/* Thermalize Internal Hub — internal use only */
:root {
  --bg: #0f1419;
  --bg-card: #1a2332;
  --bg-sidebar: #0a0e12;
  --text: #e6edf3;
  --text-muted: #8b9cad;
  --accent: #2dd4bf;
  --accent-dim: #0d9488;
  --warm: #f59e0b;
  --border: #2d3a4a;
  --radius: 10px;
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.banner {
  background: linear-gradient(90deg, var(--accent-dim) 0%, #0f766e 100%);
  color: #fff;
  text-align: center;
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.banner-dot {
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.site-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}

.logo-block {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
}

.logo-tagline {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
}

.header-subtitle {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.app {
  display: flex;
  min-height: calc(100vh - 120px);
}

.sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 1rem 0;
  overflow-y: auto;
}

.sidebar-section {
  margin-bottom: 0.5rem;
}

.sidebar-section-btn {
  width: 100%;
  padding: 0.65rem 1.25rem;
  border: none;
  background: transparent;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.15s, color 0.15s;
}

.sidebar-section-btn:hover {
  background: var(--border);
  color: var(--accent);
}

.sidebar-section-btn.active {
  background: rgba(45, 212, 191, 0.12);
  color: var(--accent);
  border-left: 3px solid var(--accent);
  padding-left: calc(1.25rem - 3px);
}

.main {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
  max-width: 960px;
  margin: 0 auto;
}

.main.wide {
  max-width: 100%;
}

.welcome h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.welcome p {
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.welcome code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-card);
  padding: 0.2em 0.5em;
  border-radius: 4px;
  color: var(--accent);
}

.welcome .text-muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.hidden {
  display: none !important;
}

.section-content h2 {
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.cards {
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.card:hover {
  border-color: var(--accent-dim);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.card h3 {
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
}

.card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--accent);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.card-btn:hover {
  background: var(--accent-dim);
  color: #fff;
  border-color: var(--accent-dim);
}

.card-btn.primary {
  background: var(--accent-dim);
  color: #fff;
  border-color: var(--accent-dim);
}

.card-btn.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.diagram-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.diagram-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.diagram-card:hover {
  border-color: var(--accent-dim);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.diagram-card img {
  width: 100%;
  height: auto;
  display: block;
  cursor: pointer;
  background: #0d1117;
}

.diagram-card figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.file-thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1.25rem;
}

.file-thumbnail-card {
  margin: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.file-thumbnail-card:hover {
  border-color: var(--accent-dim);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.file-thumbnail-card:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.file-thumbnail-preview {
  aspect-ratio: 3 / 4;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(145deg, #1a2332 0%, #0d1117 100%);
  overflow: hidden;
  position: relative;
}

.file-thumbnail-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.file-thumbnail-loading {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.file-thumbnail-canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.file-thumbnail-card figcaption {
  padding: 0.65rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--text);
  text-align: center;
}

.btn-back {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 1rem;
  transition: color 0.15s, border-color 0.15s;
}

.btn-back:hover {
  color: var(--accent);
  border-color: var(--accent-dim);
}

.doc-toolbar,
.diagram-toolbar {
  margin-bottom: 1.5rem;
}

.doc-title,
.diagram-title {
  font-size: 1.25rem;
  margin: 0.5rem 0 0;
}

.doc-body {
  padding: 0.5rem 0;
}

/* Markdown body */
.markdown-body {
  font-size: 0.95rem;
}

.markdown-body h1 { font-size: 1.6rem; margin-top: 1.5rem; margin-bottom: 0.75rem; }
.markdown-body h2 { font-size: 1.3rem; margin-top: 1.35rem; margin-bottom: 0.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.25rem; }
.markdown-body h3 { font-size: 1.1rem; margin-top: 1.1rem; margin-bottom: 0.4rem; }
.markdown-body p { margin-bottom: 0.85rem; }
.markdown-body ul, .markdown-body ol { margin-bottom: 0.85rem; padding-left: 1.5rem; }
.markdown-body li { margin-bottom: 0.25rem; }
.markdown-body code { font-family: var(--font-mono); font-size: 0.88em; background: var(--bg-sidebar); padding: 0.15em 0.4em; border-radius: 4px; color: var(--accent); }
.markdown-body pre { background: var(--bg-sidebar); padding: 1rem; border-radius: var(--radius); overflow-x: auto; margin-bottom: 1rem; border: 1px solid var(--border); }
.markdown-body pre code { background: none; padding: 0; color: var(--text); }
.markdown-body table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; font-size: 0.9rem; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 0.5rem 0.75rem; text-align: left; }
.markdown-body th { background: var(--bg-sidebar); font-weight: 600; color: var(--accent); }
.markdown-body blockquote { border-left: 4px solid var(--accent-dim); margin: 1rem 0; padding-left: 1rem; color: var(--text-muted); }
.markdown-body a { color: var(--accent); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }

.diagram-frame {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}

.diagram-frame img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

/* Interactive iframe view */
.interactive-toolbar {
  margin-bottom: 1rem;
}

.interactive-title {
  font-size: 1.25rem;
  margin: 0.5rem 0 0;
}

.interactive-frame {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.interactive-frame iframe {
  width: 100%;
  height: calc(100vh - 260px);
  min-height: 600px;
  border: none;
  display: block;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2rem;
}

.modal img {
  max-width: 95vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-card);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
  transition: background 0.15s, color 0.15s;
}

.modal-close:hover {
  background: var(--accent);
  color: var(--bg);
}

.loading {
  color: var(--text-muted);
  font-style: italic;
}

.error {
  color: #f87171;
  padding: 1rem;
  background: rgba(248, 113, 113, 0.1);
  border-radius: var(--radius);
  border: 1px solid rgba(248, 113, 113, 0.3);
}