/* 智习师 - AI自习室官方网站 样式表 */

/* 全局变量定义 */
:root {
    /* 主色调 */
    --primary-blue: #3B82F6;
    --secondary-orange: #F97316;
    --neutral-gray: #4B5563;
    --light-bg: #F9FAFB;
    --white: #FFFFFF;
    --dark: #1F2937;
    --light-gray: #E5E7EB;
    
    /* 渐变色 */
    --tech-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --hero-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-gradient: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    
    /* 阴影 */
    --shadow-light: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-heavy: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 字体 */
    --font-primary: 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-title: 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    
    /* 边界半径 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    /* 过渡效果 */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* 容器和布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-fluid {
    width: 100%;
    padding: 0 20px;
}

/* Grid 布局系统 */
.grid {
    display: grid;
    gap: 20px;
}

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

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 1000;
    transition: all var(--transition-normal);
}

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

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.75rem;
    font-weight: bold;
    color: var(--primary-blue);
    text-decoration: none;
    gap: 12px;
    transition: all var(--transition-normal);
}

.logo:hover {
    transform: translateY(-1px);
}

.logo-img {
    height: 45px;
    width: auto;
    border-radius: var(--radius-sm);
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    transition: all var(--transition-normal);
}

.logo:hover .logo-img {
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
    letter-spacing: 0.5px;
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

.logo-icon {
    width: 40px;
    height: 40px;
    margin-right: 10px;
    background: var(--tech-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-item a {
    text-decoration: none;
    color: var(--neutral-gray);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-item a.active {
    color: var(--primary-blue);
}

.nav-item a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: width var(--transition-normal);
}

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

.nav-item.highlight a {
    background: var(--secondary-orange);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-item.highlight a:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--neutral-gray);
    transition: all var(--transition-fast);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-outline {
    background: rgba(59, 130, 246, 0.08);
    color: #1e40af;
    border: 2px solid var(--primary-blue);
    position: relative;
    overflow: hidden;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(59, 130, 246, 0.1);
}

.btn-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
    transition: left 0.5s ease;
    z-index: 0;
}

.btn-outline:hover {
    background: linear-gradient(135deg, var(--primary-blue) 0%, #2563eb 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.btn-outline:hover::before {
    left: 100%;
}

.btn-outline span {
    position: relative;
    z-index: 1;
}

/* 专门为btn-large的btn-outline按钮设置橙色样式 */
.btn-outline.btn-large {
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.1) 0%, rgba(249, 115, 22, 0.15) 100%);
    color: white;
    border: 2px solid var(--secondary-orange);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-outline.btn-large::before {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.btn-outline.btn-large:hover {
    background: linear-gradient(135deg, var(--secondary-orange) 0%, #ea580c 100%);
    color: white;
    box-shadow: 0 10px 25px rgba(249, 115, 22, 0.3);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* 按钮扫光效果 */
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

/* Hero 区域样式 */
.hero {
    position: relative;
    min-height: 100vh;
    background: var(--hero-gradient);
    display: flex;
    align-items: center;
    color: white;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="0" cy="0" r="1"><stop offset="0%" stop-color="rgba(255,255,255,0.1)"/><stop offset="100%" stop-color="rgba(255,255,255,0)"/></radialGradient></defs><g fill="url(%23a)"><circle cx="200" cy="300" r="100"/><circle cx="800" cy="200" r="150"/><circle cx="600" cy="700" r="120"/><circle cx="100" cy="800" r="80"/></g></svg>');
    animation: float 20s ease-in-out infinite;
}

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

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    0% { text-shadow: 0 0 20px rgba(255, 255, 255, 0.5); }
    100% { text-shadow: 0 0 40px rgba(255, 255, 255, 0.8), 0 0 60px rgba(59, 130, 246, 0.5); }
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 章节和卡片样式 */
.section {
    padding: 5rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--dark);
    margin-bottom: 1rem;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--tech-gradient);
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--neutral-gray);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.card {
    background: var(--card-gradient);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-light);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--tech-gradient);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
}

.card:hover::before {
    transform: translateX(0);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--tech-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    position: relative;
}

.card-icon::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--tech-gradient);
    border-radius: 50%;
    z-index: -1;
    filter: blur(8px);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.card:hover .card-icon::after {
    opacity: 0.7;
}

.card-title {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.card-text {
    color: var(--neutral-gray);
    line-height: 1.6;
}

/* 统计数据样式 */
.stats {
    background: var(--dark);
    color: white;
    padding: 4rem 0;
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.stats-container {
    position: relative;
    z-index: 2;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--secondary-orange);
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

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

.form-select {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor"><path fill-rule="evenodd" d="M5.293 7.293a1 1 0 011.414 0L10 10.586l3.293-3.293a1 1 0 111.414 1.414l-4 4a1 1 0 01-1.414 0l-4-4a1 1 0 010-1.414z" clip-rule="evenodd"/></svg>');
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1.5rem;
    padding-right: 2.5rem;
    appearance: none;
}

/* 页脚样式 */
.footer {
    background: var(--dark);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--secondary-orange);
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--secondary-orange);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* 浮动咨询按钮 */
.floating-contact {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
}

.floating-btn {
    width: 60px;
    height: 60px;
    background: var(--secondary-orange);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    text-decoration: none;
    box-shadow: var(--shadow-heavy);
    transition: all var(--transition-normal);
    animation: pulse 2s infinite;
    cursor: pointer;
}

.floating-btn:hover {
    transform: scale(1.1);
    background: #ea580c;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(249, 115, 22, 0); }
    100% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0); }
}

/* 时间轴样式 */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--tech-gradient);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
}

.timeline-item:nth-child(odd) {
    flex-direction: row-reverse;
}

.timeline-content {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-light);
    width: calc(50% - 30px);
    position: relative;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: 60px;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: 60px;
}

.timeline-date {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-blue);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: bold;
    white-space: nowrap;
}

.timeline-icon {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 20px;
    background: var(--secondary-orange);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: var(--shadow-light);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow-medium);
        gap: 1rem;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: row !important;
    }
    
    .timeline-content {
        width: calc(100% - 60px);
        margin-left: 60px !important;
        margin-right: 0 !important;
    }
    
    .timeline-date {
        left: 20px;
        transform: none;
    }
    
    .timeline-icon {
        left: 20px;
        transform: translateX(-50%);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .floating-contact {
        bottom: 20px;
        right: 20px;
    }
    
    .floating-btn {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.hidden { display: none; }
.visible { display: block; }

/* 打印样式 */
@media print {
    .navbar,
    .floating-contact {
        display: none;
    }
    
    .hero {
        min-height: auto;
        page-break-inside: avoid;
    }
}

/* 地图相关动画效果 */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

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

@keyframes ring {
    0%, 100% {
        transform: rotate(0deg);
    }
    10%, 30% {
        transform: rotate(-10deg);
    }
    20% {
        transform: rotate(10deg);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
        opacity: 0.6;
    }
    50% {
        transform: translateY(-20px);
        opacity: 1;
    }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.map-clicked {
    animation: mapShake 0.3s ease-in-out;
}

@keyframes mapShake {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.02) rotate(1deg); }
    50% { transform: scale(1.03); }
    75% { transform: scale(1.02) rotate(-1deg); }
}