/* ============================================================
   Mechanical Failure & Resilience Lab — interactive portfolio
   Dark technical "evidence console" theme. No build step.
   ============================================================ */

:root {
  --bg: #060d13;
  --bg-2: #08131c;
  --panel: rgba(9, 21, 31, 0.62);
  --panel-solid: #0a1620;
  --line: rgba(126, 167, 197, 0.18);
  --line-strong: rgba(126, 167, 197, 0.34);
  --ink: #e8edf2;
  --ink-dim: #9fb3c3;
  --ink-faint: #6f8497;
  --accent: #1d83ff;
  --accent-2: #36d8c5;
  --warn: #ff5b36;
  --good: #36d8c5;
  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace, monospace;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  color-scheme: dark;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }

html, body { margin: 0; }
body {
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(900px 480px at 70% -10%, rgba(29, 131, 255, 0.10), transparent 60%),
    radial-gradient(700px 500px at 0% 0%, rgba(54, 216, 197, 0.06), transparent 55%),
    linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 60%);
}

button { font: inherit; color: inherit; }
a { color: inherit; }
h1, h2, h3, p, dl, dd, figure, blockquote { margin: 0; }
img { display: block; max-width: 100%; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: rgba(126, 167, 197, 0.22); border-radius: 10px; }
::-webkit-scrollbar-track { background: transparent; }

.eyebrow {
  color: var(--ink-faint);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ---------------- Top bar ---------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  height: 60px;
  padding: 0 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(6, 13, 19, 0.78);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border: 1px solid rgba(120, 199, 255, 0.42);
  border-radius: 9px;
  color: #8fc6ff;
  background: linear-gradient(160deg, rgba(29, 131, 255, 0.22), rgba(29, 131, 255, 0.04));
}
.brand-copy h1 {
  font-size: 14px;
  font-weight: 750;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: #f3f8fc;
}
.brand-copy span {
  display: block;
  margin-top: 2px;
  color: var(--ink-faint);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
}
.topnav a, .topnav button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 34px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink-dim);
  background: transparent;
  text-decoration: none;
  cursor: pointer;
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}
.topnav a:hover, .topnav button:hover {
  color: #f4fbff;
  border-color: var(--line-strong);
  background: rgba(24, 49, 67, 0.5);
}
.topnav .icon { color: var(--accent-2); }

.icon { display: inline-flex; flex: none; }
.icon svg { display: block; }

/* ---------------- Workbench grid ---------------- */
.workbench {
  display: grid;
  grid-template-columns: 256px minmax(0, 1fr) 340px;
  align-items: stretch;
  gap: 0;
  min-height: calc(100vh - 60px);
}

.module-rail, .evidence-console {
  padding: 18px 16px;
  background: rgba(6, 13, 20, 0.55);
}
.module-rail { border-right: 1px solid var(--line); }
.evidence-console { border-left: 1px solid var(--line); }
.model-stage { align-self: stretch; }

.rail-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

/* ---------------- Module rail (project switcher) ---------------- */
.module-list { display: grid; gap: 10px; }
.module-card {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas: "idx title" "thumb thumb" "state state";
  gap: 4px 10px;
  width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-left: 2px solid rgba(126, 167, 197, 0.2);
  border-radius: 10px;
  color: #d9e7f2;
  text-align: left;
  background: var(--panel);
  cursor: pointer;
  transition: border-color 150ms ease, background 150ms ease, transform 150ms ease;
}
.module-card:hover { transform: translateY(-1px); }
.module-card:hover, .module-card.active {
  border-color: color-mix(in srgb, var(--accent), transparent 30%);
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent), #06101a 88%);
}
.module-card .m-index { grid-area: idx; color: var(--accent); font-size: 12px; font-weight: 800; font-family: var(--mono); }
.module-card .m-title { grid-area: title; align-self: center; font-size: 14px; font-weight: 720; letter-spacing: 0.01em; text-transform: uppercase; }
.module-card .m-thumb {
  grid-area: thumb;
  height: 76px;
  margin-top: 6px;
  border: 1px solid rgba(126, 167, 197, 0.12);
  border-radius: 7px;
  overflow: hidden;
  background: #050b11;
}
.module-card .m-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: 0.92; }
.module-card .m-state {
  grid-area: state;
  margin-top: 7px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.module-card .m-state::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* ethos quote */
.lab-quote {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent-2);
  border-radius: 10px;
  color: #c1ced8;
  font-size: 12.5px;
  line-height: 1.55;
  background: var(--panel);
}
.lab-quote b { color: #eaf2f8; font-weight: 650; }

/* ---------------- Center stage ---------------- */
.model-stage {
  min-width: 0;
  padding: 22px 24px 32px;
  background:
    linear-gradient(rgba(120, 199, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 199, 255, 0.035) 1px, transparent 1px),
    transparent;
  background-size: 40px 40px;
}

.stage-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.stage-header .eyebrow { margin-bottom: 8px; }
.stage-title { font-size: 20px; font-weight: 680; letter-spacing: -0.01em; color: #eaf3fa; line-height: 1.25; }
.stage-lede { margin-top: 8px; max-width: 62ch; color: var(--ink-dim); font-size: 13px; line-height: 1.55; }
.stage-head-main { min-width: 0; }
.spec-strip { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 13px; }
.spec-chip {
  display: inline-flex; align-items: center;
  height: 25px; padding: 0 10px;
  border: 1px solid var(--line); border-radius: 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.01em;
  color: var(--ink-dim); background: rgba(5, 11, 16, 0.4);
}

.risk-pill {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-dim);
  background: var(--panel);
}
.risk-pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-dim); }
.risk-pill[data-risk="High"] { color: #ff8a6b; } .risk-pill[data-risk="High"] .dot { background: var(--warn); box-shadow: 0 0 8px var(--warn); }
.risk-pill[data-risk="Medium"] { color: #ffce6b; } .risk-pill[data-risk="Medium"] .dot { background: #f6a623; box-shadow: 0 0 8px #f6a623; }
.risk-pill[data-risk="Low"] { color: #7ce6cf; } .risk-pill[data-risk="Low"] .dot { background: var(--good); box-shadow: 0 0 8px var(--good); }

/* variant tabs */
.variant-tabs { display: grid; gap: 10px; margin-top: 18px; grid-auto-flow: column; grid-auto-columns: 1fr; }
.variant-tab {
  display: grid;
  gap: 3px;
  min-height: 60px;
  padding: 11px 14px;
  border: 1px solid color-mix(in srgb, var(--variant, #8eaabd), transparent 55%);
  border-radius: 10px;
  color: var(--ink-dim);
  text-align: left;
  background: var(--panel);
  cursor: pointer;
  transition: border-color 150ms ease, background 150ms ease, transform 150ms ease;
}
.variant-tab:hover { transform: translateY(-1px); }
.variant-tab .vt-name { font-size: 14px; font-weight: 760; letter-spacing: 0.01em; text-transform: uppercase; color: color-mix(in srgb, var(--variant, #cfe0ec), white 8%); }
.variant-tab .vt-sub { font-size: 11.5px; color: var(--ink-faint); }
.variant-tab.active {
  color: var(--ink);
  border-color: var(--variant, var(--accent));
  background: color-mix(in srgb, var(--variant, var(--accent)), #06101a 84%);
  box-shadow: inset 0 -2px 0 var(--variant, var(--accent));
}

/* ---------------- Viewer ---------------- */
.viewer-shell {
  position: relative;
  height: clamp(420px, 56vh, 600px);
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(44, 165, 210, 0.12), transparent 55%),
    #060d13;
}
.viewer-canvas { position: absolute; inset: 0; }
.viewer-canvas canvas { display: block; width: 100% !important; height: 100% !important; }

.viewer-loading {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  color: var(--ink-dim);
  background: rgba(6, 13, 19, 0.7);
  font-size: 13px;
  z-index: 4;
}
.viewer-loading .spinner {
  width: 26px; height: 26px;
  border: 2px solid rgba(143, 198, 255, 0.25);
  border-top-color: #8fc6ff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.viewer-loading.error { color: #ff9b80; }
@keyframes spin { to { transform: rotate(360deg); } }

.viewer-hint {
  position: absolute;
  top: 12px; left: 14px;
  display: flex; gap: 12px; flex-wrap: wrap;
  color: var(--ink-faint);
  font-size: 10.5px;
  font-family: var(--mono);
  letter-spacing: 0.02em;
  pointer-events: none;
  z-index: 3;
}
.viewer-hint b { color: var(--ink-dim); font-weight: 600; }

.axis-badge {
  position: absolute;
  top: 12px; right: 14px;
  display: flex; gap: 8px;
  font-family: var(--mono); font-size: 11px; font-weight: 700;
  pointer-events: none; z-index: 3;
}
.axis-badge .ax { opacity: 0.9; }
.axis-badge .x { color: #ff6b4a; }
.axis-badge .y { color: #5fe07f; }
.axis-badge .z { color: #4f9bff; }

.viewer-toolbar {
  position: absolute;
  left: 50%; bottom: 14px;
  transform: translateX(-50%);
  display: flex;
  gap: 2px;
  padding: 5px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: rgba(6, 13, 19, 0.82);
  backdrop-filter: blur(12px);
  z-index: 5;
}
.tool-button {
  display: grid;
  place-items: center;
  gap: 3px;
  width: 62px;
  padding: 8px 4px 6px;
  border: 0;
  border-radius: 8px;
  color: var(--ink-dim);
  background: transparent;
  cursor: pointer;
  transition: color 130ms ease, background 130ms ease;
}
.tool-button span { font-size: 10px; letter-spacing: 0.02em; }
.tool-button:hover { color: #f4fbff; background: rgba(36, 64, 86, 0.6); }
.tool-button.active { color: #eaf7ff; background: rgba(29, 131, 255, 0.22); }
.tool-button.active .icon { color: #8fc6ff; }

/* layer strip */
.layer-strip { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; align-items: center; }
.layer-label { color: var(--ink-faint); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; margin-right: 2px; }
.layer-chip {
  display: inline-flex; align-items: center; gap: 7px;
  height: 32px; padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-dim);
  background: var(--panel);
  cursor: pointer;
  transition: color 140ms ease, border-color 140ms ease, background 140ms ease;
}
.layer-chip:hover { color: #eaf2f8; border-color: var(--line-strong); }
.layer-chip.active { color: #eafffb; border-color: rgba(54, 216, 197, 0.6); background: rgba(54, 216, 197, 0.12); }
.layer-chip.active .icon { color: var(--good); }

/* ---------------- Evidence console ---------------- */
.evidence-console { display: flex; flex-direction: column; gap: 10px; }
.evidence-console .rail-heading { margin-bottom: 4px; }

.panel {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  overflow: hidden;
}
.panel-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  width: 100%;
  min-height: 46px;
  padding: 0 13px;
  border: 0;
  color: #dbe7f0;
  text-align: left;
  background: rgba(7, 16, 23, 0.5);
  cursor: pointer;
}
.panel-header:hover { background: rgba(13, 28, 39, 0.6); }
.panel-header .ph-title { display: inline-flex; align-items: center; gap: 9px; font-size: 12.5px; font-weight: 720; letter-spacing: 0.02em; text-transform: uppercase; }
.panel-header .ph-title .icon { color: var(--accent-2); }
.panel-header .ph-right { display: inline-flex; align-items: center; gap: 8px; }
.panel-header .ph-status { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--good); }
.panel-header .ph-status[data-tone="plan"] { color: var(--ink-faint); }
.panel-header .ph-status[data-tone="warn"] { color: #f6a623; }
.panel-header .ph-status[data-tone="risk"] { color: var(--warn); }
.panel-header .chev { transition: transform 180ms ease; color: var(--ink-faint); }
.panel.collapsed .chev { transform: rotate(-90deg); }
.panel.collapsed .panel-body { display: none; }

.panel-body { padding: 13px; color: var(--ink-dim); font-size: 12.5px; line-height: 1.55; }
.panel-body > p { margin: 0 0 9px; }
.panel-body > p:last-child { margin-bottom: 0; }
.panel-body .muted { color: var(--ink-faint); font-size: 11.5px; }

.formula-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 10px; font-family: var(--mono); }
.formula-row span { padding: 9px 6px; border: 1px solid var(--line); border-radius: 7px; text-align: center; font-size: 12px; color: #dbe9f3; background: rgba(5, 11, 16, 0.55); }

.data-table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 12px; }
.data-table th, .data-table td { padding: 6px 8px; border-bottom: 1px solid var(--line); text-align: right; }
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.data-table thead th { color: var(--ink-faint); font-weight: 600; letter-spacing: 0.04em; }
.data-table tbody th { color: var(--ink-dim); font-weight: 600; }
.data-table td.num { color: #5fb0ff; }
.data-table tr:last-child td, .data-table tr:last-child th { border-bottom: 0; }

.risk-list { display: grid; gap: 7px; }
.risk-item { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; align-items: center; }
.risk-item .ri-mode { font-size: 12.5px; color: #d6e3ee; }
.risk-item .ri-cause { grid-column: 1 / -1; font-size: 11px; color: var(--ink-faint); }
.risk-item .ri-rpn { font-family: var(--mono); font-weight: 700; font-size: 13px; }
.risk-item .ri-rpn[data-sev="hi"] { color: var(--warn); }
.risk-item .ri-rpn[data-sev="md"] { color: #f6a623; }
.risk-item .ri-rpn[data-sev="lo"] { color: var(--good); }
.risk-item + .risk-item { border-top: 1px solid var(--line); padding-top: 7px; }

.callout {
  display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: center;
  padding: 12px; border: 1px solid var(--line); border-radius: 9px;
  background: rgba(5, 11, 16, 0.4);
}
.callout .badge {
  display: grid; place-items: center; width: 54px; height: 54px;
  border: 1px solid rgba(255, 91, 54, 0.3); border-radius: 9px;
  color: var(--warn);
  background: radial-gradient(circle, rgba(255, 75, 40, 0.3), rgba(29, 131, 255, 0.05) 60%, transparent 75%);
}

.spec-list { display: grid; gap: 6px; }
.spec-list .row { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; border-bottom: 1px solid var(--line); }
.spec-list .row:last-child { border-bottom: 0; }
.spec-list dt { color: var(--ink-faint); font-size: 11.5px; }
.spec-list dd { font-family: var(--mono); font-size: 12px; color: #d6e3ee; text-align: right; }

.bullet-list { display: grid; gap: 7px; padding-left: 0; list-style: none; }
.bullet-list li { position: relative; padding-left: 18px; font-size: 12.5px; line-height: 1.5; }
.bullet-list li::before { content: ""; position: absolute; left: 2px; top: 8px; width: 6px; height: 6px; border-radius: 1px; background: var(--accent-2); transform: rotate(45deg); }

.note-banner {
  display: flex; gap: 9px; align-items: flex-start;
  padding: 10px 12px; border: 1px solid rgba(246, 166, 35, 0.32); border-radius: 9px;
  background: rgba(246, 166, 35, 0.07); color: #f3d9a6; font-size: 12px; line-height: 1.5;
}
.note-banner .icon { color: #f6a623; margin-top: 1px; }

/* downloads */
.download-list { display: grid; gap: 8px; }
.download-row {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 9px;
  color: #d6e3ee; text-decoration: none;
  background: rgba(5, 11, 16, 0.4);
  transition: border-color 140ms ease, background 140ms ease, transform 140ms ease;
}
.download-row:hover { border-color: var(--accent); background: rgba(29, 131, 255, 0.08); transform: translateY(-1px); }
.download-row .icon { color: var(--accent-2); flex: none; }
.download-row .dl-main { flex: 1; min-width: 0; }
.download-row .dl-name { font-size: 12.5px; font-weight: 600; }
.download-row .dl-meta { font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint); }
.download-row .dl-go { color: var(--ink-faint); flex: none; }

/* ---------------- About ---------------- */
.about {
  padding: 40px 24px 64px;
  border-top: 1px solid var(--line);
  background: rgba(6, 13, 20, 0.4);
}
.about-inner { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; }
.about h2 { font-size: 22px; font-weight: 680; letter-spacing: -0.01em; color: #eaf3fa; margin-bottom: 14px; }
.about p { color: var(--ink-dim); font-size: 14px; line-height: 1.65; margin-bottom: 12px; max-width: 60ch; }
.about .demonstrates { display: grid; gap: 10px; align-content: start; }
.about .demonstrates h3 { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 4px; }
.about .demo-item {
  display: grid; grid-template-columns: auto 1fr; gap: 11px; align-items: start;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
}
.about .demo-item .icon { color: var(--accent-2); margin-top: 1px; }
.about .demo-item b { color: #e7f1f8; font-weight: 650; font-size: 13px; }
.about .demo-item span { display: block; color: var(--ink-faint); font-size: 12px; margin-top: 2px; }

.site-footer {
  padding: 22px 24px 40px;
  border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; justify-content: space-between;
  color: var(--ink-faint); font-size: 12px;
}
.site-footer .mono { font-family: var(--mono); }

/* ---------------- Responsive ---------------- */
@media (max-width: 1200px) {
  .workbench { grid-template-columns: 230px minmax(0, 1fr); }
  .module-rail { position: static; }
  .evidence-console { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--line); }
}
@media (max-width: 820px) {
  .topbar { grid-template-columns: 1fr auto; height: auto; padding: 12px 14px; gap: 10px; }
  .topnav { width: 100%; grid-column: 1 / -1; overflow-x: auto; justify-content: flex-start; }
  .workbench { grid-template-columns: 1fr; }
  .module-rail { border-right: 0; border-bottom: 1px solid var(--line); }
  .model-stage { padding: 18px 14px 26px; }
  .variant-tabs { grid-auto-flow: row; grid-template-columns: 1fr; grid-auto-columns: auto; }
  .about-inner { grid-template-columns: 1fr; gap: 24px; }
  .stage-header { flex-direction: column; }
}
@media (max-width: 480px) {
  .tool-button { width: 54px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ============================================================
   Storytelling walkthrough — scroll-driven layout (added)
   ============================================================ */

/* scroll progress (pure CSS scroll-timeline; degrades to hidden) */
.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 40;
  transform-origin: 0 50%; transform: scaleX(0);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  animation: sp-grow linear both;
  animation-timeline: scroll(root block);
}
@keyframes sp-grow { to { transform: scaleX(1); } }

/* ---- Hero ---- */
.hero-intro {
  position: relative; overflow: hidden;
  min-height: calc(100vh - 60px);
  display: grid; align-items: center;
  padding: clamp(40px, 8vh, 110px) clamp(20px, 6vw, 92px);
}
.hero-grid {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(900px 520px at 80% 8%, rgba(29,131,255,.16), transparent 60%),
    radial-gradient(720px 480px at 4% 94%, rgba(54,216,197,.09), transparent 55%),
    linear-gradient(rgba(120,199,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,199,255,.045) 1px, transparent 1px);
  background-size: auto, auto, 46px 46px, 46px 46px;
  -webkit-mask-image: radial-gradient(130% 100% at 62% 26%, #000 32%, transparent 82%);
  mask-image: radial-gradient(130% 100% at 62% 26%, #000 32%, transparent 82%);
}
.hero-inner { position: relative; max-width: 880px; }
.hero-title {
  margin: 14px 0 0; font-weight: 720; letter-spacing: -0.022em; line-height: 1.02;
  font-size: clamp(38px, 6.6vw, 78px); color: #eef6fc;
}
.hero-em {
  color: transparent; background: linear-gradient(92deg, #58b6ff, #36d8c5);
  -webkit-background-clip: text; background-clip: text;
}
.hero-lede { margin-top: 22px; max-width: 62ch; color: var(--ink-dim); font-size: clamp(15px, 1.55vw, 18px); line-height: 1.62; }
.hero-sub { margin-top: 13px; max-width: 56ch; color: var(--ink-faint); font-size: 13.5px; line-height: 1.55; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.scroll-cue {
  display: inline-flex; align-items: center; gap: 9px; margin-top: 30px;
  height: 44px; padding: 0 20px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-strong); color: #eaf3fa;
  background: linear-gradient(160deg, rgba(29,131,255,.22), rgba(29,131,255,.05));
  font-weight: 600; letter-spacing: 0.01em;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.scroll-cue:hover { transform: translateY(-1px); border-color: var(--accent); }
.scroll-cue svg { animation: cue-bob 1.8s ease-in-out infinite; }
@keyframes cue-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(3px); } }

/* ---- Scrolly grid ---- */
.scrolly {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(24px, 5vw, 78px);
  max-width: 1260px; margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 60px);
  align-items: start;
}
.scrolly-steps { padding: 12vh 0; }

.scene {
  min-height: 66vh; display: flex; align-items: center;
  opacity: .34; filter: saturate(.7);
  transition: opacity .5s ease, filter .5s ease;
}
.scene.is-active { opacity: 1; filter: none; }
.scene-inner {
  width: 100%;
  padding: 22px 24px 22px 28px;
  border-left: 2px solid var(--line);
  transition: border-color .4s ease;
}
.scene.is-active .scene-inner { border-left-color: var(--accent, #1d83ff); }
.scene-eyebrow {
  display: inline-block; font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent, #1d83ff); margin-bottom: 10px;
}
.scene-title { font-size: clamp(22px, 2.6vw, 31px); font-weight: 700; letter-spacing: -0.01em; color: #eef6fc; line-height: 1.16; }
.scene-story { margin-top: 12px; color: var(--ink-dim); font-size: 15px; line-height: 1.66; }
.scene-story p { margin: 0 0 10px; }
.scene-story p:last-child { margin-bottom: 0; }
.scene-story b { color: #dbeafc; font-weight: 650; }
.scene-story i { color: #cfe0ee; font-style: italic; }
.scene-evidence { margin-top: 18px; display: grid; gap: 10px; }

/* ---- Sticky 3D stage ---- */
.scrolly-stage { position: sticky; top: 76px; height: calc(100vh - 96px); align-self: start; }
.stage-inner { display: flex; flex-direction: column; height: 100%; gap: 12px; }
.stage-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 34px; }
.stage-top-main { display: grid; gap: 3px; min-width: 0; }
.stage-top-eyebrow { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-faint); }
.stage-top-model { font-size: 15px; font-weight: 720; color: #eaf3fa; }
.scrolly-stage .viewer-shell { height: auto; flex: 1 1 auto; min-height: 0; margin-top: 0; }
.stage-controls { display: grid; gap: 10px; }
.stage-controls .variant-tabs, .stage-controls .layer-strip { margin-top: 0; }

/* ---- Closing ---- */
.closing { padding: clamp(52px, 9vh, 110px) clamp(20px, 6vw, 60px) 44px; border-top: 1px solid var(--line); background: rgba(6,13,20,.4); }
.closing-inner { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(28px, 4vw, 52px); align-items: start; }
.closing-lead h2 { font-size: clamp(24px, 3vw, 34px); font-weight: 700; letter-spacing: -0.01em; color: #eef6fc; margin: 12px 0 16px; line-height: 1.18; }
.closing-lead p { color: var(--ink-dim); font-size: 14.5px; line-height: 1.66; margin-bottom: 12px; max-width: 58ch; }
.closing-note { color: var(--ink-faint) !important; font-size: 12.5px !important; }
.demonstrates { display: grid; gap: 10px; align-content: start; }
.demonstrates .demo-item {
  display: grid; grid-template-columns: auto 1fr; gap: 11px; align-items: start;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
}
.demonstrates .demo-item .icon { color: var(--accent-2); margin-top: 1px; }
.demonstrates .demo-item b { color: #e7f1f8; font-weight: 650; font-size: 13px; }
.demonstrates .demo-item span { display: block; color: var(--ink-faint); font-size: 12px; margin-top: 2px; }

.site-footer .footer-mid { flex: 1 1 auto; text-align: center; color: var(--ink-faint); }
.footer-back { color: var(--accent-2); text-decoration: none; }
.footer-back:hover { color: #eaf7ff; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .scrolly { grid-template-columns: 1fr; gap: 0; }
  .scrolly-stage { order: -1; position: sticky; top: 54px; height: 47vh; margin-bottom: 10px; }
  .scrolly-steps { padding: 3vh 0 8vh; }
  .scene { min-height: auto; padding: 6vh 0; }
  .scene { opacity: .55; }
  .scene.is-active { opacity: 1; }
  .stage-controls .layer-strip { display: none; }
  .closing-inner { grid-template-columns: 1fr; gap: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .scene { opacity: 1 !important; transform: none !important; filter: none !important; }
  .scroll-cue svg, .scroll-progress { animation: none; }
}