:root {
        --primary: #4361ee;
        --primary-dark: #3a56d4;
        --secondary: #7209b7;
        --accent: #f72585;
        --light: #f8f9fa;
        --dark: #212529;
        --success: #4cc9f0;
        --danger: #f72585;
        --gray: #6c757d;
        --border-radius: 12px;
        --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        --transition: all 0.3s ease;
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --glass: rgba(255,255,255,0.08);
        --accent: #6366f1;
        --accent-hover: #818cf8;
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --danger: #ef4444;
        --success: #10b981;
        --radius: 16px;
        --shadow: 0 8px 32px rgba(0,0,0,0.2);
      }

      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Inter', -apple-system, sans-serif;
      }

      body {
        background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
        color: var(--text-primary);
        min-height: 100vh;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 2rem;
      }

      .container {
        max-width: 800px;
        width: 100%;
        background: rgba(255,255,255,0.05);
        backdrop-filter: blur(16px);
        border: 1px solid rgba(255,255,255,0.1);
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 2.5rem;
      }

      h1 {
        background: linear-gradient(to right, var(--accent), var(--accent-hover));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        font-size: 2.5rem;
        text-align: center;
        margin-bottom: 2rem;
      }

      .card {
        background: rgba(255,255,255,0.03);
        border: 1px solid rgba(255,255,255,0.05);
        border-radius: var(--radius);
        padding: 2rem;
        margin-bottom: 2rem;
      }

      .card-title {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
        color: var(--primary);
        display: flex;
        align-items: center;
        gap: 0.5rem;
      }

      .card-title i {
        color: var(--accent);
      }

      .input-group {
        display: flex;
        flex-direction: column;
        gap: 1rem;
      }

      .input-row {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        width: 100%;
      }

      .input-row input[type="number"] {
        flex: 1 1 auto;
        min-width: 140px;
      }

      label {
        color: var(--text-secondary);
        font-weight: 500;
        min-width: 150px;
      }

      input[type="number"] {
        background: rgba(255,255,255,0.03);
        border: 1px solid rgba(255,255,255,0.1);
        color: var(--text-primary);
        padding: 0.75rem 1rem;
        border-radius: var(--radius);
        width: 100%;
        transition: all 0.3s ease;
      }

      input[type="number"]:focus {
        outline: none;
        border-color: var(--accent);
        box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
      }

      /* Remove native number input spinner/arrows */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield; /* Firefox */
}

      .btn-group {
        display: flex;
        gap: 0.5rem;
        align-items: center;
        justify-content: flex-end;
        flex: 0 0 auto;
      }

      /* Ensure buttons sit side-by-side and don't force full width */
      button {
        padding: 0.75rem 1.25rem;
        border: none;
        border-radius: var(--radius);
        font-weight: 500;
        cursor: pointer;
        transition: all 0.3s ease;
        min-width: 120px;
        flex: 0 0 auto;
      }

      #btn {
        background: var(--accent);
        color: white;
      }

      #btn:hover {
        background: var(--accent-hover);
        transform: translateY(-2px);
      }

      .clearbtn {
        background: var(--danger);
        color: white;
      }

      .copy-btn {
        background: var(--success);
        color: white;
      }

      .display {
        margin-top: 2rem;
      }

      .password-list {
        max-height: 300px;
        overflow-y: auto;
        padding-right: 0.5rem;
      }

      .password-list::-webkit-scrollbar {
        width: 6px;
      }

      .password-list::-webkit-scrollbar-track {
        background: rgba(255,255,255,0.03);
        border-radius: 3px;
      }

      .password-list::-webkit-scrollbar-thumb {
        background: var(--accent);
        border-radius: 3px;
      }

      .output {
        background: rgba(255,255,255,0.03);
        border: 1px solid rgba(255,255,255,0.05);
        padding: 1rem;
        border-radius: var(--radius);
        margin-bottom: 1rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        transition: all 0.3s ease;
      }

      .output:hover {
        background: rgba(255,255,255,0.05);
        transform: translateY(-2px);
      }

      .empty-state {
        text-align: center;
        color: var(--text-secondary);
        padding: 2rem;
      }

      .empty-state i {
        font-size: 3rem;
        margin-bottom: 1rem;
        color: #dee2e6;
      }

      footer {
        color: white;
        text-align: center;
        padding: 1rem;
        margin-top: auto;
        font-size: 0.9rem;
        opacity: 0.8;
      }

      /* Responsive Design */
      @media (max-width: 768px) {
        .container {
          padding: 1.5rem;
        }
        
        .input-row {
          flex-direction: column;
          align-items: flex-start;
        }
        
        label {
          min-width: auto;
          margin-bottom: 0.5rem;
        }
        
        /* keep buttons on the same row on most mobile widths;
           they will wrap only if there's not enough space */
        .btn-group {
          flex-direction: row;
          gap: 0.5rem;
        }
      }