/* 바다는 어디로 흐르는가 — /lab/sea-rhythm/styles.css 위에 얹는 이 노트 전용 스타일 */
html{scroll-behavior:smooth;scroll-padding-top:70px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--bg);padding:8px 12px;z-index:20}.skip:focus{left:12px}
.title-spread .lead{max-width:680px}
.oc-toc{list-style:none;margin:40px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px 22px;font-size:14px}
.oc-toc a{color:var(--ink-soft);text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:2px}
.oc-toc a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.spread-deck b{color:var(--ink);font-weight:500}
.spread-header{max-width:760px}.spread-deck{max-width:640px}

/* I. 원리 */
.oc-three{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,24px)}
.oc-three article{border-top:1px solid var(--line);padding-top:18px}
.oc-three article.hl{border-top:2px solid var(--accent)}
.oc-three span{display:block;font-family:var(--font-serif);font-size:20px;color:var(--ink);margin-bottom:8px}
.oc-three p{font-size:14.5px;line-height:1.7;color:var(--ink-soft)}
.oc-sub{font-family:var(--font-serif);font-weight:400;font-size:22px;margin:clamp(40px,6vw,64px) 0 0}
.oc-forces{grid-template-columns:repeat(4,1fr);margin-top:20px}
.oc-src{font-size:12.5px;margin-top:10px}.oc-src a{color:var(--muted);text-decoration:none;border-bottom:1px solid var(--line)}.oc-src a:hover{color:var(--accent)}
.oc-callout{margin:28px 0 0;max-width:720px;padding:16px 20px;background:var(--bg-2);border:1px solid var(--line);font-size:14.5px;line-height:1.7;color:var(--ink-soft)}
.oc-callout b{color:var(--ink);font-weight:500}

/* 지도 */
.atlas{margin:clamp(20px,4vw,36px) 0 0;background:var(--bg-2);border:1px solid var(--line);border-radius:4px;padding:clamp(16px,2.4vw,28px)}
.atlas-bar{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 20px;margin-bottom:14px;font-size:13px;color:var(--muted)}
.atlas-bar label{display:flex;align-items:center;gap:10px;color:var(--ink-soft)}
.atlas-select{background:var(--bg);color:var(--ink);border:1px solid var(--line);padding:7px 10px;font:inherit;font-size:14px;border-radius:2px}
.atlas-legend{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.atlas-legend i{display:inline-block;width:18px;height:2px;margin:0 4px 0 10px;vertical-align:middle}
.atlas-legend i.w{background:#f4a47a}.atlas-legend i.c{background:repeating-linear-gradient(90deg,#6fb5d6 0 5px,transparent 5px 8px)}.atlas-legend i.n{background:#d8cf9a}
.atlas-map{position:relative}
.atlas-svg{display:block;width:100%;height:auto}
.atlas-svg .grid{stroke:rgba(138,166,161,.08);fill:none}
.atlas-svg .land{fill:#15343a;stroke:#24474e;stroke-width:.6}
/* 지도 라벨: #6f8f8a(육지 위 3.77:1) → #86a29d(육지 4.84·바다 6.27:1), 크기는 라벨 최소 크기 규칙(맨 아래)으로 */
.atlas-svg .lbl{fill:#86a29d;font-size:max(15px,calc(var(--k,0) * var(--lab-min,11px)));letter-spacing:.18em;font-family:var(--font-sans)}
.atlas[data-view="korea"] .atlas-svg .lbl{font-size:max(17px,calc(var(--k,0) * var(--lab-min,11px)))}
.fl{cursor:pointer}
.fl:focus{outline:none}
/* 키보드 포커스: 해류 선 둘레에 accent 띠(넓은 hit 경로를 칠함) + 외곽선 */
.fl:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.fl:focus-visible .fl-hit{stroke:rgba(244,164,122,.28)}
.fl-line{fill:none;stroke-width:2.4;stroke-linecap:round;opacity:.45;transition:opacity .25s,stroke-width .25s}
.fl.cold .fl-line{stroke-dasharray:7 5}
.fl-hit{fill:none;stroke:transparent;stroke-width:18}
.fl-dot{opacity:.75}
.fl:hover .fl-line{opacity:.8}.fl:focus-visible .fl-line{opacity:1}
.fl.on .fl-line{opacity:1;stroke-width:4}
.fl.on .fl-dot{opacity:1}
.atlas[data-view="korea"] .fl-line{stroke-width:3}.atlas[data-view="korea"] .fl.on .fl-line{stroke-width:5}
.atlas-sel{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:6px 28px;margin-top:16px;padding-top:16px;border-top:1px solid var(--line)}
.atlas-sel h3{font-family:var(--font-serif);font-weight:400;font-size:26px;grid-row:span 2}
.atlas-sel h3.warm{color:#f4a47a}.atlas-sel h3.cold{color:#6fb5d6}.atlas-sel h3.neutral{color:#d8cf9a}
.atlas-sel .r{font-size:13px;color:var(--muted)}
.atlas-sel p{font-size:14.5px;line-height:1.65;color:var(--ink-soft)}
.atlas-sel a{grid-column:2;font-size:13px;color:var(--ink-soft)}
.oc-cap{font-size:12.5px;color:var(--muted);line-height:1.6;max-width:760px;margin:12px 0 0}

/* 도감 카드 */
.cur-group{margin-top:clamp(40px,6vw,64px)}
.cur-group-head{display:grid;grid-template-columns:minmax(0,220px) minmax(0,1fr);gap:8px 28px;align-items:baseline;border-top:1px solid var(--line);padding-top:18px;margin-bottom:18px}
.cur-group-head h3{font-family:var(--font-serif);font-weight:400;font-size:22px}
.cur-group-head p{font-size:14.5px;line-height:1.7;color:var(--ink-soft);max-width:620px}
.cur-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:clamp(14px,1.8vw,20px)}
#korea .cur-grid{margin-top:clamp(24px,4vw,40px);grid-template-columns:repeat(2,minmax(0,1fr))}
.cur-card{background:var(--bg-2);border:1px solid var(--line);border-left:2px solid var(--line);border-radius:0 4px 4px 0;padding:clamp(18px,2.2vw,24px);scroll-margin-top:80px;display:flex;flex-direction:column}
.cur-card.warm{border-left-color:#f4a47a}.cur-card.cold{border-left-color:#6fb5d6}.cur-card.neutral{border-left-color:#d8cf9a}
.cur-card:target{border-color:var(--accent)}
.cur-top{display:flex;justify-content:space-between;font-size:11.5px;letter-spacing:.14em;color:var(--muted);margin-bottom:10px}
.cur-tag.warm{color:#f4a47a}.cur-tag.cold{color:#6fb5d6}.cur-tag.neutral{color:#d8cf9a}
.cur-card h4{font-family:var(--font-serif);font-weight:400;font-size:22px;color:var(--ink);line-height:1.25}
.cur-card h4 small{display:block;font-style:italic;font-size:14px;color:var(--muted);margin-top:2px}
.cur-route{font-size:13px;color:var(--muted);margin:10px 0 10px;padding-bottom:10px;border-bottom:1px solid var(--line-soft)}
.cur-card>p{font-size:14px;line-height:1.7;color:var(--ink-soft)}
.cur-note{margin-top:10px;font-size:13px!important;color:var(--muted)!important;border-left:2px solid var(--line);padding-left:10px}
.obs{margin-top:12px}
.obs-link{font-size:13px;color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(244,164,122,.4)}
.obs-link:hover{border-bottom-color:var(--accent)}
.cur-bottom{margin-top:auto;padding-top:14px;display:flex;justify-content:space-between;align-items:flex-start;gap:12px;font-size:12.5px}
.locate{background:none;border:0;padding:0;font:inherit;color:var(--ink-soft);cursor:pointer;border-bottom:1px solid var(--line)}
.locate:hover{color:var(--accent)}
.cur-bottom details{text-align:right;max-width:65%;color:var(--muted)}
.cur-bottom summary{cursor:pointer}
.cur-bottom details a{display:block;margin-top:6px;color:var(--ink-soft);text-decoration:none}

/* IV. 깊이 */
.oc-two{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,40px)}
.oc-two h3{font-family:var(--font-serif);font-weight:400;font-size:22px;margin-bottom:10px}
.oc-two p{font-size:15px;line-height:1.75;color:var(--ink-soft)}
.oc-amoc{margin:clamp(30px,5vw,48px) 0 0;background:var(--bg-2);border:1px solid var(--line);border-radius:4px;padding:18px}
.oc-amoc svg{display:block;width:100%;height:auto}
.oc-amoc .t{fill:var(--muted);font-size:max(14px,calc(var(--k,0) * var(--lab-min,11px)));font-family:var(--font-sans)}.oc-amoc .t.w{fill:#f4a47a}.oc-amoc .t.c{fill:#6fb5d6}
.amoc-w{stroke:#f4a47a;stroke-width:3;fill:none}.amoc-c{stroke:#6fb5d6;stroke-width:3;fill:none;stroke-dasharray:7 5}.amoc-sink{stroke:#8aa6a1;stroke-width:2;fill:none;stroke-dasharray:3 4}
.dot-w{fill:#e7f0ee}
.oc-amoc figcaption{font-size:12.5px;color:var(--muted);margin-top:8px}
.oc-qa{margin-top:clamp(28px,4vw,40px);max-width:760px;border-left:1px solid var(--accent);padding-left:clamp(18px,2.5vw,28px)}
.oc-qa h3{font-family:var(--font-serif);font-weight:400;font-size:20px;margin-bottom:8px}
.oc-qa p{font-size:15px;line-height:1.75;color:var(--ink-soft)}.oc-qa a{color:var(--ink-soft)}
#life .reasons-grid{margin-bottom:0}

@media (max-width:900px){.oc-forces{grid-template-columns:1fr 1fr}.oc-three{grid-template-columns:1fr}}
@media (max-width:700px){
  .oc-two,#korea .cur-grid{grid-template-columns:1fr}
  .cur-group-head{grid-template-columns:1fr}
  .atlas-sel{grid-template-columns:1fr}.atlas-sel h3{grid-row:auto}.atlas-sel a{grid-column:1}
  .oc-forces{grid-template-columns:1fr}
  .atlas-legend{font-size:12px}
}
@media (prefers-reduced-motion:reduce){.oc-amoc animateMotion{display:none}}
@media (max-width:700px){
  .atlas-svg .lbl,.atlas[data-view="korea"] .atlas-svg .lbl{font-size:max(30px,calc(var(--k,0) * var(--lab-min,11px)))}
  .fl-line{stroke-width:4.5}.fl.on .fl-line,.atlas[data-view="korea"] .fl.on .fl-line{stroke-width:7}
  .atlas{padding:14px}
}

/* 큰 원(환류) */
.gy-band{fill:none;stroke:rgba(231,240,238,.07);stroke-width:14;stroke-linecap:round;stroke-linejoin:round;transition:stroke .3s}
.gy-dot{fill:rgba(231,240,238,.38)}
/* 환류 이름: 투명도 .55(4.24:1)·.4(2.86:1) → .7·.62 (4.5:1 이상) */
.gy-lbl{fill:rgba(196,211,207,.7);font-size:max(13px,calc(var(--k,0) * var(--lab-min,11px)));letter-spacing:.12em;font-family:var(--font-sans)}
.gy-sub{fill:rgba(196,211,207,.62);font-size:max(11.5px,calc(var(--k,0) * var(--lab-min,11px)));font-family:var(--font-sans)}
.gyre.on .gy-band{stroke:rgba(244,164,122,.16)}
.gyre.on .gy-dot{fill:rgba(244,164,122,.75)}
.gyre.on .gy-lbl{fill:#f4a47a}.gyre.on .gy-sub{fill:rgba(244,164,122,.7)}
.atlas-svg.no-gyre .gyres{display:none}
.gy-toggle-l{display:flex;align-items:center;gap:6px;color:var(--ink-soft);cursor:pointer}
.gy-toggle{accent-color:#f4a47a}
@media (max-width:700px){.gy-lbl{font-size:max(26px,calc(var(--k,0) * var(--lab-min,11px)))}.gy-sub{display:none}.gy-band{stroke-width:22}.gy-dot{r:4}}

/* 관측 평균 흐름(NOAA 표류부이) */
.obs-l{fill:none;stroke:#e7f0ee;stroke-width:.85;stroke-linecap:round;stroke-dasharray:12 9;animation:obs-run 3s linear infinite}
@keyframes obs-run{to{stroke-dashoffset:-21}}
.atlas-svg.no-obs .obs{display:none}
@media (prefers-reduced-motion:reduce){.obs-l{animation:none;stroke-dasharray:none}}
.obs-check{display:block;font-size:12.5px;line-height:1.5;color:var(--ink-soft);padding:2px 0 6px}
.fl.weak .fl-line{stroke-dasharray:2 6;opacity:.35}.fl.weak.on .fl-line{opacity:.85}.fl.weak .fl-dot{opacity:.45}
.cur-tag.weak{opacity:.7}
.ctx-line{fill:none;stroke-width:5;opacity:.28;stroke-linecap:round}
/* 쿠로시오 본류 라벨: opacity .6(3.84:1) → .75(5.3:1) */
.ctx-lbl{fill:#f4a47a;opacity:.75;font-size:max(15px,calc(var(--k,0) * var(--lab-min,11px)));letter-spacing:.04em}
.front-line{fill:none;stroke:#e7f0ee;stroke-width:1.4;stroke-dasharray:1 5;stroke-linecap:round;opacity:.75}
.front-lbl{fill:#e7f0ee;opacity:.75;font-size:max(14px,calc(var(--k,0) * var(--lab-min,11px)))}
.atlas-legend i.y{background:repeating-linear-gradient(90deg,#f4a47a 0 2px,transparent 2px 6px)}
.atlas-legend i.f{background:repeating-linear-gradient(90deg,#e7f0ee 0 1px,transparent 1px 4px)}
@media (max-width:700px){.ctx-lbl,.front-lbl{font-size:max(24px,calc(var(--k,0) * var(--lab-min,11px)))}}
/* 움직임 멈춤 · 지도 크게 보기 */
.mo-btn,.big-btn,.big-close{font:inherit;font-size:12.5px;color:var(--ink-soft);background:transparent;border:1px solid var(--line);border-radius:999px;padding:5px 12px;cursor:pointer}
.mo-btn:hover,.big-btn:hover,.big-close:hover{border-color:var(--accent);color:var(--ink)}
.mo-btn:focus-visible,.big-btn:focus-visible,.big-close:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.mo-btn[aria-pressed="true"]{border-color:var(--accent);color:var(--accent)}
.mo-paused .obs-l{animation-play-state:paused}
.big-btn,.big-close{display:none}
@media (max-width:700px){.big-btn{display:inline-block}}
.atlas.big .atlas-map{position:fixed;inset:0;z-index:1000;background:var(--bg);overflow:auto;padding:58px 0 16px;-webkit-overflow-scrolling:touch}
.atlas.big .atlas-svg{width:1600px;max-width:none;height:auto;display:block}
.atlas.big[data-view="korea"] .atlas-svg{width:1250px}
.atlas.big .big-close{display:block;position:fixed;top:12px;right:16px;z-index:1001;background:var(--bg-2)}
body.oc-lock{overflow:hidden}
/* 크게 보기에서는 데스크톱 크기 글자·선으로 */
.atlas.big .atlas-svg .lbl{font-size:15px}.atlas.big[data-view="korea"] .atlas-svg .lbl{font-size:17px}
.atlas.big .gy-lbl{font-size:13px}.atlas.big .gy-sub{display:inline}.atlas.big .gy-band{stroke-width:14}.atlas.big .gy-dot{r:2.6}
.atlas.big .ctx-lbl{font-size:15px}.atlas.big .front-lbl{font-size:14px}
.atlas.big .fl-line{stroke-width:2.4}.atlas.big .fl.on .fl-line{stroke-width:4}
.mo-paused .fl-dot{display:none}

/* ─── 라벨 최소 크기 · 가로 스크롤 (한국 바다 개념 노트 공용) ───
   fit-labels.js가 svg마다 --k(= viewBox 폭 ÷ 화면 폭)를 적고, 라벨은 max(원래 크기, --k × --lab-min).
   폰에서는 지도·도식에 최소 폭을 줘 글자를 지키고, 상자 안에서 가로로 밀어 본다. */
:root{--lab-min:11px}
@media (max-width:599px){:root{--lab-min:10px}}
@media (max-width:700px){
  .atlas-map{overflow-x:auto;overscroll-behavior-x:contain}
  .atlas-svg{min-width:450px}
  .oc-amoc{overflow-x:auto;overscroll-behavior-x:contain}
  .oc-amoc svg{min-width:450px}
  .oc-amoc figcaption{position:sticky;left:0}
}
/* 넘칠 때만(.is-scroll) 보이는 안내 — 스크롤해도 왼쪽에 붙어 있다 */
.sa-fig.is-scroll::before,.atlas-map.is-scroll::before,.oc-amoc.is-scroll::before{content:"← 옆으로 밀어 보기 →";position:sticky;left:0;display:block;margin:0 0 8px;font-size:12px;letter-spacing:.04em;color:var(--muted);text-align:center}
.atlas.big .atlas-map.is-scroll::before{content:none}
.sa-fig.is-scroll:focus-visible,.atlas-map.is-scroll:focus-visible,.oc-amoc.is-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:2px}