:root {
  --bg: #f4f7fb;
  --bg-grad: linear-gradient(165deg, #eef4fc 0%, #f8fafc 50%, #fff 100%);
  --surface: #ffffff;
  --border: #d8e2ef;
  --text: #1a2332;
  --muted: #5a6b82;
  --accent: #2563eb;
  --accent-dim: #1d4ed8;
  --ok: #16a34a;
  --warn: #d97706;
  --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'SF Mono', 'Fira Code', Consolas, monospace;
  --shadow: 0 4px 24px rgba(26, 35, 50, 0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  background: var(--bg-grad);
  color: var(--text);
  line-height: 1.65;
}

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

/* Top nav */
.site-top {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-top-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none !important;
}

.logo span { color: var(--accent); }

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  font-size: 0.9rem;
}

.top-nav a { color: var(--muted); text-decoration: none; }
.top-nav a:hover { color: var(--accent); }

.btn-npm {
  background: var(--accent);
  color: #fff !important;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none !important;
}

.btn-npm:hover { background: var(--accent-dim); }

/* Layout */
.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.section-label {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}

section { margin-bottom: 3.5rem; }

h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.lead {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 38rem;
  margin: 0 0 1.25rem;
}

.lead strong { color: var(--text); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
  padding: 2.5rem 0 3rem;
}

@media (max-width: 800px) {
  .hero { grid-template-columns: 1fr; }
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0;
}

.hero-badges img { height: 22px; }

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none !important;
  font-size: 0.95rem;
}

.btn:hover { background: var(--accent-dim); }

.btn-outline {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text) !important;
}

/* Pipeline card */
.diagram-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.35rem;
  box-shadow: var(--shadow);
}

.diagram-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
}

.diagram-card .diagram-sub {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.pipe-step {
  flex: 1 1 4.5rem;
  min-width: 4rem;
  padding: 0.55rem 0.35rem;
  border-radius: 8px;
  text-align: center;
  border: 1px solid transparent;
}

.pipe-title { display: block; font-weight: 700; font-size: 0.78rem; }
.pipe-sub { display: block; font-size: 0.65rem; color: var(--muted); margin-top: 0.15rem; }
.pipe-arrow { color: var(--muted); font-size: 1rem; flex: 0 0 auto; }

.pipe-input { background: #e8f4fc; border-color: #b8daf0; }
.pipe-secret { background: #fff3e6; border-color: #f5d4a8; }
.pipe-proof { background: #f3ecfc; border-color: #d4c4f0; }
.pipe-verify { background: #e8f8ee; border-color: #b8e6c8; }
.pipe-output { background: var(--accent); color: #fff; }
.pipe-output .pipe-sub { color: rgba(255,255,255,0.88); }

.compare-bar {
  display: flex;
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  background: #e2e8f0;
  margin: 0.5rem 0 0.35rem;
}

.bar-prove { background: #f59e0b; width: 35%; }
.bar-verify { background: #22c55e; width: 8%; }

.compare-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--muted);
}

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

@media (max-width: 720px) { .cards-3 { grid-template-columns: 1fr; } }

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.feature-card .icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.icon-orange { background: #fff3e6; }
.icon-purple { background: #f3ecfc; }
.icon-green { background: #e8f8ee; }

.feature-card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.feature-card p { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* Two column */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }

.info-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

/* Use-case flow */
.usecase-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
}

.flow-box {
  flex: 1 1 5rem;
  padding: 0.6rem;
  border-radius: 8px;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--border);
}

.flow-box small { display: block; font-weight: 400; color: var(--muted); font-size: 0.65rem; margin-top: 0.2rem; }
.flow-a { background: #e8f4fc; }
.flow-b { background: #fff3e6; }
.flow-c { background: #f3ecfc; }
.flow-d { background: #e8f8ee; }
.flow-e { background: var(--accent); color: #fff; }
.flow-e small { color: rgba(255,255,255,0.85); }

.callout {
  background: #fffbf5;
  border: 1px solid #f5d4a8;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 1rem;
}

.callout strong { color: #b45309; }

.lib-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 720px) { .lib-cards { grid-template-columns: 1fr; } }

.lib-card h3 { color: var(--accent); margin: 0 0 0.5rem; font-size: 1rem; }
.lib-card p { margin: 0; font-size: 0.88rem; color: var(--muted); }

pre {
  background: #1a2332;
  color: #e7ecf3;
  border-radius: 10px;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  margin: 0.75rem 0;
}

code { font-family: var(--mono); font-size: 0.88em; background: #eef2f7; padding: 0.1em 0.35em; border-radius: 4px; color: #1e40af; }
pre code { background: none; padding: 0; color: inherit; }

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.link-pill {
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none !important;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.link-pill.primary { background: var(--accent); color: #fff; border-color: var(--accent); }

footer {
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

.pill {
  display: inline-block;
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-weight: 600;
}
.pill-ok { background: #dcfce7; color: var(--ok); }
.pill-warn { background: #ffedd5; color: var(--warn); }

.lang-select {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
}

.site-top-inner .lang-select {
  margin-left: 0.25rem;
}

html.i18n-pending body {
  opacity: 0;
}

html.i18n-ready body {
  opacity: 1;
  transition: opacity 0.12s ease;
}