:root{
    --ink:#0E1224;
    --navy:#1B2140;
    --paper:#F4F5FA;
    --panel:#FFFFFF;
    --line:#E1E3EE;
    --signal:#3457D5;
    --signal_hover:#5278fe;
    --signal-dark:#233C9C;
    --amber:#FF9F1C;
    --amber_hover:#ffb143;
    --muted:#6B7280;
    --code-bg:#10142A;
    --code-fg:#8FE3C9;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:'Noto Sans TC',sans-serif;
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3{
    font-family:'Noto Serif TC',serif;
    color:var(--navy);
    margin:0 0 .4em;
    letter-spacing:.01em;
  }
  .mono{font-family:'JetBrains Mono',monospace;}
  a{color:inherit;}
  .wrap{max-width:1080px;margin:0 auto;padding:0 24px;}

  /* ---------- top bar ---------- */
  .topbar{
    position:sticky;top:0;z-index:50;
    background:rgba(244,245,250,.92);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);
  }
  .topbar .wrap{
    display:flex;align-items:center;gap:12px;
    padding:14px 24px;
  }
  .brand{
    font-family:'JetBrains Mono',monospace;
    font-weight:700;font-size:14px;letter-spacing:.06em;
    display:flex;align-items:center;gap:8px;
    color:var(--navy);
  }
  .brand::before{
    content:"";width:9px;height:9px;border-radius:2px;
    background:var(--amber);display:inline-block;
  }
  .topnav{display:flex;gap:18px;font-size:14px;font-weight:500;color:var(--muted);margin-left:auto;margin-right:8px;}
  .topnav a{text-decoration:none;transition:color .15s;}
  .topnav a:hover{color:var(--signal);}
  .topbar .cta{
    background:var(--signal);color:#fff;padding:9px 18px;border-radius:6px;
    font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap;transition: all .3s ease-in;
  }

  .down {text-align: center;padding:90px 0 60px; border-top: 1px solid var(--line);}
  .down .cta{ background:var(--signal);color:#fff;padding:9px 18px;border-radius:6px; font-size:16px;font-weight:600;text-decoration:none;white-space:nowrap;margin: 0 auto; transition: all .3s ease-in;}
 .topbar .cta:hover,.down .cta:hover{background:var(--signal_hover)}




  @media(max-width:720px){
    .topbar .wrap{justify-content:space-between;}
    .topnav{display:none;}
  }

  /* ---------- hero / seminar ---------- */
  .hero{
    background:
      radial-gradient(1100px 480px at 85% -10%, rgba(52,87,213,.35), transparent 60%),
      linear-gradient(180deg, var(--ink) 0%, var(--navy) 100%);
    color:#EDEFF9;
    padding:88px 0 76px;
    position:relative;
    overflow:hidden;
  }
  .hero::after{
    content:"";position:absolute;inset:0;
    background-image:linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
    background-size:42px 42px;
    mask-image:radial-gradient(600px 400px at 80% 10%, black, transparent 70%);
    pointer-events:none;
  }
  .hero .wrap{position:relative;}
  .eyebrow{
    font-family:'JetBrains Mono',monospace;
    font-size:13px;color:var(--code-fg);
    letter-spacing:.08em;
    display:inline-flex;align-items:center;gap:10px;
    background:rgba(255,255,255,.06);
    border:1px solid rgba(255,255,255,.14);
    padding:6px 12px;border-radius:100px;
    margin-bottom:22px;
  }
  .eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--amber);animation:pulse 1.8s infinite;}
  @keyframes pulse{0%,100%{opacity:1;}50%{opacity:.3;}}
  .hero h1{
    color:#fff;font-size:clamp(32px,5vw,52px);
    font-weight:900;line-height:1.28;max-width:820px;
  }
  .hero h1 span{color:var(--amber);}
  .hero p.lead{
    max-width:640px;color:#B9BEDA;font-size:17px;margin:18px 0 34px;
  }
  .hero-meta{
    display:flex;flex-wrap:wrap;gap:14px;margin-bottom:40px;
  }
  .hero-meta .item{
    font-family:'JetBrains Mono',monospace;font-size:13px;
    background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);
    padding:9px 14px;border-radius:8px;color:#DFE2F5;
  }
  .hero-meta .item b{color:#fff;}
  .hero .buttons{display:flex;gap:14px;flex-wrap:wrap;}
  .btn-primary{
    background:var(--amber);color:#1B1200;font-weight:700;
    padding:14px 26px;border-radius:8px;text-decoration:none;font-size:15px;
    box-shadow:0 8px 24px -8px rgba(255,159,28,.6);transition: all .3s ease-in;
  }
  .btn-primary:hover {background: var(--amber_hover);}
  .btn-ghost{
    border:1px solid rgba(255,255,255,.3);color:#fff;
    padding:14px 26px;border-radius:8px;text-decoration:none;font-size:15px;font-weight:600;
  }

  /* terminal placeholder card */
  .term{
    margin-top:52px;
    background:var(--code-bg);
    border:1px solid rgba(255,255,255,.12);
    border-radius:12px;overflow:hidden;
    max-width:720px;
    box-shadow:0 30px 60px -25px rgba(0,0,0,.6);
  }
  .term-bar{
    display:flex;align-items:center;gap:8px;
    padding:11px 14px;background:rgba(255,255,255,.04);
    border-bottom:1px solid rgba(255,255,255,.08);
  }
  .term-bar span{width:10px;height:10px;border-radius:50%;background:#484F70;}
  .term-bar .name{margin-left:8px;font-family:'JetBrains Mono',monospace;font-size:14px;color:#8890B5;}
  .term-body{padding:22px 22px 26px;font-family:'JetBrains Mono',monospace;font-size:15px;color:#C7CBE8;}
  .term-body .prompt{color:var(--code-fg);}
  .term-line{margin:0 0 10px;}
  .fill{
    display:inline-block;min-width:150px;border-bottom:1px dashed #4A5180;color:#6B7299;
    padding:0 2px 1px;
  }
  .term-note{
    margin-top:16px;padding-top:16px;border-top:1px dashed rgba(255,255,255,.12);
    color:#8890B5;font-size:12.5px;line-height:1.8;
  }
  .term-note b{color:#C7CBE8;}

  /* ---------- section headers ---------- */
  .section-head{padding:70px 0 30px;}
  .section-head .kicker{
    font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--signal);
    letter-spacing:.08em;margin-bottom:10px;display:block;
  }
  .section-head h2{font-size:clamp(24px,3.4vw,34px);}
  .section-head p{color:var(--muted);max-width:640px;font-size:15px;}

  /* ---------- course grid ---------- */
  .courses{padding-bottom:30px;}
  .course-toggle{ background: var(--amber); color: #1B1200; font-weight: 700; padding: 14px 26px; border-radius: 8px; text-decoration: none; font-size: 15px; box-shadow: 0 8px 24px -8px rgba(255, 159, 28, .6);border: 0;cursor: pointer;transition: all .3s ease-in; }
  .course-toggle:hover {background: var( --amber_hover);}
  
  #courses .course-card{display:none;}
  #courses.is-expanded .course-card{display:block;}

  .course-list{display:flex;flex-direction:column;gap:18px;}
  .course-card{
    background:var(--panel);border:1px solid var(--line);border-radius:14px;
    padding:26px 26px 20px;
    transition:box-shadow .18s, border-color .18s;
  }
  .course-card:hover{box-shadow:0 18px 40px -24px rgba(27,33,64,.35);border-color:#CBD1F0;}
  .course-top{
    display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
    margin-bottom:14px;
  }
  .course-title-wrap{flex:1;min-width:260px;}
  .course-code{
    display:inline-flex;align-items:center;gap:6px;
    font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--signal-dark);
    background:#EDF0FE;border:1px solid #D6DCF9;padding:4px 9px;border-radius:6px;
    margin-bottom:10px;
  }
  .course-title-wrap h3{font-size:20px;margin-bottom:2px;}
  .course-title-en{color:var(--muted);font-size:13px;font-style:italic;}
  .chips{display:flex;gap:8px;flex-wrap:wrap;align-self:flex-start;}
  .chip{
    font-family:'JetBrains Mono',monospace;font-size:12px;font-weight:600;
    padding:6px 11px;border-radius:100px;white-space:nowrap;
  }
  .chip.hrs{background:#EEF1FB;color:var(--navy);}
  .chip.price{background:#FFF3E2;color:#9A5B00;}
  .chip.pts{background:#E9F8F1;color:#0C7A4C;}

  .course-body{font-size:16px;color:#33395A;}
  .course-body .goal{margin-bottom:14px;color:#454B6E;}
  .meta-row{display:flex;gap:34px;flex-wrap:wrap;margin-bottom:16px;}
  .meta-row .col{min-width:220px;flex:1;}
  .meta-row .label{
    font-family:'JetBrains Mono',monospace;font-size:14.5px;color:var(--muted);
    letter-spacing:.06em;margin-bottom:6px;display:block;
  }
  .sched{width:100%;border-collapse:collapse;margin-bottom:6px;font-size:15px;}
  .sched th,.sched td{
    text-align:left;padding:7px 10px;border-bottom:1px solid var(--line);
  }
  .sched th{color:var(--muted);font-weight:600;font-size:12px;font-family:'JetBrains Mono',monospace;}
  .sched td.code{font-family:'JetBrains Mono',monospace;color:var(--signal-dark);}
  .live-tag{
    font-family:'JetBrains Mono',monospace;font-size:10.5px;background:#E9F8F1;color:#0C7A4C;
    padding:2px 7px;border-radius:100px;margin-left:6px;
  }

  details{margin-top:8px;border-top:1px solid var(--line);padding-top:10px;}
  summary{
    cursor:pointer;font-weight:600;font-size:15px;color:var(--signal);
    list-style:none;display:flex;align-items:center;gap:6px;
  }
  summary::-webkit-details-marker{display:none;}
  summary::before{content:"+";font-family:'JetBrains Mono',monospace;font-weight:700;transition:transform .15s;}
  details[open] summary::before{content:"–";}
  .detail-block{padding:14px 2px 4px;}
  .detail-block h4{
    font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--muted);
    letter-spacing:.05em;margin:14px 0 8px;
  }
  .detail-block h4:first-child{margin-top:0;}
  .detail-block ul{margin:0 0 4px;padding-left:20px;}
  .detail-block li{margin-bottom:5px;}
  .note{
    margin-top:12px;padding:12px 14px;background:#FBF7EE;border:1px solid #F0E3C5;
    border-radius:8px;font-size:13px;color:#7A5B12;
  }

  /* agenda list */
  .agenda{
    margin-top:52px;
    background:var(--code-bg);
    border:1px solid rgba(255,255,255,.12);
    border-radius:12px;overflow:hidden;
    max-width:760px;
    box-shadow:0 30px 60px -25px rgba(0,0,0,.6);
  }
  .agenda-head{
    padding:16px 22px;background:rgba(255,255,255,.04);
    border-bottom:1px solid rgba(255,255,255,.08);
    display:flex;align-items:center;justify-content:space-between;
  }
  .agenda-head .name{font-family:'JetBrains Mono',monospace;font-size:12px;color:#8890B5;}
  .agenda-head .dur{font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--code-fg);}
  .agenda-list{list-style:none;margin:0;padding:10px 10px 14px;}
  .agenda-list li{
    display:flex;gap:16px;padding:12px 12px;border-radius:8px;
    transition:background .15s;
  }
  .agenda-list li:hover{background:rgba(255,255,255,.04);}
  .agenda-list .num{
    font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--amber);
    min-width:26px;flex-shrink:0;padding-top:2px;
  }
  .agenda-list .txt b{
    display:block;color:#EDEFF9;font-size:16px;font-weight:700;margin-bottom:3px;
  }
  .agenda-list .txt span{color:#AEB3D4;font-size:15px;line-height:1.65;}

  /* promo banner */
  .promo{
    background:linear-gradient(135deg, #FFF6E9 0%, #FFEFDA 100%);
    border:1px solid #F3DBAE;
    border-radius:16px;
    padding:30px 32px;
    margin:0 0 70px;
    display:flex;gap:28px;flex-wrap:wrap;align-items:center;
    justify-content:space-between;
  }
  .promo-title{flex:1;min-width:260px;}
  .promo-title .tag{
    font-family:'JetBrains Mono',monospace;font-size:12px;color:#9A5B00;
    background:#FFE3B8;padding:4px 10px;border-radius:100px;
    display:inline-block;margin-bottom:10px;letter-spacing:.04em;
  }
  .promo-title h3{font-size:24px;margin-bottom:4px;color:#5A3800;}
  .promo-title p{margin:0;color:#8A6116;font-size:14px;}
  .promo-notes{
    flex:1;min-width:280px;background:#fff;border:1px solid #F0DEB6;
    border-radius:10px;padding:16px 20px;
  }
  .promo-notes .label{
    font-family:'JetBrains Mono',monospace;font-size:11.5px;color:#B98A2E;
    letter-spacing:.05em;margin-bottom:8px;display:block;
  }
  .promo-notes ul{margin:0;padding-left:18px;font-size:15px;color:#5A4420;}
  .promo-notes li{margin-bottom:5px;}