:root {
    --primary: #5b5fc7;
    --primary-hover: #4f52b2;
    --bg: #f3f2f1;
    --card-bg: #ffffff;
    --text: #242424;
    --text-muted: #616161;
    --border: #edebe9;
    --success: #107c41;
    --danger: #d13438;
    --accent: #5b5fc7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 8px;
    width: fit-content;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.tab {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-weight: 600;
}

.tab.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 2px 6px rgba(91, 95, 199, 0.3);
}

.admin-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.leaderboard-card {
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background: rgba(0, 0, 0, 0.03);
    padding: 1rem 1.5rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

td {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

tr:last-child:not(.details-row) td {
    border-bottom: none;
}

tr.clickable-row {
    cursor: pointer;
}

tr.clickable-row:hover {
    background: rgba(0, 0, 0, 0.02);
}

.details-row {
    background-color: var(--bg);
}

.details-row td {
    padding: 0;
    border-bottom: 2px solid var(--border);
}

.details-content {
    padding: 1.5rem;
    box-shadow: inset 0 4px 6px -4px rgba(0,0,0,0.1);
    background: #f1f5f9;
}

.details-table {
    width: 100%;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.details-table th {
    background: #e2e8f0;
    color: var(--text);
    padding: 0.75rem 1rem;
}

.details-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
}

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

tr:hover {
    background: rgba(0, 0, 0, 0.02);
}

.rank {
    font-weight: 800;
    width: 50px;
}

.rank-1 { color: #ffd700; }
.rank-2 { color: #c0c0c0; }
.rank-3 { color: #cd7f32; }

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

.user-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.user-group {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.metric-value {
    font-weight: 700;
    font-family: 'JetBrains Mono', monospace;
    color: var(--primary);
}

/* Admin Styles */
.admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.card h2 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

input, select {
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 0.75rem;
    border-radius: 8px;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    border-color: var(--primary);
}

button.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    background: var(--primary);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

button.btn:hover {
    background: var(--primary-hover);
}

button.btn-danger {
    background: var(--danger);
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.list-item:last-child {
    border-bottom: none;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}