:root {
    /* Semantic Colors */
    --primary: #AA6C39;
    --primary-light: #C08C5D;
    --primary-dark: #8D562B;
    --background: #F0EEE9;
    --surface: #FFFFFF;
    --text-main: #2D2A26;
    --text-muted: #6B665F;
    --gold: #D4AF37;
    --gold-light: #F9F0D1;
    --focus-ring: rgba(170, 108, 57, 0.4);
    
    /* Effects */
    --card-shadow: 0 8px 24px rgba(45, 42, 38, 0.06);
    --glass-bg: rgba(240, 238, 233, 0.85);
    
    /* Typography */
    --font-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
    --font-thai: 'Mitr', 'Plus Jakarta Sans', system-ui, sans-serif;
    
    /* Fluid Spacing */
    --space-xs: clamp(0.5rem, 1vw, 1rem);
    --space-sm: clamp(1rem, 2vw, 1.5rem);
    --space-md: clamp(1.5rem, 4vw, 2.5rem);
    --space-lg: clamp(3rem, 6vw, 5rem);
    --space-xl: clamp(5rem, 10vw, 8rem);
    
    /* Layout */
    --container-max: 1200px;
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 32px;
    
    --transition: 0.3s cubic-bezier(0.2, 0, 0, 1);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

:lang(th) body, :lang(th) input, :lang(th) button, :lang(th) textarea {
    font-family: var(--font-thai);
}

h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.1;
    color: var(--text-main);
    text-wrap: balance;
}

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

ul {
    list-style: none;
}

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

/* Accessibility */
:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 4px;
    border-radius: 4px;
}

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.line-clamp {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    line-clamp: 2;
    overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Layout */
.container {
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-sm);
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 700;
    text-align: center;
    transition: transform var(--transition), background-color var(--transition), box-shadow var(--transition);
    font-size: 1rem;
    min-height: 44px;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(170, 108, 57, 0.2);
}

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

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

.btn-pro {
    background-color: var(--gold);
    color: var(--surface);
}
.btn-pro:hover {
    background-color: #C29F2F;
    transform: translateY(-2px);
}

.text-btn {
    font-size: 1rem;
    color: inherit;
    text-align: left;
    padding-block: 0.25rem;
    opacity: 0.7;
    transition: opacity var(--transition), padding-inline-start var(--transition);
}

.text-btn:hover {
    opacity: 1;
    padding-inline-start: 4px;
}

/* Header */
#header {
    position: fixed;
    top: 0;
    inset-inline: 0;
    z-index: 1000;
    padding-block: var(--space-md);
    transition: background-color var(--transition), padding-block var(--transition), box-shadow var(--transition);
}

#header.scrolled {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding-block: var(--space-sm);
    box-shadow: 0 1px 12px rgba(0,0,0,0.04);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.logo {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    flex-wrap: wrap;
}

.lang-switch {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.lang-switch button {
    font-weight: 700;
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: color var(--transition), background-color var(--transition);
}

.lang-switch button.active {
    color: var(--primary);
    background-color: rgba(170, 108, 57, 0.1);
}

.lang-switch button:hover:not(.active) {
    color: var(--text-main);
}

.separator {
    opacity: 0.3;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Hero */
.hero {
    padding-block-start: var(--space-xl);
    padding-block-end: var(--space-lg);
}

.hero-layout {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    flex-direction: column;
}

@media (min-width: 992px) {
    .hero-layout {
        flex-direction: row;
    }
}

.hero-content {
    flex: 1;
    min-width: 0;
}

.hero-image {
    flex: 1;
    position: relative;
    width: 100%;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    object-fit: cover;
    aspect-ratio: 1/1;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    margin-block-end: var(--space-sm);
    letter-spacing: -0.02em;
}

.hero p {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    color: var(--text-muted);
    margin-block-end: var(--space-md);
    max-width: 60ch;
}

.hero-btns {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 10px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--primary);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

#header.menu-open .menu-toggle span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

#header.menu-open .menu-toggle span:nth-child(2) {
    opacity: 0;
}

#header.menu-open .menu-toggle span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

@media (max-width: 991px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--surface);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 4rem 2rem;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
        transition: right 0.4s var(--transition);
        z-index: 999;
    }

    #header.menu-open .nav-links {
        right: 0;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        font-size: 1.25rem;
        display: block;
        padding: 1rem;
    }

    .lang-switch {
        padding: 1.5rem 0;
        justify-content: center;
        width: 100%;
        border-block: 1px solid var(--background);
        margin-block: 1rem;
    }
}

/* Features */
.features {
    padding-block: var(--space-lg);
    background-color: var(--surface);
}

.section-header {
    text-align: left;
    margin-block-end: var(--space-lg);
    max-width: 800px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-block-end: 0.5rem;
    letter-spacing: -0.01em;
}

.section-header p {
    color: var(--text-muted);
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    gap: var(--space-md);
}

.feature-card {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    background: var(--background);
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--surface);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-block-end: var(--space-sm);
    font-size: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.feature-card h3 {
    margin-block-end: 0.5rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Pro Section */
.pro {
    padding-block: var(--space-lg);
    background: var(--background);
}

.pro-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    position: relative;
    overflow: hidden;
    flex-direction: column;
}

@media (min-width: 992px) {
    .pro-card {
        flex-direction: row;
        padding: var(--space-lg);
    }
}

.pro-card::before {
    content: 'PLUS';
    position: absolute;
    top: 2rem;
    right: -2rem;
    background: var(--gold);
    color: var(--surface);
    padding: 0.25rem 3rem;
    transform: rotate(45deg);
    font-weight: 800;
    letter-spacing: 1px;
    font-size: 0.85rem;
}

.pro-info {
    flex: 1;
    min-width: 0;
}

.pro-image {
    flex: 1;
    width: 100%;
}

.pro-highlight-img {
    width: 100%;
    height: auto;
    border: 3px solid var(--gold);
    border-radius: var(--radius-md);
    aspect-ratio: 1/1;
    object-fit: cover;
}

.pro h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-block-end: 1rem;
}

.pro-list {
    margin-block: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pro-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-weight: 600;
}

.pro-list li::before {
    content: '✦';
    color: var(--gold);
    font-size: 1.25rem;
    line-height: 1;
}

/* Community */
.community {
    padding-block: var(--space-lg);
    background: var(--surface);
}

.community-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 350px), 1fr));
    gap: var(--space-md);
}

.community-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    aspect-ratio: 1/1;
    background: var(--background);
}

.community-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition);
}

.community-item:hover img {
    transform: scale(1.03);
}

.community-overlay {
    position: absolute;
    inset-block-end: 0;
    inset-inline: 0;
    padding: var(--space-sm);
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: var(--surface);
}

.community-overlay p {
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: var(--text-main);
    color: var(--surface);
    padding-block-start: var(--space-lg);
    padding-block-end: var(--space-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-block-end: var(--space-lg);
}

@media (min-width: 992px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    margin-block-end: 1rem;
    color: var(--primary-light);
}

.footer-text {
    opacity: 0.8;
    max-width: 300px;
    font-size: 0.95rem;
}

.footer-links h4 {
    color: var(--surface);
    margin-block-end: 1rem;
    font-size: 1.1rem;
}

.footer-links ul li {
    margin-block-end: 0.5rem;
}

.footer-links a {
    opacity: 0.7;
    font-size: 0.95rem;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-bottom {
    padding-block-start: var(--space-md);
    border-block-start: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    opacity: 0.6;
    font-size: 0.9rem;
}

/* Modals */
dialog {
    margin: auto;
    padding: 0;
    border: none;
    border-radius: var(--radius-lg);
    background: var(--surface);
    color: var(--text-main);
    width: 90vw;
    max-width: 700px;
    max-height: 85vh;
    box-shadow: 0 24px 48px rgba(0,0,0,0.2);
}

dialog::backdrop {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-inner {
    display: flex;
    flex-direction: column;
    max-height: inherit;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    border-block-end: 1px solid var(--background);
}

.modal-header h2 {
    font-size: 1.5rem;
}

.close-modal {
    font-size: 2rem;
    line-height: 1;
    color: var(--text-muted);
    padding: 0.5rem;
    margin: -0.5rem;
    border-radius: 50%;
    transition: background-color var(--transition), color var(--transition);
}

.close-modal:hover {
    color: var(--primary);
    background-color: var(--background);
}

.modal-text {
    padding: var(--space-md);
    overflow-y: auto;
    white-space: pre-wrap;
    font-size: 1rem;
    overscroll-behavior: contain;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    will-change: transform, opacity;
    transition: opacity 0.6s var(--transition), transform 0.6s var(--transition);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}