:root {
  --bg-cream: #F1EBDD;
  --bg-cream-2: #EDE6D6;
  --ink: #1B1A15;
  --ink-soft: #4A4940;
  --accent: #52623B;
  --accent-soft: #A9BB8B;
  --white: #F7F5EE;
  --card-shadow: rgba(27, 26, 21, 0.08);
  --danger: #A5453B;

  --font-serif: "Noto Serif TC", "Songti TC", Georgia, "PMingLiU", serif;
  --font-sans: "Noto Sans TC", "PingFang TC", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

/* 任何有 [hidden] 屬性的元素一律強制隱藏,避免被下面更明確的 class 規則(如 display:flex)蓋掉 */
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-cream);
  color: var(--ink);
  font-family: var(--font-sans);
  position: relative;
  padding-bottom: 48px;
}

/* 紙紋質感,呼應品牌其餘素材 */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.05;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  z-index: 0;
}

.topbar {
  padding: 28px 20px 16px;
  text-align: center;
}
.topbar h1 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 24px;
  margin: 0;
  color: var(--ink);
}
.tagline {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--accent);
  letter-spacing: 0.05em;
  font-size: 13px;
  margin: 6px 0 0;
}

.app-shell {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 16px;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 168px 1fr;
  gap: 20px;
  align-items: start;
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: sticky;
  top: 16px;
}
.nav-item {
  text-align: left;
  background: transparent;
  border: none;
  border-left: 3px solid transparent;
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 12px;
  border-radius: 0 10px 10px 0;
  cursor: pointer;
}
.nav-item.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--bg-cream-2);
}

.content { min-width: 0; }

.view[hidden] { display: none; }

.section-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--ink);
  margin: 22px 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.count-badge {
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--white);
  background: var(--accent);
  border-radius: 999px;
  padding: 1px 8px;
}
.hint-text { color: var(--ink-soft); font-size: 13px; margin: 0 0 12px; }
.history-hint { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--bg-cream-2); }

.currency-breakdown { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.currency-breakdown li {
  display: flex;
  justify-content: space-between;
  background: var(--bg-cream-2);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
}
.currency-breakdown .cur-code { font-weight: 700; color: var(--accent); }

.fab {
  position: fixed;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom));
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  border: none;
  font-size: 26px;
  line-height: 1;
  box-shadow: 0 4px 14px var(--card-shadow);
  cursor: pointer;
  z-index: 15;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stats-row-1 { grid-template-columns: 1fr; max-width: 260px; }
.stats-row-2 { grid-template-columns: repeat(2, 1fr); max-width: 420px; }
.stat-card {
  background: var(--bg-cream-2);
  border-radius: 14px;
  padding: 14px 10px;
  box-shadow: 0 2px 6px var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: center;
}
.stat-label {
  font-size: 11px;
  color: var(--ink-soft);
  line-height: 1.4;
}
.stat-value {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 18px;
  color: var(--accent);
}
.stat-split { font-size: 15px; }

.stats-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}
.currency-toggle { display: flex; gap: 6px; }

.reminder-banner {
  background: var(--accent);
  color: var(--white);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 16px;
}
.reminder-label {
  font-family: var(--font-serif);
  font-style: italic;
  letter-spacing: 0.05em;
  font-size: 13px;
  color: var(--accent-soft);
  display: block;
  margin-bottom: 8px;
}
#reminderList { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
#reminderList li { font-size: 14px; display: flex; justify-content: space-between; }
#reminderList .days { color: var(--accent-soft); font-size: 12px; }

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--ink);
  color: var(--white);
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
}
.btn-primary:active { opacity: 0.85; }

.filter-tabs { display: flex; gap: 6px; }
.list-count {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--ink-soft);
}
.tab {
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-sans);
}
.tab.active { background: var(--accent); color: var(--white); }

.loading, .empty-msg {
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
  padding: 30px 10px;
}

.sub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sub-item {
  background: var(--bg-cream-2);
  border-radius: 14px;
  padding: 14px 16px;
  box-shadow: 0 2px 6px var(--card-shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}
.sub-item.due-soon { border-left: 4px solid var(--accent); }

.list-divider {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 4px 0;
  margin-top: 4px;
  border-top: 1px solid var(--bg-cream-2);
}
.sub-main { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.sub-name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sub-meta { font-size: 12px; color: var(--ink-soft); display: flex; gap: 8px; flex-wrap: wrap; }
.sub-tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 1px 8px;
  white-space: nowrap;
}
.sub-tag-ended {
  color: var(--ink-soft);
  border-color: var(--ink-soft);
}
.sub-amount { text-align: right; flex-shrink: 0; }
.sub-amount .amt { font-family: var(--font-serif); font-weight: 800; font-size: 16px; color: var(--accent); display: block; }
.sub-amount .cur { font-size: 11px; color: var(--ink-soft); }

/* 底部彈出表單 */
.sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(27,26,21,0.45);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 20;
}
.sheet {
  background: var(--bg-cream);
  width: 100%;
  max-width: 560px;
  border-radius: 20px 20px 0 0;
  padding: 22px 20px calc(20px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 88vh;
  overflow-y: auto;
}
.sheet h2 {
  font-family: var(--font-serif);
  margin: 0 0 4px;
  font-size: 19px;
}
.sheet label {
  font-size: 12px;
  color: var(--ink-soft);
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.sheet input, .sheet select, .sheet textarea {
  font-family: var(--font-sans);
  font-size: 15px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--bg-cream-2);
  background: var(--white);
  color: var(--ink);
}
.sheet input:focus, .sheet select:focus, .sheet textarea:focus {
  outline: 2px solid var(--accent-soft);
}
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.sheet-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--ink-soft);
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 10px 16px;
  font-size: 14px;
  cursor: pointer;
}
#btnDelete { border-color: var(--danger); color: var(--danger); margin-right: auto; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--white);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  z-index: 30;
}

@media (max-width: 720px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding: 0 12px;
  }
  .side-nav {
    position: static;
    flex-direction: row;
    overflow-x: auto;
    gap: 6px;
    padding-bottom: 6px;
    margin-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }
  .nav-item {
    flex: 0 0 auto;
    border-left: none;
    border-bottom: 3px solid transparent;
    border-radius: 10px 10px 0 0;
    white-space: nowrap;
    font-size: 13px;
    padding: 8px 12px;
  }
  .nav-item.active { border-bottom-color: var(--accent); }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-cream: #211F19;
    --bg-cream-2: #2A281F;
    --ink: #F1EBDD;
    --ink-soft: #B9B4A4;
    --white: #1B1A15;
    --card-shadow: rgba(0,0,0,0.3);
  }
  .btn-primary { background: var(--accent); }
}