/* ==========================================================================
   Sunderland China MBA Alumni Association — Design System v2
   Editorial / British academic. Ink navy + ivory paper + lime highlighter.
   ========================================================================== */

:root {
  --ink: #0a2540;
  --ink-soft: #123a5e;
  --ink-70: rgba(10, 37, 64, 0.7);
  --blue: #0069fa;
  --lime: #cfff75;
  --spark: #ff7533;
  --paper: #fbfaf7;
  --paper-2: #f2f0e9;
  --paper-3: #e9e6dc;
  --line: #ddd9cd;
  --line-strong: #c6c1b2;
  --muted: #5c6b7a;
  --white: #ffffff;

  --serif: "Noto Serif SC", "Noto Serif CJK SC", "Songti SC", Georgia, "Times New Roman", serif;
  --sans: "Noto Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", "Roboto Mono", Menlo, Consolas, monospace;

  --w: 1200px;
  --r-s: 2px;
  --r-m: 4px;
  --r-l: 8px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.01em;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

.wrap { width: 100%; max-width: var(--w); margin: 0 auto; padding: 0 40px; }

/* ---------- Type ---------- */
.eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--line-strong);
  display: inline-block;
}
.eyebrow.on-dark { color: rgba(251, 250, 247, 0.55); }
.eyebrow.on-dark::before { background: rgba(251, 250, 247, 0.3); }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  line-height: 1.16;
  text-wrap: balance;
}

.h-display { font-size: clamp(42px, 5.4vw, 72px); line-height: 1.1; }
.h2 { font-size: clamp(30px, 3.4vw, 42px); line-height: 1.22; }
.h3 { font-size: 22px; line-height: 1.4; }
.h4 { font-size: 17px; line-height: 1.5; font-weight: 600; }

.lede { font-size: 17px; line-height: 1.9; color: var(--ink-70); }
.small { font-size: 13px; line-height: 1.8; color: var(--muted); }
.mono { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; }

.mark { background: linear-gradient(transparent 58%, var(--lime) 58%, var(--lime) 94%, transparent 94%); padding: 0 2px; }

/* ---------- Buttons ---------- */
.btn {
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 50px;
  padding: 0 26px;
  border-radius: var(--r-s);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: transform 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
}
.btn:hover { transform: translateY(-2px); background: #0d3057; }
.btn .arw { transition: transform 0.3s var(--ease); }
.btn:hover .arw { transform: translateX(4px); }

.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn.ghost:hover { border-color: var(--ink); background: transparent; }

.btn.lime { background: var(--lime); border-color: var(--lime); color: var(--ink); }
.btn.lime:hover { background: #d9ff8f; }

.btn.block { width: 100%; justify-content: center; }
.btn.sm { height: 42px; padding: 0 18px; font-size: 13px; }

.link-arw {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 3px;
  transition: border-color 0.25s, gap 0.25s;
}
.link-arw:hover { border-color: var(--ink); gap: 14px; }

/* ---------- Top notice ---------- */
.topbar {
  background: var(--ink);
  color: rgba(251, 250, 247, 0.72);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.topbar .wrap { display: flex; justify-content: space-between; align-items: center; height: 38px; }
.topbar .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--lime); display: inline-block; margin-right: 8px; }
.topbar a { color: rgba(251, 250, 247, 0.72); }
.topbar a:hover { color: var(--white); }

/* ---------- Header ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header .wrap { display: flex; align-items: center; justify-content: space-between; height: 84px; gap: 32px; }

.brand { display: flex; align-items: center; gap: 14px; }
.brand-logo { height: 40px; width: auto; max-width: 70vw; display: block; object-fit: contain; }
.footer .brand-logo { height: 42px; }
.crest {
  width: 42px; height: 42px; flex: none;
  border: 1px solid var(--ink);
  border-radius: 50%;
  display: grid; place-items: center;
  position: relative;
}
.crest::before {
  content: ""; position: absolute; inset: 4px; border: 1px solid var(--line-strong); border-radius: 50%;
}
.crest span { font-family: var(--serif); font-size: 15px; font-weight: 600; letter-spacing: -0.02em; }
.brand-txt .zh { font-family: var(--serif); white-space: nowrap; font-size: 15.5px; font-weight: 600; letter-spacing: 0.02em; line-height: 1.3; }
.brand-txt .en { font-size: 9px; letter-spacing: 0.13em; white-space: nowrap; text-transform: uppercase; color: var(--muted); margin-top: 3px; }

.nav { display: flex; align-items: center; gap: 26px; }
.nav a {
  font-size: 14px;
  color: var(--ink-70);
  white-space: nowrap;
  position: relative;
  padding: 4px 0;
  transition: color 0.2s;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--ink); transition: width 0.3s var(--ease);
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a:hover::after, .nav a[aria-current="page"]::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 12px; }
.burger { display: none; }

/* ---------- Hero ---------- */
.hero { padding: 92px 0 0; position: relative; overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: 1fr 400px; gap: 72px; align-items: center; }

.hero h1 { margin: 22px 0 0; }
.hero .lede { margin: 26px 0 0; max-width: 30em; }
.hero-actions { display: flex; align-items: center; gap: 14px; margin-top: 38px; flex-wrap: wrap; }
.hero-note {
  margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; gap: 26px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--muted);
}
.hero-note span { display: inline-flex; align-items: center; gap: 7px; }
.hero-note i { width: 4px; height: 4px; background: var(--spark); border-radius: 50%; display: inline-block; }

/* record card */
.record {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line-strong);
  padding: 26px 24px 20px;
  transform: rotate(-1.4deg);
  box-shadow: 18px 22px 0 -1px var(--paper-2), 0 30px 60px -30px rgba(10, 37, 64, 0.35);
}
.record::after {
  content: ""; position: absolute; inset: 8px; border: 1px solid rgba(10, 37, 64, 0.08); pointer-events: none;
}
.record-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.record-kicker { font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); line-height: 1.7; }
.record-seal {
  width: 46px; height: 46px; border-radius: 50%; flex: none;
  border: 1px solid var(--ink);
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 8px; letter-spacing: 0.08em; line-height: 1.3; text-align: center;
}
.record-title { font-family: var(--serif); font-size: 20px; font-weight: 600; margin-top: 22px; }
.record-name { font-family: var(--serif); font-size: 34px; letter-spacing: 0.12em; margin-top: 14px; }
.record-rows { margin-top: 20px; border-top: 1px solid var(--line); }
.record-row { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.record-row dt { color: var(--muted); }
.record-row dd { margin: 0; font-family: var(--mono); font-size: 11px; letter-spacing: 0.02em; }
.record-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; }
.record-foot .sig { font-size: 9px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  height: 22px; padding: 0 9px; border-radius: 999px;
  font-size: 10.5px; letter-spacing: 0.08em;
  background: var(--ink); color: var(--paper);
}
.pill.lime { background: var(--lime); color: var(--ink); }
.pill.line { background: transparent; border: 1px solid var(--line-strong); color: var(--muted); }
.pill .sdot { width: 5px; height: 5px; border-radius: 50%; background: currentColor; }

/* ---------- Stats ---------- */
.stats { margin-top: 84px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats .wrap { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 32px 0; border-left: 1px solid var(--line); padding-left: 30px; }
.stat:first-child { border-left: 0; padding-left: 0; }
.stat .num { font-family: var(--serif); font-size: 40px; line-height: 1; letter-spacing: -0.02em; }
.stat .num sup { font-size: 13px; letter-spacing: 0; margin-left: 3px; top: -14px; }
.stat .lb { font-size: 12.5px; color: var(--muted); margin-top: 10px; letter-spacing: 0.04em; }

/* ---------- Section shell ---------- */
.sec { padding: 110px 0; }
.sec.tight { padding: 80px 0; }
.sec.paper2 { background: var(--paper-2); }
.sec.ink { background: var(--ink); color: var(--paper); }
.sec.ink .lede { color: rgba(251, 250, 247, 0.62); }

.sec-head { display: grid; grid-template-columns: 1fr 380px; gap: 60px; align-items: end; margin-bottom: 56px; }
.sec-head .h2 { margin-top: 20px; }
.sec-head .lede { font-size: 15.5px; }
.sec-head.no-aside { grid-template-columns: 1fr; }

/* ---------- Path cards ---------- */
.paths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.path {
  background: var(--paper);
  padding: 36px 32px 32px;
  position: relative;
  transition: background 0.35s var(--ease);
  display: flex; flex-direction: column; gap: 14px;
  min-height: 272px;
}
.path:hover { background: var(--white); }
.path .idx { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.1em; }
.path h3 { font-size: 23px; margin-top: auto; }
.path p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.75; }
.path .go { display: flex; align-items: center; justify-content: space-between; margin-top: 18px; font-size: 12.5px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--ink); }
.path .go .tag { font-family: var(--mono); font-size: 10px; color: var(--muted); }
.path:hover .go .arw { transform: translateX(5px); }
.path .arw { transition: transform 0.3s var(--ease); }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 80px; }
.statement { font-family: var(--serif); font-size: clamp(24px, 2.4vw, 31px); line-height: 1.55; letter-spacing: -0.01em; }
.statement em { font-style: normal; -webkit-box-decoration-break: clone; box-decoration-break: clone; background: linear-gradient(transparent 62%, var(--lime) 62%, var(--lime) 96%, transparent 96%); }
.principles { margin-top: 40px; }
.principle { display: grid; grid-template-columns: 46px 1fr; gap: 20px; padding: 24px 0; border-top: 1px solid var(--line); }
.principle:last-child { border-bottom: 1px solid var(--line); }
.principle .pn { font-family: var(--mono); font-size: 11px; color: var(--muted); padding-top: 4px; }
.principle h4 { font-family: var(--sans); font-size: 15px; font-weight: 600; margin-bottom: 6px; letter-spacing: 0.02em; }
.principle p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.8; }

.gov-card { background: var(--white); border: 1px solid var(--line); padding: 34px 32px; }
.gov-card .gov-head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.gov-list { margin-top: 6px; }
.gov-row { display: grid; grid-template-columns: 1fr auto; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); align-items: center; }
.gov-row:last-child { border-bottom: 0; padding-bottom: 0; }
.gov-row .nm { font-size: 14.5px; font-weight: 500; }
.gov-row .rl { font-size: 12px; color: var(--muted); margin-top: 2px; }
.gov-row .ini { width: 34px; height: 34px; border-radius: 50%; background: var(--paper-2); display: grid; place-items: center; font-family: var(--serif); font-size: 13px; }

/* ---------- Membership ---------- */
.mem-wrap { display: grid; grid-template-columns: 1fr 330px; gap: 56px; align-items: start; }
.mem-table { border-top: 1px solid var(--line-strong); }
.mem-row {
  display: grid;
  grid-template-columns: 220px 1fr 168px;
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.mem-row.head {
  padding: 14px 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  font-weight: 500;
  color: var(--ink-70);
  border-bottom: 1px solid var(--line-strong);
}
.mem-row .cat .zh { font-family: var(--serif); font-size: 19px; font-weight: 600; }
.mem-row .cat .en { font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-top: 5px; }
.mem-row .qual { font-size: 13.5px; line-height: 1.85; color: var(--ink-70); }
.mem-row .qual .proof { display: block; margin-top: 8px; font-size: 12px; color: var(--muted); }
.mem-row .fee { text-align: right; }
.mem-row .fee .amt { font-family: var(--serif); font-size: 17px; }
.mem-row .fee .note { font-size: 11px; color: var(--muted); margin-top: 6px; line-height: 1.6; }

.honor {
  margin-top: 22px; padding: 20px 24px; background: var(--paper-2);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  border-left: 2px solid var(--line-strong);
}
.honor p { margin: 0; font-size: 12.5px; color: var(--muted); line-height: 1.7; }
.honor strong { font-family: var(--serif); font-size: 15px; color: var(--ink); font-weight: 600; display: block; margin-bottom: 4px; }

.rights { background: var(--ink); color: var(--paper); padding: 34px 30px; }
.rights h3 { font-size: 19px; }
.rights .rlist { margin-top: 22px; }
.rights .ritem { padding: 16px 0; border-top: 1px solid rgba(251, 250, 247, 0.14); display: grid; grid-template-columns: 22px 1fr; gap: 12px; }
.rights .ritem .n { font-family: var(--mono); font-size: 10px; color: rgba(251, 250, 247, 0.45); padding-top: 3px; }
.rights .ritem h4 { font-size: 14.5px; font-family: var(--sans); font-weight: 500; }
.rights .ritem p { margin: 4px 0 0; font-size: 12px; color: rgba(251, 250, 247, 0.55); line-height: 1.7; }
.rights .fine { margin-top: 22px; font-size: 10.5px; line-height: 1.7; color: rgba(251, 250, 247, 0.4); }

/* ---------- Events ---------- */
.events { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ev {
  background: var(--white); border: 1px solid var(--line);
  padding: 26px 24px; display: flex; flex-direction: column; min-height: 300px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s;
}
.ev:hover { transform: translateY(-4px); box-shadow: 0 24px 48px -32px rgba(10, 37, 64, 0.5); }
.ev-top { display: flex; justify-content: space-between; align-items: center; }
.ev-date { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.04em; }
.ev h3 { font-size: 20px; margin: 22px 0 10px; }
.ev p { margin: 0; font-size: 12.8px; color: var(--muted); line-height: 1.8; }
.ev .meta { margin-top: auto; padding-top: 18px; border-top: 1px solid var(--line); font-size: 11.5px; color: var(--muted); display: flex; flex-direction: column; gap: 6px; }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--line-strong); margin-top: 10px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer; padding: 24px 40px 24px 0; position: relative;
  font-family: var(--serif); font-size: 18px; font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 22px; font-family: var(--sans); font-size: 20px; font-weight: 300; color: var(--muted);
}
.faq details[open] summary::after { content: "−"; }
.faq .ans { padding: 0 90px 26px 0; font-size: 14px; color: var(--ink-70); line-height: 1.95; }

/* ---------- CTA ---------- */
.cta { background: var(--ink); color: var(--paper); padding: 96px 0; position: relative; overflow: hidden; }
.cta .wrap { display: grid; grid-template-columns: 1fr auto; gap: 60px; align-items: end; }
.cta h2 { font-size: clamp(32px, 4vw, 52px); }
.cta h2 .mk { color: var(--lime); }
.cta p { margin: 20px 0 0; font-size: 14.5px; color: rgba(251, 250, 247, 0.6); max-width: 34em; line-height: 1.9; }
.cta-actions { display: flex; flex-direction: column; gap: 12px; min-width: 240px; }
.cta .btn.lime:hover { background: #fff; }

/* ---------- Footer ---------- */
.footer { background: var(--paper-2); padding: 70px 0 30px; }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 56px; }
.footer .brand-txt .zh { font-size: 15px; }
.footer h5 { font-family: var(--sans); font-size: 13px; letter-spacing: 0.04em; text-transform: none; color: var(--ink); margin: 0 0 18px; font-weight: 600; }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 12px; font-size: 13.5px; color: var(--ink-70); }
.footer li a:hover { color: var(--ink); }
.footer .status { margin-top: 26px; display: inline-flex; align-items: center; gap: 8px; font-size: 11.5px; color: var(--muted); border: 1px solid var(--line-strong); padding: 7px 12px; }
.footer .status .d { width: 5px; height: 5px; border-radius: 50%; background: var(--spark); }
.footer-bottom {
  margin-top: 56px; padding-top: 22px; border-top: 1px solid var(--line-strong);
  display: flex; justify-content: space-between; gap: 24px; font-size: 11.5px; color: var(--muted); line-height: 1.8;
}

/* ---------- Page head (inner pages) ---------- */
.page-head { padding: 72px 0 56px; border-bottom: 1px solid var(--line); }
.page-head .breadcrumb { font-size: 11.5px; color: var(--muted); letter-spacing: 0.06em; margin-bottom: 26px; }
.page-head .breadcrumb a:hover { color: var(--ink); }
.page-head h1 { font-size: clamp(34px, 4vw, 52px); margin-top: 18px; }
.page-head .lede { margin-top: 20px; max-width: 44em; }

/* ---------- Stepper ---------- */
.stepper { display: flex; align-items: center; gap: 0; margin: 40px 0 36px; }
.step { display: flex; align-items: center; gap: 12px; }
.step .bn {
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--line-strong); font-family: var(--mono); font-size: 11px; color: var(--muted);
  background: var(--paper);
}
.step.done .bn { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.step.now .bn { border-color: var(--ink); color: var(--ink); box-shadow: 0 0 0 4px rgba(10, 37, 64, 0.06); }
.step .sl { font-size: 13px; color: var(--muted); }
.step.done .sl, .step.now .sl { color: var(--ink); }
.step-line { flex: 1; height: 1px; background: var(--line-strong); margin: 0 18px; }

/* ---------- Form ---------- */
.form-layout { display: grid; grid-template-columns: 1fr 340px; gap: 64px; align-items: start; padding: 56px 0 100px; }
.card { background: var(--white); border: 1px solid var(--line); }
.card + .card { margin-top: 18px; }
.card-head { padding: 26px 30px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.card-head .t { font-family: var(--serif); font-size: 19px; font-weight: 600; }
.card-head .s { font-size: 12.5px; color: var(--muted); margin-top: 6px; line-height: 1.7; }
.card-body { padding: 28px 30px 32px; }

.opt-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.opt {
  border: 1px solid var(--line); padding: 18px 16px; cursor: pointer; background: var(--paper);
  transition: border-color 0.2s, background 0.2s; position: relative;
}
.opt:hover { border-color: var(--line-strong); background: var(--white); }
.opt.on { border-color: var(--ink); background: var(--white); box-shadow: inset 0 0 0 1px var(--ink); }
.opt .t { font-size: 14px; font-weight: 500; }
.opt .d { font-size: 11.5px; color: var(--muted); margin-top: 6px; line-height: 1.6; }
.opt .chk {
  position: absolute; top: 14px; right: 14px; width: 15px; height: 15px; border: 1px solid var(--line-strong);
  border-radius: 50%; display: grid; place-items: center;
}
.opt.on .chk { background: var(--ink); border-color: var(--ink); }
.opt.on .chk::after { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--lime); }

.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 22px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 12.5px; color: var(--ink-70); letter-spacing: 0.02em; }
.field label .req { color: var(--spark); margin-left: 3px; }
.field input, .field select, .field textarea {
  height: 46px; border: 1px solid var(--line-strong); background: var(--paper);
  padding: 0 14px; font-family: var(--sans); font-size: 14px; color: var(--ink);
  border-radius: var(--r-s); outline: none; transition: border-color 0.2s, background 0.2s;
  width: 100%;
}
.field textarea { height: 96px; padding: 12px 14px; resize: vertical; line-height: 1.7; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); background: var(--white); }
.field .hint { font-size: 11.5px; color: var(--muted); }
.field input::placeholder, .field textarea::placeholder { color: #a3aeb8; }

.drop {
  border: 1px dashed var(--line-strong); padding: 34px 24px; text-align: center; background: var(--paper);
  transition: border-color 0.2s, background 0.2s;
}
.drop:hover { border-color: var(--ink); background: var(--white); }
.drop .ic { font-family: var(--serif); font-size: 22px; color: var(--muted); }
.drop .t { font-size: 13.5px; margin-top: 10px; }
.drop .d { font-size: 11.5px; color: var(--muted); margin-top: 6px; }

.uploaded { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1px solid var(--line); background: var(--paper); margin-top: 12px; }
.uploaded .fi { width: 34px; height: 34px; background: var(--paper-3); display: grid; place-items: center; font-family: var(--mono); font-size: 9px; }
.uploaded .nm { font-size: 13px; }
.uploaded .hx { font-family: var(--mono); font-size: 10px; color: var(--muted); margin-top: 3px; }
.uploaded .ok { margin-left: auto; font-size: 10.5px; color: #1f7a4d; display: flex; align-items: center; gap: 5px; }

.consent { display: flex; gap: 12px; padding: 16px 0; border-top: 1px solid var(--line); }
.consent:first-of-type { border-top: 0; }
.cbox { width: 17px; height: 17px; border: 1px solid var(--line-strong); border-radius: 2px; flex: none; margin-top: 4px; background: var(--paper); }
.cbox.on { background: var(--ink); border-color: var(--ink); position: relative; }
.cbox.on::after { content: ""; position: absolute; left: 5px; top: 2px; width: 5px; height: 9px; border: solid var(--lime); border-width: 0 1.5px 1.5px 0; transform: rotate(42deg); }
.consent p { margin: 0; font-size: 12.5px; color: var(--ink-70); line-height: 1.8; }
.consent a { border-bottom: 1px solid var(--line-strong); }

.notice {
  background: var(--ink); color: var(--paper); padding: 22px 22px 24px;
}
.notice h5 { font-family: var(--sans); font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--lime); margin: 0 0 12px; font-weight: 500; }
.notice p { margin: 0; font-size: 12px; line-height: 1.85; color: rgba(251, 250, 247, 0.68); }
.rail { position: sticky; top: 110px; display: flex; flex-direction: column; gap: 16px; }
.rail-card { background: var(--white); border: 1px solid var(--line); padding: 24px 22px; }
.rail-card h5 { font-family: var(--sans); font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); margin: 0 0 14px; font-weight: 500; }
.rail-card p { margin: 0 0 14px; font-size: 12.5px; color: var(--ink-70); line-height: 1.8; }
.rail-steps { list-style: none; margin: 0; padding: 0; }
.rail-steps li { display: grid; grid-template-columns: 18px 1fr; gap: 10px; font-size: 12px; color: var(--muted); padding: 9px 0; border-top: 1px solid var(--line); line-height: 1.7; }
.rail-steps li:first-child { border-top: 0; }
.rail-steps .n { font-family: var(--mono); font-size: 10px; color: var(--ink); }

/* ---------- Track ---------- */
.track-shell { padding: 56px 0 100px; display: grid; grid-template-columns: 340px 1fr; gap: 56px; align-items: start; }
.query-card { background: var(--white); border: 1px solid var(--line); padding: 30px 28px; }
.query-card h3 { font-size: 19px; margin-bottom: 8px; }
.query-card .s { font-size: 12.5px; color: var(--muted); line-height: 1.8; margin: 0 0 24px; }
.query-card .field + .field { margin-top: 16px; }

.result { background: var(--white); border: 1px solid var(--line); }
.result-head { padding: 30px 32px; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; }
.result-head .no { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: 0.06em; }
.result-head h2 { font-size: 26px; margin-top: 12px; }
.result-head .sub { font-size: 13px; color: var(--muted); margin-top: 8px; }

.tl-steps { display: grid; grid-template-columns: repeat(3, 1fr); padding: 30px 32px; border-bottom: 1px solid var(--line); gap: 0; }
.tl { position: relative; padding-top: 26px; }
.tl::before { content: ""; position: absolute; top: 7px; left: 0; right: 0; height: 1px; background: var(--line-strong); }
.tl:last-child::before { right: 50%; }
.tl .dotp { position: absolute; top: 0; left: 0; width: 15px; height: 15px; border-radius: 50%; background: var(--paper); border: 1px solid var(--line-strong); }
.tl.ok .dotp { background: var(--ink); border-color: var(--ink); }
.tl.now .dotp { background: var(--lime); border-color: var(--ink); box-shadow: 0 0 0 4px rgba(207, 255, 117, 0.4); }
.tl .n { font-family: var(--mono); font-size: 10px; color: var(--muted); }
.tl .t { font-size: 13.5px; margin-top: 6px; font-weight: 500; }
.tl .d { font-size: 11.5px; color: var(--muted); margin-top: 4px; }

.log { padding: 8px 32px 26px; }
.log h4 { font-family: var(--sans); font-size: 10.5px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); font-weight: 500; padding: 24px 0 12px; }
.log-row { display: grid; grid-template-columns: 130px 90px 1fr; gap: 20px; padding: 14px 0; border-top: 1px solid var(--line); font-size: 12.5px; align-items: baseline; }
.log-row .ts { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.log-row .who { font-size: 12px; color: var(--ink-70); }
.log-row .what { color: var(--ink-70); }
.log-row .what b { font-weight: 500; color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .wrap { padding: 0 28px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 48px; }
  .record { max-width: 380px; }
  .about-grid, .mem-wrap, .form-layout, .track-shell { grid-template-columns: 1fr; gap: 40px; }
  .sec-head { grid-template-columns: 1fr; gap: 24px; }
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
  .stat { border-left: 0; padding-left: 0; }
  .stat:nth-child(odd) { border-right: 1px solid var(--line); padding-right: 16px; }
  .paths, .events { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .nav { display: none; }
  .burger { display: inline-flex; }
  .cta .wrap { grid-template-columns: 1fr; align-items: start; }
  .rail { position: static; }
  .mem-row { grid-template-columns: 1fr; gap: 12px; }
  .mem-row .fee { text-align: left; }
  .mem-row.head { display: none; }
  .field-grid { grid-template-columns: 1fr; }
  .opt-grid { grid-template-columns: 1fr; }
  .tl-steps { grid-template-columns: 1fr; gap: 24px; }
  .tl::before { display: none; }
  .log-row { grid-template-columns: 1fr; gap: 4px; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .sec { padding: 72px 0; }
  .hero { padding-top: 56px; }
  .header .wrap { height: 68px; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .hero-actions .btn { flex: 1; justify-content: center; }
}

@media (max-width: 640px) {
  .brand-txt .en { display: none; }
  .brand-txt .zh { font-size: 13.5px; letter-spacing: 0; }
  .crest { width: 34px; height: 34px; }
  .crest span { font-size: 12px; }
  .header-actions .btn.ghost { display: none; }
  .header .wrap { gap: 12px; }
  .hero-note { gap: 14px; font-size: 11.5px; }
  .record { padding: 22px 18px 16px; }
  .topbar .wrap { font-size: 10.5px; }
  .topbar a { display: none; }
}