:root {
  --ink: #172033;
  --muted: #667085;
  --line: #e7eaf0;
  --surface: #ffffff;
  --soft: #f7f8fc;
  --accent: #5b5ce2;
  --accent-dark: #4445c8;
  --radius: 18px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--soft); line-height: 1.6; }
a { color: inherit; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.hero { background: radial-gradient(circle at 78% 0%, #dfe2ff 0, transparent 32%), linear-gradient(135deg, #f7f8ff 0%, #eef0ff 100%); border-bottom: 1px solid #e3e6f5; }
.nav { display: flex; justify-content: space-between; align-items: center; min-height: 72px; }
.brand { font-weight: 800; text-decoration: none; letter-spacing: -.02em; }
.nav-links { display: flex; gap: 24px; color: var(--muted); font-size: .92rem; }
.nav-links a, .text-link { text-decoration: none; }
.nav-links a:hover, .text-link:hover { color: var(--accent); }
.hero-content { padding: 84px 0 76px; max-width: 820px; }
.eyebrow { margin: 0 0 10px; color: var(--accent); font-size: .76rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.035em; }
h1 { max-width: 760px; margin: 0; font-size: clamp(2.5rem, 6vw, 5.3rem); }
h2 { margin: 0; font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { margin: 0; font-size: 1.25rem; }
.lead { max-width: 620px; margin: 22px 0 0; color: #4c566d; font-size: clamp(1.05rem, 2vw, 1.3rem); }
.hero-actions, .link-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero-actions { margin-top: 32px; }
.primary-button, .secondary-button, .register-button { display: inline-flex; align-items: center; justify-content: center; gap: 4px; border-radius: 999px; font-weight: 750; text-decoration: none; transition: transform .18s ease, background .18s ease; }
.primary-button, .secondary-button { padding: 12px 20px; }
.primary-button { color: #fff; background: var(--accent); box-shadow: 0 10px 24px #5b5ce233; }
.primary-button:hover { background: var(--accent-dark); transform: translateY(-1px); }
.secondary-button { color: var(--ink); background: #fff9; border: 1px solid #d6d9e8; }
.secondary-button:hover { background: #fff; }
.trust-note { margin: 24px 0 0; color: #747e92; font-size: .84rem; }
.main-content { padding: 40px 0 80px; }
.notice { display: flex; gap: 12px; align-items: baseline; padding: 16px 18px; color: #5e6575; background: #fff9e9; border: 1px solid #f2e3ae; border-radius: 12px; font-size: .9rem; }
.notice strong { color: #8b6812; white-space: nowrap; }
.service-group { padding-top: 70px; scroll-margin-top: 24px; }
.section-heading { margin-bottom: 24px; }
.group-description { margin: 10px 0 0; color: var(--muted); }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.service-card { display: flex; flex-direction: column; min-height: 240px; padding: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 28px #202b4d08; }
.card-heading { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.register-button { flex: 0 0 auto; padding: 8px 12px; color: var(--accent-dark); background: #eef0ff; font-size: .83rem; }
.register-button:hover { color: #fff; background: var(--accent); transform: translateY(-1px); }
.details { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; margin-top: 24px; }
.detail { display: grid; gap: 2px; }
.detail span { color: var(--muted); font-size: .75rem; }
.detail strong { font-size: .92rem; font-weight: 650; overflow-wrap: anywhere; }
.note { margin: auto 0 0; padding-top: 18px; color: var(--muted); font-size: .82rem; }
.next-steps { margin-top: 88px; padding: 34px; background: #172033; color: #fff; border-radius: 24px; }
.next-steps h2 { margin-bottom: 12px; }
.next-steps p:not(.eyebrow) { max-width: 650px; color: #c6ccda; }
.link-row { margin-top: 22px; gap: 20px 26px; }
.text-link { color: #cbd0ff; font-weight: 700; }
.footer { display: flex; justify-content: space-between; gap: 16px; padding: 24px 0 40px; color: var(--muted); font-size: .78rem; }

@media (max-width: 780px) {
  .shell { width: min(100% - 28px, 620px); }
  .nav { min-height: 64px; }
  .nav-links { gap: 10px; font-size: .78rem; }
  .nav-links a:nth-child(-n+2) { display: none; }
  .hero-content { padding: 58px 0 54px; }
  h1 { font-size: clamp(2.35rem, 13vw, 4rem); }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: auto; }
  .next-steps { padding: 26px 22px; }
  .footer { flex-direction: column; }
}

.guide-index { padding: 76px 0 72px; }
.guide-index-header { max-width: 760px; margin-bottom: 36px; }
.guide-index-header h1 { margin: 0; font-size: clamp(2.5rem, 6vw, 4.5rem); }
.guide-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.guide-card { display: flex; flex-direction: column; min-height: 226px; padding: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 28px #202b4d08; }
.guide-card h3 { margin: 8px 0 10px; }
.guide-card p:not(.platform) { margin: 0; color: var(--muted); font-size: .9rem; }
.guide-card .text-link { margin-top: auto; padding-top: 20px; color: var(--accent-dark); }
.platform { margin: 0; color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .08em; }
.compact-guide-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); margin-top: 28px; }
.compact-guide-grid .guide-card { min-height: 208px; background: #ffffff10; border-color: #ffffff20; box-shadow: none; }
.compact-guide-grid .guide-card h3 { font-size: 1.05rem; }
.compact-guide-grid .guide-card p:not(.platform) { color: #c6ccda; font-size: .82rem; }
.compact-guide-grid .guide-card .text-link { color: #d8dcff; }
.guide-layout { padding: 44px 0 76px; }
.back-link { display: inline-block; margin-bottom: 26px; color: var(--muted); font-size: .9rem; text-decoration: none; }
.back-link:hover { color: var(--accent); }
.guide-article { max-width: 820px; padding: clamp(24px, 5vw, 54px); background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 12px 36px #202b4d0a; }
.guide-header { padding-bottom: 38px; border-bottom: 1px solid var(--line); }
.guide-header h1 { margin: 0; font-size: clamp(2.3rem, 5vw, 4.1rem); }
.guide-header .lead { margin-top: 16px; }
.guide-content { padding-top: 34px; font-size: 1rem; }
.guide-content h2, .guide-content h3, .guide-content h4 { margin: 42px 0 16px; }
.guide-content h2 { font-size: 1.65rem; }
.guide-content h3 { font-size: 1.28rem; }
.guide-content p, .guide-content li { color: #39445a; }
.guide-content p { margin: 0 0 17px; }
.guide-content ol, .guide-content ul { margin: 0 0 20px; padding-left: 1.45rem; }
.guide-content li { margin: 9px 0; }
.guide-content a { color: var(--accent-dark); font-weight: 650; }
.guide-content code { padding: .12em .35em; background: #eff1f7; border-radius: 5px; font-size: .9em; }
.guide-content blockquote { margin: 22px 0; padding: 13px 17px; border-left: 4px solid #a7a9ff; background: #f5f5ff; border-radius: 0 10px 10px 0; }
.guide-content blockquote p { margin: 0; color: #4b4d8a; }
.guide-content figure { margin: 26px 0; }
.guide-content figure img, .guide-content li img { display: block; max-width: 100%; height: auto; margin: 12px auto; border: 1px solid var(--line); border-radius: 12px; }
.guide-source { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }

@media (max-width: 980px) {
  .compact-guide-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 780px) {
  .guide-grid, .compact-guide-grid { grid-template-columns: 1fr; }
  .guide-index { padding: 52px 0 56px; }
  .guide-article { padding: 24px 20px; border-radius: 18px; }
  .guide-content { font-size: .97rem; }
}