/* ============================================
   Polly - Web Learn Theme
   Blue (#4AACF3) + White
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

@import url('./app-promo.css');

:root {
    --duo-font: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --duo-blue: #4AACF3;
    --duo-blue-dark: #3B8ED4;
    --duo-blue-light: #7DC4F7;
    --duo-blue-bg: #E8F4FD;
    --duo-green: #58CC02;
    --duo-green-dark: #46A302;
    --duo-yellow: #FFC800;
    --duo-red: #FF4B4B;
    --duo-orange: #FF9600;
    --duo-purple: #CE82FF;
    --duo-bg: #FFFFFF;
    --duo-bg-alt: #F7F7F7;
    --duo-bg-hover: #F0F0F0;
    --duo-border: #E5E5E5;
    --duo-text: #3C3C3C;
    --duo-text-light: #777777;
    --duo-text-white: #FFFFFF;
    --duo-shadow: 0 2px 4px rgba(0,0,0,0.08);
    --duo-shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --duo-shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --duo-radius: 16px;
    --duo-radius-sm: 12px;
    --duo-radius-xs: 8px;
    --duo-transition: all 0.2s ease;
}

/* ===== RESET FOR LEARN PAGES ===== */
.learn-page {
    font-family: var(--duo-font);
    background: var(--duo-bg-alt);
    color: var(--duo-text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.learn-page * { box-sizing: border-box; }
.learn-page a { text-decoration: none; color: inherit; transition: var(--duo-transition); }
.learn-page img { max-width: 100%; height: auto; }

/* ===== HEADER / NAVBAR ===== */
.learn-header {
    background: var(--duo-bg);
    border-bottom: 2px solid var(--duo-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 64px;
}

.learn-header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--duo-blue);
    flex-shrink: 0;
}

.header-logo img {
    width: 38px;
    height: 38px;
    border-radius: 50%;
}

/* NAV LINKS */
.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    border-radius: var(--duo-radius-xs);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--duo-text);
    cursor: pointer;
    border: none;
    background: none;
    transition: var(--duo-transition);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

.nav-link i {
    font-size: 1.1rem;
}

.nav-link .dropdown-arrow {
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}

.nav-item.open .nav-link .dropdown-arrow {
    transform: rotate(180deg);
}

.nav-link-highlight {
    color: var(--duo-blue) !important;
    font-weight: 800 !important;
}

.nav-divider {
    width: 1px;
    height: 24px;
    background: var(--duo-border);
    margin: 0 4px;
}

/* DROPDOWN */
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius-sm);
    box-shadow: var(--duo-shadow-lg);
    min-width: 200px;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
    transform: translateX(-50%) translateY(8px);
    z-index: 1001;
}

.nav-item.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--duo-radius-xs);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--duo-text);
    transition: var(--duo-transition);
}

.dropdown-item:hover {
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

.dropdown-item i {
    font-size: 1rem;
    width: 20px;
    text-align: center;
    color: var(--duo-blue);
}

/* HEADER RIGHT - USER DROPDOWN */
.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

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

.user-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: var(--duo-radius-xs);
    font-family: var(--duo-font);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--duo-text);
    background: none;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--duo-transition);
}

.user-dropdown-toggle:hover {
    background: var(--duo-blue-bg);
    border-color: var(--duo-blue-light);
}

.user-dropdown-wrapper.open .user-dropdown-toggle {
    background: var(--duo-blue-bg);
    border-color: var(--duo-blue);
    color: var(--duo-blue);
}

.user-dropdown-name {
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-dropdown-arrow {
    font-size: 0.7rem;
    transition: transform 0.25s ease;
}

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

.header-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--duo-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    flex-shrink: 0;
}

/* User Dropdown Menu */
.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius-sm);
    box-shadow: var(--duo-shadow-lg);
    min-width: 220px;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.97);
    transform-origin: top right;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    z-index: 1100;
}

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

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--duo-radius-xs);
    font-family: var(--duo-font);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--duo-text);
    cursor: pointer;
    transition: var(--duo-transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    text-decoration: none;
}

.user-dropdown-item:hover {
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

.user-dropdown-item i {
    font-size: 1rem;
    width: 20px;
    text-align: center;
    color: var(--duo-blue);
    flex-shrink: 0;
}

.user-dropdown-divider {
    height: 1px;
    background: var(--duo-border);
    margin: 6px 8px;
}

/* Logout item */
.user-dropdown-logout {
    color: var(--duo-red) !important;
}

.user-dropdown-logout i {
    color: var(--duo-red) !important;
}

.user-dropdown-logout:hover {
    background: rgba(255, 75, 75, 0.08) !important;
    color: var(--duo-red) !important;
}

/* Quiz Submenu */
.user-dropdown-submenu-wrapper {
    position: relative;
}

.user-dropdown-submenu-toggle {
    position: relative;
}

.user-submenu-arrow {
    font-size: 0.65rem !important;
    margin-left: auto;
    transition: transform 0.25s ease;
    color: var(--duo-text-light) !important;
}

.user-dropdown-submenu-wrapper.open .user-submenu-arrow {
    transform: rotate(90deg);
}

.user-dropdown-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 0 0 12px;
}

.user-dropdown-submenu-wrapper.open .user-dropdown-submenu {
    max-height: 400px;
    padding: 4px 0 4px 12px;
}

.user-dropdown-subitem {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--duo-radius-xs);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--duo-text);
    transition: var(--duo-transition);
    text-decoration: none;
}

.user-dropdown-subitem:hover {
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

.user-dropdown-subitem i {
    font-size: 0.85rem;
    width: 18px;
    text-align: center;
    color: var(--duo-blue);
}

.user-dropdown-sub-divider {
    height: 1px;
    background: var(--duo-border);
    margin: 4px 8px;
}


/* ===== MAIN CONTENT ===== */
.learn-main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px 60px;
}

/* ===== BRAND BUTTONS ===== */
.btn-duo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 10px;
    font-family: var(--duo-font);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
    position: relative;
    text-decoration: none;
    line-height: 1.4;
}

.btn-duo-primary {
    background: linear-gradient(135deg, #1cb0f6, #1e88e5);
    color: #FFFFFF;
}
.btn-duo-primary:hover {
    background: linear-gradient(135deg, #1e88e5, #1565c0);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(28, 176, 246, 0.35);
    color: #FFFFFF;
}
.btn-duo-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(28, 176, 246, 0.25);
}

.btn-duo-green {
    background: linear-gradient(135deg, #22C55E, #16A34A);
    color: #FFFFFF;
}
.btn-duo-green:hover {
    background: linear-gradient(135deg, #16A34A, #15803D);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(34, 197, 94, 0.35);
    color: #FFFFFF;
}
.btn-duo-green:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(34, 197, 94, 0.25);
}

.btn-duo-danger {
    background: linear-gradient(135deg, #EF4444, #DC2626);
    color: #FFFFFF;
}
.btn-duo-danger:hover {
    background: linear-gradient(135deg, #DC2626, #B91C1C);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.35);
    color: #FFFFFF;
}
.btn-duo-danger:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(239, 68, 68, 0.25);
}

.btn-duo-outline {
    background: #FFFFFF;
    color: #1E88E5;
    border: 1.5px solid #E2E8F0;
}
.btn-duo-outline:hover {
    background: rgba(28, 176, 246, 0.06);
    border-color: #3AAFFF;
    color: #1565C0;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.btn-duo-outline:active {
    transform: translateY(0);
}

/* ===== PAGE TITLE ===== */
.page-hero {
    text-align: center;
    padding: 40px 0 32px;
}

.page-hero-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 16px;
    color: white;
}

.page-hero h1 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 8px;
}

.page-hero p {
    color: var(--duo-text-light);
    font-size: 1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* ===== CATEGORY FILTER PILLS ===== */
.filter-pills {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.filter-pill {
    padding: 7px 18px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    background: #FFFFFF;
    border: 1.5px solid #E2E8F0;
    color: #64748B;
    text-decoration: none;
}

.filter-pill:hover,
.filter-pill.active {
    background: rgba(58, 175, 255, 0.08);
    border-color: #3AAFFF;
    color: #1E88E5;
}

/* ===== MODULE CARDS (HOME) ===== */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.module-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 28px;
    text-align: center;
    transition: var(--duo-transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    border-bottom: 4px solid var(--duo-border);
}

.module-card:hover {
    border-color: var(--duo-blue-light);
    border-bottom-color: var(--duo-blue);
    transform: translateY(-4px);
    box-shadow: var(--duo-shadow-md);
}

.module-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin: 0 auto 16px;
    color: white;
}

.module-icon.blue { background: var(--duo-blue); }
.module-icon.green { background: var(--duo-green); }
.module-icon.yellow { background: var(--duo-yellow); }
.module-icon.red { background: var(--duo-red); }
.module-icon.orange { background: var(--duo-orange); }
.module-icon.purple { background: var(--duo-purple); }
.module-icon.teal { background: #1CB0F6; }

.module-card h3 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--duo-text);
}

.module-card p {
    font-size: 0.85rem;
    color: var(--duo-text-light);
    margin-bottom: 16px;
}

.module-count {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

/* Module Progress Bar */
.module-progress-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    padding: 0 8px;
}

.module-progress-text {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--duo-blue);
    min-width: 30px;
}

/* Module Quiz Link */
.module-quiz-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: 10px;
    padding: 4px 14px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--duo-orange);
    background: rgba(255,150,0,0.1);
    transition: var(--duo-transition);
}

.module-quiz-link:hover {
    background: rgba(255,150,0,0.2);
    transform: scale(1.05);
}

/* ===== QUICK ACTIONS ===== */
.quick-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.quick-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #1E88E5;
    background: #FFFFFF;
    border: 1.5px solid #E2E8F0;
    transition: all 0.25s ease;
}

.quick-action-btn:hover {
    background: rgba(28, 176, 246, 0.06);
    border-color: #3AAFFF;
    color: #1565C0;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(58, 175, 255, 0.15);
}

/* ===== MODULE TOP BAR (Progress + Quiz) ===== */
.module-top-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 16px 24px;
    margin-bottom: 24px;
}

.module-top-progress {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
}

.module-top-stats {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--duo-text-light);
    white-space: nowrap;
}

/* ===== WELCOME BANNER ===== */
.welcome-banner {
    background: linear-gradient(135deg, var(--duo-blue) 0%, var(--duo-blue-dark) 100%);
    border-radius: var(--duo-radius);
    padding: 36px 40px;
    color: white;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    position: relative;
    overflow: hidden;
}

.welcome-banner::after {
    content: '';
    position: absolute;
    right: -20px;
    top: -20px;
    width: 160px;
    height: 160px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.welcome-text h2 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 6px;
}

.welcome-text p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.welcome-stats {
    display: flex;
    gap: 24px;
    position: relative;
    z-index: 1;
}

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

.welcome-stat-value {
    font-size: 1.6rem;
    font-weight: 800;
}

.welcome-stat-label {
    font-size: 0.75rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== CONTENT CARDS (WORD, READING, etc.) ===== */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.learn-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 24px;
    transition: var(--duo-transition);
    border-bottom: 4px solid var(--duo-border);
}

.learn-card:hover {
    border-color: var(--duo-blue-light);
    border-bottom-color: var(--duo-blue);
    transform: translateY(-2px);
    box-shadow: var(--duo-shadow);
}

.learn-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.learn-card h3 {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--duo-text);
}

.learn-card p {
    color: var(--duo-text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

.difficulty-badge {
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
}

.badge-a1 { background: #E8F8E0; color: var(--duo-green); }
.badge-a2 { background: var(--duo-blue-bg); color: var(--duo-blue); }
.badge-b1 { background: #FFF3D4; color: var(--duo-orange); }
.badge-b2 { background: #FFE0E0; color: var(--duo-red); }
.badge-c1 { background: #F0E0FF; color: var(--duo-purple); }
.badge-c2 { background: #FFE0E0; color: #CC0000; }

/* ===== COMPLETED CARD STYLES ===== */
.completed-card {
    border-color: var(--duo-green) !important;
    border-bottom-color: var(--duo-green-dark) !important;
    background: linear-gradient(135deg, #FFFFFF 0%, #F0FFF0 100%) !important;
}

.completed-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    color: var(--duo-green);
    font-size: 1.4rem;
}

.completed-inline-badge {
    color: var(--duo-green);
    font-size: 1rem;
    margin-left: 6px;
}

/* ===== FLASHCARD ===== */
.flashcard-container {
    perspective: 1000px;
    margin-bottom: 20px;
}

.vocabulary-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 0;
    overflow-wrap: anywhere;
}

.vocabulary-card .flashcard-word { margin: 0; }
.vocabulary-card-link { color: var(--duo-text); text-decoration: none; }
.vocabulary-card-link::after { content: ''; position: absolute; inset: 0; border-radius: var(--duo-radius); }
.vocabulary-card-link:focus-visible { outline: none; }
.vocabulary-card-link:focus-visible::after { outline: 3px solid var(--duo-blue-dark); outline-offset: 4px; }
.vocabulary-card .vocabulary-card-meaning { font-size: 1.05rem; color: var(--duo-text); }
.vocabulary-card-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; }
.vocabulary-card-actions button { position: relative; z-index: 1; padding: 8px 14px; font-size: 0.8rem; }
.vocabulary-card-more { color: var(--duo-blue-dark); font-size: 0.85rem; font-weight: 700; }
.vocabulary-card.completed-card, .word-detail-card.completed-card { border-color: var(--duo-green); }
.word-learned { color: var(--duo-green-dark); font-size: 0.85rem; font-weight: 800; }

/* ===== VOCABULARY & GENERAL LEARNING PAGINATION ===== */
.vocab-pagination,
.learn-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 36px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    user-select: none;
}

.vocab-page-btn,
.learn-page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: #FFFFFF;
    color: #475569;
    border: 1.5px solid #E2E8F0;
    font-family: var(--duo-font);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
}

.vocab-page-btn:hover:not(:disabled),
.learn-page-btn:hover:not(:disabled) {
    background: rgba(28, 176, 246, 0.06);
    border-color: #3AAFFF;
    color: #1E88E5;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(58, 175, 255, 0.15);
}

.vocab-page-btn:active:not(:disabled),
.learn-page-btn:active:not(:disabled) {
    transform: translateY(0);
}

.vocab-page-btn:disabled,
.learn-page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(1);
    transform: none;
    box-shadow: none;
}

.vocab-page-numbers,
.learn-page-numbers {
    display: flex;
    align-items: center;
    gap: 8px;
}

.vocab-page-num,
.learn-page-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    border-radius: 10px;
    background: #FFFFFF;
    color: #475569;
    border: 1.5px solid #E2E8F0;
    font-family: var(--duo-font);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
}

.vocab-page-num:hover:not(.active),
.learn-page-num:hover:not(.active) {
    background: rgba(28, 176, 246, 0.06);
    border-color: #3AAFFF;
    color: #1E88E5;
    transform: translateY(-1px);
}

.vocab-page-num.active,
.learn-page-num.active {
    background: linear-gradient(135deg, #1cb0f6, #1e88e5);
    color: #ffffff;
    border-color: transparent;
    cursor: default;
    box-shadow: 0 2px 8px rgba(28, 176, 246, 0.3);
}

.vocab-page-dots,
.learn-page-dots {
    color: var(--duo-text-light);
    font-weight: 700;
    padding: 0 4px;
    user-select: none;
}

.vocab-page-info,
.learn-page-info {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--duo-text-light);
    margin-left: 6px;
}
.word-detail-main { max-width: 900px; }
.word-breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 24px; font-size: 0.9rem; overflow-wrap: anywhere; }
.word-breadcrumb a { color: var(--duo-blue-dark); font-weight: 700; }
.word-breadcrumb a:hover { text-decoration: underline; }
.word-detail-card { padding: clamp(20px, 4vw, 40px); overflow-wrap: anywhere; }
.word-detail-card:hover { transform: none; box-shadow: none; }
.word-detail-header { padding-bottom: 28px; border-bottom: 2px solid var(--duo-border); }
.word-detail-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; color: var(--duo-text-light); font-size: 0.8rem; }
.word-detail-header h1 { font-size: clamp(2rem, 6vw, 3.25rem); line-height: 1.2; margin: 18px 0; }
.word-detail-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.word-pronunciation { color: var(--duo-text-light); font-size: 1.15rem; }
.word-detail-section { margin-top: 28px; }
.word-detail-section h2 { font-size: 1.15rem; margin-bottom: 12px; }
.word-detail-section p { white-space: pre-line; font-size: 1.05rem; color: var(--duo-text); }
.word-detail-section .word-definition { font-size: 1.65rem; color: var(--duo-blue-dark); font-weight: 800; }
.word-example { padding: 20px; background: var(--duo-blue-bg); border-radius: var(--duo-radius-sm); border-left: 4px solid var(--duo-blue); }
.word-example .word-example-translation { margin-top: 12px; color: var(--duo-text-light); }
.word-detail-footer { margin-top: 32px; padding-top: 24px; border-top: 2px solid var(--duo-border); }

@media (max-width: 360px) {
    .content-grid:has(.vocabulary-card) { grid-template-columns: minmax(0, 1fr); }
}

.flashcard {
    width: 100%;
    min-height: 200px;
    position: relative;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.flashcard-front,
.flashcard-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--duo-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px;
    border: 2px solid var(--duo-border);
    border-bottom: 4px solid var(--duo-border);
}

.flashcard-front {
    background: var(--duo-bg);
}

.flashcard-back {
    background: var(--duo-blue-bg);
    transform: rotateY(180deg);
    border-color: var(--duo-blue-light);
    border-bottom-color: var(--duo-blue);
}

.flashcard.completed-card .flashcard-front {
    border-color: var(--duo-green);
    border-bottom-color: var(--duo-green-dark);
    background: linear-gradient(135deg, #FFFFFF 0%, #F0FFF0 100%);
}

.flashcard-word {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 8px;
}

.flashcard-hint {
    font-size: 0.85rem;
    color: var(--duo-text-light);
}

.flashcard-meaning {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--duo-blue);
    margin-bottom: 12px;
}

.flashcard-example {
    font-size: 0.9rem;
    color: var(--duo-text-light);
    text-align: center;
    font-style: italic;
}

/* ===== EXERCISE CARD ===== */
.exercise-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 28px;
    margin-bottom: 20px;
    border-bottom: 4px solid var(--duo-border);
    transition: var(--duo-transition);
}

.exercise-card:hover {
    border-color: var(--duo-blue-light);
}

.exercise-card h3 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.exercise-prompt {
    background: var(--duo-bg-alt);
    border-radius: var(--duo-radius-xs);
    padding: 20px;
    margin-bottom: 16px;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--duo-text);
    border-left: 4px solid var(--duo-blue);
}

.exercise-answer {
    width: 100%;
    min-height: 120px;
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius-xs);
    padding: 16px;
    font-family: var(--duo-font);
    font-size: 0.95rem;
    color: var(--duo-text);
    background: var(--duo-bg);
    resize: vertical;
    transition: var(--duo-transition);
}

.exercise-answer:focus {
    outline: none;
    border-color: var(--duo-blue);
    box-shadow: 0 0 0 3px rgba(74,172,243,0.15);
}

.sample-answer {
    background: #E8F8E0;
    border-radius: var(--duo-radius-xs);
    padding: 16px;
    margin-top: 12px;
    border-left: 4px solid var(--duo-green);
    display: none;
}

.sample-answer.show { display: block; }

.sample-answer-label {
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--duo-green);
    text-transform: uppercase;
    margin-bottom: 6px;
}

/* ===== TRANSLATE AREA ===== */
.translate-box {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 28px;
    margin-bottom: 20px;
    border-bottom: 4px solid var(--duo-border);
}

.translate-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.translate-lang {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

.translate-arrow {
    color: var(--duo-text-light);
    font-size: 1.2rem;
}

.translate-source {
    background: var(--duo-bg-alt);
    border-radius: var(--duo-radius-xs);
    padding: 20px;
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 16px;
    border-left: 4px solid var(--duo-blue);
}

.translate-feedback.correct {
    background: #E8F8E0;
    color: var(--duo-green);
    display: flex !important;
}

.translate-feedback.wrong {
    background: #FFE0E0;
    color: var(--duo-red);
    display: flex !important;
}

/* ===== EMPTY STATE ===== */
.empty-state-learn {
    text-align: center;
    padding: 60px 20px;
    color: var(--duo-text-light);
}

.empty-state-learn i {
    font-size: 3.5rem;
    margin-bottom: 16px;
    display: block;
    color: var(--duo-border);
}

.empty-state-learn h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--duo-text);
    margin-bottom: 8px;
}

/* ===== PROGRESS BAR ===== */
.progress-bar-container {
    background: var(--duo-border);
    border-radius: 10px;
    height: 12px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--duo-green) 0%, var(--duo-blue) 100%);
    transition: width 0.5s ease;
}

.progress-bar-fill.bar-perfect {
    background: linear-gradient(90deg, #58CC02 0%, #46A302 100%);
}

/* ===== PROGRESS GRID (Progress Page) ===== */
.progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.progress-module-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 24px;
    border-bottom: 4px solid var(--duo-border);
    transition: var(--duo-transition);
}

.progress-module-card:hover {
    border-color: var(--duo-blue-light);
    transform: translateY(-2px);
    box-shadow: var(--duo-shadow);
}

.progress-module-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.progress-module-header .module-icon {
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
    margin: 0;
    flex-shrink: 0;
}

.progress-module-header h3 {
    font-size: 1rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 2px;
}

.progress-count {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--duo-text-light);
}

.progress-module-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
}

.progress-percent {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--duo-blue);
}

/* ===== QUIZ HISTORY SCORE ===== */
.quiz-history-score {
    padding: 4px 14px;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 800;
}

.quiz-history-score.score-perfect {
    background: #E8F8E0;
    color: var(--duo-green);
}

.quiz-history-score.score-good {
    background: #FFF3D4;
    color: var(--duo-orange);
}

.quiz-history-score.score-low {
    background: #FFE0E0;
    color: var(--duo-red);
}

/* ===== QUIZ PAGE ===== */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 24px;
    min-height: calc(100vh - 64px);
    display: flex;
    flex-direction: column;
}

.quiz-progress-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 0;
}

.quiz-close-btn {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    border: 1.5px solid #E2E8F0;
    background: #FFFFFF;
    color: #64748B;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s ease;
}

.quiz-close-btn:hover {
    border-color: #EF4444;
    color: #EF4444;
    background: #FEF2F2;
    transform: translateY(-1px);
}

.quiz-progress-track {
    flex: 1;
    height: 16px;
    background: var(--duo-border);
    border-radius: 10px;
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--duo-green) 0%, #58CC02 100%);
    border-radius: 10px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.quiz-progress-text {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--duo-text-light);
    min-width: 50px;
    text-align: right;
}

/* Quiz Body */
.quiz-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 20px 0;
}

.quiz-question-card {
    display: none;
    animation: quizFadeIn 0.3s ease;
}

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

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

.quiz-question-text {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 32px;
    line-height: 1.6;
    white-space: pre-line;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-option-btn {
    width: 100%;
    padding: 16px 22px;
    border: 1.5px solid #E2E8F0;
    border-radius: 12px;
    background: #FFFFFF;
    color: var(--duo-text);
    font-family: var(--duo-font);
    font-size: 0.95rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.quiz-option-btn:hover:not(.selected):not(.correct-option):not(.wrong-option) {
    border-color: #3AAFFF;
    background: #F8FAFC;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(58, 175, 255, 0.08);
}

.quiz-option-btn.selected {
    border-color: #1E88E5;
    background: #EFF6FF;
    color: #1E88E5;
    box-shadow: 0 0 0 1px #1E88E5;
}

.quiz-option-btn.correct-option {
    border-color: #22C55E !important;
    background: #F0FDF4 !important;
    color: #15803D !important;
    animation: correctPulse 0.4s ease;
}

.quiz-option-btn.wrong-option {
    border-color: #EF4444 !important;
    background: #FEF2F2 !important;
    color: #B91C1C !important;
    animation: wrongShake 0.4s ease;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

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

/* Quiz Bottom Bar */
.quiz-bottom-bar {
    padding: 20px 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.quiz-feedback {
    font-size: 1rem;
    font-weight: 800;
    flex: 1;
}

.quiz-feedback.feedback-correct {
    color: var(--duo-green);
}

.quiz-feedback.feedback-wrong {
    color: var(--duo-red);
}

.quiz-next-btn {
    padding: 12px 30px;
    font-size: 0.95rem;
    border-radius: 10px;
}

.quiz-next-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Quiz Result Screen */
.quiz-result-screen {
    text-align: center;
    padding: 40px 0;
    animation: quizFadeIn 0.5s ease;
}

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

.quiz-result-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 24px;
}

.quiz-score-circle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--duo-blue-bg);
    border: 6px solid var(--duo-blue);
    margin-bottom: 16px;
}

.quiz-score-circle.score-great {
    background: #E8F8E0;
    border-color: var(--duo-green);
}

.quiz-score-circle.score-ok {
    background: #FFF3D4;
    border-color: var(--duo-yellow);
}

.quiz-score-circle.score-bad {
    background: #FFE0E0;
    border-color: var(--duo-red);
}

.quiz-score-num {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    color: var(--duo-text);
}

.quiz-score-total {
    font-size: 1rem;
    font-weight: 700;
    color: var(--duo-text-light);
}

.quiz-result-message {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--duo-text-light);
    margin-bottom: 32px;
}

.quiz-result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Quiz Result Details */
.quiz-result-details {
    max-width: 600px;
    margin: 0 auto 32px;
    text-align: left;
}

.quiz-detail-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--duo-radius-xs);
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 600;
}

.quiz-detail-item.detail-correct {
    background: #E8F8E0;
    border-left: 4px solid var(--duo-green);
}

.quiz-detail-item.detail-wrong {
    background: #FFE0E0;
    border-left: 4px solid var(--duo-red);
}

.quiz-detail-item i {
    font-size: 1.1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

/* ===== PROFILE PAGE ===== */
.profile-hero-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    overflow: hidden;
    margin-bottom: 28px;
    border-bottom: 4px solid var(--duo-border);
    position: relative;
}

.profile-hero-bg {
    height: 100px;
    background: linear-gradient(135deg, var(--duo-blue) 0%, var(--duo-blue-dark) 50%, #2A7ABF 100%);
    position: relative;
}

.profile-hero-bg::after {
    content: '';
    position: absolute;
    right: 40px;
    top: -20px;
    width: 140px;
    height: 140px;
    background: rgba(255,255,255,0.08);
    border-radius: 50%;
}

.profile-hero-bg::before {
    content: '';
    position: absolute;
    left: 60px;
    bottom: -30px;
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
}

.profile-hero-content {
    display: flex;
    align-items: flex-start;
    gap: 24px;
    padding: 0 32px 28px;
    margin-top: -40px;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}

.profile-avatar-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--duo-blue), var(--duo-blue-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.6rem;
    flex-shrink: 0;
    border: 4px solid var(--duo-bg);
    box-shadow: var(--duo-shadow-md);
}

.profile-hero-info {
    flex: 1;
    min-width: 200px;
    padding-top: 44px;
}

.profile-hero-info h1 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 4px;
}

.profile-username, .profile-email, .profile-member-since {
    font-size: 0.85rem;
    color: var(--duo-text-light);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 2px;
}

.profile-username i, .profile-email i, .profile-member-since i {
    color: var(--duo-blue);
    font-size: 0.9rem;
}

.profile-hero-actions {
    padding-top: 50px;
    flex-shrink: 0;
}

/* Profile Stats Row */
.profile-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.profile-stat-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 24px 20px;
    text-align: center;
    border-bottom: 4px solid var(--duo-border);
    transition: var(--duo-transition);
}

.profile-stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--duo-shadow-md);
}

.profile-stat-icon {
    font-size: 1.6rem;
    margin-bottom: 8px;
}

.stat-blue .profile-stat-icon { color: var(--duo-blue); }
.stat-green .profile-stat-icon { color: var(--duo-green); }
.stat-yellow .profile-stat-icon { color: var(--duo-yellow); }
.stat-purple .profile-stat-icon { color: var(--duo-purple); }

.stat-blue:hover { border-color: var(--duo-blue-light); border-bottom-color: var(--duo-blue); }
.stat-green:hover { border-color: #9AE66E; border-bottom-color: var(--duo-green); }
.stat-yellow:hover { border-color: #FFD54F; border-bottom-color: var(--duo-yellow); }
.stat-purple:hover { border-color: #D8A8FF; border-bottom-color: var(--duo-purple); }

.profile-stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 2px;
}

.profile-stat-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--duo-text-light);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* Profile Section Title */
.profile-section-title {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.profile-section-title i {
    color: var(--duo-blue);
}

/* Profile Progress List */
.profile-progress-list {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 8px;
    margin-bottom: 28px;
    border-bottom: 4px solid var(--duo-border);
}

.profile-progress-item {
    padding: 14px 16px;
    border-radius: var(--duo-radius-xs);
    transition: var(--duo-transition);
}

.profile-progress-item:hover {
    background: var(--duo-bg-alt);
}

.profile-progress-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.profile-progress-name {
    flex: 1;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--duo-text);
}

.profile-progress-percent {
    font-weight: 800;
    font-size: 0.85rem;
    color: var(--duo-blue);
    min-width: 35px;
    text-align: right;
}

/* Profile Quick Links */
.profile-quick-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.profile-quick-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius-sm);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--duo-text);
    transition: var(--duo-transition);
}

.profile-quick-link:hover {
    border-color: var(--duo-blue-light);
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
    transform: translateX(4px);
}

.profile-quick-link i:first-child {
    font-size: 1.1rem;
    color: var(--duo-blue);
    width: 24px;
    text-align: center;
}

.profile-quick-link span {
    flex: 1;
}

.profile-quick-link i:last-child {
    font-size: 0.8rem;
    color: var(--duo-text-light);
}

/* ===== SETTINGS PAGE ===== */
.settings-container {
    max-width: 700px;
    margin: 0 auto;
}

.settings-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 28px;
    margin-bottom: 20px;
    border-bottom: 4px solid var(--duo-border);
    transition: var(--duo-transition);
}

.settings-card:hover {
    border-color: var(--duo-blue-light);
}

.settings-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
}

.settings-card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--duo-radius-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.settings-card-header h2 {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 2px;
}

.settings-card-header p {
    font-size: 0.82rem;
    color: var(--duo-text-light);
}

/* Settings Form */
.settings-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.settings-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.settings-form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.settings-form-group label {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--duo-text);
    display: flex;
    align-items: center;
    gap: 6px;
}

.settings-form-group label i {
    color: var(--duo-blue);
    font-size: 0.9rem;
}

.settings-form-group input {
    padding: 12px 16px;
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius-xs);
    font-family: var(--duo-font);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--duo-text);
    transition: var(--duo-transition);
    background: var(--duo-bg);
}

.settings-form-group input:focus {
    outline: none;
    border-color: var(--duo-blue);
    box-shadow: 0 0 0 3px rgba(74,172,243,0.15);
}

.settings-input-disabled {
    background: var(--duo-bg-alt) !important;
    color: var(--duo-text-light) !important;
    cursor: not-allowed;
}

.settings-hint {
    font-size: 0.75rem;
    color: var(--duo-text-light);
    font-weight: 600;
}

.settings-form-actions {
    padding-top: 8px;
}

/* Password Toggle */
.settings-password-wrapper {
    position: relative;
    display: flex;
}

.settings-password-wrapper input {
    flex: 1;
    padding-right: 44px;
}

.settings-toggle-password {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--duo-text-light);
    cursor: pointer;
    padding: 8px;
    font-size: 1rem;
    transition: var(--duo-transition);
}

.settings-toggle-password:hover {
    color: var(--duo-blue);
}

/* Settings Alerts */
.settings-alert {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--duo-radius-xs);
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.settings-alert-success {
    background: #E8F8E0;
    color: var(--duo-green-dark);
    border: 1px solid #B8E6A0;
}

.settings-alert-error {
    background: #FFE0E0;
    color: var(--duo-red);
    border: 1px solid #FFB0B0;
}

/* Settings Account Info Grid */
.settings-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.settings-info-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--duo-bg-alt);
    border-radius: var(--duo-radius-xs);
}

.settings-info-item > i {
    color: var(--duo-blue);
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.settings-info-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--duo-text-light);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 1px;
}

.settings-info-value {
    display: block;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--duo-text);
}

.settings-status-active {
    color: var(--duo-green) !important;
}

/* ===== FOOTER ===== */
.learn-footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--duo-text-light);
    font-size: 0.85rem;
    border-top: 2px solid var(--duo-border);
    background: var(--duo-bg);
}


.learn-footer a { color: var(--duo-blue); font-weight: 700; }
.learn-footer a:hover { text-decoration: underline; }

/* ===== TRANSLATE PAGE ===== */
.tr-lang-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 28px;
}

.tr-lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 10px;
    border: 1.5px solid #E2E8F0;
    background: #FFFFFF;
    font-family: var(--duo-font);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--duo-text);
    cursor: default;
    transition: all 0.25s ease;
}

.tr-lang-btn.active {
    border-color: #3AAFFF;
    background: rgba(58, 175, 255, 0.08);
    color: #1E88E5;
}

.tr-flag {
    font-size: 1.2rem;
}

.tr-flag-sm {
    font-size: 1rem;
}

.tr-swap-btn {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: 1.5px solid #E2E8F0;
    background: #FFFFFF;
    color: #1E88E5;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.tr-swap-btn:hover {
    background: linear-gradient(135deg, #1cb0f6, #1e88e5);
    color: white;
    border-color: transparent;
    transform: rotate(180deg);
    box-shadow: 0 4px 14px rgba(28, 176, 246, 0.3);
}

.tr-swap-btn:active {
    transform: rotate(180deg) scale(0.95);
}

/* Translation Panels */
.tr-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 40px;
}

.tr-panel {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    border-bottom: 4px solid var(--duo-border);
    overflow: hidden;
    transition: var(--duo-transition);
    display: flex;
    flex-direction: column;
}

.tr-panel:hover {
    border-color: var(--duo-blue-light);
    border-bottom-color: var(--duo-blue);
    box-shadow: var(--duo-shadow-md);
}

.tr-panel-source:focus-within {
    border-color: var(--duo-blue);
    border-bottom-color: var(--duo-blue-dark);
    box-shadow: 0 0 0 3px rgba(74,172,243,0.12);
}

.tr-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px 12px;
    border-bottom: 1px solid var(--duo-border);
}

.tr-panel-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--duo-blue);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tr-icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--duo-text-light);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--duo-transition);
}

.tr-icon-btn:hover {
    background: var(--duo-blue-bg);
    color: var(--duo-blue);
}

.tr-textarea {
    width: 100%;
    border: none;
    padding: 20px;
    font-family: var(--duo-font);
    font-size: 1.05rem;
    color: var(--duo-text);
    background: transparent;
    resize: none;
    line-height: 1.7;
    flex: 1;
    min-height: 180px;
}

.tr-textarea:focus {
    outline: none;
}

.tr-textarea::placeholder {
    color: var(--duo-text-light);
    font-weight: 600;
}

.tr-panel-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-top: 1px solid var(--duo-border);
    background: var(--duo-bg-alt);
}

.tr-char-count {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--duo-text-light);
}

.tr-char-count.warning {
    color: var(--duo-orange);
}

.tr-char-count.danger {
    color: var(--duo-red);
}

.tr-translate-btn {
    padding: 10px 24px;
    font-size: 0.9rem;
    border-radius: 10px;
}

.tr-output {
    padding: 20px;
    font-size: 1.05rem;
    color: var(--duo-text);
    line-height: 1.7;
    flex: 1;
    min-height: 180px;
    display: flex;
    align-items: flex-start;
}

.tr-placeholder {
    color: var(--duo-text-light);
    font-weight: 600;
    font-style: italic;
}

/* Loading Animation */
.tr-loading {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    color: var(--duo-blue);
    font-weight: 700;
    font-size: 0.9rem;
    border-top: 1px solid var(--duo-border);
    background: var(--duo-blue-bg);
}

.tr-loading-dots {
    display: flex;
    gap: 4px;
}

.tr-loading-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--duo-blue);
    animation: trDotBounce 1.2s infinite ease-in-out;
}

.tr-loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.tr-loading-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes trDotBounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

/* Copy Toast */
.tr-toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--duo-green);
    color: white;
    padding: 14px 28px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 8px 32px rgba(88, 204, 2, 0.3);
    z-index: 2000;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.tr-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Translation History */
.tr-history-section {
    margin-top: 12px;
}

.tr-history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.tr-history-header h2 {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--duo-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tr-history-header h2 i {
    color: var(--duo-blue);
}

.tr-clear-history-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 8px;
    border: 1.5px solid #FCA5A5;
    background: #FFFFFF;
    font-family: var(--duo-font);
    font-size: 0.82rem;
    font-weight: 600;
    color: #EF4444;
    cursor: pointer;
    transition: all 0.25s ease;
}

.tr-clear-history-btn:hover {
    background: #FEF2F2;
    border-color: #EF4444;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.15);
}

.tr-history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tr-history-item {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius-sm);
    padding: 20px 24px;
    display: grid;
    grid-template-columns: 1fr auto 1fr auto;
    align-items: center;
    gap: 16px;
    transition: var(--duo-transition);
    border-bottom: 3px solid var(--duo-border);
    animation: duoFadeIn 0.3s ease forwards;
}

.tr-history-item:hover {
    border-color: var(--duo-blue-light);
    border-bottom-color: var(--duo-blue);
    transform: translateY(-2px);
    box-shadow: var(--duo-shadow);
}

.tr-history-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.tr-history-lang {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--duo-blue);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.tr-history-content {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--duo-text);
    word-break: break-word;
    line-height: 1.5;
}

.tr-history-arrow {
    color: var(--duo-blue-light);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.tr-history-delete {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--duo-text-light);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--duo-transition);
    flex-shrink: 0;
}

.tr-history-delete:hover {
    background: rgba(255, 75, 75, 0.08);
    color: var(--duo-red);
}

.tr-history-time {
    font-size: 0.7rem;
    color: var(--duo-text-light);
    font-weight: 600;
    margin-top: 2px;
}

.tr-history-empty {
    text-align: center;
    padding: 48px 20px;
    color: var(--duo-text-light);
}

.tr-history-empty i {
    font-size: 3rem;
    margin-bottom: 12px;
    display: block;
    color: var(--duo-border);
}

.tr-history-empty p {
    font-size: 0.95rem;
    font-weight: 600;
}


/* ===== ANIMATIONS ===== */
@keyframes duoFadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.duo-animate {
    animation: duoFadeIn 0.4s ease forwards;
    opacity: 0;
}

.duo-delay-1 { animation-delay: 0.05s; }
.duo-delay-2 { animation-delay: 0.1s; }
.duo-delay-3 { animation-delay: 0.15s; }
.duo-delay-4 { animation-delay: 0.2s; }
.duo-delay-5 { animation-delay: 0.25s; }
.duo-delay-6 { animation-delay: 0.3s; }
.duo-delay-7 { animation-delay: 0.35s; }

/* Complete button animation */
@keyframes completeSuccess {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.btn-complete-content.completing {
    animation: completeSuccess 0.4s ease;
}

/* ===== MOBILE HAMBURGER ===== */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--duo-text);
    cursor: pointer;
    padding: 4px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    .mobile-menu-btn { display: flex; }
    .header-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--duo-bg);
        border-bottom: 2px solid var(--duo-border);
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--duo-shadow-lg);
    }
    .header-nav.open { display: flex; }
    .nav-link { justify-content: flex-start; width: 100%; padding: 12px 16px; }
    .nav-divider { width: 100%; height: 1px; margin: 8px 0; }
    .dropdown-menu {
        position: static;
        transform: none;
        box-shadow: none;
        border: none;
        padding-left: 20px;
        display: none;
    }
    .nav-item.open .dropdown-menu {
        display: block;
        opacity: 1;
        visibility: visible;
        transform: none;
    }
    .modules-grid { grid-template-columns: 1fr 1fr; }
    .content-grid { grid-template-columns: 1fr; }
    .progress-grid { grid-template-columns: 1fr; }
    .welcome-banner { flex-direction: column; text-align: center; padding: 28px 24px; }
    .welcome-stats { justify-content: center; }
    .module-top-bar { flex-direction: column; align-items: stretch; }
    .quiz-question-text { font-size: 1.1rem; }
    .profile-stats-row { grid-template-columns: 1fr 1fr; }
    .profile-hero-content { padding: 0 20px 24px; }
    .profile-hero-actions { padding-top: 0; width: 100%; }
    .settings-form-row { grid-template-columns: 1fr; }
    .settings-info-grid { grid-template-columns: 1fr; }
    .tr-panels { grid-template-columns: 1fr; }
    .tr-history-item { grid-template-columns: 1fr; gap: 12px; }
    .tr-history-arrow { transform: rotate(90deg); justify-self: center; }
}

@media (max-width: 600px) {
    .modules-grid { grid-template-columns: 1fr; }
    .learn-main { padding: 20px 16px 40px; }
    .page-hero h1 { font-size: 1.4rem; }
    .welcome-banner { padding: 24px 20px; }
    .welcome-text h2 { font-size: 1.2rem; }
    .quick-actions { flex-direction: column; }
    .quiz-bottom-bar { flex-direction: column; }
    .quiz-result-actions { flex-direction: column; align-items: stretch; }
    .profile-stats-row { grid-template-columns: 1fr 1fr; }
    .profile-hero-info h1 { font-size: 1.2rem; }
    .profile-avatar-large { width: 64px; height: 64px; font-size: 1.3rem; }
    .settings-card { padding: 20px; }
    .tr-lang-bar { gap: 10px; }
    .tr-lang-btn { padding: 10px 18px; font-size: 0.85rem; }
    .tr-swap-btn { width: 40px; height: 40px; font-size: 1rem; }
    .tr-history-header { flex-direction: column; gap: 12px; align-items: flex-start; }
}

/* ============================================
   PREMIUM BADGE & PREMIUM PAGE STYLES
   ============================================ */

/* Premium Badge (Header) */
.premium-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.65rem;
    font-weight: 900;
    letter-spacing: 1px;
    text-transform: uppercase;
    background: linear-gradient(135deg, #FFD700, #FFA500, #FF8C00);
    color: #FFFFFF;
    box-shadow: 0 2px 8px rgba(255, 165, 0, 0.3);
    animation: premiumShimmer 3s ease-in-out infinite;
    position: relative;
    overflow: hidden;
}

.premium-badge::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 70%
    );
    animation: premiumShine 4s ease-in-out infinite;
}

.premium-badge i {
    font-size: 0.7rem;
}

@keyframes premiumShimmer {
    0%, 100% { box-shadow: 0 2px 8px rgba(255, 165, 0, 0.3); }
    50% { box-shadow: 0 2px 16px rgba(255, 165, 0, 0.5); }
}

@keyframes premiumShine {
    0% { transform: translateX(-100%) rotate(45deg); }
    100% { transform: translateX(100%) rotate(45deg); }
}

/* Premium Dropdown Item */
.user-dropdown-premium {
    color: #FF8C00 !important;
    font-weight: 700 !important;
}

.user-dropdown-premium i {
    color: #FFD700 !important;
}

.user-dropdown-premium:hover {
    background: rgba(255, 165, 0, 0.08) !important;
    color: #FF8C00 !important;
}

/* Premium Avatar Ring */
.header-avatar.premium-avatar {
    background: linear-gradient(135deg, #FFD700, #FF8C00);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.3);
}

/* ===== PREMIUM PAGE ===== */
.premium-hero {
    text-align: center;
    padding: 48px 0 40px;
}

.premium-hero-icon {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.4rem;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, #FFD700, #FF8C00);
    color: white;
    box-shadow: 0 8px 32px rgba(255, 165, 0, 0.3);
    animation: premiumFloat 3s ease-in-out infinite;
}

@keyframes premiumFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.premium-hero h1 {
    font-size: 2rem;
    font-weight: 900;
    color: var(--duo-text);
    margin-bottom: 10px;
}

.premium-hero h1 span {
    background: linear-gradient(135deg, #FFD700, #FF8C00);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.premium-hero p {
    color: var(--duo-text-light);
    font-size: 1.05rem;
    max-width: 550px;
    margin: 0 auto;
}

/* Premium Status Banner */
.premium-status-banner {
    background: linear-gradient(135deg, #FFD700 0%, #FF8C00 100%);
    border-radius: var(--duo-radius);
    padding: 32px 40px;
    color: white;
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    gap: 24px;
    position: relative;
    overflow: hidden;
}

.premium-status-banner::after {
    content: '';
    position: absolute;
    right: -30px;
    top: -30px;
    width: 180px;
    height: 180px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.premium-status-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    flex-shrink: 0;
}

.premium-status-info h2 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.premium-status-info p {
    opacity: 0.9;
    font-size: 0.95rem;
}

/* Premium Plans Grid */
.premium-plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.premium-plan-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 32px;
    text-align: center;
    transition: var(--duo-transition);
    position: relative;
    overflow: hidden;
    border-bottom: 4px solid var(--duo-border);
}

.premium-plan-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--duo-shadow-lg);
}

.premium-plan-card.popular {
    border-color: #FFD700;
    border-bottom-color: #FF8C00;
    box-shadow: 0 8px 32px rgba(255, 165, 0, 0.15);
}

.premium-plan-popular-tag {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #FFD700, #FF8C00);
    color: white;
    padding: 6px 0;
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.premium-plan-card.popular {
    padding-top: 56px;
}

.premium-plan-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin: 0 auto 16px;
    color: white;
}

.premium-plan-name {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 8px;
}

.premium-plan-price {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--duo-text);
    margin-bottom: 4px;
}

.premium-plan-price span {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--duo-text-light);
}

.premium-plan-period {
    font-size: 0.85rem;
    color: var(--duo-text-light);
    margin-bottom: 20px;
}

.premium-plan-features {
    list-style: none;
    padding: 0;
    margin: 0 0 24px;
    text-align: left;
}

.premium-plan-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--duo-text);
    border-bottom: 1px solid #F0F0F0;
}

.premium-plan-features li:last-child {
    border-bottom: none;
}

.premium-plan-features li i {
    font-size: 0.9rem;
    color: var(--duo-green);
    flex-shrink: 0;
}

.premium-plan-features li i.bi-x-lg {
    color: var(--duo-text-light);
}

.btn-premium {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 24px;
    border-radius: 10px;
    font-family: var(--duo-font);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
    text-decoration: none;
}

.btn-premium-gold {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: white;
}

.btn-premium-gold:hover {
    background: linear-gradient(135deg, #D97706, #B45309);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.35);
    color: white;
}

.btn-premium-gold:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.25);
}

.btn-premium-outline {
    background: #FFFFFF;
    color: #D97706;
    border: 1.5px solid #F59E0B;
}

.btn-premium-outline:hover {
    background: rgba(245, 158, 11, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.15);
}

/* Premium Features Section */
.premium-features-section {
    margin-bottom: 48px;
}

.premium-features-title {
    text-align: center;
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 28px;
}

.premium-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.premium-feature-card {
    background: var(--duo-bg);
    border: 2px solid var(--duo-border);
    border-radius: var(--duo-radius);
    padding: 24px;
    text-align: center;
    transition: var(--duo-transition);
}

.premium-feature-card:hover {
    border-color: var(--duo-blue-light);
    transform: translateY(-3px);
    box-shadow: var(--duo-shadow);
}

.premium-feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin: 0 auto 14px;
    color: white;
}

.premium-feature-card h3 {
    font-size: 1rem;
    font-weight: 800;
    color: var(--duo-text);
    margin-bottom: 6px;
}

.premium-feature-card p {
    font-size: 0.85rem;
    color: var(--duo-text-light);
}

/* Profile premium badge */
.profile-premium-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #FFD700, #FF8C00);
    color: white;
    box-shadow: 0 4px 12px rgba(255, 165, 0, 0.3);
}

.profile-premium-badge i {
    font-size: 0.85rem;
}

/* Settings Premium Info */
.premium-info-card {
    background: linear-gradient(135deg, rgba(255,215,0,0.05), rgba(255,140,0,0.08));
    border-color: #FFD700 !important;
}

.premium-info-card .settings-card-icon {
    background: rgba(255,165,0,0.12) !important;
    color: #FF8C00 !important;
}

/* Premium Badge in profile settings */
.settings-premium-status {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: linear-gradient(135deg, rgba(255,215,0,0.08), rgba(255,140,0,0.12));
    border-radius: var(--duo-radius-xs);
    margin-top: 16px;
}

.settings-premium-status i {
    font-size: 1.4rem;
    color: #FFD700;
}

.settings-premium-status .premium-label {
    font-weight: 700;
    color: #FF8C00;
}

.settings-premium-status .premium-date {
    font-size: 0.8rem;
    color: var(--duo-text-light);
}

/* Responsive premium */
@media (max-width: 768px) {
    .premium-plans-grid { grid-template-columns: 1fr; }
    .premium-status-banner { flex-direction: column; text-align: center; padding: 24px 20px; }
    .premium-hero h1 { font-size: 1.5rem; }
}

/* AI Content Generate Styles */
.ai-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}

.ai-modal-overlay.show {
    display: flex;
}

.ai-modal-content {
    background: white;
    width: 90%;
    max-width: 500px;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    animation: modalPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes modalPop {
    0% { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.ai-modal-header {
    padding: 20px 24px;
    border-bottom: 2px solid #f0f0f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, rgba(162, 89, 255, 0.1), rgba(107, 33, 168, 0.1));
}

.ai-modal-header h3 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 800;
    color: #4B1A83;
}

.ai-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #666;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.ai-modal-close:hover {
    color: #f00;
}

.ai-modal-body {
    padding: 24px;
}

/* Spinner for AI Loading */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(162, 89, 255, 0.2);
    border-left-color: #A259FF;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
}

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

/* TTS Highlight Styles */
.tts-word {
    border-radius: 3px;
    transition: background-color 0.1s;
}
.tts-highlight {
    background-color: #ffe066;
    border-radius: 3px;
}

/* ===== FOOTER ===== */
.site-footer {
    background: #1a1a2e;
    color: #fff;
    padding: 40px 0 20px;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.footer-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    color: #1cb0f6;
}

.footer-text {
    font-size: 14px;
    color: #aaa;
    margin: 0;
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #fff;
    text-decoration: none;
    transition: background 0.2s, transform 0.2s;
}

.social-link:hover {
    background: #1cb0f6;
    transform: translateY(-2px);
}

.social-link i {
    font-size: 18px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    color: #aaa;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #1cb0f6;
}

.footer-bottom {
    max-width: 1200px;
    margin: 32px auto 0;
    padding: 20px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: #888;
    margin: 0;
}

.footer-bottom a {
    color: #1cb0f6;
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* ===== DEMO BANNER ===== */
.demo-banner {
    background: linear-gradient(135deg, #fff3cd, #ffe69c);
    border: 2px solid #ffc107;
    border-radius: 12px;
    padding: 12px 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #856404;
    font-size: 0.9rem;
}

.demo-banner i {
    font-size: 1.2rem;
    color: #ffc107;
}

.demo-banner a {
    color: #1cb0f6;
    font-weight: 600;
    text-decoration: none;
}

.demo-banner a:hover {
    text-decoration: underline;
}

.demo-banner strong {
    font-weight: 700;
}

/* ===== HEADER AUTH BUTTONS ===== */
.header-auth-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

.header-auth-buttons .nav-btn-ghost {
    padding: 9px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #475569;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.header-auth-buttons .nav-btn-ghost:hover {
    background: #F1F5F9;
    color: #1A1A2E;
}

.header-auth-buttons .nav-btn-solid {
    padding: 9px 22px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #FFFFFF;
    background: linear-gradient(135deg, #1cb0f6, #1e88e5);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.header-auth-buttons .nav-btn-solid:hover {
    background: linear-gradient(135deg, #1e88e5, #1565c0);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(28, 176, 246, 0.3);
}

/* ===== VOCABULARY PAIRS GRID ===== */
.vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
}

.vocab-pair-card {
    background: #ffffff;
    border: 1.5px solid #e2e8f0;
    border-radius: 12px;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
    transition: all 0.2s ease;
}

.vocab-pair-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    border-color: #cbd5e1;
}

.vocab-pair-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.btn-vocab-speak {
    background: #f1f5f9;
    border: none;
    color: #64748b;
    border-radius: 8px;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.15s ease;
    padding: 0;
    font-size: 1rem;
}

.btn-vocab-speak:hover {
    background: var(--duo-blue, #4AACF3);
    color: #ffffff;
}

.vocab-eng {
    font-weight: 700;
    color: #1e293b;
    font-size: 0.96rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.vocab-arrow {
    color: #94a3b8;
    font-size: 1.15rem;
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.vocab-tr {
    font-weight: 600;
    color: #0284c7;
    font-size: 0.92rem;
    text-align: right;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-left: auto;
}

@media (max-width: 576px) {
    .vocab-grid {
        grid-template-columns: 1fr;
    }
    .vocab-eng, .vocab-tr {
        white-space: normal;
    }
}

/* ==========================================================================
   RELATED CONTENT & CROSS-MODULE RECOMMENDATIONS (ENGAGEMENT BOOST)
   ========================================================================== */
.related-content-section {
    margin-top: 36px;
    padding-top: 28px;
    border-top: 2px solid #E2E8F0;
}

.related-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.related-section-title {
    font-size: 1.35rem;
    font-weight: 800;
    color: #1E293B;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.related-section-title i {
    color: #3AAFFF;
    font-size: 1.4rem;
}

.related-section-subtitle {
    font-size: 0.9rem;
    color: #64748B;
    margin: 4px 0 0 0;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.related-card {
    background: #FFFFFF;
    border: 1.5px solid #E2E8F0;
    border-radius: 16px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.related-card:hover {
    transform: translateY(-4px);
    border-color: #3AAFFF;
    box-shadow: 0 10px 24px rgba(58, 175, 255, 0.14);
}

.related-card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.related-card-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
}

.related-card-category {
    font-size: 0.8rem;
    font-weight: 600;
    color: #64748B;
    background: #F1F5F9;
    padding: 3px 8px;
    border-radius: 6px;
}

.related-card-title {
    font-size: 1.12rem;
    font-weight: 800;
    color: #0F172A;
    margin: 0 0 6px 0;
    line-height: 1.35;
}

.related-card-desc {
    font-size: 0.9rem;
    color: #475569;
    margin: 0 0 14px 0;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.86rem;
    font-weight: 700;
    color: #1E88E5;
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid #F1F5F9;
}

.related-card-footer i {
    transition: transform 0.2s ease;
}

.related-card:hover .related-card-footer i {
    transform: translateX(4px);
}

/* Mini word chip in related words */
.related-word-card {
    background: #FFFFFF;
    border: 1.5px solid #E2E8F0;
    border-radius: 14px;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
    transition: all 0.2s ease;
}

.related-word-card:hover {
    transform: translateY(-3px);
    border-color: #3AAFFF;
    background: #F8FAFC;
    box-shadow: 0 6px 16px rgba(58, 175, 255, 0.12);
}

.related-word-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.related-word-eng {
    font-size: 1.05rem;
    font-weight: 800;
    color: #0F172A;
}

.related-word-tr {
    font-size: 0.88rem;
    font-weight: 600;
    color: #0284C7;
}

/* Cross-Module Discovery Strip */
.cross-discovery-banner {
    background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
    border: 1.5px solid #BAE6FD;
    border-radius: 18px;
    padding: 24px;
    margin-top: 32px;
}

.cross-discovery-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.cross-discovery-header h4 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 800;
    color: #0369A1;
}

.cross-discovery-header p {
    margin: 0;
    font-size: 0.88rem;
    color: #0284C7;
}

.cross-discovery-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.cross-link-card {
    background: #FFFFFF;
    border: 1px solid #BAE6FD;
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #0F172A;
    font-weight: 700;
    font-size: 0.92rem;
    transition: all 0.2s ease;
}

.cross-link-card i {
    font-size: 1.3rem;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cross-link-card.reading i { background: #E0F2FE; color: #0284C7; }
.cross-link-card.listening i { background: #FEE2E2; color: #DC2626; }
.cross-link-card.grammar i { background: #FEF3C7; color: #D97706; }
.cross-link-card.speaking i { background: #DCFCE7; color: #16A34A; }
.cross-link-card.vocabulary i { background: #F3E8FF; color: #9333EA; }

.cross-link-card:hover {
    transform: translateY(-2px);
    border-color: #3AAFFF;
    box-shadow: 0 4px 14px rgba(0,0,0,0.06);
    color: #1E88E5;
}