/* Shared component primitives for PHANTOM TIDE.
   Ownership:
   - tokens.css: tokens only
   - shell.css: major layout only
   - this file: shared controls, header groups, footer controls
   - components.panels.css: banners, rail rows, panel surfaces */

/* Accessibility helpers */
:root { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
}

[hidden] {
  display: none !important;
}

.field-label-optional {
  font-weight: 400;
  opacity: 0.6;
}

.hdr-link,
.hdr-btn,
.panel-mobile-close,
.briefing-action-btn,
.briefing-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: var(--control-height-md);
  padding: 0 var(--space-3);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  background: var(--bg-surface-utility);
  color: var(--text-secondary);
  font: 600 var(--font-body)/1 var(--font-sans);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    border-color 120ms ease,
    background 120ms ease,
    color 120ms ease,
    box-shadow 120ms ease;
  appearance: none;
  -webkit-tap-highlight-color: rgba(37, 99, 235, 0.08);
}

.hdr-link:hover,
.hdr-link:focus-visible,
.hdr-btn:hover,
.hdr-btn:focus-visible,
.panel-mobile-close:hover,
.panel-mobile-close:focus-visible,
.briefing-action-btn:hover,
.briefing-action-btn:focus-visible,
.briefing-chip:hover,
.briefing-chip:focus-visible,
.hdr-btn[aria-expanded="true"],
.hdr-btn.is-active {
  border-color: rgba(37, 99, 235, 0.22);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text-primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.10);
}

.hdr-btn-accent,
.hdr-btn-accent:hover,
.hdr-btn-accent:focus-visible,
.hdr-btn-accent[aria-expanded="true"],
.hdr-btn-accent.is-active {
  background: rgba(37, 99, 235, 0.10);
  border-color: rgba(37, 99, 235, 0.18);
  color: var(--accent-cyan);
  box-shadow: none;
}

.hdr-btn-utility {
  background: rgba(248, 250, 252, 0.74);
  border-color: rgba(148, 163, 184, 0.22);
  color: var(--text-tertiary);
  box-shadow: none;
}

.hdr-btn-utility:hover,
.hdr-btn-utility:focus-visible,
.hdr-btn-utility[aria-expanded="true"],
.hdr-btn-utility.is-active {
  background: rgba(255, 255, 255, 0.88);
  border-color: rgba(148, 163, 184, 0.32);
  color: var(--text-secondary);
}

header.app-header {
  backdrop-filter: blur(10px);
}

.brand {
  font-size: var(--font-brand);
}

.hdr-platform,
.hdr-session,
.hdr-controls {
  position: relative;
}

.hdr-platform::before,
.hdr-session::before,
.hdr-controls::before {
  content: "";
  position: absolute;
  inset: var(--space-1) 0;
  pointer-events: none;
  border-left: 1px solid rgba(148, 163, 184, 0.12);
}

.hdr-platform {
  background:
    linear-gradient(180deg, rgba(248, 250, 252, 0.84), rgba(255, 255, 255, 0));
}

.hdr-session {
  gap: var(--space-1);
  color: var(--text-tertiary);
}

.hdr-session .hdr-meta-v {
  color: var(--text-secondary);
}

.hdr-controls {
  gap: var(--space-2);
}

.hdr-controls-operational,
.hdr-controls-utility {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.hdr-controls-operational {
  padding-right: var(--space-2);
  border-right: 1px solid rgba(148, 163, 184, 0.18);
}

.hdr-controls-utility {
  gap: var(--space-1);
  padding-left: var(--space-1);
}

.hdr-controls-operational .segmented {
  border-color: rgba(148, 163, 184, 0.32);
  background: rgba(255, 255, 255, 0.92);
}

.hdr-controls-operational .hdr-tw-btn,
.hdr-controls-operational .hdr-history-btn {
  font-size: var(--font-label);
}

.hdr-control-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.hdr-control-label {
  color: var(--text-dim);
  font: 600 9px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.hdr-utc-label {
  min-height: var(--control-height-sm);
  padding-inline: var(--space-2);
}

.hdr-overflow-menu {
  background: rgba(255, 255, 255, 0.98);
  border-color: rgba(148, 163, 184, 0.24);
}

.hdr-overflow-item {
  font-size: var(--font-body);
}

.app-footer {
  color: var(--text-tertiary);
}

.app-footer-note,
.app-footer-credit {
  font-size: var(--font-meta);
}

.app-footer-sep {
  font-size: var(--font-meta);
}

.app-footer-links {
  display: inline-flex;
  align-items: center;
  gap: var(--footer-gap);
}

.app-footer-links > a,
.app-footer-more > summary {
  display: inline-flex;
  align-items: center;
  min-height: var(--footer-link-height);
  padding: 0 6px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-tertiary);
  font: 600 var(--font-meta)/1 var(--font-sans);
  text-decoration: none;
  cursor: pointer;
  list-style: none;
}

.app-footer-more > summary::-webkit-details-marker {
  display: none;
}

.app-footer-links > a:hover,
.app-footer-links > a:focus-visible,
.app-footer-more > summary:hover,
.app-footer-more > summary:focus-visible,
.app-footer-more[open] > summary {
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.7);
}

.app-footer-more {
  position: relative;
}

.app-footer-more-menu {
  position: absolute;
  z-index: 20;
  right: 0;
  bottom: calc(100% + var(--space-2));
  display: grid;
  gap: var(--space-1);
  min-width: 220px;
  padding: var(--space-2);
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

.app-footer-more-menu a {
  color: var(--text-secondary);
  font: 500 var(--font-meta)/1.3 var(--font-sans);
  text-decoration: none;
}

.app-footer-more-menu a:hover,
.app-footer-more-menu a:focus-visible {
  color: var(--text-primary);
}

@media (min-width: 720px) {
  .mobile-only {
    display: none !important;
  }
}

@media (max-width: 720px) {
  .app-footer {
    grid-template-columns: 1fr;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .app-footer-links {
    width: 100%;
    justify-content: space-between;
  }
}