/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   foyl Concepts — cinematic learning shell

   Shared presentation layer for concept detail pages. The authored
   interactives remain page-owned; this layer supplies the visual story,
   chapter pacing, scan-friendly reading cards, and Three.js stage.
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

body.concept-story{
  --cx-accent:var(--accent,#22D3EE);
  --cx-panel:rgba(10,13,12,.78);
  --cx-line:color-mix(in srgb,var(--cx-accent) 26%,transparent);
  min-height:100%;
  background:
    radial-gradient(ellipse at 78% 6%,color-mix(in srgb,var(--cx-accent) 8%,transparent),transparent 34%),
    radial-gradient(ellipse at 8% 38%,rgba(0,174,239,.035),transparent 28%),
    var(--bg);
}
body.concept-story::before{
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.22;
  background-image:
    linear-gradient(rgba(100,168,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(100,168,255,.035) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:linear-gradient(to bottom,#000,transparent 75%);
}
.concept-story nav,.concept-story footer{position:relative;z-index:30}
.concept-story nav{position:sticky}

/* Hero / visual stage */
.cx-ready .concept-story .wrap{
  max-width:1180px;padding:0 34px;position:relative;z-index:2;
}
.cx-ready .concept-story .page-hdr{
  position:relative;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(350px,.95fr);
  align-items:center;gap:clamp(30px,5vw,72px);min-height:500px;
  margin:30px 0 58px;padding:clamp(34px,5vw,68px);
  border:1px solid var(--border2);border-radius:24px;overflow:hidden;
  background:
    linear-gradient(128deg,rgba(14,18,17,.96),rgba(5,8,7,.9) 57%,color-mix(in srgb,var(--cx-accent) 7%,rgba(2,4,3,.94))),
    var(--bg2);
  box-shadow:0 28px 80px rgba(0,0,0,.38),inset 0 1px rgba(255,255,255,.025);
  animation:none;border-bottom-color:var(--border2);
}
.cx-ready .concept-story .page-hdr::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(90deg,color-mix(in srgb,var(--cx-accent) 70%,transparent),transparent 34%) 0 0/100% 1px no-repeat,
    radial-gradient(circle at 74% 48%,color-mix(in srgb,var(--cx-accent) 10%,transparent),transparent 34%);
}
.cx-ready .concept-story .page-hdr::after{
  content:'CONCEPT FIELD';position:absolute;left:28px;bottom:18px;
  font-family:var(--mono);font-size:10px;letter-spacing:.28em;color:var(--tx4);
}
.cx-copy{position:relative;z-index:3;min-width:0}
.cx-ready .ph-crumb{margin-bottom:28px}
.cx-ready .ph-category{margin-bottom:14px}
.cx-ready .ph-title{
  max-width:700px;font-size:clamp(34px,4.3vw,58px);line-height:1.02;
  letter-spacing:-.045em;margin-bottom:20px;text-wrap:balance;
}
.cx-ready .ph-title .cx-word{display:inline-block;will-change:transform,opacity}
.cx-ready .ph-hook{
  max-width:670px;font-size:clamp(15px,1.4vw,18px);line-height:1.72;color:var(--tx2);margin-bottom:26px;
}
.cx-ready .ph-meta{gap:7px}
.cx-ready .ph-badge,.cx-ready .att-badge{
  backdrop-filter:blur(10px);background:color-mix(in srgb,var(--cx-accent) 7%,rgba(8,10,9,.58));
}

.cx-stage{
  position:relative;min-height:390px;border:1px solid var(--border2);border-radius:20px;overflow:hidden;
  background:
    radial-gradient(circle at 50% 44%,color-mix(in srgb,var(--cx-accent) 10%,transparent),transparent 46%),
    linear-gradient(145deg,rgba(0,0,0,.38),rgba(12,16,15,.68));
  box-shadow:inset 0 0 70px rgba(0,0,0,.52),0 22px 60px rgba(0,0,0,.3);
  isolation:isolate;cursor:crosshair;
}
.cx-stage::before{
  content:'';position:absolute;inset:0;z-index:1;pointer-events:none;opacity:.34;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:32px 32px;
  mask-image:radial-gradient(circle at center,#000,transparent 75%);
}
.cx-stage::after{
  content:'';position:absolute;inset:10px;border:1px solid rgba(255,255,255,.035);border-radius:14px;
  z-index:4;pointer-events:none;
}
.cx-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:0}
.cx-stage-top{
  position:absolute;left:18px;right:18px;top:16px;z-index:5;display:flex;align-items:center;justify-content:space-between;
  font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--tx4);pointer-events:none;
}
.cx-live{display:flex;align-items:center;gap:7px;color:var(--cx-accent)}
.cx-live::before{
  content:'';width:6px;height:6px;border-radius:50%;background:var(--cx-accent);
  box-shadow:0 0 14px var(--cx-accent);animation:cx-pulse 1.8s ease-in-out infinite;
}
.cx-stage-hud{
  position:absolute;left:18px;right:18px;bottom:16px;z-index:5;display:grid;grid-template-columns:1fr 1fr;gap:8px;
  pointer-events:none;
}
.cx-hud-cell{
  min-width:0;padding:10px 11px;border:1px solid var(--border);border-radius:9px;
  background:rgba(2,4,3,.7);backdrop-filter:blur(12px);
}
.cx-hud-label{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--tx4);margin-bottom:3px}
.cx-hud-value{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.05em;color:var(--tx2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cx-stage-fallback{
  display:none;position:absolute;inset:50% auto auto 50%;width:170px;height:170px;transform:translate(-50%,-50%);
  border:1px solid var(--cx-line);border-radius:50%;box-shadow:0 0 50px color-mix(in srgb,var(--cx-accent) 12%,transparent);
}
.cx-stage-fallback::before,.cx-stage-fallback::after{
  content:'';position:absolute;border:1px solid var(--cx-line);border-radius:50%;inset:22px;
}
.cx-stage-fallback::after{inset:50px;background:color-mix(in srgb,var(--cx-accent) 9%,transparent)}
.cx-no-webgl .cx-canvas{display:none}
.cx-no-webgl .cx-stage-fallback{display:block}
@keyframes cx-pulse{0%,100%{opacity:.45;transform:scale(.8)}50%{opacity:1;transform:scale(1.15)}}

.cx-scroll-cue{
  position:absolute;left:50%;bottom:13px;z-index:5;transform:translateX(-50%);display:flex;align-items:center;gap:8px;
  border:0;background:none;color:var(--tx4);font-family:var(--mono);font-size:10px;letter-spacing:.17em;text-transform:uppercase;
  cursor:pointer;transition:color .18s;
}
.cx-scroll-cue:hover{color:var(--tx2)}
.cx-scroll-cue::after{content:'↓';font-size:11px;color:var(--cx-accent);animation:cx-nudge 1.8s ease-in-out infinite}
@keyframes cx-nudge{0%,100%{transform:translateY(-2px)}50%{transform:translateY(3px)}}

/* The page-owned interactive becomes the first chapter, not an orphaned widget. */
.cx-lab{
  position:relative;margin:0 0 34px;padding:clamp(24px,3.6vw,42px);border:1px solid var(--border2);border-radius:20px;
  background:linear-gradient(145deg,rgba(14,17,16,.9),rgba(6,8,7,.78));
  box-shadow:0 22px 65px rgba(0,0,0,.24),inset 0 1px rgba(255,255,255,.02);overflow:hidden;
}
.cx-lab,.cx-ready .concept-story .c-section{scroll-margin-top:78px}
.cx-lab::before{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(90deg,var(--cx-accent),transparent 42%) 0 0/100% 1px no-repeat,
    radial-gradient(circle at 92% 3%,color-mix(in srgb,var(--cx-accent) 8%,transparent),transparent 28%);
}
.cx-lab-head{position:relative;display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:28px;padding-bottom:18px;border-bottom:1px solid var(--border)}
.cx-lab-kicker,.cx-chapter-kicker{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--cx-accent);margin-bottom:6px}
.cx-lab-title{margin:0;font-family:var(--jakarta);font-size:clamp(20px,2.2vw,28px);font-weight:650;letter-spacing:-.025em;line-height:1.2;color:var(--tx)}
.cx-lab-state{display:flex;align-items:center;gap:7px;white-space:nowrap;font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--tx4);padding-top:5px}
.cx-lab-state::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--cx-accent);box-shadow:0 0 10px var(--cx-accent)}
.cx-lab > :not(.cx-lab-head){position:relative;z-index:1}

/* Chapters become visual cards. Paragraphs become scan-sized evidence tiles. */
.cx-ready .concept-story .c-section{
  position:relative;margin:22px 0!important;padding:clamp(27px,4vw,46px)!important;
  border:1px solid var(--border2)!important;border-radius:20px;overflow:hidden;
  background:linear-gradient(145deg,rgba(13,16,15,.9),rgba(7,9,8,.76));
  box-shadow:0 18px 52px rgba(0,0,0,.2),inset 0 1px rgba(255,255,255,.018);
}
.cx-ready .concept-story .c-section::before{
  content:'';position:absolute;left:0;right:0;top:0;height:1px;opacity:.7;
  background:linear-gradient(90deg,var(--cx-accent),transparent 45%);
}
.cx-ready .concept-story .c-section::after{
  content:attr(data-cx-index);position:absolute;right:24px;top:17px;
  font-family:var(--mono);font-size:clamp(28px,5vw,62px);line-height:1;color:color-mix(in srgb,var(--cx-accent) 6%,transparent);
  pointer-events:none;
}
.cx-ready .concept-story .c-title{
  position:relative;z-index:2;max-width:780px;font-family:var(--jakarta);font-size:clamp(21px,2.5vw,31px);
  font-weight:650;letter-spacing:-.03em;line-height:1.2;color:var(--tx);margin-bottom:9px!important;text-wrap:balance;
}
.cx-ready .concept-story .c-sub{position:relative;z-index:2;max-width:700px;font-size:13px;color:var(--tx3);margin-bottom:24px!important}
.cx-ready .concept-story .c-body{
  position:relative;z-index:2;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:22px;
}
.cx-ready .concept-story .c-body > p{
  position:relative;margin:0!important;padding:20px 20px 20px 22px;border:1px solid var(--border);border-radius:12px;
  background:rgba(2,4,3,.34);color:var(--tx3);line-height:1.72;transition:border-color .2s,background .2s,transform .2s;
}
.cx-ready .concept-story .c-body > p::before{
  content:'';position:absolute;left:0;top:18px;bottom:18px;width:2px;border-radius:2px;
  background:linear-gradient(var(--cx-accent),transparent);opacity:.5;
}
.cx-ready .concept-story .c-body > p:hover{
  border-color:var(--border2);background:color-mix(in srgb,var(--cx-accent) 3%,rgba(2,4,3,.42));transform:translateY(-2px);
}
.cx-ready .concept-story .c-body > table,
.cx-ready .concept-story .c-body > .detection-table,
.cx-ready .concept-story .c-body > ul,
.cx-ready .concept-story .c-body > ol,
.cx-ready .concept-story .c-body > div:not(.cx-reading-card){grid-column:1/-1}
.cx-ready .concept-story .c-section > p{
  position:relative;z-index:2;max-width:780px;padding:18px 20px;margin:12px 0!important;border-left:2px solid var(--cx-line);
  background:rgba(2,4,3,.25);border-radius:0 10px 10px 0;color:var(--tx3);
}
.cx-ready .related-grid{position:relative;z-index:2;margin-top:22px}
.cx-ready .related-card{background:rgba(2,4,3,.38);border-color:var(--border2);transform-style:preserve-3d;will-change:transform}
.cx-ready .concept-story .will-reveal{opacity:1;transform:none;transition:none}

/* Persistent visual chapter rail on wide screens. */
.cx-rail{
  display:none;position:fixed;z-index:25;top:112px;right:max(18px,calc((100vw - 1490px)/2));width:128px;
  padding:13px 10px 13px 18px;border-left:1px solid var(--border2);
}
.cx-rail::before{
  content:'';position:absolute;left:-1px;top:13px;width:1px;height:var(--cx-progress,0%);background:var(--cx-accent);
  box-shadow:0 0 12px color-mix(in srgb,var(--cx-accent) 55%,transparent);transition:height .2s linear;
}
.cx-rail-label{font-family:var(--mono);font-size:10px;letter-spacing:.19em;text-transform:uppercase;color:var(--tx4);margin-bottom:10px}
.cx-rail-link{
  display:block;width:100%;border:0;background:none;text-align:left;padding:6px 0;color:var(--tx4);cursor:pointer;
  font-family:var(--mono);font-size:10px;line-height:1.35;letter-spacing:.06em;transition:color .18s,transform .18s;
}
.cx-rail-link:hover{color:var(--tx2)}
.cx-rail-link.active{color:var(--cx-accent);transform:translateX(3px)}
@media(min-width:1530px){.cx-rail{display:block}}

/* Motion-ready states are applied only after JS has built the shell. */
.cx-ready:not(.cx-static) .cx-lab,
.cx-ready:not(.cx-static) .c-section{will-change:transform,opacity}

/* Projector mode is a static, high-contrast classroom surface. */
[data-theme="projector"] body.concept-story::before{display:none}
[data-theme="projector"] .cx-ready .concept-story .page-hdr{
  grid-template-columns:1fr;min-height:0;background:var(--bg);box-shadow:none;border-color:var(--border2);
}
[data-theme="projector"] .cx-stage{display:none}
[data-theme="projector"] .cx-scroll-cue,[data-theme="projector"] .cx-rail{display:none}
[data-theme="projector"] .cx-lab,[data-theme="projector"] .cx-ready .concept-story .c-section{box-shadow:none;background:var(--bg2)}

@media(max-width:900px){
  .cx-ready .concept-story .wrap{padding:0 20px}
  .cx-ready .concept-story .page-hdr{grid-template-columns:1fr;gap:28px;min-height:0;padding:38px 28px 52px;border-radius:18px}
  .cx-stage{min-height:330px}
  .cx-scroll-cue{bottom:11px}
  .cx-ready .concept-story .c-body{grid-template-columns:1fr}
}
@media(max-width:560px){
  .cx-ready .concept-story .wrap{padding:0 12px}
  .cx-ready .concept-story .page-hdr{margin-top:14px;padding:30px 20px 48px;border-radius:15px}
  .cx-ready .ph-crumb{margin-bottom:19px}.cx-ready .ph-title{font-size:32px}
  .cx-stage{min-height:285px;border-radius:14px}.cx-stage-hud{grid-template-columns:1fr}.cx-hud-cell:last-child{display:none}
  .cx-lab{padding:23px 17px;border-radius:15px}.cx-lab-head{display:block}.cx-lab-state{margin-top:10px}
  .cx-ready .concept-story .c-section{padding:26px 18px!important;border-radius:15px}
  .cx-ready .concept-story .c-body > p{padding:17px 16px 17px 19px}
}

@media(prefers-reduced-motion:reduce){
  .cx-live::before,.cx-scroll-cue::after{animation:none}
  .cx-stage{cursor:default}.cx-canvas{display:none}.cx-stage-fallback{display:block}
  .cx-ready .concept-story .c-body > p,.cx-rail-link{transition:none}
  .cx-ready .concept-story .c-body > p:hover{transform:none}
}

@supports not (color:color-mix(in srgb,#fff,#000)){
  body.concept-story{--cx-line:rgba(34,211,238,.22)}
  .cx-ready .ph-badge,.cx-ready .att-badge{background:rgba(34,211,238,.06)}
  .cx-ready .concept-story .c-section::after{color:rgba(34,211,238,.05)}
}