/* isaiah: responsive Flexbox shell.
 *
 * Phase 1 lays out four empty panels (spectrum, visualizer, generator
 * controls, readouts) with Flexbox. The panels are wired to the C9 State/Sync
 * Bus in src/main.js; later phases fill in their contents.
 *
 * Reflow: panels wrap and stack on narrow viewports (mobile, ~375px) and sit
 * in a multi-panel row on wide viewports (desktop, ~1440px).
 */

:root {
  --gap: 0.75rem;
  --panel-bg: #15161a;
  --panel-border: #2a2c33;
  --ink: #e8e8ea;
  --ink-dim: #9a9ca3;
  --bg: #0c0d10;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  padding: var(--gap) 1rem;
  border-bottom: 1px solid var(--panel-border);
}

.app-header h1 {
  margin: 0;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.app-header p {
  margin: 0.25rem 0 0;
  color: var(--ink-dim);
  font-size: 0.85rem;
}

/* The shell: a flex container of panels. Wraps so panels stack when there is
 * not enough horizontal room. */
.app-shell {
  flex: 1 1 auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap);
  padding: var(--gap);
  align-content: flex-start;
}

.panel {
  flex: 1 1 22rem;
  min-width: 0;
  min-height: 12rem;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 1rem;
}

.panel__title {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.panel__body {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-dim);
  font-size: 0.85rem;
  text-align: center;
}

/* Panels that hold real content (spectrum view, generator controls, readouts)
 * use a top-aligned vertical Flexbox column instead of the centered placeholder
 * layout. */
.panel__body--block {
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: var(--gap);
  text-align: left;
  color: var(--ink);
}

/* The spectrum panel reads wide; give it room to span the full row on desktop
 * while still collapsing to a single column on mobile. */
.panel--spectrum {
  flex-basis: 100%;
}

/* ---- Spectrum view (Phase 5) -------------------------------------------- */

/* The visible-light spectrum band, 380 nm (violet) to 750 nm (red). The marker
 * is positioned by src/render/spectrum-view.js off the C9 bus (SELECTED_NM). */
.spectrum-band {
  position: relative;
  width: 100%;
  height: 2.5rem;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: linear-gradient(
    to right,
    #7400b8 0%,
    #4361ee 18%,
    #1ec8ff 32%,
    #2ecc71 48%,
    #f9e000 64%,
    #ff8c00 80%,
    #e01e1e 100%
  );
}

.spectrum-band__marker {
  position: absolute;
  top: -2px;
  bottom: -2px;
  left: 54%;
  width: 2px;
  background: var(--ink);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6);
  transform: translateX(-1px);
}

.spectrum-band__label {
  position: absolute;
  top: -1.4rem;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 0.75rem;
  color: var(--ink);
}

.spectrum-band__scale {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--ink-dim);
}

/* ---- Generator controls (Phase 5) --------------------------------------- */

.control__label {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-dim);
  margin-bottom: 0.35rem;
}

.control__row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.control__row--buttons {
  gap: var(--gap);
}

.control__slider {
  flex: 1 1 8rem;
  min-width: 0;
}

.control__number {
  flex: 0 1 6rem;
  min-width: 4rem;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 0.3rem 0.4rem;
  font: inherit;
}

.control__unit {
  font-size: 0.8rem;
  color: var(--ink-dim);
}

.btn {
  flex: 1 1 auto;
  background: #22242b;
  color: var(--ink);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  font: inherit;
  cursor: pointer;
}

.btn:hover {
  background: #2c2f37;
}

/* ---- Readouts + swatch + out-of-gamut badge (Phase 5, ADR-A2) ----------- */

.readouts {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.readouts__row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 0.3rem;
}

.readouts__key {
  margin: 0;
  font-size: 0.8rem;
  color: var(--ink-dim);
}

.readouts__value {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.readouts__value--color {
  font-weight: 500;
  font-size: 0.85rem;
}

.swatch-wrap {
  display: flex;
}

.swatch {
  position: relative;
  flex: 1 1 auto;
  height: 3.25rem;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background-color: #000;
  overflow: hidden;
}

/* Out-of-gamut hatch overlay (ADR-A2): a diagonal hatch laid over the clamped
 * swatch so it is visibly flagged as a gamut-limited approximation. */
.swatch--out-of-gamut::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(0, 0, 0, 0.55) 0,
    rgba(0, 0, 0, 0.55) 4px,
    rgba(255, 255, 255, 0.25) 4px,
    rgba(255, 255, 255, 0.25) 8px
  );
  pointer-events: none;
}

/* Out-of-gamut corner badge (ADR-A2). */
.swatch__badge {
  position: absolute;
  top: 0.35rem;
  right: 0.35rem;
  background: rgba(12, 13, 16, 0.85);
  color: var(--ink);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 0.15rem 0.4rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.gamut-disclosure {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--ink-dim);
}

/* The [hidden] badge/disclosure must not show. An explicit display:none beats
 * any layout rule above (tested behavior, not just markup). */
[hidden] {
  display: none !important;
}

/* Mobile: one panel per row. Below this width Flexbox stacks every panel. */
@media (max-width: 700px) {
  .app-shell {
    flex-direction: column;
    flex-wrap: nowrap;
  }

  .panel {
    flex: 0 0 auto;
    width: 100%;
  }
}