/*
 * style.css - 基础全局样式
 * 包含所有页面共享的样式、变量和组件
 */

/* ============================
   1. 根变量 & 基础样式
   ============================ */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #95a5a6;
    --border-radius: 8px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    --transition-duration: 0.3s;
    --max-content-width: 100%;
    --content-padding: 15px;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 14px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

/* ============================
   2. 通用组件
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-duration) ease-in-out;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    background-color: #2980b9;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

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

.btn-play:hover {
    background-color: #27ae60;
}

/* ============================
   3. 布局组件
   ============================ */
header {
    background-color: white;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--dark-color);
    text-decoration: none;
    letter-spacing: -1px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav li {
    margin: 0 12px;
}

nav a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 600;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: all var(--transition-duration);
}

nav a:hover, nav li.active a {
    background-color: var(--primary-color);
    color: white;
}

.search-box {
    display: flex;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: box-shadow var(--transition-duration);
}

.search-box:focus-within {
    box-shadow: 0 0 0 2px var(--primary-color);
}

.search-box input {
    padding: 10px 15px;
    border: none;
    outline: none;
    width: 250px;
    background-color: var(--light-color);
}

.search-box button {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-duration);
}

.search-box button:hover {
    background-color: #2980b9;
}

footer {
    background-color: var(--dark-color);
    color: white;
    padding: 40px 0;
    margin-top: 50px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 25px;
}

.footer-links a {
    color: var(--light-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-duration);
}

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

/* ============================
   4. 响应式调整
   ============================ */
@media (min-width: 400px) {
    html {
        font-size: 15px;
    }
}

@media (min-width: 768px) {
    :root {
        --max-content-width: 1080px;
        --content-padding: 20px;
    }
    
    html {
        font-size: 16px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    header .container {
        flex-direction: column;
        padding: 15px;
        align-items: stretch;
    }
    
    .logo {
        text-align: center;
        margin-bottom: 10px;
    }
    
    nav {
        margin: 15px 0;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    nav li {
        margin: 0;
    }

    nav a {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .search-box {
        width: 100%;
        max-width: none;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 10px;
    }
}

/* 导航链接样式 */
.nav-link {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 600;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: all var(--transition-duration);
    position: relative;
}

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

/* 活动链接指示器 */
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .nav-link {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .nav-link.active::after {
        bottom: -5px;
    }
}

/* Legal Pages Styling */
.legal-page {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

.legal-page h2 {
    margin-top: 2rem;
    color: var(--dark-color);
}

.legal-page ul {
    padding-left: 1.5rem;
}

.effective-date {
    color: var(--gray-color);
    font-style: italic;
    margin-bottom: 2rem;
}

/* Contact Page Specific */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.info-card {
    background: white;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

@media (min-width: 768px) {
    .contact-grid {
        grid-template-columns: 2fr 1fr;
    }
}