:root{--color-brand:#2b3192;--color-nav-text:#1a1a4a;--color-white:#fff;--font-jp:"Noto Sans JP",sans-serif;--header-height:52px;--header-height-sp:50px;--z-header:1000;--z-dropdown:1001;--z-sp-menu:999}.site-header *,.site-header :after,.site-header :before{box-sizing:border-box;margin:0;padding:0}.site-header{background-color:var(--color-white);box-shadow:0 1px 4px rgba(0,0,0,.08);font-family:var(--font-jp);height:var(--header-height);left:0;position:fixed;top:0;width:100%;z-index:var(--z-header)}.header-inner{align-items:center;display:flex;gap:32px;height:100%;margin:0 auto;max-width:1200px;padding:0 24px}.header-logo-ait{height:auto;width:150px}.header-nav{flex:1}.nav-list{align-items:center;display:flex;gap:4px;justify-content:flex-end;list-style:none}.nav-item{position:relative}.nav-link{align-items:center;color:var(--color-nav-text);display:flex;font-size:13.5px;font-weight:500;gap:4px;padding:8px 12px;text-decoration:none;transition:color .2s;white-space:nowrap}.nav-link:hover{color:var(--color-brand)}.nav-arrow{flex-shrink:0;transition:transform .2s}.nav-item--dropdown:focus-within .nav-arrow,.nav-item--dropdown:hover .nav-arrow{transform:rotate(180deg)}.nav-dropdown{background:var(--color-white);border:1px solid rgba(50,91,172,.15);border-radius:6px;box-shadow:0 4px 16px rgba(0,0,0,.1);left:0;min-width:200px;opacity:0;position:absolute;top:calc(100% + 4px);transform:translateY(-6px);transition:opacity .2s,visibility .2s,transform .2s;visibility:hidden;z-index:var(--z-dropdown)}.nav-item--dropdown:focus-within .nav-dropdown,.nav-item--dropdown:hover .nav-dropdown{opacity:1;transform:translateY(0);visibility:visible}.dropdown-list{list-style:none;padding:8px 0}.dropdown-list a{color:var(--color-nav-text);display:block;font-size:13px;padding:10px 20px;text-decoration:none;transition:background .15s,color .15s}.dropdown-list a:hover{background:rgba(50,91,172,.06);color:var(--color-brand)}.header-cta{display:flex;flex-shrink:0;gap:8px}.btn,.header-cta{align-items:center}.btn{border:1.5px solid transparent;border-radius:4px;cursor:pointer;display:inline-flex;font-family:var(--font-jp);font-size:13px;font-weight:600;justify-content:center;padding:3px 15px;text-decoration:none;transition:background .2s,color .2s,border-color .2s,opacity .2s;white-space:nowrap}.btn--full{width:100%}.header-btn{align-items:center;border:1.5px solid transparent;border-radius:4px;cursor:pointer;display:inline-flex;font-family:var(--font-jp);font-size:13px;font-weight:600;justify-content:center;padding:3px 15px;text-decoration:none;white-space:nowrap}.header-btn--primary{background:var(--color-brand);border-color:var(--color-brand);color:var(--color-white)}.btn--outline{background:transparent;border-color:var(--color-brand);color:var(--color-brand)}.btn--outline:hover{background:rgba(50,91,172,.06)}.btn--primary{background:var(--color-brand);border-color:var(--color-brand);color:var(--color-white)}.btn--primary:hover{opacity:.85}.hamburger{background:none;border:none;cursor:pointer;display:none;flex-direction:column;flex-shrink:0;gap:5px;height:40px;justify-content:center;margin-left:auto;padding:6px;width:40px}.hamburger-bar{background:var(--color-nav-text);border-radius:2px;display:block;height:2px;transform-origin:center;transition:transform .3s,opacity .3s;width:100%}.hamburger[aria-expanded=true] .hamburger-bar:first-child{transform:translateY(7px) rotate(45deg)}.hamburger[aria-expanded=true] .hamburger-bar:nth-child(2){opacity:0}.hamburger[aria-expanded=true] .hamburger-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}.sp-menu{background:var(--color-white);display:none;height:calc(100vh - var(--header-height-sp));left:0;opacity:0;overflow-y:auto;pointer-events:none;position:fixed;top:var(--header-height-sp);transform:translateY(-8px);transition:opacity .25s,transform .25s;width:100%;z-index:var(--z-sp-menu)}.sp-menu.is-open{opacity:1;pointer-events:auto;transform:translateY(0)}.sp-nav-list{list-style:none;padding:8px 0}.sp-nav-item{border-bottom:1px solid rgba(0,0,0,.06)}.sp-nav-btn,.sp-nav-link{align-items:center;background:none;border:none;color:var(--color-nav-text);cursor:pointer;display:flex;font-family:var(--font-jp);font-size:14px;font-weight:500;justify-content:space-between;padding:16px 24px;text-align:left;text-decoration:none;width:100%}.sp-nav-btn[aria-expanded=true] .nav-arrow{transform:rotate(180deg)}.sp-dropdown{background:rgba(50,91,172,.04);display:none;list-style:none;padding:4px 0}.sp-dropdown.is-open{display:block}.sp-dropdown a{color:var(--color-nav-text);display:block;font-size:13px;padding:12px 40px;text-decoration:none}.sp-cta{display:flex;flex-direction:column;gap:10px;padding:20px 24px}@media (max-width:960px){.header-cta,.header-nav{display:none}.hamburger{display:flex}.sp-menu{display:block}.site-header{height:var(--header-height-sp)}}