/* ── SoT Flow Visualizer — Premium Dark Theme ── */

:root {
  --bg-deep:     #0a0e1a;
  --bg-surface:  #111827;
  --bg-card:     #1a2035;
  --bg-hover:    #1e2845;
  --bg-active:   #252f4a;
  --accent:      #818cf8;
  --accent-glow: rgba(129, 140, 248, 0.25);
  --accent-dim:  #6366f1;
  --text:        #f1f5f9;
  --text-dim:    #94a3b8;
  --text-muted:  #64748b;
  --border:      rgba(255, 255, 255, 0.06);
  --border-light:rgba(255, 255, 255, 0.1);
  --success:     #34d399;
  --warning:     #fbbf24;
  --danger:      #f87171;
  --radius:      12px;
  --radius-sm:   8px;
  --sidebar-w:   280px;
  --transition:  0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  height: 100%;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  overflow: hidden;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* ── Layout ── */
body {
  display: flex;
}

/* ═══════════════════════════════════════════════
   SIDEBAR
   ═══════════════════════════════════════════════ */

.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 10;
}

.sidebar::after {
  content: '';
  position: absolute;
  right: -1px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-dim), transparent);
  opacity: 0.3;
}

.sidebar-header {
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 1.6rem;
  color: var(--accent);
  filter: drop-shadow(0 0 8px var(--accent-glow));
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { filter: drop-shadow(0 0 8px var(--accent-glow)); }
  50% { filter: drop-shadow(0 0 16px var(--accent-glow)); }
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.logo-accent {
  color: var(--accent);
  animation: blink 1.2s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.logo-sub {
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar-section {
  flex: 1;
  overflow-y: auto;
  padding: 16px 12px;
}

.sidebar-title {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0 12px;
  margin-bottom: 8px;
}

.flow-list {
  list-style: none;
}

.flow-list li {
  position: relative;
}

.flow-list li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

.flow-list li a::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  opacity: 0.4;
  transition: var(--transition);
  flex-shrink: 0;
}

.flow-list li a:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.flow-list li a:hover::before {
  background: var(--accent);
  opacity: 0.8;
  box-shadow: 0 0 8px var(--accent-glow);
}

.flow-list li a.active {
  background: var(--bg-active);
  color: var(--text);
}

.flow-list li a.active::before {
  background: var(--accent);
  opacity: 1;
  box-shadow: 0 0 12px var(--accent-glow);
}

.flow-node-count {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 2px 7px;
  border-radius: 10px;
  font-family: 'JetBrains Mono', monospace;
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

.stats {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ═══════════════════════════════════════════════
   MAIN CONTENT
   ═══════════════════════════════════════════════ */

.main {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* ── Welcome / Empty State ── */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
  padding: 40px;
  animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.welcome-icon {
  font-size: 5rem;
  margin-bottom: 24px;
  color: var(--accent);
  filter: drop-shadow(0 0 30px var(--accent-glow));
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}

.welcome h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome p {
  font-size: 1rem;
  color: var(--text-dim);
  max-width: 420px;
}

.welcome code {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
  color: var(--accent);
}

/* ── Flow View ── */
.flow-view {
  display: flex;
  flex-direction: column;
  flex: 1;
  animation: fadeInUp 0.4s ease;
}

.hidden { display: none !important; }

/* ── Flow Header ── */
.flow-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.flow-header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.flow-badge {
  background: linear-gradient(135deg, var(--accent-dim), var(--accent));
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 6px;
}

.flow-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.flow-header-right {
  display: flex;
  gap: 20px;
}

.flow-stat {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.flow-stat .stat-num {
  color: var(--accent);
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

/* ── Flow Tabs ── */
.flow-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-deep);
  padding: 0 32px;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 12px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 2px solid transparent;
}

.tab-btn:hover {
  color: var(--text);
  background: var(--bg-surface);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: var(--bg-surface);
}

/* ── Tab Content ── */
.tab-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* ── Source View ── */
.source-container {
  flex: 1;
  background: var(--bg-deep);
  overflow: auto;
  padding: 32px;
}

.source-code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-dim);
  white-space: pre;
}

/* ── Syntax Highlighting ── */
.flow-comment { color: #6a9955; font-style: italic; }
.flow-keyword { color: #569cd6; font-weight: bold; }
.flow-operator { color: #d4d4d4; }
.flow-modifier { color: #c586c0; }
.flow-block-marker { color: #dcdcaa; font-weight: bold; border-bottom: 1px solid rgba(220, 218, 170, 0.2); }
.flow-method-sig { color: #4ec9b0; }
.flow-punctuation { color: #808080; }
.flow-string { color: #ce9178; }
.flow-number { color: #b5cea8; }

/* ── Diagram ── */
.diagram-container {
  flex: 1;
  overflow: auto;
  padding: 32px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 300px;
}

.diagram {
  width: 100%;
  display: flex;
  justify-content: center;
}

.diagram svg {
  max-width: 100%;
  height: auto;
}

/* Mermaid node overrides */
.diagram .node rect,
.diagram .node polygon {
  rx: 8;
  ry: 8;
}

/* ── Detail Panels ── */
.details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  padding: 24px 32px 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-deep);
  flex-shrink: 0;
}

.detail-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}

.detail-panel:hover {
  border-color: var(--accent-dim);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

.detail-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.detail-icon {
  color: var(--accent);
  font-size: 0.9rem;
}

.detail-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ── Detail Items ── */
.detail-item {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  transition: var(--transition);
}

.detail-item:hover {
  border-color: var(--border-light);
  background: var(--bg-hover);
}

.detail-item-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 4px;
}

.detail-item-fields {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.6;
}

.detail-item-signature {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
}

.detail-item-badge {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 8px;
  vertical-align: middle;
}

.badge-has-code {
  background: rgba(52, 211, 153, 0.15);
  color: var(--success);
}

.badge-extern {
  background: rgba(251, 191, 36, 0.15);
  color: var(--warning);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { width: 220px; min-width: 220px; }
  .flow-header { flex-direction: column; gap: 12px; align-items: flex-start; }
  .details { grid-template-columns: 1fr; }
}