:root{
    --bg-base:#12182B;
    --bg-panel:#1B2340;
    --bg-panel-2:#212B4D;
    --amber:#F5A623;
    --amber-soft:#F5C367;
    --coral:#FF6F5E;
    --teal:#4FD1C5;
    --text-hi:#F3F1EA;
    --text-mid:#C7CCE2;
    --text-low:#8B92B4;
    --line:rgba(243,241,234,0.10);
    --radius:18px;
    --serif: 'Fraunces', serif;
    --sans: 'Space Grotesk', sans-serif;
    --mono: 'IBM Plex Mono', monospace;
  }
  @media (prefers-reduced-motion: reduce){
    *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important;}
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg-base);
    color:var(--text-hi);
    font-family:var(--sans);
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;}
  img,svg{display:block; max-width:100%;}
  ::selection{background:var(--amber); color:#12182B;}
  :focus-visible{outline:2px solid var(--amber); outline-offset:3px; border-radius:4px;}

  /* subtle starfield texture on base bg */
  .stars{
    position:fixed; inset:0; z-index:0; pointer-events:none;
    background-image:
      radial-gradient(1.5px 1.5px at 20px 30px, rgba(255,255,255,0.35), transparent),
      radial-gradient(1px 1px at 120px 90px, rgba(255,255,255,0.25), transparent),
      radial-gradient(1.5px 1.5px at 220px 40px, rgba(255,255,255,0.3), transparent),
      radial-gradient(1px 1px at 320px 140px, rgba(255,255,255,0.2), transparent),
      radial-gradient(1.5px 1.5px at 60px 180px, rgba(255,255,255,0.25), transparent),
      radial-gradient(1px 1px at 400px 60px, rgba(255,255,255,0.2), transparent);
    background-repeat:repeat;
    background-size:440px 220px;
    opacity:0.5;
  }
  .wrap{max-width:1180px; margin:0 auto; padding:0 28px; position:relative; z-index:1;}
  section{position:relative; z-index:1;}

  /* NAV */
  header.nav{
    position:sticky; top:0; z-index:50;
    background:rgba(18,24,43,0.85);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .navbar{display:flex; align-items:center; justify-content:space-between; padding:16px 28px; max-width:1180px; margin:0 auto;}
  .brand{display:flex; align-items:center; gap:10px; font-family:var(--serif); font-weight:600; font-size:1.15rem; letter-spacing:0.2px;}
  .brand .dot{width:10px; height:10px; border-radius:50%; background:var(--amber); box-shadow:0 0 12px var(--amber);}
  nav.links{display:flex; gap:26px; font-size:0.92rem; color:var(--text-mid);}
  nav.links a{text-decoration:none; transition:color .2s;}
  nav.links a:hover{color:var(--amber-soft);}
  .navbar .cta{
    display:inline-block; background:var(--amber); color:#1a1204; font-weight:600;
    padding:9px 18px; border-radius:100px; text-decoration:none; font-size:0.88rem;
    transition:transform .15s ease, box-shadow .15s ease;
  }
  .navbar .cta:hover{transform:translateY(-1px); box-shadow:0 6px 18px rgba(245,166,35,0.35);}

  /* HERO */
  .hero{padding:76px 0 40px;}
  .eyebrow{
    display:inline-flex; align-items:center; gap:8px;
    font-family:var(--mono); font-size:0.78rem; letter-spacing:0.06em; text-transform:uppercase;
    color:var(--teal); border:1px solid rgba(79,209,197,0.35); background:rgba(79,209,197,0.08);
    padding:6px 14px; border-radius:100px; margin-bottom:26px;
  }
  h1.headline{
    font-family:var(--serif); font-weight:600; font-size:clamp(2.4rem, 5.4vw, 4.1rem);
    line-height:1.06; margin:0 0 22px; letter-spacing:-0.01em; max-width:14ch;
  }
  h1.headline em{font-style:italic; color:var(--amber-soft); font-weight:500;}
  .hero-sub{font-size:1.12rem; color:var(--text-mid); max-width:52ch; margin:0 0 34px;}
  .hero-actions{display:flex; gap:14px; flex-wrap:wrap; margin-bottom:64px;}
  .btn-primary{
    background:var(--amber); color:#1a1204; font-weight:600; font-size:0.98rem;
    padding:14px 26px; border-radius:100px; text-decoration:none; border:none; cursor:pointer;
    transition:transform .15s ease, box-shadow .15s ease;
  }
  .btn-primary:hover{transform:translateY(-2px); box-shadow:0 10px 26px rgba(245,166,35,0.3);}
  .btn-ghost{
    background:transparent; color:var(--text-hi); font-weight:500; font-size:0.98rem;
    padding:14px 26px; border-radius:100px; text-decoration:none; border:1px solid var(--line);
    transition:background .15s ease, border-color .15s ease;
  }
  .btn-ghost:hover{background:rgba(243,241,234,0.06); border-color:rgba(243,241,234,0.3);}

  /* interactive hero objects — signature element */
  .life-panel{
    background:var(--bg-panel); border:1px solid var(--line); border-radius:24px;
    padding:34px; display:grid; grid-template-columns:1fr 1fr; gap:32px; align-items:center;
  }
  @media(max-width:760px){ .life-panel{grid-template-columns:1fr;} }
  .life-panel .label{font-family:var(--mono); font-size:0.76rem; text-transform:uppercase; letter-spacing:0.08em; color:var(--text-low); margin-bottom:16px;}
  .object-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:12px;}
  .obj-btn{
    background:var(--bg-panel-2); border:1px solid var(--line); border-radius:14px; padding:16px 8px;
    display:flex; flex-direction:column; align-items:center; gap:8px; cursor:pointer; color:var(--text-mid);
    font-size:0.72rem; font-family:var(--sans); transition:all .18s ease;
  }
  .obj-btn:hover, .obj-btn.active{
    border-color:var(--amber); background:rgba(245,166,35,0.09); color:var(--text-hi); transform:translateY(-2px);
  }
  .obj-btn svg{width:26px; height:26px;}
  .reveal-card{min-height:190px; display:flex; flex-direction:column; justify-content:center;}
  .reveal-card .tag{font-family:var(--mono); font-size:0.72rem; color:var(--teal); text-transform:uppercase; letter-spacing:0.06em; margin-bottom:10px;}
  .reveal-card h3{font-family:var(--serif); font-size:1.5rem; font-weight:600; margin:0 0 10px;}
  .reveal-card p{color:var(--text-mid); font-size:0.96rem; margin:0;}

  /* EMPATHY SECTION */
  .empathy{padding:100px 0 90px; border-top:1px solid var(--line);}
  .empathy .grid2{display:grid; grid-template-columns:1.1fr 0.9fr; gap:64px; align-items:start;}
  @media(max-width:800px){ .empathy .grid2{grid-template-columns:1fr; gap:36px;} }
  .kicker{font-family:var(--mono); font-size:0.78rem; color:var(--coral); text-transform:uppercase; letter-spacing:0.07em; margin-bottom:16px;}
  h2.section-title{font-family:var(--serif); font-size:clamp(1.8rem,3.4vw,2.6rem); font-weight:600; line-height:1.15; margin:0 0 20px; max-width:16ch;}
  .empathy p.lead{font-size:1.05rem; color:var(--text-mid); max-width:52ch;}
  .quiet-list{list-style:none; margin:28px 0 0; padding:0; display:flex; flex-direction:column; gap:18px;}
  .quiet-list li{display:flex; gap:14px; align-items:flex-start; color:var(--text-mid); font-size:0.98rem;}
  .quiet-list .mark{color:var(--amber); font-family:var(--serif); font-style:italic; font-size:1.2rem; flex-shrink:0;}

  /* METHOD */
  .method{padding:90px 0; border-top:1px solid var(--line); background:linear-gradient(180deg, transparent, rgba(27,35,64,0.4) 20%, rgba(27,35,64,0.4) 80%, transparent);}
  .method-steps{display:grid; grid-template-columns:repeat(3,1fr); gap:26px; margin-top:52px;}
  @media(max-width:820px){ .method-steps{grid-template-columns:1fr;} }
  .step{position:relative; padding-top:8px;}
  .step .num{font-family:var(--serif); font-style:italic; font-size:2.6rem; color:var(--amber); opacity:0.85; line-height:1;}
  .step h3{font-family:var(--sans); font-weight:600; font-size:1.18rem; margin:14px 0 10px;}
  .step p{color:var(--text-mid); font-size:0.94rem; margin:0;}
  .step:not(:last-child)::after{
    content:''; position:absolute; top:22px; right:-13px; width:26px; height:1px;
    background:linear-gradient(90deg, var(--line), transparent);
  }
  @media(max-width:820px){ .step:not(:last-child)::after{display:none;} }

  /* TOPICS */
  .topics{padding:90px 0; border-top:1px solid var(--line);}
  .topics-head{display:flex; justify-content:space-between; align-items:flex-end; gap:24px; flex-wrap:wrap; margin-bottom:48px;}
  .topic-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:20px;}
  @media(max-width:900px){ .topic-grid{grid-template-columns:repeat(2,1fr);} }
  @media(max-width:600px){ .topic-grid{grid-template-columns:1fr;} }
  .topic-card{
    background:var(--bg-panel); border:1px solid var(--line); border-radius:18px; padding:26px;
    display:flex; flex-direction:column; gap:14px; transition:border-color .2s ease, transform .2s ease;
  }
  .topic-card:hover{border-color:rgba(245,166,35,0.4); transform:translateY(-3px);}
  .topic-card .swatch{width:38px; height:38px; border-radius:10px; display:flex; align-items:center; justify-content:center;}
  .topic-card .swatch svg{width:20px; height:20px;}
  .topic-card h3{font-family:var(--serif); font-weight:600; font-size:1.2rem; margin:0;}
  .topic-card .hook{color:var(--text-mid); font-size:0.9rem; margin:0;}
  .topic-card .why{
    font-family:var(--mono); font-size:0.78rem; color:var(--text-low); border-top:1px solid var(--line);
    padding-top:12px; margin-top:auto;
  }

  /* LAB / DEMO */
  .lab{padding:100px 0; border-top:1px solid var(--line);}
  .lab-panel{
    background:var(--bg-panel); border:1px solid var(--line); border-radius:24px; padding:36px;
    display:grid; grid-template-columns:1fr 1fr; gap:36px;
  }
  @media(max-width:900px){ .lab-panel{grid-template-columns:1fr;} }
  .lab-canvas-wrap{background:#0D1220; border-radius:16px; padding:14px; border:1px solid var(--line);}
  canvas{width:100%; height:auto; display:block; border-radius:8px;}
  .controls{display:flex; flex-direction:column; gap:22px;}
  .control-row label{display:flex; justify-content:space-between; font-size:0.88rem; color:var(--text-mid); margin-bottom:8px; font-family:var(--mono);}
  .control-row label .val{color:var(--amber-soft); font-weight:600;}
  input[type=range]{
    -webkit-appearance:none; width:100%; height:4px; border-radius:2px; background:var(--bg-panel-2); outline:none;
  }
  input[type=range]::-webkit-slider-thumb{
    -webkit-appearance:none; width:18px; height:18px; border-radius:50%; background:var(--amber); cursor:pointer;
    box-shadow:0 0 0 4px rgba(245,166,35,0.18);
  }
  input[type=range]::-moz-range-thumb{
    width:18px; height:18px; border-radius:50%; background:var(--amber); cursor:pointer; border:none;
    box-shadow:0 0 0 4px rgba(245,166,35,0.18);
  }
  .readouts{display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin-top:6px;}
  .readout{background:var(--bg-panel-2); border-radius:12px; padding:12px; text-align:center; border:1px solid var(--line);}
  .readout .num{font-family:var(--mono); font-size:1.15rem; color:var(--teal); font-weight:500;}
  .readout .lbl{font-size:0.7rem; color:var(--text-low); margin-top:4px; text-transform:uppercase; letter-spacing:0.05em;}
  .lab-note{font-size:0.86rem; color:var(--text-low); margin-top:4px;}
  #launchBtn{
    background:var(--teal); color:#0a1e1c; border:none; padding:12px 20px; border-radius:100px; font-weight:600;
    cursor:pointer; font-family:var(--sans); font-size:0.92rem; transition:transform .15s ease;
  }
  #launchBtn:hover{transform:translateY(-1px);}

  /* PATH SELECTOR */
  .path{padding:90px 0; border-top:1px solid var(--line);}
  .path-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:20px; margin-top:44px;}
  @media(max-width:860px){ .path-grid{grid-template-columns:1fr;} }
  .path-card{
    background:var(--bg-panel); border:1px solid var(--line); border-radius:18px; padding:28px;
    cursor:pointer; transition:all .2s ease; text-align:left;
  }
  .path-card:hover, .path-card.chosen{border-color:var(--amber); background:rgba(245,166,35,0.07);}
  .path-card h3{font-family:var(--serif); font-size:1.15rem; margin:0 0 10px; font-weight:600;}
  .path-card p{color:var(--text-mid); font-size:0.9rem; margin:0;}
  .path-response{
    margin-top:28px; padding:22px 26px; border-radius:16px; background:rgba(79,209,197,0.08);
    border:1px solid rgba(79,209,197,0.3); font-size:0.96rem; color:var(--text-mid); display:none;
  }
  .path-response.show{display:block;}
  .path-response strong{color:var(--text-hi);}

  /* PRACTICE / QUIZ */
  .practice{padding:90px 0; border-top:1px solid var(--line);}
  .quiz-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:24px; margin-top:48px;}
  @media(max-width:860px){ .quiz-grid{grid-template-columns:1fr;} }
  .quiz-card{
    background:var(--bg-panel); border:1px solid var(--line); border-radius:20px; padding:24px;
    display:flex; flex-direction:column; gap:16px;
  }
  .quiz-visual{
    background:#0D1220; border:1px solid var(--line); border-radius:14px; padding:10px;
    height:150px; display:flex; align-items:center; justify-content:center; overflow:hidden;
  }
  .quiz-visual svg{width:100%; height:100%;}
  .anim-tag{font-family:var(--mono); font-size:0.72rem; color:var(--text-low); text-align:center; margin-top:-8px; margin-bottom:10px; letter-spacing:0.3px;}
  .quiz-tag{font-family:var(--mono); font-size:0.72rem; color:var(--teal); text-transform:uppercase; letter-spacing:0.06em;}
  .quiz-q{font-family:var(--serif); font-size:1.08rem; font-weight:600; margin:4px 0 0; line-height:1.3;}
  .quiz-options{display:flex; flex-direction:column; gap:8px;}
  .quiz-opt{
    text-align:left; background:var(--bg-panel-2); border:1px solid var(--line); border-radius:10px;
    padding:10px 14px; color:var(--text-mid); font-size:0.88rem; cursor:pointer; font-family:var(--sans);
    transition:all .15s ease;
  }
  .quiz-opt:hover:not([disabled]){border-color:rgba(245,166,35,0.45); color:var(--text-hi);}
  .quiz-opt.correct{border-color:var(--teal); background:rgba(79,209,197,0.13); color:var(--text-hi);}
  .quiz-opt.wrong{border-color:var(--coral); background:rgba(255,111,94,0.13); color:var(--text-hi);}
  .quiz-opt[disabled]{cursor:default;}
  .quiz-explain{
    font-size:0.86rem; color:var(--text-mid); background:rgba(79,209,197,0.06); border:1px solid rgba(79,209,197,0.25);
    border-radius:12px; padding:12px 15px; display:none;
  }
  .quiz-explain.show{display:block;}
  .quiz-explain strong{color:var(--text-hi);}
  .ai-explain-row{display:none; margin-top:2px;}
  .ai-explain-row.show{display:flex;}
  .ai-explain-btn{
    display:flex; align-items:center; gap:7px; font-family:var(--sans); font-weight:600; font-size:0.82rem;
    color:var(--amber-soft); background:rgba(245,166,35,0.08); border:1px solid rgba(245,166,35,0.35);
    border-radius:100px; padding:8px 16px; cursor:pointer; transition:all .18s ease;
  }
  .ai-explain-btn:hover:not([disabled]){background:rgba(245,166,35,0.16); border-color:rgba(245,166,35,0.55);}
  .ai-explain-btn[disabled]{opacity:0.6; cursor:default;}
  .ai-explain-btn .spark{font-size:0.95em;}
  .ai-explain-panel{
    display:none; margin-top:2px; font-size:0.86rem; line-height:1.6; color:var(--text-mid);
    background:rgba(245,166,35,0.05); border:1px solid rgba(245,166,35,0.28); border-radius:12px; padding:14px 16px;
  }
  .ai-explain-panel.show{display:block;}
  .ai-explain-panel strong{color:var(--text-hi);}
  .ai-explain-panel .ai-label{
    font-family:var(--mono); font-size:0.7rem; color:var(--amber-soft); text-transform:uppercase;
    letter-spacing:0.06em; margin-bottom:8px; display:flex; align-items:center; gap:6px;
  }
  .ai-explain-panel .ai-loading{color:var(--text-low); font-style:italic;}
  .ai-explain-panel .ai-error{color:var(--coral);}
  .ai-dot{width:5px; height:5px; border-radius:50%; background:var(--amber); display:inline-block; animation:aiPulse 1.1s infinite ease-in-out;}
  .ai-dot:nth-child(2){animation-delay:0.15s;} .ai-dot:nth-child(3){animation-delay:0.3s;}
  @keyframes aiPulse{0%,80%,100%{opacity:0.25; transform:scale(0.85);} 40%{opacity:1; transform:scale(1);}}
  .quiz-score{
    font-family:var(--mono); font-size:0.82rem; color:var(--text-low); margin-top:6px;
  }
  .quiz-score .n{color:var(--amber-soft); font-weight:600;}

  /* CHAPTER-WISE PRACTICE (all 19 chapters) */
  .chapterwise{padding:90px 0; border-top:1px solid var(--line);}
  .class-tabs{display:flex; gap:10px; margin:36px 0 20px;}
  .class-tab{
    font-family:var(--sans); font-weight:600; font-size:0.9rem; color:var(--text-mid);
    background:var(--bg-panel); border:1px solid var(--line); border-radius:100px;
    padding:10px 22px; cursor:pointer; transition:all .18s ease;
  }
  .class-tab:hover{border-color:rgba(245,166,35,0.4); color:var(--text-hi);}
  .class-tab.active{background:var(--amber); border-color:var(--amber); color:#1a1204;}
  .chip-row{display:flex; flex-wrap:wrap; gap:10px; margin-bottom:28px;}
  .chapter-chip{
    font-family:var(--sans); font-size:0.84rem; color:var(--text-mid);
    background:var(--bg-panel-2); border:1px solid var(--line); border-radius:100px;
    padding:9px 16px; cursor:pointer; transition:all .18s ease;
  }
  .chapter-chip:hover{border-color:rgba(79,209,197,0.45); color:var(--text-hi);}
  .chapter-chip.active{border-color:var(--teal); background:rgba(79,209,197,0.12); color:var(--text-hi);}
  .chapter-chip .done{color:var(--teal); margin-left:6px; font-size:0.78rem;}
  .chapter-chip .prog{color:var(--text-low); margin-left:6px; font-size:0.76rem; font-family:var(--mono);}
  .chapter-display{max-width:680px;}
  .chapter-display .quiz-visual{height:170px;}

  /* question navigator + notes panel */
  .chapter-meta-row{display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:14px; flex-wrap:wrap;}
  .q-nav{display:flex; flex-wrap:wrap; gap:6px; margin-bottom:16px;}
  .q-pill{
    width:30px; height:30px; border-radius:50%; border:1px solid var(--line); background:var(--bg-panel-2);
    color:var(--text-low); font-family:var(--mono); font-size:0.76rem; cursor:pointer; transition:all .15s ease;
    display:flex; align-items:center; justify-content:center;
  }
  .q-pill:hover{border-color:rgba(245,166,35,0.5); color:var(--text-hi);}
  .q-pill.active{border-color:var(--amber); color:var(--text-hi); background:rgba(245,166,35,0.12);}
  .q-pill.right{border-color:var(--teal); background:rgba(79,209,197,0.14); color:var(--text-hi);}
  .q-pill.wrong{border-color:var(--coral); background:rgba(255,111,94,0.14); color:var(--text-hi);}
  .chapter-nav-btns{display:flex; gap:10px; margin-top:16px;}
  .qn-btn{
    font-family:var(--sans); font-weight:600; font-size:0.84rem; color:var(--text-mid);
    background:var(--bg-panel-2); border:1px solid var(--line); border-radius:100px;
    padding:9px 18px; cursor:pointer; transition:all .18s ease;
  }
  .qn-btn:hover:not([disabled]){border-color:rgba(79,209,197,0.5); color:var(--text-hi);}
  .qn-btn[disabled]{opacity:0.4; cursor:default;}
  .notes-toggle{
    font-family:var(--sans); font-weight:600; font-size:0.82rem; color:var(--amber-soft);
    background:transparent; border:1px solid rgba(245,166,35,0.35); border-radius:100px;
    padding:8px 16px; cursor:pointer; transition:all .18s ease; white-space:nowrap;
  }
  .notes-toggle:hover{background:rgba(245,166,35,0.1);}
  .notes-panel{
    display:none; background:var(--bg-panel-2); border:1px solid var(--line); border-radius:14px;
    padding:20px 22px; margin-bottom:18px; font-size:0.9rem; line-height:1.55; color:var(--text-mid);
  }
  .notes-panel.show{display:block;}
  .notes-panel h4{color:var(--amber-soft); font-family:var(--sans); font-size:0.86rem; margin:14px 0 6px;}
  .notes-panel h4:first-child{margin-top:0;}
  .notes-panel ul{margin:0 0 4px; padding-left:20px;}
  .notes-panel li{margin-bottom:6px;}
  .notes-panel strong{color:var(--text-hi);}
  .materials-downloads{display:flex; gap:12px; flex-wrap:wrap; margin:18px 0 6px;}
  .dl-btn{
    display:inline-flex; align-items:center; gap:8px; font-family:var(--sans); font-weight:600; font-size:0.86rem;
    color:var(--text-hi); background:var(--bg-panel-2); border:1px solid var(--line); border-radius:10px;
    padding:12px 18px; text-decoration:none; transition:all .18s ease;
  }
  .dl-btn:hover{border-color:rgba(79,209,197,0.5);}

  /* quiz animations */
  .pendulum-pivot{transform-box:view-box; transform-origin:100px 20px; animation:swing 2.4s ease-in-out infinite;}
  @keyframes swing{ 0%,100%{transform:rotate(-32deg);} 50%{transform:rotate(32deg);} }
  .piston-head{transform-box:view-box; animation:piston-move 2.2s ease-in-out infinite;}
  @keyframes piston-move{ 0%,100%{transform:translateY(0);} 50%{transform:translateY(-26px);} }

  /* ---- Ask-your-own-question column ---- */
  .chapterwise-grid{display:grid; grid-template-columns:1fr 1fr; gap:24px; align-items:start;}
  @media(max-width:900px){ .chapterwise-grid{grid-template-columns:1fr;} }
  .cq-card{position:relative; overflow:hidden;}
  .cq-card::before{
    content:""; position:absolute; top:-40%; right:-20%; width:220px; height:220px; border-radius:50%;
    background:radial-gradient(circle, rgba(245,166,35,0.16), transparent 70%); pointer-events:none;
  }
  .cq-head{display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap;}
  .cq-head h3{font-family:var(--serif); font-size:1.1rem; font-weight:600; margin:0;}
  .cq-badge{font-family:var(--mono); font-size:0.72rem; color:var(--teal); border:1px solid rgba(79,209,197,0.35); background:rgba(79,209,197,0.1); border-radius:100px; padding:5px 12px; white-space:nowrap;}
  .cq-sub{color:var(--text-mid); font-size:0.86rem; margin:0;}
  .cq-textarea{
    width:100%; min-height:88px; resize:vertical; font-family:var(--sans); font-size:0.9rem; color:var(--text-hi);
    background:var(--bg-panel-2); border:1px solid var(--line); border-radius:12px; padding:12px 14px;
  }
  .cq-textarea:focus-visible{outline:2px solid var(--amber); outline-offset:2px;}
  .cq-row{display:flex; align-items:center; gap:12px; flex-wrap:wrap;}
  .cq-submit-btn{
    font-family:var(--sans); font-weight:600; font-size:0.88rem; color:#1a1204; background:var(--amber);
    border:1px solid var(--amber); border-radius:100px; padding:11px 22px; cursor:pointer; transition:all .18s ease;
  }
  .cq-submit-btn:hover:not([disabled]){background:var(--amber-soft); border-color:var(--amber-soft);}
  .cq-submit-btn[disabled]{opacity:0.55; cursor:default;}
  .cq-hint{font-size:0.78rem; color:var(--text-low);}
  .cq-stage{
    background:#0D1220; border:1px solid var(--line); border-radius:14px; height:150px;
    display:flex; align-items:center; justify-content:center; overflow:hidden; position:relative;
  }
  .cq-stage svg{width:100%; height:100%;}
  .cq-stage .cq-idle{color:var(--text-low); font-family:var(--mono); font-size:0.78rem; text-align:center; padding:0 20px;}
  .cq-category-tag{font-family:var(--mono); font-size:0.72rem; color:var(--text-low); text-align:center; letter-spacing:0.3px;}
  .cq-steps{display:flex; flex-direction:column; gap:8px;}
  .cq-step{
    font-size:0.87rem; color:var(--text-mid); background:var(--bg-panel-2); border:1px solid var(--line);
    border-radius:10px; padding:10px 13px; opacity:0; transform:translateY(10px);
    animation:cqStepIn .5s ease forwards;
  }
  .cq-step b{color:var(--amber-soft); font-family:var(--mono); font-size:0.76rem; margin-right:6px;}
  @keyframes cqStepIn{ to{opacity:1; transform:translateY(0);} }
  .cq-answer{
    font-size:0.9rem; color:var(--text-hi); background:rgba(79,209,197,0.08); border:1px solid rgba(79,209,197,0.3);
    border-radius:12px; padding:12px 15px; opacity:0; transform:translateY(10px); animation:cqStepIn .5s ease forwards;
  }
  .cq-answer b{color:var(--teal);}
  .cq-error{color:var(--coral); font-size:0.86rem;}
  .cq-loading{color:var(--text-low); font-style:italic; font-size:0.85rem;}

  /* generated-answer animation templates */
  .cq-proj-ball{ animation:cqArc 1.6s ease-in-out infinite; }
  @keyframes cqArc{
    0%{ transform:translate(20px,90px); } 50%{ transform:translate(150px,20px); } 100%{ transform:translate(280px,90px); }
  }
  .cq-wave-path{ stroke-dasharray:14 10; animation:cqDash 1.1s linear infinite; }
  @keyframes cqDash{ to{ stroke-dashoffset:-48; } }
  .cq-circuit-dot{ animation:cqFlow 1.8s linear infinite; }
  @keyframes cqFlow{
    0%{ offset-distance:0%; opacity:0; } 8%{opacity:1;} 92%{opacity:1;} 100%{ offset-distance:100%; opacity:0; }
  }
  .cq-spring-mass{ transform-box:view-box; transform-origin:150px 70px; animation:cqBounce 1.3s ease-in-out infinite; }
  @keyframes cqBounce{ 0%,100%{ transform:translateY(-18px); } 50%{ transform:translateY(18px); } }
  .cq-atom-e{ transform-box:fill-box; transform-origin:center; animation:cqOrbit 2.6s linear infinite; }
  @keyframes cqOrbit{ to{ transform:rotate(360deg); } }

  /* --- extra generated-answer animation templates --- */
  .cq-incline-block{ transform-box:view-box; animation:cqSlide 1.8s ease-in infinite; }
  @keyframes cqSlide{ 0%{ transform:translate(60px,-40px); } 100%{ transform:translate(210px,40px); } }
  .cq-optics-ray{ stroke-dasharray:10 6; animation:cqDash 1s linear infinite; }
  .cq-gas-particle{ animation:cqDrift linear infinite; }
  @keyframes cqDrift{ 0%{ transform:translate(0,0); } 25%{ transform:translate(10px,-8px); } 50%{ transform:translate(-6px,6px); } 75%{ transform:translate(8px,4px); } 100%{ transform:translate(0,0); } }
  .cq-piston-top{ transform-box:view-box; transform-origin:150px 20px; animation:piston-move 1.8s ease-in-out infinite; }
  .cq-field-line{ stroke-dasharray:8 6; animation:cqDash 1.4s linear infinite; }
  .cq-compass-needle{ transform-box:fill-box; transform-origin:center; animation:cqNeedle 2.4s ease-in-out infinite; }
  @keyframes cqNeedle{ 0%,100%{ transform:rotate(-18deg); } 50%{ transform:rotate(18deg); } }
  .cq-rotor{ transform-box:fill-box; transform-origin:center; animation:cqOrbit 1.4s linear infinite; }
  .cq-fluid-drop{ animation:cqFlow 1.6s linear infinite; }

  footer{padding:56px 0 40px; border-top:1px solid var(--line); text-align:center;}
  footer .brand{justify-content:center; margin-bottom:14px;}
  footer p{color:var(--text-low); font-size:0.86rem; max-width:44ch; margin:0 auto;}
  .footer-contact{display:flex; justify-content:center; gap:16px; flex-wrap:wrap; margin-top:24px;}
  .footer-contact-item{
    display:flex; flex-direction:column; align-items:center; gap:4px; text-decoration:none;
    color:var(--text-hi); background:var(--bg-panel-2); border:1px solid var(--line); border-radius:12px;
    padding:14px 26px; min-width:170px; transition:all .18s ease;
  }
  .footer-contact-item:hover{border-color:rgba(79,209,197,0.5); transform:translateY(-2px);}
  .footer-contact-label{font-family:var(--sans); font-weight:600; font-size:0.82rem; color:var(--teal);}
  .footer-contact-value{font-family:var(--mono); font-size:0.86rem; color:var(--text-mid);}

  /* ---- Accounts: admin / student login + dashboards ---- */
  .account-section{padding:64px 0;}
  .auth-tabs{display:flex; gap:8px; margin-bottom:18px;}
  .auth-tab{
    font-family:var(--sans); font-weight:600; font-size:0.86rem; color:var(--text-mid); background:var(--bg-panel-2);
    border:1px solid var(--line); border-radius:100px; padding:9px 20px; cursor:pointer; transition:all .18s ease;
  }
  .auth-tab.active{color:#1a1204; background:var(--amber); border-color:var(--amber);}
  .auth-forms{display:grid; grid-template-columns:1fr 1fr; gap:20px;}
  @media(max-width:800px){ .auth-forms{grid-template-columns:1fr;} }
  .auth-form{
    display:flex; flex-direction:column; gap:10px; background:var(--bg-panel); border:1px solid var(--line);
    border-radius:14px; padding:20px;
  }
  .auth-form h3{margin:0 0 4px; font-family:var(--serif); font-size:1rem; font-weight:600;}
  .auth-form input, .auth-form select, .auth-form textarea{
    font-family:var(--sans); font-size:0.9rem; color:var(--text-hi); background:var(--bg-panel-2);
    border:1px solid var(--line); border-radius:10px; padding:10px 12px;
  }
  .auth-error{color:var(--coral); font-size:0.82rem; min-height:1.1em;}
  .auth-success{color:var(--teal); font-size:0.82rem; min-height:1.1em;}
  .auth-status{
    display:flex; align-items:center; gap:12px; flex-wrap:wrap; background:var(--bg-panel);
    border:1px solid var(--line); border-radius:14px; padding:16px 20px;
  }
  .admin-file-list{display:flex; flex-direction:column; gap:8px; margin-top:12px;}
  .admin-file-row{
    display:flex; align-items:center; justify-content:space-between; gap:10px; background:var(--bg-panel-2);
    border:1px solid var(--line); border-radius:10px; padding:9px 13px; font-size:0.85rem;
  }
  .admin-file-row a{color:var(--teal); text-decoration:none; font-weight:600;}
  .admin-file-row button{background:none; border:none; color:var(--coral); cursor:pointer; font-size:0.8rem;}
  .uq-form label{display:flex; flex-direction:column; gap:6px; font-size:0.85rem; color:var(--text-mid); margin-bottom:12px;}
  .my-q-card{
    background:var(--bg-panel-2); border:1px solid var(--line); border-radius:12px; padding:14px 16px; margin-bottom:10px;
  }
  .my-q-card .mq-opts{display:flex; flex-direction:column; gap:6px; margin:10px 0;}
  .my-q-card .mq-opt{
    text-align:left; font-family:var(--sans); font-size:0.86rem; color:var(--text-hi); background:var(--bg-panel);
    border:1px solid var(--line); border-radius:8px; padding:8px 12px; cursor:pointer;
  }
  .my-q-card .mq-opt.mq-correct{border-color:var(--teal); background:rgba(79,209,197,0.12);}
  .my-q-card .mq-opt.mq-wrong{border-color:var(--coral); background:rgba(255,111,94,0.12);}

/* ---- Login gate (shown on pages that require an account) ---- */
.login-gate{
  max-width:560px; margin:80px auto; text-align:center;
  background:var(--bg-panel); border:1px solid var(--line, rgba(199,204,226,0.15));
  border-radius:16px; padding:48px 32px;
}
.login-gate h2{ margin-bottom:12px; }
.login-gate p{ color:var(--text-mid); margin-bottom:22px; }
.login-gate a.cta-inline{
  display:inline-block; background:var(--amber); color:#12182B; font-weight:600;
  padding:12px 26px; border-radius:999px; text-decoration:none;
}
.login-gate a.cta-inline:hover{ background:var(--amber-soft); }