:root {
  --bg: #0c0f17;
  --bg2: #121726;
  --panel: #161c2e;
  --panel2: #1d2640;
  --line: #283150;
  --ink: #eef2ff;
  --muted: #93a0c4;
  --faint: #5e6b92;
  --accent: #33e1c4;
  --accent2: #0b6b6b;
  --good: #56e39f;
  --bad: #ff6b81;
  --radius: 16px;
  --cell: 46px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(51, 225, 196, 0.10), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(185, 140, 255, 0.10), transparent 55%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.wrap { max-width: 1100px; margin: 0 auto; padding: 22px 18px 64px; }

/* ---------- Home ---------- */
.site-head { display: flex; align-items: center; gap: 14px; padding: 8px 2px 26px; }
.site-head .mark {
  width: 46px; height: 46px; color: var(--accent);
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  display: grid; place-items: center; box-shadow: var(--shadow);
}
.site-head .mark svg { width: 28px; height: 28px; }
.site-head h1 { font-size: 1.5rem; margin: 0; letter-spacing: -0.02em; }
.site-head p { margin: 2px 0 0; color: var(--muted); font-size: 0.92rem; }

.hero {
  background: linear-gradient(135deg, var(--panel), var(--bg2));
  border: 1px solid var(--line); border-radius: 22px;
  padding: 26px; margin-bottom: 26px; box-shadow: var(--shadow);
}
.hero h2 { margin: 0 0 8px; font-size: clamp(1.4rem, 4.5vw, 2.1rem); letter-spacing: -0.02em; }
.hero p { margin: 0; color: var(--muted); max-width: 60ch; line-height: 1.5; }
.hero .badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.badge {
  font-size: 0.78rem; color: var(--muted); background: var(--bg);
  border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px;
}

.grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}
.card {
  position: relative; display: flex; flex-direction: column; gap: 12px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 18px;
  padding: 18px; min-height: 150px; overflow: hidden;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.card:hover, .card:focus-visible { transform: translateY(-4px); border-color: var(--ac); box-shadow: var(--shadow); }
.card .glow {
  position: absolute; inset: -40% 40% auto -30%; height: 140px; filter: blur(38px);
  background: radial-gradient(circle, var(--ac), transparent 70%); opacity: 0.5; pointer-events: none;
}
.card .ico {
  width: 50px; height: 50px; color: var(--ac); border-radius: 14px;
  background: color-mix(in srgb, var(--ac) 14%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--ac) 35%, var(--line));
  display: grid; place-items: center;
}
.card .ico svg { width: 30px; height: 30px; }
.card h3 { margin: 0; font-size: 1.18rem; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.45; flex: 1; }
.card .meta { display: flex; align-items: center; justify-content: space-between; }
.card .prog { font-size: 0.78rem; color: var(--faint); }
.card .prog b { color: var(--ac); }
.card .go { font-size: 0.82rem; color: var(--ac); font-weight: 600; }

footer.foot { color: var(--faint); font-size: 0.82rem; text-align: center; margin-top: 40px; }

/* ---------- Game page ---------- */
.gwrap { min-height: 100dvh; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.iconbtn {
  width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--panel); color: var(--ink); display: grid; place-items: center; flex: none;
}
.iconbtn svg { width: 20px; height: 20px; }
.iconbtn:active { transform: scale(0.94); }
.topbar .title { display: flex; align-items: center; gap: 10px; min-width: 0; }
.topbar .title .ico { width: 34px; height: 34px; color: var(--ac); display: grid; place-items: center; flex: none; }
.topbar .title .ico svg { width: 24px; height: 24px; }
.topbar .title h1 { font-size: 1.15rem; margin: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar .title small { display: block; color: var(--muted); font-size: 0.72rem; font-weight: 400; }
.topbar .spacer { flex: 1; }

.levels {
  display: flex; gap: 8px; overflow-x: auto; padding: 12px 16px; scrollbar-width: none;
  border-bottom: 1px solid var(--line);
}
.levels::-webkit-scrollbar { display: none; }
.levels .grp { font-size: 0.7rem; color: var(--faint); align-self: center; padding: 0 2px; text-transform: uppercase; letter-spacing: 0.08em; }
.lvl {
  flex: none; width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--panel); color: var(--muted); font-weight: 700; font-size: 1rem; position: relative;
}
.lvl.active { background: var(--ac); color: #06121a; border-color: var(--ac); }
.lvl.done::after {
  content: "✓"; position: absolute; top: -6px; right: -6px; width: 18px; height: 18px;
  background: var(--good); color: #062417; border-radius: 50%; font-size: 0.7rem;
  display: grid; place-items: center; border: 2px solid var(--bg);
}

.play { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 18px; padding: 22px 14px 40px; }

.boardbox { display: grid; place-items: center; }
.board {
  display: grid; gap: 4px; touch-action: manipulation; user-select: none;
}
.glabel {
  display: grid; place-items: center; color: var(--muted);
  font-weight: 700; font-size: calc(var(--cell) * 0.4); min-width: calc(var(--cell) * 0.78);
}
.cell {
  width: var(--cell); height: var(--cell); border-radius: calc(var(--cell) * 0.18);
  border: 1px solid var(--line); background: var(--panel2); color: var(--ink);
  display: grid; place-items: center; position: relative; padding: 0;
  font-weight: 700; font-size: calc(var(--cell) * 0.46); line-height: 1;
  transition: background 0.12s ease, transform 0.06s ease, color 0.12s ease;
}
.cell:active { transform: scale(0.92); }
.cell.locked { cursor: default; }
.cell.blocked { background: #0a0d16; border-color: #0a0d16; }

/* toggle (binary) */
.cell.on { background: var(--ac); border-color: var(--ac); color: #06121a; box-shadow: 0 0 16px -4px var(--ac); }
.cell .clue { color: var(--faint); font-size: calc(var(--cell) * 0.4); font-weight: 700; }
.cell.on .clue { color: rgba(4, 18, 22, 0.72); }
.cell.locked.on { box-shadow: inset 0 0 0 3px rgba(4, 18, 22, 0.35), 0 0 16px -4px var(--ac); }
.cell.locked::before {
  content: ""; position: absolute; top: 4px; right: 4px; width: 5px; height: 5px;
  border-radius: 50%; background: var(--ac); opacity: 0.85;
}
/* flagged "definitely empty" cell: hatched fill + a small corner flag, so a
   centred clue number (Pulse) stays readable */
.cell.mark {
  background:
    repeating-linear-gradient(45deg, var(--panel2), var(--panel2) 5px, #1b2238 5px, #1b2238 10px);
  border-color: color-mix(in srgb, var(--ac) 30%, var(--line));
}
.cell.mark::after {
  content: "⚑"; position: absolute; top: 1px; left: 4px;
  color: var(--ac); font-size: calc(var(--cell) * 0.36); font-weight: 700; line-height: 1; opacity: 0.95;
}
.cell.mark .clue { color: var(--muted); }

/* number / color */
.cell.lockednum { background: color-mix(in srgb, var(--ac) 16%, var(--panel2)); border-color: color-mix(in srgb, var(--ac) 40%, var(--line)); }
.cell.peak { box-shadow: inset 0 0 0 3px color-mix(in srgb, var(--ac) 70%, transparent); border-radius: 50%; }
.cell.swatch { color: transparent; }
.cell.swatch.locked2 { box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.35); }
.cell .v { position: relative; z-index: 1; }

.cell.bad { animation: shake 0.3s; }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-4px)} 75%{transform:translateX(4px)} }

/* input + controls */
.inputbar { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; max-width: 520px; }
.pen {
  min-width: 46px; height: 46px; padding: 0 12px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--panel); color: var(--ink); font-weight: 800; font-size: 1.1rem; position: relative;
}
.pen.active { border-color: var(--ac); box-shadow: 0 0 0 2px color-mix(in srgb, var(--ac) 55%, transparent); }
.pen .sw { width: 22px; height: 22px; border-radius: 6px; display: inline-block; vertical-align: middle; }
.pen.erase { color: var(--muted); }
.pen.tool { display: inline-flex; align-items: center; gap: 8px; padding: 0 18px; font-size: 0.95rem; color: var(--muted); }
.pen.tool svg { width: 18px; height: 18px; }
.pen.tool.active { color: var(--ac); }

.controls { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 7px; height: 44px; padding: 0 16px;
  border-radius: 12px; border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  font-weight: 600; font-size: 0.92rem;
}
.btn svg { width: 18px; height: 18px; }
.btn:active { transform: scale(0.96); }
.btn.on { border-color: var(--ac); color: var(--ac); }
.btn.primary { background: var(--ac); color: #06121a; border-color: var(--ac); }

.hint-msg { color: var(--muted); font-size: 0.88rem; min-height: 1.2em; text-align: center; }

/* modal */
.modal {
  position: fixed; inset: 0; background: rgba(4, 6, 12, 0.7); z-index: 20;
  display: none; place-items: center; padding: 20px; backdrop-filter: blur(4px);
}
.modal.show { display: grid; }
.sheet {
  background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 24px;
  max-width: 460px; width: 100%; box-shadow: var(--shadow); animation: rise 0.25s ease;
}
@keyframes rise { from { transform: translateY(16px); opacity: 0; } to { transform: none; opacity: 1; } }
.sheet h2 { margin: 0 0 6px; display: flex; align-items: center; gap: 10px; }
.sheet h2 .ico { color: var(--ac); width: 30px; height: 30px; display: grid; place-items: center; }
.sheet ol, .sheet ul { margin: 12px 0 0; padding-left: 20px; color: var(--muted); line-height: 1.55; }
.sheet li { margin-bottom: 8px; }
.sheet .row { display: flex; gap: 10px; margin-top: 20px; }
.sheet .row .btn { flex: 1; justify-content: center; }

.win .sheet { text-align: center; }
.win .big { font-size: 3rem; }
.win h2 { justify-content: center; }
.win p { color: var(--muted); }

@media (max-width: 520px) {
  .wrap { padding: 16px 14px 56px; }
  .hero { padding: 20px; }
  .topbar { padding: 10px 12px; }
  .levels { padding: 10px 12px; }
}