/* ========================================
   球速体育 - 全局样式表
   版本: 1.0.0
   作者: 球速体育设计团队
   说明: 暗色主题 · 毛玻璃 · 渐变 · 响应式
   ======================================== */

/* ----- 基础重置与全局变量 ----- */
:root {
    --bg-primary: #0b0e14;
    --bg-secondary: #0f1b2d;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --border-glass: rgba(255, 255, 255, 0.06);
    --text-primary: #e8edf2;
    --text-secondary: #b0c4de;
    --text-muted: #9aa8b9;
    --text-dim: #6a7a8e;
    --accent: #1a73e8;
    --accent-hover: #1557b0;
    --accent-light: rgba(26, 115, 232, 0.15);
    --gradient-hero: linear-gradient(135deg, #0f1b2d 0%, #1a2a4a 50%, #0d1a2b 100%);
    --gradient-text: linear-gradient(135deg, #fff, #90caf9);
    --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.3);
    --shadow-btn: 0 8px 24px rgba(26, 115, 232, 0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 40px;
    --radius-full: 50%;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-max: 1200px;
    --header-blur: 12px;
}

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

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

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition-normal), color var(--transition-normal);
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

input, textarea {
    font-family: inherit;
}

/* 暗色模式（默认即是暗色） */
body.dark-mode {
    --bg-primary: #0a0d12;
    --bg-secondary: #0c1628;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --border-glass: rgba(255, 255, 255, 0.04);
    --text-primary: #dce3ed;
    --text-secondary: #9aa8b9;
    --text-muted: #7a8a9e;
    --text-dim: #5a6a7e;
    --gradient-hero: linear-gradient(135deg, #080c14 0%, #0f1b2d 50%, #080c14 100%);
    --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ----- 容器与布局 ----- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* ----- 头部导航 ----- */
header {
    background: rgba(15, 20, 30, 0.9);
    backdrop-filter: blur(var(--header-blur));
    -webkit-backdrop-filter: blur(var(--header-blur));
    border-bottom: 1px solid var(--border-glass);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background var(--transition-normal);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
    flex-shrink: 0;
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.9;
}

.logo svg {
    width: 120px;
    height: 40px;
    display: block;
}

nav ul {
    display: flex;
    gap: 24px;
    align-items: center;
}

nav ul a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
    padding: 4px 0;
}

nav ul a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-normal);
    border-radius: 2px;
}

nav ul a:hover {
    color: var(--accent);
}

nav ul a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 4px 8px;
    transition: color var(--transition-fast);
}

.menu-toggle:hover {
    color: var(--accent);
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 4px 12px;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.3);
}

.search-box input {
    background: transparent;
    border: none;
    color: #fff;
    padding: 6px 8px;
    outline: none;
    width: 140px;
    font-size: 0.9rem;
}

.search-box input::placeholder {
    color: var(--text-dim);
}

.search-box button {
    background: none;
    border: none;
    color: #aaa;
    cursor: pointer;
    font-size: 1rem;
    padding: 4px;
    transition: color var(--transition-fast);
}

.search-box button:hover {
    color: var(--accent);
}

/* 暗色切换按钮 */
.dark-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 4px 8px;
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.dark-toggle:hover {
    color: var(--accent);
    transform: rotate(15deg);
}

/* ----- 面包屑 ----- */
.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-dim);
    padding: 12px 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--accent);
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.breadcrumb span {
    color: var(--text-dim);
}

/* ----- Hero 区域 ----- */
.hero {
    background: var(--gradient-hero);
    padding: 80px 0 60px;
    text-align: center;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    top: -40%;
    left: -20%;
    width: 160%;
    height: 160%;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.15) 0%, transparent 70%);
    pointer-events: none;
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 0.6;
    }
    100% {
        transform: translate(5%, 5%) scale(1.1);
        opacity: 1;
    }
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 24px;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero .btn-group {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero .btn {
    padding: 12px 32px;
    border-radius: var(--radius-xl);
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all var(--transition-normal);
    font-size: 1rem;
    line-height: 1.4;
}

.hero .btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.2);
}

.hero .btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn);
}

.hero .btn-outline {
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #fff;
    background: transparent;
}

.hero .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* ----- 通用标题 ----- */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 32px;
    text-align: center;
    color: var(--text-primary);
    position: relative;
}

.section-title span {
    color: var(--accent);
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent);
    margin: 12px auto 0;
    border-radius: 3px;
}

/* ----- 卡片网格 ----- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    border: 1px solid var(--border-glass);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.03), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-card);
    background: var(--bg-card-hover);
}

.card:hover::before {
    opacity: 1;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
    position: relative;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    position: relative;
    line-height: 1.7;
}

.card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    background: #1e2a3a;
    transition: transform var(--transition-normal);
}

.card:hover img {
    transform: scale(1.02);
}

/* ----- 文章列表 ----- */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.article-item {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), background var(--transition-normal);
}

.article-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.article-item h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.article-item:hover h4 {
    color: var(--accent);
}

.article-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

.article-item time {
    display: block;
    margin-top: 12px;
    color: var(--text-dim);
    font-size: 0.8rem;
}

/* ----- FAQ 模块 ----- */
.faq-item {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    margin-bottom: 12px;
    border: 1px solid rgba(255, 255, 255, 0.04);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.faq-item:hover {
    background: rgba(255, 255, 255, 0.06);
    transform: translateX(4px);
}

.faq-item h4 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 600;
}

.faq-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ----- HowTo 步骤 ----- */
.howto-step {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 16px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.howto-step:hover {
    background: rgba(255, 255, 255, 0.04);
    transform: translateX(4px);
}

.howto-step .step-num {
    background: var(--accent);
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
    font-size: 0.9rem;
}

.howto-step p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.howto-step p strong {
    color: var(--text-primary);
}

/* ----- 相关链接 ----- */
.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0;
}

.related-links a {
    background: var(--accent-light);
    color: #90caf9;
    padding: 6px 16px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.85rem;
    border: 1px solid rgba(26, 115, 232, 0.2);
    transition: all var(--transition-fast);
}

.related-links a:hover {
    background: rgba(26, 115, 232, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.15);
}

/* ----- 作者框 ----- */
.author-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.03);
    padding: 16px;
    border-radius: var(--radius-md);
    margin: 24px 0;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.author-box img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: #2a3a4a;
    flex-shrink: 0;
}

.author-box .info {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.author-box .info strong {
    color: var(--text-primary);
}

/* ----- 新闻滚动条 ----- */
.news-ticker {
    background: rgba(26, 115, 232, 0.08);
    padding: 10px 16px;
    border-radius: 30px;
    margin: 20px 0;
    display: flex;
    gap: 24px;
    overflow: hidden;
    position: relative;
}

.news-ticker span {
    white-space: nowrap;
    color: #90caf9;
    font-size: 0.85rem;
    animation: ticker 20s linear infinite;
}

@keyframes ticker {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-100%);
    }
}

/* ----- 页脚 ----- */
.footer {
    background: #080c14;
    padding: 48px 0 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer h4 {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 1rem;
    font-weight: 600;
}

.footer a {
    color: var(--text-dim);
    text-decoration: none;
    display: block;
    margin-bottom: 6px;
    font-size: 0.85rem;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer a:hover {
    color: #90caf9;
    padding-left: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--text-dim);
    font-size: 0.8rem;
    line-height: 1.8;
}

.footer-bottom a {
    color: var(--text-dim);
    display: inline;
    margin: 0 8px;
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: #90caf9;
}

.qr-code {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin: 16px 0;
}

.qr-code svg {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    background: #fff;
    padding: 6px;
    transition: transform var(--transition-fast);
}

.qr-code svg:hover {
    transform: scale(1.05);
}

/* ----- 返回顶部按钮 ----- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent);
    color: #fff;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    cursor: pointer;
    border: none;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
}

/* ----- 懒加载图片动画 ----- */
.lazy {
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.lazy.loaded {
    opacity: 1;
}

/* ----- 动画关键帧 ----- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ----- 滚动入场动画 (配合 IntersectionObserver 使用) ----- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ----- 响应式设计 ----- */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.4rem;
    }

    .section-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
        gap: 8px;
    }

    nav ul {
        display: none;
        flex-direction: column;
        width: 100%;
        background: rgba(15, 20, 30, 0.98);
        padding: 16px;
        border-radius: 16px;
        margin-top: 8px;
        gap: 12px;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        z-index: 999;
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    }

    nav ul.open {
        display: flex;
    }

    .menu-toggle {
        display: block;
    }

    .hero {
        padding: 60px 0 40px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero .btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .search-box input {
        width: 100px;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .article-list {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 24px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }

    .qr-code {
        flex-direction: column;
        align-items: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    .author-box {
        flex-direction: column;
        text-align: center;
    }

    .howto-step {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .hero p {
        font-size: 0.9rem;
    }

    .hero .btn-group {
        flex-direction: column;
        align-items: center;
    }

    .hero .btn {
        width: 100%;
        max-width: 280px;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .card {
        padding: 20px 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ----- 暗色模式微调 ----- */
body.dark-mode .card {
    border-color: rgba(255, 255, 255, 0.03);
}

body.dark-mode .article-item {
    border-color: rgba(255, 255, 255, 0.03);
}

body.dark-mode .faq-item {
    border-color: rgba(255, 255, 255, 0.03);
}

body.dark-mode .search-box {
    background: rgba(255, 255, 255, 0.05);
}

body.dark-mode .search-box:focus-within {
    background: rgba(255, 255, 255, 0.08);
}

/* ----- 无障碍与焦点样式 ----- */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-dim);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ----- 选中文本样式 ----- */
::selection {
    background: rgba(26, 115, 232, 0.3);
    color: #fff;
}

/* ----- 打印样式 ----- */
@media print {
    header,
    .back-to-top,
    .search-box,
    .dark-toggle,
    .news-ticker,
    .footer {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .hero {
        background: none !important;
        padding: 20px 0;
    }

    .hero h1 {
        -webkit-text-fill-color: #000;
        background: none;
    }
}