:root {
  color-scheme: light;
  --ink: #15231d;
  --muted: #5d6963;
  --green: #176b45;
  --green-dark: #123d2f;
  --green-deep: #0b3125;
  --sage: #7f9c88;
  --mint: #eaf4ed;
  --cream: #f7f4ec;
  --gold: #d9af4d;
  --line: #d9e1dc;
  --danger: #9b3b38;
  --shadow: 0 20px 60px rgba(20, 55, 39, .10);
  --shadow-soft: 0 10px 32px rgba(20, 55, 39, .07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  color: var(--ink);
  background: #fbfcfa;
  line-height: 1.65;
}
button, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: sticky; top: 0; z-index: 30;
  height: 78px; padding: 0 max(24px, calc((100vw - 1240px) / 2));
  display: flex; align-items: center; gap: 32px;
  background: rgba(255,255,255,.92); border-bottom: 1px solid rgba(217,225,220,.8);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.brand > span:last-child { display: grid; line-height: 1.15; }
.brand b { font-size: 1.12rem; letter-spacing: .04em; color: var(--green-dark); }
.brand small { margin-top: 4px; color: #77827c; font-size: .68rem; }
.brand-mark { position: relative; flex: 0 0 auto; width: 42px; height: 42px; border-radius: 13px; background: var(--green-dark); overflow: hidden; }
.brand-mark::before, .brand-mark::after, .brand-mark span::before {
  content: ""; position: absolute; width: 14px; height: 24px; border-radius: 100% 0 100% 0; background: #fff;
  transform-origin: bottom right;
}
.brand-mark::before { left: 8px; top: 7px; transform: rotate(-22deg); }
.brand-mark::after { right: 8px; top: 10px; transform: scaleX(-1) rotate(-14deg); background: #d9efdf; }
.brand-mark span::before { left: 17px; top: 17px; width: 3px; height: 18px; border-radius: 4px; background: var(--gold); transform: rotate(0); }
.main-nav { display: flex; align-items: center; gap: 28px; color: #435049; font-size: .92rem; }
.main-nav a { padding: 8px 0; border-bottom: 2px solid transparent; transition: .2s ease; }
.main-nav a:hover { color: var(--green); border-color: var(--green); }
.nav-cta, .primary-action, button:not(.scenario-card,.text-action) {
  border: 0; border-radius: 999px; padding: .82rem 1.35rem; color: #fff; background: var(--green);
  font-weight: 700; cursor: pointer; transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.nav-cta { padding: .65rem 1.1rem; font-size: .88rem; }
.nav-cta:hover, .primary-action:hover, button:not(.scenario-card,.text-action):hover { background: var(--green-dark); transform: translateY(-1px); box-shadow: 0 8px 18px rgba(23,107,69,.18); }

main { overflow: hidden; }
.hero {
  width: min(1240px, calc(100% - 48px)); min-height: 660px; margin: 0 auto; padding: 72px 0 76px;
  display: grid; grid-template-columns: .92fr 1.08fr; gap: 66px; align-items: center;
}
.eyebrow, .section-kicker { margin: 0 0 12px; color: var(--green); font-weight: 800; font-size: .76rem; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 24px; font-size: clamp(2.65rem, 4.1vw, 4rem); line-height: 1.12; letter-spacing: -.055em; }
h1 em { color: var(--green); font-style: normal; }
.hero-intro { max-width: 600px; margin-bottom: 30px; color: var(--muted); font-size: 1.06rem; line-height: 1.85; }
.hero-actions { display: flex; align-items: center; gap: 22px; margin-bottom: 30px; }
.primary-action { min-width: 156px; font-size: 1rem; }
.text-action { border: 0; padding: .8rem 0; background: transparent; color: var(--green-dark); font-weight: 800; cursor: pointer; }
.text-action span { display: inline-block; margin-left: 4px; transition: transform .2s ease; }
.text-action:hover span { transform: translateX(4px); }
.hero-trust { display: flex; flex-wrap: wrap; gap: 10px 18px; color: #536059; font-size: .85rem; }
.hero-trust i { display: inline-grid; place-items: center; width: 18px; height: 18px; margin-right: 5px; border-radius: 50%; background: var(--mint); color: var(--green); font-style: normal; font-size: .7rem; font-weight: 900; }
.hero-visual { position: relative; margin: 0; min-height: 500px; border-radius: 30px 8px 30px 8px; overflow: hidden; box-shadow: var(--shadow); background: var(--green-dark); }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 48%, rgba(8,37,27,.82) 100%); pointer-events: none; }
.hero-visual img { width: 100%; height: 500px; object-fit: cover; }
.hero-visual figcaption { position: absolute; z-index: 2; left: 32px; right: 32px; bottom: 28px; color: #fff; }
.hero-visual figcaption b { display: block; max-width: 460px; font-size: 1.18rem; line-height: 1.45; }
.visual-kicker { display: inline-block; margin-bottom: 8px; color: #f2d88f; font-size: .75rem; font-weight: 800; letter-spacing: .1em; }

.section { width: min(1240px, calc(100% - 48px)); margin: 0 auto; padding: 88px 0; }
.intro-section { border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1fr 390px; gap: 48px; align-items: end; margin-bottom: 42px; }
.section-heading h2, .agent-heading h2, .governance h2 { max-width: 760px; margin: 0; font-size: clamp(2rem, 3vw, 2.8rem); line-height: 1.25; letter-spacing: -.035em; }
.section-heading > p { margin: 0; color: var(--muted); }
.section-heading.compact { align-items: center; }
.section-heading.compact a { justify-self: end; color: var(--green); font-weight: 800; }
.capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.capability-grid article { position: relative; min-height: 202px; padding: 28px; border: 1px solid var(--line); border-radius: 18px; background: #fff; transition: .2s ease; }
.capability-grid article:hover { transform: translateY(-3px); border-color: #bad1c2; box-shadow: var(--shadow-soft); }
.capability-grid article > span { display: block; margin-bottom: 28px; color: var(--gold); font-size: .78rem; font-weight: 900; letter-spacing: .08em; }
.capability-grid h3 { margin-bottom: 9px; font-size: 1.16rem; }
.capability-grid p { margin: 0; color: var(--muted); font-size: .91rem; }

.image-stories { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-top: 30px; }
.story-card { border-radius: 24px; overflow: hidden; background: var(--cream); }
.story-card img { width: 100%; height: 300px; object-fit: cover; }
.story-card > div { padding: 28px 30px 32px; }
.story-card h2, .story-card h3 { margin-bottom: 10px; font-size: 1.55rem; line-height: 1.3; }
.story-card p:last-child { margin: 0; color: var(--muted); }
.story-wide { grid-column: 1 / -1; display: grid; grid-template-columns: 1.35fr .65fr; align-items: stretch; }
.story-wide img { height: 390px; }
.story-wide > div { display: flex; flex-direction: column; justify-content: center; padding: 48px; background: var(--green-dark); color: #fff; }
.story-wide .section-kicker { color: #efd27f; }
.story-wide p:last-child { color: #d7e4dc; }

.workflow-section { padding-bottom: 104px; }
.workflow-track { position: relative; display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; margin: 0; padding: 0; list-style: none; }
.workflow-track::before { content: ""; position: absolute; left: 7%; right: 7%; top: 23px; height: 2px; background: #cadad0; }
.workflow-track li { position: relative; z-index: 1; display: grid; justify-items: center; text-align: center; padding: 0 10px; }
.workflow-track span { display: grid; place-items: center; width: 46px; height: 46px; margin-bottom: 15px; border-radius: 50%; background: #fff; border: 2px solid var(--green); color: var(--green); font-weight: 900; }
.workflow-track b { margin-bottom: 3px; font-size: .96rem; }
.workflow-track small { color: var(--muted); line-height: 1.45; }

.agent-shell { padding: 76px max(24px, calc((100vw - 1120px) / 2)) 100px; background: linear-gradient(180deg, #edf4ef 0%, #f8faf7 100%); border-top: 1px solid #d7e4db; border-bottom: 1px solid #d7e4db; }
.agent-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 32px; }
.agent-heading > div > p:last-child { margin: 10px 0 0; color: var(--muted); }
.guide-link { color: var(--green); font-weight: 800; font-size: .9rem; white-space: nowrap; }
.task-picker, .workspace-panel { max-width: 1120px; margin: 0 auto 18px; padding: 28px; border: 1px solid #d8e2db; border-radius: 22px; background: rgba(255,255,255,.96); box-shadow: var(--shadow-soft); }
.task-picker-title, .panel-step { display: flex; gap: 14px; align-items: center; margin-bottom: 22px; }
.task-picker-title > span { padding: 5px 10px; border-radius: 999px; color: var(--green); background: var(--mint); font-size: .72rem; font-weight: 800; }
.task-picker-title h3, .task-picker-title p, .panel-step h3, .panel-step small { margin: 0; }
.task-picker-title p { color: var(--muted); font-size: .85rem; }
.scenario-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.scenario-card { position: relative; min-height: 132px; padding: 20px 18px 18px 66px; text-align: left; border: 1px solid var(--line); border-radius: 16px; background: #fff; color: var(--ink); cursor: pointer; transition: .2s ease; }
.scenario-card:hover, .scenario-card.selected { border-color: var(--green); background: #f3f8f4; box-shadow: 0 8px 22px rgba(23,107,69,.08); }
.scenario-icon { position: absolute; left: 16px; top: 20px; display: grid; place-items: center; width: 38px; height: 38px; border-radius: 12px; color: #fff; background: var(--green-dark); font-size: .85rem; font-weight: 900; }
.scenario-card small, .scenario-card b, .scenario-card em { display: block; }
.scenario-card small { margin-bottom: 3px; color: var(--green); font-size: .7rem; font-weight: 800; }
.scenario-card b { margin-bottom: 3px; font-size: .96rem; }
.scenario-card em { color: var(--muted); font-size: .78rem; font-style: normal; }
.panel-step > span { display: grid; place-items: center; width: 42px; height: 42px; flex: 0 0 auto; border-radius: 13px; color: #fff; background: var(--green); font-weight: 900; }
.panel-step small { display: block; color: var(--green); font-size: .7rem; font-weight: 800; letter-spacing: .08em; }
.panel-step h3 { font-size: 1.22rem; }
.task-brief, .panel-help { color: var(--muted); }
.boundary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0; }
.boundary-grid > div { padding: 20px 22px; border-radius: 16px; background: #f7f9f7; }
.boundary-grid h4, .task-goal h4 { margin: 0 0 10px; font-size: .93rem; }
.boundary-grid ul, .task-goal ol { margin: 0; padding-left: 1.25rem; color: #4f5d55; font-size: .88rem; }
.task-goal { padding: 20px 22px; border-left: 4px solid var(--gold); border-radius: 0 14px 14px 0; background: #fcf8ed; }
.evidence-note { margin: 16px 0; color: var(--green-dark); font-size: .85rem; font-weight: 700; }
.workspace-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.workspace-actions.centered { justify-content: center; }
button.secondary { color: var(--green-dark); background: var(--mint); }
button.danger { background: var(--danger); }
button:disabled { opacity: .42; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
.session-line { margin: 12px 0 0; color: #7a877f; font-size: .78rem; font-weight: 700; }
.locked { opacity: .55; pointer-events: none; }
.hidden { display: none !important; }
textarea, select { width: 100%; margin: 8px 0 16px; padding: 15px 16px; border: 1px solid #bccbc1; border-radius: 13px; background: #fbfdfb; color: var(--ink); resize: vertical; }
textarea:focus, select:focus { outline: 4px solid rgba(23,107,69,.12); border-color: var(--green); }
.align-right { display: flex; justify-content: flex-end; }
.score-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 18px 0; }
.score-card { padding: 18px; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
.score-card b { display: block; color: var(--green-dark); font-size: 1.02rem; }
.score-card > span { color: var(--muted); font-size: .78rem; }
.score-card p { margin: 8px 0 0; color: var(--muted); font-size: .82rem; }
.warning, .success { padding: 16px 18px; border-radius: 14px; }
.warning { color: #68481b; background: #fff6db; }
.success { color: var(--green-dark); background: var(--mint); }
.evidence-details { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 14px; }
.evidence-details summary { color: var(--green); font-weight: 800; cursor: pointer; }
.evidence-card { margin: 10px 0; padding: 14px 16px; border-left: 3px solid var(--green); background: #f2f7f3; border-radius: 0 12px 12px 0; }
.evidence-card p { margin: 6px 0; color: var(--muted); font-size: .86rem; }
.evidence-card small { color: #718078; }
#comparison p, #comparison li { color: #4f5d55; }
.completion { text-align: center; padding: 44px; }
.completion-mark { display: grid; place-items: center; width: 58px; height: 58px; margin: 0 auto 14px; border-radius: 50%; color: #fff; background: var(--green); font-size: 1.5rem; font-weight: 900; }
.completion h3 { margin-bottom: 8px; font-size: 1.35rem; }

.governance { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: start; }
.governance-points { display: grid; gap: 12px; }
.governance-points p { display: grid; grid-template-columns: 120px 1fr; gap: 18px; margin: 0; padding: 18px 0; border-bottom: 1px solid var(--line); }
.governance-points b { color: var(--green-dark); }
.governance-points span { color: var(--muted); }

footer { padding: 46px max(24px, calc((100vw - 1240px) / 2)); display: grid; grid-template-columns: 1fr auto; gap: 26px 50px; align-items: center; color: #d4e1d8; background: var(--green-deep); }
.footer-brand { display: flex; align-items: center; gap: 13px; }
.footer-brand .brand-mark { width: 38px; height: 38px; background: #1b5b43; }
.footer-brand b { color: #fff; }
.footer-brand p { margin: 2px 0 0; font-size: .78rem; }
.footer-links { display: flex; gap: 24px; font-size: .85rem; }
.footer-links a:hover { color: #fff; }
.footer-note { grid-column: 1 / -1; margin: 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: .74rem; color: #a9bdb0; }
.toast { position: fixed; right: 20px; bottom: 20px; z-index: 50; max-width: min(440px, calc(100% - 40px)); padding: 14px 18px; color: #fff; background: #17231d; border-radius: 12px; box-shadow: var(--shadow); }

@media (max-width: 980px) {
  .main-nav { display: none; }
  .hero { grid-template-columns: 1fr; gap: 34px; padding-top: 52px; }
  .hero-copy { max-width: 760px; }
  .hero-visual, .hero-visual img { min-height: 420px; height: 420px; }
  .section-heading { grid-template-columns: 1fr; gap: 14px; }
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-track { grid-template-columns: repeat(3, 1fr); gap: 28px 0; }
  .workflow-track::before { display: none; }
  .governance { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 720px) {
  html { scroll-padding-top: 70px; }
  .site-header { height: 66px; padding: 0 16px; }
  .brand small, .nav-cta { display: none; }
  .hero, .section { width: min(100% - 32px, 1240px); }
  .hero { padding: 42px 0 56px; }
  h1 { font-size: clamp(2.25rem, 10vw, 3.3rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 4px; }
  .hero-visual, .hero-visual img { min-height: 340px; height: 340px; }
  .hero-visual figcaption { left: 22px; right: 22px; bottom: 20px; }
  .section { padding: 62px 0; }
  .capability-grid, .image-stories, .scenario-grid, .score-grid { grid-template-columns: 1fr; }
  .story-wide { grid-column: auto; display: block; }
  .story-wide img { height: 300px; }
  .story-wide > div { padding: 30px; }
  .workflow-track { grid-template-columns: repeat(2, 1fr); }
  .section-heading.compact a { justify-self: start; }
  .agent-shell { padding: 58px 16px 70px; }
  .agent-heading { align-items: flex-start; flex-direction: column; gap: 14px; }
  .task-picker, .workspace-panel { padding: 20px; border-radius: 18px; }
  .boundary-grid { grid-template-columns: 1fr; }
  .governance-points p { grid-template-columns: 1fr; gap: 5px; }
  footer { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
}