:root {
  --ink: #13243a;
  --muted: #6c7d92;
  --line: #dbe5ef;
  --blue: #2f63da;
  --blue-deep: #204aa8;
  --mint: #15a879;
  --mint-soft: #eaf8f3;
  --blue-soft: #eef4ff;
  --coral: #b96352;
  --paper: #ffffff;
  --wash: #f5f8fc;
  --shadow: 0 18px 48px rgba(31, 63, 103, .10);
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--wash);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--wash); color: var(--ink); }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }

.trace-shell { min-height: 100vh; }
.topline { background: var(--ink); color: #dce8f6; font-size: 12px; letter-spacing: .02em; }
.topline-inner, .nav-inner, .page { max-width: 1180px; margin: 0 auto; padding: 0 28px; }
.topline-inner { min-height: 34px; display: flex; align-items: center; justify-content: space-between; }
.nav { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.nav-inner { height: 76px; display: flex; align-items: center; gap: 30px; }
.brand { display: flex; align-items: center; gap: 14px; min-width: 250px; }
.brand-mark { display: flex; align-items: baseline; gap: 1px; color: var(--ink); font-size: 21px; letter-spacing: .13em; font-weight: 800; }
.brand-mark span:last-child { color: var(--blue); }
.brand-divider { width: 1px; height: 34px; background: var(--line); }
.brand-copy strong { display: block; font-size: 16px; letter-spacing: .08em; }
.brand-copy small { display: block; color: #8a99aa; font-size: 9px; letter-spacing: .15em; margin-top: 4px; }
.nav-links { display: flex; align-items: center; gap: 5px; flex: 1; }
.nav-links a { padding: 11px 13px; color: #68778a; font-size: 14px; border-radius: 7px; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue); background: var(--blue-soft); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-login { color: var(--ink); font-size: 14px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; border: 0; border-radius: 7px; padding: 13px 18px; font-weight: 650; font-size: 14px; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: white; background: var(--blue); box-shadow: 0 10px 24px rgba(47, 99, 218, .22); }
.button-primary:hover { background: var(--blue-deep); }
.button-quiet { color: var(--mint); background: var(--mint-soft); border: 1px solid #c9eee1; }
.button-outline { color: var(--ink); background: transparent; border: 1px solid var(--line); }
.button-outline:hover { border-color: var(--blue); color: var(--blue); }

.page { padding-top: 54px; padding-bottom: 80px; }
.hero { display: grid; grid-template-columns: 1.08fr .92fr; gap: 58px; align-items: center; padding: 34px 0 74px; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--blue); text-transform: uppercase; font-size: 12px; letter-spacing: .18em; font-weight: 750; }
.eyebrow::before { content: ""; display: block; width: 28px; height: 2px; background: var(--blue); }
.hero h1 { margin: 20px 0 17px; max-width: 650px; font-size: clamp(38px, 5vw, 67px); line-height: 1.08; letter-spacing: -.035em; font-weight: 760; }
.hero h1 em { color: var(--blue); font-style: normal; }
.hero p { margin: 0; max-width: 600px; color: var(--muted); font-size: 17px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-proof { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 33px; }
.proof strong { display: block; font-size: 20px; }
.proof span { display: block; color: var(--muted); font-size: 11px; margin-top: 3px; }
.hero-visual { position: relative; min-height: 360px; display: flex; align-items: center; justify-content: center; }
.hero-visual::before { content: ""; position: absolute; inset: 12px 0 0 18px; background: #e9f0fb; border: 1px solid #dae5f4; border-radius: 18px; transform: rotate(-2deg); }
.hero-visual::after { content: ""; position: absolute; inset: 0 14px 16px 0; border: 1px solid #cfe0f5; border-radius: 18px; }
.trace-panel { position: relative; z-index: 1; width: min(100%, 475px); background: var(--paper); border: 1px solid #cddbea; border-radius: 17px; padding: 24px; box-shadow: var(--shadow); }
.trace-panel-head { display: flex; align-items: center; justify-content: space-between; color: #8090a5; font-size: 11px; letter-spacing: .1em; }
.status { display: inline-flex; align-items: center; gap: 6px; color: var(--mint); }
.status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); }
.trace-panel h3 { margin: 35px 0 16px; font-size: 19px; }
.trace-input { width: 100%; min-height: 72px; border: 1px solid #cfe2df; border-radius: 12px; padding: 14px; color: #91a2b4; background: #f4faf8; font-size: 12px; }
.trace-tools { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 12px; }
.trace-tool { border: 1px solid #d8e3ec; background: #fff; border-radius: 10px; padding: 13px 11px; text-align: left; color: var(--ink); font-size: 11px; }
.trace-tool i { display: block; color: var(--mint); margin-bottom: 8px; }
.trace-line { display: flex; align-items: center; gap: 0; margin-top: 26px; }
.trace-node { flex: 1; position: relative; text-align: center; color: #97a6b5; font-size: 10px; }
.trace-node:not(:last-child)::after { content: ""; position: absolute; top: 10px; left: 50%; width: 100%; height: 1px; background: #c6d7d4; z-index: -1; }
.trace-node b { display: inline-flex; align-items: center; justify-content: center; width: 21px; height: 21px; border-radius: 50%; border: 1px solid var(--mint); color: var(--mint); background: white; font-size: 10px; }
.trace-node span { display: block; margin-top: 7px; }

.section { padding: 64px 0; border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 28px; }
.section-head h2 { margin: 10px 0 0; font-size: clamp(28px, 3.4vw, 45px); line-height: 1.16; letter-spacing: -.025em; }
.section-head p { max-width: 520px; color: var(--muted); line-height: 1.7; margin: 0; }
.kicker { color: #8b9aab; font-size: 11px; letter-spacing: .17em; text-transform: uppercase; }
.grid { display: grid; gap: 14px; }
.grid-3 { grid-template-columns: repeat(3,1fr); }
.grid-4 { grid-template-columns: repeat(4,1fr); }
.grid-2 { grid-template-columns: repeat(2,1fr); }
.tile { background: var(--paper); border: 1px solid var(--line); border-radius: 9px; padding: 23px; min-height: 180px; }
.tile:hover { border-color: #a8c1ea; box-shadow: 0 10px 28px rgba(42,79,132,.08); }
.tile h3 { margin: 17px 0 10px; font-size: 17px; }
.tile p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.tile-icon { color: var(--blue); }
.tile-index { color: var(--blue); font-size: 11px; letter-spacing: .12em; font-weight: 800; }
.tag-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.tag { display: inline-flex; align-items: center; border: 1px solid var(--line); color: #65758a; border-radius: 999px; padding: 6px 9px; font-size: 11px; background: #fbfdff; }
.tag.mint { color: #17886b; background: var(--mint-soft); border-color: #c8eee2; }
.tag.blue { color: var(--blue); background: var(--blue-soft); border-color: #d3e0fa; }

.service-tabs, .stage-tabs, .enterprise-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.tab-button { border: 1px solid var(--line); background: white; color: #6a7a8f; padding: 10px 14px; border-radius: 7px; font-size: 13px; }
.tab-button[aria-selected="true"] { color: var(--blue); border-color: #abc2ee; background: var(--blue-soft); font-weight: 700; }
.detail-panel { display: grid; grid-template-columns: .8fr 1.2fr; gap: 22px; background: white; border: 1px solid var(--line); border-radius: 12px; padding: 26px; }
.detail-panel h3 { margin: 0 0 10px; font-size: 22px; }
.detail-panel p { margin: 0; color: var(--muted); line-height: 1.75; font-size: 14px; }
.deliverable { border-left: 3px solid var(--mint); padding-left: 16px; }
.deliverable strong { display: block; font-size: 12px; color: var(--mint); letter-spacing: .08em; margin-bottom: 7px; }
.deliverable ul { margin: 0; padding-left: 17px; color: #61748a; font-size: 13px; line-height: 1.9; }

.stage-content { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: start; }
.stage-number { color: var(--blue); font-size: 46px; font-weight: 760; line-height: 1; }
.stage-content h3 { margin: 13px 0 10px; font-size: 24px; }
.stage-content p { margin: 0; color: var(--muted); line-height: 1.75; }
.practice-list { display: grid; gap: 10px; }
.practice-item { display: grid; grid-template-columns: 31px 1fr; gap: 13px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.practice-item b { display: inline-flex; width: 27px; height: 27px; align-items: center; justify-content: center; border-radius: 50%; color: var(--blue); background: var(--blue-soft); font-size: 11px; }
.practice-item strong { display: block; font-size: 14px; }
.practice-item span { display: block; color: var(--muted); font-size: 12px; margin-top: 4px; line-height: 1.55; }

.agent-shell { display: grid; grid-template-columns: .95fr 1.05fr; gap: 16px; }
.agent-workbench, .agent-output { background: white; border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.agent-workbench h3, .agent-output h3 { margin: 0 0 14px; font-size: 16px; }
.agent-form textarea { width: 100%; min-height: 118px; resize: vertical; border: 1px solid #cfe0ee; border-radius: 9px; padding: 14px; color: var(--ink); background: #fbfdff; line-height: 1.6; }
.agent-form textarea:focus { outline: 3px solid #dce8ff; border-color: var(--blue); }
.agent-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 11px; }
.quick-chip { border: 1px solid #d6e5df; color: #31856f; background: var(--mint-soft); border-radius: 999px; padding: 7px 10px; font-size: 11px; }
.run-button { margin-top: 13px; width: 100%; }
.output-status { display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 11px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.output-placeholder { min-height: 240px; display: grid; place-items: center; text-align: center; color: #9aacbd; font-size: 13px; }
.output-result { display: none; }
.output-result.active { display: block; }
.output-step { display: grid; grid-template-columns: 26px 1fr; gap: 11px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.output-step i { color: var(--mint); }
.output-step strong { display: block; font-size: 13px; }
.output-step span { display: block; color: var(--muted); font-size: 12px; line-height: 1.6; margin-top: 3px; }
.artifact-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.artifact { display: inline-flex; align-items: center; gap: 7px; padding: 8px 10px; color: var(--blue); border: 1px solid #cdddfa; background: var(--blue-soft); border-radius: 7px; font-size: 11px; }
.agent-principles { margin-top: 22px; display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; }
.principle { padding: 15px; border: 1px solid var(--line); border-radius: 8px; background: white; }
.principle strong { display: block; font-size: 13px; }
.principle span { display: block; margin-top: 5px; color: var(--muted); line-height: 1.5; font-size: 11px; }

.enterprise-hero { background: #f1f4f1; border: 1px solid #d7e2dd; border-radius: 13px; padding: 30px; }
.enterprise-hero .eyebrow { color: var(--coral); }
.enterprise-hero .eyebrow::before { background: var(--coral); }
.enterprise-hero h1 { max-width: 760px; margin: 18px 0 13px; font-size: clamp(34px, 4.3vw, 58px); line-height: 1.1; letter-spacing: -.03em; }
.enterprise-hero p { max-width: 690px; color: var(--muted); line-height: 1.8; margin: 0; }
.enterprise-hero .button-primary { background: var(--coral); box-shadow: 0 10px 24px rgba(185,99,82,.21); }
.enterprise-hero .button-primary:hover { background: #984d40; }
.enterprise-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 16px; }
.enterprise-panel { background: white; border: 1px solid var(--line); border-radius: 10px; padding: 22px; }
.enterprise-panel h3 { margin: 0 0 9px; font-size: 18px; }
.enterprise-panel p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.role-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 15px; }
.role { border: 1px solid #e1d4ce; background: #fffaf7; color: #986556; border-radius: 6px; padding: 7px 9px; font-size: 11px; }
.flow { display: grid; grid-template-columns: repeat(5,1fr); gap: 0; margin-top: 18px; }
.flow-step { position: relative; padding: 14px 10px 0 0; }
.flow-step:not(:last-child)::after { content: ""; position: absolute; left: 26px; right: 10px; top: 25px; height: 1px; background: #d9e4df; }
.flow-step b { position: relative; z-index: 1; display: inline-flex; align-items: center; justify-content: center; width: 29px; height: 29px; color: var(--coral); border: 1px solid #d4a99e; background: white; border-radius: 50%; font-size: 11px; }
.flow-step strong { display: block; margin-top: 10px; font-size: 12px; }
.flow-step span { display: block; margin-top: 4px; color: var(--muted); font-size: 11px; line-height: 1.45; }
.checklist { margin: 0; padding: 0; list-style: none; }
.checklist li { display: flex; align-items: flex-start; gap: 9px; padding: 10px 0; border-bottom: 1px solid var(--line); color: #5f7186; font-size: 13px; line-height: 1.55; }
.checklist i { flex: 0 0 auto; color: var(--mint); margin-top: 2px; }
.contact-strip { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin-top: 26px; padding: 22px 25px; border: 1px solid #cbdcdf; background: var(--mint-soft); border-radius: 10px; }
.contact-strip strong { font-size: 17px; }
.contact-strip span { display: block; color: #6b7d8b; font-size: 12px; margin-top: 4px; }

.footer { border-top: 1px solid var(--line); background: white; }
.footer-inner { max-width: 1180px; margin: 0 auto; padding: 25px 28px; display: flex; align-items: center; justify-content: space-between; gap: 18px; color: var(--muted); font-size: 11px; }
.footer-mark { color: var(--ink); font-weight: 800; letter-spacing: .12em; }

.toast { position: fixed; right: 22px; bottom: 22px; z-index: 20; max-width: 330px; padding: 13px 15px; border-radius: 8px; color: white; background: var(--ink); box-shadow: var(--shadow); transform: translateY(20px); opacity: 0; pointer-events: none; transition: .25s ease; font-size: 13px; }
.toast.show { transform: translateY(0); opacity: 1; }

@media (max-width: 900px) {
  .nav-inner { height: auto; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; gap: 14px; }
  .brand { min-width: auto; flex: 1; }
  .nav-links { order: 3; flex-basis: 100%; overflow-x: auto; padding-bottom: 2px; }
  .nav-links a { white-space: nowrap; padding: 9px 10px; }
  .hero, .agent-shell, .enterprise-grid, .detail-panel, .stage-content { grid-template-columns: 1fr; }
  .hero { gap: 35px; padding-top: 20px; }
  .hero-visual { min-height: 320px; }
  .grid-4 { grid-template-columns: repeat(2,1fr); }
  .agent-principles { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 560px) {
  .topline-inner, .nav-inner, .page, .footer-inner { padding-left: 17px; padding-right: 17px; }
  .topline-inner { font-size: 10px; }
  .nav-actions { gap: 8px; }
  .nav-login { display: none; }
  .brand-copy small { display: none; }
  .brand-copy strong { font-size: 14px; }
  .brand-mark { font-size: 18px; }
  .hero h1 { font-size: 40px; }
  .hero p { font-size: 15px; }
  .hero-proof { gap: 18px; }
  .section { padding: 48px 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 14px; }
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .trace-panel { padding: 18px; }
  .trace-tools { gap: 7px; }
  .trace-tool { padding: 11px 8px; font-size: 10px; }
  .flow { grid-template-columns: 1fr; gap: 12px; }
  .flow-step { padding: 0 0 0 40px; }
  .flow-step:not(:last-child)::after { left: 13px; right: auto; top: 28px; width: 1px; height: 48px; }
  .flow-step b { position: absolute; left: 0; top: 0; }
  .flow-step strong { margin-top: 0; }
  .agent-principles { grid-template-columns: 1fr; }
  .enterprise-hero { padding: 22px 18px; }
  .footer-inner { display: block; }
  .footer-inner span { display: block; margin-top: 8px; }
}