:root {
    --bg-dark: #0a0e1a;
    --bg-darker: #050811;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --neon-accent: #39ff14;
    --neon-dim: rgba(57, 255, 20, 0.15);
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0 5%;
}

header.scrolled {
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
}

nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    height: var(--header-height);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1rem;
    margin-left: auto;
}

header.scrolled nav {
    height: 60px;
}

.logo {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.logo-subtitle {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 400;
    transition: color 0.3s;
    position: relative;
}

.nav-links a:hover,
.nav-links a:focus {
    color: var(--neon-accent);
    outline: none;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--neon-accent);
    transition: width 0.3s;
}

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

.nav-cta {
    padding: 0.45rem 0.9rem;
    border: 1px solid rgba(57, 255, 20, 0.4);
    border-radius: 999px;
    color: var(--text-primary);
    font-weight: 600;
    background: linear-gradient(120deg, rgba(57, 255, 20, 0.16), rgba(57, 255, 20, 0.05));
    box-shadow: 0 8px 24px rgba(57, 255, 20, 0.15);
}

.lang-toggle {
    margin-left: 1.5rem;
    padding: 0.4rem 0.9rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: transparent;
    color: var(--text-primary);
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-toggle:hover,
.lang-toggle:focus {
    border-color: var(--neon-accent);
    color: var(--neon-accent);
    outline: none;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: calc(100vh + var(--header-height));
    width: 100%;
    max-width: none;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 5%;
    padding-top: var(--header-height);
    padding-bottom: 5rem;
    overflow: hidden;
    background: var(--bg-darker);
}

.hero-visual {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    opacity: 0.85;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.hero-visual canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

.hero-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(5, 8, 17, 0.95), rgba(10, 14, 26, 0.9));
    color: var(--text-secondary);
    font-size: 0.95rem;
    letter-spacing: 0.2rem;
    text-transform: uppercase;
    z-index: 5;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.hero-loading.hidden {
    opacity: 0;
    visibility: hidden;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 1200px;
    text-align: center;
    margin: 0 auto;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
}

.hero h1 .highlight {
    color: var(--neon-accent);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
    text-align: center;
}

.hero-description {
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    color: var(--text-secondary);
    max-width: 800px;
    margin: 2rem auto;
    line-height: 1.8;
    text-align: center;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 3rem;
    flex-wrap: wrap;
    width: 100%;
}

.btn {
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--neon-accent);
    color: var(--bg-dark);
}

.btn-primary:hover,
.btn-primary:focus {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(57, 255, 20, 0.3);
    outline: none;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--text-secondary);
}

.btn-secondary:hover,
.btn-secondary:focus {
    border-color: var(--neon-accent);
    color: var(--neon-accent);
    transform: translateY(-2px);
    outline: none;
}

.product-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8rem 5% 6rem;
}

.product-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.eyebrow {
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--neon-accent);
    margin-bottom: 0.6rem;
    display: inline-block;
}

.product-header h2 {
    font-size: 2.4rem;
    letter-spacing: -0.5px;
    margin-bottom: 0.8rem;
}

.product-lead {
    color: var(--text-secondary);
    max-width: 760px;
    margin: 0 auto 1.8rem;
    line-height: 1.6;
}

.product-story {
    display: grid;
    gap: 0.6rem;
    margin: 0 auto 1.8rem;
    max-width: 720px;
    text-align: left;
}

.story-item {
    padding: 0.85rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
    line-height: 1.55;
}

.product-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.1rem;
    margin-bottom: 2.5rem;
}

.product-card {
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(57, 255, 20, 0.05));
    border-radius: 14px;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.product-card h3 {
    font-size: 1.1rem;
}

.product-card p {
    color: var(--text-secondary);
    line-height: 1.55;
}

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

.layout-block {
    padding: 1.6rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    background: rgba(5, 8, 17, 0.6);
}

.layout-block h4 {
    margin-bottom: 0.8rem;
    font-size: 1rem;
    letter-spacing: -0.2px;
}

.layout-block ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--text-secondary);
    padding-left: 0;
}

.layout-block li {
    padding-left: 1.1rem;
    position: relative;
    line-height: 1.6;
}

.layout-block li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--neon-accent);
}

/* Section Styles */
section:not(.hero):not(.product-section) {
    padding: 8rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 300;
}

.section-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 900px;
    margin-bottom: 4rem;
    line-height: 1.9;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.5rem;
    line-height: 1.9;
    color: var(--text-secondary);
}

.about-keywords {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.keyword-item {
    padding: 2rem;
    background: rgba(255, 255, 255, 0.02);
    border-left: 2px solid var(--neon-accent);
    transition: all 0.3s;
}

.keyword-item:hover {
    background: rgba(57, 255, 20, 0.05);
    transform: translateX(10px);
}

.keyword-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--neon-accent);
}

.keyword-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Philosophy Section */
.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.philosophy-card {
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.philosophy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--neon-accent);
    transform: scaleX(0);
    transition: transform 0.3s;
}

.philosophy-card:hover::before {
    transform: scaleX(1);
}

.philosophy-card:hover {
    background: rgba(57, 255, 20, 0.03);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.card-number {
    font-size: 0.85rem;
    color: var(--neon-accent);
    font-weight: 600;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.card-description {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* Lab Notes Section */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

.note-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 2.5rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s;
}

.note-card:hover {
    border-color: var(--neon-accent);
    transform: translateY(-5px);
}

.note-label {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--neon-accent);
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.note-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.note-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.note-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    opacity: 0.7;
}

/* Experiments Section */
.experiments-grid {
    display: grid;
    gap: 3rem;
    margin-top: 3rem;
}

.experiment-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 3rem;
    border-left: 3px solid var(--neon-accent);
}

.experiment-section {
    margin-bottom: 2rem;
}

.experiment-section:last-child {
    margin-bottom: 0;
}

.experiment-label {
    font-size: 0.85rem;
    color: var(--neon-accent);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.experiment-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Studio Section */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
    margin-bottom: 4rem;
}

.value-card {
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s;
}

.value-card:hover {
    background: rgba(57, 255, 20, 0.03);
    border-color: var(--neon-accent);
}

.value-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.value-subtitle {
    font-size: 0.85rem;
    color: var(--neon-accent);
    margin-bottom: 1rem;
    font-weight: 500;
}

.value-description {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

.studio-notice {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    padding: 2rem;
    background: rgba(57, 255, 20, 0.05);
    border: 1px solid var(--neon-dim);
    border-radius: 4px;
    line-height: 1.8;
}

/* Footer */
footer {
    background: var(--bg-darker);
    padding: 4rem 5%;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.footer-links a:hover,
.footer-links a:focus {
    color: var(--neon-accent);
    outline: none;
}

.copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    nav {
        gap: 0.5rem;
    }

    .logo-title {
        font-size: 1rem;
    }

    .logo-subtitle {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
        order: 1;
    }

    .logo {
        order: 2;
        flex: 1;
        align-items: center;
        text-align: center;
    }

    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 3rem 2rem;
        transition: left 0.3s;
        gap: 1.5rem;
    }

    .nav-actions {
        width: 100%;
        justify-content: space-between;
        gap: 0.5rem;
    }

    .nav-links.active {
        left: 0;
    }

    .nav-links a {
        font-size: 1.2rem;
    }

    .lang-toggle {
        margin-left: 0;
    }

    .nav-actions {
        order: 3;
        width: auto;
    }

    section {
        padding: 5rem 5%;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .philosophy-grid,
    .values-grid {
        grid-template-columns: 1fr;
    }

    .notes-grid {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }
}

/* Accessibility */
*:focus-visible {
    outline: 2px solid var(--neon-accent);
    outline-offset: 2px;
}

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

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}