/* ===================================
   足球赛事情报网 - 主样式文件
   =================================== */

/* CSS 变量定义 */
:root {
    /* 主色调 */
    --primary-color: #2ecc71;
    --primary-dark: #27ae60;
    --primary-light: #58d68d;
    
    /* 辅助色 */
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --warning-color: #f39c12;
    
    /* 中性色 */
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #95a5a6;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #1a252f;
    
    /* 边框和分割线 */
    --border-color: #e0e0e0;
    --border-light: #f0f0f0;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 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: 2rem;
    --font-size-4xl: 2.5rem;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* 通用按钮样式 */
.btn {
    display: inline-block;
    padding: 0.625rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    text-align: center;
    white-space: nowrap;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
}

.btn:focus {
    box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-outline-light {
    background: transparent;
    color: white;
    border-color: white;
}

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

.btn-large {
    padding: 0.875rem 2rem;
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
}

.btn-block {
    display: block;
    width: 100%;
}

/* 头部样式 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    gap: var(--spacing-md);
}

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

.logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-primary);
}

.logo-img {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 导航样式 */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    position: relative;
    display: block;
    padding: 0.5rem 0;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    transition: width var(--transition-base);
}

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

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

/* 头部操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-search {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.btn-search:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.auth-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* Section 通用样式 */
.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background: var(--bg-primary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 英雄横幅 */
.hero-section {
    position: relative;
    height: 600px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    margin-top: 70px;
    overflow: hidden;
}

.hero-slider {
    position: relative;
    height: 100%;
    width: 100%;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.hero-slide.active {
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: white;
    padding: var(--spacing-xl);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(0,0,0,0.4) 100%);
}

/* 直播指示器 */
.live-indicator {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 1rem;
    background: rgba(231, 76, 60, 0.1);
    border-radius: var(--radius-xl);
    margin-top: var(--spacing-sm);
}

.live-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

.live-text {
    color: var(--accent-color);
    font-weight: 600;
    font-size: var(--font-size-sm);
}