:root {
  --bg: #faf9f6; --fg: #1f2933; --muted: #5f6c7b; --card: #ffffff;
  --accent: #2f6f5e; --border: #dcd8cf;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161a1d; --fg: #e8e6e1; --muted: #a0a8b0; --card: #1f2428;
    --accent: #6fbf9f; --border: #343b41;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg); line-height: 1.7;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; background: var(--card); padding: .5rem; }
.site-header {
  display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; align-items: center;
  padding: .75rem 1.25rem; border-bottom: 1px solid var(--border); background: var(--card);
}
.brand { display: flex; flex-direction: column; }
.brand-name { font-weight: 700; font-size: 1.15rem; }
.brand-tagline { font-size: .8rem; color: var(--muted); }
.nav { display: flex; flex-wrap: wrap; gap: .25rem .75rem; flex: 1; }
.nav a { color: var(--fg); text-decoration: none; padding: .35rem .5rem; border-radius: 6px; }
.nav a:hover { background: var(--bg); }
.lang { display: flex; gap: .25rem; }
.lang button {
  font: inherit; padding: .35rem .75rem; min-height: 40px; cursor: pointer;
  border: 1px solid var(--border); background: var(--card); color: var(--fg); border-radius: 6px;
}
.lang button[aria-current="true"] { background: var(--accent); color: var(--bg); font-weight: 700; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
main { max-width: 52rem; margin: 0 auto; padding: 2rem 1.25rem; }
.lead { font-size: 1.2rem; }
.muted, .site-footer { color: var(--muted); }
.site-footer { text-align: center; padding: 1.5rem; font-size: .85rem; }

/* Phase 3 */
h1 { line-height: 1.3; } h2 { margin-top: 2rem; font-size: 1.2rem; } h3 { font-size: 1.05rem; }
a { color: var(--accent); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1rem 1.25rem; margin: 1rem 0; }
.plain { list-style: none; padding: 0; margin: 0; }
.plain > li { margin: .5rem 0; }
.empty { color: var(--muted); padding: .5rem 0; }
.form label { display: block; margin-top: .75rem; font-weight: 600; }
.form input:not([type=checkbox]), .form textarea, .form select, .filters input, .filters select, .quick-add input {
  font: inherit; width: 100%; max-width: 40rem; padding: .5rem; color: var(--fg);
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
}
.form .check { font-weight: 400; display: flex; gap: .5rem; align-items: center; }
.btn { font: inherit; display: inline-block; padding: .4rem .85rem; min-height: 40px; cursor: pointer;
  text-decoration: none; color: var(--fg); background: var(--card); border: 1px solid var(--border); border-radius: 6px; }
.btn.primary { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 700; }
.link-btn { font: inherit; background: none; border: 0; color: var(--muted); text-decoration: underline; cursor: pointer; padding: .5rem 0; }
.inline { display: inline-flex; gap: .35rem; align-items: center; margin: .15rem .25rem .15rem 0; }
.quick-add { display: flex; gap: .5rem; flex-wrap: wrap; margin: 1rem 0; }
.quick-add input { flex: 1 1 14rem; }
.tabs { display: flex; flex-wrap: wrap; gap: .25rem .75rem; margin: 1rem 0; }
.tabs a { padding: .3rem .5rem; text-decoration: none; border-bottom: 2px solid transparent; }
.tabs a[aria-current="page"] { border-bottom-color: var(--accent); font-weight: 700; }
.filters { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin: 1rem 0; }
.filters input, .filters select { width: auto; }
.tasks { list-style: none; padding: 0; margin: 0; }
.task { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1rem;
  padding: .75rem 0; border-bottom: 1px solid var(--border); }
.task.done .task-title { text-decoration: line-through; color: var(--muted); }
.task-title { font-weight: 600; }
.task-meta { display: flex; flex-wrap: wrap; gap: .25rem .75rem; font-size: .85rem; color: var(--muted); }
.task-meta .flag { color: var(--fg); font-weight: 700; }
.task-meta .flag::before { content: "\25B6\00a0"; }
.why-small { font-size: .85rem; color: var(--muted); margin: .25rem 0; }
.field-error { color: var(--fg); border-left: 4px solid var(--accent); padding-left: .5rem; font-weight: 600; }
.daynav { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.intention { font-size: 1.1rem; font-style: italic; }
.next-action { font-size: 1.1rem; }
.skip-form { margin-top: 1rem; }

/* Phase 4 */
.notice { border-left: 4px solid var(--accent); background: var(--card); padding: .6rem .9rem; border-radius: 4px; }
kbd { font: inherit; padding: 0 .4rem; border: 1px solid var(--border); border-radius: 4px; background: var(--card); }

/* Phase 5 */
.more { position: relative; }
.more summary { cursor: pointer; padding: .35rem .5rem; border-radius: 6px; list-style: none; }
.more summary::-webkit-details-marker { display: none; }
.more summary::after { content: " \25BE"; }
.more-list { position: absolute; z-index: 5; background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: .35rem; display: flex; flex-direction: column; min-width: 12rem; }

/* Phase 7: polish */
.menu-btn { display: none; font: inherit; min-height: 44px; padding: .4rem .9rem; cursor: pointer;
  color: var(--fg); background: var(--card); border: 1px solid var(--border); border-radius: 6px; }
.btn, .lang button, .tabs a, .nav a { white-space: normal; text-align: center; }
.task-title, .card, .why-small, .task-meta, h1, h2, h3, li { overflow-wrap: anywhere; }
.task-main { flex: 1 1 18rem; min-width: 0; }
.task-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem; }
input[type="date"], input[type="time"] { min-height: 40px; }
@media (max-width: 760px) {
  main { padding: 1.25rem 1rem; }
  .site-header { padding: .6rem 1rem; }
  .menu-btn { display: inline-block; }
  .js .nav { display: none; flex-basis: 100%; flex-direction: column; }
  .js .nav.open { display: flex; }
  .nav a, .more summary { padding: .6rem .5rem; min-height: 44px; display: flex; align-items: center; }
  .more-list { position: static; border: 0; padding-left: 1rem; }
  .task-actions .btn, .quick-add .btn { min-height: 44px; }
  .task-actions form.inline { flex-wrap: wrap; }
  .form input:not([type=checkbox]):not([type=radio]), .form textarea, .form select { max-width: 100%; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }
.card > h2:first-child, .card > form > h2:first-child { margin-top: 0; }
.filters select, .filters input { max-width: 100%; min-width: 0; }
@media (max-width: 760px) {
  .filters { flex-direction: column; align-items: stretch; }
  .filters input, .filters select { width: 100%; }
  .filters .btn { align-self: flex-start; }
}

.logout { margin: 0; }
.signed-in { font-size: .85rem; margin-right: .5rem; overflow-wrap: anywhere; }
.logout { display: flex; align-items: center; flex-wrap: wrap; }