:root {
  --ink: #111418;
  --paper: #f6f4ef;
  --accent: #0c7b5b;
  --accent-2: #b05a1c;
  --mist: #e5e0d7;
  --cloud: #ffffff;
  --muted: #5a5f66;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
  --ambient-1: rgba(12, 123, 91, 0.18);
  --ambient-2: rgba(176, 90, 28, 0.18);
  --ambient-3: rgba(17, 20, 24, 0.08);
  --nav-bg: rgba(246, 244, 239, 0.85);
  --nav-border: rgba(17, 20, 24, 0.08);
  --panel-bg: #111418;
  --panel-ink: #f4f1ea;
  --panel-sub: #c7c2b7;
  --panel-title: #d6d2c7;
  --panel-inner: rgba(255, 255, 255, 0.06);
  --card-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  --meta-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  --footer-border: rgba(17, 20, 24, 0.1);
  --diagram-stroke: rgba(17, 20, 24, 0.18);
  --diagram-node: #ffffff;
  --diagram-node-stroke: rgba(17, 20, 24, 0.18);
  --diagram-label: #111418;
  --diagram-sublabel: #5a5f66;
}

:root[data-theme="dark"] {
  --ink: #ecebe7;
  --paper: #0e1115;
  --accent: #2fd6a6;
  --accent-2: #ff9e5a;
  --mist: #232830;
  --cloud: #161a20;
  --muted: #9aa0a8;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.55);
  --ambient-1: rgba(47, 214, 166, 0.16);
  --ambient-2: rgba(255, 158, 90, 0.14);
  --ambient-3: rgba(255, 255, 255, 0.05);
  --nav-bg: rgba(14, 17, 21, 0.82);
  --nav-border: rgba(255, 255, 255, 0.08);
  --panel-bg: #07090c;
  --panel-ink: #e8e6df;
  --panel-sub: #8a8e95;
  --panel-title: #b9bcc2;
  --panel-inner: rgba(255, 255, 255, 0.04);
  --card-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  --meta-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
  --footer-border: rgba(255, 255, 255, 0.08);
  --diagram-stroke: rgba(255, 255, 255, 0.22);
  --diagram-node: #161a20;
  --diagram-node-stroke: rgba(255, 255, 255, 0.18);
  --diagram-label: #ecebe7;
  --diagram-sublabel: #9aa0a8;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: "Space Grotesk", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  transition: background 0.35s ease, color 0.35s ease;
}

.ambient {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(60% 50% at 15% 10%, var(--ambient-1), transparent 60%),
    radial-gradient(50% 50% at 90% 5%, var(--ambient-2), transparent 55%),
    radial-gradient(40% 40% at 80% 80%, var(--ambient-3), transparent 60%);
  z-index: -1;
  transition: background 0.35s ease;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 64px;
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  z-index: 10;
  transition: background 0.35s ease, border-color 0.35s ease;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo img {
  width: 36px;
  height: 36px;
}

nav {
  display: flex;
  gap: 24px;
  font-size: 0.95rem;
}

nav a,
.cta,
.primary,
.secondary {
  color: inherit;
  text-decoration: none;
}

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

.theme-toggle {
  appearance: none;
  background: transparent;
  border: 1px solid var(--nav-border);
  color: inherit;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  background: var(--cloud);
  transform: translateY(-1px);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  display: block;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

.cta {
  background: var(--ink);
  color: var(--paper);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.9rem;
}

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 48px;
  padding: 80px 64px 40px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(2.6rem, 4vw, 4.4rem);
  line-height: 1.05;
  margin: 12px 0 18px;
}

.hero-copy p {
  font-size: 1.05rem;
  max-width: 520px;
}

.eyebrow {
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.2rem;
  color: var(--accent-2);
}

.accent {
  color: var(--accent);
  position: relative;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 24px;
}

.primary {
  background: var(--accent);
  color: var(--paper);
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
}

.secondary {
  border: 1px solid var(--ink);
  padding: 12px 20px;
  border-radius: 999px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.hero-meta div {
  background: var(--cloud);
  border: 1px solid var(--mist);
  border-radius: 16px;
  padding: 12px 16px;
  box-shadow: var(--meta-shadow);
}

.hero-meta span {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12rem;
  color: var(--accent-2);
}

.hero-panel {
  background: var(--panel-bg);
  color: var(--panel-ink);
  padding: 28px;
  border-radius: 28px;
  box-shadow: var(--shadow);
  font-family: "IBM Plex Mono", monospace;
}

.panel-line {
  font-size: 0.85rem;
  color: var(--panel-sub);
}

.panel-block {
  margin-top: 24px;
  background: var(--panel-inner);
  padding: 16px;
  border-radius: 16px;
}

.panel-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  margin-bottom: 8px;
  color: var(--panel-title);
}

.panel-block pre {
  margin: 0;
  white-space: pre-wrap;
  font-size: 0.8rem;
}

.section {
  padding: 64px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.section-head h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  margin: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card {
  background: var(--cloud);
  border: 1px solid var(--mist);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--card-shadow);
}

.card h3 {
  margin-top: 0;
}

.card ul {
  padding-left: 18px;
  margin: 16px 0 0;
}

.arch-diagram {
  background: var(--cloud);
  border: 1px solid var(--mist);
  border-radius: 24px;
  padding: 28px;
  margin-bottom: 32px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.arch-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.arch-diagram .node-rect {
  fill: var(--diagram-node);
  stroke: var(--diagram-node-stroke);
  stroke-width: 1.5;
  transition: fill 0.35s ease, stroke 0.35s ease;
}

.arch-diagram .node-label {
  fill: var(--diagram-label);
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-weight: 600;
  font-size: 14px;
  transition: fill 0.35s ease;
}

.arch-diagram .node-sub {
  fill: var(--diagram-sublabel);
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  transition: fill 0.35s ease;
}

.arch-diagram .node-icon {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.arch-diagram .diagram-grid {
  stroke: var(--diagram-stroke);
  stroke-width: 0.6;
  opacity: 0.18;
  fill: none;
}

.arch-diagram .node-glow {
  opacity: 0.9;
  animation: glow-breathe 5.5s ease-in-out infinite;
}

.arch-diagram .node-glow:nth-of-type(2) { animation-delay: 0.7s; }
.arch-diagram .node-glow:nth-of-type(3) { animation-delay: 1.4s; }
.arch-diagram .node-glow:nth-of-type(4) { animation-delay: 2.1s; }

.arch-diagram .flow-line {
  fill: none;
  stroke: var(--diagram-stroke);
  stroke-width: 1.5;
  stroke-dasharray: 4 6;
  transition: stroke 0.35s ease;
}

.arch-diagram .return-path {
  stroke: var(--accent);
  stroke-opacity: 0.45;
  stroke-dasharray: 3 7;
}

.arch-diagram .flow-pulse {
  fill: var(--accent);
  filter: drop-shadow(0 0 6px var(--accent));
}

.arch-diagram .pulse-1 {
  animation: pulse-travel 5s linear infinite;
}

.arch-diagram .pulse-2 {
  animation: pulse-travel 5s linear infinite;
  animation-delay: 1.2s;
}

.arch-diagram .pulse-3 {
  animation: pulse-travel 5s linear infinite;
  animation-delay: 2.4s;
}

.arch-diagram .pulse-back-bs {
  animation: pulse-travel 5s linear infinite;
  animation-delay: 3.6s;
  filter: drop-shadow(0 0 7px var(--accent));
}

.arch-diagram .pulse-return {
  animation: pulse-travel 7s linear infinite;
  animation-delay: 4.8s;
  filter: drop-shadow(0 0 8px var(--accent));
}

.arch-diagram .edge-label {
  fill: var(--diagram-sublabel);
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  transition: fill 0.35s ease;
}

.arch-diagram .return-label {
  fill: var(--accent);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.arch-diagram .node-rect {
  filter: drop-shadow(0 6px 14px rgba(0, 0, 0, 0.12));
}

.arch-diagram .node-group {
  transform-box: fill-box;
  transform-origin: center;
  animation: node-breathe 6s ease-in-out infinite;
}

.arch-diagram .node-group:nth-of-type(1) { animation-delay: 0s; }
.arch-diagram .node-group:nth-of-type(2) { animation-delay: 0.6s; }
.arch-diagram .node-group:nth-of-type(3) { animation-delay: 1.2s; }
.arch-diagram .node-group:nth-of-type(4) { animation-delay: 1.8s; }

@keyframes node-breathe {
  0%, 100% { opacity: 0.96; }
  50% { opacity: 1; }
}

@keyframes glow-breathe {
  0%, 100% { opacity: 0.55; transform: scale(0.96); transform-origin: center; transform-box: fill-box; }
  50% { opacity: 1; transform: scale(1.06); }
}

@keyframes pulse-travel {
  0% { offset-distance: 0%; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

.arch-diagram .pulse-1 { offset-path: path('M 110 170 L 245 170'); }
.arch-diagram .pulse-2 { offset-path: path('M 365 170 L 495 170'); }
.arch-diagram .pulse-3 { offset-path: path('M 615 170 L 810 170'); }
.arch-diagram .pulse-back-bs { offset-path: path('M 495 200 Q 430 235, 365 200'); }
.arch-diagram .pulse-return { offset-path: path('M 860 120 C 860 30, 60 30, 60 120'); }

@media (prefers-reduced-motion: reduce) {
  .arch-diagram .pulse-1,
  .arch-diagram .pulse-2,
  .arch-diagram .pulse-3,
  .arch-diagram .pulse-back-bs,
  .arch-diagram .pulse-return,
  .arch-diagram .node-group,
  .arch-diagram .node-glow {
    animation: none;
  }
  .arch-diagram .flow-pulse {
    display: none;
  }
}

.timeline {
  display: grid;
  gap: 16px;
}

.step {
  display: flex;
  gap: 16px;
  align-items: center;
  background: var(--cloud);
  border-radius: 16px;
  padding: 16px 20px;
  border: 1px solid var(--mist);
}

.step span {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-2);
  color: var(--paper);
  display: grid;
  place-items: center;
  font-weight: 700;
}

.api-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.api-block {
  background: var(--cloud);
  border: 1px solid var(--mist);
  border-radius: 18px;
  padding: 20px;
}

.api-block code {
  display: inline-block;
  margin-top: 8px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  color: var(--accent);
}

.run-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.run-block {
  background: var(--panel-bg);
  color: var(--panel-ink);
  border-radius: 16px;
  padding: 20px;
}

.run-block pre {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  margin: 0;
  white-space: pre-wrap;
}

footer {
  padding: 56px 64px 32px;
  border-top: 1px solid var(--footer-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 280px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}

.footer-logo img {
  width: 22px;
  height: 22px;
}

.footer-logo strong {
  font-size: 0.95rem;
  letter-spacing: 0.3px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col h5 {
  margin: 0 0 6px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.16rem;
  color: var(--muted);
  font-weight: 600;
}

.footer-col a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--footer-border);
  font-size: 0.82rem;
  color: var(--muted);
}

.footer-bottom a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-bottom a:hover {
  color: var(--accent);
}

.footer-bottom .back-top {
  font-weight: 500;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

@media (max-width: 840px) {
  .nav {
    flex-direction: column;
    gap: 16px;
    padding: 20px 24px;
  }

  nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero,
  .section {
    padding: 48px 24px;
  }

  footer {
    padding: 40px 24px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  .nav {
    padding: 16px 18px;
  }

  nav {
    gap: 12px;
    row-gap: 8px;
  }

  .cta {
    width: 100%;
    text-align: center;
  }

  .hero {
    padding: 36px 18px 24px;
  }

  .hero-actions {
    flex-wrap: wrap;
  }

  .hero-actions a {
    flex: 1 1 100%;
    text-align: center;
  }

  .hero-panel {
    padding: 20px;
  }

  .hero-meta {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 36px 18px;
  }

  .section-head {
    align-items: flex-start;
  }

  .step {
    flex-direction: column;
    align-items: flex-start;
  }

  .arch-diagram {
    padding: 16px;
  }

  footer {
    padding: 32px 18px 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}