/*
 * strts – Gestaltung
 * Copyright (C) 2026 5C – GPL-3.0, siehe LICENSE
 * Bewusst nur Schwarz, Weiß und Grautöne; einzige Ausnahme ist die Fehlerfarbe.
 */

:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #7a7a7a;
  --line: #c9c9c9;
  --cell: #ffffff;
  --black: #1a1a1a;
  --black-fg: #ffffff;
  --given: #111111;
  --peer: #f3f3f3;
  --same: #e3e3e3;
  --sel: #dedede;
  --btn: #f4f4f4;
  --btn-hover: #e8e8e8;
  --btn-border: #d4d4d4;
  --error: #c62828;
  --shadow: 0 12px 40px rgba(0, 0, 0, .18);
  --lg-a: #1a1a1a;
  --lg-b: #616161;
  --lg-c: #a8a8a8;

  --gutter: 10px;     /* Seitenrand im Hochformat */
  --panel-h: 186px;   /* Aktionszeile + Ziffernblock + Umschalter im Hochformat */
  --top-h: 46px;
  --extra-top: 0px;   /* zusätzlicher Abstand oben, siehe Web-App-Regel unten */
  --size: max(280px, min(100vw - 2 * var(--gutter), 100dvh - var(--top-h) - var(--panel-h) - var(--extra-top) - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom), 680px));
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #ededed;
    --muted: #8f8f8f;
    --line: #3d3d3d;
    --cell: #202020;
    --black: #000000;
    --black-fg: #ededed;
    --given: #f5f5f5;
    --peer: #2a2a2a;
    --same: #353535;
    --sel: #4a4a4a;
    --btn: #1f1f1f;
    --btn-hover: #2b2b2b;
    --btn-border: #3a3a3a;
    --error: #ef6b6b;
    --shadow: 0 12px 40px rgba(0, 0, 0, .6);
    --lg-a: #f2f2f2;
    --lg-b: #ababab;
    --lg-c: #6e6e6e;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

a { color: inherit; text-underline-offset: 2px; }

button {
  font: inherit;
  color: inherit;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

/* ---------- Grundaufbau ---------- */

.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: calc(env(safe-area-inset-top) + var(--extra-top)) env(safe-area-inset-right) max(0px, env(safe-area-inset-bottom) - 14px) env(safe-area-inset-left);
}

.top {
  height: var(--top-h);
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  max-width: calc(var(--size) + 2 * var(--gutter));
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo { height: 30px; width: auto; flex: none; }
.lg-fill { fill: var(--bg); }
.lg-a { stroke: var(--lg-a); }
.lg-b { stroke: var(--lg-b); }
.lg-c { stroke: var(--lg-c); }

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-size: 19px; font-weight: 700; letter-spacing: .02em; }
.brand-sub { font-size: 11px; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }

.status { display: flex; align-items: center; gap: 14px; font-size: 14px; }
.level { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); white-space: nowrap; }
.timer { font-variant-numeric: tabular-nums; font-weight: 600; min-width: 3.2em; text-align: right; }

.dots { display: inline-flex; gap: 3px; }
.dots i { width: 6px; height: 6px; border-radius: 50%; background: var(--line); }
.dots i.on { background: var(--fg); }

.game {
  flex: 1;
  display: grid;
  grid-template-columns: var(--size);
  justify-content: center;
  align-content: center;
  gap: 8px;
  padding: 0 var(--gutter) 6px;
}

/* Als Web-App vom Home-Bildschirm legt iOS unter die Statusleiste einen Weichzeichner,
   der über den sicheren Bereich hinausreicht. Die Kopfzeile rückt deshalb etwas tiefer. */
@media (display-mode: standalone) and (orientation: portrait) {
  :root { --extra-top: 36px; }
}

/* ---------- Spielfeld ---------- */

.board-wrap { position: relative; width: var(--size); height: var(--size); flex: none; }

.board {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template: repeat(9, 1fr) / repeat(9, 1fr);
  gap: 1px;
  padding: 1px;
  background: var(--line);
  outline: 1px solid var(--line);
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.cell {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  background: var(--cell);
  color: var(--given);
  font-size: calc(var(--size) / 9 * .56);
  font-weight: 400;
  line-height: 1;
  cursor: pointer;
}

.cell.given { font-weight: 800; }
.cell.black { background: var(--black); color: var(--black-fg); font-weight: 800; cursor: default; }
.cell.peer { background: var(--peer); }
.cell.same { background: var(--same); }
.cell.sel { background: var(--sel); }
.cell.wrong { color: var(--error); }
.cell.wrong::after {
  content: "";
  position: absolute;
  left: 22%; right: 22%; bottom: 12%;
  height: 2px;
  background: var(--error);
}
.cell.shown { color: var(--muted); font-style: italic; }

.notes {
  position: absolute;
  inset: 5%;
  display: grid;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
  place-items: center;
  font-size: calc(var(--size) / 9 * .23);
  font-weight: 400;
  color: var(--fg);
  pointer-events: none;
}
.notes[hidden] { display: none; }
.notes span { visibility: hidden; }
.notes span.on { visibility: visible; }
.val { pointer-events: none; }

.board-overlay {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  color: var(--muted);
  font-size: 15px;
}
.board-wrap.loading .board-overlay { display: flex; }

.spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--line);
  border-top-color: var(--fg);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Steuerung ---------- */

.panel {
  width: var(--size);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.actions {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 2px;
}

.actions button {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 3px 0 3px;
  border: 0;
  border-radius: 3px;
  background: none;
  font-size: 11px;
  letter-spacing: .01em;
  cursor: pointer;
}
.actions svg, .key svg {
  width: 20px; height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.actions button:active { background: var(--btn-hover); }

.pad {
  display: grid;
  grid-template-columns: 1.15fr repeat(5, 1fr);
  grid-template-rows: 40px 40px;
  gap: 6px;
}

.key {
  display: grid;
  place-items: center;
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  background: var(--btn);
  font-size: 20px;
  font-weight: 500;
  padding: 0;
  cursor: pointer;
  transition: background .08s;
}
.key:active { background: var(--sel); }
.key-undo { grid-row: span 2; }
.key.done { color: var(--line); }

.modes {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 28px;
}
.modes button {
  height: 30px;
  padding: 0 2px;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: none;
  font-size: 16px;
  color: var(--muted);
  cursor: pointer;
}
.modes button[aria-pressed="true"] { color: var(--fg); font-weight: 600; border-bottom-color: var(--fg); }

.kbd-hint { display: none; }

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 1px 5px;
  border: 1px solid var(--btn-border);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--btn);
  font: inherit;
  font-size: .82em;
  text-align: center;
}

.foot {
  flex: none;
  padding: 2px 10px 4px;
  text-align: center;
  font-size: 11px;
  color: var(--muted);
}

/* ---------- Maus/Tastatur vorhanden ---------- */

@media (hover: hover) {
  .actions button:hover { background: var(--btn); }
  .key:hover { background: var(--btn-hover); }
  .modes button:not([aria-pressed="true"]):hover { color: var(--fg); }
}

/* ---------- Querformat: Steuerung neben dem Spielfeld ---------- */

@media (min-width: 700px) and (min-aspect-ratio: 11/10) {
  :root {
    --side: 268px;
    --size: max(260px, min(100vw - var(--side) - 72px - env(safe-area-inset-left) - env(safe-area-inset-right), 100dvh - var(--top-h) - 52px - env(safe-area-inset-top) - env(safe-area-inset-bottom), 680px));
  }
  .top { max-width: calc(var(--size) + var(--side) + 72px); padding: 0 16px; }
  .game {
    grid-template-columns: var(--size) var(--side);
    grid-template-areas: "board actions" "board panel";
    align-content: center;
    gap: 16px 40px;
    padding: 0 16px 8px;
  }
  .board-wrap { grid-area: board; }
  .actions { grid-area: actions; align-self: end; }
  .panel { grid-area: panel; align-self: start; }
  .panel { width: var(--side); gap: 16px; }
  .actions { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .actions button { padding: 10px 0 8px; font-size: 12.5px; gap: 3px; }
  .actions svg, .key svg { width: 23px; height: 23px; }
  .pad { grid-template-columns: repeat(6, 1fr); grid-template-rows: repeat(4, 52px); gap: 8px; }
  .key[data-digit] { grid-column: span 2; font-size: 26px; }
  .key-undo { grid-row: 4; grid-column: 1 / span 3; }
  .key-erase { grid-row: 4; grid-column: 4 / span 3; }
}

/* Querformat auf niedrigen Bildschirmen (iPhone quer) */
@media (min-width: 700px) and (min-aspect-ratio: 11/10) and (max-height: 520px) {
  :root { --top-h: 40px; --side: 250px; }
  :root { --size: max(220px, min(100vw - var(--side) - 72px - env(safe-area-inset-left) - env(safe-area-inset-right), 100dvh - var(--top-h) - 16px - env(safe-area-inset-top) - env(safe-area-inset-bottom))); }
  .logo { height: 26px; }
  .brand-sub, .foot { display: none; }
  .game { gap: 6px 24px; padding-bottom: 4px; }
  .panel { gap: 6px; }
  .actions { grid-template-columns: repeat(6, 1fr); gap: 0; }
  .actions button { padding: 3px 0; font-size: 0; gap: 0; }
  .pad { grid-template-rows: repeat(4, minmax(34px, calc((100dvh - 190px) / 4))); gap: 5px; }
  .modes button { height: 26px; }
  .actions svg { width: 20px; height: 20px; }
}

@media (hover: hover) and (min-width: 700px) {
  .kbd-hint {
    display: block;
    position: absolute;
    top: calc(100% + 8px);
    left: 0; right: 0;
    text-align: center;
    font-size: 12px;
    color: var(--muted);
  }
}

/* ---------- Textseite (Impressum, Datenschutz) ---------- */

body.doc { overscroll-behavior: auto; }
body.doc .top { max-width: 680px; padding: 0 16px; }
.back { font-size: 14px; }
.page {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: 8px 16px 48px;
  font-size: 15.5px;
  line-height: 1.6;
}
.page h1 { margin: 36px 0 12px; font-size: 24px; font-weight: 700; line-height: 1.2; }
.page h1:first-child { margin-top: 16px; }
.page h2 { margin: 26px 0 6px; font-size: 13px; font-weight: 600; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.page p, .page ul { margin: 0 0 12px; }
.page ul { padding-left: 20px; }
.page li { margin-bottom: 4px; }
.page code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; }
.page .keys { margin-bottom: 12px; font-size: inherit; }
.page .keys td:first-child { width: auto; padding-right: 16px; }
.page mark { background: #ffe680; color: #111; padding: 0 3px; }
.page-back { margin-top: 36px; }

/* ---------- Dialoge ---------- */

dialog {
  width: min(400px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  padding: 22px 22px 18px;
  border: 1px solid var(--btn-border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  box-shadow: var(--shadow);
  overflow-y: auto;
}
dialog.dlg-wide { width: min(520px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(0, 0, 0, .45); }

dialog h2 { margin: 0 0 12px; font-size: 21px; font-weight: 700; outline: none; }
dialog h3 { margin: 20px 0 6px; font-size: 13px; font-weight: 600; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.dlg-text { margin: 0 0 8px; }
.dlg-text.small { font-size: 13px; color: var(--muted); line-height: 1.55; }

/* Hauptknopf steht im HTML zuerst (Enter löst ihn aus) und wird rechts angezeigt */
.dlg-buttons { display: flex; flex-direction: row-reverse; justify-content: flex-start; gap: 8px; margin-top: 20px; }

.btn {
  height: 42px;
  padding: 0 18px;
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  background: var(--btn);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
}
.btn-primary { background: var(--fg); border-color: var(--fg); color: var(--bg); font-weight: 600; }

.levels { margin: 0; padding: 0; border: 0; display: grid; gap: 6px; }
.levels legend { padding: 0; margin-bottom: 8px; font-size: 13px; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }
.levels label {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 40px;
  padding: 0 14px;
  border: 1px solid var(--btn-border);
  border-radius: 3px;
  cursor: pointer;
}
.levels input { position: absolute; opacity: 0; pointer-events: none; }
.levels label:has(input:checked) { background: var(--fg); border-color: var(--fg); color: var(--bg); font-weight: 600; }
.levels label:has(input:checked) .dots i { background: color-mix(in srgb, var(--bg) 30%, var(--fg)); }
.levels label:has(input:checked) .dots i.on { background: var(--bg); }
.levels label:has(input:focus-visible) { outline: 2px solid var(--fg); outline-offset: 2px; }

.option { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; }
.option input { width: 18px; height: 18px; margin: 2px 0 0; flex: none; accent-color: var(--fg); }

.rules { margin: 0; padding-left: 20px; display: grid; gap: 6px; }

.keys { width: 100%; border-collapse: collapse; font-size: 14px; }
.keys td { padding: 5px 0; vertical-align: top; }
.keys td:first-child { width: 42%; white-space: nowrap; }
.keys kbd { margin-right: 2px; }

/* ---------- Hinweis ---------- */

.toast {
  position: fixed;
  left: 50%;
  top: calc(var(--top-h) + 10px + env(safe-area-inset-top));
  transform: translate(-50%, -12px);
  width: max-content;
  max-width: calc(100vw - 32px);
  padding: 10px 18px;
  border-radius: 4px;
  background: var(--fg);
  color: var(--bg);
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 10;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2s; }
  .toast, .key { transition: none; }
}