:root{
  --brand:#4D6BFE;
  --brand-soft:#e8ecff;
  --ink:#0d1730;
  --ink-2:#5a6480;
  --line:#dde3f0;
  --bg:#f5f7fc;
  --panel:#ffffff;
  --radius:10px;
  --shadow:0 1px 2px rgba(13,23,48,.05), 0 8px 24px rgba(13,23,48,.06);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

.shell{
  display:grid;
  grid-template-columns:340px minmax(0,1fr);
  max-width:1280px;
  margin:0 auto;
  gap:0;
}

/* ---------- 左侧控制台 ---------- */
.console{
  position:sticky;
  top:0;
  align-self:start;
  height:100vh;
  padding:40px 32px;
  border-right:1px solid var(--line);
  display:flex;
  flex-direction:column;
  gap:26px;
  overflow-y:auto;
}

.brand{display:flex;align-items:center;gap:12px}
.mark{width:36px;height:36px;color:var(--brand);flex:none}
.brand strong{display:block;font-size:18px;letter-spacing:.02em}
.brand span{display:block;font-size:12px;color:var(--ink-2);letter-spacing:.08em;text-transform:uppercase}

.console-lead{margin:0;font-size:15px;color:var(--ink-2)}

.spec{margin:0;border-top:1px solid var(--line)}
.spec > div{
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:9px 0;
  border-bottom:1px solid var(--line);
  font-size:13px;
}
.spec dt{color:var(--ink-2);flex:none}
.spec dd{margin:0;text-align:right;font-weight:600}

.cta-block{margin-top:auto}
.cta{
  width:100%;
  padding:13px 20px;
  border:none;
  border-radius:var(--radius);
  background:var(--brand);
  color:#fff;
  font-size:15px;
  font-weight:600;
  font-family:inherit;
  letter-spacing:.02em;
  cursor:pointer;
  transition:background .18s ease, transform .18s ease;
}
.cta:hover:not(:disabled){background:#3a56e0;transform:translateY(-1px)}
.cta:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.cta:disabled{
  background:#c9d1e8;
  color:#5a6480;
  cursor:not-allowed;
}
.cta-note{margin:10px 0 0;font-size:12px;line-height:1.55;color:var(--ink-2)}

.toc{display:flex;flex-direction:column;gap:2px;border-top:1px solid var(--line);padding-top:16px}
.toc a{
  padding:6px 0;
  color:var(--ink-2);
  text-decoration:none;
  font-size:13px;
  transition:color .15s ease;
}
.toc a:hover,.toc a:focus-visible{color:var(--brand)}

/* ---------- 右侧长内容 ---------- */
.stream{padding:0 56px 0;min-width:0}
.stream section{padding:72px 0;border-bottom:1px solid var(--line)}
.stream section:last-of-type{border-bottom:none}

h1{
  margin:14px 0 20px;
  font-size:clamp(34px,4.4vw,54px);
  line-height:1.16;
  letter-spacing:-.02em;
  font-weight:700;
}
h2{margin:0 0 12px;font-size:clamp(22px,2.4vw,28px);line-height:1.3;letter-spacing:-.01em}
h3{margin:0 0 6px;font-size:16px}

.kicker{
  margin:0;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--brand);
  font-weight:600;
}
.hero-sub{margin:0;max-width:46ch;font-size:17px;color:var(--ink-2)}

/* 便签舞台 */
.stage{
  position:relative;
  margin-top:44px;
  height:260px;
  border:1px dashed var(--line);
  border-radius:var(--radius);
  background:
    linear-gradient(180deg,rgba(77,107,254,.05),rgba(77,107,254,0)),
    repeating-linear-gradient(90deg,transparent 0 39px,rgba(13,23,48,.045) 39px 40px),
    repeating-linear-gradient(0deg,transparent 0 39px,rgba(13,23,48,.045) 39px 40px);
  overflow:hidden;
}
.stage-note{
  position:absolute;
  width:190px;
  padding:16px 16px 20px;
  background:var(--panel);
  border:1px solid var(--line);
  border-top:3px solid var(--brand);
  border-radius:6px;
  box-shadow:var(--shadow);
  font-size:13px;
  line-height:1.5;
}
.stage-note p{margin:0}
.pin{display:block;width:8px;height:8px;border-radius:50%;background:var(--brand);margin-bottom:10px}
.n1{top:26px;left:24px;transform:rotate(-2deg)}
.n2{top:74px;left:calc(50% - 60px);transform:rotate(1.5deg);border-top-color:#0d1730}
.n3{top:36px;right:24px;transform:rotate(-1deg);border-top-color:#8fa2ff}

/* 能力清单 */
.cap-list{
  list-style:none;
  margin:24px 0 0;
  padding:0;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 40px;
}
.cap-list li{
  padding:20px 0;
  border-top:1px solid var(--line);
}
.cap-list li::before{
  content:"";
  display:block;
  width:22px;
  height:2px;
  background:var(--brand);
  margin-bottom:12px;
}
.cap-list p{margin:0;font-size:14px;color:var(--ink-2)}

/* 三步流程 */
.section-sub{margin:0 0 8px;color:var(--ink-2);font-size:15px}
.step-line{list-style:none;margin:28px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.step-line li{position:relative;padding-top:22px;border-top:2px solid var(--ink)}
.step-line li:first-child{border-top-color:var(--brand)}
.num{display:block;font-size:12px;letter-spacing:.12em;color:var(--brand);font-weight:700;margin-bottom:8px}
.step-line p{margin:0;font-size:14px;color:var(--ink-2)}

/* 场景列表 */
.scene-list{list-style:none;margin:24px 0 0;padding:0}
.scene-list li{
  display:flex;
  align-items:baseline;
  gap:16px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
  font-size:15px;
}
.scene-list li:first-child{border-top:1px solid var(--line)}
.tag{
  flex:none;
  width:52px;
  text-align:center;
  font-size:12px;
  padding:2px 0;
  border:1px solid var(--brand);
  border-radius:4px;
  color:var(--brand);
  letter-spacing:.06em;
}

/* FAQ */
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq details:first-of-type{border-top:1px solid var(--line);margin-top:20px}
.faq summary{
  cursor:pointer;
  list-style:none;
  padding:16px 30px 16px 0;
  position:relative;
  font-weight:600;
  font-size:15px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";
  position:absolute;
  right:4px;
  top:50%;
  width:9px;
  height:9px;
  border-right:2px solid var(--ink-2);
  border-bottom:2px solid var(--ink-2);
  transform:translateY(-70%) rotate(45deg);
  transition:transform .18s ease;
}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq summary:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.faq p{margin:0 0 18px;font-size:14px;color:var(--ink-2);max-width:60ch}

/* 结尾 */
.stream .closing{padding:56px 0 64px}
.closing-card{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:24px 40px;
  padding:34px 32px;
  border:1px solid var(--line);
  border-radius:14px;
  background:
    radial-gradient(420px 200px at 100% 0%,rgba(77,107,254,.10),transparent 70%),
    var(--panel);
  box-shadow:var(--shadow);
}
.closing-copy{max-width:34em}
.closing-copy h2{margin-bottom:8px}
.closing-copy p{margin:0;color:var(--ink-2)}
.closing-actions{display:flex;flex-direction:column;gap:8px;flex:none;min-width:232px}
.closing-actions .cta{width:100%}
.closing-actions .cta-note{margin:0;max-width:20em;font-size:12px;color:var(--ink-2)}

.foot{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:8px 24px;
  padding:26px 0 40px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--ink-2);
}
.foot p{margin:0}
.foot-note{margin:0;color:#8a93ab}

@media (max-width:768px){
  .shell{grid-template-columns:1fr}
  .console{
    position:static;
    height:auto;
    border-right:none;
    border-bottom:1px solid var(--line);
    padding:28px 20px;
    gap:20px;
  }
  .toc{flex-direction:row;flex-wrap:wrap;gap:4px 18px}
  .stream{padding:0 20px}
  .stream section{padding:48px 0}
  .stage{height:auto;padding:24px 16px;display:flex;flex-direction:column;gap:14px}
  .stage-note{position:static;width:100%;transform:none}
  .cap-list{grid-template-columns:1fr;gap:0}
  .step-line{grid-template-columns:1fr;gap:20px}
  .scene-list li{gap:12px}
  .closing-card{padding:26px 20px}
  .closing-actions{width:100%}
  .closing-actions .cta{width:100%}
  .foot{flex-direction:column;gap:6px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important}
}