/* ============================================================
   desktop.css — Niri-style tiling window manager desktop
   ============================================================ */

/* --- Theme variables --- */
:root {
  color-scheme: dark light;

  --accent:        #069;
  --accent-glow:   #0af;
  --accent-light:  #6bf;

  --topbar-bg:     rgba(0, 30, 50, 0.78);
  --topbar-border: rgba(255, 255, 255, 0.10);
  --topbar-text:   #e8f4ff;
  --btn-hover:     rgba(255, 255, 255, 0.14);
  --btn-active:    rgba(255, 255, 255, 0.22);

  --app-bg:        rgba(0, 45, 70, 0.82);
  --app-border:    rgba(255, 255, 255, 0.11);
  --app-text:      #ddeeff;
  --toolbar-bg:    rgba(0, 25, 45, 0.55);
  --toolbar-sep:   rgba(255, 255, 255, 0.09);

  --overlay-bg:    rgba(0, 15, 28, 0.92);
  --overlay-card:  rgba(0, 55, 85, 0.80);

  --focus-color:   #0af;
  --focus-ring:    0 0 0 0.25rem var(--focus-color);

  --backdrop:      blur(14px) saturate(0.55) brightness(0.75);
  --toolbar-backdrop: blur(8px) saturate(0.6) brightness(0.8);

  --scrollbar-thumb: rgba(0, 102, 153, 0.55);
  --scrollbar-track: rgba(0, 0, 0, 0.20);

  --gap:  1rem;
  --edge: 2rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --topbar-bg:     rgba(225, 243, 255, 0.82);
    --topbar-border: rgba(0, 80, 130, 0.14);
    --topbar-text:   #002840;
    --btn-hover:     rgba(0, 80, 130, 0.10);
    --btn-active:    rgba(0, 80, 130, 0.18);

    --app-bg:        rgba(240, 250, 255, 0.88);
    --app-border:    rgba(0, 80, 130, 0.14);
    --app-text:      #001f33;
    --toolbar-bg:    rgba(210, 238, 255, 0.72);
    --toolbar-sep:   rgba(0, 80, 130, 0.12);

    --overlay-bg:    rgba(210, 238, 255, 0.95);
    --overlay-card:  rgba(255, 255, 255, 0.85);

    --focus-color:   #069;
    --backdrop:      blur(14px) sepia(0.15) brightness(1.08);
    --toolbar-backdrop: blur(8px) brightness(1.05);

    --scrollbar-thumb: rgba(0, 80, 130, 0.40);
    --scrollbar-track: rgba(0, 0, 0, 0.06);
  }
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background-image:
    repeating-linear-gradient(to right, transparent 0, transparent 2px, #0004 2px, #0004 4px),
    repeating-linear-gradient(to bottom, transparent 0, transparent 2px, #0004 2px, #0004 4px),
    repeating-radial-gradient(transparent 0, transparent 3px, #0001 3px, #0001 6px),
    url("https://jeffreytackett.us/ssl/resources/scripts/random_picture.php");
  background-position: center center;
  background-size: cover;
  background-attachment: fixed;
  background-color: #069;
  color: var(--app-text);
}

/* ============================================================
   TOP BAR
   ============================================================ */
#topbar {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 3rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding-inline: 0.375rem;
  gap: 0.5rem;
  background-color: var(--topbar-bg);
  -webkit-backdrop-filter: var(--backdrop);
  backdrop-filter: var(--backdrop);
  border-bottom: 1px solid var(--topbar-border);
  color: var(--topbar-text);
  z-index: 1000;
  user-select: none;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-width: 0;
  overflow: hidden;
}

.topbar-center {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  overflow: hidden;
}

#active-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 28ch;
}

.topbar-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.125rem;
}

@media (max-width: 640px) and (orientation: portrait) {
  #width-controls { display: none; }
}

#width-controls {
  display: flex;
  align-items: center;
  gap: 0.0625rem;
  padding-right: 0.25rem;
  border-right: 1px solid var(--topbar-border);
  margin-right: 0.125rem;
}

/* ============================================================
   ICON BUTTONS (shared)
   ============================================================ */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 0.5rem;
  background: transparent;
  color: inherit;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color 120ms ease, opacity 120ms ease;
}

.icon-btn:hover  { background-color: var(--btn-hover); }
.icon-btn:active { background-color: var(--btn-active); }

.width-btn[aria-pressed="true"] {
  background-color: var(--btn-active);
  box-shadow: inset 0 0 0 1.5px var(--focus-color);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 1px;
}

.icon-btn:disabled {
  opacity: 0.32;
  cursor: default;
  pointer-events: none;
}

#app-menu-btn[aria-expanded="true"] {
  background-color: var(--accent);
  color: #fff;
}

/* ============================================================
   OPEN-APPS BAR
   ============================================================ */
#open-apps-bar {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  overflow-x: auto;
  scrollbar-width: none;
}

#open-apps-bar::-webkit-scrollbar { display: none; }

.app-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3125rem;
  padding: 0.25rem 0.5625rem;
  border: none;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.10);
  color: var(--topbar-text);
  cursor: pointer;
  font-size: 0.75rem;
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color 120ms ease, color 120ms ease;
}

.app-tab-btn svg { width: 13px; height: 13px; flex-shrink: 0; }
.app-tab-btn:hover  { background-color: var(--btn-hover); }
.app-tab-btn:active { background-color: var(--btn-active); }
.app-tab-btn.focused { background-color: var(--accent); color: #fff; }

.app-tab-btn:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 1px;
}

/* ============================================================
   APP MENU OVERLAY
   ============================================================ */
#app-menu {
  position: fixed;
  inset: 3rem 0 0;
  background-color: var(--overlay-bg);
  -webkit-backdrop-filter: blur(20px) saturate(0.6);
  backdrop-filter: blur(20px) saturate(0.6);
  z-index: 900;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 2.5rem 1rem 2rem;
  overflow-y: auto;
  animation: fadeIn 160ms ease;
}

#app-menu[hidden] { display: none; }

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

#app-menu-inner { width: 100%; max-width: 480px; }

.app-menu-heading {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--topbar-text);
  opacity: 0.55;
}

#app-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 1rem;
}

.app-launcher {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  padding: 1.375rem 1rem 1.125rem;
  border: 1px solid var(--app-border);
  border-radius: 1rem;
  background: var(--overlay-card);
  -webkit-backdrop-filter: var(--backdrop);
  backdrop-filter: var(--backdrop);
  color: var(--app-text);
  cursor: pointer;
  font-family: inherit;
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.app-launcher:hover {
  transform: scale(1.05);
  box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, 0.35);
}

.app-launcher:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 2px;
}

.app-launcher-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 0.875rem;
  background: rgba(0, 102, 153, 0.28);
  color: var(--accent-light);
}

.app-launcher-icon svg { width: 32px; height: 32px; }

.app-launcher-name {
  font-size: 0.8125rem;
  font-weight: 500;
  text-align: center;
  color: var(--topbar-text);
}

/* ============================================================
   DESKTOP / APP STRIP
   ============================================================ */
#desktop {
  position: fixed;
  inset-block-start: 3rem;
  inset-inline: 0;
  bottom: 0;
  overflow: hidden;
}

#empty-state {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

#empty-state[hidden] { display: none; }

#app-strip-wrapper {
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none;
  display: flex;
  align-items: stretch;
}

#app-strip-wrapper::-webkit-scrollbar { display: none; }

#app-strip {
  display: flex;
  align-items: flex-start;
  flex-shrink: 0;
  gap: var(--gap);
  min-height: 100%;
  padding-block: 1rem;
  padding-inline: var(--edge);
}

#app-strip.center-apps { justify-content: center; }

#app-strip-wrapper {
  scroll-padding-inline-start: var(--edge);
}

@media (max-width: 640px) and (orientation: portrait) {
  #app-strip {
    padding-inline: 0;
    gap: 0;
  }
  #app-strip-wrapper {
    scroll-padding-inline-start: 0;
  }
}

@media (min-width: 1024px) {
  #app-strip {
    min-width: 100%;
    justify-content: center;
  }
}

/* ============================================================
   COLUMNS
   ============================================================ */
.app-col {
  --app-width: calc(100vw - 2 * var(--edge));
  flex-shrink: 0;
  width: var(--app-width);
  height: calc(100dvh - 5rem);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  scroll-snap-align: start;
  position: relative;
  transform-origin: center top;
}

@media (max-width: 640px) and (orientation: portrait) {
  .app-col { --app-width: 100vw; }
}

@media (min-width: 1024px) {
  .app-col {
    --app-width: calc((100vw - 2 * var(--edge) - var(--gap)) / 2);
  }
}

@keyframes widthShrink {
  from { transform: scaleX(1)    scaleY(1);    }
  to   { transform: scaleX(0.88) scaleY(1.03); }
}

@keyframes widthGrow {
  0%   { transform: scaleX(0.88) scaleY(1.03); }
  65%  { transform: scaleX(1.02) scaleY(0.99); }
  100% { transform: scaleX(1)    scaleY(1);    }
}

.app-col.width-shrink {
  animation: widthShrink 110ms cubic-bezier(0.4, 0, 1, 1) forwards;
}

.app-col.width-grow {
  animation: widthGrow 220ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* ── Win drag ghost (icon + title, fixed overlay) ── */
.app-window.win-drag-ghost {
  z-index: 500 !important;
  pointer-events: none;
  display: flex !important;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 56px rgba(0, 0, 0, 0.65), 0 4px 14px rgba(0, 0, 0, 0.35);
  will-change: transform;
  opacity: 0.85;
  cursor: grabbing;
}

.win-ghost-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  opacity: 0.6;
  pointer-events: none;
}

.win-ghost-icon svg {
  width: 3rem;
  height: 3rem;
}

.win-ghost-title {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* ── Win placeholder (window stays in-place during drag) ── */
.app-window.win-placeholder {
  background: color-mix(in srgb, var(--accent) 6%, transparent) !important;
  border-color: color-mix(in srgb, var(--accent) 40%, transparent) !important;
  border-style: dashed !important;
}
.app-window.win-placeholder > * { visibility: hidden; }

/* ── Col placeholder (narrow slot for single-window col drag) ── */
.app-col.col-placeholder {
  width: calc(var(--app-width) / 6) !important;
  min-width: 2.5rem;
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 2px dashed color-mix(in srgb, var(--accent) 50%, transparent);
  border-radius: 0.75rem;
  overflow: hidden;
  pointer-events: none;
}
.app-col.col-placeholder > * { visibility: hidden; }

/* ── Drop zones ── */
.drag-zone {
  position: fixed;
  z-index: 490;
  pointer-events: none;
  box-sizing: border-box;
  border: 2px dashed color-mix(in srgb, var(--accent-glow) 65%, transparent);
  border-radius: 0.625rem;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  opacity: 0.75;
  transition: background 100ms, border-color 100ms, opacity 100ms, border-style 80ms;
}
.drag-zone.hovered {
  border-style: solid;
  border-color: var(--accent-glow);
  background: color-mix(in srgb, var(--accent-glow) 28%, transparent);
  opacity: 1;
}

/* ============================================================
   DRAG HANDLE (per-window)
   ============================================================ */
.win-drag-handle {
  position: absolute;
  top: 0;
  left: 50%;
  translate: -50% 0;
  width: 3.25rem;
  height: 1.125rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 30;
  cursor: grab;
  border-radius: 0 0 0.5rem 0.5rem;
  background: rgba(0, 30, 50, 0.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid var(--topbar-border);
  border-top: none;
  color: var(--topbar-text);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
}

.win-drag-handle:active { cursor: grabbing; }

.app-window:hover .win-drag-handle {
  opacity: 1;
  pointer-events: all;
}

#app-strip.mod-held .win-drag-handle {
  opacity: 1;
  pointer-events: all;
}

@media (pointer: coarse) {
  .win-drag-handle {
    opacity: 0.75;
    pointer-events: all;
  }
}

@media (prefers-color-scheme: light) {
  .win-drag-handle {
    background: rgba(225, 243, 255, 0.85);
  }
}

/* ============================================================
   APP WINDOWS
   ============================================================ */
.app-window {
  flex: 1;
  min-height: 0;
  width: 100%;
  border-radius: 1rem;
  border: 1px solid var(--app-border);
  background-color: var(--app-bg);
  -webkit-backdrop-filter: var(--backdrop);
  backdrop-filter: var(--backdrop);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  outline: 0.25rem solid transparent;
  outline-offset: 0;
  transition: box-shadow 200ms ease, outline-color 200ms ease;
  position: relative;
  container-type: inline-size;
}

.app-window.focused {
  outline-color: var(--focus-color);
  box-shadow: 0 0.5rem 2.5rem rgba(0, 170, 255, 0.22);
}

@media (max-width: 640px) and (orientation: portrait) {
  .app-window {
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}

/* ============================================================
   APP TOOLBAR (shared)
   ============================================================ */
.app-toolbar {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  padding: 0.375rem 0.625rem;
  background-color: var(--toolbar-bg);
  -webkit-backdrop-filter: var(--toolbar-backdrop);
  backdrop-filter: var(--toolbar-backdrop);
  border-bottom: 1px solid var(--toolbar-sep);
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.app-toolbar::-webkit-scrollbar { display: none; }

.toolbar-sep {
  flex: 1;
  min-width: 0.25rem;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  padding: 0.3125rem 0.5rem;
  border: none;
  border-radius: 0.5rem;
  background: transparent;
  color: var(--app-text);
  cursor: pointer;
  font-size: 0.75rem;
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color 120ms ease, opacity 120ms ease;
}

.tool-btn:hover  { background-color: var(--btn-hover); }
.tool-btn:active { background-color: var(--btn-active); }

.tool-btn:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 1px;
}

.tool-btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.tool-btn .lbl { display: none; }

@container (width > 380px) {
  .tool-btn .lbl { display: inline; }
}

.zoom-readout {
  font-size: 0.6875rem;
  min-width: 3ch;
  text-align: center;
  opacity: 0.65;
  padding: 0 0.125rem;
  flex-shrink: 0;
}

/* ============================================================
   APP CONTENT AREA
   ============================================================ */
.app-content {
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ============================================================
   DOCUMENT VIEWER
   ============================================================ */
.doc-scroll {
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 2rem 2.5rem;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}

.doc-body {
  max-width: 68ch;
  margin-inline: auto;
  line-height: 1.75;
  color: var(--app-text);
  font-size: var(--doc-size, 1rem);
  transition: font-size 120ms ease;
}

.doc-body h1 {
  font-size: 1.75em;
  font-weight: 700;
  margin: 0 0 0.2em;
  line-height: 1.2;
  color: var(--app-text);
}

.doc-body h2 {
  font-size: 1.125em;
  font-weight: 600;
  margin: 2em 0 0.5em;
  color: var(--accent-light);
}

.doc-body h3 {
  font-size: 1em;
  font-weight: 600;
  margin: 1.5em 0 0.4em;
  opacity: 0.85;
}

@media (prefers-color-scheme: light) {
  .doc-body h2 { color: var(--accent); }
}

.doc-body p   { margin: 0 0 0.875em; text-wrap: pretty; }
.doc-body ul,
.doc-body ol  { margin: 0 0 0.875em; padding-left: 1.5em; }
.doc-body li  { margin-bottom: 0.3em; }
.doc-body hr  { border: none; border-top: 1px solid var(--app-border); margin: 1.5em 0; }

.doc-body code {
  background: rgba(0, 102, 153, 0.18);
  padding: 0.1em 0.35em;
  border-radius: 0.25em;
  font-size: 0.9em;
  font-family: 'Courier New', Courier, monospace;
}

.doc-body pre {
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--app-border);
  border-radius: 0.5rem;
  padding: 1em 1.25em;
  overflow-x: auto;
  margin: 0 0 1em;
}

.doc-body pre code {
  background: none;
  padding: 0;
  font-size: 0.875em;
}

@media (prefers-color-scheme: light) {
  .doc-body pre { background: rgba(0, 80, 130, 0.06); }
}

.doc-body a {
  color: var(--accent-light);
  text-decoration: underline;
  text-decoration-color: rgba(102, 187, 255, 0.4);
}

@media (prefers-color-scheme: light) {
  .doc-body a { color: var(--accent); }
}

/* Tables */
.doc-body .md-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1em;
  font-size: 0.9em;
}

.doc-body .md-table th,
.doc-body .md-table td {
  padding: 0.4375em 0.75em;
  border: 1px solid var(--app-border);
  text-align: left;
}

.doc-body .md-table th {
  background: rgba(0, 102, 153, 0.18);
  font-weight: 600;
}

.doc-body .md-table tr:nth-child(even) td {
  background: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: light) {
  .doc-body .md-table th { background: rgba(0, 80, 130, 0.1); }
  .doc-body .md-table tr:nth-child(even) td { background: rgba(0, 80, 130, 0.04); }
}

/* Welcome / status states */
.doc-welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.875rem;
  padding: 5rem 2rem;
  text-align: center;
  opacity: 0.55;
  min-height: 12rem;
}

.doc-welcome-icon {
  width: 3rem;
  height: 3rem;
  opacity: 0.6;
}

.doc-welcome p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  max-width: 30ch;
}

.doc-status {
  margin: 3rem auto;
  text-align: center;
  opacity: 0.5;
  font-size: 0.875rem;
}

.doc-error { color: #f87171; opacity: 1; }

/* ============================================================
   IMAGE VIEWER
   ============================================================ */
.img-viewport {
  height: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.25);
  cursor: grab;
}

.img-viewport:active { cursor: grabbing; }

.img-transform {
  transform-origin: center center;
  transition: transform 180ms cubic-bezier(0.4, 0, 0.2, 1);
  line-height: 0;
}

.img-viewport img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 0.25rem;
  user-select: none;
  -webkit-user-drag: none;
}

/* ============================================================
   MEDIA PLAYER
   ============================================================ */
.media-player-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
}

.media-player-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
  padding: 2rem;
  opacity: 0.45;
}

.media-empty-icon {
  width: 3.5rem;
  height: 3.5rem;
  opacity: 0.6;
  color: var(--app-text);
}

.media-player-empty p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  max-width: 28ch;
  color: var(--app-text);
}

.media-video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}

.media-title-lbl {
  font-size: 0.8125rem;
  opacity: 0.75;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 30ch;
  padding: 0 0.25rem;
}

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  translate: -50% 0;
  background: rgba(0, 0, 0, 0.82);
  color: #fff;
  padding: 0.4375rem 1rem;
  border-radius: 2rem;
  font-size: 0.8125rem;
  pointer-events: none;
  z-index: 50;
  white-space: nowrap;
  animation: toastIn 200ms ease, toastOut 200ms ease 2.2s forwards;
}

@keyframes toastIn  { from { opacity: 0; translate: -50% 0.5rem; } to { opacity: 1; translate: -50% 0; } }
@keyframes toastOut { from { opacity: 1; } to { opacity: 0; } }

/* ============================================================
   HELP OVERLAY
   ============================================================ */
#help-overlay {
  position: fixed;
  inset: 3rem 0 0;
  background-color: var(--overlay-bg);
  -webkit-backdrop-filter: blur(20px) saturate(0.6);
  backdrop-filter: blur(20px) saturate(0.6);
  z-index: 950;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 2.5rem 1rem 2rem;
  overflow-y: auto;
  animation: fadeIn 160ms ease;
}

#help-overlay[hidden] { display: none; }

#help-inner { width: 100%; max-width: 420px; }

.help-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.help-title {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--topbar-text);
  opacity: 0.55;
}

.shortcut-list {
  margin: 0 0 1.25rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.shortcut-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.625rem 0.875rem;
  border-radius: 0.625rem;
  background: var(--overlay-card);
  -webkit-backdrop-filter: var(--backdrop);
  backdrop-filter: var(--backdrop);
}

.shortcut-row dt {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

.shortcut-row dd {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--topbar-text);
  text-align: right;
}

kbd {
  display: inline-block;
  padding: 0.125rem 0.4375rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-bottom-width: 2px;
  border-radius: 0.3125rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--topbar-text);
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
}

@media (prefers-color-scheme: light) {
  kbd {
    border-color: rgba(0, 80, 130, 0.3);
    border-bottom-color: rgba(0, 80, 130, 0.5);
    background: rgba(0, 80, 130, 0.07);
  }
}

.help-note {
  margin: 0 0 1.25rem;
  font-size: 0.75rem;
  color: var(--topbar-text);
  opacity: 0.45;
  text-align: center;
}

.help-actions { display: flex; justify-content: center; }

.help-launch-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: 1px solid var(--app-border);
  border-radius: 0.625rem;
  background: var(--overlay-card);
  -webkit-backdrop-filter: var(--backdrop);
  backdrop-filter: var(--backdrop);
  color: var(--topbar-text);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 140ms ease, transform 140ms ease;
}

.help-launch-btn:hover  { background-color: var(--btn-hover); transform: translateY(-1px); }
.help-launch-btn:active { transform: none; }
.help-launch-btn:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 2px; }

/* ============================================================
   FILE MANAGER
   ============================================================ */
.fm-layout {
  display: flex;
  height: 100%;
  overflow: hidden;
}

/* ── Sidebar ── */
.fm-sidebar {
  width: 10rem;
  flex-shrink: 0;
  border-right: 1px solid var(--toolbar-sep);
  padding: 0.625rem 0.375rem;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  overflow-y: auto;
  scrollbar-width: none;
}

.fm-sidebar::-webkit-scrollbar { display: none; }

@container (width < 380px) {
  .fm-sidebar       { width: 3rem; }
  .fm-sidebar-label { display: none; }
}

.fm-sidebar-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.4375rem 0.625rem;
  border: none;
  border-radius: 0.5rem;
  background: transparent;
  color: var(--app-text);
  font-family: inherit;
  font-size: 0.8125rem;
  text-align: left;
  cursor: pointer;
  transition: background-color 120ms ease;
  white-space: nowrap;
  overflow: hidden;
}

.fm-sidebar-btn:hover  { background-color: var(--btn-hover); }
.fm-sidebar-btn.active { background-color: var(--btn-active); font-weight: 600; }
.fm-sidebar-btn:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 1px; }

.fm-sidebar-label { overflow: hidden; text-overflow: ellipsis; }

/* ── Main area ── */
.fm-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.fm-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 0.875rem 1rem 1.5rem;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
  scrollbar-width: thin;
}


/* ── Timeline groups ── */
.fm-group { margin-bottom: 0.5rem; }

.fm-group-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.25rem 0.5rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.fm-group-header::-webkit-details-marker { display: none; }
.fm-group-header:focus-visible { outline: 2px solid var(--focus-color); border-radius: 0.375rem; }

.fm-group-arrow {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  opacity: 0.55;
  transition: rotate 160ms ease;
}

.fm-group[open] .fm-group-arrow     { rotate: 0deg; }
.fm-group:not([open]) .fm-group-arrow { rotate: -90deg; }

.fm-group-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--topbar-text);
  opacity: 0.6;
}

.fm-group-count {
  font-size: 0.6875rem;
  opacity: 0.38;
  background: var(--btn-active);
  padding: 0.0625rem 0.375rem;
  border-radius: 1rem;
}

/* ── Tile grid ── */
.fm-tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 0.625rem;
  padding-bottom: 0.25rem;
}

.fm-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3125rem;
  padding: 0.875rem 0.5rem 0.6875rem;
  border-radius: 0.625rem;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  text-align: center;
  transition: background-color 120ms ease;
}

.fm-tile:hover { background-color: var(--btn-hover); }
.fm-tile:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 2px; }
.fm-tile-icon svg { width: 28px; height: 28px; }

.fm-tile-name {
  font-size: 0.6875rem;
  line-height: 1.3;
  color: var(--app-text);
  word-break: break-word;
  max-width: 100%;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.fm-tile-date { font-size: 0.625rem; opacity: 0.4; }

/* ── List rows ── */
.fm-list-rows {
  display: flex;
  flex-direction: column;
  gap: 0.0625rem;
  padding-bottom: 0.25rem;
}

.fm-list-header,
.fm-list-row {
  display: grid;
  grid-template-columns: 1.25rem 1fr 7rem 4.5rem;
  align-items: center;
  gap: 0.625rem;
  padding: 0.375rem 0.5rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
}

.fm-list-header {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  opacity: 0.45;
  padding-bottom: 0.25rem;
}

.fm-list-row { cursor: pointer; }
.fm-list-row:hover { background-color: var(--btn-hover); }
.fm-list-row:focus-visible { outline: 2px solid var(--focus-color); outline-offset: 1px; }

.fm-list-icon svg { width: 16px; height: 16px; }
.fm-list-name { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; color: var(--app-text); }
.fm-list-meta { font-size: 0.75rem; opacity: 0.5; white-space: nowrap; }
.fm-list-size { font-size: 0.75rem; opacity: 0.5; text-align: right; white-space: nowrap; }

@media (max-width: 640px) and (orientation: portrait) {
  .fm-list-header,
  .fm-list-row { grid-template-columns: 1.25rem 1fr 4.5rem; }
  .fm-list-meta { display: none; }
}

@container (width < 420px) {
  .fm-list-header,
  .fm-list-row { grid-template-columns: 1.25rem 1fr 4.5rem; }
  .fm-list-meta { display: none; }
}

/* ── Empty states ── */
.fm-empty-msg {
  margin: 2rem auto;
  text-align: center;
  opacity: 0.45;
  font-size: 0.875rem;
}

.fm-empty-small {
  margin: 0.75rem 0 0.5rem;
  font-size: 0.75rem;
}