:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

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

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

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

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

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

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

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 24px;
}

.card-header {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
}

.auth-title {
    font-size: 24px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.auth-switch {
    text-align: center;
    margin-top: 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

.auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-switch a:hover {
    text-decoration: underline;
}

.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.navbar-menu {
    display: flex;
    gap: 16px;
    align-items: center;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 24px;
}

.game-card {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.game-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.game-card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.game-card-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 12px;
}

.game-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.game-card-count {
    font-size: 14px;
    color: var(--text-secondary);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 20px;
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
}

.table th {
    background-color: #f9fafb;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
}

.table tr:not(:last-child) td {
    border-bottom: 1px solid var(--border-color);
}

.table td {
    font-size: 14px;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.pagination button {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.pagination button:hover {
    background-color: var(--bg-color);
}

.pagination button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 16px;
    padding: 24px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

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

.modal-title {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
}

.game-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 16px 24px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.game-info {
    display: flex;
    gap: 24px;
    align-items: center;
}

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

.game-stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.game-stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.timer {
    font-size: 32px;
    font-weight: 700;
    font-family: monospace;
    color: var(--primary-color);
}

.cards-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.game-card-item {
    width: 120px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    padding: 8px;
    transition: all 0.2s;
    user-select: none;
}

.game-card-item:hover:not(.eliminated):not(.selected) {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.game-card-item.selected {
    border-color: var(--primary-color);
    background-color: #eef2ff;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.game-card-item.eliminated {
    opacity: 0;
    pointer-events: none;
}

.game-card-item.correct {
    border-color: var(--success-color);
    background-color: #d1fae5;
}

.game-card-item.wrong {
    border-color: var(--danger-color);
    background-color: #fee2e2;
}

.result-modal {
    text-align: center;
}

.result-score {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-color);
    margin: 20px 0;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin: 24px 0;
}

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

.result-stat-value {
    font-size: 24px;
    font-weight: 600;
}

.result-stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.sidebar {
    width: 250px;
    background: white;
    min-height: calc(100vh - 73px);
    box-shadow: var(--shadow);
    padding: 20px 0;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-item {
    padding: 12px 24px;
    cursor: pointer;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.sidebar-item:hover {
    background-color: var(--bg-color);
}

.sidebar-item.active {
    background-color: #eef2ff;
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 500;
}

.main-content {
    flex: 1;
    padding: 24px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 700;
}

.admin-layout {
    display: flex;
    min-height: calc(100vh - 73px);
}

.search-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.search-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

.empty-state {
    text-align: center;
    padding: 48px;
    color: var(--text-secondary);
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 48px;
}

.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;
}

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

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.hidden {
    display: none !important;
}