/* ========== CSS Variables & Reset ========== */
:root {
    --bg-primary: #f0f2f7;
    --bg-secondary: #ffffff;
    --bg-sidebar: #0f172a;
    --bg-sidebar-hover: #1e293b;
    --bg-sidebar-active: #1e3a5f;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-sidebar: #94a3b8;
    --text-sidebar-active: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --sidebar-width: 280px;
    --topbar-height: 68px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Brand gradient */
    --gradient-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --gradient-brand-hover: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #9333ea 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Level Colors - Modern */
    --a1: #10b981;
    --a2: #34d399;
    --b1: #f59e0b;
    --b2: #f97316;
    --c1: #ef4444;
    --c2: #a855f7;
    --phrasal: #3b82f6;
    --verbs: #06b6d4;
    --essential: #14b8a6;
}

/* Dark theme */
[data-theme="dark"] {
    --bg-primary: #0b0f1a;
    --bg-secondary: #111827;
    --bg-sidebar: #070a12;
    --bg-sidebar-hover: #111827;
    --bg-sidebar-active: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #1e293b;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: #334155; }

/* ========== Sidebar ========== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition);
    overflow: hidden;
    border-right: 1px solid rgba(255,255,255,0.05);
}

.sidebar-header {
    padding: 24px 20px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-brand);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 17px;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
    transition: transform var(--transition-bounce);
}

.logo-icon:hover {
    transform: scale(1.08) rotate(-5deg);
}

.logo-text-wrap {
    display: flex;
    flex-direction: column;
}

.logo-text {
    color: #fff;
    font-size: 19px;
    font-weight: 800;
    letter-spacing: 0.5px;
    line-height: 1.1;
}

.logo-sub {
    color: #6366f1;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--text-sidebar);
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
    transition: color var(--transition);
}

.sidebar-close:hover { color: #fff; }

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.nav-section {
    margin-bottom: 4px;
}

.nav-section-title {
    color: #475569;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 14px 24px 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 24px;
    color: var(--text-sidebar);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition);
    position: relative;
    cursor: pointer;
    border-radius: 0;
    margin: 1px 0;
}

.nav-item:hover {
    background: var(--bg-sidebar-hover);
    color: #e2e8f0;
}

.nav-item.active {
    background: var(--bg-sidebar-active);
    color: var(--text-sidebar-active);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: var(--gradient-brand);
    border-radius: 0 3px 3px 0;
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 13px;
    opacity: 0.6;
}

.nav-item.active i { opacity: 1; color: #818cf8; }

.level-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 6px currentColor;
}

.nav-badge {
    margin-left: auto;
    background: rgba(255,255,255,0.06);
    color: #64748b;
    font-size: 10.5px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 10px;
    min-width: 28px;
    text-align: center;
    letter-spacing: 0.3px;
}

.nav-item.active .nav-badge {
    background: rgba(99, 102, 241, 0.25);
    color: #a5b4fc;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.footer-creators {
    margin-bottom: 12px;
}

.footer-label {
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: #475569;
    margin-bottom: 6px;
}

.footer-name {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #94a3b8;
    font-size: 12px;
    font-weight: 500;
    padding: 3px 0;
}

.footer-name i {
    font-size: 10px;
    color: #6366f1;
}

.footer-text {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #334155;
    font-size: 11px;
}

.footer-text i { color: #ef4444; font-size: 10px; }

/* ========== Main Content ========== */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

/* ========== Top Bar ========== */
.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 32px;
    background: rgba(255,255,255,0.85);
    border-bottom: 1px solid var(--border-color);
    min-height: var(--topbar-height);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
}

[data-theme="dark"] .topbar {
    background: rgba(17, 24, 39, 0.85);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 6px;
}

.search-container {
    flex: 1;
    max-width: 560px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 14px;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 11px 100px 11px 44px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all var(--transition);
    outline: none;
}

.search-input:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    background: var(--bg-secondary);
}

.search-input::placeholder {
    color: #94a3b8;
    font-weight: 400;
}

.search-shortcut {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 3px 8px;
    font-size: 11px;
    color: var(--text-secondary);
    font-family: inherit;
    pointer-events: none;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-left: auto;
}

.current-filter {
    font-size: 13px;
    font-weight: 600;
    color: #6366f1;
    white-space: nowrap;
    background: rgba(99, 102, 241, 0.08);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-secondary);
    font-size: 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
}

.theme-toggle:hover {
    background: #6366f1;
    color: #fff;
    border-color: #6366f1;
    transform: rotate(20deg);
}

/* ========== Hero Section ========== */
.hero-section {
    background: var(--gradient-hero);
    padding: 48px 32px 40px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-section::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 18px;
    letter-spacing: 0.3px;
    border: 1px solid rgba(255,255,255,0.2);
}

.hero-badge i { font-size: 11px; }

.hero-title {
    color: #fff;
    font-size: 36px;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
}

.gradient-text {
    background: linear-gradient(135deg, #fde68a 0%, #fbbf24 50%, #f59e0b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    color: rgba(255,255,255,0.8);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 28px;
    max-width: 560px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 0;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: 20px 28px;
    border: 1px solid rgba(255,255,255,0.15);
    width: fit-content;
}

.hero-stat {
    text-align: center;
    padding: 0 24px;
}

.hero-stat-value {
    font-size: 28px;
    font-weight: 900;
    color: #fff;
    line-height: 1;
    margin-bottom: 4px;
}

.hero-stat-label {
    font-size: 11px;
    font-weight: 600;
    color: rgba(255,255,255,0.65);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.2);
}

/* ========== Stats Container ========== */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(155px, 1fr));
    gap: 12px;
    padding: 24px 32px 8px;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 18px 16px;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 14px;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md), 0 0 0 1px var(--accent);
    border-color: var(--accent);
}

.stat-card .stat-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent);
    opacity: 0.8;
    transition: opacity var(--transition);
}

.stat-card:hover .stat-bar { opacity: 1; }

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    flex-shrink: 0;
}

.stat-info { flex: 1; min-width: 0; }

.stat-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.stat-value {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

/* ========== Table Section ========== */
.table-section {
    padding: 20px 32px 32px;
    flex: 1;
}

.table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 12px;
}

.table-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-icon {
    color: #6366f1;
    font-size: 14px;
}

.table-info span:first-of-type + span {
    font-weight: 700;
    color: var(--text-primary);
}

#resultCount {
    font-weight: 800;
    color: #6366f1;
    font-size: 15px;
}

.table-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Sort Dropdown */
.sort-dropdown {
    position: relative;
}

.sort-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
}

.sort-btn:hover { border-color: #6366f1; color: #6366f1; }

.sort-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: none;
    min-width: 180px;
    z-index: 20;
    overflow: hidden;
    padding: 4px;
}

.sort-menu.open { display: block; }

.sort-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    transition: all var(--transition);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.sort-menu a i { color: var(--text-secondary); font-size: 12px; width: 16px; }

.sort-menu a:hover { background: var(--bg-primary); color: #6366f1; }
.sort-menu a:hover i { color: #6366f1; }

/* View Toggle */
.view-toggle {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.view-btn {
    padding: 8px 14px;
    background: var(--bg-secondary);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    font-size: 13px;
}

.view-btn.active {
    background: var(--gradient-brand);
    color: #fff;
}

.view-btn:not(.active):hover {
    background: var(--bg-primary);
    color: #6366f1;
}

/* ========== Table ========== */
.table-wrapper {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.vocab-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.vocab-table thead {
    position: sticky;
    top: 0;
    z-index: 5;
}

.vocab-table th {
    background: var(--bg-primary);
    padding: 14px 18px;
    text-align: left;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
    user-select: none;
}

.vocab-table td {
    padding: 13px 18px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
    color: var(--text-primary);
}

.vocab-table tbody tr {
    transition: all var(--transition);
    cursor: pointer;
}

.vocab-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.04);
}

[data-theme="dark"] .vocab-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.08);
}

.vocab-table tbody tr:last-child td {
    border-bottom: none;
}

.th-num { width: 55px; }
.th-word { min-width: 200px; width: 35%; }
.th-uzbek { min-width: 200px; width: 43%; }
.th-level { width: 110px; }

.word-cell {
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}

.uzbek-cell {
    color: var(--text-secondary);
    font-size: 13px;
}

.topic-tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 500;
    background: rgba(107, 114, 128, 0.08);
    color: var(--text-secondary);
}

.level-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3px;
    min-width: 42px;
}

/* Level badge colors */
.level-A1 { background: rgba(16, 185, 129, 0.12); color: #059669; }
.level-A2 { background: rgba(52, 211, 153, 0.15); color: #047857; }
.level-B1 { background: rgba(245, 158, 11, 0.15); color: #d97706; }
.level-B2 { background: rgba(249, 115, 22, 0.15); color: #ea580c; }
.level-C1 { background: rgba(239, 68, 68, 0.12); color: #dc2626; }
.level-C2 { background: rgba(168, 85, 247, 0.12); color: #9333ea; }
.level-phrasal { background: rgba(59, 130, 246, 0.12); color: #2563eb; }
.level-Verbs { background: rgba(6, 182, 212, 0.12); color: #0891b2; }
.level-DestB1 { background: rgba(236, 72, 153, 0.12); color: #db2777; }
.level-DestB2 { background: rgba(244, 63, 94, 0.12); color: #e11d48; }
.level-DestC { background: rgba(139, 92, 246, 0.12); color: #7c3aed; }
.level-Essential1, .level-Essential2, .level-Essential3, .level-Essential4, .level-Essential5 {
    background: rgba(20, 184, 166, 0.12); color: #0d9488;
}

/* Dark mode level badges */
[data-theme="dark"] .level-A1 { background: rgba(16, 185, 129, 0.2); color: #34d399; }
[data-theme="dark"] .level-A2 { background: rgba(52, 211, 153, 0.2); color: #6ee7b7; }
[data-theme="dark"] .level-B1 { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
[data-theme="dark"] .level-B2 { background: rgba(249, 115, 22, 0.2); color: #fb923c; }
[data-theme="dark"] .level-C1 { background: rgba(239, 68, 68, 0.2); color: #f87171; }
[data-theme="dark"] .level-C2 { background: rgba(168, 85, 247, 0.2); color: #c084fc; }
[data-theme="dark"] .level-phrasal { background: rgba(59, 130, 246, 0.2); color: #93c5fd; }
[data-theme="dark"] .level-Verbs { background: rgba(6, 182, 212, 0.2); color: #67e8f9; }
[data-theme="dark"] .level-DestB1 { background: rgba(236, 72, 153, 0.2); color: #f9a8d4; }
[data-theme="dark"] .level-DestB2 { background: rgba(244, 63, 94, 0.2); color: #fda4af; }
[data-theme="dark"] .level-DestC { background: rgba(139, 92, 246, 0.2); color: #c4b5fd; }
[data-theme="dark"] .level-Essential1, [data-theme="dark"] .level-Essential2,
[data-theme="dark"] .level-Essential3, [data-theme="dark"] .level-Essential4,
[data-theme="dark"] .level-Essential5 {
    background: rgba(20, 184, 166, 0.2); color: #5eead4;
}

/* ========== Grid View ========== */
.grid-wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.grid-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.grid-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: #6366f1;
}

.grid-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    transition: height var(--transition);
}

.grid-card:hover::before { height: 4px; }

.grid-card[data-level="A1"]::before { background: var(--a1); }
.grid-card[data-level="A2"]::before { background: var(--a2); }
.grid-card[data-level="B1"]::before { background: var(--b1); }
.grid-card[data-level="B2"]::before { background: var(--b2); }
.grid-card[data-level="C1"]::before { background: var(--c1); }
.grid-card[data-level="C2"]::before { background: var(--c2); }
.grid-card[data-level="phrasal"]::before { background: var(--phrasal); }
.grid-card[data-level="Verbs"]::before { background: var(--verbs); }
.grid-card[data-level="DestB1"]::before { background: #ec4899; }
.grid-card[data-level="DestB2"]::before { background: #f43f5e; }
.grid-card[data-level="DestC"]::before { background: #8b5cf6; }
.grid-card[data-level="Essential1"]::before,
.grid-card[data-level="Essential2"]::before,
.grid-card[data-level="Essential3"]::before,
.grid-card[data-level="Essential4"]::before,
.grid-card[data-level="Essential5"]::before { background: var(--essential); }

.grid-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 10px;
}

.grid-card-word {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.grid-card-guide {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    line-height: 1.5;
}

.grid-card-def {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-style: italic;
}

.grid-card-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ========== Pagination ========== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 24px 0 8px;
    flex-wrap: wrap;
}

.page-btn {
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    padding: 0 6px;
}

.page-btn:hover:not(.disabled):not(.active) {
    border-color: #6366f1;
    color: #6366f1;
    background: rgba(99, 102, 241, 0.04);
}

.page-btn.active {
    background: var(--gradient-brand);
    border-color: #6366f1;
    color: #fff;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.page-btn.disabled {
    opacity: 0.35;
    cursor: default;
}

.page-dots {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* ========== Loading ========== */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    gap: 20px;
}

.loading.hidden { display: none; }

.spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border-color);
    border-top-color: #6366f1;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading p {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

/* ========== Modal ========== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.open {
    display: flex;
    animation: fadeIn 0.2s ease;
}

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

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-2xl);
    max-width: 520px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 25px 60px rgba(0,0,0,0.25);
    animation: modalSlide 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalSlide {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: none;
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    z-index: 5;
    transition: all var(--transition);
}

.modal-close:hover {
    background: #ef4444;
    color: #fff;
    transform: rotate(90deg);
}

.modal-content {
    padding: 36px;
}

.modal-word {
    font-size: 32px;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.modal-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.modal-divider {
    height: 1px;
    background: var(--border-color);
    margin: 18px 0;
}

.modal-section-title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.modal-definition {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
}

.modal-no-def {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 14px;
}

/* ========== Back to Top ========== */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: none;
    background: var(--gradient-brand);
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
    transition: all var(--transition-bounce);
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.5);
}

/* ========== Empty State ========== */
.empty-state {
    text-align: center;
    padding: 80px 20px;
}

.empty-state i {
    font-size: 56px;
    color: var(--border-color);
    margin-bottom: 20px;
}

.empty-state h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ========== Hidden Utility ========== */
.hidden { display: none !important; }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 40px rgba(0,0,0,0.35);
    }

    .sidebar-close { display: block; }

    .main-content {
        margin-left: 0;
    }

    .hamburger { display: flex; }

    .hero-title { font-size: 28px; }
    .hero-stats { flex-wrap: wrap; gap: 12px; }
    .hero-stat-divider { display: none; }
}

@media (max-width: 768px) {
    .topbar {
        padding: 10px 16px;
    }

    .search-shortcut { display: none; }

    .search-input { padding-right: 14px; }

    .hero-section { padding: 32px 16px; }
    .hero-title { font-size: 24px; }
    .hero-desc { font-size: 13px; }
    .hero-stat-value { font-size: 22px; }

    .stats-container {
        padding: 16px 16px 4px;
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 8px;
    }

    .stat-card { padding: 14px 12px; }
    .stat-value { font-size: 20px; }
    .stat-icon { width: 34px; height: 34px; font-size: 13px; }

    .table-section { padding: 12px 16px 20px; }

    .vocab-table { font-size: 13px; }

    .vocab-table th,
    .vocab-table td { padding: 11px 12px; }

    .grid-wrapper {
        grid-template-columns: 1fr;
    }

    .modal { margin: 12px; border-radius: var(--radius-lg); }
    .modal-content { padding: 28px; }
    .modal-word { font-size: 26px; }

    .current-filter { display: none; }
}

@media (max-width: 480px) {
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-label { font-size: 9px; }
    .stat-value { font-size: 18px; }

    .hero-stats { padding: 14px 18px; }
    .hero-stat { padding: 0 14px; }

    .table-actions { display: none; }
}

/* ========== Print ========== */
@media print {
    .sidebar, .topbar, .stats-container, .pagination,
    .back-to-top, .table-actions, .table-info, .hero-section { display: none !important; }
    .main-content { margin-left: 0; }
    .table-section { padding: 0; }
    .table-wrapper { border: 1px solid #ccc; }
}

/* ========== Animations ========== */
@keyframes slideInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.stat-card { animation: slideInUp 0.4s ease both; }
.stat-card:nth-child(1) { animation-delay: 0.05s; }
.stat-card:nth-child(2) { animation-delay: 0.1s; }
.stat-card:nth-child(3) { animation-delay: 0.15s; }
.stat-card:nth-child(4) { animation-delay: 0.2s; }
.stat-card:nth-child(5) { animation-delay: 0.25s; }
.stat-card:nth-child(6) { animation-delay: 0.3s; }
.stat-card:nth-child(7) { animation-delay: 0.35s; }
.stat-card:nth-child(8) { animation-delay: 0.4s; }
.stat-card:nth-child(9) { animation-delay: 0.45s; }
.stat-card:nth-child(10) { animation-delay: 0.5s; }
.stat-card:nth-child(11) { animation-delay: 0.55s; }
.stat-card:nth-child(12) { animation-delay: 0.6s; }