:root {
  --bg: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --card: #ffffff;
  --soft: #f1f5f9;
  --side: #f8fafc;
  --blue: #2563eb;
  --blue-soft: #eff6ff;
  --late: #dc2626;
  --today: #1d4ed8;
  --page: #e7eef8;
  --sans: "IBM Plex Sans", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0b1220;
  --ink: #e8eef7;
  --muted: #94a3b8;
  --line: #1e293b;
  --card: #0f172a;
  --soft: #1e293b;
  --side: #0b1220;
  --blue: #60a5fa;
  --blue-soft: #172554;
  --late: #fca5a5;
  --today: #93c5fd;
  --page: #020617;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--page);
}

.frame {
  width: min(1120px, 100%);
  margin: 0 auto;
  min-height: 100vh;
  min-width: 0;
  background: var(--bg);
  box-shadow: 0 0 0 1px var(--line);
}

::selection { background: #bfdbfe; color: #0f172a; }

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

button { cursor: pointer; }

h1, h2, p { margin: 0; }

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  background: var(--blue);
  color: #fff;
  padding: 8px 12px;
  border-radius: 6px;
  z-index: 40;
}

.skip:focus { top: 12px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: inherit;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.mark {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--blue);
  display: block;
}

.today { color: var(--muted); font-size: 13px; white-space: nowrap; }

.views {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  background: var(--card);
}

.view-btn, .btn {
  border: 1px solid transparent;
  background: transparent;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  line-height: 1.2;
}

.view-btn { border-radius: 0; }

.view-btn[aria-pressed="true"] {
  background: var(--blue);
  color: #fff;
}

.btn { border-color: var(--line); background: var(--card); }

.btn.primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.search { margin-left: auto; }

.search input, textarea, dialog input, dialog select {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 6px;
  padding: 7px 10px;
}

.search input { width: 180px; }

.check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.shell {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr) 312px;
  align-items: start;
  min-height: calc(100vh - 56px);
}

.side {
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
  overflow: auto;
  padding: 16px;
  background: var(--side);
  border-right: 1px solid var(--line);
}

.content { padding: 16px 16px 48px; min-width: 0; }

.side, .cal, .content { min-width: 0; }

.cal {
  position: sticky;
  top: 56px;
  height: calc(100vh - 56px);
  overflow: auto;
  padding: 16px;
  border-left: 1px solid var(--line);
  background: var(--side);
}

.cal-card, .cal-detail {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.cal-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.cal-nav strong { font-size: 14px; font-weight: 600; }

.cal-nav button, .cal-detail button {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 6px;
  min-width: 28px;
  height: 28px;
  padding: 0 8px;
  font-size: 13px;
}

.cal-week {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
}

.cal-dows, .cal-grid {
  display: grid;
  grid-template-columns: 34px repeat(7, 1fr);
  gap: 2px;
  text-align: center;
}

.cal-wk {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: -0.03em;
}

button.cal-wk {
  border: none;
  background: transparent;
  border-radius: 6px;
  padding: 0;
}

.cal-grid button.cal-wk.is-now:not(.is-on) { color: var(--blue); }

.cal-dows span {
  color: var(--muted);
  font-size: 12px;
  padding: 4px 0;
}

.cal-grid button {
  position: relative;
  height: 34px;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 13px;
  color: inherit;
  padding: 0;
}

.cal-grid button.cal-wk {
  font-size: 10px;
  color: var(--muted);
}

.cal-grid button.is-week { background: var(--soft); }

.cal-grid button.is-today { box-shadow: inset 0 0 0 1.5px var(--blue); }

.cal-grid button.is-picked { background: var(--blue-soft); color: var(--blue); }

.cal-grid button.is-on,
.cal-grid button.is-on.is-week,
.cal-grid button.is-on.is-today,
.cal-grid button.is-on.is-picked {
  background: var(--blue);
  color: #fff;
  box-shadow: none;
}

.cal-grid button.has::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue);
  transform: translateX(-50%);
}

.cal-grid button.is-on.has::after { background: #fff; }

.cal-detail { margin-top: 12px; }

.cal-detail p { font-size: 13px; font-weight: 600; }

.cal-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.cal-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.cal-list li.is-done span:last-child {
  color: var(--muted);
  text-decoration: line-through;
}

.cal-actions { display: flex; gap: 8px; margin-top: 10px; }

.cal-nav .cal-actions { margin-top: 0; }

.cal-hint { color: var(--muted); font-size: 12px; font-weight: 400; margin-top: 8px; }

.next {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.next-kicker { color: var(--muted); font-size: 12px; }

.next-num {
  margin-top: 4px;
  font-size: 32px;
  font-weight: 600;
  line-height: 1;
  color: var(--blue);
  letter-spacing: -0.03em;
}

.next-num span {
  margin-left: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0;
}

.next-date { margin-top: 6px; color: var(--muted); font-size: 13px; }

.next ul { list-style: none; margin: 10px 0 0; padding: 0; }

.next li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.season { margin-top: 14px; }

.season-top {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}

.track {
  position: relative;
  height: 3px;
  margin-top: 8px;
  background: var(--line);
  border-radius: 99px;
}

.track > span {
  position: absolute;
  top: -2px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  transform: translateX(-50%);
}

.side-label {
  margin: 16px 0 6px;
  color: var(--muted);
  font-size: 12px;
}

.chips, .rail, #rush .rush-row { display: flex; flex-direction: column; gap: 2px; }

.chip, .rail button, #rush button {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  width: 100%;
  border: none;
  background: transparent;
  border-radius: 6px;
  padding: 6px 8px;
  text-align: left;
  font-size: 13px;
  color: inherit;
}

.chip[aria-pressed="true"], .rail button.is-now {
  background: var(--blue-soft);
  color: var(--blue);
}

.chip-name {
  flex: 1 0 100%;
  min-width: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
  white-space: normal;
}

.chip[aria-pressed="true"] .chip-name { color: var(--blue); }

.rail button, #rush button { justify-content: space-between; }

.rail .wk { font-weight: 600; }

.rail .sub, #rush .s { color: var(--muted); font-size: 12px; }

.rail button.is-now .sub { color: var(--blue); }

.badge {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 6px;
  border-radius: 4px;
  background: var(--blue-soft);
  color: var(--c, var(--blue));
  font-size: 11px;
  font-weight: 600;
  flex: none;
}

.list-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  min-height: 28px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
}

#filterNote { display: flex; align-items: center; gap: 8px; }

#filterNote[hidden] { display: none; }

#list {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.divider {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 14px 12px;
  background: var(--blue-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  scroll-margin-top: 72px;
}

.divider .wk { font-size: 22px; font-weight: 700; line-height: 1; letter-spacing: -0.03em; }

.divider .range { color: var(--muted); font-weight: 500; font-size: 13px; }

.tag {
  font-size: 11px;
  font-weight: 600;
  color: var(--blue);
  background: var(--blue-soft);
  border-radius: 4px;
  padding: 1px 6px;
}

.day {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  scroll-margin-top: 72px;
}

.day-label { padding: 12px 0 8px 14px; }

.day-label .n { display: block; font-weight: 600; font-size: 13px; }

.day-meta { display: block; color: var(--muted); font-size: 12px; }

.item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 4px 10px;
  align-items: center;
  padding: 8px 12px;
  border-top: 1px solid var(--line);
}

.item-tools, .item-end { display: flex; align-items: center; gap: 2px; }

.tick {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
}

.tick input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--blue);
}

.icon-btn {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
  padding: 0;
}

.icon-btn.is-on,
.icon-btn[aria-expanded="true"] { color: var(--blue); background: var(--blue-soft); }

.note-btn {
  width: 26px;
  height: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink);
}

.note-btn.is-on,
.note-btn[aria-expanded="true"] {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-soft);
}

.icon-btn.is-danger { color: var(--late); }

.item-main {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.item-title {
  border: none;
  background: none;
  padding: 0;
  font-size: 14px;
  font-weight: 600;
  text-align: left;
}

.pill {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 7px;
  border-radius: 99px;
  background: var(--soft);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  flex: none;
}

.meta {
  color: var(--muted);
  font-size: 13px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.when {
  color: var(--muted);
  font-size: 12px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.when.is-today { color: var(--today); font-weight: 600; }

.when.is-late { color: var(--late); font-weight: 600; }

.item-actions { display: flex; gap: 8px; justify-content: flex-end; }

.mini {
  border: none;
  background: none;
  color: var(--blue);
  font-size: 12px;
  padding: 0;
}

.item.is-done .item-title {
  text-decoration: line-through;
  color: var(--muted);
}

.note, .note-preview { grid-column: 1 / -1; }

.note-preview {
  color: var(--muted);
  font-size: 13px;
  white-space: pre-wrap;
}

textarea {
  min-height: 72px;
  resize: vertical;
  background: var(--side);
}

.quiet, .empty { color: var(--muted); padding: 12px 14px 16px; }

.chapter, .course { scroll-margin-top: 72px; }

.course-h {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 14px 0;
}

.course-h h2 { display: flex; align-items: center; gap: 8px; min-width: 0; font-size: 15px; font-weight: 600; }

.course-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.course-add { display: grid; gap: 6px; margin-top: 8px; }

.course-add-row { display: flex; align-items: center; gap: 6px; }

.course-add input[type="text"] {
  flex: 1;
  min-width: 0;
  width: 100%;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 6px;
  padding: 6px 8px;
}

.course-row { display: flex; align-items: center; gap: 4px; }

.course-row .chip { flex: 1; width: auto; min-width: 0; }

.swatch {
  display: inline-flex;
  flex: none;
}

input[type="color"] {
  width: 22px;
  height: 22px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
}

#courseRestore { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }

.course-h .count {
  margin-left: auto;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
}

.course .next { color: var(--muted); font-size: 13px; padding: 4px 14px 0; }

.progress {
  height: 3px;
  margin: 8px 14px 0;
  background: var(--line);
  border-radius: 99px;
  overflow: hidden;
}

.progress > span { display: block; height: 100%; background: var(--blue); }

.foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: end;
  flex-wrap: wrap;
  margin-top: 20px;
  color: var(--muted);
  font-size: 12px;
}

.foot p + p { margin-top: 2px; }

.foot-actions { display: flex; gap: 8px; }

dialog {
  border: 1px solid var(--line);
  padding: 18px;
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  width: min(440px, calc(100vw - 32px));
  max-height: min(90vh, 720px);
  overflow: auto;
}

dialog::backdrop { background: rgba(15, 23, 42, 0.4); }

dialog h2 { font-size: 18px; font-weight: 600; }

.dialog-h, .dialog-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

dialog label { display: block; margin-top: 12px; }

dialog label span,
.field-label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
}

.tag-field { margin-top: 12px; }

.tag-pick { display: flex; flex-wrap: wrap; gap: 6px; }

.tag-pick button {
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 99px;
  padding: 4px 10px;
  font-size: 13px;
}

.tag-pick button[aria-pressed="true"] {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.dialog-actions { margin-top: 16px; justify-content: flex-end; }

.print-head { display: none; }

#toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%) translateY(8px);
  opacity: 0;
  pointer-events: none;
  background: #0f172a;
  color: #fff;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13px;
  transition: 0.15s ease;
  z-index: 50;
}

#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (hover: hover) {
  .btn:hover, .chip:hover, .rail button:hover, #rush button:hover, .cal-grid button:hover, .cal-nav button:hover, .cal-detail button:hover, .icon-btn:hover { background: var(--soft); }
  .note-btn:hover { border-color: var(--blue); background: var(--card); }
  .note-btn.is-on:hover, .note-btn[aria-expanded="true"]:hover { background: var(--blue-soft); }
  .item-title:hover { color: var(--blue); }
  .tag-pick button[aria-pressed="true"]:hover { background: var(--blue); color: #fff; }
  .cal-grid button.is-on:hover { background: var(--blue); color: #fff; }
  .btn.primary:hover, .view-btn[aria-pressed="true"]:hover { background: var(--blue); color: #fff; }
  .chip[aria-pressed="true"]:hover, .rail button.is-now:hover { background: var(--blue-soft); color: var(--blue); }
}

@media (max-width: 980px) {
  .shell { display: flex; flex-direction: column; align-items: stretch; }
  .side { display: contents; }
  .side-next, .side-courses, .cal, .content { width: 100%; min-width: 0; }
  .side-next { order: 1; }
  .content { order: 2; }
  .cal { order: 3; border-bottom: 1px solid var(--line); }
  .side-courses { order: 4; }
  .side-next, .side-courses {
    padding: 16px;
    background: var(--side);
    border-bottom: 1px solid var(--line);
  }
  .side-courses > .side-label { margin-top: 0; }
  .cal {
    position: static;
    height: auto;
    border-left: none;
  }
}

@media (max-width: 860px) {
  .topbar {
    height: auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    grid-template-areas:
      "brand today add"
      "views views views"
      "search search search"
      "check check theme";
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
  }
  .brand { grid-area: brand; }
  .today { grid-area: today; justify-self: end; }
  .views { grid-area: views; width: 100%; }
  .views .view-btn { flex: 1; padding: 8px 10px; }
  #addBtn { grid-area: add; }
  .search { grid-area: search; margin-left: 0; }
  .search input { width: 100%; }
  .check { grid-area: check; }
  #themeBtn { grid-area: theme; justify-self: end; }
  #rush .rush-row {
    flex-direction: row;
    overflow-x: auto;
    max-width: 100%;
    gap: 6px;
  }
  #rush button { width: auto; flex: none; flex-wrap: nowrap; }
  .chips { flex-direction: column; gap: 4px; }
  .chips > .chip { width: 100%; }
  .course-row { width: 100%; }
  .course-row .chip { flex-wrap: nowrap; align-items: center; gap: 8px; }
  .course-row .chip-name {
    flex: 1 1 auto;
    max-width: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .content { padding: 12px; }
}

@media (max-width: 640px) {
  .day, .chapter, .course, #list { scroll-margin-top: 148px; }
  .day { grid-template-columns: 1fr; }
  .day-label { display: flex; gap: 8px; align-items: baseline; padding: 10px 14px 0; }
  .day-meta { display: inline; }
  .item { grid-template-columns: auto minmax(0, 1fr) auto; }
  .item-main { flex-wrap: wrap; }
  .tick, .icon-btn { width: 36px; height: 36px; }
  .note-btn { width: 34px; height: 34px; }
  .cal-grid button, .cal-wk, button.cal-wk { height: 40px; }
  .tag-pick button { min-height: 36px; padding: 6px 12px; }
  .foot { flex-direction: column; align-items: stretch; }
  .foot-actions { flex-wrap: wrap; }
  .foot-actions .btn { flex: 1; }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  #toast { transition: none; }
}

@media print {
  .topbar, .side, .cal, .list-head, .foot, .item-tools, .item-actions, #toast { display: none !important; }
  .frame { box-shadow: none; width: 100%; }
  .print-head { display: block; font-size: 16px; font-weight: 600; margin-bottom: 8px; }
  .shell { display: block; }
  body { background: white; color: black; }
  #list { border: none; }
}