/* =============================================
   Shared site styles (header / nav / footer / partners marquee / base)
   페이지마다 inline으로 복붙하지 않도록 한 곳에 모아둔 파일.
   페이지 고유 스타일(hero, mission, apps, journey, contact 등)은 각 페이지 inline에 유지.
   ============================================= */

:root {
    --bg: #ffffff;
    --bg-soft: #fafafa;
    --bg-dark: #0a0a0a;
    --text: #0a0a0a;
    --text-muted: #6b7280;
    --text-faint: #9ca3af;
    --border: #e5e7eb;
    --accent: #00b8d4;
    --accent-2: #0066ff;
    --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.04);
    --radius: 14px;
    --max: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container {
    width: 100%;
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
header.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(255,255,255,0.85);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .2s ease;
}
header.site-header.scrolled { border-bottom-color: var(--border); }
header.site-header nav {
    max-width: var(--max);
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo .dot {
    width: 8px; height: 8px;
    background: var(--accent);
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}
.logo .stack {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.logo .stack .ko {
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0;
    margin-top: 2px;
}
.foot-brand .logo .stack .ko { color: #9ca3af; }
.nav-links {
    display: flex;
    gap: 32px;
    font-size: .95rem;
    font-weight: 500;
    color: var(--text-muted);
}
.nav-links a { transition: color .15s ease; }
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); font-weight: 600; }
.nav-cta {
    padding: 8px 18px;
    border: 1px solid var(--text);
    border-radius: 999px;
    color: var(--text);
    font-weight: 600;
    font-size: .9rem;
    transition: all .15s ease;
}
.nav-cta:hover { background: var(--text); color: #fff; }

/* Hamburger (mobile only) */
.nav-toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    width: 40px;
    height: 40px;
    padding: 0;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: border-color .15s ease;
}
.nav-toggle:hover { border-color: var(--text); }
.nav-toggle .bars,
.nav-toggle .bars::before,
.nav-toggle .bars::after {
    content: "";
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform .25s ease, opacity .15s ease, top .25s ease;
    position: relative;
}
.nav-toggle .bars::before { position: absolute; top: -6px; left: 0; }
.nav-toggle .bars::after  { position: absolute; top:  6px; left: 0; }
.nav-toggle.open .bars { background: transparent; }
.nav-toggle.open .bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open .bars::after  { top: 0; transform: rotate(-45deg); }

/* Mobile slide menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 73px; /* below sticky header */
    left: 0; right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 24px;
    z-index: 99;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s ease, transform .25s ease;
}
.mobile-menu.open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
}
.mobile-menu a {
    display: block;
    padding: 14px 8px;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a.active { color: var(--accent); }

@media (max-width: 720px) {
    .nav-links { display: none; }
    .nav-cta   { display: none; }
    .nav-toggle { display: inline-flex; }
    .mobile-menu { display: block; }
}
@media (min-width: 721px) {
    .mobile-menu { display: none !important; }
}

/* ===== Partners marquee ===== */
.partners {
    padding: 64px 0 56px;
    background: var(--bg-soft);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}
.partners-head {
    text-align: center;
    margin-bottom: 32px;
}
.partners-head .label {
    color: var(--text-muted);
    font-size: .82rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.marquee {
    position: relative;
    overflow: hidden;
    mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track {
    display: flex;
    gap: 24px;
    width: max-content;
    animation: marquee 38s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}
.partner {
    flex-shrink: 0;
    height: 72px;
    padding: 0 22px 0 14px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--text);
    font-size: .96rem;
    white-space: nowrap;
    transition: all .18s ease;
}
.partner:hover {
    border-color: var(--text);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.partner-mark {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: .68rem;
    letter-spacing: 0.02em;
    flex-shrink: 0;
    line-height: 1;
}
.partner img.partner-logo {
    width: 44px;
    height: 44px;
    object-fit: contain;
    border-radius: 8px;
    flex-shrink: 0;
}
@media (prefers-reduced-motion: reduce) {
    .marquee-track { animation: none; }
}

/* ===== Footer ===== */
footer.site {
    background: var(--bg-dark);
    color: #cbd5e1;
    padding: 72px 0 40px;
}
.foot-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 56px;
    border-bottom: 1px solid #1f2937;
}
@media (max-width: 720px) {
    .foot-grid { grid-template-columns: 1fr 1fr; }
}
.foot-brand .logo { color: #fff; margin-bottom: 14px; }
.foot-brand p { color: #9ca3af; font-size: .92rem; max-width: 320px; }
.foot-col h5 {
    color: #fff;
    font-size: .85rem;
    font-weight: 700;
    margin-bottom: 18px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}
.foot-col a {
    display: block;
    color: #9ca3af;
    font-size: .92rem;
    padding: 4px 0;
    transition: color .15s ease;
}
.foot-col a:hover { color: #fff; }
.foot-corp {
    padding: 28px 0 24px;
    color: #6b7280;
    font-size: .85rem;
    line-height: 1.85;
    border-bottom: 1px solid #1f2937;
}
.foot-corp p { margin: 0; }
.foot-corp strong { color: #cbd5e1; font-weight: 700; }
.foot-corp .lbl {
    color: #cbd5e1;
    font-weight: 600;
    margin-right: 6px;
}
.foot-corp a {
    color: #9ca3af;
    border-bottom: 1px dotted #374151;
    transition: color .15s ease, border-color .15s ease;
}
.foot-corp a:hover {
    color: #fff;
    border-color: #fff;
}

.foot-bottom {
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    color: #6b7280;
    font-size: .85rem;
}

/* ===== Reveal animation ===== */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity .7s ease, transform .7s ease;
}
.reveal.in {
    opacity: 1;
    transform: none;
}