/* ─────────────────────────────────────────
   panel.css — Right control panel shell
───────────────────────────────────────── */

.control-panel {
  flex: 0 0 var(--panel-width);
  width: var(--panel-width);
  height: 100vh;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}

/* ── Panel header (logo bar) ── */
.panel-header {
  flex-shrink: 0;
  height: var(--panel-header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-lg);
  border-bottom: 1px solid var(--border);
}

.panel-logo {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: lowercase;
}

.panel-version {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
}

/* ── Scrollable body ── */
.panel-scroll {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.panel-scroll::-webkit-scrollbar {
  width: 3px;
}
.panel-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.panel-scroll::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: var(--r-full);
}

/* ── Sections ── */
.panel-section {
  border-bottom: 1px solid var(--border);
}

.section-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-md) var(--sp-lg);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color var(--t-fast);
}

.section-header:hover {
  color: var(--text-primary);
}

.section-header .chevron {
  transition: transform var(--t-med);
  flex-shrink: 0;
}

/* Collapsed state */
.panel-section.collapsed .chevron {
  transform: rotate(180deg);
}

.panel-section.collapsed .section-body {
  display: none;
}

/* Section body */
.section-body {
  padding: 2px var(--sp-lg) var(--sp-lg);
  display: flex;
  flex-direction: column;
  gap: var(--sp-md);
}

/* Download section accent */
.download-section .section-header {
  color: var(--accent);
}
.download-section .section-header:hover {
  color: var(--accent);
}