/* ==================== INLINE STYLE MIGRATIONS ==================== */
.room-code-input {
    text-transform: uppercase;
    font-size: 1.5rem;
    text-align: center;
    letter-spacing: 0.3em;
}

.favorites-quiz-action {
    margin-bottom: 16px;
}

.gpt-button-container {
    margin-top: 20px;
    text-align: center;
}

.gpt-explain-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.gpt-explain-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.gpt-explain-btn:active {
    transform: scale(0.97);
}

.dict-example {
    font-style: italic;
    color: var(--text-secondary);
    margin-top: 4px;
}

.dict-tureng-link {
    margin-top: 12px;
}

.distribution-total {
    background: var(--accent-glow);
}

.feedback-success-msg {
    text-align: center;
    padding: 16px;
    color: var(--success);
}

/* ==================== SWIPE HINTS ==================== */
.swipe-hint-banner {
    display: none;
    text-align: center;
    padding: 6px 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
    gap: 6px;
    align-items: center;
    justify-content: center;
}

.swipe-hint-banner.hidden {
    display: none !important;
}

.swipe-hint-banner .swipe-arrow {
    font-size: 0.9rem;
}

.swipe-hint-dismiss {
    margin-left: 4px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

@media (max-width: 768px) {
    .swipe-hint-banner {
        display: flex;
    }
}

/* ==================== AUTH FORM VALIDATION ==================== */
.form-group input.input-error,
.form-group select.input-error {
    border-color: var(--error) !important;
    box-shadow: 0 0 0 2px rgba(255, 118, 117, 0.15);
}

.form-group input.input-success,
.form-group select.input-success {
    border-color: var(--success) !important;
    box-shadow: 0 0 0 2px rgba(0, 206, 201, 0.15);
}

.form-group .field-hint {
    font-size: 0.75rem;
    margin-top: 4px;
    min-height: 1em;
    transition: color 0.2s;
}

.form-group .field-hint.hint-error {
    color: var(--error);
}

.form-group .field-hint.hint-success {
    color: var(--success);
}

.auth-form .form-group {
    transition: transform 0.15s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

.form-group.shake {
    animation: shake 0.3s ease;
}

/* ==================== QUIZ UI COMPACT (MOBILE) ==================== */
@media (max-width: 768px) {
    .question-meta-row {
        margin-bottom: 2px;
        gap: 4px;
    }

    .question-category-badge {
        font-size: 0.68rem;
        padding: 2px 8px;
    }

    .community-solve-rate {
        font-size: 0.65rem;
        padding: 2px 8px;
    }

    .history-indicator {
        font-size: 0.72rem;
        padding: 2px 0;
    }

    .quiz-session-status {
        order: 4;
        width: 100%;
        font-size: 0.75rem;
        min-height: 36px;
        padding: 6px 10px;
    }

    .question-actions {
        gap: 6px;
        padding: 6px 0;
        margin-top: 8px;
    }

    .rating-label {
        display: none;
    }

    .question-rating {
        justify-content: center;
        width: 100%;
    }

    .star-rating {
        gap: 4px;
    }

    .feedback-report-btn {
        font-size: 0.75rem;
    }

    .avg-rating {
        font-size: 0.72rem;
    }

    .favorite-btn {
        min-width: 44px;
        min-height: 44px;
        font-size: 1.2rem;
    }

    .hint-area {
        margin-bottom: 4px;
    }

    .btn-hint {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}

/* ==================== TOUCH TARGET FIXES (min 44x44px) ==================== */
@media (max-width: 768px) {
    .option-strikethrough-btn {
        width: 44px;
        height: 44px;
        font-size: 0.9rem;
        opacity: 0.8;
    }

    .star-btn {
        padding: 8px;
        font-size: 1.5rem;
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .kw-learn-btn {
        padding: 10px 16px;
        font-size: 0.8rem;
        min-height: 44px;
    }

    .uw-word-remove {
        padding: 8px 12px;
        min-width: 44px;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .btn-small {
        min-height: 40px;
        min-width: 40px;
        padding: 8px 14px;
    }

    .modal-close {
        min-width: 44px;
        min-height: 44px;
        font-size: 1.5rem;
    }

    .feedback-report-btn {
        min-height: 44px;
        padding: 10px 16px;
    }

    .option-select-btn {
        min-height: 44px;
        min-width: 44px;
        padding: 10px 16px;
    }

    .quiz-actions {
        gap: 10px;
        padding-top: 10px;
    }

    .quiz-actions .btn {
        flex: 1;
        min-width: 0;
    }

    .flashcard-action-btn {
        min-height: 48px;
        padding: 12px 20px;
    }

    .friend-actions .btn {
        min-width: 44px;
        min-height: 44px;
        padding: 8px 12px;
    }

    .profile-section-toggle {
        min-height: 48px;
        padding: 14px 8px;
    }

    .lb-type-btn {
        min-height: 40px;
        padding: 8px 16px;
    }
}

/* ==================== BOTTOM NAV RESPONSIVE ==================== */
@media (max-width: 768px) {
    .bottom-nav {
        display: flex;
        justify-content: space-around;
        align-items: stretch;
    }

    .app-wrapper .tabs {
        display: none !important;
    }

    .app-wrapper .container {
        padding-bottom: calc(62px + env(safe-area-inset-bottom));
    }

    .gpt-panel-toggle {
        bottom: calc(70px + env(safe-area-inset-bottom)) !important;
    }

    body.quiz-active .bottom-nav {
        display: none !important;
    }

    body.quiz-active .app-wrapper .container {
        padding-bottom: 0;
    }

    body.quiz-active .gpt-panel-toggle {
        bottom: calc(24px + env(safe-area-inset-bottom)) !important;
    }
}

/* ==================== LANDING PAGE ==================== */
.landing-page {
    min-height: 100vh;
    background: var(--bg-primary);
    overflow-x: hidden;
}

.landing-page.hidden {
    display: none;
}

/* Landing Nav */
.landing-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
}

.landing-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Hero Section */
.landing-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 40px 80px;
    position: relative;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(108, 92, 231, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(0, 206, 201, 0.1) 0%, transparent 50%),
        var(--bg-primary);
}

.hero-content {
    max-width: 800px;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.hero-title .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

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

.btn-outline:hover {
    background: var(--accent);
    color: white;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Features Section */
.landing-features {
    padding: 100px 40px;
    background: var(--bg-secondary);
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* How It Works Section */
.landing-how {
    padding: 100px 40px;
    background: var(--bg-primary);
}

.steps-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.step-item {
    text-align: center;
    flex: 1;
    min-width: 200px;
    max-width: 280px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin: 0 auto 20px;
}

.step-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.step-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.step-connector {
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* CTA Section */
.landing-cta {
    padding: 100px 40px;
    background: 
        radial-gradient(ellipse at center, rgba(108, 92, 231, 0.2) 0%, transparent 70%),
        var(--bg-secondary);
    text-align: center;
}

.cta-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.cta-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* Landing Footer */
.landing-footer {
    padding: 30px 40px;
    text-align: center;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}

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

/* Landing Page Responsive */
@media (max-width: 768px) {
    .landing-nav {
        padding: 16px 20px;
    }
    
    .landing-hero {
        padding: 100px 20px 60px;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .landing-features,
    .landing-how,
    .landing-cta {
        padding: 60px 20px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step-connector {
        display: none;
    }
    
    .steps-container {
        flex-direction: column;
        gap: 40px;
    }
}