:root {
  color-scheme: light;
  --ink: #1a1c1f;
  --muted: #55606f;
  --paper: #f6f1ea;
  --sun: #f9c77e;
  --sky: #99c4f2;
  --plum: #4b3f72;
  --forest: #1f3b2c;
  --card: #ffffff;
  --stroke: rgba(26, 28, 31, 0.12);
  --shadow: 0 20px 50px rgba(26, 28, 31, 0.12);
  --radius: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Literata", "Iowan Old Style", "Palatino Linotype", serif;
  color: var(--ink);
  background: linear-gradient(160deg, #f8f3ea 0%, #e9f0f9 50%, #fef6e8 100%);
  min-height: 100vh;
}

h1,
.panel-title {
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(0px);
  opacity: 0.35;
}

.orb-one {
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, #f9c77e 0%, rgba(249, 199, 126, 0) 70%);
  top: -120px;
  left: -120px;
}

.orb-two {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, #99c4f2 0%, rgba(153, 196, 242, 0) 70%);
  right: -140px;
  top: 20vh;
}

.orb-three {
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, #c6a9f7 0%, rgba(198, 169, 247, 0) 70%);
  bottom: -140px;
  left: 20vw;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 64px 24px 120px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 12px;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--forest);
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.05;
  margin: 0 0 16px;
}

.lede {
  font-size: 18px;
  max-width: 560px;
  color: var(--muted);
  margin: 0;
}

.hero-panel,
.event-log,
.node-card {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 20px;
  display: grid;
  gap: 12px;
}

.panel-title {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--plum);
}

.panel-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
}

.label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.value {
  font-size: 13px;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

.panel-field {
  display: grid;
  gap: 6px;
  font-size: 12px;
}

.panel-field input {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

.ghost {
  background: transparent;
  border: 1px dashed var(--stroke);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  cursor: pointer;
}

.timeline {
  margin-top: 56px;
  display: grid;
  gap: 24px;
}

.start-stack {
  display: grid;
  gap: 24px;
}

.lanes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.lane {
  display: grid;
  align-content: start;
  transition: opacity 0.2s ease;
}

.lane.is-dim {
  opacity: 0.45;
}

.lane-stack {
  display: grid;
  gap: 24px;
}

.node-card {
  padding: 28px 28px 22px;
  display: grid;
  gap: 20px;
  position: relative;
}

.node-card.is-active {
  border-color: rgba(31, 59, 44, 0.35);
  box-shadow: 0 30px 60px rgba(31, 59, 44, 0.18);
}

.node-card.is-branch {
  border-left: 6px solid rgba(153, 196, 242, 0.6);
}

.branch-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--forest);
}

.node-card.is-new {
  animation: glideIn 0.5s ease;
}

@keyframes glideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.node-meta {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.statement {
  font-size: clamp(22px, 2.5vw, 30px);
  line-height: 1.3;
  margin: 0;
  white-space: pre-line;
}

.questions {
  display: grid;
  gap: 12px;
}

.question-btn {
  border: 1px solid var(--stroke);
  background: #f9f7f3;
  border-radius: 14px;
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

.question-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(31, 59, 44, 0.15);
}

.question-note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
}

.selected-note {
  background: rgba(153, 196, 242, 0.2);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--plum);
  white-space: pre-line;
}

.event-log {
  margin-top: 48px;
  padding: 20px;
}

.log {
  margin-top: 12px;
  display: grid;
  gap: 8px;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  font-size: 13px;
}

.log-entry {
  padding: 10px 12px;
  background: #fdfbf8;
  border-radius: 12px;
  border: 1px solid var(--stroke);
}

.muted {
  color: var(--muted);
  margin: 0;
}

.error {
  margin-top: 40px;
  padding: 24px;
  border-radius: var(--radius);
  background: #fff1f0;
  border: 1px solid #f2b6b3;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    order: 2;
  }
  .lanes {
    grid-template-columns: 1fr;
  }
}