@layer reset, tokens, base, components, utilities;

/* ── Reset ── */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
}

/* ── Tokens ── */
@layer tokens {
  :root {
    --bg-base: #f5f0e8;        /* warm parchment */
    --bg-panel: #faf7f2;       /* card/panel surface */
    --bg-hint: #f0ead6;        /* hint panel — old paper */
    --text-primary: #3d3225;   /* dark warm brown */
    --text-secondary: #6b5d4d; /* muted brown — ≥ 4.5:1 on --bg-base */
    --color-apple: #c1493a;
    --color-bread: #c49a3c;
    --color-flower: #8e6baa;
    --color-coin: #d4a843;     /* gold */
    --color-positive: #5a8a3c; /* muted green — profit */
    --color-accent: #6b8e5a;   /* earthy green — buttons */
    --shadow-soft: 0 2px 8px rgba(61, 50, 37, 0.08);
    --shadow-medium: 0 4px 16px rgba(61, 50, 37, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --space-1: 4px; --space-2: 8px; --space-3: 12px;
    --space-4: 16px; --space-6: 24px; --space-8: 32px;
    --text-sm: 0.875rem; --text-base: 1rem; --text-lg: 1.125rem;
    --text-xl: 1.25rem; --text-2xl: 1.5rem; --text-3xl: 2rem; --text-4xl: 2.5rem;
    --duration-fast: 150ms;
    --duration-normal: 250ms;
  }
}

/* ── Base ── */
@layer base {
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    font-size: var(--text-base);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-base);
    background-image:
      radial-gradient(ellipse at 20% 50%, rgba(107, 142, 90, 0.03) 0%, transparent 50%),
      radial-gradient(ellipse at 80% 20%, rgba(212, 168, 67, 0.04) 0%, transparent 50%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-xl); }
  button, a, [role="button"] { touch-action: manipulation; }
}

/* ── Components ── */
@layer components {
  .page {
    min-height: 100dvh;
    padding: var(--space-4) var(--space-6);
    max-width: 480px;
    margin: 0 auto;
  }

  /* Top bar */
  .top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--bg-panel);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-soft);
    margin-bottom: var(--space-3);
  }
  .top-bar h1 { font-size: var(--text-base); font-weight: 600; }

  .coin-count, .storage-count {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-variant-numeric: tabular-nums;
    background: rgba(61, 50, 37, 0.06);
    padding: 2px var(--space-2);
    border-radius: 999px;
    font-size: var(--text-sm);
  }
  .coin-count { font-weight: 700; color: var(--color-coin); }
  .storage-count { color: var(--text-secondary); }

  .btn-mute {
    background: transparent;
    border: none;
    font-size: var(--text-lg);
    padding: var(--space-1);
    min-width: 36px;
    min-height: 36px;
    border-radius: var(--radius-sm);
  }
  .btn-mute:hover { background: rgba(61, 50, 37, 0.06); }

  /* Hint panel */
  .hint-panel {
    background: var(--bg-hint);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent);
    padding: var(--space-4);
    margin: var(--space-3) 0;
    font-style: italic;
    line-height: 1.6;
  }
  .hint-failed {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--space-2);
    text-decoration: line-through;
    opacity: 0.7;
  }
  .hint-failed::before { content: "— "; }

  /* Goods list */
  .goods-list { display: flex; flex-direction: column; gap: var(--space-3); }

  .good-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    background: var(--bg-panel);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-soft);
    transition: transform var(--duration-fast), box-shadow var(--duration-fast);
  }
  .good-icon { width: 36px; height: 36px; flex-shrink: 0; }
  .good-name { font-weight: 500; }
  .good-info { display: flex; align-items: center; gap: var(--space-2); }
  .good-prices { margin-left: auto; display: flex; flex-direction: column; gap: 2px; font-variant-numeric: tabular-nums; text-align: right; flex-shrink: 0; }
  .good-holding {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    background: rgba(61, 50, 37, 0.06);
    padding: 1px var(--space-2);
    border-radius: 999px;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
  }
  .good-price { font-variant-numeric: tabular-nums; font-weight: 600; }
  .good-price-secondary { font-size: var(--text-sm); color: var(--text-secondary); font-weight: 400; font-variant-numeric: tabular-nums; }
  .price-up { color: var(--color-positive); font-weight: 700; }
  .price-down { color: var(--color-apple); font-weight: 700; }
  .good-actions { display: flex; align-items: center; gap: var(--space-3); }
  .buy-group { display: flex; align-items: center; gap: var(--space-2); }
  .buy-qty {
    min-width: 1.5rem;
    text-align: center;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
  }

  /* Inventory bar */
  .inventory-bar {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) 0;
    flex-wrap: wrap;
  }
  .inv-item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    background: rgba(61, 50, 37, 0.06);
    padding: 2px var(--space-2);
    border-radius: 999px;
    font-size: var(--text-sm);
    font-weight: 500;
  }

  /* Error toast */
  .error-toast {
    background: #fff3cd;
    color: #664d03;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-medium);
    margin: var(--space-3) 0;
    font-size: var(--text-sm);
    font-weight: 500;
    position: relative;
    z-index: 20;
  }

  /* Action bar */
  .action-bar {
    display: flex;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-6) 0 var(--space-4);
  }

  /* Buttons — 44px minimum touch target */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    min-width: 44px;
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    box-shadow: var(--shadow-soft);
    transition: background-color var(--duration-fast), transform var(--duration-fast);
    -webkit-tap-highlight-color: transparent;
  }
  .btn-primary {
    background-color: var(--color-accent);
    color: white;
    font-size: var(--text-lg);
    padding: var(--space-3) var(--space-6);
  }
  .btn-secondary {
    background-color: var(--bg-panel);
    color: var(--text-primary);
    border: 1px solid rgba(61, 50, 37, 0.2);
    box-shadow: none;
  }
  .btn-buy { background-color: var(--color-positive); color: white; }
  .btn-sell { background-color: var(--color-coin); color: var(--text-primary); }
  .btn-quantity {
    background-color: var(--bg-panel);
    color: var(--text-primary);
    min-width: 44px;
    padding: var(--space-2);
    border: 1px solid rgba(61, 50, 37, 0.15);
    border-radius: 999px;
    box-shadow: none;
  }
  .btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
  .btn:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }
  .confirm-state { background-color: #c1493a !important; }

  /* End-of-run screen */
  .end-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-6);
    padding: var(--space-8) var(--space-6);
    max-width: 480px;
    margin: 0 auto;
    min-height: 100dvh;
    justify-content: center;
  }
  .score-display { font-size: var(--text-2xl); font-weight: 700; text-align: center; }
  .score-value {
    font-size: var(--text-4xl);
    font-weight: 700;
    color: var(--color-coin);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
  }
  .score-bracket {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.6;
  }
  .new-best {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-positive);
    background: rgba(90, 138, 60, 0.08);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
  }
  .share-section { display: flex; flex-direction: column; align-items: center; gap: var(--space-2); }
  .share-url {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    word-break: break-all;
    user-select: all;
    background: var(--bg-panel);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    max-width: 100%;
  }
  .run-summary {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    color: var(--text-secondary);
    font-size: var(--text-sm);
  }
  .btn-play-again {
    font-size: var(--text-lg);
    padding: var(--space-4) var(--space-8);
    width: 100%;
    max-width: 320px;
    box-shadow: var(--shadow-medium);
  }

  /* Update banner */
  .update-banner {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: var(--bg-hint);
    color: var(--text-primary);
    text-align: center;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    z-index: 1000;
    border-top: 1px solid rgba(61, 50, 37, 0.15);
    box-shadow: 0 -2px 8px rgba(61, 50, 37, 0.08);
  }
  .update-banner button {
    margin-left: var(--space-2);
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--space-1) var(--space-3);
    cursor: pointer;
    font-weight: 600;
    min-height: 44px;
  }
}

/* ── Utilities ── */
@layer utilities {
  .mt-4 { margin-top: var(--space-4); }

  .skip-to-content {
    position: absolute;
    left: -9999px; top: auto;
    width: 1px; height: 1px;
    overflow: hidden;
    z-index: 100;
    background: var(--bg-panel);
    color: var(--text-primary);
    padding: var(--space-2) var(--space-4);
    border-radius: 0 0 var(--radius-md) 0;
    font-weight: 600;
    text-decoration: none;
  }
  .skip-to-content:focus {
    position: fixed; top: 0; left: 0;
    width: auto; height: auto;
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }
}

/* ── Micro-animations (motion-safe only) ── */
@media (prefers-reduced-motion: no-preference) {
  .good-row:hover { transform: translateY(-1px); box-shadow: var(--shadow-medium); }
  .btn:active:not(:disabled) { transform: scale(0.97); }
  .error-toast { animation: fadeIn var(--duration-normal) ease-out; }
  .score-value { animation: fadeInUp 0.4s ease-out; }
  .day-transition { animation: dayFade 400ms ease; }

  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  @keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }
  @keyframes dayFade {
    0% { opacity: 0.3; }
    100% { opacity: 1; }
  }
}

/* ── Accessibility: reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  :root { --duration-fast: 0ms; --duration-normal: 0ms; }
  *, *::before, *::after {
    animation-duration: 0ms !important;
    transition-duration: 0ms !important;
  }
}

/* ── Accessibility: high contrast ── */
@media (prefers-contrast: more) {
  :root { --text-primary: #000; --text-secondary: #333; --bg-base: #fff; --bg-panel: #f0f0f0; }
  .btn { border: 2px solid #000; }
  .good-row { border: 1px solid #666; }
  .hint-panel { border: 1px solid #666; }
}

/* ── Mobile (≤ 480px) ── */
@media (max-width: 480px) {
  .page { padding: var(--space-3); }
  .top-bar { flex-wrap: wrap; gap: var(--space-1); padding: var(--space-2) var(--space-3); }
  .good-row { padding: var(--space-3); }
  .good-actions { flex-wrap: wrap; }
  .btn-buy, .btn-sell { padding: var(--space-2) var(--space-3); font-size: var(--text-sm); }
  .btn-quantity { min-width: 36px; min-height: 36px; padding: var(--space-1); }
  .action-bar {
    position: sticky;
    bottom: 0;
    background: var(--bg-base);
    padding: var(--space-3) 0 var(--space-4);
    box-shadow: 0 -2px 8px rgba(61, 50, 37, 0.06);
    z-index: 10;
  }
  .action-bar .btn { flex: 1; }
  .end-screen { padding: var(--space-6) var(--space-3); }
  .btn-play-again { max-width: 100%; }
}

/* ── Tablet (481px – 768px) ── */
@media (min-width: 481px) {
  .page { max-width: 640px; }
  .end-screen { max-width: 560px; }
}

/* ── Desktop (769px+) ── */
@media (min-width: 769px) {
  .page {
    max-width: 960px;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-4);
    align-content: start;
  }
  .top-bar { grid-column: 1 / -1; }
  .hint-panel { grid-column: 1; grid-row: 2; align-self: start; }
  .goods-list { grid-column: 2; grid-row: 2 / 5; }
  .inventory-bar { grid-column: 1; grid-row: 3; align-self: start; }
  .error-toast { grid-column: 1 / -1; }
  .action-bar { grid-column: 1; grid-row: 4; align-self: end; }
  .end-screen { max-width: 600px; }
}