:root {
  --bg: #eef1f0;
  --surface: #fdfbf6;
  --surface-alt: #ebeeed;
  --border: #d7dedb;
  --ink: #181c1c;
  --ink-soft: #50625e;
  --ink-faint: #8a968f;
  --primary: #1f5c56;
  --primary-strong: #123a35;
  --primary-grad-from: #2b7a6f;
  --primary-grad-to: #123a35;
  --secondary: #cfe3de;
  --secondary-ink: #123a35;
  --tertiary: #b96a1f;
  --tertiary-soft: #fbead9;
  --danger: #b5423a;
  --danger-soft: #fbe6e3;
  --shadow-1: 0 1px 2px rgba(27, 44, 40, 0.04), 0 4px 12px rgba(27, 44, 40, 0.03);
  --shadow-2: 0 4px 16px rgba(18, 58, 53, 0.08), 0 12px 28px rgba(18, 58, 53, 0.06);
  --overlay: rgba(15, 25, 20, 0.42);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121614;
    --surface: #1a201d;
    --surface-alt: #202722;
    --border: #2d3733;
    --ink: #eaeeec;
    --ink-soft: #a7b2ac;
    --ink-faint: #6f7b75;
    --primary: #3c8b82;
    --primary-strong: #9fd6cc;
    --secondary: #223330;
    --secondary-ink: #cfe3de;
    --tertiary: #dd9b52;
    --tertiary-soft: #33271a;
    --danger: #e08078;
    --danger-soft: #33201d;
    --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-2: 0 4px 16px rgba(0, 0, 0, 0.4), 0 12px 28px rgba(0, 0, 0, 0.35);
    --overlay: rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", "Noto Sans JP", "Hiragino Sans", sans-serif;
  padding: 0 20px;
  padding-block: 24px 64px;
}

h1, h2, h3 { font-family: "Noto Serif JP", "Noto Serif", serif; }

.wrap { max-width: 880px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }

.top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand h1 { font-size: 26px; font-weight: 600; margin: 0; letter-spacing: 0.02em; text-wrap: balance; }
.brand .date { color: var(--ink-faint); font-size: 13px; font-variant-numeric: tabular-nums; }

.icon-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-soft);
  width: 38px; height: 38px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.icon-btn:hover { border-color: var(--primary); color: var(--primary); }
.icon-btn:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--primary); outline-offset: 2px;
}

.summary {
  background: linear-gradient(155deg, var(--primary-grad-from), var(--primary-grad-to));
  border-radius: 16px;
  padding: 20px 22px;
  box-shadow: var(--shadow-2);
  display: flex; flex-direction: column; gap: 14px;
  color: #fdfbf6;
}
.summary-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.summary-label { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: #cfe3de; font-weight: 700; margin: 0 0 4px; }
.summary-count { font-size: 34px; font-weight: 700; font-variant-numeric: tabular-nums; margin: 0; }
.summary-count span { font-size: 15px; font-weight: 500; color: #cfe3de; margin-left: 4px; }
.summary-tasks { display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; list-style: none; }
.summary-tasks li { background: rgba(253, 251, 246, 0.14); border: 1px solid rgba(253, 251, 246, 0.28); color: #fdfbf6; font-size: 12.5px; padding: 4px 10px; border-radius: 999px; }
.summary-empty { color: #cfe3de; font-size: 13.5px; }

.btn { border: none; border-radius: 10px; padding: 10px 16px; font-size: 14px; font-weight: 700; cursor: pointer; font-family: inherit; display: inline-flex; align-items: center; gap: 6px; transition: filter .15s, background .15s; white-space: nowrap; }
.btn-primary { background: var(--primary); color: #fdfbf6; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-on-summary { background: #fdfbf6; color: var(--primary-strong); }
.btn-on-summary:hover { filter: brightness(0.97); }
.btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--secondary); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { filter: brightness(1.08); }
.btn-text { background: none; border: none; color: var(--ink-faint); font-weight: 500; cursor: pointer; font-size: 13px; padding: 6px 4px; font-family: inherit; }
.btn-text:hover { color: var(--ink-soft); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; filter: none; }

section.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 18px 20px 20px; box-shadow: var(--shadow-1); }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.panel-head h2 { font-size: 15px; margin: 0; font-weight: 600; }
.panel-head .count { color: var(--ink-faint); font-weight: 500; font-size: 13px; font-family: "Inter", sans-serif; }

ul.tasks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.task { display: flex; align-items: flex-start; gap: 10px; padding: 10px 10px 10px 8px; border-radius: 10px; border: 1px solid transparent; }
.task:hover { background: var(--secondary); border-color: var(--border); }
.task .check { appearance: none; width: 19px; height: 19px; border-radius: 4px; border: 1.5px solid var(--primary); margin-top: 2px; flex: none; cursor: pointer; display: grid; place-content: center; background: var(--surface); }
.task .check:checked { background: var(--primary); border-color: var(--primary); }
.task .check:checked::after { content: "✓"; color: var(--surface); font-size: 13px; font-weight: 700; line-height: 1; }
.task .body { flex: 1; min-width: 0; }
.task .name { font-size: 14.5px; font-weight: 500; word-break: break-word; }
.task.done .name { color: var(--ink-faint); text-decoration: line-through; }
.task .meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 3px; }
.task .due { font-size: 12px; color: var(--tertiary); font-variant-numeric: tabular-nums; background: var(--tertiary-soft); padding: 1px 8px; border-radius: 999px; }
.task .memo { font-size: 12.5px; color: var(--ink-soft); white-space: pre-wrap; margin-top: 4px; }
.task .actions { display: flex; gap: 2px; flex: none; opacity: 0; transition: opacity .1s; }
.task:hover .actions, .task:focus-within .actions { opacity: 1; }
.task .actions button { border: none; background: none; color: var(--ink-faint); cursor: pointer; padding: 4px; border-radius: 6px; }
.task .actions button:hover { color: var(--primary); background: var(--secondary); }
.empty-hint { color: var(--ink-faint); font-size: 13.5px; padding: 14px 4px; }

.add-row { margin-top: 12px; }

.history-day { border-top: 1px dashed var(--border); padding-top: 10px; margin-top: 10px; }
.history-day:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.history-day .day-label { font-size: 12px; color: var(--ink-faint); font-weight: 700; letter-spacing: 0.03em; margin-bottom: 6px; font-variant-numeric: tabular-nums; }
details.history > summary { cursor: pointer; list-style: none; display: flex; align-items: center; gap: 8px; color: var(--ink-soft); font-size: 13.5px; font-weight: 700; padding: 4px 0; }
details.history > summary::-webkit-details-marker { display: none; }
details.history > summary .chev { transition: transform .15s; color: var(--ink-faint); }
details.history[open] > summary .chev { transform: rotate(90deg); }
details.history > summary:hover { color: var(--primary); }

dialog { border: none; border-radius: 16px; padding: 0; background: var(--surface); color: var(--ink); box-shadow: var(--shadow-2); width: min(480px, 92vw); max-height: 88vh; }
dialog::backdrop { background: var(--overlay); }
.dialog-top-stripe { height: 6px; background: linear-gradient(90deg, var(--primary), var(--secondary)); border-radius: 16px 16px 0 0; }
.dialog-inner { padding: 20px 22px 22px; display: flex; flex-direction: column; gap: 14px; max-height: 88vh; overflow-y: auto; }
.dialog-inner h3 { margin: 0; font-size: 17px; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 12.5px; font-weight: 700; color: var(--ink-soft); font-family: "Inter", sans-serif; }
.field .hint { font-size: 11.5px; color: var(--ink-faint); font-weight: 500; }
input[type="text"], input[type="date"], input[type="email"], textarea {
  font-family: "Inter", "Noto Sans JP", sans-serif; font-size: 14px; padding: 9px 10px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg); color: var(--ink); width: 100%;
}
textarea { resize: vertical; min-height: 64px; line-height: 1.5; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 4px; }
.dialog-actions.split { justify-content: space-between; }
.field-error { color: var(--danger); font-size: 12.5px; min-height: 16px; }

.report-body { white-space: pre-wrap; font-size: 13.5px; line-height: 1.7; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; min-height: 160px; }
.report-field { display: flex; flex-direction: column; gap: 3px; font-size: 13px; }
.report-field .k { color: var(--ink-faint); font-weight: 700; font-size: 11.5px; letter-spacing: 0.05em; font-family: "Inter", sans-serif; }
.copy-status { font-size: 12.5px; color: var(--primary); min-height: 16px; }

a.link-btn { text-decoration: none; }

.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 999px; font-size: 13px; box-shadow: var(--shadow-2); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }
.toast.error { background: var(--danger); color: white; }

@media (max-width: 480px) {
  .brand h1 { font-size: 22px; }
  .summary-count { font-size: 28px; }
}