/* Menu UI styling and layout.
   Keep menu visuals isolated from effects for easier re-theming. */
/* Hidden checkbox drives the panel open/close state without JS. */
.side-toggle-input {
  position: fixed;
  left: 0;
  top: 0;
  opacity: 0;
  pointer-events: none;
}
/* Side handle to open the sliding customization panel. */
.side-toggle {
  position: fixed;
  left: 0;
  top: 20%;
  transform: translateY(-20%);
  z-index: 7;
  border: 1px solid rgba(var(--green-rgb), 0.35);
  border-left: none;
  background: rgba(5, 10, 8, 0.65);
  color: var(--green);
  font-family: "Courier New", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 10px 12px;
  text-transform: uppercase;
  cursor: pointer;
  backdrop-filter: blur(6px);
}

/* Left-side sliding panel container (content comes later). */
.side-panel {
  position: fixed;
  left: 0;
  top: 20%;
  transform: translate(-100%, -20%);
  width: min(320px, 80vw);
  height: min(360px, 70vh);
  background: rgba(2, 8, 6, 0.88);
  border: 1px solid rgba(var(--green-rgb), 0.2);
  border-left: none;
  transition: transform 0.3s ease;
  z-index: 8;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

/* Shift the panel into view when toggled. */
#menu-toggle:checked ~ .side-panel {
  transform: translate(0, -20%);
}

/* Header row inside the panel for the close control. */
.side-panel-header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(var(--green-rgb), 0.1);
}

/* Placeholder layout for future customization controls. */
/* Scrollable body so expanded sections don't push options off-screen. */
.side-panel-body {
  padding: 14px 16px;
  display: grid;
  gap: 12px;
  color: rgba(230, 255, 240, 0.9);
  font-family: "Courier New", monospace;
  font-size: 12px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

/* Expandable section for grouping color controls. */
/* Theme section container uses a softer fill for contrast. */
.side-panel-section {
  border: 1px solid rgba(var(--green-rgb), 0.15);
  background: var(--green-soft-weak);
}

.side-panel-section-toggle {
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border: none;
  background: transparent;
  color: var(--green);
  font-family: inherit;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

.side-panel-section-body {
  padding: 10px;
  display: none;
  gap: 8px;
  color: rgba(230, 255, 240, 0.75);
}

.side-panel-section.is-open .side-panel-section-body {
  display: grid;
}

/* Inline theme color wheel (no native popup). */
.theme-picker {
  display: grid;
  gap: 10px;
}

.theme-wheel {
  position: relative;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  margin: 0 auto;
  background: radial-gradient(
      circle at center,
      #ffffff 0%,
      rgba(255, 255, 255, 0) 65%
    ),
    conic-gradient(
      #ff004c,
      #ff8a00,
      #ffe600,
      #7bff00,
      #00ffb3,
      #00b6ff,
      #5b5bff,
      #c100ff,
      #ff004c
    );
  cursor: crosshair;
}

.theme-wheel-indicator {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid #ffffff;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.6);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.theme-picker-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.theme-picker-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(230, 255, 240, 0.7);
}

.theme-swatch {
  width: 36px;
  height: 18px;
  border: 1px solid rgba(var(--green-rgb), 0.25);
  background: #00ff7a;
}

/* Field block for text-based settings. */
.side-panel-field {
  display: grid;
  gap: 6px;
}

.side-panel-field input[type="text"] {
  width: 100%;
  padding: 8px 10px;
  background: rgba(5, 10, 8, 0.85);
  border: 1px solid rgba(var(--green-rgb), 0.25);
  color: rgba(230, 255, 240, 0.95);
  font-family: inherit;
  font-size: 12px;
}

/* Toggle rows for future feature flags. */
.side-panel-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

/* Two-column layout keeps toggle options compact. */
.toggle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 14px;
}

/* Toggle buttons use theme-tinted fills for legibility. */
.toggle-button {
  border: 1px solid rgba(var(--green-rgb), 0.35);
  background: var(--green-soft-weak);
  color: var(--green);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  text-transform: uppercase;
  cursor: pointer;
}

.toggle-button[aria-pressed="false"] {
  opacity: 0.55;
}

/* Close button keeps the theme fill while staying subtle. */
.side-panel-close {
  border: 1px solid rgba(var(--green-rgb), 0.35);
  background: var(--green-soft-weak);
  color: var(--green);
  font-family: "Courier New", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 6px 10px;
  cursor: pointer;
}

/* Apply button gets a stronger theme fill to stand out. */
.side-panel-apply {
  border: 1px solid rgba(var(--green-rgb), 0.35);
  background: var(--green-soft-strong);
  color: var(--green);
  font-family: "Courier New", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 6px 10px;
  cursor: pointer;
}