/* Layout: dark product stage. Full-bleed hero with the battery visual on the right,
   then a narrow reading column; the four values sit in one row of blue-labelled banners. */
:root {
  --ink: #04060c;          /* page */
  --panel: #0a0e19;        /* raised surfaces */
  --line: #1b2235;         /* rules and borders */
  --fg: #eef1f7;           /* text */
  --muted: #9aa3b8;        /* secondary text */
  --blue: #2b35ff;         /* brand electric blue (banner labels) */
  --ice: #57b0ff;          /* corrosion / protection */
  --fire: #ff7a2f;         /* heat / safety */
  --pass: #46d39a;
  --f-display: "Poppins", "Segoe UI", system-ui, sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--ink); color: var(--fg); font: 400 17px/1.65 var(--f-body); }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 60; background: var(--ink); }
img { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--ice); outline-offset: 3px; border-radius: 4px; }
sup { font-size: .5em; vertical-align: super; line-height: 0; }
.wrap { width: 100%; max-width: 1160px; margin-inline: auto; padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }
h1, h2, h3 { font-family: var(--f-display); font-weight: 700; line-height: 1.15; text-wrap: balance; margin: 0; letter-spacing: -.01em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.dot { color: var(--blue); }
.tag { display: inline-block; font: 600 .8rem/1 var(--f-display); color: #fff; background: var(--blue); padding: .5em .9em; box-shadow: 0 0 22px rgba(43, 53, 255, .55); }

/* header */
.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50; background: rgba(4, 6, 12, .82); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.top-in { max-width: 1160px; margin-inline: auto; display: flex; align-items: center; gap: 24px; min-height: 64px; padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }
.brand { font: 700 1.05rem/1 var(--f-display); text-decoration: none; letter-spacing: -.02em; white-space: nowrap; margin: 0; }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav a { font: 500 .88rem/1 var(--f-display); color: var(--muted); text-decoration: none; padding-block: 6px; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--fg); border-color: var(--blue); }
.nav-members { display: inline-flex; gap: 6px; align-items: center; color: var(--fg) !important; border: 1px solid var(--line) !important; padding: 7px 12px !important; border-radius: 999px; }
.nav-members svg, .members-card svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.top-tools { display: flex; align-items: center; gap: 8px; }
.lang { position: relative; }
.lang-btn, .menu-btn { font: 600 .82rem/1 var(--f-display); color: var(--fg); background: transparent; border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; cursor: pointer; display: inline-flex; gap: 6px; align-items: center; }
.lang-btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.2; }
.lang-btn:hover, .menu-btn:hover { border-color: var(--muted); }
.lang-menu { position: absolute; right: 0; top: calc(100% + 8px); list-style: none; margin: 0; padding: 6px; min-width: 180px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 18px 40px rgba(0, 0, 0, .5); }
.lang-menu button { width: 100%; display: flex; justify-content: space-between; gap: 12px; align-items: center; font: 500 .9rem/1 var(--f-body); color: var(--fg); background: none; border: 0; padding: 10px 10px; border-radius: 6px; cursor: pointer; text-align: left; }
.lang-menu button[aria-checked="true"] { background: rgba(43, 53, 255, .18); }
.lang-menu button:disabled { color: var(--muted); cursor: default; }
.lang-menu em { font: 500 .7rem/1 var(--f-mono); font-style: normal; color: var(--muted); border: 1px solid var(--line); padding: 3px 6px; border-radius: 4px; }
.menu-btn { display: none; }

/* hero */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero-media { position: absolute; inset: 0 0 0 auto; width: min(70%, 980px); }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: 30% 50%; }
.hero-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--ink) 0%, rgba(4, 6, 12, .85) 22%, rgba(4, 6, 12, 0) 55%), linear-gradient(0deg, var(--ink) 0%, rgba(4, 6, 12, 0) 30%); }
.hero-in { position: relative; padding-block: clamp(64px, 10vw, 128px) clamp(56px, 8vw, 96px); }
.eyebrow { font: 500 .8rem/1.4 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ice); margin: 0 0 22px; }
.hero-title { font-size: clamp(3.6rem, 10vw, 7.5rem); font-weight: 800; line-height: .95; letter-spacing: -.035em; }
.hero-lead { max-width: 34rem; color: #cfd5e3; font-size: 1.12rem; margin: 26px 0 0; }
.hero-stats { list-style: none; padding: 0; margin: 34px 0 0; display: flex; flex-wrap: wrap; gap: 12px; }
.hero-stats li { display: grid; gap: 2px; padding: 12px 16px; border: 1px solid var(--line); background: rgba(10, 14, 25, .72); border-radius: 8px; min-width: 0; }
.hero-stats b { font: 600 1.25rem/1.1 var(--f-mono); color: var(--fire); font-variant-numeric: tabular-nums; }
.hero-stats span { font-size: .8rem; color: var(--muted); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn { font: 600 .92rem/1 var(--f-display); text-decoration: none; padding: 15px 22px; border-radius: 999px; display: inline-flex; }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 0 28px rgba(43, 53, 255, .5); }
.btn-primary:hover { background: #3a43ff; }
.btn-ghost { border: 1px solid #39425a; }
.btn-ghost:hover { border-color: var(--fg); }

/* intro */
.intro { padding-block: clamp(64px, 9vw, 112px) 24px; display: grid; gap: 22px; max-width: 900px; }
.intro-kicker { font: 600 clamp(1.3rem, 2.6vw, 1.75rem)/1.3 var(--f-display); margin: 0; }
.ice { color: var(--ice); } .fire { color: var(--fire); }
.intro-text { color: #c4cbda; margin: 0; max-width: 65ch; }

/* banners */
.values { padding-block: clamp(48px, 7vw, 88px); }
.values-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 32px; margin-bottom: 36px; }
.we-can { font: 700 clamp(2.6rem, 6vw, 4rem)/1 var(--f-display); letter-spacing: -.03em; margin: 0; }
.values-head h2 { font-size: clamp(1.2rem, 2.2vw, 1.6rem); font-weight: 600; color: var(--muted); }
.banners { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.banner { display: grid; grid-template-rows: auto auto auto 1fr auto; text-decoration: none; border: 1px solid #262a63; background: linear-gradient(180deg, #0b0e1c, #06080f); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.banner:hover { transform: translateY(-4px); border-color: var(--blue); box-shadow: 0 16px 40px rgba(43, 53, 255, .25); }
.banner-label { font: 700 1rem/1 var(--f-display); text-align: center; color: #fff; background: var(--blue); padding: 13px 10px; box-shadow: 0 0 26px rgba(43, 53, 255, .6); }
.banner-icon { display: grid; place-items: center; margin: 26px auto 8px; width: 132px; height: 112px; background: #0e1220; border-radius: 10px; }
.banner-icon svg { width: 84px; height: 84px; }
.banner-name { font: 700 1.1rem/1.2 var(--f-display); text-align: center; padding-inline: 12px; }
.banner-line { font-size: .88rem; color: var(--muted); text-align: center; padding: 8px 18px 0; }
.banner-go { font: 600 .82rem/1 var(--f-display); color: var(--ice); padding: 18px; text-align: center; }

/* icon strokes */
svg .i-line { fill: none; stroke: #e9ecf5; stroke-width: 2.4; stroke-linejoin: round; stroke-linecap: round; }
svg .i-faint { fill: none; stroke: #5a6380; stroke-width: 1.6; stroke-linecap: round; }
svg .i-dash { fill: none; stroke: #8f98b3; stroke-width: 1.4; stroke-dasharray: 2 3; }
svg .i-dot { fill: #e9ecf5; }
svg .i-accent { stroke: var(--ice); }
svg .i-leaf { fill: #4fc77a; }
svg .i-fill { stroke: none; }
svg .i-fill-1 { fill: #9aa3b8; } svg .i-fill-2 { fill: #f2f4fa; }
svg .i-txt { fill: #5e8bff; font: 600 8px var(--f-mono); }

/* detail rows */
.detail { padding-block: 8px clamp(56px, 8vw, 96px); display: grid; }
.detail-row { display: grid; grid-template-columns: minmax(0, 280px) minmax(0, 1fr); gap: 20px 56px; padding-block: 40px; border-top: 1px solid var(--line); }
.detail-num { display: grid; gap: 14px; align-content: start; justify-items: start; }
.detail-num h3 { font-size: 1.6rem; }
.detail-body p { margin: 0; color: #c4cbda; max-width: 62ch; }
.more { display: inline-block; margin-top: 16px; font: 600 .92rem/1 var(--f-display); color: var(--ice); text-decoration: none; }
.more:hover { text-decoration: underline; text-underline-offset: 4px; }

/* proof */
.proof { background: var(--panel); border-block: 1px solid var(--line); padding-block: clamp(56px, 8vw, 96px); }
.proof h2 { margin-bottom: 28px; }
.table-scroll { overflow-x: auto; }
.spec { width: 100%; border-collapse: collapse; font-size: .95rem; min-width: 520px; }
.spec th { font: 500 .75rem/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); text-align: left; padding: 12px 14px; border-bottom: 1px solid #2a3248; }
.spec td { padding: 14px; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
.spec .pass { color: var(--pass); font-family: var(--f-mono); font-size: .9rem; }
.spec .mono { font-family: var(--f-mono); }
.proof-facts { list-style: none; padding: 0; margin: 40px 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.proof-facts li { display: grid; gap: 4px; border-left: 2px solid var(--blue); padding-left: 16px; }
.proof-facts b { font: 700 2.2rem/1 var(--f-display); font-variant-numeric: tabular-nums; }
.proof-facts span { color: var(--muted); font-size: .9rem; }

/* contact */
.contact { padding-block: clamp(64px, 9vw, 112px); display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.contact-main p { color: #c4cbda; max-width: 52ch; }
.regions { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.regions li { display: grid; gap: 2px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 8px; }
.regions b { font-family: var(--f-display); }
.regions span { color: var(--muted); font-size: .88rem; }
.members-card { display: grid; gap: 10px; text-decoration: none; padding: 26px; border: 1px solid #2c3270; border-radius: 12px; background: radial-gradient(120% 120% at 100% 0%, rgba(43, 53, 255, .22), transparent 60%), var(--panel); }
.members-card:hover { border-color: var(--blue); }
.members-card svg { width: 22px; height: 22px; color: var(--ice); }
.members-t { font: 700 1.15rem/1.25 var(--f-display); }
.members-d { color: var(--muted); font-size: .92rem; }
.members-card .banner-go { padding: 6px 0 0; text-align: left; }

/* value pages */
.vp-hero { border-bottom: 1px solid var(--line); background: radial-gradient(90% 140% at 100% 0%, rgba(43, 53, 255, .2), transparent 60%); }
.vp-saving-lives .vp-hero { background: radial-gradient(80% 140% at 100% 0%, rgba(255, 122, 47, .22), transparent 60%), radial-gradient(60% 120% at 70% 100%, rgba(87, 176, 255, .14), transparent 60%); }
.vp-hero-in { position: relative; padding-block: 48px 64px; display: grid; gap: 18px; justify-items: start; }
.vp-hero h1 { font-size: clamp(2.6rem, 7vw, 4.6rem); font-weight: 800; letter-spacing: -.03em; }
.vp-lead { color: #c4cbda; font-size: 1.15rem; max-width: 40rem; margin: 0; }
.vp-icon { position: absolute; right: max(20px, env(safe-area-inset-right, 0px)); bottom: 40px; width: 150px; height: 150px; opacity: .9; }
.vp-icon svg { width: 100%; height: 100%; }
.crumb { font: 500 .88rem/1 var(--f-display); color: var(--muted); text-decoration: none; }
.crumb:hover { color: var(--fg); }
.prose { padding-block: 56px 8px; display: grid; gap: 14px; justify-items: start; }
.prose h2 { font-size: 1.5rem; margin-top: 18px; }
.prose p { margin: 0; color: #c4cbda; max-width: 65ch; }
.sec-h { font-size: 1.5rem; margin: 48px 0 20px; }
.mech { padding-block: 40px 8px; }
.mech h2 { font-size: 1.5rem; margin-bottom: 22px; }
.mech-fig { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); padding: 18px; margin-bottom: 24px; }
.mech-fig svg { min-width: 620px; width: 100%; height: auto; display: block; }
.f-h { fill: var(--fg); font: 600 15px var(--f-display); }
.f-s { fill: var(--muted); font: 400 12.5px var(--f-body); }
.f-q { fill: #6f7891; font: 400 11.5px var(--f-mono); }
.f-hot { fill: var(--fire); font: 600 13px var(--f-mono); }
.f-cer { fill: #fff; font: 700 14px var(--f-display); }
.f-steel { fill: #2a3142; stroke: #3a4459; }
.f-flakes rect { fill: #9aa7c2; }
.f-ceramic { fill: #c86a2c; stroke: #ffb27a; stroke-width: 1.2; }
.f-fire path { fill: var(--fire); opacity: .9; }
.note { color: var(--muted); max-width: 65ch; margin: 22px 0 0; }
.callout { margin-block: 56px 8px; padding-block: 0; }
.callout > * { max-width: 820px; }
.callout h2 { font-size: 1.4rem; margin-bottom: 12px; padding-top: 32px; border-top: 1px solid var(--line); }
.callout p { color: #c4cbda; margin: 0; max-width: 65ch; }
.stack-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 340px)); gap: 28px; align-items: end; }
.stack-t { font: 600 .9rem/1 var(--f-display); color: var(--muted); margin: 0 0 12px; }
.layer { font: 500 .88rem/1 var(--f-mono); padding: 16px 14px; border: 1px solid var(--line); margin-top: -1px; }
.l-mica { background: #2a2617; color: #e5d9a8; }
.l-paint { background: #18203a; color: #b8c6f0; }
.l-conv { background: #142226; color: #a7d3d6; }
.l-steel { background: #222834; color: #c3c9d6; padding-block: 26px; }
.l-geo { background: linear-gradient(90deg, rgba(87, 176, 255, .25), rgba(255, 122, 47, .25)); color: #fff; font-weight: 600; border-color: #3b4a7a; }
.subs { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.subs li { display: grid; gap: 6px; padding: 20px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.subs b { font: 700 1.1rem/1.2 var(--f-display); }
.subs span { color: var(--muted); font-size: .92rem; }
.vp-pager { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; padding-block: 72px; }
.vp-pager a { display: grid; gap: 6px; text-decoration: none; padding: 20px 22px; border: 1px solid var(--line); border-radius: 10px; }
.vp-pager a:hover { border-color: var(--blue); }
.vp-pager .next { text-align: right; }
.vp-pager span { font: 500 .75rem/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.vp-pager b { font: 600 1rem/1.3 var(--f-display); }
.members-in { padding-block: 72px 96px; display: grid; gap: 20px; justify-items: start; }
.members-in > * { max-width: 820px; }
.members-in h1 { font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight: 800; }
.members-note { border: 1px solid #2c3270; border-radius: 12px; background: var(--panel); padding: 22px 24px; display: grid; gap: 10px; }
.members-note p { margin: 0; color: #c4cbda; }

/* footer */
.foot { border-top: 1px solid var(--line); padding-block: 48px; }
.foot-in { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 22px 40px; }
.foot-tag { color: var(--muted); margin: 8px 0 0; font-size: .9rem; }
.foot-links { display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-start; }
.foot-links a { color: var(--muted); text-decoration: none; font-size: .9rem; }
.foot-links a:hover { color: var(--fg); }
.foot-legal { grid-column: 1 / -1; color: #6f7891; font-size: .8rem; margin: 0; }

/* responsive */
@media (max-width: 980px) {
  .banners { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .menu-btn { display: inline-flex; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; flex-direction: column; align-items: stretch; gap: 0; background: var(--ink); border-bottom: 1px solid var(--line); padding: 8px max(20px, env(safe-area-inset-right, 0px)) 16px max(20px, env(safe-area-inset-left, 0px)); }
  .nav.open { display: flex; }
  .nav a { padding-block: 14px; border-bottom: 1px solid var(--line); }
  .nav-members { margin-top: 12px; justify-content: center; }
  .top-tools { margin-left: auto; }
  .hero-media { width: 100%; opacity: .55; }
  .contact { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .banners { grid-template-columns: minmax(0, 1fr); }
  .detail-row { grid-template-columns: minmax(0, 1fr); padding-block: 32px; }
  .proof-facts, .subs { grid-template-columns: minmax(0, 1fr); }
  .regions { grid-template-columns: minmax(0, 1fr); }
  .vp-icon { display: none; }
  .vp-pager { grid-template-columns: minmax(0, 1fr); }
  .vp-pager .next { text-align: left; }
  .foot-in { grid-template-columns: minmax(0, 1fr); }
  .stack-cols { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .banner { transition: none; }
  .banner:hover { transform: none; }
}

/* members lock + playbook */
.lock { display: grid; gap: 14px; width: 100%; max-width: 560px; border: 1px solid #2c3270; border-radius: 12px; background: var(--panel); padding: 24px; }
.lock label { color: #c4cbda; }
.lock-row { display: flex; flex-wrap: wrap; gap: 10px; }
.lock-row input { flex: 1 1 220px; min-width: 0; font: 500 1rem/1 var(--f-body); color: var(--fg); background: var(--ink); border: 1px solid #39425a; border-radius: 999px; padding: 14px 18px; }
.lock-row input:focus { outline: 2px solid var(--ice); outline-offset: 2px; border-color: transparent; }
.lock-row .btn { border: 0; cursor: pointer; }
.lock-row .btn:disabled { opacity: .6; cursor: progress; }
.lock-msg { margin: 0; min-height: 1.4em; color: var(--fire); font-size: .92rem; }
.playbook { scroll-margin-top: 88px; padding-block: 8px 96px; font-family: "IBM Plex Sans KR", var(--f-body); }
.playbook > * { max-width: 820px; }
.playbook > .table-scroll, .playbook > figure, .playbook > p:has(img) { max-width: 1000px; }
.playbook h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); margin: 64px 0 18px; padding-top: 32px; border-top: 1px solid var(--line); }
.playbook h1:first-child { margin-top: 0; border-top: 0; padding-top: 0; font-size: clamp(2.2rem, 5vw, 3.2rem); }
.playbook h2 { font-size: 1.55rem; margin: 48px 0 14px; }
.playbook h3 { font-size: 1.2rem; margin: 32px 0 10px; color: #dfe4f0; }
.playbook p, .playbook li { color: #c4cbda; }
.playbook strong { color: var(--fg); }
.playbook ul, .playbook ol { padding-left: 1.3em; }
.playbook li p { margin: .3em 0; }
.playbook blockquote { margin: 24px 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--blue); color: #dfe4f0; font-style: italic; }
.playbook img { border-radius: 10px; border: 1px solid var(--line); }
.playbook .table-scroll { margin: 18px 0; }
.playbook .spec { min-width: 560px; font-size: .9rem; }
.playbook .spec th { text-transform: none; letter-spacing: 0; font-family: var(--f-body); font-weight: 600; font-size: .82rem; }
.playbook .spec td { vertical-align: top; color: #c4cbda; }
.playbook input[type="checkbox"] { accent-color: var(--blue); margin-right: 8px; }
.pb-diagram { margin: 22px 0; background: #fff; border-radius: 10px; padding: 8px; }
.pb-diagram img { border: 0; }
.pb-diagram figcaption { color: #5a6380; font-size: .8rem; padding: 6px 8px 2px; }
.pb-ph { display: grid; gap: 4px; margin: 20px 0; padding: 16px 20px; border: 2px solid #ef4444; border-radius: 8px; background: rgba(239, 68, 68, .07); }
.pb-ph b { color: #ff8a8a; font-family: var(--f-display); }
.pb-ph span { color: #c4cbda; font-size: .9rem; }

/* playbook reader */
.reader { padding-block: 0 64px; scroll-margin-top: 72px; }
.reader-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-block: 8px 18px; }
.reader-nav { display: flex; align-items: center; gap: 10px; }
.r-btn { width: 44px; height: 44px; border-radius: 50%; border: 1px solid #39425a; background: transparent; color: var(--fg); font: 400 1.6rem/1 var(--f-display); cursor: pointer; }
.r-btn:hover:not(:disabled) { border-color: var(--fg); }
.r-btn:disabled { opacity: .35; cursor: default; }
.r-count { font: 500 .9rem/1 var(--f-mono); color: var(--muted); min-width: 72px; text-align: center; font-variant-numeric: tabular-nums; }
.r-pdf { border: 0; cursor: pointer; }
.reader-stage { position: relative; display: flex; justify-content: center; overflow: hidden; padding-left: max(8px, env(safe-area-inset-left, 0px)); padding-right: max(8px, env(safe-area-inset-right, 0px)); }
.book { display: flex; gap: 4px; transform-origin: top center; flex: none; }
.book .pg { box-shadow: 0 24px 60px rgba(0, 0, 0, .55); }
.book .pg[hidden] { display: none !important; }
.reader-hint { color: var(--muted); font-size: .85rem; text-align: center; margin-top: 18px; }

/* group resource center */
.gr-hero .vp-hero-in { padding-block: 40px 52px; }
.signout { position: absolute; right: max(20px, env(safe-area-inset-right, 0px)); top: 44px; font: 500 .85rem/1 var(--f-display); color: var(--muted); text-decoration: none; border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px; }
.signout:hover { color: var(--fg); border-color: var(--muted); }
.gr-sec { padding-block: 48px 8px; display: grid; gap: 22px; }
.gr-sec h2 { font-size: 1.5rem; }
.gr-sec-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.gr-sec-head .more { margin: 0; }
.feature { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 28px; text-decoration: none; padding: 26px 30px; border: 1px solid #2c3270; border-radius: 12px; background: radial-gradient(100% 140% at 100% 0%, rgba(43, 53, 255, .25), transparent 60%), var(--panel); transition: border-color .2s ease; }
.feature:hover { border-color: var(--blue); }
.feature-icon { width: 96px; height: 96px; display: grid; place-items: center; background: #0e1220; border-radius: 12px; }
.feature-icon svg { width: 72px; height: 72px; }
.feature-text { display: grid; gap: 8px; justify-items: start; }
.feature-text b { font: 700 1.5rem/1.2 var(--f-display); }
.feature-text > span:last-child { color: var(--muted); }
.feature .banner-go { padding: 0; }
.banners-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.chip { display: inline-block; font: 500 .72rem/1 var(--f-mono); letter-spacing: .04em; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 5px 7px; white-space: nowrap; }
.chip-soon { color: #8a92a6; border-style: dashed; }
.chip-go { color: #fff; background: var(--blue); border-color: var(--blue); text-decoration: none; font-family: var(--f-display); font-weight: 600; letter-spacing: 0; padding: 7px 12px; border-radius: 999px; }
.news { list-style: none; padding: 0; margin: 0; display: grid; }
.news li { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 18px; padding-block: 22px; border-top: 1px solid var(--line); }
.news time { font: 500 .85rem/1.6 var(--f-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.news h3 { font-size: 1.1rem; margin: 10px 0 6px; }
.news p { margin: 0; color: #c4cbda; max-width: 70ch; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.card { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); padding: 22px; display: grid; gap: 12px; align-content: start; min-width: 0; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.card-head h3 { font-size: 1.25rem; }
.card-sub { margin: 0; color: var(--muted); font-size: .9rem; }
.card .spec { min-width: 0; }
.kv th { text-transform: none; letter-spacing: 0; font: 600 .85rem/1.4 var(--f-display); color: var(--fg); width: 34%; vertical-align: top; border-bottom: 1px solid var(--line); padding: 12px 14px 12px 0; }
.kv td { color: #c4cbda; font-size: .92rem; padding-left: 0; }
.files { list-style: none; padding: 0; margin: 0; display: grid; }
.files li { display: grid; grid-template-columns: 90px minmax(0, 1fr) auto auto; align-items: center; gap: 16px; padding-block: 18px; border-top: 1px solid var(--line); }
.files li .chip:first-child { justify-self: start; }
.files b { font: 600 1rem/1.4 var(--f-display); }
.langs { font: 500 .8rem/1 var(--f-mono); color: var(--muted); }
.empty { border: 1px dashed #39425a; border-radius: 12px; padding: 28px; display: grid; gap: 8px; }
.empty b { font: 600 1.05rem/1.3 var(--f-display); }
.empty p { margin: 0; color: var(--muted); max-width: 62ch; }
.note-top { margin: 0; }
@media (max-width: 980px) { .banners-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .cards { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 640px) {
  .banners-3 { grid-template-columns: minmax(0, 1fr); }
  .feature { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .news li { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .files li { grid-template-columns: minmax(0, 1fr) auto; }
  .files li .chip:first-child, .files .langs { grid-column: 1; }
  .signout { position: static; }
}
.gr { padding-bottom: 72px; }