* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background: linear-gradient(145deg, #0a0a0a 0%, #000000 100%);
    color: #f0f0f0;
    font-family: 'Inter', system-ui, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}
.container {
    max-width: 450px;
    width: 100%;
    background: rgba(12, 12, 16, 0.65);
    backdrop-filter: blur(12px);
    border-radius: 2rem;
    padding: 2rem;
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.6);
}
h1 {
    font-size: 1.8rem;
    text-align: center;
    background: linear-gradient(135deg, #FFFFFF, #ff3b5c);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
}
.subtitle {
    text-align: center;
    color: #bcbcde;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}
.form-group { margin-bottom: 1rem; }
label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: #ccc;
}
input {
    width: 100%;
    padding: 0.8rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.8rem;
    color: white;
    font-size: 0.9rem;
}
input:focus {
    outline: none;
    border-color: #ff3b5c;
}
.btn-primary {
    width: 100%;
    padding: 0.8rem;
    background: #ff3b5c;
    border: none;
    border-radius: 2rem;
    color: white;
    font-weight: bold;
    cursor: pointer;
    margin-top: 1rem;
}
.btn-primary:hover { background: #ff1f45; transform: translateY(-2px); }
.error {
    background: rgba(255, 68, 68, 0.2);
    border: 1px solid #ff4444;
    border-radius: 0.5rem;
    padding: 0.8rem;
    margin-bottom: 1rem;
    color: #ff8888;
    font-size: 0.8rem;
}
.register-link {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.8rem;
    color: #888;
}
.register-link a { color: #ff3b5c; text-decoration: none; }
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 1.2rem;
}
.success-message {
    background: rgba(76, 175, 80, 0.2);
    border: 1px solid #4caf50;
    border-radius: 0.5rem;
    padding: 0.8rem;
    margin-bottom: 1rem;
    color: #86efac;
    text-align: center;
}