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

body {
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
}

.nav-logo i {
    margin-right: 10px;
    font-size: 1.8rem;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.nav-menu a:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主页面 */
main {
    margin-top: 80px;
}

.main-no-nav {
    margin-top: 0 !important;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
    position: relative;
    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 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease;
}

.hero-title i {
    margin-right: 1rem;
    color: #FFD700;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-buttons {
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease 0.4s both;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    margin: 0 0.5rem;
    border: none;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: #FFD700;
    color: #333;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

.btn-primary:hover {
    background: #FFC700;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
    transform: translateY(-3px);
}

.btn-demo {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
}

.btn-demo:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* 章节样式 */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
    position: relative;
}

.section-title i {
    margin-right: 1rem;
    color: #667eea;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 2px;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 20px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close {
    color: #aaa;
    float: right;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    z-index: 1;
}

.close:hover {
    color: #333;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

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

.fade-in-up {
    animation: fadeInUp 0.8s ease;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 80px;
        flex-direction: column;
        background-color: rgba(102, 126, 234, 0.95);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: 2rem 0;
        backdrop-filter: blur(10px);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
        margin: 0.5rem;
        display: block;
        width: fit-content;
        margin: 0.5rem auto;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 4rem 0;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .nav-logo {
        font-size: 1.2rem;
    }
    
    .nav-logo i {
        font-size: 1.4rem;
    }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 加载动画 */
.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.loading.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* 演示页面基础样式 */
.demo-page {
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.demo-header {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 1.5rem 0;
    position: relative;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    text-decoration: none;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    background: rgba(255,255,255,0.2);
    transition: all 0.3s ease;
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    z-index: 10;
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
}

.back-btn:hover {
    background: rgba(255,255,255,0.35);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.demo-header h1 {
    font-size: 2.2rem;
    margin: 1.5rem 0 0.5rem 0;
    text-align: left;
    padding-right: 150px;
    line-height: 1.2;
}

.demo-subtitle {
    font-size: 1rem;
    color: rgba(255,255,255,0.9);
    margin: 0;
    text-align: left;
    padding-right: 150px;
}

.header-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-right: 150px;
}

/* 更新信息样式 */
.update-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.9rem;
}

.update-label {
    color: rgba(255,255,255,0.8);
    font-weight: 600;
}

.update-time {
    color: white;
    font-weight: 700;
}

.update-status {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.8rem;
    background: rgba(255,255,255,0.2);
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.refresh-btn {
    background: rgba(255,255,255,0.2);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.refresh-btn:hover {
    background: rgba(255,255,255,0.3);
}