:root {
    --navy-dark: #0a1628;
    --navy: #0d1b3e;
    --navy-light: #14284f;
    --teal: #14b8a6;
    --teal-light: #5eead4;
    --teal-dark: #0f766e;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background:
        radial-gradient(circle at 85% 15%, rgba(20, 184, 166, 0.18), transparent 45%),
        linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 55%, var(--navy-dark) 100%);
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-container {
    background-color: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(94, 234, 212, 0.25);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(20, 184, 166, 0.15);
    text-align: center;
    width: 300px;
}

.logo {
    width: 220px;
    height: auto;
    margin-bottom: 10px;
}

.tagline {
    color: var(--teal-light);
    font-size: 12px;
    margin: 0 0 20px;
}

h2 {
    margin-bottom: 20px;
    color: #fff;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 5px;
    color: #cdd7e6;
    text-align: left;
}

input[type="text"],
input[type="password"] {
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--navy-light);
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.08);
    color: #fff;
}

input[type="text"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--teal);
}

input[type="submit"] {
    padding: 10px;
    border: none;
    border-radius: 5px;
    background: linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);
    color: white;
    font-size: 16px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background: linear-gradient(135deg, var(--teal-light) 0%, var(--teal) 100%);
}

.login-alert {
    background: rgba(220, 38, 38, 0.16);
    border: 1px solid rgba(248, 113, 113, 0.6);
    color: #fecaca;
    border-radius: 8px;
    padding: 10px 12px;
    margin-bottom: 16px;
    font-size: 13px;
    text-align: left;
    animation: login-shake 0.4s ease;
}

.login-alert[hidden] { display: none; }

@keyframes login-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}