:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #5d6875;
  --line: #d9e0e7;
  --paper: #f6f4ef;
  --white: #ffffff;
  --green: #17735f;
  --blue: #1e5b8f;
  --gold: #b9822c;
  --soft: #e8eef2;
  font-family: "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 0 6vw;
  background: rgba(246, 244, 239, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  border-radius: 8px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

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

main {
  overflow: hidden;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.7fr);
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 8vh 6vw 10vh;
  background:
    linear-gradient(90deg, rgba(23, 33, 43, 0.9) 0%, rgba(23, 33, 43, 0.72) 44%, rgba(23, 33, 43, 0.18) 100%),
    url("https://images.unsplash.com/photo-1520607162513-77705c0f0d4a?auto=format&fit=crop&w=1800&q=82") center/cover;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.12;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.3;
}

.lead {
  max-width: 700px;
  color: #2f3a44;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.75;
}

.hero h1 {
  color: var(--white);
  text-wrap: balance;
}

.hero .eyebrow {
  color: #9dd1c4;
}

.hero .lead {
  color: #e6eef0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary,
.secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 800;
}

.primary {
  background: var(--green);
  color: var(--white);
}

.secondary {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.secondary.dark {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.28);
}

.market-panel {
  position: relative;
  z-index: 1;
  align-self: end;
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 24px 80px rgba(23, 33, 43, 0.2);
  backdrop-filter: blur(12px);
}

.panel-row {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.panel-row:last-child {
  border-bottom: 0;
}

.panel-row span {
  color: var(--muted);
  font-size: 14px;
}

.panel-row strong {
  font-size: 18px;
}

.band,
.split,
.contact,
.disclaimer {
  padding: 82px 6vw;
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-head p:not(.eyebrow),
.contact p,
.card p,
.note p,
.check-item p,
.disclaimer {
  color: var(--muted);
  line-height: 1.75;
}

.compact {
  margin-bottom: 0;
}

.grid {
  display: grid;
  gap: 18px;
}

.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card,
.note {
  display: block;
  min-height: 220px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 32px;
  margin-bottom: 36px;
  border-radius: 6px;
  background: var(--soft);
  color: var(--blue);
  font-weight: 800;
}

.text-link {
  display: inline-flex;
  margin-top: 12px;
  color: var(--blue);
  font-weight: 800;
}

.article-hero {
  min-height: 48vh;
  padding: 96px 6vw 72px;
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.88), rgba(246, 244, 239, 0.78)),
    url("https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?auto=format&fit=crop&w=1800&q=82") center/cover;
}

.article-hero.market {
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.9), rgba(232, 238, 242, 0.76)),
    url("https://images.unsplash.com/photo-1611974789855-9c2a0a7236a3?auto=format&fit=crop&w=1800&q=82") center/cover;
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 820px);
  gap: 48px;
  align-items: start;
  padding: 72px 6vw;
  background: var(--white);
}

.article-layout.single {
  grid-template-columns: minmax(0, 860px);
  justify-content: center;
}

.toc {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 10px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.toc a {
  color: var(--muted);
  font-weight: 700;
}

.toc a:hover,
.post-row:hover strong,
.note:hover h3,
.text-link:hover {
  color: var(--green);
}

.article-body {
  color: #26323d;
  font-size: 18px;
  line-height: 1.85;
}

.article-body h2 {
  margin-top: 0;
  padding-top: 18px;
  font-size: 30px;
}

.article-body ul,
.article-body ol {
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 10px;
}

.post-list {
  display: grid;
  max-width: 980px;
  border-top: 1px solid var(--line);
}

.post-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 8px 28px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.post-row span {
  color: var(--gold);
  font-weight: 800;
}

.post-row strong {
  font-size: 24px;
}

.post-row p {
  grid-column: 2;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.conversion {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 58px 6vw;
  background: var(--white);
  border-top: 1px solid var(--line);
}

.conversion p {
  max-width: 680px;
  color: var(--muted);
  line-height: 1.75;
}

.conversion-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  max-width: 980px;
}

.check-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.check-card h2 {
  font-size: 28px;
}

.check-card label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 0;
  color: #2f3a44;
  line-height: 1.55;
}

.check-card input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--green);
}

.print-button {
  border: 0;
  cursor: pointer;
}

.signup {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: 42px;
  padding: 72px 6vw;
  background: var(--white);
}

.signup-copy,
.signup-panel {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.signup-panel {
  background: var(--ink);
  color: var(--white);
}

.mini-list {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.mini-list p,
.signup-panel p {
  color: var(--muted);
  line-height: 1.75;
}

.signup-panel p {
  color: #c8d1da;
}

.small-note {
  margin-top: 18px;
  font-size: 14px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1fr);
  gap: 48px;
  background: var(--white);
}

.checklist {
  display: grid;
  gap: 18px;
}

.check-item {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 18px;
  padding: 24px;
  border-left: 4px solid var(--gold);
  background: var(--paper);
}

.check-item span {
  width: 14px;
  height: 14px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--green);
}

.muted {
  background: #eef2f0;
}

.note {
  min-height: 190px;
}

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background: var(--ink);
  color: var(--white);
}

.contact p {
  max-width: 720px;
  color: #c8d1da;
}

.contact .eyebrow {
  color: #9dd1c4;
}

.disclaimer {
  background: var(--white);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px 6vw;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 920px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .nav {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero,
  .split,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 58px;
    background:
      linear-gradient(180deg, rgba(23, 33, 43, 0.92) 0%, rgba(23, 33, 43, 0.76) 62%, rgba(23, 33, 43, 0.3) 100%),
      url("https://images.unsplash.com/photo-1520607162513-77705c0f0d4a?auto=format&fit=crop&w=1800&q=82") center/cover;
  }

  .three,
  .four {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact {
    align-items: flex-start;
    flex-direction: column;
  }

  .toc {
    position: static;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .conversion,
  .signup {
    align-items: flex-start;
    flex-direction: column;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .three,
  .four {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 40px;
  }

  .band,
  .split,
  .contact,
  .disclaimer,
  .article-layout,
  .article-hero {
    padding: 62px 5vw;
  }

  .market-panel,
  .card,
  .note {
    padding: 22px;
  }

  footer {
    flex-direction: column;
  }

  .post-row {
    grid-template-columns: 1fr;
  }

  .post-row p {
    grid-column: auto;
  }

  .check-grid {
    grid-template-columns: 1fr;
  }

  .signup-copy,
  .signup-panel,
  .check-card {
    padding: 22px;
  }
}

@media print {
  .topbar,
  footer,
  .print-button {
    display: none;
  }

  body,
  .band,
  .article-hero {
    background: #ffffff;
  }

  .article-hero,
  .band {
    padding: 24px;
  }

  .check-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .check-card {
    break-inside: avoid;
  }
}

/* 面包屑导航 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 14px;
  color: var(--muted);
}

.breadcrumb a:hover {
  color: var(--green);
}

.breadcrumb .sep {
  color: var(--line);
}

.breadcrumb .current {
  color: var(--ink);
  font-weight: 700;
}

/* 目录树 */
.tree {
  max-width: 880px;
}

.tree details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  margin-bottom: 14px;
  overflow: hidden;
}

.tree summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 20px;
  font-weight: 800;
  list-style: none;
}

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

.tree summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  border-radius: 6px;
  background: var(--soft);
  color: var(--green);
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}

.tree details[open] summary::before {
  content: "−";
}

.tree summary::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.tree ul {
  margin: 0;
  padding: 0 24px 16px 60px;
  list-style: none;
}

.tree li {
  position: relative;
  padding: 14px 0;
  border-top: 1px dashed var(--line);
}

.tree li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 24px;
  width: 18px;
  height: 1px;
  background: var(--line);
}

.tree a {
  display: block;
}

.tree a strong {
  display: block;
  font-size: 17px;
  font-weight: 700;
}

.tree a span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.tree a:hover strong {
  color: var(--green);
}

@media (max-width: 620px) {
  .tree summary {
    font-size: 18px;
    padding: 16px 18px;
  }

  .tree ul {
    padding-left: 44px;
  }
}