:root {
    --bg: #0b1222;
    --bg-elevated: #0f1a30;
    --bg-card: #142038;
    --bg-card-hover: #1a2a45;
    --accent: #4f7df5;
    --accent-dim: rgba(79, 125, 245, 0.08);
    --accent-glow: rgba(79, 125, 245, 0.15);
    --text: #e8e8ed;
    --text-secondary: rgba(232, 232, 237, 0.55);
    --text-muted: rgba(232, 232, 237, 0.3);
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', 'Noto Sans KR', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    word-break: keep-all;
    -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: white; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 40px; }

/* ============ NAV ============ */
nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 24px 60px;
    display: flex; align-items: center; justify-content: space-between;
    transition: all 0.5s ease;
}
nav.scrolled {
    padding: 24px 60px;
    background: rgba(11, 18, 34, 0.92);
    backdrop-filter: blur(24px) saturate(1.2);
    border-bottom: 1px solid var(--border);
}
.logo {
    display: flex; align-items: center;
    text-decoration: none; transition: opacity 0.3s;
}
.logo:hover { opacity: 0.8; }
.logo img { height: 32px; width: auto; filter: brightness(1.1); }

.nav-links { display: flex; gap: 44px; list-style: none; }
.nav-links a {
    text-decoration: none; font-size: 0.8rem; font-weight: 500;
    letter-spacing: 2px; text-transform: uppercase;
    color: var(--text-secondary); transition: color var(--transition);
    position: relative;
}
.nav-links a::after {
    content: ''; position: absolute;
    bottom: -6px; left: 50%; width: 0; height: 1px;
    background: var(--accent); transition: all var(--transition);
    transform: translateX(-50%);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

/* Mobile */
.menu-toggle {
    display: none; background: none; border: none;
    cursor: pointer; padding: 8px; z-index: 1001;
}
.menu-toggle span {
    display: block; width: 22px; height: 1.5px;
    background: var(--text-secondary); margin: 5px 0;
    transition: all 0.3s;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

.mobile-nav {
    display: none; position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(11, 18, 34, 0.98);
    backdrop-filter: blur(40px);
    z-index: 999;
    flex-direction: column; align-items: center; justify-content: center; gap: 36px;
}
.mobile-nav.active { display: flex; }
.mobile-nav a {
    color: var(--text-secondary); text-decoration: none;
    font-size: 1.1rem; font-weight: 400;
    letter-spacing: 3px; text-transform: uppercase;
    transition: color 0.3s;
}
.mobile-nav a:hover { color: var(--text); }

/* ============ HERO ============ */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    position: relative; overflow: hidden;
}
.hero-bg {
    position: absolute; inset: -10%;
    background: url('../images/hero-main.png') center/cover no-repeat;
    opacity: 0.7;
    animation: heroZoom 30s ease-in-out infinite alternate;
}
@keyframes heroZoom {
    0% { transform: scale(1); }
    100% { transform: scale(1.06); }
}
.hero-overlay {
    position: absolute; inset: 0;
    background:
        
        linear-gradient(180deg, rgba(11,18,34,0.1) 0%, rgba(11,18,34,0.5) 100%);
}
.hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 80px 80px;
    opacity: 0.3;
    animation: gridFade 4s ease-in-out infinite alternate;
}
@keyframes gridFade { 0% { opacity: 0.15; } 100% { opacity: 0.35; } }

.hero-content {
    position: relative; z-index: 1;
    text-align: center; max-width: 800px; padding: 0 40px;
}
.hero-tag {
    display: inline-block;
    font-size: 0.7rem; font-weight: 500;
    letter-spacing: 4px; text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 32px;
    opacity: 0; animation: fadeUp 1s 0.3s forwards;
}
.hero h1 {
    font-family: 'Inter', sans-serif;
    font-size: clamp(2.4rem, 5.5vw, 4rem);
    font-weight: 700; line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 20px;
    opacity: 0; animation: fadeUp 1s 0.5s forwards;
}
.hero-sub {
    font-size: 1.05rem; color: var(--text-secondary);
    font-weight: 300; line-height: 1.8;
    margin-bottom: 48px;
    opacity: 0; animation: fadeUp 1s 0.7s forwards;
}
.hero-sub em {
    font-style: normal; color: var(--text);
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
}

.hero-cta {
    display: inline-flex; align-items: center; gap: 12px;
    padding: 14px 36px;
    border: 1px solid var(--border-hover);
    border-radius: 100px;
    color: var(--text-secondary);
    text-decoration: none; font-size: 0.8rem; font-weight: 500;
    letter-spacing: 1.5px; text-transform: uppercase;
    transition: all var(--transition);
    opacity: 0; animation: fadeUp 1s 0.9s forwards;
}
.hero-cta svg { width: 16px; height: 16px; transition: transform 0.3s; }
.hero-cta:hover {
    color: var(--text); border-color: var(--accent);
    background: var(--accent-dim);
}
.hero-cta:hover svg { transform: translateX(4px); }

.hero-scroll {
    position: absolute; bottom: 40px; left: 50%;
    transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 12px;
    color: var(--text-muted); font-size: 0.65rem;
    letter-spacing: 3px; text-transform: uppercase;
    opacity: 0; animation: fadeUp 1s 1.2s forwards;
}
.hero-scroll .line {
    width: 1px; height: 48px; background: var(--border-hover);
    position: relative; overflow: hidden;
}
.hero-scroll .line::after {
    content: ''; position: absolute;
    top: -100%; left: 0; width: 100%; height: 50%;
    background: var(--accent);
    animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
    0% { top: -50%; } 100% { top: 100%; }
}

/* ============ SECTIONS ============ */
section { padding: 140px 60px; position: relative; }

.section-label {
    font-size: 0.7rem; font-weight: 500;
    letter-spacing: 4px; text-transform: uppercase;
    color: var(--accent); margin-bottom: 16px;
}
.section-title {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 600; line-height: 1.4;
    letter-spacing: -0.5px; margin-bottom: 20px;
    color: var(--text);
}
.section-desc {
    font-size: 0.95rem; color: var(--text-secondary);
    line-height: 1.8; max-width: 520px;
}

/* About Preview */
.about-preview {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 80px; align-items: center;
}
.about-image { position: relative; border-radius: var(--radius-lg); overflow: hidden; }
.about-image img {
    width: 100%; display: block;
    filter: brightness(0.85) saturate(0.9);
    transition: all 0.6s;
}
.about-image:hover img { filter: brightness(0.95) saturate(1); transform: scale(1.02); }
.about-image::after {
    content: ''; position: absolute; inset: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

/* Business Grid */
.biz-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 1px; margin-top: 60px;
    background: var(--border); border-radius: var(--radius);
    overflow: hidden;
}
.biz-item {
    padding: 48px 32px;
    background: var(--bg-card);
    transition: all var(--transition);
}
.biz-item:hover { background: var(--bg-card-hover); }
.biz-item h4 {
    font-size: 0.95rem; font-weight: 600;
    margin-bottom: 12px; color: var(--text);
    letter-spacing: -0.2px;
}
.biz-item p {
    font-size: 0.85rem; color: var(--text-secondary);
    line-height: 1.7;
}

/* Contact Bar */
.contact-bar {
    background: var(--bg-elevated);
    text-align: center;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.contact-bar h2 {
    font-size: 1.4rem; font-weight: 500;
    color: var(--text-secondary); margin-bottom: 16px;
    letter-spacing: -0.3px;
}
.contact-bar a {
    color: var(--text); text-decoration: none;
    font-size: 1.1rem; font-weight: 400;
    border-bottom: 1px solid var(--border-hover);
    padding-bottom: 4px;
    transition: all 0.3s;
}
.contact-bar a:hover { color: var(--accent); border-color: var(--accent); }

/* ============ PAGE HERO (Sub pages) ============ */
.page-hero {
    padding: 160px 60px 80px;
    text-align: center;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}
.page-label {
    font-size: 0.7rem; font-weight: 500;
    letter-spacing: 4px; text-transform: uppercase;
    color: var(--accent); margin-bottom: 20px;
}
.page-hero h1 {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 600; line-height: 1.3;
    letter-spacing: -0.5px; margin-bottom: 16px;
}
.page-hero p {
    font-size: 0.95rem; color: var(--text-secondary); line-height: 1.8;
}

/* About Page */
.brand-story {
    padding: 60px; background: var(--bg-card);
    border: 1px solid var(--border); border-radius: var(--radius-lg);
    margin-bottom: 80px;
}
.brand-story h3 {
    font-size: 0.95rem; font-weight: 600; margin-bottom: 20px;
    color: var(--text);
}
.brand-story p { font-size: 0.9rem; color: var(--text-secondary); line-height: 2; }

.values-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 24px; margin-bottom: 80px;
}
.value-card {
    padding: 40px 32px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.value-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}
.value-icon {
    width: 44px; height: 44px; margin-bottom: 24px;
}
.value-icon svg {
    width: 100%; height: 100%;
    stroke: var(--accent);
}
.value-card h4 {
    font-size: 0.95rem; font-weight: 600;
    margin-bottom: 12px; letter-spacing: -0.2px;
}
.value-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }

.history { margin-bottom: 80px; }
.history h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 32px; }
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
    content: ''; position: absolute;
    left: 0; top: 0; bottom: 0; width: 1px;
    background: var(--border);
}
.timeline-item {
    display: flex; gap: 24px; padding: 16px 0;
    position: relative;
}
.timeline-item::before {
    content: ''; position: absolute;
    left: -36px; top: 22px;
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--bg); border: 1.5px solid var(--accent);
}
.year {
    font-family: 'Inter', monospace;
    font-size: 0.85rem; font-weight: 600;
    color: var(--accent); min-width: 48px;
}
.desc { font-size: 0.85rem; color: var(--text-secondary); }

.operation {
    padding: 60px; background: var(--bg-card);
    border: 1px solid var(--border); border-radius: var(--radius-lg);
}
.operation h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 20px; }
.operation p { font-size: 0.9rem; color: var(--text-secondary); line-height: 2; }

/* Tech Page */
.tech-section {
    padding: 100px 60px; position: relative;
    background: var(--bg);
}
.tech-grid {
    display: grid; grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.tech-card {
    padding: 48px 40px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
    overflow: hidden;
}
.tech-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}
.tech-card-img {
    border-radius: var(--radius); overflow: hidden;
    margin-bottom: 28px;
}
.tech-card-img img {
    width: 100%; height: 200px; object-fit: cover;
    display: block;
    filter: brightness(0.8) saturate(0.8);
    transition: all 0.6s;
}
.tech-card:hover .tech-card-img img {
    filter: brightness(0.9) saturate(1);
    transform: scale(1.03);
}
.tech-card h3 {
    font-size: 1rem; font-weight: 600;
    margin-bottom: 12px; letter-spacing: -0.2px;
}
.tech-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.8; }

/* Contact Page */
.contact-grid {
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 80px; align-items: center;
}
.contact-info { display: flex; flex-direction: column; gap: 40px; }
.contact-item {
    display: flex; align-items: flex-start; gap: 20px;
}
.contact-item .icon {
    width: 40px; height: 40px; min-width: 40px;
    display: flex; align-items: center; justify-content: center;
    border: 1px solid var(--border); border-radius: 10px;
    background: var(--bg-card);
}
.contact-item .icon svg {
    width: 20px; height: 20px; stroke: var(--accent);
}
.contact-item h4 {
    font-size: 0.8rem; font-weight: 600;
    letter-spacing: 1px; text-transform: uppercase;
    color: var(--text-muted); margin-bottom: 4px;
}
.contact-item a, .contact-item p {
    color: var(--text); text-decoration: none;
    font-size: 0.95rem;
}
.contact-item a:hover { color: var(--accent); }
.contact-visual { border-radius: var(--radius-lg); overflow: hidden; }
.contact-visual img {
    width: 100%; display: block;
    filter: brightness(0.8) saturate(0.85);
}

/* ============ FOOTER ============ */
footer {
    display: flex; justify-content: space-between; align-items: center;
    padding: 32px 60px;
    border-top: 1px solid var(--border);
    color: var(--text-muted); font-size: 0.75rem;
    letter-spacing: 0.5px;
}
.footer-tagline {
    font-size: 0.7rem; letter-spacing: 2px;
    text-transform: uppercase; color: var(--text-muted);
}

/* ============ ANIMATIONS ============ */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}
.reveal {
    opacity: 0; transform: translateY(32px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* Number counter */
.counter { position: relative; }
.counter::after {
    content: ''; position: absolute;
    bottom: -8px; left: 0; width: 24px; height: 1px;
    background: var(--accent);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
    .biz-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    nav { padding: 16px 24px; }
    nav.scrolled { padding: 12px 24px; }
    .nav-links { display: none; }
    .menu-toggle { display: block; color: var(--text-secondary); }
    section { padding: 100px 24px; }
    .page-hero { padding: 120px 24px 60px; }
    .container { padding: 0 24px; }
    text-align: center;
    .about-preview { grid-template-columns: 1fr; gap: 48px; }
    .values-grid { grid-template-columns: 1fr; }
    .biz-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .brand-story, .operation { padding: 36px 28px; }
    footer {
        flex-direction: column; gap: 8px;
        text-align: center; padding: 28px 24px;
    }
    .hero-content { padding: 0 24px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 2rem; }
    .page-hero h1 { font-size: 1.6rem; }
    .section-title { font-size: 1.4rem; }
}