:root {
      --primary: #6366f1;
      --primary-dark: #4f46e5;
      --secondary: #ec4899;
      --dark: #0f172a;
      --darker: #070b15;
      --card: #1e293b;
      --card-hover: #2d3748;
      --text: #f1f5f9;
      --text-muted: #94a3b8;
      --success: #10b981;
      --error: #ef4444;
      --glass: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --radius: 16px;
      --radius-sm: 8px;
      --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: 'Poppins', sans-serif;
      background: linear-gradient(135deg, var(--darker), var(--dark));
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* Animated Background */
    .bg-animation {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      overflow: hidden;
    }

    .bg-animation span {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.4;
    }

    .bg-animation .circle-1 {
      width: 400px;
      height: 400px;
      background: var(--primary);
      top: 10%;
      left: 5%;
      animation: float 15s infinite ease-in-out;
    }

    .bg-animation .circle-2 {
      width: 600px;
      height: 600px;
      background: var(--secondary);
      bottom: 10%;
      right: 5%;
      animation: float 20s infinite ease-in-out reverse;
    }

    /* Login Container */
    .login-container {
      width: 100%;
      max-width: 420px;
      padding: 20px;
    }

    .login-card {
      background: rgba(30, 41, 59, 0.8);
      backdrop-filter: blur(20px);
      border-radius: var(--radius);
      padding: 40px 30px;
      border: 1px solid var(--glass-border);
      box-shadow: var(--shadow);
      text-align: center;
    }

    .logo {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-bottom: 30px;
    }

    .logo-icon {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      color: white;
      box-shadow: var(--shadow);
    }

    .logo-text h1 {
      font-size: 22px;
      font-weight: 700;
      background: linear-gradient(to right, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .logo-text p {
      font-size: 12px;
      color: var(--text-muted);
    }

    .login-card h2 {
      font-size: 1.8rem;
      margin-bottom: 10px;
      color: var(--text);
    }

    .login-card > p {
      color: var(--text-muted);
      margin-bottom: 30px;
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      color: var(--text);
      font-weight: 500;
    }

    .input-with-icon {
      position: relative;
    }

    .input-with-icon i {
      position: absolute;
      left: 15px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
    }

    .input-with-icon input {
      width: 100%;
      padding: 14px 15px 14px 45px;
      background: var(--card);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-sm);
      color: var(--text);
      font-family: 'Poppins', sans-serif;
      font-size: 15px;
      transition: var(--transition);
    }

    .input-with-icon input:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    }

    .btn-login {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: white;
      border: none;
      border-radius: var(--radius-sm);
      font-family: 'Poppins', sans-serif;
      font-size: 16px;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
      margin-top: 10px;
    }

    .btn-login:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
    }

    .error-message {
      background: rgba(239, 68, 68, 0.1);
      border: 1px solid rgba(239, 68, 68, 0.2);
      color: #f87171;
      padding: 12px;
      border-radius: var(--radius-sm);
      margin-bottom: 20px;
      font-size: 14px;
      display: none;
    }

    .error-message.show {
      display: block;
    }

    .back-link {
      display: inline-block;
      margin-top: 25px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      transition: var(--transition);
    }

    .back-link:hover {
      color: var(--primary);
    }

    /* Animations */
    @keyframes float {
      0%, 100% {
        transform: translateY(0) rotate(0deg);
      }
      50% {
        transform: translateY(-20px) rotate(10deg);
      }
    }

    @media (max-width: 480px) {
      .login-container {
        padding: 15px;
      }
      
      .login-card {
        padding: 30px 20px;
      }
    }