/* Stats Page Styles */

/* Hero Section */
.stats-hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.stats-hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.stats-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.stats-hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Stats Overview Cards */
.stats-overview {
    padding: 40px 0;
    margin-top: -30px;
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.stat-card.highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
}

.stat-card.highlight .stat-icon,
.stat-card.highlight .stat-value,
.stat-card.highlight .stat-label {
    color: white;
}

.stat-card.highlight .stat-icon {
    background: rgba(255, 255, 255, 0.2);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Problem Stats Section */
.problem-stats {
    padding: 60px 0;
    background: var(--bg-secondary);
}

.problem-stats h2 {
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.problem-stats h2 i {
    color: var(--primary);
    margin-right: 10px;
}

.problem-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.problem-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    transition: transform 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-4px);
}

.problem-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.problem-number {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
}

.problem-header h3 {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.problem-stats-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
}

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

.problem-stat .label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.problem-stat .value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.progress-bar-container {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* Leaderboard Section */
.leaderboard-section {
    padding: 60px 0;
}

.leaderboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 30px;
}

.leaderboard-header h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
}

.leaderboard-header h2 i {
    color: #fbbf24;
    margin-right: 10px;
}

.leaderboard-controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 14px;
    color: var(--text-secondary);
}

.search-box input {
    padding: 12px 16px 12px 42px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 0.9rem;
    width: 220px;
    transition: border-color 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
}

.sort-select {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

/* Leaderboard Table */
.leaderboard-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 16px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.leaderboard-table th {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.leaderboard-table td {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.leaderboard-table tbody tr {
    transition: background-color 0.2s ease;
}

.leaderboard-table tbody tr:hover {
    background: var(--bg-tertiary);
}

.leaderboard-table tbody tr:last-child td {
    border-bottom: none;
}

/* Rank styling */
.rank-col {
    width: 60px;
}

.rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
}

.rank.gold {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
}

.rank.silver {
    background: linear-gradient(135deg, #9ca3af, #6b7280);
    color: white;
}

.rank.bronze {
    background: linear-gradient(135deg, #d97706, #b45309);
    color: white;
}

.rank.normal {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

/* Total column */
.total-col {
    font-weight: 700;
}

.total-score {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
}

/* Status badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-badge.complete {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.status-badge.partial {
    background: rgba(251, 191, 36, 0.15);
    color: #f59e0b;
}

.status-badge.started {
    background: rgba(99, 102, 241, 0.15);
    color: #6366f1;
}

/* Score cells */
.score-cell {
    font-weight: 500;
}

.score-cell.full {
    color: #10b981;
}

.score-cell.partial {
    color: #f59e0b;
}

.score-cell.zero {
    color: var(--text-tertiary);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    display: none;
}

.empty-state.show {
    display: block;
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-tertiary);
    margin-bottom: 20px;
}

.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 10px;
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* Last Updated */
.last-updated {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.last-updated i {
    margin-right: 6px;
    color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .stats-hero h1 {
        font-size: 1.8rem;
    }

    .leaderboard-header {
        flex-direction: column;
        align-items: stretch;
    }

    .leaderboard-controls {
        flex-direction: column;
    }

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

    .leaderboard-table {
        font-size: 0.85rem;
    }

    .leaderboard-table th,
    .leaderboard-table td {
        padding: 12px 8px;
    }

    /* Hide some columns on mobile */
    .leaderboard-table th:nth-child(3),
    .leaderboard-table td:nth-child(3),
    .leaderboard-table th:nth-child(4),
    .leaderboard-table td:nth-child(4),
    .leaderboard-table th:nth-child(5),
    .leaderboard-table td:nth-child(5),
    .leaderboard-table th:nth-child(6),
    .leaderboard-table td:nth-child(6) {
        display: none;
    }
}

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

.stat-card,
.problem-card {
    animation: fadeInUp 0.5s ease forwards;
}

.stat-card:nth-child(1) { animation-delay: 0.1s; }
.stat-card:nth-child(2) { animation-delay: 0.2s; }
.stat-card:nth-child(3) { animation-delay: 0.3s; }
.stat-card:nth-child(4) { animation-delay: 0.4s; }

.problem-card:nth-child(1) { animation-delay: 0.1s; }
.problem-card:nth-child(2) { animation-delay: 0.2s; }
.problem-card:nth-child(3) { animation-delay: 0.3s; }
.problem-card:nth-child(4) { animation-delay: 0.4s; }