:root{
  --cream:#F6F2E9;
  --cream-deep:#EFE9DA;
  --card:#FFFFFF;
  --ink:#2A241C;
  --ink-soft:#6E6656;
  --line:#E3DAC6;
  --accent:#B5502F;
  --accent-dark:#963F23;
  --real:#3F7D58;
  --real-bg:#EAF3EC;
  --fake:#B23A2B;
  --fake-bg:#FBEAE6;
  --radius:14px;
}

*{ box-sizing:border-box; }

html{ scroll-behavior:smooth; }

body{
  margin:0;
  background-color:var(--cream);
  color:var(--ink);
  font-family:'Inter', sans-serif;
  -webkit-font-smoothing:antialiased;
}

.grain{
  position:fixed;
  inset:0;
  pointer-events:none;
  opacity:0.035;
  z-index:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- Nav ---------- */
.nav{
  position:sticky;
  top:0;
  z-index:10;
  background-color:rgba(246,242,233,0.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.nav-inner{
  max-width:920px;
  margin:0 auto;
  padding:18px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.nav-mark{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:1.15rem;
}

.nav-tag{
  font-size:0.82rem;
  color:var(--ink-soft);
}

/* ---------- Hero ---------- */
.hero{
  max-width:760px;
  margin:0 auto;
  padding:72px 24px 40px;
  text-align:center;
  position:relative;
  z-index:1;
}

.eyebrow{
  font-size:0.78rem;
  font-weight:600;
  letter-spacing:0.16em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:18px;
}

.headline{
  font-family:'Fraunces', serif;
  font-optical-sizing:auto;
  font-size:clamp(2.4rem, 5vw, 3.6rem);
  font-weight:600;
  line-height:1.08;
  letter-spacing:-1px;
  margin:0 0 22px;
}

.headline em{
  font-style:italic;
  color:var(--accent);
}

.subhead{
  font-size:1.08rem;
  color:var(--ink-soft);
  line-height:1.6;
  max-width:540px;
  margin:0 auto;
}

/* ---------- Demo card ---------- */
.demo-section{
  max-width:680px;
  margin:0 auto;
  padding:0 24px 80px;
  position:relative;
  z-index:1;
}

.demo-card{
  background-color:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:32px;
  box-shadow:0 20px 50px -20px rgba(42,36,28,0.15);
}

.field-label{
  display:block;
  font-size:0.78rem;
  font-weight:600;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--ink-soft);
  margin-bottom:10px;
}

textarea{
  width:100%;
  min-height:170px;
  resize:vertical;
  background-color:var(--cream);
  border:1px solid var(--line);
  border-radius:10px;
  padding:16px;
  font-family:'Inter', sans-serif;
  font-size:0.98rem;
  color:var(--ink);
  outline:none;
  transition:border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px rgba(181,80,47,0.12);
}

textarea::placeholder{ color:#A69C87; }

.demo-actions{
  display:flex;
  gap:12px;
  margin-top:18px;
}

.btn-primary, .btn-ghost{
  font-family:'Inter', sans-serif;
  font-weight:600;
  font-size:0.95rem;
  border-radius:9px;
  padding:0.75rem 1.5rem;
  cursor:pointer;
  border:1px solid transparent;
  transition:all 0.15s ease;
}

.btn-primary{
  background-color:var(--accent);
  color:#fff;
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
}

.btn-primary:hover{ background-color:var(--accent-dark); }
.btn-primary:disabled{ opacity:0.65; cursor:not-allowed; }

.btn-ghost{
  background:transparent;
  color:var(--ink-soft);
  border-color:var(--line);
}

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

.btn-spinner{
  width:15px;
  height:15px;
  border:2px solid rgba(255,255,255,0.4);
  border-top-color:#fff;
  border-radius:50%;
  animation:spin 0.7s linear infinite;
}

@keyframes spin{ to{ transform:rotate(360deg); } }

.api-hint{
  font-size:0.8rem;
  color:var(--ink-soft);
  margin:14px 2px 0;
}

/* ---------- Result ---------- */
.result{
  margin-top:28px;
  padding-top:24px;
  border-top:1px dashed var(--line);
  position:relative;
  animation:reveal 0.4s ease;
}

@keyframes reveal{
  from{ opacity:0; transform:translateY(6px); }
  to{ opacity:1; transform:translateY(0); }
}

.stamp-wrap{
  position:absolute;
  top:14px;
  right:8px;
  z-index:2;
}

.stamp{
  font-family:'JetBrains Mono', monospace;
  font-weight:700;
  font-size:0.72rem;
  letter-spacing:0.12em;
  padding:8px 14px;
  border:2.5px solid currentColor;
  border-radius:6px;
  transform:rotate(-8deg);
  text-transform:uppercase;
  opacity:0.9;
}

.stamp.real{ color:var(--real); }
.stamp.fake{ color:var(--fake); }

.verdict-row{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:20px;
  padding-right:110px;
}

.verdict-label{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:1.5rem;
}

#result.is-real .verdict-label{ color:var(--real); }
#result.is-fake .verdict-label{ color:var(--fake); }

.verdict-sub{
  font-size:0.9rem;
  color:var(--ink-soft);
  margin-top:4px;
  max-width:340px;
}

.confidence-num{
  font-family:'JetBrains Mono', monospace;
  font-weight:700;
  font-size:1.9rem;
  white-space:nowrap;
}

#result.is-real .confidence-num{ color:var(--real); }
#result.is-fake .confidence-num{ color:var(--fake); }

.bar-track{
  height:8px;
  border-radius:6px;
  background-color:var(--cream-deep);
  margin-top:20px;
  overflow:hidden;
}

.bar-fill{
  height:100%;
  width:0%;
  border-radius:6px;
  background-color:var(--accent);
  transition:width 0.6s ease;
}

#result.is-real .bar-fill{ background-color:var(--real); }
#result.is-fake .bar-fill{ background-color:var(--fake); }

.stat-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
  margin-top:20px;
}

.stat-box{
  background-color:var(--cream);
  border:1px solid var(--line);
  border-radius:10px;
  padding:16px;
  text-align:center;
}

.stat-label{
  font-size:0.72rem;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--ink-soft);
  font-weight:600;
  margin-bottom:6px;
}

.stat-value{
  font-family:'JetBrains Mono', monospace;
  font-weight:700;
  font-size:1.3rem;
}

/* ---------- How it works ---------- */
.how{
  max-width:920px;
  margin:0 auto;
  padding:20px 24px 80px;
  position:relative;
  z-index:1;
}

.section-title{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:1.8rem;
  text-align:center;
  margin-bottom:44px;
}

.steps{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:32px;
}

.step-num{
  font-family:'JetBrains Mono', monospace;
  font-weight:700;
  color:var(--accent);
  font-size:0.85rem;
}

.step h3{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:1.15rem;
  margin:10px 0 8px;
}

.step p{
  font-size:0.92rem;
  color:var(--ink-soft);
  line-height:1.55;
  margin:0;
}

/* ---------- Stats strip ---------- */
.stats-strip{
  background-color:var(--ink);
  color:var(--cream);
  padding:44px 24px;
  display:flex;
  justify-content:center;
  gap:72px;
  flex-wrap:wrap;
}

.strip-num{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size:2.1rem;
  text-align:center;
}

.strip-label{
  font-size:0.8rem;
  letter-spacing:0.05em;
  text-transform:uppercase;
  color:#B9AF98;
  text-align:center;
  margin-top:4px;
}

/* ---------- Footer ---------- */
.site-footer{
  text-align:center;
  padding:32px 24px 48px;
  font-size:0.85rem;
  color:var(--ink-soft);
  position:relative;
  z-index:1;
}

/* ---------- Responsive ---------- */
@media (max-width:700px){
  .steps{ grid-template-columns:1fr; }
  .verdict-row{ padding-right:0; flex-direction:column; gap:10px; }
  .stamp-wrap{ position:static; margin-bottom:12px; }
  .stats-strip{ gap:36px; }
  .demo-card{ padding:22px; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; }
}