/* UIFlow landing — paper blueprint on deep navy (matches product icon). */

:root {
  --ink: #071422;
  --navy: #0c1f38;
  --navy-lift: #143052;
  --paper: #ebe4d6;
  --paper-deep: #d9cfbc;
  --line: rgba(235, 228, 214, 0.14);
  --mute: #8b96a8;
  --text: #e8eef7;
  --godot: #4a90c4;
  --teal: #3db8a8;
  --lilac: #9b8bc4;
  --ok: #2f9e8f;
  --shadow: rgba(0, 0, 0, 0.45);
  --display: "Fraunces", "Times New Roman", serif;
  --sans: "Sora", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --pad: clamp(1.25rem, 4vw, 3.5rem);
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(ellipse 80% 50% at 70% 0%, rgba(74, 144, 196, 0.18), transparent 55%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(61, 184, 168, 0.08), transparent 50%),
    linear-gradient(165deg, var(--ink) 0%, var(--navy) 48%, #0a1830 100%);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

a {
  color: var(--godot);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #7eb6de;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  color: var(--paper);
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem var(--pad);
  backdrop-filter: blur(14px);
  background: rgba(7, 20, 34, 0.72);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.brand img {
  border-radius: 8px;
  box-shadow: 0 6px 18px var(--shadow);
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1.1rem;
  font-size: 0.92rem;
}

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

.top-nav a:hover {
  color: var(--paper);
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 5.5rem) var(--pad) 3rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--teal);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.4rem, 9vw, 5.6rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.lede {
  margin: 1.25rem 0 0;
  max-width: 34rem;
  color: #c5d0e0;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  font-weight: 400;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.meta {
  margin: 1.1rem 0 0;
  color: var(--mute);
  font-size: 0.88rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
  background: var(--navy-lift);
  border-color: var(--line);
  color: var(--paper);
}

.btn-primary {
  background: linear-gradient(135deg, var(--godot), #356f9c);
  color: #f7fbff;
  box-shadow: 0 10px 28px rgba(74, 144, 196, 0.35);
}

.btn-primary:hover {
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: rgba(235, 228, 214, 0.28);
  color: var(--paper);
}

.btn-ghost:hover {
  border-color: var(--paper);
  color: var(--paper);
}

.hero-art {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 280px;
}

.paper-glow {
  position: absolute;
  width: min(78%, 420px);
  aspect-ratio: 1;
  border-radius: 40% 36% 42% 38%;
  background: radial-gradient(circle, rgba(74, 144, 196, 0.45), transparent 68%);
  filter: blur(28px);
  animation: breathe 7s ease-in-out infinite;
}

.hero-icon {
  position: relative;
  width: min(100%, 440px);
  height: auto;
  border-radius: 28px;
  filter: drop-shadow(0 28px 50px rgba(0, 0, 0, 0.55));
  transition: transform 220ms ease-out;
  animation: rise-in 900ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.strip {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.5rem var(--pad) 3rem;
}

.flow-rail {
  list-style: none;
  margin: 0;
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(20, 48, 82, 0.35);
}

.flow-rail > li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  min-width: 5.5rem;
}

.flow-rail .rail {
  flex: 1 1 1.5rem;
  min-width: 1.5rem;
  height: 2px;
  margin-bottom: 1.4rem;
  background: linear-gradient(90deg, var(--godot), var(--teal), var(--lilac));
  opacity: 0.75;
}

.node {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.6rem;
  padding: 0.45rem 0.7rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.node-page {
  background: rgba(74, 144, 196, 0.2);
  border: 1.5px solid var(--godot);
  border-radius: 8px;
  color: #cfe4f5;
}

.node-decision {
  background: rgba(61, 184, 168, 0.16);
  border: 1.5px solid var(--teal);
  color: #c8f3ec;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  min-width: 5.2rem;
  min-height: 5.2rem;
  padding: 0;
}

.node-panel {
  background: rgba(155, 139, 196, 0.16);
  border: 1.5px solid var(--lilac);
  border-radius: 8px;
  color: #ddd4f5;
}

.node-ok {
  background: var(--ok);
  border-radius: 999px;
  color: #06241f;
}

.caption {
  color: var(--mute);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

.features,
.code-block,
.closing {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem var(--pad);
}

.section-head {
  max-width: 38rem;
  margin-bottom: 2rem;
}

.section-head h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.section-head p {
  margin: 0.75rem 0 0;
  color: var(--mute);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}

.feature-list article {
  margin: 0;
  padding: 1.4rem 1.35rem 1.55rem;
  background: rgba(12, 31, 56, 0.92);
}

.feature-list h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--paper);
}

.feature-list p {
  margin: 0;
  color: #a7b3c5;
  font-size: 0.95rem;
}

.sheet {
  margin: 0;
  padding: 1.35rem 1.4rem;
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid rgba(235, 228, 214, 0.18);
  background:
    linear-gradient(180deg, rgba(235, 228, 214, 0.08), transparent 40%),
    #121c2b;
  color: #d7dde8;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.65;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04), 0 18px 40px var(--shadow);
}

.sheet .k { color: #7eb6de; }
.sheet .f { color: var(--teal); }

.closing-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem 1.5rem;
  align-items: center;
  padding: 1.5rem 1.6rem;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(74, 144, 196, 0.18), rgba(61, 184, 168, 0.08));
  border: 1px solid rgba(235, 228, 214, 0.16);
}

.closing-card img {
  border-radius: 16px;
  box-shadow: 0 12px 28px var(--shadow);
}

.closing-card h2 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--paper);
}

.closing-card p {
  margin: 0.55rem 0 0;
  color: var(--mute);
}

.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem var(--pad) 2.75rem;
  color: var(--mute);
  font-size: 0.88rem;
  border-top: 1px solid var(--line);
}

.foot a {
  color: var(--mute);
}

.foot a:hover {
  color: var(--paper);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(28px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 0.75; }
  50% { transform: scale(1.08); opacity: 1; }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .hero-art {
    order: -1;
  }

  .hero-icon {
    width: min(72vw, 320px);
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .flow-rail .rail {
    display: none;
  }

  .closing-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .top-nav a:not(.btn) {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-icon,
  .paper-glow,
  .btn {
    animation: none !important;
    transition: none !important;
  }
}