/*
 * Kapable Platform — Shared Header
 * Uses --kp-* tokens from kapable-theme.css exclusively.
 * Height: 44px. Designed to work across all app surfaces.
 */

/* sticky per operator ask 2026-07-22: header must outrank main content in
   z-index — equal z buries popovers (dropdowns at z 200) under later-painted
   page content (IMP-2590 lane lesson).
 *
 * BOTH rules below must carry position:sticky — not just .kp-header. Two
 * mount shapes exist across consumers:
 *   1. Wrapper mount (kv2-launchpad, kv2-chat): a `<div id="kapable-header">`
 *      that kapable-header.js#mount() renders the real <header class="kp-
 *      header"> into. sticky on .kp-header alone does NOTHING here — a
 *      sticky element only moves within its containing block's bounds, and
 *      the wrapper div is exactly header-height (it has no extra scrollable
 *      room for the child to "stick" through), so the whole wrapper needs
 *      to be the sticky element.
 *   2. Direct render (kv2-board, designer-ui): <header class="kp-header">
 *      is itself a flex-shell child, with `main` doing the overflow
 *      scrolling. There the header already sits outside the scroller, so
 *      sticky on it is a harmless no-op — the #kapable-header rule below
 *      simply never matches.
 * Consumer note: any app that already declares its own `#kapable-header`
 * rule (kv2-launchpad's styles.css has `#kapable-header { position:
 * relative; z-index: 10 }`, written for the old non-sticky header) must
 * drop or realign that local rule — otherwise it wins by source order and
 * silently cancels this fix. That realignment is wave-1 consumer work, not
 * done here.
 */
#kapable-header,
.kp-header {
  position: sticky;
  top: 0;
  z-index: 100;
}
.kp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  height: 44px;
  background: var(--kp-surface);
  border-bottom: 1px solid var(--kp-border);
  font-family: var(--kp-font);
  flex-shrink: 0;
}

/* ── Left: brand + app name ── */
.kp-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.kp-header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--kp-text);
  font-weight: 700;
  font-size: 15px;
  white-space: nowrap;
  transition: color 0.15s;
}
.kp-header-brand:hover {
  text-decoration: none;
  color: var(--kp-accent);
}
.kp-header-brand img {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  flex-shrink: 0;
}
.kp-header-mark {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  display: block;
}
/* Wordmark sizing in the header context (register rules live in kapable-theme.css) */
.kp-header-brand .kp-wordmark {
  font-size: 14px;
}

.kp-header-sep {
  color: var(--kp-text-muted);
  font-weight: 300;
  font-size: 16px;
  user-select: none;
  opacity: 0.5;
}

.kp-header-app {
  display: inline-flex;
  align-items: center;
  min-width: 24px;
  min-height: 24px;
  color: var(--kp-text-dim);
  font-weight: 500;
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
a.kp-header-app:hover,
a.kp-header-app:focus-visible {
  color: var(--kp-accent);
  text-decoration: none;
}

/* ── Right: actions ── */
.kp-header-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── Icon button (theme toggle, chat toggle) ── */
.kp-header-icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: none;
  border: 1px solid transparent;
  color: var(--kp-text-dim);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  position: relative;
  padding: 0;
}
.kp-header-icon-btn:hover {
  background: var(--kp-surface-hi);
  border-color: var(--kp-border);
  color: var(--kp-text);
}
.kp-header-icon-btn svg {
  width: 16px;
  height: 16px;
}

/* Chat badge in header */
.kp-header-chat-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--kp-danger);
  display: none;
}
.kp-header-chat-badge.visible {
  display: block;
}

/* ── User button ── */
.kp-header-user-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px 4px 4px;
  border-radius: 6px;
  background: none;
  border: 1px solid transparent;
  color: var(--kp-text-dim);
  font-size: 13px;
  cursor: pointer;
  font-family: var(--kp-font);
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.kp-header-user-btn:hover {
  background: var(--kp-surface-hi);
  border-color: var(--kp-border);
}
.kp-header-user-btn.open {
  background: var(--kp-surface-hi);
  border-color: var(--kp-border);
}

.kp-header-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--kp-accent-bg);
  color: var(--kp-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 11px;
  flex-shrink: 0;
}

.kp-header-chevron {
  width: 12px;
  height: 12px;
  opacity: 0.5;
  transition: transform 0.15s;
}
.kp-header-user-btn.open .kp-header-chevron {
  transform: rotate(180deg);
}

/* ── Dropdown ── */
.kp-header-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  background: var(--kp-surface);
  border: 1px solid var(--kp-border);
  border-radius: var(--kp-radius, 8px);
  min-width: 200px;
  box-shadow: var(--kp-shadow-lg, 0 8px 24px rgba(15, 23, 42, 0.14));
  z-index: 200;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  /* visibility keeps the CLOSED menu out of the tab order (a11y): opacity
     alone leaves invisible items keyboard-focusable. The delayed visibility
     transition preserves the fade-out. */
  visibility: hidden;
  transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0s linear 0.15s;
}
.kp-header-dropdown.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  visibility: visible;
  transition-delay: 0s;
}

.kp-header-dd-section {
  padding: 10px 12px;
}
.kp-header-dd-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--kp-text);
}
.kp-header-dd-email {
  font-size: 12px;
  color: var(--kp-text-dim);
  margin-top: 2px;
}
.kp-header-dd-sep {
  height: 1px;
  background: var(--kp-border);
}

.kp-header-dd-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--kp-text);
  cursor: pointer;
  text-decoration: none;
  border: none;
  background: none;
  width: 100%;
  font-family: var(--kp-font);
  transition: background 0.1s;
}
.kp-header-dd-item:hover {
  background: var(--kp-surface-hi);
  text-decoration: none;
}
.kp-header-dd-item svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  color: var(--kp-text-dim);
}
.kp-header-dd-item.danger {
  color: var(--kp-danger);
}
.kp-header-dd-item.danger svg {
  color: var(--kp-danger);
}
.kp-header-dd-item.danger:hover {
  background: var(--kp-danger-bg);
}

/* ── Tool switcher ───────────────────────────────────────────────────────
   The shared shell's cross-tool index: a grid-glyph trigger beside the app
   link, opening a grouped, filterable panel. Ruled grammar; the panel is a
   dialog, so it earns a container. */
.kp-header-switcher-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: none;
  border: 1px solid transparent;
  color: var(--kp-text-dim);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  padding: 0;
  flex-shrink: 0;
}
.kp-header-switcher-btn:hover {
  background: var(--kp-surface-hi);
  border-color: var(--kp-border);
  color: var(--kp-text);
}
.kp-header-switcher-btn svg { width: 13px; height: 13px; }

.kp-switcher {
  position: absolute;
  left: 12px;
  top: calc(100% + 4px);
  width: min(560px, calc(100vw - 24px));
  background: var(--kp-surface);
  border: 1px solid var(--kp-border);
  border-radius: var(--kp-radius, 4px);
  box-shadow: var(--kp-shadow-lg, 0 8px 24px rgba(15, 23, 42, 0.14));
  z-index: 200;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  visibility: hidden;
  transition: opacity 0.15s ease-out, transform 0.15s ease-out, visibility 0s linear 0.15s;
}
.kp-switcher.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  visibility: visible;
  transition-delay: 0s;
}

.kp-switcher-find {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--kp-text);
  font-family: var(--kp-font-mono);
  font-size: 13px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--kp-border);
  outline: none;
}
.kp-switcher-find::placeholder { color: var(--kp-text-muted); }
.kp-switcher-find:focus-visible { border-bottom-color: var(--kp-accent); }

.kp-switcher-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 18px;
  padding: 8px 8px 10px;
  max-height: 340px;
  overflow-y: auto;
}
.kp-switcher-group h4 {
  margin: 0;
  padding: 10px 10px 4px;
  font-family: var(--kp-font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: lowercase;
  color: var(--kp-text-dim);
}
.kp-switcher-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 10px;
  border-radius: 3px;
  text-decoration: none;
  color: var(--kp-text);
}
.kp-switcher-item:hover { text-decoration: none; }
.kp-switcher-item.selected { background: var(--kp-accent-bg); }
.kp-switcher-idx {
  font-family: var(--kp-font-mono);
  font-size: 9.5px;
  font-variant-numeric: tabular-nums;
  color: var(--kp-text-dim);
  flex-shrink: 0;
}
.kp-switcher-name {
  font-family: var(--kp-font-display);
  font-optical-sizing: auto;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1.25;
}
.kp-switcher-item.selected .kp-switcher-name,
.kp-switcher-item.here .kp-switcher-name { color: var(--kp-accent); }
.kp-switcher-ext {
  margin-left: auto;
  font-size: 10px;
  color: var(--kp-text-dim);
}
.kp-switcher-empty {
  grid-column: 1 / -1;
  padding: 14px;
  text-align: center;
  font-size: 12px;
  color: var(--kp-text-muted);
}
.kp-switcher-foot {
  display: flex;
  gap: 14px;
  padding: 8px 16px;
  border-top: 1px solid var(--kp-border-subtle, var(--kp-border));
  font-family: var(--kp-font-mono);
  font-size: 10px;
  color: var(--kp-text-dim);
}
.kp-switcher-foot kbd {
  font-family: inherit;
  font-size: 9px;
  border: 1px solid var(--kp-border);
  border-radius: 3px;
  padding: 0 4px;
}

@media (max-width: 640px) {
  .kp-switcher { left: 8px; width: calc(100vw - 16px); }
  .kp-switcher-cols { grid-template-columns: 1fr 1fr; }
}

/* ── Mobile ── */
@media (max-width: 600px) {
  .kp-header { padding: 0 12px; }
  .kp-header-app { display: none; }
  .kp-header-sep { display: none; }
}