.dtn-page-shell,
.dtn-game-wrap {
  --dtn-bg: #070912;
  --dtn-surface: rgba(14, 18, 30, 0.92);
  --dtn-surface-2: rgba(18, 24, 39, 0.94);
  --dtn-line: rgba(147, 172, 219, 0.22);
  --dtn-text: #f3f6ff;
  --dtn-muted: #b4bdd2;
  --dtn-accent: #8fbfff;
  --dtn-accent-2: #c7a6ff;
  --dtn-good: #7ce29e;
  --dtn-warn: #ffd37b;
  --dtn-danger: #ff8b9f;
  color: var(--dtn-text);
  font-family: inherit;
}

.dtn-game-wrap {
  width: 100vw;
  max-width: 100vw;
  margin-left: calc(50% - 50vw);
  padding: 18px 16px 28px;
  box-sizing: border-box;
  position: relative;
  overflow-x: clip;
}

.dtn-game-wrap::before,
.dtn-game-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.dtn-game-wrap::before {
  background:
    radial-gradient(circle at 15% 20%, rgba(143, 191, 255, 0.12), transparent 28%),
    radial-gradient(circle at 85% 10%, rgba(199, 166, 255, 0.14), transparent 24%),
    radial-gradient(circle at 50% 100%, rgba(8, 12, 22, 0.75), transparent 46%);
}

.dtn-game-wrap::after {
  background: linear-gradient(180deg, rgba(4, 6, 13, 0.08), rgba(4, 6, 13, 0.3));
}

.dtn-page-shell {
  max-width: 1100px;
  margin: 0 auto 32px;
  display: grid;
  gap: 18px;
}

.dtn-page-hero,
.dtn-page-card {
  background: linear-gradient(180deg, rgba(16, 22, 37, 0.95), rgba(9, 13, 22, 0.97));
  border: 1px solid var(--dtn-line);
  border-radius: 24px;
  padding: 26px;
  box-shadow: 0 28px 80px rgba(0,0,0,0.35);
}

.dtn-page-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 18px;
}

.dtn-page-kicker,
.dtn-kicker {
  margin: 0 0 8px;
  color: var(--dtn-accent);
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .75rem;
}

.dtn-page-hero h1,
.dtn-title-copy h1,
.dtn-story-panel h2,
.dtn-stage-head h2 {
  margin: 0 0 12px;
  line-height: 1.04;
}

.dtn-page-lead { max-width: 820px; color: var(--dtn-muted); font-size: 1.05rem; }
.dtn-page-actions, .dtn-title-actions, .dtn-stage-actions, .dtn-riddle-actions, .dtn-top-actions { display:flex; flex-wrap:wrap; gap: 12px; }
.dtn-page-btn, .dtn-btn, .dtn-icon-btn {
  appearance: none;
  border: 1px solid var(--dtn-line);
  color: var(--dtn-text);
  background: linear-gradient(180deg, rgba(25, 33, 54, 0.98), rgba(13, 18, 30, 0.98));
  border-radius: 14px;
  padding: 11px 16px;
  cursor: pointer;
  text-decoration: none;
  font: inherit;
  transition: transform .16s ease, border-color .18s ease, background .18s ease;
}
.dtn-page-btn:hover, .dtn-btn:hover, .dtn-icon-btn:hover,
.dtn-page-btn:focus-visible, .dtn-btn:focus-visible, .dtn-icon-btn:focus-visible {
  outline:none;
  border-color: var(--dtn-accent);
  background: rgba(143,191,255,.16);
  transform: translateY(-1px);
}
.dtn-btn-primary, .dtn-page-btn { border-color: rgba(143,191,255,.45); box-shadow: 0 0 0 1px rgba(143,191,255,.08), 0 0 28px rgba(143,191,255,.1); }
.dtn-page-btn-ghost { background: transparent; }
.dtn-page-card-wide { grid-column: 1 / -1; }

.dtn-engine {
  width: min(1420px, 100%);
  margin: 0 auto 40px;
  position: relative;
  z-index: 1;
}

.dtn-screen-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  min-height: clamp(720px, 78vh, 920px);
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid rgba(162, 187, 238, 0.18);
  background: radial-gradient(circle at top, rgba(199, 166, 255, 0.1), transparent 28%), #04060d;
  box-shadow: 0 30px 100px rgba(0,0,0,.55);
  outline: none;
}

.dtn-screen-frame::before,
.dtn-screen-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.dtn-screen-frame::before {
  background:
    linear-gradient(180deg, rgba(255,255,255,0.03), transparent 16%),
    radial-gradient(circle at center, transparent 48%, rgba(0,0,0,0.45) 100%);
  z-index: 1;
}

.dtn-screen-frame::after {
  background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 100% 4px, 4px 100%;
  opacity: 0.08;
  mix-blend-mode: soft-light;
  z-index: 1;
}

.dtn-screen-frame:fullscreen,
.dtn-screen-frame:-webkit-full-screen {
  width: 100vw;
  height: 100vh;
  max-width: none;
  border-radius: 0;
}

.dtn-art-backdrop,
.dtn-art-backdrop img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.dtn-art-backdrop { opacity: .42; pointer-events: none; filter: saturate(1.05) contrast(1.05); }
.dtn-art-backdrop img { object-fit: cover; }

.dtn-topbar {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  background: linear-gradient(180deg, rgba(5,8,14,.8), rgba(5,8,14,0));
}
.dtn-brand { display:flex; align-items:center; gap: 14px; }
.dtn-brand strong { display:block; font-size: 1rem; }
.dtn-brand span { display:block; color: var(--dtn-muted); font-size: .82rem; }
.dtn-brand-mark { width: 40px; height: 40px; filter: drop-shadow(0 0 18px rgba(199,166,255,.3)); }

.dtn-playfield {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr) 270px;
  gap: 18px;
  padding: 10px 24px 24px;
  height: calc(100% - 76px);
}

.dtn-hud-left,
.dtn-hud-right,
.dtn-stage-shell { min-height: 0; }
.dtn-hud-left, .dtn-hud-right { display: grid; gap: 16px; align-content: start; }
.dtn-stage-shell {
  display: block;
  position: relative;
  border-radius: 24px;
  border: 1px solid rgba(162, 187, 238, 0.16);
  background: linear-gradient(180deg, rgba(11, 15, 25, .92), rgba(8, 11, 18, .95));
  overflow: hidden;
  min-height: 0;
}
.dtn-hud-card {
  border-radius: 20px;
  border: 1px solid rgba(162, 187, 238, 0.15);
  background: linear-gradient(180deg, rgba(14, 19, 31, .92), rgba(8, 11, 18, .94));
  padding: 16px;
  backdrop-filter: blur(8px);
}
.dtn-hud-card h3 { margin: 0 0 12px; font-size: .95rem; }
.dtn-stat-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.dtn-stat-grid span { display:block; color: var(--dtn-muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .08em; }
.dtn-stat-grid strong { display:block; margin-top: 4px; font-size: 1rem; }
.dtn-card-rack { display:grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.dtn-card-tile {
  aspect-ratio: 3 / 4;
  border-radius: 12px;
  border: 1px solid rgba(162,187,238,0.14);
  background: linear-gradient(180deg, rgba(29, 38, 59, .95), rgba(13, 17, 28, .98));
  display:flex; align-items:flex-end; justify-content:center;
  padding: 8px;
  text-align:center;
  font-size: .66rem;
  color: var(--dtn-muted);
}
.dtn-card-tile.is-found {
  color: var(--dtn-text);
  border-color: rgba(124,226,158,.35);
  box-shadow: 0 0 0 1px rgba(124,226,158,.08), 0 0 24px rgba(124,226,158,.08);
}
.dtn-log { display:grid; gap: 8px; max-height: 220px; overflow:auto; }
.dtn-log-entry {
  font-size: .82rem;
  color: var(--dtn-muted);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(162,187,238,0.08);
  background: rgba(255,255,255,.03);
}
.dtn-mini-list { margin: 0; padding-left: 18px; color: var(--dtn-muted); display:grid; gap:8px; }
.dtn-small { color: var(--dtn-muted); font-size: .82rem; line-height: 1.45; }
.dtn-slider-wrap { display:grid; gap: 8px; color: var(--dtn-muted); }
.dtn-slider-wrap input[type=range] { width: 100%; }

.dtn-screen {
  display: none;
  height: 100%;
  padding: 26px;
}
.dtn-screen-active { display: block; }

.dtn-title-screen,
.dtn-story-screen,
.dtn-future-screen {
  height: 100%;
  display: grid;
  place-items: center;
}
.dtn-title-screen {
  grid-template-columns: 360px 1fr;
  gap: 30px;
}
.dtn-title-art {
  border-radius: 30px;
  overflow: hidden;
  border: 1px solid rgba(162,187,238,.18);
  background: radial-gradient(circle at center, rgba(199,166,255,.14), transparent 62%), rgba(255,255,255,.02);
  padding: 26px;
}
.dtn-title-art img { width: 100%; height: auto; display:block; }
.dtn-title-copy { max-width: 620px; }
.dtn-title-copy p { color: var(--dtn-muted); font-size: 1.02rem; }

.dtn-story-panel {
  width: min(760px, 100%);
  border-radius: 26px;
  border: 1px solid rgba(162,187,238,.18);
  background: linear-gradient(180deg, rgba(16, 21, 34, .95), rgba(8, 11, 18, .98));
  padding: 28px;
  box-shadow: 0 32px 90px rgba(0,0,0,.42);
}
.dtn-story-panel-wide { width: min(940px, 100%); }
.dtn-story-panel p,
.dtn-stage-head .dtn-sub,
.dtn-feedback { color: var(--dtn-muted); }
.dtn-card-reveal, .dtn-final-secret, .dtn-code-block {
  margin-top: 16px;
  padding: 16px;
  border-radius: 18px;
  border: 1px solid rgba(162,187,238,.14);
  background: rgba(255,255,255,.03);
}
.dtn-final-secret { display:none; }
.dtn-final-secret.is-visible { display:block; border-color: rgba(124,226,158,.35); background: rgba(124,226,158,.06); }
.dtn-code-block strong { display:block; margin-top: 8px; color: var(--dtn-good); letter-spacing: .12em; font-size: 1.1rem; }

.dtn-stage-head {
  display:flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
  margin-bottom: 18px;
}
.dtn-game-view {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 18px;
  min-height: calc(100% - 108px);
}
.dtn-door-portrait,
.dtn-puzzle-zone {
  border-radius: 22px;
  border: 1px solid rgba(162,187,238,.14);
  background: linear-gradient(180deg, rgba(14, 19, 31, .9), rgba(7, 10, 17, .94));
}
.dtn-door-portrait { display:grid; place-items:center; padding: 20px; }
.dtn-door-shell {
  width: 100%;
  max-width: 220px;
  aspect-ratio: 5 / 8;
  border-radius: 22px;
  overflow: hidden;
  position: relative;
  background: radial-gradient(circle at top, rgba(199,166,255,.16), transparent 34%), linear-gradient(180deg, rgba(33, 44, 68, .95), rgba(13, 18, 30, .98));
  border: 1px solid rgba(162,187,238,.18);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.02), 0 18px 46px rgba(0,0,0,.4);
}
.dtn-door-shell.is-open { box-shadow: inset 0 0 0 1px rgba(124,226,158,.08), 0 0 36px rgba(124,226,158,.12), 0 18px 46px rgba(0,0,0,.4); }
.dtn-door-art { width: 100%; height: 100%; object-fit: cover; opacity: .85; }
.dtn-door-label {
  position:absolute; left: 14px; right: 14px; bottom: 14px;
  padding: 12px;
  border-radius: 16px;
  background: rgba(0,0,0,.42);
  border: 1px solid rgba(255,255,255,.08);
}
.dtn-door-label span { display:block; color: var(--dtn-muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .12em; }
.dtn-door-label strong { display:block; margin-top: 4px; }

.dtn-puzzle-zone { padding: 18px; display:grid; align-content:start; box-shadow: inset 0 1px 0 rgba(255,255,255,.03); }
.dtn-grid-pair { display:grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.dtn-grid-card, .dtn-riddle-card {
  border-radius: 18px;
  border: 1px solid rgba(162,187,238,.12);
  background: rgba(255,255,255,.03);
  padding: 16px;
}
.dtn-grid-card h3, .dtn-riddle-card h3 { margin-top: 0; }
.dtn-grid { display:grid; gap: 8px; margin-top: 12px; }
.dtn-tile {
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  border: 1px solid rgba(162,187,238,.16);
  background: #202a40;
}
button.dtn-tile { cursor:pointer; padding: 0; }
button.dtn-tile:hover, button.dtn-tile:focus-visible { outline:none; transform: translateY(-1px); border-color: var(--dtn-accent); box-shadow: 0 0 0 1px rgba(143,191,255,0.12), 0 0 20px rgba(143,191,255,0.12); }
.dtn-tile.is-on { background: linear-gradient(180deg, #94c3ff, #6f99ff); box-shadow: 0 0 24px rgba(143,191,255,.22); }
.dtn-riddle-mask {
  margin: 12px 0;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px dashed rgba(143,191,255,.28);
  background: rgba(143,191,255,.06);
  letter-spacing: .28em;
  font-weight: 700;
}
.dtn-riddle-bank { display:flex; flex-wrap:wrap; gap: 8px; margin-bottom: 12px; }
.dtn-letter {
  appearance:none; cursor:pointer; font:inherit; font-weight:600;
  padding: 8px 10px; min-width: 42px; border-radius: 10px;
  border: 1px solid rgba(162,187,238,.18); background: rgba(143,191,255,.08); color: var(--dtn-text);
}
.dtn-letter:hover, .dtn-letter:focus-visible { outline:none; background: rgba(143,191,255,.16); border-color: var(--dtn-accent); }
.dtn-riddle-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(162,187,238,.18);
  background: #0b111c;
  color: var(--dtn-text);
  margin-bottom: 12px;
}
.dtn-feedback.is-warn { color: var(--dtn-warn); }
.dtn-feedback.is-danger { color: var(--dtn-danger); }
.dtn-feedback.is-good { color: var(--dtn-good); }

.dtn-future-list { display:grid; gap: 12px; margin-top: 16px; }
.dtn-future-item {
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(162,187,238,.14);
  background: rgba(255,255,255,.035);
}
.dtn-future-item strong { display:block; margin-bottom: 8px; }
.dtn-ending-stats { display:grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; margin-top: 16px; }
.dtn-ending-stats div {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid rgba(162,187,238,.14);
  background: rgba(255,255,255,.03);
}
.dtn-ending-stats span { display:block; color: var(--dtn-muted); font-size: .76rem; text-transform: uppercase; letter-spacing: .08em; }
.dtn-ending-stats strong { display:block; margin-top: 4px; }

@media (max-width: 1240px) {
  .dtn-playfield { grid-template-columns: 230px minmax(0, 1fr) 230px; }
}
@media (max-width: 1080px) {
  .dtn-game-wrap { padding-left: 12px; padding-right: 12px; }
  .dtn-page-grid,
  .dtn-playfield,
  .dtn-title-screen,
  .dtn-game-view,
  .dtn-grid-pair { grid-template-columns: 1fr; }
  .dtn-screen-frame { aspect-ratio: auto; min-height: 980px; }
  .dtn-hud-left, .dtn-hud-right { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 720px) {
  .dtn-page-grid,
  .dtn-hud-left,
  .dtn-hud-right,
  .dtn-ending-stats,
  .dtn-stat-grid { grid-template-columns: 1fr; }
  .dtn-screen, .dtn-page-hero, .dtn-page-card { padding: 18px; }
  .dtn-screen-frame { min-height: 1120px; border-radius: 20px; }
  .dtn-topbar, .dtn-playfield { padding-left: 14px; padding-right: 14px; }
}