/* ============================================
   杭州校云智慧科技有限公司 - 官网样式
   科技风格 · 深色主题 · 响应式
   ============================================ */

/* === CSS Variables === */
:root {
    --primary: #00d4ff;
    --primary-dark: #0099cc;
    --secondary: #7b2fff;
    --accent: #00ff88;
    --bg-dark: #0a0e1a;
    --bg-card: #111827;
    --bg-card-hover: #1a2332;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(0, 212, 255, 0.15);
    --gradient-1: linear-gradient(135deg, #00d4ff, #7b2fff);
    --gradient-2: linear-gradient(135deg, #7b2fff, #00ff88);
    --gradient-3: linear-gradient(135deg, #00d4ff, #00ff88);
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

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

ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* === Gradient Text === */
.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.6);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-2px);
}

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

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

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 12px;
    padding: 6px 16px;
    border: 1px solid var(--border-color);
    border-radius: 50px;
    background: rgba(0, 212, 255, 0.05);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 700;
}

.nav-logo .logo-image {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: contain;
}

.nav-logo .logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

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

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

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

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

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: radial-gradient(ellipse at 30% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 50%, rgba(123, 47, 255, 0.08) 0%, transparent 50%),
                var(--bg-dark);
}

#particleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-grid-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 800px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: 50px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
    animation: fadeInDown 0.8s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.title-line {
    display: block;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    animation: fadeInUp 0.8s ease 0.8s both;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

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

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    animation: bounce 2s infinite;
}

.hero-scroll a {
    color: var(--primary);
    font-size: 1.5rem;
}

/* ============================================
   About Section
   ============================================ */
.about {
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(17, 24, 39, 0.5) 100%);
}

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

.about-visual {
    position: relative;
}

.about-card-stack {
    position: relative;
    height: 400px;
}

.about-image-placeholder {
    width: 100%;
    height: 100%;
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(123, 47, 255, 0.05));
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.tech-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: rotate 20s linear infinite;
    position: relative;
}

.tech-circle::before {
    content: '';
    position: absolute;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    border: 1px dashed rgba(0, 212, 255, 0.2);
    animation: rotate 30s linear infinite reverse;
}

.tech-circle::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 1px dashed rgba(123, 47, 255, 0.15);
    animation: rotate 40s linear infinite;
}

.circle-inner {
    text-align: center;
    animation: rotate 20s linear infinite reverse;
}

.circle-inner i {
    font-size: 3rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 8px;
}

.circle-inner span {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary);
}

.floating-card {
    position: absolute;
    padding: 12px 20px;
    background: rgba(17, 24, 39, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    font-weight: 500;
    z-index: 5;
    animation: float 6s ease-in-out infinite;
}

.floating-card i {
    color: var(--primary);
    font-size: 1.1rem;
}

.card-1 { top: 20px; right: -10px; animation-delay: 0s; }
.card-2 { bottom: 80px; left: -10px; animation-delay: 2s; }
.card-3 { bottom: 20px; right: 20px; animation-delay: 4s; }

.about-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-content > p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.about-features {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 16px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.about-feature h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.about-feature p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   Solutions Section
   ============================================ */
.solutions {
    background: var(--bg-dark);
}

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

.solution-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px 32px;
    transition: var(--transition);
    overflow: hidden;
}

.solution-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.4);
    box-shadow: var(--shadow-glow);
}

.solution-card.featured {
    border-color: rgba(0, 212, 255, 0.3);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(123, 47, 255, 0.05));
}

.solution-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    border-radius: 50px;
    background: var(--gradient-1);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
}

.solution-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.03) 0%, transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.solution-card:hover .solution-glow {
    opacity: 1;
}

.solution-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 24px;
    transition: var(--transition);
}

.solution-card:hover .solution-icon {
    background: var(--gradient-1);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4);
}

.solution-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.solution-tagline {
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 16px;
    font-weight: 500;
}

.solution-card > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

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

.solution-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 6px 0;
}

.solution-features li i {
    color: var(--accent);
    font-size: 0.8rem;
}

.solution-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.solution-link:hover {
    gap: 12px;
}

/* ============================================
   Advantages Section
   ============================================ */
.advantages {
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(17, 24, 39, 0.5) 100%);
}

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

.advantage-item {
    text-align: center;
    padding: 40px 24px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.advantage-item:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 212, 255, 0.3);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.15);
}

.advantage-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.6rem;
    color: var(--primary);
    transition: var(--transition);
}

.advantage-item:hover .advantage-icon {
    background: var(--gradient-1);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4);
    transform: scale(1.1);
}

.advantage-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.advantage-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Data Showcase
   ============================================ */
.data-showcase {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.03), rgba(123, 47, 255, 0.03));
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.data-item {
    text-align: center;
    position: relative;
}

.data-icon {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.data-number {
    font-size: 3rem;
    font-weight: 900;
    display: inline;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.data-unit {
    display: inline;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.data-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ============================================
   Cases Section
   ============================================ */
.cases {
    background: var(--bg-dark);
}

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

.case-card {
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.case-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.case-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(0, 212, 255, 0.3);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(123, 47, 255, 0.05));
}

.case-overlay {
    position: absolute;
    top: 12px;
    left: 12px;
}

.case-tag {
    padding: 4px 12px;
    border-radius: 50px;
    background: rgba(0, 212, 255, 0.2);
    border: 1px solid rgba(0, 212, 255, 0.3);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 500;
}

.case-info {
    padding: 24px;
}

.case-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.case-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   Partners Section
   ============================================ */
.partners {
    padding: 80px 0;
    overflow: hidden;
}

.partners-track {
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.partners-slide {
    display: flex;
    gap: 32px;
    animation: scroll 20s linear infinite;
    width: max-content;
}

.partner-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    white-space: nowrap;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.partner-item i {
    color: var(--primary);
    font-size: 1.2rem;
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(17, 24, 39, 0.5) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: stretch;
}

.contact-grid > .contact-form-wrapper {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.contact-info-panel h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-info-panel > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

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

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

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 0.95rem;
    margin-bottom: 2px;
}

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

.qq-link {
    color: var(--primary);
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

.qq-link:hover {
    color: var(--accent);
    text-decoration: underline;
}

.contact-form-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
}

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

.form-group {
    margin-bottom: 16px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: rgba(10, 14, 26, 0.6);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group select {
    appearance: none;
    cursor: pointer;
}

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

/* ============================================
   Contact Info Card (without form)
   ============================================ */
.contact-info-card h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-info-card h4 i {
    color: var(--primary);
    font-size: 1.1rem;
}

.contact-info-card > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.contact-qr-list {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
}

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

.qr-placeholder {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(123, 47, 255, 0.08));
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 8px;
    color: var(--primary);
    font-size: 2rem;
}

.qr-item span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.contact-tips {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid var(--border-color);
}

.tip-item i {
    color: var(--primary);
    font-size: 0.9rem;
}

.tip-item span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   Contact Right Panel
   ============================================ */
.contact-right-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.contact-right-panel h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-right-panel h4 i {
    color: var(--primary);
    font-size: 1.1rem;
}

.contact-right-panel > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.qr-main {
    text-align: center;
    margin-bottom: 24px;
}

.qr-image {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    display: block;
    margin: 0 auto 12px;
}

.qr-main span {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.qr-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.contact-social-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    width: 100%;
}

.contact-social-links span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.contact-social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1rem;
    transition: var(--transition);
}

.contact-social-links a:hover {
    background: var(--gradient-1);
    color: #fff;
    border-color: transparent;
    transform: translateY(-2px);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: rgba(5, 8, 15, 0.8);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-logo .logo-image {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: contain;
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: #fff;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.footer-social {
    display: flex;
    gap: 12px;
    position: relative;
}

.footer-social .social-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
}

.footer-social .social-link:hover {
    background: var(--gradient-1);
    color: #fff;
    border-color: transparent;
    transform: translateY(-2px);
}

.tooltip-content {
    position: absolute;
    bottom: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%) scale(0.95);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--bg-card);
}

.social-link:hover .tooltip-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}

.tooltip-qrcode {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 212, 255, 0.1);
    min-width: 220px;
}

.tooltip-qrcode img {
    width: 196px;
    height: 196px;
    border-radius: 10px;
    display: block;
    margin: 0 auto 10px;
}

.tooltip-qrcode span {
    display: block;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
}

.tooltip-text {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    white-space: nowrap;
}

.tooltip-text span {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.tooltip-text small {
    display: block;
    font-size: 0.75rem;
    color: var(--primary);
    opacity: 0.8;
}

.tooltip-text p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 6px 0;
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

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

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-1);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4);
}

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

.back-to-top:hover {
    transform: translateY(-4px);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .solutions-grid,
    .advantages-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .about-card-stack { height: 300px; }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(20px);
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    .nav-toggle { display: flex; }
    .hero-title { font-size: 2.2rem; }
    .hero-stats { flex-direction: column; gap: 20px; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .section-title { font-size: 1.8rem; }
    .solutions-grid,
    .advantages-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }
    .data-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-social { justify-content: center; }
    .footer-logo { justify-content: center; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.8rem; }
    .section { padding: 60px 0; }
    .solution-card { padding: 28px 20px; }
    .contact-form-wrapper { padding: 24px; }
    .contact-qr-list {
        justify-content: center;
    }
    .qr-placeholder {
        width: 100px;
        height: 100px;
    }
}