/* HPI 签证信息站 — mobile-first, no dependencies */

:root {
  --bg:        #fbfaf7;
  --bg-raised: #ffffff;
  --bg-sunk:   #f2f0ea;
  --ink:       #1d1c19;
  --ink-mute:  #5c584f;
  --ink-dim:   #8b8579;
  --rule:      #e2ded4;
  --rule-soft: #edeae2;
  --accent:    #1c5d47;
  --accent-ink:#ffffff;
  --accent-sf: #e4f0ea;
  --warn:      #8a5a12;
  --warn-bg:   #fdf4e2;
  --ok:        #1c5d47;
  --no:        #8f3a34;
  --no-bg:     #fbeceb;
  --radius:    10px;
  --maxw:      880px;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
          -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #16171a;
    --bg-raised: #1e2024;
    --bg-sunk:   #25282d;
    --ink:       #e9e6df;
    --ink-mute:  #a8a49a;
    --ink-dim:   #7d7970;
    --rule:      #33363c;
    --rule-soft: #26292e;
    --accent:    #6cc9a0;
    --accent-ink:#10241c;
    --accent-sf: #1b2f27;
    --warn:      #e0b464;
    --warn-bg:   #2c2519;
    --ok:        #6cc9a0;
    --no:        #e08b83;
    --no-bg:     #2e1e1d;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- header ---------- */
.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--bg-raised);
  position: sticky; top: 0; z-index: 20;
}
.site-head .wrap { display: flex; align-items: center; gap: 14px; min-height: 56px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 16px; color: var(--ink); letter-spacing: -.01em; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand .dot { color: var(--accent); }
.nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a {
  font-size: 14px; color: var(--ink-mute); padding: 5px 10px;
  border-radius: 999px; white-space: nowrap;
}
.nav a:hover { background: var(--bg-sunk); color: var(--ink); text-decoration: none; }
.nav a[aria-current="page"] { background: var(--accent-sf); color: var(--accent); font-weight: 500; }

/* ---------- hero ---------- */
.hero { padding: 40px 0 28px; border-bottom: 1px solid var(--rule-soft); }
.hero h1 { font-size: 29px; line-height: 1.3; margin: 0 0 12px; letter-spacing: -.02em; }
.hero .lede { font-size: 16px; color: var(--ink-mute); margin: 0; max-width: 46em; }

.stamp {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; color: var(--ink-mute); font-family: var(--mono);
  background: var(--bg-sunk); border: 1px solid var(--rule);
  padding: 4px 11px; border-radius: 999px; margin-bottom: 16px;
}
.stamp b { color: var(--ink); font-weight: 600; }

main { padding: 30px 0 64px; }
section { margin: 0 0 40px; }
h2 { font-size: 21px; margin: 40px 0 14px; letter-spacing: -.01em; scroll-margin-top: 70px; }
h3 { font-size: 17px; margin: 26px 0 10px; }
p  { margin: 0 0 14px; }
ul, ol { margin: 0 0 16px; padding-left: 1.35em; }
li { margin: 0 0 7px; }
small { color: var(--ink-dim); }

/* ---------- notices ---------- */
.notice {
  border: 1px solid var(--rule); border-left: 3px solid var(--accent);
  background: var(--bg-raised); border-radius: var(--radius);
  padding: 14px 16px; margin: 0 0 22px; font-size: 14.5px; line-height: 1.7;
}
.notice.warn { border-left-color: var(--warn); background: var(--warn-bg); }
.notice strong { display: block; margin-bottom: 3px; }
.notice p:last-child { margin-bottom: 0; }

/* ---------- eligibility checker ---------- */
.tool {
  border: 1px solid var(--rule); background: var(--bg-raised);
  border-radius: var(--radius); padding: 20px; margin: 0 0 30px;
}
.tool h2 { margin: 0 0 4px; font-size: 19px; }
.tool .hint { font-size: 13.5px; color: var(--ink-dim); margin: 0 0 16px; }
.field { margin: 0 0 14px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; color: var(--ink-mute); }
input[type="text"], input[type="date"], input[type="search"], select {
  width: 100%; font: inherit; font-size: 16px; color: var(--ink);
  background: var(--bg); border: 1px solid var(--rule);
  border-radius: 8px; padding: 10px 12px; appearance: none;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.combo { position: relative; }
.combo-list {
  position: absolute; left: 0; right: 0; top: calc(100% + 4px); z-index: 30;
  background: var(--bg-raised); border: 1px solid var(--rule);
  border-radius: 8px; max-height: 260px; overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
.combo-list button {
  display: block; width: 100%; text-align: left; font: inherit; font-size: 15px;
  background: none; border: 0; border-bottom: 1px solid var(--rule-soft);
  padding: 9px 12px; color: var(--ink); cursor: pointer;
}
.combo-list button:last-child { border-bottom: 0; }
.combo-list button:hover, .combo-list button.active { background: var(--accent-sf); }
.combo-list .cc { color: var(--ink-dim); font-size: 12.5px; margin-left: 6px; }
.combo-list .none { padding: 12px; color: var(--ink-dim); font-size: 14px; }

.result { margin-top: 16px; border-radius: 8px; padding: 15px 16px; font-size: 15px; display: none; }
.result.show { display: block; }
.result.yes { background: var(--accent-sf); border: 1px solid var(--accent); }
.result.no  { background: var(--no-bg); border: 1px solid var(--no); }
.result .verdict { font-weight: 700; font-size: 17px; margin: 0 0 8px; }
.result.yes .verdict { color: var(--ok); }
.result.no  .verdict { color: var(--no); }
.result ul { margin: 8px 0 0; }
.result p:last-child, .result ul:last-child { margin-bottom: 0; }

/* ---------- filter bar ---------- */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin: 0 0 16px; }
.filters .grow { flex: 1 1 220px; }
.filters select { width: auto; min-width: 150px; }
.count { font-size: 13.5px; color: var(--ink-dim); margin: 0 0 12px; font-family: var(--mono); }

/* ---------- university list ---------- */
.uni-group { margin: 0 0 26px; }
.uni-group h3 {
  font-size: 14px; text-transform: uppercase; letter-spacing: .08em;
  color: var(--ink-dim); margin: 0 0 10px; padding-bottom: 7px;
  border-bottom: 1px solid var(--rule-soft); font-weight: 600;
}
.uni-grid { display: grid; grid-template-columns: 1fr; gap: 8px; }
@media (min-width: 620px) { .uni-grid { grid-template-columns: 1fr 1fr; } }
.uni {
  display: block; border: 1px solid var(--rule); background: var(--bg-raised);
  border-radius: 8px; padding: 11px 13px; color: var(--ink);
}
.uni:hover { border-color: var(--accent); text-decoration: none; background: var(--accent-sf); }
.uni .zh { display: block; font-weight: 600; font-size: 15px; line-height: 1.4; }
.uni .en { display: block; font-size: 12.5px; color: var(--ink-dim); line-height: 1.45; margin-top: 2px; }

/* ---------- timeline ---------- */
.tl { list-style: none; margin: 0; padding: 0 0 0 26px; border-left: 2px solid var(--rule); }
.tl li { position: relative; margin: 0 0 26px; padding: 0; }
.tl li::before {
  content: ""; position: absolute; left: -33px; top: 7px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.tl .step { font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: .05em; text-transform: uppercase; }
.tl h3 { margin: 2px 0 6px; font-size: 17px; }
.tl p { margin: 0 0 8px; font-size: 15px; color: var(--ink-mute); }

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 0 20px; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; min-width: 460px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
th { font-weight: 600; color: var(--ink-mute); background: var(--bg-sunk); white-space: nowrap; }
tr:last-child td { border-bottom: 0; }

/* ---------- faq ---------- */
details {
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--bg-raised); padding: 0; margin: 0 0 10px;
}
details summary {
  cursor: pointer; padding: 13px 16px; font-weight: 600; font-size: 15.5px;
  list-style: none; display: flex; justify-content: space-between; gap: 12px;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; color: var(--ink-dim); font-weight: 400; font-size: 19px; line-height: 1; }
details[open] summary::after { content: "−"; }
details .body { padding: 0 16px 15px; font-size: 15px; color: var(--ink-mute); }
details .body p:last-child, details .body ul:last-child { margin-bottom: 0; }

/* ---------- cta ---------- */
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: 11px 20px; border-radius: 8px; font-weight: 600; font-size: 15px;
  border: 0; cursor: pointer; font-family: inherit;
}
.btn:hover { text-decoration: none; opacity: .9; }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0; }

.cards { display: grid; grid-template-columns: 1fr; gap: 12px; margin: 18px 0; }
@media (min-width: 620px) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  border: 1px solid var(--rule); background: var(--bg-raised);
  border-radius: var(--radius); padding: 16px 18px; color: var(--ink);
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 5px; font-size: 16px; }
.card p { margin: 0; font-size: 14px; color: var(--ink-mute); line-height: 1.6; }

/* ---------- footer ---------- */
.site-foot {
  border-top: 1px solid var(--rule); background: var(--bg-raised);
  padding: 26px 0 40px; font-size: 13.5px; color: var(--ink-dim); line-height: 1.7;
}
.site-foot .wrap > p { margin: 0 0 8px; }
.site-foot a { color: var(--ink-mute); }
.foot-nav { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 12px; }

.crumb { font-size: 13px; color: var(--ink-dim); margin: 0 0 10px; }
.crumb a { color: var(--ink-mute); }

@media (min-width: 700px) {
  .hero h1 { font-size: 36px; }
  .hero { padding: 52px 0 34px; }
}

@media print { .site-head, .nav, .tool, .site-foot { display: none; } }