:root {
    --bg: #0b1020;
    --card: #121a33;
    --card2: #0e1530;
    --fg: #e6ebff;
    --muted: #98a2c7;
    --brand: #6ea8fe;
    --danger: #ff6b6b;
    --success: #6bff8b;
    --rad: 16px;
    --pad: 16px;
    --transition: all 0.2s ease;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
    background: var(--bg);
    color: var(--fg);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}
.login-card {
    background: var(--card);
    padding: 30px;
    border-radius: var(--rad);
    width: 100%;
    max-width: 400px;
    transition: var(--transition);
}
.login-card:hover { box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4); }
.login-card h3 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 24px;
    color: var(--brand);
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.2);
    color: var(--fg);
    font-size: 16px;
    transition: var(--transition);
}
.form-control:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 2px rgba(110, 168, 254, 0.2);
}
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 10px;
    border: none;
    background: var(--brand);
    color: white;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}
.btn:hover {
    background: #5d96e8;
    transform: translateY(-2px);
}
.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
}
.alert-danger {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}