:root {
  --paper: #F3F5F6;
  --surface: #FFFFFF;
  --ink: #17212B;
  --muted: #5A6672;
  --line: #D3DAE0;
  --stamp: #2D43A6;
  --stamp-soft: #E8EBF8;
  --on-stamp: #FFFFFF;
  --alert: #A5302A;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #11161C;
    --surface: #1A2129;
    --ink: #E6EBEF;
    --muted: #9BA7B3;
    --line: #2D3741;
    --stamp: #93A2EE;
    --stamp-soft: #1F2742;
    --on-stamp: #11161C;
    --alert: #EA857D;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}
.serif, h1, h2, h3, .brand { font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif; }

.wrap { max-width: 680px; margin: 0 auto; padding: 32px 20px 72px; }
.wide { max-width: 960px; }

header.site { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 56px; }
.brand { font-weight: 600; font-size: 18px; color: var(--ink); text-decoration: none; }

h1 { font-weight: 600; font-size: clamp(30px, 6vw, 46px); line-height: 1.3; margin: 0 0 16px; }
h2 { font-weight: 600; font-size: clamp(22px, 4.5vw, 28px); line-height: 1.45; margin: 0 0 10px; }
h3 { font-weight: 600; font-size: 20px; line-height: 1.4; margin: 0 0 4px; }
p { margin: 0 0 16px; }
.lead { color: var(--muted); max-width: 32em; margin-bottom: 40px; }
.muted { color: var(--muted); }

label { display: block; font-weight: 600; margin-bottom: 8px; }
input, select {
  font: inherit; color: inherit; background: var(--surface);
  border: 1.5px solid var(--line); border-radius: 8px; padding: 11px 14px; width: 100%;
}
.code-input { font-size: 22px; letter-spacing: 0.12em; text-transform: uppercase; }
button {
  font: inherit; font-weight: 600; cursor: pointer;
  border: 1.5px solid var(--stamp); border-radius: 8px; padding: 11px 20px;
  background: var(--stamp); color: var(--on-stamp);
}
button.ghost { background: transparent; color: var(--stamp); }
button.small { padding: 4px 10px; font-size: 14px; font-weight: 500; }
button:disabled { opacity: 0.6; cursor: default; }
:focus-visible { outline: 3px solid var(--stamp); outline-offset: 2px; }

.form-row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.form-row > .grow { flex: 1 1 220px; }
.error { color: var(--alert); min-height: 1.75em; margin: 10px 0 0; }

/* 问卷 */
.path { list-style: none; padding: 0; margin: 0 0 32px; font-size: 15px; color: var(--muted); }
.path li { padding: 2px 0; }
.path b { color: var(--ink); font-weight: 600; }
.options { display: grid; gap: 10px; margin-top: 28px; }
.option {
  text-align: left; font-weight: 500;
  background: var(--surface); color: var(--ink); border-color: var(--line); padding: 15px 18px;
}
.option:hover { border-color: var(--stamp); }
.nav { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

/* 结果：签证章 */
.stamp {
  border: 2px dashed var(--stamp); border-radius: 12px;
  background: var(--stamp-soft); padding: 18px 22px; margin: 20px 0;
}
.stamp:nth-of-type(odd) { transform: rotate(-0.6deg); }
.stamp:nth-of-type(even) { transform: rotate(0.5deg); }
.stamp h3 { color: var(--stamp); }
.stamp ul { margin: 8px 0 0; padding-left: 1.2em; }
.stamp p { margin: 0; }
.fine { font-size: 14px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; margin-top: 36px; }

/* 管理后台 */
.table-scroll { overflow-x: auto; margin-top: 16px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { font-weight: 600; color: var(--muted); }
td.code { font-weight: 600; letter-spacing: 0.06em; }
.tag-off { color: var(--alert); }
.new-code {
  margin-top: 16px; padding: 14px 18px; border: 2px dashed var(--stamp); border-radius: 12px; background: var(--stamp-soft);
}
.new-code strong { font-size: 24px; letter-spacing: 0.1em; color: var(--stamp); }
section + section { margin-top: 48px; }
[hidden] { display: none !important; }

@media print {
  .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .stamp { transform: none; background: #fff; }
}