/* ===== design tokens ===== */
:root {
  --bg: #f6f1e7;
  --surface: #fffdfa;
  --ink: #2a2724;
  --ink-soft: #6b6358;
  --line: #e4dcc9;
  --accent: #1f5c4d;
  --accent-soft: #dce8e2;
  --stamp-red: #b23a2e;
  --stamp-red-soft: #f3dedb;
  --radius: 14px;
  --shadow: 0 1px 0 rgba(42, 39, 36, 0.04), 0 8px 20px -12px rgba(42, 39, 36, 0.18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Noto Sans JP', sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2 { font-family: 'Shippori Mincho B1', serif; margin: 0; }

button { font-family: inherit; }

/* faint ledger rule lines across the whole app, like ruled paper */
body {
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 31px,
    var(--line) 31px,
    var(--line) 32px
  );
}

/* ===== header ===== */
.ledger-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  padding: max(16px, env(safe-area-inset-top)) 18px 10px;
  border-bottom: 1px solid var(--line);
}
.ledger-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.ledger-header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.icon-btn {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
}
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.icon-btn:active { transform: scale(0.96); }

.month-picker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 10px;
}
.month-picker__label {
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  letter-spacing: 0.04em;
  min-width: 8em;
  text-align: center;
}

/* ===== layout ===== */
#app {
  max-width: 560px;
  margin: 0 auto;
  padding: 18px 14px 48px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 16px 16px;
  position: relative;
  overflow: hidden;
}

.card__title {
  font-size: 1.02rem;
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 12px;
}
.card__title-sub {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.74rem;
  font-weight: 400;
  color: var(--ink-soft);
}

.chart-wrap { position: relative; width: 100%; }
.chart-wrap--donut { max-width: 280px; margin: 0 auto; }

/* ===== summary card (signature element: hanko/seal) ===== */
.summary-card {
  background: linear-gradient(180deg, var(--surface) 0%, var(--accent-soft) 130%);
}
.summary-card__row {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}
.summary-stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.55);
}
.summary-stat__label {
  font-size: 0.74rem;
  color: var(--ink-soft);
}
.summary-stat__value {
  font-family: 'Shippori Mincho B1', serif;
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
}

.summary-card__net {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}
.summary-card__net-label {
  font-size: 0.8rem;
  color: var(--ink-soft);
}
.summary-card__net-value {
  font-family: 'Shippori Mincho B1', serif;
  font-size: 1.9rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}
.summary-card__net-value.is-negative { color: var(--stamp-red); }

/* hanko-style seal badge */
.seal {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2.5px solid var(--accent);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  font-family: 'Shippori Mincho B1', serif;
  letter-spacing: 0.06em;
  transform: rotate(-6deg);
  background: rgba(255, 255, 255, 0.5);
}
.seal.is-over {
  border-color: var(--stamp-red);
  color: var(--stamp-red);
}

/* ===== category legend list ===== */
.legend-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.legend-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.legend-list .legend-amount {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
}

/* ===== misc ===== */
.updated-at {
  text-align: center;
  font-size: 0.74rem;
  color: var(--ink-soft);
  margin: 4px 0 0;
}

.empty-note {
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-align: center;
  padding: 10px 0;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.84rem;
  box-shadow: var(--shadow);
  z-index: 20;
}
.toast[hidden] { display: none; }

@media (prefers-reduced-motion: no-preference) {
  .icon-btn, .card { transition: transform 0.15s ease, box-shadow 0.15s ease; }
}