/* ============================================================
   Helpful Sudoku — App UI styles
   ============================================================ */

/* ---- Layout shell ---- */
.hs-app { min-height: 100vh; display: flex; flex-direction: column; }
.hs-main { flex: 1; display: flex; justify-content: center; padding: 40px 32px 64px; overflow-x: auto; }

/* ---- Top bar ---- */
.hs-topbar {
  height: 60px;
  border-bottom: 1px solid var(--hairline);
  display: flex; align-items: center;
  padding: 0 20px;
  gap: 24px;
  background: var(--bg);
  position: sticky; top: 0; z-index: 10;
}
.hs-brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none;
  color: var(--fg);
  flex-shrink: 0;
}
.hs-brand-name {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
}
.hs-nav { display: flex; gap: 2px; margin-left: 24px; }
.hs-nav-item {
  background: transparent; border: 0;
  padding: 8px 12px;
  border-radius: var(--r-2);
  color: var(--fg-2);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: background var(--dur-1), color var(--dur-1);
}
.hs-nav-item:hover { background: var(--surface-2); color: var(--fg); }
.hs-nav-item.on { color: var(--fg); background: var(--surface-2); font-weight: 600; }
.hs-nav-item i { font-size: 16px; }

.hs-top-meta {
  margin-left: auto; display: flex; align-items: center; gap: 10px;
  color: var(--fg-2); font-size: 13px;
}
.hs-streak {
  display: inline-flex; align-items: center; gap: 4px;
  color: var(--ochre-700); font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.hs-streak i { color: var(--ochre-500); font-size: 16px; }

.hs-theme-toggle {
  background: transparent; border: 1px solid var(--hairline);
  border-radius: var(--r-2);
  padding: 6px 8px;
  color: var(--fg-2);
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 4px;
}
.hs-theme-toggle:hover { background: var(--surface-2); color: var(--fg); }
.hs-theme-toggle i { font-size: 16px; }
.hs-accent-swatches {
  display: inline-flex; gap: 4px;
  padding: 3px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-pill);
}
.hs-accent-sw {
  width: 20px; height: 20px; border-radius: 50%;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-1);
}
.hs-accent-sw.on { border-color: var(--fg); transform: scale(1.05); }
.hs-accent-sw:hover { transform: scale(1.1); }
.hs-accent-sw.sage  { background: var(--sage-500); }
.hs-accent-sw.blue  { background: var(--blue-500); }
.hs-accent-sw.ochre { background: var(--ochre-500); }

/* ---- Common buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13px;
  padding: 10px 18px;
  border-radius: var(--r-2);
  border: 1px solid var(--fg);
  background: var(--fg);
  color: var(--bg);
  cursor: pointer;
  transition: background var(--dur-1), color var(--dur-1);
  letter-spacing: -0.005em;
}
.btn.primary:hover { opacity: 0.9; }
.btn.secondary { background: var(--surface); color: var(--fg); border-color: var(--hairline-strong); }
.btn.secondary:hover { background: var(--surface-2); }
.btn.accent { background: var(--accent); border-color: var(--accent); color: white; }
[data-theme="dark"] .btn.accent { color: var(--mid-0); }
.btn.accent:hover { background: var(--accent-600); border-color: var(--accent-600); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--fg-2); }
.btn.ghost:hover { background: var(--surface-2); color: var(--fg); }

/* ---- Board ---- */
.hs-board {
  --cell: 58px;
  display: grid;
  grid-template-columns: repeat(9, var(--cell));
  grid-template-rows: repeat(9, var(--cell));
  border: 2px solid var(--fg);
  background: var(--fg);
  gap: 1px;
  padding: 1px;
  border-radius: 6px;
  user-select: none;
  overflow: hidden;
}
.hs-cell {
  background: var(--cell-bg);
  border: 0; padding: 0; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  transition: background var(--dur-1);
}
.hs-cell.box-r { box-shadow: 0 1px 0 var(--fg); }
.hs-cell.box-b { box-shadow: 1px 0 0 var(--fg); }
.hs-cell.box-r.box-b { box-shadow: 0 1px 0 var(--fg), 1px 0 0 var(--fg); }
.hs-cell .digit {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 26px;
  font-variant-numeric: tabular-nums;
  color: var(--digit-user);
  line-height: 1;
}
.hs-cell.is-given .digit { color: var(--digit-given); font-weight: 600; }
.hs-cell.is-err .digit { color: var(--digit-error); }
.hs-cell.is-solv .digit { color: var(--digit-solved); }
.hs-cell.is-sel  { background: var(--cell-bg-selected); }
.hs-cell.is-peer { background: var(--cell-bg-peer); }
.hs-cell.is-same { background: var(--cell-bg-same); }
.hs-cell.is-hint { background: var(--cell-bg-hint); }
.hs-cell.is-err  { background: var(--cell-bg-error); }
.hs-cell.is-solv { background: var(--cell-bg-solved); }
.hs-cell:hover:not(.is-sel):not(.is-err) { background: var(--cell-bg-peer); }
.hs-cell .notes {
  width: 100%; height: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  padding: 2px;
}
.hs-cell .notes .n {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--digit-note);
  display: flex; align-items: center; justify-content: center;
  font-variant-numeric: tabular-nums;
}
.hs-cell .notes .n.on { color: var(--accent-700); font-weight: 600; }
[data-theme="dark"] .hs-cell .notes .n.on { color: var(--accent-300); }

/* Board size variants */
[data-board-size="S"] .hs-board { --cell: 40px; }
[data-board-size="M"] .hs-board { --cell: 49px; }
[data-board-size="L"] .hs-board { --cell: 58px; }
[data-board-size="XL"] .hs-board { --cell: 68px; }
[data-board-size="S"] .hs-play-left { width: auto; }
[data-board-size="M"] .hs-play-left { width: auto; }

/* ---- Toolbar ---- */
.hs-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  border: 1px solid var(--hairline);
  border-radius: var(--r-3);
  background: var(--surface);
  padding: 6px 8px;
  margin-bottom: 14px;
  gap: 8px;
}
.hs-toolbar .grp { display: flex; gap: 2px; align-items: center; }
.hs-toolbar .div {
  width: 1px; height: 16px;
  background: var(--hairline-strong);
  margin: 0 4px;
}
.hs-toolbar .timer {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  font-size: 14px;
  color: var(--fg-2);
  letter-spacing: 0.03em;
  flex: 1;
  text-align: center;
}
.hs-toolbar button.i {
  background: transparent; border: 0; padding: 7px 8px;
  border-radius: var(--r-2);
  color: var(--fg-2); cursor: pointer;
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 12px;
  white-space: nowrap;
}
.hs-toolbar button.i:hover { background: var(--surface-2); color: var(--fg); }
.hs-toolbar button.i.on {
  background: color-mix(in oklch, var(--accent) 18%, var(--surface));
  color: var(--accent-700);
}
[data-theme="dark"] .hs-toolbar button.i.on { color: var(--accent-300); }
.hs-toolbar button.i i { font-size: 16px; }

/* ---- Number pad ---- */
.hs-pad {
  margin-top: 14px;
  display: flex; gap: 14px; align-items: stretch;
}
.hs-pad-keys {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 6px;
}
.hs-key {
  aspect-ratio: 1;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-2);
  background: var(--surface);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  color: var(--fg);
  transition: background var(--dur-1), border-color var(--dur-1);
  flex-direction: column;
}
.hs-key .d {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 22px;
  font-variant-numeric: tabular-nums;
}
.hs-key .c {
  position: absolute; top: 4px; right: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-3);
}
.hs-key:hover { background: var(--surface-2); }
.hs-key.on {
  background: color-mix(in oklch, var(--accent) 22%, var(--surface));
  border-color: var(--accent);
  color: var(--accent-700);
}
[data-theme="dark"] .hs-key.on { color: var(--accent-300); }
.hs-key.done { color: var(--fg-4); background: var(--surface-2); text-decoration: line-through; border-style: dashed; }
.hs-key.done .c { color: var(--fg-4); }

.hs-pad-side {
  display: flex; flex-direction: column; gap: 6px;
  min-width: 100px;
}
.hs-pad-btn {
  border: 1px solid var(--hairline-strong);
  background: var(--surface);
  border-radius: var(--r-2);
  padding: 10px 12px;
  cursor: pointer;
  color: var(--fg);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 12px;
  display: inline-flex; align-items: center; gap: 6px;
  flex: 1;
}
.hs-pad-btn i { font-size: 16px; }
.hs-pad-btn.on {
  background: color-mix(in oklch, var(--accent) 22%, var(--surface));
  border-color: var(--accent);
  color: var(--accent-700);
}
[data-theme="dark"] .hs-pad-btn.on { color: var(--accent-300); }
.hs-pad-btn:hover { background: var(--surface-2); }

/* ---- Play layout ---- */
.hs-play {
  display: grid;
  grid-template-columns: minmax(0, auto) 300px;
  gap: 32px;
  align-items: flex-start;
}
.hs-play-left { width: 542px; max-width: 100%; }
.hs-play-right { display: flex; flex-direction: column; gap: 16px; }
.hs-panel {
  border: 1px solid var(--hairline);
  border-radius: var(--r-3);
  background: var(--surface);
  padding: 16px;
}
.hs-panel h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 15px;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.hs-panel .eye {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 6px;
}
.hs-panel .kv {
  display: flex; justify-content: space-between;
  font-size: 13px; color: var(--fg-2);
  padding: 5px 0;
  border-bottom: 1px dashed var(--hairline);
}
.hs-panel .kv:last-child { border-bottom: 0; }
.hs-panel .kv .v { color: var(--fg); font-variant-numeric: tabular-nums; font-family: var(--font-mono); font-size: 12px; }

.hint-card {
  background: color-mix(in oklch, var(--accent) 10%, var(--surface));
  border-color: color-mix(in oklch, var(--accent) 30%, var(--hairline));
}
.hint-card .eye { color: var(--accent-700); }
[data-theme="dark"] .hint-card .eye { color: var(--accent-300); }
.hint-card p { margin: 0; font-size: 13px; color: var(--fg); line-height: 1.55; }
.hint-card kbd {
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--surface);
  color: var(--fg);
}

.solver-card .row { display: flex; align-items: center; justify-content: space-between; margin-top: 8px; }
.solver-card .speed { display: flex; gap: 4px; }
.solver-card .speed .s {
  border: 1px solid var(--hairline);
  padding: 3px 8px;
  font-size: 11px;
  border-radius: var(--r-2);
  color: var(--fg-2);
  cursor: pointer;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.solver-card .speed .s.on {
  background: color-mix(in oklch, var(--solver) 22%, var(--surface));
  border-color: var(--solver);
  color: var(--solver-700);
}
[data-theme="dark"] .solver-card .speed .s.on { color: var(--solver-300); }

/* ---- Daily view ---- */
.hs-daily { max-width: 720px; padding: 20px 0; width: 100%; }
.hs-daily-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: -0.03em;
  margin: 6px 0 8px;
  color: var(--fg);
  max-width: 16ch;
}
.hs-daily-sub { color: var(--fg-2); font-size: 14px; margin: 0 0 32px; }
.hs-daily-preview { display: flex; justify-content: flex-start; margin-bottom: 32px; }
.mini-board {
  --c: 32px;
  display: grid;
  grid-template-columns: repeat(9, var(--c));
  grid-template-rows: repeat(9, var(--c));
  border: 2px solid var(--fg);
  background: var(--fg);
  gap: 1px;
  padding: 1px;
  border-radius: 4px;
}
.mini-board .mc {
  background: var(--surface);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}
.mini-board .mc.box-r { box-shadow: 0 1px 0 var(--fg); }
.mini-board .mc.box-b { box-shadow: 1px 0 0 var(--fg); }
.hs-daily-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.hs-daily-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
}
.strip-item .k {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 6px;
}
.strip-item .v {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 22px;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

/* ---- Settings ---- */
.hs-settings { max-width: 720px; padding: 20px 0; width: 100%; }
.hs-settings-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 42px;
  letter-spacing: -0.03em;
  margin: 6px 0 8px;
  color: var(--fg);
}
.hs-settings-sub { color: var(--fg-2); font-size: 14px; margin: 0 0 32px; max-width: 60ch; }
.s-group { margin-bottom: 32px; }
.s-group-h {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 10px;
}
.s-list {
  border: 1px solid var(--hairline);
  border-radius: var(--r-3);
  background: var(--surface);
  overflow: hidden;
}
.s-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline);
  gap: 24px;
}
.s-row:last-child { border-bottom: 0; }
.s-lbl { font-family: var(--font-sans); font-weight: 600; font-size: 14px; color: var(--fg); }
.s-sub { font-size: 12px; color: var(--fg-3); margin-top: 3px; max-width: 50ch; }
.tog {
  width: 40px; height: 24px;
  background: var(--surface-3);
  border: 1px solid var(--hairline-strong);
  border-radius: 12px;
  position: relative; cursor: pointer;
  transition: background var(--dur-2), border-color var(--dur-2);
  flex-shrink: 0;
}
.tog::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 18px; height: 18px;
  background: var(--surface);
  border-radius: 50%; box-shadow: var(--shadow-1);
  transition: left var(--dur-2);
}
.tog.on { background: var(--accent); border-color: var(--accent); }
.tog.on::after { left: 18px; background: white; }
[data-theme="dark"] .tog::after { background: var(--fg); }
[data-theme="dark"] .tog.on::after { background: var(--mid-0); }
.seg {
  display: inline-flex;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-2);
  overflow: hidden;
  background: var(--surface);
}
.seg-i {
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 12px;
  color: var(--fg-2);
  border-right: 1px solid var(--hairline);
  cursor: pointer;
}
.seg-i:last-child { border-right: 0; }
.seg-i.on { background: var(--fg); color: var(--bg); font-weight: 600; }

.theme-choices { display: flex; gap: 6px; }
.theme-tile {
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-2);
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 12px;
  color: var(--fg-2);
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--surface);
}
.theme-tile i { font-size: 14px; }
.theme-tile.on { background: var(--fg); color: var(--bg); border-color: var(--fg); font-weight: 600; }

.accent-choices { display: flex; gap: 8px; }
.accent-tile {
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-2);
  padding: 6px 10px 6px 6px;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--surface);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 12px;
  color: var(--fg-2);
}
.accent-tile .swatch {
  width: 20px; height: 20px; border-radius: 50%;
}
.accent-tile.on { background: var(--fg); color: var(--bg); border-color: var(--fg); font-weight: 600; }
.accent-tile.sage  .swatch { background: var(--sage-500); }
.accent-tile.blue  .swatch { background: var(--blue-500); }
.accent-tile.ochre .swatch { background: var(--ochre-500); }

/* ---- Import ---- */
.hs-import { max-width: 720px; padding: 20px 0; width: 100%; }
.hs-import-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 42px;
  letter-spacing: -0.03em;
  margin: 6px 0 24px;
  color: var(--fg);
}
.tabs {
  display: flex; gap: 4px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 20px;
}
.tab {
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 13px;
  color: var(--fg-3);
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  background: none;
  border-top: none; border-left: none; border-right: none;
}
.tab.on { color: var(--fg); border-bottom-color: var(--fg); font-weight: 600; }
.tab i { font-size: 16px; }
.import-body { display: flex; flex-direction: column; gap: 12px; }
.ta {
  width: 100%; min-height: 260px;
  padding: 14px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-3);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--fg);
  line-height: 1.7;
  font-variant-numeric: tabular-nums;
  resize: vertical;
}
.ta:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.import-meta {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--fg-3); font-size: 12px;
}
.dropzone {
  border: 1px dashed var(--hairline-strong);
  border-radius: var(--r-3);
  padding: 48px 24px;
  text-align: center;
  color: var(--fg-3);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  background: var(--surface-2);
}
.dz-title { font-family: var(--font-sans); font-weight: 600; font-size: 15px; color: var(--fg); margin-top: 8px; }
.dz-sub { font-size: 12px; color: var(--fg-3); max-width: 40ch; }
.dropzone .btn { margin-top: 12px; }

/* ---- Toast ---- */
.hs-toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-3);
  box-shadow: var(--shadow-2);
  padding: 14px 18px;
  display: flex; align-items: center; gap: 12px;
  min-width: 260px;
  z-index: 100;
  animation: toast-in var(--dur-3) var(--ease-out) both;
}
.hs-toast.hiding { animation: toast-out var(--dur-2) var(--ease-standard) both; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes toast-out {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(8px); }
}
.hs-toast-pill {
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.hs-toast-pill.good  { background: color-mix(in oklch, var(--sage-500)  18%, var(--surface)); color: var(--sage-700); }
.hs-toast-pill.multi { background: color-mix(in oklch, var(--ochre-500) 18%, var(--surface)); color: var(--ochre-700); }
.hs-toast-pill.none  { background: color-mix(in oklch, var(--clay-500)  18%, var(--surface)); color: var(--clay-700); }
.hs-toast-msg { font-size: 13px; color: var(--fg); flex: 1; }
.hs-toast-close { background: none; border: none; cursor: pointer; color: var(--fg-3); padding: 0 2px; font-size: 18px; line-height: 1; }

/* ---- Responsive ---- */
@media (max-width: 920px) {
  .hs-play {
    grid-template-columns: 1fr;
  }
  .hs-play-left { width: 100%; }
  .hs-daily-strip { grid-template-columns: repeat(2, 1fr); }
  .hs-nav { display: none; }
}
@media (max-width: 600px) {
  .hs-main { padding: 20px 16px 48px; }
  .hs-board { --cell: 38px; }
  .hs-daily-title { font-size: 36px; }
  .hs-daily-strip { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .hs-brand-name { display: none; }
}