/* =========================================================
   Layout: app shell, navigation, page grids
   ========================================================= */

/* ---------- Navigation progress (page transitions) ---------- */
.nav-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: var(--z-progress);
  background: var(--gradient-ai); transform-origin: 0 50%; transform: scaleX(0); opacity: 0;
  pointer-events: none;
}
.nav-progress.is-active { opacity: 1; animation: progress-crawl 2.4s var(--ease-out) forwards; }

/* ---------- App shell: full-width top bar + left guide ---------- */
.app { display: grid; grid-template-columns: var(--sidebar-width) minmax(0, 1fr); min-height: calc(100vh - var(--topbar-height)); }
.guide-mini .app { grid-template-columns: var(--rail-width) minmax(0, 1fr); }
.app-main { min-width: 0; display: flex; flex-direction: column; }

/* ---------- Brand ---------- */
.brand { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-display); font-weight: 800; font-size: 1.2rem; letter-spacing: -.03em; color: var(--color-text); }
.brand:hover { color: var(--color-text); }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
.brand-word b { font-weight: 800; color: var(--color-primary); }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: var(--z-nav);
  height: var(--topbar-height);
  display: flex; align-items: center; gap: var(--space-4);
  padding: 0 var(--space-4);
  background: var(--color-surface-glass);
}
.topbar.is-scrolled { box-shadow: 0 1px 0 var(--color-border); }
.tb-start { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; width: calc(var(--sidebar-width) - var(--space-8)); }
.tb-start .brand { padding: 0 4px; }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }
.topbar .mobile-only { display: none; }
.topbar .icon-btn { color: var(--color-text); border-radius: 50%; }
.topbar .create-btn { height: 36px; padding: 0 16px 0 10px; border-radius: 18px; gap: 6px; --btn-bg: var(--color-chip); --btn-fg: var(--color-text); box-shadow: none; font-size: var(--text-sm); }
.topbar .create-btn:hover { --btn-bg: var(--color-chip-hover); box-shadow: none; }
.topbar .avatar-btn { margin-left: 4px; }
.topbar .avatar-btn .avatar { width: 32px; height: 32px; }

/* Global search — aligned input/button; no negative-margin positioning. */
.global-search { position: relative; flex: 1; min-width: 0; display: grid; grid-template-columns: minmax(0, 1fr) 56px 56px; align-items: center; gap: 0; max-width: 720px; margin: 0 auto; }
.global-search .search-field { min-width: 0; height: 44px; margin: 0; border-radius: 22px 0 0 22px; border-right: 0; padding: 0 16px; background: var(--color-surface); }
.global-search .search-field:focus-within { box-shadow: inset 0 0 0 1px var(--color-primary); }
.search-submit { flex-shrink: 0; height: 44px; width: 56px; margin: 0; padding: 0; display: grid; place-items: center; border: 1px solid var(--color-border); border-radius: 0 22px 22px 0; background: var(--color-chip); color: var(--color-text); transition: background var(--transition-fast); }
.search-submit:hover { background: var(--color-chip-hover); }
.search-photo { justify-self: end; flex-shrink: 0; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; background: var(--color-chip); color: var(--color-text); transition: background var(--transition-fast); }
.search-photo:hover { background: var(--color-chip-hover); color: var(--color-text); }
.search-field {
  display: flex; align-items: center; gap: 10px; min-width: 0; height: 44px; margin: 0; padding: 0 14px;
  border: 1px solid var(--color-border); border-radius: var(--border-radius-full);
  background: var(--color-surface); color: var(--color-text-subtle);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.search-field:hover { border-color: var(--color-border-strong); }
.search-field:focus-within { border-color: var(--color-primary); box-shadow: var(--shadow-focus); color: var(--color-primary); }
.search-field input { flex: 1; min-width: 0; height: 100%; border: 0; background: transparent; outline: 0; color: var(--color-text); padding: 0; font-size: 1rem; }
.search-field input::placeholder { color: var(--color-text-subtle); }
.search-field input::-webkit-search-cancel-button { -webkit-appearance: none; }
.kbd { display: inline-grid; place-items: center; min-width: 22px; height: 22px; padding: 0 6px; border-radius: 6px; border: 1px solid var(--color-border); background: var(--color-surface-hover); font-size: 11px; font-weight: 600; color: var(--color-text-subtle); }

/* ---------- Left guide ---------- */
.app-sidebar {
  position: sticky; top: var(--topbar-height); height: calc(100vh - var(--topbar-height)); z-index: var(--z-sticky);
  display: flex; flex-direction: column;
  padding: var(--space-3) var(--space-3) var(--space-4);
  background: var(--color-background);
  overflow-y: auto; scrollbar-width: thin; scrollbar-color: transparent transparent;
}
.app-sidebar:hover { scrollbar-color: var(--color-border-strong) transparent; }
.guide-head { display: none; }
.nav-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.nav-list .rail-only { display: none; }
.nav-sep { height: 1px; background: var(--color-border); margin: var(--space-3) 0; }
.nav-label { display: flex; align-items: center; gap: 4px; padding: 6px 12px 4px; font-family: var(--font-display); font-size: var(--text-md); font-weight: 700; color: var(--color-text); }
a.nav-label:hover { color: var(--color-text); }
.nav-item {
  position: relative; display: flex; align-items: center; gap: 22px;
  height: 40px; padding: 0 12px; border-radius: var(--border-radius-md);
  color: var(--color-text); font-weight: 500; font-size: var(--text-sm);
  transition: background var(--transition-fast);
}
.nav-item:hover { background: var(--color-surface-hover); color: var(--color-text); }
.nav-item[aria-current="page"] { background: var(--color-surface-hover); font-weight: 650; }
.nav-item[aria-current="page"]:hover { background: var(--color-chip-hover); }
.nav-item[aria-current="page"] .icon { color: var(--color-primary); }
.nav-item .nav-text { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-count {
  min-width: 20px; height: 20px; padding: 0 6px; border-radius: var(--border-radius-full);
  display: inline-grid; place-items: center; font-size: 11px; font-weight: 700;
  background: var(--color-primary); color: var(--color-on-primary);
}
.nav-ai .icon { color: var(--color-primary); }
.sidebar-foot { margin-top: auto; padding: var(--space-6) 12px 0; font-size: 12px; line-height: 1.6; color: var(--color-text-subtle); }

/* Mini rail (YouTube-style icon + tiny label) */
.guide-mini .app-sidebar { padding: var(--space-1) var(--space-1); }
.guide-mini .nav-label, .guide-mini .nav-sep, .guide-mini .sidebar-foot, .guide-mini .nav-list:not(:first-child) { display: none; }
.guide-mini .nav-list .rail-only { display: block; }
.guide-mini .nav-item { flex-direction: column; justify-content: center; gap: 6px; height: 74px; padding: 14px 0 12px; font-size: 10px; font-weight: 500; }
.guide-mini .nav-item .nav-text { flex: 0; max-width: 100%; text-align: center; }
.guide-mini .nav-item[aria-current="page"] { background: none; font-weight: 600; }
.guide-mini .nav-item:hover { background: var(--color-surface-hover); }

.guide-backdrop { display: none; }

/* ---------- Page container ---------- */
.page {
  flex: 1; width: 100%; max-width: calc(var(--content-max) + 2 * var(--space-8));
  margin: 0 auto; padding: var(--space-6) var(--space-6) var(--space-16);
}
.page:focus { outline: none; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; margin-bottom: var(--space-6); }
.page-head h1 { margin: 0; display: flex; align-items: center; gap: 12px; }
.page-head h1 .icon { color: var(--color-primary); }
.page-head p { margin: 6px 0 0; }

/* Two-column page: content + contextual panel */
.layout { display: grid; grid-template-columns: minmax(0, 1fr) var(--panel-width); gap: var(--space-8); align-items: start; }
.layout.narrow { grid-template-columns: minmax(0, 720px); justify-content: center; }
.layout.feed-layout { grid-template-columns: minmax(0, var(--feed-max)) var(--panel-width); justify-content: center; gap: var(--space-10); }
.sidebar { position: sticky; top: calc(var(--topbar-height) + var(--space-4)); display: grid; gap: var(--space-4); }
.sidebar > .card + .card { margin-top: 0; }

.site-footer { padding: var(--space-6) var(--space-8) var(--space-8); text-align: center; color: var(--color-text-subtle); font-size: var(--text-xs); }

/* ---------- Mobile bottom navigation ---------- */
.bottom-nav { display: none; }

/* ---------- Public (logged-out) header ---------- */
.public-header {
  position: sticky; top: 0; z-index: var(--z-sticky);
  display: flex; align-items: center; gap: var(--space-3);
  height: 68px; padding: 0 max(var(--space-6), calc((100vw - 1200px) / 2));
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: saturate(160%) blur(14px); backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.public-header .actions { margin-left: auto; display: flex; align-items: center; gap: var(--space-2); }
.page.public { max-width: 1264px; }

/* ---------- Admin shell ---------- */
.admin-shell { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: var(--space-6); align-items: start; }
.admin-nav { position: sticky; top: calc(var(--topbar-height) + var(--space-4)); padding: var(--space-2); display: grid; gap: 2px; }
.admin-nav a { display: flex; align-items: center; gap: 10px; height: 40px; padding: 0 12px; border-radius: var(--border-radius-sm); color: var(--color-text-muted); font-weight: 550; font-size: var(--text-sm); transition: background var(--transition-fast), color var(--transition-fast); }
.admin-nav a:hover { background: var(--color-surface-hover); color: var(--color-text); }
.admin-nav a.active { background: var(--color-primary-soft); color: var(--color-primary); }
.admin-nav .badge { margin-left: auto; }