/* ==========================================================================
   幻异阁网络科技 · 布局层
   页头 / 导航 / 页脚 / Hero / 页面横幅 / 栅格 / 回到顶部
   ========================================================================== */

/* ---------- 1. 页头 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(5, 7, 13, .62);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: height .35s var(--ease), background .35s var(--ease), border-color .35s var(--ease);
}

.site-header.is-scrolled {
  height: 64px;
  background: rgba(5, 7, 13, .88);
  border-bottom-color: var(--line);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .45);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* 品牌标识 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand__mark {
  width: 40px;
  height: 40px;
  transition: transform .5s var(--ease);
}
.brand:hover .brand__mark { transform: rotate(-8deg) scale(1.06); }

.brand__text { display: flex; flex-direction: column; line-height: 1.2; }

.brand__text strong {
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: #fff;
  white-space: nowrap;
}

.brand__text em {
  font-style: normal;
  font-size: .58rem;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---------- 2. 导航 ---------- */
.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__list a {
  position: relative;
  display: block;
  padding: 9px 14px;
  border-radius: var(--r-sm);
  font-size: .94rem;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
}

.nav__list a::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}

.nav__list a:hover { color: #fff; }
.nav__list a:hover::after { transform: scaleX(1); }

.nav__list a.is-active {
  color: #fff;
  background: rgba(255, 255, 255, .06);
}
.nav__list a.is-active::after { transform: scaleX(1); }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line-2);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: background .3s var(--ease);
}
.nav__toggle:hover { background: rgba(255, 255, 255, .07); }

.nav__toggle span {
  display: block;
  width: 20px; height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform .35s var(--ease), opacity .25s var(--ease);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 3. Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 72px) 0 96px;
  overflow: hidden;
  isolation: isolate;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(1200px 640px at 78% 8%, rgba(47, 107, 255, .22), transparent 62%),
    radial-gradient(900px 560px at 8% 88%, rgba(0, 229, 192, .16), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, #060a12 55%, var(--ink) 100%);
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 78% 66% at 52% 34%, #000 0%, transparent 76%);
  mask-image: radial-gradient(ellipse 78% 66% at 52% 34%, #000 0%, transparent 76%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: 64px;
  align-items: center;
  width: 100%;
}

.hero__copy { max-width: 640px; }

.hero__title {
  margin-bottom: 26px;
  font-size: clamp(2.5rem, 5.4vw, 4.2rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.03em;
  color: #fff;
}

.hero__desc {
  max-width: 560px;
  font-size: clamp(1rem, 1.4vw, 1.14rem);
  line-height: 1.9;
  color: var(--text-2);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

/* 数字指标条 */
.hero__kpis {
  display: flex;
  flex-wrap: wrap;
  gap: 44px;
  margin-top: 58px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.kpi__value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 2.6vw, 2.3rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: -.03em;
}

.kpi__value i {
  font-style: normal;
  font-size: .5em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.kpi__label {
  margin-top: 4px;
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--muted);
}

.hero__visual { position: relative; }

/* ---------- 4. 页面横幅（内页） ---------- */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 88px) 0 80px;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(1000px 480px at 76% 0%, rgba(47, 107, 255, .20), transparent 62%),
    radial-gradient(760px 420px at 6% 100%, rgba(0, 229, 192, .12), transparent 60%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(ellipse 72% 80% at 50% 20%, #000 0%, transparent 78%);
  mask-image: radial-gradient(ellipse 72% 80% at 50% 20%, #000 0%, transparent 78%);
}

.page-hero__title {
  margin: 20px 0 20px;
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.025em;
  color: #fff;
}

.page-hero__desc {
  max-width: 720px;
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  line-height: 1.9;
  color: var(--text-2);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  color: var(--muted);
}
.breadcrumb a:hover { color: var(--brand-2); }
.breadcrumb span { opacity: .5; }

/* ---------- 5. 栅格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--auto-280 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--auto-320 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.gap-16 { gap: 16px; }
.gap-32 { gap: 32px; }
.gap-48 { gap: 48px; }

/* 左右分栏 */
.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 64px;
  align-items: center;
}

.split--aside { grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); }
.split--reverse .split__media { order: -1; }

.split__body { max-width: 560px; }
.split--reverse .split__body { margin-left: auto; }

/* ---------- 6. 区块标题 ---------- */
.section-head {
  max-width: 780px;
  margin: 0 auto 68px;
  text-align: center;
}

.section-head--left {
  margin-left: 0;
  text-align: left;
}

.section-head .h2 { margin-bottom: 18px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  padding: 7px 16px 7px 12px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-pill);
  background: rgba(255, 255, 255, .04);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-2);
}

.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--brand-2);
  box-shadow: 0 0 0 4px rgba(0, 229, 192, .18);
  animation: pulseDot 2.4s var(--ease) infinite;
}

/* ---------- 7. CTA 区块 ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  padding: 96px 0;
  background:
    radial-gradient(900px 460px at 20% 12%, rgba(47, 107, 255, .26), transparent 60%),
    radial-gradient(760px 400px at 84% 88%, rgba(0, 229, 192, .18), transparent 60%),
    linear-gradient(140deg, #070c16, #0b1220);
  border-top: 1px solid var(--line);
}

.cta-band__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
}

.cta-band__title {
  max-width: 620px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -.02em;
  color: #fff;
}

.cta-band__desc {
  max-width: 560px;
  margin-top: 14px;
  color: var(--text-2);
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  padding: 84px 0 0;
  background: linear-gradient(180deg, var(--ink-2), #04060b);
  border-top: 1px solid var(--line);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 60px;
}

.footer__brand { max-width: 340px; }

.footer__brand .brand { margin-bottom: 20px; }

.footer__desc {
  font-size: .92rem;
  line-height: 1.85;
  color: var(--muted);
}

.footer__contact {
  margin-top: 24px;
  display: grid;
  gap: 10px;
  font-size: .9rem;
  color: var(--text-2);
}

.footer__contact li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer__contact svg { flex-shrink: 0; opacity: .7; }

.footer__col h4 {
  margin-bottom: 20px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: #fff;
}

.footer__links { display: grid; gap: 12px; }

.footer__links a {
  font-size: .92rem;
  color: var(--muted);
}
.footer__links a:hover { color: var(--brand-2); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  font-size: .82rem;
  color: var(--muted);
}

.footer__legal { display: flex; flex-wrap: wrap; gap: 20px; }
.footer__legal a:hover { color: var(--brand-2); }

/* ---------- 9. 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  z-index: 800;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: rgba(12, 18, 32, .9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--text);
  box-shadow: var(--sh-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover {
  border-color: transparent;
  background: var(--grad);
  color: #04121a;
}

/* ---------- 10. 跑马灯 ---------- */
.marquee {
  position: relative;
  overflow: hidden;
  padding: 22px 0;
  border-block: 1px solid var(--line);
  background: rgba(255, 255, 255, .02);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

.marquee__track {
  display: flex;
  align-items: center;
  gap: 64px;
  width: max-content;
  animation: marquee 34s linear infinite;
}

.marquee:hover .marquee__track { animation-play-state: paused; }

.marquee__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: .96rem;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--muted);
  white-space: nowrap;
}

.marquee__item svg { color: var(--brand-2); opacity: .8; }