:root {
  --ink: #241b1b;
  --muted: #6f5a56;
  --cream: #fff7ef;
  --paper: #fffdf9;
  --coral: #ff7048;
  --orange: #ffb347;
  --rose: #ef5369;
  --line: #f1ded5;
  --shadow: 0 20px 60px rgba(92, 43, 27, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 253, 249, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 800; letter-spacing: .02em; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border-radius: 13px; }
.main-nav { display: flex; align-items: center; gap: 22px; margin-left: auto; color: var(--muted); font-size: 14px; }
.main-nav a { padding: 8px 0; border-bottom: 2px solid transparent; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--ink); border-color: var(--coral); }
.nav-cta, .button-primary {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0 20px; border-radius: 12px;
  background: var(--ink); color: #fff; font-weight: 700; font-size: 14px;
  box-shadow: 0 10px 22px rgba(36, 27, 27, .18);
  transition: transform .2s ease, background .2s ease;
}
.nav-cta:hover, .button-primary:hover { transform: translateY(-2px); background: var(--coral); }
.button-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0 20px; border-radius: 12px;
  border: 1px solid var(--line); background: #fff; font-weight: 700; font-size: 14px;
}

.hero { position: relative; overflow: hidden; padding: 82px 0 76px; background: var(--cream); }
.hero::after { content: ""; position: absolute; width: 420px; height: 420px; right: -130px; top: -150px; border-radius: 50%; background: #ffe0bb; opacity: .7; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 60px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--rose); font-size: 13px; font-weight: 800; letter-spacing: .12em; }
.eyebrow::before { content: ""; width: 28px; height: 3px; border-radius: 4px; background: var(--coral); }
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: 0; }
.hero h1 { margin-top: 18px; max-width: 520px; font-size: clamp(38px, 6vw, 70px); font-weight: 900; }
.hero h1 span { color: var(--coral); }
.hero-copy { margin: 22px 0 0; max-width: 600px; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-note { margin-top: 16px; color: #8b746b; font-size: 12px; }
.hero-art { min-height: 390px; display: grid; place-items: center; }
.phone-stack { position: relative; width: min(360px, 100%); height: 390px; }
.phone-card { position: absolute; overflow: hidden; border: 7px solid #201718; border-radius: 32px; background: #201718; box-shadow: var(--shadow); }
.phone-card img { width: 100%; height: 100%; object-fit: cover; }
.phone-card.back { width: 184px; height: 328px; left: 16px; top: 44px; transform: rotate(-9deg); opacity: .86; }
.phone-card.front { width: 206px; height: 366px; right: 10px; top: 9px; transform: rotate(6deg); }
.burst { position: absolute; left: 8px; bottom: 18px; display: grid; place-items: center; width: 92px; height: 92px; border-radius: 50%; color: #fff; background: var(--rose); font-size: 13px; font-weight: 800; transform: rotate(-12deg); box-shadow: 0 12px 24px rgba(239, 83, 105, .3); }

.section { padding: 82px 0; }
.section-tint { background: var(--cream); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 30px; }
.section-kicker { margin: 0 0 8px; color: var(--coral); font-size: 13px; font-weight: 800; letter-spacing: .1em; }
.section h2 { font-size: clamp(28px, 4vw, 42px); }
.section-head .head-note { max-width: 410px; color: var(--muted); font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature-card { min-height: 220px; padding: 24px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 8px 24px rgba(97, 49, 28, .05); }
.feature-icon { display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 18px; border-radius: 12px; color: #fff; background: var(--coral); font-size: 20px; font-weight: 900; }
.feature-card:nth-child(2) .feature-icon { background: var(--orange); color: var(--ink); }
.feature-card:nth-child(3) .feature-icon { background: var(--rose); }
.feature-card h3 { font-size: 20px; }
.feature-card p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.feature-card a { display: inline-flex; margin-top: 14px; color: var(--coral); font-size: 13px; font-weight: 800; }

.stats-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 26px; border: 1px solid var(--line); background: var(--line); }
.stat { padding: 20px; background: #fff; }
.stat strong { display: block; font-size: 30px; line-height: 1; }
.stat span { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; }

.screens { display: grid; grid-template-columns: repeat(3, 1fr); align-items: start; gap: 24px; }
.screen-item { padding: 12px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.screen-item:nth-child(2) { margin-top: 44px; }
.screen-item:nth-child(3) { margin-top: 18px; }
.screen-item img { width: 100%; max-width: 400px; margin: 0 auto; border-radius: 12px; }
.screen-item figcaption { padding: 14px 4px 4px; color: var(--muted); font-size: 13px; }

.quote-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 18px; }
.quote-card { padding: 28px; border-radius: 18px; background: var(--ink); color: #fff; }
.quote-card blockquote { margin: 0; font-size: 22px; line-height: 1.55; font-weight: 700; }
.quote-card cite { display: block; margin-top: 22px; color: #ffc39e; font-size: 13px; font-style: normal; }
.quote-side { display: grid; gap: 12px; }
.mini-quote { padding: 19px; border: 1px solid var(--line); border-radius: 14px; background: #fff; color: var(--muted); font-size: 14px; }
.mini-quote strong { display: block; margin-bottom: 5px; color: var(--ink); font-size: 15px; }

.cta-band { padding: 58px 0; color: #fff; background: var(--coral); }
.cta-band-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.cta-band h2 { max-width: 630px; font-size: clamp(28px, 4vw, 44px); }
.cta-band .button-primary { background: #fff; color: var(--ink); }
.cta-band .button-primary:hover { background: var(--orange); }

.page-hero { padding: 64px 0 52px; background: var(--cream); border-bottom: 1px solid var(--line); }
.page-hero h1 { margin-top: 12px; font-size: clamp(34px, 5vw, 58px); }
.page-hero .lead { max-width: 760px; margin: 18px 0 0; color: var(--muted); font-size: 17px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 46px; align-items: start; }
.article-main { min-width: 0; }
.article-main h2 { margin-top: 46px; padding-bottom: 12px; border-bottom: 2px solid var(--line); font-size: 30px; }
.article-main h3 { margin-top: 24px; font-size: 20px; }
.article-main p { color: var(--muted); }
.guide-grid { display: grid; gap: 14px; margin-top: 22px; }
.step-card { display: grid; grid-template-columns: 58px 1fr; gap: 16px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.step-no { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 50%; color: #fff; background: var(--coral); font-weight: 900; }
.step-card:nth-child(even) .step-no { background: var(--orange); color: var(--ink); }
.step-card h3 { margin-top: 0; }
.step-card p { margin: 6px 0 0; font-size: 14px; }
.tip-box { margin-top: 24px; padding: 20px 22px; border-left: 4px solid var(--orange); background: #fff7dd; color: #6b4d2d; }
.faq-list { display: grid; gap: 10px; margin-top: 22px; }
details { border: 1px solid var(--line); border-radius: 12px; background: #fff; }
summary { cursor: pointer; padding: 17px 20px; font-weight: 800; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; color: var(--coral); font-size: 20px; line-height: 1; }
details[open] summary::after { content: "-"; }
details p { margin: 0; padding: 0 20px 18px; font-size: 14px; }
.article-aside { position: sticky; top: 102px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--cream); }
.article-aside h3 { font-size: 17px; }
.article-aside ul { margin: 14px 0 0; padding: 0; list-style: none; }
.article-aside li + li { margin-top: 9px; }
.article-aside a { color: var(--muted); font-size: 13px; }
.article-aside a:hover { color: var(--coral); }

.site-footer { padding: 42px 0 26px; border-top: 1px solid var(--line); background: #241b1b; color: #fff7ef; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
.site-footer h3 { font-size: 17px; }
.site-footer p, .site-footer a { color: #d7c3ba; font-size: 13px; }
.site-footer p { margin: 10px 0 0; }
.footer-links { display: grid; gap: 8px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 34px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.16); color: #ad958b; font-size: 12px; }
.disclaimer { max-width: 620px; }

@media (max-width: 820px) {
  .main-nav { gap: 14px; }
  .nav-cta { display: none; }
  .hero-grid, .quote-grid, .article-layout { grid-template-columns: 1fr; }
  .hero { padding-top: 58px; }
  .hero-art { min-height: 330px; }
  .article-aside { position: static; order: -1; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .screens { gap: 12px; }
  .screen-item:nth-child(2), .screen-item:nth-child(3) { margin-top: 22px; }
  .cta-band-inner { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .container { width: min(100% - 28px, 1120px); }
  .nav-wrap { min-height: 66px; gap: 12px; }
  .brand { font-size: 17px; }
  .brand img { width: 36px; height: 36px; }
  .main-nav { margin-left: auto; gap: 11px; font-size: 12px; }
  .main-nav a:nth-child(3) { display: none; }
  .hero h1 { font-size: 42px; }
  .hero-copy { font-size: 15px; }
  .hero-art { min-height: 290px; }
  .phone-stack { transform: scale(.82); transform-origin: center top; }
  .section { padding: 60px 0; }
  .section-head { display: block; }
  .section-head .head-note { margin-top: 12px; }
  .feature-grid, .screens, .stats-strip { grid-template-columns: 1fr; }
  .screen-item:nth-child(2), .screen-item:nth-child(3) { margin-top: 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { display: block; }
  .footer-bottom > * + * { margin-top: 10px; }
  .step-card { grid-template-columns: 46px 1fr; padding: 16px; }
}