body {
    background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    min-height: 100vh;
    color: #e0e0e0;
}

h1 {
    color: #ffffff;
    font-weight: 700;
    text-shadow: 0 0 20px rgba(100, 100, 255, 0.3);
}

h1 a {
    color: #ffffff !important;
}

.card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.card-header {
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.form-control, .form-select {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #e0e0e0;
}

.form-control:focus, .form-select:focus {
    background: rgba(255, 255, 255, 0.1);
    border-color: #6c63ff;
    color: #ffffff;
    box-shadow: 0 0 0 0.2rem rgba(108, 99, 255, 0.25);
}

.form-control::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.btn-primary {
    background: linear-gradient(135deg, #6c63ff, #4834d4);
    border: none;
    font-weight: 600;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #7c74ff, #5844e4);
}

.form-check-input:checked {
    background-color: #6c63ff;
    border-color: #6c63ff;
}

.form-check-input {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}

.form-text {
    color: rgba(255, 255, 255, 0.5);
}

.text-muted {
    color: rgba(255, 255, 255, 0.5) !important;
}

pre#decrypted-message {
    color: #e0e0e0;
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 0.375rem;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.95rem;
}

.card.border-success {
    border-color: rgba(40, 167, 69, 0.5) !important;
}

.card.border-danger {
    border-color: rgba(220, 53, 69, 0.5) !important;
}

.input-group .btn-outline-secondary {
    border-color: rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.6);
}

.input-group .btn-outline-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

#share-link {
    background: rgba(255, 255, 255, 0.08);
    color: #6c63ff;
    font-weight: 600;
}

code {
    color: #6c63ff;
}