:root {
  --ink: #05101c;
  --ink2: #0a1d30;
  --ice: #d9f3ff;
  --glacier: #7fd3ff;
  --deep: #2b7bd6;
  --warm: #ffcf6b;
  --text: #e9f5ff;
  --muted: #9cb8cf;
  --line: rgba(190, 233, 255, .16);
  --glass: rgba(14, 38, 60, .55);
  --r: 18px;
  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --body: "Manrope", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-snap-type: y proximity; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--ink); color: var(--text); font: 17px/1.55 var(--body);
  overflow-x: hidden; -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; cursor: pointer; }
img { display: block; max-width: 100%; }
b { color: #fff; }

/* ---------- ramy ---------- */
.slide {
  position: relative; min-height: 100vh; scroll-snap-align: start;
  display: flex; align-items: center; padding: 48px 16px;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(127, 211, 255, .10), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(43, 123, 214, .14), transparent 60%),
    var(--ink);
  overflow: hidden;
}
.slide:nth-of-type(even) { background-color: var(--ink2); }
.wrap { width: min(1080px, 100%); margin: 0 auto; }
.wrap.wide { width: min(1320px, 100%); }
.wrap.narrow { width: min(760px, 100%); }
.kicker {
  font: 600 13px/1 var(--body); letter-spacing: .22em; text-transform: uppercase;
  color: var(--glacier); margin: 0 0 14px;
}
h1, h2, h3 { font-family: var(--display); margin: 0; line-height: 1.02; letter-spacing: -.02em; }
h2 { font-size: clamp(32px, 4.6vw, 58px); font-weight: 800; }
h3 { font-size: 24px; font-weight: 700; }
.sub { color: var(--muted); max-width: 72ch; font-size: 17px; margin: 12px 0 24px; }
.btn {
  border: 1px solid rgba(217, 243, 255, .35); background: rgba(127, 211, 255, .12);
  padding: 12px 22px; border-radius: 999px; font-weight: 700; letter-spacing: .01em;
  backdrop-filter: blur(8px); transition: background .25s, transform .25s, box-shadow .25s;
}
.btn:hover { background: rgba(127, 211, 255, .24); transform: translateY(-2px); box-shadow: 0 10px 30px rgba(127, 211, 255, .2); }
.btn.big { font-size: 19px; padding: 16px 30px; }
.btn span { display: inline-block; margin-left: 6px; animation: bob 1.6s ease-in-out infinite; }
@keyframes bob { 50% { transform: translateY(4px); } }

/* ---------- nawigacja ---------- */
#progress { position: fixed; inset: 0 auto auto 0; height: 3px; width: 0; z-index: 50; background: linear-gradient(90deg, var(--glacier), #fff); box-shadow: 0 0 12px var(--glacier); }
#dots { position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 40; display: flex; flex-direction: column; gap: 12px; }
#dots button {
  width: 11px; height: 11px; border-radius: 50%; border: 1.5px solid rgba(217, 243, 255, .6);
  background: transparent; padding: 0; position: relative; transition: .3s;
}
#dots button.on { background: var(--ice); transform: scale(1.35); box-shadow: 0 0 12px var(--glacier); }
#dots button::after {
  content: attr(data-name); position: absolute; right: 22px; top: 50%; transform: translateY(-50%) translateX(6px);
  white-space: nowrap; font-size: 13px; font-weight: 600; background: var(--glass); padding: 4px 10px; border-radius: 8px;
  opacity: 0; pointer-events: none; transition: .25s; backdrop-filter: blur(6px);
}
#dots button:hover::after { opacity: 1; transform: translateY(-50%); }
#hint {
  position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%); z-index: 40; font-size: 13px;
  color: var(--muted); background: var(--glass); padding: 6px 14px; border-radius: 99px; backdrop-filter: blur(6px);
  transition: opacity .6s;
}
@media (max-width: 700px) { #dots { right: 6px; } #hint { display: none; } }

/* ---------- hero ---------- */
.hero { padding: 0 16px; }
.hero-bg { position: absolute; inset: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; transform-origin: 60% 50%; animation: ken 30s ease-in-out infinite alternate; filter: saturate(.8) brightness(.75); }
@keyframes ken { from { transform: scale(1.05); } to { transform: scale(1.22) translate(-2%, 2%); } }
.hero-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5, 16, 28, .75), rgba(5, 16, 28, .15) 70%), linear-gradient(180deg, rgba(5, 16, 28, .1), rgba(5, 16, 28, .5) 60%, var(--ink)); }
#snow { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.hero-inner { position: relative; width: min(1080px, 100%); margin: 0 auto; }
.hero h1 { font-size: clamp(64px, 15vw, 210px); font-weight: 800; line-height: .86; letter-spacing: -.045em; text-shadow: 0 10px 60px rgba(0, 30, 60, .5); }
.hero h1 .ch { display: inline-block; }
.hero .lead { font-size: clamp(18px, 2.2vw, 24px); max-width: 34ch; margin: 26px 0 34px; color: #d7ebf8; }

/* ---------- karty flip ---------- */
.flip-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; }
.flip { border: 0; background: none; padding: 0; perspective: 1400px; height: min(300px, 36vh); min-height: 230px; text-align: left; }
.flip-in { position: relative; width: 100%; height: 100%; transition: transform .9s cubic-bezier(.2, .8, .2, 1); transform-style: preserve-3d; }
.flip.on .flip-in { transform: rotateY(180deg); }
.face { position: absolute; inset: 0; border-radius: var(--r); backface-visibility: hidden; overflow: hidden; padding: 26px; display: flex; flex-direction: column; justify-content: flex-end; border: 1px solid var(--line); }
.front { background: linear-gradient(180deg, transparent 30%, rgba(5, 16, 28, .85)), var(--img) center/cover; }
.front h3 { font-size: 40px; }
.tag { position: absolute; top: 20px; left: 22px; font-size: 12px; letter-spacing: .2em; text-transform: uppercase; background: rgba(5, 16, 28, .5); padding: 5px 10px; border-radius: 6px; }
.tap { position: absolute; top: 20px; right: 22px; font-size: 13px; color: var(--ice); animation: pulse 2s infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.back { transform: rotateY(180deg); background: linear-gradient(160deg, #123756, #0a1d30); justify-content: center; gap: 4px; }
.back p { margin: 10px 0 0; color: #cfe4f3; }
.back .fact { color: var(--warm); font-size: 15px; }

/* ---------- jak powstaje lód ---------- */
.ice-maker { margin-top: 20px; display: grid; grid-template-columns: 220px 1fr; gap: 28px; align-items: center; background: var(--glass); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; }
.im-box { position: relative; width: 220px; height: 220px; flex: none; border-radius: 14px; background: linear-gradient(180deg, #0d2944, #0a2036); overflow: hidden; border: 1px solid var(--line); }
.im-box i { position: absolute; left: 0; top: 0; width: 14px; height: 14px; border-radius: 50%; background: #fff; }
.im-box .solid { position: absolute; inset: auto 0 0 0; height: 0; background: linear-gradient(180deg, #8fd8ff, #2b7bd6); }
.im-steps { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.im-step { border: 1px solid var(--line); background: transparent; padding: 8px 16px; border-radius: 99px; font-weight: 700; transition: .25s; }
.im-step.on { background: var(--ice); color: var(--ink); }
#imDesc { color: #cfe4f3; margin: 0; min-height: 3em; }
@media (max-width: 640px) { .ice-maker { grid-template-columns: 1fr; justify-items: center; } }

/* ---------- mapa ---------- */
.map-grid { display: grid; grid-template-columns: 1fr 340px; gap: 24px; align-items: start; }
.map-box { position: relative; border-radius: var(--r); overflow: hidden; border: 1px solid var(--line); background: #071a2c; }
#map { width: 100%; height: auto; max-height: calc(100vh - 250px); display: block; margin: 0 auto; }
.map-badge { position: absolute; left: 16px; top: 14px; font: 800 26px var(--display); background: rgba(5, 16, 28, .6); padding: 6px 14px; border-radius: 10px; backdrop-filter: blur(6px); }
.seg { display: grid; gap: 10px; }
.seg.two { grid-template-columns: 1fr 1fr; }
.seg button { text-align: left; border: 1px solid var(--line); background: var(--glass); padding: 12px 16px; border-radius: 14px; transition: .25s; display: flex; flex-direction: column; gap: 2px; }
.seg button small { color: var(--muted); font-size: 13px; }
.seg button:hover { border-color: rgba(217, 243, 255, .5); transform: translateX(3px); }
.seg button.on { background: linear-gradient(135deg, #d9f3ff, #8fd8ff); color: var(--ink); border-color: transparent; box-shadow: 0 10px 30px rgba(127, 211, 255, .25); }
.seg button.on b { color: var(--ink); }
.seg button.on small { color: #24506f; }
.info-card { margin-top: 14px; background: var(--glass); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; min-height: 120px; }
.info-card p { margin: 0 0 8px; color: #cfe4f3; font-size: 15.5px; }
.info-card h4 { margin: 0 0 6px; font: 700 19px var(--display); }
.toggle { display: flex; gap: 10px; align-items: center; margin-top: 14px; cursor: pointer; font-weight: 600; font-size: 15px; }
.toggle input { width: 20px; height: 20px; accent-color: var(--glacier); }
.map-legend { font-size: 13px; }
@media (max-width: 900px) { .map-grid { grid-template-columns: 1fr; } }

/* ---------- przekrój ---------- */
.xs-box { position: relative; border-radius: var(--r); overflow: hidden; border: 1px solid var(--line); aspect-ratio: 1600 / 640; max-height: calc(100vh - 230px); min-height: 300px; margin: 0 auto; background: #0b2238; }
#xs { position: absolute; inset: 0; width: 100%; height: 100%; }
.xs-ui { position: absolute; left: 16px; top: 14px; right: 16px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; pointer-events: none; }
.xs-ui > * { pointer-events: auto; }
.xs-dir { font-size: 13px; color: #24425c; background: rgba(255, 255, 255, .7); padding: 5px 12px; border-radius: 99px; }
.xs-dir b { color: #0b2238; }
.hot { cursor: pointer; }
.hot .ring { transform-box: fill-box; transform-origin: center; animation: ring 1.8s ease-out infinite; }
@keyframes ring { from { transform: scale(.6); opacity: 1; } to { transform: scale(2.1); opacity: 0; } }
.hot:hover .dot { fill: #fff; }
.hot.seen .dot { fill: #9be7a6; }
.hot text { font: 700 22px var(--body); paint-order: stroke; stroke: rgba(5, 16, 28, .75); stroke-width: 5px; fill: #fff; }
.panel {
  position: absolute; right: 14px; top: 14px; bottom: 14px; width: min(380px, calc(100% - 28px)); background: rgba(7, 22, 38, .92);
  border: 1px solid var(--line); border-radius: 16px; overflow: auto; transform: translateX(110%); transition: transform .55s cubic-bezier(.2, .8, .2, 1);
  backdrop-filter: blur(10px); z-index: 3;
}
.panel.open { transform: none; }
.panel-x { position: absolute; right: 10px; top: 8px; z-index: 2; border: 0; background: rgba(5, 16, 28, .6); width: 34px; height: 34px; border-radius: 50%; font-size: 22px; line-height: 1; }
.panel-img { height: 170px; background: var(--img, linear-gradient(135deg, #1b4d74, #0b2238)) center/cover; }
.panel-img:empty:not([style]) { display: none; }
.panel-body { padding: 18px 20px 22px; }
.panel-body h3 { font-size: 28px; margin-bottom: 8px; }
.panel-body p { margin: 0 0 10px; color: #cfe4f3; font-size: 15.5px; }
.panel-body .ex { color: var(--warm); }
@media (max-width: 760px) { .xs-box { aspect-ratio: auto; height: 70vh; } }

/* ---------- jeziora ---------- */
.lakes { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.lake { position: relative; height: 300px; border: 1px solid var(--line); border-radius: var(--r); padding: 0; overflow: hidden; text-align: left; background: var(--img) center/cover; }
.lake::before { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, rgba(5, 16, 28, .85)); transition: .5s; }
.lake .q { position: absolute; left: 18px; bottom: 16px; font: 800 30px var(--display); transition: .5s; }
.lake .q::after { content: "?"; color: var(--glacier); margin-left: 4px; }
.lake .ans { position: absolute; inset: 0; padding: 22px; display: flex; flex-direction: column; justify-content: flex-end; gap: 8px; font-size: 15px; color: #d8ecf8; background: rgba(8, 30, 52, .88); clip-path: circle(0% at 50% 100%); transition: clip-path .8s cubic-bezier(.2, .8, .2, 1); }
.lake .ans b { font: 800 26px var(--display); color: var(--ice); }
.lake.on .ans { clip-path: circle(150% at 50% 100%); }
.lake:hover { box-shadow: 0 14px 40px rgba(0, 0, 0, .35); }

/* ---------- tatry 3d ---------- */
.dark3d { padding: 0; background: #08121c; }
#t3d { position: absolute; inset: 0; }
#t3d canvas { display: block; }
#t3dLabels { position: absolute; inset: 0; pointer-events: none; }
.t3d-lab {
  position: absolute; left: 0; top: 0; pointer-events: auto; border: 0; white-space: nowrap; font-weight: 700; font-size: 13px;
  background: rgba(5, 16, 28, .72); color: #fff; padding: 5px 10px 5px 8px; border-radius: 99px; transform: translate(-50%, -130%);
  backdrop-filter: blur(4px); border: 1px solid rgba(217, 243, 255, .3); transition: background .2s;
}
.t3d-lab::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--warm); margin-right: 6px; box-shadow: 0 0 8px var(--warm); }
.t3d-lab::after { content: ""; position: absolute; left: 50%; bottom: -14px; width: 1px; height: 14px; background: rgba(255, 255, 255, .6); }
.t3d-lab:hover { background: rgba(43, 123, 214, .9); }
.t3d-ui { position: relative; z-index: 2; width: min(380px, calc(100% - 32px)); margin: 0 0 0 max(16px, 4vw); background: rgba(5, 16, 28, .66); backdrop-filter: blur(10px); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; }
.t3d-ui h2 { font-size: clamp(30px, 4vw, 46px); }
.t3d-ui .sub { font-size: 15px; margin: 12px 0 16px; }
.t3d-load { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); color: var(--muted); }
@media (max-width: 760px) { .t3d-ui { align-self: flex-end; margin: 0 auto 16px; padding: 16px; } .t3d-ui .sub { display: none; } }

/* ---------- dolina V/U ---------- */
.vu { background: var(--glass); border: 1px solid var(--line); border-radius: var(--r); padding: 16px; }
#vu { width: 100%; height: auto; display: block; border-radius: 12px; }
.vu-ui { display: grid; grid-template-columns: 1fr auto; gap: 8px 16px; align-items: center; margin-top: 12px; }
.vu-labels { grid-column: 1; display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); order: 3; }
#vuRange { width: 100%; accent-color: var(--glacier); }
.photo-strip { margin: 22px 0 0; display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; align-items: center; }
.photo-strip img { border-radius: var(--r); aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }
.photo-strip figcaption { color: #cfe4f3; }
@media (max-width: 760px) { .photo-strip { grid-template-columns: 1fr; } }

/* ---------- ciekawostki ---------- */
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.fact-card {
  position: relative; height: 230px; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; text-align: left; padding: 20px;
  background: linear-gradient(180deg, rgba(10, 29, 48, .55), rgba(10, 29, 48, .92)), var(--img, linear-gradient(135deg, #123756, #0a1d30)) center/cover;
  display: flex; flex-direction: column; justify-content: flex-end;
}
.big-n { font: 800 66px/1 var(--display); letter-spacing: -.04em; transition: .5s; }
.unit { font: 700 22px var(--display); color: var(--glacier); position: absolute; right: 20px; top: 18px; }
.lbl { font-size: 13px; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-top: 6px; }
.hid { position: absolute; inset: 0; padding: 20px; background: linear-gradient(160deg, #1a4a72, #0b2238); color: #e2f1fb; display: flex; align-items: center; font-size: 15.5px; transform: translateY(101%); transition: transform .6s cubic-bezier(.2, .8, .2, 1); }
.fact-card.on .hid { transform: none; }

/* ---------- quiz ---------- */
.quiz { background: var(--glass); border: 1px solid var(--line); border-radius: var(--r); padding: 26px; margin-top: 26px; min-height: 360px; }
.q-top { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.q-bar { height: 4px; background: rgba(255, 255, 255, .1); border-radius: 4px; margin-bottom: 20px; overflow: hidden; }
.q-bar i { display: block; height: 100%; background: var(--glacier); transition: width .5s; }
.q-text { font: 700 clamp(22px, 3vw, 30px)/1.2 var(--display); margin-bottom: 20px; }
.q-ans { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.q-ans button { border: 1px solid var(--line); background: rgba(255, 255, 255, .04); padding: 14px 16px; border-radius: 12px; text-align: left; font-weight: 600; transition: .2s; }
.q-ans button:hover:not(:disabled) { background: rgba(127, 211, 255, .14); }
.q-ans button.ok { background: #1f7a4a; border-color: #46d38a; }
.q-ans button.bad { background: #7a1f2b; border-color: #e5636f; animation: shake .4s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.q-why { margin-top: 16px; color: #cfe4f3; min-height: 1.5em; }
.q-next { margin-top: 12px; }
.q-end { text-align: center; padding: 30px 0; }
.q-end .score { font: 800 96px/1 var(--display); background: linear-gradient(180deg, #fff, var(--glacier)); -webkit-background-clip: text; background-clip: text; color: transparent; }
@media (max-width: 560px) { .q-ans { grid-template-columns: 1fr; } }

/* ---------- koniec ---------- */
.sum { list-style: none; padding: 0; margin: 30px 0; display: grid; gap: 14px; counter-reset: s; }
.sum li { position: relative; padding: 18px 20px 18px 74px; background: var(--glass); border: 1px solid var(--line); border-radius: 14px; color: #cfe4f3; }
.sum li::before { counter-increment: s; content: counter(s); position: absolute; left: 20px; top: 50%; transform: translateY(-50%); font: 800 40px var(--display); color: var(--glacier); }
.thanks { font: 800 clamp(36px, 6vw, 72px) var(--display); margin: 30px 0 10px; background: linear-gradient(90deg, #fff, var(--glacier), #fff); background-size: 200% 100%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: shine 4s linear infinite; }
@keyframes shine { to { background-position: -200% 0; } }
.credits { margin-top: 30px; color: var(--muted); font-size: 13px; }
.credits summary { cursor: pointer; font-weight: 700; }
.credits a { color: var(--glacier); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}