/* =========================================================
   Homepage hero —— 首页开场
   入口：_config.butterfly.yml -> inject.head
   作用域仅 #page-header.full_page，其它页面零影响
   ---------------------------------------------------------
   设计主张：一个视觉资产（结构图）+ 巨大而安静的标题。
   不用霓虹、不用渐变文字、不用打字机。
   ========================================================= */

#page-header.full_page {
  --hero-ink: #0b1116;
  --hero-paper: #f4f7f8;
  --hero-accent: #4ea8de;
  --hero-fade: 1;
  --hero-shift: 0px;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  isolation: isolate;
  background-color: var(--hero-ink);
}

/* 底图彻底退成暗场，只留极淡的顶部空气光 */
#page-header.full_page:before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(120% 80% at 76% 8%, rgba(78, 168, 222, 0.13), transparent 58%),
    linear-gradient(180deg, #0b1116 0%, #0a1015 62%, #080d11 100%);
}

/* ---------- 舞台 ---------- */
#page-header.full_page #site-info {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  max-width: 1440px;
  margin-inline: auto;
  padding: 0 clamp(24px, 5vw, 80px);
  text-align: left;
  opacity: var(--hero-fade);
  transform: translate3d(0, var(--hero-shift), 0);
  will-change: transform, opacity;
}

/* 三维点云画布 */
.hero-scene {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#page-header.full_page #site-subtitle {
  display: none;
}

/* 开场页不重复导航里的站点名，只留标识 */
#page-header.full_page #nav .site-name {
  display: none;
}

/* ---------- 左栏文案 ---------- */
.hero-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
  max-width: min(620px, 100%);
}

#page-header.full_page #site-title {
  display: block;
  max-width: 100%;
  margin: 0;
  overflow: visible;
  color: var(--hero-paper);
  font-size: clamp(2.2rem, min(7.2vw, 11vh), 6.2rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.032em;
  text-align: left;
  text-shadow: none;
  -webkit-line-clamp: unset;
  text-wrap: balance;
  animation: hero-rise 0.95s cubic-bezier(0.19, 1, 0.22, 1) 0.15s both;
}

.hero-prelude {
  display: block;
  margin-bottom: 0.85em;
  color: rgba(244, 247, 248, 0.5);
  font-size: clamp(0.82rem, 1.35vw, 1rem);
  font-weight: 400;
  letter-spacing: 0.14em;
  line-height: 1.2;
}

.hero-name {
  display: block;
}

.hero-lede {
  max-width: 26ch;
  margin: 26px 0 0;
  color: rgba(244, 247, 248, 0.62);
  font-size: clamp(0.95rem, 1.5vw, 1.08rem);
  font-weight: 400;
  line-height: 1.75;
  animation: hero-rise 0.9s cubic-bezier(0.19, 1, 0.22, 1) 0.42s both;
}

/* 最新一篇 */
.hero-entry {
  display: block;
  max-width: 34ch;
  margin-top: clamp(30px, 7vh, 76px);
  padding-top: 18px;
  border-top: 1px solid rgba(244, 247, 248, 0.16);
  text-decoration: none;
  animation: hero-rise 0.9s cubic-bezier(0.19, 1, 0.22, 1) 0.62s both;
}

.hero-entry-label {
  display: block;
  margin-bottom: 8px;
  color: rgba(244, 247, 248, 0.46);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}

.hero-entry-title {
  position: relative;
  display: inline;
  color: rgba(244, 247, 248, 0.92);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.55;
  background-image: linear-gradient(var(--hero-accent), var(--hero-accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 0.45s cubic-bezier(0.19, 1, 0.22, 1), color 0.3s ease;
}

.hero-entry:hover .hero-entry-title,
.hero-entry:focus-visible .hero-entry-title {
  color: #ffffff;
  background-size: 100% 1px;
}

.hero-entry:focus-visible {
  outline: 2px solid var(--hero-accent);
  outline-offset: 6px;
}

.hero-entry-date {
  display: block;
  margin-top: 10px;
  color: rgba(244, 247, 248, 0.42);
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

/* ---------- 右栏结构图 ---------- */
/* 通电：一段光沿主干扫过 */
@keyframes hero-rise {
  from {
    opacity: 0;
    transform: translate3d(0, 22px, 0);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 滚动提示：一根下落的线 ---------- */
#page-header.full_page #scroll-down {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  left: auto;
  right: clamp(24px, 5vw, 80px);
  bottom: 0;
  width: auto;
  height: 120px;
  z-index: 12;
  cursor: pointer;
  opacity: 0;
  animation: hero-rise 0.9s cubic-bezier(0.19, 1, 0.22, 1) 0.9s forwards;
}

.hero-scroll-line {
  position: relative;
  width: 1px;
  height: 72px;
  overflow: hidden;
  background: rgba(244, 247, 248, 0.2);
}

.hero-scroll-line:after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 34%;
  background: linear-gradient(to bottom, transparent, var(--hero-accent));
  animation: hero-scroll-trace 2.4s cubic-bezier(0.6, 0, 0.4, 1) infinite;
}

@keyframes hero-scroll-trace {
  0% {
    transform: translateY(-110%);
  }
  100% {
    transform: translateY(300%);
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  /* 窄屏点云会压住文字，用径向遮罩把中间挖空，只留四周的线条 */
  .hero-scene {
    opacity: 0.6;
    -webkit-mask-image: radial-gradient(
      ellipse 78% 34% at 50% 52%,
      transparent 42%,
      #000 88%
    );
    mask-image: radial-gradient(
      ellipse 78% 34% at 50% 52%,
      transparent 42%,
      #000 88%
    );
  }

}

@media (max-height: 720px) {
  #page-header.full_page #site-title {
    font-size: clamp(2rem, min(6.4vw, 8vh), 4rem);
  }

  .hero-lede {
    margin-top: 18px;
    line-height: 1.6;
  }

  .hero-entry {
    margin-top: 28px;
    padding-top: 14px;
  }

}

@media (max-width: 768px) {
  #page-header.full_page #site-info {
    padding: 0 22px;
  }

  #page-header.full_page #site-title {
    font-size: clamp(2.2rem, 11vw, 3.2rem);
  }

  .hero-lede {
    margin-top: 20px;
  }

  .hero-entry {
    margin-top: 34px;
  }

  #page-header.full_page #scroll-down {
    right: 22px;
    height: 96px;
  }

  .hero-scroll-line {
    height: 52px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #page-header.full_page #site-title,
  .hero-lede,
  .hero-entry,
  #page-header.full_page #scroll-down {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  #page-header.full_page #site-info {
    transform: none !important;
    opacity: 1 !important;
  }

  .hero-scroll-line:after {
    animation: none !important;
  }
}