@font-face {
  font-family: "Playfair Display";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../../../assets/fonts/playfair-display-v40-latin-700.woff2") format("woff2");
}

@font-face {
  font-family: "Source Sans 3";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../../../assets/fonts/source-sans-3-v19-latin-regular.woff2") format("woff2");
}

@font-face {
  font-family: "Source Sans 3";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../../../assets/fonts/source-sans-3-v19-latin-600.woff2") format("woff2");
}

* {
  box-sizing: border-box;
}

:root {
  --collapse-bg: #101611;
  --collapse-bg-deep: #070b08;
  --collapse-ink: #f5f6ef;
  --collapse-muted: rgba(232, 235, 226, 0.72);
  --collapse-dim: rgba(232, 235, 226, 0.48);
  --collapse-rule: rgba(169, 200, 163, 0.24);
  --collapse-rule-strong: rgba(169, 200, 163, 0.40);
  --collapse-sage: #a9c8a3;
  --collapse-gold: #c9a44a;
  --collapse-copper: #b97a48;
  --collapse-red: #d6845d;
  --collapse-surface: rgba(249, 251, 249, 0.045);
  --collapse-surface-strong: rgba(249, 251, 249, 0.075);
  --collapse-radius: 8px;
}

html {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  background: var(--collapse-bg);
}

body {
  margin: 0;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--collapse-ink);
  background:
    linear-gradient(135deg, rgba(169, 200, 163, 0.08) 0 1px, transparent 1px 18px),
    linear-gradient(180deg, var(--collapse-bg) 0%, var(--collapse-bg-deep) 100%);
  font-family: "Source Sans 3", var(--sans), system-ui, sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

code {
  font-family: var(--mono), "Courier New", monospace;
}

.collapse-shell {
  width: min(1260px, calc(100% - 32px));
  margin: 0 auto;
  padding: 76px 0 58px;
}

.collapse-hero {
  max-width: 940px;
  margin-bottom: 30px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--collapse-gold);
  font-family: var(--mono), "Courier New", monospace;
  font-size: 0.78rem;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  font-family: "Playfair Display", Georgia, serif;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 980px;
  font-size: clamp(2.35rem, 5vw, 4.75rem);
  line-height: 1.02;
}

.lede {
  margin: 16px 0 0;
  max-width: 900px;
  color: var(--collapse-sage);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.15rem, 2.2vw, 1.6rem);
}

.hero-note {
  max-width: 880px;
  margin: 15px 0 0;
  color: var(--collapse-muted);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
}

.collapse-lab {
  display: grid;
  gap: 18px;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.stats-strip div,
.canvas-panel,
.control-panel,
.reading-notes article {
  border: 1px solid var(--collapse-rule);
  border-radius: var(--collapse-radius);
  background: var(--collapse-surface);
  box-shadow: 0 20px 58px rgba(0, 0, 0, 0.22);
}

.stats-strip div {
  min-width: 0;
  padding: 14px 15px;
}

.stats-strip span,
.panel-heading p,
.control-label,
.formula-title {
  display: block;
  color: var(--collapse-dim);
  font-family: var(--mono), "Courier New", monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.stats-strip strong {
  display: block;
  min-height: 2.2em;
  margin-top: 4px;
  color: var(--collapse-sage);
  font-size: clamp(1.05rem, 2vw, 1.55rem);
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.instrument-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.58fr) minmax(320px, 0.78fr);
  gap: 18px;
  align-items: stretch;
}

.canvas-panel,
.control-panel {
  min-width: 0;
  padding: 18px;
}

.panel-heading {
  margin-bottom: 14px;
}

.panel-heading h2 {
  margin: 4px 0 0;
  font-size: clamp(1.35rem, 2.4vw, 2.15rem);
  line-height: 1.08;
}

.canvas-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(232, 235, 226, 0.11);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(17, 26, 20, 0.98), rgba(5, 8, 6, 0.98)),
    repeating-linear-gradient(90deg, rgba(169, 200, 163, 0.05) 0 1px, transparent 1px 82px);
}

#collapse-canvas {
  display: block;
  width: 100%;
  height: 580px;
}

.canvas-desc {
  margin: 0;
  padding: 10px 13px 12px;
  border-top: 1px solid rgba(169, 200, 163, 0.18);
  color: rgba(232, 235, 226, 0.68);
  background: rgba(7, 11, 8, 0.78);
  font-size: 0.92rem;
}

.control-panel {
  display: grid;
  align-content: start;
  gap: 18px;
}

.slider-block label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 11px;
  color: var(--collapse-muted);
  font-weight: 600;
}

.slider-block strong {
  flex: 0 0 auto;
  color: var(--collapse-gold);
  font-family: var(--mono), "Courier New", monospace;
}

#generation-slider {
  display: block;
  width: 100%;
  accent-color: var(--collapse-gold);
  cursor: pointer;
}

.tick-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  margin-top: 8px;
  color: var(--collapse-dim);
  font-family: var(--mono), "Courier New", monospace;
  font-size: 0.68rem;
}

.tick-row span:nth-child(2),
.tick-row span:nth-child(3),
.tick-row span:nth-child(4) {
  text-align: center;
}

.tick-row span:last-child {
  text-align: right;
}

.jump-buttons,
.sim-buttons {
  display: grid;
  gap: 8px;
}

.jump-buttons {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sim-buttons {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.jump-button,
.utility-button {
  min-width: 0;
  min-height: 42px;
  border: 1px solid rgba(169, 200, 163, 0.25);
  border-radius: 6px;
  color: var(--collapse-muted);
  background: rgba(249, 251, 249, 0.035);
  font: 600 0.96rem/1.15 "Source Sans 3", var(--sans), system-ui, sans-serif;
  letter-spacing: 0;
  cursor: pointer;
  transition: border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.jump-button.is-active {
  border-color: rgba(201, 164, 74, 0.78);
  color: var(--collapse-ink);
  background: rgba(201, 164, 74, 0.13);
}

.jump-button:hover,
.utility-button:hover {
  border-color: var(--collapse-rule-strong);
  color: var(--collapse-ink);
  background: var(--collapse-surface-strong);
}

.jump-button:focus-visible,
.utility-button:focus-visible,
#generation-slider:focus-visible {
  outline: 2px solid var(--collapse-gold);
  outline-offset: 2px;
}

.utility-button {
  color: #101812;
  border-color: var(--collapse-gold);
  background: var(--collapse-gold);
}

.utility-button.is-active {
  color: var(--collapse-ink);
  border-color: rgba(169, 200, 163, 0.42);
  background: rgba(249, 251, 249, 0.08);
}

.control-label {
  margin: 0 0 10px;
}

.formula-card,
.rigor-note {
  margin: 0;
  padding: 15px 0 0;
  border-top: 1px solid var(--collapse-rule);
  color: var(--collapse-muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
}

.rigor-note a {
  color: var(--collapse-gold);
  text-decoration-color: rgba(201, 164, 74, 0.48);
  text-underline-offset: 3px;
}

.rigor-note a:hover {
  color: var(--collapse-sage);
}

.formula-card p {
  margin: 8px 0 0;
}

.formula-title {
  margin: 0;
}

.reading-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.reading-notes article {
  padding: 20px;
}

.reading-notes h2 {
  margin: 0 0 9px;
  font-size: clamp(1.25rem, 2vw, 1.75rem);
}

.reading-notes p {
  margin: 0;
  color: var(--collapse-muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.03rem;
}

@media (max-width: 1120px) {
  .stats-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .instrument-grid {
    grid-template-columns: 1fr;
  }

  .control-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .control-panel .panel-heading,
  .formula-card,
  .rigor-note {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .collapse-shell {
    width: calc(100vw - 44px);
    padding: 78px 0 48px;
  }

  h1 {
    font-size: clamp(2rem, 12vw, 2.72rem);
    overflow-wrap: break-word;
  }

  .lede {
    font-size: 1.08rem;
  }

  .stats-strip,
  .control-panel,
  .reading-notes {
    grid-template-columns: 1fr;
  }

  .canvas-panel,
  .control-panel {
    padding: 15px;
  }

  #collapse-canvas {
    height: 540px;
  }

  .canvas-desc {
    font-size: 0.84rem;
  }

  .slider-block label {
    display: grid;
    gap: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}