.page-home {
  background: var(--white);
  color: var(--ink-900);
}

.page-home a {
  color: inherit;
  text-decoration: none;
}

.page-home h2 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.5rem, 4.2vw, 2.25rem);
  line-height: 1.22;
  letter-spacing: 0.04em;
}

.page-home h3 {
  margin: 0 0 var(--sp-1);
  font-size: var(--fs-18);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

.page-home #lane-a,
.page-home #lane-b,
.page-home #lane-c,
.page-home #steps,
.page-home #versions,
.page-home #routes {
  scroll-margin-top: 120px;
}

/* ---------- 首屏框景 ---------- */
.page-home .hero {
  position: relative;
  overflow: hidden;
  padding: var(--sp-5) 0 var(--sp-6);
  background: var(--ink-900);
  color: var(--white);
}

.page-home .hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(102deg, transparent 0 44px, rgba(0, 194, 199, 0.10) 44px 46px);
  pointer-events: none;
}

.page-home .hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border: 1px solid rgba(140, 235, 234, 0.22);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-home .hero__grid {
  position: relative;
  display: grid;
  gap: var(--sp-4);
}

.page-home .hero__kicker {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.page-home .hero h1 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(1.95rem, 7vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: 0.04em;
}

.page-home .hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.78);
}

.page-home .hero__jump {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-home .hero__jump a {
  display: flex;
  align-items: baseline;
  gap: var(--sp-2);
  padding: 10px 0;
  border-bottom: 1px solid rgba(140, 235, 234, 0.18);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-home .hero__jump a:hover,
.page-home .hero__jump a:focus-visible {
  color: var(--cyan-200);
  padding-left: 6px;
}

.page-home .hero__jump-idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--cyan-500);
}

.page-home .hero__jump-txt {
  font-size: var(--fs-16);
}

.page-home .hero__frame {
  position: relative;
  padding: 10px;
  border: 1px solid var(--hairline-cyan);
  background: rgba(0, 194, 199, 0.06);
  clip-path: polygon(
    0 0,
    calc(100% - var(--notch)) 0,
    100% var(--notch),
    100% 100%,
    var(--notch) 100%,
    0 calc(100% - var(--notch))
  );
}

.page-home .hero__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--ink-700);
}

.page-home .hero__legend {
  list-style: none;
  margin: 0;
  padding: var(--sp-2) 0 0;
  display: grid;
  gap: 6px;
}

.page-home .hero__legend li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: var(--fs-14);
  color: rgba(255, 255, 255, 0.82);
}

.page-home .hero__legend-idx {
  flex: none;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--ink-900);
  background: var(--cyan-500);
}

@media (min-width: 560px) {
  .page-home .hero__legend {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-2);
  }
  .page-home .hero__legend li {
    flex-direction: column;
    gap: 6px;
    font-size: var(--fs-12);
    line-height: 1.5;
  }
}

@media (min-width: 900px) {
  .page-home .hero {
    padding: var(--sp-6) 0 var(--sp-7);
  }
  .page-home .hero__grid {
    grid-template-columns: 5fr 6fr;
    gap: var(--sp-5);
    align-items: start;
  }
  .page-home .hero__lead {
    font-size: var(--fs-18);
  }
}

/* ---------- 常用三栏 ---------- */
.page-home .lanes {
  padding: var(--sp-6) 0;
}

.page-home .lanes__head {
  max-width: 46rem;
}

.page-home .lanes__fig {
  margin: var(--sp-4) 0 0;
}

.page-home .lanes__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 760;
  object-fit: cover;
  background: var(--paper-100);
  clip-path: polygon(
    0 0,
    calc(100% - var(--notch)) 0,
    100% var(--notch),
    100% 100%,
    var(--notch) 100%,
    0 calc(100% - var(--notch))
  );
}

.page-home .lanes__fig figcaption {
  margin-top: var(--sp-1);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--slate-500);
}

.page-home .lanes__grid {
  display: grid;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.page-home .lane {
  position: relative;
  padding: var(--sp-3) var(--sp-3) var(--sp-4);
  background: var(--paper-100);
  clip-path: polygon(
    0 0,
    calc(100% - var(--notch)) 0,
    100% var(--notch),
    100% 100%,
    var(--notch) 100%,
    0 calc(100% - var(--notch))
  );
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-home .lane__idx {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--slate-500);
}

.page-home .lane__idx::before {
  content: "";
  flex: none;
  width: 20px;
  height: 2px;
  background: var(--cyan-500);
}

.page-home .lane--b .lane__idx::before {
  background: var(--amber-500);
}

.page-home .lane__body {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--ink-700);
}

.page-home .lane__list {
  margin: 0 0 var(--sp-3);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-home .lane__list li {
  position: relative;
  padding-left: 18px;
  font-size: var(--fs-14);
  line-height: 1.65;
  color: var(--ink-700);
}

.page-home .lane__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--cyan-500);
  transform: rotate(45deg);
}

.page-home .lane__tags {
  list-style: none;
  margin: 0 0 var(--sp-3);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-home .lane__thumb {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  margin-bottom: var(--sp-3);
  border: 1px solid rgba(11, 18, 32, 0.08);
}

.page-home .lane__hint {
  margin: 0 0 var(--sp-2);
  padding-top: var(--sp-2);
  border-top: 1px dashed var(--hairline);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--slate-500);
}

.page-home .lane__go {
  display: inline-block;
  padding-bottom: 2px;
  font-size: var(--fs-14);
  font-weight: 700;
  border-bottom: 2px solid var(--amber-500);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-home .lane__go:hover,
.page-home .lane__go:focus-visible {
  color: var(--ink-700);
  border-bottom-color: var(--cyan-500);
}

.page-home .copy-slot {
  margin-bottom: var(--sp-3);
}

@media (hover: hover) {
  .page-home .lane:hover {
    transform: translateY(-2px);
    background: var(--paper-200);
  }
}

@media (min-width: 900px) {
  .page-home .lanes__grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
    gap: var(--sp-3);
  }
  .page-home .lane--b {
    margin-top: 32px;
  }
  .page-home .lane--c {
    margin-top: 64px;
  }
}

/* ---------- 四步 ---------- */
.page-home .steps {
  padding: var(--sp-5) 0;
  background: var(--paper-100);
}

.page-home .steps__list {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-3);
  counter-reset: none;
}

.page-home .step {
  position: relative;
  padding-top: var(--sp-2);
  border-top: 2px solid var(--cyan-200);
}

.page-home .step__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--slate-500);
}

.page-home .step h3 {
  font-size: var(--fs-16);
  margin-bottom: 6px;
}

.page-home .step p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ink-700);
}

@media (min-width: 760px) {
  .page-home .steps__list {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-3) var(--sp-4);
  }
}

@media (min-width: 1020px) {
  .page-home .steps__list {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 版本轨道 ---------- */
.page-home .versions {
  padding: var(--sp-6) 0;
}

.page-home .versions .lead {
  max-width: 44rem;
}

.page-home .versions__fig {
  margin: var(--sp-4) 0 0;
}

.page-home .versions__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 600;
  object-fit: cover;
  background: var(--paper-100);
}

.page-home .vrail {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-4);
}

.page-home .vrail__node {
  position: relative;
  padding-left: var(--sp-3);
  border-left: 2px solid var(--paper-200);
}

.page-home .vrail__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-500);
}

.page-home .vrail__node--current {
  border-left-color: var(--amber-500);
}

.page-home .vrail__node--current::before {
  background: var(--amber-500);
}

.page-home .vrail__ver {
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--slate-500);
}

.page-home .vrail__node p {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--ink-700);
}

.page-home .vrail__go {
  display: inline-block;
  padding-bottom: 2px;
  font-size: var(--fs-14);
  font-weight: 700;
  border-bottom: 2px solid var(--cyan-500);
  transition: border-color var(--dur) var(--ease);
}

.page-home .vrail__go:hover,
.page-home .vrail__go:focus-visible {
  border-bottom-color: var(--amber-500);
}

@media (min-width: 860px) {
  .page-home .vrail {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-4);
  }
  .page-home .vrail__node {
    padding-left: 0;
    padding-top: var(--sp-3);
    border-left: 0;
    border-top: 2px solid var(--paper-200);
  }
  .page-home .vrail__node::before {
    left: 0;
    top: -5px;
  }
  .page-home .vrail__node--current {
    border-top-color: var(--amber-500);
  }
}

/* ---------- 分流入口 ---------- */
.page-home .routes {
  padding: var(--sp-6) 0;
  background: var(--ink-700);
  color: var(--white);
}

.page-home .routes .eyebrow {
  color: var(--cyan-200);
}

.page-home .routes h2 {
  color: var(--white);
  max-width: 40rem;
}

.page-home .routes__grid {
  display: grid;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

.page-home .route {
  display: flex;
  flex-direction: column;
  padding: var(--sp-3);
  border: 1px solid rgba(140, 235, 234, 0.22);
  background: rgba(255, 255, 255, 0.04);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-home .route__idx {
  margin-bottom: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--cyan-500);
}

.page-home .route h3 {
  color: var(--white);
  margin-bottom: 8px;
}

.page-home .route p {
  margin: 0 0 var(--sp-3);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.74);
}

.page-home .route__go {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 2px;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--amber-500);
  border-bottom: 2px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-home .route:hover,
.page-home .route:focus-visible {
  border-color: var(--cyan-500);
  background: rgba(0, 194, 199, 0.10);
}

.page-home .route:hover .route__go,
.page-home .route:focus-visible .route__go {
  border-bottom-color: var(--amber-500);
}

@media (min-width: 720px) {
  .page-home .routes__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .page-home .routes__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-home .lane,
  .page-home .hero__jump a,
  .page-home .lane__go,
  .page-home .vrail__go,
  .page-home .route,
  .page-home .route__go {
    transition: none;
  }
  .page-home .lane:hover {
    transform: none;
  }
}
</main>