/*
 * Design tokens — pure CSS custom properties, no framework, no image/font/SVG
 * assets. Light is the default; dark is applied either by the OS
 * (prefers-color-scheme) or by an explicit [data-theme] set from Settings. A
 * Telegram Mini App can override these same variables at runtime from
 * WebApp.themeParams (see lib/theme — SDK wiring lands in the Telegram stage), so
 * the whole UI re-themes without touching components.
 */
:root {
  --bg: #f3f4f6;
  --bg-elev: #ffffff;
  --surface: #ffffff;
  --surface-2: #eef0f3;
  --ad-bg: #e3e7ee; /* announcement banner: a subtle accent, darker in light theme */
  --text: #14181f;
  --text-muted: #6b7280;
  --border: #d8dce2;
  --accent: #2f6df6;
  --accent-text: #ffffff;
  --danger: #d6453d;
  --ok: #1f9d57;
  --warn: #c9881b;

  /* board + tiles (all drawn with CSS primitives) */
  --board-bg: #cdd6cf;
  --cell-bg: #e7ece8;
  --cell-line: #7f8d83;
  --tile-bg: #f4e2b8;
  --tile-edge: #d8c190;
  --tile-text: #2a2113;
  --tile-pending: #f2cf73;
  /* In-composition highlight of the staged play (see game/Board.svelte): a calm reddish-pink
     when the tiles form no word, a light green for the player's own tiles once they do, a
     deeper green for the board tiles a formed word runs through, and the orange move-score
     badge. Tuned per theme; refined on the contour. */
  --tile-pending-illegal: #f2c7bf;
  --tile-pending-legal: #c9e7bd;
  --tile-formed: #a5cf93;
  --score-badge: #e5811d;
  /* Last-word highlight letter — a lighter burgundy than the dark theme on purpose: against
     the lighter tile the perceived contrast needs it, so the two are tuned per theme. */
  --tile-recent: #9c5849;
  --prem-tw: #e06a5b; /* triple word */
  --prem-dw: #efa6a0; /* double word + centre */
  --prem-tl: #4f8fd6; /* triple letter */
  --prem-dl: #a8cdec; /* double letter */
  --prem-text: #2a2113;

  /* shape + type */
  --radius: 10px;
  --radius-sm: 6px;
  --gap: 8px;
  --pad: 12px;
  /* Height Telegram's native nav overlays at the top in fullscreen; set from the SDK's
     content-safe-area inset, 0 elsewhere. */
  --tg-content-top: 0px;
  /* Device safe-area top (the notch / status bar); inside Telegram TG's own nav controls sit between
     it and --tg-content-top, so the in-app header aligns to that band. Inside Telegram these are set
     from the SDK (lib/app.svelte.ts); on the native Capacitor build the value is the SystemBars core
     plugin's injected --safe-area-inset-* — correct on EVERY Android WebView, including the < 140
     versions where env(safe-area-inset-*) wrongly reports 0 under Android's mandatory edge-to-edge and
     the app chrome would otherwise draw under the system bars. It falls back to the CSS env() safe area
     on iOS / PWA / a plain browser tab (0 there). */
  --tg-safe-top: var(--safe-area-inset-top, env(safe-area-inset-top, 0px));
  /* Device safe-area bottom / sides (home indicator; landscape notch) — the screen pads its bottom
     and left/right edges by these so content clears the cut-outs (e.g. the gesture-nav home indicator
     or the VK mobile home bar). */
  --tg-safe-bottom: var(--safe-area-inset-bottom, env(safe-area-inset-bottom, 0px));
  --tg-safe-left: var(--safe-area-inset-left, env(safe-area-inset-left, 0px));
  --tg-safe-right: var(--safe-area-inset-right, env(safe-area-inset-right, 0px));
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", "Liberation Sans", sans-serif;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.08), 0 6px 16px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --bg-elev: #171a21;
    --surface: #171a21;
    --surface-2: #1f242d;
    --ad-bg: #272f3c; /* announcement banner: a subtle accent, lighter in dark theme */
    --text: #e7eaf0;
    --text-muted: #9aa3b2;
    --border: #2a313c;
    --accent: #5b8cff;
    --accent-text: #0b0e13;
    --danger: #f0635a;
    --ok: #44c87f;
    --warn: #e0a93a;

    --board-bg: #2a3330;
    --cell-bg: #222a27;
    --cell-line: #56655c;
    --tile-bg: #cdba88;
    --tile-edge: #b6a473;
    --tile-text: #20190d;
    --tile-pending: #d8b75e;
    --tile-pending-illegal: #d8a99f;
    --tile-pending-legal: #a9cf94;
    --tile-formed: #83b571;
    --score-badge: #e88f31;
    --tile-recent: #8c4a3c;
    --prem-tw: #9c3f34; /* 3x word: a touch darker red */
    --prem-dw: #a8636b; /* 2x word: softer, pinker */
    --prem-tl: #2c527a; /* 3x letter: a touch darker blue */
    --prem-dl: #4a779b; /* 2x letter: softer, sky blue */
    --prem-text: #e7eaf0;
  }
}

/* Explicit dark chosen in Settings (overrides OS preference). */
:root[data-theme="dark"] {
  --bg: #0f1115;
  --bg-elev: #171a21;
  --surface: #171a21;
  --surface-2: #1f242d;
  --ad-bg: #272f3c; /* announcement banner: a subtle accent, lighter in dark theme */
  --text: #e7eaf0;
  --text-muted: #9aa3b2;
  --border: #2a313c;
  --accent: #5b8cff;
  --accent-text: #0b0e13;
  --danger: #f0635a;
  --ok: #44c87f;
  --warn: #e0a93a;
  --board-bg: #2a3330;
  --cell-bg: #222a27;
  --cell-line: #38433d;
  --tile-bg: #d9c79a;
  --tile-edge: #b6a473;
  --tile-text: #20190d;
  --tile-pending: #f0d98f;
  --tile-pending-illegal: #d8a99f;
  --tile-pending-legal: #a9cf94;
  --tile-formed: #83b571;
  --score-badge: #e88f31;
  /* Last-word highlight letter — a warm burgundy whose red hue stays distinct from both the
     near-black glyph and the warm tile. The light theme uses a lighter burgundy (tuned per
     theme; perceived contrast depends on the surrounding board). */
  --tile-recent: #8c4a3c;
  --prem-tw: #9c3f34; /* 3x word: a touch darker red */
  --prem-dw: #a8636b; /* 2x word: softer, pinker */
  --prem-tl: #2c527a; /* 3x letter: a touch darker blue */
  --prem-dl: #4a779b; /* 2x letter: softer, sky blue */
  --prem-text: #e7eaf0;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* Stop iOS/Safari from auto-inflating text (e.g. the long marquee message). */
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  /* never let the page scroll/zoom out from under the board */
  overscroll-behavior: none;
  touch-action: manipulation;
}

/* The game SPA (main.ts adds .app-shell to <html>) pins the document so iOS/WKWebView — notably
   the Telegram Mini App — cannot rubber-band ("stretch") the whole page on a vertical drag;
   overscroll-behavior alone does not stop the root-document bounce there. Every screen fits the
   visual viewport (--vvh) and scrolls its own inner areas, so the document never needs to
   scroll. The standalone landing page (landing.ts) omits the class and scrolls normally. */
html.app-shell {
  overflow: hidden;
}
html.app-shell body {
  position: fixed;
  /* Follow the visual viewport (top + height), not merely fill the layout viewport: iOS Safari /
     WKWebView does not shrink the layout viewport for the soft keyboard — it offsets the visual
     viewport down toward the focused field — so a top-anchored (inset:0) shell would misalign, showing
     empty space below the content (worst on a repeat focus). --vv-top / --vvh are kept in sync from
     app.svelte.ts (syncViewport). The fallbacks equal inset:0 before the first sync / on the landing. */
  top: var(--vv-top, 0px);
  left: 0;
  right: 0;
  height: var(--vvh, 100%);
  overflow: hidden;
}

#app {
  height: 100%;
  /* No text selection anywhere by default; inputs opt back in below. */
  user-select: none;
  -webkit-user-select: none;
  /* No tap-highlight flash on tappable elements. Android in-app WebViews (Telegram, VK) draw a
     momentary selection-like box on a clickable node on tap — seen on the header title and the
     back chevron; user-select does not govern it. Inherited, so this clears it app-wide. */
  -webkit-tap-highlight-color: transparent;
}

input,
textarea {
  user-select: text;
  -webkit-user-select: text;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.reduce-motion * {
  animation-duration: 0.001ms !important;
  transition-duration: 0.001ms !important;
}
