:root {
    --stone-blue: #1a4a5c;
    --stone-green: #2d6b5f;
    --vermilion-red: #c73e3a;
    --earth-yellow: #c4a35a;
    --cave-beige: #f5ebe0;
    --cave-brown: #3d2914;
    --cave-dark: #2a1f14;
    --paper-texture: rgba(245, 235, 224, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--cave-beige);
    color: var(--cave-dark);
    overflow-x: hidden;
    cursor: none;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--cave-beige);
}

::-webkit-scrollbar-thumb {
    background: var(--stone-blue);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--stone-green);
}

.cursor-dot {
    position: fixed;
    width: 8px;
    height: 8px;
    background: var(--vermilion-red);
    border-radius: 50%;
    z-index: 9999;
    pointer-events: none;
    transition: transform 0.1s ease;
    mix-blend-mode: difference;
}

.cursor-ribbon {
    position: fixed;
    width: 20px;
    height: 20px;
    border: 2px solid var(--earth-yellow);
    border-radius: 50%;
    z-index: 9998;
    pointer-events: none;
    transition: all 0.15s ease;
    opacity: 0.6;
    mix-blend-mode: difference;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: linear-gradient(180deg, rgba(26, 74, 92, 0.95) 0%, rgba(26, 74, 92, 0) 100%);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(26, 74, 92, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo .logo-text {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--earth-yellow);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.navbar-menu a {
    color: var(--cave-beige);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.navbar-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--earth-yellow);
    transition: width 0.3s ease;
}

.navbar-menu a:hover::after {
    width: 100%;
}

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

.navbar-toggle span {
    width: 25px;
    height: 3px;
    background: var(--cave-beige);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.hero-section {
    position: relative;
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 110%;
    background: url('https://p3.ssl.qhimgs1.com/t04810b8dfdfbc14f3d.jpg') center/cover no-repeat;
    filter: brightness(0.7) blur(3px);
    transform: scale(1.05);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(45, 107, 95, 0.3) 0%, rgba(26, 74, 92, 0.5) 50%, rgba(61, 41, 20, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: var(--cave-beige);
    animation: fadeInUp 1.5s ease-out;
}

.hero-title-wrapper {
    margin-bottom: 3rem;
}

.hero-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 4px 4px 8px rgba(0, 0, 0, 0.5);
    letter-spacing: 0.1em;
}

.hero-subtitle {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--earth-yellow);
    letter-spacing: 0.2em;
}

.enter-btn {
    position: relative;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--cave-beige);
    background: linear-gradient(135deg, var(--stone-blue) 0%, var(--stone-green) 100%);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(26, 74, 92, 0.4);
}

.enter-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(26, 74, 92, 0.6);
}

.enter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.enter-btn:hover::before {
    left: 100%;
}

.btn-icon {
    margin-left: 0.5rem;
    transition: transform 0.3s ease;
}

.enter-btn:hover .btn-icon {
    transform: translateX(5px);
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 30px;
    height: 50px;
    border: 2px solid var(--cave-beige);
    border-radius: 25px;
    position: relative;
}

.scroll-arrow::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 15px;
    background: var(--earth-yellow);
    border-radius: 3px;
    animation: scrollDown 2s infinite;
}

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

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(10px);
    }
}

@keyframes scrollDown {
    0% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(20px);
        opacity: 0;
    }
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--stone-blue);
    position: relative;
    display: inline-block;
    margin-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--vermilion-red), var(--earth-yellow));
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--cave-brown);
    opacity: 0.8;
}

.timeline-section {
    padding: 6rem 2rem;
    background: linear-gradient(180deg, var(--cave-beige) 0%, #e8ddd0 100%);
    position: relative;
    overflow: hidden;
}

.timeline-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231a4a5c' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.timeline-container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.timeline-track {
    position: relative;
    padding: 2rem 0;
}

.timeline-line {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--stone-blue), var(--stone-green), var(--earth-yellow));
    transform: translateY(-50%);
    border-radius: 2px;
}

.timeline-items {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 1;
}

.timeline-item {
    flex: 0 0 calc(100% / 9 - 1rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.timeline-dot {
    width: 20px;
    height: 20px;
    background: var(--cave-beige);
    border: 3px solid var(--stone-blue);
    border-radius: 50%;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
}

.timeline-item:hover .timeline-dot,
.timeline-item.active .timeline-dot {
    transform: scale(1.3);
    border-color: var(--vermilion-red);
    box-shadow: 0 0 15px rgba(199, 62, 58, 0.5);
}

.timeline-content {
    margin-top: 1.5rem;
    text-align: center;
    position: relative;
}

.period-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--stone-blue);
    margin-bottom: 0.3rem;
}

.period-year {
    font-size: 0.8rem;
    color: var(--cave-brown);
    opacity: 0.7;
}

.period-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(26, 74, 92, 0.95);
    color: var(--cave-beige);
    padding: 1rem;
    border-radius: 10px;
    width: 220px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    margin-bottom: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.period-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: rgba(26, 74, 92, 0.95);
}

.timeline-item:hover .period-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-10px);
}

.period-tooltip h4 {
    font-family: 'Noto Serif SC', serif;
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--earth-yellow);
}

.period-tooltip p {
    font-size: 0.85rem;
    line-height: 1.5;
    margin-bottom: 0.3rem;
    opacity: 0.9;
}

.caves-section {
    padding: 6rem 2rem;
    background: var(--cave-dark);
    position: relative;
}

.caves-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='120' height='120' viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 60 Q45 30 60 60 Q75 90 90 60' stroke='%23c4a35a' stroke-width='1.5' fill='none' opacity='0.15'/%3E%3Cpath d='M30 60 Q45 90 60 60 Q75 30 90 60' stroke='%23c4a35a' stroke-width='1.5' fill='none' opacity='0.15'/%3E%3Ccircle cx='60' cy='60' r='8' fill='%23c4a35a' opacity='0.1'/%3E%3Ccircle cx='30' cy='30' r='5' fill='%232d6b5f' opacity='0.08'/%3E%3Ccircle cx='90' cy='90' r='5' fill='%232d6b5f' opacity='0.08'/%3E%3Cpath d='M15 15 Q20 10 25 15 Q30 20 25 25 Q20 30 15 25 Q10 20 15 15' fill='%23c73e3a' opacity='0.06'/%3E%3Cpath d='M95 95 Q100 90 105 95 Q110 100 105 105 Q100 110 95 105 Q90 100 95 95' fill='%23c73e3a' opacity='0.06'/%3E%3C/svg%3E");
    pointer-events: none;
}

.caves-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 20% 50%, rgba(45, 107, 95, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 50%, rgba(199, 62, 58, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.caves-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    position: relative;
    z-index: 1;
}

.cave-card {
    background: var(--cave-brown);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    transition: all 0.4s ease;
}

.cave-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.cave-image-wrapper {
    position: relative;
    height: 250px;
    overflow: hidden;
}

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

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

.cave-magnifier {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.cave-card:hover .cave-magnifier {
    opacity: 1;
}

.magnifier-glass {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 3px solid var(--earth-yellow);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(2px);
    pointer-events: none;
    box-shadow: 0 0 20px rgba(196, 163, 90, 0.5);
}

.cave-info {
    padding: 1.5rem;
}

.cave-number {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--earth-yellow);
    margin-bottom: 0.5rem;
}

.cave-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--cave-beige);
    margin-bottom: 0.8rem;
}

.cave-description {
    font-size: 0.9rem;
    color: rgba(245, 235, 224, 0.7);
    line-height: 1.6;
}

.about-section {
    padding: 6rem 2rem;
    background: linear-gradient(180deg, #e8ddd0 0%, var(--cave-beige) 100%);
    position: relative;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='50' cy='50' r='40' fill='none' stroke='%232d6b5f' stroke-width='0.5' stroke-opacity='0.1'/%3E%3Ccircle cx='50' cy='50' r='30' fill='none' stroke='%232d6b5f' stroke-width='0.5' stroke-opacity='0.1'/%3E%3Ccircle cx='50' cy='50' r='20' fill='none' stroke='%232d6b5f' stroke-width='0.5' stroke-opacity='0.1'/%3E%3C/svg%3E");
    pointer-events: none;
}

.about-content {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.about-text {
    text-align: center;
    margin-bottom: 4rem;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--cave-brown);
    margin-bottom: 1.5rem;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-family: 'Noto Serif SC', serif;
    font-size: 3rem;
    font-weight: 700;
    color: var(--stone-blue);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--cave-brown);
    opacity: 0.8;
}

.footer {
    background: var(--cave-dark);
    padding: 2.5rem 2rem;
    text-align: center;
}

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

.footer-text {
    color: rgba(245, 235, 224, 0.6);
    font-size: 0.95rem;
}

.section-fade-in {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease;
}

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

@media (max-width: 1024px) {
    .timeline-items {
        flex-wrap: wrap;
        gap: 2rem;
    }
    
    .timeline-item {
        flex: 0 0 calc(50% - 1rem);
    }
    
    .timeline-line {
        display: none;
    }
    
    .timeline-dot {
        width: 15px;
        height: 15px;
        border-width: 2px;
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background: rgba(26, 74, 92, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transition: left 0.3s ease;
        z-index: 999;
    }
    
    .navbar-menu.active {
        left: 0;
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .enter-btn {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .timeline-item {
        flex: 0 0 calc(33.33% - 1rem);
    }
    
    .period-title {
        font-size: 0.9rem;
    }
    
    .period-tooltip {
        width: 180px;
        padding: 0.8rem;
    }
    
    .caves-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-stats {
        gap: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
    }
    
    .navbar-logo .logo-text {
        font-size: 1.4rem;
    }
    
    .timeline-item {
        flex: 0 0 calc(50% - 0.5rem);
    }
    
    .period-title {
        font-size: 0.8rem;
    }
    
    .period-year {
        font-size: 0.7rem;
    }
}