:root {
  --ground: #f5f6f2;
  --paper: #ffffff;
  --ink: #1c2420;
  --muted: #56625b;
  --rule: #d8ded8;
  --accent: #2c6a58;
  --accent-ink: #ffffff;
  --accent-soft: #e2efe9;
  --warn: #7a4d0c;
  --warn-bg: #fbf2e1;
  --bad: #a13a2b;
  --focus: #1f5fbf;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ground: #121614;
    --paper: #1a201d;
    --ink: #e4eae6;
    --muted: #a0aca5;
    --rule: #303a35;
    --accent: #7cc4ad;
    --accent-ink: #0d1411;
    --accent-soft: #1f3530;
    --warn: #e7bd78;
    --warn-bg: #2d2415;
    --bad: #f08c7c;
    --focus: #8db7ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 16px/1.7 "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  padding-inline: 16px;
  padding-block: 0 48px;
}
main, .top, .foot { max-width: 960px; margin-inline: auto; }
a { color: var(--accent); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
h1, h2, h3 { line-height: 1.35; text-wrap: balance; }
h1 { font-size: clamp(22px, 5vw, 30px); margin: 8px 0 12px; }
h2 { font-size: 19px; margin: 20px 0 8px; }
h3 { font-size: 16px; margin: 16px 0 6px; }

.top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; padding-block: 14px; border-bottom: 1px solid var(--rule); }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; }
.top nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; }
.top nav a { text-decoration: none; padding-block: 10px; }
.top nav a[aria-current="page"] { font-weight: 700; border-bottom: 2px solid var(--accent); }
.who { color: var(--muted); font-size: 14px; }
.badge { display: inline-block; min-width: 20px; padding: 0 6px; border-radius: 10px; background: var(--bad); color: #fff; font-size: 12px; text-align: center; }
.foot { margin-top: 40px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--rule); padding-top: 12px; }

.intro p { color: var(--muted); margin: 0 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.count { color: var(--muted); font-size: 14px; }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn.secondary { background: var(--accent-soft); color: var(--ink); border-color: var(--accent-soft); }
.btn.ghost { background: transparent; color: var(--accent); border-color: var(--rule); }
.btn.small { min-height: 36px; padding: 0 12px; font-size: 14px; }
.btn.tiny { min-height: 28px; padding: 0 8px; font-size: 12px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.actions, .form-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.filters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-block: 12px; }
.filters select { min-height: 44px; }
.toggles { display: flex; flex-wrap: wrap; gap: 6px; }
.toggle { display: inline-flex; align-items: center; gap: 4px; padding: 6px 12px; border: 1px solid var(--rule); border-radius: 999px; background: var(--paper); font-size: 14px; }

.cards, .rows { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.card, .row, .panel { background: var(--paper); border: 1px solid var(--rule); border-radius: 10px; padding: 16px; }
.card h2, .row h2 { margin: 4px 0 8px; font-size: 18px; }
.card h2 a, .row h2 a { color: var(--ink); text-decoration: none; }
.card h2 a:hover, .row h2 a:hover { text-decoration: underline; }
.meta { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 0; color: var(--muted); font-size: 13px; }
.meta .deadline { color: var(--ink); font-weight: 600; }
.line { margin: 2px 0; }
.line b { display: inline-block; min-width: 3em; margin-right: 8px; color: var(--muted); font-weight: 600; }
.fit { color: var(--accent); }
.row.attention, .panel.attention { border-color: var(--warn); background: var(--warn-bg); }

.chip { display: inline-flex; gap: 4px; align-items: center; padding: 2px 10px; border-radius: 999px; background: var(--accent-soft); font-size: 13px; font-weight: 600; }
.chip.s-needs_revision { background: var(--warn-bg); color: var(--warn); }
.chip.s-declined, .chip.s-withdrawn, .chip.s-taken_down { background: transparent; border: 1px solid var(--rule); color: var(--muted); }
.flags { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 0; }
.flag { font-size: 13px; color: var(--warn); }

.tabs { display: flex; gap: 4px; overflow-x: auto; padding-bottom: 4px; margin-bottom: 12px; }
.tabs a { flex: none; padding: 8px 12px; border-radius: 999px; text-decoration: none; color: var(--ink); border: 1px solid var(--rule); background: var(--paper); font-size: 14px; }
.tabs a[aria-current="page"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.question .brief { background: var(--paper); border: 1px solid var(--rule); border-radius: 10px; padding: 12px 16px; }
.question dl { display: grid; grid-template-columns: 6em 1fr; gap: 6px 12px; margin: 8px 0 0; }
.question dt { color: var(--muted); font-weight: 600; }
.question dd { margin: 0; }
.question dd p { margin: 0 0 6px; }
.panel.answer { margin-top: 16px; }
fieldset { border: 0; padding: 0; margin: 0 0 16px; min-width: 0; }
legend { font-weight: 700; font-size: 17px; margin-bottom: 8px; }
.stepno { display: none; font-size: 13px; color: var(--muted); margin-right: 8px; font-weight: 600; }
label { display: block; margin: 10px 0 4px; font-weight: 600; font-size: 15px; }
label.opt { display: flex; align-items: flex-start; gap: 8px; font-weight: 400; margin: 6px 0; min-height: 32px; }
label.opt input { margin-top: 5px; }
.opts { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.opts.col { flex-direction: column; }
.label { font-weight: 700; margin: 14px 0 4px; }
input, select, textarea { width: 100%; max-width: 100%; font: inherit; color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 8px; padding: 10px 12px; }
input[type="checkbox"], input[type="radio"] { width: auto; }
select { width: auto; }
textarea { resize: vertical; }
.hint { font-size: 14px; color: var(--muted); margin: 6px 0; }
.hint .good { color: var(--accent); font-weight: 700; }
.hint .bad { color: var(--bad); font-weight: 700; }
.field-error { color: var(--bad); font-size: 14px; margin: 4px 0; }
.notice { padding: 10px 14px; border-radius: 8px; background: var(--accent-soft); margin: 8px 0; }
.notice.warn { background: var(--warn-bg); color: var(--ink); border: 1px solid var(--warn); }
.status-line { margin-top: 0; }

dialog { max-width: min(640px, calc(100vw - 32px)); width: 100%; border: 1px solid var(--rule); border-radius: 12px; background: var(--paper); color: var(--ink); padding: 20px; }
dialog::backdrop { background: rgb(0 0 0 / .45); }
.summary { display: grid; grid-template-columns: 6em 1fr; gap: 4px 12px; }
.summary dt { color: var(--muted); }
.summary dd { margin: 0; overflow-wrap: anywhere; }
.terms { white-space: pre-wrap; font: inherit; font-size: 14px; background: var(--ground); padding: 10px; border-radius: 8px; }
.quote { margin: 8px 0; padding: 8px 14px; border-left: 3px solid var(--accent); font-size: 17px; }
.attrib { margin: 0 0 8px; color: var(--muted); }

.split { display: grid; gap: 12px; }
@media (min-width: 900px) { .split { grid-template-columns: 3fr 2fr; } }
.kv { padding-left: 18px; }
.kv li { margin: 4px 0; overflow-wrap: anywhere; }
.timeline { padding-left: 18px; }
.diff ins { background: var(--accent-soft); text-decoration: none; }
.diff del { color: var(--bad); }
.answer-body p { margin: 0 0 10px; }
.sub { margin: 0 0 8px 26px; }
.quotes li { margin-bottom: 12px; }
.empty { text-align: center; padding: 32px 12px; background: var(--paper); border: 1px dashed var(--rule); border-radius: 10px; }
.scroll { overflow-x: auto; }
table.metrics { border-collapse: collapse; min-width: 480px; width: 100%; background: var(--paper); }
.metrics th, .metrics td { padding: 8px 10px; border-bottom: 1px solid var(--rule); text-align: left; font-variant-numeric: tabular-nums; }
#toast { position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(16px + env(safe-area-inset-bottom, 0px)); max-width: calc(100vw - 32px); background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 8px; z-index: 10; }
body.preview { padding-block: 16px; }

/* 手機：表單分四步，主要按鈕固定在底部 */
@media (max-width: 719px) {
  .stepno { display: inline; }
  .panel.answer .form-actions { position: sticky; bottom: 0; background: var(--paper); padding-block: 10px calc(10px + env(safe-area-inset-bottom, 0px)); margin-inline: -16px; padding-inline: 16px; border-top: 1px solid var(--rule); }
  .question dl { grid-template-columns: 1fr; }
  .question dt { margin-top: 6px; }
}