/* ========================================
   Jess' Coding Games - Dark Gaming Theme
   ======================================== */

/* CSS Variables for Theme */
:root {
    /* Primary Colors */
    --primary-green: #00ff88;
    --primary-cyan: #00d4ff;
    --primary-purple: #8b5cf6;

    /* Background Colors */
    --bg-dark-1: #0f0f1a;
    --bg-dark-2: #1a1a2e;
    --bg-dark-3: #16213e;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;

    /* Status Colors */
    --success-color: #22c55e;
    --warning-color: #eab308;
    --danger-color: #ef4444;
    --info-color: #3b82f6;

    /* Rank Colors */
    --gold: #fbbf24;
    --silver: #9ca3af;
    --bronze: #d97706;

    /* Borders */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-glow: rgba(0, 255, 136, 0.3);

    /* Shadows */
    --shadow-glow: 0 0 20px rgba(0, 255, 136, 0.2);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
}

/* Global Styles */
html, body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark-1) 0%, var(--bg-dark-2) 50%, var(--bg-dark-3) 100%);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Main Content Area */
.main-content {
    background: linear-gradient(135deg, var(--bg-dark-1) 0%, var(--bg-dark-2) 50%, var(--bg-dark-3) 100%);
    min-height: 100vh;
}

/* Smooth Transitions */
*, *::before, *::after {
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                box-shadow var(--transition-fast);
}

/* ========================================
   Sidebar Navigation - Already Dark
   ======================================== */
.sidebar {
    background: linear-gradient(180deg, var(--bg-dark-1) 0%, var(--bg-dark-2) 100%);
    width: 250px;
    min-height: 100vh;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
    border-right: 1px solid var(--border-color);
}

.sidebar .nav-link {
    color: var(--text-secondary);
    border-radius: 10px;
    padding: 12px 16px;
    margin: 4px 0;
    transition: all var(--transition-normal);
}

.sidebar .nav-link:hover {
    background: rgba(0, 255, 136, 0.1);
    color: var(--primary-green);
    transform: translateX(4px);
}

.sidebar .nav-link.active {
    background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
    color: var(--bg-dark-1);
    box-shadow: 0 4px 15px rgba(0, 255, 136, 0.4);
    font-weight: 600;
}

.sidebar .nav-link i {
    font-size: 1.2rem;
    width: 24px;
}

/* ========================================
   Cards - Dark Gaming Style
   ======================================== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow), var(--shadow-card);
}

.card-hover:hover {
    transform: translateY(-4px);
}

.card-header {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
}

.card-body {
    color: var(--text-primary);
}

/* ========================================
   Stats Cards - Gamified Dark
   ======================================== */
.stats-card {
    border-left: 4px solid var(--primary-green);
    position: relative;
    overflow: hidden;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(0, 255, 136, 0.05));
    transform: rotate(-12deg);
}

.stats-card.success {
    border-left-color: var(--success-color);
}

.stats-card.success::before {
    background: linear-gradient(45deg, transparent, rgba(34, 197, 94, 0.05));
}

.stats-card.warning {
    border-left-color: var(--warning-color);
}

.stats-card.warning::before {
    background: linear-gradient(45deg, transparent, rgba(234, 179, 8, 0.05));
}

.stats-card.danger {
    border-left-color: var(--danger-color);
}

.stats-card.danger::before {
    background: linear-gradient(45deg, transparent, rgba(239, 68, 68, 0.05));
}

.stats-card h2 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stats-card h6 {
    color: var(--text-muted) !important;
}

/* ========================================
   Page Headers
   ======================================== */
h1, h2, h3, h4, h5 {
    color: var(--text-primary);
}

h1 {
    font-weight: 700;
}

h1 i {
    color: var(--primary-green);
}

/* Page Title with Gradient */
.page-title {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========================================
   Rank Display - Gamified
   ======================================== */
.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.25rem;
}

.rank-1 {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: var(--bg-dark-1);
    box-shadow: 0 0 20px rgba(251, 191, 36, 0.5);
    animation: pulse-gold 2s infinite;
}

.rank-2 {
    background: linear-gradient(135deg, #9ca3af, #6b7280);
    color: var(--bg-dark-1);
    box-shadow: 0 0 15px rgba(156, 163, 175, 0.4);
}

.rank-3 {
    background: linear-gradient(135deg, #d97706, #b45309);
    color: white;
    box-shadow: 0 0 15px rgba(217, 119, 6, 0.4);
}

.rank-other {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

@keyframes pulse-gold {
    0%, 100% {
        box-shadow: 0 0 20px rgba(251, 191, 36, 0.5);
    }
    50% {
        box-shadow: 0 0 35px rgba(251, 191, 36, 0.8);
    }
}

/* ========================================
   Difficulty Badges
   ======================================== */
.badge-easy {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.3);
}

.badge-medium {
    background: linear-gradient(135deg, #eab308, #ca8a04);
    color: var(--bg-dark-1);
    box-shadow: 0 0 10px rgba(234, 179, 8, 0.3);
}

.badge-hard {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.3);
}

.badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.bg-secondary {
    background: rgba(255, 255, 255, 0.1) !important;
    color: var(--text-secondary);
}

.badge.bg-success {
    background: linear-gradient(135deg, var(--success-color), #16a34a) !important;
}

.badge.bg-primary {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan)) !important;
    color: var(--bg-dark-1);
}

.badge.bg-info {
    background: linear-gradient(135deg, var(--primary-cyan), #0ea5e9) !important;
    color: var(--bg-dark-1);
}

.badge.bg-warning {
    background: linear-gradient(135deg, var(--warning-color), #ca8a04) !important;
    color: var(--bg-dark-1);
}

.badge.bg-light {
    background: rgba(255, 255, 255, 0.1) !important;
    color: var(--text-primary) !important;
}

/* ========================================
   Tables - Dark Theme
   ======================================== */
.table {
    color: var(--text-primary);
    --bs-table-bg: transparent;
    --bs-table-hover-bg: rgba(0, 255, 136, 0.05);
}

.table thead th {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 12px 16px;
}

.table-light {
    --bs-table-bg: rgba(255, 255, 255, 0.02);
}

.table tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.table tbody tr:hover {
    background: rgba(0, 255, 136, 0.05);
}

.table tbody td {
    padding: 16px;
    border: none;
    vertical-align: middle;
}

.table a {
    color: var(--primary-green);
    text-decoration: none;
}

.table a:hover {
    color: var(--primary-cyan);
    text-decoration: underline;
}

/* Leaderboard Table */
.leaderboard-table {
    border-collapse: separate;
    border-spacing: 0 8px;
}

.leaderboard-table thead th {
    background: transparent;
    border: none;
}

.leaderboard-table tbody tr {
    background: var(--bg-card);
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.leaderboard-table tbody tr:hover {
    transform: scale(1.01);
    background: var(--bg-card-hover);
}

.leaderboard-table tbody td:first-child {
    border-radius: 12px 0 0 12px;
}

.leaderboard-table tbody td:last-child {
    border-radius: 0 12px 12px 0;
}

/* ========================================
   Forms - Dark Theme
   ======================================== */
.form-control, .form-select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 10px;
    padding: 12px 16px;
    transition: all var(--transition-normal);
}

.form-select {
    background-image: none;
}

.form-select option {
    background: var(--bg-dark-2);
    color: var(--text-primary);
    padding: 12px 16px;
}

.form-select option:hover,
.form-select option:focus,
.form-select option:checked {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: var(--bg-dark-1);
}

.form-control:focus, .form-select:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.15);
    color: var(--text-primary);
}

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

.form-label {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 8px;
}

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

.form-check-input {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--border-color);
}

.form-check-input:checked {
    background-color: var(--primary-green);
    border-color: var(--primary-green);
}

.form-check-label {
    color: var(--text-secondary);
}

.input-group-text {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.validation-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 4px;
}

/* ========================================
   Buttons - Gaming Style
   ======================================== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    border: none;
    color: var(--bg-dark-1);
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(0, 255, 136, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 255, 136, 0.5);
    background: linear-gradient(135deg, var(--primary-cyan), var(--primary-green));
    color: var(--bg-dark-1);
}

.btn-primary:disabled {
    opacity: 0.6;
    transform: none;
    box-shadow: none;
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #16a34a);
    border: none;
    color: white;
    box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(34, 197, 94, 0.5);
    background: linear-gradient(135deg, #16a34a, var(--success-color));
}

.btn-outline-primary {
    border: 2px solid var(--primary-green);
    color: var(--primary-green);
    background: transparent;
    border-radius: 10px;
}

.btn-outline-primary:hover {
    background: rgba(0, 255, 136, 0.1);
    border-color: var(--primary-green);
    color: var(--primary-green);
    transform: translateY(-2px);
}

.btn-outline-secondary {
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    background: transparent;
    border-radius: 10px;
}

.btn-outline-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.btn-outline-warning {
    border: 2px solid var(--warning-color);
    color: var(--warning-color);
    background: transparent;
}

.btn-outline-warning:hover {
    background: rgba(234, 179, 8, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.btn-outline-danger {
    border: 2px solid var(--danger-color);
    color: var(--danger-color);
    background: transparent;
}

.btn-outline-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.btn-group .btn {
    border-radius: 10px;
}

.btn-group .btn:not(:last-child) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.btn-group .btn:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

/* ========================================
   Alerts - Dark Theme
   ======================================== */
.alert {
    border-radius: 12px;
    border: 1px solid;
    background: rgba(255, 255, 255, 0.05);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
    color: #86efac;
}

.alert-warning {
    background: rgba(234, 179, 8, 0.1);
    border-color: rgba(234, 179, 8, 0.3);
    color: #fde047;
}

.alert-link {
    color: var(--primary-cyan);
}

/* ========================================
   Breadcrumbs - Dark Theme
   ======================================== */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 1rem;
}

.breadcrumb-item {
    color: var(--text-muted);
}

.breadcrumb-item a {
    color: var(--primary-green);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    color: var(--primary-cyan);
}

.breadcrumb-item.active {
    color: var(--text-secondary);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--text-muted);
}

/* ========================================
   Avatars - Gaming Style
   ======================================== */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-green);
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.3);
}

.avatar-lg {
    width: 80px;
    height: 80px;
}

.avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: var(--bg-dark-1);
    font-weight: 600;
    font-size: 1rem;
}

.avatar-placeholder.avatar-lg {
    font-size: 2rem;
}

/* Profile Avatar */
.rounded-circle.bg-primary {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan)) !important;
}

.rounded-circle.bg-secondary {
    background: rgba(255, 255, 255, 0.1) !important;
    border: 1px solid var(--border-color);
}

/* ========================================
   Progress & Streaks
   ======================================== */
.streak-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, #ef4444, #f97316);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 600;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
}

.streak-badge i {
    animation: flame 1s ease-in-out infinite;
}

@keyframes flame {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* ========================================
   List Groups - Dark Theme
   ======================================== */
.list-group {
    --bs-list-group-bg: transparent;
    --bs-list-group-border-color: var(--border-color);
}

.list-group-item {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.list-group-item:hover {
    background: rgba(0, 255, 136, 0.05);
}

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

/* ========================================
   Achievement Cards
   ======================================== */
.achievement-card {
    background: var(--bg-card);
    border: 2px solid var(--warning-color);
    border-radius: 16px;
    transition: all var(--transition-normal);
}

.achievement-card:hover {
    transform: scale(1.02);
    box-shadow: 0 0 25px rgba(251, 191, 36, 0.3);
}

.border-warning {
    border-color: var(--warning-color) !important;
}

/* ========================================
   Loading & Animations
   ======================================== */
.spinner-border {
    color: var(--primary-green);
}

.fade-in {
    animation: fadeIn var(--transition-normal);
}

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

.slide-up {
    animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Staggered animation for list items */
.stagger-item {
    animation: fadeIn 0.3s ease forwards;
    opacity: 0;
}

.stagger-item:nth-child(1) { animation-delay: 0.05s; }
.stagger-item:nth-child(2) { animation-delay: 0.1s; }
.stagger-item:nth-child(3) { animation-delay: 0.15s; }
.stagger-item:nth-child(4) { animation-delay: 0.2s; }
.stagger-item:nth-child(5) { animation-delay: 0.25s; }
.stagger-item:nth-child(6) { animation-delay: 0.3s; }
.stagger-item:nth-child(7) { animation-delay: 0.35s; }
.stagger-item:nth-child(8) { animation-delay: 0.4s; }
.stagger-item:nth-child(9) { animation-delay: 0.45s; }
.stagger-item:nth-child(10) { animation-delay: 0.5s; }

/* ========================================
   Motivational Messages
   ======================================== */
.motivation-card {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    color: var(--bg-dark-1);
    border-radius: 16px;
    padding: 20px;
    position: relative;
    overflow: hidden;
    font-weight: 600;
}

.motivation-card::after {
    content: '';
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
}

/* ========================================
   Definition Lists
   ======================================== */
dt {
    color: var(--text-muted);
    font-weight: 500;
}

dd {
    color: var(--text-primary);
}

/* ========================================
   Dropdown Menus
   ======================================== */
.dropdown-menu {
    background: var(--bg-dark-2);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
}

.dropdown-item {
    color: var(--text-secondary);
    padding: 10px 16px;
}

.dropdown-item:hover {
    background: rgba(0, 255, 136, 0.1);
    color: var(--primary-green);
}

/* ========================================
   Modals - Dark Theme
   ======================================== */
.modal-content {
    background: var(--bg-dark-2);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

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

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

.modal-title {
    color: var(--text-primary);
}

.btn-close {
    filter: invert(1);
}

/* ========================================
   Text Utilities
   ======================================== */
.text-muted {
    color: var(--text-muted) !important;
}

.text-primary {
    color: var(--primary-green) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.text-warning {
    color: var(--warning-color) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.border-gradient {
    border: 2px solid transparent;
    background: linear-gradient(var(--bg-dark-2), var(--bg-dark-2)) padding-box,
                linear-gradient(135deg, var(--primary-green), var(--primary-cyan)) border-box;
}

/* ========================================
   Custom Scrollbar
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark-1);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ========================================
   Responsive Adjustments
   ======================================== */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        min-height: auto;
    }

    .stats-card h2 {
        font-size: 2rem;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.cursor-pointer {
    cursor: pointer;
}

.glow-green {
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.4);
}

.glow-cyan {
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}

/* Icon colors */
.bi {
    color: inherit;
}

.text-primary .bi,
h1 .bi {
    color: var(--primary-green);
}

/* Links */
a {
    color: var(--primary-green);
}

a:hover {
    color: var(--primary-cyan);
}

/* Selection */
::selection {
    background: rgba(0, 255, 136, 0.3);
    color: var(--text-primary);
}