/* ============ Ink & Paper — Sudoku ============ */

:root {
  --paper: #f4eee2;
  --paper-deep: #ece3d2;
  --ink: #22293a;
  --ink-soft: #5a6072;
  --ink-faint: #9aa0ae;
  --vermilion: #cf3f21;
  --vermilion-soft: #f3d8d0;
  --accent-wash: #dfe6dc;
  --line: #c9bfa9;
  --line-strong: #22293a;
  --cell-sel: #d8e0d4;
  --cell-peer: #ece5d4;
  --cell-same: #cdd8e8;
  --radius: 10px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Instrument Sans", -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { height: 100%; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  background-image:
    radial-gradient(ellipse at 20% -10%, rgba(207, 63, 33, 0.05), transparent 50%),
    radial-gradient(ellipse at 90% 110%, rgba(34, 41, 58, 0.06), transparent 55%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  display: flex;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 480px;
  padding: 14px 14px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---------- Header ---------- */

.header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 6px 2px 0;
}

.brand { display: flex; align-items: baseline; gap: 10px; }

.brand-jp {
  font-family: var(--font-display);
  font-size: 15px;
  color: #fff;
  background: var(--vermilion);
  padding: 4px 6px;
  border-radius: 4px;
  letter-spacing: 2px;
  box-shadow: 2px 2px 0 rgba(34, 41, 58, 0.18);
}

.brand-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 30px;
  letter-spacing: 0.5px;
}

.btn-text {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  color: var(--vermilion);
  background: none;
  border: none;
  border-bottom: 2px solid var(--vermilion);
  padding: 2px 0;
  cursor: pointer;
}

.header-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.06s;
}
.icon-btn:active { transform: scale(0.92); }
.icon-btn svg { width: 17px; height: 17px; }

/* ---------- Status bar ---------- */

.statusbar {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 8px 2px;
}

.status-item { display: flex; flex-direction: column; gap: 1px; }
.status-item:nth-child(2) { text-align: center; }
.status-timer { text-align: right; }

.status-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--ink-faint);
}

.status-value {
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.status-value.danger { color: var(--vermilion); }

.btn-pause {
  border: 1px solid var(--line);
  background: var(--paper-deep);
  border-radius: 6px;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ink);
}
.btn-pause svg { fill: currentColor; }

/* ---------- Board ---------- */

.board-wrap { position: relative; }

.board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  aspect-ratio: 1;
  background: #fbf7ee;
  border: 2.5px solid var(--line-strong);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 4px 5px 0 rgba(34, 41, 58, 0.12);
}

.board:focus { outline: none; }
.board:focus-visible { outline: 3px solid var(--vermilion); outline-offset: 3px; }

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: clamp(18px, 5.4vw, 27px);
  font-weight: 600;
  color: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  transition: background 0.08s;
}

.cell:nth-child(9n) { border-right: none; }
.cell:nth-child(n+73) { border-bottom: none; }
.cell.br3 { border-right: 2px solid var(--line-strong); }
.cell.bb3 { border-bottom: 2px solid var(--line-strong); }

.cell.given { color: var(--ink); }
.cell.user { color: #2c5f8a; }
.cell.peer { background: var(--cell-peer); }
.cell.same { background: var(--cell-same); }
.cell.selected { background: var(--cell-sel); box-shadow: inset 0 0 0 2px var(--ink); }
.cell.error { color: var(--vermilion); }
.cell.error.same, .cell.error.peer { background: var(--vermilion-soft); }

.cell.pop { animation: pop 0.18s ease-out; }
@keyframes pop {
  0% { transform: scale(0.6); }
  70% { transform: scale(1.12); }
  100% { transform: scale(1); }
}

.cell .notes {
  position: absolute;
  inset: 1px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
}

.cell .notes span {
  font-family: var(--font-body);
  font-size: clamp(7px, 2vw, 10px);
  font-weight: 500;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Pause overlay ---------- */

.pause-overlay {
  position: absolute;
  inset: 0;
  background: rgba(244, 238, 226, 0.92);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  z-index: 5;
}

.pause-card { text-align: center; display: flex; flex-direction: column; gap: 10px; align-items: center; }

.pause-jp {
  font-family: var(--font-display);
  font-size: 34px;
  color: var(--vermilion);
}

.pause-card p {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
}

/* ---------- Toolbar ---------- */

.toolbar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.tool {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 9px 4px 7px;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.06s, background 0.1s;
}

.tool:active { transform: scale(0.94); }
.tool svg { width: 20px; height: 20px; }
.tool.active { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.tool:disabled { opacity: 0.4; cursor: default; }

.tool-badge {
  position: absolute;
  top: -6px;
  right: -4px;
  font-style: normal;
  font-size: 9px;
  font-weight: 600;
  background: var(--vermilion);
  color: #fff;
  border-radius: 8px;
  padding: 2px 6px;
}

/* ---------- Numpad ---------- */

.numpad {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
}

.num {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0 5px;
  background: #fbf7ee;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: clamp(20px, 6vw, 26px);
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.06s, background 0.1s;
  box-shadow: 2px 2px 0 rgba(34, 41, 58, 0.08);
}

.num:active { transform: scale(0.92); }
.num .count {
  font-family: var(--font-body);
  font-size: 10px;
  color: var(--ink-faint);
  font-weight: 500;
}
.num.depleted { opacity: 0.25; pointer-events: none; }

/* ---------- Modal ---------- */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(34, 41, 58, 0.45);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 20px;
  overflow-y: auto;      /* short/landscape viewports must not clip the card */
}

.modal-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 14px;
  box-shadow: 6px 7px 0 rgba(34, 41, 58, 0.3);
  padding: 26px 24px 22px;
  width: 100%;
  max-width: 340px;
  margin: auto;          /* centers while still allowing the flex parent to scroll */
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
  animation: modal-in 0.22s ease-out;
}

.cal-card, .stats-card { max-width: 380px; }

@keyframes modal-in {
  from { transform: translateY(14px) scale(0.96); opacity: 0; }
  to { transform: none; opacity: 1; }
}

.modal-jp {
  font-family: var(--font-display);
  font-size: 15px;
  color: var(--vermilion);
  letter-spacing: 4px;
}

.modal-card h2 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
}

.modal-text { font-size: 14px; color: var(--ink-soft); line-height: 1.45; }

.modal-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 6px; }

.btn-primary, .btn-secondary {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.06s;
}
.btn-primary:active, .btn-secondary:active { transform: scale(0.97); }

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 rgba(207, 63, 33, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--line);
}

.btn-diff { position: relative; text-align: left; display: flex; justify-content: space-between; align-items: center; }
.btn-diff small { font-weight: 500; color: var(--ink-faint); font-size: 12px; }

.hidden { display: none !important; }

/* Confetti-ish win flourish */
.win-stat {
  display: flex;
  justify-content: space-around;
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
  padding: 10px 0;
  margin: 4px 0;
}
.win-stat div { display: flex; flex-direction: column; gap: 2px; }
.win-stat .status-label { font-size: 9px; }
.win-stat b { font-family: var(--font-display); font-size: 20px; }

/* ---------- Daily challenge calendar ---------- */

.cal-streak { font-size: 13px; color: var(--ink-soft); }
.cal-streak b { color: var(--vermilion); font-family: var(--font-display); font-size: 16px; }

.cal-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.cal-month-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  text-transform: capitalize;
}

.cal-nav-btn {
  width: 30px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-deep);
  color: var(--ink);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}
.cal-nav-btn:disabled { opacity: 0.3; cursor: default; }

.cal-week {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--ink-faint);
  margin-top: 2px;
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-top: 4px;
}

.cal-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbf7ee;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.06s;
}
.cal-day:active { transform: scale(0.9); }
.cal-day.empty { visibility: hidden; }
.cal-day:disabled { opacity: 0.25; cursor: default; }
.cal-day.today { box-shadow: inset 0 0 0 2px var(--vermilion); }
.cal-day.done { background: var(--vermilion); border-color: var(--vermilion); color: #fff; }
.cal-day.current { outline: 2px dashed var(--ink); outline-offset: 1px; }

/* ---------- Stats ---------- */

.stats-body { display: flex; flex-direction: column; gap: 8px; margin-top: 2px; }

.stats-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.stats-table th {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--ink-faint);
  font-weight: 500;
  text-align: right;
  padding: 4px 2px;
}
.stats-table th:first-child { text-align: left; }
.stats-table td {
  padding: 6px 2px;
  border-top: 1px dashed var(--line);
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}
.stats-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
}
.stats-table td b { color: var(--ink); }

.stats-daily {
  display: flex;
  justify-content: space-around;
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
  padding: 10px 0;
}
.stats-daily div { display: flex; flex-direction: column; gap: 2px; text-align: center; }
.stats-daily .status-label { font-size: 9px; }
.stats-daily b { font-family: var(--font-display); font-size: 20px; }