/* ============================================
   北京特别准人智科技有限公司 - 官网样式
   ============================================ */

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

:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --accent-dark: #0891b2;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --gradient-1: linear-gradient(135deg, #1a56db 0%, #06b6d4 100%);
    --gradient-2: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #1a56db 100%);
    --gradient-3: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

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

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

/* === Typography === */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto 48px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background: rgba(26, 86, 219, 0.08);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

/* === Header / Navigation === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: var(--transition);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    font-weight: 800;
}

.logo-text span {
    color: var(--primary);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list a {
    padding: 10px 20px;
    border-radius: 50px;
    color: var(--gray-600);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--primary);
    background: rgba(26, 86, 219, 0.06);
}

.nav-list a.active {
    font-weight: 600;
}

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

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

/* === Hero Section === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-2);
    overflow: hidden;
    padding-top: 76px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
    border-radius: 50%;
    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-particles {
    position: absolute;
    inset: 0;
    opacity: 0.4;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.9);
    border-radius: 50px;
    font-size: 0.9rem;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 900;
    color: white;
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.hero-title span {
    background: linear-gradient(135deg, #06b6d4, #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 560px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 20px rgba(26,86,219,0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(26,86,219,0.5);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.5);
    transform: translateY(-2px);
}

.btn-white {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Hero Decorative Elements */
.hero-visual {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.hero-card {
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 380px;
}

.hero-card-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-3);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.hero-card h3 {
    color: white;
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.hero-card p {
    color: rgba(255,255,255,0.65);
    font-size: 0.95rem;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.15);
}

.hero-stat h4 {
    color: white;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.hero-stat p {
    color: rgba(255,255,255,0.6);
    font-size: 0.85rem;
    margin-top: 6px;
}

/* === Stats Bar === */
.stats-bar {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 28px 0;
}

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

.stat-item {
    text-align: center;
    padding: 0 20px;
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background: var(--gray-200);
}

.stat-number {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-top: 8px;
}

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

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

.section-gray {
    background: var(--gray-50);
}

/* === Service Cards === */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.service-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

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

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.service-icon.blue { background: rgba(26,86,219,0.1); color: var(--primary); }
.service-icon.cyan { background: rgba(6,182,212,0.1); color: var(--accent); }
.service-icon.purple { background: rgba(139,92,246,0.1); color: #8b5cf6; }
.service-icon.green { background: rgba(16,185,129,0.1); color: #10b981; }
.service-icon.orange { background: rgba(249,115,22,0.1); color: #f97316; }
.service-icon.rose { background: rgba(244,63,94,0.1); color: #f43f5e; }

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

.service-card p {
    color: var(--gray-500);
    font-size: 0.95rem;
    line-height: 1.7;
}

.service-features {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-tag {
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* === About Section === */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-image {
    position: relative;
}

.about-img-main {
    background: var(--gradient-2);
    border-radius: var(--radius-xl);
    padding: 60px;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.about-img-decoration {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 150px;
    height: 150px;
    background: var(--gradient-3);
    border-radius: var(--radius-lg);
    opacity: 0.8;
    z-index: -1;
}

.about-img-content {
    text-align: center;
    color: white;
}

.about-img-content .big-number {
    font-size: 5rem;
    font-weight: 900;
    line-height: 1;
    background: linear-gradient(135deg, #06b6d4, #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-img-content p {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.7);
    margin-top: 8px;
}

.about-info h2 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 20px;
}

.about-info .lead {
    font-size: 1.125rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 20px;
    padding-left: 16px;
    border-left: 4px solid var(--primary);
}

.about-info p {
    color: var(--gray-600);
    line-height: 1.8;
    margin-bottom: 24px;
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 32px;
}

.info-card {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 20px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.info-card:hover {
    background: white;
    box-shadow: var(--shadow-md);
}

.info-card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.info-card-text h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--dark);
}

.info-card-text p {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin: 4px 0 0;
    line-height: 1.5;
}

/* === Timeline === */
.timeline {
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-200);
}

.timeline-item {
    position: relative;
    padding-bottom: 36px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -32px;
    top: 2px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--gradient-1);
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--primary);
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 6px;
}

.timeline-content h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.timeline-content p {
    color: var(--gray-500);
    font-size: 0.9rem;
}

/* === Solution Cards === */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.solution-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    display: flex;
    gap: 24px;
}

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

.solution-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    flex-shrink: 0;
}

.solution-info h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--dark);
}

.solution-info p {
    color: var(--gray-500);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 12px;
}

.solution-points {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.solution-point {
    padding: 3px 10px;
    background: var(--gray-100);
    border-radius: 50px;
    font-size: 0.78rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* === CTA Section === */
.cta-section {
    background: var(--gradient-2);
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6,182,212,0.2) 0%, transparent 70%);
    border-radius: 50%;
}

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

.cta-content h2 {
    color: white;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-content p {
    color: rgba(255,255,255,0.7);
    font-size: 1.125rem;
    margin-bottom: 36px;
}

/* === Product Cards === */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.product-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    position: relative;
}

.product-image.ai { background: linear-gradient(135deg, #1a56db, #3b82f6); }
.product-image.data { background: linear-gradient(135deg, #06b6d4, #22d3ee); }
.product-image.sports { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.product-image.ecommerce { background: linear-gradient(135deg, #10b981, #34d399); }
.product-image.security { background: linear-gradient(135deg, #f97316, #fb923c); }
.product-image.design { background: linear-gradient(135deg, #f43f5e, #fb7185); }

.product-body {
    padding: 24px;
}

.product-body h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark);
}

.product-body p {
    color: var(--gray-500);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.product-meta {
    display: flex;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--gray-400);
}

/* === Partners Section === */
.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

.partner-logo {
    padding: 20px 32px;
    background: white;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    color: var(--gray-400);
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
}

.partner-logo:hover {
    color: var(--primary);
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

/* === News Grid === */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.news-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    cursor: pointer;
}

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

.news-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    background: var(--gradient-3);
    color: white;
}

.news-body {
    padding: 24px;
}

.news-date {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 8px;
}

.news-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.5;
    color: var(--dark);
}

.news-body p {
    color: var(--gray-500);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === Contact Section === */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-info-card {
    background: var(--gradient-2);
    border-radius: var(--radius-xl);
    padding: 48px 36px;
    color: white;
}

.contact-info-card h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.contact-info-card > p {
    color: rgba(255,255,255,0.7);
    margin-bottom: 36px;
    line-height: 1.7;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-item-icon {
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-item-text h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.contact-item-text p {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
}

.contact-form-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 48px 36px;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
}

.contact-form-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 28px;
    color: var(--dark);
}

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

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--gray-50);
    color: var(--gray-800);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
    background: white;
}

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

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

.btn-submit {
    width: 100%;
    padding: 16px;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(26,86,219,0.3);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(26,86,219,0.45);
}

/* === Footer === */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.65);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand h3 {
    color: white;
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.footer-brand h3 span {
    color: var(--accent);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.08);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: var(--transition);
    color: rgba(255,255,255,0.6);
}

.footer-social a:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

.footer-col h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: rgba(255,255,255,0.55);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: white;
    padding-left: 6px;
}

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

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

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

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

/* === Page Hero (Inner Pages) === */
.page-hero {
    background: var(--gradient-2);
    padding: 140px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6,182,212,0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.page-hero h1 {
    color: white;
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.page-hero p {
    color: rgba(255,255,255,0.7);
    font-size: 1.125rem;
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 8px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: rgba(255,255,255,0.6);
}

.breadcrumb a:hover {
    color: white;
}

/* === Values Section === */
.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-card {
    text-align: center;
    padding: 36px 24px;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.value-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 20px;
}

.value-icon.blue { background: rgba(26,86,219,0.1); color: var(--primary); }
.value-icon.cyan { background: rgba(6,182,212,0.1); color: var(--accent); }
.value-icon.purple { background: rgba(139,92,246,0.1); color: #8b5cf6; }
.value-icon.green { background: rgba(16,185,129,0.1); color: #10b981; }

.value-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--dark);
}

.value-card p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.6;
}

/* === Certifications === */
.certs-grid {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.cert-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 32px;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.cert-icon {
    font-size: 2.5rem;
}

.cert-text h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--dark);
}

.cert-text p {
    font-size: 0.82rem;
    color: var(--gray-500);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.75rem; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .values-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
}

@media (max-width: 768px) {
    .hero-title { font-size: 2.25rem; }
    .section-title { font-size: 1.75rem; }
    .services-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: 1fr; }
    .news-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .values-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .info-cards { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    
    .nav-list {
        display: none;
        position: fixed;
        top: 76px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    }
    
    .nav-list.open {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-visual { display: none; }
    .hero-content { max-width: 100%; }
    .hero-buttons { flex-direction: column; }
    .hero-stats { flex-direction: column; gap: 20px; }
    .stat-item:not(:last-child)::after { display: none; }
}

/* === Animations === */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* === Back to Top === */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--gradient-1);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    border: none;
}

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

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

/* === Page-specific: About detail cards === */
.detail-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.detail-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid var(--gray-200);
    text-align: center;
    transition: var(--transition);
}

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

.detail-card .detail-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.detail-card h4 {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 6px;
}

.detail-card .detail-value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--dark);
}

@media (max-width: 768px) {
    .detail-cards { grid-template-columns: 1fr; }
}

/* ============================================
   付费资讯页面样式
   ============================================ */

/* === Pay Intro Grid === */
.pay-intro-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.pay-intro-item {
    background: white;
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.pay-intro-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.pay-intro-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.pay-intro-item h4 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 6px;
}

.pay-intro-item p {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin: 0;
}

/* === Paid Articles Grid === */
.pay-articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.pay-article-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 32px;
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.pay-article-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.pay-article-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.pay-article-tag {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    letter-spacing: 0.02em;
}

.tag-ai { background: #dbeafe; color: #1d4ed8; }
.tag-manufacture { background: #fef3c7; color: #b45309; }
.tag-finance { background: #fce7f3; color: #be185d; }
.tag-data { background: #cffafe; color: #0e7490; }
.tag-security { background: #fce7f3; color: #9d174d; }
.tag-medical { background: #d1fae5; color: #065f46; }
.tag-retail { background: #ede9fe; color: #6d28d9; }
.tag-iot { background: #fff7ed; color: #c2410c; }
.tag-consulting { background: #e0e7ff; color: #3730a3; }

.pay-article-date {
    font-size: 0.8rem;
    color: var(--gray-400);
}

.pay-article-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
    line-height: 1.5;
}

.pay-article-desc {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

.pay-article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px dashed var(--gray-200);
}

.pay-article-price {
    font-size: 1.4rem;
    font-weight: 800;
    color: #f97316;
}

.pay-article-stats {
    font-size: 0.8rem;
    color: var(--gray-400);
}

/* === Lock overlay on article === */
.pay-article-lock {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.45), transparent);
    padding: 60px 32px 28px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 2;
}

.pay-article-lock:hover {
    background: linear-gradient(to top, rgba(15, 23, 42, 0.97), rgba(15, 23, 42, 0.55), transparent);
}

.pay-article-lock .pay-lock-icon {
    font-size: 2rem;
    margin-bottom: 6px;
    animation: lockPulse 2s ease-in-out infinite;
}

@keyframes lockPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.pay-article-lock span {
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

/* === Full article content (hidden by default) === */
.pay-article-full {
    display: none;
    margin-top: 0;
}

.pay-article-full.show {
    display: block;
}

.article-divider {
    height: 1px;
    background: var(--gray-200);
    margin: 20px 0;
}

.pay-article-full h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--dark);
    margin: 24px 0 12px;
}

.pay-article-full h4:first-child {
    margin-top: 0;
}

.pay-article-full p {
    font-size: 0.93rem;
    color: var(--gray-600);
    line-height: 1.85;
    margin-bottom: 14px;
}

/* Unlocked state */
.pay-article-card.unlocked .pay-article-lock {
    display: none;
}

/* === Pricing Grid === */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.pricing-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 36px 28px;
    border: 2px solid var(--gray-200);
    text-align: center;
    transition: var(--transition);
    position: relative;
}

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

.pricing-card.popular {
    border-color: #4f46e5;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.pricing-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #4f46e5, #6366f1);
    color: white;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.pricing-header {
    margin-bottom: 24px;
}

.pricing-header h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    line-height: 1;
}

.pricing-price span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-500);
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin: 0 0 28px;
    text-align: left;
}

.pricing-features li {
    padding: 8px 0;
    color: var(--gray-600);
    font-size: 0.9rem;
    border-bottom: 1px solid #f1f5f9;
}

.pricing-features li::before {
    content: "✓ ";
    color: #10b981;
    font-weight: 700;
}

.pricing-cta-text {
    color: var(--gray-400);
    font-size: 0.85rem;
    padding: 12px 0 0;
}

/* ============================================
   支付弹窗 Modal
   ============================================ */
.pay-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(6px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.pay-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.pay-modal {
    background: white;
    border-radius: var(--radius-xl);
    width: 440px;
    max-width: 92vw;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0,0,0,0.3);
    transform: translateY(20px);
    transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1);
}

.pay-modal-overlay.active .pay-modal {
    transform: translateY(0);
}

.pay-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: #f1f5f9;
    color: #64748b;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 1;
}

.pay-modal-close:hover {
    background: #e2e8f0;
    color: #0f172a;
}

.pay-modal-header {
    text-align: center;
    padding: 36px 32px 8px;
}

.pay-modal-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.pay-modal-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.pay-modal-header p {
    font-size: 0.88rem;
    color: var(--gray-500);
    margin: 0;
}

.pay-modal-body {
    padding: 8px 32px 24px;
}

.pay-modal-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: #f8fafc;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}

.pay-modal-article-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark);
    flex: 1;
    margin-right: 12px;
}

.pay-modal-price {
    font-size: 1.3rem;
    font-weight: 800;
    color: #f97316;
    white-space: nowrap;
}

/* QR Code */
.qr-code-wrapper {
    text-align: center;
}

.qr-code-container {
    display: inline-block;
}

.qr-code-real {
    width: 220px;
    height: 220px;
    margin: 0 auto;
    background: white;
    border: 8px solid #07c160;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(7, 193, 96, 0.2);
}

.qr-code-real img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.qr-tip {
    margin-top: 16px;
    font-size: 0.88rem;
    color: var(--gray-600);
}

.qr-tip-icon {
    margin-right: 4px;
}

.pay-modal-hint {
    margin-top: 16px;
    padding: 10px 14px;
    background: #fffbeb;
    border: 1px solid #fde68a;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    color: #92400e;
    text-align: center;
}

.pay-modal-status {
    margin-top: 12px;
    padding: 12px 16px;
    background: #f0fdf4;
    border: 1px solid #86efac;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: #166534;
    text-align: center;
    line-height: 1.6;
}

.pay-modal-status.success {
    background: #dcfce7;
    border-color: #22c55e;
    color: #14532d;
    font-weight: 600;
}

.pay-modal-footer {
    padding: 0 32px 32px;
    text-align: center;
}

.pay-modal-footer .btn-primary {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    border: none;
    cursor: pointer;
}

/* ============================================
   Responsive for paid info page
   ============================================ */
@media (max-width: 992px) {
    .pay-articles-grid {
        grid-template-columns: 1fr;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 420px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .pay-intro-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .pay-article-card {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .pay-intro-grid {
        grid-template-columns: 1fr;
    }
    .pay-modal {
        max-width: 96vw;
    }
    .pay-modal-body,
    .pay-modal-header,
    .pay-modal-footer {
        padding-left: 20px;
        padding-right: 20px;
    }
}

/* ============================================
   法律条款弹窗
   ============================================ */
.legal-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(6px);
    z-index: 11000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.legal-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.legal-modal {
    background: white;
    border-radius: var(--radius-xl);
    width: 680px;
    max-width: 92vw;
    max-height: 82vh;
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0,0,0,0.3);
    transform: translateY(20px);
    transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1);
    position: relative;
}

.legal-modal-overlay.active .legal-modal {
    transform: translateY(0);
}

.legal-modal-close {
    position: sticky;
    top: 16px;
    float: right;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: #f1f5f9;
    color: #64748b;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 10;
    margin-right: 16px;
}

.legal-modal-close:hover {
    background: #e2e8f0;
    color: #0f172a;
}

.legal-modal-header {
    padding: 32px 32px 0;
}

.legal-modal-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0;
    padding-bottom: 16px;
    border-bottom: 2px solid #e2e8f0;
}

.legal-modal-body {
    padding: 24px 32px 40px;
    font-size: 0.9rem;
    color: #475569;
    line-height: 1.85;
}

.legal-modal-body h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: #1e293b;
    margin: 24px 0 10px;
}

.legal-modal-body h4:first-child {
    margin-top: 0;
}

.legal-modal-body p {
    margin-bottom: 12px;
    text-indent: 2em;
}

.legal-modal-body ul {
    margin: 8px 0 16px 1.5em;
    padding: 0;
}

.legal-modal-body ul li {
    margin-bottom: 6px;
}

.legal-modal-body .legal-date {
    text-align: right;
    color: #94a3b8;
    font-size: 0.85rem;
    margin-top: 24px;
}

@media (max-width: 640px) {
    .legal-modal {
        max-width: 96vw;
        max-height: 88vh;
    }
    .legal-modal-header {
        padding: 24px 20px 0;
    }
    .legal-modal-body {
        padding: 20px;
    }
}