@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --color-accent: #38BDF8;
  --color-accent-hover: #0EA5E9;
  --color-accent-dim: rgba(56, 189, 248, 0.14);
  --color-background: #0F172A;
  --color-surface: #111827;
  --color-elevated: #1E293B;
  --color-foreground: #F8FAFC;
  --color-muted-fg: #94A3B8;
  --color-border: #334155;
  --color-success: #7DD3FC;
  --color-warning: #FBBF24;
  --font-sans: "IBM Plex Sans", "PingFang SC", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 220ms;
  --nav-h: 64px;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-background);
  color: var(--color-foreground);
  color-scheme: dark;
  line-height: 1.55;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(980px 560px at 8% -8%, rgba(56, 189, 248, 0.14), transparent 58%),
    radial-gradient(720px 480px at 96% 12%, rgba(14, 165, 233, 0.07), transparent 55%),
    linear-gradient(180deg, #0B1224 0%, var(--color-background) 42%, #0B1220 100%);
  animation: atmosphere 18s var(--ease) infinite alternate;
}

@keyframes atmosphere {
  from { filter: saturate(1) brightness(1); }
  to { filter: saturate(1.06) brightness(1.03); }
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  backdrop-filter: blur(14px);
  background: rgba(15, 23, 42, 0.72);
  border-bottom: 1px solid rgba(51, 65, 85, 0.65);
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 18px;
  color: var(--color-foreground);
  letter-spacing: -0.02em;
}

.nav-brand svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
}

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

.nav-links a {
  color: var(--color-muted-fg);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.nav-links a:hover {
  color: var(--color-foreground);
  background: rgba(30, 41, 59, 0.55);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface);
}

.lang-btn {
  border: 0;
  border-radius: 0;
  padding: 6px 10px;
  min-height: 32px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-sans);
  background: transparent;
  color: var(--color-muted-fg);
  cursor: pointer;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease);
}

.lang-btn + .lang-btn { border-left: 1px solid var(--color-border); }
.lang-btn.active {
  background: var(--color-elevated);
  color: var(--color-foreground);
}
.lang-btn:hover:not(.active) { color: var(--color-foreground); }
.lang-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
  z-index: 1;
}

.btn-nav {
  min-height: 36px;
  padding: 8px 14px;
  font-size: 13px;
  background: var(--color-accent);
  color: #0F172A;
  border-radius: var(--radius-sm);
  font-weight: 700;
}
.btn-nav:hover {
  background: var(--color-accent-hover);
  color: #0F172A;
}

.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: 56px 24px 72px;
  position: relative;
  overflow: hidden;
}

.hero-plane {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(closest-side at 78% 55%, rgba(56, 189, 248, 0.16), transparent 72%),
    repeating-linear-gradient(
      -18deg,
      transparent 0 22px,
      rgba(56, 189, 248, 0.035) 22px 23px
    );
  mask-image: linear-gradient(90deg, transparent 0%, #000 38%, #000 100%);
  animation: gridDrift 24s linear infinite;
}

@keyframes gridDrift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-28px, 18px, 0); }
}

.hero-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px;
  align-items: center;
}

.hero-brand {
  font-family: var(--font-mono);
  font-size: clamp(42px, 7vw, 72px);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 0.95;
  margin: 0 0 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 700ms var(--ease) 60ms forwards;
}

.hero-brand svg {
  width: clamp(36px, 5.5vw, 56px);
  height: clamp(36px, 5.5vw, 56px);
  color: var(--color-accent);
  flex: none;
}

.hero h1 {
  margin: 0 0 14px;
  max-width: 16ch;
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.22;
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 700ms var(--ease) 160ms forwards;
}

.hero-lead {
  margin: 0 0 28px;
  max-width: 42ch;
  color: var(--color-muted-fg);
  font-size: clamp(15px, 1.8vw, 17px);
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 700ms var(--ease) 260ms forwards;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  opacity: 0;
  transform: translateY(18px);
  animation: riseIn 700ms var(--ease) 360ms forwards;
}

.hero-meta {
  margin: 14px 0 0;
  color: var(--color-muted-fg);
  font-size: 13px;
  font-family: var(--font-mono);
  opacity: 0;
  animation: riseIn 700ms var(--ease) 440ms forwards;
}

@keyframes riseIn {
  to { opacity: 1; transform: translateY(0); }
}

.hero-stage {
  position: relative;
  min-height: 340px;
  opacity: 0;
  transform: translateY(24px);
  animation: riseIn 900ms var(--ease) 280ms forwards;
}

.stage-host,
.stage-guest {
  background: rgba(17, 24, 39, 0.92);
  border: 1px solid rgba(51, 65, 85, 0.9);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.stage-host {
  width: min(100%, 320px);
  position: relative;
  z-index: 2;
}

.stage-guest {
  width: min(100%, 360px);
  position: absolute;
  right: 0;
  top: 72px;
  z-index: 1;
}

.stage-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(51, 65, 85, 0.8);
  background: rgba(15, 23, 42, 0.9);
}

.stage-bar span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #475569;
}
.stage-bar span:nth-child(1) { background: #F87171; }
.stage-bar span:nth-child(2) { background: #FBBF24; }
.stage-bar span:nth-child(3) { background: #34D399; }

.stage-bar em {
  margin-left: 8px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-muted-fg);
}

.stage-body {
  padding: 18px 16px 20px;
  display: grid;
  gap: 12px;
}

.stage-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.stage-row label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-foreground);
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-background);
  flex: 1;
}

.stage-row button {
  border: 0;
  border-radius: 8px;
  padding: 8px 12px;
  background: var(--color-accent);
  color: #0F172A;
  font-weight: 700;
  font-size: 12px;
  font-family: var(--font-sans);
  cursor: default;
}

.stage-link {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--color-accent-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.stage-pulse {
  height: 4px;
  width: 42%;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  animation: pulseMove 2.4s var(--ease) infinite;
}

@keyframes pulseMove {
  0% { transform: translateX(0); opacity: 0.35; }
  50% { transform: translateX(80%); opacity: 1; }
  100% { transform: translateX(140%); opacity: 0.2; }
}

.stage-preview {
  padding: 18px 16px 22px;
  min-height: 168px;
  position: relative;
  background:
    linear-gradient(180deg, rgba(30, 41, 59, 0.35), transparent 70%),
    var(--color-surface);
}

.stage-ui-line {
  height: 10px;
  width: 58%;
  border-radius: 6px;
  background: rgba(148, 163, 184, 0.28);
  margin-bottom: 10px;
}
.stage-ui-line.wide { width: 78%; height: 14px; background: rgba(248, 250, 252, 0.22); }

.stage-ui-block {
  margin-top: 18px;
  height: 72px;
  border-radius: 10px;
  border: 1px solid rgba(51, 65, 85, 0.85);
  background: rgba(15, 23, 42, 0.55);
}

.stage-anno {
  position: absolute;
  left: 42%;
  top: 54px;
  width: 88px;
  height: 64px;
  border: 1.5px solid var(--color-accent);
  border-radius: 6px;
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.15);
  animation: annoPulse 2.8s var(--ease) infinite;
}

@keyframes annoPulse {
  0%, 100% { opacity: 0.55; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.03); }
}

.stage-beam {
  position: absolute;
  left: 38%;
  top: 120px;
  width: 28%;
  height: 2px;
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.05), var(--color-accent), rgba(56, 189, 248, 0.05));
  transform: rotate(12deg);
  z-index: 0;
  animation: beamGlow 2.2s ease-in-out infinite alternate;
}

@keyframes beamGlow {
  from { opacity: 0.35; }
  to { opacity: 0.9; }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  border: 0;
  transition:
    background var(--duration) var(--ease),
    color var(--duration) var(--ease),
    border-color var(--duration) var(--ease),
    transform var(--duration) var(--ease);
}

.btn:active { transform: scale(0.98); }
.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: #0F172A;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #0F172A;
}

.btn-ghost {
  background: transparent;
  color: var(--color-foreground);
  border: 1px solid var(--color-border);
}
.btn-ghost:hover {
  border-color: rgba(56, 189, 248, 0.45);
  background: rgba(30, 41, 59, 0.45);
  color: var(--color-foreground);
}

.section {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 72px 24px;
}

.section-head {
  margin-bottom: 36px;
  max-width: 52ch;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 10px;
}

.section h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.section-lead {
  margin: 0;
  color: var(--color-muted-fg);
  font-size: 16px;
}

.steps {
  display: grid;
  gap: 0;
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.2;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.step p {
  margin: 0;
  color: var(--color-muted-fg);
  font-size: 15px;
  max-width: 56ch;
}

.install-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
  counter-reset: install;
}

.install-step {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
  counter-increment: install;
}

.install-step h3 {
  margin: 0 0 8px;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.install-step h3::before {
  content: "0" counter(install) " · ";
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-weight: 600;
}

.install-step > p {
  margin: 0;
  color: var(--color-muted-fg);
  font-size: 15px;
  max-width: 64ch;
}

.install-hint {
  margin-top: 10px !important;
  font-size: 13px !important;
}

.install-paths {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  max-width: 64ch;
}

.install-paths li {
  position: relative;
  padding-left: 16px;
  color: var(--color-muted-fg);
  font-size: 14px;
  line-height: 1.5;
}

.install-paths li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.8;
}

.code-row {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: stretch;
}

.code-row code {
  flex: 1 1 280px;
  display: block;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-foreground);
  overflow-x: auto;
  line-height: 1.45;
}

.btn-copy {
  min-height: 44px;
  padding: 10px 14px;
  font-size: 13px;
  white-space: nowrap;
}

.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 40px;
  padding-top: 8px;
}

.feature {
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.feature-icon {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.feature h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.feature p {
  margin: 0;
  color: var(--color-muted-fg);
  font-size: 14px;
  max-width: 42ch;
}

.pricing {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.plan {
  padding: 28px 0 8px;
  border-top: 1px solid var(--color-border);
}

.plan-pro {
  border-top-color: rgba(56, 189, 248, 0.55);
}

.plan h3 {
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: -0.03em;
}

.plan-tag {
  margin: 0 0 20px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.plan-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.plan-list li {
  position: relative;
  padding-left: 22px;
  color: var(--color-muted-fg);
  font-size: 15px;
}

.plan-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.85;
}

.plan-note {
  margin: 20px 0 0;
  color: var(--color-muted-fg);
  font-size: 13px;
}

.faq-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 0;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 28px 20px 0;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  position: relative;
  transition: color var(--duration) var(--ease);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 20px;
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 18px;
  line-height: 1;
}

.faq-item[open] summary::after { content: "–"; }
.faq-item summary:hover { color: var(--color-accent); }
.faq-item summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

.faq-item p {
  margin: 0 0 20px;
  max-width: 64ch;
  color: var(--color-muted-fg);
  font-size: 15px;
}

.cta-band {
  padding-top: 24px;
  padding-bottom: 96px;
}

.cta-band-inner {
  padding-top: 36px;
  border-top: 1px solid var(--color-border);
  max-width: 42ch;
}

.cta-band h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 28px);
}

.cta-band p {
  margin: 0 0 24px;
  color: var(--color-muted-fg);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 28px 24px 40px;
  color: var(--color-muted-fg);
  font-size: 13px;
}

.footer-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-mono);
  color: var(--color-foreground);
  font-weight: 600;
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-stage {
    min-height: 300px;
    max-width: 520px;
  }
  .stage-guest {
    top: 56px;
  }
}

@media (max-width: 860px) {
  .features { grid-template-columns: 1fr; }
  .pricing { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero-plane { mask-image: linear-gradient(180deg, #000 10%, transparent 85%); }
}

@media (max-width: 560px) {
  .hero { padding: 48px 20px 56px; }
  .step { grid-template-columns: 48px 1fr; gap: 12px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
  .btn-nav { display: none; }
  .stage-host { width: 100%; }
  .stage-guest {
    position: relative;
    top: auto;
    right: auto;
    width: 100%;
    margin-top: 16px;
  }
  .stage-beam { display: none; }
  .hero-stage { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .hero-brand, .hero h1, .hero-lead, .hero-cta, .hero-meta, .hero-stage {
    opacity: 1;
    transform: none;
  }
}