:root {
    --primary-color: #0077B7;
    --primary-dark: #005885;
    --secondary-color: #00A0DC;
    --accent-color: #F3F6F8;
    --text-primary: #212529;
    --text-secondary: #6C757D;
    --border-color: #DEE2E6;
    --success-color: #28A745;
    --error-color: #DC3545;
    --warning-color: #FFC107;
    --background-color: #F8F9FA;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 10px;
    padding: 20px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    color: white;
    box-shadow: var(--card-shadow);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.header h1 i {
    font-size: 2.2rem;
}

.header p {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    align-items: stretch;
}

.form-section,
.output-section {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 25px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

label {
    display: block;
    /* margin-bottom: 8px; */
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.required {
    color: var(--error-color);
}

select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background-color: white;
    color: var(--text-primary);
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 119, 183, 0.1);
}

textarea {
    width: 100%;
    min-height: 100px;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    line-height: 1.5;
    resize: vertical;
    font-family: inherit;
    transition: var(--transition);
    background: white;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 119, 183, 0.1);
}

.form-hint {
    display: block;
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}

.switch-tabs {
    margin-top: 10px;
}

.switch-wrapper {
    position: relative;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    background-color: var(--accent-color);
    padding: 4px;
    border-radius: var(--border-radius);
    width: 100%;
    border: 2px solid var(--border-color);
}

.switch-wrapper input[type="radio"] {
    display: none;
}

.switch-tab {
    padding: 12px;
    text-align: center;
    font-size: 0.95rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    z-index: 1;
    user-select: none;
}

.glider {
    position: absolute;
    display: flex;
    height: calc(100% - 8px);
    width: calc(50% - 4px);
    background-color: white;
    border-radius: calc(var(--border-radius) - 2px);
    transition: 0.25s ease-out;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    top: 4px;
    left: 4px;
}

input[type="radio"]#customOption:checked ~ .glider {
    transform: translateX(100%);
}

input[type="radio"]:checked + .switch-tab {
    color: var(--primary-color);
    font-weight: 500;
}

.toggle-options {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 10px;
}

.toggle-option {
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: white;
    transition: var(--transition);
}

.toggle-option:hover {
    border-color: var(--primary-color);
    background-color: var(--accent-color);
}

.toggle-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-weight: 400;
    margin: 0;
}

.toggle-text {
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 24px;
    margin-left: 16px;
}

.toggle-switch input[type="checkbox"] {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    border-radius: 24px;
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--primary-color);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.toggle-switch input:checked ~ .toggle-text {
    color: var(--primary-color);
    font-weight: 500;
}

.toggle-option:has(input:checked) {
    border-color: var(--primary-color);
    background-color: rgba(0, 119, 183, 0.05);
}

.toggle-option:has(input:checked) .toggle-text {
    color: var(--primary-color);
    font-weight: 500;
}

.generate-btn {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: var(--card-shadow);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 119, 183, 0.3);
}

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

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.output-section {
    position: sticky;
    top: 20px;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.output-header h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
}

.output-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    padding: 10px 12px;
    background: var(--accent-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.action-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.output-content {
    position: relative;
}

#outputText {
    width: 100%;
    min-height: 522px;
    padding: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    font-family: inherit;
    transition: var(--transition);
}

#outputText:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 119, 183, 0.1);
}

.character-count {
    text-align: right;
    margin-top: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--card-shadow);
}

.loading-spinner i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.loading-spinner p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0;
}

.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--success-color);
    color: white;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1001;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast i {
    font-size: 1.2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .switch-wrapper {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(2, 1fr);
        padding: 4px;
    }

    .glider {
        width: calc(100% - 8px);
        height: calc(50% - 4px);
    }

    input[type="radio"]#customOption:checked ~ .glider {
        transform: translateY(100%);
    }
    
    .toggle-options {
        gap: 12px;
    }
    
    .header h1 {
        font-size: 2rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .container {
        padding: 15px;
    }
    
    .form-section,
    .output-section {
        padding: 20px;
    }
    
    .output-section {
        position: static;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .header p {
        font-size: 1rem;
    }
    
    .switch-tab {
        padding: 10px;
        font-size: 0.9rem;
    }
    
    .toggle-options {
        gap: 10px;
    }
    
    .toggle-option {
        padding: 12px;
    }
    
    .toggle-text {
        font-size: 0.85rem;
    }
    
    .toggle-switch {
        width: 44px;
        height: 22px;
    }
    
    .toggle-slider:before {
        height: 16px;
        width: 16px;
        left: 3px;
        bottom: 3px;
    }
    
    .toggle-switch input:checked + .toggle-slider:before {
        transform: translateX(22px);
    }
}