/* Deep Purple Fluent Design System Variables */
:root {
    --color-bg-dark: #120A1A;       /* Very dark purple-gray (Mica base) */
    --color-bg-surface: #1C1226;    /* Dark purple for Acrylic cards */
    --color-primary: #8A2BE2;       /* Fluent deep purple accent */
    --color-primary-light: #A55EEA; /* Lighter purple accent */
    --color-accent: #B68BEC;        /* Soft purple/lilac for elegant highlights */
    --color-accent-hover: #D4B9F5;  /* Brighter lilac for hover */
    --color-text-main: #FAFAFA;     /* Clean white */
    --color-text-muted: #A59DB1;    /* Muted grey-purple */
    
    --color-glass-bg: rgba(28, 18, 38, 0.65); /* Acrylic backdrop */
    --color-glass-border: rgba(255, 255, 255, 0.08); /* Fluent subtle border */
    
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-korean: 'Noto Serif KR', serif;

    --radius-card: 12px;
    --radius-btn: 6px;
    --shadow-flyout: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.25);

    --transition-smooth: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1);
    --transition-slow: all 0.6s cubic-bezier(0.2, 0.9, 0.4, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 15px;
}

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

/* Typography Customization for Korean/English mixed */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--color-text-main);
}
h1:lang(ko), h2:lang(ko), h3:lang(ko), h4:lang(ko), h5:lang(ko), h6:lang(ko) {
    font-family: var(--font-korean);
    font-weight: 600;
}

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

p {
    font-family: var(--font-body);
    font-weight: 300;
}
p:lang(ko) {
    font-family: var(--font-korean);
    font-weight: 300;
}

.text-large {
    font-size: 1.5rem;
    color: var(--color-accent);
    font-style: italic;
    margin-bottom: 1.5rem;
}

/* Ambient Glowing Background Animations */
.ambient-background {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: floatGlow 15s infinite alternate ease-in-out;
}

.glow-1 {
    width: 600px; height: 600px;
    background: radial-gradient(circle, #3B1C6D, transparent 70%);
    top: -10%; left: -10%;
    animation-delay: 0s;
}

.glow-2 {
    width: 800px; height: 800px;
    background: radial-gradient(circle, #250D47, transparent 70%);
    bottom: -20%; right: -10%;
    animation-delay: -5s;
    animation-duration: 20s;
}

.glow-3 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(212,175,55,0.1), transparent 70%);
    top: 40%; left: 30%;
    animation-delay: -10s;
    animation-duration: 25s;
}

@keyframes floatGlow {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, 50px) scale(1.1); }
}

/* Reusable Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 8rem 0;
    position: relative;
}

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

.section-label {
    color: var(--color-accent);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 1rem;
    font-family: var(--font-body);
}

.section-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

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

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: var(--radius-btn);
    font-family: var(--font-body);
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-main);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.btn-primary:hover {
    background-color: var(--color-primary-light);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-main);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.4);
}

.full-width { width: 100%; text-align: center; }

/* Acrylic / Mica Classes */
.glass-panel, .glass-card {
    background: var(--color-glass-bg);
    backdrop-filter: blur(24px) saturate(120%);
    -webkit-backdrop-filter: blur(24px) saturate(120%);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-card);
    transition: var(--transition-smooth);
}

.glass-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-flyout);
}

/* Image Placeholders */
.image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #170A2A, #250D47);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    text-align: center;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    padding: 1.5rem 0;
    z-index: 100;
    transition: transform 0.4s ease, opacity 0.4s ease, background 0.3s, padding 0.3s;
    border-bottom: 1px solid transparent;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

.navbar.visible {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
}

.navbar.scrolled {
    background: rgba(11, 5, 21, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-glass-border);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--color-text-main);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Currency Toggle */
.currency-toggle {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.currency-toggle span {
    transition: var(--transition-smooth);
}

.currency-toggle span.active {
    color: var(--color-accent);
    font-weight: 500;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 1px;
    background: var(--color-text-main);
    transition: var(--transition-smooth);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 2rem;
    position: relative;
    background: url('assets/hero-bg.png') no-repeat center center;
    background-size: cover;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    /* Subtle fade over the image, fading to the dark bg at the bottom */
    background: linear-gradient(to bottom, rgba(11,5,21,0.3) 0%, rgba(11,5,21,0.6) 70%, var(--color-bg-dark) 100%);
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-subtitle {
    color: var(--color-accent);
    font-size: 1.2rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    font-family: var(--font-body);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 0.5s forwards;
}

.hero-title {
    font-size: 8rem;
    line-height: 1;
    margin-bottom: 2rem;
    letter-spacing: 12px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 0.8s forwards;
    background: linear-gradient(to right, #F4F0F9, #A396B4);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    max-width: 600px;
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 1.1s forwards;
    color: var(--color-text-muted);
}

.hero .btn-primary {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 1.4s forwards;
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    animation: fadeIn 1s ease 2s forwards;
    z-index: 2;
}

.mouse {
    width: 24px;
    height: 36px;
    border: 1px solid var(--color-text-muted);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}

.wheel {
    width: 4px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 2px;
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

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

@keyframes fadeIn {
    to { opacity: 1; }
}

/* Profile Section */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.profile-glass {
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    aspect-ratio: 3/4;
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
}

/* Messages Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.message-card {
    padding: 3rem 2rem;
}

.card-date {
    font-family: var(--font-body);
    color: var(--color-accent);
    font-size: 0.85rem;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.card-excerpt {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

.read-more {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
    font-weight: 500;
}

.read-more:hover {
    color: var(--color-text-main);
    letter-spacing: 2px;
}

/* Art Collection Layout */
.flex-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 4rem;
}

.view-all-link {
    color: var(--color-accent);
    font-size: 0.9rem;
    letter-spacing: 1px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 4px;
    text-transform: uppercase;
}

.view-all-link:hover {
    border-color: var(--color-accent);
    color: var(--color-text-main);
}

.art-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.art-card {
    display: flex;
    flex-direction: column;
}

.art-image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 3/4;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border-radius: 4px;
}

.art-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

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

.art-overlay {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(18, 10, 26, 0.9), transparent);
    display: flex;
    justify-content: center;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-smooth);
}

.art-card:hover .art-overlay {
    opacity: 1;
    transform: translateY(0);
}

.btn-art-action {
    width: 100%;
    padding: 1rem;
    background: rgba(138, 43, 226, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-btn);
    color: var(--color-text-main);
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    backdrop-filter: blur(8px);
    transition: var(--transition-smooth);
}

.btn-art-action:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--color-accent);
}

.art-meta-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
    font-size: 0.75rem;
    letter-spacing: 1.5px;
}

.art-category {
    color: var(--color-accent);
    text-transform: uppercase;
    font-weight: 500;
}

.art-date {
    color: var(--color-text-muted);
}

.art-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.art-desc {
    color: var(--color-text-main);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Services */
.service-card {
    padding: 3rem;
    display: flex;
    flex-direction: column;
}

.service-card.featured {
    border-color: var(--color-accent);
    position: relative;
}

.service-badge {
    position: absolute;
    top: -15px;
    right: 2rem;
    background: var(--color-accent);
    color: var(--color-bg-dark);
    padding: 0.3rem 1rem;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.service-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.card-description {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    flex-grow: 1;
}

.service-features {
    list-style: none;
    margin-bottom: 2.5rem;
}

.service-features li {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--color-text-main);
    display: flex;
    align-items: center;
}

.service-features li::before {
    content: "✦";
    color: var(--color-accent);
    margin-right: 10px;
    font-size: 0.8rem;
}

.service-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--color-glass-border);
    padding-top: 1.5rem;
}

.price-tag {
    font-size: 1.8rem;
    font-family: var(--font-heading);
    color: var(--color-accent);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(11, 5, 21, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    padding: 3rem;
    max-width: 500px;
    width: 90%;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 1.5rem; right: 2rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: var(--transition-smooth);
}

.close-modal:hover {
    color: var(--color-text-main);
}

.modal-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.modal-product {
    color: var(--color-accent);
    margin-bottom: 2rem;
    font-size: 1.2rem;
}

.payment-options {
    margin-bottom: 2rem;
}

.payment-option {
    margin-bottom: 1rem;
    padding: 1rem;
    border: 1px solid var(--color-glass-border);
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.payment-option:hover {
    background: rgba(255,255,255,0.05);
}

/* Fullscreen Intro */
#chapter-intro {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
#chapter-intro .chapter-content {
    margin: auto;
}

/* Footer */
footer {
    background: #080310;
    padding: 6rem 0 3rem;
    border-top: 1px solid var(--color-glass-border);
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    gap: 4rem;
    justify-content: space-between;
}

.footer-brand h2 {
    font-size: 2rem;
    letter-spacing: 5px;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--color-text-muted);
    max-width: 300px;
}

.footer-links {
    display: flex;
    gap: 4rem;
}

.link-group h4 {
    color: var(--color-text-main);
    font-family: var(--font-body);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.link-group a {
    display: block;
    color: var(--color-text-muted);
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
}

.link-group a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    width: 100%;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    text-align: center;
    color: rgba(255,255,255,0.3);
    font-size: 0.8rem;
}

/* Reveal Animations on Scroll */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

/* Responsive */
@media (max-width: 992px) {
    .split-layout {
        grid-template-columns: 1fr;
    }
    .hero-title { font-size: 6rem; }
    .art-cards { grid-template-columns: repeat(2, 1fr); }
    .flex-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* In a real app, implement mobile menu */
    }
    .hamburger { display: flex; }
    .hero-title { font-size: 4rem; }
    .art-cards { grid-template-columns: 1fr; }
    .footer-links { flex-direction: column; gap: 2rem; }
}

/* Scrollytelling & 3D WebGL Layers */
#webgl-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    z-index: -1;
    pointer-events: none;
    background: var(--color-bg-dark); /* Fallback */
}

.story-container {
    position: relative;
    z-index: 10;
}

.chapter {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 6rem 2rem;
    position: relative;
    overflow: hidden;
}

.chapter.align-center {
    align-items: center;
}

.chapter.align-split {
    align-items: center;
}

.chapter-content {
    max-width: 1200px;
    width: 100%;
}

.chapter-content.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

/* Ensure no visual layout janks before GSAP initializes */
.gsap-fade-up, .gsap-fade-left, .gsap-fade-right {
    opacity: 0;
    visibility: hidden;
}

@media (max-width: 992px) {
    .chapter-content.split-layout {
        grid-template-columns: 1fr;
        direction: ltr !important; /* Reset direction */
        text-align: center;
    }
    .chapter-content.split-layout > div {
        direction: ltr !important;
    }
    .chapter {
        padding: 4rem 1.5rem;
    }
}