:root{
    --teal:#0D9488; --teal-dark:#0B7A70; --teal-light:#E6F7F5;
    --amber:#F59E0B; --amber-dark:#D97706; --amber-light:#FEF3E2;
    --ink:#1F2937; --gray:#718096; --line:#E5E7EB; --bg:#F8FAFC;
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  body{font-family:'Helvetica Neue',Arial,'Segoe UI',sans-serif;color:var(--ink);background:var(--bg);line-height:1.5;}

  /* ---------- Header ---------- */
  header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;}
  .header-inner{max-width:1080px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;justify-content:space-between;}
  .logo svg{display:block;height:190px;width:auto;margin:-30px 0;}
  .btn{display:inline-block;border:none;cursor:pointer;font-weight:700;border-radius:10px;transition:.15s;text-decoration:none;text-align:center;}
  .btn-outline{background:#fff;color:var(--teal);border:2px solid var(--teal);padding:9px 22px;font-size:15px;}
  .btn-outline:hover{background:var(--teal-light);}
  .login-bar{display:flex;gap:10px;align-items:center;}
  .user-chip{display:inline-flex;align-items:center;gap:8px;background:var(--teal-light);border:1px solid var(--teal);border-radius:999px;padding:8px 16px;font-size:14px;font-weight:700;color:var(--teal-dark);text-decoration:none;}
  .user-chip:hover{background:#d3f0ec;}
  .role-sel{border:2px solid var(--teal);border-radius:10px;padding:9px 12px;font-size:15px;font-weight:700;color:var(--teal);background:#fff;cursor:pointer;font-family:inherit;}
  .role-sel:focus{outline:none;box-shadow:0 0 0 3px var(--teal-light);}
  .btn-teal{background:var(--teal);color:#fff;padding:12px 28px;font-size:16px;}
  .btn-teal:hover{background:var(--teal-dark);}
  .btn-amber{background:var(--amber);color:#fff;padding:12px 28px;font-size:16px;}
  .btn-amber:hover{background:var(--amber-dark);}

  /* ---------- Hero ---------- */
  .hero{background:linear-gradient(160deg,#fff 0%,var(--teal-light) 100%);padding:48px 20px 40px;text-align:center;}
  .hero h1{font-size:clamp(28px,4.5vw,44px);font-weight:800;letter-spacing:-.5px;}
  .hero h1 .catch{color:var(--teal);} .hero h1 .words{color:var(--amber);}
  .hero p.sub{margin-top:12px;font-size:18px;color:var(--gray);max-width:640px;margin-left:auto;margin-right:auto;}
  .badge-free{display:inline-block;margin-top:18px;background:var(--amber-light);color:var(--amber-dark);border:1px solid var(--amber);border-radius:999px;padding:7px 18px;font-weight:700;font-size:14px;}

  /* ---------- Selector card ---------- */
  .wrap{max-width:1080px;margin:0 auto;padding:0 20px;}
  .selector{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 8px 30px rgba(13,148,136,.10);padding:28px;margin-top:-8px;position:relative;}
  .sel-title{font-size:20px;font-weight:800;text-align:center;margin-bottom:22px;}
  .sel-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:start;}
  .sel-col label{display:block;font-size:13px;font-weight:700;color:var(--gray);text-transform:uppercase;letter-spacing:.8px;margin-bottom:10px;text-align:center;}
  .lang-list{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;}
  .chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:8px 14px;font-size:14.5px;cursor:pointer;transition:.12s;user-select:none;font-weight:600;color:var(--ink);}
  .chip:hover{border-color:var(--teal);}
  .chip.on{background:var(--teal);border-color:var(--teal);color:#fff;}
  .arrow{align-self:center;font-size:26px;color:var(--amber);font-weight:800;padding-top:18px;}
  .level-row{margin-top:26px;text-align:center;}
  .level-row label{display:block;font-size:13px;font-weight:700;color:var(--gray);text-transform:uppercase;letter-spacing:.8px;margin-bottom:10px;}
  .levels{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;}
  .lv{border:1.5px solid var(--line);background:#fff;border-radius:10px;padding:10px 18px;font-weight:700;cursor:pointer;transition:.12s;font-size:15px;}
  .lv:hover{border-color:var(--amber);}
  .lv.on{background:var(--amber);border-color:var(--amber);color:#fff;}
  .lv small{display:block;font-weight:500;font-size:11px;color:inherit;opacity:.75;}
  .sel-summary{margin-top:20px;text-align:center;font-size:15px;color:var(--gray);}
  .sel-summary b{color:var(--teal);}

  /* ---------- Two functions ---------- */
  .funcs{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:36px 0 10px;}
  .func{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px 26px;text-align:center;box-shadow:0 4px 16px rgba(0,0,0,.05);display:flex;flex-direction:column;}
  .func .num{width:38px;height:38px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-weight:800;color:#fff;margin:0 auto 14px;font-size:17px;}
  .func.test .num{background:var(--teal);}
  .func.learn .num{background:var(--amber);}
  .func h3{font-size:21px;font-weight:800;margin-bottom:10px;}
  .func p{color:var(--gray);font-size:15px;flex:1;}
  .func ul{list-style:none;margin:14px 0 20px;text-align:left;font-size:14.5px;color:var(--ink);flex:1;}
  .func ul li{padding:5px 0 5px 26px;position:relative;}
  .func.test ul li::before{content:"✓";position:absolute;left:4px;color:var(--teal);font-weight:800;}
  .func.learn ul li::before{content:"✓";position:absolute;left:4px;color:var(--amber);font-weight:800;}

  /* ---------- How ---------- */
  .how{margin:44px 0;}
  .how h2{text-align:center;font-size:24px;font-weight:800;margin-bottom:24px;}
  .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
  .step{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 16px;text-align:center;}
  .step .s-ic{font-size:26px;}
  .step h4{font-size:15px;font-weight:800;margin:8px 0 4px;}
  .step p{font-size:13px;color:var(--gray);}

  /* ---------- Kurumsal ---------- */
  .corp{background:linear-gradient(150deg,var(--teal) 0%,var(--teal-dark) 100%);border-radius:18px;padding:36px 30px;color:#fff;margin:10px 0 20px;}
  .corp h2{font-size:24px;font-weight:800;margin-bottom:8px;}
  .corp p.lead{opacity:.92;font-size:15.5px;max-width:720px;}
  .corp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0;}
  .corp-item{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);border-radius:14px;padding:18px 16px;}
  .corp-item .c-ic{font-size:24px;}
  .corp-item h4{font-size:15px;font-weight:800;margin:8px 0 4px;}
  .corp-item p{font-size:13.5px;opacity:.9;}
  .corp .btn-amber{margin-top:4px;}
  @media(max-width:760px){.corp-grid{grid-template-columns:1fr;}}

  /* ---------- Footer ---------- */
  footer{background:#fff;border-top:1px solid var(--line);margin-top:50px;padding:26px 20px;text-align:center;color:var(--gray);font-size:14px;}
  footer a{color:var(--teal);text-decoration:none;font-weight:600;}

  /* ---------- Modal ---------- */
  .modal-bg{position:fixed;inset:0;background:rgba(15,23,42,.55);display:none;align-items:center;justify-content:center;z-index:100;padding:20px;}
  .modal-bg.open{display:flex;}
  .modal{background:#fff;border-radius:18px;max-width:420px;width:100%;padding:28px;position:relative;}
  .modal .close{position:absolute;top:12px;right:16px;border:none;background:none;font-size:22px;cursor:pointer;color:var(--gray);}
  .tabs{display:flex;gap:8px;margin-bottom:20px;}
  .tab{flex:1;padding:10px;border-radius:10px;border:1.5px solid var(--line);background:#fff;font-weight:700;cursor:pointer;font-size:14px;}
  .tab.on{background:var(--teal);border-color:var(--teal);color:#fff;}
  .modal input{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:11px 14px;font-size:15px;margin-bottom:12px;}
  .modal input:focus{outline:none;border-color:var(--teal);}
  .field-label{display:block;font-size:12.5px;font-weight:700;color:var(--gray);text-transform:uppercase;letter-spacing:.6px;margin-bottom:6px;}
  .email-row{display:flex;gap:8px;margin-bottom:12px;}
  .email-row input{flex:3;margin-bottom:0 !important;}
  .email-row .btn{flex:1;padding:6px 4px;font-size:12.5px;line-height:1.25;border-radius:10px;}
  .role-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:16px;}
  .role-btn{border:1.5px solid var(--line);background:#fff;border-radius:10px;padding:11px 8px;font-weight:700;font-size:14px;cursor:pointer;transition:.12s;font-family:inherit;}
  .role-btn:hover{border-color:var(--teal);}
  .role-btn.on{background:var(--teal);border-color:var(--teal);color:#fff;}
  .hint{font-size:13px;color:var(--gray);margin:-4px 0 14px;}
  .modal .btn-teal{width:100%;}

  @media(max-width:760px){
    .sel-grid{grid-template-columns:1fr;}
    .arrow{transform:rotate(90deg);padding:0;margin:-4px auto;}
    .funcs{grid-template-columns:1fr;}
    .steps{grid-template-columns:1fr 1fr;}
    .logo svg{height:128px;margin:-18px 0;}
  }