/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --success-hover: #059669;
    --error-color: #ef4444;
    --error-light: #fef2f2;
    --warning-color: #f59e0b;

    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --radius-sm: 6px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --transition: all 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.screen {
    min-height: 100vh;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-color);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background-color: var(--success-hover);
}

.btn-small {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-small svg {
    width: 16px;
    height: 16px;
}

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Form Elements */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="date"] {
    padding: 10px 14px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background-color: var(--card-bg);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Checkbox */
.checkbox-group {
    flex-direction: row;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* Error Message */
.error-message {
    color: var(--error-color);
    font-size: 13px;
    min-height: 20px;
}

/* Login Screen */
#login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: var(--card-bg);
    padding: 48px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #8b5cf6 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.logo svg {
    width: 36px;
    height: 36px;
    color: white;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Dashboard Screen */
#dashboard-screen {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-small {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #8b5cf6 100%);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-small svg {
    width: 20px;
    height: 20px;
    color: white;
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-badge {
    padding: 6px 12px;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    overflow-y: auto;
}

.sidebar h2 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 16px;
    padding: 0 12px;
}

.leaderboard-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: transparent;
    border: none;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    width: 100%;
}

.nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-item:hover {
    background: var(--bg-color);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-light);
    color: var(--primary-color);
}

/* Content Area */
.content-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Filters Panel */
.filters-panel {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}

.filters-panel h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.filters-actions {
    display: flex;
    gap: 12px;
}

/* Results Section */
.results-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.results-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.results-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.results-count {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 24px;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Empty State */
.empty-state,
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 24px;
    text-align: center;
}

.empty-state svg,
.error-state svg {
    width: 64px;
    height: 64px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.empty-state h4,
.error-state h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.empty-state p,
.error-state p {
    font-size: 14px;
    color: var(--text-secondary);
    max-width: 300px;
}

.error-state {
    color: var(--error-color);
}

.error-state svg {
    color: var(--error-color);
}

/* Table Container */
.table-container {
    flex: 1;
    overflow: auto;
    padding: 0 24px 24px;
}

#results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

#results-table thead {
    position: sticky;
    top: 0;
    background: var(--card-bg);
    z-index: 10;
}

#results-table th {
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

#results-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

#results-table tbody tr:hover {
    background-color: var(--bg-color);
}

#results-table tbody tr:last-child td {
    border-bottom: none;
}

/* Rank Badge */
.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-weight: 600;
    font-size: 13px;
}

.rank-1 {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: white;
}

.rank-2 {
    background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
    color: white;
}

.rank-3 {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    color: white;
}

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

/* User Cell */
.user-cell {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-name {
    font-weight: 500;
}

.user-email {
    font-size: 12px;
    color: var(--text-muted);
}

/* Number formatting */
.number-cell {
    font-variant-numeric: tabular-nums;
    text-align: right;
}

/* Score Badge */
.score-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius);
    font-weight: 600;
}

/* Value formatting */
.value-cell {
    font-weight: 500;
    color: var(--success-color);
}

/* Combined Leaderboard specific */
.metric-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.metric-primary {
    font-weight: 500;
}

.metric-secondary {
    font-size: 12px;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

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

    .filters-actions {
        flex-direction: column;
    }

    .btn-full-mobile {
        width: 100%;
    }

    .header {
        padding: 12px 16px;
    }

    .content-area {
        padding: 16px;
    }
}