:root {
  --bg: #fdf8f4;
  --card: #ffffff;
  --ink: #4a3f3a;
  --ink-soft: #8c7b72;
  --accent: #c98a7d;
  --accent-dark: #a96a5e;
  --accent-soft: #f3ddd6;
  --gold: #c9a86a;
  --ok: #7fae7f;
  --warn: #d9534f;
  --line: #eee2da;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(120, 90, 75, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

/* ===== Header ===== */
header {
  text-align: center;
  padding: 36px 16px 8px;
}
header h1 { font-size: 1.7rem; letter-spacing: 2px; }
header .subtitle { color: var(--ink-soft); font-size: 0.95rem; margin-top: 4px; }

/* ===== Nav ===== */
nav {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 20px 12px;
  position: sticky;
  top: 0;
  background: rgba(253, 248, 244, 0.95);
  backdrop-filter: blur(6px);
  z-index: 10;
}
nav button {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 9px 20px;
  border-radius: 999px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.15s;
}
nav button:hover { border-color: var(--accent); color: var(--accent-dark); }
nav button.active { background: var(--accent); border-color: var(--accent); color: #fff; }

main { max-width: 860px; margin: 0 auto; padding: 12px 16px 80px; }
.page { display: none; }
.page.active { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 18px;
}
.card h2 { font-size: 1.15rem; margin-bottom: 12px; }
.card h2 .icon { margin-right: 6px; }
.muted { color: var(--ink-soft); font-size: 0.88rem; }

/* ===== Dashboard ===== */
.countdown-num { font-size: 3rem; font-weight: 700; color: var(--accent-dark); }
.countdown-row { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.date-input-row { margin-top: 10px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
input[type="date"], input[type="text"], input[type="number"], select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--ink);
  background: #fff;
}
input:focus, select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.stat {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}
.stat .num { font-size: 1.5rem; font-weight: 700; color: var(--accent-dark); }
.stat .label { font-size: 0.82rem; color: var(--ink-soft); }

.progress-track {
  background: var(--accent-soft);
  border-radius: 999px;
  height: 12px;
  overflow: hidden;
  margin: 8px 0;
}
.progress-fill {
  background: linear-gradient(90deg, var(--accent), var(--gold));
  height: 100%;
  border-radius: 999px;
  transition: width 0.4s ease;
}

.next-tasks li { margin-left: 20px; margin-bottom: 6px; }
.next-tasks .stage-tag {
  font-size: 0.75rem;
  background: var(--accent-soft);
  color: var(--accent-dark);
  border-radius: 6px;
  padding: 1px 7px;
  margin-right: 6px;
  white-space: nowrap;
}

.link-list a {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  text-decoration: none;
  color: var(--ink);
  margin-bottom: 8px;
  transition: all 0.15s;
}
.link-list a:hover { border-color: var(--accent); background: #fffaf7; }
.link-list .link-name { font-weight: 600; color: var(--accent-dark); }
.link-list .link-desc { font-size: 0.85rem; color: var(--ink-soft); }

/* ===== Checklist ===== */
.stage {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 14px;
  overflow: hidden;
}
.stage-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  user-select: none;
}
.stage-header:hover { background: #fffaf7; }
.stage-header .timeframe {
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  border-radius: 999px;
  padding: 3px 12px;
  white-space: nowrap;
}
.stage-header .stage-title { font-weight: 600; flex: 1; }
.stage-header .stage-progress { font-size: 0.82rem; color: var(--ink-soft); white-space: nowrap; }
.stage-header .chevron { transition: transform 0.2s; color: var(--ink-soft); }
.stage.open .chevron { transform: rotate(90deg); }
.stage .stage-bar { height: 4px; }
.stage-body { display: none; padding: 4px 18px 16px; }
.stage.open .stage-body { display: block; }

.check-item {
  display: flex;
  gap: 10px;
  padding: 10px 4px;
  border-bottom: 1px dashed var(--line);
  align-items: flex-start;
}
.check-item:last-child { border-bottom: none; }
.check-item input[type="checkbox"] {
  width: 19px; height: 19px;
  margin-top: 4px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}
.check-item label { cursor: pointer; flex: 1; }
.check-item.done label { color: var(--ink-soft); text-decoration: line-through; }
.check-item .tip {
  display: block;
  font-size: 0.83rem;
  color: var(--gold);
  margin-top: 2px;
}
.check-item.done .tip { display: none; }

.checklist-toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }

/* ===== Buttons ===== */
.btn {
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 0.92rem;
  cursor: pointer;
  font-family: inherit;
}
.btn:hover { background: var(--accent-dark); }
.btn.ghost {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink-soft);
}
.btn.ghost:hover { border-color: var(--accent); color: var(--accent-dark); }
.btn.small { padding: 5px 12px; font-size: 0.85rem; }
.btn.danger-text { background: transparent; color: var(--warn); padding: 4px 8px; }
.btn.danger-text:hover { background: #fdf0ef; }

/* ===== Tables (budget / guests) ===== */
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { padding: 9px 8px; text-align: left; border-bottom: 1px solid var(--line); }
th { color: var(--ink-soft); font-weight: 600; font-size: 0.83rem; }
td input, td select { width: 100%; min-width: 60px; }
td.num-cell { text-align: right; }
.table-wrap { overflow-x: auto; }
.totals-row td { font-weight: 700; border-top: 2px solid var(--accent-soft); }
.over-budget { color: var(--warn); font-weight: 700; }
.under-budget { color: var(--ok); font-weight: 700; }

.add-row-form { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.add-row-form input, .add-row-form select { flex: 1; min-width: 110px; }

/* ===== Guest estimator ===== */
.estimator-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 8px; }
.estimator-grid .field label { display: block; font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 4px; }
.estimator-grid .field input { width: 100%; }
.estimate-result {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 14px 16px;
  margin-top: 10px;
  font-size: 0.95rem;
}
.estimate-result strong { color: var(--accent-dark); font-size: 1.2rem; }

/* ===== Data mgmt ===== */
.data-actions { display: flex; gap: 10px; flex-wrap: wrap; }

footer {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.82rem;
  padding: 20px;
}

@media (max-width: 560px) {
  header h1 { font-size: 1.35rem; }
  .stage-header { flex-wrap: wrap; }
  .countdown-num { font-size: 2.2rem; }
}