/* Method section — Six Principles interactive */

.method-wrap { width: 100%; }

.method-lede {
  font-family: "Newsreader","Instrument Serif",serif;
  font-size: clamp(17px, 1.7vw, 22px);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 70ch;
  margin: 0 0 36px;
}
.method-lede em { color: var(--accent); font-style: italic; }

/* ── PRINCIPLE STRIP (tabs) ── */
.mth-strip {
  display: grid; grid-template-columns: repeat(6, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0;
}
.mth-tab {
  padding: 22px 16px 18px;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--rule);
  text-align: left;
  cursor: pointer;
  display: flex; flex-direction: column; gap: 4px;
  transition: background 0.15s, color 0.15s;
}
.mth-tab:last-child { border-right: 0; }
.mth-tab:hover:not([data-active="true"]) { background: var(--accent-soft); }
.mth-tab[data-active="true"] { background: var(--ink); color: var(--paper); }

.mth-tab-num {
  font-family: "JetBrains Mono","IBM Plex Mono",monospace;
  font-size: 11px; letter-spacing: 0.18em;
  color: var(--accent);
}
.mth-tab[data-active="true"] .mth-tab-num { color: var(--paper); opacity: 0.8; }
.mth-tab-title {
  font-family: "Newsreader",serif;
  font-size: 17px; font-style: italic;
  line-height: 1.1; color: var(--ink);
  letter-spacing: -0.01em;
}
.mth-tab[data-active="true"] .mth-tab-title { color: var(--paper); }
.mth-tab-tag {
  font-family: "JetBrains Mono",monospace;
  font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-3);
}
.mth-tab[data-active="true"] .mth-tab-tag { color: rgba(255,255,255,0.55); }

/* ── STAGE ── */
.mth-stage {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  border: 1px solid var(--rule);
  border-top: 0;
  background: var(--paper);
  min-height: 460px;
}

.mth-vis {
  border-right: 1px solid var(--rule);
  padding: 36px 40px;
  display: flex; flex-direction: column;
  align-items: stretch; justify-content: center;
  background: var(--paper-2);
  gap: 18px;
  position: relative;
  overflow: hidden;
}
.mth-vis-svg { width: 100%; height: auto; max-height: 320px; }

.mth-vis-controls {
  display: flex; flex-wrap: wrap; gap: 10px;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--rule-2);
}
.mth-btn {
  font-family: "JetBrains Mono","IBM Plex Mono",monospace;
  font-size: 11px; letter-spacing: 0.08em;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.mth-btn:hover { background: var(--ink); color: var(--paper); }
.mth-btn[data-on="true"] { background: var(--ink); color: var(--paper); }
.mth-btn.accent { color: var(--accent); border-color: var(--accent); }
.mth-btn.accent:hover { background: var(--accent); color: var(--paper); }
.mth-btn.accent[data-on="true"] { background: var(--accent); color: var(--paper); }

.mth-slider-row { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 200px; }
.mth-slider {
  flex: 1; height: 4px;
  -webkit-appearance: none; appearance: none;
  background: var(--rule);
  outline: none;
  cursor: pointer;
}
.mth-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
}
.mth-slider::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 0;
}
.mth-slider-label {
  font-family: "JetBrains Mono",monospace;
  font-size: 10px; letter-spacing: 0.06em;
  color: var(--ink-3);
  min-width: 60px;
}
.mth-slider-val {
  font-family: "JetBrains Mono",monospace;
  font-size: 12px; color: var(--accent);
  font-weight: 600;
  min-width: 50px; text-align: right;
}

.mth-readout {
  display: flex; gap: 18px; flex-wrap: wrap;
  padding-top: 14px;
  border-top: 1px solid var(--rule-2);
}
.mth-readout-item {
  display: flex; flex-direction: column; gap: 2px;
}
.mth-readout-label {
  font-family: "JetBrains Mono",monospace;
  font-size: 9px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-3);
}
.mth-readout-val {
  font-family: "Newsreader",serif;
  font-size: 22px; font-style: italic;
  color: var(--accent); line-height: 1;
}

/* Right side: body */
.mth-body {
  padding: 40px 44px;
  display: flex; flex-direction: column; gap: 16px;
}
.mth-body-meta {
  font-family: "JetBrains Mono",monospace;
  font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent);
}
.mth-body-title {
  font-family: "Newsreader","Instrument Serif",serif;
  font-size: clamp(32px, 4vw, 52px);
  font-style: italic; font-weight: 400;
  line-height: 0.95; letter-spacing: -0.02em;
  color: var(--ink);
}
.mth-body-text {
  font-size: 15px; line-height: 1.6;
  color: var(--ink-2); max-width: 50ch;
}
.mth-body-text em { color: var(--accent); font-style: italic; }

.mth-body-cues {
  margin-top: 8px; padding-top: 16px;
  border-top: 1px solid var(--rule-2);
}
.mth-body-cues-label {
  font-family: "JetBrains Mono",monospace;
  font-size: 9px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.mth-body-cues-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 5px;
}
.mth-body-cues-list li {
  font-family: "JetBrains Mono",monospace;
  font-size: 11px; letter-spacing: 0.03em;
  color: var(--ink); display: flex; align-items: baseline; gap: 8px;
}
.mth-body-cues-list li::before {
  content: "▸"; color: var(--accent); font-size: 10px;
}

/* ── SVG STYLE HELPERS ── */
.m-svg-bg { fill: var(--paper); }
.m-z-disk { stroke: var(--ink); stroke-width: 4; stroke-linecap: round; transition: x1 0.9s cubic-bezier(.4,.0,.3,1), x2 0.9s cubic-bezier(.4,.0,.3,1), transform 0.9s cubic-bezier(.4,.0,.3,1); }
.m-actin { stroke: var(--ink-2); stroke-width: 2; fill: none; stroke-linecap: round; transition: transform 0.9s cubic-bezier(.4,.0,.3,1); }
.m-myosin { fill: var(--ink); }
.m-myosin-head { stroke: var(--accent); stroke-width: 1.6; fill: none; stroke-linecap: round; transition: transform 0.4s ease-out; transform-origin: center; transform-box: fill-box; }
.m-myosin-head.bound { stroke: var(--accent); }
.m-calcium { fill: var(--accent); opacity: 0; }
.m-calcium.active { animation: caBurst 1.4s ease-out forwards; }
@keyframes caBurst {
  0%   { opacity: 0; transform: translate(0,0) scale(0.4); }
  20%  { opacity: 0.9; }
  100% { opacity: 0; transform: translate(var(--dx,0), var(--dy,0)) scale(1.4); }
}
@keyframes pulse-glow {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 0.85; }
}
.m-pressurized { animation: pulse-glow 2s ease-in-out infinite; }

.m-mu-bar { transition: fill 0.35s, opacity 0.35s, transform 0.3s; transform-origin: left center; }
.m-mu-bar-bg { fill: var(--rule); }
.m-mu-bar-active { fill: var(--accent); }

.m-cyl-region { fill: var(--paper); stroke: var(--ink); stroke-width: 1.2; cursor: pointer; transition: fill 0.3s; }
.m-cyl-region:hover { fill: var(--accent-soft); }
.m-cyl-region.active { fill: var(--accent); fill-opacity: 0.35; stroke: var(--accent); stroke-width: 2; }

.m-rib { fill: none; stroke: var(--ink); stroke-width: 1.5; transition: d 1s ease-in-out; }
.m-lung { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1; transition: d 1s ease-in-out, fill-opacity 1s; }

/* ── RESPONSIVE ── */
@media (max-width: 1100px) {
  .mth-stage { grid-template-columns: 1fr; }
  .mth-vis { border-right: 0; border-bottom: 1px solid var(--rule); padding: 28px; }
  .mth-body { padding: 28px; }
}
@media (max-width: 760px) {
  .mth-strip { grid-template-columns: repeat(3, 1fr); }
  .mth-tab { border-bottom: 1px solid var(--rule); padding: 14px 12px; }
  .mth-tab:nth-child(3) { border-right: 0; }
  .mth-tab:nth-child(4), .mth-tab:nth-child(5), .mth-tab:nth-child(6) { border-bottom: 0; }
  .mth-vis { padding: 22px 18px; }
  .mth-body { padding: 24px 20px; }
  .mth-vis-controls { gap: 8px; }
  .mth-slider-row { min-width: 100%; }
}