/* BitWithBite — Interview Prep shared stylesheet. Used by the hub + every role page. */
:root{
  --ink:#05091a;--ink2:#0a1230;--ink3:#101c3d;
  --glass:rgba(255,255,255,.03);--rim:rgba(255,255,255,.08);--rim2:rgba(255,255,255,.15);
  --txt:#eef3ff;--txt2:#8ca8d8;--txt3:#4a68a0;--txt4:#1e3260;
  --acc:#fbbf24;--acc2:#fde68a;--acc3:#d97706;
  --blue:#4f9eff;--green:#4ade80;--red:#f87171;--purple:#a78bfa;--teal:#2de8c0;
  --grd-acc:linear-gradient(135deg,#fbbf24,#d97706);
  --sh1:0 4px 20px rgba(0,0,0,.3);--sh2:0 8px 40px rgba(0,0,0,.5);
  --r:12px;--rfull:9999px;
  --ff-d:'Syne',sans-serif;--ff-b:'DM Sans',sans-serif;--ff-m:'JetBrains Mono',monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--ink);color:var(--txt);font-family:var(--ff-b);min-height:100vh;overflow-x:hidden;line-height:1.65}
a{text-decoration:none;color:inherit}button{font-family:var(--ff-b);cursor:pointer}
.bg-mesh{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse 90% 60% at 50% -10%,rgba(251,191,36,.10) 0%,transparent 55%),
             radial-gradient(ellipse 50% 50% at 100% 85%,rgba(217,119,6,.07) 0%,transparent 50%),
             radial-gradient(ellipse 40% 40% at 0% 90%,rgba(79,158,255,.06) 0%,transparent 50%)}
.bg-grid{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.018;
  background-image:linear-gradient(rgba(251,191,36,.6) 1px,transparent 1px),linear-gradient(90deg,rgba(251,191,36,.6) 1px,transparent 1px);
  background-size:60px 60px}
.page{position:relative;z-index:1}

/* NAV (matches courses-hub.html) */
nav{position:sticky;top:0;z-index:600;display:flex;align-items:center;justify-content:space-between;
  padding:.85rem 2.5rem;background:rgba(5,9,26,.92);backdrop-filter:blur(28px) saturate(160%);border-bottom:1px solid var(--rim)}
.nav-logo{display:flex;align-items:center;gap:12px;cursor:pointer}
.flying-logo-wrap{width:auto;height:auto;display:flex;align-items:center;flex-shrink:0}
.flying-logo{width:44px;height:32px;object-fit:contain;filter:drop-shadow(0 5px 12px rgba(251,191,36,.35))}
.nav-name{font-family:var(--ff-d);font-weight:800;font-size:1rem}
.nav-sub{font-size:.58rem;color:var(--txt4);letter-spacing:.03em}
.nav-right{display:flex;align-items:center;gap:10px}
.btn-back{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--rfull);border:1px solid var(--rim2);color:var(--txt2);text-decoration:none;font-size:.85rem;transition:.2s;background:none}
.btn-back:hover{border-color:var(--acc);color:var(--acc2)}

/* HERO (hub + role pages) */
.hero{padding:4.5rem 2.5rem 3rem;max-width:1100px;margin:0 auto;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:5px 16px;border-radius:var(--rfull);border:1px solid rgba(251,191,36,.3);background:rgba(251,191,36,.08);font-size:.75rem;font-weight:600;color:var(--acc2);margin-bottom:1.4rem;letter-spacing:.03em}
.ldot{width:6px;height:6px;border-radius:50%;background:var(--acc);animation:lp 1.8s infinite;flex-shrink:0}
@keyframes lp{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.3;transform:scale(.6)}}
.hero h1{font-family:var(--ff-d);font-size:clamp(2.1rem,4.6vw,3.4rem);font-weight:800;line-height:1.08;margin-bottom:1rem;letter-spacing:-.02em}
.hero h1 em{font-style:normal;background:var(--grd-acc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1rem;color:var(--txt2);max-width:640px;margin:0 auto 1.6rem;line-height:1.75}
.hero-stats{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}
.hstat{background:var(--glass);border:1px solid var(--rim);border-radius:var(--r);padding:.6rem 1.1rem;font-size:.78rem;color:var(--txt2);display:flex;align-items:center;gap:6px}
.hstat b{font-family:var(--ff-d);color:var(--txt)}

/* HUB ROLE GRID */
.role-grid{max-width:1100px;margin:0 auto;padding:0 2.5rem 5rem;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.role-card{background:var(--ink2);border:1px solid var(--rim);border-radius:18px;overflow:hidden;transition:all .24s;display:block}
.role-card:hover{border-color:var(--rim2);transform:translateY(-5px);box-shadow:0 20px 50px rgba(0,0,0,.6)}
.rc-top{height:96px;display:flex;align-items:center;justify-content:center;font-size:2.6rem;position:relative}
.rc-top::after{content:'';position:absolute;inset:0;background:linear-gradient(to bottom,transparent 30%,var(--ink2))}
.rc-body{padding:1.1rem 1.3rem 1.4rem}
.rc-cat{font-size:.6rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--txt4);margin-bottom:.4rem}
.rc-title{font-family:var(--ff-d);font-size:1.05rem;font-weight:800;margin-bottom:.5rem;letter-spacing:-.01em}
.rc-desc{font-size:.82rem;color:var(--txt2);line-height:1.6;margin-bottom:.9rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rc-meta{display:flex;gap:10px;font-size:.72rem;color:var(--txt3);align-items:center}
.rc-cta{margin-top:.9rem;padding:.6rem;border-radius:10px;background:var(--grd-acc);color:#1a1200;text-align:center;font-family:var(--ff-d);font-weight:700;font-size:.8rem}

/* ROLE PAGE: filter bar */
.filter-wrap{max-width:1000px;margin:0 auto;padding:0 2.5rem 1.5rem;position:sticky;top:64px;z-index:50;background:var(--ink);padding-top:1rem}
.srch-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:.8rem}
.srch-box{flex:1;min-width:220px;position:relative}
.srch-box input{width:100%;padding:.7rem 1rem .7rem 2.6rem;background:var(--ink2);border:1.5px solid var(--rim);border-radius:12px;color:var(--txt);font-family:var(--ff-b);font-size:.86rem;outline:none;transition:.2s}
.srch-box input:focus{border-color:var(--acc)}
.srch-ic{position:absolute;left:.8rem;top:50%;transform:translateY(-50%);color:var(--txt4);pointer-events:none;font-size:.9rem}
.q-count{font-size:.8rem;color:var(--txt3);display:flex;align-items:center;white-space:nowrap;padding:0 .3rem}
.chip-row{display:flex;gap:7px;flex-wrap:wrap}
.chip{padding:6px 14px;border-radius:var(--rfull);font-size:.75rem;font-weight:600;border:1px solid var(--rim);background:var(--glass);color:var(--txt3);cursor:pointer;transition:.16s;white-space:nowrap}
.chip:hover{border-color:var(--rim2);color:var(--txt2)}
.chip.on{border-color:transparent;color:#1a1200;background:var(--grd-acc)}
.chip.on.diff-intermediate{background:linear-gradient(135deg,#4f9eff,#1a78ff);color:#fff}
.chip.on.diff-advanced{background:linear-gradient(135deg,#f87171,#dc2626);color:#fff}
.chip.on.diff-beginner{background:linear-gradient(135deg,#4ade80,#16a34a);color:#04140d}

/* QUESTION LIST */
.q-list{max-width:1000px;margin:0 auto;padding:1rem 2.5rem 5rem;display:flex;flex-direction:column;gap:12px}
.q-card{background:var(--ink2);border:1px solid var(--rim);border-radius:14px;overflow:hidden;transition:border-color .2s}
.q-card:hover{border-color:var(--rim2)}
.q-head{display:flex;align-items:flex-start;gap:12px;padding:1.1rem 1.3rem;cursor:pointer;user-select:none}
.q-num{font-family:var(--ff-m);font-size:.72rem;color:var(--txt4);flex-shrink:0;margin-top:.2rem;min-width:1.6rem}
.q-text{flex:1;font-size:.95rem;font-weight:600;line-height:1.5}
.q-badges{display:flex;gap:6px;flex-shrink:0;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.badge{font-size:.62rem;font-weight:700;padding:3px 9px;border-radius:var(--rfull);letter-spacing:.02em;white-space:nowrap}
.badge-beginner{background:rgba(74,222,128,.12);color:var(--green);border:1px solid rgba(74,222,128,.25)}
.badge-intermediate{background:rgba(79,158,255,.12);color:var(--blue);border:1px solid rgba(79,158,255,.25)}
.badge-advanced{background:rgba(248,113,113,.12);color:var(--red);border:1px solid rgba(248,113,113,.25)}
.badge-cat{background:rgba(255,255,255,.05);color:var(--txt3);border:1px solid var(--rim)}
.q-chev{color:var(--txt4);font-size:.85rem;transition:transform .22s;flex-shrink:0;margin-top:.15rem}
.q-card.open .q-chev{transform:rotate(180deg);color:var(--acc)}
.q-ans{max-height:0;overflow:hidden;transition:max-height .28s ease}
.q-card.open .q-ans{max-height:900px}
.q-ans-in{padding:0 1.3rem 1.3rem 3rem;color:var(--txt2);font-size:.9rem;line-height:1.75}
.q-ans-in p{margin-bottom:.7rem}
.q-ans-in p:last-child{margin-bottom:0}
.q-ans-in code{font-family:var(--ff-m);background:rgba(251,191,36,.1);color:var(--acc2);padding:1px 6px;border-radius:5px;font-size:.86em}

/* code block inside answers */
.a-code{background:#080c1a;border:1px solid var(--rim);border-radius:10px;margin:.7rem 0;overflow:hidden}
.a-code-head{display:flex;align-items:center;justify-content:space-between;padding:6px 12px;background:rgba(255,255,255,.03);border-bottom:1px solid var(--rim);font-family:var(--ff-m);font-size:.66rem;color:var(--txt3)}
.a-code pre{margin:0;padding:.8rem 1rem;overflow-x:auto}
.a-code code{background:none;padding:0;font-family:var(--ff-m);font-size:.8rem;line-height:1.65;color:#c9e8ff;white-space:pre}

/* formula block (aptitude / math-heavy answers) */
.a-formula{background:rgba(251,191,36,.06);border:1px solid rgba(251,191,36,.25);border-left:4px solid var(--acc);border-radius:10px;padding:.7rem 1rem;margin:.7rem 0;font-family:var(--ff-m);font-size:.9rem;color:var(--acc2);overflow-x:auto;white-space:nowrap}
.a-formula .fl{display:block;font-family:var(--ff-b);font-size:.68rem;color:var(--txt3);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.35rem}

/* mini inline visual container inside an answer */
.a-viz{margin:.8rem 0;padding:.8rem;background:var(--glass);border:1px solid var(--rim);border-radius:10px}
.a-viz svg{display:block;width:100%;max-width:420px;margin:0 auto}
.a-viz-cap{text-align:center;font-size:.72rem;color:var(--txt3);margin-top:.5rem}

.empty-state{text-align:center;padding:4rem 1rem;color:var(--txt3)}
.empty-state .ei{font-size:2.4rem;margin-bottom:.7rem}

footer{background:var(--ink2);border-top:1px solid var(--rim);padding:2.5rem 2.5rem 1.6rem;margin-top:2rem}
.ft-in{max-width:1100px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}
.ft-copy{font-size:.78rem;color:var(--txt4)}
.ft-links{display:flex;gap:16px;flex-wrap:wrap}
.ft-links a{font-size:.8rem;color:var(--txt3);transition:.15s}
.ft-links a:hover{color:var(--acc2)}

.btt{position:fixed;bottom:24px;right:24px;z-index:200;width:42px;height:42px;border-radius:50%;background:var(--grd-acc);color:#1a1200;border:none;font-size:1.05rem;cursor:pointer;box-shadow:0 4px 20px rgba(251,191,36,.4);opacity:0;transform:translateY(12px);transition:.3s}
.btt.show{opacity:1;transform:translateY(0)}

@media(max-width:780px){
  nav{padding:.85rem 1.2rem}
  .hero{padding:3rem 1.4rem 2rem}
  .role-grid{padding:0 1.2rem 3rem}
  .filter-wrap,.q-list{padding-left:1.2rem;padding-right:1.2rem}
  .q-ans-in{padding-left:1.3rem}
  .filter-wrap{top:56px}
}