/* CSS Variables cho Phong cách Vietnamese Premium */
:root {
    --primary-color: #8B0000; /* Đỏ thẫm truyền thống */
    --gold-color: #D4AF37; /* Vàng đồng */
    --dark-bg: #111111;
    --light-bg: #F8F5F2; /* Trắng ngà */
    --text-color: #333333;
    --text-light: #F0F0F0;
    
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: #FFFFFF;
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 100px 0;
}

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

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

/* Typography Utility */
.subtitle {
    color: var(--gold-color);
    font-family: var(--font-body);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 10px;
    display: block;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.bg-dark .section-header h2 {
    color: var(--gold-color);
}

.divider {
    height: 3px;
    width: 60px;
    background-color: var(--gold-color);
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-family: var(--font-body);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: transparent;
    color: var(--primary-color);
    background: #FFFFFF;
    border-color: #FFFFFF;
}

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

.btn-outline:hover {
    background-color: var(--gold-color);
    color: var(--dark-bg);
}

/* Navbar */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.4s ease;
}

nav.scrolled {
    background: rgba(17, 17, 17, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

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

.logo a {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    color: #FFFFFF;
    font-weight: 700;
}

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

nav:not(.scrolled) .logo a {
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

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

.nav-links li a {
    color: #FFFFFF;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

nav.scrolled .nav-links li a {
    text-shadow: none;
}

.nav-links li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--gold-color);
    transition: width 0.3s ease;
}

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

/* Hero Section */
#hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    text-align: left;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: right center;
    background-repeat: no-repeat;
    z-index: -2;
    transform: scale(1.05); /* Lấy đà cho animation nếu muốn */
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.7) 100%);
    z-index: -1;
}

.hero-content {
    color: #FFFFFF;
    margin: 0;
    padding-left: 10%;
    width: 100%;
}

.hero-title {
    font-size: 5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--gold-color);
    text-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

.hero-subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 0 40px 0;
    font-weight: 300;
    text-shadow: 0 2px 5px rgba(0,0,0,0.5);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: #555;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 30px;
    background-color: var(--light-bg);
    padding: 40px;
    border-left: 4px solid var(--primary-color);
}

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

.stat-number {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: 1rem;
    color: #666;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Heritage Section */
.heritage-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.heritage-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

.heritage-content h2 {
    font-size: 2.5rem;
    color: var(--gold-color);
    margin-bottom: 20px;
}

.heritage-content p {
    margin-bottom: 20px;
    color: #ccc;
}

/* Destinations Section */
.destinations-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.dest-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.dest-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.1);
}

.dest-image {
    height: 300px;
    overflow: hidden;
}

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

.dest-card:hover .dest-image img {
    transform: scale(1.05);
}

.dest-info {
    padding: 30px;
}

.dest-info h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.dest-info p {
    color: #666;
}

/* Cuisine Section */
.cuisine-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.cuisine-content h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.cuisine-content p {
    margin-bottom: 20px;
    color: #555;
}

.cuisine-image {
    position: relative;
}

.cuisine-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--gold-color);
    z-index: 0;
}

.cuisine-image img {
    width: 100%;
    position: relative;
    z-index: 1;
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: #999;
    padding: 60px 0 30px 0;
    text-align: center;
}

.footer-brand h2 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 10px;
}

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

.footer-brand p {
    margin-bottom: 30px;
}

.footer-links p {
    font-size: 0.9rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
}

/* Animations using Intersection Observer */
.fade-in {
    opacity: 0;
    transition: opacity 0.8s ease-out;
}

.fade-in.appear {
    opacity: 1;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.fade-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Responsive */
@media (max-width: 992px) {
    .about-grid, .heritage-grid, .destinations-grid, .cuisine-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 4rem;
    }
    
    .cuisine-image::before {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* Simplification for demo: hide nav links on mobile, or implement hamburger */
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
}