/* ============================================================
   智沃数据 - 企业软件出海专家 | 官方企业官网
   设计主题: 简约大气 | 全球化科技风格
   ============================================================ */

/* CSS Variables */
:root {
    --color-primary: #1a56db;
    --color-primary-dark: #1e40af;
    --color-primary-light: #e8f0fe;
    --color-purple: #7c3aed;
    --color-purple-light: #f3e8ff;
    --color-green: #059669;
    --color-green-light: #ecfdf5;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ==================== HEADER ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--color-border-light);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

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

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transition: var(--transition);
}

.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: var(--transition);
}

/* ==================== HERO ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 100px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.12;
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: var(--color-primary);
    top: -200px;
    right: -100px;
}

.hero-glow-2 {
    width: 400px;
    height: 400px;
    background: var(--color-purple);
    bottom: -100px;
    left: -50px;
}

.hero-grid-pattern {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(26, 86, 219, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(26, 86, 219, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 28px;
}

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

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -1.5px;
    color: #0f172a;
    margin-bottom: 24px;
}

.hero-title-highlight {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    max-width: 520px;
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 56px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: -1px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* Hero Visual */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 420px;
}

.hero-card {
    position: absolute;
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    width: 160px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--color-border-light);
}

.hero-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.hero-card-1 {
    top: 20px;
    left: 20px;
    animation: float-up 5s ease-in-out infinite;
}

.hero-card-2 {
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    animation: float-up 5s ease-in-out 1s infinite;
}

.hero-card-2:hover {
    transform: translateY(calc(-50% - 8px));
}

.hero-card-3 {
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    animation: float-up 5s ease-in-out 0.5s infinite;
}

.hero-card-3:hover {
    transform: translateX(-50%) translateY(-8px);
}

@keyframes float-up {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-12px) translateX(0); }
}

.hero-card-2 {
    animation: float-up-2 5s ease-in-out 1s infinite;
}

.hero-card-3 {
    animation: float-up-3 5s ease-in-out 0.5s infinite;
}

@keyframes float-up-2 {
    0%, 100% { transform: translateY(-50%); }
    50% { transform: translateY(calc(-50% - 10px)); }
}

@keyframes float-up-3 {
    0%, 100% { transform: translateX(-50%); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

.card-icon {
    margin-bottom: 4px;
}

.card-label {
    font-size: 1.2rem;
    font-weight: 700;
    color: #0f172a;
}

.card-sub {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.hero-connection {
    position: absolute;
    width: 200px;
    height: 200px;
    border: 1px dashed rgba(26, 86, 219, 0.2);
    border-radius: 50%;
    animation: spin-slow 20s linear infinite;
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Scroll indicator */
.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--color-text-light);
    font-size: 0.75rem;
    animation: bounce-scroll 2s ease-in-out infinite;
}

@keyframes bounce-scroll {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(6px); opacity: 0.5; }
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-family: var(--font-sans);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 16px rgba(26, 86, 219, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26, 86, 219, 0.35);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

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

.btn-full {
    width: 100%;
    justify-content: center;
}

/* ==================== SECTION COMMON ==================== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 16px;
    padding: 6px 14px;
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: #0f172a;
    margin-bottom: 16px;
    line-height: 1.3;
}

.text-accent {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ==================== ABOUT ==================== */
.about {
    padding: 120px 0;
    background: var(--color-bg-alt);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 80px;
}

.about-card {
    background: white;
    padding: 36px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
}

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

.about-card-icon {
    margin-bottom: 20px;
}

.about-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #0f172a;
}

.about-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Timeline */
.about-timeline {
    position: relative;
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
}

.about-timeline::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: var(--color-border);
}

.timeline-item {
    text-align: center;
    position: relative;
    flex: 1;
    max-width: 160px;
}

.timeline-year {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 14px;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border: 3px solid white;
    border-radius: 50%;
    margin: 0 auto 16px;
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 4px var(--color-primary-light);
}

.timeline-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #0f172a;
}

.timeline-content p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* ==================== PRODUCTS ==================== */
.products {
    padding: 120px 0;
    background: var(--color-bg);
}

.product-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    padding: 60px 0;
}

.product-row + .product-row {
    border-top: 1px solid var(--color-border-light);
}

.product-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.tag-blue {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.tag-purple {
    background: var(--color-purple-light);
    color: var(--color-purple);
}

.tag-green {
    background: var(--color-green-light);
    color: var(--color-green);
}

.product-info h3 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: #0f172a;
    letter-spacing: -0.5px;
}

.product-desc {
    font-size: 1rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 28px;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.product-features li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.92rem;
    color: var(--color-text);
    line-height: 1.5;
}

.product-features li svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* Product Visual */
.product-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.product-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    border: 1px solid var(--color-border);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
}

.product-icon-box {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.product-icon-blue {
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
}

.product-icon-purple {
    background: linear-gradient(135deg, var(--color-purple) 0%, #a78bfa 100%);
}

.product-icon-green {
    background: linear-gradient(135deg, #059669 0%, #34d399 100%);
}

.product-features-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.product-features-preview span {
    padding: 6px 14px;
    background: var(--color-bg-alt);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border-light);
}

/* ==================== AI & IoT PLATFORM ==================== */
.ai-platform {
    margin-top: 80px;
    padding-top: 64px;
    border-top: 1px solid var(--color-border-light);
}

.ai-platform-header {
    text-align: center;
    margin-bottom: 48px;
}

.ai-platform-header h3 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: #0f172a;
    margin: 12px 0 16px;
}

.ai-platform-header p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.7;
}

.ai-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
    margin-bottom: 36px;
}

.ai-card {
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    padding: 24px 20px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

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

.ai-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}

.ai-tag {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    background: var(--color-bg-alt);
    color: var(--color-text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.ai-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #0f172a;
}

.ai-card p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 14px;
}

.ai-features {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.ai-features span {
    font-size: 0.72rem;
    padding: 4px 10px;
    background: var(--color-bg-alt);
    border-radius: 4px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.ai-bottom-note {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 20px 24px;
    background: var(--color-primary-light);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--color-primary-dark);
    line-height: 1.6;
}

.ai-bottom-note svg {
    flex-shrink: 0;
    margin-top: 1px;
}

/* ==================== ADVANTAGES ==================== */
.advantages {
    padding: 120px 0;
    background: var(--color-bg-alt);
}

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

.advantage-item {
    background: white;
    padding: 32px 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    text-align: center;
    transition: var(--transition);
}

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

.advantage-icon {
    margin-bottom: 16px;
    display: inline-flex;
}

.advantage-item h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #0f172a;
}

.advantage-item p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ==================== CONTACT ==================== */
.contact {
    padding: 120px 0;
    background: var(--color-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.contact-card-icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.contact-card a {
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 500;
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

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

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.form-group label span {
    color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(26, 86, 219, 0.08);
}

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

/* ==================== FOOTER ==================== */
.footer {
    padding: 64px 0 32px;
    background: var(--color-bg-dark);
    color: #cbd5e1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-desc {
    margin-top: 16px;
    font-size: 0.9rem;
    color: #94a3b8;
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.footer-links a {
    display: block;
    font-size: 0.85rem;
    color: #94a3b8;
    padding: 6px 0;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.8rem;
    color: #64748b;
}

.footer-beian a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #64748b;
    font-size: 0.8rem;
    transition: var(--transition);
}

.footer-beian a:hover {
    color: #94a3b8;
}

.footer-beian img {
    width: 16px;
    height: 16px;
}

/* ==================== SCROLL ANIMATIONS ==================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .hero-desc {
        max-width: 100%;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .product-row {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .product-row-reverse .product-visual {
        order: -1;
    }

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

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

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

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

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

    .about-timeline {
        flex-wrap: wrap;
        justify-content: center;
        gap: 32px;
    }

    .about-timeline::before {
        display: none;
    }

    .timeline-item {
        max-width: none;
        flex: 0 0 calc(50% - 32px);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .header-inner {
        padding: 0 20px;
    }

    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-toggle {
        display: flex;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-desc {
        font-size: 1rem;
    }

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

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}