/* ============================================================
   cxm 希盟量子 · 全站样式表（深空 / 全息青紫）
   ============================================================ */
:root {
  --brand: #4F46E5;
  --brand-2: #7B61FF;
  --brand-3: #00D4FF;
  --accent: #FF5EDB;
  --ink: #0B1030;
  --ink-2: #3A4368;
  --muted: #6F7A9C;
  --line: #E3E8F7;
  --bg: #ffffff;
  --bg-soft: #F6F8FF;
  --bg-soft-2: #EEF2FF;
  --deep: #0A0E27;
  --holo: linear-gradient(100deg, #00D4FF 0%, #7B61FF 50%, #FF5EDB 100%);
  --radius: 18px;
  --shadow: 0 12px 34px rgba(16, 22, 58, .10);
  --shadow-lg: 0 22px 56px rgba(16, 22, 58, .16);
  --max: 1200px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink-2);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.32; margin: 0 0 .6em; font-weight: 700; }
p { margin: 0 0 1em; }
.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.section { padding: 92px 0; }
.section--soft { background: var(--bg-soft); }
.section--soft2 { background: linear-gradient(180deg, #f6f8ff 0%, #eef2ff 100%); }

/* ---------- topbar ---------- */
.topbar { background: #070B1E; color: #9aa8d4; font-size: 13px; }
.topbar .container { display: flex; align-items: center; justify-content: space-between; min-height: 42px; gap: 16px; }
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.topbar a { color: #9aa8d4; transition: color .2s; }
.topbar a:hover { color: #fff; }
.topbar .lang-link { display: inline-flex; align-items: center; gap: 6px; background: rgba(123,97,255,.22); border: 1px solid rgba(0,212,255,.42); padding: 4px 13px; border-radius: 20px; color: #b8f0ff; font-weight: 700; }
.topbar .lang-link:hover { background: rgba(123,97,255,.36); }
.topbar .dot { width: 6px; height: 6px; border-radius: 50%; background: #4ade80; display: inline-block; }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 74px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand img { width: 40px; height: 40px; border-radius: 11px; }
.brand-name { font-size: 21px; font-weight: 800; letter-spacing: -.4px; color: var(--ink); }
.brand-name span { color: var(--brand); }
.brand-sub { font-size: 10.5px; color: var(--muted); letter-spacing: 2px; display: block; margin-top: -3px; }
.main-nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.main-nav a { padding: 8px 13px; border-radius: 9px; font-size: 15px; color: var(--ink-2); font-weight: 500; transition: .2s; white-space: nowrap; }
.main-nav a:hover { color: var(--brand); background: var(--bg-soft-2); }
.main-nav a.active { color: var(--brand); background: #e9edff; font-weight: 700; }
.nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border-radius: 11px; font-size: 15px; font-weight: 700; border: 1px solid transparent; cursor: pointer; transition: .22s; white-space: nowrap; }
.btn-primary { background: var(--holo); color: #fff; box-shadow: 0 10px 24px rgba(79,70,229,.26); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(79,70,229,.36); }
.btn-dark { background: #0A0E27; color: #fff; }
.btn-dark:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(10,14,39,.26); }
.btn-ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--brand-2); color: var(--brand); transform: translateY(-2px); }
.btn-light { background: rgba(255,255,255,.14); border-color: rgba(255,255,255,.48); color: #fff; }
.btn-light:hover { background: rgba(255,255,255,.26); transform: translateY(-2px); }
.btn-white { background: #fff; color: var(--brand); }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0,0,0,.14); }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-lg { padding: 15px 30px; font-size: 16px; }

/* ---------- hero (dark cosmos) ---------- */
.hero { position: relative; overflow: hidden; padding: 82px 0 96px; background: linear-gradient(160deg, #070B1E 0%, #10163A 55%, #160F38 100%); }
.hero::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.42) 1px, transparent 1px); background-size: 30px 30px; opacity: .22; }
.hero::after { content: ""; position: absolute; width: 620px; height: 620px; right: -160px; top: -220px; border-radius: 50%; background: radial-gradient(circle, rgba(123,97,255,.42), transparent 70%); filter: blur(10px); }
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1fr 1.12fr; gap: 52px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; background: rgba(0,212,255,.12); color: #8ee9ff; border: 1px solid rgba(0,212,255,.38); padding: 6px 14px; border-radius: 30px; font-size: 13px; font-weight: 700; margin-bottom: 22px; }
.eyebrow .pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(255,94,219,.2); }
.hero h1 { color: #fff; font-size: clamp(36px, 4.2vw, 55px); letter-spacing: -1.5px; margin-bottom: 20px; }
.hero h1 .grad { background: var(--holo); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-lead { color: #b9c6e8; font-size: 17px; max-width: 540px; margin-bottom: 30px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }
.hero .btn-ghost { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.3); color: #fff; }
.hero .btn-ghost:hover { background: rgba(255,255,255,.18); color: #fff; }
.hero-meta { display: flex; gap: 26px; flex-wrap: wrap; font-size: 14px; color: #9aa8d4; }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta b { color: #fff; font-size: 15px; }
.hero-meta i { color: #00D4FF; font-style: normal; font-weight: 800; }
.hero-figure img { width: 100%; border-radius: 26px; box-shadow: 0 24px 60px rgba(0,0,0,.4); }
/* 浅色 Hero 变体（次主页 / 下载中心） */
.hero--light { background: linear-gradient(160deg, #eef2ff 0%, #ffffff 55%, #f5efff 100%); }
.hero--light::after { background: radial-gradient(circle, rgba(123,97,255,.18), transparent 70%); }
.hero--light::before { background-image: radial-gradient(#b9c4ea 1.2px, transparent 1.2px); opacity: .4; }
.hero--light h1 { color: var(--ink); }
.hero--light .eyebrow { background: #e9edff; color: var(--brand); border-color: #cfd8fb; }
.hero--light .eyebrow .pulse { background: var(--accent); }
.hero--light .hero-lead { color: var(--muted); }
.hero--light .hero-meta { color: var(--muted); }
.hero--light .hero-meta b { color: var(--ink); }
.hero--light .hero-meta i { color: var(--brand); }
.hero--light .btn-ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.hero--light .btn-ghost:hover { background: #fff; color: var(--brand); }
.hero--light .hero-figure img { box-shadow: var(--shadow-lg); }

/* ---------- trust ---------- */
.trust { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; padding: 26px 0; }
.trust-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.trust-label { font-size: 13px; color: var(--muted); margin: 0; flex-shrink: 0; }
.trust-logos { display: flex; gap: 32px; flex-wrap: wrap; align-items: center; }
.trust-logos span { font-size: 17px; font-weight: 700; color: #9aa6c8; letter-spacing: .5px; }

/* ---------- section head ---------- */
.sec-head { text-align: center; max-width: 740px; margin: 0 auto 52px; }
.sec-kicker { display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 2px; color: var(--brand); text-transform: uppercase; margin-bottom: 12px; }
.sec-head h2 { font-size: clamp(28px, 3vw, 38px); letter-spacing: -.8px; }
.sec-head p { color: var(--muted); font-size: 16px; margin: 0; }
.sec-head--left { text-align: left; margin-left: 0; }

/* ---------- cards ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; transition: .25s; position: relative; overflow: hidden; }
.card:hover { transform: translateY(-6px); border-color: #c7d0f5; box-shadow: var(--shadow-lg); }
.card-icon { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; background: linear-gradient(140deg, #e9edff, #e6faff); margin-bottom: 20px; }
.card-icon svg { width: 27px; height: 27px; }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 14.5px; margin: 0 0 16px; }
.card-link { font-size: 14px; font-weight: 700; color: var(--brand); display: inline-flex; align-items: center; gap: 6px; transition: gap .2s; }
.card-link:hover { gap: 10px; }
.card-tag { position: absolute; top: 20px; right: 20px; background: #fdf0fb; color: #B0249F; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 20px; }

/* ---------- split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.split img { width: 100%; border-radius: 22px; box-shadow: var(--shadow); }
.split h2 { font-size: clamp(26px, 2.8vw, 36px); letter-spacing: -.8px; }
.split .lead { color: var(--muted); font-size: 16px; }
.feature-list { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 16px; }
.feature-list li { display: flex; gap: 13px; align-items: flex-start; font-size: 15px; }
.feature-list .tick { flex: 0 0 22px; width: 22px; height: 22px; border-radius: 50%; background: #e9edff; color: var(--brand); display: grid; place-items: center; font-size: 12px; font-weight: 800; margin-top: 3px; }
.feature-list b { color: var(--ink); }

/* ---------- cosmos band / stats ---------- */
.cosmos-band { position: relative; overflow: hidden; border-radius: 26px; padding: 46px 40px; background: linear-gradient(115deg, #070B1E, #1B2160 55%, #3A1A63); display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.cosmos-band::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.5) 1px, transparent 1px); background-size: 26px 26px; opacity: .18; }
.cosmos-band::after { content: ""; position: absolute; width: 380px; height: 380px; right: -100px; bottom: -220px; border-radius: 50%; background: rgba(0,212,255,.2); filter: blur(28px); }
.cosmos-band > * { position: relative; z-index: 1; }
.metric strong { display: block; font-size: 32px; font-weight: 800; letter-spacing: -.8px; color: #8ee9ff; }
.metric span { font-size: 14px; color: #b9c6e8; }
.metric em { display: block; width: 28px; height: 4px; border-radius: 2px; background: var(--accent); margin: 0 auto 12px; font-style: normal; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { text-align: center; padding: 26px 14px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
.stat strong { display: block; font-size: 34px; font-weight: 800; letter-spacing: -1px; color: var(--brand); line-height: 1.2; }
.stat span { font-size: 14px; color: var(--muted); }

/* ---------- new: qubit grid / holo card / spec panel / lab flow ---------- */
.qubit-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.qubit-item { background: #fff; border: 1px solid var(--line); border-radius: 15px; padding: 22px 20px; border-top: 4px solid transparent; border-image: linear-gradient(90deg, #00D4FF, #7B61FF, #FF5EDB) 1; }
.qubit-item strong { display: block; font-size: 25px; font-weight: 800; color: var(--brand); letter-spacing: -.5px; }
.qubit-item b { display: block; color: var(--ink); font-size: 14.5px; margin: 4px 0 5px; }
.qubit-item span { font-size: 13px; color: var(--muted); }
.holo-card { position: relative; background: #0A0E27; border-radius: 18px; padding: 28px 30px; color: #dfe6ff; overflow: hidden; }
.holo-card::before { content: ""; position: absolute; inset: 0; background-image: radial-gradient(rgba(255,255,255,.5) 1px, transparent 1px); background-size: 24px 24px; opacity: .12; }
.holo-card > * { position: relative; z-index: 1; }
.holo-card h3 { color: #fff; font-size: 18px; margin-bottom: 12px; }
.holo-card p { font-size: 14px; color: #b9c6e8; margin: 0; }
.holo-card .htag { display: inline-block; font-size: 11.5px; font-weight: 700; color: #8ee9ff; background: rgba(0,212,255,.14); border: 1px solid rgba(0,212,255,.32); padding: 4px 11px; border-radius: 20px; margin-bottom: 14px; }
.spec-panel { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.spec-panel > div { padding: 16px 20px; border-right: 1px solid var(--line); font-size: 14px; }
.spec-panel > div:last-child { border-right: none; }
.spec-panel .phead { background: var(--bg-soft-2); font-weight: 700; color: var(--ink); }
.spec-panel .pname { font-weight: 700; color: var(--ink); font-family: Consolas, Monaco, monospace; font-size: 13.5px; }
.lab-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 26px; }
.lab-step { position: relative; background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 20px 18px; }
.lab-step:not(:last-child)::after { content: "→"; position: absolute; right: -15px; top: 50%; transform: translateY(-50%); color: var(--brand-2); font-size: 18px; font-weight: 700; z-index: 2; }
.lab-step b { display: block; color: var(--ink); font-size: 15px; margin-bottom: 4px; }
.lab-step span { font-size: 13px; color: var(--muted); }

/* ---------- cta ---------- */
.cta { position: relative; overflow: hidden; border-radius: 28px; padding: 62px 56px; background: linear-gradient(120deg, #070B1E 0%, #242A72 55%, #5A2175 100%); color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.cta::after { content: ""; position: absolute; width: 420px; height: 420px; right: -90px; top: -160px; border-radius: 50%; background: rgba(0,212,255,.16); }
.cta::before { content: ""; position: absolute; width: 260px; height: 260px; right: 160px; bottom: -180px; border-radius: 50%; background: rgba(255,94,219,.14); }
.cta > * { position: relative; z-index: 1; }
.cta h2 { color: #fff; font-size: clamp(26px, 3vw, 36px); margin-bottom: 10px; }
.cta p { color: #c9d4f5; margin: 0; font-size: 16px; }
.cta-btns { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- page hero ---------- */
.page-hero { padding: 60px 0 26px; background: linear-gradient(160deg, #eef2ff, #fff 72%); }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 22px; }
.crumb a:hover { color: var(--brand); }
.crumb span { margin: 0 8px; color: #c4cce8; }
.page-hero h1 { font-size: clamp(30px, 3.6vw, 46px); letter-spacing: -1px; margin-bottom: 14px; }
.page-hero .lead { font-size: 17px; color: var(--muted); max-width: 780px; margin: 0; }

/* ---------- download ---------- */
.dl-hero-card { display: grid; grid-template-columns: 1fr 1.05fr; gap: 44px; align-items: center; background: #fff; border: 1px solid var(--line); border-radius: 26px; padding: 38px; box-shadow: var(--shadow); margin-top: 34px; }
.dl-hero-card img { border-radius: 18px; width: 100%; }
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.dl-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: .25s; display: flex; flex-direction: column; }
.dl-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: #c7d0f5; }
.dl-card-media { background: linear-gradient(140deg, #e9edff, #e6faff); padding: 24px; display: grid; place-items: center; min-height: 150px; }
.dl-card-media svg { width: 78px; height: 78px; }
.os-svg { width: 82px; height: 82px; color: var(--brand); }
.dl-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.dl-card-body h3 { font-size: 19px; margin-bottom: 6px; }
.dl-card-body .ver { font-size: 13px; color: var(--brand); font-weight: 700; margin-bottom: 12px; }
.dl-card-body p { font-size: 14px; color: var(--muted); flex: 1; }
.dl-meta { display: flex; justify-content: space-between; font-size: 12.5px; color: #8b97b8; border-top: 1px dashed var(--line); padding-top: 14px; margin-bottom: 16px; }
.dl-card .btn { width: 100%; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 14.5px; }
th, td { text-align: left; padding: 15px 20px; border-bottom: 1px solid var(--line); }
th { background: var(--bg-soft-2); color: var(--ink); font-weight: 700; }
tr:last-child td { border-bottom: none; }
.badge { display: inline-block; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 20px; background: #e9edff; color: var(--brand); white-space: nowrap; }
.badge--green { background: #e4f7f4; color: #0A8C85; }
.notice { background: #f0f4ff; border: 1px solid #cfd9f8; border-radius: 14px; padding: 18px 22px; font-size: 14.5px; color: #3A4A84; }

/* ---------- steps / timeline / zones ---------- */
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
.step { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; position: relative; }
.step::before { counter-increment: step; content: "0" counter(step); position: absolute; top: 22px; right: 24px; font-size: 30px; font-weight: 800; color: #e2e8fb; }
.step h3 { font-size: 18px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; margin: 0; }
.timeline { display: grid; max-width: 860px; margin: 0 auto; }
.timeline-item { display: grid; grid-template-columns: 54px 1fr; gap: 20px; padding-bottom: 30px; position: relative; }
.timeline-item:not(:last-child)::before { content: ""; position: absolute; left: 26px; top: 52px; bottom: 0; width: 2px; background: #dfe6fa; }
.timeline-num { width: 54px; height: 54px; border-radius: 16px; background: #e9edff; color: var(--brand); font-weight: 800; font-size: 18px; display: grid; place-items: center; }
.timeline-item h3 { font-size: 18px; margin: 8px 0 6px; }
.timeline-item p { color: var(--muted); font-size: 14.5px; margin: 0; }
.zone-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 26px; }
.zone-item { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 15px 18px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.zone-item b { color: var(--ink); font-size: 15px; }
.zone-item small { color: var(--muted); font-size: 12.5px; display: block; }
.zone-item .az { font-size: 12px; font-weight: 700; color: var(--brand); background: #e9edff; padding: 4px 10px; border-radius: 20px; white-space: nowrap; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.chips span { background: #fff; border: 1px solid var(--line); color: var(--ink-2); font-size: 13.5px; padding: 7px 15px; border-radius: 30px; }
.quote-card { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--brand-2); border-radius: 14px; padding: 26px 28px; }
.quote-card p { font-size: 15.5px; color: var(--ink-2); margin-bottom: 14px; }
.quote-card .who { font-size: 13.5px; color: var(--muted); font-weight: 600; }

/* ---------- faq ---------- */
.faq { display: grid; gap: 14px; max-width: 900px; margin: 0 auto; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px; }
.faq summary { cursor: pointer; font-weight: 700; color: var(--ink); font-size: 16px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--brand); font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 14px 0 0; color: var(--muted); font-size: 14.5px; }

/* ---------- footer ---------- */
.site-footer { background: #070B1E; color: #9aa8d4; padding: 68px 0 26px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(4, 1fr); gap: 40px; padding-bottom: 46px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 14px; max-width: 330px; margin: 18px 0 22px; line-height: 1.9; }
.footer-brand .f-logo { display: inline-flex; align-items: center; gap: 11px; }
.footer-brand .f-logo img { width: 38px; height: 38px; border-radius: 10px; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 18px; }
.footer-col a { display: block; font-size: 14px; padding: 5px 0; transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-top: 22px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; }
.footer-bottom a { margin-left: 18px; }
.footer-bottom a:hover { color: #fff; }

/* ---------- misc ---------- */
.text-center { text-align: center; }
.mt-30 { margin-top: 30px; }
.mt-46 { margin-top: 46px; }
.reveal { animation: rise .7s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .main-nav a { padding: 7px 9px; font-size: 14px; }
  .hero-grid, .split, .dl-hero-card { gap: 34px; }
  .grid-4, .qubit-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .cosmos-band { padding: 36px 24px; }
}
@media (max-width: 820px) {
  .section { padding: 64px 0; }
  .hero { padding: 56px 0 66px; }
  .hero-grid, .split, .dl-hero-card { grid-template-columns: 1fr; }
  .hero-figure { order: -1; }
  .grid-3, .dl-grid, .step-grid { grid-template-columns: repeat(2, 1fr); }
  .stats, .cosmos-band, .lab-flow { grid-template-columns: repeat(2, 1fr); }
  .lab-step:nth-child(2)::after { display: none; }
  .spec-panel { grid-template-columns: 1fr 1fr; }
  .spec-panel > div:nth-child(2) { border-right: none; }
  .nav-wrap { height: auto; padding: 12px 0; flex-wrap: wrap; }
  .main-nav { order: 3; width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 6px; }
  .main-nav a { white-space: nowrap; }
  .cta { padding: 42px 30px; }
  .dl-hero-card { padding: 24px; }
}
@media (max-width: 560px) {
  .container { width: min(var(--max), calc(100% - 32px)); }
  .grid-3, .grid-2, .dl-grid, .grid-4, .stats, .step-grid, .zone-list, .cosmos-band, .qubit-grid, .lab-flow, .spec-panel { grid-template-columns: 1fr; }
  .spec-panel > div { border-right: none; border-bottom: 1px solid var(--line); }
  .lab-step::after { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .topbar-right { display: none; }
  .hero h1 { font-size: 34px; }
  .cta { padding: 34px 24px; }
}