:root {
  --bg: #ffffff;
  --bg-soft: #f6f6f9;
  --surface: #ffffff;
  --surface-2: #f4f4f7;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);

  --primary: #ff7ab8;
  --accent: #ff5fa6;            
  --grad: linear-gradient(135deg, #ff9ecf 0%, #ff7ab8 100%);

  --text: #1b1b22;
  --text-dim: #5b5b68;
  --text-mute: #8a8a98;

  --radius-card: 24px;
  --radius-btn: 16px;
  --shadow-card: 0 8px 30px rgba(30, 20, 50, 0.07);
  --shadow-soft: 0 14px 44px rgba(30, 20, 50, 0.12);
  --shadow-glow: 0 10px 30px rgba(255, 122, 184, 0.30);

  --maxw: 1160px;
  --header-h: 68px;
  --font: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background-color: var(--bg);
  
  background-image:
    radial-gradient(ellipse 1400px 800px at 50% -200px, rgba(255, 122, 184, 0.10) 0%, transparent 60%),
    radial-gradient(ellipse 1200px 700px at 50% 115vh, rgba(255, 158, 207, 0.07) 0%, transparent 55%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 700; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 820px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px; border-radius: var(--radius-btn);
  font-weight: 700; font-size: 15px; cursor: pointer;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s ease, background .2s;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: var(--shadow-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px rgba(255, 122, 184, 0.45); }
.btn-ghost { background: var(--surface-2); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: #ececf2; transform: translateY(-2px); }
.btn-sm { padding: 9px 18px; font-size: 14px; }

.btn-row { display: flex; flex-direction: row; gap: 14px; flex-wrap: wrap; margin: 22px 0 8px; }
.btn-row > * { flex: 1 1 0; }

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background .25s;
}
.site-header.scrolled { border-bottom-color: var(--border); background: rgba(255, 255, 255, 0.92); }
.nav { display: flex; align-items: center; gap: 18px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 900; }
.brand-logo { width: 40px; height: 40px; border-radius: 10px; object-fit: cover; }
.brand-name { font-size: 22px; letter-spacing: .5px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--text-dim); font-size: 15px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta { margin-left: 8px; }
.menu-toggle { display: none; background: none; border: none; color: var(--text); font-size: 26px; cursor: pointer; padding: 4px; }

.mobile-menu { display: none; flex-direction: column; gap: 4px; padding: 12px 20px 20px;
  background: rgba(255, 255, 255, 0.97); border-bottom: 1px solid var(--border); }
.mobile-menu a { padding: 12px 4px; color: var(--text-dim); border-bottom: 1px solid var(--surface-2); }
.mobile-menu .btn { margin-top: 10px; }

.section { padding: 84px 0; }
.section-title { text-align: center; font-size: clamp(26px, 4vw, 38px); font-weight: 900; }
.section-sub { text-align: center; color: var(--text-dim); margin: -4px auto 40px; font-size: 17px; }

.hero { padding: calc(var(--header-h) + 56px) 0 72px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center; }
.badge { display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: rgba(255, 122, 184, 0.12); border: 1px solid rgba(255, 122, 184, 0.30);
  color: var(--accent); font-size: 13px; font-weight: 600; margin-bottom: 18px; }
.hero h1 { font-size: clamp(32px, 5.2vw, 56px); font-weight: 900; letter-spacing: -.5px; color: var(--text); }
.lead { font-size: 18px; color: var(--text-dim); max-width: 520px; }
.stats { list-style: none; display: flex; gap: 30px; padding: 0; margin: 30px 0 0; flex-wrap: wrap; }
.stats li { display: flex; flex-direction: column; }
.stats strong { font-size: 28px; font-weight: 900;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stats span { font-size: 13px; color: var(--text-mute); }
.hero-visual { display: flex; justify-content: center; }
.hero-visual img { width: 320px; max-width: 78%; height: auto; border-radius: 28px; box-shadow: var(--shadow-soft); }

.preview-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.preview-card { margin: 0; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 14px; text-align: center; box-shadow: var(--shadow-card);
  transition: transform .2s, border-color .2s, box-shadow .2s; }
.preview-card:hover { transform: translateY(-4px); border-color: rgba(255, 122, 184, 0.45); box-shadow: 0 14px 40px rgba(255, 122, 184, 0.16); }
.preview-card img { width: 100%; border-radius: 16px; aspect-ratio: 1 / 2; object-fit: cover; }
.preview-card figcaption { margin-top: 12px; font-weight: 600; color: var(--text); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card { background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 30px 26px; box-shadow: var(--shadow-card);
  transition: transform .2s, border-color .2s, box-shadow .2s; }
.feature-card:hover { transform: translateY(-4px); border-color: rgba(255, 122, 184, 0.5); box-shadow: 0 14px 40px rgba(255, 122, 184, 0.14); }
.feature-card i { font-size: 34px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.feature-card h3 { font-size: 19px; margin: 14px 0 8px; }
.feature-card p { color: var(--text-dim); font-size: 15px; margin: 0; }

.char-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.char-card { background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-card); overflow: hidden; box-shadow: var(--shadow-card);
  display: flex; flex-direction: column;
  transition: transform .2s, border-color .2s, box-shadow .2s; }
.char-card:hover { transform: translateY(-4px); border-color: rgba(255, 122, 184, 0.45); box-shadow: 0 16px 42px rgba(255, 122, 184, 0.18); }
.char-media { aspect-ratio: 3 / 4; overflow: hidden; background: var(--surface-2); }
.char-img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.char-card:hover .char-img { transform: scale(1.05); }
.char-body { padding: 18px 20px 22px; display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px; }
.char-card h3 { font-size: 19px; margin: 0; }
.char-tag { font-size: 13px; color: var(--accent); background: rgba(255, 122, 184, 0.12);
  padding: 3px 12px; border-radius: 999px; }
.char-card p { color: var(--text-dim); font-size: 14px; margin: 4px 0 10px; }

.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.review-card { background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 24px; box-shadow: var(--shadow-card); }
.review-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--grad); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; flex: none; }
.review-name { font-weight: 700; font-size: 15px; color: var(--text); }
.stars { color: #ffb020; font-size: 14px; letter-spacing: 2px; }
.review-card p { color: var(--text-dim); font-size: 14px; margin: 0; }

.about-grid { max-width: 880px; margin: 0 auto; }
.about-text { color: var(--text-dim); font-size: 16px; }
.about-text strong { color: var(--text); }
.about .btn { margin-top: 10px; }

.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.guide-card { display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 26px; box-shadow: var(--shadow-card);
  transition: transform .2s, border-color .2s, box-shadow .2s; }
.guide-card:hover { transform: translateY(-4px); border-color: rgba(255, 122, 184, 0.45); box-shadow: 0 14px 40px rgba(255, 122, 184, 0.14); }
.guide-date { font-size: 13px; color: var(--text-mute); }
.guide-card h3 { font-size: 18px; margin: 8px 0 10px; }
.guide-card p { color: var(--text-dim); font-size: 14px; margin: 0; }

.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 4px 20px; box-shadow: var(--shadow-card); transition: border-color .2s; }
.faq-item[open] { border-color: rgba(255, 122, 184, 0.4); }
.faq-item summary { list-style: none; cursor: pointer; font-weight: 600; font-size: 16px;
  display: flex; align-items: center; justify-content: space-between; padding: 16px 0; color: var(--text); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { color: var(--text-mute); transition: transform .25s; }
.faq-item[open] summary i { transform: rotate(180deg); }
.faq-body { color: var(--text-dim); font-size: 15px; padding: 0 0 18px; }

.cta-card { background: linear-gradient(135deg, rgba(255, 122, 184, 0.12), rgba(255, 158, 207, 0.07));
  border: 1px solid rgba(255, 122, 184, 0.28); border-radius: 32px;
  padding: 56px 32px; text-align: center; }
.cta-card h2 { font-size: clamp(26px, 4vw, 36px); }
.cta-card p { color: var(--text-dim); margin-bottom: 26px; }
.store-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.store-btn { display: inline-flex; align-items: center; gap: 10px; padding: 12px 22px;
  border-radius: 14px; background: #fff; border: 1px solid var(--border-strong);
  color: var(--text); font-weight: 700; transition: background .2s, transform .15s, box-shadow .2s; }
.store-btn i { font-size: 22px; }
.store-btn:hover { background: var(--surface-2); transform: translateY(-2px); box-shadow: var(--shadow-card); }

.site-footer { border-top: 1px solid var(--border); padding: 56px 0 28px; margin-top: 40px;
  background: var(--bg-soft); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
.footer-brand .brand-name { font-size: 22px; }
.footer-brand p { color: var(--text-mute); font-size: 14px; margin-top: 10px; max-width: 320px; }
.footer-col h4 { font-size: 14px; color: var(--text); margin-bottom: 14px; }
.footer-col a { display: block; color: var(--text-mute); font-size: 14px; padding: 5px 0; transition: color .2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); }
.footer-bottom p { color: var(--text-mute); font-size: 13px; margin: 0; text-align: center; }

.ph-box { display: flex; align-items: center; justify-content: center; text-align: center;
  background: var(--grad); color: #fff; font-weight: 700; border-radius: inherit; }

.fade-up { opacity: 1; transform: none; }
html.js .fade-up { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
html.js .fade-up.visible { opacity: 1; transform: none; }

.changelog { display: flex; flex-direction: column; gap: 16px; margin-top: 26px; }
.log-item { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 20px 24px 20px 26px; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.log-item::before { content: ""; position: absolute; left: 0; top: 16px; bottom: 16px; width: 4px; border-radius: 4px; background: var(--grad); }
.log-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.log-ver { font-weight: 700; font-size: 13px; color: var(--primary); background: rgba(255, 122, 184, .12); padding: 3px 11px; border-radius: 999px; }
.log-date { color: var(--text-mute); font-size: 13px; }
.log-item h3 { font-size: 17px; margin-bottom: 6px; }
.log-item p { color: var(--text-dim); font-size: 14.5px; line-height: 1.7; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; text-align: center; }
  .hero .lead, .stats { margin-left: auto; margin-right: auto; }
  .btn-row { justify-content: center; }
  .preview-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .char-grid, .guide-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-links, .nav-cta { display: none; }
  .menu-toggle { display: block; margin-left: auto; }
  .mobile-menu.open { display: flex; }
  .section { padding: 56px 0; }
  .feature-grid, .guide-grid { grid-template-columns: 1fr; }
  
  .preview-grid, .char-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-visual img { width: 240px; }
}