/* ----- RESET & VARIABLES (mobile-first) ----- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-dark: #1e293b;
      --primary-darker: #0f172a;
      --text-body: #334155;
      --text-light: #64748b;
      --bg-light: #f8fafc;
      --border-light: #e2e8f0;
      --accent: #3b82f6;
      --white: #ffffff;
      --soft-bg: #f1f5f9;
      --font-sans: 'Public Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    }

    body {
      font-family: var(--font-sans);
      background: #f5f5f9;  /* soft background */
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem;
      line-height: 1.5;
      color: var(--text-body);
    }

    /* main card – full width on mobile, rounded corners */
    .authentication-wrapper {
      width: 100%;
      max-width: 1300px;
      margin: 0 auto;
    }

    .authentication-inner {
      display: flex;
      flex-direction: column;  /* stacked on mobile */
      background: var(--white);
      border-radius: 0.5rem;
      overflow: hidden;
      box-shadow: 0 20px 35px -8px rgba(0,0,0,0.1);
    }

    /* LEFT IMAGE – dynamic slideshow, height controlled */
    .left-image {
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      min-height: 240px;        /* comfortable on small screens */
      width: 100%;
      transition: background-image 0.4s ease;
      background-color: #cbd5e1; /* fallback */
    }

    /* RIGHT FORM – scrollable, padding adjusted */
    .register-sect {
      padding: 1.8rem 1.5rem 2.2rem;
      width: 100%;
    }

    /* form container width: full on small, capped on larger */
    .w-px-400 {
      width: 100%;
      max-width: 400px;
      margin-left: auto;
      margin-right: auto;
    }

    /* logo */
    .app-brand {
      text-align: center;
      margin-bottom: 1.5rem;
    }
    .app-brand img {
      max-width: 220px;
      height: auto;
    }

    h4 {
      font-size: 1.7rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 1.5rem;
      line-height: 1.2;
      text-align: center;
    }

    /* form elements */
    .mb-3 {
      margin-bottom: 1.2rem;
    }

    .form-label {
      display: block;
      font-size: 0.8rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.3px;
      color: #566a7f;
      margin-bottom: 0.4rem;
    }

    .form-control {
      width: 100%;
      padding: 0.9rem 1rem;
      font-size: 1rem;
      border: 1.5px solid var(--border-light);
      border-radius: 18px;
      background: var(--bg-light);
      transition: 0.15s;
      -webkit-appearance: none;
      appearance: none;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--accent);
      background: var(--white);
      box-shadow: 0 0 0 4px rgba(59,130,246,0.15);
    }

    /* phone wrapper with prefix */
    .phone-prefix {
      display: flex;
      align-items: center;
      background: var(--bg-light);
      border: 1.5px solid var(--border-light);
      border-radius: 18px;
      overflow: hidden;
    }

    .phone-prefix span {
      background: #e9eef3;
      padding: 0.9rem 1rem;
      font-weight: 600;
      color: var(--primary-dark);
      border-right: 1.5px solid var(--border-light);
      white-space: nowrap;
      font-size: 1rem;
    }

    .phone-prefix .form-control {
      border: none;
      background: transparent;
      border-radius: 0;
      padding-left: 0.8rem;
    }

    .phone-prefix .form-control:focus {
      background: transparent;
      box-shadow: none;
    }

    /* terms row - mobile friendly tap */
    .terms-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin: 1.5rem 0 1.2rem;
      flex-wrap: wrap;
    }

    .terms-row input[type="checkbox"] {
      width: 1.3rem;
      height: 1.3rem;
      accent-color: var(--primary-dark);
      flex-shrink: 0;
    }

    .terms-row label {
      font-size: 0.95rem;
      color: var(--text-body);
    }

    .terms-row a {
      color: var(--primary-dark);
      font-weight: 600;
      text-decoration: none;
    }

    hr {
      border: none;
      border-top: 2px solid #edf2f7;
      margin: 1.5rem 0;
    }

    .text-center {
      text-align: center;
    }

    .bg-soft {
      padding: 0.6rem 1.2rem;
      border-radius: 40px;
      display: inline-block;
      font-weight: 500;
      color: var(--primary-dark);
      font-size: 0.95rem;
    }

    /* primary button – big tap area */
    .btn-primary {
      background: var(--primary-dark);
      color: white;
      border: none;
      padding: 1.1rem 1rem;
      font-size: 1.2rem;
      font-weight: 600;
      border-radius: 50px;
      width: 100%;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 8px 18px -6px rgba(30, 41, 59, 0.25);
      -webkit-tap-highlight-color: transparent;
    }

    .btn-primary:hover {
      background: var(--primary-darker);
    }
    .btn-primary:active {
      transform: scale(0.98);
    }

    /* hidden remember-me checkbox – only for cookie logic */
    .remember-hidden {
      display: none;
    }

    /* invalid feedback kept ready */
    .invalid-feedback {
      color: #dc2626;
      font-size: 0.8rem;
      margin-top: 0.3rem;
      display: none;
    }

    /* icons section if used – but we can keep hidden, just in case */
    .icons-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 0.75rem;
      margin: 2rem 0 1rem;
    }
    .icon-wrapper {
      width: 2.8rem;
      height: 2.8rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
    }
    /* small screen adjustment: register-sect padding less */
    @media (max-width: 380px) {
      .register-sect {
        padding: 1.2rem 1rem 1.8rem;
      }
      .phone-prefix span {
        padding: 0.9rem 0.7rem;
        font-size: 0.9rem;
      }
      h4 {
        font-size: 1.3rem;
      }
    }

    /* tablet and up – side by side */
    @media (min-width: 768px) {
      body {
        padding: 1.5rem;
      }
      .authentication-inner {
        flex-direction: row;
        min-height: 650px;
      }
      .left-image {
        flex: 1 1 45%;
        min-height: 100%;
        height: auto;
      }
      .register-sect {
        flex: 1 1 55%;
        padding: 2.5rem 2rem;
        display: flex;
        align-items: center;
      }
      .w-px-400 {
        max-width: 420px;
      }
      .app-brand img {
        max-width: 260px;
      }
      h4 {
        text-align: left;
        font-size: 1.4rem;
      }
    }

    /* large desktop fine-tuning */
    @media (min-width: 1200px) {
      .left-image {
        flex: 1 1 45%;
      }
      .register-sect {
        flex: 1 1 45%;
      }
    }

    /* image container legacy – we adapt but not needed for main */
    .image-container {
      display: none; /* we use left-image */
    }