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

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --background: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --error-color: #ef4444;
    --success-color: #10b981;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.description {
    font-size: 1rem;
    color: var(--text-secondary);
}

.input-section {
    background: var(--card-background);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: #ffffff;
    color: var(--text-primary);
    transition: all 0.15s ease;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-input::placeholder {
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 640px) {
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

.generate-btn {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: #ffffff;
    background: var(--primary-color);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.15s ease;
    margin-top: 1rem;
}

.generate-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.generate-btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.loading-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    background: var(--card-background);
    border-radius: 1rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.loader {
    width: 3rem;
    height: 3rem;
    border: 3px solid rgba(79, 70, 229, 0.1);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1.5rem;
}

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

.loading-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-section {
    background: var(--card-background);
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.result-header {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: flex-start;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    gap: 1rem;
}

@media (min-width: 640px) {
    .result-header {
        flex-direction: row;
        align-items: center;
    }
}

.result-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.copy-btn {
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    background: transparent;
    border: 1px solid var(--primary-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.copy-btn:hover {
    background: rgba(79, 70, 229, 0.1);
}

.result-content {
    padding: 2rem;
    max-height: 80vh;
    overflow-y: auto;
    line-height: 1.8;
    white-space: normal;
}

.result-content h1,
.result-content h2,
.result-content h3,
.result-content h4,
.result-content h5,
.result-content h6 {
    color: var(--primary-color);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

.result-content h2 {
    font-size: 1.5rem;
}

.result-content h3 {
    font-size: 1.25rem;
}

.result-content p {
    margin-bottom: 1rem;
}

.result-content ul,
.result-content ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.result-content li {
    margin-bottom: 0.5rem;
}

.result-content pre {
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    overflow-x: auto;
    margin-bottom: 1rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
}

.result-content code {
    background: #f1f5f9;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
}

.result-content pre code {
    background: transparent;
    padding: 0;
}

.error-section {
    padding: 1.5rem 2rem;
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 0.5rem;
}

.error-text {
    color: var(--error-color);
    font-weight: 500;
    text-align: center;
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    min-height: 1.25rem;
}

@media (max-width: 640px) {
    .container {
        padding: 1.5rem 1rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .input-section,
    .result-content {
        padding: 1.5rem;
    }
}