/* Global Styles & Variables */
:root {
    /* Fonts */
    --font-primary: 'Kanit', sans-serif;

    /* Transition Speeds */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Light Theme Variables */
.light-theme {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.15);
    
    --secondary: #0ea5e9;
    --secondary-hover: #0284c7;
    
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;

    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --header-bg: rgba(255, 255, 255, 0.8);
    --mockup-bg: #e2e8f0;
    
    --badge-bg: rgba(99, 102, 241, 0.1);
    --badge-text: #4f46e5;

    --btn-secondary-bg: #e2e8f0;
    --btn-secondary-text: #334155;
    --btn-secondary-hover: #cbd5e1;
}

/* Dark Theme Variables */
.dark-theme {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --border-color: #374151;
    
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --primary-glow: rgba(129, 140, 248, 0.25);
    
    --secondary: #38bdf8;
    --secondary-hover: #0ea5e9;
    
    --accent-purple: #a78bfa;
    --accent-green: #34d399;
    --accent-orange: #fbbf24;
    --accent-red: #f87171;

    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 25px 30px -5px rgba(0, 0, 0, 0.45), 0 12px 15px -5px rgba(0, 0, 0, 0.2);
    --header-bg: rgba(11, 15, 25, 0.8);
    --mockup-bg: #1f2937;

    --badge-bg: rgba(129, 140, 248, 0.15);
    --badge-text: #a5b4fc;

    --btn-secondary-bg: #1f2937;
    --btn-secondary-text: #e5e7eb;
    --btn-secondary-hover: #374151;
}

/* General Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* Layout Utilities */
.header, .hero-container, .features-section, .demo-section, .gallery-section, .cta-banner-container, .footer {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 20px;
    padding-right: 20px;
}

/* Button Component */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-primary);
    font-weight: 600;
    text-align: center;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-md {
    padding: 10px 20px;
    font-size: 1rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px var(--primary-glow);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background-color: var(--btn-secondary-hover);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    border-color: var(--primary);
    background-color: var(--badge-bg);
    color: var(--primary);
    transform: translateY(-2px);
}

/* Header & Nav */
.header {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--header-bg);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.5rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.logo-dot {
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 5px 0;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width var(--transition-fast);
}

.nav-menu a:hover::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Language Selector styling */
.lang-selector select {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 12px;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition-fast);
}

.lang-selector select:focus {
    border-color: var(--primary);
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
    color: var(--primary);
    border-color: var(--primary);
}

/* Toggle Sun/Moon Icon Visibility */
.dark-theme .sun-icon {
    display: block;
}
.dark-theme .moon-icon {
    display: none;
}
.light-theme .sun-icon {
    display: none;
}
.light-theme .moon-icon {
    display: block;
}

/* Hero Section */
.hero-section {
    position: relative;
    padding-top: 150px;
    padding-bottom: 80px;
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: -150px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 50px;
}

.hero-text-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-badge {
    background-color: var(--badge-bg);
    color: var(--badge-text);
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.hero-section h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 35px;
    max-width: 580px;
}

.hero-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Mockup Frame Styling */
.hero-mockup-container {
    display: flex;
    justify-content: center;
    perspective: 1000px;
}

.mockup-frame {
    background-color: var(--mockup-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--card-shadow-hover);
    overflow: hidden;
    transition: transform var(--transition-slow);
    max-width: 100%;
}

.mockup-frame:hover {
    transform: rotateY(-3deg) rotateX(2deg) translateY(-5px);
}

.mockup-browser-header {
    height: 38px;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 15px;
    gap: 6px;
    position: relative;
}

.mockup-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.mockup-dot.red { background-color: #ef4444; }
.mockup-dot.yellow { background-color: #f59e0b; }
.mockup-dot.green { background-color: #10b981; }

.mockup-address-bar {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    max-width: 300px;
    height: 22px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mockup-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* Features Section */
.features-section {
    padding: 80px 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 35px 30px;
    box-shadow: var(--card-shadow);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

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

.feature-icon-wrapper {
    width: 54px;
    height: 54px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.feature-icon-wrapper svg {
    width: 24px;
    height: 24px;
}

/* Dynamic Badge Colors */
.feature-icon-wrapper.purple { background-color: rgba(139, 92, 246, 0.1); color: var(--accent-purple); }
.feature-icon-wrapper.blue { background-color: rgba(14, 165, 233, 0.1); color: var(--secondary); }
.feature-icon-wrapper.orange { background-color: rgba(245, 158, 11, 0.1); color: var(--accent-orange); }
.feature-icon-wrapper.green { background-color: rgba(16, 185, 129, 0.1); color: var(--accent-green); }
.feature-icon-wrapper.red { background-color: rgba(239, 68, 68, 0.1); color: var(--accent-red); }
.feature-icon-wrapper.yellow { background-color: rgba(99, 102, 241, 0.1); color: var(--primary); }

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Demo Section */
.demo-section {
    padding: 80px 20px;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.demo-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.demo-block {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 35px;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
}

.demo-block-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.demo-block-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 30px;
}

/* Demo 1: Flip Card Styles */
.card-simulator-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 250px;
    margin-bottom: 25px;
}

.flip-card-outer {
    width: 100%;
    max-width: 360px;
    height: 220px;
    perspective: 1000px;
    cursor: pointer;
    outline: none;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.flip-card-outer.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 12px;
    border: 2px dashed var(--border-color);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: border-color var(--transition-fast);
}

.flip-card-front {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.flip-card-back {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transform: rotateY(180deg);
}

.flip-card-outer:hover .flip-card-front, .flip-card-outer:hover .flip-card-back {
    border-color: var(--primary);
}

.card-category-tag {
    background-color: var(--badge-bg);
    color: var(--badge-text);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.card-category-tag.correct {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.card-content {
    font-size: 1.15rem;
    font-weight: 500;
    margin: 15px 0;
}

.card-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.demo-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
}

/* Demo 2: Trivia Simulator */
.trivia-simulator-wrapper {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    flex: 1;
    justify-content: space-between;
}

.trivia-simulator-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 20px;
}

.trivia-category {
    font-weight: 600;
    color: var(--secondary);
    font-size: 0.9rem;
}

.trivia-xp-badge {
    background-color: var(--badge-bg);
    color: var(--badge-text);
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.85rem;
}

.trivia-question-box {
    margin-bottom: 20px;
    min-height: 50px;
}

.trivia-question-box p {
    font-size: 1.1rem;
    font-weight: 500;
}

.trivia-options-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 20px;
}

.trivia-option {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 12px 16px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
}

.trivia-option:hover {
    border-color: var(--primary);
    background-color: var(--bg-tertiary);
    transform: translateX(4px);
}

/* Trivia feedback and status colors */
.trivia-option.correct {
    background-color: rgba(16, 185, 129, 0.15) !important;
    border-color: var(--accent-green) !important;
    color: var(--accent-green) !important;
    font-weight: 600;
}

.trivia-option.incorrect {
    background-color: rgba(239, 68, 68, 0.15) !important;
    border-color: var(--accent-red) !important;
    color: var(--accent-red) !important;
}

.trivia-feedback {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-radius: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    animation: slideUp var(--transition-normal);
}

.trivia-feedback p {
    font-weight: 600;
}

.trivia-feedback.correct p {
    color: var(--accent-green);
}

.trivia-feedback.incorrect p {
    color: var(--accent-red);
}

.trivia-feedback.hidden {
    display: none;
}

/* Gallery Section */
.gallery-section {
    padding: 80px 20px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.gallery-item {
    display: flex;
    flex-direction: column;
}

.gallery-label {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.gallery-image-wrapper {
    background-color: var(--mockup-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all var(--transition-normal);
}

.gallery-image-wrapper:hover {
    transform: scale(1.02);
    box-shadow: var(--card-shadow-hover);
    border-color: var(--primary);
}

.gallery-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* CTA Banner Section */
.cta-banner {
    position: relative;
    padding: 100px 20px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    text-align: center;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

.cta-banner-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 60%);
    z-index: 1;
    pointer-events: none;
}

.cta-banner-container {
    position: relative;
    z-index: 2;
    max-width: 650px;
    margin: 0 auto;
}

.cta-banner h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.cta-banner p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 35px;
}

.cta-banner-actions {
    display: flex;
    justify-content: center;
}

/* Footer Section */
.footer {
    padding-top: 80px;
    padding-bottom: 40px;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-brand {
    max-width: 400px;
}

.footer-brand .logo-area {
    margin-bottom: 20px;
}

.footer-brand-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-link-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-link-group h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.footer-link-group a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-link-group a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-secondary);
    font-weight: 500;
    text-decoration: underline;
}

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

/* Keyframe Animations */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Rules */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-text-content {
        align-items: center;
    }

    .hero-section h1 {
        font-size: 3rem;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-mockup-container {
        max-width: 700px;
        margin: 0 auto;
    }

    .demo-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .header-container {
        height: 60px;
    }

    .btn-header-cta {
        display: none !important; /* Hide Launch App CTA on small screens */
    }

    .nav-menu {
        display: none; /* simple hidden navigation for mobile */
    }

    .hero-section {
        padding-top: 100px;
        padding-bottom: 50px;
    }

    .hero-section h1 {
        font-size: 2.4rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-container {
        flex-direction: column;
        gap: 35px;
    }

    .footer-links {
        gap: 40px;
        justify-content: space-between;
    }
}