:root {
    --bg-dark: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --accent-green: #00e676;
    --accent-blue: #3b82f6;
    --accent-red: #ef4444;
    --shadow-color: rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background: #f8fafc;
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #f8fafc 100%);
}

.login-box {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 48px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 10px 40px var(--shadow-color);
}

.login-title {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 32px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.login-title::before {
    content: '🎮';
    font-size: 1.8rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: #ffffff;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), #2563eb);
    color: #ffffff;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-red), #dc2626);
    color: white;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.3);
}

.btn-secondary {
    background: #f1f5f9;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: #e2e8f0;
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.error-message {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 10px;
    padding: 12px 16px;
    margin-bottom: 20px;
    color: var(--accent-red);
    font-size: 0.875rem;
}

.success-message {
    background: rgba(0, 230, 118, 0.05);
    border: 1px solid rgba(0, 230, 118, 0.2);
    border-radius: 10px;
    padding: 12px 16px;
    margin-bottom: 20px;
    color: #10b981;
    font-size: 0.875rem;
}

.admin-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #ffffff;
    border-right: 1px solid var(--border-color);
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    padding: 24px;
    overflow-y: auto;
    box-shadow: 2px 0 10px var(--shadow-color);
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-title::before {
    content: '🎮';
    font-size: 1.5rem;
}

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

.sidebar-menu li {
    margin-bottom: 4px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 10px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: all 0.3s ease;
}

.sidebar-menu a:hover {
    background: #f1f5f9;
    color: var(--text-primary);
}

.sidebar-menu a.active {
    background: var(--accent-blue);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.main-content {
    flex: 1;
    padding: 32px;
    margin-left: 260px;
    min-height: 100vh;
    background: #f8fafc;
}

.content-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 32px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 8px 24px var(--shadow-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.form-textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: #ffffff;
    color: var(--text-primary);
    font-size: 0.9375rem;
    min-height: 180px;
    resize: vertical;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea::placeholder {
    color: var(--text-muted);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
}

.table th,
.table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.table th {
    background: #f8fafc;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tr:hover {
    background: #f8fafc;
}

.actions {
    display: flex;
    gap: 8px;
}

.actions .btn {
    padding: 8px 14px;
    font-size: 0.85rem;
    border-radius: 8px;
}

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

.pagination a {
    padding: 10px 16px;
    border-radius: 8px;
    background: #ffffff;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.pagination a:hover,
.pagination a.active {
    background: var(--accent-blue);
    color: #ffffff;
    border-color: var(--accent-blue);
}

.logout-link {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.logout-link a {
    color: var(--accent-red);
    font-size: 0.9375rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.logout-link a:hover {
    background: rgba(239, 68, 68, 0.05);
}

.home-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: all 0.3s ease;
}

.stat-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.15);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-blue), #2563eb);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--text-muted);
    margin-top: 10px;
}

@media (max-width: 768px) {
    .sidebar {
        width: 200px;
        padding: 16px;
    }

    .main-content {
        margin-left: 200px;
        padding: 20px;
    }

    .sidebar-title {
        font-size: 1rem;
        padding-bottom: 16px;
        margin-bottom: 24px;
    }

    .sidebar-menu a {
        padding: 10px 12px;
        font-size: 0.875rem;
    }

    .content-title {
        font-size: 1.25rem;
    }

    .card {
        padding: 20px;
    }

    .table {
        font-size: 0.85rem;
        overflow-x: auto;
        display: block;
    }

    .table th,
    .table td {
        padding: 10px;
    }

    .table th {
        font-size: 0.7rem;
    }

    .actions {
        flex-direction: column;
    }

    .login-box {
        padding: 32px;
    }

    .login-title {
        font-size: 1.25rem;
    }

    .home-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-card {
        padding: 20px;
    }

    .stat-value {
        font-size: 1.8rem;
    }
}

@media (max-width: 576px) {
    .sidebar {
        position: fixed;
        left: -200px;
        z-index: 100;
        transition: left 0.3s ease;
    }

    .sidebar.active {
        left: 0;
    }

    .main-content {
        margin-left: 0;
        padding: 16px;
    }

    .home-stats {
        grid-template-columns: 1fr;
    }

    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 48px;
        height: 48px;
        background: #ffffff;
        border: 1px solid var(--border-color);
        border-radius: 10px;
        color: var(--text-primary);
        cursor: pointer;
        margin-bottom: 20px;
        font-size: 1.5rem;
    }

    .mobile-menu-btn:hover {
        background: #f1f5f9;
    }
}