:root {
  --void: #080c0b;
  --deep: #0b1210;
  --panel: #101815;
  --stone: #1a2420;
  --stone-hi: #27342e;
  --moss: #4e6a5a;
  --ink: #e7e4d9;
  --dim: #969d93;
  --faint: #626b64;
  --amber: #d5a442;
  --amber-deep: #6c4818;
  --cyan: #75e0c0;
  --line: rgba(231, 228, 217, .12);
  --serif: 'Cinzel', Georgia, serif;
  --sans: 'Source Sans 3', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--void); }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(circle at 50% 23%, rgba(65, 112, 90, .15), transparent 35rem),
    linear-gradient(180deg, #0d1512 0, var(--void) 68%);
  -webkit-font-smoothing: antialiased;
}
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:focus-visible, a:focus-visible, .board:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
.skip-link { position: fixed; top: -4rem; left: 1rem; z-index: 20; padding: .7rem 1rem; color: var(--void); background: var(--cyan); }
.skip-link:focus { top: 1rem; }

.mist {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .4;
  background-image:
    repeating-linear-gradient(115deg, transparent 0 42px, rgba(255,255,255,.012) 43px, transparent 44px 91px),
    radial-gradient(ellipse at 10% 70%, rgba(90,130,110,.08), transparent 35%),
    radial-gradient(ellipse at 90% 40%, rgba(90,130,110,.06), transparent 30%);
}

.topbar {
  min-height: 4.4rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: .8rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  background: rgba(8, 12, 11, .76);
  backdrop-filter: blur(12px);
}
.wizard-link { display: inline-flex; align-items: center; gap: .65rem; justify-self: start; color: var(--ink); text-decoration: none; font: 600 .78rem/1 var(--serif); letter-spacing: .22em; }
.sigil { color: var(--amber); font-size: 1.1rem; }
.run-mark { display: flex; gap: .7rem; align-items: baseline; color: var(--faint); font: .65rem/1 var(--mono); text-transform: uppercase; letter-spacing: .12em; }
.run-mark strong { color: var(--dim); font-weight: 500; }
.text-button { justify-self: end; border: 0; padding: .4rem 0; color: var(--dim); background: none; cursor: pointer; font-size: .78rem; text-transform: uppercase; letter-spacing: .13em; }
.text-button:hover { color: var(--cyan); }

main { width: min(1440px, 100%); margin: 0 auto; padding: 0 clamp(1rem, 3vw, 3rem); }
.intro { position: relative; isolation: isolate; margin-inline: calc(clamp(1rem, 3vw, 3rem) * -1); padding: clamp(3.8rem, 9vh, 7rem) clamp(1rem, 3vw, 3rem) clamp(3.2rem, 7vh, 5.5rem); overflow: hidden; text-align: center; }
.intro::before { content: ''; position: absolute; z-index: -2; inset: 0; background: url('assets/theorem-vault.jpg') center 44% / cover no-repeat; opacity: .64; }
.intro::after { content: ''; position: absolute; z-index: -1; inset: 0; background: linear-gradient(180deg, rgba(8,12,11,.18), rgba(8,12,11,.62) 55%, var(--void)), radial-gradient(ellipse at 50% 43%, rgba(5,10,9,.26), rgba(5,10,9,.72) 72%); }
.eyebrow, .label { margin: 0; color: var(--cyan); font: 500 .65rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: .2em; }
.intro h1 { margin: .65rem 0 .6rem; font: 600 clamp(2rem, 5vw, 4.4rem)/1.04 var(--serif); letter-spacing: .07em; text-shadow: 0 0 38px rgba(117,224,192,.09); }
.lede { max-width: 42rem; margin: 0 auto; color: #b9c0b8; font-size: clamp(.98rem, 1.5vw, 1.12rem); text-shadow: 0 2px 16px #000; }

.game-shell { display: grid; grid-template-columns: minmax(150px, .7fr) minmax(330px, 720px) minmax(150px, .7fr); gap: clamp(1.25rem, 3vw, 3rem); align-items: start; }
.floor-panel, .ledger { margin-top: 2.2rem; }
.depth-rule { display: flex; align-items: center; gap: .45rem; margin-bottom: 1.6rem; }
.depth-rule span { height: 1px; flex: 1; background: var(--line); }
.depth-rule i { width: .45rem; height: .45rem; border: 1px solid var(--amber); transform: rotate(45deg); }
.floor-number { display: flex; align-items: baseline; gap: .8rem; margin: .65rem 0 .35rem; }
.floor-number span { color: var(--dim); font-family: var(--serif); font-size: 1rem; }
.floor-number strong { color: var(--ink); font: 500 clamp(2.3rem, 4vw, 3.5rem)/1 var(--mono); }
.difficulty { display: flex; align-items: center; gap: .75rem; color: var(--amber); font: 500 .7rem/1 var(--mono); text-transform: uppercase; letter-spacing: .13em; }
.motif { display: grid; gap: .28rem; margin: 1rem 0 0; }
.motif span { color: var(--faint); font: .58rem/1 var(--mono); text-transform: uppercase; letter-spacing: .15em; }
.motif strong { color: var(--cyan); font: 500 .82rem/1.3 var(--serif); letter-spacing: .06em; }
.pips { display: flex; gap: .2rem; }
.pips i { width: 5px; height: 11px; border: 1px solid rgba(213,164,66,.35); transform: skew(-10deg); }
.pips i.on { border-color: var(--amber); background: var(--amber); box-shadow: 0 0 8px rgba(213,164,66,.35); }
.floor-jump { margin-top: 1.3rem; }
.floor-jump label { display: block; margin-bottom: .45rem; color: var(--faint); font: .62rem/1 var(--mono); text-transform: uppercase; letter-spacing: .14em; }
.floor-jump div { display: grid; grid-template-columns: minmax(0, 1fr) auto; }
.floor-jump input { min-width: 0; width: 100%; border: 1px solid var(--line); border-right: 0; padding: .58rem .65rem; color: var(--ink); background: rgba(5,9,8,.68); font: .76rem/1 var(--mono); }
.floor-jump button, .debug-descend { border: 1px solid rgba(117,224,192,.28); color: var(--cyan); background: rgba(117,224,192,.055); cursor: pointer; font: 500 .62rem/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.floor-jump button { padding: 0 .7rem; }
.floor-jump button:hover, .debug-descend:hover { border-color: var(--cyan); background: rgba(117,224,192,.12); }
.debug-descend { width: 100%; display: flex; justify-content: space-between; margin-top: .45rem; padding: .64rem .7rem; }
.lesson { margin: 1.5rem 0; padding-left: 1rem; border-left: 1px solid var(--amber-deep); color: var(--dim); line-height: 1.55; font-size: .92rem; }
.measurements { margin: 0; border-top: 1px solid var(--line); }
.measurements div { display: flex; justify-content: space-between; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--line); }
.measurements dt { color: var(--faint); font-size: .76rem; text-transform: uppercase; letter-spacing: .1em; }
.measurements dd { margin: 0; color: var(--dim); font: .74rem/1.5 var(--mono); text-align: right; }

.status-line { min-height: 2.2rem; display: flex; justify-content: space-between; gap: 1rem; color: var(--faint); font: .7rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.live-stats { white-space: nowrap; }
.live-stats[hidden] { display: none; }
.live-stats b { color: var(--ink); font-weight: 500; }
.board-frame { position: relative; min-height: 350px; display: grid; place-items: center; padding: clamp(12px, 2.3vw, 28px); overflow: hidden; border: 1px solid rgba(117,224,192,.16); background: rgba(7, 12, 10, .86); box-shadow: 0 28px 80px rgba(0,0,0,.36), inset 0 0 60px rgba(62,112,89,.045); }
.board-frame::before, .board-frame::after { content: ''; position: absolute; width: 35px; height: 35px; pointer-events: none; border-color: var(--amber-deep); }
.board-frame::before { top: 8px; left: 8px; border-top: 1px solid; border-left: 1px solid; }
.board-frame::after { right: 8px; bottom: 8px; border-right: 1px solid; border-bottom: 1px solid; }
.board { --cols: 7; width: min(100%, 660px); display: grid; grid-template-columns: repeat(var(--cols), 1fr); aspect-ratio: var(--board-ratio, 1); touch-action: none; user-select: none; filter: drop-shadow(0 14px 22px rgba(0,0,0,.42)); }
.tile { position: relative; aspect-ratio: 1; display: grid; place-items: center; min-width: 0; }
.tile.wall { background-image: linear-gradient(rgba(18,27,23,.3), rgba(10,16,14,.72)), url('assets/theorem-stone.jpg'); background-position: center, var(--texture-x) var(--texture-y); background-size: auto, 540px auto; border: 1px solid #29352f; box-shadow: inset 2px 2px 0 rgba(255,255,255,.025), inset -2px -2px 0 rgba(0,0,0,.3); }
.tile.wall::after { content: ''; position: absolute; inset: 10%; border-top: 1px solid rgba(255,255,255,.018); transform: rotate(var(--scratch, 0deg)); }
.tile.void { background: transparent; }
.tile.floor { background-image: linear-gradient(rgba(10,17,14,.78), rgba(10,17,14,.78)), url('assets/theorem-stone.jpg'); background-position: center, var(--texture-x) var(--texture-y); background-size: auto, 760px auto; border: 1px solid rgba(123,151,135,.075); }
.tile.floor::before { content: ''; position: absolute; inset: 7%; border: 1px solid rgba(121,145,132,.026); }
.tile.goal::after { content: ''; position: absolute; width: 45%; height: 45%; border: max(1px, .08em) solid var(--cyan); transform: rotate(45deg); box-shadow: 0 0 13px rgba(117,224,192,.45), inset 0 0 11px rgba(117,224,192,.2); animation: breathe 2.8s ease-in-out infinite; }
.box-piece { z-index: 3; width: 72%; height: 72%; display: grid; place-items: center; border: 1px solid #e7bc62; background: linear-gradient(135deg, #a56e25, #6f4518); box-shadow: 0 5px 8px rgba(0,0,0,.42), inset 2px 2px 0 rgba(255,229,160,.19), inset -3px -3px 0 rgba(52,29,8,.35); transition: transform .12s ease; }
.box-piece::before { content: ''; width: 38%; height: 38%; border: 1px solid rgba(255,229,160,.55); transform: rotate(45deg); }
.tile.box-on-goal .box-piece { border-color: var(--cyan); box-shadow: 0 0 18px rgba(117,224,192,.34), inset 2px 2px 0 rgba(255,255,255,.14); }
.player-piece { z-index: 4; width: 58%; height: 64%; position: relative; border-radius: 48% 48% 37% 37%; background: linear-gradient(145deg, #83b49b, #375b4b 66%, #223c32); box-shadow: 0 6px 9px rgba(0,0,0,.45), 0 0 13px rgba(117,224,192,.14); }
.player-piece::before { content: ''; position: absolute; width: 54%; height: 44%; left: 23%; top: 14%; border-radius: 50%; background: #111a17; box-shadow: inset 0 -4px 0 rgba(117,224,192,.08); }
.player-piece::after { content: ''; position: absolute; width: 13%; height: 13%; left: 44%; top: 31%; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 7px var(--cyan); }
.tile.hint-box .box-piece { animation: hintBox .7s ease-in-out infinite alternate; }
.tile.hint-destination { box-shadow: inset 0 0 0 2px var(--amber), inset 0 0 18px rgba(213,164,66,.3); }
.board.deadlocked { filter: drop-shadow(0 14px 22px rgba(0,0,0,.42)) drop-shadow(0 0 11px rgba(191,70,50,.38)); }
.board.deadlocked .tile.box:not(.box-on-goal) .box-piece { border-color: #c7664e; }

.board-loading { position: absolute; z-index: 8; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .9rem; color: var(--dim); background: rgba(7,12,10,.92); font: .68rem/1 var(--mono); text-transform: uppercase; letter-spacing: .13em; }
.board-loading span { width: 1.2rem; height: 1.2rem; border: 1px solid var(--faint); border-top-color: var(--cyan); transform: rotate(45deg); animation: carve 1.2s linear infinite; }
.board-loading.hidden { display: none; }
.victory { position: absolute; z-index: 9; inset: 0; padding: clamp(1rem, 3vw, 2rem); place-items: center; align-content: center; overflow: auto; text-align: center; background: radial-gradient(circle at 50% 38%, rgba(25,55,45,.65), rgba(7,13,11,.95) 60%); backdrop-filter: blur(6px); }
.victory:not([hidden]) { display: grid; }
.victory-sigil { color: var(--cyan); font-size: 1.5rem; text-shadow: 0 0 20px var(--cyan); animation: victoryPulse 1.3s ease-out infinite; }
.victory p { margin: .65rem 0 .4rem; color: var(--amber); font: .65rem/1 var(--mono); text-transform: uppercase; letter-spacing: .18em; }
.victory h2 { max-width: 38rem; margin: 0 0 1.2rem; font: 500 clamp(1.15rem, 3vw, 2rem)/1.25 var(--serif); letter-spacing: .035em; }
.analysis-grid { width: min(100%, 38rem); display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line); margin-bottom: 1rem; }
.analysis-grid div { display: grid; gap: .28rem; padding: .7rem .45rem; border-right: 1px solid var(--line); }
.analysis-grid div:last-child { border: 0; }
.analysis-grid strong { color: var(--cyan); font: 500 1.05rem/1 var(--mono); }
.analysis-grid span { color: var(--faint); font: .54rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.victory-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .55rem; }
.primary-button { border: 1px solid var(--cyan); padding: .8rem 1.2rem; color: #c9ffed; background: rgba(117,224,192,.09); cursor: pointer; font: 500 .68rem/1 var(--mono); text-transform: uppercase; letter-spacing: .12em; }
.primary-button:hover { color: var(--void); background: var(--cyan); }
.secondary-button { border: 1px solid var(--line); padding: .8rem 1rem; color: var(--dim); background: rgba(255,255,255,.025); cursor: pointer; font: 500 .66rem/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.secondary-button:hover { color: var(--amber); border-color: var(--amber-deep); }

.controls { min-height: 5rem; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem; padding-top: .9rem; }
.action-row { display: flex; gap: .45rem; }
.action-row button { display: flex; align-items: center; gap: .45rem; border: 0; padding: .4rem; color: var(--dim); background: none; cursor: pointer; font-size: .72rem; }
kbd { min-width: 1.6rem; padding: .25rem .35rem; border: 1px solid var(--line); border-bottom-color: rgba(255,255,255,.22); color: var(--ink); background: var(--panel); font: .64rem/1 var(--mono); text-align: center; box-shadow: 0 2px 0 #050807; }
.action-row button:hover { color: var(--cyan); }
.action-row button:disabled { opacity: .35; cursor: default; }
.primary-button:disabled, .debug-descend:disabled { opacity: .38; cursor: default; filter: grayscale(.65); }
.key-help { justify-self: end; margin: 0; color: var(--faint); font-size: .7rem; }
.dpad { display: none; grid-template-columns: repeat(3, 2.4rem); grid-template-rows: repeat(2, 2.4rem); gap: .2rem; }
.dpad button { border: 1px solid var(--line); color: var(--ink); background: var(--panel); }
.dpad button:first-child { grid-column: 2; }
.dpad button:nth-child(2) { grid-column: 1; grid-row: 2; }
.dpad button:nth-child(3) { grid-column: 2; grid-row: 2; }
.dpad button:nth-child(4) { grid-column: 3; grid-row: 2; }

.ledger { padding: 1.2rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.record { display: flex; align-items: baseline; justify-content: space-between; gap: .7rem; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.record span { color: var(--faint); font-size: .76rem; }
.record strong { color: var(--ink); font: 500 1.1rem/1 var(--mono); }
.guarantee { margin: 1.2rem 0 0; color: var(--dim); font-size: .76rem; line-height: 1.55; }
.guarantee span { color: var(--cyan); margin-right: .3rem; }
.archive-note { margin: 1rem 0 0; min-height: 2.4rem; color: var(--amber); font: .68rem/1.5 var(--serif); letter-spacing: .04em; }
.method-note { width: min(820px, 100%); margin: clamp(4rem, 9vh, 8rem) auto 0; padding: clamp(2rem, 5vw, 4rem); border: 1px solid var(--line); text-align: center; background: linear-gradient(135deg, rgba(117,224,192,.035), rgba(213,164,66,.025)); }
.method-note h2 { margin: .65rem 0 .85rem; font: 500 clamp(1.6rem, 3vw, 2.6rem)/1.15 var(--serif); letter-spacing: .035em; }
.method-note > p:not(.eyebrow) { max-width: 42rem; margin: 0 auto; color: var(--dim); line-height: 1.65; }
.method-marks { display: flex; flex-wrap: wrap; justify-content: center; gap: .45rem; margin-top: 1.35rem; }
.method-marks span { padding: .4rem .65rem; border: 1px solid var(--line); color: var(--cyan); font: .58rem/1 var(--mono); text-transform: uppercase; letter-spacing: .09em; }
footer { display: flex; justify-content: space-between; gap: 1rem; width: min(1440px, calc(100% - 2rem)); margin: clamp(2rem, 6vh, 5rem) auto 0; padding: 1.4rem 0 2.5rem; border-top: 1px solid var(--line); color: var(--faint); font: .64rem/1.5 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
footer p { margin: 0; }

@keyframes breathe { 50% { opacity: .65; transform: rotate(45deg) scale(.86); } }
@keyframes carve { to { transform: rotate(405deg); } }
@keyframes hintBox { to { transform: translateY(-8%); filter: brightness(1.3); } }
@keyframes victoryPulse { 50% { transform: scale(1.25) rotate(45deg); } }

@media (max-width: 980px) {
  .game-shell { grid-template-columns: minmax(130px, .42fr) minmax(330px, 1.5fr); }
  .ledger { grid-column: 1 / -1; margin-top: 0; display: grid; grid-template-columns: 1fr 1fr 1fr 1.5fr; gap: 1rem; align-items: center; }
  .ledger .label { grid-column: 1 / -1; }
  .record { border-bottom: 0; padding: 0; }
  .guarantee { margin: 0; }
  .archive-note { display: none; }
}

@media (max-width: 680px) {
  .topbar { grid-template-columns: 1fr 1fr; }
  .run-mark { display: none; }
  .intro { padding-top: 2rem; }
  .game-shell { grid-template-columns: 1fr; }
  .floor-panel { margin: 0; display: grid; grid-template-columns: 1fr auto; gap: .5rem 1rem; align-items: end; }
  .depth-rule, .floor-panel > .label, .measurements { display: none; }
  .floor-number { margin: 0; }
  .difficulty { justify-self: end; }
  .motif { grid-column: 1 / -1; margin-top: .2rem; }
  .floor-jump { grid-column: 1; margin-top: .5rem; }
  .debug-descend { grid-column: 2; grid-row: 2; align-self: end; margin: 0; width: auto; min-height: 2.25rem; }
  .lesson { grid-column: 1 / -1; margin: .3rem 0 .6rem; }
  .status-line { min-height: 1.8rem; }
  .board-frame { min-height: 300px; margin-inline: -.55rem; padding: 12px; }
  .controls { grid-template-columns: 1fr auto; }
  .dpad { display: grid; grid-row: 1 / span 2; grid-column: 2; }
  .key-help { justify-self: start; }
  .ledger { grid-template-columns: 1fr 1fr; }
  .archive-note { display: block; grid-column: 1 / -1; }
  .guarantee { grid-column: 1 / -1; }
  footer { flex-direction: column; }
}

@media (max-width: 480px) {
  .analysis-grid { grid-template-columns: repeat(2, 1fr); }
  .analysis-grid div:nth-child(2) { border-right: 0; }
  .analysis-grid div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .analysis-grid div:nth-child(4) { border-right: 0; }
  .analysis-grid div:nth-child(n+3) { border-bottom: 1px solid var(--line); }
  .analysis-grid div:last-child { grid-column: 1 / -1; border-bottom: 0; }
  .victory-actions { display: grid; width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}