/* =============================================================================
   Interactive provider picker (IRO-311).

   A static, keyboard-accessible chooser on the model-provider decision page:
   pick a backend, get the exact `agent create` command, the host-side config
   snippet, and a one-line "verify isolation" step, each with a copy button.

   Design notes
   - Native radios inside a role="radiogroup": arrow-key navigation, focus ring,
     and label association come free (Recognition over Recall; Jakob's Law).
   - Progressive enhancement: without JS every panel is visible and its code is
     selectable, so the page still works. `provider-picker.js` adds the `.pp-js`
     class, which is the ONLY thing that hides non-selected panels — no JS, no
     hidden content.
   - Colors/spacing reuse the brand tokens from brand.css (steel scale).
   ========================================================================== */

.pp {
  --pp-gap: 0.75rem;
  margin: 1.25rem 0 2rem;
}

/* ---- Chip radiogroup ---------------------------------------------------- */

.pp-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

/* Category separators between chip clusters (Chunking / Common Region). */
.pp-cat {
  flex: 1 0 100%;
  margin: 0.6rem 0 0.1rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--md-default-fg-color--light);
}
.pp-cat:first-child { margin-top: 0; }

.pp-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  /* Fitts's Law: comfortable target, >=32px tall. */
  min-height: 2rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--md-default-fg-color--lighter);
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--md-default-fg-color);
  background: var(--md-default-bg-color);
  cursor: pointer;
  user-select: none;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}
.pp-chip:hover { border-color: var(--iro-steel-500); }

/* Native radio kept visible for a11y; sized to sit inside the chip. */
.pp-chip input[type="radio"] {
  width: 0.85rem;
  height: 0.85rem;
  margin: 0;
  accent-color: var(--iro-steel-600);
  flex: none;
}

/* Checked chip: filled steel, white text (Von Restorff — the active choice pops). */
.pp-chip:has(input:checked) {
  background: var(--iro-steel-600);
  border-color: var(--iro-steel-600);
  color: #ffffff;
}
[data-md-color-scheme="slate"] .pp-chip:has(input:checked) {
  background: var(--iro-steel-500);
  border-color: var(--iro-steel-500);
  color: #0b1124;
}

/* Keyboard focus ring on the chip that owns the focused radio. */
.pp-chip:has(input:focus-visible) {
  outline: 2px solid var(--iro-steel-500);
  outline-offset: 2px;
}

/* ---- Panels ------------------------------------------------------------- */

.pp-panels { margin-top: 1rem; }

.pp-panel {
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.5rem;
  padding: 1rem 1.1rem 1.2rem;
  background: var(--md-code-bg-color);
}

/* Enhanced mode: JS present -> show only the selected panel. */
.pp-js .pp-panel { display: none; }
.pp-js .pp-panel.pp-active { display: block; }

/* No-JS separator so stacked panels stay visually distinct. */
.pp-panel + .pp-panel { margin-top: 1rem; }
.pp-js .pp-panel + .pp-panel { margin-top: 0; }

.pp-panel > h4 {
  margin: 0 0 0.15rem;
  font-size: 1rem;
}
.pp-panel-sub {
  margin: 0 0 1rem;
  color: var(--md-default-fg-color--light);
  font-size: 0.85rem;
}

/* ---- Steps -------------------------------------------------------------- */

.pp-step { margin-top: 1.1rem; }
.pp-step:first-of-type { margin-top: 0; }

.pp-step-head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}
.pp-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  flex: none;
  border-radius: 999px;
  background: var(--iro-steel-600);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
}
.pp-step-title {
  font-weight: 700;
  font-size: 0.9rem;
}
.pp-step-note {
  margin: 0.3rem 0 0;
  font-size: 0.78rem;
  color: var(--md-default-fg-color--light);
}

/* ---- Code + copy button ------------------------------------------------- */

.pp-code {
  position: relative;
}
.pp-code pre {
  margin: 0;
  padding: 0.75rem 3.2rem 0.75rem 0.9rem; /* right room reserves space for the copy button */
  border-radius: 0.35rem;
  background: var(--md-default-bg-color);
  border: 1px solid var(--md-default-fg-color--lightest);
  font-size: 0.8rem;
  line-height: 1.5;
}
.pp-code pre code {
  font-family: var(--md-code-font-family, monospace);
  /* Wrap long commands instead of scrolling: no horizontal scroll on mobile, and
     the text never runs under the top-right copy button. The Copy button always
     copies the exact single-line source regardless of visual wrapping. */
  white-space: pre-wrap;
  word-break: break-word;
  background: none;
  padding: 0;
}
.pp-comment { color: var(--md-default-fg-color--light); }

/* Copy button — hidden until JS reveals it (nothing to click without a handler). */
.pp-copy {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  display: none;
  align-items: center;
  gap: 0.3rem;
  padding: 0.28rem 0.55rem;
  border: 1px solid var(--md-default-fg-color--lighter);
  border-radius: 0.3rem;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease;
}
.pp-js .pp-copy { display: inline-flex; }
.pp-copy:hover { border-color: var(--iro-steel-500); }
.pp-copy:focus-visible {
  outline: 2px solid var(--iro-steel-500);
  outline-offset: 2px;
}
.pp-copy .pp-copy-done { display: none; }
.pp-copy.pp-copied { border-color: var(--iro-steel-600); color: var(--iro-steel-700); }
[data-md-color-scheme="slate"] .pp-copy.pp-copied { color: var(--iro-steel-300); }
.pp-copy.pp-copied .pp-copy-idle { display: none; }
.pp-copy.pp-copied .pp-copy-done { display: inline; }

/* Screen-reader-only live region for copy confirmations. */
.pp-live {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- Reduced motion ----------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .pp-chip,
  .pp-copy {
    transition: none;
  }
}