/* ui/panel.css */

/* =========
   Tokens
   ========= */
:root {
  --panel-w: 320px;
  --panel-r: 6px;
  --panel-pad: 14px;

  --panel-bg: rgba(255, 255, 255, 0.92);
  --panel-text: #111;
  --panel-subtle: rgba(0, 0, 0, 0.55);
  --panel-line: rgba(0, 0, 0, 0.1);

  --shadow-lg: 0 16px 60px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.1);

  --accent: #2f6bff;
  --focus: 0 0 0 3px color-mix(in oklab, var(--accent) 30%, transparent);

  --control-h: 36px;
  --control-r: 14px;
  --control-bg: rgba(0, 0, 0, 0.04);
  --control-bg-hover: rgba(0, 0, 0, 0.065);

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --panel-bg: rgba(18, 18, 18, 0.88);
    --panel-text: #f2f2f2;
    --panel-subtle: rgba(255, 255, 255, 0.65);
    --panel-line: rgba(255, 255, 255, 0.1);

    --shadow-lg: 0 16px 60px rgba(0, 0, 0, 0.55);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.45);

    --control-bg: rgba(255, 255, 255, 0.07);
    --control-bg-hover: rgba(255, 255, 255, 0.1);
  }
}

/* =========
     Panel
     ========= */
.panel {
  inline-size: min(100%, var(--panel-w));
  background: var(--panel-bg);
  color: var(--panel-text);
  border-radius: var(--panel-r);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--panel-line);
  overflow: clip;
  backdrop-filter: blur(10px);
}

.panel__header {
  margin: 0;
  padding: var(--panel-pad);
}

.panel__title {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.panel__section {
  padding: var(--panel-pad);
  border-top: 1px solid var(--panel-line);
  display: grid;
  gap: 10px;
}

.panel__section:first-child {
  border-top: none;
}

.panel__sectionHead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.panel__sectionTitle {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

.panel__footer {
  border-top: 1px solid var(--panel-line);
  padding: 12px var(--panel-pad);
  inset-block-end: 0;
  background: linear-gradient(
    to bottom,
    color-mix(in oklab, var(--panel-bg) 65%, transparent),
    var(--panel-bg)
  );
  display: grid;
  gap: 12px;
  margin-top: 0;
}

/* =========
     Fields
     ========= */
.field {
  display: grid;
  gap: 4px;
}

.field__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.field__label {
  font-weight: 550;
  letter-spacing: -0.01em;
}

.field__meta {
  color: var(--panel-subtle);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  font-size: 0.92rem;
}

/* Controls */
.field__control {
  inline-size: 100%;
  min-block-size: var(--control-h);
  border-radius: var(--control-r);
  border: 1px solid transparent;
  background: var(--control-bg);
  color: inherit;
  padding: 8px 12px;
  transition:
    background 0.15s ease,
    border-color 0.15s ease;
}

.field__control:hover {
  background: var(--control-bg-hover);
}

.field__control:focus-visible {
  outline: none;
  box-shadow: var(--focus);
  border-color: color-mix(in oklab, var(--accent) 35%, transparent);
}

/* Dropdown affordance: “discoverable on hover” */
.field--select {
  position: relative;
}

.field--select::after {
  content: "";
  position: absolute;
  inset-inline-end: 12px;
  inset-block-start: calc(50% + 8px);
  translate: 0 -50%;
  inline-size: 10px;
  block-size: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  rotate: 45deg;
  opacity: 0.25;
  pointer-events: none;
  transition:
    opacity 0.15s ease,
    transform 0.15s ease;
}

.field--select:hover::after,
.field--select:has(select:focus-visible)::after {
  opacity: 0.7;
  transform: translateY(1px);
}

.field--select select {
  appearance: none;
  padding-inline-end: 36px;
}

/* =========
     Minimal range
     ========= */
.range {
  inline-size: 100%;
  appearance: none;
  block-size: 20px;
  background: transparent;
}

.range::-webkit-slider-runnable-track {
  block-size: 4px;
  background: color-mix(in oklab, var(--panel-text) 18%, transparent);
  border-radius: 999px;
}

.range::-webkit-slider-thumb {
  appearance: none;
  inline-size: 16px;
  block-size: 16px;
  border-radius: 999px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-line);
  box-shadow: var(--shadow-md);
  margin-top: -6px;
}

.range:focus-visible {
  outline: none;
}

.range:focus-visible::-webkit-slider-thumb {
  box-shadow: var(--shadow-md), var(--focus);
}

/* Firefox */
.range::-moz-range-track {
  block-size: 4px;
  background: color-mix(in oklab, var(--panel-text) 18%, transparent);
  border-radius: 999px;
}

.range::-moz-range-thumb {
  inline-size: 16px;
  block-size: 16px;
  border-radius: 999px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-line);
  box-shadow: var(--shadow-md);
}

/* =========
     Buttons
     ========= */
.btn {
  inline-size: 100%;
  min-block-size: 40px;
  border-radius: 16px;
  border: 1px solid var(--panel-line);
  background: var(--control-bg);
  color: inherit;
  font-weight: 650;
  cursor: pointer;
  transition:
    transform 0.06s ease,
    background 0.15s ease;
}

.btn:hover {
  background: var(--control-bg-hover);
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.btn--primary {
  background: var(--panel-text);
  color: var(--panel-bg);
  border-color: transparent;
}

@media (prefers-color-scheme: dark) {
  .btn--primary {
    background: #f1f1f1;
    color: #111;
  }
}

/* =========
     Helpers used by the panel markup
     ========= */
.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.toggle {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  user-select: none;
  color: var(--panel-subtle);
  font-size: 0.95rem;
}

.toggle input {
  inline-size: 16px;
  block-size: 16px;
  accent-color: var(--accent);
}

.hint {
  margin: 0;
  color: var(--panel-subtle);
  font-size: 0.95rem;
  line-height: 1.35;
}