:root{
    --bg:rgb(227, 226, 226);
    --bg-soft:#ede2df;
    --brown-900:#3f2900;
    --brown-800:#5c3d00;
    --brown-700:#6e4a05;
    --brown-600:#805004;
    --brown-500:#8b5e0f;
    --brown-400:#a06f1a;
    --cream:#fdf6ee;
    --gold:#e8b64a;
    --good:#5f8a4f;
    --bad:#b23b3b;
    --shadow: 0 10px 24px rgba(60, 38, 0, .18);
  }
  *{box-sizing:border-box;}
    /* DarkLight Mood */
  button,
.btn{
    background:var(--brown-800);
    color:white;
    padding:14px 30px;
    border:none;
    border-radius:11px;
    text-decoration:none;
    font-weight:bold;
    cursor:pointer;
    transition:.3s;
}
button:hover,
.btn:hover:hover{
    background:var(--brown-900);
    transform:translateY(-3px);
}

/*==END==*/
  body{
    margin:0;
    background: var(--bg);
    background-image: radial-gradient(circle at 15% 0%, #efe3e0 0%, var(--bg) 55%);
    font-family:'Poppins', sans-serif;
    color:var(--brown-900);
    min-height:100vh;
  }
  .wrap{max-width:980px;margin:0 auto;padding:48px 24px 100px;}
  header{text-align:center;margin-bottom:28px;}
  .brand{
    font-family:'Baloo 2', sans-serif;font-weight:800;
    font-size:clamp(32px, 5vw, 52px);color:var(--brown-600);
    display:flex;align-items:center;justify-content:center;gap:14px;margin:0;
  }
  .tagline{color:var(--brown-500);font-size:18px;margin-top:8px;font-weight:500;}
  .backbtn{
    display:inline-flex;align-items:center;gap:8px;margin-top:22px;padding:13px 26px;border-radius:14px;
    background:var(--brown-800);color:var(--cream);font-weight:700;text-decoration:none;font-size:15px;
    box-shadow:var(--shadow);transition:transform .15s ease, background .15s ease;border:none;cursor:pointer;
  }
  .backbtn:hover{background:var(--brown-900);transform:translateY(-2px);}

  .lesson-head{
    background:linear-gradient(145deg, var(--brown-600), var(--brown-800));
    border-radius:22px;padding:34px 32px;color:var(--cream);
    box-shadow:var(--shadow); margin:38px 0 30px; position:relative; overflow:hidden;
  }
  .lesson-head::after{
    content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;
    background:radial-gradient(circle, rgba(232,182,74,.25), transparent 70%);
  }
  .eyebrow{font-size:13px;letter-spacing:.14em;text-transform:uppercase;opacity:.85;font-weight:600;}
  .lesson-head h1{font-family:'Baloo 2';font-size:clamp(26px,4vw,38px);margin:8px 0 10px;}
  .lesson-head p{margin:0;opacity:.92;font-size:16px;line-height:1.6;max-width:560px;}

  section.card{
    background:var(--cream);border-radius:20px;padding:30px 28px;margin-bottom:26px;
    box-shadow: 0 6px 18px rgba(60,38,0,.08);border:1px solid #f0e3d8;
  }
  h2.section-title{
    font-family:'Baloo 2';color:var(--brown-700);font-size:22px;margin:0 0 6px;
    display:flex;align-items:center;gap:10px;
  }
  .section-sub{color:#8a7a63;margin:0 0 22px;font-size:15px;}

  /* Keyboard */
  .keyboard{
    background:#2c2013;border-radius:18px;padding:22px 18px;
    box-shadow: inset 0 0 0 2px #4a3520, var(--shadow); overflow-x:auto;
  }
  .kb-row{display:flex;gap:7px;margin-bottom:7px;justify-content:center;}
  .key{
    min-width:44px;height:44px;border-radius:8px;
    display:flex;align-items:center;justify-content:center;position:relative;
    font-weight:700;font-size:14px;color:#2c2013;
    background:#5a4a38;
    box-shadow:0 3px 0 rgba(0,0,0,.25);
    transition: transform .1s ease, box-shadow .1s ease, background .15s ease;
    user-select:none;flex-shrink:0;
  }
  .key.home{background:var(--gold);}
  .key.bump::after{
    content:"";position:absolute;bottom:6px;width:14px;height:3px;border-radius:2px;background:#2c2013;opacity:.5;
  }
  .key.space{min-width:280px;}
  .key.current{outline:3px solid #fff; transform:translateY(2px); box-shadow:0 1px 0 rgba(0,0,0,.25);}
  .key.wrong-flash{background:var(--bad) !important;}

  /* Explainer */
  .homerow-visual{
    display:flex;justify-content:center;gap:8px;margin-bottom:8px;flex-wrap:wrap;
  }
  .homerow-visual .hk{
    width:46px;height:46px;border-radius:10px;background:var(--gold);
    display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--brown-900);
    font-family:'Fira Code',monospace;font-size:18px;
  }
  .hint{text-align:center;color:var(--brown-500);font-size:14px;margin-top:6px;}

  /* Typing test */
  .test-box{background:var(--bg-soft);border-radius:16px;padding:26px 22px;}
  .target-text{
    font-family:'Fira Code', monospace;font-size:24px;line-height:1.8;
    letter-spacing:1px;text-align:center;margin-bottom:18px;min-height:70px;
  }
  .target-text span.pending{color:#b7a894;}
  .target-text span.correct{color:var(--good);}
  .target-text span.incorrect{color:var(--cream);background:var(--bad);border-radius:3px;}
  .target-text span.cursor{border-left:2px solid var(--brown-800);}
  #typedInput{
    width:100%;padding:14px 16px;border-radius:12px;border:2px solid var(--brown-400);
    font-family:'Fira Code', monospace;font-size:18px;text-align:center;
    background:var(--cream);color:var(--brown-900);outline:none;
  }
  #typedInput:focus{border-color:var(--brown-700);}
  .test-stats{display:flex;justify-content:center;gap:30px;margin-top:20px;font-size:14px;color:var(--brown-700);font-weight:600;}
  .test-stats span b{font-size:22px;display:block;color:var(--brown-900);}
  .restart{
    display:block;margin:20px auto 0;padding:10px 22px;border-radius:12px;border:2px solid var(--brown-600);
    background:transparent;color:var(--brown-700);font-weight:700;cursor:pointer;font-family:'Poppins';
  }
  .restart:hover{background:var(--brown-600);color:var(--cream);}

  .nav-btns{display:flex;justify-content:space-between;gap:14px;margin-top:36px;flex-wrap:wrap;}
  .navbtn{
    flex:1;min-width:200px;text-align:center;padding:16px;border-radius:16px;
    background:var(--brown-600);color:var(--cream);font-weight:700;text-decoration:none;
    box-shadow:var(--shadow);transition:transform .15s ease;
  }
  .navbtn:hover{transform:translateY(-2px);}
  .navbtn.ghost{background:transparent;border:2px solid var(--brown-500);color:var(--brown-700);box-shadow:none;}

  @media (max-width:640px){
    .key{min-width:28px;height:34px;font-size:10px;}
    .key.space{min-width:130px;}
    .target-text{font-size:18px;}
  }