:root {
  color-scheme: dark;
  --ink: #0a0f0e;
  --ink-soft: #111817;
  --ink-raised: #18211f;
  --paper: #141c1a;
  --paper-warm: #18201e;
  --text: #f4f8f6;
  --text-dark: #edf3f0;
  --muted: #a9b6b1;
  --muted-dark: #a7b4af;
  --line: #2a3633;
  --line-light: #34413d;
  --mint: #52dfc3;
  --mint-strong: #20b895;
  --green: #7ce08d;
  --amber: #f2b75d;
  --blue: #78a8ff;
  --max-width: 1180px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { min-width: 320px; margin: 0; overflow-x: hidden; color: var(--text-dark); background: var(--paper); font-size: 16px; line-height: 1.6; letter-spacing: 0; }
body.menu-open { overflow: hidden; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
button { font: inherit; }
img { display: block; max-width: 100%; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 100; padding: 10px 14px; color: var(--ink); background: var(--mint); text-decoration: none; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.section-shell { width: min(calc(100% - 48px), var(--max-width)); margin: 0 auto; }

/* Navigation */
.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(255, 255, 255, 0.09); color: var(--text); background: rgba(10, 15, 14, 0.94); backdrop-filter: blur(14px); }
.nav-shell { display: flex; width: min(calc(100% - 48px), var(--max-width)); height: 72px; margin: 0 auto; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; min-height: 44px; align-items: center; gap: 11px; color: inherit; font-size: 20px; font-weight: 760; text-decoration: none; }
.brand img { width: 38px; height: 38px; object-fit: contain; }
.desktop-nav { display: flex; align-items: center; gap: 30px; }
.desktop-nav a, .text-link { display: inline-flex; min-height: 44px; align-items: center; color: #c2ccc8; font-size: 14px; font-weight: 560; text-decoration: none; transition: color 180ms ease; }
.desktop-nav a:hover, .text-link:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 16px; }

.button { display: inline-flex; min-height: 50px; padding: 0 22px; border: 1px solid transparent; border-radius: 6px; align-items: center; justify-content: center; gap: 10px; font-size: 15px; font-weight: 720; line-height: 1.2; text-align: center; text-decoration: none; cursor: pointer; transition: color 180ms ease, background 180ms ease, border-color 180ms ease, transform 180ms ease; }
.button:hover { transform: translateY(-2px); }
.button-small { min-height: 42px; padding: 0 16px; font-size: 14px; }
.button-primary { color: #06110e; background: var(--mint); box-shadow: 0 10px 30px rgba(32, 184, 149, 0.16); }
.button-primary:hover { background: #78ecd5; }
.button-ghost { border-color: #43514d; color: var(--text); background: rgba(17, 24, 23, 0.72); }
.button-ghost:hover { border-color: var(--mint); background: var(--ink-raised); }
.button-outline { margin-top: 28px; border-color: #4b5a56; color: var(--text); background: transparent; }
.button-outline:hover { border-color: var(--mint); color: var(--mint); }
.button-inverse { color: var(--ink); background: #f4f7f4; }
.button-inverse:hover { background: #ffffff; }
.button-inverse-ghost { border-color: rgba(10, 15, 14, 0.38); color: var(--ink); }
.button-inverse-ghost:hover { border-color: var(--ink); background: rgba(255, 255, 255, 0.28); }

.menu-button { display: none; width: 44px; height: 44px; padding: 0; border: 1px solid #3b4844; border-radius: 6px; align-items: center; justify-content: center; flex-direction: column; gap: 5px; color: var(--text); background: transparent; cursor: pointer; }
.menu-button span { width: 18px; height: 1px; background: currentColor; transition: transform 180ms ease, opacity 180ms ease; }
.menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.mobile-menu { position: fixed; inset: 73px 0 auto; z-index: 40; height: calc(100svh - 73px); padding: 24px; overflow-y: auto; background: var(--ink); }
.mobile-menu[hidden] { display: none; }
.mobile-menu a { display: flex; min-height: 56px; border-bottom: 1px solid var(--line); align-items: center; color: var(--text); font-size: 18px; text-decoration: none; }

/* Full-bleed API routing scene */
.hero { position: relative; display: flex; min-height: calc(100svh - 128px); max-height: 820px; overflow: hidden; align-items: center; color: var(--text); background: var(--ink); }
.hero::before, .hero::after { content: ""; position: absolute; pointer-events: none; }
.hero::before { top: 0; bottom: 0; left: 9%; width: 1px; background: rgba(255, 255, 255, 0.06); box-shadow: 260px 0 rgba(255, 255, 255, 0.035), 520px 0 rgba(255, 255, 255, 0.035), 780px 0 rgba(255, 255, 255, 0.035), 1040px 0 rgba(255, 255, 255, 0.035); }
.hero::after { right: 0; bottom: 88px; left: 0; height: 1px; background: rgba(255, 255, 255, 0.08); box-shadow: 0 -180px rgba(255, 255, 255, 0.035), 0 -360px rgba(255, 255, 255, 0.035); }
.hero-scene { position: absolute; inset: 0; overflow: hidden; opacity: 0.82; }
.hero-scene::before { content: ""; position: absolute; top: 10%; bottom: 10%; left: 48%; z-index: 1; width: 1px; background: rgba(82, 223, 195, 0.2); box-shadow: 12px 0 rgba(82, 223, 195, 0.08), 24px 0 rgba(82, 223, 195, 0.035); animation: scene-scan 6.4s cubic-bezier(0.45, 0, 0.55, 1) infinite; }
.hero-scene::after { content: "LIVE ROUTING / 03 CHANNELS"; position: absolute; top: 11%; right: 7%; color: #60716b; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 9px; font-weight: 700; }
.signal-lane { position: absolute; right: 7%; left: 48%; height: 1px; background: #33413d; }
.lane-one { top: 28%; }.lane-two { top: 50%; }.lane-three { top: 72%; }
.signal-lane span { position: absolute; top: -3px; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 16px rgba(82, 223, 195, 0.8); animation: signal-travel 4.8s ease-in-out infinite; }
.signal-lane span::before { content: ""; position: absolute; top: 3px; right: 4px; width: 54px; height: 1px; background: rgba(82, 223, 195, 0.42); }
.signal-lane span::after { content: ""; position: absolute; top: -7px; left: -7px; width: 19px; height: 19px; border: 1px solid rgba(82, 223, 195, 0.35); border-radius: 50%; animation: packet-ping 1.9s ease-out infinite; }
.lane-two span { background: var(--amber); box-shadow: 0 0 16px rgba(242, 183, 93, 0.8); animation-delay: -2.1s; }.lane-three span { background: var(--blue); box-shadow: 0 0 16px rgba(120, 168, 255, 0.8); animation-delay: -3.2s; }
.lane-two span::before { background: rgba(242, 183, 93, 0.4); }.lane-two span::after { border-color: rgba(242, 183, 93, 0.35); animation-delay: -0.7s; }.lane-three span::before { background: rgba(120, 168, 255, 0.4); }.lane-three span::after { border-color: rgba(120, 168, 255, 0.35); animation-delay: -1.3s; }
.scene-node { position: absolute; z-index: 1; width: 210px; padding: 12px 14px; border-left: 2px solid var(--mint); color: #d8e2de; background: rgba(10, 15, 14, 0.82); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.scene-node::after { content: ""; position: absolute; top: 14px; right: 12px; width: 5px; height: 5px; border-radius: 50%; color: var(--mint); background: var(--mint); box-shadow: 0 0 10px currentColor; }
.scene-node small, .scene-node strong { display: block; letter-spacing: 0; }.scene-node small { color: #7d8d87; font-size: 10px; }.scene-node strong { overflow: hidden; margin-top: 3px; font-size: 12px; font-weight: 560; text-overflow: ellipsis; white-space: nowrap; }
.node-request { top: 20%; right: 18%; animation: node-flow 4.8s ease-in-out infinite; }.node-router { top: 43%; right: 8%; border-left-color: var(--amber); animation: node-flow 4.8s -1.6s ease-in-out infinite; }.node-router::after { color: var(--amber); background: var(--amber); }.node-response { right: 24%; bottom: 18%; border-left-color: var(--blue); animation: node-flow 4.8s -3.2s ease-in-out infinite; }.node-response::after { color: var(--blue); background: var(--blue); }
.scene-label { position: absolute; color: #71817b; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 11px; }
.label-latency { top: 35%; right: 8%; }.label-model { right: 30%; bottom: 35%; }.label-rate { right: 7%; bottom: 10%; }
.hero-content { position: relative; z-index: 2; padding: 72px 0 68px; text-align: left; }
.hero-content > * { animation: hero-enter 700ms cubic-bezier(0.22, 1, 0.36, 1) both; }
.hero-content > :nth-child(2) { animation-delay: 70ms; }
.hero-content > :nth-child(3) { animation-delay: 130ms; }
.hero-content > :nth-child(4) { animation-delay: 180ms; }
.hero-content > :nth-child(5) { animation-delay: 230ms; }
.hero-content > :nth-child(6) { animation-delay: 290ms; }
.status-line { display: inline-flex; margin: 0; align-items: center; gap: 10px; color: #b7c3be; font-size: 14px; font-weight: 620; }
.status-line span { width: 8px; height: 8px; flex: 0 0 auto; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px rgba(124, 224, 141, 0.1), 0 0 14px rgba(124, 224, 141, 0.7); }
.hero h1 { max-width: 820px; margin: 22px 0 0; color: var(--text); font-size: 64px; font-weight: 760; line-height: 1.08; letter-spacing: 0; }
.hero h1 strong { display: block; margin-bottom: 10px; color: var(--mint); font-size: 18px; font-weight: 760; }
.hero-description { max-width: 700px; margin: 26px 0 0; color: #bac6c1; font-size: 18px; line-height: 1.8; }
.hero-description-secondary { max-width: 720px; margin: 10px 0 0; color: #8fa09a; font-size: 16px; }
.hero-actions { display: flex; margin-top: 34px; align-items: center; gap: 12px; }
.hero-facts { display: flex; margin: 46px 0 0; padding: 0; list-style: none; gap: 0; }
.hero-facts li { display: flex; min-width: 180px; padding: 0 28px; border-left: 1px solid #34413e; flex-direction: column; }
.hero-facts li:first-child { padding-left: 0; border-left: 0; }
.hero-facts strong { color: var(--text); font-size: 21px; font-weight: 720; white-space: nowrap; }
.hero-facts span { margin-top: 2px; color: #84928d; font-size: 13px; }

.model-rail { position: relative; z-index: 3; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--text); background: var(--ink-soft); }
.rail-content { display: flex; min-height: 88px; align-items: center; justify-content: space-between; gap: 30px; }
.rail-content > span { color: #74827d; font-size: 13px; font-weight: 680; white-space: nowrap; }
.rail-content ul { display: flex; margin: 0; padding: 0; align-items: center; justify-content: flex-end; flex-wrap: wrap; list-style: none; gap: 18px 34px; }
.rail-content li { display: inline-flex; align-items: center; gap: 8px; color: #c0cbc7; font-size: 14px; font-weight: 650; }
.rail-content li img { width: 19px; height: 19px; object-fit: contain; }
.rail-content li:first-child img { filter: invert(1); }
.rail-content .logo-grok { filter: invert(1); }

/* Shared section rules */
.section { padding: 104px 0; }
.section-light { color: var(--text-dark); background: var(--paper); }
.section-neutral { color: var(--text-dark); background: var(--paper-warm); }
.section-dark { color: var(--text); background: var(--ink-soft); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 64px; }
.centered-heading { display: block; max-width: 760px; margin: 0 auto; text-align: center; }
.eyebrow { margin: 0 0 10px; color: var(--mint-strong); font-size: 13px; font-weight: 760; letter-spacing: 0; }
.section-dark .eyebrow, .quickstart .eyebrow { color: var(--mint); }
.section-heading h2, .advantages-intro h2, .quickstart-copy h2, .faq-layout h2, .cta-layout h2 { max-width: 720px; margin: 0; font-size: 42px; font-weight: 740; line-height: 1.2; letter-spacing: 0; }
.section-heading > p, .centered-heading > p:last-child { max-width: 520px; margin: 0; color: var(--muted-dark); line-height: 1.8; }
.centered-heading > p:last-child { margin: 18px auto 0; }

/* Models */
.flagship-model { position: relative; display: grid; margin-top: 52px; padding: 34px; overflow: hidden; border: 1px solid #3e7468; border-radius: 8px; align-items: center; grid-template-columns: 1fr 1.2fr auto; gap: 34px; background-color: #17302a; background-image: linear-gradient(rgba(124, 230, 207, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(124, 230, 207, 0.035) 1px, transparent 1px); background-size: 32px 32px; box-shadow: inset 0 1px rgba(255, 255, 255, 0.03), 0 22px 60px rgba(0, 0, 0, 0.14); }
.flagship-model::after { content: "GPT"; position: absolute; right: 24px; bottom: -34px; color: rgba(124, 230, 207, 0.055); font-size: 108px; font-weight: 800; line-height: 1; pointer-events: none; }
.flagship-model > * { position: relative; z-index: 1; }
.model-label { display: flex; margin: 0 0 10px; align-items: center; gap: 8px; color: #7ce6cf; font-size: 12px; font-weight: 720; }
.model-label span { width: 7px; height: 7px; border-radius: 50%; background: var(--mint-strong); }
.flagship-model h3 { display: inline; margin: 0; font-size: 34px; }
.flagship-model code { display: inline-block; margin-left: 12px; padding: 4px 8px; border-radius: 4px; color: #9ee8d8; background: #25443d; font-size: 12px; }
.flagship-model > p { margin: 0; color: #b7c5c0; }
.flagship-model > a, .text-action { display: inline-flex; min-height: 44px; align-items: center; gap: 8px; color: var(--mint); font-size: 14px; font-weight: 720; text-decoration: none; white-space: nowrap; }
.flagship-model > a:hover, .text-action:hover { color: #8cf0dc; }
.model-groups { display: grid; margin-top: 44px; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 44px; }
.group-title { display: flex; margin-bottom: 16px; align-items: center; gap: 10px; }
.group-title h3 { margin: 0; font-size: 16px; }
.group-dot { width: 8px; height: 8px; border-radius: 50%; }
.global-dot { background: var(--blue); }
.cn-dot { background: var(--amber); }
.model-list { display: grid; margin: 0; padding: 0; list-style: none; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.model-list li { display: flex; min-height: 84px; padding: 16px; border: 1px solid var(--line-light); border-radius: 8px; align-items: center; gap: 12px; background: #1b2522; transition: transform 180ms ease, border-color 180ms ease, background 180ms ease; }
.model-list li:hover { border-color: #4f655f; background: #202d29; transform: translateY(-3px); }
.model-symbol { display: grid; width: 38px; height: 38px; flex: 0 0 auto; border: 1px solid rgba(255, 255, 255, 0.08); border-radius: 6px; place-items: center; background: #111a18; }
.model-symbol img { width: 25px; height: 25px; object-fit: contain; }
.symbol-openai { color: #111715; background: #f0f4f2; }
.symbol-claude { background: #2d211c; }
.symbol-grok { background: #f0f4f2; }
.symbol-glm { background: #18264a; }
.symbol-deepseek { background: #182446; }
.symbol-qwen { background: #251d43; }
.model-list strong, .model-list small { display: block; }
.model-list strong { font-size: 14px; }
.model-list small { margin-top: 2px; color: var(--muted-dark); font-size: 11px; }

/* Advantages */
.advantages-layout { display: grid; align-items: start; grid-template-columns: 0.9fr 1.1fr; gap: 76px; }
.advantages-intro { position: sticky; top: 112px; }
.advantages-intro h2 { max-width: 560px; font-size: 44px; }
.advantages-intro .advantage-thesis { max-width: 540px; margin: 22px 0 0; color: var(--muted); line-height: 1.85; }
.quality-formula { display: grid; max-width: 560px; margin-top: 28px; padding: 18px 0; border-top: 1px solid #33413e; border-bottom: 1px solid #33413e; align-items: center; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 12px; }
.quality-formula span { display: flex; min-width: 0; flex-direction: column; }
.quality-formula small, .advantage-list div > small { color: #6f827b; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 9px; font-weight: 700; }
.quality-formula strong { margin-top: 2px; color: #e6eeeb; font-size: 14px; }
.quality-formula i { color: var(--amber); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 16px; font-style: normal; }
.advantages-intro .advantage-summary { max-width: 540px; margin: 22px 0 0; color: #d8e3df; font-size: 17px; font-weight: 680; line-height: 1.7; }
.advantage-list { margin: 0; padding: 0; list-style: none; }
.advantage-list li { position: relative; display: grid; min-height: 174px; padding: 34px 18px; border-top: 1px solid var(--line); grid-template-columns: 64px 1fr; gap: 18px; transition: background 180ms ease, border-color 180ms ease; }
.advantage-list li::before { content: ""; position: absolute; top: 34px; bottom: 34px; left: 0; width: 2px; background: transparent; transition: background 180ms ease; }
.advantage-list li:hover { border-color: #40514c; background: rgba(255, 255, 255, 0.02); }
.advantage-list li:hover::before { background: var(--mint); }
.advantage-list li:last-child { border-bottom: 1px solid var(--line); }
.advantage-list > li > span { color: var(--amber); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 14px; }
.advantage-list h3 { margin: 5px 0 0; font-size: 22px; }
.advantage-list p { max-width: 520px; margin: 10px 0 0; color: var(--muted); }

/* Use cases */
.scenario-grid { display: grid; margin-top: 48px; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.scenario-grid article { min-height: 230px; padding: 28px; border: 1px solid #36413d; border-radius: 8px; background: #1e2825; transition: transform 180ms ease, border-color 180ms ease, background 180ms ease; }
.scenario-grid article:hover { border-color: #53645f; background: #222f2b; transform: translateY(-4px); }
.scenario-grid article > span { display: inline-flex; min-height: 28px; padding: 0 8px; border-radius: 4px; align-items: center; color: #b8c6c1; background: #2b3733; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 11px; font-weight: 720; }
.scenario-grid article:nth-child(2) > span, .scenario-grid article:nth-child(5) > span { color: #ffd18a; background: #44351f; }
.scenario-grid article:nth-child(3) > span, .scenario-grid article:nth-child(6) > span { color: #b3c9ff; background: #27354f; }
.scenario-grid h3 { margin: 56px 0 10px; font-size: 20px; }
.scenario-grid p { margin: 0; color: var(--muted-dark); }

/* Quickstart */
.quickstart { color: var(--text); background: #101817; }
.quickstart-layout { display: grid; align-items: center; grid-template-columns: 0.78fr 1.22fr; gap: 80px; }
.quickstart-copy p:not(.eyebrow) { max-width: 500px; margin: 22px 0 0; color: var(--muted); }
.quickstart-copy .text-action { margin-top: 20px; color: var(--mint); }
.code-tool { overflow: hidden; border: 1px solid #3b4b47; border-radius: 8px; background: #080d0c; box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28); }
.code-toolbar { display: flex; min-height: 50px; padding: 0 18px; border-bottom: 1px solid #2b3835; align-items: center; justify-content: space-between; color: #8d9b96; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 12px; }
.code-toolbar button { min-width: 82px; min-height: 34px; padding: 0 10px; border: 1px solid #3b4b47; border-radius: 5px; color: #d9e2de; background: #111a18; cursor: pointer; }
.code-toolbar button:hover { border-color: var(--mint); color: var(--mint); }
.code-tool pre { margin: 0; padding: 28px; overflow-x: auto; color: #d6dfdc; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 13px; line-height: 1.85; }
.code-tool b { color: var(--mint); }
.code-tool i { color: #93b6f4; font-style: normal; }
.code-status { display: flex; min-height: 46px; padding: 0 28px; border-top: 1px solid #2b3835; align-items: center; gap: 9px; color: #9cc5bb; font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 12px; }
.code-status span { width: 7px; height: 7px; border-radius: 50%; background: var(--green); }

/* FAQ and CTA */
.faq-layout { display: grid; align-items: start; grid-template-columns: 0.72fr 1.28fr; gap: 90px; }
.faq-layout > div:first-child > p:last-child { max-width: 400px; margin: 20px 0 0; color: var(--muted-dark); }
.faq-list { border-top: 1px solid var(--line-light); }
.faq-list details { border-bottom: 1px solid var(--line-light); }
.faq-list summary { position: relative; display: flex; min-height: 72px; padding: 18px 44px 18px 0; align-items: center; font-size: 17px; font-weight: 680; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 4px; color: var(--mint-strong); font-size: 24px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -4px 0 22px; padding-right: 50px; color: var(--muted-dark); }
.final-cta { padding: 78px 0; color: var(--ink); background-color: var(--mint); background-image: linear-gradient(rgba(10, 15, 14, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(10, 15, 14, 0.06) 1px, transparent 1px); background-size: 48px 48px; }
.cta-layout { display: flex; align-items: center; justify-content: space-between; gap: 64px; }
.cta-layout .eyebrow { color: #146a58; }
.cta-layout h2 { max-width: 690px; font-size: 38px; }
.cta-copy { max-width: 620px; margin: 14px 0 0; color: #174b40; font-weight: 560; }
.cta-actions { display: flex; flex: 0 0 auto; gap: 10px; }

/* Footer */
.site-footer { padding: 64px 0 36px; color: var(--text); background: var(--ink); }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(4, 1fr); gap: 42px; }
.footer-brand p { max-width: 280px; margin: 16px 0 0; color: #84928d; font-size: 13px; }
.footer-grid h2 { margin: 8px 0 16px; color: #dce4e1; font-size: 13px; }
.footer-grid > div:not(.footer-brand) > a, .footer-grid > div:not(.footer-brand) > span { display: block; min-height: 34px; color: #87958f; font-size: 13px; text-decoration: none; }
.footer-grid .copyright { display: inline-flex !important; align-items: baseline; gap: 3px; white-space: nowrap; }
.footer-grid > div:not(.footer-brand) a:hover { color: var(--mint); }

a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--mint-strong); outline-offset: 4px; }
@keyframes hero-enter { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes signal-travel { 0%, 100% { left: 2%; opacity: 0.25; } 50% { left: calc(100% - 7px); opacity: 1; } }
@keyframes packet-ping { 0% { opacity: 0.8; transform: scale(0.45); } 75%, 100% { opacity: 0; transform: scale(1.35); } }
@keyframes scene-scan { 0%, 100% { opacity: 0; transform: translateX(0); } 12% { opacity: 1; } 50% { opacity: 0.65; transform: translateX(42vw); } 88% { opacity: 0; } }
@keyframes node-flow { 0%, 100% { opacity: 0.68; transform: translateY(0); box-shadow: none; } 28% { opacity: 1; transform: translateY(-2px); box-shadow: -10px 0 24px rgba(82, 223, 195, 0.08); } 52% { opacity: 0.76; transform: translateY(0); box-shadow: none; } }

@media (max-width: 1024px) {
  .desktop-nav { gap: 18px; }
  .hero h1 { font-size: 54px; }
  .hero-scene { opacity: 0.46; }
  .scene-node, .scene-label, .hero-scene::after { display: none; }
  .model-list { grid-template-columns: 1fr; }
  .advantages-layout, .quickstart-layout, .faq-layout { gap: 56px; }
  .footer-grid { grid-template-columns: 1.4fr repeat(2, 1fr); }
}

@media (max-width: 800px) {
  .section-shell, .nav-shell { width: min(calc(100% - 36px), var(--max-width)); }
  .desktop-nav, .nav-actions > .text-link { display: none; }
  .menu-button { display: flex; }
  .hero { min-height: calc(100svh - 112px); max-height: none; }
  .hero-content { padding: 64px 0; }
  .hero h1 { font-size: 48px; }
  .hero-description { max-width: 600px; font-size: 17px; }
  .hero-description-secondary { font-size: 15px; }
  .hero-facts li { min-width: 0; flex: 1; }
  .rail-content { padding: 20px 0; align-items: flex-start; flex-direction: column; gap: 12px; }
  .rail-content ul { justify-content: flex-start; }
  .section { padding: 78px 0; }
  .section-heading, .cta-layout { align-items: flex-start; flex-direction: column; gap: 22px; }
  .section-heading h2, .advantages-intro h2, .quickstart-copy h2, .faq-layout h2, .cta-layout h2 { font-size: 36px; }
  .flagship-model { grid-template-columns: 1fr; gap: 20px; }
  .model-groups, .advantages-layout, .quickstart-layout, .faq-layout { grid-template-columns: 1fr; }
  .advantages-intro { position: static; }
  .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .section-shell, .nav-shell { width: min(calc(100% - 28px), var(--max-width)); }
  .nav-shell { height: 64px; }
  .brand { font-size: 18px; }
  .brand img { width: 34px; height: 34px; }
  .nav-actions > .button { display: none; }
  .mobile-menu { inset: 65px 0 auto; height: calc(100svh - 65px); }
  .hero { min-height: auto; }
  .hero::before { left: 20px; box-shadow: 160px 0 rgba(255, 255, 255, 0.035), 320px 0 rgba(255, 255, 255, 0.035); }
  .hero-content { padding: 40px 0 30px; text-align: left; }
  .status-line { justify-content: flex-start; }
  .hero h1 { font-size: 39px; }
  .hero h1, .hero-description, .hero-description-secondary { margin-right: 0; margin-left: 0; }
  .hero h1 strong { font-size: 16px; }
  .hero-description { margin-top: 20px; font-size: 16px; line-height: 1.72; }
  .hero-description-secondary { margin-top: 10px; font-size: 14px; }
  .hero-actions { margin-top: 26px; align-items: stretch; justify-content: flex-start; }
  .hero-actions .button { min-width: 0; padding: 0 12px; flex: 1; font-size: 14px; }
  .hero-facts { margin-top: 28px; justify-content: flex-start; flex-wrap: wrap; gap: 16px 0; }
  .hero-facts li { min-width: 50%; padding: 0 14px; }
  .hero-facts li:nth-child(3) { padding-left: 0; border-left: 0; }
  .hero-facts strong { font-size: 20px; }
  .rail-content ul { gap: 10px 20px; }
  .section { padding: 64px 0; }
  .section-heading h2, .advantages-intro h2, .quickstart-copy h2, .faq-layout h2, .cta-layout h2 { font-size: 30px; }
  .flagship-model { margin-top: 36px; padding: 24px; }
  .flagship-model h3 { font-size: 28px; }
  .model-groups { gap: 32px; }
  .model-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .model-list li { min-height: 96px; align-items: flex-start; flex-direction: column; }
  .advantage-list li { min-height: 0; grid-template-columns: 48px 1fr; }
  .quality-formula { grid-template-columns: 1fr auto 1fr auto 1fr; gap: 6px; }
  .quality-formula strong { font-size: 13px; }
  .scenario-grid { grid-template-columns: 1fr; }
  .scenario-grid article { min-height: 200px; }
  .scenario-grid h3 { margin-top: 40px; }
  .code-tool pre { padding: 22px 18px; font-size: 11px; }
  .code-status { padding: 0 18px; }
  .cta-actions { width: 100%; align-items: stretch; flex-direction: column; }
  .cta-actions .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* Standalone 404 page */
.not-found { display: flex; min-height: 100svh; padding: 48px 24px; align-items: center; justify-content: center; flex-direction: column; color: var(--text); background: var(--ink); text-align: center; }
.not-found > p { margin: 56px 0 0; color: var(--mint); font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-size: 18px; }
.not-found h1 { margin: 8px 0 28px; font-size: 42px; letter-spacing: 0; }