/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&family=Urbanist:wght@300;400;500;600;700;800&display=swap');

/* --- Color Palette Variables --- */
:root {
    /* Primary Colors */
    --primary-100: #D95700;
    --primary-200: #E66A00;
    --primary-300: #F07D00;

    /* Accent Colors */
    --accent-100: #ffc266;
    --accent-200: #ffad33;
    --accent-300: #ff9900;

    /* Background Colors */
    --background-100: #fffcf9;
    --background-200: #ffefe0;
    --background-300: #ffe3c6;

    /* Text Colors */
    --text-100: #231100;
    --text-200: #562a00;
    --text-300: #894300;

    /* Font Sizes - Desktop */
    --font-size-base: 1.25rem;
    --font-size-h1: 3.5rem;
    --font-size-h2: 2.75rem;
    --font-size-h3: 2rem;
    --font-size-h4: 1.625rem;
    --font-size-subtitle: 1.75rem;
    --font-size-btn: 1.125rem;
    --font-size-small: 1rem;

    /* Spacing - Desktop */
    --spacing-xs: 12px;
    --spacing-sm: 24px;
    --spacing-md: 48px;
    --spacing-lg: 96px;
    --spacing-xl: 120px;

    /* Container Sizes */
    --container-max: 1200px;
    --container-padding: 48px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s ease-in-out;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* --- General Styles --- */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

::selection {
    background-color: var(--primary-100);
    color: var(--background-100);
}

::-moz-selection {
    background-color: var(--primary-100);
    color: var(--background-100);
}

body {
    font-family: 'Urbanist', 'Kanit';
    margin: 0;
    background-color: var(--background-100);
    color: var(--text-200);
    line-height: 1.6;
    font-size: var(--font-size-base);
    filter: grayscale(0%);
    -webkit-filter: grayscale(0%);
}

/* Thai language support */
body:lang(th), [lang="th"] {
    font-family: 'Kanit';
}

/* English language support */
body:lang(en), [lang="en"] {
    font-family: 'Urbanist';
}

.content-wrapper {
    position: relative;
    z-index: 10;
    width: 100%;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

/* Main container spacing from nav - consistent across all pages */
main.container,
.content-wrapper main.container {
    margin-top: 0;
    padding-top: 0;
}

section {
    width: 100%;
    padding: var(--spacing-xl) 0;
    margin: 0;
}

section:nth-child(odd) {
}

section:nth-child(even) {
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-300);
    line-height: 1.3;
    font-weight: 600;
    margin-top: 0;
}

h1 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-h1);
    font-weight: 700;
}

h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-h3);
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-sm);
}

p {
    font-size: var(--font-size-base);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

small, .small-text {
    font-size: var(--font-size-small);
}

/* --- Navigation Bar --- */
nav {
    background-color: var(--primary-100);
    color: var(--background-100);
    padding: 0.75rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: transform var(--transition-slow);
    width: 100%;
}

.nav--hidden {
    transform: translateY(-120%);
    box-shadow: none;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    gap: 20px;
    max-width: 1200px;
}

nav .logo {
    flex-shrink: 0;
}

nav .logo img {
    height: 50px;
    display: block;
    object-fit: contain;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: nowrap;
    gap: 15px;
    justify-content: flex-end;
    align-items: center;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    color: var(--background-100);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 5px;
    transition: background-color var(--transition-normal);
    font-size: 1rem;
    white-space: nowrap;
    display: inline-block;
}

nav ul li a:hover {
    background-color: var(--primary-200);
}

/* --- Button --- */
.btn {
    display: inline-block;
    background-color: var(--primary-100);
    color: var(--background-100);
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 15px;
    transition: background-color 0.3s;
    border: none;
    font-size: var(--font-size-btn);
    font-weight: 500;
}

.btn:hover {
    background-color: var(--primary-200);
}

/* --- Personnel Cards --- */
.personnel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.card {
    background-color: #fff;
    border: 1px solid var(--background-300);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-200);
}

.card img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: var(--spacing-sm);
    object-fit: cover;
    border: 4px solid var(--background-200);
}

.card h3 {
    margin: var(--spacing-xs) 0;
    color: var(--text-200);
    font-size: 1.25rem;
    font-weight: 600;
}

.card h4 {
    margin: var(--spacing-xs) 0;
    color: var(--text-300);
    font-size: 1rem;
    font-weight: 500;
}

.card .title-th,
.card .title-en,
.card .email {
    margin: var(--spacing-xs) 0;
    font-size: 0.95rem;
}

/* Responsive for mobile - ใช้ auto-fit แล้ว ไม่ต้อง override */

.card p {
    font-size: 0.9rem;
    color: var(--text-200);
    margin: 0;
}

/* --- Tools List --- */
.tools-grid-2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.tool-card.featured {
    background-color: #fff;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 5px solid var(--primary-100);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.tool-card.featured:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--primary-200);
}

.tool-card.featured h3 {
    color: var(--primary-100);
    font-size: var(--font-size-h3);
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
}

.tool-card.featured p {
    color: var(--text-200);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.tool-item {
    border-left: 3px solid var(--accent-200);
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-top: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    transition: border-color var(--transition-fast);
}

.tool-item:hover {
    border-left-color: var(--primary-100);
}

/* --- Language Toggle Button (Floating Bottom Right) --- */
.lang-toggle-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--primary-100);
    border: 3px solid var(--background-100);
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 999;
}

.lang-toggle-btn:hover {
    background-color: var(--primary-200);
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

.lang-toggle-btn .flag-icon {
    font-size: 32px;
    line-height: 1;
    display: block;
}

@media (max-width: 768px) {
    .lang-toggle-btn {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }

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

/* --- Hamburger Menu & Responsive --- */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background-color: var(--background-100);
    border-radius: 5px;
}

@media (max-width: 768px) {
    .hamburger-btn {
        display: flex;
        flex-shrink: 0;
        margin-left: auto;
    }

    nav .container {
        padding: 10px 15px;
        gap: 10px;
        flex-wrap: nowrap;
    }

    nav .logo {
        flex: 0 0 auto;
        max-width: calc(100vw - 100px);
    }

    nav .logo img {
        height: 45px;
        max-height: 45px;
    }

    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--primary-100);
        flex-direction: column;
        text-align: center;
        padding: 10px 0;
        gap: 0;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        flex: none;
    }

    nav ul li {
        margin: 0;
        width: 100%;
    }

    nav ul li a {
        display: block;
        padding: 15px;
        width: 100%;
        font-size: 1rem;
    }

    nav ul.nav-links--active {
        display: flex;
    }

    .two-column-layout {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    nav .container {
        padding: 8px 10px;
        gap: 8px;
    }

    nav .logo {
        max-width: calc(100vw - 80px);
    }

    nav .logo img {
        height: 35px;
        max-height: 35px;
    }

    .hamburger-btn {
        width: 28px;
        height: 22px;
    }
}

/* --- Specific Page Styles --- */
.intro-heading .subtitle, .subtitle {
    font-size: var(--font-size-subtitle);
    font-weight: 400;
    color: var(--text-300);
    text-align: center;
    margin: 0 auto var(--spacing-lg) auto;
    max-width: 900px;
    line-height: 1.6;
}

.intro-logo {
    display: block;
    margin: var(--spacing-lg) auto;
    max-width: 420px;
    width: 100%;
    height: auto;
}

/* --- Two Column Layout --- */
.two-column-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.column {
    min-width: 0;
}

.column img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    display: block;
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.column-right {
    text-align: left;
}

.column-right h2 {
    margin-top: 0;
}

.column-right p {
    font-size: 1.05rem;
    line-height: 1.8;
}

/* --- Personnel Section Styles --- */
.personnel-tier {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.personnel-tier.specialist {
    flex-wrap: wrap;
}

#personnel .card {
    text-align: center;
    min-width: 320px;
    max-width: 380px;
}

#personnel .card img {
    width: 200px;
    height: 200px;
    border: 5px solid var(--background-200);
}

#personnel .card h2 {
    font-size: 1.5rem;
    margin: var(--spacing-sm) 0;
    font-weight: 600;
}

#personnel .card h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin: var(--spacing-xs) 0;
    color: var(--text-200);
}

.card .title-th {
    font-weight: 500;
    color: var(--text-200);
    margin: var(--spacing-sm) 0 0 0;
    font-size: 1.05rem;
}

.card .title-en {
    font-size: 0.95rem;
    color: var(--text-300);
    font-style: italic;
    margin: var(--spacing-xs) 0;
}

.card .email {
    font-size: 1rem;
    color: var(--text-200);
    margin: var(--spacing-xs) 0 0 0;
}

#personnel-promo {
    text-align: center;
}

/* --- Footer Styles --- */
footer {
    background-color: var(--text-100);
    color: var(--background-200);
    text-align: center;
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-lg);
}

footer p {
    margin: 0;
    font-size: var(--font-size-small);
}

/* --- Form Styles --- */
.form-section {
    margin-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group > label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-h4);
    color: var(--primary-100);
}

.form-group .factor-description {
    font-size: var(--font-size-small);
    color: var(--text-300);
    margin-top: calc(var(--spacing-xs) * -1);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea,
.form-group select {
    width: 100%;
    max-width: 600px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 2px solid var(--background-300);
    background-color: #fff;
    color: var(--text-200);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-100);
    box-shadow: 0 0 0 3px rgba(217, 87, 0, 0.1);
}

.radio-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.radio-group.vertical {
    flex-direction: column;
}

.radio-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
    background-color: #fff;
    padding: clamp(14px, 2.5vw, 18px) clamp(16px, 3vw, 20px);
    border-radius: var(--radius-sm);
    border: 2px solid var(--background-300);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 120px;
    min-height: 48px; /* Minimum touch target size (accessibility) */
    -webkit-tap-highlight-color: rgba(255, 127, 0, 0.1);
}

.radio-group label:hover {
    border-color: var(--primary-100);
    background-color: var(--background-200);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.radio-group label:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.radio-group input[type="radio"]:checked + label,
.radio-group label:has(input[type="radio"]:checked) {
    border-color: var(--primary-100);
    background-color: var(--background-200);
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(255, 127, 0, 0.15);
}

.radio-group input[type="radio"] {
    margin-right: clamp(10px, 2vw, 14px);
    width: clamp(22px, 3vw, 26px);
    height: clamp(22px, 3vw, 26px);
    cursor: pointer;
    flex-shrink: 0;
}

.form-submit-area {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.form-submit-area .btn {
    min-width: 200px;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-h4);
}

/* --- Typewriter Effect Styles --- */
.typewriter {
  display: inline-block; /* ทำให้กรอบพอดีกับข้อความ */
  overflow: hidden; /* ซ่อนข้อความที่ยังไม่ถูกพิมพ์ */
  white-space: nowrap; /* ป้องกันการขึ้นบรรทัดใหม่ระหว่างพิมพ์ */
  border-right: 0.15em solid var(--primary-100); /* สร้างเคอร์เซอร์สีส้ม */
  animation: 
    typing 3.5s steps(40, end) forwards, /* อนิเมชันการพิมพ์ */
    blink-caret .75s step-end infinite; /* อนิเมชันเคอร์เซอร์กะพริบ */
}

/* อนิเมชันการพิมพ์: ขยายความกว้างจาก 0% ไป 100% */
@keyframes typing {
  from { width: 0 }
  to { width: 100% }
}

/* อนิเมชันเคอร์เซอร์กะพริบ */
@keyframes blink-caret {
  from, to { border-color: transparent }
  50% { border-color: var(--primary-100); }
}

/* --- Memorial Popup Styles --- */
.memorial-popup {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    justify-content: center;
    align-items: flex-start;
    padding-top: 30px;
    overflow-y: auto;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.memorial-popup-content {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 0;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.memorial-image {
    width: 100vw;
    height: 100vh;
    object-fit: contain;
    display: block;
    filter: none !important;
    -webkit-filter: none !important;
}

.memorial-close {
    position: absolute;
    top: 20px;
    right: 20px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    background-color: rgba(0, 0, 0, 0.7);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
    border: 2px solid #fff;
    line-height: 1;
    z-index: 10000;
}

.memorial-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

/* ===================================
   RESPONSIVE DESIGN - MEDIA QUERIES
   =================================== */

/* --- Extra Large Screens (1920px+) --- */
@media screen and (min-width: 1920px) {
    .container {
        max-width: 1600px;
    }
}

/* --- Tablets & Landscape (768px - 1024px) --- */
@media screen and (min-width: 768px) and (max-width: 1024px) {
    :root {
        --container-padding: 32px;
        --spacing-xl: 80px;
        --spacing-lg: 64px;
        --font-size-h1: 2.5rem;
        --font-size-h2: 2rem;
        --font-size-h3: 1.5rem;
    }

    .container {
        max-width: 100%;
    }

    .personnel-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: 32px;
    }

    .two-column-layout {
        gap: 48px;
    }

    .tools-grid-2col {
        gap: 32px;
    }

    #personnel .card {
        min-width: 280px;
        max-width: 320px;
    }

    #personnel .card img {
        width: 160px;
        height: 160px;
    }
}

/* Landscape mode specific */
@media screen and (min-width: 768px) and (max-width: 1024px) and (orientation: landscape) {
    nav .logo img {
        height: 50px;
    }

    nav ul li a {
        font-size: 0.95rem;
        padding: 8px 14px;
    }
}

/* --- Mobile Devices (max 768px) --- */
@media screen and (max-width: 768px) {
    :root {
        --font-size-base: 1rem;
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --font-size-h3: 1.375rem;
        --font-size-h4: 1.125rem;
        --font-size-subtitle: 1.25rem;
        --spacing-xl: 64px;
        --spacing-lg: 48px;
        --spacing-md: 32px;
        --spacing-sm: 16px;
        --spacing-xs: 8px;
        --container-padding: 24px;
    }

    nav .logo img {
        height: 45px;
    }

    nav .container {
        padding: 0 20px;
    }

    section {
        padding: var(--spacing-lg) 0;
    }

    .intro-logo {
        max-width: 300px;
        margin: var(--spacing-md) auto;
    }

    .two-column-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .tools-grid-2col {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .personnel-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .card img {
        width: 100px;
        height: 100px;
    }

    #personnel .card {
        min-width: auto;
        max-width: 100%;
    }

    #personnel .card img {
        width: 150px;
        height: 150px;
    }

    .personnel-tier {
        flex-direction: column;
        align-items: center;
    }

    .memorial-popup {
        padding-top: 0;
    }

    .memorial-close {
        top: 15px;
        right: 15px;
        font-size: 32px;
        width: 42px;
        height: 42px;
    }
}

/* --- Small Mobile (max 480px) --- */
@media screen and (max-width: 480px) {
    :root {
        --font-size-base: 0.9375rem;
        --font-size-h1: 1.75rem;
        --font-size-h2: 1.5rem;
        --font-size-h3: 1.25rem;
        --font-size-h4: 1.0625rem;
        --font-size-subtitle: 1.125rem;
        --spacing-xl: 48px;
        --spacing-lg: 32px;
        --spacing-md: 24px;
        --spacing-sm: 12px;
        --spacing-xs: 6px;
        --container-padding: 16px;
    }

    nav .logo img {
        height: 40px;
    }

    nav .container {
        padding: 0 16px;
        gap: 12px;
    }

    .intro-logo {
        max-width: 240px;
    }

    .btn {
        padding: 12px 24px;
        width: 100%;
        text-align: center;
        font-size: 1rem;
    }

    .card img {
        width: 80px;
        height: 80px;
    }

    #personnel .card img {
        width: 120px;
        height: 120px;
    }

    .card h3 {
        font-size: 1.1rem;
    }

    .card h4 {
        font-size: 0.95rem;
    }

    .form-group input[type="text"],
    .form-group input[type="email"],
    .form-group textarea,
    .form-group select {
        max-width: 100%;
    }
}

/* ===================================
   PAGE-SPECIFIC ENHANCEMENTS
   =================================== */

/* --- Demo & Tool Pages --- */
.demo-container,
.tool-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--container-padding);
}

.demo-section,
.tool-section {
    background: #fff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.demo-section h2,
.tool-section h2 {
    color: var(--primary-100);
    border-bottom: 3px solid var(--background-300);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

/* --- Video & Image Responsive --- */
video,
iframe,
.video-container {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
}

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

/* --- Result Pages --- */
.result-container {
    max-width: 900px;
    margin: var(--spacing-xl) auto;
    padding: var(--spacing-lg);
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.result-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--background-300);
}

.result-score {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-100);
    margin: var(--spacing-md) 0;
}

.result-section {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--background-200);
    border-radius: var(--radius-md);
}

/* --- Page Language Toggle (for homepage) --- */
.page-language-toggle {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) auto var(--spacing-lg);
    flex-wrap: wrap;
}

.page-lang-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--primary-100);
    background: white;
    color: var(--primary-100);
    border-radius: 50px;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.page-lang-btn.active {
    background: var(--primary-100);
    color: white;
    box-shadow: var(--shadow-md);
    transform: scale(1.05);
}

.page-lang-btn:hover:not(.active) {
    background: var(--primary-200);
    color: white;
    border-color: var(--primary-200);
    transform: scale(1.03);
}

/* --- Intro Text --- */
.intro-text {
    font-size: 1.05rem;
    line-height: 1.8;
    text-align: justify;
    color: var(--text-200);
}

@media screen and (max-width: 768px) {
    .demo-section,
    .tool-section {
        padding: var(--spacing-md);
    }

    .result-container {
        padding: var(--spacing-md);
    }

    .result-score {
        font-size: 2.5rem;
    }

    .intro-text {
        text-align: left;
    }
}

@media screen and (max-width: 480px) {
    .result-score {
        font-size: 2rem;
    }

    .page-lang-btn {
        font-size: 0.95rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}