/* IDSX Research Lab — static site */
:root {
  --bg: #0b1220;
  --bg-soft: #121a2b;
  --card: #162033;
  --card-hover: #1b2740;
  --border: rgba(148, 163, 184, 0.18);
  --text: #e8eef9;
  --muted: #9aa8c0;
  --accent: #5b9fd4;
  --accent-2: #7dd3a7;
  --warn: #e6b35a;
  --danger: #e07a7a;
  --ok: #6bcf8e;
  --purple: #b39ddb;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0,0,0,.35);
  --max: 1080px;
  --font: "Inter", "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: radial-gradient(1200px 600px at 10% -10%, #1a2a4a 0%, transparent 50%),
              radial-gradient(900px 500px at 100% 0%, #163528 0%, transparent 40%),
              var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(11, 18, 32, 0.82);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .85rem 0; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: .65rem;
  color: var(--text); font-weight: 700; letter-spacing: .02em;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, #5b9fd4, #7dd3a7);
  display: grid; place-items: center; color: #0b1220; font-weight: 800; font-size: .85rem;
}
.nav-links { display: flex; flex-wrap: wrap; gap: .35rem .85rem; align-items: center; }
.nav-links a {
  color: var(--muted); font-size: .9rem; padding: .25rem .15rem;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); text-decoration: none; }
.nav-links a.active { border-bottom: 2px solid var(--accent); }

/* Hero */
.hero {
  padding: 3.2rem 0 2rem;
}
.hero h1 {
  font-size: clamp(1.7rem, 3.5vw, 2.45rem);
  line-height: 1.25; margin: 0 0 .9rem;
  letter-spacing: -0.02em;
}
.hero .lede {
  font-size: 1.08rem; color: var(--muted); max-width: 48rem; margin: 0 0 1.4rem;
}
.badges { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.5rem; }
.badge {
  font-size: .78rem; padding: .28rem .65rem; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted); background: rgba(255,255,255,.03);
}
.badge.ok { color: var(--ok); border-color: rgba(107,207,142,.35); }
.badge.warn { color: var(--warn); border-color: rgba(230,179,90,.35); }
.badge.info { color: var(--accent); border-color: rgba(91,159,212,.35); }
.badge.purple { color: var(--purple); border-color: rgba(179,157,219,.35); }

.actions { display: flex; flex-wrap: wrap; gap: .7rem; }
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .65rem 1.05rem; border-radius: 10px; font-weight: 600; font-size: .92rem;
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, #4f91c8, #5bb98a); color: #071018; }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }

/* Layout */
main { padding-bottom: 4rem; }
.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,.03), transparent), var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem;
  box-shadow: var(--shadow);
  transition: border-color .15s, background .15s;
}
.card:hover { border-color: rgba(91,159,212,.35); background: var(--card-hover); }
.card h3 { margin: 0 0 .45rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .94rem; }
.card .meta { margin-top: .7rem; font-size: .78rem; color: var(--accent-2); }

section.block { margin: 2.2rem 0; }
section.block h2 {
  font-size: 1.35rem; margin: 0 0 .85rem;
  padding-bottom: .45rem; border-bottom: 1px solid var(--border);
}
.prose { max-width: 48rem; }
.prose p { color: var(--muted); }
.prose strong { color: var(--text); }
.prose ul, .prose ol { color: var(--muted); padding-left: 1.2rem; }
.prose li { margin: .35rem 0; }
.prose h3 { margin-top: 1.6rem; color: var(--text); }

.callout {
  border-left: 3px solid var(--accent);
  background: rgba(91,159,212,.08);
  padding: .9rem 1rem; border-radius: 0 10px 10px 0;
  margin: 1rem 0; color: var(--text);
}
.callout.warn { border-color: var(--warn); background: rgba(230,179,90,.08); }
.callout.ok { border-color: var(--ok); background: rgba(107,207,142,.08); }
.callout.danger { border-color: var(--danger); background: rgba(224,122,122,.08); }

table {
  width: 100%; border-collapse: collapse; font-size: .88rem;
  margin: 1rem 0; overflow: hidden; border-radius: 10px;
}
th, td {
  border: 1px solid var(--border); padding: .55rem .65rem; text-align: left; vertical-align: top;
}
th { background: rgba(255,255,255,.04); color: var(--text); font-weight: 600; }
td { color: var(--muted); }
tr:hover td { background: rgba(255,255,255,.02); color: var(--text); }
code, .mono { font-family: var(--mono); font-size: .86em; color: #c5dff5; }
.tag {
  display: inline-block; font-size: .72rem; padding: .12rem .4rem; border-radius: 6px;
  margin-right: .25rem; border: 1px solid var(--border);
}
.tag.s { color: var(--accent); }
.tag.c { color: var(--warn); }
.tag.h { color: var(--purple); }

.figure {
  margin: 1.2rem 0; border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
  background: #0a0f18;
}
.figure img { width: 100%; display: block; }
.figure figcaption {
  padding: .7rem 1rem; font-size: .82rem; color: var(--muted); border-top: 1px solid var(--border);
}

.timeline { border-left: 2px solid var(--border); margin-left: .4rem; padding-left: 1.1rem; }
.timeline .item { margin: 0 0 1.1rem; position: relative; }
.timeline .item::before {
  content: ""; position: absolute; left: -1.4rem; top: .45rem;
  width: 10px; height: 10px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 3px rgba(91,159,212,.2);
}
.timeline .when { font-size: .78rem; color: var(--accent-2); }
.timeline h4 { margin: .15rem 0; }

.footer {
  border-top: 1px solid var(--border); padding: 1.5rem 0 2.5rem;
  color: var(--muted); font-size: .85rem;
}
.footer .wrap { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }

.kicker {
  text-transform: uppercase; letter-spacing: .12em; font-size: .72rem;
  color: var(--accent-2); font-weight: 700; margin-bottom: .4rem;
}

.status-grid { display: grid; gap: .75rem; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.status-pill {
  border: 1px solid var(--border); border-radius: 12px; padding: .85rem 1rem;
  background: rgba(255,255,255,.02);
}
.status-pill .n { font-size: 1.4rem; font-weight: 750; color: var(--text); }
.status-pill .l { font-size: .78rem; color: var(--muted); }

@media (max-width: 640px) {
  .nav-links { width: 100%; }
  .hero { padding-top: 2rem; }
}