/* ═══════════════════════════════════════════════════════════
   Weave — Stylesheet
   Palette: warm paper, ink, vermillion (active trace),
            teal (completed words), gold (hint).
   ═══════════════════════════════════════════════════════════ */

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

:root {
  --paper:        #FBF7F0;
  --paper-deep:    #F4EEE2;
  --ink:          #1C1B1A;
  --ink-soft:     #5B564D;
  --ink-faint:    #8C8779;

  --vermillion:    #E8543E;
  --vermillion-dk: #B23A28;
  --teal:          #2D7D6E;
  --teal-dk:       #1D5249;
  --teal-tint:     #E2F0EC;
  --gold:          #F2C94C;
  --gold-dk:       #8A6A10;

  --wall:          #DCD0B4;
  --wall-dk:       #C9BA98;
  --tile-bg:       #FFFFFF;
  --tile-border:   rgba(28,27,26,0.12);
  --tile-border-strong: rgba(28,27,26,0.24);

  --card-border:   rgba(28,27,26,0.10);
  --shadow-soft:   0 1px 2px rgba(28,27,26,0.06), 0 4px 16px rgba(28,27,26,0.06);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --d1-bg:#e1f5ee; --d1-c:#0f6e56; --d1-br:#5dcaa5;
  --d2-bg:#e6f1fb; --d2-c:#185fa5; --d2-br:#85b7eb;
  --d3-bg:#fbf3da; --d3-c:#8a6a10; --d3-br:#e3bf5e;
  --d4-bg:#faece7; --d4-c:#993c1d; --d4-br:#f0997b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:        #18160F;
    --paper-deep:    #100E0A;
    --ink:          #F2EEE3;
    --ink-soft:     #C9C2B0;
    --ink-faint:    #8F8978;

    --vermillion:    #F0694F;
    --vermillion-dk: #FF8A6E;
    --teal:          #4FAE9B;
    --teal-dk:       #6FCBB8;
    --teal-tint:     #18302B;
    --gold:          #F2C94C;
    --gold-dk:       #F2C94C;

    --wall:          #2E2A1F;
    --wall-dk:       #211E16;
    --tile-bg:       #221F17;
    --tile-border:   rgba(242,238,227,0.12);
    --tile-border-strong: rgba(242,238,227,0.26);

    --card-border:   rgba(242,238,227,0.10);
    --shadow-soft:   0 1px 2px rgba(0,0,0,0.3), 0 4px 20px rgba(0,0,0,0.35);

    --d1-bg:#04342c; --d1-c:#5dcaa5; --d1-br:#0f6e56;
    --d2-bg:#042c53; --d2-c:#85b7eb; --d2-br:#185fa5;
    --d3-bg:#3a2c05; --d3-c:#e3bf5e; --d3-br:#8a6a10;
    --d4-bg:#4a1b0c; --d4-c:#f0997b; --d4-br:#993c1d;
  }
}

html { -webkit-text-size-adjust: 100%; touch-action: none; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  overflow-x: hidden;
}

/* Subtle paper texture via layered radial gradients (no images needed) */
.paper-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 18% 24%, rgba(28,27,26,0.025) 0, transparent 38%),
    radial-gradient(circle at 82% 12%, rgba(28,27,26,0.022) 0, transparent 42%),
    radial-gradient(circle at 65% 78%, rgba(28,27,26,0.025) 0, transparent 40%),
    radial-gradient(circle at 8% 85%, rgba(28,27,26,0.02) 0, transparent 35%);
}

@media (prefers-color-scheme: dark) {
  .paper-bg {
    background-image:
      radial-gradient(circle at 18% 24%, rgba(255,255,255,0.018) 0, transparent 38%),
      radial-gradient(circle at 82% 12%, rgba(255,255,255,0.015) 0, transparent 42%),
      radial-gradient(circle at 65% 78%, rgba(255,255,255,0.018) 0, transparent 40%),
      radial-gradient(circle at 8% 85%, rgba(255,255,255,0.014) 0, transparent 35%);
  }
}

/* ══════════ Header ══════════ */
.site-header {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1rem;
}

.wordmark { display: flex; flex-direction: column; gap: 2px; }

.wordmark-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 5.5vw, 34px);
  letter-spacing: 0.005em;
  color: var(--ink);
  line-height: 1.05;
}

.wordmark-tag {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
}

.header-stats { display: flex; gap: 18px; flex-shrink: 0; }

.hstat { display: flex; flex-direction: column; align-items: center; gap: 0; }

.hstat-val {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.1;
}

.hstat-lbl {
  font-size: 10px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

/* ══════════ Layout ══════════ */
.app-main {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 0.5rem 1.5rem 4rem;
}

.screen { display: flex; flex-direction: column; align-items: center; gap: 1.75rem; }
.hidden { display: none !important; }

/* ══════════ Select Screen ══════════ */
.select-intro { text-align: center; max-width: 520px; margin: 1rem auto 0; }

.select-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 6vw, 40px);
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 0.75rem;
}

.select-sub {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  width: 100%;
}

.diff-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 1.25rem 1.1rem;
  background: var(--tile-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  cursor: pointer;
  text-align: left;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

.diff-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-tint, transparent) 0%, transparent 55%);
  opacity: 0.5;
  pointer-events: none;
}

.diff-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: var(--tile-border-strong);
}

.diff-card:active { transform: translateY(0) scale(0.98); }

.diff-badge {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  border: 1px solid;
  position: relative;
  z-index: 1;
}

.d1 { background: var(--d1-bg); color: var(--d1-c); border-color: var(--d1-br); }
.d2 { background: var(--d2-bg); color: var(--d2-c); border-color: var(--d2-br); }
.d3 { background: var(--d3-bg); color: var(--d3-c); border-color: var(--d3-br); }
.d4 { background: var(--d4-bg); color: var(--d4-c); border-color: var(--d4-br); }

.diff-card-size {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
  color: var(--ink);
  position: relative;
  z-index: 1;
}

.diff-card-words {
  font-size: 12px;
  color: var(--ink-faint);
  position: relative;
  z-index: 1;
}

.diff-preview {
  display: grid;
  gap: 2px;
  margin-top: 4px;
  position: relative;
  z-index: 1;
}

.diff-preview .pc {
  border-radius: 1.5px;
}
.diff-preview .pc.open { background: var(--tile-bg); border: 1px solid var(--tile-border); }
.diff-preview .pc.wall { background: var(--wall); }

.howto-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--ink-faint);
  font-size: 13px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  transition: color 0.12s, background 0.12s;
}
.howto-link:hover { color: var(--ink); background: rgba(28,27,26,0.04); }

.howto-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1px solid currentColor;
  font-size: 11px;
  font-weight: 600;
}

/* ══════════ Game Screen — toolbar ══════════ */
.game-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 10px;
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--tile-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s, transform 0.08s;
  -webkit-tap-highlight-color: transparent;
}
.tool-btn:hover { background: var(--paper-deep); color: var(--ink); border-color: var(--tile-border-strong); }
.tool-btn:active { transform: scale(0.93); }

.game-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.game-diff-pill {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 10px;
  border-radius: 20px;
  border: 1px solid;
}

.game-size {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--ink);
}

.toolbar-actions { display: flex; gap: 8px; }

/* ══════════ Board ══════════ */
.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
}

.board-stage {
  position: relative;
  display: inline-block;
}

.trace-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
  overflow: visible;
}

.grid {
  position: relative;
  z-index: 1;
  display: grid;
  touch-action: none;
}

.tile {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  background: var(--tile-bg);
  border: 1px solid var(--tile-border);
  border-radius: var(--tile-radius, 10px);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.12s, border-color 0.12s, color 0.12s, transform 0.08s;
}

.tile.wall {
  background: var(--wall);
  border-color: var(--wall-dk);
  cursor: default;
  pointer-events: none;
}

.tile.active-path {
  background: var(--vermillion);
  border-color: var(--vermillion);
  color: #FFF8F3;
  transform: scale(0.94);
}

.tile.solved {
  background: var(--teal);
  border-color: var(--teal);
  color: #F1FBF7;
}

.tile.hinted {
  background: var(--gold);
  border-color: var(--gold);
  color: #3A2C03;
}

.tile:not(.wall):not(.solved):hover {
  border-color: var(--tile-border-strong);
  background: var(--paper-deep);
}

@keyframes tile-pop {
  0% { transform: scale(1); }
  35% { transform: scale(1.14); }
  100% { transform: scale(1); }
}
.tile.just-solved { animation: tile-pop 0.32s ease; }

@keyframes tile-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}
.tile.shake { animation: tile-shake 0.32s ease; }

/* ══════════ Word slots ══════════ */
.word-slots {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  width: 100%;
  max-width: 460px;
}

.word-slot {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 10px;
  background: var(--tile-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  transition: background 0.2s, border-color 0.2s;
}

.word-slot.solved {
  background: var(--teal-tint);
  border-color: var(--teal);
}

.slot-letter {
  width: 20px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 14px;
  color: var(--ink-faint);
  border-bottom: 1.5px solid var(--tile-border-strong);
}

.word-slot.solved .slot-letter {
  color: var(--teal-dk);
  border-bottom-color: var(--teal);
}

.slot-letter.filled { color: var(--ink); border-bottom-color: var(--ink-soft); }

/* ══════════ Footer stats ══════════ */
.game-footer-stats {
  display: flex;
  gap: 32px;
  padding-top: 0.5rem;
}

.fstat { display: flex; flex-direction: column; align-items: center; gap: 2px; }

.fstat-val {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  color: var(--ink);
}

.fstat-lbl {
  font-size: 10px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ══════════ Buttons ══════════ */
.btn {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 11px 24px;
  border-radius: 11px;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: background 0.12s, transform 0.08s, opacity 0.12s;
  -webkit-tap-highlight-color: transparent;
  border: 1px solid transparent;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--vermillion);
  color: #FFF8F3;
}
.btn-primary:hover { background: var(--vermillion-dk); }

.btn-outline {
  background: transparent;
  border-color: var(--tile-border-strong);
  color: var(--ink);
}
.btn-outline:hover { background: var(--paper-deep); }

/* ══════════ Overlays ══════════ */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(28, 27, 26, 0.5);
  padding: 1.5rem;
  backdrop-filter: blur(2px);
}

.win-card, .howto-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 2rem 1.75rem;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.win-ink-burst {
  position: absolute;
  top: -40px;
  left: 50%;
  transform: translateX(-50%);
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--teal-tint) 0%, transparent 70%);
  pointer-events: none;
}

.win-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 30px;
  color: var(--ink);
  margin-bottom: 0.4rem;
  position: relative;
}

.win-sub {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 1.5rem;
  position: relative;
}

.win-stats {
  display: flex;
  justify-content: center;
  gap: 28px;
  padding: 1rem 0 1.5rem;
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
  margin-bottom: 1.5rem;
}

.win-stat { display: flex; flex-direction: column; align-items: center; gap: 2px; }

.win-stat-val {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  color: var(--ink);
}

.win-stat-lbl {
  font-size: 10px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.win-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.howto-card { text-align: left; }

.howto-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  font-size: 22px;
  line-height: 1;
  color: var(--ink-faint);
  cursor: pointer;
  border-radius: 8px;
}
.howto-close:hover { background: var(--paper-deep); color: var(--ink); }

.howto-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  color: var(--ink);
  margin-bottom: 1.1rem;
  padding-right: 1.5rem;
}

.howto-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-left: 1.3rem;
  margin-bottom: 1.5rem;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.howto-list li::marker { color: var(--vermillion); font-weight: 600; }
.howto-list strong { color: var(--ink); }

.howto-start { width: 100%; }

/* ══════════ Select-screen link row (How to play / About) ══════════ */
.select-links {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ══════════ Per-level win count on difficulty cards ══════════ */
.diff-card-won {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--teal);
  position: relative;
  z-index: 1;
}

/* ══════════ Ghost button (tertiary action) ══════════ */
.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--ink-faint);
  padding: 8px 16px;
}
.btn-ghost:hover { color: var(--ink); background: rgba(28,27,26,0.05); }

/* ══════════ "Results" floating reopen button ══════════ */
.results-fab {
  position: fixed;
  z-index: 40;
  left: 50%;
  bottom: calc(1.25rem + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 11px 20px;
  color: #FFF8F3;
  background: var(--teal);
  border: none;
  border-radius: 24px;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(28,27,26,0.22);
  transition: background 0.12s, transform 0.08s;
  -webkit-tap-highlight-color: transparent;
}
.results-fab:hover { background: var(--teal-dk); }
.results-fab:active { transform: translateX(-50%) scale(0.96); }

/* ══════════ About card ══════════ */
.about-card { text-align: center; }

.about-lead {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: 1.25rem;
}

.about-divider {
  height: 1px;
  background: var(--card-border);
  margin: 0 auto 1.25rem;
  width: 64px;
}

.about-credit {
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 0.2rem;
}
.about-credit strong { font-weight: 700; }

.about-studio {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--ink);
  margin-bottom: 0.75rem;
}

.about-meta {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.35rem;
}

.about-copy {
  font-size: 12px;
  color: var(--ink-faint);
  margin-bottom: 1.5rem;
}

.about-done { width: 100%; }

/* ══════════ Responsive ══════════ */
@media (max-width: 480px) {
  .site-header { padding: 1.5rem 1.25rem 0.75rem; }
  .app-main { padding: 0.5rem 1.25rem 3rem; }
  .header-stats { gap: 14px; }
  .game-footer-stats { gap: 20px; }
  .diff-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .diff-card { padding: 1rem 0.9rem; }
  .diff-card-size { font-size: 22px; }
}

@media (max-width: 360px) {
  .wordmark-text { font-size: 24px; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}