:root {
  --color-ink: #e7edf3;
  --color-muted: #95a3b1;
  --color-dim: #657384;
  --color-bg: #0d1117;
  --color-panel: #151c24;
  --color-panel-2: #1a232d;
  --color-line: #2b3743;
  --color-accent: #74e6c5;
  --color-accent-2: #f4b56a;
  --color-blue: #89a9ff;
  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow-card: 0 18px 60px rgba(0, 0, 0, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body { margin: 0; background: var(--color-bg); color: var(--color-ink); font-family: var(--font-body); line-height: 1.55; overflow-x: clip; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.site-shell { min-height: 100vh; }
.topbar { max-width: 1240px; margin: 0 auto; padding: 24px 32px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--color-line); }
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 700; letter-spacing: -0.02em; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border: 1px solid var(--color-accent); color: var(--color-accent); font: 700 11px/1 var(--font-mono); letter-spacing: 0; }
.topbar-meta, .footer-note { color: var(--color-muted); font: 11px/1.2 var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--color-accent); box-shadow: 0 0 0 4px rgba(116, 230, 197, 0.12); }
.section-grid, .section { max-width: 1240px; margin: 0 auto; padding-left: 32px; padding-right: 32px; }
.hero { min-height: 660px; padding-top: 105px; padding-bottom: 92px; display: grid; grid-template-columns: minmax(0, 1.06fr) minmax(340px, 0.94fr); gap: 90px; align-items: center; }
.eyebrow, .section-kicker, .panel-label, .label, .evidence-stamp { color: var(--color-accent); font: 11px/1.2 var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 750px; margin-bottom: 28px; font-size: clamp(3.1rem, 7vw, 6.8rem); line-height: 0.98; letter-spacing: -0.07em; font-weight: 700; }
h1 em { color: var(--color-accent); font-style: normal; }
.hero-lede { max-width: 610px; color: var(--color-muted); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 34px 0 28px; }
.button { min-height: 46px; padding: 0 18px; display: inline-flex; gap: 12px; align-items: center; justify-content: center; border: 1px solid var(--color-line); border-radius: 999px; cursor: pointer; transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); border-color: var(--color-accent); }
.button:focus-visible, .scenario:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
.button-primary { background: var(--color-accent); color: #10201d; border-color: var(--color-accent); font-weight: 750; }
.button-quiet { color: var(--color-ink); background: transparent; }
.trust-line { display: flex; flex-wrap: wrap; gap: 8px; }
.trust-chip { padding: 7px 9px; border: 1px solid var(--color-line); color: var(--color-dim); font: 10px/1 var(--font-mono); letter-spacing: 0.08em; }
.hero-aside { position: relative; }
.signal-card { padding: 28px; border: 1px solid var(--color-line); background: var(--color-panel); box-shadow: var(--shadow-card); }
.signal-card-head { display: flex; justify-content: space-between; gap: 18px; padding-bottom: 22px; border-bottom: 1px solid var(--color-line); }
.mono { color: var(--color-muted); font: 11px/1 var(--font-mono); }
.signal-title { margin: 44px 0 12px; font-size: 29px; letter-spacing: -0.04em; font-weight: 700; }
.signal-desc { color: var(--color-muted); }
.inline-code, code { color: var(--color-accent-2); font-family: var(--font-mono); }
.signal-rule { width: 68px; height: 3px; margin: 34px 0 24px; background: var(--color-accent); }
.signal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 24px; }
.signal-grid span { display: block; color: var(--color-dim); font: 10px/1.2 var(--font-mono); text-transform: uppercase; }
.signal-grid strong { display: block; margin-top: 7px; font-size: 14px; }
.annotation { margin: 18px 0 0 42px; color: var(--color-accent-2); font: 11px/1.4 var(--font-mono); }
.section { padding-top: 110px; padding-bottom: 110px; }
.intro-strip { display: grid; grid-template-columns: 0.5fr 1.4fr 0.65fr; gap: 30px; border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.intro-statement { max-width: 700px; font-size: clamp(24px, 3vw, 39px); line-height: 1.08; letter-spacing: -0.04em; }
.intro-note { color: var(--color-muted); font-size: 14px; align-self: end; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 32px; margin-bottom: 42px; }
.section-heading h2, .boundary-header h2, .usage-card h2 { max-width: 620px; margin: 12px 0 0; font-size: clamp(2rem, 4vw, 4.2rem); line-height: 1; letter-spacing: -0.06em; }
.section-heading > p { max-width: 350px; margin-bottom: 5px; color: var(--color-muted); }
.demo-section { background: #10161d; max-width: none; padding-left: max(32px, calc((100% - 1176px) / 2)); padding-right: max(32px, calc((100% - 1176px) / 2)); }
.demo-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 24px; }
.scenario-panel, .demo-console { border: 1px solid var(--color-line); background: var(--color-panel); }
.scenario-panel { padding: 14px; align-self: start; }
.panel-label { padding: 11px 10px 17px; color: var(--color-dim); }
.scenario { width: 100%; padding: 15px 10px; display: grid; grid-template-columns: 28px 1fr auto; gap: 10px; align-items: center; text-align: left; color: var(--color-ink); background: transparent; border: 1px solid transparent; cursor: pointer; }
.scenario:hover { background: var(--color-panel-2); }
.scenario.is-active { background: var(--color-panel-2); border-color: var(--color-accent); }
.scenario-index { color: var(--color-accent); font: 12px/1 var(--font-mono); }
.scenario strong, .scenario small { display: block; }
.scenario strong { font-size: 14px; }
.scenario small { margin-top: 3px; color: var(--color-muted); font-size: 11px; }
.scenario-arrow { color: var(--color-dim); }
.scenario-footnote { padding: 20px 10px 6px; color: var(--color-dim); font: 10px/1.5 var(--font-mono); }
.demo-console { min-width: 0; overflow: hidden; }
.console-head, .console-foot { padding: 14px 18px; display: flex; justify-content: space-between; gap: 14px; align-items: center; color: var(--color-muted); font: 11px/1.3 var(--font-mono); }
.console-head { border-bottom: 1px solid var(--color-line); }
.console-dot { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--color-accent); }
.console-mode { color: var(--color-accent-2); }
.console-body { min-height: 450px; padding: 30px; background: #0f151b; }
.message { max-width: 740px; }
.message-user { margin-left: auto; }
.message-label { margin-bottom: 9px; color: var(--color-dim); font: 10px/1 var(--font-mono); letter-spacing: .08em; }
.message-bubble { padding: 13px 16px; border: 1px solid var(--color-line); font: 13px/1.5 var(--font-mono); }
.user-bubble { color: #17201e; background: var(--color-accent); border-color: var(--color-accent); }
.process-line { margin: 25px 0; padding: 12px 14px; display: flex; gap: 10px; align-items: center; color: var(--color-accent); background: rgba(116, 230, 197, .06); border-left: 2px solid var(--color-accent); font: 11px/1.4 var(--font-mono); }
.message-agent { margin-right: auto; }
.markdown-result { padding: 24px; border: 1px solid var(--color-line); background: var(--color-panel); }
.markdown-result h3 { margin-bottom: 25px; color: var(--color-ink); font: 700 17px/1.3 var(--font-mono); }
.markdown-result h4 { margin: 20px 0 7px; color: var(--color-accent-2); font: 700 12px/1.3 var(--font-mono); }
.markdown-result ul { margin: 0; padding-left: 18px; color: var(--color-muted); font-size: 14px; }
.markdown-result li + li { margin-top: 4px; }
.send-confirm { margin-top: 25px; padding-top: 14px; border-top: 1px solid var(--color-line); color: var(--color-accent); font: 11px/1.4 var(--font-mono); }
.console-foot { border-top: 1px solid var(--color-line); color: var(--color-dim); }
.workflow-section { border-bottom: 1px solid var(--color-line); }
.compact-heading { margin-bottom: 32px; }
.workflow-track { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.workflow-step { min-height: 240px; padding: 22px; border-right: 1px solid var(--color-line); }
.workflow-step:last-child { border-right: 0; }
.workflow-step > span, .card-number { color: var(--color-accent); font: 11px/1 var(--font-mono); }
.workflow-step h3 { margin: 58px 0 10px; font-size: 20px; letter-spacing: -0.03em; }
.workflow-step p { color: var(--color-muted); font-size: 13px; }
.spec-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--color-line); border: 1px solid var(--color-line); }
.spec-card { min-height: 200px; padding: 23px; background: var(--color-bg); }
.spec-card h3 { margin: 42px 0 9px; font-size: 20px; letter-spacing: -0.03em; }
.spec-card p { margin-bottom: 0; color: var(--color-muted); font-size: 14px; }
.boundary-section { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 90px; background: var(--color-accent); color: #10201d; max-width: none; padding-left: max(32px, calc((100% - 1176px) / 2)); padding-right: max(32px, calc((100% - 1176px) / 2)); }
.boundary-header .section-kicker { color: #1c6b5c; }
.boundary-header h2 { margin-bottom: 17px; }
.boundary-header p { max-width: 310px; color: #2d5a50; }
.boundary-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; align-self: start; background: rgba(16, 32, 29, .22); }
.boundary-column { min-height: 360px; padding: 24px; background: var(--color-accent); }
.boundary-column.cannot { background: #d0f0e5; }
.boundary-title { font: 700 13px/1 var(--font-mono); }
.boundary-title span { margin-right: 8px; font-size: 22px; vertical-align: -2px; }
.boundary-column ul { margin: 50px 0 0; padding-left: 17px; }
.boundary-column li + li { margin-top: 14px; }
.evidence-section { border-bottom: 1px solid var(--color-line); }
.evidence-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.evidence-card { min-height: 230px; padding: 24px; display: flex; flex-direction: column; border: 1px solid var(--color-line); background: var(--color-panel); }
.evidence-card h3 { margin: 50px 0 9px; font-size: 21px; }
.evidence-card p { color: var(--color-muted); font-size: 14px; }
.evidence-card span:last-child { margin-top: auto; color: var(--color-accent-2); font: 11px/1 var(--font-mono); }
.usage-section { padding-top: 80px; padding-bottom: 80px; }
.usage-card { padding: 34px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; border: 1px solid var(--color-accent); background: var(--color-panel); }
.usage-card h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
.usage-command { align-self: center; color: var(--color-muted); }
.usage-command code { display: block; margin: 15px 0; padding: 16px; color: var(--color-accent); border: 1px solid var(--color-line); background: #0f151b; font-size: 14px; overflow-wrap: anywhere; }
.usage-command small { color: var(--color-dim); }
.footer { max-width: 1240px; margin: 0 auto; padding: 28px 32px 45px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid var(--color-line); }
.footer strong, .footer span { display: block; }
.footer strong { font-size: 14px; }
.footer span { margin-top: 4px; color: var(--color-muted); font: 11px/1.3 var(--font-mono); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 46px; padding-top: 75px; }
  .hero-aside { max-width: 620px; }
  .intro-strip { grid-template-columns: 1fr; gap: 18px; }
  .intro-note { max-width: 420px; }
  .demo-layout, .boundary-section { grid-template-columns: 1fr; gap: 30px; }
  .scenario-panel { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
  .panel-label, .scenario-footnote { grid-column: 1 / -1; }
  .workflow-track { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .workflow-step:nth-child(2n) { border-right: 0; }
  .workflow-step:nth-child(-n + 3) { border-bottom: 1px solid var(--color-line); }
  .boundary-header { max-width: 600px; }
}

@media (max-width: 620px) {
  .topbar, .section-grid, .section, .footer { padding-left: 20px; padding-right: 20px; }
  .topbar-meta { display: none; }
  .hero { min-height: auto; padding-top: 62px; padding-bottom: 70px; }
  h1 { font-size: clamp(2.8rem, 15vw, 4.7rem); }
  .hero-lede { font-size: 16px; }
  .signal-card { padding: 20px; }
  .signal-card-head { display: block; }
  .signal-card-head .mono { display: block; margin-top: 9px; }
  .signal-title { margin-top: 32px; font-size: 25px; }
  .section { padding-top: 75px; padding-bottom: 75px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 20px; }
  .demo-section, .boundary-section { padding-left: 20px; padding-right: 20px; }
  .scenario-panel { display: block; }
  .scenario { margin-bottom: 5px; }
  .console-body { padding: 20px; }
  .console-foot { display: block; }
  .console-foot span { display: block; }
  .console-foot span + span { margin-top: 7px; }
  .workflow-track, .spec-grid, .evidence-grid, .boundary-columns, .usage-card { grid-template-columns: 1fr; }
  .workflow-step { min-height: auto; border-right: 0; border-bottom: 1px solid var(--color-line); }
  .workflow-step:last-child { border-bottom: 0; }
  .workflow-step h3 { margin-top: 30px; }
  .boundary-column { min-height: auto; }
  .boundary-column ul { margin-top: 30px; }
  .usage-card { padding: 24px; }
  .footer { display: block; }
  .footer-note { margin-top: 20px; }
}