/* ============================================================
   Browser OS — shell, window manager and app styles
   ============================================================ */

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

button, input, textarea, select { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hidden { display: none !important; }

.os { position: fixed; inset: 0; }

/* ---------- wallpaper ---------- */
.wallpaper {
  position: absolute; inset: 0;
  background: var(--wallpaper);
  background-size: cover;
  background-position: center;
}
.wallpaper::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(120% 90% at 50% 0%, rgba(255,255,255,.07), transparent 60%);
  pointer-events: none;
}

/* ---------- desktop + icons ---------- */
.desktop { position: absolute; inset: 0 0 var(--taskbar-h) 0; overflow: hidden; outline: none; }

.desktop-icons {
  position: absolute; inset: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fill, 96px);
  grid-auto-rows: 92px;
  grid-auto-flow: column;
  gap: 4px;
  align-content: start;
}

.dicon {
  border: 0; background: transparent; color: var(--text);
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  padding: 8px 4px; border-radius: var(--radius-sm); cursor: default;
  user-select: none; -webkit-user-select: none;
}
.dicon:hover { background: var(--hover); }
.dicon.selected { background: var(--accent-soft); outline: 1px solid var(--accent); }
.dicon .glyph {
  width: 46px; height: 46px; display: grid; place-items: center;
  font-size: 26px; border-radius: 10px;
  background: linear-gradient(160deg, var(--surface-2), var(--surface-solid));
  border: 1px solid var(--border);
  box-shadow: 0 6px 16px rgba(0,0,0,.28);
}
.dicon .label {
  font-size: 12px; line-height: 1.25; text-align: center; max-width: 92px;
  text-shadow: 0 1px 3px rgba(0,0,0,.75);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
html[data-theme="light"] .dicon .label { text-shadow: 0 1px 2px rgba(255,255,255,.9); }

/* ---------- windows ---------- */
.windows-layer { position: absolute; inset: 0 0 var(--taskbar-h) 0; pointer-events: none; }

.window {
  position: absolute; pointer-events: auto;
  display: flex; flex-direction: column;
  min-width: 240px; min-height: 140px;
  background: var(--surface); backdrop-filter: blur(18px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-window);
  overflow: hidden;
  animation: win-in .16s cubic-bezier(.2,.9,.3,1);
  contain: layout paint;
}
@keyframes win-in { from { opacity: 0; transform: scale(.97) translateY(6px); } to { opacity: 1; transform: none; } }
.window.focused { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.window.minimized { display: none; }
.window.maximized { border-radius: 0; border-color: transparent; }
.window.closing { animation: win-out .12s ease forwards; }
@keyframes win-out { to { opacity: 0; transform: scale(.96); } }

.titlebar {
  height: var(--titlebar-h); flex: 0 0 auto;
  display: flex; align-items: center; gap: 8px;
  padding: 0 6px 0 10px;
  background: linear-gradient(180deg, var(--surface-2), transparent);
  border-bottom: 1px solid var(--border);
  cursor: move; touch-action: none; user-select: none;
}
.window:not(.focused) .titlebar { opacity: .72; }
.titlebar .wicon { font-size: 15px; }
.titlebar .wtitle {
  flex: 1; font-size: 13px; font-weight: 600; letter-spacing: .1px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.wcontrols { display: flex; gap: 2px; }
.wbtn {
  width: 26px; height: 24px; border: 0; border-radius: var(--radius-sm);
  background: transparent; color: var(--text-dim); cursor: pointer;
  display: grid; place-items: center; font-size: 13px;
}
.wbtn:hover { background: var(--hover); color: var(--text); }
.wbtn.close:hover { background: var(--danger); color: #fff; }

.wbody { flex: 1; min-height: 0; position: relative; overflow: auto; }
.window.maximized .wbody { border-radius: 0; }

.rz { position: absolute; z-index: 5; }
.rz-n { top: -3px; left: 8px; right: 8px; height: 7px; cursor: ns-resize; }
.rz-s { bottom: -3px; left: 8px; right: 8px; height: 7px; cursor: ns-resize; }
.rz-w { left: -3px; top: 8px; bottom: 8px; width: 7px; cursor: ew-resize; }
.rz-e { right: -3px; top: 8px; bottom: 8px; width: 7px; cursor: ew-resize; }
.rz-nw { left: -4px; top: -4px; width: 14px; height: 14px; cursor: nwse-resize; }
.rz-ne { right: -4px; top: -4px; width: 14px; height: 14px; cursor: nesw-resize; }
.rz-sw { left: -4px; bottom: -4px; width: 14px; height: 14px; cursor: nesw-resize; }
.rz-se { right: -4px; bottom: -4px; width: 14px; height: 14px; cursor: nwse-resize; }
.window.maximized .rz { display: none; }

.snap-preview {
  position: absolute; z-index: 99999; pointer-events: none;
  border: 2px solid var(--accent); border-radius: var(--radius);
  background: var(--accent-soft);
  transition: all .09s linear;
}

/* ---------- taskbar ---------- */
.taskbar {
  position: absolute; left: 0; right: 0; bottom: 0; height: var(--taskbar-h);
  display: flex; align-items: center; gap: 8px; padding: 0 8px;
  background: var(--surface); backdrop-filter: blur(20px) saturate(150%);
  border-top: 1px solid var(--border);
  z-index: 100000;
}
.start-btn {
  display: flex; align-items: center; gap: 8px;
  height: 34px; padding: 0 12px; border-radius: var(--radius-sm);
  border: 1px solid transparent; background: transparent; color: var(--text);
  cursor: pointer; font-weight: 600; font-size: 13px;
}
.start-btn:hover, .start-btn.open { background: var(--accent-soft); border-color: var(--accent); }
.start-logo {
  width: 18px; height: 18px; border-radius: 5px;
  background: conic-gradient(from 20deg, var(--accent), var(--accent-2), var(--accent));
  box-shadow: 0 0 12px var(--accent-soft);
}
.taskbar-items { flex: 1; display: flex; gap: 4px; overflow: hidden; }
.titem {
  display: flex; align-items: center; gap: 7px; max-width: 220px;
  height: 34px; padding: 0 10px; border-radius: var(--radius-sm);
  border: 1px solid transparent; background: var(--hover); color: var(--text);
  cursor: pointer; font-size: 12.5px;
}
.titem:hover { background: var(--active); }
.titem.focused { background: var(--accent-soft); border-color: var(--accent); }
.titem.minimized { opacity: .6; }
.titem .glyph { font-size: 15px; }
.titem .t { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.tray { display: flex; align-items: center; gap: 10px; padding-right: 6px; }
.tray-status { font-size: 12px; color: var(--text-dim); }
.tray-btn {
  width: 30px; height: 30px; border-radius: 7px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text-dim);
  display: grid; place-items: center; font-size: 13px;
}
.tray-btn:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.clock { font-size: 12.5px; text-align: right; line-height: 1.15; cursor: default; }
.clock .time { font-variant-numeric: tabular-nums; font-weight: 600; }
.clock .date { color: var(--text-dim); font-size: 11px; }

/* ---------- start menu ---------- */
.start-menu {
  position: absolute; left: 8px; bottom: calc(var(--taskbar-h) + 8px);
  width: 420px; max-width: calc(100vw - 16px); max-height: min(560px, calc(100vh - var(--taskbar-h) - 24px));
  background: var(--surface); backdrop-filter: blur(24px) saturate(150%);
  border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow-pop);
  z-index: 100001; display: flex; flex-direction: column; overflow: hidden;
  animation: pop-in .14s cubic-bezier(.2,.9,.3,1);
}
@keyframes pop-in { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: none; } }
.start-search { padding: 12px; border-bottom: 1px solid var(--border); }
.start-search input {
  width: 100%; height: 34px; padding: 0 12px; border-radius: 8px;
  background: var(--surface-2); border: 1px solid var(--border); outline: none;
}
.start-search input:focus { border-color: var(--accent); }
.start-body { overflow: auto; padding: 10px 12px 14px; }
.start-section { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-faint); margin: 8px 2px 6px; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 6px; }
.app-tile {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 10px 6px; border: 1px solid transparent; border-radius: 10px;
  background: transparent; cursor: pointer; color: var(--text);
}
.app-tile:hover { background: var(--hover); border-color: var(--border); }
.app-tile .glyph { font-size: 24px; }
.app-tile .name { font-size: 12px; }
.start-footer { padding: 8px 12px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text-dim); }
.linkbtn { background: none; border: 0; color: var(--accent); cursor: pointer; font-size: 12px; padding: 4px 6px; border-radius: 6px; }
.linkbtn:hover { background: var(--accent-soft); }

/* ---------- context menu ---------- */
.context-menu {
  position: absolute; z-index: 100002; min-width: 210px;
  background: var(--surface); backdrop-filter: blur(20px) saturate(150%);
  border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow-pop);
  padding: 6px; animation: pop-in .1s ease;
}
.cmenu-item {
  width: 100%; text-align: left; display: flex; gap: 10px; align-items: center;
  padding: 8px 10px; border: 0; background: transparent; color: var(--text);
  border-radius: 7px; cursor: pointer; font-size: 13px;
}
.cmenu-item:hover { background: var(--accent-soft); }
.cmenu-item .glyph { width: 18px; text-align: center; }
.cmenu-sep { height: 1px; background: var(--border); margin: 5px 4px; }
.cmenu-hint { font-size: 11px; color: var(--text-faint); margin-left: auto; }

/* ---------- toasts ---------- */
.toasts { position: absolute; right: 12px; bottom: calc(var(--taskbar-h) + 12px); display: flex; flex-direction: column; gap: 8px; z-index: 100003; }
.toast {
  min-width: 220px; max-width: 340px; padding: 10px 12px;
  background: var(--surface); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 10px; box-shadow: var(--shadow-pop); font-size: 13px;
  animation: pop-in .16s ease;
}
.toast.err { border-left-color: var(--danger); }
.toast.ok { border-left-color: var(--ok); }
.toast .t { font-weight: 600; margin-bottom: 2px; }
.toast .d { color: var(--text-dim); font-size: 12px; }

/* ---------- shared app UI ---------- */
.app { height: 100%; display: flex; flex-direction: column; background: var(--surface-solid); }
.toolbar {
  display: flex; align-items: center; gap: 6px; padding: 7px 9px; flex: 0 0 auto;
  flex-wrap: nowrap; border-bottom: 1px solid var(--border); background: var(--surface-2);
  /* Narrow windows scroll the toolbar instead of silently cutting buttons off. */
  overflow: auto hidden; scrollbar-width: none; overscroll-behavior-x: contain;
}
.toolbar::-webkit-scrollbar { height: 0; }
.toolbar .spacer { flex: 1 1 8px; min-width: 4px; }
.btn {
  height: 28px; padding: 0 10px; border-radius: 7px; cursor: pointer; flex: 0 0 auto;
  white-space: nowrap; border: 1px solid var(--border); background: var(--surface-3); color: var(--text); font-size: 12.5px;
}
.btn:hover { background: var(--active); }
.btn.primary { background: var(--accent); border-color: transparent; color: #fff; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.danger { background: var(--danger); border-color: transparent; color: #fff; }
.field {
  height: 28px; padding: 0 9px; border-radius: 7px; min-width: 0;
  background: var(--surface-solid); border: 1px solid var(--border); outline: none;
}
.field:focus { border-color: var(--accent); }
.statusbar {
  flex: 0 0 auto; display: flex; gap: 14px; align-items: center;
  padding: 5px 10px; font-size: 11.5px; color: var(--text-dim);
  border-top: 1px solid var(--border); background: var(--surface-2);
}
.pad { padding: 14px; }
.muted { color: var(--text-dim); }
.mono { font-family: var(--mono); }

/* ---------- terminal ---------- */
.term { height: 100%; display: flex; flex-direction: column; background: #080c16; }
html[data-theme="light"] .term { background: #0f172a; }
.term-out {
  flex: 1; overflow: auto; padding: 10px 12px;
  font-family: var(--mono); font-size: 13px; line-height: 1.5; white-space: pre-wrap; word-break: break-word;
}
.term-out .err { color: var(--danger); }
.term-out .dim { color: var(--text-faint); }
.term-out .acc { color: var(--accent); }
.term-out .ok { color: var(--ok); }
.term-out a { color: var(--accent); }
.term-out .neof { color: var(--accent); font-weight: 600; }
.term-row { flex: 0 0 auto; display: flex; gap: 8px; align-items: center; padding: 8px 12px; border-top: 1px solid var(--border); background: rgba(255,255,255,.03); }
.term-cwd { font-family: var(--mono); font-size: 12.5px; color: var(--accent); white-space: nowrap; }
.term-input { flex: 1; background: transparent; border: 0; outline: none; font-family: var(--mono); font-size: 13px; }
.term-input::placeholder { color: var(--text-faint); }

/* ---------- files ---------- */
.files { flex-direction: row; }
.files-side { width: 172px; flex: 0 0 auto; border-right: 1px solid var(--border); background: var(--surface-2); padding: 8px; overflow: auto; }
.side-item {
  width: 100%; display: flex; gap: 8px; align-items: center; padding: 7px 8px;
  border: 0; background: transparent; color: var(--text); border-radius: 7px; cursor: pointer; font-size: 12.5px; text-align: left;
}
.side-item:hover { background: var(--hover); }
.side-item.active { background: var(--accent-soft); color: var(--accent); }
.files-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.crumbs { display: flex; gap: 2px; align-items: center; font-size: 12px; color: var(--text-dim); flex: 0 0 auto; }
.crumbs button { background: none; border: 0; color: var(--text); cursor: pointer; padding: 4px 6px; border-radius: 5px; font-size: 12px; white-space: nowrap; }
.crumbs button:last-child { text-overflow: ellipsis; overflow: hidden; white-space: nowrap; max-width: 160px; }
.crumbs button:hover { background: var(--hover); }
.filegrid {
  flex: 1; overflow: auto; align-content: start;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 6px; padding: 12px;
}
.filecell {
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 10px 6px;
  border: 1px solid transparent; border-radius: 9px; cursor: default; background: transparent; color: var(--text);
}
.filecell:hover { background: var(--hover); border-color: var(--border); }
.filecell.selected { background: var(--accent-soft); border-color: var(--accent); }
.filecell .glyph { font-size: 28px; }
.filecell .name { font-size: 11.5px; text-align: center; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.filecell .meta { font-size: 10px; color: var(--text-faint); }
.empty-state { padding: 28px; text-align: center; color: var(--text-faint); font-size: 13px; }

/* ---------- editor ---------- */
.editor-area {
  flex: 1; min-height: 0; width: 100%; resize: none; border: 0; outline: none;
  padding: 14px 16px; background: var(--surface-solid); color: var(--text);
  font-family: var(--mono); font-size: 13.5px; line-height: 1.6; tab-size: 2;
}

/* ---------- viewer ---------- */
.viewer-main { flex: 1; min-height: 0; display: grid; place-items: center; padding: 14px; overflow: auto; background:
  repeating-conic-gradient(var(--surface-2) 0% 25%, var(--surface-solid) 0% 50%) 50% / 22px 22px; }
.viewer-main img { max-width: 100%; max-height: 100%; border-radius: 8px; box-shadow: var(--shadow-pop); }
.viewer-text { align-items: stretch; justify-content: stretch; display: block; overflow: auto; background: var(--surface-solid); padding: 16px; font-family: var(--mono); font-size: 13px; white-space: pre-wrap; }

/* ---------- paint ---------- */
.paint-main { flex: 1; min-height: 0; position: relative; overflow: hidden; }
.paint-canvas { position: absolute; inset: 0; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }
.swatch { width: 26px; height: 26px; border-radius: 6px; border: 1px solid var(--border); padding: 0; background: transparent; cursor: pointer; flex: 0 0 auto; }
.swatch.active { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
input[type="color"].swatch { padding: 0; }
input[type="color"].swatch::-webkit-color-swatch-wrapper { padding: 3px; }
input[type="color"].swatch::-webkit-color-swatch { border: none; border-radius: 4px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.seg button { border: 0; background: transparent; color: var(--text-dim); padding: 5px 10px; cursor: pointer; font-size: 12.5px; }
.seg button.active { background: var(--accent); color: #fff; }

/* ---------- calculator ---------- */
.calc { max-width: 340px; margin: 0 auto; width: 100%; }
.calc-display {
  margin: 12px; padding: 14px; border-radius: 10px; background: var(--surface-2);
  border: 1px solid var(--border); text-align: right; font-family: var(--mono);
}
.calc-display .expr { font-size: 12px; color: var(--text-faint); min-height: 16px; }
.calc-display .val { font-size: 28px; font-weight: 600; word-break: break-all; }
.calc-pad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; padding: 0 12px 12px; }
.calc-key {
  height: 52px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface-3); color: var(--text); font-size: 17px; cursor: pointer;
}
.calc-key:hover { background: var(--active); }
.calc-key.op { background: var(--accent-soft); color: var(--accent); }
.calc-key.eq { background: var(--accent); color: #fff; border-color: transparent; font-weight: 700; }

/* ---------- settings ---------- */
.settings-main { flex: 1; overflow: auto; padding: 16px; }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 14px; margin-bottom: 14px; background: var(--surface-2); }
.card h3 { margin: 0 0 4px; font-size: 14px; }
.card p { margin: 0 0 12px; color: var(--text-dim); font-size: 12.5px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.wp-tile {
  width: 104px; height: 64px; border-radius: 9px; border: 2px solid var(--border); cursor: pointer;
  background-size: cover; background-position: center;
}
.wp-tile.active { border-color: var(--accent); }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 4px 10px; font-size: 12.5px; }
.kv .k { color: var(--text-dim); }

/* ---------- web ---------- */
.web-main { flex: 1; min-height: 0; border: 0; width: 100%; background: #fff; }

/* ---------- welcome ---------- */
.welcome { padding: 18px 20px; overflow: auto; }
.welcome h1 { margin: 0 0 4px; font-size: 20px; }
.welcome .sub { color: var(--text-dim); margin-bottom: 12px; font-size: 12.5px; }
.welcome ul { margin: 0 0 14px; padding-left: 18px; font-size: 12.5px; line-height: 1.55; }
.welcome code { font-family: var(--mono); background: var(--surface-2); padding: 1px 5px; border-radius: 4px; font-size: 12px; }
.welcome .cta { display: flex; gap: 8px; flex-wrap: wrap; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 8px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }
::-webkit-scrollbar-track { background: transparent; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

@media (max-width: 720px) {
  .files-side { width: 128px; }
  .start-menu { width: calc(100vw - 16px); }
  .start-label { display: none; }
}