/* 首页首屏：负责强排版、制图品牌 C 与五平台状态轨。 */
.home-hero {
  position: relative;
  min-height: 650px;
  padding-block: clamp(64px, 8vw, 104px);
  overflow: hidden;
  border-bottom: 1px solid var(--line-strong);
  background: var(--paper);
}

.home-hero-grid {
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.hero-copy {
  position: relative;
  min-width: 0;
  max-width: 720px;
  padding-left: 56px;
}

.hero-ruler {
  position: absolute;
  top: -28px;
  bottom: -28px;
  left: 0;
  width: 22px;
  border-left: 1px solid var(--line-strong);
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 1px, transparent 1px 18px);
  opacity: 0.72;
}

.hero-ruler::after {
  position: absolute;
  bottom: 0;
  left: -19px;
  color: var(--ink-muted);
  content: "SYSTEM / ARCHITECTURE";
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.08em;
  transform: rotate(180deg);
  writing-mode: vertical-rl;
}

.hero-copy h1 {
  max-width: 690px;
  margin: var(--space-4) 0 var(--space-5);
  font-size: clamp(3rem, 6.2vw, 5rem);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.06em;
}

.hero-lead {
  max-width: 650px;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  line-height: 1.75;
}

.home-hero .action-row {
  margin-top: var(--space-6);
}

.hero-blueprint {
  position: relative;
  display: grid;
  width: min(100%, 500px);
  aspect-ratio: 1;
  margin-left: auto;
  place-items: center;
  border: 1px dashed var(--line-soft);
  background: var(--paper-raised);
}

.blueprint-label {
  position: absolute;
  z-index: 3;
  top: 15px;
  left: 16px;
  color: var(--ink-muted);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.07em;
}

.blueprint-axis {
  position: absolute;
  z-index: 1;
  background: var(--line-soft);
  opacity: 0.7;
}

.blueprint-axis-x {
  top: 50%;
  left: -30px;
  width: calc(100% + 60px);
  height: 1px;
}

.blueprint-axis-y {
  top: -30px;
  left: 50%;
  width: 1px;
  height: calc(100% + 60px);
}

.blueprint-c {
  position: relative;
  z-index: 2;
  display: block;
  width: 66%;
  aspect-ratio: 1;
  border: clamp(24px, 3vw, 36px) solid var(--ink);
  border-right-color: transparent;
  border-radius: 50%;
}

.blueprint-c::after {
  position: absolute;
  inset: 18px;
  border: 2px solid var(--line);
  border-right-color: transparent;
  border-radius: 50%;
  content: "";
}

.blueprint-target {
  position: absolute;
  z-index: 4;
  top: 50%;
  width: 22px;
  height: 22px;
  margin-top: -11px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--paper-raised);
}

.blueprint-target::before,
.blueprint-target::after {
  position: absolute;
  background: var(--accent);
  content: "";
}

.blueprint-target::before {
  top: 8px;
  left: -8px;
  width: 34px;
  height: 2px;
}

.blueprint-target::after {
  top: -8px;
  left: 8px;
  width: 2px;
  height: 34px;
}

.blueprint-target-start {
  left: -12px;
}

.blueprint-target-end {
  right: -12px;
  border-color: var(--line-strong);
}

.blueprint-target-end::before,
.blueprint-target-end::after {
  background: var(--line-strong);
}

.home-platform-rail {
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--line-strong);
  background: var(--paper-alt);
}

.home-platform-grid {
  display: grid;
  min-width: 0;
  grid-template-columns: 128px repeat(5, minmax(0, 1fr));
  gap: var(--space-3);
  align-items: stretch;
}

.home-platform-label {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 740;
  letter-spacing: 0.06em;
}

.home-platform-label i {
  width: 20px;
  height: 2px;
  margin-block: 14px;
  background: var(--accent);
}

.home-platform-label h2 {
  margin: 0;
  font: inherit;
  letter-spacing: inherit;
}

.home-platform-label small {
  color: var(--ink-muted);
}

.home-platform-item {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 142px;
  flex-direction: column;
  padding: var(--space-4);
  border: 1px solid var(--line-strong);
  background: var(--paper-raised);
}

.home-platform-item > strong {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 850;
  line-height: 1;
}

.home-platform-item h3 {
  margin: auto 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.04em;
}

.home-platform-item p,
.home-platform-item small {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.68rem;
  line-height: 1.5;
}

.home-platform-item small {
  margin-top: var(--space-2);
  color: var(--ink-soft);
  font-weight: 700;
}

.platform-led {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink);
}

.home-platform-item-planned {
  border-style: dashed;
  border-color: var(--line-soft);
  color: var(--ink-muted);
}

.home-platform-item-planned .platform-led {
  border: 1px solid var(--line-soft);
  background: transparent;
}

@media (max-width: 960px) {
  .home-hero {
    min-height: 0;
  }

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

  .hero-blueprint {
    width: min(72vw, 430px);
    margin-inline: auto;
  }

  .home-platform-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .home-platform-label {
    grid-column: 1 / -1;
    min-height: 72px;
  }
}

@media (max-width: 720px) {
  .home-hero {
    padding-block: var(--space-7);
  }

  .hero-copy {
    padding-left: 40px;
  }

  .hero-copy h1 {
    font-size: clamp(2.75rem, 13vw, 4rem);
  }

  .hero-blueprint {
    width: min(82vw, 340px);
  }

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

@media (max-width: 420px) {
  .hero-copy {
    padding-left: 30px;
  }

  .hero-ruler::after {
    display: none;
  }

  .hero-blueprint {
    width: min(80vw, 280px);
  }

  .blueprint-axis-x {
    left: -12px;
    width: calc(100% + 24px);
  }

  .blueprint-axis-y {
    top: -12px;
    height: calc(100% + 24px);
  }

  .home-platform-grid {
    grid-template-columns: 1fr;
  }
}