/* =====================================================
   HIGHLAND LONGEVITY — ANIMATED EXPLAINERS
   Code-built SVG diagrams that play once when scrolled
   into view, then rest on a labelled final frame.
   Loaded only on pages that contain [data-explainer].

   Palette: Highland Blue #4069a1 · Navy #1b2d45
            Gold #c9a96e · Teal #0a7e6f · Cream #f8f6f1
   ===================================================== */

.hl-explainer {
  --ex-blue: #4069a1;
  --ex-navy: #1b2d45;
  --ex-gold: #c9a96e;
  --ex-teal: #0a7e6f;
  --ex-line: rgba(64, 105, 161, 0.18);
  --ex-beat: 1.4s; /* time between beats */
  position: relative;
  max-width: 960px;
  margin: 0 auto 64px;
  padding: 32px 32px 28px;
  background: #ffffff;
  border: 1px solid rgba(64, 105, 161, 0.08);
  border-radius: 16px;
  box-shadow: 0 8px 40px rgba(64, 105, 161, 0.08);
}

.hl-explainer svg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 640 / 260; /* reserves space: zero layout shift */
  overflow: visible;
}

/* -----------------------------------------------------
   STEPS (real HTML text — readable by screen readers
   and search engines, legible at phone width)
   ----------------------------------------------------- */
.hl-explainer-steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(var(--ex-cols, 3), 1fr);
  gap: 24px;
  margin: 20px 0 0;
  padding: 0;
  counter-reset: ex-step;
}

.hl-explainer-steps li {
  counter-increment: ex-step;
  padding-top: 14px;
  border-top: 3px solid var(--ex-line);
  font-size: 0.95rem;
  line-height: 1.6;
  color: #5a5a5a;
  transition: border-color 0.5s ease, opacity 0.5s ease;
}

.hl-explainer-steps li strong {
  display: block;
  margin-bottom: 4px;
  font-family: 'Libre Baskerville', Georgia, serif;
  font-size: 1.02rem;
  color: var(--ex-navy);
}

.hl-explainer-steps li strong::before {
  content: counter(ex-step) '. ';
  color: var(--ex-gold);
}

.hl-explainer-replay {
  position: absolute;
  top: 14px;
  right: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font: 500 0.75rem/1 'Jost', sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ex-blue);
  background: rgba(64, 105, 161, 0.06);
  border: 1px solid rgba(64, 105, 161, 0.15);
  border-radius: 9999px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease, background 0.2s ease;
}

.hl-explainer.is-done .hl-explainer-replay {
  opacity: 1;
  pointer-events: auto;
}

.hl-explainer-replay:hover { background: rgba(64, 105, 161, 0.12); }
.hl-explainer-replay:focus-visible { outline: 2px solid var(--ex-blue); outline-offset: 2px; }

/* -----------------------------------------------------
   SHARED SVG PRIMITIVES
   Default state = FINAL frame. Animations only run while
   .is-playing is set, so no-JS, reduced-motion and
   crawlers all see the finished diagram.
   ----------------------------------------------------- */
.ex-panel { fill: #f8f6f1; stroke: var(--ex-line); stroke-width: 1.5; }
.ex-ink { fill: none; stroke: var(--ex-navy); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.ex-ink-blue { fill: none; stroke: var(--ex-blue); stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.ex-flow { fill: none; stroke: var(--ex-gold); stroke-width: 2.5; stroke-linecap: round; stroke-dasharray: 4 8; }
.ex-label { font: 600 13px 'Jost', sans-serif; letter-spacing: 0.12em; text-transform: uppercase; fill: var(--ex-blue); }

/* =====================================================
   GLP-1 EXPLAINER  (data-explainer="glp1")
   Beat 1: weekly dose → Beat 2: brain fullness signal
   → Beat 3: stomach empties slowly, hunger eases
   ===================================================== */

/* Beat 1 — the pen and its dose pulse */
.hl-explainer.is-playing [data-beat="1"] { animation: ex-pop 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) both; }
.hl-explainer.is-playing .glp1-dose { animation: ex-dose 1s ease-in-out 0.5s both; }

/* Flow lines draw from the pen to the brain and stomach */
.hl-explainer.is-playing .glp1-flow-brain { animation: ex-flow-in 0.9s ease-out calc(var(--ex-beat) * 0.8) both, ex-flow-run 1.2s linear calc(var(--ex-beat) * 0.8) 3; }
.hl-explainer.is-playing .glp1-flow-gut { animation: ex-flow-in 0.9s ease-out calc(var(--ex-beat) * 1.8) both, ex-flow-run 1.2s linear calc(var(--ex-beat) * 1.8) 3; }

/* Beat 2 — brain appears, fullness signal radiates */
.hl-explainer.is-playing [data-beat="2"] { animation: ex-fade-up 0.7s ease-out var(--ex-beat) both; }
.glp1-signal { fill: none; stroke: var(--ex-teal); stroke-width: 2; transform-box: fill-box; transform-origin: center; }
.hl-explainer.is-playing .glp1-signal { animation: ex-ripple 1.6s ease-out calc(var(--ex-beat) * 1.3) 2 both; }
.hl-explainer.is-playing .glp1-signal:nth-of-type(2) { animation-delay: calc(var(--ex-beat) * 1.3 + 0.5s); }
.glp1-core { fill: var(--ex-teal); }
.hl-explainer.is-playing .glp1-core { animation: ex-glow 1.6s ease-in-out calc(var(--ex-beat) * 1.3) 2; }

/* Beat 3 — stomach appears, food settles slowly */
.hl-explainer.is-playing [data-beat="3"] { animation: ex-fade-up 0.7s ease-out calc(var(--ex-beat) * 2) both; }
.glp1-food { fill: var(--ex-gold); }
.hl-explainer.is-playing .glp1-food { animation: ex-settle 2.6s cubic-bezier(0.22, 1, 0.36, 1) calc(var(--ex-beat) * 2.2) both; }
.hl-explainer.is-playing .glp1-food:nth-of-type(2) { animation-delay: calc(var(--ex-beat) * 2.2 + 0.2s); }
.hl-explainer.is-playing .glp1-food:nth-of-type(3) { animation-delay: calc(var(--ex-beat) * 2.2 + 0.4s); }

/* Hunger gauge eases down (no numbers — direction only) */
.glp1-gauge-fill { fill: var(--ex-blue); transform-box: fill-box; transform-origin: left center; transform: scaleX(0.35); }
.hl-explainer.is-playing .glp1-gauge-fill { animation: ex-gauge 2.4s cubic-bezier(0.65, 0, 0.35, 1) calc(var(--ex-beat) * 2.6) both; }

/* Steps highlight in sync with each beat */
.hl-explainer.is-playing .hl-explainer-steps li { animation: ex-step-dim 0.01s both; }
.hl-explainer.is-playing .hl-explainer-steps li:nth-child(1) { animation: ex-step-on 0.5s ease 0.2s both; }
.hl-explainer.is-playing .hl-explainer-steps li:nth-child(2) { animation: ex-step-on 0.5s ease var(--ex-beat) both; }
.hl-explainer.is-playing .hl-explainer-steps li:nth-child(3) { animation: ex-step-on 0.5s ease calc(var(--ex-beat) * 2) both; }

/* Generic 4th beat + 4th step (hormone cycle) */
.hl-explainer.is-playing [data-beat="4"] { animation: ex-fade-up 0.7s ease-out calc(var(--ex-beat) * 3) both; }
.hl-explainer.is-playing .hl-explainer-steps li:nth-child(4) { animation: ex-step-on 0.5s ease calc(var(--ex-beat) * 3) both; }

/* =====================================================
   TIRZEPATIDE EXPLAINER  (data-explainer="tirzepatide")
   Same rhythm as GLP-1; middle panel shows two receptors
   ===================================================== */
.tirz-dock { fill: none; stroke-width: 2.5; }
.tirz-dock--gip { stroke: var(--ex-teal); }
.tirz-dock--glp { stroke: var(--ex-gold); }
.tirz-key--gip { fill: var(--ex-teal); }
.tirz-key--glp { fill: var(--ex-gold); }
.hl-explainer.is-playing .tirz-key--gip { animation: ex-dock 0.9s cubic-bezier(0.22, 1, 0.36, 1) calc(var(--ex-beat) * 1.2) both; }
.hl-explainer.is-playing .tirz-key--glp { animation: ex-dock 0.9s cubic-bezier(0.22, 1, 0.36, 1) calc(var(--ex-beat) * 1.45) both; }

/* =====================================================
   DEXA EXPLAINER  (data-explainer="dexa")
   Scan arm sweeps → fat / lean / bone separate → compare
   ===================================================== */
.dexa-beam { fill: rgba(64, 105, 161, 0.18); stroke: var(--ex-blue); stroke-width: 1.5; }
.dexa-beam { transform: translateX(118px); }
.hl-explainer.is-playing .dexa-beam { animation: ex-sweep 2s cubic-bezier(0.65, 0, 0.35, 1) 0.4s both; }
.dexa-bar { transform-box: fill-box; transform-origin: left center; }
.dexa-bar--fat { fill: var(--ex-gold); }
.dexa-bar--lean { fill: var(--ex-blue); }
.dexa-bar--bone { fill: var(--ex-navy); }
.hl-explainer.is-playing .dexa-bar { animation: ex-grow 0.9s cubic-bezier(0.22, 1, 0.36, 1) both; }
.hl-explainer.is-playing .dexa-bar--fat { animation-delay: calc(var(--ex-beat) * 1.2); }
.hl-explainer.is-playing .dexa-bar--lean { animation-delay: calc(var(--ex-beat) * 1.4); }
.hl-explainer.is-playing .dexa-bar--bone { animation-delay: calc(var(--ex-beat) * 1.6); }
.dexa-arrow { fill: none; stroke: var(--ex-gold); stroke-width: 2.5; stroke-linecap: round; stroke-dasharray: 160; stroke-dashoffset: 0; }
.hl-explainer.is-playing .dexa-arrow { animation: ex-draw 1.2s ease-out calc(var(--ex-beat) * 2.3) both; }

/* =====================================================
   HORMONE CARE CYCLE  (data-explainer="hormone-cycle")
   Test → review → treat → re-test, then the loop repeats
   ===================================================== */
.cyc-ring { fill: none; stroke: var(--ex-line); stroke-width: 2; }
.cyc-arc { fill: none; stroke: var(--ex-gold); stroke-width: 3; stroke-linecap: round; stroke-dasharray: 600; stroke-dashoffset: 0; }
.hl-explainer.is-playing .cyc-arc { animation: ex-draw-long calc(var(--ex-beat) * 3.4) linear 0.3s both; }
.cyc-node { fill: #ffffff; stroke: var(--ex-blue); stroke-width: 2; }
.cyc-label { font: 600 13px 'Jost', sans-serif; letter-spacing: 0.08em; text-transform: uppercase; fill: var(--ex-navy); }
.hl-explainer[data-explainer="hormone-cycle"] svg { aspect-ratio: 380 / 260; max-width: 460px; margin: 0 auto; }

/* -----------------------------------------------------
   KEYFRAMES
   ----------------------------------------------------- */
@keyframes ex-pop      { from { opacity: 0; transform: scale(0.85); } to { opacity: 1; transform: none; } }
@keyframes ex-fade-up  { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes ex-dose     { 0% { transform: translateY(-14px); } 60% { transform: translateY(0); } 100% { transform: translateY(0); } }
@keyframes ex-flow-in  { from { opacity: 0; } to { opacity: 1; } }
@keyframes ex-flow-run { to { stroke-dashoffset: -24; } }
@keyframes ex-ripple   { 0% { opacity: 0.9; transform: scale(0.6); } 100% { opacity: 0; transform: scale(1.6); } }
@keyframes ex-glow     { 0%, 100% { opacity: 1; } 50% { opacity: 0.45; } }
@keyframes ex-settle   { from { transform: translateY(-34px); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes ex-gauge    { from { transform: scaleX(1); } to { transform: scaleX(0.35); } }
@keyframes ex-dock     { from { transform: translateY(-26px); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes ex-sweep    { from { transform: translateX(0); } to { transform: translateX(118px); } }
@keyframes ex-grow     { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes ex-draw     { from { stroke-dashoffset: 160; } to { stroke-dashoffset: 0; } }
@keyframes ex-draw-long { from { stroke-dashoffset: 600; } to { stroke-dashoffset: 0; } }
@keyframes ex-step-dim { to { opacity: 0.35; border-color: var(--ex-line); } }
@keyframes ex-step-on  { from { opacity: 0.35; border-color: var(--ex-line); } to { opacity: 1; border-color: var(--ex-gold); } }

/* Armed (JS loaded, not yet scrolled to): hold the opening frame so
   the patient never sees the finished diagram "rewind". */
.hl-explainer.is-armed:not(.is-playing) [data-beat],
.hl-explainer.is-armed:not(.is-playing) .ex-flow,
.hl-explainer.is-armed:not(.is-playing) .glp1-food { opacity: 0; }
.hl-explainer.is-armed:not(.is-playing) .glp1-gauge-fill { transform: scaleX(1); }
.hl-explainer.is-armed:not(.is-playing) .hl-explainer-steps li { opacity: 0.35; }

.hl-explainer.is-armed:not(.is-playing) :is(.tirz-key--gip, .tirz-key--glp) { opacity: 0; }
.hl-explainer.is-armed:not(.is-playing) .dexa-beam { transform: translateX(0); }
.hl-explainer.is-armed:not(.is-playing) .dexa-bar { transform: scaleX(0); }
.hl-explainer.is-armed:not(.is-playing) .dexa-arrow { stroke-dashoffset: 160; }
.hl-explainer.is-armed:not(.is-playing) .cyc-arc { stroke-dashoffset: 600; }

/* SVG groups animate around their own box */
.hl-explainer [data-beat] { transform-box: fill-box; transform-origin: center; }

/* -----------------------------------------------------
   RESPONSIVE + ACCESSIBILITY
   ----------------------------------------------------- */
@media (max-width: 768px) {
  .hl-explainer { padding: 20px 16px 18px; margin-bottom: 40px; }
  .hl-explainer-steps { grid-template-columns: 1fr; gap: 14px; }
  .hl-explainer-replay { top: 8px; right: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .hl-explainer *,
  .hl-explainer.is-playing * { animation: none !important; }
  .hl-explainer-replay { display: none; }
}