:root {
  color-scheme: light;
  --ink: #171b2b;
  --muted: #59647a;
  --line: #e0e5ee;
  --surface: #f6f8fc;
  --purple: #5236d2;
  --purple-dark: #4126ae;
  --purple-soft: #f1eeff;
  --green: #176450;
  --mint: #ecfaf4;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: #fff;
  color: var(--ink);
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
p { line-height: 1.65; }
a:focus-visible, summary:focus-visible { outline: 3px solid #745ff0; outline-offset: 4px; }
.container { width: min(1120px, calc(100% - 56px)); margin-inline: auto; }
.skip-link { position: absolute; top: 8px; left: 12px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 8px; z-index: 10; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.announcement {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 8px 16px;
  background: var(--mint);
  color: #174f43;
  border-bottom: 1px solid #d0eee0;
  font-size: 13px;
  line-height: 1.45;
}
.announcement a { margin-left: 5px; color: #155746; font-weight: 750; white-space: nowrap; }
.announcement a:hover { text-decoration: underline; }
.status-dot { width: 8px; height: 8px; flex: none; background: #23966e; border-radius: 50%; box-shadow: 0 0 0 4px #ceefdf; }
.site-header { position: relative; z-index: 3; border-bottom: 1px solid var(--line); background: #fff; }
.nav { min-height: 72px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 11px; width: fit-content; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; flex: none; width: 39px; height: 39px; border-radius: 11px; background: linear-gradient(145deg, #6650e8, #542ecb); color: #fff; font-size: 22px; font-weight: 850; box-shadow: 0 3px 8px #5236d226; }
.brand strong { display: block; color: var(--purple); font-size: 18px; font-weight: 850; letter-spacing: -.03em; line-height: 1.18; }
.brand small { display: block; color: var(--muted); font-size: 10px; margin-top: 3px; }
.nav-links { display: flex; align-items: center; justify-content: center; gap: 9px; }
.nav-link { display: flex; align-items: center; justify-content: center; gap: 8px; min-height: 42px; padding: 0 12px; border-radius: 9px; color: #39465b; font-size: 14px; font-weight: 650; white-space: nowrap; }
.nav-link:hover, .nav-link[aria-current], .guide-menu[open] > summary { background: var(--purple-soft); color: var(--purple-dark); }
.guide-menu { position: relative; }
.guide-menu summary, .guide-step summary, .faq-list summary { cursor: pointer; list-style: none; }
.guide-menu summary::-webkit-details-marker, .guide-step summary::-webkit-details-marker, .faq-list summary::-webkit-details-marker { display: none; }
.chevron { width: 7px; height: 7px; border: solid currentColor; border-width: 0 1.5px 1.5px 0; transform: translateY(-2px) rotate(45deg); }
.guide-menu[open] .chevron { transform: translateY(2px) rotate(225deg); }
.menu-panel { position: absolute; top: calc(100% + 9px); left: 50%; transform: translateX(-50%); width: 290px; padding: 9px; background: #fff; border: 1px solid var(--line); border-radius: 13px; box-shadow: 0 16px 36px #17223d1a; }
.menu-title { padding: 4px 10px 7px; color: var(--muted); font-size: 11px; font-weight: 700; letter-spacing: .06em; }
.menu-panel a { display: flex; gap: 10px; align-items: center; padding: 9px 10px; border-radius: 9px; color: #39465b; font-size: 14px; }
.menu-panel a:hover, .menu-panel a:focus-visible, .menu-panel a[aria-current="page"] { background: var(--purple-soft); color: var(--purple-dark); }
.menu-icon { display: grid; place-items: center; flex: none; width: 34px; height: 34px; border-radius: 9px; background: #eef2f8; color: #40536d; font-size: 18px; font-weight: 750; }
.menu-panel small { display: block; margin-top: 3px; color: var(--muted); font-size: 12px; }
.header-action { justify-self: end; white-space: nowrap; color: #39465b; font-size: 13px; font-weight: 700; }
.header-action:hover { color: var(--purple); }

.price-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 64px 0 86px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 94%, #efedff 0%, #f7f7ff 36%, #fff 73%);
  border-bottom: 1px solid #edecfa;
}
.price-hero::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background-image: linear-gradient(90deg, #6754cb10 1px, transparent 1px), linear-gradient(#6754cb10 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(ellipse at center bottom, #000, transparent 70%);
}
.price-hero h1 { font-size: clamp(31px, 5vw, 56px); line-height: 1.15; font-weight: 850; letter-spacing: -.052em; }
.price-hero h1 em { color: var(--purple); font-style: normal; }
.price-hero p { margin: 16px auto 0; color: var(--muted); font-size: 16px; }
.hero-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 17px; color: var(--purple-dark); font-size: 14px; font-weight: 750; }
.hero-link:hover { text-decoration: underline; }
.price-section { position: relative; margin-top: -38px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 15px; }
.section-heading h2, .guide-strip h2 { font-size: 22px; letter-spacing: -.02em; }
.section-heading > span { white-space: nowrap; color: var(--muted); font-size: 12px; }
.plan-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.plan-card { display: flex; flex-direction: column; min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 6px 22px #242d4509; }
.plan-featured { border-color: #a398f5; background: linear-gradient(#f8f6ff, #fff 75%); box-shadow: 0 10px 26px #5d40dc14; }
.plan-icon { display: grid; place-items: center; width: 38px; height: 38px; margin-bottom: 16px; border-radius: 10px; font-weight: 800; font-size: 19px; }
.plus-icon { background: #e9f7ef; color: #24714f; }
.pro-icon { background: #e9e3ff; color: #5834c5; }
.high-icon { background: #eaeff9; color: #385187; }
.plan-card h3 { font-size: clamp(19px, 2.2vw, 23px); letter-spacing: -.035em; }
.plan-description { min-height: 45px; margin-top: 7px; color: var(--muted); font-size: 14px; }
.plan-price { display: flex; align-items: baseline; gap: 6px; margin: 10px 0 18px; line-height: 1; }
.price-value { font-size: 44px; font-weight: 850; letter-spacing: -.055em; font-variant-numeric: tabular-nums; }
.price-unit { color: var(--muted); font-size: 14px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; gap: 8px; padding: 10px 15px; border: 1px solid transparent; border-radius: 9px; font-size: 14px; font-weight: 750; line-height: 1.35; text-align: center; }
.button-primary { background: var(--purple); border-color: var(--purple); color: #fff; }
.button-primary:hover { background: var(--purple-dark); }
.button-secondary { background: #fff; border-color: #d8ddef; color: var(--purple-dark); }
.button-secondary:hover { background: var(--purple-soft); border-color: #ada1f5; }
.features { display: grid; gap: 12px; margin: 20px 0 0; padding: 19px 0 0; border-top: 1px solid var(--line); list-style: none; color: #39465b; font-size: 13px; }
.features li { display: flex; gap: 8px; align-items: baseline; }
.features li::before { flex: none; content: "✓"; color: #227756; font-weight: 850; }
.price-note { margin: 14px 0 0; color: var(--muted); font-size: 12px; }
.price-note a, .other-plans a { color: var(--purple-dark); font-weight: 750; }
.price-note a { margin-left: 8px; }
.price-note a:hover, .other-plans a:hover { text-decoration: underline; }
.other-plans { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: 24px; padding: 17px 20px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); font-size: 14px; }
.other-plans p { margin-top: 3px; color: var(--muted); font-size: 13px; }

.guide-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center; margin-block: 45px; padding: 26px; border: 1px solid #e1dcfc; border-radius: 16px; background: linear-gradient(120deg, #f6f3ff, #fff 85%); }
.guide-strip-copy p { margin: 6px 0 14px; color: var(--muted); font-size: 14px; }
.quick-steps { display: grid; gap: 9px; margin: 0; padding-left: 21px; color: #39465b; font-size: 14px; }
.quick-steps li { padding: 8px 10px; border-bottom: 1px solid #edeaf8; }
.quick-steps li::marker { color: var(--purple); font-weight: 800; }
.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 22px; }
.footer-brand { color: var(--purple); font-weight: 850; }
.footer-inner p { margin-top: 4px; color: var(--muted); font-size: 12px; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 15px; color: var(--muted); font-size: 13px; }
.footer-inner nav a:hover { color: var(--purple); }

.guide-intro { background: linear-gradient(120deg, #faf9ff, #fff 67%); border-bottom: 1px solid var(--line); padding-block: 39px 32px; }
.guide-intro h1 { margin-top: 8px; font-size: clamp(31px, 4.5vw, 48px); font-weight: 850; line-height: 1.14; letter-spacing: -.045em; }
.guide-intro p { margin-top: 12px; color: var(--muted); }
.guide-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.guide-content { padding-block: 30px 45px; background: var(--surface); }
.guide-layout, .support-layout { display: grid; grid-template-columns: minmax(0, 1fr) 266px; gap: 22px; align-items: start; }
.guide-main { min-width: 0; }
.guide-main h2 { margin-bottom: 14px; font-size: 22px; }
.guide-step { margin-bottom: 12px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.guide-step > summary { display: flex; align-items: center; gap: 13px; padding: 16px; font-weight: 750; }
.guide-step > summary::after, .faq-list summary::after { content: "+"; margin-left: auto; padding-left: 8px; color: var(--purple); font-size: 20px; line-height: 1; font-weight: 700; }
.guide-step[open] > summary::after, .faq-list details[open] > summary::after { content: "−"; }
.step-number { display: grid; place-items: center; flex: none; width: 37px; height: 37px; border-radius: 10px; background: var(--purple-soft); color: var(--purple-dark); font-size: 14px; font-weight: 800; }
.guide-step-body { padding: 16px; border-top: 1px solid var(--line); color: #39465b; font-size: 14px; }
.guide-step-body h3 { margin-bottom: 6px; }
.guide-step-body .button { margin-top: 12px; }
.faq-list a { color: var(--purple-dark); font-weight: 700; text-decoration: underline; text-underline-offset: 2px; }
.guide-aside { padding: 17px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.guide-aside h2 { font-size: 16px; }
.guide-aside p { margin-top: 7px; font-size: 13px; color: var(--muted); }
.guide-aside .guide-links { display: grid; }
.faq-list { margin-top: 30px; scroll-margin-top: 15px; }
.faq-list details { border: 1px solid var(--line); border-radius: 10px; background: #fff; margin-bottom: 8px; }
.faq-list summary { display: flex; align-items: center; gap: 6px; padding: 14px; font-weight: 700; font-size: 14px; }
.faq-list details p { padding: 0 14px 14px; color: var(--muted); font-size: 14px; }

.help-category { scroll-margin-top: 18px; }
.help-category.faq-list { margin-top: 0; }
.help-category + .help-category { margin-top: 26px; }
.help-category h2, #channels-title, .compare-checklist h2 { margin-bottom: 12px; font-size: 21px; }
.compare-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 15px; }
.compare-card { display: flex; flex-direction: column; min-width: 0; padding: 19px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.compare-card:first-child { border-color: #b0a4f4; }
.compare-card h3 { font-size: 19px; line-height: 1.35; }
.compare-card dl { flex: 1; margin-block: 3px 16px; }
.compare-card dt { margin-top: 11px; padding-top: 11px; border-top: 1px solid var(--line); font-size: 13px; font-weight: 750; }
.compare-card dd { margin: 4px 0 0; color: var(--muted); font-size: 13px; line-height: 1.65; overflow-wrap: anywhere; }
.compare-checklist { margin-top: 21px; padding: 19px; border: 1px solid #e2dcf8; border-radius: 13px; background: #fff; }
.compare-checklist ul, .compare-checklist ol { margin: 0; padding-left: 21px; color: var(--muted); font-size: 14px; line-height: 1.65; }
.compare-checklist li + li { margin-top: 5px; }
.compare-checklist .button { margin-top: 14px; }

@media (max-width: 850px) {
  .container { width: min(1120px, calc(100% - 38px)); }
  .plan-card { padding: 18px; }
  .guide-layout, .support-layout { grid-template-columns: minmax(0, 1fr) 225px; gap: 14px; }
}
@media (max-width: 680px) {
  .container { width: calc(100% - 30px); }
  .announcement { gap: 7px; padding-inline: 12px; font-size: 11px; }
  .announcement a { margin-left: 0; }
  .nav { grid-template-columns: 1fr auto; min-height: auto; gap: 0 8px; }
  .brand { padding-block: 11px; }
  .brand-mark { width: 34px; height: 34px; font-size: 18px; border-radius: 9px; }
  .brand strong { font-size: 16px; }
  .header-action { font-size: 12px; }
  .nav-links { grid-column: 1 / -1; grid-row: 2; border-top: 1px solid #eef0f6; gap: 4px; padding-block: 4px; }
  .nav-link { min-height: 39px; font-size: 13px; padding-inline: 9px; }
  .menu-panel { left: auto; right: -32px; transform: none; width: 244px; }
  .price-hero { padding: 38px 0 59px; }
  .price-hero h1 { max-width: 420px; margin-inline: auto; }
  .price-hero p { margin-top: 12px; font-size: 14px; }
  .hero-link { font-size: 13px; margin-top: 12px; }
  .price-section { margin-top: -30px; }
  .section-heading h2, .guide-strip h2 { font-size: 19px; }
  .plan-grid, .guide-strip, .guide-layout, .support-layout, .compare-grid { grid-template-columns: minmax(0, 1fr); }
  .plan-grid { gap: 12px; }
  .plan-description { min-height: 0; }
  .plan-card { padding: 19px; }
  .plan-icon { margin-bottom: 10px; }
  .plan-price { margin: 14px 0; }
  .price-value { font-size: 39px; }
  .features { margin-top: 15px; padding-top: 14px; gap: 9px; }
  .other-plans { align-items: flex-start; flex-direction: column; gap: 8px; }
  .guide-strip { gap: 13px; margin-block: 27px; padding: 19px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .guide-intro { padding-block: 29px 24px; }
  .guide-content { padding-block: 21px 30px; }
}