/* ========================================
   WCW - Shenzhen Wahchangwei Industrial Co., Ltd.
   Corporate Website Shared Stylesheet
   ======================================== */

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

:root {
    /* Colors */
    --primary: #0A4D8C;
    --primary-dark: #062E52;
    --primary-light: #1565C0;
    --primary-lighter: #E3F0FA;
    --accent: #E87830;
    --accent-dark: #C85F1A;
    --accent-light: #FFF3E8;
    --dark: #1A1A2E;
    --text: #2D2D3F;
    --text-light: #6B7280;
    --text-lighter: #9CA3AF;
    --bg-light: #F5F7FA;
    --bg-lighter: #FAFBFC;
    --white: #FFFFFF;
    --border: #E5E7EB;
    --border-light: #F0F1F3;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 16px 48px rgba(0,0,0,0.12);
    --radius: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1280px;
    --header-height: 88px;
}

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

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", "Inter", "Segoe UI", system-ui, sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    display: block;
}

ul, ol {
    list-style: none;
}

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Section ===== */
.section {
    padding: 100px 0;
}

.section-sm {
    padding: 60px 0;
}

.section-bg-light {
    background: var(--bg-light);
}

.section-bg-primary {
    background: var(--primary);
    color: var(--white);
}

.section-bg-dark {
    background: var(--dark);
    color: var(--white);
}

/* ===== Typography ===== */
.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-title.light {
    color: var(--white);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 640px;
    margin: 0 auto 60px;
    text-align: center;
}

.section-subtitle.left {
    margin-left: 0;
    text-align: left;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header .accent-line {
    width: 60px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
    margin: 20px auto 0;
}

.section-header.left {
    text-align: left;
}

.section-header.left .accent-line {
    margin-left: 0;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(232, 120, 48, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.4);
}

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

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

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

.btn-lg {
    padding: 16px 40px;
    font-size: 1.05rem;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-light);
}

.header.scrolled {
    box-shadow: var(--shadow);
}

.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
    flex-shrink: 0;
}

.logo-img {
    height: 56px;
    width: auto;
    display: block;
    border-radius: 6px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: -1px;
    flex-shrink: 0;
}

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

.logo-text .logo-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
}

.logo-text .logo-sub {
    font-size: 0.7rem;
    color: var(--text-light);
    font-weight: 400;
    letter-spacing: 0.5px;
}

.lang-switch {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px;
    background: var(--bg-light);
    border-radius: 100px;
    border: 1px solid var(--border-light);
}

.lang-switch a {
    padding: 5px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-light);
    border-radius: 100px;
    transition: var(--transition);
}

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

.lang-switch a.active {
    background: var(--primary);
    color: var(--white);
}

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

.nav a {
    padding: 8px 18px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    border-radius: var(--radius);
    position: relative;
}

.nav a:hover {
    color: var(--primary);
    background: var(--primary-lighter);
}

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

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-cta .btn {
    padding: 10px 24px;
    font-size: 0.875rem;
}

.lang-toggle {
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-light);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.lang-toggle:hover {
    color: var(--primary);
    border-color: var(--primary);
}

/* Mobile menu toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

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

.mobile-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

.mobile-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 640px;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    z-index: -2;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(232, 120, 48, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(21, 101, 192, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 60% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    position: relative;
    z-index: 1;
    color: var(--white);
    padding: 80px 0;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero-tag-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 24px;
    max-width: 720px;
}

.hero-title .accent {
    color: var(--accent);
}

.hero-desc {
    font-size: 1.2rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.85);
    max-width: 560px;
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 48px;
    margin-top: 64px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-stat {
    text-align: left;
}

.hero-stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
}

.hero-stat-num .unit {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent);
    margin-left: 4px;
}

.hero-stat-label {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    margin-top: 8px;
}

/* Page Hero (for sub pages) */
.page-hero {
    position: relative;
    padding: calc(var(--header-height) + 80px) 0 80px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
    color: var(--white);
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 80% 20%, rgba(232, 120, 48, 0.1) 0%, transparent 50%),
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.page-hero-content {
    position: relative;
    z-index: 1;
}

.page-hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.page-hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.8);
    max-width: 600px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
}

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

.breadcrumb span {
    color: rgba(255,255,255,0.4);
}

/* ===== Cards & Grid ===== */
.grid {
    display: grid;
    gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
    background: var(--primary-lighter);
    color: var(--primary);
}

.card-icon.accent {
    background: var(--accent-light);
    color: var(--accent);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
}

.card-number {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 3rem;
    font-weight: 800;
    color: var(--bg-light);
    line-height: 1;
    z-index: 0;
}

/* ===== Feature Row ===== */
.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.feature-row.reverse .feature-content {
    order: 2;
}

.feature-content h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.feature-content p {
    color: var(--text-light);
    font-size: 1.05rem;
    margin-bottom: 24px;
    line-height: 1.8;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 24px;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--text);
}

.feature-list li::before {
    content: '';
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
    margin-top: 3px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 12px;
}

.feature-visual {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    min-height: 400px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Stats Section ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

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

.stat-num {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
}

.stat-num .unit {
    font-size: 1.2rem;
    color: var(--white);
    opacity: 0.8;
}

.stat-label {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.7);
    margin-top: 12px;
}

/* ===== Product Card ===== */
.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    cursor: pointer;
}

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

.product-card-visual {
    height: 220px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.product-card-visual::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 30% 50%, rgba(232, 120, 48, 0.15) 0%, transparent 50%);
}

.product-card-visual .product-icon {
    font-size: 4rem;
    position: relative;
    z-index: 1;
}

.product-card-body {
    padding: 24px;
}

.product-card-body h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.product-card-body .product-en {
    font-size: 0.8rem;
    color: var(--text-lighter);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-card-body p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-tag {
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--primary-lighter);
    color: var(--primary);
    border-radius: 100px;
}

/* ===== Product Detail (for products page) ===== */
.product-detail {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-light);
    margin-bottom: 32px;
}

.product-detail-header {
    padding: 32px 40px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 24px;
}

.product-detail-num {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: rgba(255,255,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    flex-shrink: 0;
    backdrop-filter: blur(10px);
}

.product-detail-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.product-detail-header .product-en-name {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.7);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-detail-body {
    padding: 32px 40px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.product-image {
    width: 100%;
    height: 280px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
    border-bottom: 1px solid var(--border-light);
}

.product-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 60%, rgba(10, 77, 140, 0.04) 100%);
    pointer-events: none;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-detail:hover .product-image img {
    transform: scale(1.06);
}

.product-image-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(10, 77, 140, 0.92);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 100px;
    backdrop-filter: blur(10px);
    z-index: 1;
    letter-spacing: 0.5px;
}

.product-detail-desc {
    color: var(--text);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.product-specs {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 24px;
}

.product-specs h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.product-specs dl {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.product-specs dt {
    font-size: 0.8rem;
    color: var(--text-lighter);
    font-weight: 500;
}

.product-specs dd {
    font-size: 0.9rem;
    color: var(--dark);
    font-weight: 600;
    margin-top: 2px;
}

.product-applications {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.product-app-tag {
    padding: 6px 14px;
    font-size: 0.8rem;
    background: var(--bg-light);
    color: var(--text-light);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

/* ===== Timeline ===== */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--primary-light), var(--border));
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    padding: 0 48px 48px 0;
    text-align: right;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 48px 48px;
    text-align: left;
}

.timeline-item::after {
    content: '';
    position: absolute;
    top: 8px;
    right: -8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--white);
    border: 4px solid var(--accent);
    z-index: 1;
}

.timeline-item:nth-child(even)::after {
    right: auto;
    left: -8px;
}

.timeline-year {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.timeline-content {
    background: var(--white);
    border-radius: var(--radius);
    padding: 20px 24px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow);
    border-color: var(--primary-lighter);
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== Certification Badges ===== */
.cert-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

.cert-badge {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.cert-badge:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.cert-badge-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.1rem;
    font-weight: 700;
    flex-shrink: 0;
}

.cert-badge-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark);
    line-height: 1.3;
}

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

.app-item {
    text-align: center;
    padding: 32px 20px;
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

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

.app-item-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.app-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 4px;
}

.app-item p {
    font-size: 0.8rem;
    color: var(--text-lighter);
}

/* ===== Contact Section ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.contact-info-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--border-light);
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-light);
}

.contact-info-item:last-child {
    border-bottom: none;
}

.contact-info-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.contact-info-text h4 {
    font-size: 0.85rem;
    color: var(--text-lighter);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
    font-weight: 500;
}

.contact-info-text p {
    font-size: 1.05rem;
    color: var(--dark);
    font-weight: 600;
}

.contact-info-text a {
    color: var(--dark);
}

.contact-info-text a:hover {
    color: var(--primary);
}

/* Contact Form */
.contact-form {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid var(--border-light);
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.form-group label .required {
    color: var(--accent);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-family: inherit;
    transition: var(--transition);
    background: var(--white);
    color: var(--text);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-lighter);
}

.form-control::placeholder {
    color: var(--text-lighter);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

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

.form-success {
    display: none;
    padding: 16px 20px;
    background: #E8F5E9;
    border: 1px solid #A5D6A7;
    border-radius: var(--radius);
    color: #2E7D32;
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.form-success.show {
    display: block;
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    text-align: center;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 30% 50%, rgba(232, 120, 48, 0.1) 0%, transparent 50%),
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.cta-section .container {
    position: relative;
    z-index: 1;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.cta-section p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 32px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
    padding: 64px 0 0;
}

.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo {
    margin-bottom: 20px;
}

.footer-brand .logo .logo-name {
    color: var(--white);
}

.footer-brand .logo .logo-sub {
    color: rgba(255,255,255,0.5);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
    max-width: 320px;
}

.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col ul a {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

.footer-contact-item strong {
    color: rgba(255,255,255,0.8);
    font-weight: 600;
}

.footer-bottom {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

.footer-bottom a {
    color: rgba(255,255,255,0.4);
}

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

/* ===== Animations ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.75rem; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .app-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-main { grid-template-columns: 1fr 1fr; }
    .product-detail-body { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .nav, .header-cta { display: none; }
    .mobile-toggle { display: flex; }
    
    .nav.mobile-open {
        display: flex;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 8px;
        z-index: 999;
    }
    
    .hero { min-height: auto; }
    .hero-title { font-size: 2rem; }
    .hero-desc { font-size: 1rem; }
    .hero-stats { flex-wrap: wrap; gap: 24px; }
    .hero-stat-num { font-size: 1.75rem; }
    
    .section { padding: 60px 0; }
    .section-title { font-size: 1.75rem; }
    
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .feature-row { grid-template-columns: 1fr; gap: 32px; }
    .feature-row.reverse .feature-content { order: 0; }
    .contact-grid { grid-template-columns: 1fr; }
    
    .timeline::before { left: 20px; }
    .timeline-item { width: 100%; padding: 0 0 32px 48px; text-align: left; }
    .timeline-item:nth-child(even) { margin-left: 0; padding: 0 0 32px 48px; }
    .timeline-item::after { right: auto; left: 12px; }
    .timeline-item:nth-child(even)::after { left: 12px; }
    
    .app-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-main { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    
    .product-detail-header { flex-direction: column; text-align: center; padding: 24px; }
    .product-detail-body { padding: 24px; }
    
    .form-row { grid-template-columns: 1fr; }
    
    .cta-section h2 { font-size: 1.75rem; }
    .page-hero h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.625rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; justify-content: center; }
    .app-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; }
    .container { padding: 0 16px; }
}

/* ===== Value Props (合作价值) ===== */
.value-props {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.value-prop-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.value-prop-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}
.value-prop-num {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 16px;
    letter-spacing: 1px;
}
.value-prop-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.4;
}
.value-prop-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ===== Selection Guide (选型引导) ===== */
.selection-guide {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    color: var(--white);
    text-align: center;
    position: relative;
    overflow: hidden;
}
.selection-guide::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        radial-gradient(circle at 30% 50%, rgba(232,120,48,0.1) 0%, transparent 50%),
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}
.selection-guide > * { position: relative; z-index: 1; }
.selection-guide h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.selection-guide p {
    color: rgba(255,255,255,0.8);
    margin-bottom: 28px;
    font-size: 1rem;
}
.selection-guide .btn { margin: 0 6px; }

/* ===== Scenario Grid (场景应用) ===== */
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.scenario-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    cursor: pointer;
}
.scenario-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}
.scenario-visual {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.scenario-visual::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: radial-gradient(circle at 30% 50%, rgba(232,120,48,0.15) 0%, transparent 50%);
}
.scenario-visual svg {
    position: relative;
    z-index: 1;
    width: 56px; height: 56px;
    color: rgba(255,255,255,0.85);
}
.scenario-body {
    padding: 24px;
}
.scenario-body .scenario-tag {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}
.scenario-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}
.scenario-body p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== Industry Cases (行业应用) ===== */
.industry-case {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.industry-case:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}
.industry-case .case-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 4px;
}
.industry-case .case-icon {
    width: 48px; height: 48px;
    border-radius: 12px;
    background: var(--primary-lighter);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    flex-shrink: 0;
}
.industry-case .case-icon svg { width: 24px; height: 24px; }
.industry-case h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
}
.industry-case .case-desc {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
}
.industry-case .case-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 4px;
}
.industry-case .case-list li {
    font-size: 0.82rem;
    color: var(--text-light);
    padding-left: 16px;
    position: relative;
    line-height: 1.6;
}
.industry-case .case-list li::before {
    content: '';
    position: absolute;
    left: 0; top: 8px;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

/* Pain Points */
.pain-points {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--border-light);
}
.pain-points h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 20px;
}
.pain-points ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.pain-points li {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
    padding-left: 20px;
    position: relative;
}
.pain-points li::before {
    content: '!';
    position: absolute;
    left: 0; top: 0;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--white);
    font-size: 0.65rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Product Matrix */
.product-matrix {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.matrix-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    transition: var(--transition);
}
.matrix-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}
.matrix-item h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}
.matrix-item p {
    font-size: 0.82rem;
    color: var(--text-light);
    line-height: 1.5;
}

/* ===== Manufacturing Network (制造布局) ===== */
.manufacturing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.mfg-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.mfg-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-lighter);
}
.mfg-card .mfg-tag {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}
.mfg-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}
.mfg-card p {
    font-size: 0.88rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}
.mfg-card .mfg-addr {
    font-size: 0.82rem;
    color: var(--text-lighter);
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.mfg-card .mfg-addr::before {
    content: '\01F4CD';
    flex-shrink: 0;
}

/* Quick Contact Bar */
.quick-contact-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}
.quick-contact-bar a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}
.quick-contact-bar a.email {
    background: var(--accent-light);
    color: var(--accent-dark);
}
.quick-contact-bar a.email:hover {
    background: var(--accent);
    color: var(--white);
}
.quick-contact-bar a.whatsapp {
    background: #E8F5E9;
    color: #2E7D32;
}
.quick-contact-bar a.whatsapp:hover {
    background: #25D366;
    color: var(--white);
}

/* Hero Quick Actions */
.hero-quick-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.hero-quick-actions a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
    transition: var(--transition);
}
.hero-quick-actions a:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.4);
    transform: translateY(-2px);
}

/* Hero Quick Contact */
.hero-quick-contact {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}
.hero-quick-contact a {
    font-size: 0.88rem;
    color: rgba(255,255,255,0.8);
    transition: var(--transition);
}
.hero-quick-contact a:hover {
    color: var(--accent);
}

/* Responsive for new sections */
@media (max-width: 1024px) {
    .value-props { grid-template-columns: 1fr; }
    .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .manufacturing-grid { grid-template-columns: 1fr; }
    .product-matrix { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .value-props { grid-template-columns: 1fr; }
    .scenario-grid { grid-template-columns: 1fr; }
    .selection-guide { padding: 32px 20px; }
    .selection-guide h2 { font-size: 1.4rem; }
    .industry-case { padding: 24px; }
    .mfg-card { padding: 24px; }
}