/* ============================================
   天山激光 TIANSHAN LASER — 企业官网样式表
   设计风格：高级灰渐变、沉稳专业、现代工业感
   主色调：深灰 (#2d3436) + 中灰 (#636e72) + 浅灰 (#b2bec3) + 橙金点缀 (#e17055)
   ============================================ */

/* === Reset & Base === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2d3436;
    --primary-dark: #1e272e;
    --primary-light: #636e72;
    --primary-50: #f5f6fa;
    --primary-100: #dfe6e9;
    --primary-200: #b2bec3;
    --accent: #e17055;
    --accent-light: #fab1a0;
    --accent-dark: #d35400;
    --text: #2d3436;
    --text-secondary: #636e72;
    --text-light: #b2bec3;
    --bg: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #1e272e;
    --border: #dfe6e9;
    --border-light: #f0f2f5;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 8px rgba(0,0,0,0.07);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 25px 50px rgba(0,0,0,0.18);
    --shadow-accent: 0 8px 30px rgba(225,112,85,0.3);
    --radius: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-light);
}

img {
    max-width: 100%;
    height: auto;
}

ul, ol {
    list-style: none;
}

/* === Layout === */
.container {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 110px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 72px;
}

.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    color: var(--primary);
    padding: 6px 22px;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    border: 1px solid var(--primary-200);
    letter-spacing: 0.5px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.8;
}

.section-cta {
    text-align: center;
    margin-top: 40px;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 600;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(45,52,54,0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    box-shadow: 0 6px 25px rgba(45,52,54,0.35);
    color: #fff;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(45,52,54,0.2);
}

.btn-white {
    background: #fff;
    color: var(--primary);
    border-color: #fff;
}

.btn-white:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-outline-white {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-white:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
    border-radius: var(--radius-lg);
}

.btn-full {
    width: 100%;
}

/* === Header === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 4px 30px rgba(0,0,0,0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
}

.logo-icon {
    font-size: 28px;
}

.logo-img {
    height: 52px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-cn {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: 2px;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.logo-en {
    font-size: 10px;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.logo-accent {
    color: var(--primary);
}

.nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Desktop (>=769px): nav is outside header, visually placed inside via fixed positioning */
@media (min-width: 769px) {
    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 72px;
        z-index: 1001;
        justify-content: center;
        padding: 0;
        pointer-events: none;
    }
    .nav > * {
        pointer-events: auto;
    }
    .nav-link.active {
        color: var(--primary);
    }
}

.nav-link {
    padding: 8px 16px;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    background: var(--primary-50);
}

.nav-link.active {
    color: var(--primary);
    background: var(--primary-50);
    font-weight: 600;
}

.header-cta {
    padding: 8px 20px;
    font-size: 14px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* === Hero === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(155deg, #1e272e 0%, #2d3436 30%, #636e72 70%, #2d3436 100%);
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 25% 30%, rgba(225,112,85,0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 75% 70%, rgba(99,110,114,0.2) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(255,255,255,0.03) 0%, transparent 60%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 80px 80px;
    animation: gridPulse 8s ease-in-out infinite;
}

@keyframes gridPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* === Hero Slider (Banner轮播) === */
.hero-slider {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

.hero-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-slide-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(30,39,46,0.45) 0%,
        rgba(45,52,54,0.65) 50%,
        rgba(30,39,46,0.80) 100%
    );
}

.hero-slider-dots {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    gap: 10px;
}

.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid rgba(255,255,255,0.6);
}

.hero-dot.active {
    background: #fff;
    transform: scale(1.2);
    border-color: #fff;
}

.hero-dot:hover {
    background: rgba(255,255,255,0.8);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
    padding: 40px 24px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 24px;
    border-radius: 30px;
    font-size: 15px;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
    color: rgba(255,255,255,0.9);
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 24px;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

.hero-highlight {
    background: linear-gradient(135deg, #e17055, #fab1a0, #e17055);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 20px;
    color: rgba(255,255,255,0.85);
    line-height: 1.9;
    margin-bottom: 40px;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
    position: relative;
    padding: 0 24px;
}

.hero-stat:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -24px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.15);
}

.stat-number {
    display: block;
    font-size: 42px;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
}

.stat-plus, .stat-percent {
    font-size: 26px;
    color: var(--accent-light);
}

.stat-label {
    display: block;
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    margin-top: 4px;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 13px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid rgba(255,255,255,0.4);
    border-bottom: 2px solid rgba(255,255,255,0.4);
    transform: rotate(45deg);
    margin: 8px auto 0;
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
    40% { transform: rotate(45deg) translateY(8px); }
    60% { transform: rotate(45deg) translateY(4px); }
}

/* === Advantages === */
.advantages {
    background: linear-gradient(180deg, #f0f2f5 0%, var(--bg-secondary) 100%);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 36px;
}

.advantage-card {
    background: #fff;
    padding: 40px 32px;
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.advantage-card:hover::before {
    opacity: 1;
}

.advantage-icon {
    font-size: 44px;
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* === Products Preview === */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
}

.product-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-card:hover::after {
    transform: scaleX(1);
}

.product-img {
    position: relative;
    overflow: hidden;
}

.product-img-placeholder {
    width: 100%;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-img-placeholder.large {
    height: 320px;
}

.product-img-placeholder svg {
    opacity: 0.9;
}

.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
}

.product-badge.hot {
    background: linear-gradient(135deg, #ef4444, #f97316);
}

.product-badge.new {
    background: linear-gradient(135deg, #2563eb, #06b6d4);
}

.product-info {
    padding: 28px;
}

.product-info h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: #1e272e;
}

.product-info p {
    font-size: 15px;
    color: #4a5568;
    line-height: 1.8;
    margin-bottom: 16px;
}

.product-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.product-specs span {
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 12px;
    color: #4a5568;
    border: 1px solid var(--border);
}

.product-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.product-link:hover {
    color: var(--accent);
    gap: 8px;
}

/* === Applications === */
.applications {
    background: var(--bg-secondary);
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.app-item {
    background: #fff;
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.app-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    transform: scaleX(0);
    transition: transform 0.35s ease;
}

.app-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.app-item:hover::before {
    transform: scaleX(1);
}

.app-icon {
    font-size: 36px;
    margin-bottom: 14px;
}

.app-item h4 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary-dark);
}

.app-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === Cases / Testimonials === */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 36px;
}

.case-card {
    background: #fff;
    padding: 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
}

.case-card::before {
    content: '"';
    position: absolute;
    top: 16px;
    right: 24px;
    font-size: 72px;
    font-weight: 800;
    color: var(--primary-100);
    line-height: 1;
    font-family: Georgia, serif;
}

.case-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.case-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
}

.case-avatar {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(15,76,129,0.25);
}

.case-header h4 {
    font-size: 15px;
    font-weight: 600;
}

.case-header span {
    font-size: 13px;
    color: var(--text-light);
}

.case-stars {
    color: var(--accent);
    font-size: 14px;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.case-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
    font-style: italic;
}

.case-result {
    display: flex;
    gap: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.case-result span {
    font-size: 13px;
    color: var(--text-secondary);
}

.case-result strong {
    color: var(--accent-dark);
    font-size: 16px;
}

/* === CTA Section === */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-light));
    padding: 110px 0;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(225,112,85,0.1) 0%, transparent 60%);
}

.cta-section h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
    position: relative;
}

.cta-section p {
    font-size: 17px;
    color: rgba(255,255,255,0.8);
    margin-bottom: 36px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.cta-actions {
    position: relative;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* === Page Banner === */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    padding: 160px 0 80px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
}

.page-banner h1 {
    font-size: 48px;
    font-weight: 700;
    position: relative;
    margin-bottom: 16px;
    color: #fff;
}

.breadcrumb {
    position: relative;
    font-size: 14px;
    color: rgba(255,255,255,0.7);
}

.breadcrumb a {
    color: rgba(255,255,255,0.7);
}

.breadcrumb a:hover {
    color: var(--primary);
}

.breadcrumb span {
    margin: 0 8px;
}

/* === About Page === */
.about-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: start;
}

.about-text .section-tag {
    margin-bottom: 12px;
}

.about-text h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.about-lead {
    font-size: 17px;
    color: var(--text);
    font-weight: 500;
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 14px;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 28px;
}

.highlight {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-light);
}

.highlight-number {
    display: block;
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.highlight-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.about-image {
    position: sticky;
    top: 100px;
}

.about-img-placeholder {
    background: linear-gradient(135deg, var(--bg-secondary), var(--primary-50));
    border-radius: var(--radius-xl);
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 360px;
    border: 2px dashed var(--border);
}

.about-img-placeholder p {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-light);
}

/* === 公司实景图网格 === */
.about-text-full {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-text-full .about-lead {
    font-size: 17px;
    color: var(--text);
    font-weight: 500;
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text-full .about-highlights {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.about-photos-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.about-photo-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4 / 3;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.about-photo-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.about-photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.about-photo-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.6));
    color: #fff;
    padding: 20px 12px 10px;
    font-size: 13px;
    text-align: center;
}

/* === Vision === */
.vision-section {
    background: var(--bg-secondary);
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.vision-card {
    background: #fff;
    padding: 36px 28px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.vision-card::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.vision-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.vision-card:hover::before {
    transform: scaleX(1);
}

.vision-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.vision-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.vision-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* === Timeline === */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--primary-200), var(--primary-100));
}

.timeline-item {
    position: relative;
    margin-bottom: 36px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -33px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid #fff;
    box-shadow: 0 0 0 3px var(--primary-100);
}

.timeline-year {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-content h4 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === Certs === */
.certs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.cert-item {
    background: var(--bg-secondary);
    padding: 28px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.cert-item:hover {
    border-color: var(--primary-100);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.cert-icon {
    font-size: 40px;
    margin-bottom: 14px;
}

.cert-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--primary-dark);
}

.cert-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* === Product Nav === */
.product-nav {
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 72px;
    z-index: 100;
}

.product-nav-inner {
    display: flex;
    gap: 8px;
    padding: 16px 0;
    overflow-x: auto;
}

.product-nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    white-space: nowrap;
    transition: var(--transition);
}

.product-nav-item:hover,
.product-nav-item.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* === Product Detail === */
.product-detail {
    padding: 80px 0;
}

.product-detail-alt {
    background: var(--bg-secondary);
}

.product-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 60px;
}

.product-showcase.reverse .product-showcase-img {
    order: 2;
}

.product-showcase.reverse .product-showcase-info {
    order: 1;
}

.product-showcase-info h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-badge {
    display: inline-block;
    padding: 3px 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.product-models {
    font-size: 14px;
    color: var(--primary-light);
    font-weight: 500;
    margin-bottom: 12px;
    padding: 6px 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    display: inline-block;
    border-left: 3px solid var(--accent);
}

.product-specs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.spec-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.spec-label {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.spec-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
}

.product-showcase-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.product-features {
    margin-bottom: 24px;
}

.product-features li {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 2;
    padding-left: 4px;
}

.product-showcase-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* === Product Table === */
.product-table-wrap {
    margin-top: 40px;
}

.product-table-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    text-align: center;
}

.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.product-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 700px;
}

.product-table th {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    padding: 14px 16px;
    text-align: center;
    font-weight: 600;
    white-space: nowrap;
}

.product-table td {
    padding: 12px 16px;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
}

.product-table tr:nth-child(even) {
    background: var(--bg-secondary);
}

.product-table tr:hover td {
    background: var(--primary-50);
}

.product-table td:first-child {
    font-weight: 600;
    text-align: left;
    background: var(--bg-secondary);
    color: var(--text);
}

/* === Consumables === */
.consumables-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.consumable-card {
    background: #fff;
    padding: 28px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.consumable-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.consumable-icon {
    font-size: 40px;
    margin-bottom: 14px;
}

.consumable-card h4 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
}

.consumable-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === Guarantee === */
.product-advantages-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-light));
    color: #fff;
    position: relative;
    overflow: hidden;
}

.product-advantages-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 70% 50%, rgba(225,112,85,0.08) 0%, transparent 60%);
}

.product-advantages-section .section-tag {
    background: rgba(255,255,255,0.12);
    color: var(--accent-light);
    border-color: rgba(255,255,255,0.2);
}

.product-advantages-section .section-title {
    color: #fff;
}

.guarantee-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.guarantee-card {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    padding: 28px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    position: relative;
}

.guarantee-card:hover {
    background: rgba(255,255,255,0.18);
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    transform: translateY(-4px);
}

.guarantee-num {
    font-size: 32px;
    font-weight: 800;
    color: var(--accent-light);
    margin-bottom: 12px;
}

.guarantee-card h4 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #fff;
}

.guarantee-card p {
    font-size: 14px;
    color: rgba(255,255,255,0.75);
    line-height: 1.7;
}

/* === Solutions === */
.solution-process {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.process-step {
    text-align: center;
    max-width: 200px;
    padding: 24px 20px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.process-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.step-num {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.step-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.process-step h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.process-step p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.process-arrow {
    font-size: 24px;
    color: var(--primary-light);
    padding-top: 40px;
    font-weight: 300;
}

.solution-case {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid var(--border-light);
}

.solution-case:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.solution-case.reverse {
    direction: rtl;
}

.solution-case.reverse > * {
    direction: ltr;
}

.solution-img-placeholder {
    border-radius: var(--radius-xl);
    padding: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 240px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--primary-50));
}

.solution-case-img {
    border-radius: var(--radius-xl);
    min-height: 240px;
    overflow: hidden;
}

.solution-tag {
    display: inline-block;
    background: var(--primary-50);
    color: var(--primary);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
}

.solution-case-info h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.solution-case-info > p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.solution-results {
    display: flex;
    gap: 28px;
    margin-bottom: 20px;
}

.result-item {
    text-align: center;
}

.result-value {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--accent-dark);
}

.result-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.solution-equipment {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary);
}

/* === News === */
.news-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.news-tab {
    padding: 8px 24px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.news-tab:hover,
.news-tab.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.news-card {
    background: #fff;
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news-img {
    position: relative;
    overflow: hidden;
}

.news-img-placeholder {
    width: 100%;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-category {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
}

.news-category.company {
    background: var(--primary);
}

.news-category.industry {
    background: #059669;
}

.news-category.tech {
    background: #7c3aed;
}

.news-info {
    padding: 20px 24px;
}

.news-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 10px;
}

.news-info h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.5;
}

.news-info h3 a {
    color: var(--text);
}

.news-info h3 a:hover {
    color: var(--primary);
}

.news-info p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-more {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.pagination {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 48px;
}

.page-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.page-btn:hover,
.page-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* === Contact === */
.contact-quick {
    background: var(--bg-secondary);
    padding: 60px 0;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.quick-item {
    background: #fff;
    padding: 28px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.quick-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.quick-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.quick-item h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.quick-value {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 6px;
}

.quick-value:hover {
    color: var(--primary-light);
}

.quick-item p {
    font-size: 13px;
    color: var(--text-light);
}

.contact-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
}

.contact-form-wrap h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 10px;
}

.form-desc {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.contact-form {
    margin-bottom: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: var(--font);
    color: var(--text);
    background: #fff;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.checkbox-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.form-note {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 12px;
    text-align: center;
}

.form-success {
    text-align: center;
    padding: 48px 24px;
    background: var(--primary-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--primary-100);
}

.success-icon {
    font-size: 56px;
    margin-bottom: 16px;
}

.form-success h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.form-success p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Map */
.contact-map-wrap h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 20px;
}

.map-placeholder {
    background: linear-gradient(135deg, var(--bg-secondary), var(--primary-50));
    border-radius: var(--radius-xl);
    padding: 32px;
    border: 2px dashed var(--border);
    margin-bottom: 28px;
}

.map-content {
    text-align: center;
}

.map-pin {
    font-size: 48px;
    margin-bottom: 12px;
}

.map-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.map-directions {
    margin-top: 16px;
    padding: 16px;
    background: #fff;
    border-radius: var(--radius);
    text-align: left;
    border: 1px solid var(--border);
}

.map-directions p {
    font-size: 13px;
    margin-bottom: 6px;
}

.map-btn {
    margin-top: 16px;
}

/* 联系我们 - 电话展示区 */
.contact-phones {
    background: var(--bg-secondary, #f8f9fa);
    border-radius: var(--radius-lg, 12px);
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border, #e9ecef);
}

.contact-phones h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary, #333);
}

.phone-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.phone-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: #fff;
    border-radius: var(--radius, 8px);
    border: 1px solid var(--border-light, #e9ecef);
    transition: all 0.3s ease;
}

.phone-item:hover {
    border-color: var(--primary, #0066cc);
    box-shadow: 0 2px 8px rgba(0,102,204,0.1);
}

.phone-label {
    font-size: 14px;
    color: var(--text-secondary, #666);
    font-weight: 500;
}

.phone-number {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary, #0066cc);
    text-decoration: none;
    transition: color 0.3s ease;
}

.phone-numbers {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.phone-number:hover {
    color: var(--primary-dark, #004499);
    text-decoration: underline;
}

.contact-extra h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.contact-extra p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.service-network {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-network span {
    padding: 4px 14px;
    background: var(--bg-secondary);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

/* === FAQ === */
.faq-section {
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: #fff;
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    cursor: pointer;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--primary-50);
}

.faq-question h4 {
    font-size: 16px;
    font-weight: 600;
    flex: 1;
}

.faq-toggle {
    font-size: 24px;
    color: var(--primary);
    font-weight: 300;
    transition: var(--transition);
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== FAQ 独立页面 ==================== */
.faq-page { background: var(--bg-secondary, #f8f9fa); }

.faq-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
    justify-content: center;
}

.faq-cat-btn {
    padding: 8px 20px;
    border-radius: 24px;
    border: 1px solid var(--border, #dee2e6);
    background: #fff;
    color: var(--text-secondary, #666);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.faq-cat-btn:hover, .faq-cat-btn.active {
    background: var(--primary, #0066cc);
    color: #fff;
    border-color: var(--primary, #0066cc);
}

.faq-page-list { max-width: 860px; margin: 0 auto 40px; }

.faq-page-list .faq-item {
    background: #fff;
    border-radius: 12px;
    margin-bottom: 12px;
    border: 1px solid var(--border-light, #e9ecef);
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}

.faq-page-list .faq-item:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); }

.faq-page-list .faq-question {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    cursor: pointer;
    user-select: none;
}

.faq-q-icon {
    width: 28px; height: 28px;
    background: var(--primary, #0066cc);
    color: #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 700;
    flex-shrink: 0;
}

.faq-q-icon-img {
    width: 36px; height: 36px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--border-light, #eee);
}

.faq-q-text { flex: 1; font-weight: 600; font-size: 15px; color: var(--text-primary, #333); }

.faq-arrow {
    color: var(--text-secondary, #999);
    font-size: 12px;
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.open .faq-arrow { transform: rotate(180deg); }

.faq-answer {
    display: none;
    padding: 0 20px 20px;
    gap: 12px;
    align-items: flex-start;
}

.faq-item.open .faq-answer { display: flex; }

.faq-a-icon {
    width: 28px; height: 28px;
    background: #f0f4f8;
    color: var(--primary, #0066cc);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 700;
    flex-shrink: 0;
}

.faq-a-text { font-size: 14px; line-height: 1.8; color: var(--text-secondary, #555); }

.faq-contact-cta {
    text-align: center;
    padding: 40px;
    background: #fff;
    border-radius: 16px;
    max-width: 860px;
    margin: 0 auto;
    border: 1px solid var(--border-light, #e9ecef);
}

.faq-contact-cta h3 { font-size: 22px; margin-bottom: 8px; }
.faq-contact-cta p { color: var(--text-secondary, #666); margin-bottom: 20px; }

.faq-cta-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ==================== 知识库列表页 ==================== */
.knowledge-page { background: var(--bg-secondary, #f8f9fa); }

.knowledge-cats {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 32px;
    justify-content: center;
}

.know-cat-btn {
    padding: 8px 20px;
    border-radius: 24px;
    border: 1px solid var(--border, #dee2e6);
    background: #fff;
    color: var(--text-secondary, #666);
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.know-cat-btn:hover, .know-cat-btn.active {
    background: var(--primary, #0066cc);
    color: #fff;
    border-color: var(--primary, #0066cc);
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.knowledge-card {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    border: 1px solid var(--border-light, #e9ecef);
    transition: all 0.3s ease;
    display: block;
}

.knowledge-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    border-color: var(--primary, #0066cc);
}

.know-card-img {
    width: calc(100% + 48px);
    height: 180px;
    margin: -24px -24px 16px -24px;
    overflow: hidden;
}
.know-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}
.knowledge-card:hover .know-card-img img {
    transform: scale(1.05);
}

.know-card-cat {
    display: inline-block;
    padding: 3px 12px;
    background: var(--primary-light, #e8f0fe);
    color: var(--primary, #0066cc);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.know-card-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary, #333);
    margin-bottom: 10px;
    line-height: 1.5;
}

.know-card-summary {
    font-size: 13px;
    color: var(--text-secondary, #666);
    line-height: 1.7;
    margin-bottom: 16px;
}

.know-card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-tertiary, #999);
    border-top: 1px solid var(--border-light, #f0f0f0);
    padding-top: 12px;
}

/* ==================== 知识库详情页 ==================== */
.knowledge-detail { background: var(--bg-secondary, #f8f9fa); }

.knowledge-detail-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 32px;
    align-items: flex-start;
}

.knowledge-article {
    background: #fff;
    border-radius: 16px;
    padding: 40px;
    border: 1px solid var(--border-light, #e9ecef);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-light, #e9ecef);
    font-size: 13px;
    color: var(--text-secondary, #666);
}

.art-cat {
    background: var(--primary, #0066cc);
    color: #fff;
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.article-summary {
    background: var(--bg-secondary, #f8f9fa);
    border-left: 4px solid var(--primary, #0066cc);
    padding: 16px 20px;
    border-radius: 0 8px 8px 0;
    font-size: 15px;
    color: var(--text-secondary, #555);
    line-height: 1.8;
    margin-bottom: 32px;
}

.article-body {
    font-size: 15px;
    line-height: 1.9;
    color: var(--text-primary, #333);
    margin-bottom: 40px;
}

.article-body h2 { font-size: 20px; margin: 28px 0 12px; padding-bottom: 8px; border-bottom: 2px solid var(--primary, #0066cc); color: var(--primary, #0066cc); }
.article-body h3 { font-size: 17px; margin: 24px 0 10px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.article-body th { background: var(--primary, #0066cc); color: #fff; padding: 10px 14px; text-align: left; }
.article-body td { padding: 10px 14px; border-bottom: 1px solid var(--border-light, #e9ecef); }
.article-body tr:nth-child(even) td { background: var(--bg-secondary, #f8f9fa); }
.article-body li { margin: 6px 0 6px 20px; line-height: 1.8; }
.article-body img { max-width: 100%; border-radius: 8px; margin: 12px 0; }
.article-body p { margin: 8px 0; }

.article-cta {
    background: linear-gradient(135deg, #0a1628 0%, #1a3a5c 100%);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    color: #fff;
}

.article-cta h3 { font-size: 20px; margin-bottom: 8px; }
.article-cta p { color: rgba(255,255,255,0.75); margin-bottom: 20px; }
.article-cta-btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* 侧边栏 */
.knowledge-sidebar { position: sticky; top: 100px; }

.sidebar-block {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border-light, #e9ecef);
}

.sidebar-block h4 { font-size: 15px; font-weight: 700; margin-bottom: 14px; color: var(--text-primary, #333); }

.sidebar-art-item {
    display: block;
    text-decoration: none;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light, #f0f0f0);
    transition: color 0.2s;
}

.sidebar-art-item:last-child { border-bottom: none; }
.sidebar-art-item:hover .sidebar-art-title { color: var(--primary, #0066cc); }

.sidebar-art-title { display: block; font-size: 14px; font-weight: 600; color: var(--text-primary, #333); margin-bottom: 4px; }
.sidebar-art-summary { display: block; font-size: 12px; color: var(--text-secondary, #666); }

.sidebar-contact { text-align: center; }
.sidebar-contact p { font-size: 13px; color: var(--text-secondary, #666); margin-bottom: 12px; }

.sidebar-phone {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary, #0066cc);
    text-decoration: none;
    margin-bottom: 6px;
}

.sidebar-phone:hover { text-decoration: underline; }

@media (max-width: 900px) {
    .knowledge-detail-layout { grid-template-columns: 1fr; }
    .knowledge-sidebar { position: static; }
    .knowledge-article { padding: 24px; }
    .knowledge-grid { grid-template-columns: 1fr; }
}

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary, #666);
}

/* === Footer === */
.footer {
    background: linear-gradient(135deg, #1e272e 0%, #2d3436 50%, #636e72 100%);
    color: rgba(255,255,255,0.8);
    padding: 60px 0 0;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 0.8fr 0.8fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.12);
}

.footer-about .logo {
    margin-bottom: 16px;
}

.footer-about .logo-cn {
    color: #fff;
}

.footer-about .logo-en {
    color: var(--accent-light);
}

.footer-about p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 16px;
}

.footer-cert {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-cert span {
    padding: 4px 12px;
    background: rgba(255,255,255,0.1);
    border-radius: 20px;
    font-size: 12px;
    color: rgba(255,255,255,0.7);
}

.footer-links h4,
.footer-contact h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
}

.footer-links a:hover {
    color: #fff;
}

.footer-contact li {
    font-size: 14px;
    margin-bottom: 10px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-contact a {
    color: rgba(255,255,255,0.6);
}

.footer-contact a:hover {
    color: #fff;
}

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.5);
}

.footer-bottom a {
    color: rgba(255,255,255,0.5);
}

.footer-bottom a:hover {
    color: rgba(255,255,255,0.8);
}

/* === Back to Top === */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-image {
        position: static;
    }

    .about-text-full {
        text-align: left;
    }

    .about-text-full .about-highlights {
        justify-content: flex-start;
        gap: 24px;
    }

    .about-photos-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .vision-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .product-showcase {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .product-showcase.reverse .product-showcase-img {
        order: 0;
    }

    .product-showcase.reverse .product-showcase-info {
        order: 0;
    }

    .solution-case {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .solution-case.reverse {
        direction: ltr;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .section-title {
        font-size: 30px;
    }

    .product-specs-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .product-models {
        font-size: 13px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 17px;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 32px;
    }

    /* Mobile Nav */
    .nav {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        overflow-y: auto;
        z-index: 998;
    }

    .nav.active {
        display: flex;
    }

    .nav-link {
        padding: 14px 16px;
        font-size: 16px;
        border-radius: var(--radius);
    }

    .header-cta {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .advantages-grid,
    .app-grid,
    .vision-grid,
    .certs-grid,
    .consumables-grid,
    .guarantee-grid {
        grid-template-columns: 1fr;
    }

    .products-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

    .page-banner h1 {
        font-size: 30px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 300px;
    }

    .solution-process {
        flex-direction: column;
        align-items: center;
    }

    .process-arrow {
        transform: rotate(90deg);
        padding: 0;
    }

    .process-step {
        max-width: 100%;
    }

    .solution-results {
        flex-direction: column;
        gap: 16px;
    }

    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .cta-section h2 {
        font-size: 26px;
    }

    .cta-actions {
        flex-direction: column;
        align-items: center;
    }

    .cta-actions .btn {
        width: 100%;
        max-width: 320px;
    }

    .about-highlights {
        grid-template-columns: repeat(2, 1fr);
    }

    .checkbox-group {
        flex-direction: column;
        gap: 10px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }

    .flow-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 30px;
    }

    .section-title {
        font-size: 26px;
    }

    .quick-grid {
        grid-template-columns: 1fr;
    }

    .about-highlights {
        grid-template-columns: 1fr;
    }

    .flow-grid {
        grid-template-columns: 1fr !important;
    }

    .product-table {
        font-size: 12px;
    }
}

/* === Flow Grid (Solutions) === */
.flow-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.flow-card {
    background: #fff;
    padding: 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.flow-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: transform 0.35s ease;
}

.flow-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.flow-card:hover::before {
    transform: scaleX(1);
}

.flow-num {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 32px;
    font-weight: 800;
    color: var(--primary-100);
    line-height: 1;
    opacity: 0.6;
}

.flow-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.flow-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.flow-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === Utility === */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

/* === Service Flow Section === */
.service-flow-section {
    background: var(--bg-secondary);
}

/* === Help & Service Section (首页帮助与服务) === */
.help-service-section {
    background: var(--bg-secondary);
}

/* ============================================================
   新增样式：LOGO中文字样 / 优势2列卡片 / 行业背景图 / 产品详情页
   ============================================================ */

/* === 优势区 2列大卡片 === */
.advantages-grid-2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.advantage-card-2col {
    display: flex;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: #fff;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    min-height: 280px;
}

.advantage-card-2col:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.adv-img-wrap {
    width: 260px;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #2d3436, #636e72);
}

.adv-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.advantage-card-2col:hover .adv-img-wrap img {
    transform: scale(1.06);
}

.adv-img-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(30,39,46,0) 60%, rgba(30,39,46,0.15) 100%);
}

.adv-img-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
}

.adv-placeholder-icon {
    font-size: 64px;
    opacity: 0.7;
}

.adv-content {
    flex: 1;
    padding: 40px 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.adv-icon-num {
    font-size: 48px;
    font-weight: 900;
    color: var(--primary-100);
    line-height: 1;
    margin-bottom: 16px;
    font-variant-numeric: tabular-nums;
}

.adv-content h3 {
    font-size: 26px;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.adv-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.adv-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent);
    transition: var(--transition);
}

.adv-link:hover {
    gap: 12px;
    color: var(--accent-dark);
}

/* === 行业应用 背景图版 === */
.app-grid-new {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.app-item-new {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    min-height: 260px;
    display: flex;
    align-items: flex-end;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.app-item-new:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.app-bg-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.app-item-new:hover .app-bg-img {
    transform: scale(1.08);
}

.app-bg-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(30,39,46,0.1) 0%,
        rgba(30,39,46,0.75) 100%
    );
}

.app-item-content {
    position: relative;
    z-index: 1;
    padding: 28px 28px 24px;
    width: 100%;
    color: #fff;
}

.app-icon-new {
    font-size: 36px;
    margin-bottom: 10px;
    display: block;
}

.app-item-content h4 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
    color: #fff;
    letter-spacing: 0.5px;
}

.app-item-content p {
    font-size: 13px;
    color: rgba(255,255,255,0.82);
    margin-bottom: 12px;
    line-height: 1.6;
}

.app-more {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    font-weight: 600;
    color: rgba(255,255,255,0.9);
    border-bottom: 1px solid rgba(255,255,255,0.4);
    padding-bottom: 2px;
    transition: var(--transition);
}

.app-item-new:hover .app-more {
    gap: 10px;
    color: #fff;
    border-color: rgba(255,255,255,0.8);
}

/* 无背景图版：纯色样式 */
.app-item-new:not(.has-bg) .app-item-content h4 {
    color: #fff;
}

/* === 产品列表页卡片（新） === */
.products-grid-full {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card-full {
    background: #fff;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.product-card-full:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    color: inherit;
}

.product-card-img {
    position: relative;
    height: 280px;
    overflow: hidden;
    background: var(--bg-secondary);
}

.product-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card-full:hover .product-card-img img {
    transform: scale(1.05);
}

.product-card-body {
    padding: 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.product-card-body h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.product-models-sm {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.product-card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
    flex: 1;
}

.product-specs-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.product-specs-row span {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.product-card-footer {
    border-top: 1px solid var(--border-light);
    padding-top: 16px;
}

.product-detail-btn {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent);
    transition: var(--transition);
}

.product-card-full:hover .product-detail-btn {
    letter-spacing: 1px;
}

/* === 产品详情页 === */
.pd-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: flex-start;
}

.pd-gallery {
    position: sticky;
    top: 100px;
}

.pd-main-img-wrap {
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--bg-secondary);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pd-main-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}

.pd-img-empty {
    background: var(--bg-secondary);
}

.pd-thumbs {
    display: flex;
    gap: 10px;
    margin-top: 14px;
    flex-wrap: wrap;
}

.pd-thumb {
    width: 80px;
    height: 60px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    flex-shrink: 0;
}

.pd-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pd-thumb.active,
.pd-thumb:hover {
    border-color: var(--accent);
}

.pd-img-caption {
    margin-top: 14px;
    padding: 14px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--text-secondary);
    min-height: 40px;
}

.pd-img-caption strong {
    display: block;
    font-size: 14px;
    color: var(--primary);
    margin-bottom: 4px;
}

.pd-info {
    padding-top: 8px;
}

.pd-name {
    font-size: 34px;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 10px;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

.pd-models {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    padding: 8px 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    display: inline-block;
}

.pd-specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.pd-spec {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 14px 16px;
    border: 1px solid var(--border-light);
}

.pd-spec-label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.pd-spec-val {
    font-size: 15px;
    font-weight: 700;
    color: var(--primary-dark);
}

.pd-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 24px;
}

.pd-features {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 28px;
}

.pd-features li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 14px;
    color: var(--text);
}

.pd-feat-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    margin-top: 6px;
}

.pd-actions {
    display: flex;
    gap: 14px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.pd-tips {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 14px 0;
    border-top: 1px solid var(--border-light);
}

/* 产品多图网格 */
.pd-gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.pd-gallery-item {
    background: #fff;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.pd-gallery-img {
    height: 280px;
    overflow: hidden;
}

.pd-gallery-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.pd-gallery-item:hover .pd-gallery-img img {
    transform: scale(1.04);
}

.pd-gallery-text {
    padding: 24px;
}

.pd-gallery-text h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.pd-gallery-text p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 核心特性网格 */
.pd-feat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.pd-feat-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.pd-feat-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
    transform: translateY(-3px);
}

.pd-feat-num {
    font-size: 40px;
    font-weight: 900;
    color: var(--primary-100);
    line-height: 1;
    margin-bottom: 12px;
}

.pd-feat-card p {
    font-size: 15px;
    color: var(--text);
    line-height: 1.7;
    font-weight: 500;
}

/* === 产品核心特性亮点（图片背景卡片）=== */
.pd-hl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.pd-hl-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 3 / 2;
    cursor: pointer;
    transition: var(--transition);
}
.pd-hl-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.pd-hl-card.expanded {
    box-shadow: 0 0 0 3px var(--primary), var(--shadow-md);
}
.pd-hl-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.pd-hl-card:hover .pd-hl-bg {
    transform: scale(1.05);
}
.pd-hl-bg-fallback {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}
.pd-hl-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.72) 0%, rgba(0,0,0,0.25) 60%, rgba(0,0,0,0.05) 100%);
}
.pd-hl-content {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 20px;
    color: #fff;
    z-index: 2;
}
.pd-hl-num {
    font-size: 28px;
    font-weight: 900;
    color: var(--accent-light);
    line-height: 1;
    margin-bottom: 6px;
    opacity: 0.85;
}
.pd-hl-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 4px;
}
.pd-hl-desc {
    font-size: 13px;
    color: rgba(255,255,255,0.8);
    line-height: 1.5;
    margin: 0;
}
.pd-hl-more {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: rgba(255,255,255,0.7);
    margin-top: 8px;
    transition: color 0.2s;
}
.pd-hl-card:hover .pd-hl-more {
    color: #fff;
}

/* 亮点展开详情 — 大气排版 */
.pd-hl-detail {
    grid-column: 1 / -1;
}
.pd-hl-detail-inner {
    position: relative;
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.04);
    overflow: hidden;
    animation: hlSlideIn 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes hlSlideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
/* 顶部装饰渐变条 */
.pd-hl-detail-inner::before {
    content: '';
    display: block;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 50%, var(--primary-light) 100%);
}

.pd-hl-detail-body {
    display: flex;
    gap: 0;
    align-items: stretch;
}

.pd-hl-detail-img {
    flex: 0 0 480px;
    overflow: hidden;
    background: linear-gradient(135deg, #f0f4f8 0%, #e2e8f0 100%);
}
.pd-hl-detail-img img {
    width: 100%;
    height: 100%;
    min-height: 360px;
    object-fit: cover;
    display: block;
}
.pd-hl-detail-noimg {
    width: 100%;
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pd-hl-detail-text {
    flex: 1;
    padding: 48px 48px 40px;
    display: flex;
    flex-direction: column;
}

.pd-hl-detail-header {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-light, #e9ecef);
}
.pd-hl-detail-num {
    font-size: 56px;
    font-weight: 900;
    color: var(--primary);
    opacity: 0.15;
    line-height: 1;
    flex-shrink: 0;
}
.pd-hl-detail-header h3 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.3;
    padding-bottom: 4px;
}

/* 核心描述区 — 保留用户输入格式 */
.pd-hl-detail-desc {
    font-size: 16px;
    color: #374151;
    line-height: 2;
    white-space: pre-line;
    word-break: break-word;
    flex: 1;
}

.pd-hl-detail-empty {
    color: #9ca3af;
    font-size: 15px;
    text-align: center;
    padding: 40px 0;
}

/* 底部行动区 */
.pd-hl-detail-action {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-light, #e9ecef);
}
.pd-hl-detail-action .btn {
    font-size: 15px;
    padding: 12px 32px;
}

/* 关闭按钮 */
.pd-hl-close {
    position: absolute;
    top: 16px;
    right: 16px;
    z-index: 5;
    background: rgba(0,0,0,0.05);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #666;
    transition: all 0.2s;
}
.pd-hl-close:hover {
    background: rgba(0,0,0,0.1);
    color: #333;
    transform: rotate(90deg);
}

@media (max-width: 900px) {
    .pd-hl-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 768px) {
    .pd-hl-grid {
        grid-template-columns: 1fr;
    }
    .pd-hl-detail-body {
        flex-direction: column;
    }
    .pd-hl-detail-img {
        flex: none;
        width: 100%;
    }
    .pd-hl-detail-img img {
        height: 240px;
        min-height: auto;
    }
    .pd-hl-detail-noimg {
        min-height: 200px;
    }
    .pd-hl-detail-text {
        padding: 32px 24px 28px;
    }
    .pd-hl-detail-header {
        gap: 14px;
        margin-bottom: 24px;
        padding-bottom: 20px;
    }
    .pd-hl-detail-num {
        font-size: 40px;
    }
    .pd-hl-detail-header h3 {
        font-size: 22px;
    }
    .pd-hl-detail-desc {
        font-size: 15px;
        line-height: 1.9;
    }
    .pd-hl-detail-action {
        margin-top: 24px;
        padding-top: 20px;
    }
}

/* === 后台设置页图片相关 === */
.img-upload-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.setting-thumb {
    width: 100px;
    height: 64px;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid #eee;
}

/* === 响应式补充 === */
@media (max-width: 1100px) {
    .advantages-grid-2col {
        grid-template-columns: 1fr;
    }
    .adv-img-wrap {
        width: 220px;
    }
    .pd-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .pd-gallery {
        position: static;
    }
    .products-grid-full {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .advantages-grid-2col {
        grid-template-columns: 1fr;
    }
    .advantage-card-2col {
        flex-direction: column;
        min-height: auto;
    }
    .adv-img-wrap {
        width: 100%;
        height: 200px;
    }
    .adv-content {
        padding: 24px;
    }
    .app-grid-new {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .pd-specs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .pd-features {
        grid-template-columns: 1fr;
    }
    .pd-gallery-grid {
        grid-template-columns: 1fr;
    }
    .pd-feat-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .products-grid-full {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .app-grid-new {
        grid-template-columns: 1fr;
    }
    .pd-feat-grid {
        grid-template-columns: 1fr;
    }
    .logo-cn {
        font-size: 18px;
    }
    .logo-en {
        font-size: 9px;
    }
    .logo-img {
        height: 40px;
    }
}

.help-service-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.help-col-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--primary-100);
}

.help-col-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-dark);
}

.help-more-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s;
}

.help-more-link:hover {
    color: var(--accent);
}

/* FAQ列表 */
.help-faq-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.help-faq-item {
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.help-faq-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    border-color: var(--primary-100);
}

.help-faq-q {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    gap: 12px;
}

.help-faq-q span {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    flex: 1;
}

.help-faq-arrow {
    font-size: 11px;
    color: var(--text-light);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.help-faq-item.open .help-faq-arrow {
    transform: rotate(180deg);
}

.help-faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    padding: 0 20px;
}

.help-faq-item.open .help-faq-a {
    max-height: 200px;
    padding: 0 20px 16px;
}

/* 知识库文章 */
.help-art-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.help-art-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 12px;
    border: 1px solid var(--border-light);
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.help-art-card:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    border-color: var(--primary-100);
}

.help-art-img {
    width: 100px;
    height: 72px;
    border-radius: var(--radius);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--bg-secondary);
}

.help-art-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.help-art-img-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.help-art-info {
    flex: 1;
    min-width: 0;
}

.help-art-cat {
    display: inline-block;
    padding: 2px 10px;
    background: var(--primary-50);
    color: var(--primary);
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 6px;
}

.help-art-info h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.help-art-info p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (max-width: 768px) {
    .help-service-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}