:root {
  --ink: #17211e;
  --muted: #4a564f;
  --navy: #0c1e30;
  --paper: #f3f0e8;
  --line: #e3d9cc;
  --bronze: #6e5733;
  --header: 4.75rem;
  --wrap: 72rem;
  --measure: 40rem;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
}

main { flex: 1; }

img { max-width: 100%; }

h1, h2, h3, .logo-name, .index-list strong {
  font-family: "Newsreader", Georgia, "Noto Serif SC", "Songti SC", serif;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

html[lang="zh-Hans"] h1,
html[lang="zh-Hans"] h2,
html[lang="zh-Hans"] h3,
html[lang="zh-Hans"] .index-list strong {
  font-family: "Noto Serif SC", "Songti SC", "Newsreader", serif;
  letter-spacing: 0;
  line-height: 1.35;
}

h1 { margin: 0; font-size: clamp(2.7rem, 5.8vw, 4.8rem); text-wrap: balance; }
h2 { margin: 0; font-size: clamp(1.7rem, 2.5vw, 2.2rem); }
h3 { margin: 0; font-size: 1.35rem; }

p { margin: 0; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
}

::selection { background: #d9e2ea; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--navy);
  color: var(--paper);
  padding: 0.5rem 0.8rem;
  z-index: 40;
}

.skip:focus { top: 0.6rem; }

.wrap {
  width: min(var(--wrap), calc(100% - 3rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 240, 232, 0.94);
  border-top: 3px solid var(--navy);
  border-bottom: 1px solid var(--line);
}

.header-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: 1.5rem;
  min-height: var(--header);
}

.logo {
  display: grid;
  text-decoration: none;
  line-height: 1.05;
  border-left: 2px solid var(--bronze);
  padding-left: 0.75rem;
}

.logo-name {
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.logo-sub {
  margin-top: 0.15rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bronze);
}

.nav {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.35rem 1.05rem;
}

.nav a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--muted);
  padding: 0.2rem 0;
}

.nav a:hover { color: var(--navy); }

.nav a[aria-current="page"] {
  color: var(--navy);
  box-shadow: inset 0 -1px 0 var(--navy);
}

.end {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.langs {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

.langs a { text-decoration: none; color: var(--muted); }
.langs a[aria-current="true"] { color: var(--navy); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--navy);
  color: var(--navy);
  font: inherit;
  font-size: 0.9rem;
  padding: 0.35rem 0.7rem;
  cursor: pointer;
}

.hero { padding: 5.75rem 0 4.5rem; }

.hero-grid,
.intro-grid,
.band-grid {
  display: grid;
  gap: 2.5rem 4.5rem;
  align-items: end;
}

.hero-grid { grid-template-columns: minmax(0, 1.45fr) minmax(15rem, 0.72fr); }
.intro-grid { grid-template-columns: minmax(0, 1.35fr) minmax(14rem, 0.65fr); align-items: start; }
.band-grid { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); }

.hero-aside { border-top: 1px solid var(--navy); padding-top: 1.15rem; }

.hero-aside ol { list-style: none; margin: 0.4rem 0 0; padding: 0; }

.hero-aside li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
  font-family: "Newsreader", Georgia, "Noto Serif SC", serif;
  font-size: 1.45rem;
  line-height: 1.25;
  color: var(--navy);
}

html[lang="zh-Hans"] .hero-aside li {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: 1.3rem;
}

.hero-aside li span:first-child {
  font-family: "Source Sans 3", "PingFang SC", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--bronze);
}

.lede {
  max-width: 40rem;
  margin-top: 1.5rem;
  font-size: 1.22rem;
  line-height: 1.6;
  color: #24302b;
}

.hero-grid > div > .kicker::before,
.page-hero .kicker::before {
  content: "";
  display: inline-block;
  width: 1.6rem;
  height: 1px;
  margin-right: 0.65rem;
  background: var(--bronze);
  vertical-align: middle;
}

.kicker {
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bronze);
}

html[lang="zh-Hans"] .kicker {
  letter-spacing: 0.18em;
  text-transform: none;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.72rem 1.35rem;
  background: var(--navy);
  color: var(--paper);
  border: 1px solid var(--navy);
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
}

.button:hover { background: #16344c; }

.button.ghost {
  background: transparent;
  color: var(--navy);
}

.button.ghost:hover { background: #efece5; }

.button:disabled { opacity: 0.55; cursor: wait; }

.section { padding: 5.25rem 0; }

.section + .section,
.band + .section { border-top: 1px solid var(--line); }

.section-head { margin-bottom: 1.75rem; }
.section-head p:not(.kicker) { margin-top: 0.85rem; max-width: 40rem; }

.section-head h2 { margin-top: 0.2rem; }

.prose { display: grid; gap: 1rem; max-width: var(--measure); }
.prose a { text-underline-offset: 0.18em; }
.lead { font-size: 1.12rem; }

.audiences {
  display: grid;
  margin: 0.35rem 0 0;
  padding: 0;
  list-style: none;
  max-width: none;
  color: var(--navy);
}

.audiences li {
  padding: 0.72rem 0;
  border-top: 1px solid var(--line);
}

.audiences li:last-child { border-bottom: 1px solid var(--line); }

.intro-grid h2.quiet { margin-top: 0; }

.index-list { list-style: none; margin: 0; padding: 0; }

.index-list a {
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr) auto;
  gap: 0.5rem 1.4rem;
  align-items: start;
  padding: 1.55rem 0.35rem;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

.index-list li:last-child a { border-bottom: 1px solid var(--line); }

.index-list strong {
  display: block;
  font-size: clamp(1.45rem, 2vw, 1.85rem);
  color: var(--navy);
}

.index-list .desc {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
}

.index-list .num { padding-top: 0.45rem; }
.index-list .go {
  color: var(--bronze);
  font-size: 1.2rem;
  align-self: center;
}

.index-list a:hover { background: rgba(12, 30, 48, 0.035); }
.index-list a:hover .num { color: var(--navy); }

.num {
  margin: 0;
  font-family: "Source Sans 3", "PingFang SC", sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--bronze);
}

.band {
  background: var(--navy);
  color: #f4f1ea;
  padding: 5.25rem 0;
}

.band .lede { margin-top: 0; }
.band-grid .actions { margin-top: 1.5rem; }

.band .lede,
.band .kicker { color: #d9d3c7; }

.band .button {
  background: #f4f1ea;
  color: var(--navy);
  border-color: #f4f1ea;
}

.band .button:hover { background: #fff; }

.band :focus-visible { outline-color: #f4f1ea; }

.page-hero { padding: 4.75rem 0 2.5rem; }
.page-hero h1 { max-width: 16em; }
.page-hero .prose { margin-top: 1.75rem; }

h2.quiet {
  font-size: 1.2rem;
  margin: 2.25rem 0 0.55rem;
}

.split h2.quiet { margin-top: 0; }
.afterword { margin-top: 2rem; }

h2.quiet a { text-decoration: none; }
h2.quiet a:hover { text-decoration: underline; text-underline-offset: 0.16em; }

.section.flush { padding-top: 2rem; }

.legal { max-width: 46rem; }
.legal h2 { font-size: 1.55rem; padding-top: 0.85rem; }

.prose a,
.foot-contact a { overflow-wrap: anywhere; }

.split {
  display: grid;
  grid-template-columns: minmax(9rem, 16rem) minmax(0, 1fr);
  gap: 1.25rem 4rem;
  align-items: start;
}

.stack { display: grid; }

.entry {
  padding: 2.85rem 0;
  border-top: 1px solid var(--line);
}

.entry:last-child { border-bottom: 1px solid var(--line); }
.entry h2 { margin-top: 0.35rem; }
.entry .prose { margin-top: 0.85rem; }
.faq-group + .faq-group { margin-top: 2.75rem; }
.faq-group h2 { margin-bottom: 0.35rem; }
.band h2 { max-width: 16em; }

.plain-list,
.steps { list-style: none; margin: 0; padding: 0; }

.plain-list li,
.steps li {
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.steps li {
  display: grid;
  grid-template-columns: 2.75rem minmax(0, 1fr);
  grid-template-areas: "num title" "num body";
  gap: 0.2rem 1rem;
  align-items: start;
}

.steps .num { grid-area: num; padding-top: 0.35rem; }
.steps h3 { grid-area: title; }
.steps li > p:not(.num) { grid-area: body; }

.plain-list li:last-child,
.steps li:last-child { border-bottom: 1px solid var(--line); }

.steps h3 { margin-bottom: 0.35rem; }

.faq { border-top: 1px solid var(--line); }
.faq:last-child { border-bottom: 1px solid var(--line); }

.faq summary {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.15rem 0;
  cursor: pointer;
  list-style: none;
  font-family: "Newsreader", Georgia, "Noto Serif SC", serif;
  font-size: 1.22rem;
  line-height: 1.35;
}

html[lang="zh-Hans"] .faq summary { font-family: "Noto Serif SC", "Songti SC", serif; }

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  font-family: "Newsreader", Georgia, serif;
  color: var(--bronze);
  flex: none;
}

.faq[open] summary::after { content: "–"; }

.faq .answer {
  padding: 0 0 1.15rem;
  max-width: var(--measure);
  color: #24302b;
}

.form { display: grid; gap: 1.15rem; max-width: 34rem; }

.field { display: grid; gap: 0.35rem; }

.field span { font-size: 0.92rem; color: var(--muted); }

.optional { font-style: normal; color: #857c72; }

input,
textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid #c9c1b4;
  background: transparent;
  color: var(--ink);
  font: inherit;
  padding: 0.75rem 0;
  border-radius: 0;
}

input:focus,
textarea:focus { border-bottom-color: var(--navy); }

textarea { min-height: 8.5rem; resize: vertical; }

.form-note { color: var(--muted); font-size: 0.95rem; }
.form-note a { text-underline-offset: 0.16em; }

.form-status:empty { display: none; }
.form.is-ok .form-status { color: #1d4a36; }
.form.is-error .form-status { color: #8a2c2c; }

.hp {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
}

.site-footer {
  background: var(--navy);
  color: #efeae2;
  padding: 4.5rem 0 2.75rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem 3rem;
}

.site-footer a { text-decoration-thickness: 1px; text-underline-offset: 0.18em; }

.site-footer .logo-name { color: #f7f5f0; }
.site-footer .logo-sub { color: #cbbfa8; }
.footer-brand p { margin-top: 0.85rem; color: #d4cdc2; }

.foot-label {
  margin: 0 0 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #cbbfa8;
}

html[lang="zh-Hans"] .foot-label {
  letter-spacing: 0.12em;
  text-transform: none;
}

.foot-links,
.foot-contact { display: grid; gap: 0.35rem; margin: 0; padding: 0; list-style: none; }

.disclaimer {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  color: #d4cdc2;
  max-width: 46rem;
  font-size: 0.95rem;
}

.contact-grid,
.form-layout {
  display: grid;
  gap: 2.5rem;
}

.email-list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
}

.email-list a { text-underline-offset: 0.18em; }

@media (min-width: 900px) {
  .contact-grid,
  .form-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1fr);
    align-items: start;
  }
}

@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; flex: none; }
  .header-bar { grid-template-columns: minmax(0, 1fr) auto; column-gap: 0.7rem; }
  .logo { min-width: 0; }
  .end { gap: 0.45rem; }
  .nav {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    padding: 0.35rem 0 1rem;
  }
  .nav.is-open { display: flex; }
  .nav a { padding: 0.45rem 0; }
  .hero { padding: 3.25rem 0 2.5rem; }
  .hero-grid,
  .intro-grid,
  .band-grid { grid-template-columns: 1fr; gap: 2rem; }
  .section, .band { padding: 3.25rem 0; }
  .split { grid-template-columns: 1fr; gap: 0.8rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .index-list a { grid-template-columns: 2.4rem minmax(0, 1fr); }
  .index-list .go { display: none; }
}

@media (max-width: 640px) {
  .wrap { width: min(var(--wrap), calc(100% - 2rem)); }
  h1 { font-size: 2.35rem; }
  .actions { align-items: stretch; }
  .actions .button,
  .form .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}