:root {
    --bg: #071014;
    --bg-deep: #03070a;
    --bg-soft: #0d1b1f;
    --aurora-green: #5fd08c;
    --aurora-bright: #7fffb5;
    --aurora-teal: #2ba99a;
    --midnight-blue: #102734;
    --mist: rgba(120, 255, 180, 0.08);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.10);
    --text-primary: #f2eadf;
    --text-secondary: #d0c8bc;
    --text-muted: #9f9a92;
    --warm-accent: #d8c6a3;
    --cta-dark: #0d171b;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --font-heading: 'PT Serif', serif;
    --font-body: 'Inter', sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    font-size: 1rem;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

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

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

section {
    padding: 6rem 5%;
    position: relative;
    z-index: 2;
}

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

/* Background System */
.bg-system {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
    background: radial-gradient(circle at 50% 100%, var(--bg-soft), var(--bg-deep));
}

.aurora-glow {
    position: absolute;
    top: -20%;
    left: 10%;
    width: 80vw;
    height: 60vh;
    background: radial-gradient(ellipse at center, rgba(95, 208, 140, 0.15) 0%, rgba(43, 169, 154, 0.05) 40%, transparent 70%);
    filter: blur(80px);
    opacity: 0.8;
    animation: aurora-drift 20s infinite alternate linear;
}

.aurora-glow-secondary {
    position: absolute;
    bottom: 20%;
    right: -10%;
    width: 60vw;
    height: 60vh;
    background: radial-gradient(ellipse at center, rgba(127, 255, 181, 0.1) 0%, rgba(16, 39, 52, 0.4) 50%, transparent 70%);
    filter: blur(100px);
    animation: aurora-drift 25s infinite alternate-reverse linear;
}

.mist-layer {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to top, var(--mist), transparent);
}

.vignette {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-shadow: inset 0 0 150px rgba(0, 0, 0, 0.8);
}

@keyframes aurora-drift {
    0% { transform: translate(0, 0) scale(1) rotate(0deg); opacity: 0.6; }
    50% { transform: translate(10%, -10%) scale(1.1) rotate(5deg); opacity: 0.9; }
    100% { transform: translate(-5%, 5%) scale(1.05) rotate(-2deg); opacity: 0.7; }
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 5%;
    z-index: 100;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header.scrolled {
    background: rgba(3, 7, 10, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 5%;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--text-primary);
}

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

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: var(--warm-accent);
    color: var(--cta-dark);
    border: none;
    box-shadow: 0 4px 15px rgba(216, 198, 163, 0.2);
}

.btn-primary:hover {
    background: #e6d3af;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(216, 198, 163, 0.3);
}

.btn-secondary {
    background: var(--glass);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    border-color: var(--aurora-green);
    background: rgba(95, 208, 140, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(95, 208, 140, 0.2);
}

/* Glass Cards */
.glass-card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 2.5rem;
    transition: var(--transition);
}

.glass-card:hover {
    border-color: rgba(95, 208, 140, 0.3);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3), inset 0 0 20px rgba(95, 208, 140, 0.05);
}

/* Sections Base */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.1rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 100px;
}

.hero-content {
    max-width: 800px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.badge {
    background: rgba(16, 39, 52, 0.6);
    border: 1px solid var(--aurora-teal);
    color: var(--aurora-bright);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero h1 span {
    background: linear-gradient(to right, var(--text-primary), var(--warm-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 650px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.hero-bullets {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bullet-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.bullet-item::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    background: var(--aurora-green);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--aurora-green);
}

/* Highlight Cards */
.highlight-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.highlight-card {
    background: rgba(16, 39, 52, 0.4);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    border-left: 2px solid var(--aurora-teal);
}

.highlight-card h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.highlight-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Phenomenon Diagram */
.science-visual {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.science-visual img {
    width: 100%;
    border-radius: var(--radius-md);
    opacity: 0.8;
}

.science-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    background: linear-gradient(to top, rgba(3, 7, 10, 0.9), transparent);
}

/* Tours */
.tour-card {
    display: flex;
    flex-direction: column;
    padding: 0;
    overflow: hidden;
}

.tour-image {
    height: 220px;
    width: 100%;
    position: relative;
}

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

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

.tour-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.tour-badges {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
}

.tour-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.tour-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.tour-details {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.tour-detail-item {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Timeline / How it works */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    height: 100%;
    width: 2px;
    background: var(--glass-border);
}

.timeline-step {
    padding-left: 60px;
    position: relative;
    margin-bottom: 3rem;
}

.timeline-step:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 11px;
    top: 5px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--aurora-green);
    box-shadow: 0 0 15px var(--aurora-green);
}

.timeline-step h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-family: var(--font-body);
}

.timeline-step p {
    color: var(--text-secondary);
}

/* Reviews */
.review-cards {
    display: flex;
    flex-wrap: nowrap;
    gap: 2rem;
    overflow-x: auto;
    padding-bottom: 2rem;
    scrollbar-width: none;
}

.review-cards::-webkit-scrollbar {
    display: none;
}

.review-card {
    min-width: 350px;
    flex: 0 0 auto;
}

.quote-icon {
    font-family: var(--font-heading);
    font-size: 4rem;
    line-height: 0.5;
    color: var(--aurora-teal);
    opacity: 0.5;
    margin-bottom: 1rem;
}

.review-text {
    font-size: 1.05rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.review-author {
    border-top: 1px solid var(--glass-border);
    padding-top: 1rem;
}

.review-author h4 {
    font-size: 1rem;
    font-family: var(--font-body);
}

.review-author span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* FAQ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    font-size: 1.1rem;
}

.faq-question:hover {
    color: var(--aurora-bright);
}

.faq-icon {
    font-size: 1.5rem;
    line-height: 1;
    color: var(--aurora-teal);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-item.active {
    border-color: var(--aurora-teal);
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    background: rgba(0, 0, 0, 0.2);
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Final CTA */
.final-cta {
    text-align: center;
    background: linear-gradient(to bottom, transparent, rgba(16, 39, 52, 0.5));
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    padding: 8rem 5%;
}

.final-cta h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.final-cta p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.final-cta-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 3rem;
}

/* Footer */
footer {
    padding: 4rem 5% 2rem;
    background: var(--bg-deep);
    border-top: 1px solid var(--glass-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-family: var(--font-body);
    font-size: 1.1rem;
}

.footer-col p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    max-width: 300px;
}

.footer-nav {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.footer-nav a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-nav a:hover {
    color: var(--aurora-bright);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Images block */
.img-block {
    width: 100%;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.img-block img {
    border-radius: var(--radius-md);
    transition: transform 0.5s ease;
}

.img-block:hover img {
    transform: scale(1.02);
}

/* Mobile Nav */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

/* Responsive */
@media (max-width: 900px) {
    .grid-2 {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links, .header-cta {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    section {
        padding: 5rem 5%;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .highlight-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-actions, .final-cta-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}