/* Layout: moderan "instrument dashboard" — plutajuća navigacija, simulacija u velikoj zaobljenoj kartici, poglavlja kao bento kartice (teorija lijevo, instrument desno). Jedan namjerno taman izgled. */
:root{
  --bg:#07080c;
  --panel:#0f1117;
  --panel-2:#151822;
  --line:rgba(255,255,255,.08);
  --line-2:rgba(255,255,255,.14);
  --ink:#f4f5f8;
  --text:#c3c7d2;
  --dim:#7f8594;
  --accent:#b8ff5c;
  --accent-rgb:184,255,92;
  --ion:#6cc8ff;
  --ion-rgb:108,200,255;
  --warn:#ff8a4c;
  --warn-rgb:255,138,76;
  --r-lg:24px;
  --r-md:16px;
  --r-sm:10px;
  --sans:"Geist", "Inter", "Segoe UI", system-ui, sans-serif;
  --mono:"Geist Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:
  radial-gradient(900px 520px at 78% -120px, rgba(var(--ion-rgb),.13), transparent 70%),
  radial-gradient(700px 420px at 8% -60px, rgba(var(--accent-rgb),.07), transparent 70%),
  var(--bg);
  color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--bg)}
img{max-width:100%}
[hidden]{display:none!important}
.wrap{max-width:1240px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--sans);font-weight:600;text-wrap:balance;margin:0;letter-spacing:-.035em}
p{margin:0}
a{color:var(--ion)}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
::selection{background:rgba(var(--accent-rgb),.35)}
.label{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--dim)}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* nav — plutajuća staklena traka */
nav.top{position:sticky;top:calc(env(safe-area-inset-top,0px) + 12px);z-index:9;margin-top:12px}
nav.top .wrap{display:flex;justify-content:center}
nav.top .bar{display:flex;align-items:center;gap:6px;padding:6px;max-width:100%;border-radius:999px;background:rgba(15,17,23,.72);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border:1px solid var(--line);box-shadow:0 10px 30px -10px rgba(0,0,0,.6)}
nav.top .brand{display:flex;align-items:center;gap:8px;padding:0 10px 0 8px;font-weight:600;font-size:14px;letter-spacing:-.02em;white-space:nowrap;color:var(--ink);text-decoration:none}
nav.top .brand i{width:16px;height:16px;border-radius:50%;background:#000;box-shadow:0 0 0 2px var(--accent),0 0 12px rgba(var(--accent-rgb),.6);flex:none}
nav.top .links{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;min-width:0}
nav.top .links::-webkit-scrollbar{display:none}
nav.top .links a{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--dim);text-decoration:none;padding:7px 12px;border-radius:999px;white-space:nowrap;transition:color .2s,background .2s}
nav.top .links a .n{font-family:var(--mono);font-size:10px;opacity:.7}
nav.top .links a:hover{color:var(--ink);background:rgba(255,255,255,.05)}
nav.top .links a.on{color:#0a0b0f;background:var(--ink)}
@media (max-width:700px){nav.top .brand span{display:none}nav.top .brand{padding:0 6px}}

/* hero */
.hero{position:relative;padding-block:56px 8px}
.hero::before{content:"";position:absolute;inset:-80px 0 auto;height:560px;z-index:-1;pointer-events:none;
  background-image:radial-gradient(rgba(255,255,255,.09) 1px, transparent 1px);background-size:22px 22px;
  -webkit-mask-image:radial-gradient(ellipse 60% 70% at 50% 30%, #000 20%, transparent 75%);mask-image:radial-gradient(ellipse 60% 70% at 50% 30%, #000 20%, transparent 75%)}
.hero-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,380px);gap:32px;align-items:end;margin-bottom:28px}
.badge{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:500;color:var(--text);padding:5px 12px 5px 10px;border-radius:999px;border:1px solid var(--line-2);background:rgba(255,255,255,.03);margin-bottom:20px}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 rgba(var(--accent-rgb),.6);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 8px rgba(var(--accent-rgb),0)}100%{box-shadow:0 0 0 0 rgba(var(--accent-rgb),0)}}
@media (prefers-reduced-motion:reduce){.pulse{animation:none}}
.hero h1{font-size:clamp(44px,8.4vw,112px);line-height:.92;font-weight:700;letter-spacing:-.055em}
.hero h1 .grad{background:linear-gradient(100deg,var(--ink) 0%,var(--ion) 55%,var(--accent) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lede{color:var(--text);font-size:16px;line-height:1.55}
.stage{position:relative;border-radius:var(--r-lg);overflow:hidden;background:#000;aspect-ratio:16/9;max-height:78vh;width:100%;border:1px solid var(--line);touch-action:none;cursor:grab;box-shadow:0 40px 120px -40px rgba(var(--ion-rgb),.25)}
.stage:active{cursor:grabbing}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.stage .hud,.stage .hint{position:absolute;font-family:var(--mono);font-size:11px;pointer-events:none;padding:6px 10px;border-radius:999px;background:rgba(0,0,0,.45);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.08)}
.stage .hud{left:14px;bottom:14px;color:rgba(244,245,248,.85)}
.stage .hint{right:14px;top:14px;color:rgba(244,245,248,.6)}
.stage .nogl{position:absolute;inset:0;display:grid;place-items:center;padding:24px;text-align:center;color:var(--dim)}
@media (max-width:760px){.stage{aspect-ratio:4/5;max-height:none}.hero-head{grid-template-columns:1fr;gap:16px}.hero{padding-top:40px}}

.card{background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.012));border:1px solid var(--line);border-radius:var(--r-lg)}
.controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px 28px;padding:20px 22px;margin-top:12px}
.ctl{display:flex;flex-direction:column;gap:8px;min-width:0}
.ctl .row{display:flex;justify-content:space-between;gap:8px;align-items:baseline}
.ctl output{font-family:var(--mono);font-size:12px;color:var(--ink);background:rgba(255,255,255,.05);padding:2px 8px;border-radius:6px}
.toggles{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.chip{border:1px solid var(--line-2);background:transparent;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:500;cursor:pointer;display:inline-flex;gap:8px;align-items:center;color:var(--dim);transition:all .2s}
.chip::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.5}
.chip[aria-pressed="true"]{border-color:rgba(var(--accent-rgb),.5);color:var(--accent);background:rgba(var(--accent-rgb),.08)}
.chip[aria-pressed="true"]::before{opacity:1;box-shadow:0 0 8px var(--accent)}
.chip:hover{border-color:var(--dim);color:var(--ink)}

/* klizači s ispunom (--p postavlja paintRange u util.js) */
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:22px;background:transparent;margin:0;cursor:pointer;--p:50%}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:4px;background:linear-gradient(90deg,var(--accent) var(--p),rgba(255,255,255,.1) var(--p))}
input[type=range]::-moz-range-track{height:4px;border-radius:4px;background:rgba(255,255,255,.1)}
input[type=range]::-moz-range-progress{height:4px;border-radius:4px;background:var(--accent)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--ink);margin-top:-7px;border:0;box-shadow:0 0 0 4px rgba(var(--accent-rgb),.18),0 2px 6px rgba(0,0,0,.5);transition:box-shadow .2s}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--ink);border:0;box-shadow:0 0 0 4px rgba(var(--accent-rgb),.18)}
input[type=range]:hover::-webkit-slider-thumb,input[type=range]:active::-webkit-slider-thumb{box-shadow:0 0 0 7px rgba(var(--accent-rgb),.22),0 2px 6px rgba(0,0,0,.5)}

.legend{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:12px}
.legend > div{padding:20px;min-width:0}
.legend h3{font-size:18px;margin:10px 0 6px;letter-spacing:-.02em}
.legend p{color:var(--dim);font-size:14px;line-height:1.55}
.legend .label{display:inline-flex;align-items:center;gap:8px}
.legend .label::before{content:"";width:6px;height:6px;border-radius:2px;background:var(--accent)}
@media (max-width:960px){.legend{grid-template-columns:1fr 1fr}}
@media (max-width:540px){.legend{grid-template-columns:1fr}}

/* chapters */
section.ch{padding-block:96px 8px;scroll-margin-top:72px}
.ch-head{margin-bottom:36px;max-width:820px}
.ch-tag{display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:500;color:var(--text);margin-bottom:16px}
.ch-num{font-family:var(--mono);font-size:11px;font-weight:500;color:#0a0b0f;background:var(--accent);padding:3px 8px;border-radius:6px;letter-spacing:.04em}
.ch-head h2{font-size:clamp(32px,4.8vw,56px);line-height:1.02;letter-spacing:-.045em}
.ch-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:20px;align-items:start}
.prose{display:flex;flex-direction:column;gap:16px;max-width:62ch;padding:4px 20px 0 0}
.prose p{color:var(--text)}
.prose strong{color:var(--ink);font-weight:600}
.eq{font-family:var(--mono);font-size:14px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 18px;overflow-x:auto;white-space:nowrap;color:var(--ink);box-shadow:inset 3px 0 0 var(--ion)}
.eq .c{color:var(--dim)}
.note{font-size:13.5px;color:var(--dim);padding:10px 14px;border-radius:var(--r-sm);background:rgba(var(--ion-rgb),.05);border:1px solid rgba(var(--ion-rgb),.14)}
.note.accent{background:rgba(var(--accent-rgb),.05);border-color:rgba(var(--accent-rgb),.16)}
.inst{padding:22px;display:flex;flex-direction:column;gap:18px;min-width:0}
.inst canvas{width:100%;display:block;border-radius:var(--r-md);background:#05060a;border:1px solid var(--line)}
.readouts{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px}
.readouts > div{background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:var(--r-md);padding:14px 16px;display:flex;flex-direction:column;gap:6px;min-width:0}
.readouts .v{font-family:var(--mono);font-size:17px;color:var(--ink);overflow-wrap:anywhere;letter-spacing:-.01em}
.readouts .v.big{font-size:22px;color:var(--accent);font-weight:500}
.presets{display:flex;flex-wrap:wrap;gap:6px}
.presets button{border:1px solid var(--line-2);background:transparent;border-radius:999px;padding:5px 12px;font-size:13px;font-weight:500;cursor:pointer;color:var(--dim);transition:all .2s}
.presets button:hover{color:var(--ink);border-color:var(--dim)}
.presets button.on{color:#0a0b0f;background:var(--accent);border-color:var(--accent)}
.verdict{font-size:14.5px;padding:14px 16px;border-radius:var(--r-md);background:rgba(var(--ion-rgb),.07);border:1px solid rgba(var(--ion-rgb),.22);color:var(--ink)}
.verdict.warn{background:rgba(var(--warn-rgb),.08);border-color:rgba(var(--warn-rgb),.32)}
@media (max-width:960px){.ch-body{grid-template-columns:minmax(0,1fr);gap:28px}.prose{padding-right:0}section.ch{padding-top:72px}}
@media (max-width:480px){.inst{padding:16px}}

/* pojava kartica pri skrolanju (samo gdje je podržano) */
@supports (animation-timeline:view()){
  @media (prefers-reduced-motion:no-preference){
    .ch-head,.ch-body > *{animation:rise linear both;animation-timeline:view();animation-range:entry 0% entry 40%}
  }
}
@keyframes rise{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}

/* anatomy */
.anat{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:18px;align-items:start}
.anat svg{width:100%;height:auto;display:block}
.anat ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.anat li button{width:100%;text-align:left;background:transparent;border:1px solid transparent;border-radius:var(--r-sm);padding:9px 12px;cursor:pointer;display:flex;justify-content:space-between;gap:8px;color:var(--dim);font-size:14px;transition:all .2s}
.anat li button:hover{color:var(--ink);background:rgba(255,255,255,.03)}
.anat li button span:last-child{font-family:var(--mono);font-size:11px}
.anat li button[aria-pressed="true"]{border-color:rgba(var(--accent-rgb),.35);color:var(--ink);background:rgba(var(--accent-rgb),.07)}
.anat li button[aria-pressed="true"] span:last-child{color:var(--accent)}
.anat-desc{min-height:110px;padding:18px 20px}
.anat-desc h3{font-size:24px;margin:8px 0 6px}
.anat-desc p{color:var(--text);font-size:15px}
@media (max-width:600px){.anat{grid-template-columns:1fr}}
.ring{fill:none;stroke:#353a4a;stroke-width:1.2;transition:stroke .2s,stroke-width .2s}
.ring.dash{stroke-dasharray:4 5}
.ring.on{stroke:var(--accent);stroke-width:2.4}
.rlabel{font-family:var(--mono);font-size:11px;fill:var(--dim)}

/* clocks */
.clocks{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.clock{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;min-width:0;padding:16px 12px;border-radius:var(--r-md);background:rgba(255,255,255,.025);border:1px solid var(--line)}
.clock svg{width:100%;max-width:180px;height:auto}
.clock .label{text-align:center}
.clock .num{font-size:15px}

/* tidal */
.tidal-vis{display:grid;grid-template-columns:120px 1fr;gap:20px;align-items:center}
.tidal-vis svg{width:120px;height:220px}
@media (max-width:420px){.tidal-vis{grid-template-columns:1fr}.tidal-vis svg{margin:0 auto}}

/* timeline */
.tl{list-style:none;margin:0;padding:0 0 0 22px;display:flex;flex-direction:column;position:relative}
.tl::before{content:"";position:absolute;left:4px;top:12px;bottom:12px;width:1px;background:linear-gradient(var(--accent),var(--ion) 60%,transparent)}
.tl li{position:relative;display:grid;grid-template-columns:72px minmax(0,1fr);gap:16px;padding:14px 0}
.tl li::before{content:"";position:absolute;left:-22px;top:21px;width:9px;height:9px;border-radius:50%;background:var(--bg);border:2px solid var(--accent)}
.tl .y{font-family:var(--mono);font-size:15px;font-weight:500;color:var(--accent);line-height:1.6}
.tl h3{font-size:18px;margin-bottom:4px;letter-spacing:-.02em}
.tl p{color:var(--dim);font-size:14px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-md)}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:460px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
th{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--dim);font-weight:400;background:rgba(255,255,255,.02)}
tbody tr{transition:background .2s}
tbody tr:hover{background:rgba(255,255,255,.03)}
td.num{text-align:right}
th.num{text-align:right}
tr:last-child td{border-bottom:0}

footer{margin-top:96px;padding-block:32px 56px;color:var(--dim);font-size:13px;border-top:1px solid var(--line)}
footer .wrap{display:flex;gap:24px;justify-content:space-between;align-items:flex-start;flex-wrap:wrap}
footer p{max-width:72ch}
footer .brand{display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:600;letter-spacing:-.02em}
footer .brand i{width:12px;height:12px;border-radius:50%;background:#000;box-shadow:0 0 0 2px var(--accent)}