:root {
  --bg: #FAF8F3; --card: #FFFFFF; --text: #1E2933; --text2: #52606D;
  --primary: #20594F; --on-primary: #FFFFFF; --danger: #A12B2B; --border: #AEB9B3;
  --focus: #0B6B91; --ok: #1F6B3A; --warn-bg: #FFF4D6; --warn: #6B4B00;
  --fs: 20px; --lh: 32px; --h1: 28px; --h2: 23px; --small: 17px; --small-lh: 26px;
  --btn-h: 56px; --row-h: 52px; --input-h: 56px;
  --font: system-ui, -apple-system, "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}
html.big {
  --fs: 24px; --lh: 38px; --h1: 32px; --h2: 27px; --small: 20px; --small-lh: 30px;
  --btn-h: 60px; --row-h: 58px; --input-h: 64px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text); font-family: var(--font);
  font-size: var(--fs); line-height: var(--lh);
  padding-bottom: calc(76px + env(safe-area-inset-bottom));
}
body.no-tab { padding-bottom: calc(24px + env(safe-area-inset-bottom)); }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: #fff; padding: 8px; z-index: 99; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.topbar {
  position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 8px; padding: 8px 12px; min-height: 64px;
  padding-top: calc(8px + env(safe-area-inset-top));
}
.topbar h1 { flex: 1; margin: 0; font-size: var(--h1); line-height: 1.35; font-weight: 700; padding-left: 8px; }
.back, .topaction {
  min-height: 52px; min-width: 52px; padding: 0 12px; border: 0; background: transparent;
  color: var(--primary); font: inherit; font-size: var(--fs); font-weight: 600; border-radius: 10px;
}
.back:active, .topaction:active { background: #E8EFEC; }

main { max-width: 680px; margin: 0 auto; padding: 16px 20px 24px; outline: none; }
h2 { font-size: var(--h2); line-height: 1.4; margin: 28px 0 12px; }
p { margin: 0 0 12px; }
.muted { color: var(--text2); font-size: var(--small); line-height: var(--small-lh); }
.lead { font-size: calc(var(--fs) + 2px); margin: 8px 0 20px; }

.btn {
  display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%;
  min-height: var(--btn-h); padding: 10px 18px; margin: 0 0 12px; border-radius: 14px;
  border: 2px solid var(--primary); background: var(--card); color: var(--primary);
  font: inherit; font-weight: 700; text-decoration: none; text-align: center; cursor: pointer;
}
.btn.primary { background: var(--primary); color: var(--on-primary); }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.danger.solid { background: var(--danger); color: #fff; }
.btn.big { min-height: calc(var(--btn-h) + 16px); font-size: calc(var(--fs) + 2px); }
.btn[disabled] { opacity: .55; cursor: default; }
.btn:active:not([disabled]) { transform: translateY(1px); }
.row-btns { display: flex; gap: 12px; }
.row-btns .btn { flex: 1; }
.linkbtn {
  background: none; border: 0; color: var(--primary); font: inherit; font-weight: 600; text-decoration: underline;
  min-height: 48px; padding: 0 4px; cursor: pointer;
}

.card {
  display: block; background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 16px; margin: 0 0 12px; color: inherit; text-decoration: none; min-height: var(--row-h);
}
a.card:active { background: #F1F5F3; }
.card .t { font-weight: 700; display: block; }
.card .meta { color: var(--text2); font-size: var(--small); line-height: var(--small-lh); display: block; }
.card .ex { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-top: 4px; }
.card.selected { border: 3px solid var(--primary); background: #EEF5F2; }

.tag { display: inline-block; font-size: var(--small); line-height: 1.5; padding: 0 8px; border-radius: 6px;
  background: #EEF2F0; color: var(--text2); margin: 2px 4px 2px 0; }
.state-ok { color: var(--ok); }
.state-warn { color: var(--warn); }

label.f { display: block; font-weight: 700; margin: 16px 0 6px; }
label.f .opt { font-weight: 400; color: var(--text2); font-size: var(--small); }
input[type=text], input[type=password], input[type=date], input[type=search], textarea {
  width: 100%; min-height: var(--input-h); padding: 10px 14px; border: 2px solid var(--border);
  border-radius: 12px; background: var(--card); color: var(--text); font: inherit;
}
textarea { min-height: 220px; resize: vertical; line-height: var(--lh); }
textarea.tall { min-height: 360px; }
input:focus, textarea:focus { border-color: var(--focus); outline: none; box-shadow: 0 0 0 3px rgba(11,107,145,.25); }

.notice { background: var(--warn-bg); color: var(--warn); border-radius: 12px; padding: 12px 14px; margin: 0 0 16px;
  font-size: var(--small); line-height: var(--small-lh); }
.notice.ai { background: #E9F1FA; color: #183A5A; font-weight: 700; }
.err { color: var(--danger); font-weight: 600; }
.savebar { font-size: var(--small); line-height: var(--small-lh); color: var(--text2); margin: 8px 0 12px; min-height: 26px; }
.savebar.ok { color: var(--ok); font-weight: 700; }
.savebar.bad { color: var(--danger); font-weight: 700; }

.sticky-actions {
  position: sticky; bottom: 0; background: var(--bg); padding: 12px 0 calc(8px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border); margin-top: 16px;
}
.sticky-actions .btn { margin-bottom: 8px; }

.answer { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px; white-space: pre-wrap; }
.prewrap { white-space: pre-wrap; word-break: break-word; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin: 8px 0 16px; }
.chip { min-height: 52px; padding: 0 18px; border: 2px solid var(--border); border-radius: 26px; background: var(--card);
  font: inherit; color: var(--text); cursor: pointer; }
.chip[aria-pressed=true] { border-color: var(--primary); background: var(--primary); color: #fff; font-weight: 700; }
.seg { display: flex; gap: 10px; }
.seg .chip { flex: 1; }
details.more { margin: 16px 0; }
details.more summary { min-height: 48px; display: flex; align-items: center; color: var(--primary); font-weight: 600; cursor: pointer; }
.empty { text-align: center; color: var(--text2); padding: 32px 8px; }
.spinner { display: inline-block; width: 22px; height: 22px; border: 3px solid #C9D6D0; border-top-color: var(--primary);
  border-radius: 50%; animation: spin 1s linear infinite; vertical-align: -4px; }
@keyframes spin { to { transform: rotate(360deg); } }
.hint-voice { background: #EEF5F2; border-radius: 12px; padding: 12px 14px; font-size: var(--small); line-height: var(--small-lh); margin: 8px 0 0; }
.pad { padding: 20px; }

.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10; display: flex; background: var(--card);
  border-top: 1px solid var(--border); padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a {
  flex: 1; display: flex; align-items: center; justify-content: center; min-height: 64px;
  color: var(--text2); text-decoration: none; font-weight: 600;
}
.tabbar a.on { color: var(--primary); font-weight: 800; box-shadow: inset 0 4px 0 var(--primary); }
.tabbar[hidden] { display: none; }

.status-region {
  position: fixed; left: 16px; right: 16px; bottom: calc(84px + env(safe-area-inset-bottom)); z-index: 30;
  max-width: 640px; margin: 0 auto; pointer-events: none;
}
.status-region .msg {
  background: #1E2933; color: #fff; border-radius: 12px; padding: 14px 16px; font-size: var(--small);
  line-height: var(--small-lh); box-shadow: 0 6px 24px rgba(0,0,0,.18); pointer-events: auto;
}
dialog { border: 0; border-radius: 16px; padding: 20px; max-width: 520px; width: calc(100% - 32px); color: var(--text); }
dialog::backdrop { background: rgba(0,0,0,.4); }
dialog h2 { margin-top: 0; }
@media (min-width: 700px) { body { font-size: var(--fs); } }

/* 助手与对话 */
.aicon { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; margin-right: 10px;
  border-radius: 10px; background: #E3EEEA; color: var(--primary); font-weight: 800; vertical-align: middle; }
.bubble { border-radius: 14px; padding: 12px 14px; margin: 0 0 12px; white-space: pre-wrap; word-break: break-word; }
.bubble .who { display: block; font-size: var(--small); color: var(--text2); font-weight: 700; margin-bottom: 2px; }
.bubble.assistant { background: var(--card); border: 1px solid var(--border); margin-right: 24px; }
.bubble.user { background: #E3EEEA; margin-left: 24px; }