:root{
      --bg:#0b1220;         /* gelap elegan */
      --panel:#0f1b31;      /* panel */
      --ink:#e9eefc;        /* teks utama */
      --muted:#a8b0c6;      /* teks sekunder */
      --brand:#5aa2ff;      /* aksen */
      --ok:#22c55e;         /* benar */
      --bad:#ef4444;        /* salah */
      --warn:#f59e0b;       /* caret */
    }
    *{box-sizing:border-box}
    body{
      margin:0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, "Noto Sans", Arial;
      background: radial-gradient(1200px 600px at 20% -10%, #0f2749 0%, transparent 60%),
                  radial-gradient(1000px 600px at 120% 0%, #1a2d52 0%, transparent 60%),
                  var(--bg);
      color:var(--ink);
      min-height:100vh;
      display:flex; align-items:center; justify-content:center; padding:24px;
    }
    .app{ width:min(980px,100%); }
    header{ display:flex; gap:12px; align-items:center; justify-content:space-between; margin-bottom:16px; }
    .title{ font-weight:800; letter-spacing:.5px; font-size:clamp(18px,3.2vw,28px) }
    .toolbar{ display:flex; flex-wrap:wrap; gap:10px; align-items:center }
    .card{ background:linear-gradient(180deg, rgba(255,255,255,.04), rgba(0,0,0,.05)); border:1px solid rgba(255,255,255,.08); box-shadow: 0 10px 30px rgba(0,0,0,.3); border-radius:18px; padding:16px }
    select, textarea, input[type="text"]{ background:#091226; color:var(--ink); border:1px solid rgba(255,255,255,.12); border-radius:10px; padding:10px 12px; outline:none; }
    textarea{ width:100%; min-height:82px; resize:vertical }
    button{ background:linear-gradient(180deg, #7bb2ff, #3b82f6); color:white; border:0; border-radius:12px; padding:10px 14px; font-weight:700; cursor:pointer; box-shadow:0 8px 16px rgba(59,130,246,.35); }
    button.secondary{ background:#16223a; border:1px solid rgba(255,255,255,.12); box-shadow:none; color:var(--ink) }
    button:disabled{ opacity:.6; cursor:not-allowed }
    a.btn{display:inline-block;background:#16223a;border:1px solid rgba(255,255,255,.18);color:var(--ink);padding:8px 10px;border-radius:10px;text-decoration:none}

    .grid{ display:grid; grid-template-columns: 1fr; gap:14px }
    @media(min-width:860px){ .grid{ grid-template-columns: 360px 1fr } }

    .stats{ display:grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap:10px; }
    .metric{ background:var(--panel); border:1px solid rgba(255,255,255,.08); border-radius:14px; padding:12px 10px; text-align:center }
    .metric .label{ color:var(--muted); font-size:12px; margin-bottom:6px }
    .metric .value{ font-size:clamp(18px,4vw,28px); font-weight:800 }

    .words-wrap{ position:relative; padding:18px; background:var(--panel); border:1px solid rgba(255,255,255,.08); border-radius:16px; min-height:180px; overflow:hidden }
    .words{ line-height: 2.1; font-size: clamp(18px, 2.3vw, 22px); color:#dfe7ff; word-spacing: 12px }
    .word{ display:inline-block; padding:2px 1px; border-radius:6px }
    .char{ position:relative; white-space:pre }
    .char.correct{ color:var(--ok) }
    .char.incorrect{ color:var(--bad); text-decoration: underline wavy rgba(239,68,68,.55) }
    .word.completed{ background: rgba(34,197,94,.08) }
    .word.failed{ background: rgba(239,68,68,.08) }

    .caret{ position:absolute; width:2px; background:var(--warn); height:1.6em; transform: translateY(.15em); animation:blink .9s steps(1) infinite }
    @keyframes blink{ 50%{ opacity:.2 } }

    .hidden-input{ position:absolute; opacity:0; pointer-events:none; }
    .help{ color:var(--muted); font-size:12px }
    .kbd{ background:#0b1428; border:1px solid rgba(255,255,255,.12); padding:2px 6px; border-radius:6px; font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace }

    footer{ margin-top:16px; display:flex; gap:10px; align-items:center; justify-content:space-between; flex-wrap:wrap }