/* ============================================================
   NICE – Panel Navigation
   Overlay drawers that slide in from the right.
   ============================================================ */

/* ── Backdrop (left strip — blur layer + click-to-close) ─── */
.panel-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-panel);           /* 10 — below panels, above canvas */
  background: transparent;
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity        0.4s cubic-bezier(0.76, 0, 0.24, 1),
    backdrop-filter 0.4s cubic-bezier(0.76, 0, 0.24, 1);
}

.panel-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ── Panel drawer ─────────────────────────────────────────── */
/* Mobile first: slides down from top, full width */
.panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100dvh;
  z-index: var(--z-overlay);        /* 20 — above backdrop */
  background: var(--color-dark);
  border-bottom: 1px solid rgba(182, 161, 205, 0.15);
  transform: translateY(-100%);
  transition: transform 0.4s cubic-bezier(0.76, 0, 0.24, 1);
  overflow: hidden;                  /* inner content scrolls, not panel */
  display: flex;
  flex-direction: column;
}

.panel.is-open {
  transform: translateY(0);
}

/* Desktop: slides in from right, inset width */
@media (min-width: 769px) {
  .panel {
    top: 0;
    left: auto;
    right: 0;
    width: 78vw;
    max-width: 900px;
    height: 100dvh;
    border-bottom: none;
    border-left: 1px solid rgba(182, 161, 205, 0.15);
    transform: translateX(100%);
  }

  .panel.is-open {
    transform: translateX(0);
  }
}

/* ── Panel header row (title + close) ─────────────────────── */
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid rgba(182, 161, 205, 0.1);
  flex-shrink: 0;
}

@media (min-width: 769px) {
  .panel-header {
    padding: var(--space-6) var(--space-8);
  }
}

/* ── Panel title ───────────────────────────────────────────── */
.panel-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-lavender);
  opacity: 0.4;
}

/* ── Panel close button ────────────────────────────────────── */
.panel-close {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-lavender);
  opacity: 0.4;
  /* min 44×44px touch target */
  min-width: 44px;
  min-height: 44px;
  padding: 0 var(--space-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: opacity var(--duration-fast) var(--ease-out-expo),
              color    var(--duration-fast) var(--ease-out-expo);
}

.panel-close:hover {
  opacity: 1;
  color: var(--color-yellow);
}

.panel-close:focus-visible {
  opacity: 1;
  color: var(--color-yellow);
  outline: none;
}

/* ── Panel scrollable content area ────────────────────────── */
.panel-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;  /* smooth momentum scroll on iOS */
  padding: var(--space-8) var(--space-6) var(--space-12);
  scrollbar-width: thin;
  scrollbar-color: rgba(182, 161, 205, 0.25) transparent;
}

@media (min-width: 769px) {
  .panel-content {
    padding: var(--space-8) var(--space-8) var(--space-12);
  }
}

.panel-content::-webkit-scrollbar {
  width: 4px;
}

.panel-content::-webkit-scrollbar-track {
  background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
  background: rgba(182, 161, 205, 0.25);
  border-radius: var(--radius-pill);
}