/* Sudoku Sova on the web: the app's own night and day, its type and its board. */
@font-face {
  font-family: "Fraunces";
  src: url("fonts/Fraunces-VF.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: "Alegreya Sans";
  src: url("fonts/AlegreyaSans-Regular.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Alegreya Sans";
  src: url("fonts/AlegreyaSans-Bold.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --bg: #0e1426;
  --surface: #161e36;
  --surface-2: #1e2842;
  --board: #131b31;
  --grid-thin: #2c3a5c;
  --grid-thick: #63719a;
  --given: #e9ecf6;
  --user: #7fb2e0;
  --accent: #eba946;
  --accent-soft: #3a2f14;
  --on-accent: #0e1426;
  --selection: #2e3c63;
  --peer: #222e4e;
  --same: #2a3a5e;
  --error: #e27c63;
  --error-cell: #3a1e1a;
  --hint-region: #352c15;
  --hint-target: #5a431a;
  --text: #e9ecf6;
  --text-2: #b4bbd2;
  --muted: #7c86a6;
  --radius: 18px;
  --display: "Fraunces", Georgia, "Times New Roman", serif;
  --body: "Alegreya Sans", system-ui, -apple-system, "Segoe UI", "Noto Sans",
    "Hiragino Sans", "PingFang SC", "Microsoft YaHei", "Apple SD Gothic Neo",
    "Noto Sans Thai", "Geeza Pro", "Noto Naskh Arabic", sans-serif;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #efeae0;
    --surface: #f7f3eb;
    --surface-2: #fdfbf6;
    --board: #fbf8f2;
    --grid-thin: #d3cbba;
    --grid-thick: #5e5646;
    --given: #25304b;
    --user: #2f6b9e;
    --accent: #8f5709;
    --accent-soft: #f3e3c6;
    --on-accent: #fdfbf6;
    --selection: #ede1c6;
    --peer: #ede8dc;
    --same: #e7dfcb;
    --error: #b8442b;
    --error-cell: #f3ded7;
    --hint-region: #f3ead3;
    --hint-target: #f0d492;
    --text: #25304b;
    --text-2: #5a6178;
    --muted: #6b6657;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 18px/1.55 var(--body);
  /* Alegreya's old-style figures make "0" read as "o" in a mistake count. */
  font-variant-numeric: lining-nums;
  overflow-x: hidden;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

/* Header */
.site-head {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 0; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.brand span { font: 600 22px/1 var(--display); }
.brand b { color: var(--accent); font-weight: 600; }
.head-links { margin-left: auto; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.head-links a { color: var(--text-2); text-decoration: none; font-size: 16px; }
.head-links a:hover, .head-links a[aria-current="page"] { color: var(--accent); }
.head-links a.btn-accent, .head-links a.btn-accent:hover { color: var(--on-accent); }
.lang-select {
  background: var(--surface); color: var(--text); border: 1px solid var(--grid-thin);
  border-radius: 10px; padding: 6px 8px; font: inherit; font-size: 15px;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 18px; border-radius: 12px; border: 0;
  font: 700 16px/1.2 var(--body); text-decoration: none; cursor: pointer;
}
.btn-accent { background: var(--accent); color: var(--on-accent); }
.btn-quiet { background: var(--surface); color: var(--text); }
.btn-quiet[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); }

h1, h2, h3 { font-family: var(--display); font-weight: 600; line-height: 1.15; }
h1 { font-size: clamp(30px, 6vw, 46px); margin: 18px 0 10px; }
h2 { font-size: clamp(24px, 4vw, 30px); margin: 34px 0 10px; }
h3 { font-size: 20px; margin: 22px 0 6px; }
.lead { font-size: 20px; color: var(--text-2); margin: 0 0 18px; }
.eyebrow { color: var(--accent); font-size: 13px; letter-spacing: .12em; text-transform: uppercase; font-weight: 700; }

.card { background: var(--surface); border-radius: var(--radius); padding: 20px; }
.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.tech-card { display: block; text-decoration: none; color: var(--text); background: var(--surface); border-radius: 14px; padding: 14px 16px; }
.tech-card:hover { background: var(--surface-2); }
.tech-card strong { font: 600 19px/1.2 var(--display); display: block; margin-bottom: 4px; }
.tech-card span { color: var(--text-2); font-size: 16px; }
.level-dots { color: var(--accent); letter-spacing: 2px; font-size: 12px; }

/* The technique example board (inline SVG). */
.example { display: grid; grid-template-columns: minmax(0, 420px) 1fr; gap: 24px; align-items: start; margin: 18px 0; }
.example svg { width: 100%; height: auto; display: block; }
.legend { list-style: none; padding: 0; margin: 0; color: var(--text-2); font-size: 16px; }
.legend li { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; }
.swatch { width: 18px; height: 18px; border-radius: 5px; flex: none; }
.sw-region { background: var(--hint-region); border: 1px solid var(--grid-thin); }
.sw-pattern { background: var(--hint-target); }
.sw-removed { background: var(--error-cell); border: 1px solid var(--error); }
svg .ex-bg { fill: var(--board); }
svg .ex-region { fill: var(--hint-region); }
svg .ex-pattern { fill: var(--hint-target); }
svg .ex-removed-cell { fill: var(--error-cell); }
svg .ex-thin { stroke: var(--grid-thin); stroke-width: 1; }
svg .ex-thick { stroke: var(--grid-thick); stroke-width: 2.5; fill: none; }
svg .ex-given { fill: var(--given); font: 500 30px var(--display); }
svg .ex-placed { fill: var(--accent); font: 700 30px var(--display); }
svg .ex-cand { fill: var(--muted); font: 400 11.5px var(--body); }
svg .ex-cand-key { fill: var(--accent); font-weight: 700; }
svg .ex-cand-gone { fill: var(--error); }
svg .ex-strike { stroke: var(--error); stroke-width: 1.4; }

.steps { padding-left: 22px; }
.steps li { margin-bottom: 8px; }
.cta { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; background: var(--accent-soft); border-radius: var(--radius); padding: 18px 20px; margin: 30px 0; }
.cta p { margin: 0; flex: 1 1 260px; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin: 26px 0; flex-wrap: wrap; }
.pager a { text-decoration: none; }

/* The daily player */
.daily { display: grid; grid-template-columns: minmax(0, 520px) minmax(0, 1fr); gap: 28px; align-items: start; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tabs button { flex: 1 1 auto; }
.status { display: flex; justify-content: space-between; color: var(--text-2); font-size: 15px; margin: 6px 2px 10px; }
.status .time { font: 500 18px var(--display); color: var(--text); font-variant-numeric: tabular-nums; }
.date-nav { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.date-nav button { min-width: 44px; }
.date-nav strong { font: 600 18px var(--display); text-align: center; }

.board {
  display: grid; grid-template-columns: repeat(9, minmax(0, 1fr));
  aspect-ratio: 1; width: 100%;
  background: var(--board); border: 2.5px solid var(--grid-thick); border-radius: 14px; overflow: hidden;
  touch-action: manipulation; user-select: none; -webkit-user-select: none;
}
.cell {
  position: relative; border: 0; padding: 0; margin: 0; background: transparent; color: var(--given);
  border-right: 1px solid var(--grid-thin); border-bottom: 1px solid var(--grid-thin);
  font: 500 clamp(18px, 5.4vw, 30px)/1 var(--display); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.cell:nth-child(9n) { border-right: 0; }
.cell:nth-child(9n+3), .cell:nth-child(9n+6) { border-right: 2.5px solid var(--grid-thick); }
.cell.r3, .cell.r6 { border-bottom: 2.5px solid var(--grid-thick); }
.cell.r9 { border-bottom: 0; }
.cell.user { color: var(--user); font-weight: 450; }
.cell.peer { background: var(--peer); }
.cell.same { background: var(--same); }
.cell.sel { background: var(--selection); box-shadow: inset 0 0 0 2px var(--accent); }
.cell.wrong { color: var(--error); background: var(--error-cell); }
.cell.wrong::after { content: ""; position: absolute; left: 28%; right: 28%; top: 50%; height: 2px; background: var(--error); border-radius: 2px; }
.cell .notes { position: absolute; inset: 2px; display: grid; grid-template-columns: repeat(3, 1fr); font: 400 clamp(8px, 2vw, 12px)/1 var(--body); color: var(--muted); }
.cell .notes span { display: flex; align-items: center; justify-content: center; }

.pad { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 4px; margin-top: 12px; }
.pad button { min-height: 56px; border: 0; border-radius: 10px; background: transparent; color: var(--text); font: 500 26px/1 var(--display); cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; }
.pad button small { font: 400 11px var(--body); color: var(--muted); }
.pad button:disabled { opacity: .3; cursor: default; }
.pad.notes button { font-size: 19px; color: var(--text-2); }
.tools { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 10px; }

.done { text-align: center; }
.done h2 { color: var(--accent); margin-top: 6px; }
.done .stats { display: flex; justify-content: center; gap: 28px; margin: 10px 0 16px; }
.done .stats b { display: block; font: 600 28px var(--display); }
.done .stats span { color: var(--muted); font-size: 14px; }
.done .row { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
[hidden] { display: none !important; }

.site-foot { color: var(--muted); font-size: 15px; padding: 30px 0 40px; border-top: 1px solid var(--grid-thin); margin-top: 40px; }
.site-foot a { color: var(--text-2); }
.site-foot nav { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }
.langs { display: flex; flex-wrap: wrap; gap: 6px 14px; margin: 8px 0; }

[dir="rtl"] .head-links { margin-left: 0; margin-right: auto; }
[dir="rtl"] .steps { padding-left: 0; padding-right: 22px; }

@media (max-width: 760px) {
  .daily, .example { grid-template-columns: minmax(0, 1fr); }
  .head-links { margin-left: 0; width: 100%; gap: 12px; }
  .head-links .btn-accent { display: none; }
  .lang-select { margin-left: auto; max-width: 46vw; }
  [dir="rtl"] .lang-select { margin-left: 0; margin-right: auto; }
  .pad button { min-height: 50px; font-size: 24px; }
  body { font-size: 17px; }
}