* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0f;
  --surface: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e0e0e6;
  --text-dim: #8888a0;
  --real: #00e09e;
  --uncertain: #f0a030;
  --synthetic: #ff4060;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  max-width: 560px;
  margin: 0 auto;
  padding: 60px 20px 40px;
  width: 100%;
}

h1 {
  font-size: 2.4rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  text-align: center;
  margin-bottom: 4px;
}

.subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.limit {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.75rem;
  margin-bottom: 40px;
}

#verdict-box.error #verdict-label,
#verdict-box.too_small #verdict-label { color: var(--text-dim); font-size: 0.9rem; text-transform: none; }

#dropzone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 60px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--surface);
}

#dropzone:hover, #dropzone.dragover {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.06);
}

#drop-text { color: var(--text-dim); font-size: 0.9rem; }

#preview {
  max-width: 100%;
  max-height: 300px;
  border-radius: 8px;
  object-fit: contain;
}

#result {
  margin-top: 32px;
}

#verdict-box {
  text-align: center;
  padding: 20px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

#verdict-label {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

#verdict-box.not_ai { border-color: var(--real); }
#verdict-box.not_ai #verdict-label { color: var(--real); }
#verdict-box.uncertain { border-color: var(--uncertain); }
#verdict-box.uncertain #verdict-label { color: var(--uncertain); }
#verdict-box.ai_generated { border-color: var(--synthetic); }
#verdict-box.ai_generated #verdict-label { color: var(--synthetic); }

#confidence {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 8px;
}

#loading {
  text-align: center;
  margin-top: 40px;
}

#loading p { color: var(--text-dim); margin-top: 16px; font-size: 0.9rem; }

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  margin: 0 auto;
  animation: spin 0.8s linear infinite;
}

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

footer {
  text-align: center;
  padding: 20px;
  color: var(--text-dim);
  font-size: 0.75rem;
}

@media (max-width: 480px) {
  main { padding: 40px 16px 20px; }
  h1 { font-size: 1.8rem; }
}