/**
 * RSS Feed Generator Styles
 * Based on Linear Theme
 */

/* CSS Variables for Light Mode */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-tertiary: #9ca3af;
    --border-primary: #e5e7eb;
    --border-secondary: #d1d5db;
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-rgb: 99, 102, 241;
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
}

/* CSS Variables for Dark Mode */
[data-theme='dark'] {
    --bg-primary: #0f0f17;
    --bg-secondary: #1a1a24;
    --bg-tertiary: #25252f;
    --text-primary: #f9fafb;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --border-primary: #3f3f46;
    --border-secondary: #52525b;
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --primary-rgb: 129, 140, 248;
}

/* Hero Section */
.rss-hero {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    padding: var(--spacing-8) var(--spacing-4);
    text-align: center;
    border-bottom: 1px solid var(--border-primary);
}

.rss-hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.rss-hero-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    margin-bottom: var(--spacing-4);
    box-shadow: 0 4px 20px rgba(var(--primary-rgb), 0.3);
}

.rss-hero-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.rss-hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Main Container */
.rss-generator-main {
    min-height: calc(100vh - 60px);
}

.rss-generator-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-6) var(--spacing-4);
}

/* Platform Tabs */
.platform-tabs {
    display: flex;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-5);
    flex-wrap: wrap;
    justify-content: center;
}

.platform-tab {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    font-weight: 500;
}

.platform-tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-secondary);
}

.platform-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.platform-tab svg {
    flex-shrink: 0;
}

/* Input Section */
.feed-input-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    border: 1px solid var(--border-primary);
    margin-bottom: var(--spacing-6);
}

.platform-form {
    display: none;
}

.platform-form.active {
    display: block;
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-4);
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

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

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

.form-hint {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-top: var(--spacing-1);
}

/* Radio & Checkbox Groups */
.radio-group,
.checkbox-group {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.radio-item,
.checkbox-item {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.radio-item input,
.checkbox-item input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* Advanced Settings */
.advanced-settings-toggle {
    border-top: 1px solid var(--border-primary);
    padding-top: var(--spacing-4);
    margin-top: var(--spacing-4);
}

.toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn .chevron {
    transition: transform 0.2s ease;
}

.toggle-btn.active .chevron {
    transform: rotate(180deg);
}

.advanced-settings-panel {
    padding-top: var(--spacing-4);
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

/* Generate Button */
.generate-section {
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-primary);
    margin-top: var(--spacing-4);
}

.generate-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    width: 100%;
    padding: var(--spacing-4);
    font-size: 1.1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark, #4338ca) 100%);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
}

.generate-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.4);
}

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

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

/* Result Section */
.result-card {
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    text-align: center;
}

.result-card.success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.result-card.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.result-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin-bottom: var(--spacing-4);
}

.result-card.success .result-icon {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.result-card.error .result-icon {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.result-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
}

.error-title {
    color: #ef4444;
}

.error-message {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-4);
}

/* URL Copy Box */
.result-url-box {
    margin-bottom: var(--spacing-4);
    text-align: left;
}

.result-url-box label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2);
}

.url-copy-group {
    display: flex;
    gap: var(--spacing-2);
}

.url-copy-group .form-input {
    flex: 1;
    font-family: monospace;
    font-size: 0.9rem;
}

.copy-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s ease;
    white-space: nowrap;
}

.copy-btn:hover {
    background: var(--primary-dark, #4338ca);
}

.copy-btn.copied {
    background: #22c55e;
}

/* Action Buttons */
.result-actions {
    display: flex;
    gap: var(--spacing-3);
    justify-content: center;
    flex-wrap: wrap;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-5);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.action-btn.primary {
    background: var(--primary);
    color: white;
    border: none;
}

.action-btn.primary:hover {
    background: var(--primary-dark, #4338ca);
}

.action-btn.secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
}

.action-btn.secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

/* My Feeds Section */
.my-feeds-section {
    margin-top: var(--spacing-8);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-4);
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.refresh-feeds-btn {
    padding: var(--spacing-2);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.refresh-feeds-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Feeds List */
.feeds-list {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
    overflow: hidden;
}

.feeds-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    padding: var(--spacing-8);
    color: var(--text-secondary);
}

.feed-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--border-primary);
    transition: background 0.2s ease;
}

.feed-item:last-child {
    border-bottom: none;
}

.feed-item:hover {
    background: var(--bg-tertiary);
}

.feed-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    flex: 1;
    min-width: 0;
}

.feed-platform-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.feed-platform-icon.youtube {
    background: rgba(255, 0, 0, 0.1);
    color: #ff0000;
}

.feed-platform-icon.reddit {
    background: rgba(255, 69, 0, 0.1);
    color: #ff4500;
}

.feed-platform-icon.google_news {
    background: rgba(66, 133, 244, 0.1);
    color: #4285f4;
}

.feed-platform-icon.website {
    background: rgba(107, 114, 128, 0.1);
    color: #6b7280;
}

.feed-details {
    flex: 1;
    min-width: 0;
}

.feed-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.feed-meta {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.feed-actions {
    display: flex;
    gap: var(--spacing-2);
}

.feed-action-btn {
    padding: var(--spacing-2);
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.feed-action-btn:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.feed-action-btn.delete:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

/* Empty State */
.feeds-empty {
    text-align: center;
    padding: var(--spacing-8);
    color: var(--text-secondary);
}

.empty-icon {
    opacity: 0.5;
    margin-bottom: var(--spacing-4);
}

.feeds-empty p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-2);
}

.empty-hint {
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

/* How It Works Section */
.how-it-works-section {
    margin-top: var(--spacing-10);
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--border-primary);
}

.how-it-works-section h2 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-6);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-4);
}

.step-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    text-align: center;
    border: 1px solid var(--border-primary);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-3);
}

.step-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.step-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    background: var(--bg-primary);
    padding: var(--spacing-8);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.loading-content p {
    margin-top: var(--spacing-4);
    color: var(--text-secondary);
}

/* Loading Spinner */
.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-primary);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner.large {
    width: 48px;
    height: 48px;
    border-width: 4px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   Dark Mode Styles
   ======================================== */

[data-theme='dark'] .rss-hero {
    background: linear-gradient(135deg, #1e1e2e 0%, #0f0f17 100%);
    border-bottom-color: var(--border-secondary);
}

[data-theme='dark'] .rss-hero-icon {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

[data-theme='dark'] .platform-tab {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
    color: var(--text-secondary);
}

[data-theme='dark'] .platform-tab:hover {
    background: var(--bg-secondary);
    border-color: var(--border-primary);
}

[data-theme='dark'] .platform-tab.active {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    border-color: #6366f1;
}

[data-theme='dark'] .feed-input-section {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .form-input,
[data-theme='dark'] .form-select {
    background: var(--bg-secondary);
    border-color: var(--border-secondary);
    color: var(--text-primary);
}

[data-theme='dark'] .form-input:focus,
[data-theme='dark'] .form-select:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

[data-theme='dark'] .form-input::placeholder {
    color: var(--text-tertiary);
}

[data-theme='dark'] .toggle-btn {
    color: var(--text-secondary);
}

[data-theme='dark'] .toggle-btn:hover {
    color: var(--text-primary);
}

[data-theme='dark'] .generate-btn {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

[data-theme='dark'] .generate-btn:hover {
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.5);
}

[data-theme='dark'] .result-card.success {
    background: rgba(34, 197, 94, 0.15);
    border-color: rgba(34, 197, 94, 0.4);
}

[data-theme='dark'] .result-card.error {
    background: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
}

[data-theme='dark'] .copy-btn {
    background: #6366f1;
}

[data-theme='dark'] .copy-btn:hover {
    background: #4f46e5;
}

[data-theme='dark'] .action-btn.secondary {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .action-btn.secondary:hover {
    background: var(--bg-secondary);
}

[data-theme='dark'] .action-btn.primary {
    background: #6366f1;
}

[data-theme='dark'] .action-btn.primary:hover {
    background: #4f46e5;
}

[data-theme='dark'] .feeds-list {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .feed-item {
    border-bottom-color: var(--border-secondary);
}

[data-theme='dark'] .feed-item:hover {
    background: var(--bg-secondary);
}

[data-theme='dark'] .feed-action-btn:hover {
    background: var(--bg-secondary);
}

[data-theme='dark'] .refresh-feeds-btn {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .refresh-feeds-btn:hover {
    background: var(--bg-secondary);
}

[data-theme='dark'] .step-card {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .step-number {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

[data-theme='dark'] .loading-content {
    background: var(--bg-secondary);
}

[data-theme='dark'] .loading-spinner {
    border-color: var(--border-secondary);
    border-top-color: #6366f1;
}

/* Feature Explanation Section - Dark Mode */
[data-theme='dark'] .feature-explanation {
    background: var(--bg-primary);
}

[data-theme='dark'] .feature-intro {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(79, 70, 229, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

[data-theme='dark'] .advantage-card,
[data-theme='dark'] .use-case-card,
[data-theme='dark'] .tip-card {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .advantage-card:hover,
[data-theme='dark'] .use-case-card:hover {
    background: var(--bg-secondary);
    border-color: rgba(99, 102, 241, 0.3);
}

[data-theme='dark'] .advantage-icon,
[data-theme='dark'] .use-case-icon {
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
}

[data-theme='dark'] .tip-number {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

[data-theme='dark'] .faq-item {
    background: var(--bg-tertiary);
    border-color: var(--border-secondary);
}

[data-theme='dark'] .faq-question:hover {
    background: var(--bg-secondary);
}

/* ========================================
   Feature Explanation Section Styles
   ======================================== */

.feature-explanation {
    padding: var(--spacing-10) var(--spacing-4);
    background: var(--bg-secondary);
}

.feature-explanation-container {
    max-width: 1000px;
    margin: 0 auto;
}

/* Feature Intro */
.feature-intro {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
    padding: var(--spacing-8);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(79, 70, 229, 0.02) 100%);
    border: 1px solid rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-10);
}

.feature-intro-content {
    flex: 1;
}

.feature-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-3);
}

.feature-description {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.feature-intro-visual {
    flex-shrink: 0;
}

.feature-intro-visual svg {
    color: var(--primary);
}

/* Feature Section */
.feature-section {
    margin-bottom: var(--spacing-10);
}

.section-title {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-5);
    text-align: center;
}

/* Advantages Grid */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-4);
}

.advantage-card {
    padding: var(--spacing-5);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.advantage-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.advantage-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-3);
}

.advantage-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.advantage-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Use Cases Grid */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-4);
}

.use-case-card {
    padding: var(--spacing-5);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.use-case-card:hover {
    border-color: var(--primary);
}

.use-case-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-3);
}

.use-case-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.use-case-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Tips Grid */
.tips-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.tip-card {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
}

.tip-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.tip-content {
    flex: 1;
}

.tip-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
}

.tip-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* FAQ Section */
.faq-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-4);
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: background 0.2s ease;
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question svg {
    flex-shrink: 0;
    transition: transform 0.2s ease;
    color: var(--text-tertiary);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    display: none;
    padding: 0 var(--spacing-4) var(--spacing-4);
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-item.active .faq-answer {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .feature-intro {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-4);
        padding: var(--spacing-5);
    }

    .feature-intro-visual {
        order: -1;
    }

    .feature-intro-visual svg {
        width: 80px;
        height: 80px;
    }

    .feature-title {
        font-size: 1.5rem;
    }

    .feature-description {
        font-size: 1rem;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .rss-hero {
        padding: var(--spacing-6) var(--spacing-4);
    }

    .rss-hero-title {
        font-size: 1.5rem;
    }

    .platform-tabs {
        gap: var(--spacing-1);
    }

    .platform-tab {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 0.85rem;
    }

    .platform-tab span {
        display: none;
    }

    .feed-input-section {
        padding: var(--spacing-4);
    }

    .url-copy-group {
        flex-direction: column;
    }

    .result-actions {
        flex-direction: column;
    }

    .action-btn {
        width: 100%;
        justify-content: center;
    }

    .feed-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-3);
    }

    .feed-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .feature-explanation {
        padding: var(--spacing-6) var(--spacing-3);
    }

    .section-title {
        font-size: 1.2rem;
    }

    .tip-card {
        flex-direction: column;
        text-align: center;
    }

    .tip-number {
        margin: 0 auto var(--spacing-3);
    }
}