@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Manrope:wght@500;600;700;800&family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');

:root {
  --bg: #ffffff;
  --bg-soft: #edf2f8;
  --panel: #ffffff;
  --panel-2: #e3ebf5;
  --text: #0b1728;
  --muted: #5d6b7e;
  --line: rgba(11, 23, 40, .14);
  --lime: #246bfe;
  --cyan: #246bfe;
  --amber: #b27518;
  --red: #c74843;
  --green: #287a59;
  --shadow: 0 18px 45px rgba(33, 58, 91, .09);
  --radius: 8px;
}

html[data-theme="dark"] {
  --bg: #091321;
  --bg-soft: #101e31;
  --panel: #13233a;
  --panel-2: #1d3351;
  --text: #f2f6fb;
  --muted: #a4b2c5;
  --line: rgba(244, 241, 234, .16);
  --lime: #6ea1ff;
  --cyan: #6ea1ff;
  --shadow: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: "Noto Sans SC", system-ui, sans-serif; font-size: 16px; line-height: 1.7; transition: background .3s, color .3s; }
button, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
::selection { background: var(--lime); color: #07111c; }

body::before { content: none; }

.page-progress { position: fixed; inset: 0 0 auto; height: 3px; background: transparent; z-index: 100; }
.page-progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--lime), var(--cyan)); }
.topbar { position: fixed; top: 3px; left: 0; right: 0; height: 68px; z-index: 50; display: flex; align-items: center; justify-content: space-between; padding: 0 34px; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 84%, transparent); backdrop-filter: blur(18px); }
.brand { display: flex; gap: 12px; align-items: center; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand-mark { width: 32px; height: 32px; display: grid; place-items: center; border: 1px solid color-mix(in srgb, var(--lime) 55%, transparent); border-radius: 9px; background: color-mix(in srgb, var(--lime) 10%, transparent); color: var(--lime); font-family: "DM Mono"; }
.brand-mark span { color: var(--cyan); }
.topbar-meta { display: flex; align-items: center; gap: 12px; }
.course-chip { font: 12px "DM Mono"; text-transform: uppercase; color: var(--muted); padding: 7px 12px; border: 1px solid var(--line); border-radius: 99px; }
.theme-toggle { width: 36px; height: 36px; cursor: pointer; border-radius: 50%; border: 1px solid var(--line); color: var(--text); background: var(--panel); }

.shell { display: grid; grid-template-columns: 245px minmax(0, 1fr); max-width: 1530px; margin: 0 auto; }
.rail { position: sticky; top: 71px; height: calc(100vh - 71px); align-self: start; padding: 46px 24px 30px 34px; border-right: 1px solid var(--line); }
.rail-title { font: 11px "DM Mono"; letter-spacing: .14em; color: var(--muted); text-transform: uppercase; margin-bottom: 20px; }
.rail nav { display: grid; gap: 5px; }
.nav-link { display: flex; align-items: center; gap: 11px; padding: 9px 10px; border-radius: 8px; text-decoration: none; color: var(--muted); font-size: 14px; transition: .2s; }
.nav-link span { font: 10px "DM Mono"; color: color-mix(in srgb, var(--muted) 70%, transparent); }
.nav-link:hover { color: var(--text); background: color-mix(in srgb, var(--panel) 70%, transparent); }
.nav-link.is-active { color: var(--text); background: var(--panel); box-shadow: inset 2px 0 var(--lime); }
.nav-link.is-active span { color: var(--lime); }
.rail-progress { position: absolute; left: 34px; right: 24px; bottom: 32px; }
.rail-progress-label { display: flex; justify-content: space-between; margin-bottom: 9px; color: var(--muted); font-size: 12px; }
.rail-progress-label strong { color: var(--lime); font: 12px "DM Mono"; }
.progress-track { height: 3px; background: var(--line); }
.progress-track span { height: 100%; display: block; width: 0; background: var(--lime); transition: width .3s; }

main { min-width: 0; overflow: hidden; }
.section { max-width: 1180px; margin: 0 auto; padding: 115px 64px; border-bottom: 1px solid var(--line); scroll-margin-top: 68px; }
.hero { padding-top: 145px; max-width: none; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
.eyebrow, .section-kicker { display: flex; align-items: center; gap: 9px; font: 12px "DM Mono"; letter-spacing: .12em; text-transform: uppercase; color: var(--cyan); }
.eyebrow span { width: 7px; height: 7px; background: var(--cyan); border-radius: 50%; box-shadow: 0 0 18px var(--cyan); }
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 72px; align-items: center; margin-top: 30px; }
h1 { font-size: clamp(46px, 5.4vw, 82px); line-height: 1.05; letter-spacing: -.055em; margin: 0; max-width: 900px; font-weight: 900; }
.hero-lead { color: var(--muted); font-size: 18px; max-width: 680px; margin: 29px 0; }
.hero-lead strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; gap: 12px; }
.button { display: inline-flex; align-items: center; gap: 18px; padding: 12px 18px; min-height: 48px; border-radius: 9px; border: 1px solid var(--line); cursor: pointer; text-decoration: none; font-weight: 700; background: transparent; color: var(--text); }
.button.primary { background: var(--lime); border-color: var(--lime); color: #0a151e; }
.button.primary:hover { box-shadow: 0 0 0 5px color-mix(in srgb, var(--lime) 15%, transparent); }
.button.ghost:hover { background: var(--panel); }

.agent-console { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: linear-gradient(145deg, color-mix(in srgb, var(--panel) 88%, var(--cyan)), var(--panel)); box-shadow: var(--shadow); transform: rotate(.7deg); }
.console-bar { height: 52px; padding: 0 17px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); color: var(--muted); font: 11px "DM Mono"; text-transform: uppercase; }
.console-dots { display: flex; gap: 5px; }
.console-dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.live { color: var(--lime); }
.live i { display: inline-block; width: 6px; height: 6px; margin-right: 5px; border-radius: 50%; background: var(--lime); animation: pulse 1.4s infinite; }
.console-task { padding: 23px 25px; border-bottom: 1px solid var(--line); }
.console-label, .tiny-label { color: var(--cyan); font: 10px "DM Mono"; letter-spacing: .1em; text-transform: uppercase; }
.console-task p { margin: 8px 0 0; font-weight: 600; line-height: 1.6; }
.console-steps { padding: 17px 25px; margin: 0; list-style: none; display: grid; gap: 6px; }
.console-steps li { display: flex; gap: 13px; align-items: center; padding: 10px; color: var(--muted); border: 1px solid transparent; border-radius: 10px; }
.console-steps li > span { width: 26px; height: 26px; flex: 0 0 auto; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; font: 9px "DM Mono"; }
.console-steps strong, .console-steps small { display: block; }
.console-steps strong { color: var(--text); font-size: 13px; }
.console-steps small { font-size: 11px; }
.console-steps .done > span { color: #07111c; background: var(--lime); border-color: var(--lime); }
.console-steps .active { border-color: color-mix(in srgb, var(--cyan) 30%, transparent); background: color-mix(in srgb, var(--cyan) 7%, transparent); }
.console-steps .active > span { color: var(--cyan); border-color: var(--cyan); }
.console-foot { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; padding: 14px 25px; border-top: 1px solid var(--line); font: 10px "DM Mono"; color: var(--muted); }
.pulse-line { height: 2px; background: var(--line); overflow: hidden; }
.pulse-line i { display: block; height: 100%; width: 38%; background: var(--cyan); animation: scan 2s infinite ease-in-out; }
.lesson-strip { display: grid; grid-template-columns: repeat(4,1fr); margin-top: 90px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.lesson-strip > div { display: flex; gap: 14px; align-items: center; padding: 20px; border-right: 1px solid var(--line); }
.lesson-strip > div:last-child { border-right: 0; }
.lesson-strip strong { font: 20px "DM Mono"; color: var(--lime); }
.lesson-strip span { font-size: 14px; line-height: 1.5; font-weight: 600; }
.lesson-strip small { color: var(--muted); font-weight: 400; }

.section-kicker { color: var(--lime); margin-bottom: 16px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 50px; margin-bottom: 52px; }
.section-heading h2 { font-size: clamp(36px, 4vw, 58px); line-height: 1.15; letter-spacing: -.045em; margin: 0; max-width: 780px; }
.section-heading p { max-width: 390px; margin: 0; color: var(--muted); }
.split-heading h2 { max-width: 720px; }
.concept-grid { display: grid; grid-template-columns: 1.12fr .94fr .94fr; gap: 14px; }
.concept-card { min-height: 430px; padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); position: relative; overflow: hidden; }
.concept-card.featured { background: linear-gradient(160deg, color-mix(in srgb, var(--panel) 86%, var(--lime)), var(--panel) 65%); }
.concept-number { color: var(--muted); font: 11px "DM Mono"; }
.concept-icon { height: 114px; margin: 27px 0 20px; display: flex; align-items: end; justify-content: center; gap: 7px; }
.token-icon span { padding: 6px 9px; border: 1px solid color-mix(in srgb, var(--lime) 40%, var(--line)); background: color-mix(in srgb, var(--lime) 9%, transparent); border-radius: 6px; color: var(--lime); font-weight: 700; transform: translateY(var(--y,0)); }
.token-icon span:nth-child(1) { --y:-4px; }.token-icon span:nth-child(2) { --y:-18px; }.token-icon span:nth-child(3) { --y:-8px; }
.context-icon { align-items: center; }
.context-icon span { width: 68px; height: 78px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-soft); box-shadow: -8px 8px 0 color-mix(in srgb, var(--cyan) 11%, transparent); }
.context-icon span:nth-child(2) { width: 88px; height: 100px; margin-left: -56px; border-color: color-mix(in srgb, var(--cyan) 40%, var(--line)); }
.context-icon span:nth-child(3) { width: 48px; height: 58px; margin-left: -60px; background: color-mix(in srgb, var(--cyan) 13%, var(--panel)); }
.probability-icon { align-items: end; }
.probability-icon i { width: 16px; height: var(--h); background: linear-gradient(var(--cyan), color-mix(in srgb, var(--cyan) 8%, transparent)); border-radius: 4px 4px 0 0; }
.concept-card h3 { font-size: 20px; margin: 0 0 10px; }
.concept-card > p { color: var(--muted); font-size: 14px; }
.try-box { margin-top: 22px; padding: 14px; background: color-mix(in srgb, var(--bg) 60%, transparent); border-radius: 11px; }
.try-label { display: block; color: var(--muted); font: 9px "DM Mono"; margin-bottom: 8px; }
.sentence { border: 0; padding: 0; color: var(--text); background: none; cursor: pointer; text-align: left; font-weight: 600; }
.token-output { min-height: 29px; margin-top: 10px; font-size: 12px; color: var(--muted); }
.token-output span { display: inline-block; padding: 2px 5px; margin: 2px; border: 1px solid color-mix(in srgb, var(--lime) 45%, var(--line)); color: var(--lime); border-radius: 4px; }
.analogy { display: flex; gap: 10px; margin-top: 23px; align-items: center; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.analogy > span { font-size: 23px; }.analogy p { margin: 0; }.analogy b { color: var(--text); }
.analogy.warning > span { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 50%; color: var(--amber); border: 1px solid var(--amber); font: 14px "DM Mono"; }

.compare-panel { margin-top: 15px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); overflow: hidden; }
.compare-head { display: flex; justify-content: space-between; align-items: center; padding: 24px; border-bottom: 1px solid var(--line); }
.compare-head h3 { margin: 3px 0 0; }.segmented { display: flex; gap: 4px; padding: 4px; border-radius: 9px; background: var(--bg-soft); }
.segmented button { cursor: pointer; border: 0; background: transparent; color: var(--muted); padding: 8px 13px; border-radius: 6px; font-size: 13px; }
.segmented button.is-active { background: var(--panel-2); color: var(--text); box-shadow: 0 2px 10px rgba(0,0,0,.12); }
.compare-content { display: grid; grid-template-columns: .72fr 1.28fr; gap: 32px; align-items: center; min-height: 230px; padding: 30px; }
.compare-metaphor { display: grid; place-items: center; min-height: 160px; border-right: 1px solid var(--line); font-size: 72px; }
.compare-copy .compare-tag { color: var(--lime); font: 11px "DM Mono"; }.compare-copy h4 { margin: 7px 0; font-size: 25px; }.compare-copy p { color: var(--muted); margin: 0 0 16px; }.compare-copy dl { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 0; }.compare-copy dl div { padding: 11px; border: 1px solid var(--line); border-radius: 8px; }.compare-copy dt { color: var(--muted); font-size: 11px; }.compare-copy dd { margin: 2px 0 0; font-size: 13px; font-weight: 600; }

.loop-lab { display: grid; grid-template-columns: 1.25fr .75fr; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--panel); min-height: 520px; }
.loop-visual { position: relative; min-height: 520px; border-right: 1px solid var(--line); }
.loop-center { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); width: 156px; height: 156px; display: flex; flex-direction: column; align-items: center; justify-content: center; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--lime) 50%, var(--line)); background: radial-gradient(circle, color-mix(in srgb, var(--lime) 12%, var(--panel)), var(--panel)); box-shadow: 0 0 40px color-mix(in srgb, var(--lime) 8%, transparent); z-index: 2; }
.loop-center span { color: var(--lime); font: 10px "DM Mono"; }.loop-center strong { font-size: 28px; }.loop-center small { color: var(--muted); }
.loop-path { position: absolute; width: 420px; height: 360px; left: 50%; top: 50%; transform: translate(-50%,-50%); fill: none; stroke: var(--line); stroke-width: 2; stroke-dasharray: 5 7; }
.loop-node { position: absolute; z-index: 3; width: 112px; padding: 10px; cursor: pointer; border: 1px solid var(--line); background: var(--bg-soft); color: var(--text); border-radius: 11px; text-align: left; transition: .2s; }
.loop-node:hover, .loop-node.is-active { border-color: var(--cyan); transform: translateY(-2px); }
.loop-node span { float: left; margin-right: 8px; color: var(--cyan); font: 10px "DM Mono"; }.loop-node b, .loop-node small { display: block; }.loop-node b { font-size: 14px; }.loop-node small { font-size: 10px; color: var(--muted); }
.loop-node.n1 { left: 50%; top: 38px; transform: translateX(-50%); }.loop-node.n1:hover,.loop-node.n1.is-active { transform: translateX(-50%) translateY(-2px); }
.loop-node.n2 { right: 31px; top: 205px; }.loop-node.n3 { left: 50%; bottom: 38px; transform: translateX(-50%); }.loop-node.n3:hover,.loop-node.n3.is-active { transform: translateX(-50%) translateY(-2px); }.loop-node.n4 { left: 31px; top: 205px; }
.loop-detail { padding: 42px 32px; display: flex; flex-direction: column; }
.loop-detail h3 { font-size: 32px; margin: 13px 0; }.loop-detail p { color: var(--muted); }.loop-example { padding: 15px; border-left: 2px solid var(--cyan); background: color-mix(in srgb, var(--cyan) 5%, transparent); font-size: 13px; }.loop-example b { color: var(--cyan); }
.loop-rule { margin-top: auto; border-top: 1px solid var(--line); padding-top: 18px; }.loop-rule span { color: var(--lime); font: 10px "DM Mono"; }.loop-rule p { font-size: 12px; margin-bottom: 0; }
.formula { margin-top: 16px; padding: 19px; display: flex; align-items: center; justify-content: space-between; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.formula > div { text-align: center; min-width: 112px; }.formula span,.formula strong,.formula small { display: block; }.formula span { font-size: 23px; }.formula strong { font-size: 14px; }.formula small { font-size: 10px; color: var(--muted); }.formula > b { color: var(--muted); }.formula .formula-result { padding: 10px 17px; background: color-mix(in srgb, var(--lime) 10%, transparent); border-radius: 10px; }.formula-result span,.formula-result strong { color: var(--lime); }

.case-layout { display: grid; grid-template-columns: 230px 1fr; gap: 14px; }
.case-tabs { display: grid; gap: 7px; align-content: start; }
.case-tab { padding: 15px; cursor: pointer; text-align: left; border: 1px solid var(--line); border-radius: 11px; background: transparent; color: var(--muted); }
.case-tab span,.case-tab small { display: block; }.case-tab span { font-weight: 700; color: var(--text); }.case-tab small { margin-top: 2px; }.case-tab.is-active { background: var(--panel); border-color: color-mix(in srgb, var(--lime) 40%, var(--line)); box-shadow: inset 3px 0 var(--lime); }
.case-board { min-height: 450px; padding: 30px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.case-board-top { display: flex; justify-content: space-between; gap: 20px; align-items: start; padding-bottom: 25px; border-bottom: 1px solid var(--line); }.case-board-top h3 { margin: 4px 0; font-size: 28px; }.case-board-top p { margin: 0; color: var(--muted); }.case-time { flex: 0 0 auto; padding: 9px 12px; border-radius: 8px; color: var(--lime); background: color-mix(in srgb, var(--lime) 9%, transparent); font: 11px "DM Mono"; }
.workflow { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 25px; }.workflow-step { padding: 16px; border: 1px solid var(--line); border-radius: 11px; }.workflow-step > span { color: var(--cyan); font: 10px "DM Mono"; }.workflow-step h4 { margin: 9px 0 6px; }.workflow-step p { margin: 0; font-size: 12px; color: var(--muted); }
.human-agent { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }.human-agent > div { padding: 14px 16px; border-radius: 10px; background: var(--bg-soft); font-size: 12px; }.human-agent b { display: block; margin-bottom: 4px; color: var(--lime); }.human-agent > div:last-child b { color: var(--amber); }
.fit-check { display: grid; grid-template-columns: .75fr 1.3fr .55fr; gap: 25px; align-items: center; margin-top: 16px; padding: 25px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }.fit-intro h3 { margin: 4px 0 6px; }.fit-intro p { color: var(--muted); font-size: 12px; margin: 0; }.fit-items { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }.fit-items label { cursor: pointer; }.fit-input { position: absolute; opacity: 0; }.fit-items label > span { display: block; min-height: 78px; padding: 10px 10px 10px 35px; border: 1px solid var(--line); border-radius: 9px; position: relative; }.fit-items i { position: absolute; left: 10px; top: 13px; width: 15px; height: 15px; border: 1px solid var(--muted); border-radius: 4px; }.fit-items b,.fit-items small { display: block; }.fit-items b { font-size: 12px; }.fit-items small { color: var(--muted); font-size: 10px; }.fit-input:checked + span { border-color: var(--lime); background: color-mix(in srgb, var(--lime) 6%, transparent); }.fit-input:checked + span i { background: var(--lime); border-color: var(--lime); box-shadow: inset 0 0 0 3px var(--panel); }.fit-result { text-align: center; }.fit-result strong,.fit-result span { display: block; }.fit-result strong { font-size: 25px; color: var(--cyan); }.fit-result span { font-size: 11px; color: var(--muted); }

.brief-builder { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }.brief-form,.brief-preview { border: 1px solid var(--line); border-radius: 18px; background: var(--panel); padding: 24px; }.brief-form { display: grid; gap: 16px; }.brief-form label > span { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; }.brief-form label b { display: inline-grid; place-items: center; width: 23px; height: 23px; margin-right: 7px; border-radius: 6px; background: color-mix(in srgb, var(--cyan) 10%, transparent); color: var(--cyan); font: 11px "DM Mono"; }.brief-form textarea { width: 100%; resize: vertical; border: 1px solid var(--line); border-radius: 8px; padding: 10px; background: var(--bg-soft); color: var(--text); font-size: 12px; line-height: 1.55; outline: none; }.brief-form textarea:focus { border-color: var(--cyan); }.brief-preview { display: flex; flex-direction: column; background: linear-gradient(150deg, var(--panel), color-mix(in srgb, var(--panel) 87%, var(--cyan))); }.preview-bar { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font: 11px "DM Mono"; }.preview-bar button { border: 1px solid var(--line); border-radius: 6px; padding: 5px 9px; background: transparent; color: var(--text); cursor: pointer; }.brief-preview pre { white-space: pre-wrap; font: 13px/1.8 "Noto Sans SC"; color: var(--text); flex: 1; margin: 28px 0; }.quality-meter { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px; font-size: 11px; color: var(--muted); }.quality-meter > div { height: 4px; background: var(--line); }.quality-meter i { display: block; height: 100%; width: 85%; background: var(--lime); transition: width .3s; }.quality-meter strong { color: var(--lime); }.micro-tip { display: flex; justify-content: center; gap: 25px; margin-top: 20px; padding: 15px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }.micro-tip span { color: var(--cyan); font: 11px "DM Mono"; }

.traffic-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 13px; }.risk-card { padding: 25px; border: 1px solid var(--line); border-radius: 17px; background: var(--panel); }.risk-top { display: flex; gap: 13px; align-items: center; padding-bottom: 20px; border-bottom: 1px solid var(--line); }.light { width: 18px; height: 18px; border-radius: 50%; background: var(--green); box-shadow: 0 0 20px color-mix(in srgb, var(--green) 55%, transparent); }.risk-card.amber .light { background: var(--amber); box-shadow: 0 0 20px color-mix(in srgb, var(--amber) 55%, transparent); }.risk-card.red .light { background: var(--red); box-shadow: 0 0 20px color-mix(in srgb, var(--red) 55%, transparent); }.risk-top small { font: 9px "DM Mono"; color: var(--muted); }.risk-top h3 { margin: 2px 0 0; }.risk-card ul { padding-left: 19px; color: var(--muted); font-size: 13px; line-height: 2.2; }.risk-card > p { margin: 20px 0 0; padding-top: 15px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }.risk-card.green > p b { color: var(--green); }.risk-card.amber > p b { color: var(--amber); }.risk-card.red > p b { color: var(--red); }
.safety-checklist { display: grid; grid-template-columns: repeat(4,1fr); margin-top: 16px; border: 1px solid var(--line); border-radius: 15px; overflow: hidden; }.safety-checklist > div { display: flex; gap: 10px; padding: 18px; border-right: 1px solid var(--line); }.safety-checklist > div:last-child { border: 0; }.safety-checklist > div > span { color: var(--cyan); font: 10px "DM Mono"; }.safety-checklist p { margin: 0; }.safety-checklist b,.safety-checklist small { display: block; }.safety-checklist b { font-size: 13px; }.safety-checklist small { color: var(--muted); font-size: 10px; margin-top: 3px; }

.quiz-wrap { display: grid; gap: 12px; }.question-card { padding: 25px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }.question-card h3 { margin: 0 0 17px; font-size: 18px; }.question-card h3 span { color: var(--cyan); font: 11px "DM Mono"; margin-right: 10px; }.answers { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; }.answer { padding: 12px; cursor: pointer; text-align: left; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--muted); font-size: 12px; }.answer:hover { border-color: var(--cyan); color: var(--text); }.answer.selected { border-color: var(--lime); background: color-mix(in srgb, var(--lime) 7%, transparent); color: var(--text); }.quiz-submit { margin: 10px 0 0 auto; }.quiz-result { display: grid; grid-template-columns: 150px 1fr; align-items: center; gap: 40px; padding: 35px; border: 1px solid color-mix(in srgb, var(--lime) 40%, var(--line)); border-radius: 18px; background: color-mix(in srgb, var(--lime) 5%, var(--panel)); }.score-ring { width: 130px; height: 130px; display: flex; align-items: baseline; justify-content: center; border-radius: 50%; border: 1px solid var(--lime); box-shadow: inset 0 0 35px color-mix(in srgb, var(--lime) 8%, transparent); }.score-ring strong { font: 58px "DM Mono"; color: var(--lime); }.score-ring span { color: var(--muted); }.quiz-result h3 { font-size: 30px; margin: 6px 0; }.quiz-result p { color: var(--muted); }

.takeaway { max-width: 1180px; margin: 0 auto; padding: 110px 64px; text-align: center; }.takeaway blockquote { margin: 23px auto 36px; max-width: 890px; font-size: clamp(31px,4vw,54px); font-weight: 800; line-height: 1.3; letter-spacing: -.035em; }.takeaway blockquote strong { color: var(--lime); } footer { display: flex; justify-content: space-between; padding: 24px 40px; border-top: 1px solid var(--line); color: var(--muted); font: 11px "DM Mono"; }

dialog { width: min(760px, calc(100vw - 30px)); color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 22px; padding: 40px; box-shadow: var(--shadow); } dialog::backdrop { background: rgba(0,7,14,.76); backdrop-filter: blur(8px); }.dialog-close { position: absolute; right: 18px; top: 14px; color: var(--muted); background: transparent; border: 0; font-size: 28px; cursor: pointer; }.dialog-close:hover { color: var(--text); } dialog h2 { font-size: 34px; line-height: 1.3; margin: 10px 0 35px; }.overview-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 14px; align-items: center; }.overview-flow > div { text-align: center; padding: 20px 10px; border: 1px solid var(--line); border-radius: 12px; }.overview-flow span,.overview-flow b,.overview-flow small { display: block; }.overview-flow span { font-size: 27px; }.overview-flow b { margin: 7px 0 3px; }.overview-flow small { color: var(--muted); font-size: 10px; }.overview-flow .agent-box { border-color: var(--lime); background: color-mix(in srgb, var(--lime) 6%, transparent); }.overview-flow > i { color: var(--cyan); font-style: normal; }.dialog-note { margin: 25px 0 0; padding: 13px 15px; border-left: 2px solid var(--amber); background: color-mix(in srgb, var(--amber) 5%, transparent); color: var(--muted); font-size: 13px; }
.toast { position: fixed; right: 25px; bottom: 25px; z-index: 100; padding: 10px 15px; border-radius: 8px; background: var(--lime); color: #07111c; font-size: 12px; font-weight: 700; transform: translateY(80px); opacity: 0; transition: .3s; }.toast.show { transform: none; opacity: 1; }

@keyframes pulse { 50% { opacity: .3; transform: scale(.7); } }
@keyframes scan { 0% { transform: translateX(-110%); } 100% { transform: translateX(360%); } }

@media (max-width: 1100px) {
  .shell { grid-template-columns: 1fr; }.rail { display: none; }.section { padding-left: 40px; padding-right: 40px; }.hero-grid { gap: 35px; }.concept-grid { grid-template-columns: 1fr 1fr; }.concept-card:first-child { grid-column: 1 / -1; min-height: auto; }.fit-check { grid-template-columns: 1fr; }.fit-items { grid-template-columns: repeat(4,1fr); }.safety-checklist { grid-template-columns: 1fr 1fr; }.safety-checklist > div:nth-child(2) { border-right: 0; }.safety-checklist > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 780px) {
  .topbar { padding: 0 17px; }.course-chip { display: none; }.section { padding: 88px 19px; }.hero { padding-top: 115px; min-height: auto; }.hero-grid { grid-template-columns: 1fr; }.hero-lead { font-size: 16px; }.agent-console { transform: none; }.lesson-strip { grid-template-columns: 1fr 1fr; margin-top: 55px; }.lesson-strip > div:nth-child(2) { border-right: 0; }.lesson-strip > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }.section-heading { display: block; }.section-heading p { margin-top: 17px; }.concept-grid { grid-template-columns: 1fr; }.concept-card:first-child { grid-column: auto; }.concept-card { min-height: auto; }.compare-head { display: block; }.segmented { margin-top: 15px; overflow-x: auto; }.compare-content { grid-template-columns: 1fr; }.compare-metaphor { min-height: 100px; border: 0; border-bottom: 1px solid var(--line); }.loop-lab { grid-template-columns: 1fr; }.loop-visual { border-right: 0; border-bottom: 1px solid var(--line); transform: scale(.88); margin: -30px; }.loop-detail { min-height: 400px; }.formula { overflow-x: auto; gap: 14px; justify-content: flex-start; }.formula > div { min-width: 100px; }.case-layout { grid-template-columns: 1fr; }.case-tabs { grid-template-columns: 1fr 1fr; }.workflow { grid-template-columns: 1fr; }.fit-items { grid-template-columns: 1fr 1fr; }.brief-builder { grid-template-columns: 1fr; }.micro-tip { flex-direction: column; gap: 3px; text-align: center; }.traffic-grid { grid-template-columns: 1fr; }.answers { grid-template-columns: 1fr; }.quiz-result { grid-template-columns: 1fr; text-align: center; }.score-ring { margin: auto; }.takeaway { padding: 88px 20px; }.overview-flow { grid-template-columns: 1fr; }.overview-flow > i { transform: rotate(90deg); }.dialog { padding: 31px 20px; max-height: 90vh; overflow: auto; }.dialog h2 { font-size: 25px; } footer { padding: 20px; flex-direction: column; gap: 5px; }
}

@media (max-width: 460px) {
  h1 { font-size: 42px; }.hero-actions { align-items: stretch; flex-direction: column; }.button { justify-content: center; }.lesson-strip { grid-template-columns: 1fr; }.lesson-strip > div { border-right: 0; border-bottom: 1px solid var(--line); }.case-tabs { grid-template-columns: 1fr; }.fit-items { grid-template-columns: 1fr; }.human-agent { grid-template-columns: 1fr; }.safety-checklist { grid-template-columns: 1fr; }.safety-checklist > div { border-right: 0; border-bottom: 1px solid var(--line); }.compare-copy dl { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *,*::before,*::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }

/* Professional editorial redesign */
.page-progress span { background: var(--lime); }
.topbar { background: color-mix(in srgb, var(--bg) 94%, transparent); backdrop-filter: blur(14px); }
.brand-mark { border: 1px solid var(--lime); border-radius: 4px; background: var(--lime); color: #fff; }
.brand-mark span { color: #fff; }
.course-chip { border-radius: 2px; }
.theme-toggle { border-radius: 2px; background: transparent; }
.nav-link { border-radius: 2px; }
.nav-link.is-active { background: transparent; }
.eyebrow span { border-radius: 0; box-shadow: none; }
h1, .section-heading h2, .takeaway blockquote { font-family: "Manrope", "Noto Sans SC", sans-serif; }
h1 { line-height: 1.12; font-weight: 900; }
.button { border-radius: 2px; border-color: var(--text); }
.button.primary { background: var(--text); border-color: var(--text); color: var(--bg); }
.button.primary:hover { box-shadow: none; opacity: .82; }
.agent-console { border-color: var(--text); background: var(--panel); box-shadow: var(--shadow); transform: none; }
.live i { animation: none; }
.console-steps .done > span { color: var(--panel); }
.concept-card { border-radius: var(--radius); background: transparent; }
.concept-card.featured { background: var(--panel); border-color: var(--text); }
.context-icon span { box-shadow: -6px 6px 0 var(--bg-soft); }
.probability-icon i { background: var(--lime); }
.compare-panel, .loop-lab, .formula, .fit-check { border-radius: var(--radius); background: transparent; }
.loop-center { border-color: var(--text); background: var(--bg); box-shadow: none; }
.loop-node, .case-tab, .workflow-step, .human-agent > div, .fit-items label > span { border-radius: 2px; }
.formula .formula-result { border-radius: 2px; background: var(--panel); border: 1px solid var(--line); }
.case-board { border-radius: var(--radius); }
.case-time { border-radius: 2px; background: transparent; border: 1px solid var(--line); }
.case-tab.is-active { background: transparent; border-color: var(--text); }
.fit-items i { border-radius: 1px; }
.fit-input:checked + span { border-color: var(--text); background: var(--panel); }
.brief-form, .brief-preview { border-radius: var(--radius); }
.brief-form label b, .brief-form textarea, .preview-bar button { border-radius: 2px; }
.brief-preview { background: transparent; }
.quality-meter > div { height: 2px; }
.risk-card, .question-card, .quiz-result { border-radius: var(--radius); background: transparent; }
.light, .risk-card.amber .light, .risk-card.red .light { box-shadow: none; }
.answer { border-radius: 2px; }
.answer.selected { border-color: var(--text); background: var(--panel); }
.quiz-result { border-color: var(--text); background: var(--panel); }
.score-ring { box-shadow: none; }
.takeaway blockquote { line-height: 1.4; font-weight: 700; }
dialog { border-color: var(--text); border-radius: var(--radius); }
.overview-flow > div { border-radius: 2px; }
.toast { border-radius: 2px; color: var(--panel); }

/* Expanded learning modules */
.relationship-board {
  display: grid;
  grid-template-columns: 1.35fr .32fr .8fr;
  align-items: center;
  gap: 20px;
  padding: 26px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.scope-stack { min-height: 390px; }
.scope-layer { position: relative; border: 1px solid var(--line); }
.scope-layer > strong, .scope-layer > small { display: block; }
.scope-layer > strong { font-family: "Manrope", "Noto Sans SC", sans-serif; font-size: 20px; }
.scope-layer > small { color: var(--muted); font-size: 12px; max-width: 300px; }
.scope-code { color: var(--lime); font: 10px "DM Mono"; letter-spacing: .1em; }
.ai-layer { height: 390px; padding: 22px; background: color-mix(in srgb, var(--lime) 3%, var(--panel)); }
.ml-layer { position: absolute; left: 22%; right: 22px; top: 82px; bottom: 22px; padding: 18px; background: var(--panel); }
.dl-layer { position: absolute; left: 22%; right: 18px; top: 75px; bottom: 18px; padding: 16px; background: var(--bg-soft); }
.llm-layer { position: absolute; left: 24%; right: 15px; top: 68px; bottom: 15px; padding: 15px; border-color: var(--lime); background: color-mix(in srgb, var(--lime) 6%, var(--panel)); }
.llm-layer > strong { font-size: 18px; }
.llm-layer > small { font-size: 11px; }
.relation-bridge { display: grid; justify-items: center; gap: 10px; color: var(--muted); }
.relation-bridge span { font-size: 10px; writing-mode: vertical-rl; }
.relation-bridge i { color: var(--lime); font: 28px "DM Mono"; }
.agent-system-card { padding: 28px 24px; border: 1px solid var(--text); background: var(--bg); }
.agent-system-card h3 { margin: 8px 0 12px; font: 800 34px/1.1 "Manrope", "Noto Sans SC", sans-serif; }
.agent-system-card p { color: var(--muted); font-size: 14px; }
.agent-parts-mini { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; margin-top: 22px; }
.agent-parts-mini span { padding: 5px 8px; border: 1px solid var(--line); background: var(--panel); font-size: 11px; }
.agent-parts-mini b { color: var(--lime); font-weight: 400; }
.relationship-takeaway { display: grid; grid-template-columns: 160px 1fr; gap: 25px; align-items: center; padding: 22px 26px; border: 1px solid var(--text); border-top: 0; }
.relationship-takeaway > span { color: var(--lime); font: 11px "DM Mono"; }
.relationship-takeaway p { margin: 0; font-size: 18px; }
.term-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 16px; border: 1px solid var(--line); }
.term-grid article { min-height: 205px; padding: 20px; border-right: 1px solid var(--line); }
.term-grid article:last-child { border-right: 0; }
.term-grid article > span { color: var(--lime); font: 10px "DM Mono"; }
.term-grid h3 { margin: 28px 0 8px; font-size: 16px; }
.term-grid p { margin: 0; color: var(--muted); font-size: 12px; }

.definition-block { display: grid; grid-template-columns: .9fr 1.1fr; gap: 15px; margin-bottom: 16px; }
.definition-copy { padding: 30px; border: 1px solid var(--text); background: var(--panel); }
.definition-copy blockquote { margin: 18px 0 25px; font: 700 clamp(21px, 2.1vw, 30px)/1.5 "Manrope", "Noto Sans SC", sans-serif; letter-spacing: -.025em; }
.definition-copy blockquote strong { color: var(--lime); }
.definition-copy > p { color: var(--muted); margin: 0; font-size: 14px; }
.definition-copy > p strong { color: var(--text); }
.editorial-figure { margin: 0; border: 1px solid var(--line); background: #fff; overflow: hidden; }
.editorial-figure img { display: block; width: 100%; height: auto; object-fit: cover; }
.editorial-figure figcaption { padding: 11px 14px; border-top: 1px solid var(--line); color: var(--muted); background: var(--panel); font-size: 11px; }
.agent-figure img { height: 360px; }
.anatomy-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-bottom: 16px; border: 1px solid var(--line); }
.anatomy-grid article { min-height: 150px; padding: 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.anatomy-grid article:nth-child(3n) { border-right: 0; }
.anatomy-grid article:nth-child(n+4) { border-bottom: 0; }
.anatomy-grid span { color: var(--lime); font: 10px "DM Mono"; }
.anatomy-grid h3 { margin: 20px 0 5px; font-size: 16px; }
.anatomy-grid p { margin: 0; color: var(--muted); font-size: 12px; }
.agent-spectrum { margin-top: 16px; border: 1px solid var(--line); }
.spectrum-head { display: flex; justify-content: space-between; gap: 35px; align-items: end; padding: 24px; border-bottom: 1px solid var(--line); }
.spectrum-head h3 { margin: 5px 0 0; font-size: 23px; }
.spectrum-head p { max-width: 430px; margin: 0; color: var(--muted); font-size: 12px; }
.spectrum-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.spectrum-grid article { min-height: 190px; padding: 20px; border-right: 1px solid var(--line); }
.spectrum-grid article:last-child { border: 0; }
.spectrum-grid article.is-agent { background: color-mix(in srgb, var(--lime) 4%, var(--panel)); }
.spectrum-level { display: inline-block; padding: 2px 6px; border: 1px solid var(--line); color: var(--muted); font: 10px "DM Mono"; }
.is-agent .spectrum-level { border-color: var(--lime); color: var(--lime); }
.spectrum-grid h4 { margin: 28px 0 8px; font-size: 16px; }
.spectrum-grid p { min-height: 60px; margin: 0; color: var(--muted); font-size: 12px; }
.spectrum-grid small { color: var(--text); font-size: 10px; }

.history-figure { margin-bottom: 17px; }
.history-figure img { aspect-ratio: 3 / 1; }
.history-timeline { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.history-timeline article { min-height: 270px; padding: 23px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.history-timeline article:nth-child(3n) { border-right: 0; }
.history-timeline article:nth-child(n+4) { border-bottom: 0; }
.history-timeline time { color: var(--lime); font: 11px "DM Mono"; }
.history-timeline h3 { margin: 34px 0 10px; font: 700 19px/1.35 "Manrope", "Noto Sans SC", sans-serif; }
.history-timeline p { margin: 0 0 18px; color: var(--muted); font-size: 12px; }
.history-timeline article > span { display: block; padding-top: 10px; border-top: 1px solid var(--line); color: var(--text); font-size: 10px; }
.history-note { display: grid; grid-template-columns: 140px 1fr; gap: 25px; padding: 24px; border: 1px solid var(--text); border-top: 0; }
.history-note > span { color: var(--lime); font: 11px "DM Mono"; }
.history-note p { margin: 0; color: var(--muted); }
.history-note strong { color: var(--text); }
.source-strip { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; padding: 17px 0; border-bottom: 1px solid var(--line); }
.source-strip > span { color: var(--muted); font: 10px "DM Mono"; margin-right: auto; }
.source-strip a { color: var(--text); text-decoration: none; font-size: 11px; }
.source-strip a:hover { color: var(--lime); }

@media (max-width: 1100px) {
  .term-grid { grid-template-columns: 1fr 1fr; }
  .term-grid article:nth-child(2) { border-right: 0; }
  .term-grid article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .definition-block { grid-template-columns: 1fr; }
  .agent-figure img { height: auto; }
}

@media (max-width: 780px) {
  .relationship-board { grid-template-columns: 1fr; padding: 12px; }
  .scope-stack { min-height: 410px; }
  .relation-bridge { grid-template-columns: 1fr auto; justify-content: center; }
  .relation-bridge span { writing-mode: horizontal-tb; }
  .relation-bridge i { transform: rotate(90deg); }
  .relationship-takeaway { grid-template-columns: 1fr; gap: 6px; }
  .term-grid, .anatomy-grid, .spectrum-grid, .history-timeline { grid-template-columns: 1fr; }
  .term-grid article, .anatomy-grid article, .spectrum-grid article, .history-timeline article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .term-grid article:last-child, .anatomy-grid article:last-child, .spectrum-grid article:last-child, .history-timeline article:last-child { border-bottom: 0; }
  .anatomy-grid article:nth-child(3n) { border-right: 0; }
  .anatomy-grid article:nth-child(n+4), .history-timeline article:nth-child(n+4) { border-bottom: 1px solid var(--line); }
  .anatomy-grid article:last-child, .history-timeline article:last-child { border-bottom: 0; }
  .spectrum-head { display: block; }
  .spectrum-head p { margin-top: 12px; }
  .history-figure img { min-height: 220px; object-fit: cover; }
  .history-note { grid-template-columns: 1fr; gap: 7px; }
  .source-strip { display: grid; }
  .source-strip > span { margin-right: 0; }
}

@media (max-width: 460px) {
  .scope-stack { min-height: 440px; }
  .ai-layer { height: 440px; padding: 14px; }
  .ml-layer { left: 10%; right: 12px; top: 88px; bottom: 12px; }
  .dl-layer { left: 10%; right: 10px; top: 80px; bottom: 10px; }
  .llm-layer { left: 10%; right: 8px; top: 74px; bottom: 8px; }
  .definition-copy { padding: 23px 18px; }
}