/* Forge3D app shell: rail / bottom tab bar, top bar, view container, Sheet, toasts, state blocks.
 * Mobile-first. Desktop rail = 72 px (220 px at >= 1280 px); <= 768 px rail becomes a bottom tab bar. */

.mz-app { display: flex; flex-direction: column; min-height: 100vh; min-height: 100dvh; background: var(--mz-color-bg-app); overflow-x: clip; }
.mz-col { display: flex; flex-direction: column; min-width: 0; flex: 1 1 auto; }

/* Top bar (phone: fixed, desktop: sticky in the content column) */
.mz-topbar {
  position: fixed; inset: 0 0 auto 0; z-index: var(--mz-z-topbar);
  display: flex; align-items: center; gap: var(--mz-space-2);
  min-height: calc(var(--mz-size-topbar) + env(safe-area-inset-top));
  padding: env(safe-area-inset-top) calc(var(--mz-space-3) + env(safe-area-inset-right)) 0 calc(var(--mz-space-3) + env(safe-area-inset-left));
  background: var(--mz-surface-glass);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--mz-border-subtle);
}
.mz-wordmark {
  display: inline-flex; align-items: center; gap: var(--mz-space-2); min-height: var(--mz-size-tap);
  font-weight: var(--mz-font-weight-semibold); font-size: var(--mz-font-size-lg); letter-spacing: -0.01em;
  text-decoration: none; color: var(--mz-color-text-primary); white-space: nowrap; padding-right: var(--mz-space-2);
}
.mz-wordmark__glyph { width: 28px; height: 28px; border-radius: var(--mz-radius-control); display: grid; place-items: center; background: var(--mz-color-accent-primary); color: var(--mz-text-on-accent); }
.mz-topbar__title { flex: 1 1 auto; min-width: 0; font-size: var(--mz-font-size-md); color: var(--mz-text-secondary); font-weight: var(--mz-font-weight-medium); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mz-topbar__actions { display: flex; align-items: center; gap: var(--mz-space-1); }
.mz-user-btn { display: inline-flex; align-items: center; gap: var(--mz-space-2); max-width: 46vw; }
.mz-user-btn .mz-truncate { max-width: 28vw; }

/* Main column */
.mz-main {
  flex: 1 1 auto; min-width: 0; overflow-x: clip; position: relative;
  padding-top: calc(var(--mz-size-topbar) + env(safe-area-inset-top));
  padding-bottom: calc(var(--mz-size-tabbar) + env(safe-area-inset-bottom) + var(--mz-space-4));
}
.mz-main:focus { outline: none; }
.mz-view { min-width: 0; }
.mz-view img, .mz-view video { max-width: 100%; height: auto; }
.mz-view table { display: block; overflow-x: auto; max-width: 100%; }
.mz-page { width: 100%; max-width: 1200px; margin: 0 auto; padding: var(--mz-space-4) calc(var(--mz-space-4) + env(safe-area-inset-right)) var(--mz-space-6) calc(var(--mz-space-4) + env(safe-area-inset-left)); min-width: 0; }
.mz-page__head { display: flex; align-items: flex-end; gap: var(--mz-space-3); flex-wrap: wrap; margin-bottom: var(--mz-space-4); }
.mz-page__head > div:first-child { flex: 1 1 220px; min-width: 0; }

/* Primary nav: bottom tab bar on phones (base), rail on desktop */
.mz-rail {
  position: fixed; inset: auto 0 0 0; z-index: var(--mz-z-rail);
  display: flex; flex-direction: row;
  padding: var(--mz-space-1) calc(var(--mz-space-2) + env(safe-area-inset-right)) calc(var(--mz-space-1) + env(safe-area-inset-bottom)) calc(var(--mz-space-2) + env(safe-area-inset-left));
  background: var(--mz-surface-glass);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-top: 1px solid var(--mz-border-subtle);
}
.mz-rail__brand { display: none; }
.mz-rail__list { display: flex; flex: 1 1 auto; gap: var(--mz-space-1); justify-content: space-around; margin: 0; padding: 0; list-style: none; min-width: 0; }
.mz-rail__list > li { flex: 1 1 0; min-width: 0; display: flex; }
.mz-rail__item {
  position: relative; flex: 1 1 auto;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  min-width: var(--mz-size-tap); min-height: 52px; padding: var(--mz-space-1);
  border-radius: var(--mz-radius-control); color: var(--mz-text-muted);
  text-decoration: none; font-size: var(--mz-font-size-xs); font-weight: var(--mz-font-weight-medium);
  transition: background-color var(--mz-motion-fast) var(--mz-ease-out);
}
.mz-rail__item[aria-current="page"] { color: var(--mz-color-text-primary); background: var(--mz-color-cta-soft); }
.mz-rail__item[aria-current="page"] .mz-icon { color: var(--mz-color-accent-cta); }
.mz-rail__label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.mz-rail__lock { position: absolute; top: 4px; right: calc(50% - 20px); width: 14px; height: 14px; color: var(--mz-text-muted); }
@media (hover: hover) { .mz-rail__item:hover { background: var(--mz-surface-hover); color: var(--mz-color-text-primary); } }

@media (max-width: 768px) {
  .mz-rail { flex-direction: row; }
  .mz-topbar { position: fixed; }
  .mz-hide-tabbar .mz-rail { display: flex; }
}

@media (min-width: 769px) {
  .mz-app { display: grid; grid-template-columns: var(--mz-size-rail) minmax(0, 1fr); }
  .mz-rail {
    position: sticky; top: 0; inset: auto; height: 100vh; height: 100dvh;
    flex-direction: column; gap: var(--mz-space-2);
    padding: calc(var(--mz-space-3) + env(safe-area-inset-top)) var(--mz-space-2) var(--mz-space-3) calc(var(--mz-space-2) + env(safe-area-inset-left));
    border-top: 0; border-right: 1px solid var(--mz-border-subtle);
    background: var(--mz-color-surface-panel);
  }
  .mz-rail__brand { display: flex; justify-content: center; }
  .mz-rail__brand .mz-wordmark__text { display: none; }
  .mz-rail__list { flex-direction: column; justify-content: flex-start; flex: 0 0 auto; }
  .mz-rail__item { min-height: 60px; }
  .mz-topbar { position: sticky; top: 0; padding-left: var(--mz-space-4); padding-right: calc(var(--mz-space-4) + env(safe-area-inset-right)); }
  .mz-topbar > .mz-wordmark { display: none; }
  .mz-main { padding-top: 0; padding-bottom: var(--mz-space-6); }
}

@media (min-width: 1280px) {
  .mz-app { grid-template-columns: var(--mz-size-rail-wide) minmax(0, 1fr); }
  .mz-rail { padding-left: var(--mz-space-3); padding-right: var(--mz-space-3); }
  .mz-rail__brand { justify-content: flex-start; padding: 0 var(--mz-space-2); }
  .mz-rail__brand .mz-wordmark__text { display: inline; }
  .mz-rail__item { flex-direction: row; justify-content: flex-start; gap: var(--mz-space-3); padding: 0 var(--mz-space-3); min-height: var(--mz-size-tap); font-size: var(--mz-font-size-sm); }
  .mz-rail__lock { position: static; }
}

/* State blocks (loading / empty / error) */
.mz-state { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; gap: var(--mz-space-3); padding: var(--mz-space-10) var(--mz-space-4); color: var(--mz-text-secondary); min-height: 200px; }
.mz-state__icon { width: 48px; height: 48px; border-radius: var(--mz-radius-pill); display: grid; place-items: center; background: var(--mz-surface-elevated); color: var(--mz-color-accent-primary); }
.mz-state__msg { max-width: 42ch; }
.mz-state--error .mz-state__icon { color: var(--mz-color-danger); background: var(--mz-color-danger-soft); }
.mz-skeleton { display: grid; gap: var(--mz-space-3); width: 100%; padding: var(--mz-space-4) 0; }
.mz-skeleton__bar { height: 14px; border-radius: var(--mz-radius-pill); background: var(--mz-surface-elevated); animation: mz-pulse 1.4s ease-in-out infinite; }
.mz-skeleton__bar:nth-child(2) { width: 82%; }
.mz-skeleton__bar:nth-child(3) { width: 64%; }
.mz-skeleton__tile { aspect-ratio: 1 / 1; border-radius: var(--mz-radius-panel); background: var(--mz-surface-elevated); animation: mz-pulse 1.4s ease-in-out infinite; }

/* Sheet: bottom sheet on phones (base), docked side panel on desktop */
.mz-sheet-backdrop { position: fixed; inset: 0; z-index: var(--mz-z-sheet); background: var(--mz-surface-overlay); opacity: 0; transition: opacity var(--mz-motion-base) var(--mz-ease-out); }
.mz-sheet-backdrop.is-open { opacity: 1; }
.mz-sheet {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: calc(var(--mz-z-sheet) + 1);
  display: flex; flex-direction: column;
  max-height: calc(100dvh - env(safe-area-inset-top) - 8px);
  background: var(--mz-color-surface-panel);
  border-radius: var(--mz-radius-panel) var(--mz-radius-panel) 0 0;
  border: 1px solid var(--mz-border-subtle); border-bottom: 0;
  box-shadow: var(--mz-shadow-sheet);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left); padding-right: env(safe-area-inset-right);
  transform: translateY(100%);
  transition: transform var(--mz-motion-slow) var(--mz-ease-out);
}
.mz-sheet.is-open { transform: translateY(0); }
.mz-sheet--half { height: 50dvh; }
.mz-sheet--full { height: calc(100dvh - env(safe-area-inset-top) - 8px); }
.mz-sheet--auto { height: auto; }
.mz-sheet__grab { display: flex; justify-content: center; align-items: center; min-height: var(--mz-size-tap); cursor: grab; flex: 0 0 auto; }
.mz-sheet__handle { width: var(--mz-size-sheet-handle); height: 4px; border-radius: var(--mz-radius-pill); background: var(--mz-border-strong); }
.mz-sheet__head { display: flex; align-items: center; gap: var(--mz-space-2); padding: 0 var(--mz-space-2) var(--mz-space-2) var(--mz-space-4); flex: 0 0 auto; }
.mz-sheet__title { flex: 1 1 auto; min-width: 0; font-size: var(--mz-font-size-lg); font-weight: var(--mz-font-weight-semibold); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mz-sheet__body { flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 0 var(--mz-space-4) var(--mz-space-4); touch-action: pan-y; -webkit-overflow-scrolling: touch; }
.mz-sheet.is-dragging { transition: none; }

@media (max-width: 768px) {
  .mz-sheet { left: 0; right: 0; }
}
@media (min-width: 769px) {
  .mz-sheet-backdrop.is-docked { display: none; }
  .mz-sheet.is-docked {
    top: var(--mz-size-topbar); bottom: 0; right: 0; left: auto; width: var(--mz-size-panel); height: auto; max-height: none;
    border-radius: var(--mz-radius-panel) 0 0 var(--mz-radius-panel); border: 1px solid var(--mz-border-subtle); border-right: 0;
    transform: translateX(100%); box-shadow: var(--mz-shadow-panel); z-index: var(--mz-z-panel);
  }
  .mz-sheet.is-docked.mz-sheet--left { left: var(--mz-size-rail); right: auto; border-radius: 0 var(--mz-radius-panel) var(--mz-radius-panel) 0; transform: translateX(-120%); }
  .mz-sheet.is-docked.is-open { transform: translateX(0); }
  .mz-sheet.is-docked .mz-sheet__grab { display: none; }
  .mz-sheet.is-docked .mz-sheet__head { padding-top: var(--mz-space-3); }
}

/* Toasts */
.mz-toast-root { position: fixed; z-index: var(--mz-z-toast); left: 50%; transform: translateX(-50%); bottom: calc(var(--mz-size-tabbar) + env(safe-area-inset-bottom) + var(--mz-space-3)); display: flex; flex-direction: column; gap: var(--mz-space-2); width: min(92vw, 420px); pointer-events: none; }
.mz-toast { pointer-events: auto; display: flex; align-items: center; gap: var(--mz-space-3); padding: var(--mz-space-2) var(--mz-space-2) var(--mz-space-2) var(--mz-space-4); background: var(--mz-surface-elevated); border: 1px solid var(--mz-border-default); border-radius: var(--mz-radius-panel); box-shadow: var(--mz-shadow-panel); font-size: var(--mz-font-size-sm); }
.mz-toast__msg { flex: 1 1 auto; min-width: 0; overflow-wrap: anywhere; }
.mz-toast--error { border-color: var(--mz-color-danger); }
.mz-toast--ok { border-color: var(--mz-color-success); }
@media (min-width: 769px) { .mz-toast-root { bottom: var(--mz-space-6); } }

/* Tooltip shown on focus and long-press (never hover-only) */
.mz-tip { position: relative; }
.mz-tip[data-tip-open="true"]::after {
  content: attr(data-tip); position: absolute; left: 50%; bottom: calc(100% + 6px); transform: translateX(-50%);
  background: var(--mz-color-text-primary); color: var(--mz-text-on-accent); font-size: var(--mz-font-size-xs);
  padding: 4px 8px; border-radius: 6px; white-space: nowrap; pointer-events: none; z-index: var(--mz-z-toast);
}

/* Scroll-button pair for horizontal tab strips (shown on phones so the strip is never gesture-only) */
.mz-tabstrip { display: flex; align-items: center; gap: var(--mz-space-1); min-width: 0; max-width: 100%; }
.mz-tabstrip .mz-tabs { flex: 1 1 auto; min-width: 0; }
.mz-tabstrip__btn { display: none; flex: 0 0 auto; }
@media (max-width: 768px) { .mz-tabstrip.is-overflowing .mz-tabstrip__btn { display: inline-flex; } }

@media (prefers-reduced-motion: reduce) {
  .mz-sheet, .mz-sheet-backdrop, .mz-rail__item, .mz-skeleton__bar, .mz-skeleton__tile { transition: none; animation: none; }
}