:root {
  --background: #f5f5f7;
  --surface: #ffffff;
  --surface-soft: #f7f7f9;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #8e8e93;
  --line: rgba(60, 60, 67, 0.16);
  --line-strong: rgba(60, 60, 67, 0.24);
  --focus: #0071e3;
  --brand: #718260;
  --brand-soft: #edf1e9;
  --danger: #a63f3a;
  --danger-bg: #fff7f6;
  --danger-line: rgba(166, 63, 58, 0.18);
  --warning: #8a6416;
  --warning-bg: #fffaf0;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 28px rgba(0, 0, 0, 0.05);
  --radius: 20px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  line-height: 1.5;
}

button, input, select { font: inherit; }

/* Header */
.appbar {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: env(safe-area-inset-top) 0 0;
  color: var(--text);
  background: rgba(245, 245, 247, 0.84);
  border-bottom: 1px solid rgba(60, 60, 67, 0.1);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
}
.appbar__inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
  padding: 14px 18px 13px;
}
.appbar__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 25px;
  height: 25px;
  border-radius: 8px;
  color: #fff;
  background: var(--brand);
  font-size: 14px;
  font-weight: 700;
}
.appbar__title {
  margin: 0;
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.02em;
}

/* Layout */
.container { max-width: 600px; margin: 0 auto; padding: 20px 16px 8px; }

/* Overdue notice: displayed only after the due date */
.alert-banner {
  display: block;
  width: 100%;
  margin: 0 0 16px;
  padding: 13px 15px;
  color: var(--danger);
  background: var(--danger-bg);
  border: 1px solid var(--danger-line);
  border-radius: 14px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.45;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.alert-banner[hidden] { display: none; }
.alert-banner:active { transform: scale(0.995); opacity: 0.8; }
.alert-banner .alert-banner__sub {
  display: block;
  margin-top: 3px;
  color: #8a6663;
  font-size: 12px;
  font-weight: 400;
}

/* Main checker */
.checker {
  margin-bottom: 24px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid rgba(60, 60, 67, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.checker__inputs { display: flex; flex-direction: column; gap: 15px; }

.field { display: block; }
.type-field { min-width: 0; margin: 0; padding: 0; border: 0; }
.field__label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 7px;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  color: var(--text-secondary);
  background: #ededf0;
  font-size: 11px;
  font-weight: 650;
}
.type-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
  padding: 3px;
  background: #ededf0;
  border-radius: 11px;
}
.type-switch label { position: relative; cursor: pointer; }
.type-switch input { position: absolute; opacity: 0; pointer-events: none; }
.type-switch span {
  display: block;
  padding: 9px 7px;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 550;
  text-align: center;
  transition: color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.type-switch input:checked + span {
  color: var(--text);
  background: var(--surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}
.type-switch input:focus-visible + span { outline: 3px solid rgba(0, 113, 227, 0.22); }

.field select,
.field input {
  width: 100%;
  padding: 12px 13px;
  color: var(--text);
  background-color: var(--surface-soft);
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 16px;
  appearance: none;
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.field select {
  padding-right: 40px;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2.2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}
.field select:focus,
.field input:focus,
.save-row input:focus {
  outline: none;
  background-color: var(--surface);
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.14);
}

/* Date result */
.result {
  margin: 18px 0;
  padding: 22px 16px 20px;
  background: var(--surface-soft);
  border: 1px solid transparent;
  border-radius: 16px;
  text-align: center;
  transition: background 0.18s ease, border-color 0.18s ease;
}
.result__caption {
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.result__date {
  margin: 5px 0 3px;
  color: var(--text);
  font-size: 36px;
  font-weight: 650;
  line-height: 1.16;
  letter-spacing: -0.045em;
  font-variant-numeric: tabular-nums;
}
.result__hint { color: var(--text-secondary); font-size: 12px; }
.result--empty { background: #f8f8fa; }
.result--empty .result__date { color: #c7c7cc; font-size: 28px; letter-spacing: 0.12em; }
.result--ok,
.result--due { background: var(--surface-soft); }
.result--over {
  background: var(--danger-bg);
  border-color: var(--danger-line);
}
.result--over .result__date { color: var(--danger); }
.result--over .result__hint { color: #8a6663; }
.result--warn { background: var(--warning-bg); }
.result--warn .result__date { color: var(--warning); font-size: 22px; letter-spacing: -0.02em; }
.result--warn .result__caption { color: #8a7347; }

/* Save */
.save-row { display: flex; gap: 8px; }
.save-row input {
  flex: 1;
  min-width: 0;
  padding: 11px 12px;
  color: var(--text);
  background: var(--surface-soft);
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 14px;
}
.btn {
  padding: 11px 17px;
  border: 0;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.08s ease, opacity 0.15s ease;
}
.btn:active { transform: scale(0.98); }
.btn--primary { color: #fff; background: var(--text); }
.btn--primary:disabled { color: #a1a1a6; background: #e5e5e7; cursor: default; }

/* Saved cases */
.list-head { display: flex; align-items: center; justify-content: space-between; margin: 4px 2px 11px; }
.list-head__title { margin: 0; color: var(--text); font-size: 15px; font-weight: 650; letter-spacing: -0.01em; }
.toggle { display: flex; align-items: center; gap: 6px; color: var(--text-secondary); font-size: 12px; }
.toggle input { accent-color: var(--text); }

.list { display: flex; flex-direction: column; gap: 10px; }
.item {
  padding: 15px;
  background: var(--surface);
  border: 1px solid rgba(60, 60, 67, 0.08);
  border-radius: 17px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.025);
}
.item--due { background: var(--surface); }
.item--over { background: var(--danger-bg); border-color: var(--danger-line); }
.item--unknown { background: #fffdf8; }
.item--done { opacity: 0.52; }
.item__top { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.item__label { flex: 1; color: var(--text); font-size: 15px; font-weight: 600; word-break: break-all; }
.badge {
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 10.5px;
  font-weight: 600;
  white-space: nowrap;
}
.badge--wait { color: var(--text-secondary); background: #efeff1; }
.badge--due { color: #53687c; background: #eef3f7; }
.badge--over { color: var(--danger); background: #f8e9e7; }
.badge--unknown { color: var(--warning); background: #f8f0dc; }
.badge--done { color: var(--text-tertiary); background: #efeff1; }
.item__office,
.item__row { color: var(--text-secondary); font-size: 12px; }
.item__due { margin-top: 3px; color: var(--text-secondary); font-size: 13px; }
.item__due b { color: var(--text); font-size: 15px; font-weight: 600; }
.item__source { margin-left: 6px; color: var(--text-tertiary); font-size: 11px; font-weight: 500; }
.item--over .item__due b { color: var(--danger); }
.item__actions { display: flex; gap: 8px; margin-top: 11px; }
.mini {
  padding: 6px 11px;
  color: var(--text-secondary);
  background: #f3f3f5;
  border: 0;
  border-radius: 9px;
  font-size: 11.5px;
  font-weight: 550;
  cursor: pointer;
}
.mini--done { color: #3d5f76; }
.mini--undo { color: var(--text-secondary); }
.mini--del { margin-left: auto; color: #9b5a56; background: transparent; }
.empty { padding: 25px 16px; color: var(--text-tertiary); text-align: center; font-size: 12px; }

/* Footer */
.footer {
  max-width: 600px;
  margin: 0 auto;
  padding: 14px 18px calc(28px + env(safe-area-inset-bottom));
  color: var(--text-tertiary);
  font-size: 10.5px;
}
.footer p { margin: 4px 0; }
.footer__note { line-height: 1.55; }

@media (max-width: 390px) {
  .container { padding-inline: 12px; }
  .checker { padding: 15px; }
  .result__date { font-size: 32px; }
  .save-row { flex-direction: column; }
  .btn { width: 100%; }
}