:root {
  color-scheme: light;
  --paper: #f7f6f2;
  --ink: #20263d;
  --blue: #304bbb;
  --muted: #666b79;
  --line: #deded6;
  --gold: #f0d979;
  --radius: 28px;
  --header-height: 88px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
body { margin: 0; font-size: 16px; line-height: 1.7; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 24px); }
h1, h2, h3, p, figure { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; height: auto; }
[hidden] { display: none !important; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid #6985ef; outline-offset: 6px; }
.shell { width: min(1184px, calc(100% - 96px)); margin-inline: auto; }
.section-space { padding-block: 108px; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 100; background: var(--ink); color: white; padding: 12px 20px; border-radius: 8px; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; height: var(--header-height); z-index: 20; background: rgba(247,246,242,.96); border-bottom: 1px solid rgba(32,38,61,.07); backdrop-filter: blur(16px); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 28px; font-weight: 800; letter-spacing: -1.5px; line-height: 1; }
.brand img { border-radius: 12px; width: 42px; height: 42px; }
.brand-dot { color: var(--blue); }
.nav-links { display: flex; gap: 30px; align-items: center; font-size: 13px; font-weight: 550; }
.nav-links a:not(.nav-button):hover, .text-link:hover { color: var(--blue); }
.nav-button { padding: 10px 19px; border: 1px solid #c6c8cd; border-radius: 100px; display: flex; gap: 18px; align-items: center; transition: background .2s; }
.nav-button:hover { background: #e9ebf0; }
.nav-toggle { display: none; border: 0; background: none; width: 44px; height: 44px; padding: 11px; }
.nav-toggle span { display: block; height: 2px; margin: 6px 0; background: var(--ink); }
.hero { display: grid; grid-template-columns: 1.13fr 1fr; align-items: center; column-gap: 32px; padding-top: 56px; }
.hero-copy { padding-bottom: 30px; }
.hero h1 { font-size: clamp(42px, 4.5vw, 66px); line-height: 1.25; font-weight: 800; letter-spacing: -2.4px; }
.hero h1 > span { color: var(--blue); }
.hero-description { font-size: 16px; line-height: 2; color: var(--muted); margin-top: 27px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 27px; margin-top: 32px; }
.button { display: inline-flex; gap: 28px; align-items: center; justify-content: space-between; min-height: 54px; padding: 13px 25px; font-size: 14px; font-weight: 650; border: 1px solid transparent; border-radius: 100px; transition: transform .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button-dark { color: white; background: var(--ink); }
.button-dark:hover { background: var(--blue); }
.button-outline { border-color: #c8cbd3; }
.button-outline:hover { background: #f0f1f5; }
.button-gold { background: var(--gold); color: var(--ink); }
.button-gold:hover { background: #fae595; }
.text-link { font-size: 13px; font-weight: 600; display: inline-flex; gap: 15px; }
.hero-signoff { display: flex; align-items: center; gap: 12px; margin-top: 44px; font-size: 12px; color: var(--muted); }
.mini-dots { display: flex; gap: 5px; align-items: center; }
.mini-dots i { width: 7px; height: 7px; border-radius: 50%; background: #dadce2; }
.mini-dots i:nth-child(2) { background: #aeb8dc; }
.mini-dots i:nth-child(3) { background: #7386ce; }
.mini-dots i:nth-child(4) { background: #cfb94d; }
.hero-visual { justify-self: center; width: min(440px, 100%); }
.product-preview { background: #efefef; border: 1px solid #e0e1e4; border-radius: var(--radius); overflow: hidden; }
.mockup-link { display: block; padding: 12px 12px 0; cursor: zoom-in; }
.mockup-link img { width: auto; max-width: 100%; max-height: 640px; margin-inline: auto; object-fit: contain; }
.hero-visual .mockup-link img { max-height: 580px; }
.product-preview figcaption { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin: 0 24px; padding: 16px 0 19px; border-top: 1px solid #d9dbe0; color: #606879; font-size: 10px; }
.product-preview figcaption > span:last-child { color: #4056a1; }
.hero-footnote { grid-column: 1 / -1; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 12px; color: var(--muted); padding: 26px 0; margin-top: 22px; border-top: 1px solid var(--line); }
.hero-footnote > span::before { content: '+'; color: var(--blue); margin-right: 12px; }
.hero-footnote a:hover { color: var(--blue); }
.feature-section { background: #fff; margin-top: 30px; }
.eyebrow { font-size: 10px; font-weight: 700; letter-spacing: 2px; color: var(--blue); margin-bottom: 20px; }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; margin-bottom: 55px; }
.section-heading h2, .theme-copy h2, .faq-heading h2 { font-size: clamp(30px, 3.3vw, 44px); font-weight: 650; letter-spacing: -1px; line-height: 1.35; }
.section-heading > p, .theme-copy > p:not(.eyebrow):not(.small-note), .faq-heading > p:not(.eyebrow) { font-size: 14px; color: var(--muted); line-height: 1.9; }
.learning-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 88px; align-items: center; }
.learning-notes { display: grid; gap: 32px; }
.learning-notes article { display: flex; gap: 22px; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
.learning-notes article:last-child { border: 0; padding-bottom: 0; }
.step-number { font-size: 11px; color: var(--blue); padding-top: 6px; }
.learning-notes h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
.learning-notes p { font-size: 14px; color: var(--muted); max-width: 360px; }
.feature-tag { display: inline-block; margin-top: 17px; font-size: 10px; color: #62718e; }
.theme-section { display: grid; grid-template-columns: 1fr 1.1fr; gap: 80px; align-items: center; }
.theme-copy > p:not(.eyebrow) { margin-top: 22px; }
.theme-options { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.theme-options button { display: flex; align-items: center; gap: 9px; border: 1px solid #c6cad4; background: transparent; padding: 10px 18px; border-radius: 30px; font-size: 13px; color: var(--muted); }
.theme-options button[aria-pressed="true"] { border-color: var(--blue); background: white; color: var(--blue); }
.theme-options i { width: 12px; height: 12px; flex-shrink: 0; border-radius: 50%; border: 1px solid #939aaf; }
.swatch-light { background: #faf9f6; }
.swatch-dark { background: #24242c; }
.small-note { font-size: 11px; color: var(--muted); }
.pricing-section { background: #edeee9; }
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.plan { border-radius: var(--radius); padding: 36px 40px; }
.plan-free { background: #fbfcfa; border: 1px solid #dadfd9; }
.plan-pro { background: #20263d; color: #fafaf7; }
.plan-top { display: flex; align-items: center; justify-content: space-between; }
.plan-label { font-size: 12px; font-weight: 700; letter-spacing: 1.7px; }
.plan-symbol { font-size: 32px; line-height: 1; color: #818caa; }
.plan-pro .plan-symbol, .plan-pro .plan-label { color: var(--gold); }
.plan h3 { font-size: 23px; font-weight: 600; margin-top: 24px; }
.plan-intro { color: var(--muted); font-size: 12px; margin-top: 7px; }
.plan-pro .plan-intro { color: #c2c7d7; }
.plan ul { padding: 25px 0; margin: 20px 0 23px; list-style: none; border-top: 1px solid #a8adba40; border-bottom: 1px solid #a8adba40; }
.plan li { display: flex; flex-wrap: wrap; align-items: baseline; font-size: 13px; padding: 7px 0; }
.plan li::before { content: '✓'; width: 25px; font-weight: 600; color: #8490a5; }
.plan li strong { font-weight: 650; }
.plan-pro li::before { color: var(--gold); }
.plan .button { width: 100%; }
.plan-note { font-size: 11px; color: #666c72; max-width: 820px; line-height: 1.9; margin-top: 24px; }
.plan-note a { text-decoration: underline; text-underline-offset: 3px; }
.faq-section { display: grid; grid-template-columns: .8fr 1.3fr; gap: 80px; }
.faq-heading > p:last-child { margin-top: 24px; }
.faq-heading a { color: var(--blue); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { list-style: none; padding: 24px 32px 24px 0; cursor: pointer; position: relative; font-size: 15px; font-weight: 550; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; position: absolute; right: 3px; font-size: 23px; line-height: 1; font-weight: 400; top: 24px; color: var(--blue); }
.faq-list details[open] summary::after { content: '−'; }
.faq-list details p { font-size: 13px; color: var(--muted); padding: 0 20px 24px 0; line-height: 1.9; }
.faq-list details a { text-decoration: underline; text-underline-offset: 3px; color: var(--blue); }
.contact-panel { background: #3047a0; color: white; padding: 58px 65px; border-radius: 32px; display: flex; align-items: center; justify-content: space-between; gap: 45px; overflow: hidden; }
.contact-copy { flex-shrink: 0; }
.contact-copy .eyebrow { color: #e4d386; }
.contact-copy h2 { font-size: clamp(30px, 3.4vw, 45px); font-weight: 600; line-height: 1.4; letter-spacing: -1px; }
.contact-copy > p:not(.eyebrow) { color: #d6dcf5; font-size: 13px; line-height: 1.9; margin-top: 18px; }
.contact-copy .button { margin-top: 28px; }
.social-card { flex: 0 1 340px; min-width: 0; padding: 30px; background: #f9f5f0; border-radius: 24px; color: var(--ink); transform: rotate(3deg); }
.social-platform { display: inline-block; font-size: 12px; font-weight: 750; color: #c92643; padding: 4px 11px; border: 1px solid #eab6bc; border-radius: 30px; }
.social-card h3 { margin-top: 23px; font-size: 26px; line-height: 1.5; font-weight: 650; }
.social-card > p:not(.copy-status) { margin-top: 14px; font-size: 12px; color: var(--muted); }
.social-account { margin-top: 27px; padding-top: 20px; border-top: 1px solid #dddcd6; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.social-account > span { font-size: 10px; }
.social-account strong { font-size: 20px; font-weight: 650; font-variant-numeric: tabular-nums; letter-spacing: .5px; user-select: all; }
.social-account button { padding: 5px 10px; border: 1px solid #bfc5d1; border-radius: 8px; background: transparent; color: #4056a1; font-size: 11px; }
.copy-status { font-size: 10px; color: #53627c; margin-top: 10px; min-height: 17px; }
.site-footer { padding-top: 82px; }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 25px; padding-bottom: 50px; }
.footer-message { font-size: 12px; margin-top: 18px; color: var(--muted); }
.footer-column { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; }
.footer-column h2 { font-size: 11px; font-weight: 600; margin-bottom: 8px; }
.footer-column a { font-size: 12px; color: var(--muted); }
.footer-column a:hover { color: var(--blue); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 15px; border-top: 1px solid var(--line); padding: 24px 0 34px; color: var(--muted); font-size: 10px; }
@media (min-width: 1500px) { .hero { padding-top: 80px; } }
@media (max-width: 1050px) {
  .shell { width: calc(100% - 64px); }
  .nav-links { gap: 20px; }
  .hero { column-gap: 16px; }
  .hero h1 { font-size: 47px; }
  .hero-visual .mockup-link img { max-height: 540px; }
  .learning-layout { gap: 44px; }
  .theme-section { gap: 38px; }
  .plan { padding: 30px; }
  .faq-section { gap: 50px; }
  .contact-panel { padding: 50px; }
}
@media (max-width: 800px) {
  :root { --header-height: 72px; }
  .shell { width: calc(100% - 48px); }
  .section-space { padding-block: 70px; }
  .brand { font-size: 25px; }
  .brand img { width: 36px; height: 36px; border-radius: 9px; }
  .nav-toggle { display: block; }
  .nav-links { position: absolute; top: 72px; right: 0; left: 0; padding: 24px; background: var(--paper); border-bottom: 1px solid var(--line); display: none; align-items: stretch; gap: 0; box-shadow: 0 18px 25px #20263d0a; }
  .nav-links.open { display: flex; flex-direction: column; }
  .nav-links a { padding: 14px 10px; }
  .nav-links .nav-button { margin-top: 10px; padding: 12px 18px; justify-content: space-between; }
  .hero { grid-template-columns: 1fr; padding-top: 50px; }
  .hero-copy { padding-bottom: 0; }
  .hero h1 { font-size: clamp(39px, 7vw, 58px); }
  .hero-description { font-size: 15px; margin-top: 20px; }
  .hero-actions { margin-top: 25px; }
  .hero-signoff { margin-top: 26px; }
  .hero-visual { width: min(420px, 100%); margin: 36px auto 0; }
  .hero-footnote { margin-top: 8px; font-size: 10px; justify-content: flex-start; column-gap: 22px; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 22px; margin-bottom: 35px; }
  .section-heading h2, .theme-copy h2, .faq-heading h2 { font-size: 35px; }
  .learning-layout { grid-template-columns: 1fr; gap: 40px; }
  .learning-notes h3 { font-size: 20px; }
  .learning-notes p { max-width: none; }
  .theme-section { grid-template-columns: 1fr; gap: 35px; }
  .theme-options { gap: 12px; }
  .theme-options button { padding: 10px 16px; font-size: 12px; }
  .plans { grid-template-columns: 1fr; gap: 18px; }
  .plan { padding: 28px; }
  .plan h3 { font-size: 22px; }
  .faq-section { grid-template-columns: 1fr; gap: 32px; }
  .faq-heading h2 br { display: none; }
  .faq-heading > p:last-child { margin-top: 15px; }
  .contact-panel { flex-direction: column; align-items: flex-start; padding: 35px; gap: 10px; }
  .contact-copy { flex-shrink: 1; }
  .social-card { flex: none; width: 100%; margin-top: 24px; transform: none; padding: 25px; }
  .contact-copy h2 { font-size: 34px; }
  .site-footer { padding-top: 55px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 35px 20px; }
}
@media (max-width: 380px) {
  .shell { width: calc(100% - 36px); }
  .hero h1 { font-size: 36px; letter-spacing: -2px; }
  .hero-actions { gap: 20px; }
  .hero-actions .button { padding: 12px 19px; gap: 17px; }
  .text-link { font-size: 12px; gap: 8px; }
  .product-preview figcaption { margin-inline: 16px; font-size: 9px; }
  .plan { padding: 24px; }
  .plan h3 { font-size: 19px; }
  .contact-panel { padding: 29px; }
  .contact-copy h2 { font-size: 29px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}