/* DawnSky Writing Gym — dark, minimal, mobile-first.
 *
 * Colors default to a dark palette but are overridden at runtime from
 * Telegram.WebApp.themeParams (see app.js applyTheme()), which writes the
 * --tg-* custom properties. Everything below reads those with a fallback. */

:root {
  --tg-bg: #17212b;            /* Telegram bg_color fallback (dark) */
  --tg-text: #f5f5f5;          /* text_color */
  --tg-hint: #8a9aa9;          /* hint_color */
  --tg-link: #6ab3f3;          /* link_color */
  --tg-button: #5288c1;        /* button_color */
  --tg-button-text: #ffffff;   /* button_text_color */
  --tg-secondary-bg: #232e3c;  /* secondary_bg_color */

  /* Semantic feedback bands (grade 1..4). */
  --band-fail: #e0584f;
  --band-soft: #e0a23f;
  --band-pass: #4fb3a0;
  --band-strong: #57c06b;

  --gap: 16px;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--tg-bg);
  color: var(--tg-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;             /* don't bounce the page while drawing */
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100%;
  /* respect the iOS safe area / Telegram header inset */
  padding: max(12px, env(safe-area-inset-top)) 16px max(16px, env(safe-area-inset-bottom));
  gap: var(--gap);
}

/* ---- top bar ---------------------------------------------------------- */
#topbar {
  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.progress {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--tg-hint);
  font-variant-numeric: tabular-nums;
}

.ghost-btn {
  background: transparent;
  color: var(--tg-hint);
  border: 1px solid color-mix(in srgb, var(--tg-hint) 40%, transparent);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.ghost-btn:active { opacity: 0.6; }

/* ---- prompt ----------------------------------------------------------- */
.prompt-card {
  width: 100%;
  max-width: 480px;
  text-align: center;
}

.pill {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tg-hint);
  background: var(--tg-secondary-bg);
  border-radius: 999px;
  padding: 4px 10px;
  margin-bottom: 10px;
}

.prompt {
  font-size: clamp(20px, 6vw, 28px);
  font-weight: 600;
  line-height: 1.25;
  word-break: break-word;
}

/* ---- the writing stage ----------------------------------------------- */
.stage {
  width: 100%;
  max-width: 480px;
  display: flex;
  justify-content: center;
}

/* The writer box is square and as large as the viewport comfortably allows.
 * HanziWriter draws an SVG/canvas sized to this box (see app.js). */
.writer {
  position: relative;
  width: min(78vw, 320px);
  aspect-ratio: 1 / 1;
  background: var(--tg-secondary-bg);
  border-radius: var(--radius);
  /* a subtle mizige (田) guide grid via gradients, behind the strokes */
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--tg-hint) 18%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--tg-hint) 18%, transparent) 1px, transparent 1px);
  background-position: center;
  background-size: 100% 100%;
  touch-action: none;        /* let HanziWriter own pointer/touch gestures */
  overflow: hidden;
}
/* center cross-hair of the practice grid */
.writer::before,
.writer::after {
  content: "";
  position: absolute;
  background: color-mix(in srgb, var(--tg-hint) 14%, transparent);
}
.writer::before { left: 0; right: 0; top: 50%; height: 1px; }
.writer::after  { top: 0; bottom: 0; left: 50%; width: 1px; }

/* ---- feedback --------------------------------------------------------- */
.feedback {
  width: 100%;
  max-width: 480px;
  text-align: center;
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 15px;
  background: var(--tg-secondary-bg);
  border-left: 4px solid var(--tg-hint);
}
.feedback .grade { font-weight: 700; font-size: 18px; }
.feedback.band-1 { border-left-color: var(--band-fail); }
.feedback.band-2 { border-left-color: var(--band-soft); }
.feedback.band-3 { border-left-color: var(--band-pass); }
.feedback.band-4 { border-left-color: var(--band-strong); }
.feedback.free   { border-left-color: var(--tg-link); }

/* ---- status / errors -------------------------------------------------- */
.status {
  width: 100%;
  max-width: 480px;
  text-align: center;
  color: var(--tg-hint);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  margin-top: 8px;
}
.status-msg { font-size: 15px; line-height: 1.5; }
.status-msg strong { color: var(--tg-text); }

.primary-btn {
  background: var(--tg-button);
  color: var(--tg-button-text);
  border: none;
  border-radius: 999px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.primary-btn:active { opacity: 0.8; }

/* small helper to fade content in */
[hidden] { display: none !important; }