/* Color Palette & Variables */
:root {
    --primary: #1B4332;    /* Deep Forest Green (High Contrast) */
    --primary-light: #2D6A4F; 
    --primary-pale: #EDF6F0;  /* Soft Sage Tint */
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFC;
    --text-dark: #1E293B;
    --text-muted: #475569;
    --font-sans: 'Inter', 'Noto Sans Thai', sans-serif;
    --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--primary);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.75rem; }
h3 { font-size: 1.75rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

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

img {
    max-width: 100%;
    display: block;
}

/* Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
}

.bg-light {
    background-color: var(--bg-light);
}

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

.mt-2 {
    margin-top: 3rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: var(--primary-light);
    color: var(--bg-white);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(45, 106, 79, 0.2);
}

.btn-block {
    display: block;
    width: 100%;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 1rem 0;
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    font-weight: 600;
    color: var(--text-dark);
}

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

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 60px; /* Offset for navbar */
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(15, 23, 42, 0.38) 0%, rgba(15, 23, 42, 0.65) 100%);
    z-index: -1;
}

.hero-content {
    max-width: 820px;
    padding: 2.5rem 2rem;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.18);
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1rem;
    color: var(--primary);
    letter-spacing: -0.02em;
    animation: slideUp 1s ease-out;
}

.hero-content p {
    font-size: 1.15rem;
    margin-bottom: 2rem;
    color: var(--text-muted);
    animation: slideUp 1s ease-out 0.2s backwards;
}

.hero-content .btn {
    animation: slideUp 1s ease-out 0.4s backwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Concept Section */
.concept-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4rem;
}

.concept-text {
    flex: 1;
    min-width: 300px;
}

.concept-text h2 {
    font-size: 3.25rem;
}

.concept-stats {
    flex: 1;
    min-width: 300px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.stat {
    background-color: var(--primary-pale);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
}

.stat:hover {
    transform: translateY(-5px);
    background-color: var(--primary);
}

.stat:hover h3, .stat:hover p {
    color: var(--bg-white);
}

.stat h3 {
    font-size: 3.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.stat p {
    margin: 0;
    font-weight: 600;
    transition: var(--transition);
}

/* Gallery Section */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.gallery-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    aspect-ratio: 4/3;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.gallery-item-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    background: linear-gradient(transparent, rgba(33, 37, 41, 0.8));
    color: var(--bg-white);
    opacity: 0;
    transition: var(--transition);
    display: flex;
    align-items: flex-end;
}

.gallery-item-overlay span {
    font-weight: 600;
    font-size: 1.2rem;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-item:hover .gallery-item-overlay {
    opacity: 1;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.feature-card {
    background-color: var(--bg-white);
    padding: 3rem 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    border: 1px solid rgba(45, 106, 79, 0.1);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(45, 106, 79, 0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: var(--primary-pale);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background-color: var(--primary);
    color: var(--bg-white);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* Contact Section */
.contact-container {
    display: flex;
    flex-wrap: wrap;
    gap: 4rem;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-detail, .contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-dark);
}

.contact-detail svg, .contact-item svg, .contact-item i {
    color: var(--primary);
}

.contact-form {
    flex: 1;
    min-width: 300px;
    background-color: var(--bg-white);
    padding: 3rem;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input {
    width: 100%;
    padding: 1rem;
    border: 1px solid #E9ECEF;
    border-radius: 8px;
    font-family: var(--font-sans);
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-pale);
}

.form-success {
    display: none;
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--primary-pale);
    color: var(--primary);
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
}

/* Footer */
footer {
    background-color: var(--text-dark);
    color: var(--bg-white);
    padding: 3rem 0;
}

footer p {
    margin: 0;
    color: rgba(255,255,255,0.6);
}

/* Animation Utilities */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple hidden for mobile in this mockup */
    }
    
    .hero-content h1 {
        font-size: 3.25rem;
    }
    
    .section {
        padding: 4rem 0;
    }
    
    .contact-form {
        padding: 2rem;
    }
}