/* ==========================================================================
   Enigma — Face Fitness & LED: steps, light-bath stage, wavelength controls
   ========================================================================== */

.ff { display: grid; gap: var(--space-l); padding: var(--space-xl) var(--gutter); }
.ff .shead { margin-bottom: 0; }

/* ---------- LED: the whole section takes on the chosen light ---------- */
.led {
  position: relative; isolation: isolate; overflow: hidden;
  display: grid; gap: var(--space-l); padding: var(--space-xl) var(--gutter);
  transition: --led 900ms var(--ease-soft);
}
.led::before {
  content: ''; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(46% 38% at 50% 56%, color-mix(in srgb, var(--led) 24%, transparent), transparent 74%);
}
.led__head { display: grid; gap: 1.1rem; max-width: 46rem; }
.led__intro { color: var(--muted); max-width: 48ch; }

.led__stage { position: relative; margin-bottom: clamp(2rem, 5vw, 4rem); }
.led__face {
  position: relative; isolation: isolate; overflow: hidden; aspect-ratio: 2.25 / 1; border-radius: var(--r-pill);
  box-shadow: 0 0 140px -30px color-mix(in srgb, var(--led) 60%, transparent);
}
.led__face img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.08) brightness(0.95); }
.led__tint { position: absolute; inset: 0; background: var(--led); mix-blend-mode: color; opacity: 0.85; }
.led__bloom {
  position: absolute; inset: 0; mix-blend-mode: screen; opacity: 0.38;
  background: radial-gradient(55% 85% at 42% 45%, var(--led), transparent 72%);
}

.lamp {
  position: absolute; right: 5%; bottom: -16%; width: clamp(140px, 17vw, 240px); aspect-ratio: 1; border-radius: 50%;
  background: radial-gradient(circle, var(--espresso-3) 0 56%, var(--espresso-2) 58% 100%);
  box-shadow: 0 30px 60px -18px rgba(0, 0, 0, 0.7), inset 0 0 0 1px rgba(255, 255, 255, 0.07), 0 0 0 10px rgba(25, 17, 15, 0.6);
}
.lamp__ring { position: absolute; inset: 0; }
.lamp__dot {
  position: absolute; left: 50%; top: 50%; width: 6.5%; aspect-ratio: 1; margin: -3.25%; border-radius: 50%;
  background: var(--led); box-shadow: 0 0 10px 2px color-mix(in srgb, var(--led) 70%, transparent);
  transform: rotate(var(--a)) translateY(-560%);
}
.lamp__core {
  position: absolute; inset: 27%; border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--led) 55%, white), var(--led) 42%, transparent 72%);
  filter: blur(3px);
}
.led.is-switching .lamp__dot { animation: ledpulse 820ms var(--ease-out) both; animation-delay: calc(var(--k) * 16ms); }
@keyframes ledpulse {
  0% { opacity: 0.1; transform: rotate(var(--a)) translateY(-560%) scale(0.5); }
  55% { opacity: 1; transform: rotate(var(--a)) translateY(-560%) scale(1.35); }
  100% { opacity: 1; transform: rotate(var(--a)) translateY(-560%) scale(1); }
}

.led__panel { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--space-m) var(--space-l); align-items: center; }
.led__controls { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.led-btn {
  display: grid; grid-template-columns: auto auto; grid-template-areas: "dot label" "dot nm"; column-gap: 0.75rem; align-items: center;
  padding: 0.65rem 1.25rem 0.65rem 0.9rem; border-radius: var(--r-pill); text-align: left;
  box-shadow: inset 0 0 0 1px var(--line); transition: box-shadow var(--t-med), background-color var(--t-med), transform var(--t-fast);
}
.led-btn:hover { box-shadow: inset 0 0 0 1px var(--line-strong); }
.led-btn:active { transform: scale(0.97); }
.led-btn__dot { grid-area: dot; width: 16px; height: 16px; border-radius: 50%; background: var(--c); box-shadow: 0 0 0 3px color-mix(in srgb, var(--c) 22%, transparent); transition: box-shadow var(--t-med); }
.led-btn__label { grid-area: label; font-weight: 600; font-size: 0.95rem; line-height: 1.15; }
.led-btn__nm { grid-area: nm; font-size: 0.74rem; color: var(--muted); line-height: 1.2; }
.led-btn.is-active { background: color-mix(in srgb, var(--c) 13%, transparent); box-shadow: inset 0 0 0 1px var(--c); }
.led-btn.is-active .led-btn__dot { box-shadow: 0 0 16px 4px var(--c); }

.led__readout { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1.6rem; align-items: center; }
.led__nm { font-family: var(--f-serif); font-size: clamp(3rem, 2rem + 3vw, 5.6rem); line-height: 0.9; color: var(--led); white-space: nowrap; font-variant-numeric: tabular-nums; }
.led__nm small { font-family: var(--f-sans); font-size: 0.3em; color: var(--muted); }
.led__text { font-size: var(--fs-lead); line-height: 1.4; max-width: 34ch; transition: opacity 280ms, transform 500ms var(--ease-out); }
.led__text.is-fading { opacity: 0; transform: translateY(8px); }
.led__note { font-size: var(--fs-small); color: var(--muted); }

@media (max-width: 1080px) { .led__panel { grid-template-columns: 1fr; } }
@media (max-width: 640px) {
  .led__face { aspect-ratio: 1.25 / 1; border-radius: 40px; }
  .lamp { width: 120px; bottom: -44px; right: 7%; }
  .led__readout { grid-template-columns: 1fr; gap: 0.6rem; }
  .led-btn { flex: 1 1 calc(50% - 0.3rem); }
}