:root {
  --ink: #0b1020;
  --ink-soft: #202a44;
  --paper: #f7f5ef;
  --white: #fff;
  --line: #dcded8;
  --muted: #60697b;
  --blue: #4c6ef5;
  --blue-dark: #3654d4;
  --lime: #c9f27d;
  --orange: #ff835d;
  --radius: 24px;
  --shadow: 0 30px 80px rgba(11, 16, 32, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.skip-link { position: absolute; left: 16px; top: -80px; z-index: 20; background: var(--white); padding: 12px 16px; border-radius: 10px; }
.skip-link:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(1240px, calc(100% - 40px));
  margin: 18px auto 0;
  padding: 12px 14px 12px 18px;
  border: 1px solid rgba(11, 16, 32, .1);
  border-radius: 18px;
  background: rgba(247, 245, 239, .88);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; width: max-content; font-weight: 800; letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: var(--white); background: var(--ink); border-radius: 10px; font-size: 12px; letter-spacing: .03em; }
.nav-links { display: flex; gap: 30px; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--ink); }
.site-header > .button { justify-self: end; }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; border: 0; border-radius: 12px; padding: 15px 21px; font-weight: 700; cursor: pointer; transition: transform .2s, background .2s, box-shadow .2s; }
.button:hover { transform: translateY(-2px); }
.button:focus-visible, input:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid rgba(76, 110, 245, .3); outline-offset: 3px; }
.button-small { padding: 11px 17px; font-size: 14px; }
.button-ghost { color: var(--white); background: var(--ink); }
.button-primary { color: var(--white); background: var(--blue); box-shadow: 0 12px 28px rgba(76, 110, 245, .25); }
.button-primary:hover { background: var(--blue-dark); }
.button-light { color: var(--ink); background: var(--lime); }
.button-wide { width: 100%; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(520px, 1.1fr);
  align-items: center;
  gap: clamp(50px, 7vw, 110px);
  width: min(1200px, calc(100% - 48px));
  min-height: 740px;
  margin: 0 auto;
  padding: 90px 0 80px;
}
.eyebrow, .section-index { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 10px; }
.eyebrow span { width: 8px; height: 8px; background: var(--orange); border-radius: 50%; box-shadow: 0 0 0 6px rgba(255, 131, 93, .14); }
.hero h1 { margin: 28px 0 26px; max-width: 650px; font-size: clamp(54px, 6vw, 86px); line-height: .98; letter-spacing: -.065em; }
.hero h1 em { color: var(--blue); font-family: ui-serif, "Songti SC", serif; font-weight: 500; font-style: normal; }
.hero-lead { max-width: 600px; margin: 0 0 30px; color: var(--muted); font-size: 17px; line-height: 1.9; }
.signup-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; width: min(580px, 100%); }
.signup-form input { min-width: 0; border: 1px solid var(--line); border-radius: 12px; padding: 15px 17px; color: var(--ink); background: var(--white); }
.signup-form input::placeholder { color: #9ba1ad; }
.form-note { grid-column: 1 / -1; margin: 2px 0 0; color: #7a8291; font-size: 12px; }
.message { max-width: 580px; margin: 0 0 18px; padding: 13px 15px; border-radius: 12px; font-size: 14px; line-height: 1.55; }
.message-success { color: #17613d; background: #e1f5e9; border: 1px solid #b7dfc7; }
.message-notice { color: #77510b; background: #fff2c8; border: 1px solid #efd98a; }
.message-error { color: #9e352b; background: #ffe3df; border: 1px solid #f0b9b2; }

.hero-visual { position: relative; min-height: 610px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; inset: 7% 0 0 7%; border-radius: 48% 52% 40% 60%; background: var(--lime); transform: rotate(-7deg); }
.orbit { position: absolute; border: 1px solid rgba(11, 16, 32, .16); border-radius: 50%; }
.orbit-one { width: 540px; height: 540px; }
.orbit-two { width: 650px; height: 360px; transform: rotate(25deg); }
.mail-card { position: relative; width: min(520px, 92%); padding: 0 30px 28px; overflow: hidden; border: 1px solid rgba(11, 16, 32, .08); border-radius: 22px; background: var(--white); box-shadow: var(--shadow); transform: rotate(2.5deg); }
.mail-toolbar { display: flex; align-items: center; gap: 7px; margin: 0 -30px 24px; padding: 12px 18px; border-bottom: 1px solid #eceeea; background: #fafbf9; }
.mail-dot { width: 7px; height: 7px; border-radius: 50%; background: #d4d8d1; }
.mail-label { margin-left: auto; color: #9ba1ad; font-size: 10px; }
.mail-heading { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 20px; border-bottom: 2px solid var(--ink); }
.mail-heading small { color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.mail-heading h2 { margin: 6px 0 0; font-size: 22px; letter-spacing: -.03em; }
.mail-heading time { color: #9ba1ad; font-size: 11px; }
.digest-tag { margin: 19px 0 9px; color: var(--blue); font-size: 10px; font-weight: 800; letter-spacing: .1em; }
.digest-tag.domestic { color: #cf623f; }
.news-row { display: grid; grid-template-columns: 30px 1fr; gap: 12px; padding: 12px 0; border-bottom: 1px solid #eceeea; }
.news-row > span { display: grid; place-items: center; width: 25px; height: 25px; border-radius: 50%; color: var(--blue); background: #edf0ff; font-size: 10px; font-weight: 800; }
.news-row h3 { margin: 1px 0 5px; font-size: 14px; }
.news-row p { margin: 0 0 6px; color: #687083; font-size: 11px; line-height: 1.6; }
.news-row small { color: #9aa0ad; font-size: 9px; }
.news-row.compact { border: 0; }
.signal-card { position: absolute; right: -12px; bottom: 60px; display: flex; flex-direction: column; padding: 17px 21px; color: var(--white); background: var(--ink); border-radius: 14px; box-shadow: 0 18px 40px rgba(11, 16, 32, .25); transform: rotate(-4deg); }
.signal-card strong { font-size: 19px; }
.signal-card span { margin-top: 3px; color: #aeb6c8; font-size: 10px; }

.source-strip { display: grid; grid-template-columns: auto 1fr; gap: 35px; align-items: center; width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 26px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.source-strip p { margin: 0; color: #8a909b; font-size: 12px; }
.source-strip div { display: flex; justify-content: space-between; gap: 22px; color: #777e8c; font-size: 13px; font-weight: 700; }

.section { width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 130px 0; }
.section-heading { max-width: 650px; }
.section-heading h2, .pricing-copy h2 { margin: 20px 0 18px; font-size: clamp(40px, 5vw, 64px); line-height: 1.07; letter-spacing: -.05em; }
.section-heading p, .pricing-copy > p { color: var(--muted); line-height: 1.8; }
.value-grid { display: grid; grid-template-columns: 1.3fr .85fr; gap: 20px; margin-top: 56px; }
.value-card { position: relative; min-height: 280px; padding: 34px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.value-card.featured { grid-row: span 2; min-height: 580px; background: #e8edff; }
.value-card.dark { color: var(--white); background: var(--ink); border-color: var(--ink); }
.card-number { color: var(--blue); font-size: 12px; font-weight: 800; }
.value-card.dark .card-number { color: var(--lime); }
.value-card h3 { max-width: 420px; margin: 50px 0 16px; font-size: clamp(24px, 3vw, 35px); line-height: 1.15; letter-spacing: -.035em; }
.value-card p { max-width: 490px; margin: 0; color: var(--muted); line-height: 1.8; }
.value-card.dark p { color: #abb4c7; }
.filter-visual { position: absolute; left: 34px; right: 34px; bottom: 38px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: end; gap: 14px; height: 140px; }
.filter-visual i { display: block; border-radius: 12px 12px 4px 4px; background: rgba(76, 110, 245, .18); }
.filter-visual i:nth-child(1) { height: 55%; }.filter-visual i:nth-child(2) { height: 78%; }.filter-visual i:nth-child(3) { height: 38%; }.filter-visual i:nth-child(4) { height: 92%; background: var(--blue); }
.filter-visual b { position: absolute; right: 17px; top: 12px; color: var(--white); font-size: 12px; writing-mode: vertical-rl; }

.method-section { border-top: 1px solid var(--line); }
.section-heading.horizontal { display: flex; align-items: end; justify-content: space-between; max-width: none; gap: 60px; }
.section-heading.horizontal > div { max-width: 760px; }
.section-heading.horizontal > p { max-width: 320px; margin-bottom: 25px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin: 55px 0 0; padding: 0; list-style: none; border-top: 2px solid var(--ink); }
.steps li { display: grid; grid-template-columns: auto 1fr; gap: 28px; padding: 32px 30px 10px 0; }
.steps li + li { padding-left: 30px; border-left: 1px solid var(--line); }
.steps li > span { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 50%; color: var(--blue); font-size: 11px; font-weight: 800; }
.steps h3 { margin: 6px 0 10px; font-size: 23px; }
.steps p { margin: 0; color: var(--muted); line-height: 1.7; }

.pricing-section { display: grid; grid-template-columns: 1fr 480px; align-items: center; gap: 100px; }
.pricing-copy { max-width: 620px; }
.price-card { position: relative; padding: 44px; color: var(--white); background: var(--ink); border-radius: 30px; box-shadow: var(--shadow); }
.price-badge { position: absolute; right: 26px; top: 26px; padding: 7px 11px; color: var(--ink); background: var(--lime); border-radius: 999px; font-size: 11px; font-weight: 800; }
.price-name { margin: 0 0 25px; color: #aab3c5; font-size: 13px; }
.price { display: flex; align-items: baseline; gap: 6px; }
.price span { color: var(--lime); font-size: 22px; font-weight: 800; }
.price strong { font-size: 78px; line-height: 1; letter-spacing: -.06em; }
.price small { color: #aab3c5; }
.trial-line { margin: 12px 0 30px; color: var(--lime); font-weight: 700; }
.price-card ul { display: grid; gap: 14px; margin: 0 0 32px; padding: 25px 0 0; border-top: 1px solid #303a52; list-style: none; }
.price-card li { position: relative; padding-left: 24px; color: #d0d5df; font-size: 14px; }
.price-card li::before { content: "✓"; position: absolute; left: 0; color: var(--lime); font-weight: 900; }
.payment-note { margin: 14px 0 0; color: #939db1; font-size: 11px; line-height: 1.6; text-align: center; }
.payment-note a { color: var(--lime); text-decoration: underline; }

.faq-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; border-top: 1px solid var(--line); }
.faq-list { border-top: 2px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; justify-content: space-between; gap: 20px; padding: 25px 2px; cursor: pointer; font-weight: 700; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--blue); font-size: 20px; transition: transform .2s; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { margin: -5px 40px 24px 0; color: var(--muted); line-height: 1.8; }

.final-cta { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 80px; width: min(1240px, calc(100% - 32px)); margin: 20px auto; padding: 70px; color: var(--white); background: var(--blue); border-radius: 34px; }
.final-cta > div > span { color: var(--lime); font-size: 12px; font-weight: 800; letter-spacing: .13em; }
.final-cta h2 { margin: 18px 0 0; font-size: clamp(45px, 5vw, 68px); line-height: 1.02; letter-spacing: -.055em; }
.signup-form.inverse { width: 100%; }
.signup-form.inverse input { border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.12); color: var(--white); }
.signup-form.inverse input::placeholder { color: rgba(255,255,255,.68); }
.signup-form.inverse .form-note { color: rgba(255,255,255,.68); }

.site-footer { display: grid; grid-template-columns: 1fr auto auto; gap: 35px; align-items: center; width: min(1200px, calc(100% - 48px)); margin: 0 auto; padding: 48px 0; color: #7a8291; font-size: 12px; }
.site-footer p { margin: 0; }
.footer-brand { color: var(--ink); font-size: 15px; }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  .nav-links { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 80px; }
  .hero-copy { max-width: 720px; }
  .hero-visual { min-height: 630px; }
  .source-strip { grid-template-columns: 1fr; gap: 15px; }
  .source-strip div { flex-wrap: wrap; justify-content: flex-start; }
  .pricing-section, .faq-section { grid-template-columns: 1fr; gap: 55px; }
  .price-card { max-width: 560px; }
  .final-cta { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .site-header { width: calc(100% - 24px); margin-top: 10px; }
  .site-header .button { padding: 10px 13px; }
  .hero, .section, .source-strip { width: calc(100% - 32px); }
  .hero { min-height: auto; padding: 70px 0 45px; }
  .hero h1 { font-size: 52px; }
  .hero-lead { font-size: 15px; }
  .signup-form { grid-template-columns: 1fr; }
  .signup-form .form-note { grid-column: auto; }
  .hero-visual { min-height: 500px; margin: 0 -10px; }
  .mail-card { width: 95%; padding: 0 20px 22px; }
  .mail-toolbar { margin: 0 -20px 20px; }
  .signal-card { right: 0; bottom: 18px; }
  .orbit-one { width: 390px; height: 390px; }
  .orbit-two { width: 420px; height: 270px; }
  .section { padding: 90px 0; }
  .section-heading h2, .pricing-copy h2 { font-size: 42px; }
  .value-grid { grid-template-columns: 1fr; }
  .value-card.featured { grid-row: auto; min-height: 500px; }
  .section-heading.horizontal { display: block; }
  .steps { grid-template-columns: 1fr; }
  .steps li + li { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .pricing-section { gap: 40px; }
  .price-card { padding: 34px 25px; }
  .price strong { font-size: 64px; }
  .faq-section { gap: 40px; }
  .final-cta { width: calc(100% - 20px); padding: 48px 24px; border-radius: 25px; }
  .final-cta h2 { font-size: 44px; }
  .site-footer { grid-template-columns: 1fr; width: calc(100% - 40px); gap: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}