/* ===== CSS Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2C6E49;
    --primary-dark: #1A4D2E;
    --secondary: #FFA500;
    --accent: #FF6B35;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --shadow: 0 2px 15px rgba(0,0,0,0.1);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
    --radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.3;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

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

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

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo a {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo h1 {
    font-size: 28px;
    color: var(--primary);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo .tagline {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 400;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.main-nav ul {
    display: flex;
    gap: 30px;
    align-items: center;
}

.main-nav a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
}

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

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

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

.header-cta .btn-primary {
    padding: 10px 25px;
    font-size: 14px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.4)), 
                url('https://images.unsplash.com/photo-1564349683136-77e08dba1ef7?w=1920&q=80') center/cover no-repeat;
    background-attachment: fixed;
    margin-top: 70px;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(44, 110, 73, 0.7), rgba(255, 107, 53, 0.5));
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: white;
    padding: 0 20px;
    max-width: 800px;
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s;
    animation-fill-mode: both;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s;
    animation-fill-mode: both;
}

/* ===== Buttons ===== */
.btn-primary {
    display: inline-block;
    padding: 14px 35px;
    background: var(--primary);
    color: white;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    border: 2px solid var(--primary);
    cursor: pointer;
    text-align: center;
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(44, 110, 73, 0.3);
}

.btn-secondary {
    display: inline-block;
    padding: 14px 35px;
    background: transparent;
    color: white;
    border: 2px solid white;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    cursor: pointer;
}

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

.btn-text {
    color: var(--primary);
    font-weight: 600;
    font-size: 15px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.btn-text:hover {
    gap: 10px;
    color: var(--primary-dark);
}

/* ===== Quick Services ===== */
.quick-services {
    padding: 80px 0;
    background: var(--bg-white);
    margin-top: -50px;
    position: relative;
    z-index: 10;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.service-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}

.service-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.service-card p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 15px;
}

.service-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
}

.service-link:hover {
    color: var(--primary-dark);
}

/* ===== Featured Tours ===== */
.featured-tours {
    padding: 100px 0;
    background: var(--bg-light);
}

.section-title {
    font-size: 36px;
    text-align: center;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 50px;
    font-size: 18px;
}

.tours-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.tour-card {
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.tour-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.tour-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

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

.tour-card:hover .tour-image img {
    transform: scale(1.1);
}

.tour-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--accent);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.tour-content {
    padding: 25px;
}

.tour-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.tour-content p {
    color: var(--text-light);
    margin-bottom: 15px;
    font-size: 14px;
    line-height: 1.6;
}

.tour-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

.tour-meta .duration {
    font-size: 14px;
    color: var(--text-light);
}

.tour-meta .price {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

/* ===== Why Choose Us ===== */
.why-choose-us {
    padding: 100px 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 30px 20px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.feature-item:hover {
    background: var(--bg-light);
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: block;
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.feature-item p {
    color: var(--text-light);
    font-size: 15px;
}

/* ===== About Chengdu ===== */
.about-chengdu {
    padding: 100px 0;
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 16px;
    line-height: 1.8;
}

.about-text .btn-secondary {
    color: var(--primary);
    border-color: var(--primary);
    margin-top: 10px;
}

.about-text .btn-secondary:hover {
    background: var(--primary);
    color: white;
}

.about-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

/* ===== Travel Tips ===== */
.travel-tips {
    padding: 100px 0;
    background: white;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.tip-card {
    padding: 30px;
    background: var(--bg-light);
    border-radius: var(--radius);
    transition: var(--transition);
    border-left: 4px solid var(--primary);
}

.tip-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow);
}

.tip-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.tip-card p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.6;
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 36px;
    margin-bottom: 15px;
}

.cta-content p {
    font-size: 18px;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-section .btn-primary {
    background: white;
    color: var(--primary);
    border-color: white;
}

.cta-section .btn-primary:hover {
    background: transparent;
    color: white;
}

/* ===== Footer ===== */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: white;
}

.footer-section h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: white;
}

.footer-section p {
    color: #999;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #999;
    transition: var(--transition);
    font-size: 15px;
}

.footer-section ul li a:hover {
    color: white;
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    font-size: 24px;
    transition: var(--transition);
}

.social-links a:hover {
    transform: translateY(-3px);
    display: inline-block;
}

.contact-info li {
    color: #999;
    font-size: 15px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
    color: #999;
    font-size: 14px;
}

.footer-bottom a {
    color: #999;
}

.footer-bottom a:hover {
    color: white;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        transition: var(--transition);
        padding: 20px;
    }
    
    .main-nav.active {
        left: 0;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 20px;
    }
    
    .header-cta {
        display: none;
    }
    
    .hero h1 {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .hero h1 {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
}