/* ============================================================
   SYNAPSE — Academic project-page design system
   KETI 지능로보틱스연구센터 · STAR TEAM
   Aesthetic ref: droid-dataset.github.io / Nerfies template
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Pretendard:wght@300;400;500;600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400;1,6..72,500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&display=swap');

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

:root {
  --white:  #ffffff;
  --bg:     #fafbfc;   /* soft section bg */
  --bg2:    #f1f3f6;
  --border: #e7e9ee;
  --border2:#d4d8e0;
  --ink:    #15181e;   /* near-black headings */
  --text:   #15181e;
  --text2:  #4b5160;   /* body */
  --text3:  #8b92a3;   /* muted / captions */

  /* restrained academic accent */
  --acc:    #4f46e5;   /* indigo */
  --acc-d:  #4338ca;
  --acc-l:  #eef1ff;
  --acc-bd: #c8cdfb;

  /* SYNAPSE component colors — used sparingly as tags/dots */
  --syn:    #4f46e5;   --syn-l:  #eef1ff;  --syn-bd: #c8cdfb;
  --tom:    #0284c7;   --tom-l:  #e2f3fd;  --tom-bd: #b6e2fb;
  --and:    #059669;   --and-l:  #d8f5e8;  --and-bd: #8ce0bd;
  --gerri:  #d97706;   --gerri-l:#fdf0d6;  --gerri-bd:#f6d68a;
  --nexus:  #dc2626;   --nexus-l:#fde4e4;  --nexus-bd:#f6acac;
  --cockpit:#7c3aed;   --cockpit-l:#efe9fe; --cockpit-bd:#cbb8fb;

  --font:  'Pretendard', 'Inter', 'Apple SD Gothic Neo', sans-serif;
  --serif: 'Newsreader', 'Pretendard', Georgia, serif;
  --mono:  'JetBrains Mono', 'Inter', ui-monospace, monospace;

  --nav-h: 62px;
  --max:   1140px;     /* page frame */
  --measure: 820px;    /* prose / reading column */
  --r: 12px;
  --r-lg: 18px;
}

html { scroll-behavior: smooth; }
body {
  background: var(--white);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.7;
  font-size: 20.5px;
  /* 한국어 어절 단위 줄바꿈 — "세부사항"이 "세/부사항"으로 끊기지 않게 */
  word-break: keep-all;
  overflow-wrap: break-word;
  line-break: strict;
  /* 마지막 줄에 한 단어만 덜렁 남지 않게(고아 방지) */
  text-wrap: pretty;
}

/* 줄바꿈 미세조정 ────────────────────────────────────
   제목·리드·캡션 등 짧은 중앙 텍스트는 줄 길이를 균형있게(balance)
   맞춰서 "네트워크 / 표준" 같이 어색한 위치 끊김을 줄인다. */
.hero-title, .hero-tagline, .hero-sub-en, .authors, .affil,
.section-title, h2.sec-title, .section-lead, .sec-desc, .eyebrow,
.figcaption, .proj-name, .proj-full, .proj-lead, .note,
.prob-title, .comp-desc, .ao-desc, .user-desc, .mtier-desc,
.cta-desc, .phase-desc, .comm-note .v, .section-head p {
  text-wrap: balance;
}

/* 쪼개지면 안 되는 어구를 통째로 묶는 유틸 */
.nb { white-space: nowrap; }

/* 문장 단위 줄바꿈 — 마침표로 끝나는 한 문장을 한 블록으로.
   문장 내부는 balance 로 균형 있게 감싸지고, 문장 사이에만 줄이 바뀐다. */
.s { display: block; }
.s + .s { margin-top: 0.22em; }

::selection { background: var(--acc-l); color: var(--acc-d); }

a { color: var(--acc); text-decoration: none; }

/* ── NAV (slim, academic) ────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 500;
  height: var(--nav-h);
  background: rgba(255,255,255,0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; padding: 0 28px;
}
.nav-logo {
  font-size: 16px; font-weight: 800; color: var(--ink);
  letter-spacing: 0.02em; margin-right: 22px;
  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
}
.nav-logo-mark {
  width: 24px; height: 24px; background: var(--ink); border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 12px; font-weight: 800;
}
.nav-links { display: flex; align-items: center; gap: 2px; list-style: none; flex: 1; }
.nav-links a {
  font-size: 14.5px; font-weight: 500; color: var(--text2);
  padding: 6px 11px; border-radius: 7px; transition: all 0.15s; white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); background: var(--bg2); }
.nav-links a.active { color: var(--acc); font-weight: 700; }
.nav-right { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.nav-gh {
  font-size: 13px; font-weight: 600; color: var(--text2);
  padding: 6px 13px; border: 1px solid var(--border2); border-radius: 8px;
  transition: all 0.15s; white-space: nowrap;
}
.nav-gh:hover { color: var(--ink); border-color: var(--ink); }
.nav-cta {
  font-size: 13px; font-weight: 700; color: white; background: var(--ink);
  padding: 7px 14px; border-radius: 8px; transition: opacity 0.15s; white-space: nowrap;
}
.nav-cta:hover { opacity: 0.85; }
.nav-hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; margin-left: auto; }
.nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; }
.mobile-menu {
  display: none; position: fixed; inset: 0; top: var(--nav-h);
  background: white; z-index: 490; flex-direction: column;
  padding: 22px 24px 48px; gap: 2px; overflow-y: auto; border-top: 1px solid var(--border);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 19px; font-weight: 600; color: var(--text2);
  padding: 14px 10px; border-bottom: 1px solid var(--border); transition: color 0.15s;
}
.mobile-menu a:hover { color: var(--ink); }

/* ── PAGE FRAME ──────────────────────────────────────── */
.container { max-width: var(--max); margin: 0 auto; padding: 0 32px; }
.measure   { max-width: var(--measure); margin-left: auto; margin-right: auto; }
.pad    { padding: 92px 0; }
.pad-sm { padding: 60px 0; }
.divider { height: 1px; background: var(--border); border: none; }

/* ── ACADEMIC HERO ───────────────────────────────────── */
.paper-hero {
  padding: calc(var(--nav-h) + 72px) 0 60px;
  text-align: center; position: relative; overflow: hidden;
}
.paper-hero-bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 50% 40% at 50% 0%, rgba(79,70,229,0.06), transparent 70%);
}
.paper-hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(21,24,30,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21,24,30,0.022) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 25%, black 10%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 25%, black 10%, transparent 75%);
}
.paper-hero > .container { position: relative; z-index: 1; }
.venue {
  font-family: var(--serif); font-style: italic;
  font-size: 18px; color: var(--text2); margin-bottom: 18px;
}
.hero-title {
  font-size: clamp(46px, 8vw, 92px); font-weight: 800;
  letter-spacing: -0.045em; line-height: 0.98; color: var(--ink);
}
.hero-title .hl { color: var(--acc); }
.hero-tagline {
  font-size: clamp(21px, 2.6vw, 29px); font-weight: 600; letter-spacing: -0.02em;
  color: var(--ink); margin: 22px auto 0; max-width: 820px; line-height: 1.42;
}
.hero-sub-en {
  font-family: var(--serif); font-size: 18px; color: var(--text3);
  margin-top: 14px; letter-spacing: 0.01em;
}
/* authors / contributors row */
.authors {
  margin: 32px auto 6px; max-width: 800px;
  font-size: 21px; color: var(--text2); line-height: 1.95;
}
.authors b { color: var(--ink); font-weight: 600; }
.authors sup { color: var(--acc); font-weight: 700; font-size: 0.72em; }
.affil {
  font-size: 16px; color: var(--text3); margin-top: 6px; line-height: 1.75;
}
.affil sup { color: var(--acc); font-weight: 700; }

/* pill button row */
.pub-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 11px; margin-top: 30px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 16px; font-weight: 600; color: #fff; background: var(--ink);
  padding: 12px 23px; border-radius: 999px; transition: transform 0.15s, background 0.15s;
  border: 1px solid var(--ink);
}
.pill:hover { transform: translateY(-2px); background: #2b2f3a; }
.pill .ic { font-size: 16px; }
.pill.ghost { background: transparent; color: var(--ink); border-color: var(--border2); }
.pill.ghost:hover { background: var(--bg2); border-color: var(--ink); }
.pill.acc { background: var(--acc); border-color: var(--acc); }
.pill.acc:hover { background: var(--acc-d); }

/* hero stat strip */
.hero-stats {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0;
  margin: 48px auto 0; max-width: 760px;
  border: 1px solid var(--border); border-radius: var(--r); overflow: hidden;
}
.hero-stat { flex: 1; min-width: 130px; padding: 20px 16px; border-right: 1px solid var(--border); }
.hero-stat:last-child { border-right: none; }
.hero-stat-num { font-size: 26px; font-weight: 800; letter-spacing: -0.03em; color: var(--ink); display: block; line-height: 1; }
.hero-stat-label { font-size: 13px; color: var(--text3); display: block; margin-top: 7px; }

/* ── SECTIONS ────────────────────────────────────────── */
.section { padding: 80px 0; }
.section.alt { background: var(--bg); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; max-width: 780px; margin: 0 auto 46px; }
.eyebrow {
  display: inline-block; font-family: var(--serif); font-style: italic;
  font-size: 18px; font-weight: 500; color: var(--acc); margin-bottom: 12px;
  letter-spacing: 0.01em;
}
.section-title, h2.sec-title {
  font-size: clamp(32px, 3.8vw, 45px); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1.18; color: var(--ink);
}
.section-lead, .sec-desc {
  font-size: 21.5px; line-height: 1.8; color: var(--text2);
  margin: 18px auto 0; max-width: 720px;
}

/* prose / reading column */
.prose { max-width: var(--measure); margin: 0 auto; }
.prose p { font-size: 21px; line-height: 1.9; color: var(--text2); margin-bottom: 19px; }
.prose p strong, .prose strong { color: var(--ink); font-weight: 700; }
.prose .lead-para { font-size: 22.5px; line-height: 1.85; color: var(--text); }

/* ── FIGURE (centered, captioned) ────────────────────── */
.figure { margin: 0 auto; max-width: 920px; }
.figure-frame {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: 32px; box-shadow: 0 1px 2px rgba(21,24,30,0.03);
}
.figcaption {
  font-family: var(--serif); font-size: 18px; color: var(--text3);
  text-align: center; margin-top: 16px; line-height: 1.65; max-width: 780px;
  margin-left: auto; margin-right: auto;
}
.figcaption b { font-style: normal; font-weight: 600; color: var(--text2); }

/* ── EYEBROW LABEL (legacy, kept) ────────────────────── */
.eyebrow::before { content: none; }

/* ── BUTTONS (legacy .btn kept for subpage footers) ──── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 15px; font-weight: 700; padding: 11px 22px; border-radius: 999px;
  transition: all 0.18s; cursor: pointer; border: 1px solid var(--ink); letter-spacing: -0.01em;
}
.btn-dark  { background: var(--ink); color: white; }
.btn-dark:hover { background: #2b2f3a; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border2); }
.btn-ghost:hover { border-color: var(--ink); background: var(--bg2); }
.btn-syn   { background: var(--acc); color: white; border-color: var(--acc); }
.btn-syn:hover { background: var(--acc-d); }
.btn-sm    { font-size: 14px; padding: 9px 18px; }

/* ── BADGES / CHIPS ──────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 700; letter-spacing: 0.04em;
  padding: 4px 11px; border-radius: 999px;
}
.badge-syn     { background: var(--syn-l);     color: var(--syn); }
.badge-tom     { background: var(--tom-l);     color: var(--tom); }
.badge-and     { background: var(--and-l);     color: var(--and); }
.badge-gerri   { background: var(--gerri-l);   color: var(--gerri); }
.badge-nexus   { background: var(--nexus-l);   color: var(--nexus); }
.badge-cockpit { background: var(--cockpit-l); color: var(--cockpit); }
.badge-gray    { background: var(--bg2); color: var(--text2); border: 1px solid var(--border); }

.chip {
  display: inline-flex; align-items: center; font-family: var(--mono);
  font-size: 13px; font-weight: 500; padding: 4px 11px; border-radius: 6px;
  background: var(--bg2); border: 1px solid var(--border); color: var(--text2);
}

/* ── CARD ────────────────────────────────────────────── */
.card    { background: var(--white); border: 1px solid var(--border); border-radius: var(--r-lg); }
.card-bg { background: var(--bg);    border: 1px solid var(--border); border-radius: var(--r-lg); }

/* ── CODE BLOCK ──────────────────────────────────────── */
.code-block { background: #1b1e26; border-radius: var(--r); overflow: hidden; border: 1px solid #2a2e39; }
.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 15px; background: #15171d; border-bottom: 1px solid rgba(255,255,255,0.05);
}
.code-dots { display: flex; gap: 6px; }
.code-dots span { width: 10px; height: 10px; border-radius: 50%; }
.code-dots span:nth-child(1) { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #febc2e; }
.code-dots span:nth-child(3) { background: #28c840; }
.code-label { font-size: 12.5px; font-weight: 500; color: rgba(255,255,255,0.34); font-family: var(--mono); }
.code-block pre {
  padding: 20px; font-family: var(--mono); font-size: 14px;
  line-height: 1.8; color: #c7cdd9; overflow-x: auto; word-break: normal;
}
.code-block code .kw  { color: #c678dd; }
.code-block code .fn  { color: #61afef; }
.code-block code .str { color: #98c379; }
.code-block code .cm  { color: #5c6370; font-style: italic; }
.code-block code .num { color: #d19a66; }
.code-block code .cn  { color: #e5c07b; }
code.inline {
  font-family: var(--mono); font-size: 0.88em; background: var(--bg2);
  padding: 2px 7px; border-radius: 5px; color: var(--acc-d); border: 1px solid var(--border);
}

/* ── TABLE ───────────────────────────────────────────── */
.tbl-wrap { border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; background: var(--white); }
.tbl { width: 100%; border-collapse: collapse; }
.tbl th {
  font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text3); padding: 13px 20px; text-align: left;
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.tbl td {
  padding: 15px 20px; border-bottom: 1px solid var(--border);
  font-size: 18px; color: var(--text2); vertical-align: top; line-height: 1.7;
}
.tbl td.mono { font-family: var(--mono); font-size: 16px; color: var(--ink); font-weight: 600; }
.tbl tbody tr:last-child td { border-bottom: none; }
.tbl tbody tr:hover td { background: var(--bg); }

/* ── NOTE / CALLOUT ──────────────────────────────────── */
.note {
  border-left: 3px solid var(--acc); background: var(--acc-l);
  padding: 17px 22px; border-radius: 0 10px 10px 0; font-size: 17.5px; line-height: 1.75; color: var(--text2);
}
.note b { color: var(--acc-d); }

/* ── FOOTER ──────────────────────────────────────────── */
.footer { background: var(--ink); color: rgba(255,255,255,0.6); padding: 56px 32px 34px; }
.footer-top {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 24px;
}
.footer-brand .logo {
  font-size: 20px; font-weight: 800; color: white; letter-spacing: 0.01em;
  display: flex; align-items: center; gap: 8px; margin-bottom: 12px;
}
.footer-brand .logo-mark {
  width: 26px; height: 26px; background: var(--acc); border-radius: 7px;
  display: flex; align-items: center; justify-content: center; color: white; font-size: 14px; font-weight: 800;
}
.footer-brand p { font-size: 15px; line-height: 1.7; color: rgba(255,255,255,0.45); }
.footer-col h4 {
  font-size: 13px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: rgba(255,255,255,0.32); margin-bottom: 14px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.footer-col a { font-size: 15px; color: rgba(255,255,255,0.5); transition: color 0.15s; }
.footer-col a:hover { color: white; }
.footer-bottom {
  max-width: var(--max); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13.5px; color: rgba(255,255,255,0.3);
}

/* ── BREADCRUMB (subpages) ───────────────────────────── */
.breadcrumb {
  padding-top: calc(var(--nav-h) + 26px);
  display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text3);
}
.breadcrumb a { color: var(--text3); }
.breadcrumb a:hover { color: var(--ink); }

/* ── PROJECT (subpage) HERO ──────────────────────────── */
.proj-hero { padding: 30px 0 44px; text-align: center; border-bottom: 1px solid var(--border); }
.proj-mark { font-size: 40px; margin-bottom: 8px; }
.proj-name { font-size: clamp(42px, 6.2vw, 72px); font-weight: 800; letter-spacing: -0.04em; line-height: 1; color: var(--ink); }
.proj-full { font-family: var(--serif); font-style: italic; font-size: 21.5px; color: var(--text3); margin-top: 12px; }
.proj-lead { font-size: 21.5px; line-height: 1.85; color: var(--text2); max-width: 700px; margin: 22px auto 0; }
.proj-badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 20px; }

/* ── UTILITIES ───────────────────────────────────────── */
.g2 { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.g3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.g4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
.center { text-align: center; }
.mt-8{margin-top:8px}.mt-12{margin-top:12px}.mt-16{margin-top:16px}.mt-20{margin-top:20px}
.mt-24{margin-top:24px}.mt-32{margin-top:32px}.mt-40{margin-top:40px}.mt-48{margin-top:48px}

/* per-page accent vars */
.page-tom     { --acc: var(--tom);     --acc-d: #036aa3; --acc-l: var(--tom-l);     --acc-bd: var(--tom-bd); }
.page-and     { --acc: var(--and);     --acc-d: #047857; --acc-l: var(--and-l);     --acc-bd: var(--and-bd); }
.page-gerri   { --acc: var(--gerri);   --acc-d: #b45309; --acc-l: var(--gerri-l);   --acc-bd: var(--gerri-bd); }
.page-nexus   { --acc: var(--nexus);   --acc-d: #b91c1c; --acc-l: var(--nexus-l);   --acc-bd: var(--nexus-bd); }
.page-cockpit { --acc: var(--cockpit); --acc-d: #6d28d9; --acc-l: var(--cockpit-l); --acc-bd: var(--cockpit-bd); }
.page-synapse { --acc: var(--syn);     --acc-d: #4338ca; --acc-l: var(--syn-l);     --acc-bd: var(--syn-bd); }

/* grid/flex 아이템은 기본 min-width:auto 라, 긴 코드 줄·모노 토큰이 열을 밀어내 페이지 전체에
   가로 스크롤을 만든다(1024px에서 synapse·gerri 실측). 축소를 허용하고 코드는 자기 스크롤로 흡수. */
.g2 > *, .g3 > *, .g4 > * { min-width: 0; }
.code-block { min-width: 0; }
code.inline { overflow-wrap: break-word; }   /* 다른 줄바꿈 기회가 없을 때만 끊는다 */

/* ── RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; }
  .g3 { grid-template-columns: 1fr 1fr; }
  .g4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --nav-h: 56px; }
  .container { padding: 0 20px; }
  .nav { padding: 0 18px; }
  .nav-links, .nav-right { display: none; }
  .nav-hamburger { display: flex; }
  .section, .pad { padding: 56px 0; }
  .pad-sm { padding: 40px 0; }
  .figure-frame { padding: 20px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .footer { padding: 40px 20px 28px; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .hero-stat { border-right: none; border-bottom: 1px solid var(--border); }
}