:root {
      --bg: #f2faf4;
      --card: #ffffff;
      --primary: #4caf70;
      --primary-dark: #348953;
      --primary-soft: #dff4e5;
      --border: #cfe8d5;
      --text: #213328;
      --muted: #688071;
      --danger: #c45656;
      --shadow: 0 10px 30px rgba(50, 100, 65, 0.08);
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: linear-gradient(135deg, #effaf1, #e5f6e9);
      color: var(--text);
    }

    .container {
      width: min(1000px, calc(100% - 32px));
      margin: 36px auto;
    }

    header {
      margin-bottom: 24px;
    }

    h1 {
      margin: 0 0 8px;
      font-size: clamp(28px, 4vw, 40px);
      line-height: 1.1;
    }

    .subtitle {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
    }

    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 18px;
      padding: 20px;
      box-shadow: var(--shadow);
    }

    .card.wide {
      grid-column: 1 / -1;
    }

    h2 {
      margin: 0 0 6px;
      font-size: 20px;
    }

    .description {
      margin: 0 0 18px;
      color: var(--muted);
      font-size: 14px;
    }

    .fields {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-bottom: 14px;
    }

    .fields.three {
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    label {
      display: block;
      font-size: 13px;
      color: var(--muted);
      margin-bottom: 6px;
      font-weight: 600;
    }

    input, textarea {
      width: 100%;
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 11px 12px;
      font: inherit;
      color: var(--text);
      background: #fbfefb;
      outline: none;
      transition: border-color .15s, box-shadow .15s;
    }

    input:focus, textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(76, 175, 112, .14);
    }

    textarea {
      min-height: 110px;
      resize: vertical;
    }

    button {
      border: 0;
      border-radius: 10px;
      padding: 11px 15px;
      font: inherit;
      font-weight: 700;
      color: white;
      background: var(--primary);
      cursor: pointer;
      transition: background .15s, transform .05s;
    }

    button:hover { background: var(--primary-dark); }
    button:active { transform: translateY(1px); }

    .secondary {
      color: var(--primary-dark);
      background: var(--primary-soft);
    }

    .secondary:hover {
      background: #ccebd5;
    }

    .actions {
      display: flex;
      gap: 9px;
      flex-wrap: wrap;
    }

    .result {
      margin-top: 14px;
      padding: 16px;
      min-height: 60px;
      border-radius: 12px;
      background: #f5fbf6;
      border: 1px dashed var(--border);
      font-size: 22px;
      font-weight: 800;
      word-break: break-word;
      white-space: pre-wrap;
    }

    .result.small {
      font-size: 16px;
      line-height: 1.5;
      max-height: 280px;
      overflow: auto;
    }

    .hint {
      margin-top: 9px;
      color: var(--muted);
      font-size: 12px;
    }

    .error {
      color: var(--danger);
      font-size: 13px;
      margin-top: 8px;
      min-height: 18px;
    }

    .badge {
      display: inline-block;
      margin-bottom: 10px;
      padding: 5px 9px;
      border-radius: 999px;
      background: var(--primary-soft);
      color: var(--primary-dark);
      font-size: 12px;
      font-weight: 800;
    }

    footer {
      margin-top: 18px;
      text-align: center;
      color: var(--muted);
      font-size: 12px;
    }

    @media (max-width: 720px) {
      .grid { grid-template-columns: 1fr; }
      .card.wide { grid-column: auto; }
      .fields, .fields.three { grid-template-columns: 1fr; }
      .container { margin: 22px auto; }
    }