:root { color-scheme: dark; --ink: #f5f2e9; --muted: #bdc1b9; --line: rgba(245,242,233,.36); --gold: #d8bd72; --panel-width: 25vw; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; min-height: 100%; background: #090d0c; color: var(--ink); font-family: Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif; }
body { overflow: hidden; }
html.intro-pending .portal-header, html.intro-pending .portal-main, html.intro-pending .mobile-menu { visibility: hidden; }
a { color: inherit; text-decoration: none; }
.portal-header { position: fixed; z-index: 5; inset: 0 0 auto; height: 78px; display: flex; align-items: center; justify-content: space-between; padding: 0 38px; background: rgba(7,11,10,.58); border-bottom: 1px solid rgba(255,255,255,.12); backdrop-filter: blur(12px); }
.portal-brand { display: inline-flex; align-items: center; flex: none; gap: 10px; height: 62px; padding: 6px 15px 6px 7px; background: #070908; border: 1px solid rgba(214,173,99,.62); box-shadow: 0 8px 24px rgba(0,0,0,.22); }
.brand-mark { display: block; width: 49px; height: 49px; object-fit: contain; }
.brand-wordmark { display: block; width: 168px; height: auto; }
.portal-brand:focus-visible, .portal-intro button:focus-visible, .intro-replay:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }
.portal-tools { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 11px; letter-spacing: .18em; }
.intro-replay { display: grid; place-items: center; width: 38px; height: 38px; padding: 0; border: 1px solid var(--line); background: rgba(8,13,12,.55); color: var(--ink); font-size: 24px; line-height: 1; cursor: pointer; }
.intro-replay:hover { color: var(--gold); border-color: var(--gold); }
.menu-button { display: none; width: 40px; height: 40px; border: 1px solid var(--line); background: transparent; }
.menu-button span { display: block; width: 15px; height: 1px; margin: 5px auto; background: var(--ink); }
.portal-intro { position: fixed; z-index: 10; inset: 0; overflow: hidden; background: #040505; opacity: 1; transition: opacity .45s ease; }
.portal-intro.is-leaving { opacity: 0; pointer-events: none; }
.intro-video { display: block; width: 100%; height: 100%; object-fit: contain; background: #040505; }
.intro-topbar, .intro-footer { position: absolute; right: 38px; left: 38px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.intro-topbar { top: max(22px, env(safe-area-inset-top)); }
.intro-footer { bottom: max(26px, env(safe-area-inset-bottom)); }
.intro-sound, .intro-skip, .intro-play { min-height: 44px; border: 1px solid rgba(255,255,255,.62); background: rgba(4,5,5,.86); color: #fff; font: inherit; font-size: 12px; cursor: pointer; }
.intro-sound { min-width: 102px; padding: 0 12px; }
.intro-skip { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-width: 126px; padding: 0 16px; }
.intro-skip span { font-size: 18px; line-height: 1; }
.intro-sound:hover, .intro-skip:hover, .intro-play:hover { border-color: var(--gold); color: var(--gold); }
.intro-label { color: #f5f2e9; font-size: 11px; text-shadow: 0 2px 8px #000; }
.intro-play { position: absolute; top: 50%; left: 50%; min-width: 160px; padding: 0 22px; transform: translate(-50%,-50%); }
.intro-progress { position: absolute; right: 0; bottom: 0; left: 0; width: 100%; height: 3px; border: 0; appearance: none; background: rgba(255,255,255,.25); }
.intro-progress::-webkit-progress-bar { background: rgba(255,255,255,.25); }
.intro-progress::-webkit-progress-value { background: #bc7446; }
.intro-progress::-moz-progress-bar { background: #bc7446; }
.portal-main { position: relative; min-height: 100svh; height: 100svh; }
.portal-grid { display: flex; width: 100%; height: 100%; }
.portal-panel { position: relative; display: block; width: var(--panel-width); min-width: 0; overflow: hidden; border-right: 1px solid rgba(255,255,255,.26); transition: width .55s cubic-bezier(.2,.72,.2,1), filter .55s ease; }
.portal-panel:hover, .portal-panel:focus-visible, .portal-panel.is-active { width: 34vw; }
.portal-panel:not(:hover):not(:focus-visible):not(.is-active) { filter: saturate(.75) brightness(.78); }
.panel-art, .panel-tint { position: absolute; inset: 0; }
.panel-art { background-position: center; background-size: cover; transform: scale(1.04); transition: transform .7s ease; }
.portal-panel:hover .panel-art, .portal-panel:focus-visible .panel-art, .portal-panel.is-active .panel-art { transform: scale(1.1); }
.art-community { background-image: url("../public/assets/portal-community-ai.webp"); }
.art-game { background-image: url("../public/assets/portal-game-ai.webp"); }
.art-company { background-image: url("../public/assets/portal-company-ai.webp"); }
.art-support { background-image: url("../public/assets/portal-support-ai.webp"); }
.panel-tint { background: rgba(5,10,9,.42); transition: background .5s ease; }
.portal-panel:hover .panel-tint, .portal-panel:focus-visible .panel-tint, .portal-panel.is-active .panel-tint { background: rgba(5,10,9,.2); }
.panel-content { position: absolute; inset: auto 30px 46px; z-index: 1; text-shadow: 0 2px 14px rgba(0,0,0,.55); }
.panel-index { display: block; margin-bottom: 12px; color: var(--gold); font: 12px Georgia, serif; letter-spacing: .2em; }
.panel-kicker { margin: 0 0 8px; color: #e9dfbd; font-size: 10px; letter-spacing: .24em; }
.panel-content h1 { margin: 0; font-size: clamp(20px, 2.2vw, 34px); font-weight: 400; letter-spacing: .12em; white-space: nowrap; }
.panel-status { display: inline-block; margin-top: 15px; padding-top: 10px; border-top: 1px solid var(--line); color: var(--muted); font-size: 10px; letter-spacing: .16em; }
.panel-arrow { position: absolute; z-index: 1; right: 24px; bottom: 44px; color: var(--gold); font-size: 24px; opacity: .9; transition: transform .3s ease; }
.portal-panel:hover .panel-arrow, .portal-panel:focus-visible .panel-arrow { transform: translate(4px,-4px); }
.grid-control { position: absolute; z-index: 3; top: 50%; width: 44px; height: 74px; border: 0; color: var(--ink); background: rgba(5,10,9,.45); font-size: 45px; line-height: 1; transform: translateY(-50%); cursor: pointer; }
.grid-control:hover { background: rgba(5,10,9,.75); color: var(--gold); }
.grid-prev { left: 0; } .grid-next { right: 0; }
.portal-caption { position: absolute; z-index: 3; right: 36px; bottom: 20px; left: 38px; display: flex; justify-content: space-between; color: rgba(245,242,233,.68); font-size: 9px; letter-spacing: .2em; pointer-events: none; }
.mobile-menu, .portal-toast { display: none; }
@media (max-width: 700px) {
  body { overflow: auto; }
  .portal-header { height: 62px; padding: 0 18px; }
  .portal-brand { height: 50px; gap: 6px; padding: 5px 9px 5px 5px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-wordmark { width: 116px; }
  .portal-tools { gap: 10px; }
  .language-label { display: none; }
  .menu-button { display: block; }
  .intro-replay { width: 36px; height: 36px; }
  .intro-topbar { top: max(14px, env(safe-area-inset-top)); right: 16px; left: 16px; }
  .intro-footer { right: 16px; bottom: max(30px, env(safe-area-inset-bottom)); left: 16px; }
  .intro-sound { min-width: 92px; }
  .intro-label { font-size: 10px; }
  .portal-main { height: auto; min-height: 100svh; }
  .portal-grid { display: grid; grid-template-columns: 1fr 1fr; height: 100svh; min-height: 620px; }
  .portal-panel, .portal-panel:hover, .portal-panel:focus-visible, .portal-panel.is-active { width: auto; min-height: 0; filter: none; }
  .portal-panel:nth-child(1), .portal-panel:nth-child(2) { border-bottom: 1px solid rgba(255,255,255,.26); }
  .portal-panel:nth-child(odd) { border-right: 1px solid rgba(255,255,255,.26); }
  .panel-content { inset: auto 16px 23px; } .panel-arrow { right: 13px; bottom: 21px; font-size: 18px; }
  .panel-content h1 { font-size: clamp(16px, 5vw, 24px); letter-spacing: .08em; }
  .panel-kicker { font-size: 8px; } .panel-index { font-size: 10px; }
  .grid-control { top: auto; bottom: 16px; width: 34px; height: 34px; font-size: 28px; background: rgba(5,10,9,.7); transform: none; }
  .grid-prev { left: 14px; } .grid-next { right: 14px; }
  .portal-caption { display: none; }
  .mobile-menu { position: fixed; z-index: 4; top: 62px; right: 12px; left: 12px; display: grid; gap: 0; padding: 8px 0; background: rgba(8,13,12,.96); border: 1px solid var(--line); opacity: 0; pointer-events: none; transform: translateY(-8px); transition: opacity .2s ease, transform .2s ease; }
  .mobile-menu.is-open { opacity: 1; pointer-events: auto; transform: none; }
  .mobile-menu a { padding: 14px 18px; border-bottom: 1px solid rgba(255,255,255,.12); font-size: 13px; letter-spacing: .12em; }
  .mobile-menu a:last-child { border-bottom: 0; }
  .portal-toast { position: fixed; z-index: 8; right: 20px; bottom: 66px; left: 20px; display: block; padding: 12px 16px; background: rgba(8,13,12,.94); border-left: 2px solid var(--gold); color: var(--ink); font-size: 12px; opacity: 0; transform: translateY(8px); transition: opacity .2s ease, transform .2s ease; pointer-events: none; }
  .portal-toast.is-visible { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .portal-intro, .portal-panel, .panel-art { transition-duration: 0s; }
}