:root {
  color-scheme: dark;
  --ink: #ffffff;
  --muted: rgba(255, 255, 255, 0.48);
  --paper: #030303;
  --card: #0b0b0b;
  --line: rgba(255, 255, 255, 0.16);
  --soft: rgba(255, 255, 255, 0.72);
  --faint: rgba(255, 255, 255, 0.07);
  --accent: #f5f5f2;
  --accent-ink: #030303;
  --danger: #ffb4b4;
  --danger-soft: rgba(255, 180, 180, 0.1);
  --success: #d8ffd8;
  --success-soft: rgba(216, 255, 216, 0.1);
  --shadow: 0 30px 90px rgba(0, 0, 0, 0.48);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px) 0 0 / 128px 128px,
    radial-gradient(circle at 70% 0%, rgba(255, 255, 255, 0.13), transparent 34rem),
    linear-gradient(180deg, #0b0b0b 0%, var(--paper) 46%, #000 100%);
}

button, input, textarea, select { font: inherit; }

button, a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible,
[tabindex="-1"]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-160%);
  padding: 0.7rem 1rem;
  color: white;
  background: var(--ink);
  border-radius: 999px;
}

.skip-link:focus { transform: translateY(0); }

.lab-header {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line);
  background: rgba(3, 3, 3, 0.9);
  backdrop-filter: blur(12px);
}

.lab-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.15rem;
  font-weight: 850;
  letter-spacing: -0.04em;
}

.lab-dot {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0.38rem rgba(255, 255, 255, 0.09);
}

.lab-status { text-align: right; }
.lab-status span, .lab-status strong { display: block; }
.lab-status span { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.14em; }
.lab-status strong { font-size: 0.88rem; }

.lab-shell {
  display: grid;
  grid-template-columns: minmax(220px, 285px) minmax(0, 1fr);
  width: min(1480px, 100%);
  min-height: calc(100vh - 148px);
  margin: 0 auto;
}

.lab-rail {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  padding: 2.5rem 1.4rem 2rem clamp(1rem, 3vw, 2.5rem);
  border-right: 1px solid var(--line);
}

.rail-label,
.eyebrow {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.journey-list { margin: 0; padding: 0; list-style: none; }
.journey-list li {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  align-items: center;
  min-height: 46px;
  color: rgba(255, 255, 255, 0.3);
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem;
}
.journey-list li span { font-size: 0.66rem; font-weight: 800; letter-spacing: 0.1em; }
.journey-list li.is-active { color: var(--ink); font-weight: 800; }
.journey-list li.is-complete { color: var(--success); }
.journey-list li.is-active span { color: var(--ink); }

.role-card,
.research-tools {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.045);
}

.role-card { padding: 1rem; }
.role-card span, .role-card strong, .role-card small { display: block; }
.role-card span { color: var(--muted); font-size: 0.72rem; }
.role-card strong { margin: 0.2rem 0 0.45rem; }
.role-card small { color: var(--muted); line-height: 1.45; }

.research-tools { padding: 0.2rem 1rem 1rem; }
.research-tools summary { padding: 0.8rem 0; cursor: pointer; font-weight: 800; }
.research-tools p { color: var(--muted); font-size: 0.78rem; line-height: 1.45; }
.tool-stack { display: grid; gap: 0.45rem; }
.tool-stack button,
.lab-footer button {
  border: 0;
  padding: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.2rem;
}

.prototype-stage {
  display: grid;
  place-items: center;
  min-width: 0;
  padding: clamp(1rem, 4vw, 4rem);
}

.prototype-view { width: min(960px, 100%); }

.screen-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 30px;
  background:
    radial-gradient(circle at 100% 0%, rgba(255, 255, 255, 0.07), transparent 25rem),
    var(--card);
  box-shadow: var(--shadow);
}

.screen-body { padding: clamp(1.35rem, 5vw, 4rem); }
.screen-body.narrow { max-width: 720px; margin: 0 auto; }

.screen-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2.3rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.045);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.screen-kicker::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.18);
}

h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2, h3 { margin: 0; letter-spacing: -0.055em; line-height: 0.98; }
h1 { max-width: 14ch; font-size: clamp(2.7rem, 7vw, 6.2rem); }
h2 { font-size: clamp(2rem, 5vw, 4.2rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.8rem); }

.lede {
  max-width: 650px;
  margin: 1.4rem 0 0;
  color: var(--soft);
  font-size: clamp(1.03rem, 2vw, 1.25rem);
  line-height: 1.6;
}

.small-copy { color: var(--muted); line-height: 1.55; font-size: 0.9rem; }
.muted { color: var(--muted); }

.action-row { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2rem; }
.stack-actions { display: grid; gap: 0.7rem; margin-top: 1.5rem; }

.primary-button,
.secondary-button,
.quiet-button,
.danger-button {
  min-height: 50px;
  border-radius: 999px;
  padding: 0.8rem 1.25rem;
  cursor: pointer;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease;
}

.primary-button { border: 1px solid var(--accent); color: var(--accent-ink); background: var(--accent); }
.primary-button:hover { transform: translateY(-2px); background: #fff; }
.secondary-button { border: 1px solid var(--line); color: var(--ink); background: rgba(255, 255, 255, 0.04); }
.secondary-button:hover { transform: translateY(-2px); border-color: var(--ink); }
.quiet-button { border: 0; color: var(--ink); background: transparent; text-decoration: underline; text-underline-offset: 0.22rem; }
.danger-button { border: 1px solid var(--danger); color: #170606; background: var(--danger); }
.danger-button:disabled, .primary-button:disabled { cursor: not-allowed; opacity: 0.45; transform: none; }

.promise-grid,
.choice-grid,
.profile-grid,
.split-layout,
.settings-grid,
.receipt-grid {
  display: grid;
  gap: 1rem;
  margin-top: 2.3rem;
}

.promise-grid { grid-template-columns: repeat(3, 1fr); }
.promise-grid article,
.choice-card,
.setting-card,
.receipt-item {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.035);
}
.promise-grid strong, .promise-grid span { display: block; }
.promise-grid span { margin-top: 0.5rem; color: var(--muted); font-size: 0.82rem; line-height: 1.45; }

.notice {
  margin: 1.5rem 0 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--accent);
  color: var(--soft);
  background: rgba(255, 255, 255, 0.07);
  line-height: 1.5;
}
.notice.success { border-color: var(--success); color: var(--success); background: var(--success-soft); }
.notice.danger { border-color: var(--danger); color: var(--danger); background: var(--danger-soft); }

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin-top: 2rem; }
.field { display: grid; gap: 0.45rem; }
.field.full { grid-column: 1 / -1; }
.field span, fieldset legend { font-size: 0.82rem; font-weight: 800; }
.field span em, fieldset legend em { margin-left: 0.35rem; color: var(--muted); font-size: 0.72rem; font-style: normal; font-weight: 600; }
.required-mark { color: var(--success); }
.field small { color: var(--muted); line-height: 1.4; }
.field input, .field textarea, .field select {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 12px;
  padding: 0.85rem 0.9rem;
  color: var(--ink);
  background: #050505;
}
.field textarea { resize: vertical; min-height: 110px; }
.field input::placeholder, .field textarea::placeholder { color: rgba(255, 255, 255, 0.42); }
.url-preview { display: block; overflow-wrap: anywhere; }
.url-preview strong { color: var(--soft); }
.open-to-field { min-width: 0; margin: 0; padding: 0; border: 0; }
.choice-chip-grid { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.choice-chip { position: relative; cursor: pointer; }
.choice-chip input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.choice-chip span {
  display: block;
  min-height: 42px;
  padding: 0.68rem 0.82rem;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  color: var(--soft);
  background: #050505;
  font-size: 0.76rem;
  line-height: 1.25;
}
.choice-chip input:checked + span { border-color: var(--accent); color: var(--accent-ink); background: var(--accent); }
.choice-chip input:focus-visible + span { outline: 3px solid var(--ink); outline-offset: 3px; }
.selection-summary { display: block; margin-top: 0.2rem; overflow-wrap: anywhere; }

.check-row {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  grid-column: 1 / -1;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.035);
  line-height: 1.45;
}
.check-row input { margin-top: 0.2rem; width: 1.1rem; height: 1.1rem; }

.profile-grid { grid-template-columns: 1.1fr 0.9fr; align-items: start; }
.profile-card {
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: 25px;
  background: rgba(255, 255, 255, 0.035);
}
.avatar {
  display: grid;
  place-items: center;
  width: 5rem;
  height: 5rem;
  margin-bottom: 2rem;
  border-radius: 50%;
  color: var(--accent-ink);
  background: var(--accent);
  font-size: 1.7rem;
  font-weight: 900;
}
.profile-card h2 { font-size: clamp(2.2rem, 5vw, 4rem); }
.profile-card .handle { color: var(--muted); font-weight: 700; }
.profile-card .bio { margin: 1.2rem 0; font-size: 1.05rem; line-height: 1.55; }
.tag-row { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.tag-row span { padding: 0.45rem 0.7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: rgba(255, 255, 255, 0.055); font-size: 0.76rem; font-weight: 800; }

.visibility-card { padding: 1.4rem; border-radius: 22px; color: var(--accent-ink); background: var(--accent); }
.visibility-card span, .visibility-card strong { display: block; }
.visibility-card strong { margin: 0.4rem 0 1rem; font-size: 1.3rem; }
.visibility-list { margin: 0; padding-left: 1.1rem; color: rgba(3, 3, 3, 0.7); line-height: 1.65; font-size: 0.86rem; }

.code-layout { display: grid; grid-template-columns: minmax(230px, 0.7fr) 1.3fr; gap: 2rem; align-items: center; margin-top: 2rem; }
.code-card { display: grid; place-items: center; min-height: 320px; padding: 1.6rem; border-radius: 28px; background: var(--ink); }
.fake-qr { display: grid; grid-template-columns: repeat(13, 1fr); width: min(250px, 75vw); aspect-ratio: 1; padding: 8%; gap: 2px; border-radius: 16px; background: white; }
.fake-qr i { display: block; background: transparent; }
.fake-qr i.on { background: var(--ink); }
.code-status { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 800; }
.code-status::before { content: ""; width: 0.7rem; height: 0.7rem; border-radius: 50%; background: var(--success); }
.code-status.paused::before { background: #d8d8d4; }

.scan-shell { max-width: 620px; margin: 0 auto; }
.scan-symbol { display: grid; place-items: center; width: 4.8rem; height: 4.8rem; margin-bottom: 2rem; border-radius: 22px; color: var(--accent-ink); background: var(--accent); font-size: 1.5rem; font-weight: 950; }
.truth-list { display: grid; gap: 0.7rem; margin: 1.8rem 0; }
.truth-list div { display: flex; gap: 0.7rem; padding: 0.9rem 0; border-bottom: 1px solid var(--line); line-height: 1.45; }
.truth-list strong { color: var(--success); }

.request-card { padding: 1.4rem; border: 1px solid var(--line); border-radius: 20px; background: rgba(255, 255, 255, 0.035); }
.request-meta { display: flex; justify-content: space-between; gap: 1rem; color: var(--muted); font-size: 0.82rem; }
.request-message { margin: 1.2rem 0; padding: 1.1rem; border: 1px solid var(--line); border-radius: 14px; background: #050505; line-height: 1.55; }

.choice-grid { grid-template-columns: repeat(2, 1fr); }
.choice-card { display: grid; align-content: start; gap: 0.6rem; min-height: 150px; text-align: left; cursor: pointer; }
.choice-card:hover { border-color: var(--ink); }
.choice-card span { color: var(--muted); line-height: 1.4; font-size: 0.82rem; }
.choice-card.danger { border-color: rgba(255, 180, 180, 0.5); background: var(--danger-soft); }

.connection-banner { padding: 1.4rem; border: 1px solid rgba(216, 255, 216, 0.35); border-radius: 22px; color: var(--success); background: var(--success-soft); }
.connection-banner strong { display: block; font-size: 1.3rem; }
.connection-banner p { margin-bottom: 0; line-height: 1.5; }

.settings-grid { grid-template-columns: repeat(2, 1fr); }
.setting-card { display: grid; gap: 0.8rem; }
.setting-card p { margin: 0; color: var(--muted); line-height: 1.5; }
.setting-card .primary-button, .setting-card .secondary-button, .setting-card .danger-button { justify-self: start; }

.receipt-grid { grid-template-columns: repeat(2, 1fr); }
.receipt-item span, .receipt-item strong { display: block; }
.receipt-item span { color: var(--muted); font-size: 0.75rem; }
.receipt-item strong { margin-top: 0.25rem; }

.status-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.2rem;
  color: var(--accent-ink);
  background: var(--accent);
}
.status-banner span { font-size: 0.8rem; }
.status-banner strong { font-size: 0.85rem; }

.uncertain-panel { padding: 1.3rem; border: 1px solid rgba(255, 255, 255, 0.32); border-radius: 18px; background: rgba(255, 255, 255, 0.07); }
.uncertain-panel p { line-height: 1.5; }

.lab-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.75rem;
}
.lab-footer p { margin: 0; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

@media (max-width: 920px) {
  .lab-shell { grid-template-columns: 1fr; }
  .lab-rail { display: block; padding: 1rem; border-right: 0; border-bottom: 1px solid var(--line); }
  .rail-label, .journey-list, .role-card { display: none; }
  .research-tools { max-width: 100%; }
  .prototype-stage { padding: 1rem; }
  .promise-grid, .profile-grid, .code-layout { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .lab-header { min-height: 68px; }
  .lab-status strong { font-size: 0.76rem; }
  .screen-card { border-radius: 22px; }
  .form-grid, .choice-grid, .settings-grid, .receipt-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .action-row { display: grid; }
  .action-row button { width: 100%; }
  .choice-chip-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .choice-chip span { display: grid; place-items: center; height: 100%; text-align: center; }
  .lab-footer { display: grid; }
}