/* ==================== CSS VARIABLES - THEMES ==================== */

/* Basic Style: White + Green */
:root,
[data-theme="basic"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-glass: rgba(255, 255, 255, 0.85);
    --bg-glass-dark: rgba(245, 245, 245, 0.95);
    
    --color-primary: #7ef29c;
    --color-primary-dark: #3ea66a;
    --color-primary-light: #b8f5c9;
    --color-accent: #2dd573;
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8a8a9a;
    --text-on-primary: #1a1a2e;
    
    --border-color: rgba(126, 242, 156, 0.5);
    --border-color-strong: rgba(126, 242, 156, 0.8);
    
    --shadow-sm: 0 2px 8px rgba(62, 166, 106, 0.15);
    --shadow-md: 0 4px 20px rgba(62, 166, 106, 0.2);
    --shadow-lg: 0 8px 40px rgba(62, 166, 106, 0.25);
    --shadow-glow: 0 0 30px rgba(126, 242, 156, 0.4);
    
    --font-title: 'FredokaOne', 'Segoe UI', sans-serif;
    --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    --btn-gradient: linear-gradient(135deg, #7ef29c 0%, #3ea66a 100%);
    --btn-hover-gradient: linear-gradient(135deg, #8ff5aa 0%, #4db878 100%);
    
    --grid-color: rgba(126, 242, 156, 0.15);
}

/* Dark Style: Black + White */
[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #121218;
    --bg-glass: rgba(18, 18, 24, 0.85);
    --bg-glass-dark: rgba(10, 10, 15, 0.95);
    
    --color-primary: #ffffff;
    --color-primary-dark: #e0e0e0;
    --color-primary-light: #f5f5f5;
    --color-accent: #ffffff;
    
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #707070;
    --text-on-primary: #0a0a0f;
    
    --border-color: rgba(255, 255, 255, 0.2);
    --border-color-strong: rgba(255, 255, 255, 0.4);
    
    --shadow-sm: 0 2px 8px rgba(255, 255, 255, 0.1);
    --shadow-md: 0 4px 20px rgba(255, 255, 255, 0.15);
    --shadow-lg: 0 8px 40px rgba(255, 255, 255, 0.2);
    --shadow-glow: 0 0 30px rgba(255, 255, 255, 0.3);
    
    --font-title: 'FredokaOne', 'Segoe UI', sans-serif;
    --font-body: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    
    --btn-gradient: linear-gradient(135deg, #ffffff 0%, #e0e0e0 100%);
    --btn-hover-gradient: linear-gradient(135deg, #f5f5f5 0%, #d0d0d0 100%);
    
    --grid-color: rgba(255, 255, 255, 0.08);
}

/* Pixel Style: Kazakh Landscape */
[data-theme="pixel"] {
    --bg-primary: #1a1c2c;
    --bg-secondary: #262b44;
    --bg-glass: rgba(26, 28, 44, 0.85);
    --bg-glass-dark: rgba(26, 28, 44, 0.95);
    
    --color-primary: #f4d35e;
    --color-primary-dark: #ee964b;
    --color-primary-light: #ffe66d;
    --color-accent: #e8a87c;
    
    --text-primary: #fffff0;
    --text-secondary: #c7cfcc;
    --text-muted: #8b9bb4;
    --text-on-primary: #1a1c2c;
    
    --border-color: rgba(244, 211, 94, 0.4);
    --border-color-strong: rgba(244, 211, 94, 0.6);
    
    --shadow-sm: 0 4px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 6px 0 rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 0 rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(244, 211, 94, 0.4);
    
    --font-title: 'ContraPhobotech', 'Monocraft', monospace;
    --font-body: 'Monocraft', 'Courier New', monospace;
    
    --btn-gradient: linear-gradient(180deg, #f4d35e 0%, #ee964b 100%);
    --btn-hover-gradient: linear-gradient(180deg, #ffe66d 0%, #f4a858 100%);
}

/* Flow Style: Matrix/Hacker */
[data-theme="flow"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-glass: rgba(22, 27, 34, 0.85);
    --bg-glass-dark: rgba(13, 17, 23, 0.95);
    
    --color-primary: #00ff41;
    --color-primary-dark: #00cc33;
    --color-primary-light: #33ff66;
    --color-accent: #39ff14;
    
    --text-primary: #00ff41;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --text-on-primary: #0d1117;
    
    --border-color: rgba(0, 255, 65, 0.3);
    --border-color-strong: rgba(0, 255, 65, 0.5);
    
    --shadow-sm: 0 0 10px rgba(0, 255, 65, 0.2);
    --shadow-md: 0 0 20px rgba(0, 255, 65, 0.3);
    --shadow-lg: 0 0 40px rgba(0, 255, 65, 0.4);
    --shadow-glow: 0 0 40px rgba(0, 255, 65, 0.5);
    
    --font-title: 'Monocraft', 'Courier New', monospace;
    --font-body: 'Monocraft', 'Consolas', monospace;
    
    --btn-gradient: linear-gradient(135deg, #00ff41 0%, #00cc33 100%);
    --btn-hover-gradient: linear-gradient(135deg, #33ff66 0%, #00ff41 100%);
}

/* ==================== BASE STYLES ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background 0.5s ease, color 0.5s ease;
}

.hidden {
    display: none !important;
}

/* ==================== BACKGROUND CONTAINER ==================== */
.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
}

.bg-basic,
.bg-dark,
.bg-pixel,
.bg-flow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

[data-theme="basic"] .bg-basic,
[data-theme="dark"] .bg-dark,
[data-theme="pixel"] .bg-pixel,
[data-theme="flow"] .bg-flow {
    opacity: 1;
    visibility: visible;
}

/* ==================== BASIC STYLE BACKGROUND ==================== */
.bg-basic {
    background: #ffffff;
}

.bg-basic .grid-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, rgba(126, 242, 156, 0.1) 1px, transparent 1px),
        linear-gradient(rgba(126, 242, 156, 0.1) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridPulse 4s ease-in-out infinite;
}

.shooting-stars-basic {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shooting-stars-basic .star {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 50%;
    opacity: 0;
    box-shadow: 0 0 10px 3px rgba(126, 242, 156, 0.8);
}

.shooting-stars-basic .star:nth-child(1) { top: 10%; left: -5%; animation: shootStar 7s linear infinite 0s; }
.shooting-stars-basic .star:nth-child(2) { top: 25%; left: -5%; animation: shootStar 9s linear infinite 1s; }
.shooting-stars-basic .star:nth-child(3) { top: 40%; left: -5%; animation: shootStar 8s linear infinite 2s; }
.shooting-stars-basic .star:nth-child(4) { top: 55%; left: -5%; animation: shootStar 10s linear infinite 3s; }
.shooting-stars-basic .star:nth-child(5) { top: 70%; left: -5%; animation: shootStar 7s linear infinite 4s; }
.shooting-stars-basic .star:nth-child(6) { top: 20%; left: -5%; animation: shootStar 9s linear infinite 5s; }
.shooting-stars-basic .star:nth-child(7) { top: 50%; left: -5%; animation: shootStar 8s linear infinite 6s; }
.shooting-stars-basic .star:nth-child(8) { top: 80%; left: -5%; animation: shootStar 10s linear infinite 2.5s; }
.shooting-stars-basic .star:nth-child(9) { top: 35%; left: -5%; animation: shootStar 7s linear infinite 4.5s; }

@keyframes shootStar {
    0% { transform: translateX(0) translateY(0); opacity: 0; }
    5% { opacity: 1; }
    80% { opacity: 0.8; }
    100% { transform: translateX(110vw) translateY(20vh); opacity: 0; }
}

@keyframes gridPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ==================== DARK STYLE BACKGROUND ==================== */
.bg-dark {
    background: #0a0a0f;
}

.bg-dark .grid-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridPulse 4s ease-in-out infinite;
}

.bg-dark .grid-lines {
    position: absolute;
    width: 100%;
    height: 100%;
}

.grid-line {
    position: absolute;
    background: rgba(255, 255, 255, 0.15);
}

.grid-line.horizontal {
    width: 200%;
    height: 1px;
    left: -50%;
    animation: moveHorizontal 20s linear infinite;
}

.grid-line.horizontal:nth-child(1) { top: 20%; animation-delay: 0s; }
.grid-line.horizontal:nth-child(2) { top: 50%; animation-delay: -7s; }
.grid-line.horizontal:nth-child(3) { top: 80%; animation-delay: -14s; }

.grid-line.vertical {
    width: 1px;
    height: 200%;
    top: -50%;
    animation: moveVertical 15s linear infinite;
}

.grid-line.vertical:nth-child(4) { left: 20%; animation-delay: 0s; }
.grid-line.vertical:nth-child(5) { left: 50%; animation-delay: -5s; }
.grid-line.vertical:nth-child(6) { left: 80%; animation-delay: -10s; }

@keyframes moveHorizontal {
    0% { transform: translateX(-25%); opacity: 0.3; }
    50% { opacity: 0.8; }
    100% { transform: translateX(25%); opacity: 0.3; }
}

@keyframes moveVertical {
    0% { transform: translateY(-25%); opacity: 0.3; }
    50% { opacity: 0.8; }
    100% { transform: translateY(25%); opacity: 0.3; }
}

/* ==================== PIXEL STYLE BACKGROUND ==================== */
.bg-pixel {
    background: #1a1c2c;
}

.bg-pixel .bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    animation: bgZoom 30s ease-in-out infinite alternate;
    filter: brightness(0.9) saturate(1.1);
}

@keyframes bgZoom {
    0% { transform: scale(1) translateY(0); }
    100% { transform: scale(1.08) translateY(-2%); }
}

.bg-pixel .bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        180deg,
        rgba(26, 28, 44, 0.3) 0%,
        rgba(26, 28, 44, 0.1) 40%,
        rgba(26, 28, 44, 0.2) 70%,
        rgba(26, 28, 44, 0.6) 100%
    );
}

/* Animated Elements for Pixel Style */
.animated-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-cloud {
    position: absolute;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    filter: blur(20px);
}

.cloud-1 { width: 200px; height: 60px; top: 8%; left: -200px; animation: cloudFloat 40s linear infinite; }
.cloud-2 { width: 150px; height: 45px; top: 15%; left: -150px; animation: cloudFloat 55s linear infinite 10s; }
.cloud-3 { width: 180px; height: 50px; top: 5%; left: -180px; animation: cloudFloat 45s linear infinite 20s; }

@keyframes cloudFloat {
    0% { transform: translateX(0); opacity: 0; }
    5% { opacity: 0.4; }
    95% { opacity: 0.4; }
    100% { transform: translateX(calc(100vw + 400px)); opacity: 0; }
}

.floating-bird {
    position: absolute;
    width: 20px;
    height: 8px;
}

.floating-bird::before,
.floating-bird::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 3px;
    background: rgba(30, 30, 50, 0.6);
    border-radius: 50%;
}

.floating-bird::before { left: 0; animation: wingFlap 0.3s ease-in-out infinite; }
.floating-bird::after { right: 0; animation: wingFlap 0.3s ease-in-out infinite 0.15s; }

@keyframes wingFlap {
    0%, 100% { transform: rotate(-20deg); }
    50% { transform: rotate(20deg); }
}

.bird-1 { top: 12%; left: -30px; animation: birdFly 25s linear infinite; }
.bird-2 { top: 18%; left: -30px; animation: birdFly 30s linear infinite 8s; }

@keyframes birdFly {
    0% { transform: translate(0, 0); }
    25% { transform: translate(25vw, -20px); }
    50% { transform: translate(50vw, 10px); }
    75% { transform: translate(75vw, -15px); }
    100% { transform: translate(110vw, 5px); }
}

.river-shimmer {
    position: absolute;
    bottom: 25%;
    left: 30%;
    width: 40%;
    height: 15%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    animation: riverShimmer 4s ease-in-out infinite;
    filter: blur(3px);
}

@keyframes riverShimmer {
    0%, 100% { opacity: 0.3; transform: translateX(-10px); }
    50% { opacity: 0.6; transform: translateX(10px); }
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: particleFloat 8s ease-in-out infinite;
}

.particle:nth-child(1) { left: 15%; top: 25%; animation-delay: 0s; }
.particle:nth-child(2) { left: 30%; top: 60%; animation-delay: 1.5s; }
.particle:nth-child(3) { left: 50%; top: 35%; animation-delay: 3s; }
.particle:nth-child(4) { left: 70%; top: 70%; animation-delay: 4.5s; }
.particle:nth-child(5) { left: 85%; top: 40%; animation-delay: 6s; }
.particle:nth-child(6) { left: 25%; top: 80%; animation-delay: 7s; }

@keyframes particleFloat {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.3; }
    50% { transform: translateY(-30px) scale(1.5); opacity: 0.8; }
}

/* ==================== FLOW STYLE BACKGROUND ==================== */
.bg-flow {
    background: #0d1117;
}

/* ==================== BLUR OVERLAY ==================== */
.blur-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.blur-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ==================== HEADER ==================== */
.global-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-link {
    text-decoration: none;
}

.logo-text {
    font-family: var(--font-title);
    font-size: 1.8rem;
    color: var(--color-primary);
    text-shadow: var(--shadow-glow);
    transition: color 0.3s ease;
}

/* Hamburger Button */
.hamburger-btn {
    width: 48px;
    height: 48px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    background: var(--bg-glass-dark);
    border: 2px solid var(--border-color-strong);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.hamburger-btn:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.hamburger-line {
    width: 22px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.2s ease;
}

.hamburger-btn:hover .hamburger-line {
    background: var(--color-primary);
}

/* User Icon Button */
.user-icon-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.user-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-glass-dark);
    border: 2px solid var(--border-color-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: all 0.2s ease;
}

.user-icon:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.user-icon-text {
    font-size: 20px;
    font-weight: bold;
    color: var(--text-muted);
}

.user-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: 10px;
}

/* ==================== BUTTONS ==================== */
.btn {
    padding: 12px 24px;
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    outline: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--btn-gradient);
    color: var(--text-on-primary);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--btn-hover-gradient);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-ghost {
    background: var(--bg-glass-dark);
    color: var(--text-primary);
    border: 2px solid var(--border-color-strong);
}

.btn-ghost:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
}

.btn-result {
    background: linear-gradient(135deg, #f4d35e 0%, #ee964b 100%);
    color: #1a1a2e;
    font-size: 16px;
    padding: 14px 30px;
    box-shadow: 0 0 20px rgba(244, 211, 94, 0.4);
}

.btn-result:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(244, 211, 94, 0.6);
}

.btn-start {
    font-size: 18px;
    padding: 18px 45px;
    margin-top: 30px;
    animation: pulse 2s infinite;
}

.btn-icon {
    font-size: 1.2em;
}

@keyframes pulse {
    0%, 100% { box-shadow: var(--shadow-sm); }
    50% { box-shadow: var(--shadow-md), var(--shadow-glow); }
}

.btn-small {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-large {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-apply {
    width: 100%;
    padding: 14px;
    margin-top: 20px;
}

.mini-btn {
    padding: 10px 16px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: var(--bg-glass-dark);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.mini-btn:hover {
    border-color: var(--color-primary);
}

/* Pixel style buttons */
[data-theme="pixel"] .btn {
    border-radius: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 12px;
}

[data-theme="pixel"] .btn:hover {
    transform: translateY(-4px);
}

[data-theme="pixel"] .btn:active {
    transform: translateY(0);
    box-shadow: none;
}

/* Flow style buttons */
[data-theme="flow"] .btn {
    text-shadow: 0 0 10px var(--color-primary);
}

/* Pixel style specific - make everything pixelated */
[data-theme="pixel"] .hamburger-btn,
[data-theme="pixel"] .user-icon,
[data-theme="pixel"] .menu-item,
[data-theme="pixel"] .modal,
[data-theme="pixel"] .side-panel,
[data-theme="pixel"] .container,
[data-theme="pixel"] .feature-card,
[data-theme="pixel"] .material-input,
[data-theme="pixel"] .info-box,
[data-theme="pixel"] .progress-bar,
[data-theme="pixel"] .flashcard-face,
[data-theme="pixel"] .option,
[data-theme="pixel"] .matching-item,
[data-theme="pixel"] .material-card,
[data-theme="pixel"] .toast,
[data-theme="pixel"] .form-input,
[data-theme="pixel"] .search-input,
[data-theme="pixel"] .mini-btn {
    border-radius: 0 !important;
}

[data-theme="pixel"] .main-title {
    text-shadow: 4px 4px 0 rgba(0,0,0,0.3);
    -webkit-text-stroke: 2px rgba(0,0,0,0.2);
}

[data-theme="pixel"] .flashcard {
    border-radius: 0;
}

[data-theme="pixel"] .modal-close-btn,
[data-theme="pixel"] .back-btn,
[data-theme="pixel"] .close-panel-btn {
    border-radius: 0 !important;
}

/* Flow style specific - add glow effects */
[data-theme="flow"] .hamburger-btn:hover,
[data-theme="flow"] .user-icon:hover,
[data-theme="flow"] .menu-item:hover,
[data-theme="flow"] .feature-card:hover {
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}

[data-theme="flow"] .main-title {
    animation: textGlow 2s ease-in-out infinite alternate;
}

@keyframes textGlow {
    from { text-shadow: 0 0 20px rgba(0, 255, 65, 0.5), 0 0 40px rgba(0, 255, 65, 0.3); }
    to { text-shadow: 0 0 30px rgba(0, 255, 65, 0.8), 0 0 60px rgba(0, 255, 65, 0.5); }
}

[data-theme="flow"] .container,
[data-theme="flow"] .modal,
[data-theme="flow"] .side-panel {
    border-color: rgba(0, 255, 65, 0.4);
}

[data-theme="flow"] .form-input:focus,
[data-theme="flow"] .material-input:focus,
[data-theme="flow"] .search-input:focus {
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.3);
}

/* ==================== SIDE PANELS ==================== */
.side-panel {
    position: fixed;
    top: 0;
    width: 320px;
    height: 100%;
    background: var(--bg-glass-dark);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid var(--border-color);
    z-index: 1001;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.side-panel-left {
    left: 0;
    transform: translateX(-100%);
    border-radius: 0 16px 16px 0;
}

.side-panel-left.active {
    transform: translateX(0);
}

.side-panel-right {
    right: 0;
    transform: translateX(100%);
    border-radius: 16px 0 0 16px;
}

.side-panel-right.active {
    transform: translateX(0);
}

.side-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-weight: 600;
    font-size: 18px;
    color: var(--text-primary);
}

.side-panel-header-right {
    justify-content: flex-end;
}

.close-panel-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.close-panel-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--text-primary);
    transition: all 0.2s ease;
}

.close-panel-btn:hover {
    border-color: var(--color-primary);
}

.close-panel-btn:hover svg {
    fill: var(--color-primary);
}

.side-panel-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.side-panel-content-right {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* User Profile Section */
.user-profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px 0;
    gap: 12px;
    width: 100%;
}

.user-profile-icon {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 3px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.profile-placeholder {
    font-size: 40px;
    font-weight: bold;
    color: var(--text-muted);
}

.profile-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-username {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Menu Section */
.menu-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.menu-item:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.menu-item-danger:hover {
    border-color: #ff6b6b;
}

.menu-icon {
    font-size: 22px;
    width: 30px;
    text-align: center;
}

.menu-text {
    flex: 1;
    font-weight: 500;
    font-size: 15px;
    color: var(--text-primary);
}

.menu-arrow {
    font-size: 20px;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.menu-item:hover .menu-arrow {
    color: var(--color-primary);
    transform: translateX(3px);
}

/* ==================== MAIN CONTENT / LANDING ==================== */
.main-content {
    position: relative;
    z-index: 1;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 70px;
}

.center-content {
    text-align: center;
    padding: 20px;
}

.title-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.main-title {
    font-family: var(--font-title);
    font-size: clamp(4rem, 15vw, 10rem);
    color: var(--text-primary);
    text-shadow: var(--shadow-glow);
    letter-spacing: 0.05em;
    transition: all 0.5s ease;
}

/* Flow style title */
[data-theme="flow"] .title-wrapper {
    background: linear-gradient(135deg, #1e1e1e 0%, #2d2d2d 100%);
    padding: 25px 50px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: inset 0 0 50px rgba(0, 255, 65, 0.05), var(--shadow-lg);
}

.title-cursor {
    display: none;
}

[data-theme="flow"] .title-cursor {
    display: inline-block;
    width: 10px;
    height: 1.1em;
    background: var(--color-primary);
    margin-left: 15px;
    animation: cursorBlink 1s step-end infinite;
    box-shadow: 0 0 15px var(--color-primary);
}

@keyframes cursorBlink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

/* ==================== PAGE CONTENT ==================== */
.page-content {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    padding: 90px 20px 30px;
    overflow-y: auto;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.page-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
}

.back-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-glass-dark);
    border: 2px solid var(--border-color);
    color: var(--color-primary);
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-btn:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.page-title {
    font-family: var(--font-title);
    font-size: 1.6rem;
    color: var(--color-primary);
    flex: 1;
}

/* ==================== FEATURE GRID ==================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.feature-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 25px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ==================== INPUT SECTION ==================== */
.material-input {
    width: 100%;
    min-height: 200px;
    padding: 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    line-height: 1.6;
    transition: all 0.2s ease;
}

.material-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(126, 242, 156, 0.2);
}

.material-input::placeholder {
    color: var(--text-muted);
}

.input-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 15px 0;
}

.info-box {
    background: rgba(126, 242, 156, 0.1);
    border-left: 4px solid var(--color-primary);
    border-radius: 8px;
    padding: 12px 15px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

[data-theme="dark"] .info-box {
    background: rgba(255, 255, 255, 0.05);
    border-left-color: var(--color-primary);
}

[data-theme="flow"] .info-box {
    background: rgba(0, 255, 65, 0.1);
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.error-message {
    background: rgba(255, 107, 107, 0.15);
    border: 1px solid rgba(255, 107, 107, 0.5);
    border-radius: 8px;
    padding: 12px;
    color: #ff6b6b;
    margin-top: 15px;
    text-align: center;
}

/* ==================== LEARNING SECTION ==================== */
.progress-container {
    margin-bottom: 25px;
}

.progress-bar {
    width: 100%;
    height: 25px;
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: var(--btn-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-on-primary);
    font-weight: bold;
    font-size: 0.85rem;
    transition: width 0.5s ease;
}

.score-board {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.score-item {
    background: linear-gradient(135deg, rgba(126, 242, 156, 0.2) 0%, rgba(62, 166, 106, 0.3) 100%);
    padding: 12px 20px;
    border-radius: 12px;
    text-align: center;
    min-width: 90px;
}

[data-theme="dark"] .score-item {
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.2) 100%);
}

[data-theme="pixel"] .score-item {
    background: linear-gradient(135deg, rgba(244, 211, 94, 0.2) 0%, rgba(238, 150, 75, 0.3) 100%);
    border-radius: 0;
}

[data-theme="flow"] .score-item {
    background: linear-gradient(135deg, rgba(0, 255, 65, 0.1) 0%, rgba(0, 204, 51, 0.2) 100%);
}

.score-value {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--text-primary);
}

.score-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Learning Modules */
.learning-module {
    display: none;
    animation: fadeIn 0.5s ease;
}

.learning-module.active {
    display: block;
}

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

/* Card Counter */
.card-counter {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 15px;
    font-size: 1rem;
}

/* Flashcard */
#flashcardContainer {
    perspective: 1000px;
    margin-bottom: 20px;
}

.flashcard-wrapper {
    display: flex;
    justify-content: center;
}

.flashcard {
    width: 100%;
    max-width: 500px;
    min-height: 220px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-face {
    position: absolute;
    width: 100%;
    height: 100%;
    min-height: 220px;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    border-radius: 16px;
    text-align: center;
}

.flashcard-front {
    background: var(--btn-gradient);
    color: var(--text-on-primary);
}

.flashcard-back {
    background: var(--bg-secondary);
    border: 3px solid var(--color-primary);
    color: var(--color-primary);
    transform: rotateY(180deg);
}

.flashcard-question {
    font-size: 1.2rem;
    line-height: 1.5;
}

.flashcard-answer {
    font-size: 1.5rem;
    font-weight: bold;
}

.flashcard-hint {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: 15px;
}

/* Flashcard Scoring */
.flashcard-scoring {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.score-btn {
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    color: white;
}

.score-btn.knew {
    background: #28a745;
}

.score-btn.knew:hover {
    background: #218838;
    transform: translateY(-2px);
}

.score-btn.didnt-know {
    background: linear-gradient(135deg, #d86f6f, #a83f3f);
}

.score-btn.didnt-know:hover {
    background: linear-gradient(135deg, #e08080, #b84f4f);
    transform: translateY(-2px);
}

/* Navigation Buttons */
.navigation-btns {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.nav-btn {
    padding: 10px 20px;
    background: var(--bg-glass-dark);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Quiz Styles */
.question-box {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
}

.question-box h3 {
    color: var(--color-primary);
    margin-bottom: 10px;
    font-size: 1rem;
}

.question-text {
    font-size: 1rem;
    margin-bottom: 15px;
    line-height: 1.5;
}

.options {
    display: grid;
    gap: 10px;
}

.option {
    padding: 14px 18px;
    background: var(--bg-glass-dark);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    line-height: 1.4;
}

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

.option.correct {
    background: rgba(40, 167, 69, 0.2);
    border-color: #28a745;
}

.option.incorrect {
    background: rgba(255, 107, 107, 0.2);
    border-color: #ff6b6b;
}

.option.disabled {
    pointer-events: none;
}

/* Matching Styles */
.matching-container h3 {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.matched-pairs {
    margin-bottom: 20px;
}

.matched-pair {
    display: flex;
    background: rgba(40, 167, 69, 0.15);
    border-radius: 8px;
    margin-bottom: 10px;
    overflow: hidden;
    animation: slideDown 0.3s ease;
    border: 1px solid rgba(40, 167, 69, 0.4);
}

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

.matched-pair .question-side,
.matched-pair .answer-side {
    flex: 1;
    padding: 12px;
    font-size: 0.9rem;
    line-height: 1.4;
}

.matched-pair .question-side {
    background: rgba(40, 167, 69, 0.1);
    border-right: 3px solid #28a745;
}

.matching-game {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.matching-column {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.matching-column h4 {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.matching-item {
    padding: 14px;
    background: var(--bg-glass-dark);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
    line-height: 1.4;
}

.matching-item:hover {
    border-color: var(--color-primary);
}

.matching-item.selected {
    background: linear-gradient(135deg, rgba(126, 242, 156, 0.3) 0%, rgba(62, 166, 106, 0.4) 100%);
    border-color: var(--color-primary);
}

[data-theme="dark"] .matching-item.selected {
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.3) 100%);
}

[data-theme="flow"] .matching-item.selected {
    background: linear-gradient(135deg, rgba(0, 255, 65, 0.2) 0%, rgba(0, 204, 51, 0.3) 100%);
}

.matching-item.wrong {
    animation: shake 0.5s;
    background: rgba(255, 107, 107, 0.2);
    border-color: #ff6b6b;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Completion Screen */
.completion-screen {
    text-align: center;
    padding: 30px 20px;
}

.trophy {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.completion-screen h2 {
    color: var(--color-primary);
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.completion-screen > p {
    color: var(--text-muted);
    margin-bottom: 25px;
}

.section-results h3 {
    color: var(--color-primary);
    text-align: center;
    margin-bottom: 15px;
}

.section-result-item {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.section-result-item .section-icon {
    font-size: 1.8rem;
    width: 50px;
    text-align: center;
}

.section-result-item .section-info {
    flex: 1;
}

.section-result-item .section-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.section-result-item .section-score {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.section-result-item .section-percent {
    font-size: 1.4rem;
    font-weight: bold;
    min-width: 60px;
    text-align: right;
}

.section-percent.excellent { color: #28a745; }
.section-percent.good { color: var(--color-primary); }
.section-percent.average { color: #ffc107; }
.section-percent.poor { color: #dc3545; }

.section-progress {
    width: 100%;
    height: 8px;
    background: rgba(255,255,255,0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.section-progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.section-progress-fill.excellent { background: #28a745; }
.section-progress-fill.good { background: var(--color-primary); }
.section-progress-fill.average { background: #ffc107; }
.section-progress-fill.poor { background: #dc3545; }

/* Module Navigation */
.module-navigation {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.finish-row {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

/* ==================== LIBRARY & FAVORITES ==================== */
.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-input {
    flex: 1;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 15px;
    transition: all 0.2s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

.search-btn {
    padding: 14px 20px;
    background: var(--btn-gradient);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s ease;
}

.search-btn:hover {
    transform: translateY(-2px);
}

.library-grid,
.favorites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}

.material-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.2s ease;
}

.material-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
}

.material-card-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 8px;
}

.material-card-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.material-card-actions {
    display: flex;
    gap: 10px;
}

.card-action-btn {
    padding: 8px 14px;
    background: var(--bg-glass-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s ease;
    color: var(--text-primary);
}

.card-action-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.card-action-btn.favorite-active {
    background: rgba(244, 211, 94, 0.2);
    border-color: #f4d35e;
    color: #f4d35e;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 50px 20px;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

.empty-state p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* ==================== MODALS ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-glass-dark);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 30px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal-small {
    max-width: 380px;
}

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

.modal-close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 18px;
    transition: all 0.2s ease;
}

.modal-close-btn:hover {
    border-color: #ff6b6b;
    color: #ff6b6b;
}

.modal-title {
    font-family: var(--font-title);
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 25px;
    text-align: center;
}

/* Style Selection Grid */
.style-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.style-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.style-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.style-card.selected {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.style-preview {
    width: 100%;
    height: 80px;
    border-radius: 8px;
    margin-bottom: 10px;
    overflow: hidden;
}

.style-preview-basic {
    background: #ffffff;
}

.style-preview-basic .preview-grid {
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, rgba(126, 242, 156, 0.2) 1px, transparent 1px),
        linear-gradient(rgba(126, 242, 156, 0.2) 1px, transparent 1px);
    background-size: 15px 15px;
}

.style-preview-dark {
    background: #0a0a0f;
}

.style-preview-dark .preview-grid {
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, rgba(255,255,255,0.15) 1px, transparent 1px),
        linear-gradient(rgba(255,255,255,0.15) 1px, transparent 1px);
    background-size: 15px 15px;
}

.style-preview-pixel {
    background: linear-gradient(180deg, #87ceeb 0%, #6b8e4e 60%, #4a6a3e 100%);
}

.style-preview-flow {
    background: #0d1117;
}

.style-preview-flow .preview-matrix {
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent 0px,
        transparent 8px,
        rgba(0, 255, 65, 0.15) 8px,
        rgba(0, 255, 65, 0.15) 16px
    );
}

.style-name {
    display: block;
    text-align: center;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

/* Language Grid */
.lang-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lang-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    text-align: left;
    font-family: var(--font-body);
    color: var(--text-primary);
}

.lang-card:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.lang-card.active {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.lang-flag {
    font-size: 28px;
}

.lang-name {
    font-size: 16px;
    font-weight: 500;
}

/* FAQ Content */
.faq-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.faq-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
}

.faq-question {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.faq-answer {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

/* Auth Modal */
.auth-modal {
    max-width: 400px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-input {
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

.auth-switch {
    text-align: center;
    margin-top: 15px;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-switch-link {
    color: var(--color-primary);
    cursor: pointer;
    font-weight: 600;
}

.auth-switch-link:hover {
    text-decoration: underline;
}
.auth-hint{
    margin: 0;
    margin-bottom: 15px; 
    font-size: 14px; 
    color: #666; 
    text-align: left;
}
/* Profile Modal */
.profile-modal {
    max-width: 400px;
}

.profile-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.profile-avatar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.profile-avatar-large {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 3px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.avatar-placeholder {
    font-size: 44px;
    font-weight: bold;
    color: var(--text-muted);
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-info {
    width: 100%;
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 18px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-secondary);
    font-size: 14px;
}

.info-value {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
}

/* Module Options */
.module-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 25px;
}

.module-option {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 16px 18px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.module-option:hover {
    border-color: var(--color-primary);
}

.module-option input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
}

.option-icon {
    font-size: 1.5rem;
}

.option-text {
    flex: 1;
    font-weight: 500;
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* ==================== TOAST NOTIFICATIONS ==================== */
.toast-container {
    position: fixed;
    top: 90px;
    right: 20px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--bg-glass-dark);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 20px;
    min-width: 300px;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    transform: translateX(120%);
    animation: toastSlideIn 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
    position: relative;
    overflow: hidden;
}

.toast.toast-out {
    animation: toastSlideOut 0.3s ease forwards;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toast-icon {
    font-size: 1.3em;
    flex-shrink: 0;
}

.toast-message {
    color: var(--text-primary);
    font-size: 0.95em;
    line-height: 1.4;
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--color-primary);
    animation: toastProgress 5s linear forwards;
}

.toast.success { border-color: rgba(40, 167, 69, 0.6); }
.toast.success .toast-icon { color: #28a745; }
.toast.success .toast-progress { background: #28a745; }

.toast.error { border-color: rgba(220, 53, 69, 0.6); }
.toast.error .toast-icon { color: #dc3545; }
.toast.error .toast-progress { background: #dc3545; }

.toast.warning { border-color: rgba(255, 193, 7, 0.6); }
.toast.warning .toast-icon { color: #ffc107; }
.toast.warning .toast-progress { background: #ffc107; }

@keyframes toastSlideIn {
    0% { transform: translateX(120%); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
}

@keyframes toastSlideOut {
    0% { transform: translateX(0); opacity: 1; }
    100% { transform: translateX(120%); opacity: 0; }
}

@keyframes toastProgress {
    0% { width: 100%; }
    100% { width: 0%; }
}

/* ==================== LIBRARY TABS ==================== */
.library-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 15px;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: 2px solid transparent;
    border-radius: 12px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: var(--color-primary);
    background: var(--bg-secondary);
    border-color: var(--color-primary);
}

.tab-icon {
    font-size: 1.1em;
}

.library-actions {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    align-items: stretch;
}

.library-actions .search-box {
    flex: 1;
    margin-bottom: 0;
}

.btn-upload {
    white-space: nowrap;
    padding: 14px 24px;
}

/* ==================== UPLOAD PAGE ==================== */
.upload-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%238a8a9a' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    padding-right: 40px;
}

.upload-textarea {
    min-height: 250px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
}

/* ==================== QUICKLOOK MODAL ==================== */
.quicklook-modal {
    max-width: 600px;
}

.quicklook-header {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.quicklook-icon {
    width: 70px;
    height: 70px;
    background: var(--btn-gradient);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    flex-shrink: 0;
}

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

.quicklook-title {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    word-wrap: break-word;
}

.quicklook-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 13px;
    color: var(--text-muted);
}

.meta-icon {
    font-size: 1em;
}

.category-badge {
    background: var(--bg-secondary);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    color: var(--color-primary);
    border: 1px solid var(--border-color);
}

.quicklook-preview {
    margin-bottom: 20px;
}

.quicklook-preview h3 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.preview-list {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 15px;
    max-height: 250px;
    overflow-y: auto;
}

.preview-item {
    display: flex;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.preview-item:last-child {
    border-bottom: none;
}

.preview-number {
    color: var(--color-primary);
    font-weight: 600;
    min-width: 30px;
}

.preview-content {
    flex: 1;
}

.preview-question {
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 14px;
}

.preview-answer {
    color: var(--text-muted);
    font-size: 13px;
}

.preview-more {
    text-align: center;
    padding: 15px;
    color: var(--text-muted);
    font-style: italic;
    font-size: 13px;
}

.quicklook-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* ==================== MATERIAL CARD ENHANCED ==================== */
.material-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.material-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

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

.material-card-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0;
    flex: 1;
    padding-right: 10px;
}

.material-card-badge {
    font-size: 1.2rem;
}

.material-card-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.material-card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.material-card-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.card-action-btn {
    padding: 8px 14px;
    background: var(--bg-glass-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s ease;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 5px;
}

.card-action-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.card-action-btn.favorite-active {
    background: rgba(244, 211, 94, 0.2);
    border-color: #f4d35e;
    color: #f4d35e;
}

.card-action-btn.delete-btn:hover {
    border-color: #dc3545;
    color: #dc3545;
}

/* Modal text */
.modal-text {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.5;
}

/* ==================== HOME PAGE ==================== */
.home-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

.home-section {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    padding: 25px;
    margin-bottom: 20px;
}

.section-title {
    font-family: var(--font-title);
    font-size: 1.3rem;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.action-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.action-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.action-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.action-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ENT Section */
.ent-section {
    background: linear-gradient(135deg, var(--bg-glass) 0%, rgba(126, 242, 156, 0.1) 100%);
}

[data-theme="dark"] .ent-section {
    background: linear-gradient(135deg, var(--bg-glass) 0%, rgba(255, 255, 255, 0.05) 100%);
}

.ent-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.ent-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.ent-card:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.ent-icon {
    font-size: 1.5rem;
}

.ent-card span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.ent-card-profile {
    border-color: var(--color-primary-dark);
}

.ent-card-full {
    grid-column: span 3;
    justify-content: center;
    background: var(--btn-gradient);
}

.ent-card-full span {
    color: var(--text-on-primary);
    font-weight: 600;
}

/* ==================== LIBRARY FILTERS ==================== */
.library-filters {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.filter-tabs {
    display: flex;
    gap: 5px;
    background: var(--bg-secondary);
    padding: 5px;
    border-radius: 12px;
}

.filter-tab {
    padding: 10px 18px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.filter-tab:hover {
    color: var(--text-primary);
}

.filter-tab.active {
    background: var(--btn-gradient);
    color: var(--text-on-primary);
}

.subject-filter {
    margin-bottom: 15px;
}

.subject-filter select {
    max-width: 300px;
}

/* ==================== RATING PAGE ==================== */
.rating-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.rating-filters select {
    flex: 1;
    min-width: 150px;
}

.rating-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.rating-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.rating-item:hover {
    border-color: var(--color-primary);
}

.rating-item.self {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(126, 242, 156, 0.1) 0%, rgba(62, 166, 106, 0.15) 100%);
}

.rating-position {
    width: 40px;
    height: 40px;
    background: var(--bg-glass-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.rating-item:nth-child(1) .rating-position { background: linear-gradient(135deg, #ffd700, #ffb700); color: #000; }
.rating-item:nth-child(2) .rating-position { background: linear-gradient(135deg, #c0c0c0, #a0a0a0); color: #000; }
.rating-item:nth-child(3) .rating-position { background: linear-gradient(135deg, #cd7f32, #b8720e); color: #fff; }

.rating-user {
    flex: 1;
}

.rating-name {
    font-weight: 600;
    color: var(--text-primary);
}

.rating-school {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.rating-score {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--color-primary);
}

/* ==================== PROFILE PAGE ==================== */
.profile-page-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.profile-details {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 20px;
}

.profile-field {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.profile-field:last-child {
    border-bottom: none;
}

.profile-field label {
    color: var(--text-muted);
    font-size: 14px;
}

.profile-field span {
    color: var(--text-primary);
    font-weight: 500;
}

.profile-field.editable select {
    max-width: 200px;
}

.profile-field-row {
    flex-wrap: wrap;
}

.profile-selects {
    display: flex;
    gap: 10px;
}

.profile-selects select {
    width: 80px;
}

.profile-stats {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 20px;
}

.profile-stats h3 {
    color: var(--color-primary);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.stat-card {
    background: var(--bg-glass-dark);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--color-primary);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ==================== AUTH STEPS ==================== */
.auth-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 25px;
}

.step {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: var(--text-muted);
    font-size: 14px;
    transition: all 0.3s ease;
}

.step.active {
    background: var(--btn-gradient);
    border-color: var(--color-primary);
    color: var(--text-on-primary);
}

.step.completed {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--text-on-primary);
}

.step-line {
    width: 40px;
    height: 3px;
    background: var(--border-color);
}

/* ==================== MULTI-STEP FORM ==================== */
.form-step {
    animation: fadeIn 0.3s ease;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.step-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

/* ==================== UPLOAD TYPE MODAL ==================== */
.upload-type-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.upload-type-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-type-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.upload-type-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.upload-type-card span {
    font-weight: 600;
    color: var(--text-primary);
}

/* ==================== SUBJECT ACTION MODAL ==================== */
.subject-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.subject-action-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 18px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.subject-action-card:hover {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.subject-action-card .action-icon {
    font-size: 1.8rem;
    margin-bottom: 0;
}

.subject-action-card span {
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.subject-action-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

/* ==================== MATERIAL ACTION MODAL ==================== */
.material-actions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.material-action-card {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.material-action-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.material-action-card .action-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.material-action-card span {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

/* ==================== FAQ TABS ==================== */
.faq-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.faq-tab {
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.faq-tab:hover {
    color: var(--text-primary);
}

.faq-tab.active {
    background: var(--btn-gradient);
    color: var(--text-on-primary);
}

.guide-content {
    line-height: 1.6;
}

.guide-step {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 12px;
}

.guide-step h4 {
    color: var(--color-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.guide-step p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==================== MODAL LARGE ==================== */
.modal-large {
    max-width: 600px;
}

/* ==================== EDITOR FORM ==================== */
.editor-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ==================== TEST EDITOR ==================== */
.test-questions {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 15px;
}

.test-question-item {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
}

.test-question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.test-question-header h4 {
    color: var(--color-primary);
}

.test-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.test-option {
    display: flex;
    align-items: center;
    gap: 10px;
}

.test-option input[type="text"] {
    flex: 1;
}

.test-option input[type="radio"] {
    accent-color: var(--color-primary);
}

.profile-school {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ==================== CLASSMATES PAGE ==================== */
.classmates-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 15px 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 2px solid var(--border-color);
}

.class-badge {
    display: flex;
    align-items: center;
    gap: 10px;
}

.class-school {
    font-weight: 500;
    color: var(--text-primary);
}

.class-name {
    background: var(--btn-gradient);
    color: var(--text-on-primary);
    padding: 5px 12px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.9rem;
}

.classmates-count {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.classmates-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.classmate-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.classmate-item:hover {
    border-color: var(--color-primary);
}

.classmate-item.current-user {
    background: linear-gradient(135deg, rgba(126, 242, 156, 0.1) 0%, rgba(62, 166, 106, 0.15) 100%);
    border-color: var(--color-primary);
}

[data-theme="dark"] .classmate-item.current-user {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.1) 100%);
}

.classmate-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--btn-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--text-on-primary);
    overflow: hidden;
}

.classmate-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.classmate-info {
    flex: 1;
}

.classmate-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.you-badge {
    font-size: 0.75rem;
    font-weight: normal;
    color: var(--color-primary);
}

.classmate-subjects {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .global-header {
        padding: 0 15px;
        height: 60px;
    }
    
    .logo-text {
        font-size: 1.5rem;
    }
    
    .side-panel {
        width: 100%;
        border-radius: 0;
    }
    
    .main-title {
        font-size: clamp(3rem, 18vw, 6rem);
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .btn-start {
        padding: 15px 35px;
        font-size: 16px;
    }
    
    .page-content {
        padding: 80px 15px 20px;
    }
    
    .container {
        padding: 20px;
        border-radius: 16px;
    }
    
    .page-header {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .page-title {
        font-size: 1.3rem;
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
    
    .feature-card {
        padding: 18px 15px;
    }
    
    .feature-icon {
        font-size: 2.2rem;
    }
    
    .feature-title {
        font-size: 0.95rem;
    }
    
    .feature-desc {
        font-size: 0.8rem;
    }
    
    /* Library tabs responsive */
    .library-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }
    
    .library-tabs::-webkit-scrollbar {
        display: none;
    }
    
    .tab-btn {
        padding: 10px 15px;
        font-size: 13px;
        white-space: nowrap;
    }
    
    .library-actions {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-upload {
        width: 100%;
        justify-content: center;
    }
    
    /* Quicklook responsive */
    .quicklook-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .quicklook-meta {
        justify-content: center;
    }
    
    .quicklook-actions {
        flex-direction: column;
    }
    
    .quicklook-actions .btn {
        width: 100%;
    }
    
    .matching-game {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .matched-pair {
        flex-direction: column;
    }
    
    .matched-pair .question-side {
        border-right: none;
        border-bottom: 3px solid #28a745;
    }
    
    .modal {
        padding: 25px 20px;
        margin: 10px;
        max-height: 85vh;
    }
    
    .modal-overlay {
        padding: 10px;
    }
    
    .style-grid {
        gap: 10px;
    }
    
    .style-preview {
        height: 60px;
    }
    
    .toast-container {
        right: 10px;
        left: 10px;
        top: 70px;
    }
    
    .toast {
        min-width: auto;
        max-width: none;
    }
    
    /* Input actions responsive */
    .input-actions {
        flex-direction: column;
    }
    
    .mini-btn {
        width: 100%;
        justify-content: center;
    }
    
    /* Card actions responsive */
    .material-card-actions {
        flex-direction: column;
    }
    
    .card-action-btn {
        width: 100%;
        justify-content: center;
    }
    
    /* Score board responsive */
    .score-board {
        gap: 10px;
    }
    
    .score-item {
        padding: 10px 15px;
        min-width: 70px;
    }
    
    .score-value {
        font-size: 1.2rem;
    }
    
    /* Home page responsive */
    .action-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ent-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ent-card-full {
        grid-column: span 2;
    }
    
    /* Rating responsive */
    .rating-filters {
        flex-direction: column;
    }
    
    .rating-filters select {
        width: 100%;
    }
    
    /* Profile responsive */
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-field {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .profile-field.editable select {
        max-width: 100%;
        width: 100%;
    }
    
    .profile-selects {
        width: 100%;
    }
    
    .profile-selects select {
        flex: 1;
    }
    
    /* Auth steps responsive */
    .auth-steps {
        transform: scale(0.9);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    /* Library filters responsive */
    .library-filters {
        flex-direction: column;
    }
    
    .filter-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* Material actions responsive */
    .material-actions-grid {
        grid-template-columns: 1fr;
    }
    
    /* Classmates responsive */
    .classmates-info {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .classmate-item {
        padding: 12px;
    }
    
    .classmate-avatar {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    /* Navigation buttons responsive */
    .navigation-btns {
        flex-direction: row;
        gap: 10px;
    }
    
    .nav-btn {
        flex: 1;
        padding: 12px 15px;
        font-size: 13px;
    }
    
    .module-navigation {
        flex-direction: column;
        gap: 10px;
    }
    
    .module-navigation .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .global-header {
        height: 55px;
        padding: 0 10px;
    }
    
    .hamburger-btn,
    .user-icon {
        width: 42px;
        height: 42px;
    }
    
    .logo-text {
        font-size: 1.2rem;
    }
    
    .auth-buttons {
        gap: 5px;
    }
    
    .auth-buttons .btn {
        padding: 8px 12px;
        font-size: 12px;
    }
    
    .main-title {
        font-size: clamp(2.5rem, 20vw, 5rem);
    }
    
    .page-content {
        padding: 70px 10px 15px;
    }
    
    .container {
        padding: 15px;
    }
    
    .page-title {
        font-size: 1.1rem;
    }
    
    .back-btn {
        width: 38px;
        height: 38px;
        font-size: 18px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .modal-buttons {
        flex-direction: column;
    }
    
    .modal-buttons .btn {
        width: 100%;
    }
    
    .library-grid,
    .favorites-grid {
        grid-template-columns: 1fr;
    }
    
    .material-card {
        padding: 15px;
    }
    
    .material-card-title {
        font-size: 0.95rem;
    }
    
    /* Flashcard responsive */
    .flashcard-face {
        min-height: 180px;
        padding: 20px;
    }
    
    .flashcard-question {
        font-size: 1rem;
    }
    
    .flashcard-answer {
        font-size: 1.2rem;
    }
    
    .flashcard-scoring {
        gap: 10px;
    }
    
    .score-btn {
        padding: 10px 20px;
        font-size: 13px;
    }
    
    /* Quiz responsive */
    .question-box {
        padding: 15px;
    }
    
    .option {
        padding: 12px 14px;
        font-size: 0.9rem;
    }
    
    /* Matching responsive */
    .matching-item {
        padding: 12px;
        font-size: 0.85rem;
    }
    
    /* Upload form responsive */
    .upload-textarea {
        min-height: 200px;
    }
    
    /* Quicklook responsive */
    .quicklook-icon {
        width: 60px;
        height: 60px;
        font-size: 1.6rem;
    }
    
    .quicklook-title {
        font-size: 1.1rem;
    }
    
    .preview-list {
        max-height: 200px;
        padding: 12px;
    }
    
    [data-theme="flow"] .title-wrapper {
        padding: 15px 25px;
    }
    
    [data-theme="flow"] .title-cursor {
        width: 8px;
        margin-left: 10px;
    }
    
    /* Button group responsive */
    .button-group {
        flex-direction: column;
    }
    
    .button-group .btn {
        width: 100%;
    }
}