/* ═══════════════════════════════════════════════════════════════════════════
 * Kallisto Design System — Polish v4 (additive overlay)
 *
 * Goal: tighten consistency without touching existing rules.
 *   1. Add missing tokens: spacing scale, focus ring, disabled, overlays
 *   2. Normalize interactive states: :focus-visible, :disabled, aria-invalid
 *   3. Snap baseline heights for buttons / inputs / tags
 *   4. Refine elevation, table hover, themebar active state
 *
 * Loaded LAST so it can refine — never override — existing component rules.
 * Every rule below uses tokens; nothing hardcoded.
 * ═══════════════════════════════════════════════════════════════════════════ */

/* ── New tokens ────────────────────────────────────────────────────────── */
:root {
  /* Spacing — 4px base, harmonic across all surfaces */
  --space-0: 0;
  --space-1: 2px;
  --space-2: 4px;
  --space-3: 6px;
  --space-4: 8px;
  --space-5: 12px;
  --space-6: 16px;
  --space-7: 20px;
  --space-8: 24px;
  --space-9: 32px;
  --space-10: 40px;
  --space-11: 48px;
  --space-12: 64px;

  /* Intermediate radius slot for chips and small controls */
  --r-xs: 6px;

  /* ── Semantic layout tokens — named spacing for common patterns ────── */
  /* Card surfaces */
  --card-pad-y: var(--space-6);           /* 16px — vertical inset */
  --card-pad-x: 18px;                     /* horizontal inset (between 16/20) */
  --card-gap: var(--space-5);             /* 12px — gap between child elements */

  /* Page structure */
  --page-inset: var(--space-8);           /* 24px — page-level padding */
  --section-gap: var(--space-9);          /* 32px — between major sections */
  --content-max: 1200px;                  /* max readable content width */

  /* Shell dimensions — see tokens.css for --sidebar-w, --sidebar-collapsed-w, --topbar-h */

  /* Row patterns */
  --row-gap-tight: var(--space-3);        /* 6px — icon groups, tool buttons */
  --row-gap-default: var(--space-4);      /* 8px — standard inline gap */
  --row-gap-loose: var(--space-5);        /* 12px — between card children */
  --row-gap-wide: var(--space-6);         /* 16px — grid / section level */

  /* Control inline spacing */
  --icon-text-gap: var(--space-3);        /* 6px — icon ↔ label inside buttons */
  --control-inline-gap: var(--space-4);   /* 8px — between adjacent controls */
  --action-group-gap: var(--space-5);     /* 12px — action button groups */

  /* Interaction tokens */
  --focus-ring-color: oklch(0.68 0.18 295 / 0.32);
  --focus-ring: 0 0 0 3px var(--focus-ring-color);
  --focus-ring-tight: 0 0 0 2px var(--focus-ring-color);

  --hover-overlay: oklch(0.20 0.012 280 / 0.04);
  --press-overlay: oklch(0.20 0.012 280 / 0.08);

  --disabled-opacity: 0.42;
  --disabled-saturate: 0.6;

  /* Control heights — single source of truth */
  --control-h-sm: 28px;
  --control-h-md: 36px;
  --control-h-lg: 44px;

  /* Inset highlight + outline combo used on light glass surfaces */
  --ring-inset-hi: inset 0 1px 0 var(--glass-stroke);
  --ring-outline: 0 0 0 1px var(--glass-stroke-2);
}

/* Dark themes get a brighter focus ring so it stays visible on inky bgs. */
[data-theme="dark-glass"],
[data-theme="dark-yellow"],
[data-theme="midnight"],
[data-theme="obsidian"] {
  --focus-ring-color: oklch(0.85 0.10 295 / 0.55);
  --hover-overlay: rgba(255,255,255,0.05);
  --press-overlay: rgba(255,255,255,0.10);
}

/* ── Global focus-visible — never on mouse, always on keyboard ─────────── */
:where(button, [role="button"], a, input, select, textarea, summary, [tabindex]):focus { outline: none; }
:where(button, [role="button"], a, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-color: var(--violet);
  transition: box-shadow var(--motion-fast) var(--ease-standard);
}

/* ── Buttons — states + size variants ──────────────────────────────────── */
.kal-btn {
  /* Lock baseline rhythm */
  min-height: var(--control-h-md);
  font-variant-numeric: tabular-nums;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.kal-btn:focus-visible {
  box-shadow: var(--focus-ring), var(--shadow-sm);
}
.kal-btn--primary:focus-visible {
  box-shadow: var(--focus-ring), var(--shadow-md), inset 0 1px 0 rgba(255,255,255,.35);
}
.kal-btn[disabled],
.kal-btn[aria-disabled="true"],
.kal-btn--disabled {
  opacity: var(--disabled-opacity);
  filter: saturate(var(--disabled-saturate));
  pointer-events: none;
  cursor: not-allowed;
  box-shadow: none;
}
.kal-btn--sm {
  min-height: var(--control-h-sm);
  padding: 4px 12px;
  font-size: var(--fs-sm);
  gap: 6px;
}
.kal-btn--lg {
  min-height: var(--control-h-lg);
  padding: 12px 22px;
  font-size: var(--fs-md);
}
.kal-btn--icon {
  min-height: var(--control-h-md);
  width: var(--control-h-md);
  padding: 0;
}
.kal-btn--icon.kal-btn--sm { min-height: var(--control-h-sm); width: var(--control-h-sm); }
.kal-btn--icon.kal-btn--lg { min-height: var(--control-h-lg); width: var(--control-h-lg); }

/* Loading state — keeps width, swaps content with spinner glyph */
.kal-btn[data-loading="true"] {
  pointer-events: none;
  color: transparent !important;
}
.kal-btn[data-loading="true"]::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  color: var(--ink);
  animation: kal-spin 700ms linear infinite;
}
.kal-btn--primary[data-loading="true"]::after,
.kal-btn--dark[data-loading="true"]::after { color: #fff; }
.kal-btn { position: relative; }

/* ── Inputs / textareas / selects — states ─────────────────────────────── */
.kal-input {
  min-height: var(--control-h-md);
  line-height: 1.4;
}
.kal-input::placeholder { color: var(--ink-3); opacity: 1; }
.kal-input:hover:not(:focus):not([disabled]) {
  border-color: var(--line-strong);
}
.kal-input:focus,
.kal-input:focus-visible {
  outline: none;
  border-color: var(--violet);
  box-shadow: var(--focus-ring);
}
.kal-input[disabled],
.kal-input[aria-disabled="true"] {
  opacity: var(--disabled-opacity);
  background: oklch(0.95 0.005 280 / 0.6);
  cursor: not-allowed;
}
.kal-input[aria-invalid="true"],
.kal-input.is-invalid {
  border-color: var(--bad);
  box-shadow: 0 0 0 3px oklch(0.62 0.18 30 / 0.18);
}
.kal-input[aria-invalid="true"]:focus,
.kal-input.is-invalid:focus {
  box-shadow: 0 0 0 3px oklch(0.62 0.18 30 / 0.32);
}

/* Helper + error text — paired with .kal-input */
.kal-help, .kal-error {
  font-size: var(--fs-sm);
  margin-top: 6px;
  line-height: 1.4;
  font-family: var(--font-sans);
}
.kal-help  { color: var(--ink-3); }
.kal-error { color: var(--bad); display: flex; align-items: center; gap: 6px; }
.kal-error::before {
  content: ""; width: 4px; height: 4px; border-radius: 50%;
  background: var(--bad); flex-shrink: 0;
}

/* Label rhythm — slightly tighter, optical alignment with input */
.kal-label { margin-bottom: 7px; }
.kal-label[data-required]::after {
  content: " *"; color: var(--bad); font-weight: 600;
}

/* ── Toggle — focus ring + smoother knob ───────────────────────────────── */
.kal-toggle {
  outline: none;
}
.kal-toggle:focus-visible {
  box-shadow: var(--focus-ring);
}
.kal-toggle::after {
  transition: transform var(--motion-base) var(--ease-standard),
              box-shadow var(--motion-fast);
}
.kal-toggle--on { background: var(--violet); }

/* ── Tags — baseline rhythm ────────────────────────────────────────────── */
.kal-tag {
  min-height: 20px;
  padding: 3px 9px;
  align-self: center;
  white-space: nowrap;
}
.kal-tag:focus-visible {
  box-shadow: var(--focus-ring-tight);
  outline: none;
}

/* ── Cards — interactive variant gets the right affordances ────────────── */
.kal-card { transition: box-shadow var(--motion-fast) var(--ease-standard),
                        transform var(--motion-fast) var(--ease-standard),
                        border-color var(--motion-fast) var(--ease-standard); }
.kal-card--interactive { cursor: pointer; }
.kal-card--interactive:hover {
  transform: translateY(-1px);
  box-shadow: inset 0 1px 0 var(--glass-stroke), var(--shadow-md);
  border-color: var(--glass-stroke);
}
.kal-card--interactive:focus-within {
  box-shadow: inset 0 1px 0 var(--glass-stroke), var(--shadow-md), var(--focus-ring);
  border-color: var(--violet);
  outline: none;
}
.kal-card--interactive:active { transform: translateY(0); }

/* ── KPI tile — number + delta optical balance ─────────────────────────── */
.kal-kpi { transition: box-shadow var(--motion-fast); }
.kal-kpi:hover { box-shadow: var(--shadow-md); }
.kal-kpi__value { line-height: 1; padding-block: 2px; }
.kal-kpi__delta { font-variant-numeric: tabular-nums; }

/* ── Table — sticky header, zebra hover ────────────────────────────────── */
.kal-table th {
  position: sticky;
  top: 0;
  background: linear-gradient(var(--bg-1), var(--bg-1));
  z-index: 1;
}
.kal-table tbody tr { transition: background var(--motion-fast); }
.kal-table tbody tr:hover td { background: var(--hover-overlay); }
.kal-table td.kal-num,
.kal-table th.kal-num { text-align: right; font-variant-numeric: tabular-nums; }

/* ── Themebar — refined active state + scroll fade on mobile ───────────── */
.ds-themebar {
  box-shadow: var(--shadow-md), inset 0 1px 0 var(--glass-stroke);
}
.ds-themechip {
  transition: background var(--motion-fast) var(--ease-standard),
              color var(--motion-fast) var(--ease-standard),
              border-color var(--motion-fast) var(--ease-standard),
              transform var(--motion-instant);
}
.ds-themechip:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}
.ds-themechip--active {
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08), 0 1px 2px rgba(0,0,0,0.18);
}
.ds-themechip--active .ds-themechip__swatch {
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.45),
              0 0 0 2px rgba(255,255,255,0.15);
}

/* Mobile scroll edge fades — soft mask so chips don't get clipped abruptly */
@media (max-width: 900px) {
  .ds-themes-group {
    -webkit-mask-image: linear-gradient(to right, transparent 0, #000 16px, #000 calc(100% - 16px), transparent 100%);
            mask-image: linear-gradient(to right, transparent 0, #000 16px, #000 calc(100% - 16px), transparent 100%);
  }
}

/* ── Hero — tighter type rhythm at the new scale ───────────────────────── */
.ds-hero h1 { text-wrap: balance; }
.ds-hero p  { text-wrap: pretty; }

/* ── Section header rhythm ─────────────────────────────────────────────── */
.ds-section h2 { text-wrap: balance; }
.ds-section + .ds-section { border-top: 1px solid transparent; }

/* ── Demo card / surface — predictable interaction ─────────────────────── */
.ds-demo-card { transition: box-shadow var(--motion-fast), transform var(--motion-fast); }
.ds-demo-card:hover { box-shadow: var(--shadow-md); }

/* ── Scrollbar — make it match the violet palette across themes ────────── */
::-webkit-scrollbar-thumb {
  background: oklch(0.62 0.12 280 / 0.25);
}
::-webkit-scrollbar-thumb:hover { background: oklch(0.55 0.16 280 / 0.40); }

/* ── Spinner — slightly tighter ring ───────────────────────────────────── */
.kal-spinner::before { border-width: 2px; }

/* ── Empty state — better hierarchy ────────────────────────────────────── */
.kal-empty { padding: var(--space-12) var(--space-8); }
.kal-empty__title { letter-spacing: -0.01em; }

/* ── Toast — entry from below uses tokenized motion ────────────────────── */
.kal-toast { transition: transform var(--motion-base) var(--ease-decelerate),
                          opacity var(--motion-fast); }

/* ── Selection — uses brand color ──────────────────────────────────────── */
::selection {
  background: oklch(0.78 0.13 295 / 0.36);
  color: var(--ink);
}

/* ── Reduced motion — collapse all polish transitions ──────────────────── */
@media (prefers-reduced-motion: reduce) {
  .kal-card,
  .kal-card--interactive:hover,
  .kal-kpi,
  .ds-demo-card,
  .ds-themechip,
  .kal-table tbody tr,
  .kal-toggle::after {
    transition: none !important;
  }
  .kal-card--interactive:hover,
  .ds-demo-card:hover { transform: none; }
}

/* ── Print — drop expensive effects ────────────────────────────────────── */
@media print {
  .ds-themebar { display: none; }
  .kal-glass, .kal-glass-strong, .kal-card, .ds-demo-card {
    background: #fff !important;
    box-shadow: none !important;
    border-color: #ddd !important;
    backdrop-filter: none !important;
  }
}