:root {
  --ink: #162127;
  --muted: #5d6b70;
  --line: #d8e0df;
  --paper: #ffffff;
  --soft: #f3f6f4;
  --deep: #102f3a;
  --teal: #18756f;
  --teal-soft: #dcece8;
  --amber: #c8872b;
  --amber-soft: #f7ead4;
  --blue: #326ea3;
  --blue-soft: #e4edf5;
  --content: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 82px; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
.shell { width: min(calc(100% - 48px), var(--content)); margin: 0 auto; }
.eyebrow { margin: 0 0 12px; color: #8ed6c9; font-size: 13px; font-weight: 800; text-transform: uppercase; }

.case-header {
  position: fixed;
  z-index: 10;
  top: 0;
  left: 0;
  width: 100%;
  color: #fff;
  background: rgba(16, 47, 58, 0.96);
  border-bottom: 1px solid rgba(255,255,255,.16);
  backdrop-filter: blur(14px);
}
.nav {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 20px;
  font-weight: 800;
}
.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--deep);
  background: #fff;
  border-radius: 6px;
}
.nav-links { display: flex; align-items: center; gap: 18px; }
.nav-links a { color: rgba(255,255,255,.84); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: #fff; }

.hero {
  position: relative;
  color: #fff;
  background: #102f3a;
  padding: 150px 0 88px;
}
.hero-next {
  position: absolute;
  top: 96px;
  right: max(24px, calc((100% - var(--content)) / 2));
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  color: #fff;
  border: 1px solid rgba(255,255,255,.42);
  border-radius: 6px;
  background: rgba(255,255,255,.08);
  text-decoration: none;
  font-size: 13px;
  font-weight: 800;
}
.hero-next:hover { background: rgba(255,255,255,.16); }
.hero-layout {
  display: grid;
  grid-template-columns: 1fr 390px;
  gap: 72px;
  align-items: end;
}
.hero h1 { margin: 0; max-width: 760px; font-size: 52px; line-height: 1.08; font-weight: 820; }
.hero-lead { margin: 24px 0 0; max-width: 740px; color: rgba(255,255,255,.78); font-size: 18px; line-height: 1.75; }
.hero-meta {
  display: grid;
  gap: 1px;
  background: rgba(255,255,255,.22);
  border: 1px solid rgba(255,255,255,.22);
}
.hero-meta div { padding: 18px; background: rgba(255,255,255,.08); }
.hero-meta strong { display: block; color: #8ed6c9; font-size: 13px; }
.hero-meta span { display: block; margin-top: 6px; color: rgba(255,255,255,.82); font-size: 14px; line-height: 1.55; }

section { padding: 82px 0; }
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 70px;
  align-items: start;
}
h2 { margin: 0; color: var(--deep); font-size: 34px; line-height: 1.2; }
.section-copy { margin: 14px 0 0; color: var(--muted); font-size: 16px; line-height: 1.8; }

.phone {
  position: sticky;
  top: 92px;
  padding: 26px;
  color: #fff;
  background: #1c272c;
  border-radius: 8px;
}
.phone-label { margin: 0 0 18px; color: #8ed6c9; font-size: 13px; font-weight: 800; }
.bubble { max-width: 90%; margin-bottom: 13px; padding: 12px 14px; border-radius: 7px; font-size: 14px; line-height: 1.58; }
.bubble-user { margin-left: auto; color: var(--deep); background: #fff; }
.bubble-agent { background: #244f5b; }
.bubble-agent strong { color: #9ce1d4; }
.phone-note { margin: 22px 0 0; color: rgba(255,255,255,.62); font-size: 12px; line-height: 1.6; }

.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 30px;
  background: var(--line);
  border: 1px solid var(--line);
}
.panel { min-height: 190px; padding: 24px; background: #fff; }
a.panel { display: block; text-decoration: none; }
a.panel:hover strong { color: var(--teal); }
.panel strong { display: block; color: var(--deep); font-size: 17px; }
.panel p { margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.72; }

.flow { background: var(--soft); }
.flow-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.flow-step { min-height: 210px; padding: 24px; background: #fff; }
.flow-step span { color: var(--amber); font-size: 13px; font-weight: 800; }
.flow-step strong { display: block; margin-top: 24px; color: var(--deep); font-size: 17px; }
.flow-step p { margin: 10px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.evidence { background: #fff; }
.evidence-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.evidence-card {
  padding: 28px;
  background: #fbf6ed;
  border-left: 4px solid var(--amber);
}
.evidence-card strong { display: block; color: var(--deep); font-size: 18px; }
.evidence-card p, .evidence-card li { color: #6b583b; font-size: 14px; line-height: 1.72; }
.evidence-card ul { margin: 16px 0 0; padding-left: 18px; }
.source-list { margin: 22px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.source-list a { color: var(--blue); text-decoration: none; font-weight: 700; }
.source-list a:hover { text-decoration: underline; }

.cta { padding: 60px 0; background: var(--amber-soft); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  color: #fff;
  background: var(--deep);
  border-radius: 6px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
}

footer { padding: 28px 0; color: var(--muted); background: #fff; font-size: 12px; }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; }

@media (max-width: 900px) {
  .shell { width: min(calc(100% - 36px), var(--content)); }
  .hero-layout, .split, .evidence-layout { grid-template-columns: 1fr; gap: 36px; }
  .hero h1 { font-size: 42px; }
  .hero-next {
    position: static;
    width: min(calc(100% - 36px), var(--content));
    margin: 0 auto 24px;
  }
  .phone { position: static; }
  .flow-list { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .shell { width: calc(100% - 28px); }
  .nav { min-height: 62px; }
  .nav-links a:not(:last-child) { display: none; }
  .brand { font-size: 18px; }
  .hero { padding: 118px 0 64px; }
  .hero h1 { font-size: 34px; line-height: 1.14; }
  .hero-lead { font-size: 16px; }
  section { padding: 62px 0; }
  h2 { font-size: 28px; }
  .panel-grid, .flow-list { grid-template-columns: 1fr; }
  .flow-step, .panel { min-height: 0; }
  .cta-inner, .footer-inner { display: grid; }
  .button { width: 100%; }
}