/* DevGainx Practice Arena Specific CSS Styling */
/* Designed as an ultra-premium, high-contrast light theme with rich micro-animations. */

:root {
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --glass-border: rgba(17, 24, 39, 0.06);
    --glass-glow: rgba(99, 102, 241, 0.05);
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    --accent: #10b981;
    
    --easy: #10b981;
    --easy-hover: #059669;
    --easy-bg: rgba(16, 185, 129, 0.09);
    
    --medium: #d97706;
    --medium-hover: #b45309;
    --medium-bg: rgba(217, 119, 6, 0.09);
    
    --hard: #ef4444;
    --hard-hover: #dc2626;
    --hard-bg: rgba(239, 68, 68, 0.09);
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-dim: #334155;
    
    --shadow-premium: 0 10px 30px -10px rgba(99, 102, 241, 0.12), 0 1px 3px rgba(0, 0, 0, 0.02);
    --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.03), 0 1px 2px rgba(0, 0, 0, 0.01);
    --shadow-hover: 0 20px 40px -15px rgba(99, 102, 241, 0.2);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* Glassmorphism Card Utility overrides */
.card-glass {
    background: rgba(255, 255, 255, 0.85) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    border: 1px solid var(--glass-border) !important;
    box-shadow: var(--shadow-soft) !important;
}

/* Preloader custom style overrides */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #ffffff;
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease;
}

.loader-content {
    text-align: center;
}

.glow-orbit {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: var(--primary);
    border-right-color: #ec4899;
    animation: spin-loader 1s linear infinite;
    margin: 0 auto 20px auto;
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.2);
}

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

.loader-text {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-main) !important;
    margin-bottom: 5px;
}

.loader-subtext {
    color: var(--text-muted) !important;
    font-size: 0.9rem;
}

/* Hero Section */
.practice-header {
    padding: 9rem 5% 4rem 5%;
    text-align: center;
    position: relative;
    z-index: 10;
}

.practice-badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: var(--primary-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--primary);
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.06);
}

.practice-header h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 1rem;
}

.text-gradient {
    background: linear-gradient(135deg, var(--text-main) 10%, var(--primary) 70%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-dim);
    max-width: 650px;
    margin: 0 auto 3rem auto;
    line-height: 1.6;
}

/* Stats Container Grid (Premium 4-Column Layout) */
.stats-grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto 1.5rem auto;
}

.stat-glass-card {
    background: #ffffff;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-soft);
    border-radius: 20px;
    padding: 1.5rem 1.25rem;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    transition: var(--transition-normal);
}

.stat-card-icon {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: #f1f5f9;
    border-radius: 12px;
    transition: var(--transition-fast);
}

.stat-glass-card:hover .stat-card-icon {
    background: var(--primary-light);
    color: var(--primary);
    transform: scale(1.05);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 850;
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: -1px;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.stat-subtext {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-dim);
}

/* Premium Card hover glowing effect */
.hover-glow:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.25);
    box-shadow: var(--shadow-premium);
}

/* Streak Card Pulse Fire Animation */
.streak-card .fire-icon {
    background: rgba(249, 115, 22, 0.1);
    color: #f97316;
}

.streak-card:hover .fire-icon {
    background: rgba(249, 115, 22, 0.2);
    animation: fire-pulse 1s infinite alternate ease-in-out;
}

@keyframes fire-pulse {
    0% { transform: scale(1) rotate(0deg); filter: drop-shadow(0 0 2px #f97316); }
    100% { transform: scale(1.15) rotate(5deg); filter: drop-shadow(0 0 8px #ea580c); }
}

.header-action-row {
    margin-top: 1.5rem;
}

.leaderboard-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0.75rem 1.75rem;
    background: linear-gradient(135deg, var(--primary), #ec4899);
    border: none;
    border-radius: 14px;
    color: #fff;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.15);
    transition: var(--transition-normal);
}

.leaderboard-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
    background: linear-gradient(135deg, var(--primary-hover), #db2777);
}

/* Controls Panel Styling */
.practice-main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5% 8rem 5%;
}

/* Categories Tabs Horizontal Slider Section */
.categories-tabs-section {
    margin-bottom: 2rem;
    width: 100%;
}

.scroll-chips-wrap {
    position: relative;
    display: flex;
    align-items: center;
    background: #ffffff;
    border: 1px solid var(--glass-border);
    border-radius: 18px;
    padding: 0.4rem;
    box-shadow: var(--shadow-soft);
}

.arrow-btn {
    background: #ffffff;
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.arrow-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: rgba(99, 102, 241, 0.2);
}

.scroll-chips {
    display: flex !important;
    flex-wrap: nowrap !important;
    gap: 0.5rem;
    overflow-x: auto !important;
    padding: 0.25rem 0.5rem;
    width: 100%;
    scrollbar-width: none !important; /* Firefox */
    -ms-overflow-style: none !important;
    scroll-behavior: smooth;
}

.scroll-chips::-webkit-scrollbar {
    display: none !important; /* Chrome/Safari */
}

.filter-chip {
    background: #f8fafc !important;
    border: 1px solid var(--glass-border) !important;
    color: var(--text-dim) !important;
    padding: 0.6rem 1.1rem;
    border-radius: 12px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    white-space: nowrap !important;
    flex-shrink: 0 !important;
    display: flex;
    align-items: center;
    gap: 6px;
}

.filter-chip:hover {
    background: #f1f5f9 !important;
    color: var(--text-main) !important;
    transform: translateY(-1px);
}

.filter-chip.active {
    background: var(--primary) !important;
    color: #ffffff !important;
    border-color: var(--primary) !important;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2) !important;
}

/* Controls bar main row */
.controls-panel {
    border-radius: 24px;
    padding: 1.5rem;
    margin-bottom: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    position: relative;
    background: #ffffff !important;
}

.controls-main-row {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.search-bar-wrap {
    position: relative;
    display: flex;
    align-items: center;
    flex-grow: 1;
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    pointer-events: none;
}

#practiceSearch {
    width: 100%;
    background: #f8fafc !important;
    border: 1.5px solid rgba(99, 102, 241, 0.08) !important;
    border-radius: 16px;
    padding: 0.95rem 1.5rem 0.95rem 3.25rem;
    color: var(--text-main) !important;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-normal);
}

#practiceSearch::placeholder {
    color: var(--text-muted) !important;
}

#practiceSearch:focus {
    border-color: var(--primary) !important;
    background: #ffffff !important;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.08) !important;
}

.controls-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-shrink: 0;
}

.controls-btn-action {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #f8fafc;
    border: 1.5px solid rgba(99, 102, 241, 0.08);
    color: var(--text-dim);
    padding: 0.9rem 1.25rem;
    border-radius: 16px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.controls-btn-action:hover, .controls-btn-action.active {
    background: var(--primary-light);
    color: var(--primary);
    border-color: rgba(99, 102, 241, 0.2);
}

/* Sorting selector */
.sort-dropdown-wrap {
    position: relative;
}

.sort-select-dropdown {
    background: #f8fafc;
    border: 1.5px solid rgba(99, 102, 241, 0.08);
    color: var(--text-dim);
    padding: 0.9rem 2.25rem 0.9rem 1.25rem;
    border-radius: 16px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    transition: var(--transition-fast);
}

.sort-dropdown-wrap::after {
    content: '▾';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.sort-select-dropdown:hover, .sort-select-dropdown:focus {
    border-color: var(--primary);
    background: #ffffff;
}

/* Advanced filters collapsible block */
.advanced-filters-panel {
    border-top: 1px solid var(--glass-border);
    padding-top: 1.25rem;
    animation: slideDown var(--transition-normal);
}

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

.bottom-filters-row {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.filter-item-wrap {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.filter-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted) !important;
    white-space: nowrap;
}

.toggle-buttons {
    display: flex;
    background: #f1f5f9;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 3px;
}

.toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1.1rem;
    border-radius: 9px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
}

.toggle-btn:hover {
    color: var(--text-main);
}

.toggle-btn.active {
    background: #ffffff;
    color: var(--text-main);
    box-shadow: var(--shadow-sm);
}

/* Specific Active Colors for Difficulty and Status Toggles */
.toggle-btn.text-easy.active { background: var(--easy-bg); color: var(--easy); }
.toggle-btn.text-medium.active { background: var(--medium-bg); color: var(--medium); }
.toggle-btn.text-hard.active { background: var(--hard-bg); color: var(--hard); }
.toggle-btn.text-solved.active { background: var(--easy-bg); color: var(--easy); }
.toggle-btn.text-attempted.active { background: var(--medium-bg); color: var(--medium); }
.toggle-btn.text-unattempted.active { background: rgba(100, 116, 139, 0.1); color: var(--text-muted); }

/* Challenges Section */
.section-title-row {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-title-row h2 {
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-main);
}

.count-badge {
    background: var(--primary-light) !important;
    border: 1px solid rgba(99, 102, 241, 0.2) !important;
    color: var(--primary) !important;
    font-size: 0.82rem;
    padding: 0.2rem 0.75rem;
    border-radius: 30px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
}

/* Premium LeetCode Table Styles */
.table-responsive-wrapper {
    border-radius: 20px;
    overflow: hidden;
    background: #ffffff !important;
    box-shadow: var(--shadow-soft) !important;
    margin-bottom: 2rem;
}

.leetcode-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.leetcode-table thead {
    background: #f8fafc;
    border-bottom: 1px solid var(--glass-border);
}

.leetcode-table th {
    padding: 1.1rem 1.5rem;
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.leetcode-table tbody tr {
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition-fast);
}

/* Active Row highlighting */
.leetcode-table tbody tr:hover {
    background: #f8fafc;
    box-shadow: inset 4px 0 0 var(--primary);
}

.leetcode-table td {
    padding: 1.2rem 1.5rem;
    vertical-align: middle;
}

/* Column sizes */
.col-status { width: 8%; text-align: center; }
.col-title { width: 45%; }
.col-difficulty { width: 14%; }
.col-acceptance { width: 13%; }
.col-xp { width: 10%; }
.col-lock { width: 5%; text-align: center; }
.col-favorite { width: 5%; text-align: center; }

/* Status cell styling */
.status-indicator-table {
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Row titles and active links */
.row-title-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.row-num {
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    width: 36px;
    text-align: right;
    flex-shrink: 0;
    margin-right: 4px;
}

.row-title-link {
    font-weight: 600;
    color: var(--text-main);
    transition: var(--transition-fast);
    cursor: pointer;
}

.row-title-link:hover {
    color: var(--primary);
}

.row-category-tag {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: #f1f5f9;
    color: var(--text-muted);
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    margin-left: 8px;
}

/* Difficulty Badges */
.diff-badge-table {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    padding: 0.35rem 0.75rem;
    border-radius: 8px;
    display: inline-block;
}

.diff-badge-table.easy { background: var(--easy-bg); color: var(--easy); }
.diff-badge-table.medium { background: var(--medium-bg); color: var(--medium); }
.diff-badge-table.hard { background: var(--hard-bg); color: var(--hard); }

/* Acceptance rate text styling */
.acceptance-rate {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    color: var(--text-dim);
}

/* XP Pill Table */
.xp-pill-table {
    background: rgba(99, 102, 241, 0.06);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.15);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    display: inline-block;
}

/* Lock icons & bookmarks */
.lock-btn, .fav-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1.15rem;
    transition: var(--transition-fast);
    outline: none;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

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

.lock-btn.unlocked {
    color: var(--easy);
}

.lock-btn.unlocked:hover {
    background: var(--easy-bg);
}

.fav-btn:hover {
    color: #eab308;
    background: rgba(234, 179, 8, 0.08);
    transform: scale(1.1);
}

.fav-btn.active {
    color: #eab308;
    animation: star-pop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes star-pop {
    50% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

/* Skeleton Loading Screens */
.skeleton-row {
    background: transparent !important;
}

.skeleton-cell {
    position: relative;
    overflow: hidden;
    height: 48px;
}

.skeleton-bar {
    height: 16px;
    background: #e2e8f0;
    border-radius: 6px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

.skeleton-shimmer {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    animation: shimmer-effect 1.5s infinite;
}

@keyframes shimmer-effect {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Pagination container styles */
.pagination-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #ffffff;
    padding: 1rem 1.5rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-soft);
    margin-bottom: 2rem;
}

.pagination-info {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pag-btn {
    background: #f8fafc;
    border: 1px solid var(--glass-border);
    color: var(--text-dim);
    font-weight: 700;
    font-size: 0.82rem;
    padding: 0.5rem 1rem;
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.pag-btn:hover:not(:disabled) {
    background: var(--primary-light);
    color: var(--primary);
    border-color: rgba(99, 102, 241, 0.2);
}

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

.pag-pages {
    display: flex;
    gap: 0.25rem;
}

.pag-num {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    border: none;
    background: transparent;
    color: var(--text-dim);
    transition: var(--transition-fast);
}

.pag-num:hover:not(.active) {
    background: #f1f5f9;
}

.pag-num.active {
    background: var(--primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.pagination-limit {
    flex-shrink: 0;
}

.pag-select {
    background: #f8fafc;
    border: 1.5px solid rgba(99, 102, 241, 0.08);
    color: var(--text-dim);
    padding: 0.4rem 1rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: #ffffff;
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-soft);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-muted);
}

/* Premium Upgrade Modal CSS */
.premium-modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    animation: fadeIn var(--transition-fast);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.premium-modal-card {
    background: #ffffff;
    border: 1px solid rgba(99, 102, 241, 0.15) !important;
    border-radius: 28px;
    width: 90%;
    max-width: 520px;
    padding: 3rem 2.5rem;
    box-shadow: 0 25px 50px -12px rgba(99, 102, 241, 0.25) !important;
    position: relative;
    text-align: center;
}

.animate-scale {
    animation: scaleIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scaleIn {
    from { transform: scale(0.85); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.premium-modal-close {
    position: absolute;
    top: 1.25rem; right: 1.25rem;
    background: none; border: none;
    font-size: 1.75rem; color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    outline: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.premium-modal-close:hover {
    color: var(--text-main);
    background: #f1f5f9;
}

.premium-crown {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    animation: floatCrown 3s infinite ease-in-out;
}

@keyframes floatCrown {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(4deg); }
}

.premium-modal-card h2 {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.premium-tagline {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.premium-features-list {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 2.25rem;
}

.premium-feature-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.feature-bullet {
    background: var(--easy-bg);
    color: var(--easy);
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 900;
    flex-shrink: 0;
    margin-top: 2px;
}

.premium-feature-item strong {
    font-size: 0.92rem;
    color: var(--text-main);
    display: block;
    margin-bottom: 1px;
}

.premium-feature-item p {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.premium-price-box {
    background: #f8fafc;
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
}

.premium-price {
    font-size: 2.25rem;
    font-weight: 900;
    color: var(--text-main);
    font-family: 'JetBrains Mono', monospace;
}

.price-period {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
}

.price-sub {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.premium-unlock-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary), #ec4899);
    color: white;
    border: none;
    border-radius: 16px;
    font-weight: 700;
    font-size: 1.05rem;
    cursor: pointer;
    box-shadow: 0 10px 25px -5px rgba(99, 102, 241, 0.4);
    transition: var(--transition-normal);
    outline: none;
}

.premium-unlock-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(99, 102, 241, 0.5);
    background: linear-gradient(135deg, var(--primary-hover), #db2777);
}

/* Background animated glow blur blobs specifically for Practice */
.bg-blobs {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: #fafbff;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.35;
    animation: floatBlobs 20s infinite alternate ease-in-out;
}

.blob-1 {
    top: -10%; left: -5%; width: 45vw; height: 45vw;
    background: #e0e7ff;
}

.blob-2 {
    bottom: -10%; right: -5%; width: 40vw; height: 40vw;
    background: #fae8ff;
    animation-delay: -5s;
}

.blob-3 {
    top: 40%; left: 45%; width: 30vw; height: 30vw;
    background: #e0f2fe;
    animation-delay: -10s;
}

@keyframes floatBlobs {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(6%, 10%) scale(1.08); }
}

/* Responsive Overrides */
@media (max-width: 1024px) {
    .stats-grid-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .stats-grid-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .controls-panel {
        padding: 1.25rem;
    }
    
    .controls-main-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .controls-actions {
        justify-content: space-between;
    }
    
    .sort-select-dropdown, .controls-btn-action {
        flex-grow: 1;
        text-align: center;
        justify-content: center;
    }
    
    .bottom-filters-row {
        flex-direction: column;
        gap: 1.25rem;
    }
    
    .filter-item-wrap {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .toggle-buttons {
        width: 100%;
    }
    
    .toggle-btn {
        flex-grow: 1;
        text-align: center;
    }
    
    .pagination-container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}