/* ============================================
   计巡 JiXun UGV - Official Website Styles
   Brand: 计巡 | autougv.com
   ============================================ */

/* ===== CSS Variables ===== */
:root {
    --color-primary: #0A1929;
    --color-primary-light: #132f4c;
    --color-accent: #FF6B35;
    --color-accent-dark: #e55a2b;
    --color-tech: #00A8E8;
    --color-tech-dark: #0077b6;
    --color-bg: #ffffff;
    --color-bg-alt: #f4f7fa;
    --color-bg-dark: #0A1929;
    --color-text: #1a1a2e;
    --color-text-light: #5a6c7d;
    --color-text-white: #ffffff;
    --color-border: #e0e6ed;
    --color-success: #2ecc71;
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --shadow-sm: 0 2px 8px rgba(10, 25, 41, 0.08);
    --shadow-md: 0 4px 20px rgba(10, 25, 41, 0.12);
    --shadow-lg: 0 10px 40px rgba(10, 25, 41, 0.18);
    --shadow-glow: 0 0 30px rgba(0, 168, 232, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 24px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1280px;
    --header-height: 72px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; cursor: pointer; font-family: inherit; }

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

.section { padding: 100px 0; }
.section-sm { padding: 60px 0; }
.section-dark { background: var(--color-bg-dark); color: var(--color-text-white); }
.section-alt { background: var(--color-bg-alt); }

.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-tech { color: var(--color-tech); }

/* ===== Typography ===== */
h1, h2, h3, h4, h5 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 60px;
    max-width: 600px;
}

.section-dark .section-subtitle { color: rgba(255,255,255,0.65); }

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.badge-tech {
    background: rgba(0, 168, 232, 0.12);
    color: var(--color-tech);
    border: 1px solid rgba(0, 168, 232, 0.3);
}

.badge-accent {
    background: rgba(255, 107, 53, 0.12);
    color: var(--color-accent);
    border: 1px solid rgba(255, 107, 53, 0.3);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(255, 107, 53, 0.45);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-white);
    border-color: rgba(255,255,255,0.3);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: rgba(255,107,53,0.08);
}

.btn-tech {
    background: var(--color-tech);
    color: #fff;
}

.btn-tech:hover {
    background: var(--color-tech-dark);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-tech);
    border-color: var(--color-border);
}

.btn-ghost:hover {
    border-color: var(--color-tech);
    background: rgba(0,168,232,0.05);
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-height);
    background: rgba(10, 25, 41, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(10, 25, 41, 0.95);
    box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.nav {
    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: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
}

.logo-icon {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-tech));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
    box-shadow: 0 4px 15px rgba(255,107,53,0.3);
}

.logo-text { letter-spacing: 0.05em; }
.logo-text span { color: var(--color-accent); }
.logo-sub { font-size: 0.65rem; font-weight: 400; color: rgba(255,255,255,0.5); letter-spacing: 0.15em; }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-link {
    color: rgba(255,255,255,0.75);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: #fff;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -6px; left: 0; right: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 50px;
    background: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.8);
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}

.lang-toggle:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.lang-toggle .active-lang { color: var(--color-accent); }

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
}

.mobile-menu-btn span {
    width: 24px; height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--color-primary);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%; height: 100%;
    object-fit: cover;
    opacity: 0.5;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(10,25,41,0.92) 0%, rgba(10,25,41,0.6) 50%, rgba(10,25,41,0.85) 100%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0,168,232,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,168,232,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: #fff;
    max-width: 720px;
    padding-top: var(--header-height);
}

.hero-badge {
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.8rem;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, var(--color-accent), var(--color-tech));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
    line-height: 1.7;
}

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

.hero-stats {
    position: absolute;
    bottom: 40px; left: 0; right: 0;
    z-index: 2;
    padding: 0 24px;
}

.hero-stats-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 32px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius);
    backdrop-filter: blur(10px);
}

.stat-item { text-align: center; }
.stat-num {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-accent), var(--color-tech));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ===== Product Cards ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.product-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

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

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

.product-card-img img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-card-img img {
    transform: scale(1.08);
}

.product-card-img::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 60px;
    background: linear-gradient(transparent, rgba(10,25,41,0.6));
}

.product-card-tag {
    position: absolute;
    top: 16px; left: 16px;
    z-index: 2;
}

.product-card-body {
    padding: 32px;
}

.product-card-body h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.product-card-body p {
    color: var(--color-text-light);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.product-features-mini {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.feature-tag {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.78rem;
    background: var(--color-bg-alt);
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-tech);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

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

.feature-item {
    padding: 36px 28px;
    border-radius: var(--radius);
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
}

.feature-item:hover {
    background: rgba(255,255,255,0.07);
    border-color: var(--color-tech);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px; height: 56px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-accent), var(--color-tech));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: #fff;
}

.feature-item p {
    color: rgba(255,255,255,0.6);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* ===== Tech Section ===== */
.tech-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.tech-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.tech-image img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.tech-list { list-style: none; }
.tech-list li {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-start;
}

.tech-list-num {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: rgba(0,168,232,0.1);
    color: var(--color-tech);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
    border: 2px solid rgba(0,168,232,0.2);
}

.tech-list-content h4 { font-size: 1.1rem; margin-bottom: 6px; }
.tech-list-content p { color: var(--color-text-light); font-size: 0.92rem; }

/* ===== CTA Banner ===== */
.cta-banner {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-lg);
    padding: 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%; right: -20%;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(0,168,232,0.15), transparent);
    border-radius: 50%;
}

.cta-banner h2 {
    color: #fff;
    font-size: 2.2rem;
    margin-bottom: 16px;
    position: relative;
}

.cta-banner p {
    color: rgba(255,255,255,0.7);
    font-size: 1.1rem;
    margin-bottom: 32px;
    position: relative;
}

.cta-banner .btn { position: relative; }

/* ===== Product Detail Page ===== */
.page-hero {
    background: var(--color-primary);
    color: #fff;
    padding: calc(var(--header-height) + 80px) 0 80px;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,168,232,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,168,232,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
}

.page-hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-bottom: 20px;
}

.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb span { color: rgba(255,255,255,0.8); }

.page-hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.page-hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.7;
}

.product-detail-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.product-detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.product-detail-image img {
    width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
}

.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 32px;
}

.spec-table th, .spec-table td {
    padding: 14px 20px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.spec-table th {
    background: var(--color-bg-alt);
    font-weight: 600;
    color: var(--color-text);
    width: 35%;
}

.spec-table td { color: var(--color-text-light); }

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.advantage-card {
    padding: 32px 24px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.advantage-card:hover {
    border-color: var(--color-tech);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.advantage-card .icon {
    width: 48px; height: 48px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(0,168,232,0.1), rgba(255,107,53,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 16px;
}

.advantage-card h4 { font-size: 1.1rem; margin-bottom: 10px; }
.advantage-card p { color: var(--color-text-light); font-size: 0.9rem; }

/* ===== About Page ===== */
.about-hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-top: 60px;
}

.about-stat { text-align: center; }
.about-stat .num {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-accent), var(--color-tech));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.about-stat .label { color: var(--color-text-light); margin-top: 8px; }

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px; top: 0; bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: 48px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 22px; top: 4px;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 4px solid var(--color-bg);
    box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-year {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.timeline-item h4 { font-size: 1.15rem; margin-bottom: 8px; }
.timeline-item p { color: var(--color-text-light); }

/* ===== Contact Page ===== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info-card {
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 48px;
    position: relative;
    overflow: hidden;
}

.contact-info-card::before {
    content: '';
    position: absolute;
    bottom: -40%; right: -30%;
    width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(0,168,232,0.15), transparent);
    border-radius: 50%;
}

.contact-info-card h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
    position: relative;
}

.contact-info-card > p {
    color: rgba(255,255,255,0.6);
    margin-bottom: 32px;
    position: relative;
}

.contact-detail-list { position: relative; }
.contact-detail-list li {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
    align-items: flex-start;
}

.contact-detail-list .icon {
    width: 44px; height: 44px;
    border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-detail-list .label {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-detail-list .value {
    font-size: 1rem;
    color: #fff;
    font-weight: 500;
    margin-top: 2px;
}

.contact-form {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

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

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

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--color-bg-alt);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-tech);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(0,168,232,0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-message {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    display: none;
}

.form-message.success {
    display: block;
    background: rgba(46,204,113,0.1);
    color: var(--color-success);
    border: 1px solid rgba(46,204,113,0.3);
}

/* ===== Footer ===== */
.footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.6);
    padding: 80px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand h3 {
    color: #fff;
    font-size: 1.4rem;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 0.92rem;
    line-height: 1.7;
    margin-bottom: 20px;
    max-width: 320px;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 20px;
}

.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a {
    font-size: 0.92rem;
    transition: var(--transition);
}

.footer-col ul li a:hover { color: var(--color-accent); }

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.footer-bottom a:hover { color: var(--color-accent); }

.social-links {
    display: flex;
    gap: 12px;
}

.social-links a {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 0.95rem;
}

.social-links a:hover {
    background: var(--color-accent);
    color: #fff;
}

/* ===== Animations ===== */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-up:nth-child(2) { transition-delay: 0.1s; }
.fade-up:nth-child(3) { transition-delay: 0.2s; }
.fade-up:nth-child(4) { transition-delay: 0.3s; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero h1 { font-size: 2.8rem; }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-showcase { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .about-hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .product-detail-layout { grid-template-columns: 1fr; gap: 40px; }
    .contact-layout { grid-template-columns: 1fr; gap: 40px; }
    .hero-stats-inner { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: var(--header-height); left: 0; right: 0;
        background: var(--color-primary);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .nav-menu.active { display: flex; }
    .mobile-menu-btn { display: flex; }
    
    .hero h1 { font-size: 2.2rem; }
    .hero-desc { font-size: 1rem; }
    .section { padding: 60px 0; }
    .section-title { font-size: 1.8rem; }
    .products-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr; }
    .advantage-grid { grid-template-columns: 1fr; }
    .about-stats { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
    .cta-banner { padding: 40px 24px; }
    .cta-banner h2 { font-size: 1.6rem; }
    .hero-stats-inner { grid-template-columns: 1fr 1fr; gap: 16px; padding: 20px; }
    .stat-num { font-size: 1.6rem; }
    .form-row { grid-template-columns: 1fr; }
    .contact-form, .contact-info-card { padding: 32px 24px; }
    .page-hero h1 { font-size: 2rem; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; justify-content: center; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-alt); }
::-webkit-scrollbar-thumb { background: var(--color-text-light); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text); }