/* ---------- Layout ---------- */
:root {
  --ip-bg: #f9fafb;
  --ip-fg: #1f2937;
  --ip-muted: #6b7280;
  --ip-accent: #2563eb;
  --ip-accent-soft: #dbeafe;
  --ip-border: #e5e7eb;
  --ip-card: #ffffff;
  --ip-error: #dc2626;
  --ip-success: #047857;
  --ip-warn-bg: #fef3c7;
  --ip-warn-fg: #92400e;
  --ip-radius: 10px;
}

html, body {
  background: var(--ip-bg);
  color: var(--ip-fg);
  font-family: "Google Sans", "Source Sans Pro", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.section {
  padding: 2.5rem 1.5rem;
}

.hero-body {
  padding-bottom: 1.5rem;
}

.teaser-video-section {
  padding-top: 0;
  padding-bottom: 2rem;
  background: var(--ip-bg);
}

.teaser-video {
  display: block;
  width: 100%;
  max-height: 72vh;
  background: #111827;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.publication-title {
  font-weight: 700;
  letter-spacing: -0.01em;
}

.publication-authors {
  color: var(--ip-muted);
  font-size: 1.05rem;
}

.publication-links a.button {
  border-radius: 999px;
  padding-left: 1.1rem;
  padding-right: 1.1rem;
}

.anon-banner {
  background: var(--ip-warn-bg);
  color: var(--ip-warn-fg);
  border-radius: 8px;
  padding: 0.6rem 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  margin-top: 1rem;
}

.section.abstract {
  background: var(--ip-card);
  border-top: 1px solid var(--ip-border);
  border-bottom: 1px solid var(--ip-border);
}

.abstract-body {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ip-fg);
}

.abstract-body p + p {
  margin-top: 0.9rem;
}

/* ---------- Demo ---------- */
.demo-card {
  background: var(--ip-card);
  border: 1px solid var(--ip-border);
  border-radius: var(--ip-radius);
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.demo-field { margin-bottom: 1.25rem; }
.demo-field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.demo-hint {
  color: var(--ip-muted);
  font-size: 0.9rem;
  margin-top: 0.35rem;
}

.demo-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.file-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  background: var(--ip-accent);
  color: white;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.95rem;
}
.file-pill input { display: none; }

.example-select {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--ip-border);
  border-radius: 8px;
  background: white;
  font-size: 0.95rem;
  min-width: 220px;
  max-width: 100%;
}

.thumbs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  min-height: 90px;
  align-items: center;
  padding: 0.5rem;
  border: 1px dashed var(--ip-border);
  border-radius: 8px;
  background: #fafbfc;
}
.thumbs-empty {
  color: var(--ip-muted);
  font-size: 0.9rem;
  width: 100%;
  text-align: center;
}
.thumb {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid transparent;
  background: white;
  cursor: pointer;
  padding: 0;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb.start { border-color: var(--ip-accent); }
.thumb-badge {
  position: absolute;
  top: 2px; right: 4px;
  color: gold;
  text-shadow: 0 0 3px rgba(0, 0, 0, 0.6);
  font-size: 1.1rem;
}

.start-image-wrap {
  position: relative;
  display: inline-block;
  max-width: 100%;
}
#start-canvas {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--ip-border);
  cursor: crosshair;
  background: #f3f4f6;
}

.point-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.point-text {
  color: var(--ip-muted);
  font-size: 0.9rem;
}
.btn-link {
  background: none;
  border: none;
  color: var(--ip-accent);
  cursor: pointer;
  padding: 0;
  font-size: 0.9rem;
  text-decoration: underline;
}

textarea.demo-input {
  width: 100%;
  border: 1px solid var(--ip-border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  font: inherit;
  resize: vertical;
}

.btn-primary {
  background: var(--ip-accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.4rem;
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
}
.btn-primary[disabled] {
  background: #93c5fd;
  cursor: not-allowed;
}

.demo-status {
  margin-top: 1rem;
  padding: 0.7rem 0.9rem;
  border-radius: 8px;
  background: var(--ip-accent-soft);
  color: #1e3a8a;
  font-size: 0.95rem;
}
.demo-status.error { background: #fee2e2; color: var(--ip-error); }
.demo-status.success { background: #d1fae5; color: var(--ip-success); }
.demo-status[hidden] { display: none; }

.viewer-panel { margin-top: 1.5rem; }
.viewer-panel[hidden] { display: none; }
.viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.viewer-frame-wrap {
  position: relative;
  width: 100%;
  border: 1px solid var(--ip-border);
  border-radius: 8px;
  overflow: hidden;
  background: #111;
}
.viewer-frame-wrap iframe {
  display: block;
  width: 100%;
  height: 600px;
  border: 0;
}

.notes ul { list-style: disc inside; color: var(--ip-muted); }
.notes li { margin: 0.25rem 0; font-size: 0.95rem; }

footer.footer {
  background: transparent;
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--ip-muted);
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .viewer-frame-wrap iframe { height: 420px; }
}