:root {
  --bg: #fff1f2;
  --ink: #4c0519;
  --accent: #e11d48;
  --soft: #ffe4e6;
  --muted: #9f1239;
  --line: color-mix(in srgb, var(--ink) 14%, transparent);
  --font-d: "Noto Serif SC", "Songti SC", serif;
  --font-u: "Outfit", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--ink); font-family: var(--font-u);
  background: var(--bg); overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.topbar {
  position: fixed; inset: 0 0 auto; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem clamp(1rem, 4vw, 2.5rem);
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid transparent;
}
.topbar.is-scrolled { border-bottom-color: var(--line); }
.logo { display: inline-flex; align-items: center; gap: .55rem; font-family: var(--font-d); font-weight: 700; }
.logo-mark { width: 1rem; height: 1rem; border-radius: 50%; background: var(--accent); }
.nav { display: none; gap: 1.4rem; align-items: center; font-weight: 500; }
.nav a:not(.nav-cta) { color: var(--muted); }
.nav-cta, .btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .85rem 1.25rem; background: #e11d48; color: #fff;
  font-weight: 600; border-radius: 4px; transition: transform .2s var(--ease), opacity .2s;
}
.nav-cta:hover, .btn:hover { transform: translateY(-2px); opacity: .92; }
.menu-btn {
  width: 2.4rem; height: 2.4rem; border: 0; background: transparent; display: flex;
  flex-direction: column; justify-content: center; gap: 6px; cursor: pointer;
}
.menu-btn span { display: block; width: 1.3rem; height: 2px; background: var(--ink); }
.mobile-nav {
  position: fixed; top: 4.2rem; left: 1rem; right: 1rem; z-index: 39;
  display: flex; flex-direction: column; gap: .2rem; padding: .7rem;
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
}
.mobile-nav[hidden] { display: none !important; }
.mobile-nav a { padding: .8rem 1rem; }
@media (min-width: 860px) {
  .nav { display: flex; }
  .menu-btn, .mobile-nav { display: none !important; }
}
.section { padding: clamp(3rem, 8vw, 5.5rem) clamp(1rem, 4vw, 2.5rem); }
.section h2 {
  margin: 0 0 .7rem; font-family: var(--font-d);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
}
.section .lead { margin: 0 0 1.8rem; color: var(--muted); line-height: 1.7; max-width: 36rem; }
.features {
  display: grid; gap: 1.2rem;
}
@media (min-width: 800px) { .features { grid-template-columns: repeat(3, 1fr); gap: 1.5rem; } }
.feature h3 { margin: .4rem 0; font-family: var(--font-d); }
.feature p { margin: 0; color: var(--muted); line-height: 1.65; }
.feature-i { color: var(--accent); font-family: var(--font-d); font-weight: 700; }
.guide-box {
  padding: clamp(1.6rem, 4vw, 2.5rem); background: var(--soft); border: 1px solid var(--line);
}
.steps { list-style: none; margin: 0 0 1.5rem; padding: 0; display: grid; gap: 1rem; }
@media (min-width: 800px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li { display: grid; gap: .6rem; }
.step-n {
  width: 2.3rem; height: 2.3rem; display: grid; place-items: center;
  background: var(--ink); color: var(--bg); font-family: var(--font-d); font-weight: 700;
}
.seo p { color: var(--muted); line-height: 1.85; }
.closing { text-align: center; padding: clamp(3rem, 8vw, 5rem) 1rem; border-top: 1px solid var(--line); }
.closing-brand { margin: 0; font-family: var(--font-d); font-weight: 900; font-size: clamp(2.4rem, 7vw, 4rem); }
.closing-line { color: var(--muted); margin: .6rem 0 1.4rem; }
.footer {
  text-align: center; padding: 2rem 1rem 2.5rem; color: var(--muted); font-size: .9rem;
}
.reveal { opacity: 0; transform: translateY(22px); transition: .8s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@keyframes rise { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  * { animation: none !important; transition: none !important; }
}

.hero { min-height:100svh; display:grid; align-items:center; padding:5.5rem 1.2rem 2rem; gap:1.5rem; }
@media(min-width:900px){ .hero{grid-template-columns:1fr 1fr;} }
.hero-img { border-radius:40% 40% 8px 8px / 28% 28% 8px 8px; overflow:hidden; border:2px solid var(--ink); }
.hero-img img { width:100%; aspect-ratio:3/4; object-fit:cover; }
.brand-en { color:var(--accent); letter-spacing:.35em; font-weight:700; }
.brand { font-family:var(--font-d); font-size:clamp(3.2rem,11vw,5.8rem); margin:.2rem 0; }
.headline { font-family:var(--font-d); color:var(--accent); }
.lede { color:var(--muted); line-height:1.75; }
.cta-row { display:flex; gap:.8rem; flex-wrap:wrap; margin-top:1.1rem; }
.heart-row { display:grid; grid-template-columns:1.3fr 1fr 1.1fr; gap:.7rem; }
.heart-row img { width:100%; aspect-ratio:3/4; object-fit:cover; border-radius:12px; }
@media(max-width:700px){ .heart-row{grid-template-columns:1fr;} }