:root {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: #20252b;
  background: #f7f8fa;
  --accent: #205c9d;
  --line: #d7dce2;
  --muted: #59636e;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
button, input, select { font: inherit; }
button {
  min-height: 44px;
  padding: 8px 14px;
  color: #29323c;
  background: #fff;
  border: 1px solid #aeb8c3;
  border-radius: 4px;
  cursor: pointer;
}
button:hover { background: #eef2f6; }
button:disabled { opacity: .6; cursor: wait; }
button.primary { color: #fff; background: var(--accent); border-color: var(--accent); }
button.primary:hover { background: #174575; }
:focus-visible { outline: 3px solid #438bd0; outline-offset: 3px; }
input, select {
  display: block;
  width: 100%;
  min-width: 0;
  min-height: 44px;
  margin-top: 4px;
  padding: 8px 10px;
  color: inherit;
  background: #fff;
  border: 1px solid #aeb8c3;
  border-radius: 4px;
}
label { display: block; margin: 12px 0; font-size: .9rem; }
small { color: var(--muted); font-size: .8rem; }
h1, h2, h3, h4, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: 1.5rem; line-height: 1.4; }
h2 { margin-bottom: 12px; font-size: 1.1rem; }
h3 { margin-bottom: 10px; font-size: 1rem; }
h4 { margin: 20px 0 8px; font-size: .95rem; }
p { margin-bottom: 12px; }
.layout { display: grid; grid-template-columns: 210px minmax(0, 1fr); min-height: 100vh; }
aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 20px 16px;
  background: #fff;
  border-right: 1px solid var(--line);
}
.brand { color: inherit; font-size: 1rem; font-weight: 700; text-decoration: none; }
.back-to-directory { font-size: .85rem; }
nav { display: flex; flex-direction: column; gap: 4px; }
nav a { padding: 10px; border-radius: 4px; color: #34404c; text-decoration: none; }
nav a:hover { background: #f0f3f6; }
nav a[aria-current] { color: #144b83; background: #e8f0f9; font-weight: 700; }
.sidebar-bottom { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; margin-top: auto; }
.quiet { background: transparent; border-color: transparent; font-size: .85rem; }
main { width: 100%; max-width: 1100px; padding: 20px 28px 40px; margin: 0 auto; }
.directory-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.directory-layout main { max-width: 960px; }
.tool-header { color: var(--muted); font-size: .85rem; }
.page-heading { margin: 16px 0 20px; }
.page-heading p { margin: 8px 0 0; color: var(--muted); font-size: .9rem; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 0 0 16px; }
.section-heading h2 { margin: 0; }
.section-heading > span, .section-heading > a { font-size: .85rem; }
.tool-grid, .activity-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.tool-card, .activity-card, .panel { padding: 18px; border: 1px solid var(--line); border-radius: 5px; background: #fff; }
.tool-card { display: block; color: inherit; text-decoration: none; }
.tool-card:hover { border-color: var(--accent); background: #f3f7fc; }
.tool-card h3 { color: var(--accent); text-decoration: underline; }
.tool-card p { margin: 0; color: var(--muted); font-size: .85rem; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 12px; }
.tag { padding: 2px 6px; color: #354658; border: 1px solid #d2dce6; border-radius: 3px; font-size: .8rem; }
.tag.danger { color: #8a351e; background: #fff2ed; border-color: #d9b7aa; }
.target { font-size: .9rem; }
.target strong { margin-left: 8px; }
.time-input { display: flex; gap: 10px; max-width: 260px; }
.time-input label { flex: 1; }
.card-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.muted { color: var(--muted); font-size: .85rem; }
.penalty { color: #8a351e; font-size: .85rem; }
.timer-section { margin-top: 28px; }
.running { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding: 16px; margin-bottom: 16px; background: #fff; border: 1px solid var(--accent); border-radius: 5px; }
.running h3 { margin: 4px 0 0; }
.running strong { font-size: 1.5rem; font-variant-numeric: tabular-nums; }
.panel { margin-bottom: 16px; }
.panel > form { max-width: 620px; }
summary { cursor: pointer; font-size: 1rem; font-weight: 600; }
summary > span { display: block; margin-top: 4px; }
details[open] > summary { margin-bottom: 16px; }
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.checkbox { display: flex; align-items: center; gap: 8px; }
.checkbox input { width: 20px; height: 20px; min-height: 0; margin: 0; }
.inline-form { display: flex; align-items: end; flex-wrap: wrap; gap: 12px; }
.inline-form label { margin: 0; }
fieldset { margin: 12px 0; padding: 8px 14px 14px; border: 1px solid var(--line); border-radius: 4px; }
legend { font-size: .9rem; }
.penalty-rule:not(:has(input[type="checkbox"]:checked)) > .time-input,
.penalty-rule:not(:has(input[type="checkbox"]:checked)) > label { display: none; }
.rule-history { padding-left: 20px; font-size: .85rem; }
.date-selector { display: flex; align-items: end; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.date-selector label { margin: 0; }
.empty { padding: 20px; border: 1px solid var(--line); background: #fff; }
.empty a { display: inline-block; margin-left: 8px; }
.message:not(:empty) { padding: 12px; margin: 12px 0; border: 1px solid #ce9f88; border-radius: 4px; background: #fff5ef; color: #7b301a; }
.message.success:not(:empty) { border-color: #9ab9a4; background: #f1f8f3; color: #27583a; }
.login { max-width: 400px; margin: 8vh auto; padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 5px; }
.login > .brand { display: inline-block; margin-bottom: 20px; }
.login form button { width: 100%; margin: 12px 0; }
.login small { display: block; }
@media (max-width: 900px) {
  .activity-grid { grid-template-columns: 1fr; }
  main { padding: 20px; }
}
@media (max-width: 650px) {
  .layout { display: block; }
  aside { position: static; height: auto; gap: 12px; padding: 12px 16px; border-right: 0; border-bottom: 1px solid var(--line); }
  nav { flex-direction: row; overflow-x: auto; white-space: nowrap; }
  nav a { padding: 10px; font-size: .85rem; }
  .sidebar-bottom { flex-direction: row; gap: 8px; margin-top: 0; }
  main { padding: 16px; }
  .directory-header { padding: 10px 16px; }
  .tool-grid, .two-columns { grid-template-columns: 1fr; }
  .two-columns { gap: 0; }
  .section-heading { align-items: start; }
  .section-heading > span { max-width: 60%; }
  .card-top { flex-wrap: wrap; }
  input, select { font-size: 16px; }
  .login { margin: 24px 16px; width: auto; }
}