* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--canvas);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { color: inherit; }
::selection { background: var(--butter); color: var(--ink); }

.skip-link { position: fixed; left: 12px; top: -80px; z-index: 999; padding: 10px 14px; background: var(--ink); color: var(--white); }
.skip-link:focus { top: 12px; }
.shell { width: min(100%, var(--page)); margin: 0 auto; padding: 0 28px; }
.page-main { min-height: calc(100vh - var(--header-h)); }
.section { padding: 48px 0 68px; }
.section-sm { padding: 28px 0 44px; }
.eyebrow { margin: 0 0 9px; color: var(--pink-deep); font-size: 12px; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.display { margin: 0; font-family: var(--font-display); font-size: clamp(38px, 5vw, 74px); line-height: 1.02; letter-spacing: -.055em; }
.page-title { margin: 0; font-size: clamp(30px, 4vw, 52px); line-height: 1.08; letter-spacing: -.045em; }
.section-title { margin: 0; font-size: clamp(23px, 2.2vw, 32px); line-height: 1.2; letter-spacing: -.035em; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 22px; }
.section-head p { margin: 7px 0 0; color: var(--ink-soft); }
.text-muted { color: var(--ink-soft); }
.text-small { font-size: 13px; }
.link-arrow { display: inline-flex; align-items: center; gap: 7px; font-weight: 750; border-bottom: 1px solid var(--ink); }
.link-arrow::after { content: "↗"; }
.stack { display: grid; gap: 14px; }
.cluster { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }

:focus-visible { outline: 3px solid rgba(232,111,140,.36); outline-offset: 3px; }

.site-header {
  position: sticky; top: 0; z-index: 50; height: var(--header-h);
  border-bottom: 1px solid var(--line); background: rgba(255,253,249,.94); backdrop-filter: blur(16px);
}
.header-inner { height: 100%; display: grid; grid-template-columns: 250px 1fr 250px; align-items: center; gap: 20px; }
.brand { display: inline-flex; align-items: center; width: max-content; gap: 10px; font-family: var(--font-display); font-size: 23px; letter-spacing: -.04em; }
.brand-mark { position: relative; width: 30px; height: 30px; border: 2px solid var(--ink); border-radius: 50% 48% 44% 52%; background: var(--pink); transform: rotate(-6deg); }
.brand-mark::before, .brand-mark::after { content: ""; position: absolute; top: 5px; width: 7px; height: 7px; border: 2px solid var(--ink); border-bottom: 0; border-radius: 8px 8px 0 0; background: var(--pink); }
.brand-mark::before { left: -3px; transform: rotate(-35deg); }
.brand-mark::after { right: -3px; transform: rotate(35deg); }
.brand small { padding: 2px 6px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--ink-soft); font-family: var(--font-sans); font-size: 9px; font-weight: 800; letter-spacing: .08em; }
.main-nav { display: flex; justify-content: center; gap: 30px; }
.main-nav a { position: relative; padding: 23px 0 20px; color: var(--ink-soft); font-size: 14px; font-weight: 700; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--ink); }
.main-nav a[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: 13px; height: 3px; border-radius: 2px; background: var(--pink); }
.header-actions { display: flex; justify-content: flex-end; align-items: center; gap: 8px; }
.icon-button { display: inline-grid; place-items: center; width: 40px; height: 40px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); cursor: pointer; transition: var(--ease); }
.icon-button:hover { border-color: var(--ink); transform: translateY(-1px); }
.mobile-menu-button { display: none; }
.mobile-panel { display: none; }
.app-bottom-nav { display: none; }

.notice-strip { border-bottom: 1px solid var(--line); background: var(--butter); }
.notice-inner { min-height: 38px; display: flex; align-items: center; justify-content: center; gap: 10px; font-size: 12px; font-weight: 700; }
.notice-inner span:first-child { padding: 1px 6px; border: 1px solid var(--ink); border-radius: 3px; font-size: 10px; }

.site-footer { border-top: 1px solid var(--line); background: var(--paper); }
.footer-inner { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; padding-top: 34px; padding-bottom: 40px; color: var(--ink-soft); font-size: 12px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; font-weight: 700; color: var(--ink); }

@media (max-width: 980px) {
  .shell { padding-inline: 20px; }
  .header-inner { grid-template-columns: 1fr auto; }
  .main-nav { display: none; }
  .mobile-menu-button { display: inline-grid; }
  .header-actions .desktop-only { display: none; }
  .mobile-panel { position: fixed; inset: var(--header-h) 0 auto; z-index: 45; display: grid; gap: 6px; padding: 18px 20px 24px; border-bottom: 1px solid var(--line); background: var(--paper); box-shadow: 0 18px 30px rgba(39,33,31,.08); transform: translateY(-130%); transition: transform var(--ease); }
  .mobile-panel.is-open { transform: translateY(0); }
  .mobile-panel a { padding: 12px 4px; border-bottom: 1px solid var(--line); font-weight: 750; }
}

@media (max-width: 620px) {
  body { font-size: 14px; }
  body[data-page] { padding-bottom: calc(70px + env(safe-area-inset-bottom)); }
  .header-inner { grid-template-columns: 1fr; }
  .header-actions, .mobile-menu-button, .mobile-panel { display: none; }
  .shell { padding-inline: 16px; }
  .section { padding: 36px 0 52px; }
  .section-head { align-items: start; }
  .section-head .link-arrow { display: none; }
  .footer-inner { grid-template-columns: 1fr; gap: 20px; }
  .notice-inner { justify-content: flex-start; overflow: hidden; white-space: nowrap; }
  .app-bottom-nav { position: fixed; z-index: 65; left: 0; right: 0; bottom: 0; height: calc(64px + env(safe-area-inset-bottom)); display: grid; grid-template-columns: repeat(5, 1fr); padding: 3px 6px env(safe-area-inset-bottom); border-top: 1px solid var(--line); background: rgba(255,253,249,.97); backdrop-filter: blur(18px); }
  .app-bottom-nav a { position: relative; display: grid; place-items: center; align-content: center; gap: 1px; min-width: 0; color: var(--ink-soft); font-size: 9px; font-weight: 650; }
  .app-bottom-nav i { display: grid; place-items: center; width: 30px; height: 30px; font-size: 19px; font-style: normal; line-height: 1; }
  .app-bottom-nav a:nth-child(3) i { border: 1px solid var(--ink); border-radius: 50%; background: var(--pink); color: var(--ink); }
  .app-bottom-nav a[aria-current="page"] { color: var(--pink-deep); font-weight: 850; }
  .app-bottom-nav a[aria-current="page"]::after { content: ""; position: absolute; top: 0; width: 18px; height: 2px; border-radius: 2px; background: var(--pink-deep); }
}