@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700;800;900&display=swap");

:root {
  --ink: #3e2b2f;
  --muted: #79656a;
  --cream: #fffaf0;
  --paper: #fffefb;
  --yellow: #ffcb34;
  --coral: #e7785e;
  --pink: #ffd9d0;
  --line: #eaded2;
  --shadow: 0 22px 60px rgba(94, 54, 55, .13);
  --radius: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 12%, rgba(255,203,52,.18), transparent 24rem),
    radial-gradient(circle at 92% 42%, rgba(231,120,94,.13), transparent 26rem),
    var(--cream);
  font-family: "Noto Sans SC", system-ui, sans-serif;
  line-height: 1.7;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 4px; }
.container { width: min(1120px, calc(100% - 36px)); margin-inline: auto; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: #a64d3b;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.eyebrow::before { content: "✦"; color: var(--yellow); font-size: 18px; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 22px; font-size: clamp(42px, 7vw, 78px); line-height: 1.02; letter-spacing: -.055em; }
h2 { margin-bottom: 16px; font-size: clamp(30px, 4.5vw, 48px); line-height: 1.12; letter-spacing: -.04em; }
h3 { margin-bottom: 8px; font-size: 20px; line-height: 1.35; }
.lead { max-width: 680px; color: var(--muted); font-size: clamp(17px, 2vw, 20px); }
.muted { color: var(--muted); }
.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(234,222,210,.8);
  background: rgba(255,250,240,.84);
  backdrop-filter: blur(18px);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 900; font-size: 19px; }
.brand img { width: 44px; height: 44px; border-radius: 14px; box-shadow: 0 7px 18px rgba(231,120,94,.16); }
.brand small { display: block; margin-top: -3px; color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .12em; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 700; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); }
.nav-cta { padding: 11px 18px; border-radius: 999px; color: #fff !important; background: var(--ink); }
.menu-button { display: none; border: 0; background: transparent; font: inherit; font-weight: 800; }
.hero { position: relative; overflow: hidden; padding: 88px 0 70px; }
.hero::after {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  right: -190px;
  top: 60px;
  border: 46px solid rgba(255,203,52,.22);
  border-radius: 50%;
}
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 70px; }
.hero h1 span { color: var(--coral); font-family: Georgia, serif; font-style: italic; font-weight: 500; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 22px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--paper);
  text-decoration: none;
  font-size: 15px;
  font-weight: 800;
  box-shadow: 4px 5px 0 var(--ink);
  transition: transform .2s, box-shadow .2s;
}
.button:hover { transform: translate(2px, 2px); box-shadow: 2px 3px 0 var(--ink); }
.button.primary { color: #fff; background: var(--coral); }
.button.dark { color: #fff; background: var(--ink); }
.microcopy { color: var(--muted); font-size: 13px; }
.microcopy strong { color: var(--ink); }
.phone-scene { position: relative; min-height: 520px; display: grid; place-items: center; }
.phone {
  position: relative;
  z-index: 2;
  width: min(310px, 80vw);
  padding: 15px;
  border: 2px solid var(--ink);
  border-radius: 46px;
  background: #241a1c;
  box-shadow: 22px 28px 0 var(--yellow), var(--shadow);
  transform: rotate(3deg);
}
.phone-screen { min-height: 470px; overflow: hidden; padding: 18px; border-radius: 32px; background: linear-gradient(165deg, #fff9ea, #ffdcd4); }
.phone-top { display: flex; align-items: center; justify-content: space-between; }
.phone-top img { width: 45px; height: 45px; border-radius: 14px; }
.phone-pill { padding: 6px 11px; border-radius: 999px; background: #fff; font-size: 10px; font-weight: 800; }
.cover-main { height: 184px; margin: 18px 0; overflow: hidden; position: relative; border-radius: 26px; background: linear-gradient(135deg, #e7785e 0 52%, #ffcb34 52%); }
.cover-main::before { content: "沉浸 · 新世界"; position: absolute; left: 18px; bottom: 14px; color: #fff; font-family: Georgia, serif; font-size: 26px; font-style: italic; }
.cover-main::after { content: "✦"; position: absolute; right: 22px; top: 8px; color: #fff; font-size: 84px; transform: rotate(12deg); opacity: .65; }
.mini-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; }
.mini-cover { aspect-ratio: .78; padding: 10px; display: flex; align-items: flex-end; border-radius: 16px; color: #fff; font-size: 10px; font-weight: 800; }
.mini-cover:nth-child(1) { background: linear-gradient(145deg,#ffd55f,#e7785e); }
.mini-cover:nth-child(2) { background: linear-gradient(145deg,#7157a7,#f29cb4); }
.mini-cover:nth-child(3) { background: linear-gradient(145deg,#4b8a86,#ffd36b); }
.sticker { position: absolute; z-index: 3; padding: 12px 16px; border: 2px solid var(--ink); border-radius: 18px; background: #fff; box-shadow: 5px 6px 0 var(--ink); font-size: 13px; font-weight: 900; }
.sticker.one { left: 2%; top: 16%; transform: rotate(-8deg); }
.sticker.two { right: 0; bottom: 14%; transform: rotate(7deg); }
.trust-row { display: flex; flex-wrap: wrap; gap: 9px; }
.chip { padding: 8px 13px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.65); font-size: 12px; font-weight: 700; }
.section { padding: 88px 0; }
.section-head { max-width: 720px; margin-bottom: 38px; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature-card {
  min-height: 250px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,.72);
  box-shadow: 0 12px 36px rgba(94,54,55,.06);
}
.feature-card:nth-child(2), .feature-card:nth-child(4) { transform: translateY(24px); }
.feature-icon { width: 48px; height: 48px; margin-bottom: 42px; display: grid; place-items: center; border-radius: 15px; background: var(--yellow); font-size: 22px; }
.feature-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.showcase { overflow: hidden; border-radius: 40px; background: var(--ink); color: #fff; }
.showcase-grid { display: grid; grid-template-columns: .82fr 1.18fr; }
.showcase-copy { padding: clamp(34px, 6vw, 72px); }
.showcase-copy .eyebrow { color: var(--pink); }
.showcase-copy p { color: #d8c9cb; }
.shelves { min-height: 500px; padding: 40px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; background: linear-gradient(135deg, #e7785e, #ffcb34); transform: rotate(2deg) scale(1.03); }
.shelf { min-height: 190px; padding: 20px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid rgba(255,255,255,.6); border-radius: 28px; background: rgba(255,255,255,.23); backdrop-filter: blur(12px); }
.shelf b { font-size: 24px; }
.shelf span { font-size: 13px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; counter-reset: step; }
.step { padding: 28px; border-top: 1px solid var(--line); counter-increment: step; }
.step::before { content: "0" counter(step); display: block; margin-bottom: 26px; color: var(--coral); font-family: Georgia, serif; font-size: 48px; font-style: italic; }
.step p { color: var(--muted); font-size: 14px; }
.faq-list { max-width: 820px; margin: 0 auto; }
details { padding: 21px 0; border-bottom: 1px solid var(--line); }
summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; gap: 20px; font-weight: 800; }
summary::after { content: "+"; font-size: 24px; color: var(--coral); }
details[open] summary::after { content: "−"; }
details p { margin: 14px 36px 0 0; color: var(--muted); font-size: 14px; }
.page-hero { padding: 74px 0 44px; text-align: center; }
.page-hero .lead { margin-inline: auto; }
.page-hero .actions { justify-content: center; }
.guide-layout { display: grid; grid-template-columns: 260px 1fr; gap: 54px; align-items: start; }
.guide-nav { position: sticky; top: 110px; padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: #fff; }
.guide-nav a { display: block; padding: 9px 0; color: var(--muted); text-decoration: none; font-size: 14px; }
.article-card { margin-bottom: 20px; padding: clamp(26px,4vw,44px); border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,.74); }
.article-card ol, .article-card ul { padding-left: 22px; color: var(--muted); }
.notice { padding: 18px 20px; border-left: 4px solid var(--coral); border-radius: 0 18px 18px 0; background: var(--pink); }
.download-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.download-card { padding: 32px; border: 2px solid var(--ink); border-radius: var(--radius); background: #fff; box-shadow: 7px 8px 0 var(--ink); }
.download-card .platform { font-size: 48px; }
.download-card .button { width: 100%; margin-top: 18px; }
.footer { padding: 54px 0 110px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 30px; }
.footer p { max-width: 630px; color: var(--muted); font-size: 12px; }
.footer-links { display: flex; gap: 18px; font-size: 13px; font-weight: 700; }
.sticky-download {
  position: fixed;
  z-index: 90;
  left: 50%;
  bottom: 16px;
  width: min(680px, calc(100% - 24px));
  padding: 10px 11px 10px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 22px;
  color: #fff;
  background: rgba(62,43,47,.94);
  box-shadow: 0 16px 50px rgba(44,25,30,.28);
  backdrop-filter: blur(18px);
  opacity: 0;
  transform: translate(-50%, 30px);
  pointer-events: none;
  transition: .3s ease;
}
.sticky-download.is-visible { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.sticky-download b { display: block; font-size: 14px; }
.sticky-download span { color: #d8c9cb; font-size: 11px; }
.sticky-download .button { min-height: 44px; padding: 9px 18px; border-color: #fff; background: var(--yellow); color: var(--ink); box-shadow: none; white-space: nowrap; }
@media (max-width: 860px) {
  .menu-button { display: block; }
  .nav-links { display: none; position: absolute; inset: 76px 18px auto; padding: 18px; align-items: stretch; flex-direction: column; gap: 8px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 10px; }
  .hero { padding-top: 52px; }
  .hero-grid, .showcase-grid, .guide-layout { grid-template-columns: 1fr; }
  .phone-scene { margin-top: 12px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card:nth-child(n) { transform: none; }
  .guide-nav { display: none; }
}
@media (max-width: 580px) {
  .container { width: min(100% - 24px, 1120px); }
  h1 { font-size: 46px; }
  .section { padding: 64px 0; }
  .feature-grid, .steps, .download-panel { grid-template-columns: 1fr; }
  .feature-card { min-height: auto; }
  .feature-icon { margin-bottom: 28px; }
  .phone-scene { min-height: 470px; }
  .phone { width: 270px; box-shadow: 14px 18px 0 var(--yellow), var(--shadow); }
  .phone-screen { min-height: 410px; }
  .sticker.one { left: 0; top: 5%; }
  .sticker.two { right: 0; bottom: 4%; }
  .shelves { min-height: 450px; padding: 22px; }
  .shelf { min-height: 170px; padding: 16px; }
  .shelf b { font-size: 19px; }
  .footer-grid { grid-template-columns: 1fr; }
  .sticky-download { bottom: 8px; }
  .sticky-download span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}
.app-screenshot { width: 100%; height: 434px; object-fit: cover; object-position: top; border-radius: 23px; }
.image-wall { min-height: 500px; padding: 32px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; background: linear-gradient(135deg, #e7785e, #ffcb34); }
.image-card { position: relative; min-height: 420px; overflow: hidden; border: 2px solid var(--ink); border-radius: 24px; background: #fff; box-shadow: 6px 7px 0 var(--ink); }
.image-card:nth-child(2) { transform: translateY(24px); }
.image-card img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.source-note { margin: 18px 0 0; color: var(--muted); font-size: 11px; }
.source-note a { font-weight: 700; }
@media (max-width: 580px) {
  .app-screenshot { height: 374px; }
  .image-wall { min-height: 430px; padding: 16px; gap: 9px; }
  .image-card { min-height: 350px; border-radius: 16px; box-shadow: 3px 4px 0 var(--ink); }
  .image-card:nth-child(2) { transform: translateY(12px); }
}
.cover-collage { height: 434px; display: grid; grid-template-columns: 1.15fr .85fr; grid-template-rows: 1fr 1fr; gap: 9px; }
.cover-collage img { width: 100%; height: 100%; object-fit: cover; border-radius: 15px; }
.cover-collage img:first-child { grid-row: 1 / 3; }
@media (max-width: 580px) {
  .cover-collage { height: 374px; }
  .image-wall { grid-template-columns: repeat(2, 1fr); }
  .image-card { min-height: 270px; }
}