/* ===================================
   足球赛事分析平台 - 主样式文件
   =================================== */

/* CSS 变量定义 */
:root {
    /* 主题色彩方案 */
    --color-primary: #1a56db;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-secondary: #059669;
    --color-secondary-dark: #047857;
    --color-accent: #dc2626;
    --color-warning: #f59e0b;
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    
    /* 中性色 */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-dark: linear-gradient(135deg, #434343 0%, #000000 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    --font-serif: Georgia, Cambria, 'Times New Roman', Times, serif;
    --font-mono: Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    
    /* 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;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* 链接 */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-primary-dark);
}

/* 图片 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* SVG 图标 */
.icon {
    width: 1.25rem;
    height: 1.25rem;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* 按钮基础样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    white-space: nowrap;
    user-select: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
}

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

.btn-outline:hover:not(:disabled) {
    background-color: var(--color-primary);
    color: var(--color-white);
}

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

.btn-outline-light:hover:not(:disabled) {
    background-color: var(--color-white);
    color: var(--color-primary);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* 表单元素 */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-gray-700);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-input::placeholder {
    color: var(--color-gray-400);
}

.input-group {
    display: flex;
    gap: var(--spacing-sm);
}

.input-group .form-input {
    flex: 1;
}

.btn-code {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    background-color: var(--color-gray-100);
    color: var(--color-gray-700);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-code:hover {
    background-color: var(--color-gray-200);
}

/* 通用工具类 */
.hidden {
    display: none !important;
}

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

.text-primary {
    color: var(--color-primary);
}

.text-secondary {
    color: var(--color-secondary);
}

.text-accent {
    color: var(--color-accent);
}

/* 页面加载动画 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 3rem;
    height: 3rem;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-text {
    margin-top: var(--spacing-md);
    color: var(--color-white);
    font-size: 1.125rem;
}

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

/* 头部样式 */
.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.header-top {
    border-bottom: 1px solid var(--color-gray-200);
    background-color: var(--color-gray-50);
}

.header-top-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    font-size: 0.875rem;
}

.header-info {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--color-gray-600);
}

.data-update-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.status-dot {
    width: 0.5rem;
    height: 0.5rem;
    background-color: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-theme-toggle {
    padding: var(--spacing-xs);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-gray-600);
    transition: color var(--transition-base);
}

.btn-theme-toggle:hover {
    color: var(--color-primary);
}

.btn-theme-toggle .icon {
    width: 1.25rem;
    height: 1.25rem;
}

.user-menu {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-login, .btn-register {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-login {
    background: none;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-register {
    background-color: var(--color-primary);
    border: 2px solid var(--color-primary);
    color: var(--color-white);
}

.btn-register:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

/* 导航栏 */
.header-nav {
    padding: var(--spacing-md) 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    color: var(--color-gray-900);
}

.logo-icon {
    width: 3rem;
    height: 3rem;
    color: var(--color-primary);
}

.logo-svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--color-gray-500);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger {
    width: 1.5rem;
    height: 2px;
    background-color: var(--color-gray-700);
    border-radius: 2px;
    transition: all var(--transition-base);
}

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

.nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-gray-700);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-gray-100);
}

/* 主内容区 */
.main-content {
    min-height: calc(100vh - 600px);
}

/* Section 通用样式 */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background-color: var(--color-gray-50);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.title-icon {
    font-size: 2rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-600);
}

.section-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.filter-group {
    display: flex;
    gap: var(--spacing-sm);
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background-color: var(--color-white);
    cursor: pointer;
}

.btn-refresh {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-refresh:hover {
    background-color: var(--color-primary-dark);
}

.btn-refresh .icon {
    width: 1rem;
    height: 1rem;
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--color-white);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.hero-title .highlight {
    display: block;
    margin-bottom: var(--spacing-sm);
}

.hero-title .sub-title {
    font-size: 2rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-2xl);
}

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

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    opacity: 0.8;
}

.scroll-mouse {
    width: 1.5rem;
    height: 2.5rem;
    border: 2px solid var(--color-white);
    border-radius: 1rem;
    position: relative;
}

.scroll-mouse::before {
    content: '';
    position: absolute;
    top: 0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 0.25rem;
    height: 0.5rem;
    background-color: var(--color-white);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0%, 100% {
        opacity: 1;
        top: 0.5rem;
    }
    50% {
        opacity: 0.5;
        top: 1.5rem;
    }
}

.scroll-arrow {
    width: 0;
    height: 0;
    border-left: 0.5rem solid transparent;
    border-right: 0.5rem solid transparent;
    border-top: 0.5rem solid var(--color-white);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(0.5rem);
    }
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-0.25rem);
}

.back-to-top .icon {
    width: 1.5rem;
    height: 1.5rem;
}