:root{
    --ink:#0F1215;
    --ink-2:#171C20;
    --indigo:#1C2B33;
    --jade:#6FA88D;
    --jade-dim:#4C7A66;
    --gold:#C9A227;
    --paper:#EDE6D6;
    --paper-dim:#B8AF9C;
    --cinnabar:#B33A3A;
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--ink);
    color:var(--paper);
    font-family:'Noto Sans TC', sans-serif;
    font-weight:300;
    overflow-x:hidden;
  }
  ::selection{background:var(--gold); color:var(--ink);}

  .serif{font-family:'Noto Serif TC', serif;}
  .mono{font-family:'JetBrains Mono', monospace;}

  a{color:inherit;}

  /* ---------- NAV ---------- */
  nav{
    position:fixed; top:0; left:0; right:0; z-index:50;
    display:flex; justify-content:space-between; align-items:center;
    padding:1.4rem 2.5rem;
    backdrop-filter:blur(10px);
    background:linear-gradient(to bottom, rgba(15,18,21,0.85), transparent);
  }
  .logo{font-family:'Noto Serif TC', serif; font-weight:700; font-size:1.15rem; letter-spacing:0.15em;}
  .logo span{color:var(--gold);}
  nav .links{display:flex; gap:2.2rem; font-size:0.82rem; letter-spacing:0.05em; color:var(--paper-dim);}
  nav .links a{transition:color .25s;}
  nav .links a:hover{color:var(--paper);}
  @media (max-width:720px){ nav .links{display:none;} }

  /* ---------- HERO / DEMO ---------- */
  .hero{
    min-height:100vh;
    padding:8rem 2.5rem 4rem;
    display:flex; flex-direction:column; align-items:center;
    position:relative;
  }
  .eyebrow{
    font-family:'JetBrains Mono', monospace;
    font-size:0.72rem; letter-spacing:0.28em; text-transform:uppercase;
    color:var(--jade); margin-bottom:1.4rem; text-align:center;
  }
  .hero h1{
    font-family:'Noto Serif TC', serif;
    font-weight:900;
    font-size:clamp(2.2rem, 5.2vw, 4.4rem);
    line-height:1.28;
    text-align:center;
    max-width:16em;
    letter-spacing:0.01em;
  }
  .hero h1 em{
    font-style:normal;
    color:var(--gold);
    position:relative;
  }
  .hero p.sub{
    margin-top:1.6rem;
    max-width:34em;
    text-align:center;
    color:var(--paper-dim);
    font-size:1.02rem;
    line-height:1.9;
  }

  /* the step-flow instrument */
  .flow{
    margin-top:3.6rem;
    width:100%;
    max-width:1040px;
    display:flex;
    flex-direction:column;
    gap:1px;
    background:rgba(237,230,214,0.1);
    border:1px solid rgba(237,230,214,0.12);
    border-radius:2px;
    overflow:hidden;
    box-shadow:0 40px 80px -30px rgba(0,0,0,0.6);
  }
  .step{
    background:var(--ink-2);
    padding:2.2rem 2.4rem;
    transition:opacity .5s ease, filter .5s ease;
  }
  .step.pending{opacity:0.35; filter:grayscale(0.6);}
  .step-head{
    font-family:'Noto Serif TC', serif; font-weight:700; font-size:1.15rem;
    display:flex; align-items:center; gap:0.8rem; margin-bottom:1.2rem;
  }
  .step-no{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem;
    color:var(--gold); border:1px solid var(--gold); border-radius:99px;
    padding:0.15rem 0.55rem;
  }

  #inputArea{
    width:100%; min-height:120px;
    background:rgba(0,0,0,0.2);
    border:1px solid rgba(237,230,214,0.15);
    outline:none; resize:vertical;
    color:var(--paper);
    font-family:'Noto Serif TC', serif;
    font-size:1.08rem;
    line-height:1.9;
    padding:1rem;
    border-radius:2px;
  }
  #inputArea:focus{border-color:var(--jade);}
  #inputArea::placeholder{color:rgba(237,230,214,0.35);}
  .presets{display:flex; flex-wrap:wrap; gap:0.5rem; margin-top:1rem;}
  .preset-btn{
    font-family:'Noto Sans TC', sans-serif;
    font-size:0.76rem;
    padding:0.4rem 0.85rem;
    border:1px solid rgba(237,230,214,0.2);
    background:transparent;
    color:var(--paper-dim);
    border-radius:99px;
    cursor:pointer;
    transition:all .2s;
  }
  .preset-btn:hover{border-color:var(--jade); color:var(--paper);}

  .analyze-btn{
    margin-top:1.3rem;
    background:var(--gold); color:var(--ink); border:none;
    font-family:'Noto Sans TC', sans-serif; font-weight:700; font-size:0.9rem;
    padding:0.75rem 1.5rem; border-radius:2px; cursor:pointer;
    transition:opacity .2s;
  }
  .analyze-btn:hover{opacity:0.85;}
  .analyze-btn:disabled{opacity:0.4; cursor:not-allowed;}

  .action-row{display:flex; flex-wrap:wrap; align-items:center; gap:0.8rem;}
  .ghost-btn{
    margin-top:1.3rem;
    background:transparent; color:var(--paper); border:1px solid rgba(237,230,214,0.25);
  }
  .ghost-btn:hover{opacity:1; border-color:var(--jade); background:rgba(111,168,141,0.08);}

  .manual-bridge{
    margin-top:1.4rem;
    border:1px solid rgba(237,230,214,0.15);
    border-radius:2px;
    padding:0.9rem 1.1rem;
  }
  .manual-bridge summary{
    cursor:pointer; list-style:none;
    font-family:'JetBrains Mono', monospace; font-size:0.78rem;
    color:var(--jade); letter-spacing:0.02em;
  }
  .manual-bridge summary::-webkit-details-marker{display:none;}
  .manual-bridge summary::before{content:'▸ '; }
  .manual-bridge[open] summary::before{content:'▾ ';}
  .bridge-hint{
    font-family:'JetBrains Mono', monospace; font-size:0.72rem;
    color:var(--paper-dim); margin:0.8rem 0;
  }
  #manualJsonArea{
    width:100%; min-height:90px;
    background:rgba(0,0,0,0.2);
    border:1px solid rgba(237,230,214,0.15);
    outline:none; resize:vertical;
    color:var(--paper);
    font-family:'JetBrains Mono', monospace;
    font-size:0.82rem;
    line-height:1.7;
    padding:0.8rem;
    border-radius:2px;
  }
  #manualJsonArea:focus{border-color:var(--jade);}
  #manualJsonArea::placeholder{color:rgba(237,230,214,0.3);}

  .bars{display:flex; flex-direction:column; gap:0.9rem; margin-bottom:1.3rem;}
  .bar-row{display:grid; grid-template-columns:minmax(3.6em,auto) 1fr 3.4em; align-items:center; gap:1rem;
    font-family:'JetBrains Mono', monospace; font-size:0.78rem; color:var(--paper-dim);}
  .bar{height:8px; background:rgba(237,230,214,0.1); border-radius:99px; overflow:hidden;}
  .bar i{display:block; height:100%; width:0%; background:var(--jade); border-radius:99px; transition:width 1s cubic-bezier(.2,.8,.2,1), background .6s ease;}
  .bar-row b{text-align:right; color:var(--paper);}
  .engine-note{font-family:'JetBrains Mono', monospace; font-size:0.68rem; color:var(--paper-dim); margin-top:0.8rem;}
  .analyze-btn.loading{opacity:0.6; cursor:wait;}

  .mood-tag{
    font-family:'Noto Serif TC', serif; font-weight:700; font-size:1.5rem; color:var(--gold);
    transition:color .6s ease;
  }

  .assets{display:grid; grid-template-columns:1fr 1fr; gap:1.2rem;}
  @media (max-width:640px){ .assets{grid-template-columns:1fr;} }
  .asset-wide{grid-column:1 / -1;}
  .player-row{display:flex; align-items:center; gap:0.9rem; margin-top:0.8rem;}
  .play-btn{
    font-family:'Noto Sans TC', sans-serif; font-size:0.85rem; font-weight:700;
    padding:0.55rem 1.2rem; border:1px solid var(--gold); background:transparent;
    color:var(--gold); border-radius:99px; cursor:pointer; transition:all .2s;
  }
  .play-btn:hover:not(:disabled){background:rgba(201,162,39,0.12);}
  .play-btn.playing{background:var(--gold); color:var(--ink);}
  .play-btn:disabled{opacity:0.35; cursor:not-allowed; border-color:rgba(237,230,214,0.2); color:var(--paper-dim);}
  .player-status{font-family:'JetBrains Mono', monospace; font-size:0.72rem; color:var(--paper-dim);}
  .player-status.live{color:var(--jade);}

  .asset b{
    display:block; font-family:'JetBrains Mono', monospace; font-size:0.7rem;
    letter-spacing:0.08em; color:var(--jade); margin-bottom:0.5rem;
  }
  .asset p{font-size:0.88rem; color:var(--paper); line-height:1.7; min-height:2.6em;}
  .palette{display:flex; gap:0.5rem;}
  .palette span{width:2.4rem; height:2.4rem; border-radius:3px; display:block; border:1px solid rgba(237,230,214,0.15);}

  .exports{display:flex; flex-wrap:wrap; gap:0.6rem;}
  .export-btn{
    font-family:'Noto Sans TC', sans-serif; font-size:0.85rem; font-weight:500;
    padding:0.65rem 1.1rem; border:1px solid rgba(237,230,214,0.2);
    background:transparent; color:var(--paper); border-radius:2px; cursor:pointer;
    transition:all .2s;
  }
  .export-btn:hover{border-color:var(--gold); background:rgba(201,162,39,0.08);}
  .export-note{
    margin-top:1rem; font-family:'JetBrains Mono', monospace; font-size:0.74rem; color:var(--paper-dim);
  }

  /* ---------- FEATURES ---------- */
  .section{padding:7rem 2.5rem; max-width:1100px; margin:0 auto;}
  .section-head{max-width:32em; margin-bottom:3.2rem;}
  .section-head .eyebrow{text-align:left; margin-bottom:1rem;}
  .section-head h2{
    font-family:'Noto Serif TC', serif; font-weight:700;
    font-size:clamp(1.6rem, 3vw, 2.3rem); line-height:1.5;
  }
  .features{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:rgba(237,230,214,0.1);}
  @media (max-width:800px){ .features{grid-template-columns:1fr;} }
  .feature{background:var(--ink); padding:2.4rem 2rem;}
  .feature .fname{font-family:'Noto Serif TC', serif; font-weight:700; font-size:1.15rem; color:var(--paper); margin-bottom:0.7rem;}
  .feature .fname b{color:var(--jade); font-weight:400; font-family:'JetBrains Mono', monospace; font-size:0.75rem; display:block; margin-bottom:0.5rem; letter-spacing:0.1em;}
  .feature p{color:var(--paper-dim); font-size:0.92rem; line-height:1.85;}

  /* ---------- WHY NOW ---------- */
  .why{background:var(--ink-2); border-top:1px solid rgba(237,230,214,0.08); border-bottom:1px solid rgba(237,230,214,0.08);}
  .why-grid{display:grid; grid-template-columns:1fr 1fr; gap:3rem; align-items:start;}
  @media (max-width:800px){ .why-grid{grid-template-columns:1fr;} }
  .why-grid p{color:var(--paper-dim); line-height:2; font-size:0.98rem;}
  .stat-row{display:flex; flex-direction:column; gap:1.6rem;}
  .stat{border-left:2px solid var(--gold); padding-left:1.2rem;}
  .stat .n{font-family:'Noto Serif TC', serif; font-weight:900; font-size:2rem; color:var(--paper);}
  .stat .d{font-size:0.82rem; color:var(--paper-dim); margin-top:0.2rem;}

  /* ---------- CTA ---------- */
  .cta{text-align:center; padding-bottom:9rem;}
  .cta h2{font-family:'Noto Serif TC', serif; font-weight:700; font-size:clamp(1.6rem,3.4vw,2.5rem); margin-bottom:1rem;}
  .cta p{color:var(--paper-dim); max-width:28em; margin:0 auto 2.2rem; line-height:1.8;}
  .cta-form{display:flex; gap:0.6rem; justify-content:center; flex-wrap:wrap;}
  .cta-form input{
    background:transparent; border:1px solid rgba(237,230,214,0.3);
    padding:0.85rem 1.1rem; color:var(--paper); font-family:'Noto Sans TC', sans-serif;
    min-width:260px; border-radius:2px; outline:none;
  }
  .cta-form input:focus{border-color:var(--jade);}
  .cta-form button{
    background:var(--gold); color:var(--ink); border:none;
    padding:0.85rem 1.6rem; font-family:'Noto Sans TC', sans-serif; font-weight:700;
    cursor:pointer; border-radius:2px; transition:opacity .2s;
    letter-spacing:0.03em;
  }
  .cta-form button:hover{opacity:0.85;}
  .cta-note{font-size:0.76rem; color:var(--paper-dim); margin-top:1rem; font-family:'JetBrains Mono', monospace;}

  footer{padding:2.5rem; text-align:center; color:var(--paper-dim); font-size:0.78rem; border-top:1px solid rgba(237,230,214,0.08);}

  @media (prefers-reduced-motion:reduce){
    *{transition:none !important; animation:none !important;}
  }