/* ============================================================
   SCI-KNOWLEDGEHUB — 방출선 성도(Emission-line Star Chart)
   Tistory > 스킨 편집 > [CSS] 탭
   ============================================================ */

:root{
  /* 심우주 */
  --void:#04060e;
  --void-2:#0a1020;
  --ink:#e9eef8;
  --muted:#7f8da8;
  --line:rgba(255,255,255,.09);
  --panel:rgba(10,16,32,.72);

  /* 원소 방출선 — 각 은하의 색은 실제 파장에서 가져왔습니다 */
  --fe:#6b74ff;   /* 철      438.4 nm */
  --ti:#2fd3c9;   /* 티타늄  498.2 nm */
  --c :#4ade80;   /* 탄소    516.5 nm */
  --na:#ffd60a;   /* 나트륨  589.0 nm */
  --h :#ff4d63;   /* 수소    656.3 nm */

  --serif:'Gowun Batang',serif;
  --sans:'Pretendard',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;

  --head-h:64px;
  --spec-h:58px;
}

*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--void);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

:focus-visible{outline:2px solid #9fd0ff;outline-offset:3px;border-radius:4px}

/* ── 배경 ─────────────────────────────────────────── */
#starfield{position:fixed;inset:0;width:100%;height:100%;z-index:-2;display:block}
#nebula{
  position:fixed;inset:-20%;z-index:-3;pointer-events:none;
  background:
    radial-gradient(38% 30% at 22% 26%,rgba(107,116,255,.18),transparent 70%),
    radial-gradient(32% 26% at 78% 64%,rgba(255,77,99,.14),transparent 70%),
    radial-gradient(46% 40% at 52% 92%,rgba(47,211,201,.10),transparent 70%),
    linear-gradient(180deg,var(--void) 0%,var(--void-2) 62%,var(--void) 100%);
  filter:blur(4px);
}

/* ── 헤더 ─────────────────────────────────────────── */
.site-head{
  position:fixed;top:0;left:0;right:0;height:var(--head-h);z-index:40;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(16px,3vw,36px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(4,6,14,.86),rgba(4,6,14,.28));
}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{
  width:22px;height:22px;border-radius:50%;
  background:radial-gradient(circle at 32% 30%,#fff,var(--na) 38%,var(--h) 72%,transparent 74%);
  box-shadow:0 0 18px rgba(255,214,10,.45);
}
.brand-text b{font-family:var(--serif);font-size:19px;letter-spacing:.02em;font-weight:400;display:block}
.brand-text em{font-family:var(--mono);font-style:normal;font-size:10.5px;letter-spacing:.22em;color:var(--muted);display:block}

.head-tools{display:flex;align-items:center;gap:10px}
.tool,.tool-search input{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;
  background:transparent;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;
  padding:7px 14px;cursor:pointer;transition:.2s;
}
.tool:hover,.tool[aria-pressed="true"]{color:var(--ink);border-color:rgba(255,255,255,.3)}
.tool-search input{width:170px;cursor:text}
.tool-search input::placeholder{color:#54607a}

/* ── 은하 지도 ────────────────────────────────────── */
.atlas{
  position:relative;
  height:100dvh;min-height:560px;
  padding-top:var(--head-h);padding-bottom:var(--spec-h);
}
.galaxy-layer,.orbit-layer{position:absolute;inset:var(--head-h) 0 var(--spec-h) 0}
.orbit-layer[hidden]{display:none}

/* 은하 노드 */
.galaxy{
  position:absolute;transform:translate(-50%,-50%);
  display:flex;flex-direction:column;align-items:center;gap:10px;
  background:none;border:0;padding:0;cursor:pointer;color:inherit;
  transition:opacity .45s ease,transform .45s cubic-bezier(.2,.7,.3,1);
}
.galaxy-core{
  position:relative;width:var(--size,86px);height:var(--size,86px);border-radius:50%;
  background:radial-gradient(circle at 36% 32%,#fff 0%,var(--hue) 34%,transparent 72%);
  box-shadow:0 0 34px -4px var(--hue),inset 0 0 22px -6px rgba(255,255,255,.6);
}
.galaxy-core::after{               /* 강착 원반 */
  content:'';position:absolute;inset:-26%;
  border:1px solid var(--hue);opacity:.42;border-radius:50%;
  transform:rotateX(72deg);
  animation:spin 26s linear infinite;
}
.galaxy-label{text-align:center}
.galaxy-label b{font-family:var(--serif);font-weight:400;font-size:16px;display:block;letter-spacing:.02em}
.galaxy-label span{font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:var(--muted);display:block;margin-top:2px}
.galaxy:hover .galaxy-core,.galaxy:focus-visible .galaxy-core{box-shadow:0 0 60px -2px var(--hue),inset 0 0 26px -4px #fff}
.galaxy:hover .galaxy-label span{color:var(--hue)}

.atlas.is-open .galaxy{opacity:0;pointer-events:none;transform:translate(-50%,-50%) scale(.7)}
.atlas.is-open .galaxy.is-active{opacity:1;left:50%!important;top:44%!important;transform:translate(-50%,-50%) scale(1.15)}

/* 글 = 행성 */
.planet{
  position:absolute;transform:translate(-50%,-50%);
  background:none;border:0;padding:0;cursor:pointer;color:inherit;
  animation:pop .5s cubic-bezier(.2,.8,.3,1) backwards;
}
.planet-body{
  display:block;width:var(--r,16px);height:var(--r,16px);border-radius:50%;
  background:radial-gradient(circle at 34% 30%,#fff 0%,var(--hue) 46%,rgba(0,0,0,.55) 100%);
  box-shadow:0 0 14px -2px var(--hue);
  transition:transform .2s ease,box-shadow .2s ease;
}
.planet:hover .planet-body,.planet:focus-visible .planet-body{transform:scale(1.45);box-shadow:0 0 26px 0 var(--hue)}
.planet-name{
  position:absolute;left:50%;top:calc(100% + 8px);transform:translateX(-50%);
  width:max-content;max-width:200px;
  font-size:11.5px;line-height:1.4;color:var(--ink);
  background:var(--panel);border:1px solid var(--line);border-radius:6px;
  padding:5px 9px;opacity:0;pointer-events:none;transition:opacity .18s;
  backdrop-filter:blur(6px);
}
.planet:hover .planet-name,.planet:focus-visible .planet-name{opacity:1}
.orbit-ring{
  position:absolute;left:50%;top:44%;transform:translate(-50%,-50%);
  border:1px solid var(--line);border-radius:50%;pointer-events:none;
}

/* 헤드업 */
.hud{position:absolute;left:clamp(16px,3vw,36px);top:calc(var(--head-h) + 22px);max-width:300px;z-index:20}
.hud[hidden]{display:none}
.hud-back{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;
  background:none;border:0;color:var(--muted);cursor:pointer;padding:0 0 14px;
}
.hud-back:hover{color:var(--ink)}
.hud-el{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--hue,#fff)}
.hud-name{font-family:var(--serif);font-weight:400;font-size:30px;margin:6px 0 8px}
.hud-line{font-size:12.5px;color:var(--muted);margin:0}

/* ★ 시그니처 : 스펙트럼 바 */
.spectrum{
  position:fixed;left:0;right:0;bottom:0;height:var(--spec-h);z-index:35;
  display:flex;align-items:center;gap:14px;
  padding:0 clamp(16px,3vw,36px);
  border-top:1px solid var(--line);
  background:linear-gradient(0deg,rgba(4,6,14,.9),rgba(4,6,14,.3));
  backdrop-filter:blur(10px);
}
.spectrum-end{font-family:var(--mono);font-size:10px;color:#4b566d;white-space:nowrap}
.spectrum-band{
  position:relative;flex:1;height:16px;border-radius:3px;
  background:linear-gradient(90deg,#3a0a6b,#2b3bd6,#22b7d8,#3ddc84,#f2e14c,#f08b2c,#c8253a);
  opacity:.30;transition:opacity .3s;
}
.spectrum:hover .spectrum-band{opacity:.5}
.spec-tick{
  position:absolute;top:-9px;bottom:-9px;width:2px;
  background:var(--hue);box-shadow:0 0 10px var(--hue);
  transform:translateX(-50%);border:0;padding:0;cursor:pointer;
  transition:box-shadow .2s,width .2s;
}
.spec-tick:hover,.spec-tick.is-lit{width:4px;box-shadow:0 0 22px 2px var(--hue)}
.spec-tick span{
  position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);
  font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;color:var(--hue);white-space:nowrap;
}

/* ── 목록 폴백 뷰 ─────────────────────────────────── */
/* ── 표시 규칙: 목록이 기본, 은하 지도는 홈에서만 ───────── */
.entry-feed{display:block}
.atlas{display:none}

body.atlas-mode .atlas{display:block}
body.atlas-mode .entry-feed{display:none}
body.atlas-mode.list-mode .atlas{display:none}
body.atlas-mode.list-mode .entry-feed{display:block}

body:not(.atlas-mode) #view-toggle{display:none}
body.atlas-mode .site-foot{
  position:fixed;bottom:0;left:0;right:0;
  padding-bottom:calc(var(--spec-h) + 10px);pointer-events:none;
}
body.list-mode .entry-feed{display:block}
body.list-mode .atlas{display:none}

.entry-item{border-bottom:1px solid var(--line)}
.entry-link{display:block;padding:22px 4px}
.entry-link:hover{background:rgba(255,255,255,.03)}
.entry-cat{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:var(--muted)}
.entry-title{font-family:var(--serif);font-weight:400;font-size:20px;margin:6px 0 6px}
.entry-desc{color:var(--muted);font-size:13.5px;margin:0 0 8px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.entry-date{font-family:var(--mono);font-size:10.5px;color:#4b566d}
.paging{display:flex;gap:10px;justify-content:center;padding:32px 0;font-family:var(--mono);font-size:12px}
.paging{max-width:760px;margin:0 auto;padding:8px 20px calc(var(--spec-h) + 60px)}
.paging a{padding:6px 10px;border:1px solid var(--line);border-radius:6px}
.paging a:hover{border-color:rgba(255,255,255,.35)}
/* ── 글 본문 ──────────────────────────────────────── */
.post{
  position:relative;z-index:5;
  max-width:720px;margin:0 auto;
  padding:calc(var(--head-h) + 56px) 20px 100px;
}
.post-cat{font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--muted);margin:0}
.post-title{font-family:var(--serif);font-weight:400;font-size:clamp(26px,4vw,38px);line-height:1.35;margin:12px 0 10px}
.post-meta{font-family:var(--mono);font-size:11px;color:#4b566d;margin:0 0 40px;
  padding-bottom:24px;border-bottom:1px solid var(--line)}
.post-body{font-size:16px;line-height:1.85;color:#d7dfec}
.post-body img{max-width:100%;height:auto;border-radius:8px}
.post-body h2{font-family:var(--serif);font-weight:400;font-size:24px;margin:44px 0 14px}
.post-body h3{font-size:18px;margin:32px 0 10px}
.post-body a{color:#8fb6ff;text-decoration:underline;text-underline-offset:3px}
.post-body blockquote{margin:24px 0;padding:2px 0 2px 18px;border-left:2px solid var(--ti);color:#aeb9cc}
.post-body pre{background:#070b16;border:1px solid var(--line);border-radius:8px;padding:16px;overflow:auto;font-family:var(--mono);font-size:13px}
.post-body table{width:100%;border-collapse:collapse;font-size:14px}
.post-body th,.post-body td{border:1px solid var(--line);padding:9px 12px;text-align:left}

.post-locked{border:1px solid var(--line);border-radius:10px;padding:24px;text-align:center}

/* ── 푸터 ─────────────────────────────────────────── */
.site-foot{
  position:relative;z-index:5;
  padding:0 clamp(16px,3vw,36px) calc(var(--spec-h) + 22px);
  text-align:center;
}
body#index .site-foot,body.list-mode .site-foot{position:fixed;bottom:0;left:0;right:0;padding-bottom:calc(var(--spec-h) + 10px);pointer-events:none}
.foot-note{font-size:11px;color:#3f4a60;margin:0}
.foot-count{font-family:var(--mono);font-size:10px;color:#333c4f;margin:6px 0 0}

/* ── 애니메이션 ───────────────────────────────────── */
@keyframes spin{to{transform:rotateX(72deg) rotate(360deg)}}
@keyframes pop{from{opacity:0;transform:translate(-50%,-50%) scale(.2)}to{opacity:1}}
@keyframes drift{50%{transform:translate(-50%,-50%) translateY(-10px)}}
.galaxy{animation:drift var(--dur,14s) ease-in-out infinite}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition-duration:.01ms!important}
}

/* ── 반응형 ───────────────────────────────────────── */
@media (max-width:820px){
  :root{--head-h:56px;--spec-h:50px}
  .tool-search{display:none}
  .galaxy-label b{font-size:14px}
  .galaxy-core{--size:64px}
  .hud{max-width:200px}
  .hud-name{font-size:22px}
  .spectrum-end{display:none}
}
@media (max-width:520px){
  .galaxy-core{--size:52px}
  .galaxy-label b{font-size:12.5px}
  .galaxy-label span{font-size:9px}
}