:root {
      --primary: #6c5ce7;
      --primary-dark: #5a4bd1;
      --secondary: #00cec9;
      --accent: #fd79a8;
      --bg: #f8f9fe;
      --surface: #ffffff;
      --text: #2d3436;
      --text-light: #636e72;
      --border: #e0e3eb;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(108,92,231,0.12);
      --shadow-lg: 0 20px 50px rgba(0,0,0,0.08);
      --radius-xl: 28px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      background: linear-gradient(165deg, #eef0fd 0%, #fdf2f8 50%, #f0f4ff 100%);
      background-attachment: fixed;
      font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    /* ---------- PROFESSIONAL HEADER ---------- */
    .main-header {
      width: 100%;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(108,92,231,0.1);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 4px 20px rgba(108,92,231,0.06);
    }

    .header-container {
      max-width: 1200px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 28px;
      height: 72px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 14px;
      font-weight: 800;
      font-size: 1.7rem;
      background: linear-gradient(135deg, #6c5ce7, #a29bfe);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }
    .logo-img {
      height: 48px;
      width: auto;
      display: block;
      filter: drop-shadow(0 4px 8px rgba(108,92,231,0.3));
      background: transparent;
      mix-blend-mode: multiply;
      -webkit-mix-blend-mode: multiply;
    }
    .logo-fallback {
      display: none;
      background: linear-gradient(135deg, #6c5ce7, #00cec9);
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 14px;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      box-shadow: 0 8px 18px rgba(108,92,231,0.3);
    }

    /* Desktop nav */
    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .desktop-nav a {
      text-decoration: none;
      color: var(--text);
      font-weight: 600;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
      transition: color var(--transition);
    }
    .desktop-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      border-radius: 10px;
      transition: width var(--transition);
    }
    .desktop-nav a:hover {
      color: var(--primary);
    }
    .desktop-nav a:hover::after {
      width: 100%;
    }

    /* Hamburger - hidden on desktop */
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text);
      cursor: pointer;
      padding: 8px 12px;
      border-radius: 12px;
      transition: background 0.2s;
      z-index: 110;
    }
    .hamburger:hover {
      background: rgba(108,92,231,0.08);
    }

    /* Mobile menu */
    .mobile-menu {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      flex-direction: column;
      padding: 16px 28px 24px;
      gap: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.1);
      border-radius: 0 0 24px 24px;
      list-style: none;
      border-bottom: 1px solid #eee;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      text-decoration: none;
      color: var(--text);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 10px 14px;
      border-radius: 12px;
      transition: background 0.2s;
    }
    .mobile-menu a:hover {
      background: #f1f0ff;
      color: var(--primary);
    }

    /* ---------- MAIN TOOL CARD ---------- */
    .container {
      width: 100%;
      max-width: 880px;
      margin: 28px 20px;
      background: var(--surface);
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-lg), 0 0 0 1px rgba(108,92,231,0.08);
      padding: 32px 28px 28px;
      transition: all var(--transition);
      position: relative;
      overflow: hidden;
    }
    .container::before {
      content: '';
      position: absolute;
      top: -60px;
      right: -60px;
      width: 200px;
      height: 200px;
      background: radial-gradient(circle, rgba(108,92,231,0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .tool-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 6px;
    }
    .tool-header i {
      font-size: 2.2rem;
      color: var(--primary);
      background: linear-gradient(135deg, #f1f0ff, #e8e6ff);
      padding: 12px;
      border-radius: 18px;
    }
    .tool-header h2 {
      font-size: 2rem;
      font-weight: 800;
      background: linear-gradient(135deg, #2d3436, #6c5ce7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .subtitle {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 24px;
      color: var(--text-light);
      font-weight: 500;
      padding-left: 16px;
      border-left: 4px solid var(--primary);
      font-size: 0.95rem;
    }

    .upload-area {
      background: #fafbff;
      border: 2px dashed #d4d8f0;
      border-radius: var(--radius-lg);
      padding: 18px 20px;
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      transition: all var(--transition);
      background: linear-gradient(135deg, #ffffff, #f9f9ff);
    }
    .upload-area:hover {
      border-color: var(--primary);
      background: #fdfdff;
    }
    .file-label {
      background: var(--primary);
      color: white;
      padding: 12px 26px;
      border-radius: 40px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      box-shadow: 0 8px 22px rgba(108,92,231,0.35);
      transition: all var(--transition);
      letter-spacing: 0.3px;
    }
    .file-label:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(108,92,231,0.4);
    }
    #fileInput {
      display: none;
    }
    .file-info {
      background: white;
      padding: 8px 18px;
      border-radius: 30px;
      display: flex;
      align-items: center;
      gap: 8px;
      box-shadow: var(--shadow-sm);
      font-size: 0.9rem;
    }
    .clear-file-btn {
      background: none;
      border: none;
      color: #888;
      cursor: pointer;
      padding: 6px;
      border-radius: 50%;
    }

    textarea {
      width: 100%;
      height: 170px;
      border: 2px solid #e8ecf4;
      border-radius: var(--radius-lg);
      padding: 18px;
      font-family: 'JetBrains Mono', 'Fira Code', monospace;
      font-size: 0.95rem;
      resize: vertical;
      outline: none;
      transition: var(--transition);
      background: #fcfcff;
      margin-bottom: 18px;
      color: #2d3436;
    }
    textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 5px rgba(108,92,231,0.08);
      background: white;
    }

    .action-row {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      justify-content: space-between;
      margin: 4px 0 18px;
    }
    .btn-group {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }
    .btn {
      border: none;
      padding: 13px 26px;
      border-radius: 40px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      transition: all var(--transition);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 10px 24px rgba(108,92,231,0.4);
    }
    .btn-primary i {
      color: #ffeaa7;
    }
    .btn-primary:hover {
      background: #5a4bd1;
      transform: scale(1.03);
    }
    .btn-outline {
      background: white;
      border: 2px solid #e0e3eb;
      color: var(--text);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: #f8f7ff;
    }
    .copy-all-btn {
      background: linear-gradient(135deg, #00cec9, #00b894);
      color: white;
      border: none;
      padding: 13px 24px;
      border-radius: 40px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(0,206,201,0.35);
      transition: all var(--transition);
    }
    .copy-all-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 26px rgba(0,206,201,0.5);
    }

    .badge {
      background: #f0edff;
      color: var(--primary);
      padding: 8px 20px;
      border-radius: 30px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .email-list {
      background: #f9faff;
      border-radius: var(--radius-lg);
      padding: 18px;
      max-height: 260px;
      overflow-y: auto;
      border: 1px solid #eae6ff;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-content: flex-start;
      box-shadow: inset 0 2px 10px rgba(0,0,0,0.02);
    }
    .email-chip {
      background: white;
      border: 1px solid #e4e0ff;
      padding: 10px 18px;
      border-radius: 30px;
      font-family: monospace;
      display: flex;
      align-items: center;
      gap: 10px;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
      font-size: 0.9rem;
      color: #2d3436;
    }
    .email-chip i {
      color: var(--primary);
    }
    .empty-state {
      color: #999;
      width: 100%;
      text-align: center;
      padding: 24px;
      font-style: italic;
    }

    /* info & faq cards */
    .info-section, .faq-section {
      max-width: 880px;
      margin: 8px 20px 18px;
      background: white;
      border-radius: var(--radius-xl);
      padding: 28px;
      box-shadow: var(--shadow-md);
      border: 1px solid #f0edff;
    }
    .info-section h3, .faq-section h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 14px;
      color: #2d3436;
    }

    /* ----- ACCORDION FAQ STYLES (Professional, no emojis) ----- */
    .faq-accordion {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .faq-card {
      background: #fafbff;
      border: 1px solid #ede9fe;
      border-radius: 18px;
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text);
      cursor: pointer;
      text-align: left;
      gap: 16px;
      font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    }
    .faq-question i {
      color: var(--primary);
      font-size: 1.2rem;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: white;
      padding: 0 22px;
      color: var(--text-light);
      line-height: 1.6;
    }
    .faq-card.open .faq-answer {
      max-height: 120px;
      padding: 0 22px 18px;
    }
    .faq-card.open .faq-question i {
      transform: rotate(180deg);
    }

    .footer {
      width: 100%;
      background: #1e1e2f;
      color: #ccc;
      text-align: center;
      padding: 22px;
      font-weight: 500;
      margin-top: 10px;
    }

    /* Responsive */
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger {
        display: flex;
        align-items: center;
      }
      .container {
        padding: 22px 18px;
      }
      .btn {
        padding: 12px 20px;
      }
    }