/* Landing-page composition; colors and type come from theme.css. */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body { margin: 0; background: var(--ground); color: var(--text); font-family: var(--font); line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.035em; }
button { cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
.wrap { width: min(1232px, 100%); margin-inline: auto; padding-inline: 36px; }
.eyebrow, .small-label { font: 11px/1.5 var(--mono); letter-spacing: .12em; color: var(--green); }
.hero { display: grid; grid-template-columns: 1.12fr 1fr; align-items: center; gap: 64px; padding-top: 98px; padding-bottom: 92px; }
.hero .eyebrow { margin-bottom: 24px; }
h1 { font-size: clamp(48px, 5.4vw, 76px); font-weight: 650; letter-spacing: -.055em; line-height: 1.04; }
h1 em { color: var(--green); font-style: normal; }
.hero-lede { font-size: 17px; max-width: 48ch; color: var(--text-body); margin-top: 30px; line-height: 1.8; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 18px; border-radius: 9px; padding: 12px 18px; font-size: 13px; font-weight: 650; border: 1px solid var(--border-strong); transition: background .18s, border-color .18s; }
.button.primary { color: var(--ground); background: var(--green); border-color: var(--green); }
.button.primary:hover { background: #92f0cb; }
.button.secondary:hover { background: var(--surface-2); border-color: var(--green); }
.hero-note { margin-top: 22px; color: var(--text-mid); font: 11px/1.6 var(--mono); }
.run-anatomy { position: relative; min-width: 0; border: 1px solid var(--border-strong); border-radius: 18px; background: var(--surface); box-shadow: 0 28px 70px #0003; }
.anatomy-bar { display: flex; gap: 12px; align-items: center; padding: 18px 24px; border-bottom: 1px solid var(--border); }
.anatomy-mark { font-size: 27px; color: var(--green); line-height: 1; }
.anatomy-bar h2 { font-size: 14px; letter-spacing: -.01em; font-weight: 600; }
.anatomy-type { margin-left: auto; font: 9px var(--mono); color: var(--text-mid); }
.anatomy-content { padding: 26px; }
.anatomy-content h3 { font-size: 22px; line-height: 1.3; font-weight: 550; margin-top: 9px; letter-spacing: -.025em; }
.anatomy-content p { font-size: 12px; color: var(--text-mid); margin-top: 8px; }
.anatomy-anchor { padding-left: 17px; border-left: 2px solid var(--border-strong); }
.anatomy-anchor .small-label { color: var(--text-mid); font-size: 9px; }
.anatomy-file { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-top: 25px; padding: 14px 16px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 9px; font-size: 12px; }
.anatomy-file div > span { color: var(--green); margin-right: 7px; }
.anatomy-file .tag { margin-left: auto; font: 9px var(--mono); color: var(--green); border: 1px solid #63e6b530; padding: 3px 6px; border-radius: 4px; }
.anatomy-file p { width: 100%; margin-top: 0; }
.anatomy-cycle { display: flex; justify-content: space-between; align-items: center; position: relative; padding: 30px 20px 39px; font: 12px var(--mono); color: var(--text-body); }
.anatomy-cycle b { color: var(--text-mid); font-weight: 400; }
.cycle-return { position: absolute; right: 6px; bottom: 4px; color: var(--green); font-size: 28px; }
.anatomy-evidence { border: 1px solid #63e6b533; background: #163327; padding: 20px; border-radius: 10px; }
.anatomy-evidence .small-label { font-size: 9px; }
.anatomy-evidence h3 { color: var(--text); }
.anatomy-evidence p { color: var(--text-body); font-family: var(--mono); font-size: 11px; margin-top: 14px; }
.anatomy-footer { border-top: 1px solid var(--border); padding: 12px 24px; font: 10px/1.5 var(--mono); color: var(--text-mid); }
.foundation-strip { display: flex; align-items: center; justify-content: space-between; gap: 20px; border-block: 1px solid var(--border); padding-block: 22px; font-size: 12px; color: var(--text-mid); }
.foundation-strip div { display: flex; gap: 20px; color: var(--text-body); font-size: 11px; }
code { font-family: var(--mono); }
.section { padding-block: 86px; scroll-margin-top: 66px; }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 72px; margin-bottom: 38px; }
.section-heading .eyebrow { margin-bottom: 16px; }
.section-heading h2 { font-size: clamp(30px, 3.3vw, 44px); font-weight: 550; line-height: 1.14; }
.section-heading > p { font-size: 15px; color: var(--text-body); max-width: 52ch; line-height: 1.8; }
.feature-grid, .example-grid, .record-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.feature-card { padding: 27px 25px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; display: flex; flex-direction: column; align-items: flex-start; }
.card-number { color: var(--green); font: 13px var(--mono); margin-bottom: 30px; }
.feature-card h3, .example-card h3 { font-size: 21px; line-height: 1.3; font-weight: 550; margin-bottom: 13px; }
.feature-card p, .example-card p, .detail-card p, .record-card p { color: var(--text-body); font-size: 14px; line-height: 1.8; }
.text-link { font-size: 12px; color: var(--green); display: inline-flex; align-items: center; gap: 12px; border-bottom: 1px solid transparent; }
.text-link:hover { border-bottom-color: var(--green); }
.feature-card .text-link, .example-card .text-link { margin-top: auto; padding-top: 26px; }
.evolution-section { background: var(--surface); border-block: 1px solid var(--border); }
.two-loops { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.two-loops article { border-top: 2px solid var(--green); padding-top: 24px; }
.two-loops .system-loop { border-top-color: var(--amber); }
.system-loop .small-label { color: var(--amber); }
.two-loops h3 { font-size: 25px; font-weight: 550; margin-top: 15px; line-height: 1.3; }
.two-loops p { font-size: 14px; color: var(--text-body); line-height: 1.85; margin-top: 15px; }
.loop-words { padding: 19px 0; margin-top: 14px; font: 12px/1.8 var(--mono); color: var(--text); }
.loop-words b { color: var(--green); margin-inline: 8px; }
.system-loop .loop-words b { color: var(--amber); }
.evidence-note { border-top: 1px solid var(--border); margin-top: 12px; padding-top: 20px; color: var(--text-mid); font-size: 12px; }
.architecture-figure { margin: 0; }
.architecture-figure img { display: block; width: 100%; height: auto; border: 1px solid var(--border-strong); border-radius: 14px; }
.architecture-figure a { display: block; border-radius: 14px; }
figcaption { margin-top: 14px; color: var(--text-mid); font-size: 12px; }
.diagram-downloads { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 15px; font-size: 13px; color: var(--green); }
.diagram-downloads a:hover { text-decoration: underline; text-underline-offset: 5px; }
.underhood { border-top: 1px solid var(--border); }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.detail-card { padding: 28px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.detail-card h3 { font-size: 24px; line-height: 1.3; font-weight: 550; margin-top: 17px; margin-bottom: 14px; }
.detail-card p code { color: var(--green); font-size: 12px; overflow-wrap: anywhere; }
.file-tree { margin: 24px 0 0; padding: 16px; background: var(--ground); border-radius: 8px; font-size: 13px; line-height: 1.8; overflow-x: auto; }
.file-tree span { color: var(--text-mid); }
.layer-strip { display: flex; gap: 5px; margin-top: 27px; font: 10px var(--mono); }
.layer-strip span { padding: 13px 9px; border: 1px solid var(--border-strong); border-radius: 5px; background: var(--surface-2); }
.layer-strip span:last-child { border-color: #63e6b560; color: var(--green); }
.capability-row { display: flex; gap: 24px; align-items: center; border-top: 1px solid var(--border); margin-top: 28px; padding-top: 25px; }
.capability-row p { font-size: 12px; color: var(--text-mid); flex-shrink: 0; }
.capability-row > div { display: flex; gap: 9px; flex-wrap: wrap; }
.capability-row span { font: 11px var(--mono); padding: 5px 8px; border: 1px solid var(--border); border-radius: 5px; }
.examples-section { background: var(--surface); border-block: 1px solid var(--border); }
.example-card { display: flex; flex-direction: column; align-items: flex-start; padding: 0 25px 0 0; border-right: 1px solid var(--border-strong); }
.example-card:last-child { border-right: 0; padding-right: 0; }
.example-card .small-label { font-size: 10px; font-family: var(--mono); color: var(--green); margin-bottom: 24px; }
.record-grid { gap: 0; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.record-card { position: relative; padding: 28px; background: var(--surface); border-right: 1px solid var(--border); transition: background .18s; }
.record-card:last-child { border: 0; }
.record-card:hover { background: var(--surface-2); }
.record-card h3 { font-size: 21px; line-height: 1.3; margin: 26px 0 15px; font-weight: 550; }
.record-arrow { color: var(--green); font-size: 22px; }
.boundary-row { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 35px; }
.boundary-row h3 { font-size: 16px; font-weight: 550; margin-bottom: 12px; }
.boundary-row p { color: var(--text-mid); font-size: 13px; line-height: 1.8; }
.start-section { background: linear-gradient(130deg, #112b20, var(--surface) 70%); border-block: 1px solid var(--border); }
.start-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; align-items: start; }
.start-instructions ol { padding-left: 20px; margin: 0; }
.start-instructions li { padding-left: 6px; margin-bottom: 22px; }
.start-instructions li::marker { color: var(--green); font-family: var(--mono); font-size: 12px; }
.start-instructions h3 { font-size: 17px; font-weight: 550; margin-bottom: 12px; }
.start-instructions p { font-size: 13px; color: var(--text-body); }
pre { font-size: 11px; line-height: 1.95; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--text-body); }
.command-box { border: 1px solid var(--border-strong); border-radius: 12px; background: var(--ground); overflow: hidden; min-width: 0; }
.command-top { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.copy-command { color: var(--text-body); background: var(--surface-2); border: 1px solid var(--border-strong); border-radius: 5px; font-size: 11px; padding: 5px 9px; }
.copy-command:hover { color: var(--green); }
.command-tabs { display: flex; gap: 18px; padding: 8px 20px 0; border-bottom: 1px solid var(--border); }
.command-tabs button { padding: 9px 0 13px; font-size: 12px; color: var(--text-mid); background: none; border: 0; border-bottom: 2px solid transparent; }
.command-tabs button[aria-selected=true] { color: var(--green); border-bottom-color: var(--green); }
.command-box [role=tabpanel] { padding: 15px 20px 0; }
.command-box [role=tabpanel] pre { margin: 5px 0 20px; min-height: 116px; color: var(--text); }
.command-note { font-size: 12px; color: var(--text-mid); min-height: 65px; }
.command-note a { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }
.copy-status { font-size: 11px; color: var(--green); min-height: 39px; padding: 8px 20px; }
.doc-links { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--border-strong); }
.doc-links a { padding: 24px 14px; display: flex; justify-content: space-between; gap: 16px; font-size: 15px; border-right: 1px solid var(--border); }
.doc-links a:last-child { border-right: 0; }
.doc-links a:hover { background: var(--surface); color: var(--green); }
.doc-links a span:last-child { color: var(--green); }
.closing-note { margin-top: 25px; color: var(--text-mid); font-size: 12px; }
[hidden] { display: none !important; }
html[lang=zh-CN] h1 { line-height: 1.18; font-size: clamp(48px, 5.2vw, 72px); letter-spacing: -.035em; }
html[lang=zh-CN] .hero-lede { max-width: 31em; }
@media (min-width:1500px) { .hero { padding-top: 110px; padding-bottom: 105px; } }
@media (max-width:1050px) { .hero { gap: 32px; padding-top: 65px; } h1 { font-size: 58px; } .section-heading { gap: 38px; } .anatomy-type { display: none; } .foundation-strip { align-items: flex-start; flex-direction: column; } .capability-row { align-items: flex-start; flex-direction: column; gap: 14px; } }
@media (max-width:800px) { .wrap { padding-inline: 24px; } .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 55px; padding-bottom: 50px; } .hero-copy { max-width: 600px; } .hero-lede { max-width: 58ch; } .run-anatomy { max-width: 530px; width: 100%; } h1 { font-size: 65px; } .section { padding-block: 58px; } .section-heading { grid-template-columns: 1fr; gap: 18px; margin-bottom: 28px; } .section-heading > p { max-width: 64ch; } .feature-grid { grid-template-columns: 1fr; } .feature-card { padding: 24px; } .card-number { margin-bottom: 16px; } .two-loops, .detail-grid, .boundary-row, .start-grid { grid-template-columns: 1fr; } .example-grid { grid-template-columns: 1fr; gap: 24px; } .example-card { border-right: 0; border-bottom: 1px solid var(--border-strong); padding: 0 0 24px; } .example-card:last-child { border: 0; } .record-grid { grid-template-columns: 1fr; } .record-card { border-right: 0; border-bottom: 1px solid var(--border); } .record-card h3 { margin-top: 12px; } .doc-links { grid-template-columns: 1fr 1fr; } .doc-links a:nth-child(2) { border-right: 0; } .doc-links a:nth-child(-n+2) { border-bottom: 1px solid var(--border); } .two-loops h3 { font-size: 24px; } }
@media (max-width:430px) { .wrap { padding-inline: 20px; } h1 { font-size: 52px; } .hero .eyebrow { font-size: 10px; } .hero-lede { font-size: 15px; } .hero-actions { gap: 8px; } .button { padding: 11px 12px; font-size: 12px; gap: 10px; } .hero-note { font-size: 10px; } .anatomy-content { padding: 20px; } .anatomy-bar { padding-inline: 20px; } .foundation-strip div { flex-wrap: wrap; gap: 15px; } .section-heading h2 { font-size: 32px; } .detail-card { padding: 22px; } .layer-strip { flex-wrap: wrap; } .loop-words b { margin-inline: 3px; } .diagram-downloads { gap: 15px; font-size: 12px; } .doc-links a { font-size: 13px; } }

/* The overview and eight-entity explorer share the workbench's restrained geometry. */
.hero { grid-template-columns: 1.05fr 1fr; gap: 58px; padding-block: 80px; }
h1 { font-size: clamp(46px, 5vw, 70px); }
html[lang=zh-CN] h1 { font-size: clamp(36px, 4.2vw, 58px); line-height: 1.3; }
.system-scene { min-width: 0; border: 1px solid var(--border-strong); border-radius: 18px; background: linear-gradient(150deg, #13291f, var(--surface) 60%); box-shadow: 0 24px 70px #0002; padding: 22px; }
.scene-heading { display: flex; align-items: center; gap: 9px; font-size: 13px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.scene-orbit { color: var(--green); font-size: 25px; line-height: 1; }
.scene-label { margin-left: auto; color: var(--text-mid); font: 9px var(--mono); letter-spacing: .05em; }
.scene-task { text-align: center; padding: 22px 12px 0; }
.scene-task h3 { font-size: 19px; font-weight: 550; margin-top: 8px; }
.scene-task .small-label { color: var(--text-mid); font-size: 9px; }
.scene-stem { height: 25px; width: 1px; background: var(--border-strong); margin-inline: auto; }
.scene-foundations { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 7px; }
.scene-foundations a { text-align: center; padding: 13px 4px; border: 1px solid var(--border-strong); border-radius: 7px; background: var(--surface); }
.scene-foundations a:hover { border-color: var(--green); }
.scene-foundations span { font-size: 13px; font-weight: 550; }
.scene-foundations small { display: block; color: var(--text-mid); margin-top: 4px; font-size: 10px; }
.scene-evolution { display: block; background: #173629; border: 1px solid #63e6b555; border-radius: 10px; padding: 18px; }
.scene-evolution:hover { border-color: var(--green); }
.scene-evolution > div:first-child { display: flex; gap: 16px; align-items: center; }
.scene-eight { color: var(--green); font: 48px/1 var(--mono); letter-spacing: -.1em; padding-right: 4px; }
.scene-evolution h3 { font-size: 16px; font-weight: 550; letter-spacing: -.02em; }
.scene-evolution p { font-size: 11px; color: var(--text-body); margin-top: 5px; }
.scene-chips { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 5px; margin-top: 16px; }
.scene-chips span { font: 9px/1.4 var(--mono); text-align: center; color: var(--text-body); padding: 5px 2px; border-radius: 4px; background: #07100e55; }
.scene-proof { display: flex; justify-content: space-between; align-items: center; padding: 12px; font-size: 11px; background: var(--surface); border: 1px solid var(--border); border-radius: 7px; }
.scene-proof > span:last-child { font-size: 20px; color: var(--amber); }
.scene-footer { text-align: center; color: var(--text-mid); font: 10px/1.7 var(--mono); margin-top: 16px; }
.foundation-strip a { white-space: nowrap; }
.foundation-strip a:hover { color: var(--green); }
.foundation-strip a span { color: var(--green); margin-left: 4px; }
.entity-tabs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.entity-tab { display: grid; grid-template-columns: 1fr auto; gap: 6px; text-align: left; padding: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: 9px; color: var(--text); font: inherit; transition: border-color .15s, background .15s; min-width: 0; }
.entity-tab strong { grid-column: 1; grid-row: 1; font-size: 16px; font-weight: 550; }
.entity-number { grid-column: 2; grid-row: 1; color: var(--text-mid); font: 10px var(--mono); align-self: center; }
.entity-tab small { grid-column: 1 / -1; color: var(--text-mid); font-size: 11px; }
.entity-tab:hover { border-color: var(--border-strong); background: var(--surface-2); }
.entity-tab[aria-selected=true] { border-color: var(--green); background: #153328; }
.entity-tab[aria-selected=true] strong, .entity-tab[aria-selected=true] .entity-number { color: var(--green); }
.entity-panels { margin-top: 16px; border: 1px solid var(--border-strong); border-radius: 12px; background: var(--surface); }
.entity-panel { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; padding: 28px; min-height: 175px; }
.entity-panel h3 { font-size: 20px; line-height: 1.5; font-weight: 500; margin-top: 12px; letter-spacing: -.02em; }
.entity-panel > div:last-child { border-left: 1px solid var(--border); padding-left: 28px; }
.entity-panel > div:last-child > p:not(.small-label) { color: var(--text-body); font-size: 13px; margin: 10px 0 12px; }
.entity-panel .small-label { font-size: 10px; }
.section-note { color: var(--text-mid); font-size: 12px; line-height: 1.75; margin-top: 16px; }
.mechanism-section, .workbench-section, .engineering-section { background: var(--surface); border-block: 1px solid var(--border); }
.runtime-feature { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; padding: 32px; background: var(--ground); border: 1px solid var(--border-strong); border-radius: 12px; margin-bottom: 22px; scroll-margin-top: 95px; }
.runtime-feature h3 { font-size: 30px; font-weight: 550; line-height: 1.3; margin: 15px 0; }
.runtime-feature p:not(.small-label) { color: var(--text-body); font-size: 14px; line-height: 1.8; }
.runtime-feature .text-link { margin-top: 20px; }
.runtime-diagram { min-width: 0; }
.runtime-root { display: flex; align-items: center; gap: 9px; padding: 16px; border: 1px solid #63e6b555; border-radius: 8px; background: #153328; font-size: 13px; }
.runtime-root > span:last-child { margin-left: auto; color: var(--green); font: 10px var(--mono); }
.diagram-dot { width: 7px; height: 7px; background: var(--green); border-radius: 50%; }
.runtime-branches { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; padding-top: 30px; }
.runtime-branches > div { position: relative; text-align: center; padding: 17px 4px; border: 1px solid var(--border-strong); border-radius: 7px; background: var(--surface); }
.runtime-branches > div::before { position: absolute; content: ''; left: 50%; top: -31px; width: 1px; height: 30px; background: var(--border-strong); }
.runtime-branches span { font: 12px var(--mono); }
.runtime-branches small { display: block; color: var(--text-mid); font-size: 10px; margin-top: 7px; }
.runtime-controls { border-top: 1px solid var(--border); margin-top: 20px; padding-top: 16px; color: var(--text-mid); font-size: 11px; text-align: center; line-height: 1.9; }
.detail-card { background: var(--ground); scroll-margin-top: 95px; }
.plan-preview { margin-top: 22px; display: grid; gap: 8px; }
.plan-preview div { display: flex; align-items: center; gap: 10px; font-size: 12px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); }
.plan-preview div > span:first-child { color: var(--green); }
.context-stack { display: grid; gap: 6px; margin-top: 22px; }
.context-stack > div { display: grid; grid-template-columns: 100px 1fr; padding: 10px 12px; border: 1px solid var(--border); border-radius: 5px; color: var(--text-mid); font-size: 11px; }
.context-stack code { color: var(--text-body); font-size: 11px; }
.context-stack > div:last-child { border-color: #63e6b544; background: #153328; }
.context-stack > div:last-child code { color: var(--green); }
.evidence-flow { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 20px; list-style: none; padding: 0; margin: 0; }
.evidence-flow li { border-top: 1px solid var(--border-strong); padding-top: 18px; }
.evidence-number { font: 12px var(--mono); color: var(--green); }
.evidence-flow h3 { font-size: 18px; font-weight: 550; margin: 14px 0 10px; }
.evidence-flow p { color: var(--text-body); font-size: 13px; }
.evidence-caption { display: grid; grid-template-columns: 1.5fr 1fr; gap: 32px; margin-top: 32px; border-top: 1px solid var(--border); padding-top: 20px; font-size: 12px; color: var(--text-mid); }
.evidence-caption p:last-child { color: var(--amber); }
.workbench-shot { display: block; overflow: hidden; border: 1px solid var(--border-strong); border-radius: 12px; background: var(--ground); box-shadow: 0 24px 50px #0002; }
.workbench-shot-bar { display: flex; gap: 20px; justify-content: space-between; border-bottom: 1px solid var(--border); padding: 13px 18px; font: 10px var(--mono); color: var(--text-mid); }
.workbench-shot-bar > span:first-child { font-size: 8px; letter-spacing: .3em; color: var(--border-strong); }
.workbench-shot img { display: block; width: 100%; height: auto; }
.workbench-benefits { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 30px; }
.workbench-benefits h3 { font-size: 17px; line-height: 1.4; font-weight: 550; }
.workbench-benefits p { color: var(--text-body); font-size: 13px; margin-top: 10px; }
.workbench-section .text-link { margin-top: 24px; }
.engineering-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--border); }
.engineering-grid > a { position: relative; padding: 25px; background: var(--ground); }
.engineering-grid > a:hover { background: var(--surface-2); }
.engineering-grid h3 { font-size: 17px; font-weight: 550; line-height: 1.4; padding-right: 10px; }
.engineering-grid p { color: var(--text-body); font-size: 13px; margin-top: 12px; }
.engineering-grid > a > span { position: absolute; right: 16px; top: 22px; color: var(--green); }
.architecture-disclosure { margin-top: 30px; }
.architecture-disclosure summary { cursor: pointer; display: flex; justify-content: space-between; padding: 16px 0; font-size: 14px; color: var(--text-body); }
.architecture-disclosure summary::-webkit-details-marker { display: none; }
.architecture-disclosure summary span:last-child { color: var(--green); }
.architecture-disclosure[open] summary { margin-bottom: 15px; }
.command-box [role=tabpanel] { padding: 15px 20px 0; }
.command-box [role=tabpanel] pre { margin: 5px 0 20px; min-height: 116px; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 4px; }
@media (max-width:1050px) { .hero { gap: 30px; } .scene-chips span { font-size: 8px; } .runtime-feature { gap: 25px; padding: 25px; } .entity-tab { padding: 16px; } }
@media (max-width:800px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-block: 50px; }
  .hero-copy { max-width: 620px; } h1 { font-size: clamp(45px, 8vw, 65px); }
  html[lang=zh-CN] h1 { font-size: clamp(35px, 7vw, 54px); }
  .system-scene { max-width: 580px; width: 100%; }
  .entity-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .entity-panel, .runtime-feature { grid-template-columns: 1fr; gap: 24px; }
  .entity-panel > div:last-child { border-left: 0; border-top: 1px solid var(--border); padding: 20px 0 0; }
  .evidence-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .evidence-caption { grid-template-columns: 1fr; gap: 10px; }
  .workbench-benefits { grid-template-columns: 1fr; gap: 22px; }
  .engineering-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width:430px) {
  .system-scene { padding: 16px; } .scene-evolution { padding: 14px; }
  .scene-eight { font-size: 40px; } .scene-evolution h3 { font-size: 14px; }
  .scene-chips { gap: 4px; } .scene-label { font-size: 8px; }
  .entity-tab { padding: 14px; } .entity-tab small { font-size: 10px; }
  .entity-panel { padding: 22px; } .entity-panel h3 { font-size: 18px; }
  .runtime-feature h3 { font-size: 26px; } .runtime-branches { gap: 6px; }
  .runtime-branches span { font-size: 11px; }
  .engineering-grid { grid-template-columns: 1fr; }
  .workbench-shot-bar { font-size: 8px; padding: 10px; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }