:root {
    --primary-bg: #fdfcf0; /* 米白色背景 */
    --card-bg: #ffffff;    /* 純白卡片 */
    --accent-blue: #2563eb;
    --accent-hover: #1d4ed8;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --border-color: #e5e7eb;
    --transition-speed: 0.3s;
}

body {
    background-color: var(--primary-bg);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    overflow-x: hidden;
}

/* 頁面進入動畫 */
main {
    animation: fadeInUp 0.5s ease-out forwards;
    will-change: opacity, transform;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 卡片優化 */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.card-body {
    padding: 10px !important; /* 強制執行 10px 內間距 */
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 700;
    padding: 10px 15px !important;
}

/* 統計卡片 */
.stat-card {
    padding: 10px !important;
    text-align: center;
}

/* 按鈕動畫 */
.btn {
    border-radius: 8px;
    padding: 0.5rem 1.25rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
}

.btn:active {
    transform: scale(0.95);
}

/* 導覽列優化 */
.navbar {
    background-color: var(--card-bg) !important;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.navbar-brand {
    color: var(--accent-blue) !important;
    font-weight: 800;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--accent-blue) !important;
}

/* 頂部加載條 */
#nprogress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--accent-blue);
    z-index: 9999;
    transition: width 0.4s ease;
}

/* 統計卡片 */
.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-blue);
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

/* 表格優化 */
.table {
    border-collapse: separate;
    border-spacing: 0 8px;
}

.table thead th {
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    padding: 0 1rem;
}

.table tbody tr {
    background-color: var(--card-bg);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.table-hover tbody tr:hover {
    background-color: #f9fafb !important;
}

.badge-item {
    background: #f3f4f6;
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}

.leaderboard-row {
    border-bottom: 1px solid var(--border-color);
}