/* ===== chapters: content cards, badges, hero variants ===== */

.grad{background:linear-gradient(100deg,var(--cyan),#3b82f6 40%,var(--purple));-webkit-background-clip:text;background-clip:text;color:transparent}
.grad-green{background:linear-gradient(100deg,var(--green),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
em{font-style:normal;color:var(--cyan)}

#stage{position:fixed;inset:0;z-index:10;pointer-events:none}
.chapter{
  position:absolute;inset:0;display:flex;align-items:center;
  padding:0 clamp(20px,5vw,64px);
  opacity:0;visibility:hidden;transition:opacity .55s var(--ease),visibility .55s;
}
.chapter.on{opacity:1;visibility:visible}

.card{
  position:relative;max-width:660px;pointer-events:auto;
  background:var(--panel);border:1px solid var(--line);border-radius:22px;
  padding:36px 40px 32px;backdrop-filter:blur(18px);
  transform:translateY(18px);transition:transform .55s var(--ease);
  box-shadow:0 30px 80px rgba(0,0,0,.45);
  max-height:calc(100vh - 130px);overflow-y:auto;
}
.chapter.on .card{transform:none}
.card::before{content:"";position:absolute;top:0;left:24px;right:24px;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),transparent)}

.kick{font-size:12.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--cyan);font-weight:700;margin-bottom:14px}
.kick.green{color:var(--green)} .kick.purple{color:var(--purple)} .kick.amber{color:var(--amber)}
.card h2{font-size:clamp(27px,3.8vw,40px);line-height:1.12;letter-spacing:-.015em;font-weight:800;margin-bottom:14px}
.card p{font-size:15.5px;color:#c5cfe6;line-height:1.58;margin-bottom:11px}
.card ul{list-style:none;margin-top:7px;display:flex;flex-direction:column;gap:10px}
.card li{position:relative;padding-left:25px;font-size:14.5px;color:#c5cfe6;line-height:1.5}
.card li::before{content:"";position:absolute;left:2px;top:8px;width:12px;height:7px;
  border-left:2px solid var(--cyan);border-bottom:2px solid var(--cyan);transform:rotate(-45deg)}
.card li b{color:#fff}

/* source citation line (public-record chapters) */
.src{margin-top:15px;font-size:11.5px;letter-spacing:.04em;color:var(--muted);font-style:italic;
  border-top:1px solid var(--line);padding-top:11px}

.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px}
.badge{font-size:12px;font-weight:700;letter-spacing:.06em;padding:6px 14px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,255,255,.04);color:#cdd6ee}
.badge.c{color:var(--cyan);border-color:rgba(0,229,255,.4)}
.badge.g{color:var(--green);border-color:rgba(45,255,158,.4)}
.badge.p{color:#d9a7ff;border-color:rgba(177,76,255,.4)}
.badge.a{color:var(--amber);border-color:rgba(255,181,69,.4)}

/* centered hero variant (title + closing chapters) — text sits ABOVE the
   animation so the diorama below stays unobstructed */
.chapter.center{justify-content:center;align-items:flex-start;padding-top:92px;text-align:center}
.chapter.center .card{
  max-width:860px;background:transparent;border:none;backdrop-filter:none;box-shadow:none;padding:0;
}
.chapter.center .card::before{display:none}
.chapter.center h1{font-size:clamp(44px,7vw,84px);line-height:1.03;letter-spacing:-.02em;font-weight:800;margin:14px 0 20px}
.chapter.center .lead{font-size:clamp(15px,1.9vw,19px);color:#c5cfe6;max-width:720px;margin:0 auto 8px}

@media(max-width:700px){
  .card{max-width:92vw;padding:22px}
}

/* ---- driver HMI: the cab radio's big in-cab display (cab-radio chapter) ---- */
#hmi{
  position:fixed;right:26px;bottom:108px;width:440px;z-index:6;
  background:linear-gradient(160deg,rgba(10,16,30,.92),rgba(7,11,22,.88));
  border:1px solid rgba(0,229,255,.22);border-radius:18px;
  backdrop-filter:blur(14px);box-shadow:0 24px 60px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.03) inset;
  padding:18px 20px 16px;opacity:0;transform:translateY(16px) scale(.98);
  pointer-events:none;transition:opacity .5s ease,transform .5s ease;
}
#hmi.on{opacity:1;transform:none}
.hmi-head{display:flex;justify-content:space-between;align-items:baseline;border-bottom:1px solid rgba(255,255,255,.07);padding-bottom:10px}
.hmi-head b{font-size:15px;letter-spacing:.14em;color:#eaf2ff}
.hmi-head span{display:block;font-size:9.5px;letter-spacing:.22em;color:var(--muted);margin-top:2px}
.hmi-head em{font-style:normal;font-size:10px;letter-spacing:.14em;color:var(--green);border:1px solid rgba(45,255,158,.35);border-radius:99px;padding:3px 9px;background:rgba(45,255,158,.07);white-space:nowrap}
.hmi-main{display:flex;gap:18px;align-items:center;padding:14px 0 12px}
.hmi-speed{flex:none;text-align:center;min-width:108px}
.hmi-speed b{display:block;font-size:52px;font-weight:800;line-height:1;color:#fff;font-variant-numeric:tabular-nums}
.hmi-speed span{font-size:10px;letter-spacing:.24em;color:var(--muted)}
.hmi-bearers{flex:1;display:flex;flex-direction:column;gap:7px}
.hmi-bearer{display:flex;align-items:center;gap:9px;border:1px solid rgba(255,255,255,.07);border-radius:10px;padding:6px 10px;transition:border-color .3s,background .3s}
.hmi-bearer i{width:9px;height:9px;border-radius:50%;background:#2a3a5c;flex:none;transition:background .3s,box-shadow .3s}
.hmi-bearer b{font-size:11px;letter-spacing:.08em;color:#dbe6f8;flex:1}
.hmi-bearer span{font-size:9.5px;letter-spacing:.12em;color:var(--muted)}
.hmi-bearer.live{border-color:rgba(45,255,158,.45);background:rgba(45,255,158,.06)}
.hmi-bearer.live i{background:var(--green);box-shadow:0 0 10px var(--green)}
.hmi-bearer.live span{color:var(--green)}
.hmi-bearer.sat.live{border-color:rgba(177,76,255,.5);background:rgba(177,76,255,.07)}
.hmi-bearer.sat.live i{background:var(--purple);box-shadow:0 0 10px var(--purple)}
.hmi-bearer.sat.live span{color:#d9a7ff}
.hmi-row{display:flex;gap:10px;border-top:1px solid rgba(255,255,255,.07);padding-top:12px}
.hmi-cell{flex:1;min-width:0}
.hmi-cell label{display:block;font-size:9px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.hmi-cell b{display:block;font-size:12px;color:#eaf2ff;letter-spacing:.04em;white-space:nowrap}
.hmi-cell span{font-size:9.5px;color:var(--muted);letter-spacing:.08em}
.hmi-cell .ok{color:var(--green)}
#hmi-cam{color:var(--cyan)}
/* keep the display visible on smaller windows — shrink instead of hiding */
@media(max-width:1420px){
  #hmi{width:380px;padding:14px 16px 12px}
  .hmi-speed b{font-size:42px}
  .hmi-main{gap:12px;padding:11px 0 10px}
}
@media(max-width:1180px){
  #hmi{width:335px;right:14px;bottom:100px;padding:12px 14px 10px;border-radius:14px}
  .hmi-speed{min-width:86px}
  .hmi-speed b{font-size:34px}
  .hmi-bearer{padding:4px 8px}
  .hmi-head b{font-size:13px}
  .hmi-cell b{font-size:10.5px;white-space:normal}
}
@media(max-width:760px){#hmi{display:none}}

/* ---- site nav in the brand bar (back to frmcs.ai) ---- */
.bar-links{display:flex;gap:20px;pointer-events:auto}
.bar-links a{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);text-decoration:none;transition:color .25s}
.bar-links a:hover{color:var(--cyan)}
@media(max-width:1150px){.brand-co{display:none}}
@media(max-width:820px){.bar-links{gap:12px}.bar-links a{font-size:10px}}
@media(max-width:640px){.bar-links{display:none}}

/* ---- app tabs: every application clickable from every chapter ---- */
.nav-btns{align-items:center;max-width:94vw}
.app-tabs{display:flex;gap:6px;max-width:min(68vw,980px);overflow-x:auto;pointer-events:auto;padding:3px 2px;scrollbar-width:none}
.app-tabs::-webkit-scrollbar{display:none}
.app-tabs button{
  flex:none;width:auto;height:auto;font:inherit;font-size:10px;letter-spacing:.1em;font-weight:700;white-space:nowrap;
  color:var(--muted);background:rgba(255,255,255,.04);border:1px solid var(--line);
  border-radius:999px;padding:8px 13px;cursor:pointer;transition:color .25s,border-color .25s,background .25s;
}
.app-tabs button:hover{transform:none}
.app-tabs button:hover{color:#fff;border-color:rgba(0,229,255,.5)}
.app-tabs button.on{color:#061018;background:var(--cyan);border-color:var(--cyan);box-shadow:0 0 14px rgba(0,229,255,.5)}
@media(max-width:760px){.app-tabs{max-width:56vw}}