:root {
  color-scheme: dark;
  --page-bg: #020407;
  --board-gap: #030713;
  --tile-outer-rim: #03142E;
  --tile-rim-highlight: #0A2B61;
  --hidden-face-a: #12284F;
  --hidden-face-b: #07172F;
  --revealed-face-a: #EEF1F4;
  --revealed-face-b: #D6DAE0;
  --revealed-face-c: #B8BDC6;
  --revealed-inner-shadow: #8B929D;
  --blue-tail: #0064D8;
  --blue-head: #20B8FF;
  --blue-outline: #001D4F;
  --orange-tail: #E56D00;
  --orange-head: #FFD43A;
  --orange-outline: #5A2500;
  --bomb-body-a: #2A3442;
  --bomb-body-b: #111923;
  --bomb-outline: #02050A;
  --fuse-glow-a: #FF8A00;
  --fuse-glow-b: #FFD44A;
  --failure-red-a: #9B0610;
  --failure-red-b: #E21A23;
  --text: #F3F7FF;
  --muted: #8DA4C5;
  --line: rgba(96, 146, 220, 0.18);
  --focus: #35C8FF;
  --panel-width: clamp(15rem, 22vw, 20rem);
  --board-cols: 8;
  --board-rows: 13;
  --chrome-portrait: 11.75rem;
}

* { box-sizing: border-box; }
html, body { width: 100%; min-width: 100%; height: 100%; min-height: 100%; margin: 0; overflow: hidden; }
html { background: var(--page-bg); -webkit-text-size-adjust: 100%; }
body {
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 50% 42%, rgba(10, 43, 97, 0.30) 0, rgba(3, 20, 46, 0.10) 23rem, transparent 40rem),
    radial-gradient(circle at 20% 0%, rgba(32, 184, 255, 0.10), transparent 26rem),
    linear-gradient(180deg, #030713 0%, var(--page-bg) 52%, #010205 100%);
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  overscroll-behavior: none;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 0%, transparent 48%, rgba(0,0,0,.46) 100%);
  z-index: -1;
}
button, select { font: inherit; }
button, select, img { -webkit-tap-highlight-color: transparent; }
button { touch-action: manipulation; }
img { -webkit-user-drag: none; user-select: none; }

.app {
  width: 100vw;
  height: 100dvh;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--panel-width);
  align-items: stretch;
}

.board-region {
  min-width: 0;
  min-height: 0;
  height: 100dvh;
  display: grid;
  place-items: center;
  padding: max(8px, env(safe-area-inset-top)) 8px max(8px, env(safe-area-inset-bottom));
  overflow: hidden;
}

.board-shell {
  position: relative;
  aspect-ratio: var(--board-cols) / var(--board-rows);
  width: min(
    calc((100dvh - 16px) * var(--board-cols) / var(--board-rows)),
    calc(100vw - var(--panel-width) - 18px),
    calc(930px * var(--board-cols) / var(--board-rows))
  );
  max-width: calc(100vw - var(--panel-width) - 18px);
  max-height: min(calc(100dvh - 16px), 930px);
  display: grid;
  place-items: stretch;
  isolation: isolate;
}

.board-shell::before {
  content: "";
  position: absolute;
  inset: -2.5%;
  border-radius: 4.5%;
  background: linear-gradient(145deg, rgba(10,43,97,.28), rgba(1,5,14,.08));
  filter: blur(8px);
  opacity: .30;
  z-index: -1;
}

.board {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: repeat(var(--board-cols), minmax(0, 1fr));
  grid-template-rows: repeat(var(--board-rows), minmax(0, 1fr));
  gap: clamp(1px, .35vmin, 4px);
  padding: clamp(2px, .45vmin, 5px);
  background: var(--board-gap);
  border-radius: clamp(13px, 2.5vmin, 28px);
  touch-action: manipulation;
  overflow: hidden;
  contain: layout size paint;
  box-shadow:
    0 18px 48px rgba(0,0,0,.56),
    inset 0 1px 0 rgba(82, 135, 216, .10),
    inset 0 -1px 0 rgba(0,0,0,.66);
}
.board.is-loading { opacity: .42; filter: saturate(.7); }
.board-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 5;
  border-radius: clamp(13px, 2.5vmin, 28px);
  color: #CFE7FF;
  font-size: clamp(.9rem, 2.4vmin, 1.15rem);
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
  text-shadow: 0 2px 8px rgba(0,0,0,.72);
  background: rgba(2, 4, 7, .60);
  backdrop-filter: blur(4px);
}
.board-loading[hidden] { display: none; }

.tile {
  --arrow-fill-tail: var(--blue-tail);
  --arrow-fill-head: var(--blue-head);
  --arrow-outline: var(--blue-outline);
  position: relative;
  min-width: 0;
  min-height: 0;
  width: auto;
  height: auto;
  margin: 3.2%;
  padding: 0;
  border: 0;
  border-radius: 11%;
  background:
    linear-gradient(145deg, rgba(10, 43, 97, .52) 0%, rgba(3, 20, 46, .90) 42%, rgba(1, 6, 17, .98) 100%);
  color: var(--text);
  cursor: pointer;
  appearance: none;
  line-height: 1;
  overflow: hidden;
  display: grid;
  place-items: stretch;
  user-select: none;
  -webkit-user-select: none;
  contain: strict;
  box-shadow:
    0 5px 10px rgba(0,0,0,.46),
    0 1px 3px rgba(0,0,0,.48),
    inset 0 1px 1px rgba(90,130,200,.20),
    inset 0 -2px 4px rgba(0,0,0,.36);
  transform: translateZ(0);
  transition: transform 80ms cubic-bezier(.2,.9,.2,1), filter 120ms ease;
}
.tile::before {
  content: "";
  position: absolute;
  inset: 6%;
  border-radius: 8%;
  background: linear-gradient(145deg, var(--hidden-face-a) 0%, #102449 48%, var(--hidden-face-b) 100%);
  box-shadow:
    inset 0 1px 2px rgba(130,170,230,.15),
    inset 0 -1px 2px rgba(0,0,0,.28),
    0 0 0 1px rgba(9, 40, 92, .62);
  z-index: 0;
}
.tile::after {
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: inherit;
  background:
    linear-gradient(145deg, rgba(103, 149, 226, .22) 0%, rgba(10,43,97,.09) 23%, transparent 45%),
    linear-gradient(315deg, rgba(0,0,0,.20) 0%, transparent 48%);
  opacity: .42;
  pointer-events: none;
  z-index: 1;
}
.tile:active,
.tile.is-pressed { transform: scale(.965) translateZ(0); filter: brightness(1.08); }
.tile:focus-visible { outline: 3px solid var(--focus); outline-offset: -3px; z-index: 3; }
.tile:disabled { cursor: default; }
.tile.revealed { cursor: default; }
.tile.revealed::before {
  background: linear-gradient(145deg, var(--revealed-face-a) 0%, var(--revealed-face-b) 48%, var(--revealed-face-c) 100%);
  box-shadow:
    inset 0 1px 2px rgba(255,255,255,.50),
    inset 0 -2px 3px rgba(139,146,157,.30),
    0 0 0 1px rgba(123, 133, 148, .70);
}
.tile.revealed::after {
  background:
    linear-gradient(145deg, rgba(255,255,255,.52) 0%, rgba(255,255,255,.13) 31%, transparent 48%),
    linear-gradient(315deg, rgba(139,146,157,.18) 0%, transparent 45%);
  opacity: .56;
}
.tile.revealed:active { transform: none; filter: none; }
.tile.tie { --arrow-fill-tail: var(--orange-tail); --arrow-fill-head: var(--orange-head); --arrow-outline: var(--orange-outline); }
.tile.bomb::before {
  background: linear-gradient(145deg, var(--failure-red-a) 0%, #B80B17 45%, var(--failure-red-b) 100%);
  box-shadow:
    inset 0 2px 3px rgba(255,153,153,.34),
    inset 0 -3px 5px rgba(65,0,0,.55),
    0 0 0 1px rgba(240, 40, 50, .62);
}
.tile.bomb::after { background: linear-gradient(145deg, rgba(255,150,140,.34), transparent 44%); }
.tile.just-revealed { animation: tileReveal 190ms cubic-bezier(.18,.92,.2,1.2); }
.tile.bomb.just-revealed { animation: bombHit 300ms cubic-bezier(.3,.9,.2,1); }

.tile-content {
  position: absolute;
  inset: 5%;
  border-radius: 7%;
  display: grid;
  place-items: center;
  overflow: hidden;
  z-index: 2;
  pointer-events: none;
}
.arrow-svg,
.bomb-svg { display: block; pointer-events: none; overflow: visible; }
.arrow-svg { width: 112%; height: 112%; filter: drop-shadow(1px 3px 1px rgba(0,0,0,.28)); }
.arrow-svg.diagonal { width: 140%; height: 140%; }
.arrow-path-outline { fill: var(--arrow-outline); stroke: #02050A; stroke-width: 2; stroke-linejoin: round; }
.arrow-path-fill { stroke: rgba(255,255,255,.08); stroke-width: 1; stroke-linejoin: round; }
.arrow-highlight { fill: rgba(255,255,255,.34); mix-blend-mode: screen; }
.tile.tie .arrow-highlight { fill: rgba(255,228,107,.38); }
.bomb-svg { width: 104%; height: 104%; filter: drop-shadow(1px 3px 2px rgba(0,0,0,.42)); }

.panel {
  min-width: 0;
  height: 100dvh;
  padding: max(16px, env(safe-area-inset-top)) clamp(12px, 1.5vw, 18px) max(16px, env(safe-area-inset-bottom));
  background:
    linear-gradient(180deg, rgba(3, 14, 32, .90), rgba(1, 5, 14, .78)),
    rgba(2, 4, 7, .74);
  border-left: 1px solid rgba(10, 43, 97, .48);
  box-shadow: inset 1px 0 0 rgba(84, 132, 205, .10), -18px 0 40px rgba(0,0,0,.25);
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  display: flex;
  flex-direction: column;
  gap: clamp(11px, 2.1dvh, 18px);
}
.brand-row { display: grid; grid-template-columns: clamp(4.1rem, 8vw, 6.4rem) minmax(0, 1fr); gap: 10px; align-items: center; }
.brand-logo { width: 100%; height: auto; object-fit: contain; filter: drop-shadow(0 10px 18px rgba(0,0,0,.48)); }
.brand-copy h1 { margin: 0; font-size: clamp(1.28rem, 3.1vw, 2.1rem); line-height: .92; letter-spacing: .14em; text-transform: uppercase; font-weight: 950; }
.brand-copy p { margin: .32rem 0 0; color: var(--muted); font-size: clamp(.69rem, 1vw, .8rem); line-height: 1.2; letter-spacing: .08em; text-transform: uppercase; font-weight: 750; }
.hud { display: grid; gap: 12px; }
.field { display: grid; gap: 7px; color: var(--muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .09em; font-weight: 850; }
.field strong { display: block; color: var(--text); font-size: clamp(2.25rem, 7vw, 4rem); line-height: .88; letter-spacing: -.07em; text-shadow: 0 10px 22px rgba(0,0,0,.35); }
select {
  width: 100%;
  min-width: 0;
  border: 1px solid rgba(67, 115, 188, .42);
  border-radius: 15px;
  padding: 11px 13px;
  color: var(--text);
  background:
    linear-gradient(145deg, rgba(19,42,82,.92), rgba(7,23,47,.96));
  box-shadow: inset 0 1px 0 rgba(120,160,220,.14), 0 8px 18px rgba(0,0,0,.20);
}
select:disabled { opacity: .56; cursor: not-allowed; }
.secondary-actions { display: grid; gap: 8px; }
.link-button {
  border: 1px solid rgba(67, 115, 188, .36);
  border-radius: 15px;
  padding: 11px 13px;
  color: var(--text);
  background: linear-gradient(145deg, rgba(19,42,82,.58), rgba(7,23,47,.62));
  box-shadow: inset 0 1px 0 rgba(120,160,220,.12), 0 8px 18px rgba(0,0,0,.17);
  font-weight: 850;
  cursor: pointer;
  text-align: left;
}
.link-button:active { transform: translateY(1px); }
.link-button:focus-visible,
.primary-action:focus-visible,
.modal-close:focus-visible,
select:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.state-note { min-height: 1.25em; margin: 0; color: var(--muted); font-size: .86rem; line-height: 1.35; }
.debug-panel { margin-top: auto; border-top: 1px solid var(--line); padding-top: 12px; }
.debug-panel h2 { margin: 0 0 8px; font-size: .9rem; color: var(--muted); }
pre { overflow: auto; max-height: 28dvh; padding: 12px; border-radius: 14px; background: #020617; color: #cbd5e1; font-size: .78rem; user-select: text; }

.modal, .summary-modal { border: 0; padding: 0; background: transparent; color: var(--text); max-width: min(92vw, 33rem); max-height: min(92dvh, 48rem); }
.modal::backdrop, .summary-modal::backdrop { background: rgba(2, 4, 7, .66); backdrop-filter: blur(7px); }
.modal-card, .summary-card {
  position: relative;
  margin: 0;
  padding: clamp(18px, 4vw, 25px);
  border: 1px solid rgba(67,115,188,.36);
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(3, 14, 32, .98), rgba(1, 5, 14, .98));
  box-shadow: 0 26px 90px rgba(0,0,0,.58), inset 0 1px 0 rgba(120,160,220,.14);
  overflow: auto;
  max-height: min(92dvh, 48rem);
}
.modal-card h2, .summary-card h2 { margin: 0 0 14px; font-size: clamp(1.35rem, 6vw, 2.05rem); letter-spacing: -.04em; }
.modal-card p, .summary-card p { color: var(--muted); line-height: 1.45; margin: 0 0 12px; }
.summary-card { min-width: min(84vw, 24rem); text-align: center; }
.summary-card p { color: var(--text); font-size: 1.03rem; }
.primary-action {
  width: 100%;
  border: 0;
  border-radius: 16px;
  padding: 13px 16px;
  color: #03142E;
  background: linear-gradient(145deg, #20B8FF, #E5E7EA);
  box-shadow: 0 12px 25px rgba(0, 100, 216, .22), inset 0 1px 0 rgba(255,255,255,.52);
  font-weight: 950;
  cursor: pointer;
}
.primary-action:disabled { opacity: .5; cursor: not-allowed; }
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(67,115,188,.36);
  border-radius: 999px;
  color: var(--text);
  background: rgba(255,255,255,.06);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}
.modal-note { margin-top: 12px !important; font-size: .88rem; }
.blue { color: #35C8FF; }
.amber { color: #FFD43A; }
.manhattan-example { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: center; padding: 12px; border: 1px solid rgba(67,115,188,.36); border-radius: 16px; margin: 12px 0; background: rgba(19,42,82,.28); }
.manhattan-example p { margin: 0; }
.mini-grid { display: grid; grid-template-columns: repeat(4, 1.65rem); grid-template-rows: repeat(3, 1.65rem); gap: 3px; }
.mini-grid span { display: grid; place-items: center; border-radius: 7px; background: rgba(19,42,82,.62); color: var(--muted); font-size: .8rem; font-weight: 850; }
.mini-grid .start { color: #35C8FF; background: rgba(0,100,216,.30); }
.mini-grid .path { color: #F3F7FF; background: rgba(32,184,255,.20); }
.mini-grid .bomb { color: #FFD7D7; background: rgba(226,26,35,.35); }
.board-error { display: grid; place-items: center; color: var(--muted); width: 100%; height: 100%; text-align: center; padding: 1rem; }

@keyframes tileReveal {
  0% { transform: scale(.82); filter: brightness(1.25); }
  68% { transform: scale(1.045); filter: brightness(1.06); }
  100% { transform: scale(1); filter: brightness(1); }
}
@keyframes bombHit {
  0% { transform: translateX(0) scale(.92); filter: brightness(1.3); }
  22% { transform: translateX(-3px) rotate(-1.2deg) scale(1.04); }
  46% { transform: translateX(3px) rotate(1.2deg) scale(1.02); }
  72% { transform: translateX(-1px) rotate(-.5deg) scale(1); }
  100% { transform: translateX(0) scale(1); filter: brightness(1); }
}

@media (max-width: 1100px) and (orientation: landscape) {
  :root { --panel-width: clamp(11.25rem, 22vw, 15rem); }
  .panel { gap: 8px; padding: max(8px, env(safe-area-inset-top)) 10px max(8px, env(safe-area-inset-bottom)); }
  .brand-row { grid-template-columns: 3.4rem minmax(0, 1fr); gap: 8px; }
  .brand-copy h1 { font-size: 1.05rem; }
  .brand-copy p { display: none; }
  .field { font-size: .68rem; gap: 4px; }
  .field strong { font-size: clamp(1.7rem, 7dvh, 2.45rem); }
  select, .link-button, .primary-action { padding: 8px 10px; border-radius: 12px; font-size: .88rem; }
  .state-note { display: none; }
}

@media (orientation: portrait), (max-width: 760px) {
  :root { --panel-width: 100vw; }
  .app { display: flex; flex-direction: column; overflow: hidden; }
  .board-region { width: 100vw; height: auto; min-height: 0; padding: max(7px, env(safe-area-inset-top)) 7px 5px; flex: 0 0 auto; }
  .board-shell {
    width: min(calc(100vw - 14px), calc((100dvh - var(--chrome-portrait)) * var(--board-cols) / var(--board-rows)));
    max-width: calc(100vw - 14px);
    max-height: calc(100dvh - var(--chrome-portrait));
  }
  .panel {
    width: 100vw;
    height: auto;
    min-height: 0;
    flex: 1 1 auto;
    border-left: 0;
    border-top: 1px solid rgba(10, 43, 97, .48);
    padding: 8px 12px max(10px, env(safe-area-inset-bottom));
    gap: 8px;
  }
  .brand-row { grid-template-columns: 2.85rem minmax(0, 1fr); gap: 8px; }
  .brand-copy h1 { font-size: clamp(1.02rem, 5vw, 1.45rem); }
  .brand-copy p { display: none; }
  .hud { grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 10px; }
  .field { gap: 4px; font-size: .68rem; }
  .safe-field { min-width: 5.1rem; text-align: right; }
  .field strong { font-size: clamp(1.65rem, 8vw, 2.55rem); }
  select { padding: 9px 11px; border-radius: 12px; }
  .secondary-actions { display: flex; gap: 8px; }
  .link-button { flex: 1 1 0; text-align: center; padding: 9px 8px; border-radius: 12px; font-size: .9rem; }
  .state-note { display: none; }
  .board { gap: clamp(1px, .45vw, 3px); padding: clamp(2px, .55vw, 4px); }
  .tile { margin: 3.2%; }
}

@media (max-height: 660px) and (orientation: portrait) {
  :root { --chrome-portrait: 9.6rem; }
  .panel { gap: 6px; padding-top: 6px; }
  .brand-row { display: none; }
  .field { font-size: .64rem; }
  select { padding: 8px 10px; }
  .link-button { padding: 8px; font-size: .84rem; }
}

@media (max-width: 360px) {
  .secondary-actions { display: grid; grid-template-columns: 1fr; }
  .hud { grid-template-columns: 1fr; }
  .safe-field { text-align: left; }
  .manhattan-example { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: .001ms !important; }
}