/* --- CORE VARIABLES & RESET --- */
    :root {
      --primary-blue: #3a86ff;
      --glass-bg: rgba(0, 0, 0, 0.7);
      --glass-border: rgba(58, 134, 255, 0.5);
    }

    body {
      margin: 0;
      font-family: 'Roboto', sans-serif;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: white;
      background: black;
      overflow-x: hidden; /* Prevent horizontal scroll */
      overflow-y: auto;   /* Allow vertical scroll for small screens/keyboards */
      position: relative;
    }

    /* --- BACKGROUND ANIMATION ELEMENTS --- */
    #stars {
      position: fixed;
      inset: 0;
      z-index: -2;
      pointer-events: none;
    }
    
    .star {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.8;
    }

    .black-hole-container {
      position: fixed;
      inset: 0;
      display: grid;
      place-items: center;
      z-index: -1;
      transform: translateY(-50px);
      pointer-events: none;
    }

    .event-horizon {
      width: 140px;
      height: 140px;
      border-radius: 50%;
      background: black;
      box-shadow: 0 0 80px rgba(58, 134, 255, 0.4);
      position: relative;
      z-index: 2;
    }

    .photon-ring {
      position: absolute;
      width: 190px;
      height: 190px;
      border-radius: 50%;
      background: conic-gradient(
        rgba(255, 255, 255, 0.1), 
        var(--primary-blue), 
        rgba(255, 255, 255, 0.1)
      );
      filter: blur(8px);
      animation: pulse 4s ease-in-out infinite;
      z-index: 1;
    }

    .accretion-disk {
      position: absolute;
      width: 600px;
      height: 200px;
      border-radius: 50%;
      background: radial-gradient(transparent 40%, rgba(58, 134, 255, 0.6) 60%, transparent 70%);
      filter: blur(15px);
      transform: rotateX(75deg);
      animation: spin 12s linear infinite;
      z-index: 3;
      box-shadow: 0 0 30px var(--primary-blue);
    }

    @keyframes spin {
      from { transform: rotateX(75deg) rotate(0deg); }
      to { transform: rotateX(75deg) rotate(360deg); }
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); opacity: 0.8; }
      50% { transform: scale(1.05); opacity: 1; }
    }

    /* --- FORM CONTAINER --- */
    .form-container {
      width: 90%;
      max-width: 440px;
      padding: 30px 40px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-radius: 20px;
      border: 1px solid var(--glass-border);
      box-shadow: 0 0 60px rgba(0, 0, 0, 0.8);
      text-align: center;
      position: relative;
      z-index: 10;
      margin: 40px 0; /* Add margin so it doesn't touch edges on scroll */
      animation: fadeIn 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(40px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* Logo inside form */
    .form-logo {
      width: 80px;
      height: auto;
      margin-bottom: 10px;
      filter: drop-shadow(0 0 8px rgba(58, 134, 255, 0.5));
      transition: transform 0.3s ease;
    }

    .form-logo:hover {
      transform: scale(1.05);
    }

    h1 {
      font-family: 'Orbitron', sans-serif;
      letter-spacing: 3px;
      margin-bottom: 5px;
      color: white;
      font-size: 2rem;
      animation: glow 4s ease-in-out infinite;
    }

    @keyframes glow {
      0%, 100% { text-shadow: 0 0 10px rgba(58, 134, 255, 0.4); }
      50% { text-shadow: 0 0 25px rgba(58, 134, 255, 0.9); }
    }

    .subtitle {
      color: var(--primary-blue);
      margin-bottom: 25px;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      font-size: 0.85rem;
    }

    /* --- INPUTS --- */
    .input-group {
      margin-bottom: 18px;
      text-align: left;
    }

    .input-group label {
      font-size: 0.75rem;
      color: #aaa;
      margin-bottom: 6px;
      display: block;
      margin-left: 5px;
      font-family: 'Orbitron', sans-serif;
      letter-spacing: 1px;
    }

    .input-group input, 
    .input-group select {
      width: 100%;
      box-sizing: border-box;
      padding: 12px 14px;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(58, 134, 255, 0.3);
      border-radius: 8px;
      color: white;
      font-family: 'Orbitron', sans-serif;
      font-size: 0.9rem;
      outline: none;
      transition: all 0.3s ease;
    }

    .input-group input:focus, 
    .input-group select:focus {
      border-color: var(--primary-blue);
      background: rgba(58, 134, 255, 0.05);
      box-shadow: 0 0 20px rgba(58, 134, 255, 0.2);
    }

    ::placeholder {
      color: rgba(255, 255, 255, 0.2);
      font-family: 'Roboto', sans-serif;
    }

    /* Select Dropdown Styling */
    .input-group select {
      appearance: none;
      background-image: linear-gradient(45deg, transparent 50%, var(--primary-blue) 50%), 
                        linear-gradient(135deg, var(--primary-blue) 50%, transparent 50%);
      background-position: calc(100% - 15px) calc(50%), calc(100% - 10px) calc(50%);
      background-size: 5px 5px, 5px 5px;
      background-repeat: no-repeat;
      cursor: pointer;
    }

    select option {
      background: #050505;
      color: var(--primary-blue);
    }

    /* --- BUTTON --- */
    button {
      margin-top: 10px;
      width: 100%;
      padding: 16px;
      font-family: 'Orbitron', sans-serif;
      font-weight: bold;
      font-size: 1rem;
      letter-spacing: 2px;
      background: var(--primary-blue);
      color: black;
      border: none;
      cursor: pointer;
      clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-transform: uppercase;
    }

    button:hover {
      background: white;
      color: var(--primary-blue);
      box-shadow: 0 0 40px var(--primary-blue);
      transform: translateY(-2px);
    }

    /* --- FOOTER --- */
    .footer {
      width: 100%;
      text-align: center;
      padding: 10px 0 20px 0;
      color: rgba(255, 255, 255, 0.3);
      font-size: 0.7rem;
      font-family: 'Orbitron', sans-serif;
      letter-spacing: 1px;
      z-index: 10;
    }

    /* --- POPUP --- */
    #popupMessage {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%) translateY(-20px);
      padding: 12px 24px;
      background: rgba(58, 134, 255, 0.95);
      color: black;
      font-family: 'Orbitron', sans-serif;
      font-weight: bold;
      border-radius: 8px;
      box-shadow: 0 0 30px rgba(58, 134, 255, 0.6);
      opacity: 0;
      pointer-events: none;
      transition: all 0.4s ease;
      z-index: 100;
      white-space: nowrap;
      font-size: 0.9rem;
    }

    #popupMessage.show {
      opacity: 1;
      transform: translateX(-50%) translateY(0);
    }
    
    #popupMessage.error {
      background: rgba(255, 58, 58, 0.95);
      box-shadow: 0 0 40px rgba(255, 58, 58, 0.6);
    }

    /* --- MOBILE RESPONSIVENESS --- */
    @media (max-width: 600px) {
      .form-container {
        width: 95%;
        padding: 25px 20px;
        margin: 20px 0;
      }

      /* Scale down the black hole to fit phone screens */
      .accretion-disk { width: 320px; height: 120px; }
      .photon-ring { width: 140px; height: 140px; }
      .event-horizon { width: 100px; height: 100px; }
      
      h1 { font-size: 1.6rem; }
      .form-logo { width: 60px; }
      
      .black-hole-container {
        /* Move it up slightly so it doesn't overlap inputs visually */
        transform: translateY(-80px); 
      }
    }

/* --- CHECKBOX & NOTE STYLING --- */
.checkbox-container {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  text-align: left;
  font-size: 0.8rem;
  color: #ddd;
  padding: 0 5px;
}

.checkbox-container input[type="checkbox"] {
  min-width: 16px;
  min-height: 16px;
  margin-top: 2px;
  /* Uses your primary blue color */
  accent-color: #3a86ff; 
  cursor: pointer;
}

.checkbox-container label {
  line-height: 1.4;
  cursor: pointer;
  font-size: 0.85rem;
}

.note-text {
  font-size: 0.75rem;
  color: #aaa;
  margin-top: 20px;
  line-height: 1.5;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 15px;
}

.note-text a {
  color: #3a86ff;
  text-decoration: none;
  border-bottom: 1px dotted #3a86ff;
  transition: all 0.2s;
}

.note-text a:hover {
  color: white;
  border-bottom-style: solid;
}