/* Kind Puzzles */
:root {
  --bg: #FAF6EF;
  --bg2: #F2EBDF;
  --card: #FFFFFF;
  --ink: #1F1B16;
  --ink2: #5D554B;
  --ink3: #8D8478;
  --line: #E6DDCF;
  --accent: #E0533D;
  --accent-ink: #FFFFFF;
  --good: #1F8A70;
  --bad: #D93A2B;
  --focus: #2F6FE4;
  --cell-line: rgba(31, 27, 22, .16);
  --region-line: #2A241D;
  --shadow: 0 1px 2px rgba(40, 30, 20, .06), 0 6px 24px rgba(40, 30, 20, .07);
  --sun: #F2A516;
  --moon: #4F73D9;
  --trail: #E0533D;
  --trail-cell: #FCE3DC;
  --num-bg: #1F1B16;
  --num-ink: #FFFFFF;
  /* Queens region colours */
  --r0: #F8C9A4; --r1: #B9DCF5; --r2: #CDE8B5; --r3: #F4B7C6; --r4: #E1CFF2;
  --r5: #FCE49A; --r6: #A9E2DA; --r7: #F39A9A; --r8: #CFD6E2; --r9: #E9D7B8; --r10: #C3E1A0;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17140F; --bg2: #201C16; --card: #241F19; --ink: #F3EDE4; --ink2: #C3B9AB; --ink3: #8F8576;
    --line: #3A332A; --accent: #F06A52; --good: #46C39E; --bad: #FF6B5A; --focus: #7AA7FF;
    --cell-line: rgba(255, 255, 255, .14); --region-line: #0A0806;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .3);
    --sun: #FFB938; --moon: #8EA9FF; --trail: #F06A52; --trail-cell: #4A2B24; --num-bg: #F3EDE4; --num-ink: #17140F;
    --r0: #8A5A3A; --r1: #3C6585; --r2: #4D6E3A; --r3: #86475A; --r4: #634C80;
    --r5: #85702A; --r6: #2F7168; --r7: #8C3B78; --r8: #4F5A6E; --r9: #6E5E42; --r10: #4F6E2F;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #17140F; --bg2: #201C16; --card: #241F19; --ink: #F3EDE4; --ink2: #C3B9AB; --ink3: #8F8576;
  --line: #3A332A; --accent: #F06A52; --good: #46C39E; --bad: #FF6B5A; --focus: #7AA7FF;
  --cell-line: rgba(255, 255, 255, .14); --region-line: #0A0806;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .3);
  --sun: #FFB938; --moon: #8EA9FF; --trail: #F06A52; --trail-cell: #4A2B24; --num-bg: #F3EDE4; --num-ink: #17140F;
  --r0: #8A5A3A; --r1: #3C6585; --r2: #4D6E3A; --r3: #86475A; --r4: #634C80;
  --r5: #85702A; --r6: #2F7168; --r7: #8C3B78; --r8: #4F5A6E; --r9: #6E5E42; --r10: #4F6E2F;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img, svg { display: block; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* ---------- header ---------- */
.top {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; gap: 12px; height: 60px; }
.logo { display: flex; align-items: center; gap: 9px; text-decoration: none; font-weight: 800; font-size: 18px; letter-spacing: -.01em; white-space: nowrap; }
.logo-mark { width: 30px; height: 30px; }
.nav { display: flex; gap: 2px; margin-left: 10px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { text-decoration: none; padding: 7px 11px; border-radius: 10px; color: var(--ink2); font-weight: 600; font-size: 15px; white-space: nowrap; }
.nav a:hover { background: var(--bg2); color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--bg2); }
.top-actions { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 11px; border: 1px solid var(--line); background: var(--card);
  display: inline-grid; place-items: center; cursor: pointer;
}
.icon-btn svg { width: 19px; height: 19px; }
.icon-btn:hover { border-color: var(--ink3); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  min-height: 42px; padding: 0 16px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); font-weight: 650; font-size: 15px;
  text-decoration: none; cursor: pointer; transition: transform .08s, border-color .15s, background .15s;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover { border-color: var(--ink3); }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .45; cursor: default; transform: none; }
.btn svg { width: 18px; height: 18px; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.05); }
.btn.tip { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); color: var(--accent); }
.btn.small { min-height: 36px; padding: 0 12px; font-size: 14px; border-radius: 10px; }

/* ---------- home ---------- */
.hero { padding: 44px 0 18px; text-align: center; }
.hero h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.08; letter-spacing: -.03em; margin: 0 0 14px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { font-size: clamp(16px, 2.4vw, 19px); color: var(--ink2); max-width: 620px; margin: 0 auto; }
.chips { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.chip { font-size: 13.5px; font-weight: 600; color: var(--ink2); background: var(--card); border: 1px solid var(--line); padding: 5px 11px; border-radius: 99px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 26px 0 10px; }
.card {
  position: relative; display: flex; flex-direction: column; gap: 10px;
  background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 18px;
  text-decoration: none; box-shadow: var(--shadow); transition: transform .15s, border-color .15s;
}
.card:hover { transform: translateY(-3px); border-color: var(--ink3); }
.card .art { aspect-ratio: 1.55; border-radius: 14px; overflow: hidden; background: var(--bg2); display: grid; place-items: center; }
.card .art svg { width: 100%; height: 100%; }
.card h2 { margin: 2px 0 0; font-size: 22px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--ink2); font-size: 15px; }
.card-status { font-size: 14px; font-weight: 600; color: var(--ink3); min-height: 21px; }
.card-status .ok { color: var(--good); }
.card-status .streak { margin-left: 6px; }
.card .go { margin-top: auto; }
.card.done .go { background: var(--card); color: var(--ink); border-color: var(--line); }

.section { margin: 40px auto; max-width: 760px; }
.section h2 { font-size: 26px; letter-spacing: -.02em; margin: 0 0 12px; }
.section h3 { font-size: 18px; margin: 22px 0 6px; }
.section p, .section li { color: var(--ink2); }
.section ul, .section ol { padding-left: 22px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 0 16px; margin: 8px 0; }
.faq summary { cursor: pointer; font-weight: 650; padding: 14px 0; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-size: 20px; line-height: 1; color: var(--ink3); }
.faq details[open] summary::after { content: '–'; }
.faq details p { margin: 0 0 14px; }

.tip-band {
  display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; margin: 30px auto; max-width: 760px;
}
.tip-band p { margin: 0; color: var(--ink2); flex: 1 1 280px; }
.tip-band strong { color: var(--ink); }

/* ---------- game page ---------- */
.game-head { text-align: center; padding: 22px 0 6px; }
.game-head h1 { font-size: clamp(26px, 4.6vw, 36px); letter-spacing: -.025em; margin: 0; line-height: 1.15; }
.game-head p { margin: 6px 0 0; color: var(--ink2); }

.play { max-width: 560px; margin: 0 auto; }
.modes { display: flex; justify-content: center; gap: 4px; background: var(--bg2); padding: 4px; border-radius: 14px; width: max-content; margin: 14px auto 12px; }
.mode-tab { border: 0; background: transparent; padding: 8px 16px; border-radius: 10px; font-weight: 700; font-size: 15px; color: var(--ink2); cursor: pointer; }
.mode-tab[aria-selected="true"] { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

.bar { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; min-height: 38px; }
.timer { font-variant-numeric: tabular-nums; font-weight: 750; font-size: 20px; min-width: 64px; display: flex; align-items: center; gap: 6px; }
.timer svg { width: 18px; height: 18px; color: var(--ink3); }
.size-wrap { margin-left: auto; }
.size-wrap select {
  font: inherit; font-size: 14.5px; font-weight: 600; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; padding: 7px 30px 7px 10px; appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238D8478' stroke-width='3'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
}
.daily-note { margin-left: auto; font-size: 14px; color: var(--ink3); font-weight: 600; }
body[data-mode="unlimited"] .daily-note { display: none; }

.board-wrap { position: relative; }
.board {
  position: relative; display: grid;
  grid-template-columns: repeat(var(--n), minmax(0, 1fr));
  grid-template-rows: repeat(var(--n), minmax(0, 1fr));
  aspect-ratio: 1; width: 100%; border-radius: 14px; overflow: hidden;
  background: var(--card); box-shadow: var(--shadow); border: 3px solid var(--region-line);
  touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none;
}
.board:focus-visible { outline-offset: 4px; }
.gen { position: absolute; inset: 0; display: grid; place-items: center; color: var(--ink3); font-weight: 600; }
.board .cell { position: relative; display: grid; place-items: center; min-width: 0; min-height: 0; cursor: pointer; padding: 0; border: 0; background: transparent; }

/* Queens */
.queens { border-color: var(--region-line); }
.queens .cell { background: var(--rc); box-shadow: inset 0 0 0 .5px var(--cell-line); }
.queens .cell.bt { border-top: 2.5px solid var(--region-line); }
.queens .cell.bb { border-bottom: 2.5px solid var(--region-line); }
.queens .cell.bl { border-left: 2.5px solid var(--region-line); }
.queens .cell.br { border-right: 2.5px solid var(--region-line); }
.queens .cell:first-child, .queens .cell { margin: 0; }
.queens .cell svg { width: 62%; height: auto; aspect-ratio: 1; color: #1F1B16; filter: drop-shadow(0 1px 0 rgba(255,255,255,.4)); }
:root[data-theme="dark"] .queens .cell svg { color: #FFF4E0; filter: none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .queens .cell svg { color: #FFF4E0; filter: none; } }
.queens .xm { font-size: calc(min(560px, 100vw) / var(--n) * .42); line-height: 1; font-weight: 500; color: rgba(31, 27, 22, .5); }
:root[data-theme="dark"] .queens .xm { color: rgba(255, 255, 255, .55); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .queens .xm { color: rgba(255, 255, 255, .55); } }
.queens .cell.bad { background-image: repeating-linear-gradient(135deg, rgba(217, 58, 43, .5) 0 5px, transparent 5px 10px); }
.queens .cell.bad svg { color: var(--bad); }
.board .cell.kfocus { outline: 3px solid var(--focus); outline-offset: -4px; z-index: 2; }

/* Sun & Moon */
.sunmoon { border: 2px solid var(--line); background: var(--card); }
.sunmoon .cell { box-shadow: inset 0 0 0 .5px var(--line); background: var(--card); }
.sunmoon .cell.given { background: var(--bg2); cursor: default; }
.sunmoon .cell svg { width: 60%; height: auto; aspect-ratio: 1; pointer-events: none; }
.sunmoon .cell svg.sun { color: var(--sun); }
.sunmoon .cell svg.moon { color: var(--moon); }
.sunmoon .cell.bad { background-image: repeating-linear-gradient(135deg, rgba(217, 58, 43, .22) 0 5px, transparent 5px 10px); }
.sunmoon .cell:focus-visible { outline-offset: -4px; z-index: 2; }
.rel {
  position: absolute; z-index: 3; transform: translate(-50%, -50%);
  width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center;
  background: var(--card); color: var(--ink); font-weight: 800; font-size: 17px; line-height: 1;
  box-shadow: 0 0 0 2px var(--ink3); pointer-events: none;
}
.rel.bad { color: #fff; background: var(--bad); box-shadow: none; }

/* Number Path */
.npath { border: 2px solid var(--line); background: var(--card); }
.npath .cell { box-shadow: inset 0 0 0 .5px var(--line); transition: background .12s; }
.npath .cell.on { background: var(--trail-cell); }
.npath .cell.wr::after, .npath .cell.wb::before {
  content: ''; position: absolute; z-index: 5; background: var(--ink); border-radius: 3px; pointer-events: none;
}
.npath .cell.wr::after { top: -3px; bottom: -3px; right: -3px; width: 6px; }
.npath .cell.wb::before { left: -3px; right: -3px; bottom: -3px; height: 6px; }
.npath .num {
  position: relative; z-index: 4; width: 58%; aspect-ratio: 1; border-radius: 50%;
  display: grid; place-items: center; background: var(--num-bg); color: var(--num-ink);
  font-weight: 800; font-size: calc(min(560px, 100vw) / var(--n) * .3); pointer-events: none;
}
.trail { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 3; pointer-events: none; }
.trail polyline { fill: none; stroke: var(--trail); stroke-width: .34; stroke-linecap: round; stroke-linejoin: round; opacity: .92; }
.npath .cell.flash { animation: flash .45s; }

.cell.flash { animation: flash .6s; }
@keyframes flash { 0%, 100% { filter: none; } 35% { filter: brightness(1.25) saturate(1.4); box-shadow: inset 0 0 0 4px var(--focus); } }

.board.solved { animation: pop .5s ease; }
@keyframes pop { 0% { transform: scale(1); } 40% { transform: scale(1.025); } 100% { transform: scale(1); } }

.controls { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 12px; }
.controls .btn { padding: 0 8px; }
body[data-mode="daily"] .controls { grid-template-columns: repeat(3, 1fr); }

.done-bar {
  display: flex; align-items: center; gap: 10px; justify-content: space-between; flex-wrap: wrap;
  margin-top: 12px; padding: 10px 12px 10px 14px; border-radius: 14px; background: color-mix(in srgb, var(--good) 13%, var(--card));
  border: 1px solid color-mix(in srgb, var(--good) 35%, var(--line)); font-weight: 600; font-size: 14.5px;
}
.done-bar .done-text { flex: 1 1 220px; }

.ad-slot { display: grid; justify-items: center; gap: 4px; margin: 18px auto; max-width: 100%; overflow: hidden; }
.ad-slot[hidden] { display: none; }
.ad-label { font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink3); }
.ad-slot iframe { max-width: 100%; }

.more { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.more a { display: flex; gap: 12px; align-items: center; padding: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; text-decoration: none; }
.more a:hover { border-color: var(--ink3); }
.more .em { font-size: 26px; }
.more strong { display: block; }
.more span { color: var(--ink2); font-size: 14px; }

/* ---------- dialogs ---------- */
dialog {
  border: 0; padding: 0; border-radius: 22px; background: var(--card); color: var(--ink);
  width: min(420px, calc(100vw - 24px)); box-shadow: 0 20px 60px rgba(0, 0, 0, .3);
  max-height: calc(100vh - 24px); overflow: auto;
}
dialog::backdrop { background: rgba(20, 15, 10, .5); backdrop-filter: blur(2px); }
.dlg { padding: 24px 22px 20px; text-align: center; position: relative; }
.dlg h2 { margin: 4px 0 4px; font-size: 24px; letter-spacing: -.02em; }
.dlg p { color: var(--ink2); margin: 6px 0; }
.dlg .x { position: absolute; top: 12px; right: 12px; }
.big-time { font-size: 46px; font-weight: 850; letter-spacing: -.03em; font-variant-numeric: tabular-nums; margin: 6px 0 0; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 16px 0; }
.stats div { background: var(--bg2); border-radius: 12px; padding: 10px 4px; }
.stats b { display: block; font-size: 22px; }
.stats span { font-size: 12.5px; color: var(--ink2); }
.dlg-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.dlg-tip { margin-top: 14px; font-size: 14px; color: var(--ink2); }
.dlg-tip a { color: var(--accent); font-weight: 650; }
.tip-amounts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 16px 0 8px; }
.tip-amt { font-size: 17px; }
.dlg .ad-slot { margin: 14px auto 0; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); margin-top: 50px; padding: 26px 0 40px; color: var(--ink3); font-size: 14px; }
footer .wrap { display: flex; gap: 14px 22px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
footer nav { display: flex; gap: 16px; flex-wrap: wrap; }
footer a { text-decoration: none; color: var(--ink2); }
footer a:hover { text-decoration: underline; }
.disclaimer { width: 100%; font-size: 12.5px; margin: 0; }

.toast {
  position: fixed; left: 50%; bottom: 22px; transform: translate(-50%, 30px); opacity: 0; z-index: 100;
  background: var(--ink); color: var(--bg); padding: 11px 18px; border-radius: 12px; font-weight: 600; font-size: 14.5px;
  transition: .25s; pointer-events: none; max-width: calc(100vw - 32px); text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.confetti { position: fixed; inset: 0; width: 100vw; height: 100vh; pointer-events: none; z-index: 200; }

.prose { max-width: 760px; margin: 30px auto; }
.prose h1 { letter-spacing: -.02em; }
.prose p, .prose li { color: var(--ink2); }

@media (max-width: 860px) {
  .cards { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .card .art { aspect-ratio: 2.2; }
}
@media (max-width: 640px) {
  .nav { display: none; }
  .top .wrap { height: 56px; }
  .more { grid-template-columns: 1fr; }
  .controls .btn span { display: none; }
  .controls .btn { min-height: 46px; }
  .hero { padding-top: 30px; }
  .rel { width: 19px; height: 19px; font-size: 14px; }
}
@media (max-width: 380px) {
  .board { border-width: 2px; }
}