:root {
  --navy: #17233f;
  --navy-soft: #33405b;
  --pink: #f5a9b8;
  --pink-pale: #fff1f4;
  --pink-faint: #fff8f9;
  --paper: #fffdfd;
  --line: #eadfe2;
  --muted: #687083;
  --shadow: 0 12px 28px rgba(29, 36, 63, 0.045);
  color-scheme: light;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--navy); background: var(--paper); line-height: 1.75; }
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--pink); outline-offset: 4px; border-radius: 4px; }
svg { display: block; }
.shell { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 10; top: 10px; left: 10px; padding: 9px 13px; border-radius: 8px; background: var(--navy); color: #fff; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header { border-bottom: 1px solid rgba(234, 223, 226, 0.8); background: rgba(255, 253, 253, 0.94); }
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 800; letter-spacing: .02em; }
.brand-mark { width: 34px; height: 34px; flex: none; }
.nav-links { display: flex; align-items: center; gap: 26px; font-size: .88rem; font-weight: 700; }
.nav-links a { text-decoration: none; border-bottom: 1px solid transparent; }
.nav-links a:hover { border-color: var(--pink); }
.external::after { content: " ↗"; color: #c56f82; }

.hero { padding: 88px 0 78px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 360px; align-items: center; gap: 80px; }
.eyebrow { margin: 0 0 16px; color: #b65e73; font-size: .78rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
h1 { margin: 0; max-width: 760px; font-size: clamp(2.45rem, 6vw, 4.7rem); line-height: 1.14; letter-spacing: -.045em; }
.hero-copy { margin: 25px 0 0; max-width: 620px; color: var(--navy-soft); font-size: clamp(1rem, 1.7vw, 1.15rem); }
.panda-wrap { position: relative; display: grid; place-items: center; min-height: 330px; }
.panda-blob { position: absolute; width: 315px; height: 315px; border-radius: 43% 57% 48% 52% / 53% 40% 60% 47%; background: var(--pink-pale); transform: rotate(8deg); }
.panda { position: relative; width: 250px; filter: drop-shadow(0 20px 20px rgba(23,35,63,.1)); }

.tools-section { padding: 76px 0 100px; background: var(--pink-faint); border-block: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 34px; }
.section-heading h2, .howto h2, .about h2 { margin: 0; font-size: clamp(1.75rem, 3vw, 2.35rem); letter-spacing: -.03em; }
.section-heading p { margin: 0 0 4px; color: var(--muted); font-size: .9rem; }
.tool-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.tool-card { position: relative; min-width: 0; padding: 26px; border: 1px solid var(--line); border-radius: 24px; background: #fff; box-shadow: var(--shadow); }
.card-top { display: flex; align-items: start; justify-content: space-between; gap: 18px; margin-bottom: 20px; }
.tool-card h3 { margin: 0 0 5px; font-size: 1.22rem; letter-spacing: -.02em; }
.tool-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.status { flex: none; padding: 5px 10px; border-radius: 999px; background: var(--pink-pale); color: #a95167; font-size: .72rem; font-weight: 800; letter-spacing: .04em; }
.preview { height: 208px; display: grid; place-items: center; overflow: hidden; border: 1px solid #eee7e9; border-radius: 16px; background: #fbfafb; }
.preview svg { width: 100%; height: 100%; }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 92px; padding-block: 100px; }
.howto p, .about p { color: var(--navy-soft); }
.steps { display: grid; gap: 13px; margin-top: 25px; }
.step { display: flex; align-items: center; gap: 14px; padding: 15px 17px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.step b { display: grid; place-items: center; width: 29px; height: 29px; flex: none; border-radius: 50%; background: var(--navy); color: #fff; font-size: .78rem; }
.about-note { margin-top: 25px; padding-left: 17px; border-left: 3px solid var(--pink); }

.site-footer { padding: 34px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { text-underline-offset: 4px; }

.simple-main { min-height: calc(100vh - 150px); padding: 76px 0 100px; }
.prose { max-width: 740px; }
.prose h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
.prose h2 { margin-top: 44px; font-size: 1.25rem; }
.prose p, .prose li { color: var(--navy-soft); }
.back-link { display: inline-block; margin-top: 42px; color: #a95167; font-weight: 700; text-underline-offset: 4px; }
.error-code { color: var(--pink); font-size: .86rem; font-weight: 800; letter-spacing: .16em; }

@media (max-width: 760px) {
  .shell { width: min(100% - 32px, 620px); }
  .nav { min-height: 66px; }
  .brand { font-size: .9rem; }
  .nav-links { gap: 15px; font-size: .78rem; }
  .nav-links .external { display: none; }
  .hero { padding: 52px 0 48px; }
  .hero-grid { grid-template-columns: 1fr; gap: 20px; }
  .panda-wrap { min-height: 150px; }
  .panda-blob { width: 150px; height: 150px; }
  .panda { width: 125px; }
  .tool-grid, .info-grid { grid-template-columns: 1fr; }
  .tools-section { padding: 62px 0 72px; }
  .section-heading { align-items: start; flex-direction: column; gap: 8px; }
  .tool-card { padding: 19px; border-radius: 20px; }
  .preview { height: 190px; }
  .info-grid { gap: 58px; padding-block: 72px; }
  .footer-inner { align-items: start; flex-direction: column; gap: 12px; }
}

@media (max-width: 360px) {
  .shell { width: calc(100% - 24px); }
  .nav { gap: 10px; }
  .brand { gap: 7px; font-size: .78rem; }
  .brand-mark { width: 30px; height: 30px; }
  .nav-links { font-size: .72rem; }
  .card-top { gap: 10px; }
  .status { padding-inline: 8px; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }