@charset "UTF-8";

:root {
  --paper: #fbf4f2;
  --paper-deep: #f2e3e1;
  --ink: #241220;
  --plum: #2b1024;
  --muted: #7a6468;
  --line: #e7d3d2;
  --accent: #d8456b;
  --accent-deep: #a3133f;
  --white: #fffaf9;
  --shell: 1200px;
  --header-height: 74px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 18px); }
body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
svg { display: block; }
.page-shell { width: min(calc(100% - 48px), var(--shell)); margin: 0 auto; }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 15px;
  color: var(--accent-deep);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.7px;
  line-height: 1.4;
}
.eyebrow::before { width: 22px; height: 1px; content: ""; background: currentColor; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(251, 244, 242, .96);
  backdrop-filter: blur(14px);
}
.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(calc(100% - 48px), var(--shell));
  min-height: var(--header-height);
  margin: 0 auto;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; flex: none; gap: 10px; font-size: 21px; font-weight: 900; letter-spacing: -.5px; }
.brand img { width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 6px; object-fit: contain; background: #fff; }
.primary-nav { margin-left: auto; }
.primary-nav ul { display: flex; align-items: center; gap: clamp(16px, 2.2vw, 30px); padding: 0; margin: 0; list-style: none; }
.primary-nav a { position: relative; display: block; padding: 8px 0; font-size: 13px; font-weight: 700; }
.primary-nav a::after { position: absolute; right: 0; bottom: 2px; left: 0; height: 2px; content: ""; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .18s ease; }
.primary-nav a:hover::after { transform: scaleX(1); }
.nav-actions { display: flex; align-items: center; flex: none; gap: 12px; }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  gap: 8px;
  padding: 0 17px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  white-space: nowrap;
  transition: background .18s ease, border-color .18s ease;
}
.nav-download:hover { border-color: var(--accent-deep); background: var(--accent-deep); }
.nav-download svg, .button svg { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 0; border: 1px solid var(--ink); border-radius: 4px; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 18px; height: 2px; margin: 5px auto; background: var(--ink); transition: transform .18s ease; }
.menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* hero */
.hero { position: relative; overflow: hidden; padding: 62px 0 0; background: var(--paper); }
.hero::before {
  position: absolute;
  top: -220px;
  right: -160px;
  width: 640px;
  height: 640px;
  content: "";
  border-radius: 50%;
  background: radial-gradient(circle, rgba(216, 69, 107, .16), transparent 64%);
  pointer-events: none;
}
.hero::after {
  position: absolute;
  inset: 0;
  content: "";
  background-image: repeating-linear-gradient(105deg, rgba(43, 16, 36, .035) 0 1px, transparent 1px 34px);
  pointer-events: none;
}
.hero-top {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 400px);
  align-items: center;
  gap: clamp(30px, 5vw, 68px);
  padding-bottom: 56px;
}
.hero h1 { margin: 0; font-size: clamp(56px, 7.2vw, 96px); font-weight: 900; letter-spacing: -3px; line-height: .96; }
.hero-subtitle { margin: 20px 0 0; color: var(--accent-deep); font-size: clamp(20px, 2.2vw, 27px); font-weight: 800; letter-spacing: -.3px; line-height: 1.4; }
.hero-subtitle::after { display: block; width: 66px; height: 5px; margin-top: 14px; content: ""; background: var(--accent); }
.hero-summary { max-width: 470px; margin: 18px 0 28px; color: #6b555b; font-size: 15px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; gap: 18px; padding: 0 26px; border: 1px solid transparent; border-radius: 999px; font-size: 14px; font-weight: 900; transition: transform .18s ease, background .18s ease; }
.button-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(216, 69, 107, .28); }
.button-primary:hover { background: var(--accent-deep); transform: translateY(-2px); }
.text-link { border-bottom: 1px solid rgba(43, 16, 36, .3); font-size: 13px; font-weight: 800; }
.text-link span { display: inline-block; margin-left: 6px; color: var(--accent); }
.hero-notes { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 28px 0 0; list-style: none; }
.hero-notes li { padding: 5px 13px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: #6b555b; font-size: 12px; font-weight: 700; }

.hero-figure {
  position: relative;
  margin: 0;
  padding: 10px 10px 12px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 14px 14px 0 var(--paper-deep);
  transform: rotate(-1.4deg);
}
.hero-figure img { width: 100%; height: clamp(300px, 34vw, 412px); object-fit: cover; object-position: top; }
.hero-figure figcaption { padding: 10px 2px 0; color: var(--muted); font-family: Consolas, monospace; font-size: 10px; letter-spacing: 1.2px; }
.hero-stamp {
  position: absolute;
  top: -15px;
  right: -12px;
  padding: 8px 12px;
  background: var(--plum);
  color: var(--white);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 3px;
  transform: rotate(6deg);
}

.air-band { position: relative; z-index: 2; padding: 26px 0 30px; background: var(--plum); color: var(--white); }
.air-inner { display: grid; grid-template-columns: 230px minmax(0, 1fr); align-items: center; gap: 26px; }
.air-head b { display: block; font-size: 15px; font-weight: 900; letter-spacing: .4px; }
.air-head span { display: block; margin-top: 5px; color: #b79aa3; font-size: 11px; letter-spacing: .5px; }
.air-rail { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); padding: 0; margin: 0; list-style: none; border-left: 1px solid rgba(255, 255, 255, .16); }
.air-rail li { padding: 2px 14px; border-right: 1px solid rgba(255, 255, 255, .16); }
.air-rail span { display: block; color: #b79aa3; font-size: 11px; }
.air-rail b { display: block; margin: 4px 0 2px; font-family: Consolas, monospace; font-size: 20px; font-weight: 700; letter-spacing: -.5px; }
.air-rail small { color: var(--accent); font-size: 11px; }

/* shared heading */
.section-heading { margin-bottom: 34px; }
.section-heading h2, .download h2 { margin: 0; font-size: clamp(28px, 3.2vw, 41px); font-weight: 900; letter-spacing: -1px; line-height: 1.24; }
.section-heading > p:last-child { max-width: 640px; margin: 13px 0 0; color: var(--muted); font-size: 14px; }
.section-heading-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(270px, 380px); align-items: end; gap: 28px; }
.section-heading-split > p:last-child { margin: 0 0 4px; }

/* features */
.features { padding: 78px 0 82px; background: #fff; }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 2px solid var(--ink); }
.feature-card { padding: 30px 28px 34px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-card:first-child { border-left: 1px solid var(--line); }
.feature-no { display: block; margin-bottom: 20px; color: var(--accent); font-family: Consolas, monospace; font-size: 12px; font-weight: 700; letter-spacing: 2px; }
.feature-card h3 { margin: 0 0 9px; font-size: 19px; font-weight: 900; letter-spacing: -.2px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; }

/* shots */
.shots { padding: 78px 0 96px; background: var(--paper); }
.shot-board { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; align-items: start; }
.shot-card { margin: 0; padding: 9px 9px 12px; border: 1px solid var(--line); background: #fff; box-shadow: 0 14px 26px rgba(43, 16, 36, .06); }
.shot-card:nth-child(even) { margin-top: 36px; }
.shot-card img { width: 100%; aspect-ratio: 9 / 16; object-fit: cover; object-position: top; }
.shot-card figcaption { display: flex; align-items: baseline; gap: 9px; padding-top: 10px; font-size: 12px; font-weight: 700; }
.shot-card figcaption b { color: var(--accent); font-family: Consolas, monospace; font-size: 11px; letter-spacing: 1px; }

/* faq */
.faq { padding: 80px 0 84px; background: #fff; }
.faq-layout { display: grid; grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: clamp(30px, 6vw, 78px); }
.faq-heading { align-self: start; }
.faq-note { display: inline-flex; margin-top: 20px; padding: 5px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--accent-deep); font-size: 11px; font-weight: 800; letter-spacing: .6px; }
.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 19px 0; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary h3 { margin: 0; font-size: 16px; font-weight: 800; line-height: 1.5; }
.faq-list summary span { position: relative; flex: none; width: 15px; height: 15px; }
.faq-list summary span::before, .faq-list summary span::after { position: absolute; top: 50%; left: 0; width: 15px; height: 2px; content: ""; background: var(--accent); transition: transform .18s ease, opacity .18s ease; }
.faq-list summary span::after { transform: rotate(90deg); }
.faq-list details[open] summary span::after { opacity: 0; transform: rotate(0); }
.faq-list details p { margin: 0; padding: 0 0 19px; color: var(--muted); font-size: 14px; }
.official-link { display: inline-flex; align-items: center; gap: 7px; margin: -4px 0 20px; padding: 8px 16px; border: 1px solid var(--accent); border-radius: 999px; color: var(--accent-deep); font-size: 12px; font-weight: 800; }
.official-link:hover { background: var(--accent); color: #fff; }

/* reviews */
.reviews { padding: 80px 0 84px; background: var(--paper); }
.review-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.review-card { padding: 22px 22px 24px; border: 1px solid var(--line); background: #fff; }
.review-top { display: flex; align-items: center; gap: 11px; margin-bottom: 13px; }
.avatar { display: grid; flex: none; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--plum); color: var(--white); font-size: 14px; font-weight: 800; }
.review-top strong { display: block; font-size: 14px; line-height: 1.4; }
.review-top time { display: block; color: #a08890; font-family: Consolas, monospace; font-size: 10px; letter-spacing: .2px; }
.review-card > p { margin: 0; color: #4d3941; font-size: 13.5px; }
.review-card a { color: var(--accent-deep); border-bottom: 1px solid rgba(163, 19, 63, .3); }

/* steps */
.steps { padding: 80px 0 84px; background: var(--plum); color: var(--white); }
.steps .eyebrow { color: #ee9db2; }
.steps .section-heading > p:last-child { color: #c3a8b1; }
.step-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); padding: 0; margin: 0; list-style: none; border-top: 1px solid rgba(255, 255, 255, .18); }
.step-list li { padding: 28px 26px 4px; border-right: 1px solid rgba(255, 255, 255, .18); }
.step-list li:last-child { border-right: 0; }
.step-no { display: block; color: rgba(255, 255, 255, .24); font-family: Consolas, monospace; font-size: 42px; font-weight: 700; line-height: 1; }
.step-list h3 { margin: 16px 0 8px; font-size: 18px; font-weight: 900; }
.step-list p { margin: 0; color: #d6bfc6; font-size: 13.5px; }

/* download */
.download { padding: 76px 0; background: #fff; }
.download-inner { position: relative; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 28px; padding: 38px 40px; border: 2px solid var(--ink); background: var(--paper); overflow: hidden; }
.download-copy { position: relative; z-index: 2; }
.download-copy p:last-child { margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.button-light { position: relative; z-index: 2; background: var(--accent); color: #fff; }
.button-light:hover { background: var(--accent-deep); transform: translateY(-2px); }
.download-mark { position: absolute; right: 26px; bottom: -26px; color: rgba(216, 69, 107, .1); font-size: 120px; font-weight: 900; letter-spacing: -8px; line-height: 1; pointer-events: none; }

/* footer */
.site-footer { padding: 46px 0 42px; background: #1c0b18; color: #cbb8bf; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: start; gap: 22px 40px; }
.footer-brand strong { display: block; color: #fff; font-size: 18px; font-weight: 900; }
.footer-brand p { margin: 6px 0 0; color: #9d838c; font-size: 12px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 13px; }
.footer-nav a:hover { color: #fff; }
.footer-meta { display: flex; grid-column: 1 / -1; flex-wrap: wrap; gap: 8px 18px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .12); font-size: 12px; }
.footer-meta a:hover { color: #fff; }
.disclaimer { grid-column: 1 / -1; margin: 0; color: #8e747d; font-size: 11.5px; line-height: 1.7; }

/* responsive */
@media (max-width: 1080px) {
  .hero-top { grid-template-columns: minmax(0, 1fr) minmax(300px, 350px); }
  .air-inner { grid-template-columns: 1fr; gap: 16px; }
  .shot-card img { aspect-ratio: 4 / 5; }
  .review-card { padding: 20px 18px 22px; }
}

@media (max-width: 900px) {
  .primary-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    padding: 8px 24px 18px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: 0 22px 30px rgba(43, 16, 36, .08);
  }
  .primary-nav.is-open { display: block; }
  .primary-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
  .primary-nav a::after { display: none; }
  .menu-toggle { display: block; }
  .hero-top { grid-template-columns: 1fr; gap: 42px; padding-bottom: 46px; }
  .hero-figure { width: 100%; max-width: 420px; margin: 0 auto; transform: none; }
  .hero-figure img { height: 340px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card, .feature-card:first-child { border-left: 1px solid var(--line); }
  .shot-board { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .shot-card:nth-child(even) { margin-top: 0; }
  .shot-card img { aspect-ratio: 9 / 14; }
  .faq-layout { grid-template-columns: 1fr; gap: 24px; }
  .review-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step-list { grid-template-columns: 1fr; }
  .step-list li { padding: 24px 4px 26px; border-right: 0; border-bottom: 1px solid rgba(255, 255, 255, .18); }
  .step-list li:last-child { border-bottom: 0; }
  .download-inner { padding: 32px 26px; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .page-shell, .nav-shell { width: calc(100% - 36px); }
  .hero { padding-top: 44px; }
  .hero h1 { font-size: clamp(44px, 12vw, 62px); letter-spacing: -2px; }
  .hero-subtitle { font-size: 19px; }
  .hero-figure img { height: 300px; }
  .air-rail { display: flex; overflow-x: auto; border-left: 0; scrollbar-width: thin; }
  .air-rail li { flex: 0 0 92px; padding: 2px 12px 4px; border-left: 1px solid rgba(255, 255, 255, .16); }
  .air-rail li:last-child { border-right: 1px solid rgba(255, 255, 255, .16); }
  .section-heading-split { grid-template-columns: 1fr; gap: 10px; }
  .section-heading-split > p:last-child { margin: 0; }
  .shot-board { gap: 12px; }
  .shot-card { padding: 7px 7px 10px; }
  .shot-card figcaption { font-size: 11px; gap: 6px; }
  .review-grid { grid-template-columns: 1fr; }
  .download-inner { padding: 28px 20px; }
  .download-mark { right: 10px; font-size: 84px; }
  .button { width: 100%; }
  .footer-nav { gap: 8px 16px; }
}

@media (max-width: 400px) {
  .nav-shell { gap: 10px; }
  .nav-actions { gap: 8px; }
  .nav-download { padding: 0 10px; gap: 5px; font-size: 11.5px; }
  .nav-download svg { width: 16px; height: 16px; }
  .brand { font-size: 18px; gap: 8px; }
  .brand img { width: 34px; height: 34px; }
  .hero-notes { gap: 6px; }
  .shot-card img { aspect-ratio: 3 / 4; }
}

@media (max-width: 360px) {
  .brand { font-size: 16px; gap: 6px; }
  .brand img { width: 30px; height: 30px; }
  .menu-toggle { width: 38px; height: 38px; }
}