:root {
  --bg: #0b0d1a;
  --bg2: #141833;
  --panel: #1b2044;
  --panel2: #232a5c;
  --line: #2c3370;
  --text: #e8ebff;
  --muted: #8a91c4;
  --accent: #39f3c8;
  --danger: #ff5f6d;
  --shape0: #39f3c8; /* small square */
  --shape1: #ffb547; /* horizontal bar */
  --shape2: #5aa8ff; /* vertical bar */
  --shape3: #ff5fa2; /* big square */
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  background: radial-gradient(120% 80% at 50% 0%, var(--bg2), var(--bg)) fixed;
  background-color: var(--bg);
  color: var(--text);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overscroll-behavior: none;
  user-select: none;
  -webkit-user-select: none;
}
button {
  font: inherit; color: var(--text); background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; padding: 10px 16px; cursor: pointer;
}
button:active { transform: scale(0.96); }
button:disabled { opacity: 0.35; }
button.primary { background: var(--accent); color: #06221b; border-color: transparent; font-weight: 700; }
.screen {
  height: 100%; display: flex; flex-direction: column;
  padding: calc(env(safe-area-inset-top) + 12px) 16px calc(env(safe-area-inset-bottom) + 12px + var(--banner-h, 0px));
  max-width: 560px; margin: 0 auto;
}
.screen[hidden] { display: none; }

/* Home */
.title { text-align: center; margin: 8px 0 14px; }
.title h1 { margin: 6px 0 0; font-size: 38px; letter-spacing: 4px; font-weight: 900; }
.title h1 span { color: var(--accent); text-shadow: 0 0 18px #39f3c880; }
.title p { margin: 2px 0 0; color: var(--muted); }
.logo { display: inline-grid; grid-template-columns: 14px 28px; grid-template-rows: 28px 14px; gap: 5px; }
.logo span { border-radius: 4px; box-shadow: 0 0 12px currentColor; }
.logo .b2 { background: var(--shape2); color: var(--shape2); }
.logo .b3 { background: var(--shape3); color: var(--shape3); }
.logo .b0 { background: var(--shape0); color: var(--shape0); }
.logo .b1 { background: var(--shape1); color: var(--shape1); }
.logo .b2 { grid-area: 1 / 1; } .logo .b3 { grid-area: 1 / 2; } .logo .b0 { grid-area: 2 / 1; } .logo .b1 { grid-area: 2 / 2; }
.modes { flex: 1; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; padding-bottom: 8px; }
.mode {
  display: flex; align-items: center; gap: 14px; text-align: left; padding: 14px;
  border-radius: 16px; background: linear-gradient(135deg, var(--panel), #161a3a);
}
.mode .glyph { width: 46px; height: 46px; flex: none; border-radius: 12px; display: grid; place-items: center; font-size: 22px; font-weight: 800; color: #0b0d1a; }
.mode .info { flex: 1; min-width: 0; }
.mode .name { font-weight: 800; font-size: 17px; }
.mode .desc { color: var(--muted); font-size: 13px; }
.mode.locked .glyph { filter: grayscale(1); opacity: 0.45; }
.mode.locked .name, .mode.locked .desc { opacity: 0.55; }
.mode .meta { font-size: 13px; color: var(--shape1); text-align: right; white-space: nowrap; }
.home-foot { display: flex; gap: 10px; }
.home-foot button { flex: 1; }

/* Level select */
.levels { flex: 1; overflow-y: auto; padding: 4px 0 8px; }
.world-title { margin: 14px 0 8px; font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: var(--muted); }
.world-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.world-grid button { aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 2px; border-radius: 12px; }
.world-grid .num { font-size: 20px; font-weight: 800; }
.world-grid .lvl-stars { font-size: 10px; color: var(--shape1); min-height: 14px; letter-spacing: 1px; }
.world-grid button.done { border-color: var(--accent); }
.world-grid button.sealed { border-color: var(--shape3); box-shadow: inset 0 0 12px #ff5fa244; }

/* Game */
.hud { display: flex; align-items: center; gap: 10px; }
.hud-title { flex: 1; text-align: center; min-width: 0; }
#level-name, #levels-title { font-weight: 800; font-size: 18px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.stats { color: var(--muted); font-size: 14px; }
button.icon { width: 46px; height: 46px; padding: 0; font-size: 24px; flex: none; }
.icon-spacer { width: 46px; flex: none; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; min-height: 30px; margin-top: 8px; }
.chip { background: #ffffff0d; border: 1px solid #ffffff14; border-radius: 999px; padding: 3px 10px; font-size: 14px; font-variant-numeric: tabular-nums; }
.chip.hearts { color: var(--danger); letter-spacing: 2px; }
.chip.warn { color: var(--danger); border-color: #ff5f6d66; }
.chip.timer { font-weight: 800; }
.board-wrap { position: relative; flex: 1; min-height: 0; display: flex; align-items: center; justify-content: center; touch-action: none; padding: 8px 0; }
#board { display: block; touch-action: none; }
.toast {
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  background: #000c; border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px;
  font-weight: 700; pointer-events: none; animation: toast 1.4s ease forwards; white-space: nowrap;
}
.toast[hidden] { display: none; }
@keyframes toast { 0% { opacity: 0; transform: translate(-50%, -6px); } 12%, 75% { opacity: 1; transform: translate(-50%, 0); } 100% { opacity: 0; } }
.hint { min-height: 2.8em; margin: 0 0 8px; text-align: center; color: var(--muted); font-size: 14px; }
.pad { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; }
.tools { display: flex; flex-direction: column; gap: 6px; }
.tools button { min-width: 96px; padding: 8px 12px; }
.tools button[hidden] { display: none; }
.dpad { display: grid; grid-template-columns: repeat(3, 52px); grid-template-rows: repeat(2, 52px); gap: 6px; }
.dpad[hidden] { display: none; }
.dpad button { padding: 0; font-size: 18px; }
.dpad [data-dir=up] { grid-column: 2; grid-row: 1; }
.dpad [data-dir=left] { grid-column: 1; grid-row: 2; }
.dpad [data-dir=down] { grid-column: 2; grid-row: 2; }
.dpad [data-dir=right] { grid-column: 3; grid-row: 2; }

/* Modal */
.overlay { position: fixed; inset: 0; background: #050610b3; display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 10; }
.overlay[hidden] { display: none; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 22px; text-align: center; width: min(380px, 100%); max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px #000a; animation: pop 0.22s ease; }
@keyframes pop { from { transform: scale(0.92); opacity: 0; } }
.card h2 { margin: 0 0 8px; font-size: 26px; }
#modal-body { color: var(--muted); }
#modal-body b { color: var(--text); }
.card .row { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 16px; }
.card .row button { flex: 1 1 40%; }
.stars { font-size: 36px; color: var(--shape1); letter-spacing: 6px; }
.stars .off { color: #ffffff22; }
.big-number { font-size: 44px; font-weight: 900; color: var(--text); line-height: 1.1; }
.perks { display: flex; flex-direction: column; gap: 8px; text-align: left; margin-top: 10px; }
.perks button { display: flex; gap: 12px; align-items: center; text-align: left; padding: 12px; }
.perks .p-icon { font-size: 24px; width: 32px; text-align: center; }
.perks .p-name { font-weight: 800; color: var(--text); }
.perks .p-text { font-size: 13px; color: var(--muted); }
.settings { display: flex; flex-direction: column; gap: 10px; text-align: left; margin-top: 8px; }
.settings label { display: flex; justify-content: space-between; align-items: center; background: #ffffff08; border-radius: 12px; padding: 12px; color: var(--text); }
.settings input { width: 22px; height: 22px; accent-color: var(--accent); }
.howto { display: flex; gap: 14px; align-items: center; text-align: left; }
.howto svg { width: 96px; flex: none; }
.howto ul { margin: 0; padding-left: 18px; font-size: 14px; }
.howto .slot { fill: #ffffff10; stroke: #ffffff30; }
.howto .b0 { fill: var(--shape0); } .howto .b1 { fill: var(--shape1); }
.howto .b2 { fill: var(--shape2); } .howto .b3 { fill: var(--shape3); }
.howto .arrow { stroke: var(--text); stroke-width: 3; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.legend { list-style: none; padding: 0; margin: 14px 0 0; text-align: left; font-size: 14px; display: flex; flex-direction: column; gap: 8px; }
.legend li { display: flex; gap: 10px; align-items: center; }
.legend i { width: 22px; height: 22px; border-radius: 5px; flex: none; }
.howto-key { text-align: left; font-size: 14px; margin: 12px 0 0; }
.howto-key .t-wall { display: inline-block; width: 14px; height: 14px; vertical-align: -2px; }
.t-wall { background: #6b74c9; border-radius: 4px; box-shadow: 0 3px 0 #0b0e24; }
.t-shape { background: #ffb54740; border: 1.5px solid #ffb547; box-shadow: inset 0 0 0 6px #ffb54700; position: relative; }
.t-crack { background: linear-gradient(135deg, transparent 46%, var(--shape3) 46% 54%, transparent 54%) center / 11px 11px no-repeat, #232a5c; border: 1.5px solid #323b80; position: relative; }
.t-crack::after { content: ''; position: absolute; inset: 5px; border: 1.5px solid var(--shape3); border-radius: 2px; }
.t-switch { background: #232a5c; border: 1.5px solid #323b80; box-shadow: inset 0 0 0 5px #232a5c, inset 0 0 0 8px #8b7bff; border-radius: 50% !important; }
.t-heavy { background: #232a5c; border: 4px solid #8b7bff; border-radius: 50% !important; }
.t-bridge { background: #3a2f6b; border: 1.5px solid #8b7bff; }

/* Tutorial coach */
.coach {
  position: relative; margin: 8px 0 0; padding: 12px 14px; border-radius: 16px;
  background: linear-gradient(135deg, #2b2f6e, #1d2150); border: 1px solid #5a63c9;
  box-shadow: 0 8px 24px #0006; font-size: 15px; line-height: 1.35;
  animation: coach-in 0.25s ease;
}
.coach[hidden] { display: none; }
.coach::after {
  content: ''; position: absolute; left: 50%; bottom: -8px; width: 14px; height: 14px;
  background: #1f2354; border-right: 1px solid #5a63c9; border-bottom: 1px solid #5a63c9;
  transform: translateX(-50%) rotate(45deg);
}
.coach.nudge { animation: coach-nudge 0.35s ease; }
.coach-dots { display: flex; gap: 5px; justify-content: center; margin-top: 8px; }
.coach-dots span { width: 6px; height: 6px; border-radius: 50%; background: #ffffff33; }
.coach-dots span.on { background: var(--accent); }
@keyframes coach-in { from { opacity: 0; transform: translateY(-6px); } }
@keyframes coach-nudge { 25% { transform: translateX(-6px); } 50% { transform: translateX(6px); } 75% { transform: translateX(-3px); } }
.dpad button.coach-pulse { border-color: var(--accent); box-shadow: 0 0 0 0 #39f3c8aa; animation: pad-pulse 1.1s ease infinite; }
@keyframes pad-pulse { 0% { box-shadow: 0 0 0 0 #39f3c8aa; } 100% { box-shadow: 0 0 0 12px #39f3c800; } }

.settings .about { text-align: center; color: var(--muted); font-size: 13px; margin: 6px 0 0; }
.settings .about a { color: var(--accent); }

/* Brand splash */
.brand {
  position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center;
  background: radial-gradient(90% 60% at 50% 45%, #171b3d, var(--bg)); transition: opacity 0.45s ease;
}
.brand[hidden] { display: none; }
.brand.out { opacity: 0; pointer-events: none; }
.brand-inner { text-align: center; animation: brand-in 0.9s cubic-bezier(.2,.8,.2,1) both; }
.brand-mark { width: 72px; height: 72px; filter: drop-shadow(0 0 14px #ff5fa255); }
.brand-name { margin-top: 14px; font-size: 30px; font-weight: 900; letter-spacing: 6px; color: var(--text); }
.brand-name span { margin-left: 10px; color: var(--accent); text-shadow: 0 0 18px #39f3c880; }
.brand-sub { margin-top: 6px; font-size: 13px; letter-spacing: 4px; text-transform: uppercase; color: var(--muted); animation: brand-in 0.9s 0.35s both; }
@keyframes brand-in { from { opacity: 0; transform: translateY(10px) scale(0.96); } }

/* Short screens (small phones): a more compact home header. */
@media (max-height: 700px) {
  .title { margin: 0 0 8px; }
  .title h1 { font-size: 30px; }
  .logo { grid-template-columns: 10px 20px; grid-template-rows: 20px 10px; gap: 4px; }
  .mode { padding: 10px 12px; }
  .mode .glyph { width: 38px; height: 38px; font-size: 18px; }
}

/* No on-screen arrows (the app, or turned off): tool buttons in one row across the bottom. */
.pad.no-dpad .tools { flex-direction: row; width: 100%; }
.pad.no-dpad .tools button { flex: 1; min-width: 0; height: 52px; }
.coach-dots[hidden] { display: none; }