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

:root {
    --primary: #e63946;
    --primary-dark: #c1121f;
    --primary-light: #ff6b6b;
    --secondary: #1d3557;
    --accent: #f4a261;
    --bg-main: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #6c757d;
    --text-light: #adb5bd;
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --gold: #ffd700;
    --silver: #c0c0c0;
    --bronze: #cd7f32;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== 头部样式 ===== */
.header {
    background: linear-gradient(135deg, var(--secondary) 0%, #2a5298 50%, var(--primary) 100%);
    color: #fff;
    padding: 40px 20px 30px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%);
    animation: headerPulse 8s ease-in-out infinite;
}

@keyframes headerPulse {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(5%, 5%); }
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 10px;
}

.logo-icon {
    font-size: 48px;
    animation: runBounce 1s ease-in-out infinite;
}

@keyframes runBounce {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-6px) rotate(-5deg); }
    75% { transform: translateY(-3px) rotate(5deg); }
}

.logo h1 {
    font-size: 2.8rem;
    font-weight: 900;
    letter-spacing: 4px;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
}

.tagline {
    font-size: 1rem;
    opacity: 0.85;
    margin-bottom: 16px;
    font-weight: 400;
    letter-spacing: 1px;
}

.update-info {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.update-icon {
    font-size: 1.1em;
}

/* ===== 分类标签导航 ===== */
.tab-nav {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 24px 20px 0;
    max-width: 900px;
    margin: 0 auto;
    flex-wrap: wrap;
    position: sticky;
    top: 0;
    background: var(--bg-main);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    border: 2px solid transparent;
    border-radius: 30px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--primary);
    border-color: var(--primary-light);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.35);
    transform: translateY(-2px);
}

.tab-icon {
    font-size: 1.2em;
}

/* ===== 主内容区 ===== */
.main-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 20px 60px;
}

/* ===== 统计概览卡片 ===== */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-card.highlight {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
}

.stat-number {
    font-size: 2rem;
    font-weight: 900;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    opacity: 0.75;
    margin-top: 4px;
    font-weight: 500;
}

/* ===== 排名列表 ===== */
.ranking-section {
    animation: fadeInUp 0.5s ease;
}

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

.runner-card {
    display: grid;
    grid-template-columns: 60px 90px 1fr auto;
    align-items: center;
    gap: 18px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 18px 22px;
    margin-bottom: 14px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.runner-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--border-color);
    transition: background 0.3s ease;
}

.runner-card:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.runner-card:hover::before {
    background: var(--primary);
}

.runner-card.rank-1 { border-left: 4px solid var(--gold); }
.runner-card.rank-1::before { background: var(--gold); }
.runner-card.rank-2 { border-left: 4px solid var(--silver); }
.runner-card.rank-2::before { background: var(--silver); }
.runner-card.rank-3 { border-left: 4px solid var(--bronze); }
.runner-card.rank-3::before { background: var(--bronze); }

/* 排名徽章 */
.rank-badge {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.15rem;
    flex-shrink: 0;
    background: var(--bg-main);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.rank-badge.gold {
    background: linear-gradient(135deg, #fff8dc, var(--gold));
    color: #8b6914;
    border-color: var(--gold);
    box-shadow: 0 2px 10px rgba(255, 215, 0, 0.3);
}

.rank-badge.silver {
    background: linear-gradient(135deg, #f0f0f0, var(--silver));
    color: #555;
    border-color: var(--silver);
    box-shadow: 0 2px 10px rgba(192, 192, 192, 0.3);
}

.rank-badge.bronze {
    background: linear-gradient(135deg, #ffe4c4, var(--bronze));
    color: #6b4423;
    border-color: var(--bronze);
    box-shadow: 0 2px 10px rgba(205, 127, 50, 0.3);
}

/* 照片区域 */
.runner-photo {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    border: 3px solid var(--border-color);
    transition: border-color 0.3s ease;
    object-fit: cover;
    background: linear-gradient(135deg, #e0e0e0, #f5f5f5);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.runner-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.runner-card:hover .runner-photo {
    border-color: var(--primary-light);
}

/* 跑者信息 */
.runner-info {
    min-width: 0;
}

.runner-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.runner-douyin {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 4px;
}

.douyin-icon {
    background: linear-gradient(135deg, #000, #161823);
    color: #25f4ee;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
}

.runner-race {
    font-size: 0.82rem;
    color: var(--text-light);
}

/* 成绩显示 */
.runner-time {
    text-align: right;
    flex-shrink: 0;
}

.time-value {
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
    letter-spacing: 1px;
    line-height: 1.2;
}

.time-label {
    font-size: 0.78rem;
    color: var(--text-light);
    margin-top: 2px;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--secondary);
    color: rgba(255, 255, 255, 0.8);
    padding: 30px 20px;
    text-align: center;
    margin-top: 40px;
}

.footer-inner {
    max-width: 800px;
    margin: 0 auto;
}

.footer p {
    font-size: 0.9rem;
    margin-bottom: 6px;
}

.footer-note {
    font-size: 0.8rem;
    opacity: 0.6;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.8rem;
        letter-spacing: 2px;
    }

    .logo-icon {
        font-size: 36px;
    }

    .tab-btn {
        padding: 10px 18px;
        font-size: 0.9rem;
    }

    .runner-card {
        grid-template-columns: 45px 65px 1fr;
        grid-template-rows: auto auto;
        gap: 10px 12px;
        padding: 14px 16px;
    }

    .rank-badge {
        width: 38px;
        height: 38px;
        font-size: 0.95rem;
        grid-row: span 2;
    }

    .runner-photo {
        width: 60px;
        height: 60px;
        font-size: 24px;
        grid-row: span 2;
    }

    .runner-info {
        grid-column: 3 / -1;
    }

    .runner-time {
        grid-column: 2 / -1;
        text-align: left;
        display: flex;
        align-items: baseline;
        gap: 8px;
    }

    .time-label {
        margin-top: 0;
    }

    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-number {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 30px 16px 24px;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .tab-nav {
        gap: 6px;
        padding: 16px 12px 12px;
    }

    .tab-btn {
        padding: 8px 14px;
        font-size: 0.82rem;
    }

    .main-content {
        padding: 16px 12px 40px;
    }

    .update-info {
        font-size: 0.8rem;
        padding: 6px 14px;
    }
}

/* ===== 动画效果 ===== */
.runner-card {
    animation: cardSlideIn 0.4s ease backwards;
}

.runner-card:nth-child(1) { animation-delay: 0.02s; }
.runner-card:nth-child(2) { animation-delay: 0.04s; }
.runner-card:nth-child(3) { animation-delay: 0.06s; }
.runner-card:nth-child(4) { animation-delay: 0.08s; }
.runner-card:nth-child(5) { animation-delay: 0.10s; }
.runner-card:nth-child(6) { animation-delay: 0.12s; }
.runner-card:nth-child(7) { animation-delay: 0.14s; }
.runner-card:nth-child(8) { animation-delay: 0.16s; }
.runner-card:nth-child(9) { animation-delay: 0.18s; }
.runner-card:nth-child(10) { animation-delay: 0.20s; }

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}