:root {
  color-scheme: light;
  --paper: #fbf8f4;
  --ink: #292324;
  --quiet: #615450;
  --accent: #ad3150;
  --accent-dark: #8d2440;
  --line: #ded3ce;
  --blush: #f7eae5;
  --serif: 'Songti SC', 'Noto Serif CJK SC', SimSun, serif;
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
}

*, *::before, *::after { box-sizing: border-box; }
body, h1, h2, h3, p, dl, dd, figure { margin: 0; }
img { display: block; max-width: 100%; }
a { color: inherit; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.shell { width: min(1200px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 2; padding: 10px 16px; background: white; transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header { min-height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 9px; min-height: 44px; text-decoration: none; }
.brand img { object-fit: contain; mix-blend-mode: multiply; }
.brand span { font-size: 22px; font-weight: 750; white-space: nowrap; letter-spacing: .08em; }
.site-header nav { display: flex; flex-wrap: wrap; column-gap: clamp(16px, 3.4vw, 46px); }
.site-header nav a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; font-size: 14px; font-weight: 600; }
.site-header nav a:hover { color: var(--accent-dark); text-decoration: underline; text-underline-offset: .3em; }

.hero-card { position: relative; isolation: isolate; min-height: clamp(480px, 50vw, 630px); display: grid; align-items: center; overflow: hidden; border-radius: 24px; background: #292f27; }
.hero-photo, .hero-card::after { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-photo { z-index: -2; object-fit: cover; object-position: 68% 58%; }
.hero-card::after { z-index: -1; content: ''; background: linear-gradient(90deg, rgb(21 25 22 / .84), rgb(23 27 24 / .62) 40%, transparent 78%); }
.hero-copy { padding: 62px clamp(36px, 6.5vw, 90px); color: #fff; }
.hero-label { font-size: 14px; font-weight: 600; letter-spacing: .16em; margin-bottom: 21px; }
.hero h1 { font-family: var(--serif); font-size: clamp(52px, 6.1vw, 86px); font-weight: 700; line-height: 1.18; letter-spacing: .025em; }
.hero-description { max-width: 30ch; margin-top: 24px; font-size: clamp(16px, 1.6vw, 19px); line-height: 1.75; }
.button { display: inline-flex; gap: 18px; align-items: center; min-height: 49px; margin-top: 28px; padding: 10px 18px; border-radius: 6px; background: #fff7f3; color: var(--accent-dark); text-decoration: none; font-weight: 700; transition: background-color .18s ease; }
.button:hover { background: #f9dedc; }
.button:focus-visible { outline-color: #fff; }

.section { padding-block: clamp(56px, 7.6vw, 104px); }
.section-intro { margin-bottom: clamp(26px, 4vw, 48px); }
h2 { font-family: var(--serif); font-size: clamp(30px, 4vw, 52px); font-weight: 700; letter-spacing: .02em; line-height: 1.28; }
.section-intro p, .app-copy > p:not(.preview-label) { color: var(--quiet); margin-top: 14px; font-size: 17px; }
.scenes-layout { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(26px, 6vw, 88px); }
.scene-photo { position: relative; min-height: 365px; border-radius: 14px; overflow: hidden; background: #36444d; }
.scene-photo img { position: absolute; width: 100%; height: 100%; object-fit: cover; object-position: center 63%; }
.scene-list { align-self: center; border-top: 1px solid var(--line); }
.scene-list > div { display: grid; grid-template-columns: minmax(88px, 1fr) 3.3fr; gap: 12px; align-items: baseline; padding-block: 20px; border-bottom: 1px solid var(--line); }
.scene-list dt { font-size: 16px; font-weight: 700; }
.scene-list dd, .steps p, .faq-list p { color: var(--quiet); }

.workflow { background: var(--blush); }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(22px, 3.4vw, 52px); padding: 0; margin: 0; list-style: none; }
.steps li { padding: 20px 0 4px; border-top: 1px solid #cdb6ac; }
.step-number { display: block; font-family: Georgia, serif; color: var(--accent-dark); font-size: 28px; line-height: 1.2; margin-bottom: 16px; }
.steps h3 { margin-bottom: 9px; line-height: 1.35; font-size: 21px; }

.app-preview { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); align-items: center; gap: clamp(26px, 4vw, 65px); background: #f1e7e1; border-radius: 24px; padding: clamp(24px, 5.4vw, 72px); }
.preview-label { margin-bottom: 15px; font-size: 14px; font-weight: 700; letter-spacing: .12em; color: var(--accent-dark); }
.app-copy > p:not(.preview-label) { max-width: 32ch; }
.text-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; margin-top: 12px; color: var(--accent-dark); font-weight: 700; text-underline-offset: .3em; }
.phones { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(10px, 2.3vw, 30px); align-items: center; }
.phone img { width: 100%; height: auto; aspect-ratio: 375 / 812; border: 4px solid #403537; border-radius: clamp(12px, 2vw, 22px); background: var(--paper); box-shadow: 0 12px 24px rgb(74 43 38 / .13); }
.phone figcaption { margin-top: 9px; text-align: center; color: var(--quiet); font-size: 14px; }

.faq { display: grid; grid-template-columns: minmax(175px, .9fr) minmax(0, 2fr); gap: 24px; padding-top: 0; }
.faq .section-intro { margin: 0; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 14px; min-height: 52px; padding-block: 13px; font-weight: 700; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; flex: none; color: var(--accent); font-size: 22px; line-height: 1; font-weight: 400; }
.faq-list details[open] summary::after { content: '−'; }
.faq-list p { max-width: 44ch; padding-bottom: 16px; }

.site-footer { border-top: 1px solid var(--line); background: #f4eeea; }
.footer-inner { display: grid; justify-items: center; text-align: center; padding-block: 30px; }
.footer-inner p { color: var(--quiet); font-size: 14px; margin-top: 6px; }
.filing { display: inline-flex; align-items: center; min-height: 44px; color: var(--accent-dark); font-size: 14px; text-underline-offset: .23em; }

@media (max-width: 850px) {
  .shell { width: calc(100% - 48px); }
  .hero-photo { object-position: 74% 58%; }
  .scenes-layout { gap: 24px; grid-template-columns: .85fr 1.15fr; }
  .scene-list > div { grid-template-columns: 1fr; gap: 3px; padding-block: 12px; }
}

@media (max-width: 600px) {
  .shell { width: calc(100% - 32px); }
  .site-header { align-items: start; flex-direction: column; gap: 0; padding-block: 10px 7px; }
  .site-header nav { width: 100%; justify-content: space-between; column-gap: 8px; }
  .hero-card { min-height: 495px; align-items: end; border-radius: 15px; }
  .hero-photo { object-position: 80% 59%; }
  .hero-card::after { background: linear-gradient(0deg, rgb(20 25 21 / .95), rgb(20 25 21 / .83) 30%, rgb(20 25 21 / .70) 53%, transparent 82%); }
  .hero-copy { padding: 24px 20px; }
  .hero-label { margin-bottom: 12px; }
  .hero h1 { font-size: clamp(38px, 11vw, 58px); }
  .hero-description { margin-top: 12px; }
  .button { margin-top: 17px; }
  .scenes-layout, .steps, .app-preview, .faq { grid-template-columns: minmax(0, 1fr); }
  .scene-photo { min-height: 210px; }
  .scene-list > div { grid-template-columns: 5.5em minmax(0, 1fr); column-gap: 10px; }
  .step-number { margin-bottom: 8px; }
  .app-preview { border-radius: 14px; }
  .faq { gap: 20px; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  .button { transition: none; }
}