/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --accent: #f43f5e;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --dark: #0f172a;
    --dark-light: #1e293b;
    --text: #334155;
    --text-light: #64748b;
    --bg: #f8fafc;
    --card-bg: rgba(255, 255, 255, 0.95);
    --glass: rgba(255, 255, 255, 0.1);
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --shadow-sm: 0 10px 40px rgba(0, 0, 0, 0.08);
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

/* 背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 70%, rgba(79, 172, 254, 0.05) 0%, transparent 40%);
    z-index: -1;
    animation: bgMove 20s ease-in-out infinite;
}

@keyframes bgMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, 1%) rotate(1deg); }
    66% { transform: translate(-1%, 2%) rotate(-1deg); }
}

/* 导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
}

.nav {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.header.scrolled .logo {
    color: #1e1b4b;
    text-shadow: none;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
    position: relative;
}

.logo-icon::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.logo:hover .logo-icon::after {
    opacity: 0.3;
}

.nav-links {
    display: flex;
    gap: 4px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    padding: 6px;
    border-radius: 50px;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-links a {
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

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

.nav-links a.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 10px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.mobile-menu-btn span {
    width: 22px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 英雄区域 */
.hero {
    min-height: 580px;
    height: 580px;
    display: flex;
    align-items: center;
    padding: 120px 0 60px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0c1445 0%, #1e3a8a 50%, #0f172a 100%);
}

/* 英雄区域背景 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(59, 130, 246, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.35) 0%, transparent 45%),
        radial-gradient(circle at 50% 80%, rgba(6, 182, 212, 0.25) 0%, transparent 40%);
    animation: heroBgMove 15s ease-in-out infinite;
    z-index: -2;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 60%, rgba(37, 99, 235, 0.2) 0%, transparent 30%),
        radial-gradient(circle at 70% 40%, rgba(14, 165, 233, 0.15) 0%, transparent 35%);
    z-index: -2;
    animation: heroBgPulse 8s ease-in-out infinite alternate;
}

/* 科技感扫描线 */
.hero-scanline {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.hero-scanline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, rgba(59, 130, 246, 0.8) 50%, transparent 100%);
    animation: scanline 4s linear infinite;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
}

.hero-scanline::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(6, 182, 212, 0.6) 50%, transparent 100%);
    animation: scanline 4s linear infinite;
    animation-delay: 2s;
}

@keyframes scanline {
    0% { top: 0; }
    100% { top: 100%; }
}

/* 科技感电路线条 */
.hero-circuit {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    opacity: 0.4;
}

.circuit-line {
    position: absolute;
    background: rgba(59, 130, 246, 0.3);
    box-shadow: 0 0 5px rgba(59, 130, 246, 0.5);
}

.circuit-line.horizontal {
    height: 1px;
}

.circuit-line.vertical {
    width: 1px;
}

.circuit-line.l1 { top: 15%; left: 5%; width: 120px; }
.circuit-line.l2 { top: 15%; left: 125px; width: 1px; height: 60px; }
.circuit-line.l3 { top: 75px; left: 5%; width: 200px; }
.circuit-line.l4 { top: 30%; right: 8%; width: 1px; height: 100px; }
.circuit-line.l5 { top: 30%; right: 108px; width: 80px; }
.circuit-line.l6 { bottom: 20%; left: 15%; width: 1px; height: 80px; }
.circuit-line.l7 { bottom: 20%; left: 15%; width: 60px; }
.circuit-line.l8 { bottom: 25%; right: 15%; width: 150px; }

.circuit-node {
    position: absolute;
    width: 6px;
    height: 6px;
    background: rgba(59, 130, 246, 0.8);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.8);
    animation: nodePulse 2s ease-in-out infinite;
}

.circuit-node.n1 { top: 14%; left: 4.5%; }
.circuit-node.n2 { top: 74px; left: 204px; animation-delay: 0.5s; }
.circuit-node.n3 { top: 30%; right: 7.5%; animation-delay: 1s; }
.circuit-node.n4 { bottom: 19%; left: 14.5%; animation-delay: 1.5s; }

@keyframes nodePulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.3); }
}

/* 科技感二进制数字 */
.hero-binary {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    opacity: 0.08;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    color: #60a5fa;
    line-height: 1.4;
}

.hero-binary-col {
    position: absolute;
    top: -50px;
    white-space: nowrap;
    animation: binaryFall 20s linear infinite;
}

.hero-binary-col:nth-child(1) { left: 5%; animation-delay: 0s; }
.hero-binary-col:nth-child(2) { left: 25%; animation-delay: -5s; }
.hero-binary-col:nth-child(3) { left: 45%; animation-delay: -10s; }
.hero-binary-col:nth-child(4) { left: 65%; animation-delay: -15s; }
.hero-binary-col:nth-child(5) { left: 85%; animation-delay: -3s; }

@keyframes binaryFall {
    0% { transform: translateY(-50px); }
    100% { transform: translateY(700px); }
}

/* 蓝色光效条纹 */
.hero-light-streaks {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
}

.hero-light-streaks::before,
.hero-light-streaks::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 600px;
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.15) 0%, transparent 100%);
    transform: rotate(-30deg);
    animation: lightStreak 8s ease-in-out infinite;
}

.hero-light-streaks::before {
    left: -100px;
    top: -200px;
}

.hero-light-streaks::after {
    right: -100px;
    top: -100px;
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.12) 0%, transparent 100%);
    animation-delay: -4s;
}

@keyframes lightStreak {
    0%, 100% { opacity: 0.5; transform: rotate(-30deg) translateY(0); }
    50% { opacity: 0.8; transform: rotate(-30deg) translateY(50px); }
}

/* 装饰性网格线 */
.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: -1;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

/* 浮动粒子 */
.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: linear-gradient(135deg, #60a5fa 0%, #818cf8 100%);
    border-radius: 50%;
    opacity: 0.6;
    animation: particleFloat 20s linear infinite;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

.particle:nth-child(1) { left: 10%; top: 20%; animation-delay: 0s; animation-duration: 25s; }
.particle:nth-child(2) { left: 20%; top: 80%; animation-delay: -3s; animation-duration: 20s; width: 4px; height: 4px; }
.particle:nth-child(3) { left: 35%; top: 40%; animation-delay: -6s; animation-duration: 22s; }
.particle:nth-child(4) { left: 50%; top: 60%; animation-delay: -9s; animation-duration: 28s; width: 8px; height: 8px; }
.particle:nth-child(5) { left: 65%; top: 30%; animation-delay: -12s; animation-duration: 24s; width: 5px; height: 5px; }
.particle:nth-child(6) { left: 75%; top: 70%; animation-delay: -15s; animation-duration: 26s; }
.particle:nth-child(7) { left: 85%; top: 50%; animation-delay: -18s; animation-duration: 21s; width: 4px; height: 4px; }
.particle:nth-child(8) { left: 90%; top: 15%; animation-delay: -2s; animation-duration: 23s; }

@keyframes heroBgMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(2%, 1%) rotate(1deg); }
    50% { transform: translate(-1%, 2%) rotate(-1deg); }
    75% { transform: translate(1%, -1%) rotate(0.5deg); }
}

@keyframes heroBgPulse {
    0% { opacity: 0.5; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}

@keyframes particleFloat {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 0.6; }
    25% { transform: translate(100px, -50px) rotate(90deg); opacity: 0.8; }
    50% { transform: translate(50px, -100px) rotate(180deg); opacity: 0.5; }
    75% { transform: translate(-50px, -50px) rotate(270deg); opacity: 0.7; }
    100% { transform: translate(0, 0) rotate(360deg); opacity: 0.6; }
}

/* 右侧装饰光圈 */
.hero-glow {
    position: absolute;
    right: -100px;
    top: 50%;
    transform: translateY(-50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.4) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    animation: glowPulse 6s ease-in-out infinite alternate;
}

.hero-glow::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: glowInner 4s ease-in-out infinite alternate;
}

@keyframes glowPulse {
    0% { opacity: 0.6; transform: translateY(-50%) scale(1); }
    100% { opacity: 1; transform: translateY(-50%) scale(1.1); }
}

@keyframes glowInner {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
}

/* 英雄区域文字颜色调整 */
.hero .hero-text h1 {
    color: #ffffff;
}

.hero .hero-text p {
    color: rgba(255, 255, 255, 0.85);
}

.hero .float-card {
    background: rgba(15, 32, 72, 0.8);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.hero .float-card h4 {
    color: #ffffff;
}

.hero .float-card p {
    color: rgba(255, 255, 255, 0.7);
}

.hero .btn-outline {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.hero .btn-outline:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
}

/* 左侧蓝色光效 */
.hero-blue-accent {
    position: absolute;
    left: -150px;
    top: 50%;
    transform: translateY(-50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
    animation: blueAccentPulse 5s ease-in-out infinite alternate;
}

@keyframes blueAccentPulse {
    0% { opacity: 0.4; transform: translateY(-50%) scale(1); }
    100% { opacity: 0.7; transform: translateY(-50%) scale(1.15); }
}

/* 调整浮动卡片高度 */
.floating-cards {
    height: 380px !important;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.8rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--dark);
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero-text h1 .gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 36px;
    max-width: 520px;
}

.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-weight: 600;
    font-size: 1rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(99, 102, 241, 0.5);
}

.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-primary:hover::after {
    opacity: 1;
}

.btn-outline {
    background: white;
    color: var(--dark);
    border: 2px solid #e2e8f0;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.15);
}

/* 3D卡片效果 */
.hero-visual {
    position: relative;
    perspective: 1000px;
}

.floating-cards {
    position: relative;
    width: 100%;
    height: 450px;
}

.float-card {
    position: absolute;
    background: var(--card-bg);
    border-radius: 24px;
    padding: 28px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.float-card:nth-child(1) {
    width: 320px;
    top: 20px;
    left: 0;
    animation: float1 6s ease-in-out infinite;
}

.float-card:nth-child(2) {
    width: 280px;
    top: 120px;
    right: 0;
    animation: float2 7s ease-in-out infinite;
}

.float-card:nth-child(3) {
    width: 260px;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    animation: float3 5s ease-in-out infinite;
}

@keyframes float1 {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
}

@keyframes float2 {
    0%, 100% { transform: translateY(0) rotate(3deg); }
    50% { transform: translateY(-15px) rotate(-1deg); }
}

@keyframes float3 {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-25px); }
}

.float-card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.float-card h4 {
    font-size: 1.1rem;
    color: var(--dark);
    margin-bottom: 8px;
}

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

/* 统计区域 */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin: 60px 0;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

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

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

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

.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-light);
    margin-top: 8px;
    font-size: 0.95rem;
}

/* 特色服务 */
.features {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-desc {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 36px 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 300%;
    height: 300%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.05) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.5s ease;
}

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

.feature-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow);
}

.feature-icon {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.feature-icon.purple { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; }
.feature-icon.pink { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); color: white; }
.feature-icon.blue { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); color: white; }
.feature-icon.green { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); color: white; }
.feature-icon.orange { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); color: white; }
.feature-icon.cyan { background: linear-gradient(135deg, #0fd850 0%, #f9f047 100%); color: white; }

.feature-card h3 {
    font-size: 1.3rem;
    color: var(--dark);
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.feature-card p {
    color: var(--text-light);
    position: relative;
    z-index: 1;
}

/* 论文分类 */
.categories {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--bg) 0%, #f1f5f9 100%);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.category-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
}

.category-card h4 {
    color: var(--dark);
    margin-bottom: 6px;
    font-size: 1.05rem;
}

.category-card span {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* 最新论文 */
.latest-papers {
    padding: 80px 0;
}

/* 论文列表 - 简洁标题样式 */
.papers-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.paper-item {
    display: grid;
    grid-template-columns: 60px 1fr 160px;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    border: 1px solid #f1f5f9;
    transition: all 0.3s ease;
    text-decoration: none;
}

.paper-item:hover {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-color: #e2e8f0;
    transform: translateX(8px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.paper-num {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-light);
}

.paper-item:hover .paper-num {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.paper-title {
    font-weight: 600;
    color: var(--dark);
    font-size: 1.05rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.paper-author {
    color: var(--text-light);
    font-size: 0.9rem;
    white-space: nowrap;
}

.paper-price {
    font-size: 1.2rem;
    font-weight: 800;
    color: #f59e0b;
    white-space: nowrap;
    min-width: 70px;
    text-align: right;
}

/* 页脚 */
.footer {
    background: var(--dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-top: 16px;
    line-height: 1.8;
}

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
}

.footer-section a:hover {
    color: white;
    padding-left: 6px;
}

.footer-section li i {
    margin-right: 8px;
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* 列表页样式 */
.page-header {
    background: var(--gradient-1);
    color: white;
    padding: 140px 0 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 80%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
}

.page-header h1 {
    font-size: 2.6rem;
    font-weight: 800;
    margin-bottom: 12px;
    position: relative;
}

.page-header p {
    opacity: 0.9;
    font-size: 1.1rem;
    position: relative;
}

.filter-section {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 28px;
    box-shadow: var(--shadow-sm);
    margin: -30px 0 40px;
    position: relative;
    z-index: 10;
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.filter-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-group label {
    font-weight: 600;
    color: var(--text);
    font-size: 0.95rem;
}

.filter-group select {
    padding: 10px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    background: white;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary);
}

.papers-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 40px;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 40px 0;
}

.pagination button {
    width: 44px;
    height: 44px;
    border: 2px solid #e2e8f0;
    background: white;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: var(--text);
}

.pagination button:hover,
.pagination button.active {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
}

/* 定制页样式 */
.service-section {
    padding: 80px 0;
}

.service-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-bottom: 60px;
}

.step-card {
    text-align: center;
    position: relative;
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--gradient-1);
    color: white;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 800;
    margin: 0 auto 20px;
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.step-card h4 {
    color: var(--dark);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

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

.form-section {
    background: var(--card-bg);
    padding: 48px;
    border-radius: 32px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.8);
    max-width: 900px;
    margin: 0 auto;
}

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

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e2e8f0;
    border-radius: 14px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group textarea {
    min-height: 160px;
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: 1100px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--card-bg);
    padding: 40px 32px;
    border-radius: 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: all 0.5s ease;
    position: relative;
}

.pricing-card.featured {
    border: 3px solid transparent;
    background: linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
                var(--gradient-1) border-box;
    transform: scale(1.05);
}

.pricing-card.featured::before {
    content: '最受欢迎';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-1);
    color: white;
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 1.4rem;
    color: var(--dark);
    margin-bottom: 16px;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
}

.price span {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 400;
}

.pricing-card ul {
    text-align: left;
    margin: 24px 0;
}

.pricing-card li {
    padding: 12px 0;
    color: var(--text);
    border-bottom: 1px solid #f1f5f9;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pricing-card li i {
    color: #10b981;
}

/* 联系页样式 */
.contact-section {
    padding: 80px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
}

.contact-info {
    background: var(--gradient-1);
    padding: 48px;
    border-radius: 32px;
    color: white;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.contact-info > p {
    opacity: 0.9;
    margin-bottom: 32px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 28px;
}

.info-item i {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.info-text h4 {
    margin-bottom: 4px;
}

.info-text p {
    opacity: 0.9;
    font-size: 0.95rem;
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

.social-links a {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: white;
    color: var(--primary);
    transform: translateY(-4px);
}

.contact-form-wrapper {
    background: var(--card-bg);
    padding: 48px;
    border-radius: 32px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

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

/* 详情页样式 */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 40px;
}

.detail-sidebar {
    background: var(--card-bg);
    border-radius: 28px;
    padding: 36px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.detail-cover {
    height: 280px;
    background: var(--gradient-1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.detail-cover i {
    font-size: 7rem;
    color: rgba(255, 255, 255, 0.4);
}

.detail-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.detail-tag {
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.85rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.detail-title {
    font-size: 1.6rem;
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.4;
}

.detail-meta {
    display: flex;
    gap: 20px;
    padding: 16px 0;
    border-top: 1px solid #f1f5f9;
    border-bottom: 1px solid #f1f5f9;
    margin-bottom: 20px;
}

.detail-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.detail-price {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.detail-buttons {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.detail-buttons .btn {
    flex: 1;
    justify-content: center;
}

.detail-content {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.content-card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.content-card h3 {
    color: var(--dark);
    margin-bottom: 20px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-card h3 i {
    color: var(--primary);
}

.toc-list {
    color: var(--text);
}

.toc-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid #f1f5f9;
}

.toc-item:last-child {
    border-bottom: none;
}

.toc-chapter {
    color: var(--primary);
    font-weight: 700;
    font-size: 0.95rem;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.spec-item {
    background: #f8fafc;
    padding: 16px;
    border-radius: 14px;
}

.spec-label {
    color: var(--text-light);
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.spec-value {
    color: var(--dark);
    font-weight: 700;
    font-size: 1.05rem;
}

/* 响应式设计 */
@media (max-width: 1100px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text p {
        margin: 0 auto 36px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        box-shadow: var(--shadow);
        border-radius: 0 0 20px 20px;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .features-grid,
    .categories-grid,
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .papers-grid,
    .papers-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .service-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid,
    .detail-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-text h1 {
        font-size: 2.4rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stats,
    .features-grid,
    .categories-grid,
    .papers-grid,
    .papers-list,
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .filter-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .service-steps {
        grid-template-columns: 1fr;
    }
    
    .form-section,
    .contact-form-wrapper {
        padding: 28px;
    }
    
    .pricing-card.featured {
        transform: none;
    }
}

/* 热门标签 */
.tag-item {
    display: inline-block;
    padding: 10px 20px;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 24px;
    color: var(--text);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.tag-item:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}