:root {
  --paper: #EDEAE2;
  --ink: #1A1A18;
  --ink-soft: #4B4A45;
  --slate: #4A5A66;
  --slate-line: #C9C4B8;
  --storm-navy: #0C1420;
  --storm-mist: #8FA3B0;
  --transition-slow: 900ms cubic-bezier(.2,.8,.2,1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Fraunces', serif;
  transition: background var(--transition-slow), color var(--transition-slow);
}

body.storm {
  background: var(--storm-navy);
  color: var(--storm-mist);
}

.frame {
  max-width: 640px;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.masthead {
  text-align: center;
  margin-bottom: 3rem;
}

.eyebrow {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.6rem;
  transition: color var(--transition-slow);
}

body.storm .eyebrow { color: var(--storm-mist); opacity: 0.6; }

h1 {
  font-weight: 500;
  font-size: 2.4rem;
  letter-spacing: -0.01em;
  margin: 0;
}

.stage { flex: 1; display: flex; flex-direction: column; align-items: center; }

.loading {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-top: 3rem;
}

.plate {
  width: 100%;
  animation: rise 700ms ease both;
}

.text-card {
  width: 100%;
  padding: 2.2rem 1.8rem;
  background: rgba(255,255,255,0.4);
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 1.25rem;
  line-height: 1.6;
  font-style: italic;
  white-space: pre-wrap;
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

body.storm .text-card {
  background: rgba(255,255,255,0.03);
  border-color: rgba(143,163,176,0.25);
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.meta-strip {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--slate);
  border-top: 1px solid var(--slate-line);
  margin-top: 0.9rem;
  padding-top: 0.6rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  transition: color var(--transition-slow), border-color var(--transition-slow);
}

body.storm .meta-strip {
  color: var(--storm-mist);
  border-color: rgba(143,163,176,0.25);
}

.plate-pair {
  display: flex;
  gap: 0.9rem;
  width: 100%;
  animation: rise 700ms ease both;
}

.pair-item { flex: 1; min-width: 0; }
.pair-item .text-card { font-size: 1rem; padding: 1.4rem 1.2rem; }

.pair-prompt {
  font-style: italic;
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-align: center;
  margin: 1rem 0 0;
  transition: color var(--transition-slow);
}
body.storm .pair-prompt { color: var(--storm-mist); }

.pair-choices { margin-top: 0.6rem; }

.choice-neither {
  border-style: dashed;
}

.pair-accred {
  text-align: left;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  font-style: normal;
  line-height: 1.8;
}

.tag-ai, .tag-real {
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  margin-left: 0.3rem;
}
.tag-ai { background: rgba(138,59,46,0.12); color: var(--ai); }
.tag-real { background: rgba(74,107,78,0.12); color: var(--real); }
body.storm .tag-ai, body.storm .tag-real { background: rgba(143,163,176,0.12); color: var(--storm-mist); }

.choices {
  display: flex;
  gap: 0.75rem;
  margin-top: 2rem;
  width: 100%;
}

.choice-btn {
  flex: 1;
  padding: 0.9rem 1rem;
  font-family: 'Fraunces', serif;
  font-size: 1rem;
  font-style: italic;
  background: transparent;
  border: 1px solid var(--ink);
  color: var(--ink);
  cursor: pointer;
  border-radius: 2px;
  transition: background 200ms ease, color 200ms ease, border-color var(--transition-slow);
}

.choice-btn:hover { background: var(--ink); color: var(--paper); }

body.storm .choice-btn {
  border-color: var(--storm-mist);
  color: var(--storm-mist);
}
body.storm .choice-btn:hover { background: var(--storm-mist); color: var(--storm-navy); }

.reveal {
  width: 100%;
  animation: rise 500ms ease both;
  text-align: center;
}

.verdict {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.verdict.correct { color: #4A6B4E; }
.verdict.incorrect { color: #8A3B2E; }
body.storm .verdict.correct,
body.storm .verdict.incorrect { color: var(--storm-mist); }

.accreditation {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--ink-soft);
  margin-bottom: 1.6rem;
}
body.storm .accreditation { color: var(--storm-mist); }

.commentary {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--slate);
  border-top: 1px solid var(--slate-line);
  padding-top: 1.2rem;
  margin-bottom: 1.8rem;
  transition: color var(--transition-slow), border-color var(--transition-slow);
}
body.storm .commentary {
  color: var(--storm-mist);
  border-color: rgba(143,163,176,0.25);
}

.next-btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: none;
  border: none;
  border-bottom: 1px solid currentColor;
  color: var(--ink);
  cursor: pointer;
  padding: 0.2rem 0;
}
body.storm .next-btn { color: var(--storm-mist); }

.statusbar {
  display: flex;
  justify-content: space-between;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin-top: 3rem;
  opacity: 0.7;
  transition: color var(--transition-slow);
}
body.storm .statusbar { color: var(--storm-mist); }

.final {
  text-align: center;
  padding-top: 4rem;
  animation: rise 900ms ease both;
}

.final .verdict { margin-bottom: 1rem; }

.final p {
  font-style: italic;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--storm-mist);
}

.result-line {
  font-size: 1.25rem;
}

.tier-message {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  font-style: normal;
  letter-spacing: 0.01em;
  border-top: 1px solid rgba(143,163,176,0.25);
  padding-top: 1.4rem;
  margin-top: 1.4rem;
}

/* storm ambience */
.storm-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  z-index: 5;
  transition: opacity 1400ms ease;
  background:
    repeating-linear-gradient(100deg, rgba(255,255,255,0.015) 0px, rgba(255,255,255,0.015) 1px, transparent 1px, transparent 3px);
}

body.storm .storm-overlay { opacity: 1; }

@media (max-width: 480px) {
  h1 { font-size: 1.9rem; }
  .plate-pair { flex-direction: column; }
}

/* ---- onboarding / intro sequence ---- */

.intro-step {
  width: 100%;
  padding-top: 2rem;
  animation: rise 700ms ease both;
}

.intro-line {
  font-size: 1.3rem;
  line-height: 1.6;
  margin-bottom: 1.1rem;
}

.intro-input {
  width: 100%;
  font-family: 'Fraunces', serif;
  font-size: 1.1rem;
  padding: 0.7rem 0.8rem;
  border: none;
  border-bottom: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  margin-bottom: 1.2rem;
}
.intro-input:focus { outline: none; }

.calibration-pair {
  display: flex;
  gap: 1rem;
  margin: 2rem 0 1rem;
}

.calibration-word {
  flex: 1;
  text-align: center;
  padding: 2.4rem 1rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 1.4rem;
  font-style: italic;
  cursor: pointer;
  background: rgba(255,255,255,0.35);
  transition: background 150ms ease, border-color 150ms ease;
}
.calibration-word:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ---- prompt labels above each text card ---- */

.prompt-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--slate);
  margin-bottom: 0.6rem;
  line-height: 1.4;
  transition: color var(--transition-slow);
}
body.storm .prompt-label { color: var(--storm-mist); opacity: 0.7; }

/* ---- inline "answer it yourself" form ---- */

.respond-toggle { margin-top: 1.4rem; }

.link-btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  background: none;
  border: none;
  border-bottom: 1px solid currentColor;
  color: var(--ink-soft);
  cursor: pointer;
  padding: 0.2rem 0;
}
body.storm .link-btn { color: var(--storm-mist); }

.respond-form {
  margin-top: 1rem;
  text-align: left;
}

.respond-textarea {
  width: 100%;
  min-height: 5rem;
  font-family: 'Fraunces', serif;
  font-size: 0.95rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--slate-line);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  margin-top: 0.5rem;
  resize: vertical;
}

.respond-hint {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  color: var(--ink-soft);
  margin-top: 0.4rem;
}

.notice {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  padding: 0.7rem 0.9rem;
  border-radius: 2px;
  margin-top: 0.8rem;
}
.notice.error { background: rgba(138,59,46,0.1); color: var(--ai); }
.notice.success { background: rgba(74,107,78,0.1); color: var(--real); }

@media (max-width: 480px) {
  .calibration-pair { flex-direction: column; }
}