/* =====================================================================
   PLANE9 — 共通ヘッダー / モバイルメニュー / フッター / 星空演出
   投入先: wp-content/themes/swell_child/assets/css/site-chrome.css
   元の静的HTML（plane9.net）の該当CSSをそのまま移植。
   ページ本文（セクション・カード・ボタン等）のCSSはSWELLブロック側で
   別途スタイル付けするため、ここには含めません。
   ===================================================================== */

/* ---------- ベースリセット（ヘッダー/フッターの土台） ---------- */
#body_wrap, #body_wrap *{box-sizing:border-box}
html{scroll-behavior:smooth}
#stars{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:24px}

/* ============ HEADER ============ */
.site-head{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 24px;
  background:rgba(11,11,15,.94);backdrop-filter:blur(16px) saturate(120%);-webkit-backdrop-filter:blur(16px) saturate(120%);
  border-bottom:1px solid rgba(255,255,255,.08);transition:padding .3s var(--ease),background .3s var(--ease)}
.site-head.shrink{padding:9px 24px;background:rgba(11,11,15,.85)}
.head-fx{position:absolute;inset:0;z-index:1;pointer-events:none;opacity:.9}
.site-head>.brand,.site-head>.nav,.site-head>.head-cta,.site-head>.burger{position:relative;z-index:2}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-logo{height:38px;width:auto;max-width:190px;object-fit:contain;display:block;filter:drop-shadow(0 2px 8px rgba(0,0,0,.45));transition:height .3s var(--ease)}
.site-head.shrink .brand-logo{height:31px}
.brand .mark{width:34px;height:34px;border-radius:50%;flex-shrink:0;background:radial-gradient(circle at 34% 30%,var(--glow),var(--wood) 62%,var(--wood-deep));box-shadow:0 0 0 1px rgba(255,255,255,.12),0 0 18px rgba(243,217,166,.35)}
.brand .name{display:flex;flex-direction:column;line-height:1}
.brand .name b{font-family:var(--font-disp);font-weight:700;font-size:20px;letter-spacing:.06em}
.brand .name span{font-size:9.5px;letter-spacing:.34em;color:var(--dust);margin-top:3px}
.nav{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav>li{position:relative}
.nav>li>a{display:block;padding:10px 12px;font-size:13.5px;font-weight:500;color:var(--star);position:relative;border-radius:9px;transition:color .25s,background .25s}
.nav>li>a .en{display:block;font-family:var(--font-disp);font-size:8px;letter-spacing:.22em;color:var(--dust-dim);text-align:center;margin-top:2px;transition:color .25s}
.nav>li>a::after{content:"";position:absolute;left:12px;right:12px;bottom:5px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--glow),var(--wood));transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.nav>li>a:hover,.nav>li>a.active,.nav>li>a.current-menu-item{color:#fff;background:var(--glass-cool-bg)}
.nav>li>a:hover .en,.nav>li>a.active .en{color:var(--glow)}
.nav>li>a:hover::after,.nav>li>a.active::after{transform:scaleX(1)}
.nav>li>a .fall{position:absolute;left:50%;bottom:1px;width:2px;height:13px;border-radius:2px;display:none;pointer-events:none;transform:translate(-50%,-6px) rotate(20deg);background:linear-gradient(180deg,transparent,rgba(255,255,255,.95) 68%,var(--glow));filter:drop-shadow(0 0 4px rgba(243,217,166,.85))}
.nav>li>a:hover .fall{display:block;animation:navfall .72s ease-in .04s}
@keyframes navfall{0%{opacity:0;transform:translate(-50%,-6px) rotate(20deg) scaleY(.5)}22%{opacity:1}100%{opacity:0;transform:translate(calc(-50% + 15px),48px) rotate(20deg) scaleY(1)}}
.has-sub>a{padding-right:18px}
.has-sub>a .en{margin-right:-6px}
.has-sub>a::before{content:"▾";position:absolute;right:4px;top:calc(50% - 8px);font-size:9px;color:var(--dust)}
.sub{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(8px);min-width:230px;padding:8px;list-style:none;background:rgba(16,16,24,.92);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid var(--glass-warm-brd);border-radius:14px;box-shadow:0 20px 50px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.06);opacity:0;visibility:hidden;transition:.28s var(--ease)}
.sub::before{content:"";position:absolute;top:-6px;left:50%;transform:translateX(-50%) rotate(45deg);width:12px;height:12px;background:rgba(16,16,24,.92);border-left:1px solid var(--glass-warm-brd);border-top:1px solid var(--glass-warm-brd)}
.has-sub:hover .sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.sub li{list-style:none}
.sub a{display:flex;align-items:center;gap:9px;padding:9px 12px;font-size:13px;border-radius:9px;color:var(--dust);transition:.2s}
.sub a::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--wood);opacity:.5;flex-shrink:0;transition:.2s}
.sub a:hover{background:var(--glass-warm-bg);color:#fff}
.sub a:hover::before{opacity:1;background:var(--glow);box-shadow:0 0 8px var(--glow)}
.head-cta{flex-shrink:0;padding:10px 18px;border-radius:999px;font-size:13px;font-weight:700;color:var(--ink);background:linear-gradient(135deg,var(--glow),var(--wood));box-shadow:0 4px 16px rgba(181,141,90,.4);transition:transform .25s,box-shadow .25s}
.head-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(243,217,166,.5)}
.burger{display:none;width:44px;height:44px;border:1px solid rgba(255,255,255,.18);border-radius:12px;background:var(--glass-cool-bg);flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer}
.burger span{width:20px;height:2px;background:var(--star);border-radius:2px;transition:.3s var(--ease)}

/* ============ MOBILE MENU ============ */
.m-menu{position:fixed;inset:0;z-index:99;padding:88px 22px 40px;overflow-y:auto;
  background:
    linear-gradient(165deg,rgba(243,217,166,.10),transparent 42%),
    radial-gradient(900px 480px at 85% -8%,rgba(243,217,166,.16),transparent 60%),
    radial-gradient(720px 520px at 6% 108%,rgba(120,150,220,.20),transparent 60%),
    rgba(9,10,17,.46);
  backdrop-filter:blur(36px) saturate(160%);-webkit-backdrop-filter:blur(36px) saturate(160%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.08);
  transform:translateY(-100%);opacity:0;visibility:hidden;transition:.45s var(--ease)}
.m-menu.open{transform:translateY(0);opacity:1;visibility:visible}
.m-menu .lead{font-family:var(--font-disp);font-size:11px;letter-spacing:.3em;color:var(--glow);text-align:center;margin-bottom:18px}
.shooting-star{position:absolute;top:7%;left:0;width:132px;height:2px;border-radius:2px;opacity:0;pointer-events:none;z-index:2;transform:translate(-170px,0) rotate(20deg);background:linear-gradient(90deg,transparent,rgba(255,255,255,.95) 78%,var(--glow));filter:drop-shadow(0 0 6px rgba(243,217,166,.9))}
.shooting-star.play{animation:shoot 1.15s cubic-bezier(.35,.6,.2,1) .3s 1}
@keyframes shoot{0%{opacity:0;transform:translate(-170px,0) rotate(20deg) scaleX(.5)}12%{opacity:1}74%{opacity:1}100%{opacity:0;transform:translate(112vw,54vh) rotate(20deg) scaleX(1)}}
.m-list{list-style:none;margin:0;padding:0}
.m-list>li{border-bottom:1px solid rgba(255,255,255,.12);list-style:none}
.m-list>li>a,.m-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;padding:15px 8px;font-size:16px;font-weight:500;color:var(--star);background:none;border:none;font-family:var(--font-cos);cursor:pointer;text-align:left;text-shadow:0 2px 10px rgba(0,0,0,.5)}
.m-list>li>a .en,.m-toggle .en{font-family:var(--font-disp);font-size:9px;letter-spacing:.22em;color:var(--dust-dim)}
.m-toggle .en{color:var(--glow);display:inline-flex;align-items:center;gap:9px}
.m-toggle .en::after{content:"▾";display:inline-flex;align-items:center;justify-content:center;width:27px;height:27px;border-radius:50%;font-size:12px;line-height:1;color:var(--ink);background:linear-gradient(135deg,var(--glow),var(--wood));box-shadow:0 2px 10px rgba(243,217,166,.5),inset 0 1px 0 rgba(255,255,255,.4);transition:transform .35s var(--ease)}
.m-list>li:has(.m-sub.open)>.m-toggle{color:#fff}
.m-list>li:has(.m-sub.open)>.m-toggle .en::after{transform:rotate(180deg)}
.m-sub{list-style:none;max-height:0;overflow:hidden;opacity:0;margin:0;padding:0;transition:max-height .4s var(--ease),opacity .3s ease,margin .3s ease;
  border-radius:14px;border:1px solid var(--glass-warm-brd);
  background:linear-gradient(160deg,rgba(243,217,166,.14),rgba(255,255,255,.05));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.1)}
.m-sub.open{max-height:480px;opacity:1;margin:2px 0 12px}
.m-sub a{display:flex;align-items:center;gap:11px;padding:14px 16px;font-size:14.5px;font-weight:500;color:var(--star);border-top:1px solid rgba(255,255,255,.1);text-shadow:0 1px 6px rgba(0,0,0,.4)}
.m-sub a:first-child{border-top:0}
.m-sub a::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--glow);box-shadow:0 0 8px var(--glow);flex-shrink:0}
.m-sub a:hover,.m-sub a:active{background:rgba(243,217,166,.16);color:#fff}
.m-menu .m-cta{display:block;text-align:center;margin-top:24px;padding:16px;border-radius:16px;font-weight:700;color:var(--ink);background:linear-gradient(135deg,var(--glow),var(--wood))}

/* ============ SCROLL PROGRESS BAR ============ */
.scroll-progress{position:fixed;top:0;left:0;width:100%;height:3px;z-index:101;transform-origin:0 50%;transform:scaleX(0);background:linear-gradient(90deg,var(--glow),var(--wood));pointer-events:none}

/* ============ FOOTER ============ */
.foot{position:relative;z-index:1;padding:70px 0 40px;border-top:1px solid rgba(255,255,255,.08);background:var(--void);color:var(--star)}
.foot::before{content:"";position:absolute;left:0;right:0;top:-120px;height:120px;pointer-events:none;background:linear-gradient(180deg,transparent,var(--void))}
.foot-top{display:flex;flex-wrap:wrap;gap:40px;justify-content:space-between;margin-bottom:44px}
.foot-brand{max-width:300px}
.foot-brand .name b{font-family:var(--font-disp);font-size:26px;letter-spacing:.05em}
.foot-brand p{color:var(--dust);font-size:13px;margin-top:14px}
.foot-nav{display:grid;grid-template-columns:repeat(3,auto);gap:8px 40px;list-style:none;margin:0;padding:0}
.foot-nav li{list-style:none}
.foot-nav a{font-size:13px;color:var(--dust);padding:5px 0;transition:.2s;display:block}
.foot-nav a:hover{color:var(--glow)}
.foot-sns{display:flex;gap:10px;margin:26px 0 0}
.foot-sns a{width:38px;height:38px;border-radius:10px;background:var(--glass-cool-bg);border:1px solid var(--glass-cool-brd);display:flex;align-items:center;justify-content:center;color:var(--star);font-size:11px;font-family:var(--font-disp);transition:.2s}
.foot-sns a:hover{background:var(--glass-warm-bg);border-color:var(--glass-warm-brd);color:var(--glow)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;padding-top:26px;border-top:1px solid rgba(255,255,255,.06);color:var(--dust-dim);font-size:11px}
.foot-bottom .cats{font-family:var(--font-disp);letter-spacing:.16em}
.btn{padding:15px 30px;border-radius:999px;font-weight:700;font-size:14.5px;transition:transform .25s var(--ease),box-shadow .25s;display:inline-block}
.btn-primary{color:var(--ink);background:linear-gradient(135deg,var(--glow),var(--wood));box-shadow:0 8px 26px rgba(181,141,90,.45)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(243,217,166,.5)}

/* ============ a11y & fallback ============ */
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--glow);outline-offset:3px;border-radius:4px}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
  .site-head{background:rgba(11,11,15,.94)}
  .m-menu{background:rgba(11,11,15,.96)}
  .sub{background:rgba(16,16,24,.98)}
}

/* ============ RESPONSIVE ============ */
@media(max-width:1120px){.nav,.head-cta{display:none}.burger{display:flex}}
@media(max-width:720px){.foot-top{flex-direction:column}.foot-nav{grid-template-columns:repeat(2,auto)}}
@media(max-width:460px){.brand-logo{height:30px;max-width:140px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}


/* ===== PLANE9 追記: フッター星空(cosmos)キャンバス用 ===== */
.foot-fx{position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.85}
.foot{position:relative;overflow:hidden}
.foot>*:not(.foot-fx){position:relative;z-index:1}