/* DITM Lab - site styles */

:root {
  --font-sans: "Noto Sans KR", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Malgun Gothic", "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --font-display: "Poppins", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --bg: #ffffff;
  --surface: #ffffff;
  /* Secondary surface tint
     - current: white (requested)
     - restore: change to var(--surface-2-original)
  */
  --surface-2-original: #F2F6FF;
  --surface-2: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --muted-2: #64748b;
  --border: #E2E8F0;

  /* Palette tuned for #003876 */
  --brand: #003876;
  --brand-2: #1E40AF;
  --accent: #3D7BFF;

  /* Secondary (teal) for links/emphasis */
  --secondary: #0891B2;

  /* Neutral surfaces (used per-page via body_class overrides) */
  --surface-gray: #F8FAFC;
  --surface-teal: #F0F9FA;

  /* Members avatar placeholder background */
  --avatar-bg: #ffffff;

  --bg-wash:
    none;

  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 16px 48px rgba(2, 6, 23, 0.10);
  --shadow-sm: 0 10px 30px rgba(2, 6, 23, 0.08);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 8px 16px rgba(0, 0, 0, 0.10);

  --container: 1280px;
  --header-h: 72px;

  --space-1: 6px;
  --space-2: 10px;
  --space-3: 14px;
  --space-4: 18px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 44px;
  --space-8: 64px;
  --space-9: 96px;

  --ring: 0 0 0 4px rgba(61, 123, 255, 0.26);
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Keep a light, premium look even on system dark mode */
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-2-original: #F2F6FF;
    --surface-2: #ffffff;
    --text: #0f172a;
    --muted: #475569;
    --muted-2: #64748b;
    --border: rgba(15, 23, 42, 0.12);

    --bg-wash:
      none;

    --shadow: 0 16px 48px rgba(2, 6, 23, 0.10);
    --shadow-sm: 0 10px 30px rgba(2, 6, 23, 0.08);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 10px); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 1ms !important; animation-iteration-count: 1 !important; transition-duration: 1ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  background-image: var(--bg-wash);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
[data-no-save] img,
img.no-save {
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
}
a { color: inherit; }

/* Per-page background strategy */
body.publications-page { --surface-2: var(--surface-gray); }
body.gallery-page { --surface-2: var(--surface-gray); }
body.contact-page {
  background: var(--surface-teal);
  --surface-2: var(--surface-teal);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  transform: translateY(-180%);
  z-index: 9999;
}
.skip-link:focus { transform: translateY(0); outline: none; box-shadow: var(--ring); }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 18px;
}

.content-narrow {
  max-width: 920px;
  margin: 0 auto;
}

.section {
  padding: var(--space-9) 0;
}

.section--tight {
  padding: var(--space-7) 0;
}

.section--compact {
  padding: var(--space-6) 0;
}

.lead--full {
  max-width: none;
}

.page-hero--compact {
  padding: calc(var(--space-7) + 6px) 0 var(--space-5);
}

.h2--tight {
  margin: 10px 0 8px;
}

.section--alt {
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.9rem;
}

.page-label,
.section-label {
  display: inline-block;
  margin: 0 0 10px;
  color: var(--text);
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.kicker-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(61, 123, 255, 0.14);
}

.h2 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 14px 0 10px;
}

.lead {
  color: var(--muted);
  font-size: 1.06rem;
  max-width: 70ch;
  margin: 0;
}

/* About page: match intro text width to the card grid below */
.about-page .lead {
  max-width: none;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
}

@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(255, 255, 255, 0.72); }
}

/* Intentionally avoid glass/metal blur effects */

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}

.brand-sub {
  color: var(--muted-2);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.nav-toggle:focus { outline: none; box-shadow: var(--ring); }
.nav-toggle:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }

.nav {
  display: none;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 10px;
  border-radius: 12px;
  transition: background 160ms ease, color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.nav a:hover { background: var(--surface-2); color: var(--text); }
.nav a:focus { outline: none; box-shadow: var(--ring); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); box-shadow: inset 0 0 0 1px var(--border); }

.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
  z-index: 60;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  height: 100vh;
  width: min(360px, 92vw);
  background: var(--bg);
  border-left: 1px solid var(--border);
  transform: translateX(104%);
  transition: transform 200ms ease;
  z-index: 70;
  padding: 18px;
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: calc(var(--header-h) - 18px);
}

.drawer-nav {
  display: grid;
  gap: 6px;
  padding: 14px 0;
}

.drawer-nav a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 12px;
  border-radius: 14px;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 650;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.drawer-nav a span { color: var(--muted-2); font-weight: 600; }

.drawer-nav a:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); background: var(--surface-2); }
.drawer-nav a:focus { outline: none; box-shadow: var(--ring); }
.drawer-nav a[aria-current="page"] { box-shadow: inset 0 0 0 1px rgba(61, 123, 255, 0.35); }

body.nav-open { overflow: hidden; }
body.nav-open .drawer-backdrop { opacity: 1; pointer-events: auto; }
body.nav-open .drawer { transform: translateX(0); }

@media (min-width: 920px) {
  .nav-toggle { display: none; }
  .nav { display: flex; gap: 4px; align-items: center; }
  .drawer, .drawer-backdrop { display: none; }
}