/* ================================================================
   SEMCODAR BRANDBOOK — SECTION: BACKGROUND (10)
   ================================================================ */

/* ── Dual mode grid ── */
.bg-dual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 64px;
}

/* ── Mode card ── */
.bg-mode {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: border-color var(--t-slow), box-shadow var(--t-slow);
}

.bg-mode--dark {
  background: #1C1C1C;
  box-shadow:
    0 4px 32px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255,255,255,0.05);
}
.bg-mode--light {
  background: #FBF9F4;
  box-shadow:
    0 4px 32px rgba(0, 0, 0, 0.12),
    inset 0 1px 0 rgba(255,255,255,0.9);
  border-color: #DDD9D1;
}

/* ── Mode header ── */
.bg-mode__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid;
}
.bg-mode--dark  .bg-mode__header { border-color: #2C2C2C; }
.bg-mode--light .bg-mode__header { border-color: #DDD9D1; }

.bg-mode__badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 100px;
}
.bg-mode__badge--dark {
  background: rgba(255,255,255,0.06);
  color: #B2B2B2;
  border: 1px solid #363636;
}
.bg-mode__badge--light {
  background: rgba(0,0,0,0.04);
  color: #6A6461;
  border: 1px solid #DDD9D1;
}

.bg-mode__tag {
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--c-blue) 18%, transparent);
  color: var(--c-blue);
  border: 1px solid color-mix(in srgb, var(--c-blue) 28%, transparent);
}
.bg-mode__tag--alt {
  background: color-mix(in srgb, var(--c-purple) 12%, transparent);
  color: var(--c-purple);
  border-color: color-mix(in srgb, var(--c-purple) 22%, transparent);
}

/* ── Preview area ── */
.bg-mode__preview {
  position: relative;
  height: 160px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  gap: 0;
}
.bg-mode__preview--dark  { background: #1C1C1C; }
.bg-mode__preview--light { background: #FBF9F4; }

/* Layer strips inside preview */
.bg-layer {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 10px 8px;
  gap: 2px;
  position: relative;
  transition: flex 200ms ease;
}
.bg-layer:hover { flex: 1.3; }

.bg-layer__label {
  font-family: var(--f-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(251,249,244,0.5);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.bg-layer__hex {
  font-family: var(--f-mono);
  font-size: 9px;
  color: rgba(251,249,244,0.35);
}

/* Dark mode layer colors */
.bg-layer--1d { background: #1C1C1C; border-right: 1px solid #222; }
.bg-layer--2d { background: #171717; border-right: 1px solid #222; }
.bg-layer--3d { background: #252525; border-right: 1px solid #222; }
.bg-layer--4d { background: #2E2E2E; }

/* Light mode layer colors */
.bg-layer--1l { background: #FBF9F4; border-right: 1px solid #DDD9D1; }
.bg-layer--2l { background: #F3EFE8; border-right: 1px solid #DDD9D1; }
.bg-layer--3l { background: #FFFFFF; border-right: 1px solid #DDD9D1; }
.bg-layer--4l { background: #ECE9E3; }

/* ── Ambient orbs in preview ── */
.bg-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}
.bg-orb--blue {
  width: 140px; height: 140px;
  background: radial-gradient(circle, rgba(0,88,212,0.55) 0%, transparent 70%);
  filter: blur(30px);
  top: -40px; left: -20px;
  animation: orb-float 20s ease-in-out infinite;
}
.bg-orb--purple {
  width: 110px; height: 110px;
  background: radial-gradient(circle, rgba(175,109,255,0.5) 0%, transparent 70%);
  filter: blur(28px);
  top: 10px; right: 10px;
  animation: orb-float 25s ease-in-out infinite;
  animation-delay: -8s;
}
.bg-orb--green {
  width: 80px; height: 80px;
  background: radial-gradient(circle, rgba(99,208,89,0.3) 0%, transparent 70%);
  filter: blur(22px);
  bottom: 10px; left: 40%;
  animation: orb-float 22s ease-in-out infinite;
  animation-delay: -14s;
}
.bg-orb--blue-l {
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(0,88,212,0.18) 0%, transparent 70%);
  filter: blur(28px);
  top: -20px; left: 0;
}
.bg-orb--purple-l {
  width: 90px; height: 90px;
  background: radial-gradient(circle, rgba(175,109,255,0.15) 0%, transparent 70%);
  filter: blur(24px);
  top: 10px; right: 10px;
}

/* ── Tokens list ── */
.bg-mode__tokens {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bg-mode--dark  .bg-mode__tokens { border-top: 1px solid #2C2C2C; }
.bg-mode--light .bg-mode__tokens { border-top: 1px solid #DDD9D1; }

.bg-token {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bg-token__swatch {
  width: 28px;
  height: 28px;
  border-radius: var(--r-sm);
  flex-shrink: 0;
}

.bg-token__info {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.bg-token__var {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--c-blue);
  background: color-mix(in srgb, var(--c-blue) 10%, transparent);
  padding: 1px 6px;
  border-radius: 4px;
  white-space: nowrap;
}

.bg-token--light .bg-token__var {
  background: color-mix(in srgb, var(--c-blue) 08%, transparent);
}

.bg-token__desc {
  font-size: 11px;
  color: var(--text-3);
  flex: 1;
}

.bg-token__hex {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--text-3);
  margin-left: auto;
}

.bg-mode--light .bg-token__desc {
  color: #A09C98;
}

.bg-mode--light .bg-token__hex {
  color: #A09C98;
}

/* ── Section sub-title ── */
.bg-section-title {
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 24px;
  margin-top: 12px;
}

/* ── Layers diagram ── */
.bg-layers-diagram {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 52px;
}

.bg-layer-item {
  display: flex;
  align-items: center;
  gap: 16px;
  opacity: 0;
  transform: translateX(-16px);
  transition:
    opacity 500ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--layer-i) * 80ms + 100ms);
}
.section.in-view .bg-layer-item {
  opacity: 1;
  transform: translateX(0);
}

.bg-layer-item__num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--c-blue) 16%, transparent);
  color: var(--c-blue);
  border: 1px solid color-mix(in srgb, var(--c-blue) 28%, transparent);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.bg-layer-item__body {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--g-2, color-mix(in srgb, var(--surface) 80%, transparent));
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  flex: 1;
  backdrop-filter: blur(12px);
}

.bg-layer-item__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  background: color-mix(in srgb, var(--c-purple) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--c-purple) 20%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-purple);
  flex-shrink: 0;
}

.bg-layer-item__content {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.bg-layer-item__content strong {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.bg-layer-item__content span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-2);
}
.bg-layer-item__content code {
  font-family: var(--f-mono);
  font-size: 11px;
  background: color-mix(in srgb, var(--c-blue) 10%, transparent);
  color: var(--c-blue);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ── Rules ── */
.bg-rules {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 52px;
}

.bg-rule {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
}

.bg-rule__icon {
  width: 32px;
  height: 32px;
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.bg-rule--ok .bg-rule__icon {
  background: var(--rule-ok-bg);
  color: var(--rule-ok-text);
}
.bg-rule--no .bg-rule__icon {
  background: var(--rule-no-bg);
  color: var(--rule-no-text);
}
.bg-rule--ok {
  border-color: var(--rule-ok-border) !important;
}
.bg-rule--no {
  border-color: var(--rule-no-border) !important;
}

.bg-rule__content {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.bg-rule__content strong {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.bg-rule__content p {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-2);
}
.bg-rule__content code {
  font-family: var(--f-mono);
  font-size: 11px;
  background: color-mix(in srgb, var(--c-blue) 10%, transparent);
  color: var(--c-blue);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ── Theme switch callout ── */
.bg-theme-switch {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 22px 26px;
  margin-bottom: 16px;
}

.bg-theme-switch__left {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex: 1;
}
.bg-theme-switch__left strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.bg-theme-switch__left p {
  font-size: 12px;
  line-height: 1.65;
  color: var(--text-2);
}
.bg-theme-switch__left p code {
  font-family: var(--f-mono);
  font-size: 11px;
  background: color-mix(in srgb, var(--c-blue) 10%, transparent);
  color: var(--c-blue);
  padding: 1px 5px;
  border-radius: 3px;
}

.bg-theme-switch__icon {
  width: 42px;
  height: 42px;
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--c-purple) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--c-purple) 20%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-purple);
  flex-shrink: 0;
}

.bg-theme-switch__code {
  flex-shrink: 0;
}
.bg-theme-switch__code code {
  font-family: var(--f-mono);
  font-size: 11px;
  background: color-mix(in srgb, var(--c-green) 10%, transparent);
  color: var(--c-green);
  padding: 6px 12px;
  border-radius: var(--r-sm);
  border: 1px solid color-mix(in srgb, var(--c-green) 20%, transparent);
  white-space: nowrap;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .bg-dual { grid-template-columns: 1fr; }
  .bg-rules { grid-template-columns: 1fr; }
  .bg-theme-switch { flex-direction: column; align-items: flex-start; }
}