/* ---------- Design system ---------- */
  :root{
    --bg:        #F4F6F5;
    --surface:   #FFFFFF;
    --ink:       #16201C;
    --muted:     #64726C;
    --line:      #E1E6E3;
    --accent:    #0E9F6E;
    --accent-strong: #0A7D55;
    --accent-soft:   #E7F4EE;
    --bar:       #1B2621;
    --bar-text:  #9FBBAE;
    --bar-num:   #57D9A3;
    --radius:    14px;
    --shadow:    0 1px 2px rgba(22,32,28,.05), 0 12px 30px -18px rgba(22,32,28,.25);
    --font-display: "Space Grotesk", system-ui, sans-serif;
    --font-body:    "Inter", system-ui, sans-serif;
    --font-mono:    "JetBrains Mono", ui-monospace, monospace;
  }

  *{ box-sizing:border-box; }

  html,body{ margin:0; padding:0; }

  body{
    background:var(--bg);
    color:var(--ink);
    font-family:var(--font-body);
    font-size:16px;
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
  }

  .wrap{
    width:100%;
    max-width:760px;
    margin:0 auto;
    padding:20px 16px 40px;
  }

  /* ---------- Header ---------- */
  header.masthead{
    text-align:center;
    padding:16px 4px 4px;
  }
  .eyebrow{
    display:inline-block;
    font-family:var(--font-mono);
    font-size:.72rem;
    letter-spacing:.16em;
    text-transform:uppercase;
    color:var(--accent-strong);
    background:var(--accent-soft);
    padding:5px 12px;
    border-radius:999px;
    margin-bottom:14px;
  }
  h1{
    font-family:var(--font-display);
    font-weight:700;
    font-size:clamp(1.7rem, 6vw, 2.5rem);
    line-height:1.1;
    letter-spacing:-.02em;
    margin:0 0 10px;
  }
  .subtitle{
    color:var(--muted);
    font-size:1rem;
    max-width:46ch;
    margin:0 auto;
  }

  /* ---------- Ad slots ---------- */
  .ad-slot{
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    min-height:96px;
    margin:26px 0;
    padding:16px;
    border:2px dashed #C3CBC7;
    border-radius:12px;
    background:repeating-linear-gradient(45deg, #FAFBFB, #FAFBFB 12px, #F4F6F5 12px, #F4F6F5 24px);
    color:#98A29D;
    font-family:var(--font-mono);
    font-size:.82rem;
    letter-spacing:.02em;
  }

  /* ---------- Main card / editor ---------- */
  .card{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
    padding:18px;
  }

  .editor{
    border:1px solid var(--line);
    border-radius:12px;
    overflow:hidden;
    background:var(--surface);
  }
  textarea#input{
    display:block;
    width:100%;
    min-height:230px;
    resize:vertical;
    border:0;
    outline:0;
    padding:16px;
    font-family:var(--font-body);
    font-size:1.02rem;
    line-height:1.6;
    color:var(--ink);
    background:transparent;
  }
  textarea#input::placeholder{ color:#AAB4AF; }
  .editor:focus-within{
    border-color:var(--accent);
    box-shadow:0 0 0 3px var(--accent-soft);
  }

  /* Editor-style status bar: live counter */
  .statusbar{
    display:flex;
    flex-wrap:wrap;
    gap:8px 18px;
    align-items:center;
    background:var(--bar);
    padding:10px 14px;
    font-family:var(--font-mono);
    font-size:.8rem;
    color:var(--bar-text);
  }
  .statusbar .stat b{
    color:var(--bar-num);
    font-weight:600;
  }
  .statusbar .dot{
    width:6px; height:6px; border-radius:50%;
    background:var(--accent);
    display:inline-block;
    margin-right:6px;
    vertical-align:middle;
  }

  /* ---------- Buttons ---------- */
  .group-label{
    font-size:.75rem;
    font-weight:600;
    letter-spacing:.06em;
    text-transform:uppercase;
    color:var(--muted);
    margin:20px 2px 10px;
  }
  .btn-row{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
  }
  .btn{
    appearance:none;
    border:1px solid var(--line);
    background:var(--surface);
    color:var(--ink);
    font-family:var(--font-body);
    font-size:.92rem;
    font-weight:500;
    padding:11px 15px;
    border-radius:10px;
    cursor:pointer;
    transition:background .15s ease, border-color .15s ease, transform .05s ease, color .15s ease;
    flex:1 1 auto;
    min-width:140px;
  }
  .btn:hover{
    background:var(--accent-soft);
    border-color:var(--accent);
    color:var(--accent-strong);
  }
  .btn:active{ transform:translateY(1px); }
  .btn:focus-visible{
    outline:3px solid var(--accent-soft);
    outline-offset:2px;
    border-color:var(--accent);
  }

  .utility-row{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
    margin-top:14px;
  }
  .translate-row{
    display:flex;
    flex-wrap:wrap;
    gap:10px;
  }
  #targetLang{
    flex:1 1 200px;
    appearance:none;
    border:1px solid var(--line);
    background:var(--surface);
    color:var(--ink);
    font-family:var(--font-body);
    font-size:.95rem;
    padding:11px 38px 11px 14px;
    border-radius:10px;
    cursor:pointer;
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2364726C' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat:no-repeat;
    background-position:right 13px center;
  }
  #targetLang:focus-visible{
    outline:3px solid var(--accent-soft);
    outline-offset:2px;
    border-color:var(--accent);
  }
  .btn-translate{
    flex:1 1 160px;
    background:var(--ink);
    border-color:var(--ink);
    color:#fff;
    font-weight:600;
  }
  .btn-translate:hover{
    background:#0d1512;
    border-color:#0d1512;
    color:#fff;
  }
  .btn-translate:disabled{
    opacity:.6;
    cursor:progress;
  }
  .btn-primary{
    flex:2 1 220px;
    background:var(--accent);
    border-color:var(--accent);
    color:#fff;
    font-weight:600;
    font-size:1rem;
    padding:14px 18px;
  }
  .btn-primary:hover{
    background:var(--accent-strong);
    border-color:var(--accent-strong);
    color:#fff;
  }
  .btn-ghost{
    flex:1 1 130px;
    background:var(--surface);
    color:var(--muted);
    font-weight:500;
  }
  .btn-ghost:hover{
    background:#FBEFEF;
    border-color:#E7B7B7;
    color:#B4443E;
  }
  #undoBtn{ flex:1 1 130px; }
  #undoBtn:hover:not(:disabled){
    background:var(--accent-soft);
    border-color:var(--accent);
    color:var(--accent-strong);
  }
  #undoBtn:disabled{
    opacity:.45;
    cursor:not-allowed;
  }

  /* ---------- Help / content section ---------- */
  .guide{
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:var(--radius);
    padding:22px 20px;
  }
  .guide h2{
    font-family:var(--font-display);
    font-size:1.25rem;
    margin:0 0 14px;
    letter-spacing:-.01em;
  }
  .guide dl{ margin:0; }
  .guide dt{
    font-weight:600;
    margin-top:14px;
    color:var(--ink);
  }
  .guide dt:first-of-type{ margin-top:0; }
  .guide dd{
    margin:2px 0 0;
    color:var(--muted);
    font-size:.95rem;
  }

  /* ---------- Footer ---------- */
  footer.foot{
    text-align:center;
    color:var(--muted);
    font-size:.85rem;
    padding:24px 8px 4px;
  }
  footer.foot a{ color:var(--accent-strong); text-decoration:none; }
  .foot-links{ margin-bottom:8px; }
  .foot-links a:hover{ text-decoration:underline; }
  .foot-links .sep{ margin:0 8px; opacity:.5; }

  /* ---------- "Copied" toast ---------- */
  #toast{
    position:fixed;
    left:50%;
    bottom:24px;
    transform:translateX(-50%) translateY(20px);
    background:var(--ink);
    color:#fff;
    padding:12px 20px;
    border-radius:999px;
    font-size:.9rem;
    font-weight:500;
    box-shadow:0 10px 30px -8px rgba(0,0,0,.4);
    opacity:0;
    pointer-events:none;
    transition:opacity .25s ease, transform .25s ease;
    z-index:50;
  }
  #toast.show{
    opacity:1;
    transform:translateX(-50%) translateY(0);
  }

  @media (max-width:480px){
    .btn{ min-width:0; flex:1 1 calc(50% - 5px); }
    .ad-slot{ font-size:.74rem; }
  }

  @media (prefers-reduced-motion:reduce){
    *{ transition:none !important; }
  }
  /* ---------- Top navigation (multi-page) ---------- */
  .nav{
    background:var(--surface);
    border-bottom:1px solid var(--line);
    position:sticky; top:0; z-index:20;
  }
  .nav-inner{
    max-width:760px; margin:0 auto; padding:12px 16px;
    display:flex; align-items:center; gap:10px 18px; flex-wrap:wrap;
  }
  .nav-brand{
    font-family:var(--font-display); font-weight:700; font-size:1.05rem;
    color:var(--ink); text-decoration:none; letter-spacing:-.01em; margin-right:4px;
  }
  .nav-brand span{ color:var(--accent); }
  .nav-links{ display:flex; gap:6px 6px; flex-wrap:wrap; }
  .nav-links a{
    font-size:.85rem; font-weight:500; color:var(--muted); text-decoration:none;
    padding:6px 11px; border-radius:999px; transition:background .15s ease,color .15s ease;
    white-space:nowrap;
  }
  .nav-links a:hover{ background:var(--accent-soft); color:var(--accent-strong); }
  .nav-links a.active{ background:var(--ink); color:#fff; }

  /* ---------- SEO content blocks ---------- */
  .prose{
    background:var(--surface); border:1px solid var(--line); border-radius:var(--radius);
    padding:24px 22px; margin-top:26px;
  }
  .prose h2{
    font-family:var(--font-display); font-weight:600; font-size:1.25rem;
    margin:0 0 12px; letter-spacing:-.01em;
  }
  .prose h3{
    font-family:var(--font-display); font-weight:600; font-size:1.05rem; margin:22px 0 6px;
  }
  .prose p{ margin:0 0 14px; color:#33403A; }
  .prose ol,.prose ul{ margin:0 0 14px; padding-left:22px; color:#33403A; }
  .prose li{ margin-bottom:6px; }

  /* ---------- Other tools grid ---------- */
  .tools-grid{
    display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:12px; margin-top:26px;
  }
  .tool-card{
    display:block; background:var(--surface); border:1px solid var(--line);
    border-radius:12px; padding:16px 18px; text-decoration:none; color:var(--ink);
    transition:border-color .15s ease, box-shadow .15s ease, transform .06s ease;
  }
  .tool-card:hover{ border-color:var(--accent); box-shadow:var(--shadow); }
  .tool-card:active{ transform:translateY(1px); }
  .tool-card .t-name{ font-family:var(--font-display); font-weight:600; font-size:1rem; display:block; margin-bottom:3px; }
  .tool-card .t-desc{ font-size:.85rem; color:var(--muted); }