:root {
  --ink: #071018;
  --ink-2: #0e1a26;
  --mist: #d7e2ea;
  --mute: #8fa3b3;
  --line: rgba(215, 226, 234, 0.14);
  --teal: #3ecfc0;
  --teal-deep: #1aa896;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--mist);
  background: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.top {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px clamp(20px, 5vw, 56px);
  transition: background .35s ease, backdrop-filter .35s ease, border-color .35s ease;
  border-bottom: 1px solid transparent;
}
.top.is-solid {
  background: rgba(7, 16, 24, 0.78);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.brand {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.12em;
}
.login {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--mist);
  border: 1px solid var(--line);
  padding: 10px 18px;
  transition: border-color .25s ease, color .25s ease, background .25s ease;
}
.login:hover {
  border-color: rgba(62, 207, 192, 0.55);
  color: #fff;
  background: rgba(62, 207, 192, 0.08);
}

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: end;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.06);
  animation: heroDrift 18s ease-in-out infinite alternate;
}
.hero-veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(180deg, rgba(7,16,24,0.35) 0%, rgba(7,16,24,0.55) 42%, rgba(7,16,24,0.92) 100%),
    linear-gradient(90deg, rgba(7,16,24,0.55) 0%, rgba(7,16,24,0.15) 55%, rgba(7,16,24,0.45) 100%);
}
.hero-copy {
  position: relative;
  z-index: 2;
  padding: 0 clamp(20px, 5vw, 56px) clamp(72px, 12vh, 120px);
  max-width: 920px;
  opacity: 0;
  transform: translateY(28px);
  animation: riseIn .9s ease forwards .15s;
}
.brand-mark {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: clamp(42px, 8vw, 88px);
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1;
  color: #fff;
}
.hero-copy h1 {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: clamp(28px, 4.6vw, 48px);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #f3f7fa;
}
.lead {
  margin: 0 0 32px;
  max-width: 34em;
  font-size: clamp(15px, 1.7vw, 18px);
  color: var(--mute);
}
.cta { display: flex; gap: 14px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 28px;
  background: linear-gradient(135deg, var(--teal) 0%, var(--teal-deep) 100%);
  color: #041016;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
  box-shadow: 0 12px 30px rgba(26, 168, 150, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
  box-shadow: 0 16px 36px rgba(26, 168, 150, 0.32);
}

.block {
  padding: clamp(72px, 12vh, 120px) clamp(20px, 5vw, 56px);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(900px 420px at 10% 0%, rgba(62, 207, 192, 0.07), transparent 60%),
    var(--ink);
}
.block h2 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #fff;
}
.sub {
  margin: 0 0 48px;
  max-width: 34em;
  color: var(--mute);
  font-size: 16px;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 28px;
  counter-reset: none;
}
.steps li {
  display: grid;
  grid-template-columns: 72px 1fr;
  grid-template-rows: auto auto;
  column-gap: 18px;
  row-gap: 6px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
}
.steps li.is-in { opacity: 1; transform: none; }
.steps .n {
  grid-row: 1 / span 2;
  align-self: start;
  font-family: var(--serif);
  font-size: 28px;
  color: var(--teal);
  letter-spacing: 0.04em;
}
.steps strong {
  font-size: 20px;
  font-weight: 600;
  color: #fff;
}
.steps span:last-child { color: var(--mute); }

.caps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.caps li {
  display: grid;
  grid-template-columns: minmax(140px, 220px) 1fr;
  gap: 18px;
  align-items: baseline;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
}
.caps li:last-child { border-bottom: 1px solid var(--line); }
.caps li.is-in { opacity: 1; transform: none; }
.caps strong {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.04em;
}
.caps span { color: var(--mute); }

.capability {
  background:
    radial-gradient(800px 360px at 90% 20%, rgba(62, 207, 192, 0.08), transparent 55%),
    linear-gradient(180deg, #08131c 0%, var(--ink) 100%);
}

.close {
  text-align: left;
  background:
    linear-gradient(135deg, rgba(62, 207, 192, 0.12), transparent 45%),
    var(--ink-2);
}
.close .btn-primary { margin-top: 8px; }

.foot {
  border-top: 1px solid var(--line);
  padding: 28px clamp(20px, 5vw, 56px) 36px;
  background: #050b11;
}
.foot-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  justify-content: space-between;
  align-items: center;
  color: var(--mute);
  font-size: 13px;
}
.foot a:hover { color: var(--teal); }

@keyframes heroDrift {
  from { transform: scale(1.06) translate3d(0, 0, 0); }
  to { transform: scale(1.12) translate3d(-1.5%, -1%, 0); }
}
@keyframes riseIn {
  to { opacity: 1; transform: none; }
}

@media (max-width: 720px) {
  .caps li {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .steps li {
    grid-template-columns: 56px 1fr;
  }
  .brand-mark { letter-spacing: 0.12em; }
}