/* =========================================
   UNIFIED STYLES - Light/Dark Theme System
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* =========================================
   THEME VARIABLES
   ========================================= */

:root, [data-theme="light"] {
    /* Background */
    --bg-app: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-sidebar: #FFFFFF;
    --bg-header: rgba(255, 255, 255, 0.85);
    --bg-overlay: rgba(15, 23, 42, 0.4);
    
    /* Glass Effects */
    --glass-panel: #FFFFFF;
    --glass-border: rgba(226, 232, 240, 0.8);
    --glass-highlight: rgba(255, 255, 255, 0.6);
    
    /* Text */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    
    /* Accents */
    --accent-blue: #2563EB;
    --accent-purple: #7C3AED;
    --accent-cyan: #0891B2;
    --accent-green: #059669;
    --accent-red: #DC2626;
    
    /* Shadows */
    --shadow-sidebar: 4px 0 24px rgba(0, 0, 0, 0.03);
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.03), 0 20px 25px -5px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(226, 232, 240, 0.7);
    --shadow-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(37, 99, 235, 0.2);
    --shadow-header: 0 1px 3px rgba(0, 0, 0, 0.03);
    --shadow-btn: 0 2px 4px rgba(0, 0, 0, 0.05);
    
    /* Mesh Background (hidden in light) */
    --mesh-opacity: 0;
    --mesh-1: transparent;
    --mesh-2: transparent;
    
    /* Font */
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    
    /* Layout */
    --sidebar-width: 320px;
    --header-height: 70px;
}

[data-theme="dark"] {
    /* Background */
    --bg-app: #0B0F19;
    --bg-card: rgba(17, 24, 39, 0.85);
    --bg-sidebar: rgba(11, 15, 25, 0.9);
    --bg-header: rgba(11, 15, 25, 0.85);
    --bg-overlay: rgba(0, 0, 0, 0.6);
    
    /* Glass Effects */
    --glass-panel: rgba(17, 24, 39, 0.85);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.05);
    
    /* Text */
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-tertiary: #64748B;
    
    /* Accents */
    --accent-blue: #3B82F6;
    --accent-purple: #8B5CF6;
    --accent-cyan: #06B6D4;
    --accent-green: #10B981;
    --accent-red: #EF4444;
    
    /* Shadows */
    --shadow-sidebar: none;
    --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08);
    --shadow-hover: 0 25px 50px -12px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(59, 130, 246, 0.3);
    --shadow-header: none;
    --shadow-btn: 0 4px 15px rgba(0, 0, 0, 0.3);
    
    /* Mesh Background */
    --mesh-opacity: 1;
    --mesh-1: #1E1B4B;
    --mesh-2: #312E81;
    
    /* Font */
    --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Inter', sans-serif;
    
    /* Layout */
    --sidebar-width: 320px;
    --header-height: 70px;
}

/* =========================================
   BASE STYLES
   ========================================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Mesh Background (Dark theme only) */
.mesh-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 0% 0%, var(--mesh-1) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, var(--mesh-2) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 40%);
    filter: blur(60px);
    opacity: var(--mesh-opacity);
    transition: opacity 0.3s ease;
}

/* =========================================
   LAYOUT
   ========================================= */

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* =========================================
   TOP HEADER BAR
   ========================================= */

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 100;
    padding: 0 40px;
    background: var(--bg-header);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
}

[data-theme="dark"] .top-bar {
    border-radius: 0 0 24px 24px;
}

.brand-area {
    display: flex;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.brand-logo:hover {
    transform: scale(1.02);
}

.brand-icon {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
    overflow: hidden;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease;
    border: 1.5px solid rgba(0, 0, 0, 0.1);
}

.brand-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

[data-theme="dark"] .brand-icon {
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 0 18px rgba(255, 209, 0, 0.4), 0 4px 14px rgba(0, 0, 0, 0.7);
    background: rgba(255, 255, 255, 0.1);
}

.brand-info {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.brand-text {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    line-height: 1.2;
}

[data-theme="dark"] .brand-text {
    background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-badge {
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    line-height: 1;
}

.belgian-flag-mini {
    display: inline-flex;
    width: 14px;
    height: 10px;
    border-radius: 2px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.flag-stripe {
    flex: 1;
    height: 100%;
}

.stripe-black {
    background-color: #000000;
}

.stripe-yellow {
    background-color: #FFD100;
}

.stripe-red {
    background-color: #EF3340;
}

.badge-text {
    display: inline-flex;
    letter-spacing: 0.5px;
    font-weight: 800;
}

.t-black {
    color: #111827;
    transition: color 0.3s ease;
}

[data-theme="dark"] .t-black {
    color: #E2E8F0;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.2);
}

.t-yellow {
    color: #F59E0B;
    text-shadow: 0 0 6px rgba(245, 158, 11, 0.35);
}

[data-theme="dark"] .t-yellow {
    color: #FCD34D;
    text-shadow: 0 0 8px rgba(252, 211, 77, 0.4);
}

.t-red {
    color: #EF4444;
    text-shadow: 0 0 6px rgba(239, 68, 68, 0.35);
}

[data-theme="dark"] .t-red {
    color: #F87171;
    text-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
}

.badge-heart {
    font-size: 0.72rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    animation: heartBeat 2.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    transform-origin: center;
    filter: drop-shadow(0 0 4px rgba(239, 68, 68, 0.4));
}

@keyframes heartBeat {
    0%, 100% {
        transform: scale(1);
    }
    14% {
        transform: scale(1.22);
    }
    28% {
        transform: scale(1);
    }
    42% {
        transform: scale(1.15);
    }
    70% {
        transform: scale(1);
    }
}

.top-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Search Box */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 12px 20px 12px 40px;
    width: 280px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    font-family: var(--font-main);
    transition: all 0.2s;
    box-shadow: var(--shadow-btn);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
    pointer-events: none;
    display: block; /* Fix for cross-browser alignment */
}

/* User Profile */
.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    padding: 6px 8px 6px 16px;
    border-radius: 30px;
    box-shadow: var(--shadow-btn);
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--glass-border);
}

.user-profile:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.user-profile-wrapper {
    position: relative;
}

.user-profile-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: auto;
    min-width: 160px;
    background: #EAEAEC;
    border: 1px solid #D1D1D6;
    border-radius: 16px;
    padding: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: 200;
}

.user-profile-dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    right: 24px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #EAEAEC;
}

[data-theme="dark"] .user-profile-dropdown::before {
    border-bottom-color: #0f172a;
}

.user-profile-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-profile-wrapper .user-profile .dropdown-arrow {
    transition: transform 0.3s ease;
}

.user-profile-wrapper .user-profile-dropdown.open ~ .user-profile .dropdown-arrow {
    transform: rotate(180deg);
}

/* Fix for the sibling selector above: it doesn't work because dropdown is AFTER profile. 
   Let's use a class on the wrapper or just handle it in JS if needed, 
   but CSS is better if we change the order or use :has() if supported. 
   Actually, let's just add a class to the profile when open via JS. */
.user-profile.menu-open .dropdown-arrow {
    transform: rotate(180deg);
}

[data-theme="dark"] .user-profile-dropdown {
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.user-info {
    display: flex;
    flex-direction: column;
    text-align: right;
    line-height: 1.2;
}

.user-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.user-role {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.avatar {
    width: 38px;
    height: 38px;
    background: var(--text-primary);
    color: var(--bg-app);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    transition: all 0.3s ease;
}

[data-theme="dark"] .avatar {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: white;
}

/* =========================================
   SIDEBAR
   ========================================= */

.sidebar {
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    position: fixed;
    left: 0;
    top: var(--header-height);
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sidebar);
    display: flex;
    flex-direction: column;
    z-index: 50;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding-top: 24px;
}

[data-theme="dark"] .sidebar {
    height: calc(100vh - var(--header-height) - 48px);
    top: calc(var(--header-height) + 24px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 40;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* Mobile Search (in sidebar) */
.mobile-search-box {
    display: none;
    padding: 0 16px;
    margin-bottom: 16px;
    position: relative;
    align-items: center; /* Vertical centering for children */
}

.mobile-search-box .search-input {
    width: 100%;
    padding-left: 40px;
}

/* Nav Menu */
.nav-menu {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 0 16px;
}

.nav-menu::-webkit-scrollbar {
    width: 4px;
}

.nav-menu::-webkit-scrollbar-track {
    background: transparent;
}

.nav-menu::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}

[data-theme="dark"] .nav-menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
}

/* Topic Groups & Accordion */
.topic-group {
    margin-bottom: 8px;
    border-radius: 14px;
    transition: all 0.2s ease;
}

.topic-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.04);
    cursor: pointer;
    user-select: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.topic-header:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .topic-header {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .topic-header:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.1);
}

.topic-emoji {
    font-size: 1.1rem;
    line-height: 1;
    flex-shrink: 0;
}

.topic-title {
    flex: 1;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: 0.2px;
}

.topic-badge {
    padding: 2px 7px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(0, 122, 255, 0.1);
    color: var(--accent-blue);
    min-width: 20px;
    text-align: center;
}

[data-theme="dark"] .topic-badge {
    background: rgba(96, 165, 250, 0.15);
    color: #60A5FA;
}

.topic-chevron {
    color: var(--text-secondary);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.topic-group.collapsed .topic-chevron {
    transform: rotate(-90deg);
}

.topic-lessons {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 6px 0 2px 8px;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease, padding 0.25s ease;
    overflow: hidden;
}

.topic-group.collapsed .topic-lessons {
    max-height: 0 !important;
    opacity: 0;
    padding: 0;
    pointer-events: none;
}

.nav-item {
    padding: 10px 14px;
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid transparent;
    background: transparent;
    position: relative;
}

.nav-item:hover {
    background: rgba(37, 99, 235, 0.06);
    color: var(--accent-blue);
    transform: translateX(4px);
}

[data-theme="dark"] .nav-item:hover {
    background: rgba(59, 130, 246, 0.08);
    color: #93C5FD;
}

.nav-item.active {
    background: rgba(37, 99, 235, 0.08);
    color: var(--accent-blue);
    border-color: rgba(37, 99, 235, 0.25);
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.08);
}

[data-theme="dark"] .nav-item.active {
    background: rgba(59, 130, 246, 0.14);
    color: #60A5FA;
    border-color: rgba(59, 130, 246, 0.35);
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.15);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 18px;
    background: var(--accent-blue);
    border-radius: 4px;
}

/* Progress Indicator */
.progress-indicator {
    width: 22px;
    height: 22px;
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    background: var(--bg-card);
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    z-index: 10;
}

.progress-indicator:hover {
    border-color: var(--accent-blue);
    transform: scale(1.1);
}

.nav-item.completed .progress-indicator {
    background: var(--accent-green);
    border-color: var(--accent-green);
    box-shadow: 0 2px 6px rgba(52, 199, 89, 0.4);
}

.nav-item.completed .progress-indicator::after {
    content: '';
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 5px;
    height: 9px;
    border-bottom: 2.5px solid white;
    border-right: 2.5px solid white;
}

.nav-number {
    font-size: 0.9rem;
    font-weight: 800;
    opacity: 0.4;
    min-width: 24px;
    font-family: monospace;
}

.nav-emoji {
    flex-shrink: 0;
    font-size: 1em;
}

.nav-text {
    flex: 1;
    line-height: 1.3;
    word-break: break-word;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 24px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.social-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--bg-card);
    color: var(--text-secondary);
    transition: all 0.2s;
    box-shadow: var(--shadow-btn);
    border: 1px solid var(--glass-border);
    text-decoration: none;
}

.social-icon:hover {
    background: var(--text-primary);
    color: var(--bg-app);
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

/* Colored Social Icons (Dark theme) */
[data-theme="dark"] .social-icon[aria-label="Phone"] { background: #22C55E; color: white; border-color: transparent; }
[data-theme="dark"] .social-icon[aria-label="Google Maps"] { background: #EA4335; color: white; border-color: transparent; }
[data-theme="dark"] .social-icon[aria-label="WhatsApp"] { background: #25D366; color: white; border-color: transparent; }
[data-theme="dark"] .social-icon[aria-label="Telegram"] { background: #0088CC; color: white; border-color: transparent; }
[data-theme="dark"] .social-icon[aria-label="Facebook"] { background: #1877F2; color: white; border-color: transparent; }

.social-icon svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* =========================================
   MAIN CONTENT
   ========================================= */

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: 0 40px;
    transition: all 0.3s ease;
}

.lesson-scroll-area {
    padding: 0 0 100px 0;
}

/* Lesson View */
.lesson-view {
    display: none;
    max-width: 900px;
    margin: 0 auto;
    padding-top: 40px;
    opacity: 0;
    transform: scale(0.98) translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.lesson-view.active {
    display: block;
    opacity: 1;
    transform: scale(1) translateY(0);
}

/* Content Card */
.content-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 56px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
}

/* Top gradient line */
.content-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
}

[data-theme="dark"] .content-card::before {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
}

.lesson-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 40px;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 32px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--shadow-btn);
}

[data-theme="dark"] .lesson-title {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(59, 130, 246, 0.3);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 15px rgba(59, 130, 246, 0.1);
}

[data-theme="dark"] .lesson-title::before {
    content: '';
    width: 4px;
    height: 32px;
    background: var(--accent-blue);
    border-radius: 2px;
    box-shadow: 0 0 15px var(--accent-blue);
}

.lesson-title-emoji {
    font-size: 2rem;
}

.lesson-title-text {
    flex: 1;
}

/* Lesson Body */
.lesson-body {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.lesson-body h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin: 40px 0 20px;
    font-weight: 600;
}

.lesson-body p {
    margin-bottom: 24px;
}

.lesson-body strong {
    font-weight: 700;
    color: var(--text-primary);
}

.lesson-body ul {
    list-style: none;
    margin: 24px 0;
    display: grid;
    gap: 12px;
}

.lesson-body li {
    padding: 14px 18px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--glass-border);
    transition: all 0.2s;
    position: relative;
    padding-left: 28px;
}

[data-theme="dark"] .lesson-body li {
    background: rgba(255, 255, 255, 0.02);
}

.lesson-body li::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-blue);
}

.lesson-body li:hover {
    background: rgba(0, 0, 0, 0.04);
    transform: translateX(4px);
}

[data-theme="dark"] .lesson-body li:hover {
    background: rgba(255, 255, 255, 0.04);
}

/* Example Box & Callout Styles */
.example-box {
    margin: 24px 0;
    padding: 20px 24px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.06) 0%, rgba(139, 92, 246, 0.03) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-left: 4px solid var(--accent-blue);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

[data-theme="dark"] .example-box {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(59, 130, 246, 0.3);
    border-left: 4px solid #60A5FA;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.example-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.example-box p {
    margin-bottom: 8px;
    line-height: 1.6;
}

.example-box p:last-child {
    margin-bottom: 0;
}

.example-box.warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(239, 68, 68, 0.04) 100%);
    border-color: rgba(245, 158, 11, 0.3);
    border-left: 4px solid #F59E0B;
}

[data-theme="dark"] .example-box.warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(239, 68, 68, 0.06) 100%);
    border-color: rgba(245, 158, 11, 0.4);
    border-left: 4px solid #FBBF24;
}

/* Conjugation Grid */
.conjugation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
    margin: 32px 0;
}

.conjugation-grid > div,
.conjugation-item {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--glass-border);
    padding: 18px 14px;
    border-radius: 14px;
    text-align: center;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .conjugation-grid > div,
[data-theme="dark"] .conjugation-item {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.08);
}

.conjugation-grid > div:hover,
.conjugation-item:hover {
    border-color: var(--accent-blue);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.15);
}

/* Video */
.video-wrapper {
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    margin: 32px 0;
    box-shadow: var(--shadow-card);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    background: #000;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Language Content Toggling */
.lang-content {
    display: none;
}

[data-lang="ru"] .lang-ru,
[data-lang="uk"] .lang-uk,
[data-lang="en"] .lang-en,
[data-lang="fr"] .lang-fr {
    display: inline-block;
}

/* For block elements like h2 or div */
h2.lang-content[style*="display: inline-block"],
div.lang-content[style*="display: inline-block"] {
    display: block !important;
}

/* Better way for block elements */
[data-lang="ru"] h2.lang-ru, [data-lang="ru"] div.lang-ru,
[data-lang="uk"] h2.lang-uk, [data-lang="uk"] div.lang-uk,
[data-lang="en"] h2.lang-en, [data-lang="en"] div.lang-en,
[data-lang="fr"] h2.lang-fr, [data-lang="fr"] div.lang-fr {
    display: block;
}

/* Search Highlight */
mark {
    background-color: rgba(255, 230, 0, 0.4);
    color: inherit;
    padding: 2px 4px;
    border-radius: 4px;
    font-weight: 600;
}

[data-theme="dark"] mark {
    background-color: rgba(255, 215, 0, 0.3);
    box-shadow: 0 0 0 1px rgba(255, 215, 0, 0.5);
}

/* =========================================
   NAVIGATION BUTTONS
   ========================================= */

.lesson-footer-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--glass-border);
}

.nav-btn {
    padding: 14px 32px;
    border-radius: 16px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-main);
}

.nav-btn.prev {
    background: var(--bg-card);
    color: var(--text-secondary);
}

.nav-btn.prev:hover {
    background: var(--bg-app);
    color: var(--text-primary);
    transform: translateX(-4px);
}

.option-btn:hover {
    background: var(--bg-app);
    transform: translateY(-1px);
}

/* Removed redundant .option-btn.active styles */

.nav-btn.next {
    background: var(--text-primary);
    color: var(--bg-app);
    border-color: transparent;
    box-shadow: var(--shadow-btn);
}

[data-theme="dark"] .nav-btn.next {
    background: rgba(59, 130, 246, 0.15);
    color: #60A5FA;
    border: 1px solid rgba(59, 130, 246, 0.3);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
}

.nav-btn.next:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-hover);
}

[data-theme="dark"] .nav-btn.next:hover {
    background: rgba(59, 130, 246, 0.25);
    border-color: rgba(59, 130, 246, 0.5);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* =========================================
   QUIZ STYLES
   ========================================= */

.quiz-container {
    margin-top: 40px;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    animation: slideUpFade 0.5s ease forwards;
}

[data-theme="dark"] .quiz-container {
    background: rgba(30, 41, 59, 0.5);
    border-color: rgba(59, 130, 246, 0.2);
}

.quiz-header {
    margin-bottom: 32px;
}

.quiz-meta {
    display: flex;
    justify-content: center;
    margin-bottom: 12px;
}

.quiz-counter {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.1);
    padding: 4px 16px;
    border-radius: 20px;
    border: 1px solid rgba(59, 130, 246, 0.2);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.1);
}

.quiz-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.quiz-progress {
    height: 12px;
    background: transparent;
    border-radius: 6px;
    overflow: visible;
}

.quiz-progress-segments {
    display: flex;
    gap: 6px;
    height: 100%;
    width: 100%;
}

.quiz-segment {
    flex: 1;
    background: var(--bg-app);
    border-radius: 4px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
    border: 1px solid rgba(255,255,255,0.05);
}

.quiz-segment.active {
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
    border-color: rgba(59, 130, 246, 0.5);
}

.quiz-segment.correct {
    background: #10b981 !important;
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
    border-color: #059669;
}

.quiz-segment.incorrect {
    background: #ef4444 !important;
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.4);
    border-color: #dc2626;
}

.quiz-question-card {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.quiz-question-card.active {
    display: block;
}

.quiz-question-text {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 28px;
    margin-top: 8px;
    color: var(--text-primary);
    line-height: 1.4;
    text-align: center;
}

.quiz-choices {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.quiz-choice-btn {
    padding: 16px 24px;
    background: var(--bg-app);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-main);
}

.quiz-choice-btn:hover:not(:disabled) {
    background: var(--bg-card);
    border-color: var(--accent-blue);
    transform: translateX(4px);
}

.quiz-choice-btn.correct {
    background: rgba(34, 197, 94, 0.15) !important;
    border-color: #22c55e !important;
    color: #22c55e !important;
}

.quiz-choice-btn.incorrect {
    background: rgba(239, 68, 68, 0.15) !important;
    border-color: #ef4444 !important;
    color: #ef4444 !important;
}

.quiz-results {
    text-align: center;
    padding: 20px 0;
    animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.results-icon {
    font-size: 4rem;
    margin-bottom: 16px;
}

.results-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.results-score {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.btn-next-lesson {
    padding: 16px 40px;
    background: var(--accent-blue);
    color: white;
    border: none;
    border-radius: 16px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.btn-next-lesson:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px rgba(59, 130, 246, 0.4);
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

.nav-btn.hidden {
    visibility: hidden;
    pointer-events: none;
}

/* =========================================
   SETTINGS DROPDOWN
   ========================================= */

.settings-wrapper {
    position: relative;
}

.settings-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
    box-shadow: var(--shadow-btn);
}

.settings-btn:hover {
    color: var(--text-primary);
    transform: translateY(-1px);
}

.settings-btn svg {
    width: 20px;
    height: 20px;
}

.settings-dropdown {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: auto;
    min-width: 200px;
    background: #EAEAEC;
    border: 1px solid #D1D1D6;
    border-radius: 16px;
    padding: 16px 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: 200;
}

.settings-dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    right: 12px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid #EAEAEC;
}

[data-theme="dark"] .settings-dropdown::before {
    border-bottom-color: #0f172a;
}

.settings-dropdown.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Dark theme: solid background to match header style but without transparency issues */
[data-theme="dark"] .settings-dropdown {
    background: #0f172a;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

/* Mobile: dropdown below header */
@media (max-width: 900px) {
    .settings-dropdown {
        position: fixed;
        top: calc(var(--header-height) + 10px);
        left: 50%;
        right: auto;
        transform: translateX(-50%) scale(0.9);
    }
    
    .settings-dropdown.open {
        transform: translateX(-50%) scale(1);
    }
}

.settings-section {
    margin-bottom: 20px;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.settings-options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.option-btn {
    padding: 8px 14px;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-main);
}

[data-theme="dark"] .option-btn {
    background: rgba(255, 255, 255, 0.03);
}

.option-btn:hover {
    color: var(--text-primary);
}

.option-btn.active {
    background: rgba(0, 122, 255, 0.1);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

[data-theme="dark"] .option-btn.active {
    background: rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.4);
    color: #60A5FA;
}

/* Theme Switcher */
.theme-switcher {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: center;
    padding: 8px 0;
}

.theme-switcher.left-aligned {
    justify-content: flex-start;
}

/* Settings Divider */
.settings-divider {
    height: 1px;
    background: #C7C7CC;
    margin: 12px 0;
}

[data-theme="dark"] .settings-divider {
    background: rgba(255, 255, 255, 0.3);
}

/* Language Options */
.lang-options {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    flex-wrap: nowrap;
}

.lang-options .option-btn {
    background: transparent;
    border: none;
    padding: 8px 12px;
    font-size: 1.4rem;
    border-radius: 8px;
    transition: all 0.2s;
    flex-shrink: 0;
}

.lang-options .option-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: scale(1.1);
}

.lang-options .option-btn.active {
    background: rgba(0, 122, 255, 0.08);
    border: 1px solid rgba(0, 122, 255, 0.2) !important;
    box-shadow: none;
    transform: scale(1.05);
    opacity: 1;
}

[data-theme="dark"] .lang-options .option-btn.active {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3) !important;
}

.lang-options .option-btn[data-lang="ru"] {
    opacity: 0.85;
}

.lang-options .option-btn[data-lang="ru"]:hover,
.lang-options .option-btn[data-lang="ru"].active {
    opacity: 1;
}

.option-divider {
    width: 1px;
    height: 24px;
    background: var(--glass-border);
}

.theme-icon {
    font-size: 1.2rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #D1D1D6;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: 0.3s;
    border-radius: 26px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .slider {
    background: rgba(255, 255, 255, 0.1);
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(251, 191, 36, 0.3);
}

input:checked + .slider {
    background: rgba(59, 130, 246, 0.2);
    border-color: rgba(59, 130, 246, 0.4);
}

input:checked + .slider:before {
    transform: translateX(24px);
    background: linear-gradient(135deg, #60A5FA, #3B82F6);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

/* =========================================
   MODAL
   ========================================= */

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.open {
    display: flex;
    opacity: 1;
}

.modal-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    width: 90%;
    max-width: 480px;
    padding: 40px;
    border-radius: 24px;
    text-align: center;
    box-shadow: var(--shadow-card);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.open .modal-card {
    transform: scale(1);
}

.modal-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.modal-text {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.5;
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-quiz {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    padding: 16px;
    border-radius: 16px;
    font-weight: 700;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: transform 0.2s;
    width: 100%;
    font-family: var(--font-main);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-quiz:hover {
    transform: scale(1.02);
}

.btn-skip {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 12px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-main);
}

.btn-skip:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

/* =========================================
   HAMBURGER BUTTON (Mobile)
   ========================================= */

.hamburglar {
    transform: scale(0.8);
    position: fixed;
    bottom: 48px;
    right: 24px;
    display: none;
    width: 68px;
    height: 68px;
    background: var(--bg-card);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    box-shadow: var(--shadow-card);
    cursor: pointer;
    z-index: 100;
    -webkit-touch-callout: none;
    user-select: none;
}

.hamburglar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.path-burger {
    position: absolute;
    top: 0;
    left: 0;
    height: 68px;
    width: 68px;
    mask: url(#mask);
    -webkit-mask-box-image: url(https://raygun.io/upload/mask.svg);
}

.animate-path {
    position: absolute;
    top: 0;
    left: 0;
    width: 68px;
    height: 68px;
}

.path-rotation {
    height: 34px;
    width: 34px;
    margin: 34px 34px 0 0;
    transform: rotate(0deg);
    transform-origin: 100% 0;
}

.path-rotation:before {
    content: '';
    display: block;
    width: 30px;
    height: 34px;
    margin: 0 4px 0 0;
    background: var(--text-primary);
}

@keyframes rotate-out {
    0% { transform: rotate(0deg); }
    40% { transform: rotate(180deg); }
    100% { transform: rotate(360deg); }
}

@keyframes rotate-in {
    0% { transform: rotate(360deg); }
    40% { transform: rotate(180deg); }
    100% { transform: rotate(0deg); }
}

.hamburglar.is-open .path {
    animation: dash-in 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-open .animate-path {
    animation: rotate-in 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-closed .path {
    animation: dash-out 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-closed .animate-path {
    animation: rotate-out 0.6s linear normal;
    animation-fill-mode: forwards;
}

.path {
    stroke-dasharray: 240;
    stroke-dashoffset: 240;
    stroke-linejoin: round;
}

@keyframes dash-in {
    0% { stroke-dashoffset: 240; }
    40% { stroke-dashoffset: 240; }
    100% { stroke-dashoffset: 0; }
}

@keyframes dash-out {
    0% { stroke-dashoffset: 0; }
    40% { stroke-dashoffset: 240; }
    100% { stroke-dashoffset: 240; }
}

.burger-icon {
    position: absolute;
    padding: 20px 16px;
    height: 68px;
    width: 68px;
}

.burger-container {
    position: relative;
    height: 28px;
    width: 36px;
}

.burger-bun-top,
.burger-bun-bot,
.burger-filling {
    position: absolute;
    display: block;
    height: 4px;
    width: 36px;
    border-radius: 2px;
    background: var(--text-primary);
}

.burger-bun-top {
    top: 0;
    transform-origin: 18px 2px;
}

.burger-bun-bot {
    bottom: 0;
    transform-origin: 18px 2px;
}

.burger-filling {
    top: 12px;
}

.hamburglar.is-open .burger-bun-top {
    animation: bun-top-out 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-open .burger-bun-bot {
    animation: bun-bot-out 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-closed .burger-bun-top {
    animation: bun-top-in 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-closed .burger-bun-bot {
    animation: bun-bot-in 0.6s linear normal;
    animation-fill-mode: forwards;
}

@keyframes bun-top-out {
    0% { transform: translateY(0) rotate(0deg); }
    20% { transform: translateY(0) rotate(15deg); }
    80% { transform: translateY(12px) rotate(-60deg); }
    100% { transform: translateY(12px) rotate(-45deg); width: 36px; }
}

@keyframes bun-bot-out {
    0% { transform: translateY(0) rotate(0deg); }
    20% { transform: translateY(0) rotate(-15deg); }
    80% { transform: translateY(-12px) rotate(60deg); }
    100% { transform: translateY(-12px) rotate(45deg); width: 36px; }
}

@keyframes bun-top-in {
    0% { transform: translateY(12px) rotate(-45deg); }
    20% { transform: translateY(12px) rotate(-60deg); }
    80% { transform: translateY(0) rotate(15deg); }
    100% { transform: translateY(0) rotate(0deg); width: 36px; }
}

@keyframes bun-bot-in {
    0% { transform: translateY(-12px) rotate(45deg); }
    20% { transform: translateY(-12px) rotate(60deg); }
    80% { transform: translateY(0) rotate(-15deg); }
    100% { transform: translateY(0) rotate(0deg); width: 36px; }
}

.hamburglar.is-open .burger-filling {
    animation: burger-fill-out 0.6s linear normal;
    animation-fill-mode: forwards;
}

.hamburglar.is-closed .burger-filling {
    animation: burger-fill-in 0.6s linear normal;
    animation-fill-mode: forwards;
}

@keyframes burger-fill-in {
    0% { width: 0; transform: rotate(40deg); }
    80% { width: 0; transform: rotate(-10deg); }
    100% { width: 36px; transform: rotate(0deg); }
}

@keyframes burger-fill-out {
    0% { width: 36px; }
    20% { width: 42px; transform: translate(-2px, -2px); }
    40% { width: 0; transform: translate(12px, -12px); }
    100% { width: 0; }
}

.burger-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 68px;
    height: 68px;
}

.svg-ring {
    width: 68px;
    height: 68px;
}

/* =========================================
   MOBILE RESPONSIVE
   ========================================= */

@media (max-width: 900px) {
    .top-bar {
        padding: 0 20px;
    }
    
    .search-box {
        display: none;
    }
    
    .mobile-search-box {
        display: flex; /* Changed from block to flex */
    }

    .mobile-search-box .search-icon {
        left: 30px; /* 16px padding + 14px offset */
    }

    .mobile-search-box .search-input {
        font-size: 16px; /* Prevent iOS zoom */
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        height: 100%;
        transform: translateX(-100%);
        width: 300px;
        border-radius: 0;
        padding-top: 80px;
    }
    
    [data-theme="dark"] .sidebar {
        height: 100%;
        top: 0;
        border-radius: 0;
        padding-top: 92px;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 0 20px;
    }
    
    /* Dark theme: show floating hamburger, hide header one */
    .hamburglar {
        display: block;
    }
    
    [data-theme="dark"] .header-hamburger {
        display: none;
    }
    
    /* Light theme: show header hamburger, hide floating one */
    [data-theme="light"] .hamburglar {
        display: none;
    }
    
    [data-theme="light"] .header-hamburger {
        display: flex;
    }
    
    /* Hide brand text on mobile */
    .brand-text {
        display: none;
    }
    
    .content-card {
        padding: 32px 24px;
        border-radius: 20px;
    }
    
    .lesson-title {
        font-size: 1.8rem;
        text-align: center;
        position: relative;
        padding: 20px;
        margin-bottom: 32px;
    }

    [data-theme="dark"] .lesson-title::before {
        display: none;
    }

    .lesson-title-emoji {
        font-size: 3.5rem;
        display: block;
        text-align: center;
        margin-bottom: 16px;
    }

    .lesson-title-text {
        display: block;
        line-height: 1.3;
    }
}

/* Header hamburger button (for light theme) */
.header-hamburger {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    box-shadow: var(--shadow-btn);
    margin-right: 12px;
}

.header-hamburger:hover {
    color: var(--text-primary);
    transform: translateY(-1px);
}

/* Dark theme: always hide header hamburger */
[data-theme="dark"] .header-hamburger {
    display: none !important;
}

/* =========================================
   READING PROGRESS BAR
   ========================================= */
.reading-progress-track {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(120, 120, 128, 0.12);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 24px;
    z-index: 10;
}

.reading-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan));
    border-radius: 2px;
    transition: width 0.12s ease-out;
}

/* =========================================
   FRENCH LINGUISTIC TYPOGRAPHY & HIGHLIGHTS
   ========================================= */

/* Gender styling */
.gender-m {
    color: #2563EB;
    background: rgba(37, 99, 235, 0.08);
    padding: 2px 6px;
    border-radius: 6px;
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

[data-theme="dark"] .gender-m {
    color: #60A5FA;
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
}

.gender-f {
    color: #E11D48;
    background: rgba(225, 29, 72, 0.08);
    padding: 2px 6px;
    border-radius: 6px;
    font-weight: 500;
    border: 1px solid rgba(225, 29, 72, 0.2);
}

[data-theme="dark"] .gender-f {
    color: #F472B6;
    background: rgba(236, 72, 153, 0.15);
    border-color: rgba(236, 72, 153, 0.3);
}

.gender-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 1px 6px;
    border-radius: 9999px;
    margin-left: 4px;
    vertical-align: middle;
    letter-spacing: 0.05em;
}

.gender-badge.m {
    background: #2563EB;
    color: #FFFFFF;
}

.gender-badge.f {
    background: #E11D48;
    color: #FFFFFF;
}

/* Silent letters (lettres muettes) */
.silent-letter {
    opacity: 0.38;
    text-decoration: underline dotted 1px rgba(120, 120, 128, 0.6);
    transition: opacity 0.2s ease;
}

.silent-letter:hover {
    opacity: 0.8;
}

/* French Liaison arc */
.liaison {
    position: relative;
    display: inline-block;
    padding-bottom: 2px;
}

.liaison::after {
    content: '‿';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.1em;
    color: var(--accent-purple);
    pointer-events: none;
}

/* Verb Stem vs Ending */
.verb-stem {
    font-weight: 600;
}

.verb-ending {
    font-weight: 700;
    color: var(--accent-purple);
    border-bottom: 2px solid var(--accent-purple);
}

/* =========================================
   MODERN CALLOUT CARDS & NOTICES
   ========================================= */
.callout-box {
    margin: 20px 0;
    padding: 16px 20px;
    border-radius: 14px;
    border-left: 4px solid;
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.callout-box:hover {
    transform: translateY(-2px);
}

.callout-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 6px;
}

.callout-content {
    font-size: 0.95rem;
    line-height: 1.55;
    color: var(--text-primary);
}

/* Tip / Astuce (Amber/Gold) */
.callout-tip {
    border-left-color: #F59E0B;
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-left-width: 4px;
}

.callout-tip .callout-title {
    color: #D97706;
}

[data-theme="dark"] .callout-tip .callout-title {
    color: #FBBF24;
}

/* Belgium / Regional differences (Belgian Red) */
.callout-belgium {
    border-left-color: #EF4444;
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-left-width: 4px;
}

.callout-belgium .callout-title {
    color: #DC2626;
}

[data-theme="dark"] .callout-belgium .callout-title {
    color: #F87171;
}

/* Warning / Faux amis (Pink/Rose) */
.callout-warning {
    border-left-color: #E11D48;
    background: rgba(225, 29, 72, 0.08);
    border: 1px solid rgba(225, 29, 72, 0.2);
    border-left-width: 4px;
}

.callout-warning .callout-title {
    color: #E11D48;
}

[data-theme="dark"] .callout-warning .callout-title {
    color: #FB7185;
}

/* Grammar Rule (Blue) */
.callout-rule {
    border-left-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.08);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-left-width: 4px;
}

.callout-rule .callout-title {
    color: var(--accent-blue);
}

/* =========================================
   INTERACTIVE FLASHCARDS / FLIP CARDS (DYNAMICS)
   ========================================= */
.flip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 16px;
    margin: 22px 0;
}

.flip-card {
    background-color: transparent;
    height: 125px;
    perspective: 1000px;
    cursor: pointer;
    user-select: none;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.flip-card:active {
    transform: scale(0.97);
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
    border-radius: 16px;
}

.flip-card.is-flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--glass-border);
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.flip-card:hover .flip-card-front {
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}

.flip-card-front {
    color: var(--text-primary);
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(248, 250, 252, 0.9) 100%);
}

[data-theme="dark"] .flip-card-front {
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.9) 0%, rgba(15, 23, 42, 0.95) 100%);
}

.flip-card-back {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
    color: var(--text-primary);
    border-color: var(--accent-purple);
    box-shadow: 0 8px 24px rgba(124, 58, 237, 0.15);
}

.flip-hint {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-top: 6px;
    padding: 3px 10px;
    background: rgba(120, 120, 128, 0.08);
    border-radius: 9999px;
}

.flip-hint::before {
    content: '🔄';
    font-size: 0.65rem;
    opacity: 0.7;
}

/* =========================================
   CONJUGATION CARDS & EXAMPLE BOX DYNAMICS
   ========================================= */
.conjugation-grid > div, .conjugation-item {
    transition: transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.22s ease, border-color 0.22s ease !important;
    border: 1px solid var(--glass-border) !important;
    border-radius: 14px !important;
}

.conjugation-grid > div:hover, .conjugation-item:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.08);
    border-color: rgba(59, 130, 246, 0.35) !important;
}

.example-box {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border-radius: 14px;
}

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

/* =========================================
   TACTILE 3D BUTTONS
   ========================================= */
.tactile-btn {
    position: relative;
    box-shadow: 0 4px 0 rgba(0, 0, 0, 0.15), 0 8px 16px rgba(0, 0, 0, 0.08);
    transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.2s;
    user-select: none;
}

.tactile-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 rgba(0, 0, 0, 0.15), 0 12px 20px rgba(0, 0, 0, 0.12);
}

.tactile-btn:active:not(:disabled) {
    transform: translateY(3px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.08);
}

/* =========================================
   VICTORY SCREEN & TROPHY AURA
   ========================================= */
.victory-card {
    text-align: center;
    padding: 38px 24px;
    background: radial-gradient(circle at 50% 30%, rgba(245, 158, 11, 0.15), transparent 70%), var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
    margin: 20px 0;
}

.victory-trophy-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.trophy-glow-rays {
    position: absolute;
    width: 140px;
    height: 140px;
    background: conic-gradient(from 0deg, rgba(245, 158, 11, 0.35), transparent 60deg, rgba(245, 158, 11, 0.35) 120deg, transparent 180deg, rgba(245, 158, 11, 0.35) 240deg, transparent 300deg, rgba(245, 158, 11, 0.35) 360deg);
    border-radius: 50%;
    animation: rayRotate 12s linear infinite;
    filter: blur(8px);
    z-index: 0;
}

@keyframes rayRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.victory-card .results-icon {
    font-size: 4.5rem;
    position: relative;
    z-index: 1;
    animation: trophyFloat 2.5s ease-in-out infinite alternate;
}

@keyframes trophyFloat {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(-8px) scale(1.06); }
}

.victory-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 9999px;
    background: linear-gradient(135deg, #F59E0B, #FBBF24);
    color: #1E1B4B;
    font-weight: 800;
    font-size: 0.95rem;
    letter-spacing: 0.04em;
    margin-bottom: 12px;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

.xp-reward-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border-radius: 12px;
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: #F59E0B;
    font-weight: 700;
    font-size: 1rem;
    margin: 16px 0 24px;
}

/* =========================================
   CUSTOM SLEEK SCROLLBAR
   ========================================= */
::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(120, 120, 128, 0.25);
    border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(120, 120, 128, 0.45);
}