:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --red: #e53e3e;
  --red-soft: #fc8181;
  --green: #48bb78;
  --yellow: #ecc94b;
  --blue: #63b3ed;
  --purple: #b794f4;
  --radius: 12px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* HEADER */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.header-tag {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
}

/* MAIN */
main {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  padding: 40px 24px;
}

.hero {
  text-align: center;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff 0%, #8b949e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* UPLOAD */
.upload-card {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 60px 40px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--surface);
}

.upload-card:hover, .upload-card.dragover {
  border-color: var(--red);
  background: rgba(229, 62, 62, 0.05);
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.upload-label {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.upload-sub {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.upload-hint {
  color: var(--text-muted);
  font-size: 12px;
}

.link-btn {
  background: none;
  border: none;
  color: var(--red-soft);
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
  text-decoration: underline;
}

/* RESULTS */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 24px;
  margin-bottom: 24px;
}

@media (max-width: 768px) {
  .results-grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.card h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* DIAGNOSIS */
.diagnosis-badge {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.confidence-main {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.class-bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.class-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.class-row-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}

.class-name { color: var(--text-muted); }
.class-pct { font-weight: 600; }

.bar-track {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.6s ease;
}

.bar-fill.top { background: var(--red); }
.bar-fill.other { background: var(--blue); }

.disclaimer {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 28px;
  padding: 12px;
  background: var(--surface2);
  border-radius: 8px;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.disclaimer svg { flex-shrink: 0; margin-top: 1px; }

/* IMAGE TABS */
.image-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--surface2);
  border-radius: 8px;
  padding: 4px;
}

.tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.2s;
}

.tab.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
}

.image-panel img {
  width: 100%;
  border-radius: 8px;
  display: block;
  border: 1px solid var(--border);
}

.gradcam-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 10px;
  text-align: center;
}

/* ACTIONS */
.actions {
  display: flex;
  justify-content: center;
}

.btn-secondary {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 24px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--red);
  color: var(--red-soft);
}

/* LOADING */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 17, 23, 0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--red);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
  color: var(--text-muted);
  font-size: 14px;
}

/* FOOTER */
footer {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}