/* ============================================
   黑虎AI Official Website - Stylesheet
   ============================================ */

/* === CSS Variables === */
:root {
    --color-bg: #0a0a0f;
    --color-bg-secondary: #111118;
    --color-bg-card: #16161f;
    --color-bg-card-hover: #1c1c28;
    --color-surface: #1e1e2a;
    --color-border: rgba(255,255,255,0.08);
    --color-border-light: rgba(255,255,255,0.12);

    --color-primary: #e63946;
    --color-primary-light: #ff4d5a;
    --color-primary-dark: #c0313d;
    --color-primary-glow: rgba(230,57,70,0.3);

    --color-accent: #ff6b35;
    --color-accent-2: #f77f00;

    --color-text: #e8e8ed;
    --color-text-secondary: #a0a0b0;
    --color-text-muted: #6b6b80;
    --color-text-white: #ffffff;

    --color-traffic: #e63946;
    --color-content: #f77f00;
    --color-private: #06d6a0;
    --color-trust: #4361ee;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px var(--color-primary-glow);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

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

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

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* === Typography === */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text-white);
}

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

/* === Section Header === */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
}

.section-header p {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-top: 16px;
}

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

.section-header-left h2::after {
    left: 0;
    transform: none;
}

.update-date {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 8px;
    font-style: italic;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    box-shadow: 0 4px 15px var(--color-primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--color-primary-glow);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

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

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-light);
    background: rgba(230, 57, 70, 0.05);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 17px;
    border-radius: var(--radius-md);
}

/* === Header === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition-normal);
    background: transparent;
}

.header.scrolled {
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 800;
    color: var(--color-text-white);
}

.logo img {
    height: 50px;
    width: auto;
    border-radius: 0;
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

.btn-cta-header {
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
}

.btn-cta-header:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px var(--color-primary-glow);
}

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

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 0 80px;
}

.hero-bg-effects {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.hero-glow-1 {
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary-glow), transparent 70%);
    animation: float 8s ease-in-out infinite;
}

.hero-glow-2 {
    bottom: -20%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(67, 97, 238, 0.15), transparent 70%);
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-30px) scale(1.05); }
}

.hero-content {
    position: relative;
    text-align: center;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(230, 57, 70, 0.1);
    border: 1px solid rgba(230, 57, 70, 0.25);
    border-radius: 100px;
    font-size: 14px;
    color: var(--color-primary-light);
    font-weight: 500;
    margin-bottom: 28px;
    letter-spacing: 1px;
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-desc {
    font-size: 18px;
    color: var(--color-text-secondary);
    max-width: 720px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-desc strong {
    color: var(--color-text-white);
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
}

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

.hero-stat-num {
    font-size: 42px;
    font-weight: 800;
    color: var(--color-text-white);
    display: inline;
    font-variant-numeric: tabular-nums;
}

.hero-stat-unit {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary-light);
}

.hero-stat-label {
    display: block;
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border-light);
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 40px;
}

.hero-platforms {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.hero-platforms > span {
    font-size: 14px;
    color: var(--color-text-muted);
}

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

.platform-tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    font-size: 12px;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
}

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

/* === Solution Flow === */
.solution-flow {
    padding: 100px 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.flow-steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
}

.flow-step {
    text-align: center;
    padding: 32px 24px;
    flex: 1;
    max-width: 240px;
    position: relative;
}

.flow-step-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(230, 57, 70, 0.08);
    border: 1px solid rgba(230, 57, 70, 0.2);
    border-radius: 50%;
    color: var(--color-primary-light);
}

.flow-step-icon svg {
    width: 32px;
    height: 32px;
}

.flow-step-num {
    font-size: 12px;
    color: var(--color-primary);
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.flow-step h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.flow-step p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.flow-step-tag {
    display: inline-block;
    margin-top: 12px;
    padding: 4px 12px;
    background: rgba(230, 57, 70, 0.06);
    border: 1px solid rgba(230, 57, 70, 0.15);
    border-radius: 100px;
    font-size: 12px;
    color: var(--color-primary);
}

.flow-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 56px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.flow-arrow svg {
    width: 24px;
    height: 24px;
}

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

.product-category {
    margin-bottom: 48px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: border-color var(--transition-normal);
}

.product-category:hover {
    border-color: var(--color-border-light);
}

.product-category[data-category="traffic"] { border-left: 3px solid var(--color-traffic); }
.product-category[data-category="content"] { border-left: 3px solid var(--color-content); }
.product-category[data-category="private"] { border-left: 3px solid var(--color-private); }
.product-category[data-category="trust"] { border-left: 3px solid var(--color-trust); }

.product-category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.category-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.category-icon svg {
    width: 28px;
    height: 28px;
}

.traffic-icon { background: rgba(230, 57, 70, 0.1); color: var(--color-traffic); }
.content-icon { background: rgba(247, 127, 0, 0.1); color: var(--color-content); }
.private-icon { background: rgba(6, 214, 160, 0.1); color: var(--color-private); }
.trust-icon { background: rgba(67, 97, 238, 0.1); color: var(--color-trust); }

.product-category-header h3 {
    font-size: 22px;
    margin-bottom: 2px;
}

.category-subtitle {
    font-size: 14px;
    color: var(--color-text-muted);
}

.product-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: all var(--transition-normal);
}

.product-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.product-card-header {
    margin-bottom: 12px;
}

.product-card-header h4 {
    font-size: 18px;
    margin-bottom: 8px;
}

.product-platforms {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.product-platforms span {
    padding: 2px 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 12px;
    color: var(--color-text-muted);
}

.product-card > p {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.product-features {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.product-features li {
    font-size: 14px;
    color: var(--color-text-secondary);
    padding-left: 20px;
    position: relative;
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

/* === Features Section === */
.features {
    padding: 100px 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

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

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(230, 57, 70, 0.08);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    color: var(--color-primary-light);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.feature-card > p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.feature-card ul {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 20px;
}

.feature-card ul li {
    font-size: 13px;
    color: var(--color-text-muted);
    padding-left: 16px;
    position: relative;
}

.feature-card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 7px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-primary);
    opacity: 0.6;
}

.feature-highlight {
    padding: 8px 16px;
    background: rgba(230, 57, 70, 0.06);
    border: 1px solid rgba(230, 57, 70, 0.15);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary-light);
    text-align: center;
}

/* Advantages Banner */
.advantages-banner {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    background: linear-gradient(135deg, rgba(230, 57, 70, 0.05), rgba(67, 97, 238, 0.05));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.advantage-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.advantage-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(230, 57, 70, 0.08);
    border-radius: var(--radius-sm);
    color: var(--color-primary-light);
    flex-shrink: 0;
}

.advantage-icon svg {
    width: 22px;
    height: 22px;
}

.advantage-item strong {
    display: block;
    font-size: 15px;
    color: var(--color-text-white);
}

.advantage-item span {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* === How It Works === */
.how-it-works {
    padding: 100px 0;
}

.steps-row {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
}

.step-item {
    text-align: center;
    flex: 1;
    max-width: 300px;
    padding: 24px;
}

.step-number {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 800;
    color: var(--color-primary-light);
    background: rgba(230, 57, 70, 0.08);
    border: 2px solid rgba(230, 57, 70, 0.2);
    border-radius: 50%;
}

.step-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.step-item p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.step-connector {
    width: 80px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-border), var(--color-primary), var(--color-border));
    margin-top: 52px;
    flex-shrink: 0;
}

/* === Cases Section === */
.cases {
    padding: 100px 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

.case-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: all var(--transition-normal);
}

.case-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.case-card-featured {
    border-color: rgba(230, 57, 70, 0.2);
    background: linear-gradient(135deg, var(--color-bg-card), rgba(230, 57, 70, 0.03));
}

.case-card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.case-industry {
    font-size: 12px;
    color: var(--color-text-muted);
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 100px;
}

.case-metric {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-primary-light);
}

.case-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
}

.case-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

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

.case-tags span {
    padding: 4px 10px;
    background: rgba(230, 57, 70, 0.06);
    border: 1px solid rgba(230, 57, 70, 0.12);
    border-radius: 100px;
    font-size: 12px;
    color: var(--color-primary);
}

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

.testimonial {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
}

.testimonial-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 16px;
    position: relative;
    padding-left: 20px;
}

.testimonial-content p::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -4px;
    font-size: 28px;
    color: var(--color-primary);
    font-style: normal;
    font-weight: 700;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.testimonial-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    color: #fff;
}

.testimonial-author strong {
    display: block;
    font-size: 15px;
    color: var(--color-text-white);
}

.testimonial-author span {
    font-size: 13px;
    color: var(--color-text-muted);
}

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

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

.about-text p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-text strong {
    color: var(--color-text-white);
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.about-stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    transition: all var(--transition-normal);
}

.about-stat-card:hover {
    border-color: rgba(230, 57, 70, 0.2);
    transform: translateY(-2px);
}

.about-stat-number {
    font-size: 40px;
    font-weight: 800;
    color: var(--color-text-white);
    display: inline;
    font-variant-numeric: tabular-nums;
}

.about-stat-unit {
    font-size: 18px;
    color: var(--color-primary-light);
    font-weight: 600;
}

.about-stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* Team Background */
.team-bg {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.team-bg-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
}

.team-company {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-white);
    margin-bottom: 4px;
}

.team-desc {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* === Contact Section === */
.contact {
    padding: 100px 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(230, 57, 70, 0.08);
    border-radius: var(--radius-sm);
    color: var(--color-primary-light);
    flex-shrink: 0;
}

.contact-icon svg {
    width: 20px;
    height: 20px;
}

.contact-item strong {
    display: block;
    font-size: 14px;
    color: var(--color-text-white);
    margin-bottom: 2px;
}

.contact-item span {
    font-size: 15px;
    color: var(--color-text-secondary);
}

.contact-qr-codes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.qr-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    transition: all var(--transition-normal);
}

.qr-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
}

.qr-card img {
    width: 100%;
    max-width: 220px;
    margin: 0 auto 12px;
    border-radius: var(--radius-sm);
}

.qr-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* === CTA Section === */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(230, 57, 70, 0.08), rgba(67, 97, 238, 0.05));
}

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

.cta-content h2 {
    font-size: 36px;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.cta-contact {
    margin-top: 20px;
    font-size: 15px;
    color: var(--color-text-muted);
}

.cta-contact a {
    color: var(--color-primary-light);
    text-decoration: none;
}

/* === Inline Contact Info === */
.hero-contact-info {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-top: 16px;
    font-size: 15px;
    color: var(--color-text-secondary);
}

.hero-contact-info a {
    color: var(--color-primary-light);
    text-decoration: none;
}

.section-contact-tip {
    text-align: center;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.section-contact-tip p {
    font-size: 15px;
    color: var(--color-text-muted);
}

.section-contact-tip a {
    color: var(--color-primary-light);
    text-decoration: none;
}

.section-contact {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.section-contact a {
    color: var(--color-primary-light);
    text-decoration: none;
}

.about-contact {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
    font-size: 15px;
    color: var(--color-text-secondary);
}

.about-contact a {
    color: var(--color-primary-light);
    text-decoration: none;
}

/* === Footer === */
.footer {
    padding: 60px 0 30px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.footer-logo img {
    height: 44px;
    width: auto;
    border-radius: 0;
}

.footer-logo span {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-text-white);
}

.footer-brand p {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.footer-links h4 {
    font-size: 15px;
    margin-bottom: 16px;
    color: var(--color-text-white);
}

.footer-links a {
    display: block;
    font-size: 14px;
    color: var(--color-text-muted);
    padding: 4px 0;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-muted);
}

.footer-article-link {
    color: var(--color-text-muted);
    opacity: 0.7;
    margin-left: 10px;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.footer-article-link:hover {
    opacity: 1;
    color: var(--color-primary-light);
}

/* === Back to Top === */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* === Animations === */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* === Responsive === */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    .hero h1 {
        font-size: 44px;
    }

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

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

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 15, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 16px;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 999;
    }

    .nav.open {
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        font-size: 20px;
        padding: 12px 24px;
    }

    .btn-cta-header {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-desc br {
        display: none;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .hero-stat-num {
        font-size: 32px;
    }

    .hero-stat-divider {
        display: none;
    }

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

    .hero-scroll-indicator {
        display: none;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .section-header p {
        font-size: 15px;
    }

    .flow-steps {
        flex-direction: column;
        align-items: center;
    }

    .flow-arrow {
        transform: rotate(90deg);
        padding-top: 0;
        padding: 8px 0;
    }

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

    .product-category {
        padding: 24px;
    }

    .product-cards {
        grid-template-columns: 1fr;
    }

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

    .advantages-banner {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .steps-row {
        flex-direction: column;
        align-items: center;
    }

    .step-connector {
        width: 2px;
        height: 40px;
        margin-top: 0;
    }

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

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

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

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

    .team-bg {
        grid-template-columns: 1fr 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .cta-content h2 {
        font-size: 28px;
    }

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

@media (max-width: 480px) {
    .hero h1 {
        font-size: 26px;
    }

    .hero-stats {
        gap: 16px;
    }

    .hero-stat {
        flex: 0 0 calc(50% - 8px);
    }

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

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

    .team-bg {
        grid-template-columns: 1fr;
    }
}