:root {
  --ink: #102033;
  --muted: #5d7183;
  --line: #dce7f0;
  --paper: #ffffff;
  --wash: #f5f9fc;
  --navy: #0f2a43;
  --blue: #2f7fe8;
  --green: #1f9b73;
  --amber: #d88a20;
  --coral: #d85263;
  --shadow: 0 18px 50px rgba(16, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--wash);
  color: var(--ink);
  font-family:
    Inter, "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 6vw;
  border-bottom: 1px solid rgba(220, 231, 240, 0.85);
  background: rgba(245, 249, 252, 0.9);
  backdrop-filter: blur(18px);
}

.brand,
.nav,
.hero-actions,
.process-line,
.footer p {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  background: var(--navy);
  color: white;
  font-size: 13px;
}

.nav {
  gap: 28px;
  color: var(--muted);
  font-size: 15px;
}

.nav a:hover {
  color: var(--blue);
}

.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 92px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  align-items: center;
  min-height: calc(100vh - 72px);
  gap: 64px;
  padding-top: 68px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(44px, 8vw, 88px);
  line-height: 1.04;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.12;
}

h3 {
  margin-bottom: 10px;
  font-size: 22px;
  line-height: 1.25;
}

.lead {
  max-width: 650px;
  color: #33495c;
  font-size: 22px;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.button.primary {
  border-color: var(--navy);
  background: var(--navy);
  color: white;
}

.button.ghost {
  background: white;
}

.signal-panel {
  display: grid;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(47, 127, 232, 0.08), transparent 42%),
    var(--paper);
  box-shadow: var(--shadow);
}

.metric {
  padding: 24px;
  border: 1px solid #e2ebf3;
  border-radius: 8px;
  background: #fbfdff;
}

.metric span {
  display: block;
  color: var(--navy);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
}

.metric p {
  margin: 10px 0 0;
  color: var(--muted);
}

.metric.accent span {
  color: var(--coral);
}

.intro {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  border-top: 1px solid var(--line);
}

.deliverables {
  display: grid;
  gap: 16px;
}

.deliverables article {
  position: relative;
  padding: 24px 24px 24px 58px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.deliverables p,
.section-heading p,
.case-body p,
.system-copy p,
.resume-section p {
  color: var(--muted);
}

.dot {
  position: absolute;
  top: 31px;
  left: 24px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
}

.dot.blue {
  background: var(--blue);
}

.dot.green {
  background: var(--green);
}

.dot.amber {
  background: var(--amber);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.case-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: 0 14px 36px rgba(16, 32, 51, 0.08);
}

.case-card.featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
}

.evidence-card {
  background: #fbfdff;
}

.case-card img,
.placeholder-visual {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #eaf2f8;
}

.case-card.featured img {
  height: 100%;
  aspect-ratio: auto;
}

.case-body {
  padding: 28px;
}

.case-label {
  margin-bottom: 10px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 900;
}

.case-body ul {
  margin: 22px 0 0;
  padding-left: 20px;
  color: #42596d;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}

.result-grid span {
  display: grid;
  gap: 4px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f6f9fc;
  color: var(--muted);
  font-size: 13px;
}

.result-grid strong {
  color: var(--ink);
  font-size: 24px;
  line-height: 1;
}

.flow-case {
  grid-column: 1 / -1;
}

.flow-board {
  padding: 28px;
  background:
    linear-gradient(135deg, rgba(47, 127, 232, 0.08), transparent 44%),
    #f7fbff;
}

.flow-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  padding: 22px;
  border-radius: 8px;
  background: var(--navy);
  color: white;
}

.flow-head span {
  color: #9fc5e8;
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.flow-head strong {
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.12;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.flow-step {
  min-height: 168px;
  padding: 18px;
  border: 1px solid #d9e7f2;
  border-radius: 8px;
  background: white;
  box-shadow: 0 10px 24px rgba(16, 32, 51, 0.06);
}

.flow-step b {
  display: inline-grid;
  width: 42px;
  height: 34px;
  margin-bottom: 16px;
  place-items: center;
  border-radius: 8px;
  background: var(--blue);
  color: white;
  font-size: 14px;
}

.flow-step:nth-child(2) b,
.flow-step:nth-child(6) b {
  background: var(--green);
}

.flow-step:nth-child(3) b,
.flow-step:nth-child(7) b {
  background: var(--amber);
}

.flow-step:nth-child(4) b,
.flow-step:nth-child(8) b {
  background: var(--coral);
}

.flow-step strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}

.flow-step p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.placeholder-visual {
  display: grid;
  align-content: center;
  gap: 12px;
  padding: 38px;
  background:
    linear-gradient(135deg, rgba(31, 155, 115, 0.14), transparent),
    #f5fbf8;
}

.placeholder-visual.warm {
  background:
    linear-gradient(135deg, rgba(216, 138, 32, 0.16), transparent),
    #fffaf1;
}

.placeholder-visual span {
  font-size: 30px;
  font-weight: 900;
}

.placeholder-visual p {
  max-width: 440px;
  margin: 0;
  color: var(--muted);
}

.system-section {
  display: grid;
  grid-template-columns: 0.88fr 1.12fr;
  gap: 44px;
  align-items: center;
  border-top: 1px solid var(--line);
}

.system-section img {
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.process-line {
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.process-line span {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: #345166;
  font-size: 14px;
  font-weight: 700;
}

.resume-section {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 44px;
  border-top: 1px solid var(--line);
}

.resume-links {
  display: grid;
  gap: 12px;
}

.resume-links a {
  display: grid;
  gap: 6px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}

.resume-links a:hover {
  border-color: rgba(47, 127, 232, 0.45);
  box-shadow: 0 10px 24px rgba(16, 32, 51, 0.08);
}

.resume-links span {
  color: var(--muted);
  font-size: 14px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 34px 6vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer p {
  gap: 18px;
  margin: 0;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .site-header {
    padding: 0 20px;
  }

  .nav {
    gap: 16px;
  }

  .section {
    width: min(100% - 28px, 1120px);
    padding: 64px 0;
  }

  .hero,
  .intro,
  .system-section,
  .resume-section,
  .case-card.featured {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 34px;
    min-height: auto;
    padding-top: 54px;
  }

  .lead {
    font-size: 19px;
  }

  .case-grid {
    grid-template-columns: 1fr;
  }

  .flow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer {
    display: grid;
  }
}

@media (max-width: 560px) {
  .brand span:last-child {
    display: none;
  }

  .nav {
    font-size: 14px;
  }

  h1 {
    font-size: 48px;
  }

  .metric span {
    font-size: 34px;
  }

  .case-body,
  .placeholder-visual,
  .flow-board {
    padding: 22px;
  }

  .result-grid,
  .flow-grid {
    grid-template-columns: 1fr;
  }

  .flow-head {
    align-items: start;
    flex-direction: column;
  }
}