:root {
    /* Base Colors */
    --primary: #6c5ce7;
    --secondary: #a29bfe;
    --accent: #00cec9;
    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    
    /* Gradient Colors */
    --gradient-1: #6c5ce7;
    --gradient-2: #8e44ad;
    --gradient-3: #0984e3;
    --gradient-4: #00cec9;
    --gradient-5: #00b894;
    
    /* Dark Mode Colors */
    --bg-primary: #10131e;
    --bg-secondary: #191e2e;
    --bg-card: #1e2235;
    --text-primary: #f5f6fa;
    --text-secondary: #dcdde1;
    --text-muted: #a4b0be;
    --border-color: #2f3542;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-circle: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.2);
    --shadow-inner: inset 0 2px 10px rgba(0, 0, 0, 0.1);

    /* Animations */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #141b33 100%);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.app-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xs);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-xl);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-circle);
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
    color: white;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    animation: pulse 2s infinite alternate;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--gradient-1), var(--gradient-3), var(--gradient-4));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(108, 92, 231, 0.2);
}

.theme-toggle {
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--text-primary);
    transform: rotate(15deg);
}

/* Main Content Styles */
main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.app-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 992px) {
    .app-content {
        grid-template-columns: minmax(300px, 400px) 1fr;
    }
}

/* Card Styles */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    border: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, 
        var(--gradient-1), 
        var(--gradient-2), 
        var(--gradient-3), 
        var(--gradient-4), 
        var(--gradient-5));
    background-size: 500% 100%;
    animation: gradientMove 15s ease infinite;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Form Styles */
.input-section h2, .output-section h2 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 600;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

input[type="text"],
select {
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.3);
}

input[type="range"] {
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--gradient-1), var(--gradient-4));
    border-radius: var(--radius-md);
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
    border: 3px solid var(--gradient-1);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slider-value {
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-circle);
    font-size: 0.85rem;
    font-weight: 600;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.generate-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2), var(--gradient-3));
    background-size: 200% 200%;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    margin-top: var(--spacing-lg);
}

.generate-btn:hover {
    background-position: right center;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(108, 92, 231, 0.3);
}

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

.generate-btn.loading .btn-text {
    opacity: 0;
}

.generate-btn.loading .loading-spinner {
    opacity: 1;
}

.loading-spinner {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
    opacity: 0;
}

/* Output Section Styles */
.output-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.output-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.output-section.hidden {
    display: none;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.icon-btn {
    background: var(--bg-secondary);
    border: none;
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-circle);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    color: var(--text-primary);
    background: var(--bg-primary);
    transform: translateY(-2px);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-md);
}

/* WYSIWYG Editor Styles */
.editor-wrapper {
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-inner);
}

.editor-wrapper:focus-within {
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.3);
    border-color: var(--primary);
}

.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: linear-gradient(to right, var(--bg-primary), var(--bg-secondary));
    border-bottom: 1px solid var(--border-color);
}

.toolbar-group {
    display: flex;
    gap: 2px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background-color: var(--bg-card);
    box-shadow: var(--shadow-sm);
}

.editor-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    outline: none;
}

.editor-btn span {
    font-size: 0.7rem;
    position: absolute;
    bottom: 4px;
    right: 6px;
}

.editor-btn:hover {
    color: var(--text-primary);
    background-color: rgba(108, 92, 231, 0.1);
}

.editor-btn.active {
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
}

.wysiwyg-editor {
    min-height: 300px;
    max-height: 600px;
    overflow-y: auto;
    padding: var(--spacing-lg);
    line-height: 1.7;
    outline: none;
    color: var(--text-primary);
    background-color: var(--bg-card);
}

.wysiwyg-editor:focus {
    outline: none;
}

.wysiwyg-editor h1, 
.wysiwyg-editor h2, 
.wysiwyg-editor h3 {
    margin: 1.5rem 0 1rem;
    color: var(--text-primary);
    position: relative;
    padding-left: 0.5rem;
}

.wysiwyg-editor h1::before,
.wysiwyg-editor h2::before,
.wysiwyg-editor h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--gradient-1), var(--gradient-3));
    border-radius: var(--radius-sm);
}

.wysiwyg-editor h1 {
    font-size: 1.8rem;
}

.wysiwyg-editor h2 {
    font-size: 1.5rem;
}

.wysiwyg-editor h3 {
    font-size: 1.3rem;
}

.wysiwyg-editor p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.wysiwyg-editor ul, 
.wysiwyg-editor ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.wysiwyg-editor li {
    margin-bottom: 0.5rem;
}

.wysiwyg-editor strong {
    color: var(--text-primary);
    font-weight: 600;
}

.wysiwyg-editor a {
    color: var(--accent);
    text-decoration: none;
    position: relative;
    padding: 0 2px;
    transition: all var(--transition-fast);
}

.wysiwyg-editor a:hover {
    color: var(--gradient-4);
}

.wysiwyg-editor a::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 1px;
    background: linear-gradient(to right, var(--gradient-3), var(--gradient-4));
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s ease;
}

.wysiwyg-editor a:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

.wysiwyg-editor img {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: 1rem 0;
    transition: all var(--transition-normal);
    border: 3px solid var(--bg-secondary);
}

.wysiwyg-editor img:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

/* Footer Styles */
footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer p {
    margin-bottom: var(--spacing-sm);
}

/* Animations */
@keyframes gradientMove {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(108, 92, 231, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(108, 92, 231, 0);
    }
}

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

@keyframes modalSlideIn {
    0% {
        transform: translateY(-50px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    width: 90%;
    max-width: 500px;
    padding: var(--spacing-xl);
    animation: modalSlideIn 0.4s ease forwards;
}

.api-key-input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.api-key-input-container input {
    padding-right: 45px;
}

.api-key-input-container .icon-btn {
    position: absolute;
    right: 5px;
    background: transparent;
    color: var(--text-muted);
}

.api-key-help {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

.api-key-help a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.api-key-help a:hover {
    color: var(--gradient-4);
    text-decoration: underline;
}

.remember-key-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.remember-key-option input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    background-color: var(--bg-secondary);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

.remember-key-option input[type="checkbox"]:checked {
    background-color: var(--primary);
    border-color: var(--primary);
}

.remember-key-option input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 0.7rem;
    top: 1px;
    left: 4px;
}

.remember-key-option label {
    font-size: 0.9rem;
    cursor: pointer;
}

/* API Key Management */
.api-settings {
    position: relative;
    display: flex;
    align-items: center;
    margin-left: var(--spacing-lg);
    cursor: pointer;
}

.api-status {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-circle);
    margin-right: var(--spacing-sm);
}

.api-status.connected {
    background-color: var(--success);
    box-shadow: 0 0 5px var(--success);
}

.api-status.disconnected {
    background-color: var(--danger);
    box-shadow: 0 0 5px var(--danger);
}

.api-settings-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    width: 210px;
    padding: var(--spacing-md);
    display: none;
    z-index: 100;
}

.api-settings-dropdown.visible {
    display: block;
    animation: fadeIn 0.2s ease forwards;
}

.api-settings-dropdown ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.api-settings-dropdown li {
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.api-settings-dropdown li:hover {
    background-color: var(--bg-secondary);
}

.api-settings-dropdown li i {
    margin-right: var(--spacing-sm);
    width: 16px;
    text-align: center;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .app-content {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    header h1 {
        font-size: 1.3rem;
    }
}

/* Animation classes */
.fade-in {
    animation: fadeIn var(--transition-normal) forwards;
}

.slide-up {
    animation: slideUp var(--transition-normal) forwards;
}

.shake {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

/* Keywords Styles */
.keywords-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.keywords-input-wrapper {
    display: flex;
    position: relative;
}

.keywords-input-wrapper input {
    width: 100%;
    padding-right: 45px;
}

.keyword-add-btn {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 45px;
    border: none;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-3));
    color: white;
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.keyword-add-btn:hover {
    background: linear-gradient(135deg, var(--gradient-2), var(--gradient-4));
    transform: translateY(-2px);
}

.keywords-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    min-height: 40px;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-color);
    background-color: var(--bg-secondary);
}

.keyword-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 5px 10px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-3));
    color: white;
    animation: tagAppear 0.3s ease forwards;
}

.keyword-tag-remove {
    cursor: pointer;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.2);
    transition: all var(--transition-fast);
}

.keyword-tag-remove:hover {
    background-color: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
}

.tooltip {
    position: relative;
    display: inline-flex;
    margin-left: var(--spacing-xs);
    color: var(--text-muted);
    cursor: help;
}

.tooltip:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--gradient-1), var(--gradient-2));
    color: white;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    white-space: nowrap;
    z-index: 100;
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.2s ease forwards;
}

.tooltip:hover::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid var(--gradient-2);
    z-index: 100;
    animation: fadeIn 0.2s ease forwards;
}

@keyframes tagAppear {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }
    50% {
        opacity: 1;
        transform: translateY(-5px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes slideUp {
    0% {
        transform: translateY(20px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes shake {
    10%, 90% {
        transform: translate3d(-1px, 0, 0);
    }
    20%, 80% {
        transform: translate3d(2px, 0, 0);
    }
    30%, 50%, 70% {
        transform: translate3d(-4px, 0, 0);
    }
    40%, 60% {
        transform: translate3d(4px, 0, 0);
    }
}