:root {
    /*
       Pastel Rainbow Palette #09 (Exact Hex Values)
       #FAEDCB - Pastel Butter (Soft Cream Yellow)
       #C9E4DE - Pastel Mint (Fresh Soft Sage)
       #C6DEF1 - Pastel Sky Blue (Powder Blue)
       #DBCDF0 - Pastel Lavender (Soft Lilac / Periwinkle)
       #F2C6DE - Pastel Pink (Blush Rose)
       #F7D9C4 - Pastel Peach (Warm Soft Apricot)

       Author note: According to some, the fact that I declared these colors with both the color code and a short description of each color above like this means that they are AI generated. They are not. Thanks. Bye.
    */
    --pastel-butter: #FAEDCB;
    --pastel-mint: #C9E4DE;
    --pastel-blue: #C6DEF1;
    --pastel-lavender: #DBCDF0;
    --pastel-pink: #F2C6DE;
    --pastel-peach: #F7D9C4;


    --bg-page: #FAF8F5;
    --bg-card: #FFFFFF;
    --bg-card-alt: #F4F1EC;
    --text-main: #2C3842;
    --text-muted: #5F7081;
    --text-light: #8C9DAE;
    --border-color: #E8E3DA;
    --border-subtle: #DCD6CC;

    /*
       Accessible deep contrast tones for text & interactive states
    */
    --color-blue-dark: #386489;
    --color-blue-hover: #2B4E6C;
    --color-mint-dark: #3A6F65;
    --color-pink-dark: #8E446B;
    --color-lavender-dark: #624B86;
    --color-peach-dark: #8A573A;
    --color-butter-dark: #7A5F1C;

    /*
       Primary Accent Mapping (Pastel Sky Blue #C6DEF1)
    */
    --primary-pastel: var(--pastel-blue);
    --primary-pastel-border: #ADCDE5;
    --primary-pastel-hover: #B5D5EB;
    --primary-pastel-dark: var(--color-blue-dark);

    /*
       Mint Slot (#C9E4DE)
    */
    --pastel-sage: var(--pastel-mint);
    --pastel-sage-light: #EFF8F5;
    --pastel-sage-border: var(--pastel-mint);
    --pastel-sage-dark: var(--color-mint-dark);

    /*
       Pink Slot (#F2C6DE)
    */
    --pastel-coral: var(--pastel-pink);
    --pastel-coral-light: #FAF2F7;
    --pastel-coral-border: var(--pastel-pink);
    --pastel-coral-dark: var(--color-pink-dark);

    /*
       Butter Slot (#FAEDCB)
    */
    --pastel-butter-light: #FDFCF7;
    --pastel-butter-border: var(--pastel-butter);
    --pastel-butter-dark: var(--color-butter-dark);

    /*
       Lavender Slot (#DBCDF0)
    */
    --pastel-lavender-light: #F7F3FB;
    --pastel-lavender-border: var(--pastel-lavender);
    --pastel-lavender-dark: var(--color-lavender-dark);

    /*
       Peach Slot (#F7D9C4)
    */
    --pastel-peach-light: #FAF3EE;
    --pastel-peach-border: var(--pastel-peach);
    --pastel-peach-dark: var(--color-peach-dark);

    /*
       Aqua Slot (#C9E4DE)
    */
    --pastel-aqua: var(--pastel-mint);
    --pastel-aqua-light: #EFF8F5;
    --pastel-aqua-border: var(--pastel-mint);
    --pastel-aqua-dark: var(--color-mint-dark);

    /*
       Particle Blue Slot (#C6DEF1)
    */
    --pastel-blue-light: #F0F6FB;
    --pastel-blue-border: var(--pastel-blue);
    --pastel-blue-dark: var(--color-blue-dark);

    /*
       Radii
    */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    /*
       Typography
    */
    --font-main: 'Nunito', Roboto, sans-serif;
    --font-heading: 'Quicksand', 'Nunito', sans-serif;
    --font-thai-modern: 'Kanit', sans-serif;
    --font-thai-classic: 'Sarabun', 'TH Sarabun New', Tahoma, sans-serif;
    --font-thai: var(--font-thai-modern);
}

::-moz-selection {
    color: #fff;
    background: #8DB9FF;
    background-image: none;
    -webkit-text-fill-color: #fff;
}

::selection {
    color: #fff;
    background: #8DB9FF;
    background-image: none;
    -webkit-text-fill-color: #fff;
}


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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/*
   Keep author display rules from exposing inactive quiz controls.
*/
[hidden] {
    display: none !important;
}

[id] {
    scroll-margin-top: 90px;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.gender-variant--female {
    display: none;
}

html[data-speaker-gender="female"] .gender-variant--male {
    display: none;
}

html[data-speaker-gender="female"] .gender-variant--female {
    display: inline;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}


/*
   Header & Navigation (Site Top Nav Bar Only)
*/
header.site-header {
    background-color: var(--bg-card);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 74px;
    gap: 16px;
}

.brand {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

div.brand {
    cursor: default;
    user-select: none;
}

a.brand {
    text-decoration: none;
    cursor: pointer;
}

.brand-logo {
    height: 46px;
    width: auto;
    max-height: 48px;
    object-fit: contain;
    display: block;
}

.brand-icon {
    width: 44px;
    height: 44px;
    background-color: var(--pastel-mint);
    border: 2px solid #AED8CF;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.brand-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 16px;
    list-style: none;
}

.nav-links a {
    font-weight: 700;
    font-size: 15px;
    color: var(--text-main);
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    background-color: var(--pastel-lavender-light);
    color: var(--color-lavender-dark);
}

.nav-links a:hover,
.mobile-nav-links a:hover .nav-text,
.footer-links a:hover,
.footer-bottom a:hover {
    text-decoration: underline;
    text-underline-offset: 0.18em;
}

.nav-badge {
    background-color: var(--pastel-mint);
    color: var(--text-main);
    border: 1.5px solid #AED8CF;
    font-size: 13px;
    font-weight: 800;
    padding: 6px 14px;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/*
   Mobile Hamburger Navigation & Drawer
*/
.nav-hamburger-btn {
    flex-shrink: 0;
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    width: 44px;
    height: 44px;
    padding: 10px;
    gap: 5px;
    background-color: var(--bg-page);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
    -webkit-tap-highlight-color: transparent;
}

.nav-hamburger-btn:hover {
    background-color: var(--pastel-lavender-light);
    border-color: var(--pastel-lavender);
}

.nav-hamburger-btn:active {
    transform: scale(0.95);
}

.hamburger-bar {
    display: block;
    width: 22px;
    height: 2.5px;
    background-color: var(--text-main);
    border-radius: 2px;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease;
    transform-origin: center;
}

/*
   Transform 3 bars into X when active
*/
.nav-hamburger-btn.is-active .hamburger-bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.nav-hamburger-btn.is-active .hamburger-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-hamburger-btn.is-active .hamburger-bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/*
   Mobile Nav Drawer Dropdown
*/
.mobile-nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    display: none;
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    background-color: var(--bg-card);
    border-top: 1.5px solid transparent;
    transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease, visibility 0.35s, border-color 0.2s;
    box-shadow: 0 12px 28px -6px rgba(0, 0, 0, 0.08);
}

.mobile-nav-menu.is-open {
    max-height: min(520px, calc(100vh - 76px));
    max-height: min(520px, calc(100dvh - 76px));
    overflow-y: auto;
    overscroll-behavior-y: contain;
    opacity: 1;
    visibility: visible;
    border-top-color: var(--border-color);
}

.mobile-nav-links {
    list-style: none;
    padding: 14px 0 18px 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.mobile-nav-links li {
    width: 100%;
}

.mobile-nav-links a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 18px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
}

.mobile-nav-links a .nav-icon {
    font-size: 20px;
    width: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav-links a .nav-text {
    flex: 1;
}

.mobile-nav-links a:hover {
    background-color: var(--bg-page);
    color: var(--text-main);
}

.mobile-nav-links a.active {
    background-color: var(--pastel-lavender-light);
    color: var(--color-lavender-dark);
    font-weight: 800;
}

.mobile-nav-links a.active::after {
    content: "•";
    font-size: 22px;
    color: var(--pastel-lavender);
    margin-left: auto;
    line-height: 1;
}

/*
   Hero Section
*/
.hero {
    padding: 56px 0 44px 0;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--pastel-lavender-light);
    color: var(--color-lavender-dark);
    border: 1.5px solid var(--pastel-lavender);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 42px;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.25;
    max-width: 820px;
    margin: 0 auto 18px auto;
}

.hero-title .highlight {
    color: inherit;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 680px;
    margin: 0 auto 32px auto;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 26px;
    font-size: 16px;
    font-weight: 800;
    border-radius: var(--radius-md);
    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.btn-primary {
    background-color: var(--bg-card);
    color: var(--text-main);
    border: 2px solid var(--primary-pastel-border);
}

.btn-primary:hover {
    background-color: var(--pastel-blue-light);
    border-color: var(--pastel-blue);
    color: var(--text-main);
}

.btn-outline {
    background-color: var(--bg-card);
    color: var(--text-main);
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    background-color: var(--pastel-blue-light);
    border-color: var(--pastel-blue);
    color: var(--text-main);
}

/*
   Polite Particle Guide (Krub vs Ka)
*/
.particle-guide {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 56px;
}

.guide-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.guide-title {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
}

.guide-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: 20px;
}

.particle-card {
    background-color: var(--bg-page);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 22px;
}

.particle-chip {
    display: inline-block;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-weight: 800;
    font-size: 13px;
    margin-bottom: 12px;
}

.chip-male {
    background-color: var(--pastel-blue-light);
    color: var(--pastel-blue-dark);
    border: 1px solid var(--pastel-blue-border);
}

.chip-female {
    background-color: var(--pastel-coral-light);
    color: var(--pastel-coral-dark);
    border: 1px solid var(--pastel-coral-border);
}

.particle-thai {
    font-family: var(--font-thai);
    font-size: 26px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
}

.particle-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.55;
}

/*
   Category Tabs & Phrase Cards
*/
.section-header {
    text-align: center;
    margin-bottom: 36px;
}

.section-subtitle {
    display: inline-block;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--pastel-coral-dark);
    margin-bottom: 6px;
}

.classes-section-subtitle {
    display: block;
    text-align: center;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 30px;
    font-weight: 700;
    color: var(--text-main);
}

.category-nav-label {
    margin-bottom: 12px;
    text-align: center;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
}

.category-nav {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.cat-btn {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    padding: 10px 20px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 15px;
    font-family: inherit;
    line-height: inherit;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
}

.cat-btn:hover {
    border-color: var(--pastel-blue);
    background-color: var(--pastel-blue-light);
    color: var(--text-main);
}

.cat-btn:focus-visible {
    outline: 2px solid var(--text-main);
    outline-offset: 2px;
}

.cat-btn.active {
    background-color: var(--pastel-blue);
    border-color: var(--primary-pastel-border);
    color: var(--text-main);
    font-weight: 800;
}

.phrase-section {
    display: none;
    margin-bottom: 48px;
}

.phrase-section.active {
    display: block;
}

.topic-search-form {
    padding: 24px;
    margin: 24px 0 28px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
}

.topic-search-form label {
    display: block;
    font-weight: 700;
    font-size: 18px;
}

.topic-search-help {
    margin: 8px 0 16px;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
}

.topic-search-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.topic-search-controls input {
    flex: 1 1 220px;
    min-width: 0;
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text-main);
    font: inherit;
    font-size: 16px;
}

.topic-search-controls input:focus-visible {
    outline: 2px solid var(--color-blue-dark);
    outline-offset: 2px;
}

.topic-search-error {
    margin: 12px 0 0;
    color: var(--color-pink-dark);
}

.topic-search-status,
.search-results-header {
    overflow-wrap: anywhere;
}

.phrase-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 28px;
}

@media (max-width: 768px) {
    .phrase-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

.phrase-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.15s ease;
    min-height: 230px;
    text-decoration: none;
    color: inherit;
}

/*
   Only whole-card actions share the interactive border and pointer cursor.
*/
.card-clickable,
a.tip-card[href],
.preferences-card.is-collapsed,
.class-summary-card:not([open]),
.class-goals-card:not([open]),
.topic-seo-content:not([open]),
.quiz-answer-option:not(:disabled) {
    cursor: pointer;
}

.card-clickable:is(:hover, :focus-visible),
.card-clickable:has(.open-class-link:focus-visible),
a.tip-card[href]:is(:hover, :focus-visible),
.preferences-card.is-collapsed:hover,
.preferences-card.is-collapsed:has(> .preferences-collapsed-bar:focus-visible),
.class-summary-card:not([open]):hover,
.class-summary-card:not([open]):has(> summary:focus-visible),
.class-goals-card:not([open]):hover,
.class-goals-card:not([open]):has(> summary:focus-visible),
.topic-seo-content:not([open]):hover,
.topic-seo-content:not([open]):has(> summary:focus-visible),
.quiz-answer-option:not(:disabled):is(:hover, :focus-visible) {
    border-color: var(--pastel-blue);
}

.phrase-card-content {
    min-width: 0;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    width: 100%;
}

.phrase-card-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin-top: 20px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
}

.phrase-card-footer .open-class-link {
    margin-top: 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-blue-dark);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-decoration: none;
    transition: color 0.15s ease, transform 0.15s ease;
}

.phrase-card:hover .phrase-card-footer .open-class-link,
.phrase-card-footer .open-class-link:hover,
.phrase-card-footer .open-class-link:focus,
.phrase-card-footer .open-class-link:focus-visible {
    color: var(--color-blue-hover);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.phrase-card:hover .phrase-card-footer .open-class-link span,
.phrase-card-footer .open-class-link:hover span {
    transform: translateX(3px);
}

.phrase-class-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--text-muted);
    background: transparent;
    border: none;
    padding: 0;
    margin-bottom: 14px;
    letter-spacing: 0.2px;
    cursor: default;
    pointer-events: none;
    user-select: none;
}

.phrase-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 14px;
}

.thai-text {
    min-width: 0;
    overflow-wrap: anywhere;
    font-family: var(--font-thai);
    font-size: 28px;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.35;
}

.phrase-top>.thai-text {
    flex: 1 1 180px;
}

.audio-buttons-group {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background-color: var(--bg-card-alt);
    padding: 3px 6px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.audio-buttons-group:not(:has(> .speak-btn:not([hidden]))) {
    display: none;
}

.speak-btn {
    background: transparent;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all 0.15s ease;
    flex-shrink: 0;
    cursor: pointer;
    opacity: 0.85;
}

.speak-btn:hover {
    background-color: var(--pastel-blue-light);
    opacity: 1;
}

.speak-btn:active {
    opacity: 0.7;
    transform: scale(0.95);
}

.phonetic-text {
    min-width: 0;
    overflow-wrap: anywhere;
    font-size: 17px;
    font-weight: 700;
    color: var(--color-pink-dark);
    margin-bottom: 8px;
}

.english-text {
    font-size: 18px;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 14px;
}

.vocabulary-topic-label {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    margin: 0 0 12px;
    padding: 5px 10px;
    border: 1px solid var(--pastel-sage-border);
    border-radius: var(--radius-full);
    background: var(--pastel-sage-light);
    color: var(--color-mint-dark);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.7px;
    line-height: 1;
    text-transform: uppercase;
}

.vocabulary-example {
    margin: 18px 0 4px;
    padding: 16px 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-card-alt);
}

.vocabulary-example-label {
    margin-bottom: 10px;
    color: var(--color-blue-dark);
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.6px;
    text-transform: uppercase;
}

.vocabulary-example .vocabulary-example-thai {
    margin-bottom: 6px;
    font-size: 23px;
    line-height: 1.4;
}

.vocabulary-example .vocabulary-example-phonetic {
    margin-bottom: 8px;
}

.vocabulary-example .phonetic-text {
    margin-bottom: 4px;
    font-size: 15px;
}

.vocabulary-example-english {
    color: var(--text-main);
    font-size: 15px;
    font-weight: 750;
    line-height: 1.45;
}

.word-by-word {
    font-size: 13.5px;
    color: var(--text-muted);
    background-color: var(--bg-card-alt);
    border: 1px dashed var(--border-color);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
    line-height: 1.45;
}

.wbw-label {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-blue-dark);
    margin-right: 4px;
}

.context-note {
    font-size: 13.5px;
    color: var(--text-muted);
    background-color: transparent;
    padding: 0;
    border: none;
    line-height: 1.55;
    margin-top: 12px;
}

.trivia-note {
    font-size: 13.5px;
    color: var(--text-main);
    background-color: var(--pastel-butter-light);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    border-left-width: 4px;
    line-height: 1.55;
    margin-top: 14px;
}

/*
   Small Topic Card Variant (For Articles & Embedded Callouts)
*/
.phrase-card.phrase-card-small {
    padding: 18px 20px;
    min-height: auto;
    border-radius: var(--radius-md);
    margin: 22px 0;
    max-width: 100%;
}

.phrase-card.phrase-card-small .phrase-class-tag {
    font-size: 11.5px;
    padding: 0;
    margin-bottom: 8px;
}

.phrase-card.phrase-card-small .thai-text {
    font-size: 22px;
    line-height: 1.3;
}

.phrase-card.phrase-card-small .audio-buttons-group {
    padding: 2px 5px;
    gap: 2px;
}

.phrase-card.phrase-card-small .speak-btn {
    width: 28px;
    height: 28px;
    font-size: 15px;
}

.phrase-card.phrase-card-small .phonetic-text {
    font-size: 14.5px;
    margin-bottom: 4px;
}

.phrase-card.phrase-card-small .english-text {
    font-size: 15.5px;
    margin-bottom: 10px;
}

.phrase-card.phrase-card-small .vocabulary-topic-label {
    margin-bottom: 8px;
    padding: 4px 8px;
    font-size: 10px;
}

.phrase-card.phrase-card-small .vocabulary-example {
    margin-top: 12px;
    padding: 12px 14px;
}

.phrase-card.phrase-card-small .vocabulary-example .vocabulary-example-thai {
    font-size: 19px;
}

.phrase-card.phrase-card-small .vocabulary-example .phonetic-text,
.phrase-card.phrase-card-small .vocabulary-example-english {
    font-size: 13px;
}

.phrase-card.phrase-card-small .word-by-word {
    font-size: 12px;
    padding: 6px 10px;
    margin-bottom: 10px;
}

.phrase-card.phrase-card-small .context-note {
    font-size: 12px;
    padding: 0;
    border: none;
    background: transparent;
    margin-top: 8px;
}

.phrase-card.phrase-card-small .trivia-note {
    font-size: 12px;
    padding: 8px 12px;
    border-left-width: 3px;
    margin-top: 10px;
}

.phrase-card.phrase-card-small .phrase-card-footer {
    margin-top: 14px;
    padding-top: 10px;
}

.phrase-card.phrase-card-small .phrase-card-footer .open-class-link {
    font-size: 13px;
}

/*
   Side-by-side grid for small topic cards inside articles
*/
.topic-card-grid-small {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: 16px;
    margin: 24px 0;
}

.topic-card-grid-small .phrase-card-small {
    margin: 0;
}

/*
   Preferences Card (Gender and Romanization Toggles)
*/
.preferences-card,
.gender-selector-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin: 28px 0 24px 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
    transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, padding 0.2s ease;
}

/*
   Preferences Card: Collapsible States & Toggle Bar
*/
.preferences-card.is-collapsed {
    padding: 0;
    cursor: pointer;
    background-color: #FFFFFF;
}

.preferences-card.is-collapsed:hover {
    background-color: #FAFCFE;
    box-shadow: 0 4px 14px rgba(56, 100, 137, 0.08);
}

.preferences-card.is-collapsed:focus-visible {
    outline: 2px solid var(--color-blue-dark);
    outline-offset: 2px;
}

.preferences-card.is-collapsed .preferences-collapsed-bar {
    display: flex;
}

.preferences-card.is-collapsed .preferences-expanded-body {
    display: none;
}

.preferences-card:not(.is-collapsed) .preferences-collapsed-bar {
    display: none;
}

.preferences-card:not(.is-collapsed) .preferences-expanded-body {
    display: block;
}

.preferences-collapsed-bar {
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    user-select: none;
}

.preferences-collapsed-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.preferences-collapsed-title {
    font-family: var(--font-heading);
    font-size: 14.5px;
    font-weight: 700;
    color: var(--text-main);
}

.preferences-summary-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.pref-tag {
    display: inline-flex;
    align-items: center;
    font-size: 12px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    line-height: 1.3;
    cursor: default;
    pointer-events: none;
    user-select: none;
}

.pref-tag-gender,
.pref-tag-romanization,
.pref-tag-font {
    background-color: var(--pastel-blue-light);
    color: var(--color-blue-dark);
    border: 1px solid var(--primary-pastel-border);
}

.preferences-collapsed-right {
    display: flex;
    align-items: center;
}

.preferences-edit-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-blue-dark);
    background-color: #FFFFFF;
    border: 1.5px solid var(--primary-pastel-border);
    border-radius: var(--radius-full);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: all 0.15s ease;
}

.preferences-card.is-collapsed:hover .preferences-edit-btn {
    background-color: var(--pastel-blue);
    border-color: var(--color-blue-dark);
    color: var(--color-blue-dark);
}

.preferences-toggle-icon {
    font-size: 10px;
    transition: transform 0.2s ease;
}

/*
   Save Preferences Action Row in Expanded View
*/
.preferences-save-row {
    display: flex;
    justify-content: flex-end;
    margin-top: 14px;
}

.btn-save-preferences {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 20px;
    background-color: var(--pastel-blue);
    border: 2px solid var(--color-blue-dark);
    border-radius: var(--radius-full);
    font-size: 13.5px;
    font-weight: 800;
    font-family: var(--font-heading);
    color: var(--color-blue-dark);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(56, 100, 137, 0.15);
    transition: all 0.15s ease;
    user-select: none;
}

.btn-save-preferences:hover {
    background-color: var(--color-blue-dark);
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(56, 100, 137, 0.25);
    transform: translateY(-1px);
}

.btn-save-preferences:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(56, 100, 137, 0.2);
}

.btn-save-preferences .save-icon {
    font-size: 14px;
    font-weight: 900;
}

.gender-card-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.gender-card-text {
    flex: 1 1 360px;
}

.preferences-card-header,
.gender-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 6px;
}

.preferences-card-icon,
.gender-card-icon {
    font-size: 18px;
}

.gender-card-text p {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

.gender-btn-group {
    display: flex;
    gap: 10px;
    align-items: center;
    width: 100%;
}

.gender-btn-group .gender-toggle-btn {
    flex: 1 1 0;
    min-width: 0;
    justify-content: center;
}

.preferences-controls-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-shrink: 0;
}

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

.preference-group-title {
    font-size: 11.5px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    color: var(--text-light);
}

.gender-toggle-btn,
.romanization-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background-color: #FFFFFF;
    border: 2px solid #CBD5E1;
    border-radius: var(--radius-full);
    font-size: 13.5px;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    user-select: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.gender-toggle-btn:hover,
.romanization-btn:hover {
    border-color: var(--color-blue-dark);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    background-color: #FAFCFE;
}

.gender-toggle-btn:active,
.romanization-btn:active {
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.gender-toggle-btn.active,
.romanization-btn.active {
    background-color: var(--pastel-blue-light);
    border-color: var(--color-blue-dark);
    color: var(--color-blue-dark);
    font-weight: 800;
    box-shadow: 0 2px 8px rgba(30, 58, 82, 0.12);
}

.toggle-indicator {
    display: inline-block;
    font-size: 13px;
    line-height: 1;
    color: #94A3B8;
    transition: color 0.15s ease;
}

.gender-toggle-btn.active .toggle-indicator {
    color: var(--color-blue-dark);
    font-weight: 900;
}

/*
   Checkbox Style for Multi-select toggles (e.g. Romanization)
*/
.toggle-indicator.toggle-indicator-checkbox,
.romanization-btn .toggle-indicator {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
    border: 1.5px solid #94A3B8;
    border-radius: 4px;
    background-color: #FFFFFF;
    position: relative;
    box-sizing: border-box;
    flex-shrink: 0;
    font-size: 0;
    line-height: 0;
    transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.gender-toggle-btn:hover .toggle-indicator.toggle-indicator-checkbox,
.romanization-btn:hover .toggle-indicator {
    border-color: var(--color-blue-dark);
}

.gender-toggle-btn.active .toggle-indicator.toggle-indicator-checkbox,
.romanization-btn.active .toggle-indicator {
    border-color: var(--color-blue-dark);
    background-color: var(--color-blue-dark);
    box-shadow: 0 1px 3px rgba(56, 100, 137, 0.25);
}

.toggle-indicator.toggle-indicator-checkbox::after,
.romanization-btn .toggle-indicator::after {
    content: '';
    display: none;
    width: 3.5px;
    height: 7px;
    border: solid #FFFFFF;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
    margin-top: -1.5px;
}

.gender-toggle-btn.active .toggle-indicator.toggle-indicator-checkbox::after,
.romanization-btn.active .toggle-indicator::after {
    display: block;
}

.gender-emoji {
    font-size: 16px;
}

/*
   Phonetic Container & Romanization Badges
*/
.phonetic-container {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 8px;
}

.phonetic-row {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.romanization-badge {
    display: inline-block;
    width: 64px;
    box-sizing: border-box;
    text-align: center;
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    background-color: var(--bg-card-alt);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    line-height: 1.2;
    flex-shrink: 0;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    user-select: none;
}

.romanization-badge:hover {
    background-color: var(--pastel-blue-light);
    color: var(--color-blue-dark);
    border-color: var(--pastel-blue-border);
    text-decoration: none;
}

@media (max-width: 600px) {
    .gender-card-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .gender-card-text {
        flex: 0 1 auto;
        min-width: 0;
    }

    .preferences-controls-column {
        width: 100%;
    }

    .gender-btn-group {
        width: 100%;
    }

    .gender-toggle-btn {
        flex: 1;
        justify-content: center;
    }
}

/*
   Thai Font Selector Card (Modern vs Classic Script Style)
*/
.font-selector-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 18px 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
    transition: border-color 0.2s ease;
}

.font-card-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}

.font-card-text {
    flex: 1 1 340px;
}

.font-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
}

.font-card-icon {
    font-size: 17px;
}

.font-card-text p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.45;
    margin: 0;
}

.font-btn-group {
    max-width: 100%;
    flex-wrap: wrap;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
}

.font-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background-color: #FFFFFF;
    border: 2px solid #CBD5E1;
    border-radius: var(--radius-full);
    font-size: 13.5px;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    user-select: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.font-toggle-btn:hover {
    border-color: var(--color-blue-dark);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    background-color: #FAFCFE;
}

.font-toggle-btn:active {
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.font-toggle-btn.active {
    background-color: var(--pastel-blue-light);
    border-color: var(--color-blue-dark);
    color: var(--color-blue-dark);
    font-weight: 800;
    box-shadow: 0 2px 8px rgba(30, 58, 82, 0.12);
}

.font-toggle-btn .toggle-indicator {
    color: #94A3B8;
}

.font-toggle-btn.active .toggle-indicator {
    color: var(--color-blue-dark);
    font-weight: 900;
}

.font-preview {
    font-size: 15px;
    letter-spacing: 0.2px;
}

@media (max-width: 600px) {
    .font-card-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .font-card-text {
        /*
           A desktop width basis becomes a 340px height in a flex column.
        */
        flex: 0 1 auto;
        min-width: 0;
    }

    .font-btn-group {
        width: 100%;
    }

    .font-toggle-btn {
        flex: 1 1 130px;
        min-width: 0;
        justify-content: center;
    }
}

/*
   Site-wide Thai Font Overrides (Only alters Thai-script text)
*/
body.thai-font-classic .thai-text,
body.thai-font-classic .particle-thai,
body.thai-font-classic [lang="th"],
body.thai-font-classic .thai-script,
.font-classic {
    font-family: var(--font-thai-classic) !important;
}

body.thai-font-modern .thai-text,
body.thai-font-modern .particle-thai,
body.thai-font-modern [lang="th"],
body.thai-font-modern .thai-script,
.font-modern {
    font-family: var(--font-thai-modern) !important;
}

/*
   Focused Class Topic Reader View
*/
.class-view-section {
    padding: 24px 0 72px;
}

.class-topic-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 38px 36px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
    transition: border-color 0.15s ease;
}

.class-topic-card.topic-swipe-enabled {
    touch-action: pan-y pinch-zoom;
}

.topic-swipe-tip {
    margin: 20px 0 0;
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.5;
}

.class-nav-bar button:disabled {
    cursor: not-allowed;
}

.btn-test-yourself {
    background-color: var(--pastel-sage-light);
    color: var(--color-mint-dark);
    border: 2px solid var(--pastel-sage-border);
}

.btn-test-yourself:hover {
    background-color: var(--pastel-mint);
    color: var(--text-main);
}

/*
   Lesson Quiz
*/
.quiz-panel {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-top: 32px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.quiz-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 16px;
}

.quiz-eyebrow {
    display: block;
    color: var(--color-mint-dark);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: 0.7px;
    text-transform: uppercase;
    margin-bottom: 3px;
}

.quiz-title {
    color: var(--text-main);
    font-family: var(--font-heading);
    font-size: 26px;
    line-height: 1.25;
    margin: 0;
}

.quiz-counter {
    flex-shrink: 0;
    background-color: var(--pastel-sage-light);
    border: 1px solid var(--pastel-sage-border);
    border-radius: var(--radius-full);
    color: var(--color-mint-dark);
    font-size: 14px;
    font-weight: 800;
    padding: 7px 13px;
}

.quiz-mode-controls {
    margin-bottom: 20px;
}

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

.quiz-mode-button {
    min-height: 44px;
    padding: 9px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    background-color: var(--bg-card);
    color: var(--text-main);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

.quiz-mode-button[aria-pressed="true"] {
    background-color: var(--pastel-sage-light);
    border-color: var(--color-mint-dark);
    color: var(--color-mint-dark);
}

.quiz-mode-button:focus-visible,
.quiz-reveal-button:focus-visible {
    outline: 3px solid var(--color-blue-dark);
    outline-offset: 3px;
}

.quiz-mode-help {
    margin: 10px 0 16px;
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.5;
}

.quiz-progress {
    width: 100%;
    height: 8px;
    overflow: hidden;
    background-color: var(--bg-card-alt);
    border-radius: var(--radius-full);
    margin-bottom: 24px;
}

.quiz-progress-fill {
    display: block;
    width: 0;
    height: 100%;
    background-color: var(--color-mint-dark);
    border-radius: inherit;
    transition: width 0.2s ease;
}

.quiz-question-card {
    background-color: var(--pastel-blue-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    margin-bottom: 20px;
}

.quiz-phrase-top {
    align-items: center;
    margin-bottom: 18px;
}

.quiz-thai-text {
    font-size: 34px;
    line-height: 1.4;
    margin-bottom: 10px;
}

.quiz-reveal-button {
    min-height: 36px;
    padding: 6px 12px;
    border: 1px solid var(--pastel-blue-border);
    border-radius: var(--radius-full);
    background-color: var(--bg-card);
    color: var(--color-blue-dark);
    font: inherit;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
}

.quiz-reveal-button:hover {
    background-color: var(--bg-card-alt);
}

.quiz-question-card.is-listening .quiz-phrase-top {
    flex-direction: column;
    gap: 24px;
    margin-bottom: 0;
    text-align: center;
}

.quiz-question-card.is-listening .speak-btn {
    width: 64px;
    height: 64px;
    font-size: 28px;
}

.quiz-phonetic-container {
    margin-bottom: 0;
}

.quiz-phonetic-container .phonetic-text {
    font-size: 19px;
    margin-bottom: 0;
}

.quiz-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.quiz-answer-option {
    display: flex;
    align-items: center;
    gap: 13px;
    min-height: 64px;
    width: 100%;
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-main);
    cursor: pointer;
    font-family: var(--font-main);
    font-size: 16px;
    font-weight: 800;
    line-height: 1.35;
    padding: 12px 16px;
    text-align: left;
    transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.quiz-answer-option:hover:not(:disabled) {
    background-color: var(--pastel-blue-light);
    transform: translateY(-1px);
}

.quiz-answer-option:focus-visible,
.btn-test-yourself:focus-visible {
    outline: 3px solid rgba(56, 100, 137, 0.3);
    outline-offset: 3px;
}

.quiz-answer-option:disabled {
    cursor: default;
    opacity: 1;
}

.quiz-option-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    background-color: var(--bg-card-alt);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 900;
}

.quiz-answer-option.is-correct {
    background-color: #e8f6f0;
    color: #245747;
}

.quiz-answer-option.is-correct .quiz-option-number {
    background-color: #3a806b;
    border-color: #3a806b;
    color: #ffffff;
}

.quiz-answer-option.is-wrong {
    background-color: #fff0f2;
    color: #8f3040;
}

.quiz-answer-option.is-wrong .quiz-option-number {
    background-color: #bd4d5c;
    border-color: #bd4d5c;
    color: #ffffff;
}

.quiz-feedback {
    min-height: 24px;
    font-size: 15px;
    font-weight: 800;
    margin: 16px 0 0;
    text-align: center;
}

.quiz-feedback.is-correct {
    color: #2d6b57;
}

.quiz-feedback.is-wrong {
    color: #a13848;
}

.quiz-feedback.is-folded {
    color: var(--text-muted);
}

.quiz-actions {
    display: flex;
    justify-content: center;
    margin-top: 14px;
}

.quiz-results {
    padding: 30px 12px 12px;
    text-align: center;
}

.quiz-score-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 68px;
    height: 68px;
    background-color: var(--pastel-mint);
    border: 2px solid var(--color-mint-dark);
    border-radius: 50%;
    color: var(--color-mint-dark);
    font-size: 34px;
    font-weight: 900;
    margin-bottom: 16px;
}

.quiz-results h3 {
    font-family: var(--font-heading);
    font-size: 27px;
    margin-bottom: 8px;
}

.quiz-score {
    color: var(--color-mint-dark);
    font-size: 22px;
    font-weight: 900;
    margin-bottom: 8px;
}

.quiz-results-note {
    color: var(--text-muted);
    font-size: 16px;
    margin: 0 auto 22px;
    max-width: 520px;
}

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

@media (max-width: 600px) {
    .class-topic-card {
        padding: 26px 20px;
    }

    .class-nav-bar {
        width: 100%;
    }

    .class-nav-bar .btn {
        flex: 1 1 120px;
    }

    .quiz-panel {
        padding: 22px 18px;
    }

    .quiz-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
    }

    .quiz-question-card {
        padding: 22px 18px;
    }

    .quiz-thai-text {
        font-size: 30px;
    }

    .quiz-options {
        grid-template-columns: 1fr;
    }

    .quiz-answer-option {
        min-height: 58px;
    }

    .quiz-result-actions .btn {
        width: 100%;
    }
}

/*
   Class Summary & Learning Goals Cards
*/
.class-summary-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 26px 30px;
    margin-bottom: 24px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
}

.class-summary-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    background-color: var(--bg-card);
}

.class-summary-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    color: var(--text-muted);
    font-size: 12.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    padding: 0;
    border: none;
    cursor: default;
    pointer-events: none;
    user-select: none;
}

.class-summary-title {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 700;
    color: var(--color-blue-dark);
    margin: 0;
}

.class-summary-text {
    font-size: 15px;
    line-height: 1.65;
    color: var(--text-main);
    margin: 0;
}

.class-goals-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    margin-top: 36px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02);
    transition: all 0.2s ease;
}

.class-goals-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
}

.class-goals-title-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.class-goals-card > summary::-webkit-details-marker,
.topic-seo-content > summary::-webkit-details-marker {
    display: none;
}

@media (min-width: 769px) {
    .topic-seo-header {
        display: none;
    }

    .class-goals-card > summary {
        pointer-events: none;
        cursor: default;
        list-style: none;
    }
}

.class-goals-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    color: var(--color-mint-dark);
    font-size: 12.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    padding: 0;
    border: none;
    cursor: default;
    pointer-events: none;
    user-select: none;
}

.class-goals-title {
    font-family: var(--font-heading);
    font-size: 19px;
    font-weight: 700;
    color: var(--color-mint-dark);
    margin: 0;
}

.class-goals-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0 0 16px 0;
}

.class-goals-list {
    list-style: none;
    padding: 0;
    margin: 4px 0 0 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.class-goal-item {
    display: flex;
    align-items: baseline;
    gap: 10px;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-main);
}

.goal-bullet {
    display: inline-block;
    color: var(--color-mint-dark);
    font-size: 18px;
    line-height: 1;
    flex-shrink: 0;
    user-select: none;
}

.goal-check-icon {
    display: inline-block;
    color: var(--color-mint-dark);
    font-size: 16px;
    line-height: 1;
    flex-shrink: 0;
}

.class-goals-completion-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    color: var(--color-butter-dark);
    font-size: 12.5px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    padding: 0;
    border: none;
    cursor: default;
    pointer-events: none;
    user-select: none;
}

@media (max-width: 600px) {
    .class-goal-item {
        font-size: 14.5px;
        gap: 8px;
    }
}

/*
   Practical Tips for New Teachers (Pastel Cards)
*/
.tips-section {
    padding: 24px 0 56px 0;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
    gap: 24px;
}

.tip-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s ease;
}

.tip-card h3 {
    font-family: var(--font-heading);
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-main);
    transition: color 0.15s ease;
}

.tip-card:hover h3 {
    color: var(--color-blue-dark);
}

.tip-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    flex-grow: 1;
}

.card-link-text {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 18px;
    font-size: 14px;
    font-weight: 700;
    color: var(--color-blue-dark);
    text-decoration: none;
    transition: color 0.15s ease;
}

.card-link-text:hover,
.card-link-text:focus,
.card-link-text:focus-visible {
    color: var(--color-blue-hover);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.tip-card:hover,
.tip-card:focus {
    text-decoration: none;
}

.tip-card:hover .card-link-text,
.tip-card:focus .card-link-text,
.tip-card:focus-visible .card-link-text,
.card-clickable:hover .card-link-text,
.card-clickable:focus .card-link-text,
.card-clickable:focus-visible .card-link-text,
a:hover .card-link-text,
a:focus .card-link-text,
a:focus-visible .card-link-text {
    color: var(--color-blue-hover);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.tip-card .card-link-text span,
.card-link-text span {
    display: inline-block;
    transition: transform 0.15s ease;
    text-decoration: none;
}

.tip-card:hover .card-link-text span,
.tip-card:focus .card-link-text span,
.card-link-text:hover span {
    transform: translateX(3px);
    text-decoration: none;
}

/*
   Modern Footer
*/
footer {
    background-color: var(--bg-card);
    border-top: 2px solid var(--border-color);
    padding: 56px 0 28px 0;
    margin-top: 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.3fr 0.9fr 1.1fr;
    gap: 36px;
    align-items: start;
    margin-bottom: 40px;
}

.footer-brand-col {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer {
    font-size: 15px;
    color: var(--text-muted);
    max-width: 440px;
    line-height: 1.6;
}

.footer-disclaimer {
    font-size: 13px;
    color: var(--text-muted);
    max-width: 440px;
    line-height: 1.55;
}

.footer-disclaimer a {
    color: var(--color-blue);
    text-decoration: underline;
    text-underline-offset: 2px;
    font-weight: 600;
    transition: color 0.15s ease;
}

.footer-disclaimer a:hover {
    color: var(--color-blue-dark);
}


.footer-nav-col h4 {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 14px;
    letter-spacing: 0.3px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    transition: color 0.15s;
    display: inline-block;
}

.footer-links a:hover {
    color: var(--color-blue-dark);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-light);
}

.footer-bottom a {
    color: var(--text-muted);
    font-weight: 600;
    transition: color 0.15s;
}

.footer-bottom a:hover {
    color: var(--color-blue-dark);
}

/*
   About Page Specific Styling (Cute, Minimal, Pastel)
*/
.about-hero {
    padding: 56px 0 36px 0;
    text-align: center;
}

.about-content {
    padding-bottom: 64px;
}

.about-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
    margin-bottom: 28px;
}

.about-card h2 {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.about-card p {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 14px;
}

.about-card p:last-child {
    margin-bottom: 0;
}

.about-creator-content {
    display: flex;
    align-items: flex-start;
    gap: 28px;
    margin-top: 18px;
}

.about-creator-photo-wrap {
    flex-shrink: 0;
    width: 200px;
}

.about-creator-photo {
    width: 100%;
    height: auto;
    aspect-ratio: 410 / 614;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(44, 56, 66, 0.06);
    display: block;
}

.about-creator-caption {
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--text-muted);
    text-align: center;
    margin-top: 10px;
}

.about-creator-caption [lang="th"] {
    font-weight: 600;
    color: var(--text-main);
}

.about-creator-text {
    flex: 1;
    min-width: 0;
}

.about-creator-text p:last-child {
    margin-bottom: 0;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
    gap: 20px;
    margin-top: 20px;
}

.about-subcard {
    background-color: var(--bg-page);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 22px;
}

.about-subcard h3 {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

/*
   Article & Long-form Content Styling (Cute, Minimal, Pastel)
*/
.article-header {
    position: static;
    background: transparent;
    border: none;
    text-align: center;
    padding: 56px 0 36px 0;
}

.article-reader {
    padding-top: 24px;
}

.article-reader .article-header {
    padding-top: 0;
}

.class-header {
    position: static;
    background: transparent;
    border: none;
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 14px;
    font-weight: 600;
}

.article-body {
    overflow-wrap: anywhere;
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 44px 40px;
    margin-bottom: 36px;
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-main);
}

.article-body h2 {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    margin: 36px 0 16px 0;
    padding-bottom: 8px;
    border-bottom: 1.5px solid var(--border-color);
}

.article-body h2:first-of-type {
    margin-top: 0;
}

.article-body h3 {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    margin: 28px 0 12px 0;
}

.article-body p {
    margin-bottom: 20px;
    color: var(--text-main);
}

.article-body .article-inline-link {
    color: var(--color-blue-dark);
    font-weight: 700;
    text-decoration: underline;
    text-decoration-thickness: 1.5px;
    text-underline-offset: 3px;
}

.article-body .article-inline-link:hover,
.article-body .article-inline-link:focus {
    color: var(--color-blue-hover);
}

.article-body ul,
.article-body ol {
    margin: 0 0 24px 24px;
    color: var(--text-main);
}

.article-body li {
    margin-bottom: 10px;
    line-height: 1.7;
}

.article-callout {
    background-color: var(--bg-page);
    border: 1px solid var(--border-color);
    border-left-width: 4px;
    border-radius: var(--radius-sm);
    padding: 20px 24px;
    margin: 28px 0;
    font-size: 16px;
}

.article-callout.sage {
    background-color: var(--pastel-sage-light);
}

.article-callout.butter {
    background-color: var(--pastel-butter-light);
}

.article-callout.orange {
    background-color: var(--pastel-peach-light);
}

.article-callout p:last-child {
    margin-bottom: 0;
}

/*
   Article Figures & Illustrations
*/
.article-figure {
    margin: 28px 0;
    text-align: center;
}

.article-figure.float-right {
    float: right;
    width: 230px;
    margin: 4px 0 20px 28px;
    text-align: center;
}

.article-figure img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(44, 56, 66, 0.06);
    display: block;
    margin: 0 auto;
}

.article-figure figcaption {
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--text-muted);
    margin-top: 10px;
    text-align: center;
}

.article-body h2,
.article-body h3,
.article-callout {
    clear: both;
}

.card-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    padding: 8px 16px;
    background-color: var(--bg-page);
    color: var(--color-blue-dark);
    border: 1.5px solid var(--pastel-blue);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 800;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.card-link-btn:hover {
    background-color: var(--pastel-blue);
    border-color: var(--primary-pastel-border);
    color: var(--text-main);
}

/*
   Breadcrumb navigation
*/
.breadcrumbs {
    margin-bottom: 28px;
    padding: 6px 10px;
    background-color: var(--pastel-lavender-light);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.5;
    text-align: left;
}

.breadcrumbs ol {
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 2px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.breadcrumbs li {
    display: flex;
    align-items: flex-start;
    gap: 2px;
    min-width: 0;
    max-width: 100%;
}

.breadcrumbs li+li::before {
    content: '';
    flex: 0 0 6px;
    width: 6px;
    height: 6px;
    margin: 15px 6px 0 2px;
    border-top: 1.5px solid var(--color-lavender-dark);
    border-right: 1.5px solid var(--color-lavender-dark);
    transform: rotate(45deg);
    opacity: 0.55;
}

.breadcrumbs a,
.breadcrumbs [aria-current="page"] {
    display: block;
    min-width: 0;
    min-height: 36px;
    padding: 7px 8px;
    border-radius: var(--radius-sm);
    overflow-wrap: anywhere;
}

.breadcrumbs a {
    color: var(--color-lavender-dark);
    text-decoration: none;
}

.breadcrumbs a:hover {
    background-color: var(--pastel-lavender);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.breadcrumbs a:focus-visible {
    background-color: var(--pastel-lavender);
    outline: 2px solid var(--color-lavender-dark);
    outline-offset: 2px;
}

.breadcrumbs [aria-current="page"] {
    color: var(--text-main);
    font-weight: 600;
}

/*
   Search-ready lesson hubs and topic guides
*/

.lesson-hub-header {
    max-width: 760px;
    margin: 0 auto 34px;
    text-align: center;
}

.lesson-hub-icon {
    margin-bottom: 10px;
    font-size: 40px;
    line-height: 1;
}

.lesson-hub-intro {
    margin: 14px auto 0;
    color: var(--text-muted);
    font-size: 17px;
    line-height: 1.7;
}

.lesson-hub-intro p {
    margin: 0 0 10px;
}

.lesson-hub-goals {
    margin: 0 0 44px;
}

.lesson-hub-topics {
    margin-top: 44px;
}

.lesson-hub-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
}

.lesson-hub-grid .phrase-card.phrase-card-small {
    height: 100%;
    margin: 0;
}

.topic-seo-content {
    margin-top: 40px;
}

/*
   Responsive Media Queries
*/
@media (max-width: 1024px) and (min-width: 881px) {
    .nav-links {
        gap: 8px;
    }

    .nav-links a {
        padding: 6px 10px;
        font-size: 14px;
    }
}

@media (max-width: 880px) {
    .nav-links {
        display: none !important;
    }

    .nav-hamburger-btn {
        display: flex;
    }

    .mobile-nav-menu {
        display: block;
    }
}

@media (max-width: 768px) {

    .lesson-hub-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 30px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .about-card {
        padding: 24px 20px;
    }

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

    .about-creator-photo-wrap {
        width: 170px;
        max-width: 60%;
    }

    .about-creator-text {
        width: 100%;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .preferences-collapsed-bar {
        gap: 12px;
    }

    .preferences-collapsed-right {
        width: 100%;
        justify-content: flex-end;
    }

    .preferences-save-row {
        justify-content: stretch;
    }

    .btn-save-preferences {
        width: 100%;
    }
}

@media (max-width: 480px) {

    .class-view-section,
    .article-reader {
        padding-top: 16px;
    }

    .breadcrumbs {
        margin-bottom: 24px;
        padding: 4px 6px;
        font-size: 13px;
    }

    .brand-title {
        font-size: 18px;
    }

    .brand-logo {
        height: 38px;
    }

    .container {
        padding: 0 16px;
    }
}

@media (max-width: 600px) {
    .article-body {
        padding: 24px 18px;
        font-size: 16px;
    }

    .article-callout {
        padding: 16px;
    }

    .article-figure.float-right {
        float: none;
        width: 100%;
        max-width: 240px;
        margin: 20px auto;
    }

    .particle-guide {
        padding: 22px 18px;
    }

    .phrase-card {
        padding: 24px 18px;
    }

    .preferences-card,
    .font-selector-card {
        padding: 18px;
    }
}

/*
   Touch controls need room even when a phone is held in landscape.
*/
@media (pointer: coarse) {

    .speak-btn,
    .phrase-card.phrase-card-small .speak-btn {
        min-width: 44px;
        min-height: 44px;
    }

    .romanization-badge,
    .footer-links a,
    .open-class-link {
        min-height: 44px;
        align-content: center;
    }

    .footer-links a {
        display: inline-block;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .mobile-nav-menu,
    .hamburger-bar {
        transition: none;
    }
}

/*
   Speed labels remain visible on touch devices, where hover titles are absent.
*/
.speak-btn,
.phrase-card.phrase-card-small .speak-btn {
    flex-direction: column;
    gap: 3px;
    width: auto;
    min-width: 56px;
    height: auto;
    min-height: 52px;
    padding: 7px 10px;
    line-height: 1;
}

.speak-btn>svg {
    flex-shrink: 0;
}

.speak-btn::after {
    content: none;
    font: 700 10px/1.2 var(--font-main);
    color: var(--text-main);
    white-space: nowrap;
    flex-shrink: 0;
}

.audio-buttons-group:has(> .speak-btn-slow:not([hidden]))>.speak-btn:not(.speak-btn-slow)::after {
    content: 'Normal';
}

.speak-btn-slow::after {
    content: 'Slow';
}

.speak-btn.is-playing,
.article-audio-btn.is-playing {
    background-color: var(--pastel-blue);
    opacity: 1;
}

.speak-btn[aria-busy='true'],
.article-audio-btn[aria-busy='true'] {
    opacity: 0.6;
}

.article-table-scroll {
    overflow-x: auto;
    overscroll-behavior-x: contain;
    margin: 24px 0;
}

.article-table-scroll table {
    min-width: 560px;
    overflow-wrap: normal;
}

.table-scroll-hint {
    display: none;
}

@media (max-width: 600px) {
    .article-body .table-scroll-hint {
        display: block;
        margin-bottom: -12px;
        font-size: 13px;
        color: var(--text-muted);
    }
}

/*
   Mobile lesson review: keep learning content and navigation within reach.
*/
.class-header {
    text-align: center;
    margin-bottom: 32px;
}

.class-header .hero-title {
    font-size: 34px;
    margin-bottom: 10px;
}

#display-thai {
    font-size: 34px;
    line-height: 1.4;
    margin-bottom: 8px;
}

.class-summary-card {
    padding: 0;
}

.class-summary-card>summary {
    min-height: 48px;
    margin: 0;
    padding: 14px 20px;
    border-radius: calc(var(--radius-lg) - 2px);
    background-color: transparent;
    cursor: pointer;
    list-style: none;
    justify-content: space-between;
}

.class-summary-card>summary::-webkit-details-marker {
    display: none;
}

.class-summary-card>summary::after {
    content: '+';
    font-size: 20px;
    line-height: 1;
    color: var(--color-blue-dark);
}

.class-summary-card[open]>summary::after {
    content: '−';
}

.class-summary-card .class-summary-text {
    padding: 0 20px 20px;
}

.class-summary-card>summary:focus-visible,
.class-goals-card>summary:focus-visible,
.topic-seo-content>summary:focus-visible,
.preferences-collapsed-bar:focus-visible,
.class-nav-bar a:focus-visible,
#topic-select:focus-visible {
    outline: 3px solid var(--color-blue-dark);
    outline-offset: 3px;
}

.preferences-collapsed-bar {
    width: 100%;
    color: inherit;
    font: inherit;
    text-align: left;
    padding: 14px 20px;
    border-radius: calc(var(--radius-lg) - 2px);
    min-height: 44px;
}

.class-topic-picker {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.class-topic-picker label {
    flex-shrink: 0;
    font-size: 14px;
    font-weight: 800;
    color: var(--color-blue-dark);
}

#topic-select {
    flex: 1;
    min-width: 0;
    width: 100%;
    min-height: 48px;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    color: var(--text-main);
    font: 700 16px/1.4 var(--font-main);
    text-overflow: ellipsis;
}

.class-nav-bar {
    display: flex;
    gap: 14px;
    justify-content: center;
    align-items: center;
    margin-top: 32px;
    flex-wrap: wrap;
}

#active-topic-card:focus,
#quiz-question-view:focus {
    outline: none;
}

@media (max-width: 768px) {
    body:has(#active-topic-card:not([hidden]))>footer {
        display: none;
    }

    .class-header {
        margin-bottom: 18px;
    }

    .class-header .hero-title {
        font-size: clamp(24px, 6.5vw, 30px);
        line-height: 1.25;
    }

    .class-view-section .breadcrumbs {
        margin-bottom: 16px;
    }

    .class-view-section .preferences-card {
        margin: 18px 0 16px;
    }

    .preferences-card.is-collapsed .preferences-collapsed-bar {
        padding: 12px 16px;
    }

    .preferences-collapsed-bar {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        gap: 8px;
    }

    .preferences-card.is-collapsed .preferences-collapsed-bar {
        display: grid;
    }

    .preferences-collapsed-left {
        display: contents;
    }

    .preferences-collapsed-title {
        grid-area: 1 / 1;
    }

    .preferences-collapsed-right {
        grid-area: 1 / 2;
        width: auto;
    }

    .preferences-summary-tags {
        grid-area: 2 / 1 / auto / 3;
        gap: 6px;
    }

    .class-summary-card,
    .class-goals-card,
    .article-body.topic-seo-content {
        margin-bottom: 16px;
        padding: 0;
    }

    .class-goals-card {
        margin-top: 16px;
    }

    .topic-seo-content {
        margin-top: 16px;
    }

    .class-goals-card > summary,
    .topic-seo-content > summary {
        min-height: 48px;
        margin: 0;
        padding: 14px 20px;
        border-radius: calc(var(--radius-lg) - 2px);
        background-color: transparent;
        cursor: pointer;
        list-style: none;
        display: flex;
        align-items: center;
        justify-content: space-between;
        user-select: none;
    }

    .class-goals-card > summary::after,
    .topic-seo-content > summary::after {
        content: '+';
        font-size: 20px;
        line-height: 1;
        color: var(--color-blue-dark);
        margin-left: auto;
    }

    .class-goals-card[open] > summary::after,
    .topic-seo-content[open] > summary::after {
        content: '−';
    }

    .class-goals-card .class-goals-body {
        padding: 0 20px 20px;
    }

    .class-goals-card .class-goals-subtitle {
        margin: 0 0 12px 0;
    }

    .topic-seo-content .topic-seo-body {
        padding: 0 20px 20px;
        font-size: 16px;
        line-height: 1.7;
    }

    .topic-seo-content .topic-seo-body h2 {
        font-size: 20px;
        margin: 20px 0 12px 0;
        padding-bottom: 6px;
    }

    .topic-seo-content .topic-seo-body h2:first-of-type {
        margin-top: 4px;
    }

    .topic-seo-content .topic-seo-body p {
        margin-bottom: 16px;
    }

    .topic-seo-content .topic-seo-body ul,
    .topic-seo-content .topic-seo-body ol {
        margin: 0 0 16px 20px;
    }

    .class-topic-picker {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .class-topic-card {
        padding: 22px 18px;
    }

    #display-thai {
        font-size: clamp(28px, 8vw, 34px);
    }

    .quiz-panel {
        padding: 18px 12px;
    }

    .quiz-question-card {
        padding: 18px 14px;
    }

    .quiz-answer-option {
        padding: 12px;
        gap: 10px;
        overflow-wrap: anywhere;
    }

    .quiz-actions .btn {
        width: 100%;
        min-height: 48px;
    }
}

@media (max-width: 600px) {
    .preferences-controls-column {
        order: -1;
    }
}

/*
   Leave short landscape screens free of a second fixed bar.
*/
@media (max-width: 768px) and (min-height: 480px) {
    html:has(.class-nav-bar:not([hidden])) {
        scroll-padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
    }

    body:has(.class-nav-bar:not([hidden])) {
        padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
    }

    .class-nav-bar {
        position: fixed;
        z-index: 40;
        bottom: 0;
        left: 0;
        right: 0;
        margin: 0 auto;
        max-width: 820px;
        width: 100%;
        flex-wrap: nowrap;
        gap: 8px;
        padding: 10px max(12px, env(safe-area-inset-right, 0px)) max(10px, env(safe-area-inset-bottom, 0px)) max(12px, env(safe-area-inset-left, 0px));
        border-top: 2px solid var(--border-color);
        background-color: var(--bg-card);
        box-shadow: 0 -4px 16px rgba(44, 56, 66, 0.08);
    }

    .class-nav-bar .btn {
        flex: 1 1 0;
        min-width: 0;
        min-height: 48px;
        padding: 10px 8px;
        font-size: 14px;
        gap: 6px;
    }

    .class-nav-bar #btn-beginning {
        flex: 0 0 44px;
    }

    .class-nav-beginning-label {
        display: none;
    }

    .class-nav-bar .btn-primary {
        background-color: var(--pastel-blue-light);
    }
}

@media (pointer: coarse) {

    .breadcrumbs a,
    .breadcrumbs [aria-current='page'] {
        min-height: 44px;
        padding-top: 11px;
        padding-bottom: 11px;
    }

    .breadcrumbs li+li::before {
        margin-top: 19px;
    }
}


@media (max-width: 768px) {
    .class-view-section .pref-tag {
        padding: 2px 5px;
        font-size: 11px;
    }

    /*
       The native picker names the topic; keep its label available to screen readers.
    */
    .class-topic-picker label {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        overflow: hidden;
        clip-path: inset(50%);
        white-space: nowrap;
    }
}

/*
   Consolidated Article Audio & Extracted Component Styles
*/

/*
   Compact inline players also work inside article headings and reference tables.
*/
.article-audio-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-width: 28px;
    min-height: 28px;
    margin: 0 2px;
    padding: 2px 4px;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--color-blue-dark);
    font: normal 15px/1.2 var(--font-body, sans-serif);
    vertical-align: middle;
    cursor: pointer;
}

.article-audio-btn:hover {
    background: var(--pastel-blue-light);
}

.article-audio-btn:focus-visible {
    outline: 2px solid var(--color-blue-dark);
    outline-offset: 2px;
}

.article-audio-variant {
    font-size: 11px;
    font-weight: 700;
}

.article-body .article-audio-help {
    margin: 0 0 28px;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--pastel-blue-light);
    font-size: 13px;
    color: var(--text-muted);
}

@media print {

    .article-audio-btn,
    .article-audio-help {
        display: none;
    }
}

.article-vocabulary-tail {
    white-space: nowrap;
}

.article-vocabulary-mention {
    font-style: normal;
}

.article-vocabulary-thai {
    font-family: var(--font-thai);
}

.article-vocabulary-rtgs {
    font-family: var(--font-body, sans-serif);
    font-style: normal;
}

.phrase-card[data-editorial-example] .phonetic-rtgs {
    flex-wrap: wrap;
    align-items: center;
}

.phrase-card[data-editorial-example] .audio-buttons-group {
    flex: 0 0 auto;
    margin-left: 4px;
}

.article-meta {
    flex-wrap: wrap;
}

@media (pointer: coarse) {
    .article-audio-btn {
        min-width: 44px;
        min-height: 44px;
    }
}

/*
   Article Tables & Pronunciation Guides
*/
.table-scroll-hint {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.article-table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 24px;
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    font-size: 14px;
}

.article-table thead tr {
    background: var(--pastel-blue-light);
    text-align: left;
}

.article-table th {
    padding: 12px 16px;
    border-bottom: 2px solid var(--border-color);
    font-weight: 700;
}

.article-table tbody tr {
    border-bottom: 1px solid var(--border-color);
}

.article-table tbody tr:last-child {
    border-bottom: 0;
}

.article-table td {
    padding: 12px 16px;
}

.article-table td.col-thai {
    font-weight: 700;
    font-size: 18px;
    font-family: var(--font-thai);
}

.article-table td.col-tone {
    font-weight: 700;
}

.article-table td.col-example {
    font-family: var(--font-thai);
    font-weight: 600;
}

/*
   Highlight Phrases & Callouts
*/
.phrase-highlight {
    text-align: center;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin: 20px 0;
}

.phrase-highlight-lg {
    font-size: 19px;
    margin: 16px 0;
}

/*
   Container Modifiers
*/
.container-reading {
    max-width: 860px;
}

.container-about {
    max-width: 900px;
}

.container-class {
    max-width: 820px;
}

.container-not-found {
    max-width: 680px;
    padding: 80px 24px;
    text-align: center;
}

/*
   Error / Not Found Page Styles
*/
.not-found-title {
    font-family: var(--font-heading);
    font-size: 32px;
    margin-bottom: 16px;
}

.not-found-desc {
    color: var(--text-muted);
    margin-bottom: 28px;
}

/*
   Shared Icons & UI Utilities
*/
.external-link-icon {
    margin: 0 2px;
    padding: 0;
    position: relative;
    top: 2px;
    vertical-align: baseline;
}

/*
   Footer Brand Elements
*/
.footer-brand-logo {
    height: 42px;
}

.footer-brand-title {
    font-family: var(--font-heading);
    font-size: 18px;
    color: var(--text-main);
}

.footer-brand-domain {
    font-size: 13px;
    color: var(--text-muted);
}

/*
   Legal Page Components
*/
.legal-link {
    color: var(--color-blue-dark);
    font-weight: 700;
    text-decoration: underline;
}

.legal-cookie-list {
    margin: 10px 0 14px 24px;
    color: var(--text-muted);
    font-size: 14.5px;
    line-height: 1.6;
}

.legal-cookie-note {
    font-size: 14px;
    color: var(--text-muted);
}

/*
   Article Reader Components
*/
.article-hero-title {
    font-size: 34px;
}

.article-bottom-nav {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

/*
   About & Introduction Pages
*/
.about-cta-wrapper {
    text-align: center;
    margin-top: 40px;
}

.btn-cta {
    font-size: 16px;
    padding: 13px 30px;
}

.about-grid-mb {
    margin-bottom: 28px;
}

.intro-callout-heading {
    margin-top: 0;
    font-size: 19px;
    color: var(--text-main);
}

.list-mb-0 {
    margin-bottom: 0;
}

.topic-card-spaced {
    margin: 24px 0;
}

/*
   Class Reader Specific Overrides
*/
.class-header-desc {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

.topic-counter {
    margin-top: 14px;
    font-weight: 800;
    font-size: 14px;
    color: var(--color-blue-dark);
}

.phrase-top-spaced {
    margin-bottom: 18px;
}

.phrase-class-tag-no-mb {
    margin-bottom: 0;
}

.class-topic-card .phonetic-text {
    font-size: 19px;
}

.class-topic-card .english-text {
    font-size: 22px;
    margin-bottom: 18px;
}

.phonetic-container-mb {
    margin-bottom: 12px;
}

/*
   Learning Preferences Panel
*/

.preference-group-spaced {
    margin-top: 10px;
}

.preferences-save-row {
    margin-top: 14px;
}

.font-preview-modern {
    font-family: var(--font-thai-modern);
    font-weight: 600;
}

.font-preview-classic {
    font-family: var(--font-thai-classic);
    font-weight: 600;
}