:root {
  --bg: #05070d;
  --bg-2: #0a0f1a;
  --bg-3: #0e1524;
  --panel: rgba(14, 21, 36, 0.72);
  --line: rgba(0, 212, 255, 0.14);
  --line-strong: rgba(0, 212, 255, 0.35);
  --cyan: #00d4ff;
  --green: #00ffa3;
  --blue: #4d8dff;
  --text: #e6f1ff;
  --muted: #8ea3c0;
  --muted-2: #5f7391;
  --glow-cyan: 0 0 24px rgba(0, 212, 255, 0.35);
  --glow-green: 0 0 24px rgba(0, 255, 163, 0.25);
  --radius: 14px;
  --nav-h: 72px;
  --font: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", "SF Mono", Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 212, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(0, 255, 163, 0.06), transparent),
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: auto, auto, 48px 48px, 48px 48px;
  pointer-events: none;
  z-index: 0;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  width: min(1160px, 92%);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* ===== Nav ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(5, 7, 13, 0.75);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.logo-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.logo span em {
  font-style: normal;
  color: var(--cyan);
}

.logo-sub {
  display: block;
  font-size: 10px;
  font-weight: 400;
  color: var(--muted-2);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 8px 16px;
  font-size: 14.5px;
  color: var(--muted);
  border-radius: 8px;
  transition: all 0.25s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: rgba(0, 212, 255, 0.08);
}

.nav-links a.active { color: var(--cyan); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

.lang-switch a {
  padding: 4px 8px;
  border-radius: 6px;
  transition: 0.2s;
}

.lang-switch a.active,
.lang-switch a:hover {
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.1);
}

.lang-switch i { font-style: normal; color: var(--muted-2); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 14.5px;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.25s;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #031018;
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(0, 212, 255, 0.5);
}

.btn-ghost {
  background: rgba(0, 212, 255, 0.06);
  border-color: var(--line-strong);
  color: var(--cyan);
}

.btn-ghost:hover {
  background: rgba(0, 212, 255, 0.14);
  box-shadow: var(--glow-cyan);
}

.btn-sm { padding: 9px 18px; font-size: 13.5px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
  transition: 0.3s;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + 72px) 0 90px;
  min-height: 88vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 12.5px;
  color: var(--green);
  background: rgba(0, 255, 163, 0.07);
  border: 1px solid rgba(0, 255, 163, 0.3);
  border-radius: 999px;
  font-family: var(--mono);
  letter-spacing: 0.5px;
  margin-bottom: 24px;
}

.badge::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: pulse 1.6s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero h1 {
  font-size: clamp(34px, 4.6vw, 56px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 22px;
}

.hero h1 .grad {
  background: linear-gradient(90deg, var(--cyan), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lead {
  font-size: 17px;
  color: var(--muted);
  max-width: 540px;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 52px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.stat b {
  display: block;
  font-size: 30px;
  font-weight: 800;
  font-family: var(--mono);
  background: linear-gradient(90deg, var(--cyan), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat span { font-size: 13px; color: var(--muted-2); }

/* terminal card */
.terminal {
  background: linear-gradient(160deg, rgba(14, 21, 36, 0.95), rgba(8, 12, 22, 0.95));
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), var(--glow-cyan);
  font-family: var(--mono);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.35);
  border-bottom: 1px solid var(--line);
}

.terminal-bar i {
  width: 11px; height: 11px;
  border-radius: 50%;
  display: block;
}

.terminal-bar i:nth-child(1) { background: #ff5f57; }
.terminal-bar i:nth-child(2) { background: #febc2e; }
.terminal-bar i:nth-child(3) { background: #28c840; }

.terminal-bar span {
  margin-left: 8px;
  font-size: 12px;
  color: var(--muted-2);
}

.terminal-body {
  padding: 22px;
  font-size: 13.5px;
  line-height: 1.9;
  min-height: 300px;
}

.terminal-body .prompt { color: var(--green); }
.terminal-body .cmd { color: var(--text); }
.terminal-body .out { color: var(--muted); }
.terminal-body .ok { color: var(--green); }
.terminal-body .info { color: var(--cyan); }
.terminal-body .warn { color: #ffc857; }
.terminal-body .cursor {
  display: inline-block;
  width: 8px; height: 15px;
  background: var(--cyan);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink { 50% { opacity: 0; } }

/* ===== Sections ===== */
.section { padding: 96px 0; position: relative; }
.section.alt { background: rgba(10, 15, 26, 0.55); border-block: 1px solid var(--line); }

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--cyan);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}

.section-head p { color: var(--muted); font-size: 16px; }

/* cards grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--line-strong);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45), var(--glow-cyan);
}

.card:hover::before { opacity: 1; }

.card-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(0, 255, 163, 0.08));
  border: 1px solid var(--line-strong);
  margin-bottom: 20px;
}

.card-icon svg { width: 26px; height: 26px; stroke: var(--cyan); }

.card h3 {
  font-size: 18.5px;
  margin-bottom: 12px;
  font-weight: 700;
}

.card p { color: var(--muted); font-size: 14.5px; }

.card .tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tag {
  font-size: 12px;
  font-family: var(--mono);
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid var(--line);
  color: var(--cyan);
}

/* product hero block */
.product-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 72px;
}

.product-feature:last-child { margin-bottom: 0; }

.feature-list { margin-top: 24px; display: grid; gap: 14px; }

.feature-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  color: var(--muted);
  font-size: 15px;
}

.feature-list li::before {
  content: "▹";
  color: var(--green);
  font-size: 18px;
  line-height: 1.5;
  flex-shrink: 0;
}

.feature-list li b { color: var(--text); font-weight: 600; }

/* solution rows */
.solution-item {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 18px;
  transition: all 0.3s;
}

.solution-item:hover {
  border-color: var(--line-strong);
  transform: translateX(6px);
  box-shadow: var(--glow-cyan);
}

.solution-num {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 800;
  color: rgba(0, 212, 255, 0.35);
}

.solution-item h3 { font-size: 18px; margin-bottom: 6px; }
.solution-item p { color: var(--muted); font-size: 14.5px; }

.solution-item .arrow {
  color: var(--cyan);
  font-size: 22px;
  opacity: 0;
  transition: 0.3s;
}

.solution-item:hover .arrow { opacity: 1; transform: translateX(4px); }

/* page hero (inner pages) */
.page-hero {
  padding: calc(var(--nav-h) + 64px) 0 56px;
  text-align: center;
  border-bottom: 1px solid var(--line);
  background: radial-gradient(ellipse 70% 80% at 50% 0%, rgba(0, 212, 255, 0.1), transparent);
}

.page-hero h1 {
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 14px;
}

.page-hero p {
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto;
  font-size: 16px;
}

.breadcrumb {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted-2);
  margin-bottom: 18px;
}

.breadcrumb a { color: var(--cyan); }
.breadcrumb span { margin: 0 8px; }

/* ===== CTA ===== */
.cta-band {
  padding: 72px 0;
  background:
    radial-gradient(ellipse 60% 100% at 50% 100%, rgba(0, 212, 255, 0.12), transparent),
    var(--bg-2);
  border-top: 1px solid var(--line);
  text-align: center;
}

.cta-band h2 {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  margin-bottom: 14px;
}

.cta-band p { color: var(--muted); margin-bottom: 30px; }

.cta-band .hero-actions { justify-content: center; }

/* ===== Footer ===== */
.footer {
  background: #04060b;
  border-top: 1px solid var(--line);
  padding: 64px 0 0;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer h4 {
  font-size: 14px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 18px;
  font-family: var(--mono);
}

.footer-brand p {
  color: var(--muted);
  font-size: 14px;
  margin-top: 14px;
  max-width: 300px;
}

.footer ul li { margin-bottom: 10px; }
.footer ul a { color: var(--muted); font-size: 14.5px; transition: 0.2s; }
.footer ul a:hover { color: var(--cyan); }

.footer-contact li {
  color: var(--muted);
  font-size: 14.5px;
  margin-bottom: 12px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.footer-contact svg {
  width: 16px; height: 16px;
  stroke: var(--cyan);
  flex-shrink: 0;
  margin-top: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--muted-2);
}

.footer-bottom a { color: var(--muted-2); }
.footer-bottom a:hover { color: var(--cyan); }

/* ===== Reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-grid, .product-feature { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { min-height: auto; padding-bottom: 60px; }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: rgba(5, 7, 13, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-130%);
    transition: transform 0.3s;
    gap: 4px;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 14px 16px; }
  .nav-toggle { display: flex; }
  .nav-right .btn { display: none; }
  .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .solution-item { grid-template-columns: 1fr; gap: 10px; }
  .solution-item .arrow { display: none; }
  .section { padding: 64px 0; }
}