* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
}

.joke-generator {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2em;
}

.joke-display {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.joke-text {
    color: #333;
    font-size: 1.1em;
    line-height: 1.6;
    text-align: center;
    font-weight: 500;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.btn {
    flex: 1;
    min-width: 100px;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: #f0f0f0;
    color: #333;
    border: 2px solid #ddd;
}

.btn-secondary:hover {
    background: #e8e8e8;
    border-color: #667eea;
    color: #667eea;
}

.btn-secondary:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.category-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.category-selector label {
    font-weight: 600;
    color: #333;
    white-space: nowrap;
}

.category-selector select {
    flex: 1;
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.category-selector select:hover {
    border-color: #667eea;
}

.category-selector select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.spinner {
    display: none;
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

.spinner.hidden {
    display: none;
}

.spinner:not(.hidden) {
    display: block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: #fee;
    border: 2px solid #f88;
    color: #c33;
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    display: none;
    font-weight: 500;
}

.error:not(.hidden) {
    display: block;
    animation: shake 0.3s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

@media (max-width: 480px) {
    .joke-generator {
        padding: 20px;
    }

    h1 {
        font-size: 1.5em;
        margin-bottom: 20px;
    }

    .joke-display {
        padding: 15px;
        min-height: 100px;
    }

    .joke-text {
        font-size: 1em;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .category-selector {
        flex-direction: column;
        align-items: flex-start;
    }

    .category-selector select {
        width: 100%;
    }
}