:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --panel-soft: #f0f3f7;
  --text: #17212b;
  --muted: #607080;
  --line: #dbe3eb;
  --accent: #1f6feb;
  --accent-strong: #1552b8;
  --danger: #c83b32;
  --ok: #2f9e44;
  --warn: #c98210;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 28, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
  font-size: 16px;
}

input,
textarea,
select {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  padding: 9px 10px;
}

textarea {
  resize: vertical;
  min-height: 72px;
}

button {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 12px;
  min-height: 42px;
  cursor: pointer;
  background: var(--panel-soft);
  color: var(--text);
}

button:hover {
  filter: brightness(0.98);
}

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

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-danger {
  color: var(--danger);
  border-color: #efc7c4;
  background: #fff5f5;
}

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

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 16px 32px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--accent);
}

.brand h1 {
  margin: 0;
  font-size: 23px;
  letter-spacing: 0.3px;
}

.brand small {
  display: block;
  color: var(--muted);
  margin-top: 2px;
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 16px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.sidebar,
.main {
  padding: 14px;
}

.section-title {
  font-size: 13px;
  letter-spacing: 0.5px;
  color: var(--muted);
  margin: 0 0 8px;
  text-transform: uppercase;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.row-wrap {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.auth-panel {
  max-width: 420px;
  margin: 80px auto;
  padding: 20px;
}

.auth-panel h2 {
  margin: 0 0 8px;
}

.auth-panel p {
  color: var(--muted);
  margin: 0 0 14px;
}

.hidden {
  display: none !important;
}

.task-groups {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.task-group h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.task-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 10px;
}

.task-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: start;
}

.task-title {
  font-weight: 600;
  line-height: 1.4;
  margin-top: 2px;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.pill {
  font-size: 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 8px;
  color: var(--muted);
}

.pill.p1 {
  color: #fff;
  background: var(--danger);
  border-color: var(--danger);
}

.pill.p2 {
  color: #fff;
  background: var(--warn);
  border-color: var(--warn);
}

.pill.p3 {
  color: #fff;
  background: var(--ok);
  border-color: var(--ok);
}

.task-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.task-actions button {
  padding: 8px 10px;
  font-size: 13px;
  min-height: 38px;
}

.task-edit {
  margin-top: 10px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

.subtasks {
  display: flex;
  flex-direction: column;
  gap: 7px;
  margin-top: 8px;
}

.subtask-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 7px;
  align-items: center;
}

.subtask-row .subtask-title.done,
.task-title.done {
  text-decoration: line-through;
  color: var(--muted);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tabs button.active {
  background: var(--text);
  color: #fff;
  border-color: var(--text);
}

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

.version-links {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.version-links a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  text-decoration: none;
  font-size: 12px;
  white-space: nowrap;
}

.version-links a.current {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.notice {
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
}

.footer-note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .page {
    padding: 10px 8px 20px;
  }

  .topbar-actions {
    width: 100%;
  }

  .topbar-actions button {
    min-height: 44px;
  }

  .brand h1 {
    font-size: 20px;
  }

  .sidebar,
  .main {
    padding: 10px;
  }

  .tabs {
    gap: 6px;
  }

  .tabs button {
    flex: 1 1 calc(33.33% - 6px);
    min-height: 44px;
    padding: 8px 6px;
    font-size: 14px;
  }

  .task-item {
    padding: 9px;
  }

  .task-head {
    grid-template-columns: auto 1fr;
  }

  .task-actions {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .row-wrap > * {
    flex: 1 1 100%;
  }

  .subtask-row {
    grid-template-columns: auto 1fr;
  }

  .subtask-row .subtask-delete {
    grid-column: 1 / -1;
  }
}