/* Modern Simple Theme - Clean Brainwave Colors */

:root {
    /* Modern Light Color Palette */
    --primary-bg: #fefefe;
    --secondary-bg: #ffffff;
    --card-bg: #ffffff;
    --text-primary: #374151;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border-color: #f3f4f6;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #22c55e;
    --danger-color: #f87171;
    --warning-color: #fbbf24;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition: all 0.2s ease-in-out;
}

/* Base Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 14px;
}

/* Navigation */
.navbar {
    background-color: var(--secondary-bg) !important;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
}

.navbar-brand {
    color: var(--text-primary) !important;
    font-weight: 700;
    font-size: 1.25rem;
    transition: var(--transition);
}

.navbar-brand:hover {
    color: var(--accent-color) !important;
}

.logo-img {
    height: 40px;
    width: auto;
    border-radius: var(--radius-md);
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md);
    transition: var(--transition);
    margin: 0 0.25rem;
}

.nav-link:hover {
    color: var(--text-primary) !important;
    background-color: #f8fafc;
}

.nav-link.active {
    color: var(--accent-color) !important;
    background-color: #eff6ff;
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
    font-weight: 600;
}

.card-header.bg-primary {
    background-color: var(--accent-color) !important;
    color: white !important;
    border-bottom: none;
}

.card-header.bg-success {
    background-color: var(--success-color) !important;
    color: white !important;
    border-bottom: none;
}

.card-header.bg-danger {
    background-color: var(--danger-color) !important;
    color: white !important;
    border-bottom: none;
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: #f8fafc;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
    color: var(--text-primary);
}

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

.btn-success:hover {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

/* List Groups */
.list-group {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.list-group-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    padding: 1.25rem;
}

.list-group-item:hover {
    background-color: #fafbfc;
    transform: translateX(4px);
}

.list-group-item:first-child {
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
}

.list-group-item:last-child {
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

.list-group-flush .list-group-item {
    border-radius: 0;
}

/* Friend Avatar */
.friend-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-color), var(--success-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 1.125rem;
    margin-right: 1rem;
    transition: var(--transition);
    position: relative;
}

.friend-avatar:hover {
    transform: scale(1.05);
}

/* Debt Leaderboard - Sad Emoji */
.leaderboard-item .friend-avatar::after {
    content: "😢";
    position: absolute;
    font-size: 1.5rem;
    background: none;
    color: initial;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.leaderboard-item .friend-avatar {
    background: linear-gradient(135deg, var(--danger-color), #ff6b6b) !important;
    color: transparent !important;
}

/* Good Friends - Happy Emoji */
.bg-light .friend-avatar::after {
    content: "😊";
    position: absolute;
    font-size: 1.5rem;
    background: none;
    color: initial;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.bg-light .friend-avatar {
    background: linear-gradient(135deg, var(--success-color), #4ade80) !important;
    color: transparent !important;
}

/* Badges */
.badge {
    font-weight: 500;
    border-radius: 9999px;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
}

.bg-primary,
.badge-primary {
    background-color: var(--accent-color) !important;
}

.bg-success,
.badge-success {
    background-color: var(--success-color) !important;
}

.bg-danger,
.badge-danger {
    background-color: var(--danger-color) !important;
}

.bg-warning,
.badge-warning {
    background-color: var(--warning-color) !important;
}

.badge-top-contributor {
    background-color: #d1fae5;
    color: var(--success-color);
}

.badge-info {
    background-color: #dbeafe;
    color: var(--accent-color);
}

/* Forms */
.form-control {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    background-color: var(--secondary-bg);
    color: var(--text-primary);
    padding: 0.75rem;
}

.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
    outline: none;
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Alerts */
.alert {
    border-radius: var(--radius-md);
    border: 1px solid;
    padding: 1rem;
}

.alert-success {
    background-color: #f0fdf4;
    border-color: #bbf7d0;
    color: #166534;
}

.alert-danger {
    background-color: #fef2f2;
    border-color: #fecaca;
    color: #dc2626;
}

.alert-info {
    background-color: #eff6ff;
    border-color: #bfdbfe;
    color: #1d4ed8;
}

.alert-warning {
    background-color: #fefce8;
    border-color: #fde68a;
    color: #a16207;
}

/* Tables */
.table {
    background-color: var(--card-bg);
}

.table th {
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-primary);
    background-color: #fafbfc;
}

.table td {
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.table-hover tbody tr:hover {
    background-color: #fafbfc;
}

/* Modals */
.modal-content {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    background-color: var(--secondary-bg);
}

.modal-body {
    background-color: var(--secondary-bg);
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--secondary-bg);
}

/* Leaderboard specific styles */
.leaderboard-item {
    transition: var(--transition);
}

.leaderboard-item:hover {
    background-color: #fafbfc;
    transform: translateX(4px);
}

.friend-detail-link {
    text-decoration: none;
    color: inherit;
}

.friend-detail-link:hover {
    color: inherit;
}

/* Login form */
.login-form {
    max-width: 400px;
    margin: 2rem auto;
}

.login-form .card {
    box-shadow: var(--shadow-lg);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.8rem;
    }
    
    .friend-avatar {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-bg: #0f172a;
        --secondary-bg: #1e293b;
        --card-bg: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        --border-color: #475569;
    }
    
    .navbar {
        background-color: var(--secondary-bg) !important;
    }
    
    .nav-link:hover {
        background-color: #475569;
    }
    
    .btn-secondary {
        background-color: #475569;
        color: var(--text-secondary);
        border-color: var(--border-color);
    }
    
    .list-group-item:hover {
        background-color: #475569;
    }
    
    .table th {
        background-color: #475569;
    }
    
    .table-hover tbody tr:hover {
        background-color: #475569;
    }
}