/* Minimal, build-free design system for the Todo SPA.
   Light + dark via prefers-color-scheme; no framework, no build step. */
:root {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --fg: #1f2328;
  --muted: #656d76;
  --line: #d0d7de;
  --accent: #d1242f;      /* p1 / brand red */
  --accent-fg: #ffffff;
  --p2: #bc4c00;
  --p3: #0969da;
  --focus: #0969da;
  --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117; --surface: #161b22; --fg: #e6edf3; --muted: #8b949e;
    --line: #30363d; --accent: #f85149; --p2: #db6d28; --p3: #58a6ff; --focus: #58a6ff;
  }
}
/* Manual theme override (O1). The `html[data-theme=...]` selectors have higher
   specificity than the bare `:root` blocks above (including the one inside the
   media query), so an explicit user choice always wins over prefers-color-scheme.
   Set by app.js from localStorage; absent → follow the system preference above. */
html[data-theme="light"] {
  --bg: #ffffff; --surface: #f6f8fa; --fg: #1f2328; --muted: #656d76;
  --line: #d0d7de; --accent: #d1242f; --p2: #bc4c00; --p3: #0969da; --focus: #0969da;
}
html[data-theme="dark"] {
  --bg: #0d1117; --surface: #161b22; --fg: #e6edf3; --muted: #8b949e;
  --line: #30363d; --accent: #f85149; --p2: #db6d28; --p3: #58a6ff; --focus: #58a6ff;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.45;
}
.view { min-height: 100vh; }
[hidden] { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--accent); font-size: .85rem; margin: .25rem 0 0; }

a { color: var(--focus); }

button {
  font: inherit;
  padding: .55rem 1rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--fg);
  border-radius: var(--radius);
  cursor: pointer;
}
button:hover { border-color: var(--muted); }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
button.primary:hover { filter: brightness(1.05); }
button.ghost { background: transparent; }
input {
  font: inherit;
  padding: .55rem .7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  width: 100%;
}
input:focus, button:focus { outline: 2px solid var(--focus); outline-offset: 1px; }

.brand { font-size: 1.3rem; margin: 0; }

/* ---- Auth view ---- */
#auth-view { display: grid; place-items: center; padding: 1.5rem; }
.card {
  width: 100%; max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.75rem;
}
#auth-form { display: grid; gap: .85rem; margin-top: 1.25rem; }
#auth-form label { display: grid; gap: .3rem; font-size: .85rem; color: var(--muted); }
#auth-form button { margin-top: .35rem; }
.switch { margin-top: 1rem; font-size: .9rem; }

/* ---- App view ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: .85rem 1.25rem;
  border-bottom: 1px solid var(--line);
}
.topbar-right { display: flex; align-items: center; gap: .85rem; font-size: .9rem; }
#theme-toggle { padding: .35rem .55rem; line-height: 1; }
.search { flex: 1; display: flex; justify-content: center; margin: 0 1rem; }
.search input { width: 100%; max-width: 360px; }
.layout {
  display: grid; grid-template-columns: 220px 1fr;
  max-width: 960px; margin: 0 auto; gap: 1.5rem; padding: 1.5rem 1.25rem;
}
.sidebar nav { display: grid; gap: .15rem; position: sticky; top: 1rem; }
.nav-item {
  text-align: left; width: 100%; border: none; background: transparent;
  padding: .45rem .6rem; border-radius: 6px; color: var(--fg);
}
.nav-item:hover { background: var(--surface); }
.nav-item.active { background: var(--surface); font-weight: 600; }
.nav-item.nav-sub { padding-left: 1.4rem; font-size: .9rem; color: var(--muted); }
.nav-item.nav-sub.active { color: var(--fg); }
.nav-head { font-size: .72rem; text-transform: uppercase; letter-spacing: .05em;
            color: var(--muted); margin: .75rem .6rem .25rem; }

/* Favoritable entity rows (Q6): a nav button + a star toggle (projects/labels;
   filters add a delete). The star fades in on row hover, but stays visible when
   pinned so the Favorites section is self-explanatory. */
.nav-row { display: flex; align-items: center; }
.nav-row .nav-entity { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.nav-fav { padding: .2rem .4rem; border: none; background: transparent; border-radius: 6px;
           color: var(--muted); opacity: 0; line-height: 1; }
.nav-row:hover .nav-fav, .nav-filter-row:hover .nav-fav { opacity: 1; }
.nav-fav.on { opacity: 1; color: #f5b301; }
.nav-fav:hover { background: var(--surface); }
/* Inline edit (U8): a pencil affordance on hover, mirroring .nav-fav. */
.nav-edit { padding: .2rem .4rem; border: none; background: transparent; border-radius: 6px;
            color: var(--muted); opacity: 0; line-height: 1; }
.nav-row:hover .nav-edit { opacity: 1; }
.nav-edit:hover { background: var(--surface); color: var(--fg); }
.entity-edit-form .entity-del { color: var(--danger, #e44332); }

/* Saved filters (M5): a run button + inline delete, and a "New filter" form. */
.nav-filter-row { display: flex; align-items: center; }
.nav-filter-row .nav-filter { flex: 1; }
.nav-filter-del { padding: .2rem .4rem; color: var(--muted); border: none;
                  background: transparent; opacity: 0; border-radius: 6px; }
.nav-filter-row:hover .nav-filter-del { opacity: 1; }
.nav-filter-del:hover { background: var(--surface); color: var(--fg); }
.nav-newfilter { color: var(--muted); font-size: .85rem; }
.newfilter-form { display: grid; gap: .3rem; padding: .3rem .6rem .5rem; }
.newfilter-form input { width: 100%; box-sizing: border-box; }
.newfilter-form button { display: inline-block; margin-right: .3rem; }
.newfilter-error { margin: .2rem 0 0; }

/* Project/label color: a leading dot in the sidebar + a swatch picker in the
   "New project/label" form. Empty color → neutral default dot. */
.nav-dot { display: inline-block; width: .6rem; height: .6rem; border-radius: 50%;
           margin-right: .45rem; vertical-align: middle; background: var(--line);
           flex: none; }
.nav-newentity { color: var(--muted); font-size: .85rem; }
.newentity-form { display: grid; gap: .35rem; padding: .3rem .6rem .5rem; }
.newentity-form input { width: 100%; box-sizing: border-box; }
.newentity-form button:not(.swatch) { display: inline-block; margin-right: .3rem; }
.newentity-error { margin: .2rem 0 0; }
.swatch-row { display: flex; flex-wrap: wrap; gap: .3rem; }
.swatch { width: 1.1rem; height: 1.1rem; border-radius: 50%; padding: 0;
          border: 2px solid transparent; background: var(--line); cursor: pointer; }
.swatch.default { background: var(--line); position: relative; }
.swatch.on { border-color: var(--fg); }
.filter-error { color: var(--muted); padding: 1rem 0; list-style: none; }

.content { min-width: 0; }
.quick { display: flex; gap: .5rem; }
.quick input { flex: 1; }
.hint { color: var(--muted); font-size: .8rem; margin: .5rem 0 1rem; }
.hint code { background: var(--surface); padding: .05rem .3rem; border-radius: 4px; }
.list-title { font-size: 1rem; margin: 1rem 0 .5rem; }

.task-list { list-style: none; padding: 0; margin: 0; }
.task {
  display: flex; align-items: flex-start; flex-wrap: wrap; gap: .65rem;
  padding: .6rem .2rem .6rem .55rem; border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
}
/* Priority color-coding (Q3): p1 red, p2 orange, p3 blue as a left accent stripe;
   p4 (default) stays transparent. A completed task's stripe fades to muted. */
.task.prio-p1 { border-left-color: var(--accent); }
.task.prio-p2 { border-left-color: var(--p2); }
.task.prio-p3 { border-left-color: var(--p3); }
.task.done { border-left-color: var(--line); }
/* Keyboard-nav selection (Q5): the row the arrow keys are parked on. */
.task.selected { background: var(--surface); outline: 2px solid var(--focus); outline-offset: -2px; border-radius: 6px; }
.task-edit-form .edit-priority { flex: none; width: auto; }
/* Subtasks (K4): the nested list and the inline add-subtask form take a full row
   so they wrap below the parent's checkbox/title line; children are indented with
   a guide line. Collapse toggle + add-subtask buttons mirror the edit/del style. */
.task-toggle { border: none; background: transparent; color: var(--muted);
               padding: .1rem .3rem; margin-top: .1rem; flex: none; cursor: pointer; }
.task-toggle:hover { color: var(--accent); }
.task-addsub { border: none; background: transparent; color: var(--muted); padding: .1rem .4rem; }
.task-addsub:hover { color: var(--accent); }
.subtasks { flex-basis: 100%; list-style: none; margin: 0 0 0 1.1rem; padding: 0;
            border-left: 2px solid var(--line); }
.subtasks .task { border-bottom: none; padding-top: .35rem; padding-bottom: .35rem; padding-left: .6rem; }
.subtask-add-form { flex-basis: 100%; display: flex; gap: .4rem; margin: .3rem 0 0 1.7rem; }
.subtask-add-form input { flex: 1; }
.subtask-add-form button { flex: none; width: auto; padding: .3rem .7rem; }
.task input[type=checkbox] { width: auto; margin-top: .2rem; flex: none; }
/* Drag-and-drop reorder (Q2): draggable rows show a grab cursor; the row being
   dragged is dimmed so its live position in the list reads clearly. */
.task[draggable="true"] { cursor: grab; }
.task.dragging { opacity: .4; cursor: grabbing; }
/* Sidebar reorder (U3/U4): the nav button of a draggable row gets the grab
   cursor; the row being dragged is dimmed like a task row. */
.nav-row[draggable="true"] .nav-entity,
.nav-filter-row[draggable="true"] .nav-filter { cursor: grab; }
.nav-row.dragging, .nav-filter-row.dragging { opacity: .4; }
.task-main { flex: 1; min-width: 0; }
.task-title { display: block; }
.task.done .task-title { text-decoration: line-through; color: var(--muted); }
.task-desc {
  margin-top: .15rem; font-size: .8rem; color: var(--muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.task.done .task-desc { text-decoration: line-through; }
.task-meta { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .2rem; font-size: .75rem; }
.badge { padding: .05rem .4rem; border-radius: 4px; background: var(--surface); color: var(--muted); }
.badge.p1 { color: var(--accent-fg); background: var(--accent); }
.badge.p2 { color: var(--accent-fg); background: var(--p2); }
.badge.p3 { color: var(--accent-fg); background: var(--p3); }
.badge.due { }
.badge.due.overdue { color: var(--accent-fg); background: var(--danger, #d1453b); }
.task-reschedule { border: none; background: transparent; color: var(--accent);
                   font-size: .72rem; padding: 0 .3rem; cursor: pointer; }
.task-reschedule:hover { text-decoration: underline; }
.day-head { list-style: none; font-size: .8rem; font-weight: 600; color: var(--muted);
            margin: .8rem 0 .2rem; padding-top: .45rem; border-top: 1px solid var(--line); }
.badge.deadline::before { content: "⚑ "; }
.badge.deadline.overdue { color: var(--accent-fg); background: var(--danger, #d1453b); }
.badge.recur::before { content: "↻ "; }
/* Duration badge (K7): estimated task length; muted, the ⏱ prefix is in the text. */
.badge.duration { color: var(--muted); background: transparent; border: 1px solid var(--line); }
/* Label chips vs project badges look distinct (Q1: "projects look like labels").
   Labels are outlined blue with a leading #; projects are a filled surface pill
   with a leading dot — clearly two different kinds of tag at a glance. */
.badge.label { color: var(--p3); background: transparent; border: 1px solid var(--p3); }
.badge.label::before { content: "#"; }
.badge.project { color: var(--fg); background: var(--surface); border: 1px solid var(--line); }
.badge.project::before { content: "▪ "; }
.task-del, .task-edit { border: none; background: transparent; color: var(--muted); padding: .1rem .4rem; }
.task-del:hover, .task-edit:hover { color: var(--accent); }
/* Comments (K5b): toggle button + inline panel that wraps to a full row. */
.task-comments { border: none; background: transparent; color: var(--muted);
  padding: .1rem .4rem; font-size: .8rem; white-space: nowrap; }
.task-comments:hover { color: var(--accent); }
.task-comments.has-comments { color: var(--accent); }
.comments-panel { flex-basis: 100%; margin: .3rem 0 0 1.7rem; }
.comment-list { list-style: none; margin: 0 0 .5rem; padding: 0; display: grid; gap: .35rem; }
.comment { display: flex; align-items: baseline; gap: .5rem; font-size: .85rem; }
.comment-body { flex: 1; min-width: 0; overflow-wrap: anywhere; }
.comment-time { flex: none; color: var(--muted); font-size: .72rem; }
.comment-empty { color: var(--muted); font-size: .82rem; }
.comment-del { flex: none; border: none; background: transparent; color: var(--muted); padding: 0 .3rem; }
.comment-del:hover { color: var(--accent); }
.comment-add-form { display: flex; gap: .4rem; }
.comment-add-form input { flex: 1; }
.comment-add-form button { flex: none; width: auto; padding: .3rem .7rem; }
.task-edit-form { flex: 1; display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }
.task-edit-form .edit-title { flex: 1 1 12rem; }
.task-edit-form .edit-date,
.task-edit-form .edit-deadline { flex: none; width: auto; }
.task-edit-form .edit-duration { flex: none; width: 5rem; }
.task-edit-form .edit-notes { flex: 1 1 100%; resize: vertical; font: inherit; }
.task-edit-form button { flex: none; width: auto; padding: .3rem .7rem; }
.empty { padding: 1.5rem 0; }

/* Loading indicator (Q4): a small inline spinner shown while a view is fetching. */
.loading { padding: 1.5rem 0; }
.loading::after {
  content: ''; display: inline-block;
  width: 1rem; height: 1rem; margin-left: .5rem; vertical-align: middle;
  border: 2px solid var(--line); border-top-color: var(--focus);
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Toasts (Q4): stacked, transient notifications bottom-right; click to dismiss. */
.toast-region {
  position: fixed; bottom: 1rem; right: 1rem; z-index: 50;
  display: flex; flex-direction: column; gap: .5rem;
  max-width: min(90vw, 22rem); pointer-events: none;
}
.toast {
  pointer-events: auto; cursor: pointer;
  background: var(--fg); color: var(--bg);
  padding: .6rem .85rem; border-radius: var(--radius); font-size: .85rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .25);
  animation: toast-in .18s ease-out;
}
.toast.toast-error { background: var(--accent); color: var(--accent-fg); }
.toast.leaving { opacity: 0; transition: opacity .2s ease; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(.5rem); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .toast, .loading::after { animation: none; }
}

/* Account settings modal (O6): a centered card over a dimmed backdrop, wiring
   the O4 profile + change-password forms. */
.modal {
  position: fixed; inset: 0; z-index: 50;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  background: rgba(0, 0, 0, .45);
}
.modal-card {
  position: relative;
  width: 100%; max-width: 420px;
  max-height: 90vh; overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.75rem;
}
.modal-close { position: absolute; top: .6rem; right: .6rem; width: auto; padding: .3rem .55rem; line-height: 1; }
.account-form { display: grid; gap: .7rem; margin-top: 1rem; }
.account-form + .account-form { margin-top: 1.5rem; border-top: 1px solid var(--line); padding-top: 1.25rem; }
.account-form h3 { margin: 0; font-size: .95rem; }
.account-form label { display: grid; gap: .3rem; font-size: .85rem; color: var(--muted); }
.account-form button { margin-top: .35rem; width: auto; justify-self: start; padding: .45rem 1rem; }
.account-form label.checkbox { grid-auto-flow: column; grid-template-columns: auto 1fr; align-items: center; gap: .5rem; }
.account-form label.checkbox input { width: auto; justify-self: start; }
.success { color: #2da44e; font-size: .85rem; margin: .25rem 0 0; }

/* Keyboard-shortcuts help overlay (Q5): the `?` dialog's key/description list. */
.shortcut-list { display: grid; grid-template-columns: auto 1fr; gap: .5rem .9rem; margin: 1rem 0 0; align-items: center; }
.shortcut-list dt { margin: 0; }
.shortcut-list dd { margin: 0; font-size: .9rem; color: var(--muted); }
.shortcut-list kbd {
  display: inline-block; min-width: 1.4rem; text-align: center;
  padding: .15rem .45rem; font: inherit; font-size: .8rem;
  background: var(--bg); border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 5px; color: var(--fg);
}

/* Productivity / karma view (U2) */
.karma-hero {
  display: flex; align-items: baseline; gap: .5rem;
  padding: 1rem 1.1rem; margin-bottom: 1rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
}
.karma-score { font-size: 2.4rem; font-weight: 700; color: var(--accent); line-height: 1; }
.karma-score-label { font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.karma-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
.karma-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg); padding: .75rem .9rem;
}
.karma-card-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.karma-card-title { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.karma-value { font-size: 1.5rem; font-weight: 600; margin: .3rem 0; }
.karma-sub { font-size: .8rem; color: var(--muted); }
.karma-bar { height: 6px; border-radius: 3px; background: var(--surface); overflow: hidden; }
.karma-bar-fill { height: 100%; background: var(--p3, var(--focus)); transition: width .2s; }
.karma-bar-fill.met { background: #2da44e; }
.badge.karma-met { color: #fff; background: #2da44e; }
.karma-totals { margin-top: 1rem; font-size: .9rem; }

/* Calendar view (L6a-ui): a month grid of due-dated task chips. */
.cal-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .75rem; }
.cal-title { margin: 0; font-size: 1.1rem; }
.cal-nav { display: flex; gap: .3rem; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 1px; background: var(--line);
            border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.cal-weekday { background: var(--surface); color: var(--muted); font-size: .75rem; text-transform: uppercase;
               letter-spacing: .04em; text-align: center; padding: .4rem .2rem; }
.cal-cell { background: var(--bg); min-height: 5.5rem; padding: .3rem; display: flex; flex-direction: column; gap: .2rem; }
.cal-blank { background: var(--surface); }
.cal-today { outline: 2px solid var(--focus); outline-offset: -2px; }
.cal-daynum { font-size: .8rem; color: var(--muted); font-weight: 600; }
.cal-today .cal-daynum { color: var(--focus); }
.cal-chip { font-size: .75rem; padding: .1rem .3rem; border-radius: 4px; background: var(--surface);
            border-left: 3px solid var(--line); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cal-chip.prio-p1 { border-left-color: var(--accent); }
.cal-chip.prio-p2 { border-left-color: var(--p2); }
.cal-chip.prio-p3 { border-left-color: var(--p3); }
.cal-chip.done { text-decoration: line-through; color: var(--muted); }
.cal-chip[draggable="true"] { cursor: grab; }
.cal-chip.dragging { opacity: .4; cursor: grabbing; }
.cal-cell.cal-drop { outline: 2px dashed var(--focus); outline-offset: -2px; }

/* L5: List/Board layout toggle sits beside the view title. */
.list-header { display: flex; align-items: baseline; justify-content: space-between; gap: .5rem; }

/* Board / Kanban view (L5): the project's sections as horizontal columns. */
.board-cols { display: flex; gap: .75rem; overflow-x: auto; padding-bottom: .5rem; align-items: flex-start; }
.board-col { flex: 0 0 15rem; background: var(--surface); border: 1px solid var(--line);
             border-radius: var(--radius); display: flex; flex-direction: column; }
.board-col-head { font-weight: 600; font-size: .85rem; padding: .5rem .6rem; border-bottom: 1px solid var(--line); }
.board-col-body { padding: .5rem; display: flex; flex-direction: column; gap: .4rem; min-height: 3rem; }
.board-card { background: var(--bg); border: 1px solid var(--line); border-left: 3px solid var(--line);
              border-radius: 4px; padding: .35rem .5rem; font-size: .85rem; cursor: grab; }
.board-card.prio-p1 { border-left-color: var(--accent); }
.board-card.prio-p2 { border-left-color: var(--p2); }
.board-card.prio-p3 { border-left-color: var(--p3); }
.board-card.dragging { opacity: .4; cursor: grabbing; }
.board-card.done .board-card-title { text-decoration: line-through; opacity: .6; }
.board-card-title { overflow-wrap: anywhere; }
.board-card-meta { display: flex; flex-wrap: wrap; gap: .25rem; margin-top: .35rem; }
.board-col.board-drop { outline: 2px dashed var(--focus); outline-offset: -2px; }

@media (max-width: 640px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar nav { position: static; }
  .karma-grid { grid-template-columns: 1fr; }
  .cal-cell { min-height: 3.5rem; }
  .cal-chip { font-size: .65rem; }
}

/* App version + changelog link (fixed, unobtrusive, bottom-right). */
.app-footer {
  position: fixed;
  right: .6rem;
  bottom: .4rem;
  font-size: .72rem;
  z-index: 5;
  opacity: .55;
  transition: opacity .15s ease;
}
.app-footer:hover { opacity: 1; }
.app-footer a { color: var(--muted); text-decoration: none; }
.app-footer a:hover { color: var(--fg); text-decoration: underline; }