/* ==========================================================
   page-home · 首页专属样式
   作用域全部限定在 .page-home 内
   ========================================================== */

.page-home {
  position: relative;
  overflow-x: hidden;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
}

.page-home img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-home .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-home strong {
  font-weight: 700;
}

/* ---------------- 显现协议 ---------------- */

.page-home .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.34s var(--ease),
    transform 0.46s var(--ease);
}

.page-home .reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------------- 首屏 ---------------- */

.page-home .home-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(1.5rem, 5vw, 3rem) 0 clamp(2.5rem, 7vw, 5rem);
  border-bottom: 2px solid var(--black);
}

.page-home .home-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-home .home-hero__bg img {
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 0.4;
}

.page-home .home-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(125% 95% at 8% 0%, rgba(13, 16, 48, 0.16), rgba(13, 16, 48, 0.96) 74%),
    linear-gradient(180deg, rgba(13, 16, 48, 0.3) 0%, rgba(13, 16, 48, 0.98) 100%);
}

.page-home .home-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.6rem);
}

.page-home .home-coord {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.7rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-home .home-coord__dot {
  width: 8px;
  height: 8px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(44, 232, 216, 0.16);
  flex: 0 0 auto;
}

.page-home .home-coord__sep {
  color: rgba(154, 163, 204, 0.45);
}

.page-home .home-coord__link {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 194, 75, 0.5);
  padding-bottom: 1px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-home .home-coord__link:hover,
.page-home .home-coord__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-home .home-axis {
  display: none;
}

.page-home .home-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 7vw, 4.1rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.01em;
  transform: skewX(-2deg);
  text-wrap: balance;
}

.page-home .home-hero__brand {
  color: var(--cyan);
  text-shadow: 3px 3px 0 var(--black);
}

.page-home .home-hero__lead {
  margin: 1.15rem 0 0;
  max-width: 34em;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  color: rgba(243, 246, 255, 0.86);
}

.page-home .home-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.page-home .home-hero__cards {
  display: grid;
  gap: 0.85rem;
}

.page-home .hero-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 0.1rem 0.85rem;
  padding: 0.95rem 1.1rem 1.05rem;
  background: rgba(23, 27, 74, 0.94);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  color: var(--paper);
  text-decoration: none;
  transition:
    border-color 0.3s var(--ease),
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

.page-home .hero-card__idx {
  grid-row: 1 / 3;
  align-self: start;
  padding-top: 0.32rem;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-home .hero-card__name {
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.page-home .hero-card__desc {
  font-size: 13.5px;
  line-height: 1.62;
  color: var(--mist);
}

.page-home .hero-card:hover,
.page-home .hero-card:focus-visible {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 var(--black);
}

/* ---------------- 章节骨架 ---------------- */

.page-home .home-sec {
  padding: clamp(2.6rem, 7vw, 5rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-home .home-sec--last {
  border-bottom: none;
}

.page-home .home-sec__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem 1.2rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.4rem);
  padding-top: 0.9rem;
  border-top: 2px solid var(--cyan);
}

.page-home .home-sec__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-home .home-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4vw, 2.3rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.005em;
}

.page-home .home-sec__note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-home .home-sec__foot {
  margin: 1.6rem 0 0;
  font-size: 14.5px;
  color: var(--mist);
}

.page-home .home-sec__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 232, 216, 0.45);
}

.page-home .home-sec__foot a:hover,
.page-home .home-sec__foot a:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------------- SEC.01 数据条 ---------------- */

.page-home .home-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--line);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
}

.page-home .home-stat {
  display: grid;
  gap: 0.45rem;
  align-content: start;
  padding: 1.15rem 1rem 1.3rem;
  background: var(--ink-2);
}

.page-home .home-stat::before {
  content: "";
  width: 20px;
  height: 3px;
  background: var(--cyan);
}

.page-home .home-stat:nth-child(3n + 2)::before {
  background: var(--orange);
}

.page-home .home-stat:nth-child(3n)::before {
  background: var(--amber);
}

.page-home .home-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-home .home-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------------- SEC.02 三条线 ---------------- */

.page-home .home-boards {
  display: grid;
  gap: clamp(1.15rem, 3vw, 1.75rem);
}

.page-home .home-board {
  display: grid;
  background: var(--ink-2);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  transition:
    border-color 0.3s var(--ease),
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

.page-home .home-board:hover {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: 10px 10px 0 var(--black);
}

.page-home .home-board--b {
  background: var(--gem-wine);
}

.page-home .home-board--c {
  background: var(--gem-teal);
}

.page-home .home-board__media {
  overflow: hidden;
  border-bottom: 2px solid var(--black);
}

.page-home .home-board__media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.05);
}

.page-home .home-board__body {
  display: grid;
  gap: 0.55rem;
  align-content: start;
  padding: 1.25rem 1.2rem 1.4rem;
}

.page-home .home-board__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-home .home-board__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  font-weight: 800;
  line-height: 1.2;
}

.page-home .home-board__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(243, 246, 255, 0.84);
}

.page-home .home-board__link {
  justify-self: start;
  margin-top: 0.35rem;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(44, 232, 216, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

/* ---------------- SEC.03 第一次来 ---------------- */

.page-home .home-first {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-home .home-first__lead {
  margin: 0 0 1.4rem;
  max-width: 40em;
  font-size: 15.5px;
  color: rgba(243, 246, 255, 0.86);
}

.page-home .home-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-home .home-steps--tight {
  gap: 0.75rem;
}

.page-home .home-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: start;
  gap: 1rem;
}

.page-home .home-step__num {
  display: grid;
  place-items: center;
  height: 46px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--mist);
  background: var(--ink);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-soft);
}

.page-home .home-step p {
  margin: 0;
  padding-top: 0.55rem;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(243, 246, 255, 0.88);
}

.page-home .home-step.is-current .home-step__num {
  background: var(--cyan);
  color: var(--black);
}

.page-home .home-step.is-done .home-step__num {
  background: var(--orange);
  color: var(--black);
}

.page-home .home-first__aside {
  align-self: start;
  padding: 1.5rem 1.35rem 1.6rem;
  background: var(--gem-wine);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
}

.page-home .home-first__aside-title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.page-home .home-flaglist {
  list-style: none;
  margin: 0 0 1.4rem;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-home .home-flaglist li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(243, 246, 255, 0.86);
}

.page-home .home-flaglist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 14px;
  height: 2px;
  background: var(--cyan);
}

/* ---------------- SEC.04 两条通道 ---------------- */

.page-home .home-channels {
  display: grid;
  gap: clamp(1.1rem, 3vw, 1.6rem);
}

.page-home .home-channel {
  display: grid;
  align-content: start;
  gap: 0.75rem;
  padding: 1.5rem 1.35rem 1.6rem;
  background: var(--ink-2);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.3s var(--ease);
}

.page-home .home-channel--web {
  background: var(--gem-teal);
}

.page-home .home-channel:hover {
  border-color: var(--cyan);
}

.page-home .home-channel .tag {
  justify-self: start;
}

.page-home .home-channel__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 800;
  line-height: 1.25;
}

.page-home .home-channel__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 246, 255, 0.85);
}

.page-home .home-channel__link {
  justify-self: start;
  margin-top: 0.2rem;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(44, 232, 216, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

/* ---------------- SEC.05 近路 ---------------- */

.page-home .home-shortcuts {
  display: grid;
  gap: clamp(1.15rem, 3vw, 1.75rem);
}

.page-home .home-shortcut {
  position: relative;
  display: grid;
  align-content: start;
  gap: 0.7rem;
  padding: 1.5rem 1.35rem 1.6rem 1.6rem;
  background: var(--ink-2);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
}

.page-home .home-shortcut::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.5rem;
  bottom: 1.6rem;
  width: 5px;
  background: var(--cyan);
}

.page-home .home-shortcut--step::before {
  background: var(--orange);
}

.page-home .home-shortcut__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-home .home-shortcut__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.32rem);
  font-weight: 800;
  line-height: 1.28;
}

.page-home .home-shortcut__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 246, 255, 0.85);
}

.page-home .home-shortcut__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* ---------------- SEC.06 内容索引 ---------------- */

.page-home .home-index {
  display: grid;
  gap: 1rem;
}

.page-home .home-index__item {
  display: grid;
  align-content: start;
  gap: 0.55rem;
  padding: 1.35rem 1.25rem 1.45rem;
  background: var(--ink-2);
  border: 2px solid var(--black);
  box-shadow: var(--shadow-hard);
  color: var(--paper);
  text-decoration: none;
  transition:
    border-color 0.3s var(--ease),
    transform 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

.page-home .home-index__item:hover,
.page-home .home-index__item:focus-visible {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 var(--black);
}

.page-home .home-index__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-home .home-index__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 800;
  line-height: 1.3;
}

.page-home .home-index__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-home .home-index__go {
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(243, 246, 255, 0.72);
}

/* ---------------- 收尾编号带 ---------------- */

.page-home .home-outro {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-top: 2px solid var(--black);
}

.page-home .home-outro::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -2px;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--cyan) 32%, var(--orange) 68%, transparent 100%);
  z-index: 3;
}

.page-home .home-outro__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-home .home-outro__media img {
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 0.34;
}

.page-home .home-outro::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(13, 16, 48, 0.82) 0%, rgba(13, 16, 48, 0.98) 100%);
  pointer-events: none;
}

.page-home .home-outro__inner {
  position: relative;
  z-index: 2;
  padding: clamp(2.6rem, 7vw, 4.5rem) 0;
}

.page-home .home-outro__box {
  display: grid;
  gap: 0.8rem;
  max-width: 46rem;
}

.page-home .home-outro__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-home .home-outro__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.16;
  transform: skewX(-2deg);
}

.page-home .home-outro__text {
  margin: 0;
  font-size: 15px;
  color: rgba(243, 246, 255, 0.84);
}

.page-home .home-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
  margin-top: 0.6rem;
}

.page-home .home-outro__links a {
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(44, 232, 216, 0.4);
  padding-bottom: 2px;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-home .home-outro__links a:hover,
.page-home .home-outro__links a:focus-visible {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------------- 焦点可见性 ---------------- */

.page-home a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ==========================================================
   响应式
   ========================================================== */

@media (min-width: 700px) {
  .page-home .home-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-home .home-boards {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1.5rem 1.5rem;
  }

  .page-home .home-board--a {
    grid-column: 1 / 8;
  }

  .page-home .home-board--b {
    grid-column: 8 / 13;
    margin-top: 2.75rem;
  }

  .page-home .home-board--c {
    grid-column: 3 / 12;
    margin-top: 0.5rem;
  }

  .page-home .home-first {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.9fr);
    align-items: start;
    gap: 2rem;
  }

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

  .page-home .home-shortcuts {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-home .home-hero__inner {
    grid-template-columns: 58px minmax(0, 1.05fr) minmax(0, 0.92fr);
    grid-template-areas:
      "coord coord coord"
      "axis  copy  cards";
    align-items: start;
    gap: 2.5rem 2.25rem;
  }

  .page-home .home-coord {
    grid-area: coord;
  }

  .page-home .home-axis {
    grid-area: axis;
    display: block;
    position: relative;
    align-self: stretch;
    min-height: 320px;
    border-left: 1px solid var(--line);
  }

  .page-home .home-axis::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: repeating-linear-gradient(180deg, var(--cyan) 0 8px, transparent 8px 32px);
    opacity: 0.55;
  }

  .page-home .home-axis__label {
    position: absolute;
    left: 0.85rem;
    bottom: 0;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--mist);
  }

  .page-home .home-hero__copy {
    grid-area: copy;
  }

  .page-home .home-hero__cards {
    grid-area: cards;
    gap: 1rem;
    padding-top: 0.5rem;
  }

  .page-home .home-hero__cards .hero-card:nth-child(2) {
    margin-left: 2rem;
  }

  .page-home .home-hero__cards .hero-card:nth-child(3) {
    margin-left: 4rem;
  }
}

@media (min-width: 1200px) {
  .page-home .home-hero__lead {
    font-size: 1.1rem;
  }
}

/* ---------------- 减少动效 ---------------- */

@media (prefers-reduced-motion: reduce) {
  .page-home .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.18s linear;
  }

  .page-home .hero-card,
  .page-home .home-board,
  .page-home .home-index__item,
  .page-home .home-channel {
    transition: border-color 0.18s linear;
  }

  .page-home .hero-card:hover,
  .page-home .home-board:hover,
  .page-home .home-index__item:hover {
    transform: none;
    box-shadow: var(--shadow-hard);
  }

  .page-home .home-hero__title,
  .page-home .home-outro__title {
    transform: none;
  }
}