/* 全局样式重置和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 江苏省人工智能学会主题色 */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    
    /* 功能色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    /* 中性色 */
    --white: #ffffff;
    --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;
    
    /* 文字颜色 */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-muted: var(--gray-500);
    
    /* 背景色 */
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
}

/* 解决Vue渲染闪烁问题 */
[v-cloak] {
    display: none !important;
}

/* 基础样式 */
html {
    scroll-behavior: smooth;
}

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

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1600px;
    margin: 0 auto;
}

/* 只有logo的navbar样式 */
.nav-container.logo-only {
    justify-content: space-between;
}

/* 用户信息区域 */
.nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.logout-btn {
    background: var(--danger-color);
    color: var(--white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-img {
    /* width: 40px; */
    height: 40px;
    border-radius: var(--radius);
    object-fit: cover;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.admin-link {
    /* background: var(--primary-color);
    color: var(--white) !important; */
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    transition: all 0.3s ease;
}

.admin-link:hover {
    /* background: var(--primary-dark); */
    transform: translateY(-1px);
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height:80vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #3563e5 0%, #4582e5 25%, #3e8ae8 50%, #6ea8e8 75%, #b6ceee 100%);
    overflow: hidden;
    padding-top: 55px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.hero-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    animation: float 6s ease-in-out infinite;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.shape-1 {
    width: 200px;
    height: 200px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.shape-3 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

.shape-4 {
    width: 80px;
    height: 80px;
    top: 30%;
    right: 30%;
    animation-delay: 1s;
}

.shape-5 {
    width: 120px;
    height: 120px;
    bottom: 40%;
    right: 10%;
    animation-delay: 3s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* AI神经网络背景 */
.neural-network {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.neural-node {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
    animation: pulse 2s ease-in-out infinite;
}

.node-1 { top: 20%; left: 15%; animation-delay: 0s; }
.node-2 { top: 30%; right: 20%; animation-delay: 0.5s; }
.node-3 { top: 50%; left: 25%; animation-delay: 1s; }
.node-4 { top: 60%; right: 30%; animation-delay: 1.5s; }
.node-5 { top: 70%; left: 40%; animation-delay: 2s; }
.node-6 { top: 80%; right: 45%; animation-delay: 2.5s; }

.neural-connection {
    position: absolute;
    height: 1px;
    background: linear-gradient(90deg, transparent, #ffffff, transparent);
    animation: dataFlow 3s linear infinite;
}

.connection-1 {
    top: 25%;
    left: 15%;
    width: 200px;
    transform: rotate(15deg);
    animation-delay: 0s;
}

.connection-2 {
    top: 40%;
    right: 20%;
    width: 150px;
    transform: rotate(-20deg);
    animation-delay: 1s;
}

.connection-3 {
    top: 55%;
    left: 25%;
    width: 180px;
    transform: rotate(10deg);
    animation-delay: 2s;
}

.connection-4 {
    top: 65%;
    right: 30%;
    width: 120px;
    transform: rotate(-15deg);
    animation-delay: 0.5s;
}

.connection-5 {
    top: 75%;
    left: 40%;
    width: 160px;
    transform: rotate(25deg);
    animation-delay: 1.5s;
}

/* 数据流效果 */
.data-streams {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.data-stream {
    position: absolute;
    width: 2px;
    height: 100px;
    background: linear-gradient(to bottom, transparent, #ffffff, transparent);
    animation: streamFlow 4s linear infinite;
}

.stream-1 {
    left: 20%;
    animation-delay: 0s;
}

.stream-2 {
    left: 50%;
    animation-delay: 1.5s;
}

.stream-3 {
    right: 20%;
    animation-delay: 3s;
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1);
        opacity: 0.8;
    }
    50% { 
        transform: scale(1.5);
        opacity: 1;
    }
}

@keyframes dataFlow {
    0% { 
        opacity: 0;
        transform: translateX(-50px);
    }
    50% { 
        opacity: 1;
    }
    100% { 
        opacity: 0;
        transform: translateX(50px);
    }
}

@keyframes streamFlow {
    0% { 
        transform: translateY(-100px);
        opacity: 0;
    }
    50% { 
        opacity: 1;
    }
    100% { 
        transform: translateY(100vh);
        opacity: 0;
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero-text {
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.title-main {
    display: block;
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
    white-space: nowrap;
}

.title-sub {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 600;
    opacity: 0.9;
}

.title-ai {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 400;
    opacity: 0.8;
    color: #ffffff;
    margin-top: var(--spacing-sm);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.hero-description {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

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

.stat-number {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.hero-features {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

/* AI机器人样式 */
.ai-robot {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 3;
}

.robot-container {
    position: relative;
    width: 350px;
    /* height: 200px; */
    display: flex;
    align-items: center;
    justify-content: center;
}

.robot-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    animation: robotFloat 4s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.3));
    transition: all 0.3s ease;
}

.robot-image:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 30px rgba(255, 255, 255, 0.5));
}

.robot-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: glowPulse 3s ease-in-out infinite;
    z-index: -1;
}

.robot-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
    animation: particleFloat 6s linear infinite;
}

.particle-1 {
    top: 20%;
    left: 30%;
    animation-delay: 0s;
}

.particle-2 {
    top: 40%;
    right: 20%;
    animation-delay: 1.2s;
}

.particle-3 {
    bottom: 30%;
    left: 20%;
    animation-delay: 2.4s;
}

.particle-4 {
    top: 60%;
    right: 40%;
    animation-delay: 3.6s;
}

.particle-5 {
    bottom: 20%;
    right: 30%;
    animation-delay: 4.8s;
}

@keyframes robotFloat {
    0%, 100% { 
        transform: translateY(0px) rotate(0deg);
    }
    25% { 
        transform: translateY(-8px) rotate(1deg);
    }
    50% { 
        transform: translateY(-12px) rotate(0deg);
    }
    75% { 
        transform: translateY(-8px) rotate(-1deg);
    }
}

@keyframes glowPulse {
    0%, 100% { 
        opacity: 0.3;
        transform: translate(-50%, -50%) scale(1);
    }
    50% { 
        opacity: 0.6;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

@keyframes particleFloat {
    0% { 
        opacity: 0;
        transform: translateY(0px) scale(0);
    }
    10% { 
        opacity: 1;
        transform: translateY(-10px) scale(1);
    }
    90% { 
        opacity: 1;
        transform: translateY(-80px) scale(1);
    }
    100% { 
        opacity: 0;
        transform: translateY(-100px) scale(0);
    }
}

.floating-cards {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
}

.floating-card {
    background: rgba(30, 58, 138, 0.9);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 0 20px rgba(30, 58, 138, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--white);
    animation: floatCard 4s ease-in-out infinite;
    white-space: nowrap;
    min-width: 200px;
    justify-content: center;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.floating-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: cardShine 3s ease-in-out infinite;
}

.floating-card i {
    color: #ffffff;
    font-size: var(--font-size-xl);
    z-index: 1;
    position: relative;
}

.floating-card span {
    z-index: 1;
    position: relative;
}

@keyframes cardShine {
    0% { 
        left: -100%;
    }
    100% { 
        left: 100%;
    }
}

.card-1 {
    animation-delay: 0s;
    align-self: flex-start;
}

.card-2 {
    animation-delay: 1.5s;
    align-self: center;
}

.card-3 {
    animation-delay: 3s;
    align-self: flex-end;
}

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

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-base);
    justify-content: center;
}

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

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

.btn-outline {
    /* background: transparent;
    color: var(--white); */
    border: 2px solid var(--white);
    color: #fff;
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* 章节样式 */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.section-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* 功能特色区域 */
.features {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: var(--white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: 0 0 30px rgba(30, 58, 138, 0.1);
    border: 1px solid rgba(30, 58, 138, 0.2);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #1e3a8a, #3b82f6, #1e3a8a);
    background-size: 200% 100%;
    animation: gradientMove 3s ease-in-out infinite;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 40px rgba(30, 58, 138, 0.2);
    border-color: rgba(30, 58, 138, 0.4);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #1171e4, #3b82f6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    box-shadow: 0 0 20px rgba(30, 58, 138, 0.3);
    position: relative;
    z-index: 1;
}

.feature-icon i {
    font-size: var(--font-size-2xl);
    color: var(--white);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    position: relative;
    z-index: 1;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

@keyframes gradientMove {
    0%, 100% { 
        background-position: 0% 50%;
    }
    50% { 
        background-position: 100% 50%;
    }
}

/* 系统模块区域 */
.modules {
    padding: var(--spacing-3xl) 0;
    background: var(--white);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-2xl);
}

.module-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.module-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.module-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.module-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.module-icon i {
    font-size: var(--font-size-xl);
    color: var(--white);
}

.module-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--text-primary);
}

.module-content {
    margin-bottom: var(--spacing-xl);
}

.module-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.module-features {
    list-style: none;
}

.module-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.module-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

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

/* 关于学会区域 */
.about {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text .section-title {
    text-align: left;
    margin-bottom: var(--spacing-lg);
}

.about-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.highlight-item i {
    font-size: var(--font-size-xl);
    color: var(--primary-color);
    margin-top: var(--spacing-xs);
}

.highlight-item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.highlight-item p {
    color: var(--text-secondary);
    line-height: 1.5;
}

.about-image {
    display: flex;
    justify-content: center;
}

.about-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

/* 页脚 */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    /* margin-bottom: var(--spacing-2xl); */
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.footer-logo-img {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    object-fit: cover;
}

.footer-logo h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--white);
}

.footer-logo p {
    color: var(--gray-400);
    font-size: var(--font-size-sm);
}

.footer-section h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--white);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.contact-info p {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-400);
}

.contact-info i {
    color: var(--primary-color);
    width: 16px;
}

/* 二维码样式 */
.qr-codes {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.qr-code {
    width: 80px;
    height: 80px;
    border-radius: var(--radius);
    border: 2px solid var(--gray-600);
    transition: all 0.3s ease;
}

.qr-code:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.qr-item p {
    color: var(--gray-400);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--gray-400);
    font-size: var(--font-size-sm);
}

/* 登录页面特定样式 */
.login-page {
    min-height: 100vh;
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
}

/* 登录页面的二维码在桌面端独立定位 */
.login-page .floating-qrcode {
    position: absolute;
}

.login-page .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.login-page .navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.login-page main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 90px 0 30px 0;
    min-height: calc(100vh - 200px);
}

.login-container {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 30px;
    width: 100%;
    max-width: 550px;
    margin: 0 var(--spacing-md);
}

.login-header {
    text-align: center;
    margin-bottom: 10px;
}

.login-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.login-form {
    display: flex;
    flex-direction: column;
    /* gap: var(--spacing-lg); */
}

/* 登录方式切换按钮样式 */
.login-type-switch {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: var(--spacing-lg);
}

.login-type-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
}

.login-type-btn.active {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

/* 表单组样式 */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

/* 表单底部链接样式 */
.form-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
}

.form-footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.form-footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.form-footer span {
    color: var(--gray-400);
    margin: 0 var(--spacing-sm);
}

/* 基础输入框样式 */
.form-group input {
    padding: var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: var(--font-size-base);
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.login-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.login-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.login-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.login-btn:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
    transform: none;
}

.login-footer {
    text-align: center;
    margin-top: 10px;
}

.login-footer p {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.login-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.login-footer a:hover {
    text-decoration: underline;
}

/* 管理员登录页面样式 */
.admin-login {
    min-height: 100vh;
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
}

.admin-login .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.admin-login main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 90px 0 30px 0;
    min-height: calc(100vh - 200px);
}

/* 通用页面样式 */
.page-container {
    padding-top: 80px;
    min-height: 100vh;
    background: var(--bg-secondary);
}

/* 学生页面样式 */
.student-page {
    min-height: 100vh;
    background: var(--bg-secondary);
}

.student-page .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

/* 管理员页面样式 */
.admin-page {
    min-height: 100vh;
    background: var(--bg-secondary);
}

.admin-page .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .hero-features {
        order: -1;
        min-height: 300px;
    }
    
    .ai-robot .robot-container {
        width: 160px;
        height: 160px;
    }
    
    .floating-cards {
        flex-direction: row;
        justify-content: space-around;
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .floating-card {
        min-width: 150px;
        flex: 1;
        max-width: 200px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }
    
    .qr-codes {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .title-main {
        font-size: var(--font-size-4xl);
    }
    
    .title-sub {
        font-size: var(--font-size-2xl);
    }
    
    .ai-robot .robot-container {
        width: 120px;
        height: 120px;
    }
    
    .neural-network {
        opacity: 0.5;
    }
    
    .data-streams {
        opacity: 0.3;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .modules-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .qr-codes {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-lg);
    }
    
    .qr-code {
        width: 70px;
        height: 70px;
    }
    
    .floating-cards {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .floating-card {
        min-width: auto;
        width: 100%;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .hero-content {
        padding: 0 var(--spacing-md);
    }
    
    .title-main {
        font-size: var(--font-size-3xl);
    }
    
    .title-sub {
        font-size: var(--font-size-xl);
    }
    
    .title-ai {
        font-size: var(--font-size-base);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .feature-card,
    .module-card {
        padding: var(--spacing-lg);
    }
    
    .ai-robot .robot-container {
        width: 80px;
        height: 80px;
    }
}

/* 漂浮二维码样式 */
.floating-qrcode {
    width: 300px;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--gray-200);
    text-align: center;
    transition: all 0.3s ease;
}

/* 桌面端：固定在右侧 */
@media (min-width: 769px) {
    .floating-qrcode {
        position: fixed;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        z-index: 999;
        animation: qrcodeFloat 3s ease-in-out infinite;
    }

    .floating-qrcode:hover {
        animation-play-state: paused;
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
    }

    /* 登录页面的二维码样式调整 */
    .login-page .login-container {
        position: relative;
    }

    .login-page .floating-qrcode {
        position: fixed;
    }
}

.qrcode-image {
    width: 180px;
    height: 180px;
    border-radius: var(--radius);
    margin: 0 auto var(--spacing-md) auto;
    display: block;
    object-fit: contain;
}

.qrcode-title {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    margin: 0 auto var(--spacing-xs) auto;
    font-weight: 600;
    line-height: 1.5;
    max-width: 260px;
    text-align: center;
    white-space: nowrap;
}

.qrcode-deadline {
    font-size: var(--font-size-xs);
    color: var(--danger-color);
    margin: 0 auto var(--spacing-xs) auto;
    font-weight: 500;
    text-align: center;
}

.qrcode-note {
    font-size: 10px;
    color: var(--danger-color);
    margin: 0 auto;
    font-weight: 400;
    text-align: center;
    line-height: 1.4;
    max-width: 260px;
}

/* 浮动动画 */
@keyframes qrcodeFloat {
    0%, 100% {
        transform: translateY(-50%) translateY(0px);
    }
    50% {
        transform: translateY(-50%) translateY(-10px);
    }
}

/* 移动端：显示在按钮下方 */
@media (max-width: 768px) {
    .floating-qrcode {
        position: relative !important;
        width: 100%;
        max-width: 280px;
        margin: var(--spacing-xl) auto 0 auto;
        padding: var(--spacing-md);
    }

    .qrcode-image {
        width: 160px;
        height: 160px;
        margin: 0 auto var(--spacing-md) auto;
    }

    .qrcode-title {
        font-size: var(--font-size-sm);
        max-width: 100%;
        margin: 0 auto var(--spacing-xs) auto;
    }

    .qrcode-deadline {
        font-size: var(--font-size-xs);
        margin: 0 auto var(--spacing-xs) auto;
    }

    .qrcode-note {
        font-size: 10px;
        max-width: 100%;
    }

    /* 登录页面移动端样式 */
    .login-page .floating-qrcode {
        position: relative !important;
        margin-top: var(--spacing-lg);
    }
}