:root {
  --ink: #24272d;
  --muted: #626873;
  --paper: #fffaf5;
  --surface: #ffffff;
  --line: #eadfd6;
  --coral: #d94f45;
  --coral-dark: #b43731;
  --teal: #2c716d;
  --charcoal: #23272b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
.container, .header-inner, .hero-inner { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.narrow { max-width: 860px; }

.site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,250,245,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.header-inner { height: 72px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; }
.brand img, .footer-brand img { border-radius: 8px; }
.nav { display: flex; align-items: center; gap: 26px; font-size: 15px; font-weight: 650; }
.nav a { color: #4f555e; }
.nav a:hover, .nav a.active { color: var(--coral-dark); }
.nav .download-link { color: #fff; background: var(--coral); padding: 9px 18px; border-radius: 6px; }
.menu-toggle { display: none; border: 0; background: none; font-size: 26px; color: var(--ink); }

.hero { min-height: 650px; display: flex; align-items: center; overflow: hidden; background: linear-gradient(90deg, #fffaf5 0 64%, #f3e9df 64%); }
.hero-inner { display: grid; grid-template-columns: .95fr 1.05fr; align-items: center; gap: 60px; padding: 54px 0 62px; }
.eyebrow { color: var(--teal); font-size: 13px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 20px; font-size: clamp(42px, 5vw, 66px); line-height: 1.12; letter-spacing: 0; }
.hero-copy > p { max-width: 580px; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; gap: 12px; margin: 28px 0 24px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 22px; border-radius: 6px; font-weight: 750; border: 1px solid transparent; }
.button.primary { color: #fff; background: var(--coral); }
.button.primary:hover { background: var(--coral-dark); }
.button.secondary { color: var(--teal); border-color: #b9d0cd; background: #fff; }
.hero-tags { display: flex; gap: 10px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.hero-tags li { padding: 5px 11px; color: #4f5a5b; background: #edf5f3; border-radius: 4px; font-size: 13px; }
.hero-media { position: relative; min-height: 500px; display: flex; align-items: center; justify-content: center; }
.screen { max-width: 400px; border: 8px solid #fff; border-radius: 20px; box-shadow: 0 18px 45px rgba(60,44,34,.17); }
.screen-main { width: 299px; transform: translateX(28px) rotate(1deg); }
.screen-side { position: absolute; width: 215px; left: 0; bottom: 8px; transform: rotate(-4deg); }

.section-pad { padding: 88px 0; }
.section-heading { display: flex; align-items: baseline; gap: 14px; margin-bottom: 34px; }
.section-heading span { color: var(--coral); font-size: 13px; font-weight: 850; }
.section-heading h2 { margin: 0; font-size: 34px; line-height: 1.2; }
.section-heading.light h2, .section-heading.light span { color: #fff; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-grid article { padding: 25px; background: #fff; border: 1px solid var(--line); border-radius: 7px; }
.feature-grid b { color: var(--coral-dark); font-size: 13px; }
.feature-grid h3 { margin: 9px 0; font-size: 20px; }
.feature-grid p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
.gallery-section { background: var(--charcoal); color: #f8f8f6; }
.gallery-layout { display: grid; grid-template-columns: 300px 1fr; gap: 54px; align-items: center; }
.gallery-copy p { color: #c7cbce; }
.text-link { color: #ffb2a9; font-weight: 700; }
.gallery-track { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-items: end; }
.gallery-track figure { margin: 0; text-align: center; }
.gallery-track img { width: 100%; max-width: 240px; max-height: 360px; object-fit: contain; margin: 0 auto; border-radius: 12px; background: #fff; box-shadow: 0 16px 34px rgba(0,0,0,.25); }
.gallery-track figcaption { margin-top: 12px; color: #c7cbce; font-size: 13px; }
.path-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.path-grid a { padding: 30px; background: #fff; border: 1px solid var(--line); border-radius: 7px; transition: transform .2s ease, border-color .2s ease; }
.path-grid a:hover { transform: translateY(-3px); border-color: #d8bcb0; }
.path-grid span { color: var(--teal); font-weight: 800; font-size: 13px; }
.path-grid h3 { margin: 8px 0; font-size: 24px; }
.path-grid p { color: var(--muted); }
.path-grid b { color: var(--coral-dark); }
.faq-preview { background: #f5ece4; }
details { background: #fff; border: 1px solid var(--line); border-radius: 6px; margin-bottom: 12px; }
summary { cursor: pointer; padding: 17px 20px; font-weight: 750; }
details p { padding: 0 20px 18px; color: var(--muted); margin: 0; }
.more-link { display: inline-block; margin-top: 14px; color: var(--coral-dark); font-weight: 750; }
.download-band { padding: 42px 0; background: var(--teal); color: #fff; }
.download-band .container { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.download-band h2 { margin-bottom: 3px; font-size: 28px; }
.download-band p { margin-bottom: 0; color: #d9ebe9; }
footer { padding: 45px 0; text-align: center; background: #1d2023; color: #c8cccf; }
.footer-brand { display: flex; justify-content: center; align-items: center; gap: 9px; color: #fff; margin-bottom: 14px; }
footer p { max-width: 760px; margin: 0 auto 10px; font-size: 13px; }
footer small { color: #8e9499; }

.inner-main { background: #fff; }
.inner-hero { padding: 78px 0 64px; background: #f5ece4; border-bottom: 1px solid var(--line); }
.inner-hero h1 { max-width: 820px; font-size: clamp(36px, 5vw, 56px); margin: 10px 0 16px; }
.inner-hero p { max-width: 760px; color: var(--muted); font-size: 17px; margin-bottom: 0; }
.article-layout { display: grid; grid-template-columns: 220px 1fr; gap: 70px; padding-top: 70px; padding-bottom: 90px; }
.toc { position: sticky; top: 100px; align-self: start; display: grid; gap: 12px; padding: 20px; background: var(--paper); border: 1px solid var(--line); border-radius: 6px; }
.toc a { color: var(--muted); font-size: 14px; }
.toc a:hover { color: var(--coral-dark); }
.article-content { max-width: 760px; }
.article-content section { scroll-margin-top: 100px; padding-bottom: 42px; margin-bottom: 42px; border-bottom: 1px solid var(--line); }
.article-content h2 { font-size: 30px; margin: 7px 0 16px; }
.article-content p { color: #4f555e; }
.article-content a { color: var(--coral-dark); text-decoration: underline; }
.step { color: var(--teal); font-size: 12px; font-weight: 850; }
.note { padding: 19px 22px; background: #edf5f3; border-left: 4px solid var(--teal); }
.note p { margin-bottom: 0; }
.faq-page { padding-top: 58px; padding-bottom: 90px; }
.faq-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.faq-filter button { padding: 8px 16px; border: 1px solid var(--line); background: #fff; border-radius: 5px; color: var(--muted); cursor: pointer; }
.faq-filter button.active { color: #fff; background: var(--teal); border-color: var(--teal); }
.faq-list { max-width: 900px; }
.faq-list details[hidden] { display: none; }
.help-card { margin-top: 46px; padding: 30px; background: var(--paper); border: 1px solid var(--line); border-radius: 7px; }
.help-card h2 { margin-bottom: 8px; }

@media (max-width: 900px) {
  .menu-toggle { display: block; }
  .nav { display: none; position: absolute; inset: 72px 20px auto; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 7px; box-shadow: 0 12px 25px rgba(40,30,20,.12); flex-direction: column; align-items: stretch; gap: 8px; }
  .nav.open { display: flex; }
  .nav a { padding: 9px 10px; }
  .hero { min-height: auto; background: #fffaf5; }
  .hero-inner { grid-template-columns: 1fr; gap: 28px; padding: 42px 0 52px; }
  .hero-media { min-height: 420px; order: 2; }
  .screen-main { width: 240px; }
  .screen-side { width: 170px; left: 12%; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .gallery-layout { grid-template-columns: 1fr; }
  .gallery-track img { max-height: 310px; }
  .article-layout { grid-template-columns: 1fr; gap: 35px; }
  .toc { position: static; grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .container, .header-inner, .hero-inner { width: min(100% - 28px, 1160px); }
  .header-inner { height: 64px; }
  .nav { top: 64px; inset-inline: 14px; }
  h1 { font-size: 40px; }
  .hero-inner { padding-top: 26px; padding-bottom: 38px; }
  .hero-copy > p { font-size: 15px; }
  .hero-actions { flex-wrap: wrap; }
  .hero-media { min-height: 292px; }
  .screen-main { width: 178px; transform: translateX(32px); }
  .screen-side { width: 124px; left: 3%; bottom: 0; }
  .section-pad { padding: 60px 0; }
  .section-heading h2 { font-size: 29px; }
  .feature-grid, .path-grid { grid-template-columns: 1fr; }
  .gallery-track { overflow-x: auto; grid-template-columns: repeat(3, 200px); padding-bottom: 14px; }
  .gallery-track img { height: 300px; }
  .download-band .container { align-items: flex-start; flex-direction: column; }
  .inner-hero { padding: 50px 0 44px; }
  .inner-hero h1 { font-size: 38px; }
  .article-layout { padding-top: 42px; }
  .toc { grid-template-columns: 1fr 1fr; }
}