body {
    background: linear-gradient( 135deg, #1a1a2e, #16213e, #0f3460);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', sans-serif;
}

.login-card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 420px;
}

.login-header {
    background: linear-gradient( 135deg, #2c3e50, #3498db);
    padding: 2rem;
    text-align: center;
    color: white;
    border-radius: 16px 16px 0 0;
}

.login-body { padding: 2rem; }
.input-icon { position: relative; }
.input-icon i { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: #aaa; }
.input-icon input { padding-left: 35px; }
.btn-login {
    background: linear-gradient( 135deg, #3498db, #2980b9);
    border: none;
    color: white;
    width: 100%;
    padding: 0.6rem;
    border-radius: 8px;
}
.btn-login:hover { opacity: 0.9; color: white; }
.lang-btn {
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.8rem;
    text-decoration: none;
    color: #555;
    margin: 2px;
    display: inline-block;
}
.lang-btn.active { background: #3498db; color: white; border-color: #3498db; }
.error-alert {
    background: #fff5f5;
    border: 1px solid #ffcccc;
    border-radius: 8px;
    padding: 0.75rem;
    color: #c0392b;
    margin-bottom: 1rem;
    font-size: 0.88rem;
}