/* 蓝黑立体 · 机房云服务器 */
:root {
  --bg: #070b14;
  --rack: #0d1424;
  --blade: #121c31;
  --ink: #e6eefc;
  --mute: #8fa3c4;
  --line: rgba(90, 140, 220, 0.22);
  --blue: #3d8bff;
  --blue-deep: #1f5fd0;
  --cyan: #4fd0ff;
  --ok: #4fd4a5;
  --shadow: 0 22px 48px rgba(0, 0, 0, 0.45);
  --radius: 10px;
  --font-display: "Bahnschrift", "Segoe UI Variable Display", "Microsoft YaHei UI", sans-serif;
  --font-body: "Segoe UI", "Microsoft YaHei UI", sans-serif;
  --font-mono: "Cascadia Mono", "Consolas", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(900px 520px at 85% -5%, rgba(61, 139, 255, 0.18), transparent 55%),
    radial-gradient(700px 480px at 10% 30%, rgba(79, 208, 255, 0.08), transparent 50%),
    linear-gradient(180deg, #05080f, var(--bg) 40%, #060a12);
  line-height: 1.65;
}
img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.2; margin: 0 0 0.55rem; letter-spacing: 0.02em; }
p { margin: 0 0 0.85rem; }
.wrap { width: min(1120px, calc(100% - 2rem)); margin-inline: auto; }

.dc > * { position: relative; z-index: 1; }

/* isometric grid floor */
.floor {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(61, 139, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 139, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: perspective(600px) rotateX(60deg) scale(1.4);
  transform-origin: center 80%;
  opacity: 0.45;
  mask-image: linear-gradient(180deg, transparent, #000 30%, transparent 85%);
}

/* top rack bar */
.rack-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0 0.4rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}
.led {
  width: 42px; height: 42px;
  border-radius: 8px;
  background: linear-gradient(160deg, #1a2d55, #0b1328);
  border: 1px solid var(--line);
  display: grid; place-items: center;
  box-shadow: inset 0 0 12px rgba(61, 139, 255, 0.25);
  position: relative;
}
.led::after {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: blink 1.6s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}
.logo b { display: block; font-size: 1.08rem; }
.logo small {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--mute);
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.95rem;
  font-size: 0.92rem;
}
.nav a { color: var(--mute); }
.nav a:hover, .nav a.on { color: var(--ink); }
.nav a.on {
  text-shadow: 0 0 12px rgba(79, 208, 255, 0.35);
  box-shadow: inset 0 -2px 0 var(--blue);
}
.power {
  padding: 0.48rem 0.95rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(18, 28, 49, 0.9);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* HERO — 3D rack console */
.rack-hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.3rem;
  align-items: center;
  min-height: min(74vh, 700px);
  padding: 1.5rem 0 2.3rem;
  perspective: 1200px;
}
.console {
  background: linear-gradient(160deg, #15233f, var(--blade));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(79, 208, 255, 0.12);
  padding: 1.4rem 1.3rem 1.45rem;
  transform: rotateY(-4deg);
  position: relative;
}
.console::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--cyan), var(--blue-deep));
  border-radius: var(--radius) 0 0 var(--radius);
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--ok);
  margin-bottom: 0.85rem;
  text-transform: uppercase;
}
.status i {
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--ok);
  box-shadow: 0 0 10px rgba(79, 212, 165, 0.55);
  display: inline-block;
}
.rack-hero h1 {
  font-size: clamp(1.95rem, 3.9vw, 3rem);
  max-width: 10ch;
}
.lead { color: var(--mute); font-size: 1.03rem; max-width: 40ch; }
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.15rem 0 0.95rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  padding: 0.78rem 1.15rem;
  border-radius: 6px;
  font-weight: 700;
  white-space: nowrap;
  word-break: keep-all;
  writing-mode: horizontal-tb;
  border: 1px solid transparent;
  transition: transform 0.18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-blue {
  background: linear-gradient(120deg, var(--blue), var(--blue-deep));
  color: #fff;
  box-shadow: 0 12px 28px rgba(31, 95, 208, 0.35);
}
.btn-ghost {
  background: rgba(7, 11, 20, 0.55);
  border-color: var(--line);
  color: var(--ink);
}
.req {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
}
.req p {
  margin: 0;
  padding: 0.65rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.28);
  font-size: 0.86rem;
  color: var(--mute);
}
.req b {
  display: block;
  color: var(--ink);
  font-size: 0.76rem;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.viewport {
  align-self: center;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #080d18;
  overflow: hidden;
  box-shadow: var(--shadow), 0 0 0 1px rgba(61, 139, 255, 0.08);
  transform: rotateY(4deg);
}

/* sections */
.sec { padding: 2.9rem 0; }
.head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem 1rem;
  align-items: end;
  margin-bottom: 1.35rem;
}
.head .slot {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  border-left: 1px solid var(--line);
  padding-left: 0.45rem;
}
.head h2 { font-size: clamp(1.45rem, 2.5vw, 2rem); }
.head p { margin: 0; color: var(--mute); max-width: 50ch; }

/* download as blade servers — stacked 3D */
.blades {
  display: grid;
  gap: 0.7rem;
  perspective: 1000px;
}
.blade {
  display: grid;
  grid-template-columns: 88px 1.1fr 1.2fr 1fr auto;
  gap: 0.8rem;
  align-items: center;
  background: linear-gradient(90deg, #15233f, var(--blade));
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.95rem 1rem;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(79, 208, 255, 0.08);
  transform: rotateX(3deg);
}
.blade .u {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: #061018;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
  text-align: center;
  padding: 0.55rem 0.3rem;
  border-radius: 6px;
  line-height: 1.2;
}
.blade:nth-child(2) .u { background: linear-gradient(180deg, #6ab8ff, #2f74e8); }
.blade:nth-child(3) .u { background: linear-gradient(180deg, #5ad0ef, #2a8fc4); }
.blade:nth-child(4) .u { background: linear-gradient(180deg, #7aa0ff, #3a5fd0); }
.blade .os { font-size: 1.1rem; margin: 0; font-weight: 700; }
.blade .meta { margin: 0; color: var(--mute); font-size: 0.9rem; }
.blade .meta b { color: var(--ink); }
.blade .btn { min-width: 120px; }

/* capability chassis */
.chassis {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--rack);
  box-shadow: var(--shadow);
}
.bay {
  padding: 1.2rem 0.95rem 1.3rem;
  border-right: 1px solid var(--line);
}
.bay:last-child { border-right: 0; }
.bay .ico {
  width: 40px; height: 40px;
  border-radius: 8px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  background: rgba(61, 139, 255, 0.1);
  color: var(--cyan);
  font-weight: 800;
  margin-bottom: 0.7rem;
}
.bay h3 { font-size: 1rem; }
.bay p { margin: 0; color: var(--mute); font-size: 0.86rem; }

/* architecture */
.arch {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 1.1rem;
}
.spec {
  background: linear-gradient(160deg, #15233f, var(--blade));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.3rem;
  box-shadow: var(--shadow);
}
.spec h2 { font-size: 1.55rem; }
.spec p { color: var(--mute); }
.bullets {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}
.bullets li {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 0.55rem;
  align-items: start;
  font-size: 0.95rem;
}
.bullets li::before {
  content: "";
  width: 8px; height: 8px;
  margin-top: 0.45rem;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(79, 208, 255, 0.18);
}
.gallery {
  display: grid;
  grid-template-rows: 1.15fr auto;
  gap: 0.7rem;
}
.shot {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: #080d18;
  box-shadow: var(--shadow);
}
.shot-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}

/* trust */
.trust {
  text-align: center;
  padding: 2.1rem 1.2rem;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 0%, rgba(61, 139, 255, 0.16), transparent 50%),
    var(--rack);
  box-shadow: var(--shadow);
}
.trust .big {
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  margin-bottom: 0.3rem;
}
.trust .big em {
  font-style: normal;
  color: var(--cyan);
  text-shadow: 0 0 16px rgba(79, 208, 255, 0.35);
}
.trust .sub { color: var(--mute); margin-bottom: 1.15rem; }
.brands {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}
.brands span {
  padding: 0.42rem 0.9rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.28);
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

/* ops + help */
.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0.85rem;
}
.panel {
  background: var(--rack);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-h {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.95rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.22);
}
.panel-h h2 { font-size: 1.18rem; margin: 0; }
.panel-h a { color: var(--cyan); font-size: 0.88rem; font-weight: 700; }
.log {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 0.75rem;
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid rgba(90, 140, 220, 0.14);
}
.log:last-child { border-bottom: 0; }
.log time {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan);
}
.log h3 { font-size: 0.98rem; margin-bottom: 0.2rem; }
.log p { margin: 0; color: var(--mute); font-size: 0.88rem; }
.faq details {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid rgba(90, 140, 220, 0.14);
}
.faq details:last-child { border-bottom: 0; }
.faq summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "> ";
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.faq p { color: var(--mute); margin: 0.5rem 0 0.1rem; font-size: 0.92rem; }

/* power on CTA */
.poweron {
  margin: 0.5rem 0 2.7rem;
  padding: 1.6rem 1.35rem;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(61, 139, 255, 0.14), transparent 45%),
    var(--blade);
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 1rem;
  align-items: center;
}
.poweron h2 { font-size: clamp(1.35rem, 2.3vw, 1.8rem); }
.gains {
  list-style: none;
  margin: 0.85rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}
.gains li {
  color: var(--mute);
  padding-left: 1rem;
  position: relative;
  font-size: 0.95rem;
}
.gains li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.55rem;
  width: 7px; height: 7px;
  background: var(--ok);
  box-shadow: 0 0 8px rgba(79, 212, 165, 0.45);
}

.foot {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--mute);
  font-size: 0.88rem;
}
.foot nav { display: flex; gap: 1rem; }

.page-hero {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 1.15rem;
  align-items: center;
  padding: 1.5rem 0 1rem;
  perspective: 1200px;
}
.page-hero h1 { font-size: clamp(1.7rem, 3.3vw, 2.45rem); max-width: 12ch; }

@media (max-width: 980px) {
  .rack-hero, .arch, .split, .poweron, .page-hero { grid-template-columns: 1fr; }
  .console, .viewport { transform: none; }
  .blade { grid-template-columns: 1fr; transform: none; }
  .chassis { grid-template-columns: 1fr 1fr; }
  .bay { border-bottom: 1px solid var(--line); }
  .bay:nth-child(even) { border-right: 0; }
  .power { display: none; }
  .blades { perspective: none; }
}
@media (max-width: 640px) {
  .chassis, .req, .shot-row { grid-template-columns: 1fr; }
  .bay { border-right: 0 !important; }
  .head { grid-template-columns: 1fr; }
  .head .slot { writing-mode: horizontal-tb; transform: none; border-left: 0; border-bottom: 1px solid var(--line); padding: 0 0 0.3rem; width: max-content; }
  .actions .btn { flex: 1 1 100%; }
  .blade .btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .led::after { animation: none; }
  .btn:hover { transform: none; }
}

/* ===== Hero image hard rules ===== */
.rack-hero,
.page-hero { align-items: center; }
.viewport {
  align-self: center;
  height: auto;
  padding: 0;
  margin: 0;
}
.viewport img,
.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  margin: 0;
  padding: 0;
  min-height: 0;
  max-height: none;
  clip-path: none;
  transform: none;
}