/* Design tokens, reset, typography and the app shell (shared). */
:root {
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;

  /* ink */
  --ink: #141517;          /* to-do titles */
  --ink-2: #2b2d30;        /* notes, body copy */
  --ink-3: #25292e;        /* large titles, section headings */
  --grey: #82878d;         /* subtitles */
  --grey-2: #9a9ca0;       /* counts, quiet text */
  --grey-3: #a7a9ac;       /* quiet icons */
  --grey-4: #c0c3c6;       /* checkbox stroke */
  --done: #8f9398;         /* completed titles */

  /* lines and fills */
  --line: #e4e5e8;         /* section rules */
  --line-2: #ececee;       /* hairlines */
  --fill: #e9eaec;         /* date badges */
  --pill: #b0b3b6;         /* selected filter pill */

  /* colour */
  --blue: #1b5fbf;         /* headings, pies, checklist */
  --blue-2: #4a80cc;       /* heading dots */
  --accent: #5d9cf5;       /* floating +, highlights */
  --check: #4b8ff0;        /* completed checkbox */
  --sel: #d9e6fb;          /* selected row */
  --red: #fa1955;          /* due today */
  --badge: #fe4b75;        /* sidebar due badge */
  --yellow: #f7c61c;       /* today star */
  --moon: #7396c8;         /* this evening */

  /* surfaces */
  --bg: #ffffff;
  --bg-dim: #fafafa;       /* content behind an open card */
  --sidebar: #f6f6f8;
  --sidebar-sel: #e3e4e7;
  --dark: #2b323b;         /* when popover */

  --sidebar-w: 222px;
  --col-max: 600px;
  --col-pad-l: 44px;
  --col-pad-r: 36px;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font: 14px/1.3 var(--font);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; margin: 0; cursor: default; }
input, textarea { border: 0; outline: 0; background: transparent; padding: 0; margin: 0; }
textarea { resize: none; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0; }
svg { display: block; flex: none; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid rgba(93, 156, 245, .55); outline-offset: 1px; }
input:focus-visible, textarea:focus-visible, [contenteditable]:focus-visible { outline: 0; }

/* ---------- shell ---------- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
}
.content {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg);
  transition: background-color .18s ease;
}
.content.dim { background: var(--bg-dim); }
.scroller {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  scroll-padding: 60px 0 80px;
}
.column {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: var(--col-max);
  min-height: 100%;
  margin: 0 auto;
}
/* side margins live inside the header and list-body so each includes its gutter */
.list-header { padding-left: var(--col-pad-l); padding-right: var(--col-pad-r); }
.list-body { flex: 1 0 auto; padding: 0 var(--col-pad-r) 72px var(--col-pad-l); }
.topbar { display: none; }

/* TodoMVC's toggle-all stays in the DOM for the "Complete All" commands (label in menus/toolbar).
   It is invisible but stays the topmost element at its own 1px spot (the list's top-left corner), so a
   real pointer click on it toggles it, as the TodoMVC and repeat checks do. On touch screens it takes
   no taps, so a finger near that corner can't be snapped onto it. */
.toggle-all {
  position: absolute;
  top: 0; left: 0;
  z-index: 5;
  width: 1px; height: 1px;
  opacity: 0;
  margin: 0;
}
@media (hover: none) and (pointer: coarse) { .toggle-all { pointer-events: none; } }
.main { position: relative; }

/* empty list: a large quiet version of the list icon, like Things */
.empty-state {
  display: none;
  justify-content: center;
  padding: 90px 0 40px;
  opacity: .16;
  filter: grayscale(1);
  pointer-events: none;
}
.empty-state.show { display: flex; }
.empty-state svg { width: 84px; height: 84px; }

/* ---------- desktop toolbar ---------- */
.toolbar {
  flex: none;
  position: relative;
  height: 46px;
  border-top: 1px solid var(--line-2);
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 0 16px;
  z-index: 2;
}
.toolbar .tools {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  flex: 1;
  max-width: 520px;
  margin: 0 104px 0 96px;
}
.tool {
  width: 36px; height: 30px;
  display: grid; place-items: center;
  border-radius: 6px;
  color: #6b7076;
}
.tool:hover { background: #f1f1f3; }
.tool:active { background: #e8e8eb; }
.tool[disabled], .tool.off { color: #c9cbcf; background: none; }
.tool svg { width: 17px; height: 17px; }

.footer {
  position: absolute;
  left: 18px; right: 18px; top: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
  font-size: 12px;
  color: var(--grey-2);
}
.footer > * { pointer-events: auto; }
.footer .todo-count { font-variant-numeric: tabular-nums; }
.footer .clear-completed {
  font-size: 12px;
  color: var(--grey-2);
  padding: 4px 6px;
  border-radius: 5px;
}
.footer .clear-completed:hover { color: var(--ink-2); background: #f1f1f3; }

/* ---------- popover layer + menus (shared) ---------- */
.layer { position: fixed; inset: 0; pointer-events: none; z-index: 50; }
.layer > * { pointer-events: auto; }
.scrim { position: fixed; inset: 0; background: transparent; }
.scrim.dark { background: rgba(0, 0, 0, .22); }

.menu {
  position: fixed;
  min-width: 190px;
  padding: 5px;
  background: rgba(246, 246, 248, .98);
  border: 1px solid rgba(0, 0, 0, .12);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .16), 0 1px 3px rgba(0, 0, 0, .08);
  font-size: 13px;
  color: var(--ink);
  animation: pop .12s ease-out;
}
.menu-item {
  display: flex; align-items: center; gap: 8px;
  width: 100%;
  height: 24px;
  padding: 0 9px;
  border-radius: 5px;
  text-align: left;
  white-space: nowrap;
}
.menu-item:hover, .menu-item.active { background: var(--accent); color: #fff; }
.menu-item svg { width: 14px; height: 14px; }
.menu-sep { height: 1px; background: rgba(0, 0, 0, .09); margin: 5px 8px; }

@keyframes pop { from { opacity: 0; transform: scale(.97); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* ---------- mid widths: keep the desktop shell, slimmer ---------- */
@media (max-width: 1060px) {
  :root { --sidebar-w: 212px; --col-pad-l: 40px; --col-pad-r: 32px; }
}

/* ---------- phone ---------- */
@media (max-width: 699px) {
  :root { --col-pad-l: 19px; --col-pad-r: 16px; }
  body { font-size: 17px; }
  .app { display: block; height: 100vh; height: 100dvh; position: relative; }
  .content { position: absolute; inset: 0; }
  .app.at-lists .content { display: none; }
  .app:not(.at-lists) .sidebar { display: none; }
  .list-header { padding-left: calc(var(--col-pad-l) + var(--safe-l)); padding-right: calc(var(--col-pad-r) + var(--safe-r)); }
  .list-body { padding-bottom: calc(110px + var(--safe-b)); padding-left: calc(var(--col-pad-l) + var(--safe-l)); padding-right: calc(var(--col-pad-r) + var(--safe-r)); }
  .toolbar { display: none; }
  .topbar {
    display: flex;
    flex: none;
    align-items: center;
    justify-content: space-between;
    height: calc(44px + var(--safe-t));
    padding: var(--safe-t) calc(10px + var(--safe-r)) 0 calc(8px + var(--safe-l));
    background: var(--bg);
    position: relative;
    z-index: 3;
  }
  .topbar .tb-btn {
    width: 40px; height: 40px;
    display: grid; place-items: center;
    color: #8e95a0;
    border-radius: 20px;
  }
  .topbar .tb-btn:active { background: #f0f1f3; }
  .topbar .tb-right { display: flex; align-items: center; gap: 2px; }
  .topbar .tb-search svg { width: 19px; height: 19px; }
  .topbar .tb-more { width: 44px; }
  .topbar .tb-title {
    position: absolute; left: 60px; right: 60px; top: var(--safe-t); height: 44px;
    display: flex; align-items: center; justify-content: center; gap: 6px;
    font-size: 16px; font-weight: 600; color: var(--ink-3);
    opacity: 0; transition: opacity .15s;
    pointer-events: none;
  }
  .topbar.scrolled .tb-title { opacity: 1; }
  .topbar.scrolled { box-shadow: 0 1px 0 var(--line-2); }
  .topbar .tb-title svg { width: 18px; height: 18px; }
  .footer {
    position: static;
    justify-content: center;
    gap: 14px;
    margin: 26px 0 0;
    font-size: 13px;
    color: #b0b3b8;
  }
  .footer .todo-count { display: none; }
  .footer .clear-completed { font-size: 13px; color: #9a9ea4; }
  .empty-state { padding-top: 120px; }
  .menu { font-size: 16px; min-width: 220px; border-radius: 12px; }
  .menu-item { height: 40px; padding: 0 12px; }
}