/* ============================================================
   FlexGear HP — shared.css
   全ページ共通スタイル（Design System A: Outfit + Zen Kaku Gothic New）

   注意: ghost-scan-lp.html は独自デザインシステム（Inter + IBM Plex Mono）
   のため、このファイルを読み込まない。別途 ghost-scan.css を検討。
   ============================================================ */

/* --- RESET --- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

/* --- DESIGN TOKENS --- */
:root{
  --primary:#0F172A;
  --primary-container:#1E293B;
  --secondary:#14B8A6;
  --on-secondary:#042F2E;
  --tertiary:#0891B2;
  --surface:#FFFFFF;
  --surface-dim:#F1F5F9;
  --surface-hi:#F0FDFA;
  --on-surface:#0F172A;
  --on-surface-var:#475569;
  --outline:#CBD5E1;
  --outline-var:#E2E8F0;
  --ff-ja:'Noto Sans JP',sans-serif;
  --ff-display:'Zen Kaku Gothic New','Noto Sans JP',sans-serif;
  --ff-en:'Outfit',sans-serif;
}

/* --- BASE --- */
html{scroll-behavior:smooth;overflow-x:hidden}
body{font-family:var(--ff-ja);color:var(--on-surface);background:var(--surface);overflow-x:hidden}

/* --- GRAIN OVERLAY --- */
body::after{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:9999;opacity:.025;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat:repeat;background-size:180px}

/* --- SKIP LINK (a11y) --- */
.skip-link{
  position:absolute;top:-100%;left:16px;z-index:200;
  background:var(--primary);color:var(--secondary);
  padding:12px 24px;border-radius:0 0 8px 8px;
  font-family:var(--ff-en);font-weight:700;font-size:14px;
  text-decoration:none;transition:top .2s}
.skip-link:focus{top:0}

/* --- FOCUS INDICATORS (a11y) --- */
:focus-visible{
  outline:2px solid var(--secondary);
  outline-offset:2px}

/* --- NAVIGATION ---
   デフォルト: サブページ用（scrolled状態が初期値）
   トップページ: .nav--hero 修飾子で透明初期状態 + scroll JSで .scrolled 付与
   ------------------------------------------------------------ */
.nav{position:fixed;top:0;left:0;width:100%;z-index:100;
  padding:0 48px;height:72px;display:flex;align-items:center;justify-content:space-between;
  background:rgba(255,255,255,.94);backdrop-filter:blur(12px);
  box-shadow:0 1px 3px rgba(0,0,0,.04);transition:all .4s}

.nav--hero{background:transparent;backdrop-filter:none;box-shadow:none}
.nav--hero.scrolled{background:rgba(255,255,255,.94);backdrop-filter:blur(12px);box-shadow:0 1px 3px rgba(0,0,0,.04)}

.nav-logo{font-family:var(--ff-en);font-weight:800;font-size:16px;
  letter-spacing:.25em;text-transform:uppercase;color:var(--primary);text-decoration:none}
.nav-logo span{color:var(--secondary)}

.nav-links{display:flex;gap:32px;align-items:center}
.nav-links a{font-family:var(--ff-en);font-size:14px;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;color:var(--on-surface-var);
  text-decoration:none;transition:color .2s}
.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a.active{color:var(--secondary)}

.nav-cta{display:inline-block;background:var(--primary);color:var(--secondary);
  font-family:var(--ff-en);font-weight:700;font-size:14px;
  letter-spacing:.08em;padding:12px 28px;border-radius:8px;
  text-decoration:none;transition:all .25s}
.nav-cta:hover,
.nav-cta:focus-visible{background:var(--primary-container)}

/* Hamburger — <button> (a11y: keyboard accessible) */
.nav-hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;
  padding:8px;z-index:101;
  background:none;border:none;-webkit-appearance:none;appearance:none}
.nav-hamburger span{display:block;width:22px;height:2px;background:var(--primary);
  transition:all .3s;pointer-events:none}
.nav-hamburger[aria-expanded="true"] span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.nav-hamburger[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-hamburger[aria-expanded="true"] span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* Mobile menu */
.nav-mobile{display:none;position:fixed;inset:0;
  background:rgba(255,255,255,.98);backdrop-filter:blur(20px);z-index:99;
  flex-direction:column;align-items:center;justify-content:center;gap:32px}
.nav-mobile[aria-hidden="false"]{display:flex}
.nav-mobile a{font-family:var(--ff-en);font-size:16px;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;color:var(--on-surface);
  text-decoration:none;transition:color .2s}
.nav-mobile a:hover,
.nav-mobile a:focus-visible,
.nav-mobile a.active{color:var(--secondary)}

/* --- REVEAL ANIMATIONS --- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-left{opacity:0;transform:translateX(-40px);transition:opacity .8s ease,transform .8s ease}
.reveal-left.visible{opacity:1;transform:translateX(0)}
.reveal-scale{opacity:0;transform:scale(.92);transition:opacity .8s ease,transform .8s ease}
.reveal-scale.visible{opacity:1;transform:scale(1)}
.stagger>.reveal:nth-child(1){transition-delay:0s}
.stagger>.reveal:nth-child(2){transition-delay:.12s}
.stagger>.reveal:nth-child(3){transition-delay:.24s}
.stagger>.reveal:nth-child(4){transition-delay:.36s}

/* --- SHARED BUTTONS --- */
.btn-primary{display:inline-block;background:var(--secondary);color:#fff;
  font-family:var(--ff-en);font-weight:700;
  font-size:14px;letter-spacing:.08em;padding:18px 44px;border-radius:8px;
  text-decoration:none;transition:background .25s}
.btn-primary:hover,
.btn-primary:focus-visible{background:#2DD4BF}

/* --- BREADCRUMB --- */
.breadcrumb{max-width:1600px;margin:0 auto;padding:0 80px 48px;
  display:flex;align-items:center;gap:8px;font-size:12px}
.breadcrumb a{color:var(--on-surface-var);text-decoration:none;
  font-family:var(--ff-en);font-weight:500;letter-spacing:.04em;transition:color .2s}
.breadcrumb a:hover,
.breadcrumb a:focus-visible{color:var(--secondary)}
.breadcrumb span{color:var(--outline)}

/* --- SECTION TAG (common heading pattern) --- */
.section-tag{font-family:var(--ff-en);font-weight:700;font-size:12px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--secondary);
  display:flex;align-items:center;gap:14px;margin-bottom:24px}
.section-tag::before{content:'';width:32px;height:2px;background:var(--secondary)}

/* --- FOOTER --- */
.footer{background:var(--primary);color:rgba(255,255,255,.6);position:relative;overflow:hidden}
.footer-top{max-width:1600px;margin:0 auto;display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;padding:56px 80px}
.footer-brand{}
.footer-logo{font-family:var(--ff-en);font-weight:800;font-size:20px;
  letter-spacing:.25em;text-transform:uppercase;color:#fff;margin-bottom:12px}
.footer-logo span{color:var(--secondary)}
.footer-meta{font-family:var(--ff-en);font-size:12px;letter-spacing:.14em;
  color:rgba(255,255,255,.35);text-transform:uppercase;margin-bottom:16px}
.footer-tagline{font-family:var(--ff-display);font-weight:900;font-size:18px;
  color:rgba(255,255,255,.12);letter-spacing:.08em;margin-top:20px}
.footer-col-title{font-family:var(--ff-en);font-weight:700;font-size:12px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--secondary);margin-bottom:20px}
.footer-col-links{display:flex;flex-direction:column;gap:14px}
.footer-col-links a{font-size:14px;color:rgba(255,255,255,.45);
  text-decoration:none;transition:color .2s;letter-spacing:.02em}
.footer-col-links a:hover,
.footer-col-links a:focus-visible{color:var(--secondary)}
.footer-bottom{max-width:1600px;margin:0 auto;padding:24px 80px 32px;
  border-top:1px solid rgba(255,255,255,.06);
  display:flex;justify-content:space-between;align-items:center}
.footer-copy{font-family:var(--ff-en);font-size:12px;letter-spacing:.1em;color:rgba(255,255,255,.25)}
.footer-social{display:flex;gap:20px}
.footer-social a{color:rgba(255,255,255,.35);text-decoration:none;
  font-family:var(--ff-en);font-size:12px;letter-spacing:.1em;
  text-transform:uppercase;transition:color .2s}
.footer-social a:hover,
.footer-social a:focus-visible{color:var(--secondary)}

/* --- RESPONSIVE (shared breakpoints) --- */
@media(max-width:880px){
  .nav{padding:0 24px}
  .nav-links{display:none}
  .nav-hamburger{display:flex}
  .breadcrumb{padding:0 24px 32px}
  .footer-top{grid-template-columns:1fr;gap:32px;padding:40px 24px}
  .footer-bottom{flex-direction:column;gap:16px;align-items:flex-start;padding:20px 24px 24px}
}

@media(prefers-reduced-motion:reduce){
  .reveal,.reveal-left,.reveal-scale{opacity:1;transform:none;transition:none}
}