/* ============================================================
       style.css — تمام استایل‌های پروژه با متغیرهای CSS
       ============================================================ */
    :root {
      --bg-page: #f6f9fc;
      --card-bg: #ffffff;
      --card-shadow: 0 20px 40px -12px rgba(0,20,50,0.15);
      --border-radius: 24px;
      --primary: #1a2b4c;
      --primary-light: #2c3f66;
      --accent: #2b7aff;
      --accent-hover: #1a5fd9;
      --text-main: #1e2a3a;
      --text-muted: #4f5f72;
      --border-light: #e9edf4;
      --input-bg: #f0f4fc;
      --danger: #e1534f;
      --success: #1fad6b;
      --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
      --transition: 0.25s ease;
    }

   

    .card-left {
      flex: 2 1 400px;
    }

    .card-right {
      flex: 1 1 280px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      background: #fafcff;
      border-radius: 20px;
      padding: 20px 20px 30px;
      border: 1px solid var(--border-light);
    }

    h1 {
      font-size: 1.8rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 20px;
      letter-spacing: -0.3px;
    }
    h1 small {
      font-weight: 400;
      font-size: 1rem;
      color: var(--text-muted);
      display: block;
      margin-top: 4px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    label {
      display: block;
      font-weight: 500;
      font-size: 0.9rem;
      color: var(--primary-light);
      margin-bottom: 6px;
    }

    select, input {
      width: 100%;
      padding: 12px 16px;
      background: var(--input-bg);
      border: 1px solid var(--border-light);
      border-radius: 14px;
      font-size: 0.95rem;
      transition: var(--transition);
      color: var(--text-main);
      font-family: var(--font);
      outline: none;
    }

    select:focus, input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(43, 122, 255, 0.15);
      background: #fff;
    }

    .row-flex {
      display: flex;
      gap: 15px;
      flex-wrap: wrap;
    }
    .row-flex .form-group {
      flex: 1 1 140px;
    }

    .error-msg {
      background: #fee9e8;
      color: var(--danger);
      padding: 10px 14px;
      border-radius: 14px;
      font-size: 0.9rem;
      margin: 6px 0 14px;
      display: none;
      border-right: 4px solid var(--danger);
    }
    .error-msg.show {
      display: block;
    }

    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .btn {
      padding: 12px 22px;
      border: none;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      background: var(--input-bg);
      color: var(--text-main);
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      flex: 1 0 auto;
      justify-content: center;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      box-shadow: 0 6px 14px rgba(43, 122, 255, 0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(43, 122, 255, 0.3);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--border-light);
    }
    .btn-outline:hover {
      background: var(--input-bg);
    }
    .btn-success {
      background: var(--success);
      color: white;
    }
    .btn-success:hover {
      filter: brightness(0.92);
    }
    .btn-danger {
      background: var(--danger);
      color: white;
    }
    .btn-danger:hover {
      filter: brightness(0.9);
    }

    /* سمت راست: preview */
    .qr-preview-box {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .qr-canvas-wrapper {
      background: white;
      border-radius: 20px;
      padding: 16px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.03);
      border: 1px solid var(--border-light);
      margin: 10px 0 16px;
      width: 100%;
      display: flex;
      justify-content: center;
    }

    #qrCanvas {
      max-width: 100%;
      height: auto;
      image-rendering: pixelated;
      background: white;
      border-radius: 8px;
    }

    .preview-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      width: 100%;
      justify-content: center;
    }
    .preview-actions .btn {
      flex: 1 1 80px;
      font-size: 0.8rem;
      padding: 10px 12px;
    }

    .text-muted-small {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-top: 16px;
      text-align: center;
      word-break: break-all;
    }

    /* responsive */
    @media (max-width: 720px) {
      .card { padding: 20px; }
      .row-flex { flex-direction: column; }
      .row-flex .form-group { flex: 1 1 auto; }
      .btn-group .btn { flex: 1 1 100%; }
    }

    /* اسکرول‌های نرم */
    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: #eef2f7; }
    ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 8px; }