/* ============================================================
   Meridian — app shell: rail, topbar, omni, popovers, modals,
   toasts, settings, notifications
   ============================================================ */

.app {
  display: grid; grid-template-columns: var(--rail-w) 1fr;
  grid-template-rows: minmax(0, 1fr);
  height: 100dvh; width: 100vw; overflow: hidden;
}

.stage { display: flex; flex-direction: column; min-width: 0; height: 100%; }

/* ============================= Rail ============================= */
.rail {
  display: flex; flex-direction: column; align-items: center;
  padding: 12px 0 14px; gap: 6px;
  background: var(--surface-0); border-right: 1px solid var(--line);
  z-index: 40;
}
.rail-logo {
  width: 44px; height: 44px; border-radius: 13px; margin-bottom: 8px; position: relative;
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 60%, #9b5cff) 100%);
  box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 45%, transparent), inset 0 1px 0 rgba(255,255,255,.28);
  transition: transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease), border-radius var(--t-med) var(--ease);
}
.rail-logo:hover { transform: translateY(-1px) rotate(-3deg); border-radius: 50%; }
.rail-logo svg { position: absolute; inset: 0; margin: auto; width: 24px; height: 24px; }

.rail-apps { display: flex; flex-direction: column; gap: 4px; width: 100%; padding: 0 8px; }
.rail-app {
  position: relative; width: 100%; height: 56px; border-radius: var(--r-md);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  color: var(--ink-3); transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.rail-app .rail-icon { display: flex; }
.rail-app .rail-icon .icon { width: 21px; height: 21px; transition: transform var(--t-med) var(--ease); }
.rail-app .rail-label { font-size: 10.5px; font-weight: 620; letter-spacing: .015em; }
.rail-app:hover { color: var(--ink-1); background: var(--surface-hover); }
.rail-app:hover .rail-icon .icon { transform: translateY(-1px); }
.rail-app.is-active { color: var(--accent); background: var(--accent-soft); }
.rail-app.is-active::before {
  content: ""; position: absolute; left: -8px; top: 50%; translate: 0 -50%;
  width: 3px; height: 22px; border-radius: 3px; background: var(--accent);
  animation: railPill var(--t-med) var(--ease);
}
@keyframes railPill { from { height: 0; opacity: 0; } }
.rail-dot {
  position: absolute; top: 8px; right: 12px; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--surface-0);
  animation: popIn var(--t-slow) var(--ease); display: none;
}
.rail-dot.is-visible { display: block; }

.rail-foot { margin-top: auto; display: flex; flex-direction: column; align-items: center; gap: 4px; width: 100%; padding: 0 8px; }
.rail-btn {
  width: 44px; height: 44px; border-radius: var(--r-md); color: var(--ink-3);
  display: inline-flex; align-items: center; justify-content: center; position: relative;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.rail-btn:hover { color: var(--ink-1); background: var(--surface-hover); }
.rail-btn:active { transform: scale(.93); }
.rail-avatar { border-radius: 50%; overflow: visible; }
.rail-avatar .avatar { width: 32px; height: 32px; box-shadow: 0 0 0 2px var(--surface-0); }
.rail-avatar.is-away .avatar::after {
  content: ""; position: absolute; right: 0; bottom: 0; width: 10px; height: 10px;
  border-radius: 50%; background: var(--success); border: 2px solid var(--surface-0);
}

/* ============================= Topbar ============================= */
.topbar {
  height: var(--topbar-h); flex: none;
  display: grid; grid-template-columns: auto minmax(0, var(--omni-w)) auto;
  align-items: center; gap: 16px; padding: 0 16px 0 8px;
  background: var(--glass); backdrop-filter: blur(18px) saturate(1.4); -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid var(--line); z-index: 35; position: relative;
}
.topbar-left { display: flex; align-items: center; gap: 8px; min-width: 0; }
.crumb { display: flex; align-items: center; gap: 6px; font-size: 14px; min-width: 0; }
.crumb-app { font-weight: 700; color: var(--ink-1); }
.crumb-sep { color: var(--ink-4); display: flex; }
.crumb-sep .icon { width: 13px; height: 13px; }
.crumb-leaf { color: var(--ink-2); font-weight: 560; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.omni { position: relative; width: 100%; }
.omni-glyph { position: absolute; left: 12px; top: 50%; translate: 0 -50%; color: var(--ink-3); display: flex; pointer-events: none; transition: color var(--t-fast) var(--ease); }
.omni.is-focused .omni-glyph { color: var(--accent); }
.omni-input {
  width: 100%; height: 38px; border-radius: var(--r-md);
  background: var(--surface-sunken); border: 1px solid transparent;
  padding: 0 44px 0 38px; font-size: 13.5px; color: var(--ink-1);
  transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.omni-input::-webkit-search-cancel-button { -webkit-appearance: none; }
.omni-input::placeholder { color: var(--ink-4); }
.omni-input:hover { border-color: var(--line-strong); }
.omni.is-focused .omni-input, .omni-input:focus {
  outline: none; background: var(--surface-1); border-color: var(--accent-line);
  box-shadow: 0 0 0 3px var(--accent-softer), var(--shadow-1);
}
.omni-kbd { position: absolute; right: 10px; top: 50%; translate: 0 -50%; pointer-events: none; }
.omni.is-focused .omni-kbd { display: none; }

.omni-results {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--shadow-pop); overflow: hidden; z-index: 90;
  max-height: min(520px, calc(100dvh - 120px)); overflow-y: auto;
  animation: popIn var(--t-med) var(--ease);
}
.omni-group { padding: 8px; }
.omni-group + .omni-group { border-top: 1px solid var(--line-soft); }
.omni-group-title {
  display: flex; align-items: center; gap: 7px;
  font-size: 11px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase;
  color: var(--ink-3); padding: 6px 10px 4px;
}
.omni-group-title .icon { width: 13px; height: 13px; }
.omni-group-title .omni-more { margin-left: auto; font-size: 11px; letter-spacing: 0; text-transform: none; color: var(--accent); font-weight: 640; cursor: pointer; border-radius: 4px; padding: 2px 6px; }
.omni-group-title .omni-more:hover { background: var(--accent-soft); }
.omni-item {
  width: 100%; display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: var(--r-sm); text-align: left;
  transition: background var(--t-fast) var(--ease);
}
.omni-item:hover, .omni-item.is-cursor { background: var(--surface-hover); }
.omni-item-main { min-width: 0; flex: 1; }
.omni-item-top { display: flex; gap: 8px; align-items: baseline; }
.omni-item-title { font-weight: 600; font-size: 13.5px; color: var(--ink-1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.omni-item-sub { font-size: 12px; color: var(--ink-3); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 1px; }
.omni-item mark { background: var(--accent-soft); color: var(--on-accent-soft); border-radius: 3px; padding: 0 1px; }
.omni-empty { padding: 28px 16px; text-align: center; color: var(--ink-3); font-size: 13px; }
.omni-empty .empty-art { width: 90px; height: 76px; margin: 0 auto 10px; }
.omni-hint { display: flex; gap: 14px; justify-content: center; padding: 10px; border-top: 1px solid var(--line-soft); font-size: 11.5px; color: var(--ink-3); }
.omni-hint span { display: inline-flex; align-items: center; gap: 6px; }

.topbar-right { display: flex; align-items: center; gap: 8px; justify-content: flex-end; }
.topbar-new {
  display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 16px 0 13px;
  border-radius: var(--r-md); background: var(--accent); color: #fff;
  font-weight: 640; font-size: 13.5px;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--accent) 40%, transparent);
  transition: background var(--t-fast) var(--ease), transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.topbar-new:hover { background: var(--accent-strong); box-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 50%, transparent); }
.topbar-new:active { transform: scale(.97); }
.bell-dot {
  position: absolute; top: 7px; right: 7px; width: 8px; height: 8px; border-radius: 50%;
  background: var(--danger); border: 2px solid var(--topbar-bg, var(--surface-1));
}
.bell-dot::after { content: ""; position: absolute; inset: -2px; border-radius: 50%; background: var(--danger); animation: ping 1.8s var(--ease) infinite; z-index: -1; }

/* ============================= Views ============================= */
.views { flex: 1; min-height: 0; position: relative; }
.view { height: 100%; display: flex; min-width: 0; animation: viewIn var(--t-slow) var(--ease); }
.view[hidden] { display: none !important; }
@keyframes viewIn { from { opacity: 0; transform: translateY(6px) scale(.995); } }

/* ============================= Popover / menus ============================= */
.pop {
  position: fixed; z-index: 120; min-width: 200px; max-width: 340px;
  background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--shadow-pop); padding: 6px;
  animation: popIn var(--t-med) var(--ease);
  max-height: min(480px, calc(100dvh - 24px)); overflow-y: auto;
}
.menu { display: flex; flex-direction: column; }
.menu-item {
  display: flex; align-items: center; gap: 10px; width: 100%;
  min-height: 34px; padding: 6px 10px; border-radius: var(--r-sm);
  font-size: 13.5px; color: var(--ink-1); text-align: left; font-weight: 480;
  transition: background var(--t-fast) var(--ease);
}
.menu-item:hover, .menu-item.is-cursor { background: var(--surface-hover); }
.menu-item .icon { color: var(--ink-3); width: 16px; height: 16px; }
.menu-item:hover .icon { color: var(--ink-1); }
.menu-item.is-danger { color: var(--danger); }
.menu-item.is-danger .icon { color: var(--danger); }
.menu-item.is-on { color: var(--accent); font-weight: 620; }
.menu-item.is-on .icon { color: var(--accent); }
.menu-item .menu-check { margin-left: auto; display: flex; visibility: hidden; color: var(--accent); }
.menu-item.is-on .menu-check { visibility: visible; }
.menu-item .menu-right { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; color: var(--ink-3); font-size: 12px; }
.menu-item .menu-kbd { opacity: .75; }
.menu-sep { height: 1px; background: var(--line-soft); margin: 5px 8px; }
.menu-title { padding: 8px 10px 4px; font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.menu-sub-title { display: flex; align-items: center; gap: 8px; padding: 8px 10px 6px; font-size: 12.5px; font-weight: 650; color: var(--ink-2); }
.menu-sub-title .icon { width: 14px; height: 14px; }
.menu-color-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; padding: 6px 10px 10px; }
.menu-swatch { width: 26px; height: 26px; border-radius: 50%; position: relative; transition: transform var(--t-fast) var(--ease); }
.menu-swatch:hover { transform: scale(1.14); }
.menu-swatch.is-on::after {
  content: ""; position: absolute; inset: -4px; border-radius: 50%;
  border: 2px solid currentColor;
}

/* Context menu (right-click) variant */
.pop.ctx { min-width: 220px; }

/* ============================= Toasts ============================= */
.toasts {
  position: fixed; bottom: 20px; left: 50%; translate: -50% 0; z-index: 160;
  display: flex; flex-direction: column-reverse; align-items: center; gap: 10px;
  pointer-events: none;
}
.toast {
  pointer-events: auto; display: flex; align-items: center; gap: 12px;
  min-width: 300px; max-width: min(520px, calc(100vw - 40px));
  padding: 10px 12px 10px 16px; border-radius: var(--r-lg);
  background: var(--surface-3); border: 1px solid var(--line);
  box-shadow: var(--shadow-3); font-size: 13.5px;
  animation: toastIn var(--t-slow) var(--ease);
  transition: opacity var(--t-med) var(--ease), transform var(--t-med) var(--ease);
}
.toast.is-leaving { opacity: 0; transform: translateY(10px) scale(.98); }
.toast-ico { width: 30px; height: 30px; border-radius: var(--r-sm); display: flex; align-items: center; justify-content: center; flex: none; }
.toast-ico.ok { background: var(--success-soft); color: var(--success); }
.toast-ico.info { background: var(--accent-soft); color: var(--accent); }
.toast-ico.warn { background: var(--warning-soft); color: var(--warning); }
.toast-ico.err { background: var(--danger-soft); color: var(--danger); }
.toast-msg { flex: 1; min-width: 0; color: var(--ink-1); }
.toast-msg strong { font-weight: 660; }
.toast-undo {
  height: 30px; padding: 0 12px; border-radius: var(--r-sm); font-weight: 650; font-size: 12.5px;
  color: var(--accent); background: var(--accent-soft);
  transition: background var(--t-fast) var(--ease); flex: none;
}
.toast-undo:hover { background: color-mix(in srgb, var(--accent) 24%, transparent); }
.toast-x { width: 26px; height: 26px; border-radius: var(--r-xs); display: flex; align-items: center; justify-content: center; color: var(--ink-3); flex: none; }
.toast-x:hover { background: var(--surface-hover); color: var(--ink-1); }
.toast-life { position: absolute; bottom: 2px; left: 16px; right: 76px; height: 2px; border-radius: 2px; background: var(--accent); transform-origin: left; animation: toastLife linear forwards; }
@keyframes toastLife { from { transform: scaleX(1); } to { transform: scaleX(0); } }

/* ============================= Modal / dialog ============================= */
.modal-scrim {
  position: fixed; inset: 0; z-index: 140; background: var(--scrim);
  backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center; padding: 24px;
  animation: fadeIn var(--t-med) var(--ease);
}
.modal-scrim.is-closing { animation: modalOut var(--t-med) var(--ease) forwards; }
@keyframes modalOut { to { opacity: 0; } }
.modal {
  width: min(560px, 100%); max-height: min(760px, calc(100dvh - 48px));
  display: flex; flex-direction: column;
  background: var(--surface-3); border: 1px solid var(--line); border-radius: var(--r-xl);
  box-shadow: var(--shadow-3); overflow: hidden;
  animation: modalIn var(--t-slow) var(--ease);
}
@keyframes modalIn { from { opacity: 0; transform: translateY(16px) scale(.97); } }
.modal.wide { width: min(760px, 100%); }
.modal-head { display: flex; align-items: center; gap: 10px; padding: 18px 20px 0; }
.modal-title { font-size: 17px; font-weight: 700; flex: 1; }
.modal-body { padding: 16px 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 14px; }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; padding: 14px 20px 18px; border-top: 1px solid var(--line-soft); }

/* Shortcut sheet */
.kbd-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 28px; }
.kbd-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--line-soft); }
.kbd-row:last-child { border-bottom: 0; }
.kbd-row-desc { font-size: 13px; color: var(--ink-2); }
.kbd-keys { display: inline-flex; gap: 4px; }

/* ============================= Side drawer (settings) ============================= */
.drawer-scrim { position: fixed; inset: 0; z-index: 130; background: var(--scrim); animation: fadeIn var(--t-med) var(--ease); }
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 131; width: min(400px, 100vw);
  background: var(--surface-1); border-left: 1px solid var(--line); box-shadow: var(--shadow-3);
  display: flex; flex-direction: column; animation: drawerIn var(--t-slow) var(--ease);
}
@keyframes drawerIn { from { transform: translateX(40px); opacity: 0; } }
.drawer-head { display: flex; align-items: center; gap: 10px; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.drawer-title { font-size: 16.5px; font-weight: 700; flex: 1; }
.drawer-body { flex: 1; overflow-y: auto; padding: 8px 20px 24px; }
.set-group { padding: 16px 0 4px; }
.set-group + .set-group { border-top: 1px solid var(--line-soft); margin-top: 10px; }
.set-group-title { font-size: 11.5px; font-weight: 750; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 12px; }
.set-row { display: flex; align-items: center; gap: 12px; padding: 8px 0; min-height: 40px; }
.set-main { flex: 1; min-width: 0; }
.set-name { font-size: 13.5px; font-weight: 580; }
.set-desc { font-size: 12px; color: var(--ink-3); margin-top: 1px; }
.set-ctrl { flex: none; display: flex; align-items: center; gap: 8px; }
.set-swatches { display: flex; gap: 8px; padding: 4px 0 8px; }
.set-swatch { width: 30px; height: 30px; border-radius: var(--r-sm); position: relative; transition: transform var(--t-fast) var(--ease); }
.set-swatch:hover { transform: translateY(-2px); }
.set-swatch.is-on::after { content: ""; position: absolute; inset: -4px; border-radius: var(--r-sm); border: 2px solid var(--accent); }

/* Notifications popover */
.notif-pop { width: 372px; max-height: 480px; display: flex; flex-direction: column; padding: 0; }
.notif-head { display: flex; align-items: center; padding: 14px 16px 10px; gap: 8px; border-bottom: 1px solid var(--line-soft); }
.notif-head-title { font-size: 14.5px; font-weight: 700; flex: 1; }
.notif-list { overflow-y: auto; padding: 6px; }
.notif-item { display: flex; gap: 11px; padding: 10px 10px; border-radius: var(--r-md); transition: background var(--t-fast) var(--ease); position: relative; cursor: pointer; }
.notif-item:hover { background: var(--surface-hover); }
.notif-item.is-unread::before { content: ""; position: absolute; left: 2px; top: 16px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.notif-ico { width: 34px; height: 34px; border-radius: var(--r-md); flex: none; display: flex; align-items: center; justify-content: center; background: var(--accent-soft); color: var(--accent); }
.notif-title { font-size: 13px; font-weight: 620; }
.notif-body { font-size: 12.5px; color: var(--ink-2); margin-top: 1px; line-height: 1.45; }
.notif-time { font-size: 11px; color: var(--ink-3); margin-top: 3px; }
.notif-empty { padding: 40px 20px; text-align: center; color: var(--ink-3); }
.notif-empty .empty-art { width: 110px; height: 92px; margin: 0 auto 12px; }

/* Account popover */
.acct-pop { width: 312px; padding: 0; }
.acct-me { display: flex; gap: 12px; padding: 16px; align-items: center; border-bottom: 1px solid var(--line-soft); }
.acct-name { font-weight: 700; font-size: 14.5px; }
.acct-mail { font-size: 12.5px; color: var(--ink-3); }

/* ============================= Tooltip ============================= */
.tooltip {
  position: fixed; z-index: 200; pointer-events: none;
  padding: 5px 9px; border-radius: 7px;
  background: var(--ink-1); color: var(--surface-1);
  font-size: 12px; font-weight: 560; white-space: nowrap;
  box-shadow: var(--shadow-2); opacity: 0;
  transition: opacity var(--t-fast) var(--ease);
}
:root[data-theme="dark"] .tooltip { background: #313850; color: #eef0fa; border: 1px solid var(--line-strong); }

/* ============================= Veil (for side panes on small screens) ============================= */
.veil { position: fixed; inset: 0; z-index: 45; background: var(--scrim); animation: fadeIn var(--t-med) var(--ease); }

/* ============================= Responsive ============================= */
@media (max-width: 1280px) {
  :root { --omni-w: 440px; --folder-w: 232px; }
}
@media (max-width: 1080px) {
  :root { --rail-w: 60px; --omni-w: 380px; }
  .rail-app .rail-label { display: none; }
  .rail-app { height: 48px; }
  .rail-logo { width: 38px; height: 38px; }
  .rail-btn { width: 40px; height: 40px; }
  .rail-app.is-active::before { left: -6px; }
  .topbar-new-label { display: none; }
  .topbar-new { padding: 0 11px; }
  .crumb { display: none; }
}
@media (max-width: 860px) {
  :root { --topbar-h: 52px; }
  .topbar { grid-template-columns: auto 1fr auto; gap: 8px; padding: 0 10px 0 6px; }
  .omni-kbd { display: none; }
  .app[data-nav-open="1"] .veil { display: block; }
}
@media (max-width: 620px) {
  :root { --rail-w: 52px; }
  .omni-input { padding-left: 34px; font-size: 13px; }
  .omni-results { position: fixed; left: 8px; right: 8px; top: calc(var(--topbar-h) + 4px); }
  .kbd-grid { grid-template-columns: 1fr; }
  .topbar-new-label { display: none; }
  .modal-scrim { padding: 0; align-items: flex-end; }
  .modal { width: 100%; max-height: 92dvh; border-radius: var(--r-xl) var(--r-xl) 0 0; animation: sheetIn var(--t-slow) var(--ease); }
  @keyframes sheetIn { from { transform: translateY(40px); opacity: 0; } }
}