:root {
  --ink: #15201c;
  --muted: #60706a;
  --line: #d9e2de;
  --paper: #f7f8f5;
  --white: #ffffff;
  --green: #176a4d;
  --green-dark: #0f4e3a;
  --gold: #c9912b;
  --blue: #286a8d;
  --shadow: 0 20px 60px rgba(21, 32, 28, 0.12);
  font-family:
    "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-bottom: 44px;
  background: var(--paper);
  color: var(--ink);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 16px clamp(20px, 4vw, 56px);
  background: rgba(247, 248, 245, 0.9);
  border-bottom: 1px solid rgba(217, 226, 222, 0.75);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 8px;
  background: var(--green);
  color: var(--white);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a:hover {
  background: var(--white);
  color: var(--green);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: clamp(44px, 7vw, 96px) clamp(20px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  margin: 10px 0 18px;
  font-size: clamp(52px, 7vw, 104px);
  line-height: 0.98;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0;
  color: var(--gold);
  font-size: 14px;
  font-weight: 800;
}

.hero-lede,
.section-heading p,
.decision-copy p,
.security-section p,
.contact-section p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--green);
  border-radius: 8px;
  font-weight: 700;
}

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

.button.ghost {
  color: var(--green);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 38px 0 0;
}

.hero-stats div {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.hero-stats dt {
  color: var(--green-dark);
  font-size: 28px;
  font-weight: 850;
}

.hero-stats dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.hero-visual,
.deck-card,
.security-section img {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-visual img {
  width: 100%;
  height: min(66vh, 620px);
  object-fit: cover;
  object-position: center;
}

.section {
  padding: clamp(64px, 8vw, 112px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 36px;
}

.section-heading h2,
.decision-copy h2,
.security-section h2,
.contact-section h2 {
  margin: 10px 0 12px;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.12;
  letter-spacing: 0;
}

.pain-grid,
.feature-grid,
.roadmap {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.pain-grid article,
.feature-grid article,
.timeline article,
.roadmap article,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.pain-grid article,
.feature-grid article,
.roadmap article {
  padding: 24px;
}

.pain-grid span,
.timeline span {
  color: var(--gold);
  font-weight: 850;
}

h3 {
  margin: 10px 0 10px;
  font-size: 21px;
  letter-spacing: 0;
}

article p,
.check-list {
  color: var(--muted);
  line-height: 1.75;
}

.system-section,
.custom-section,
.contact-section {
  background: var(--white);
}

.capability-layout,
.decision-section,
.security-section,
.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}

.capability-stack {
  display: grid;
  gap: 14px;
}

.capability-stack article {
  padding: 24px;
  border-left: 4px solid var(--green);
  border-radius: 8px;
  background: #eef4ef;
}

.capability-stack strong {
  color: var(--blue);
}

.deck-card {
  margin: 0;
}

.deck-card figcaption {
  padding: 12px 16px;
  color: var(--muted);
  font-size: 13px;
}

.features-section {
  background: #edf3f0;
}

.feature-grid article {
  min-height: 180px;
}

.decision-section {
  border-top: 1px solid var(--line);
}

.check-list {
  display: grid;
  gap: 10px;
  padding-left: 20px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.timeline article {
  padding: 22px;
}

.security-section {
  background: #12231d;
  color: var(--white);
}

.security-section .eyebrow {
  color: #e2b95a;
}

.security-section p {
  color: #c4d3ce;
}

.security-section img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  object-position: center;
}

.roadmap-section {
  background: #f6f1e7;
}

.roadmap time {
  color: var(--green);
  font-weight: 850;
}

.contact-section {
  border-top: 1px solid var(--line);
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 168px;
  gap: 22px;
  align-items: center;
  padding: 28px;
}

.contact-info {
  display: grid;
  gap: 12px;
}

.wechat-card {
  display: grid;
  gap: 10px;
  justify-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f9fbf8;
}

.wechat-card img {
  width: 144px;
  aspect-ratio: 1;
  border-radius: 8px;
  object-fit: cover;
}

.wechat-card span {
  color: var(--muted);
  font-size: 13px;
 }

.contact-card strong {
  font-size: 22px;
}

.contact-card a {
  color: var(--green);
  font-weight: 800;
}

.contact-card span {
  color: var(--muted);
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer a:hover {
  color: var(--green);
}

.fixed-icp {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 44px;
  padding: 8px 18px;
  border-top: 1px solid rgba(217, 226, 222, 0.85);
  background: rgba(255, 255, 255, 0.94);
  color: var(--muted);
  font-size: 13px;
  backdrop-filter: blur(14px);
}

.fixed-icp a {
  color: var(--green);
  font-weight: 700;
}

.fixed-icp a:hover {
  color: var(--green-dark);
}

@media (max-width: 920px) {
  .site-nav {
    position: absolute;
    top: 76px;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero,
  .capability-layout,
  .decision-section,
  .security-section,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-visual img {
    height: auto;
    max-height: none;
  }

  .pain-grid,
  .feature-grid,
  .roadmap,
  .timeline {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  body {
    padding-bottom: 62px;
  }

  .site-header {
    min-height: 68px;
  }

  .fixed-icp {
    flex-direction: column;
    gap: 2px;
    min-height: 62px;
    text-align: center;
  }

  .contact-card {
    grid-template-columns: 1fr;
  }

  .wechat-card {
    justify-self: start;
    width: 168px;
  }

  .site-nav {
    top: 68px;
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .hero-lede,
  .section-heading p,
  .decision-copy p,
  .security-section p,
  .contact-section p {
    font-size: 16px;
  }
}