/* Optimized CSS for RSS Feed Reader */

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    /* Colors */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-secondary: #10b981;
    --color-secondary-hover: #059669;
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-warning: #f59e0b;
    --color-warning-hover: #d97706;
    --color-success: #10b981;
    --color-success-hover: #059669;

    /* Background Colors */
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --bg-card: #1f2937;
    --bg-modal: #1f2937;

    /* Text Colors */
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --text-inverse: #111827;

    /* Border Colors */
    --border-primary: #374151;
    --border-secondary: #4b5563;
    --border-focus: #3b82f6;

    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Z-index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Dark theme support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --bg-card: #1e293b;
        --bg-modal: #1e293b;
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        --border-primary: #334155;
        --border-secondary: #475569;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #0066cc;
        --color-secondary: #006600;
        --color-danger: #cc0000;
        --border-primary: #000000;
        --text-primary: #000000;
        --bg-primary: #ffffff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    :root {
        --transition-fast: 0ms;
        --transition-normal: 0ms;
        --transition-slow: 0ms;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== BASE STYLES ===== */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* ===== ARTICLE CARDS ===== */
.article-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 400px;
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.article-card.read {
    opacity: 0.7;
    filter: grayscale(20%);
}

.article-card.read::after {
    content: '✓';
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 24px;
    height: 24px;
    background-color: var(--color-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: bold;
    z-index: 10;
}

/* Article Image Container */
.article-card .relative {
    position: relative;
    flex-shrink: 0;
}

.article-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: var(--bg-tertiary);
    transition: transform var(--transition-normal);
    display: block;
}

.article-card:hover .article-image {
    transform: scale(1.05);
}

/* Lazy loading for images */
.article-image.lazy {
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.article-image.lazy.loaded {
    opacity: 1;
}

/* Source Badge */
.source-badge {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 500;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    line-height: 1.2;
    display: inline-flex;
    align-items: center;
    height: 20px;
    border: 1px solid var(--border-primary);
}

/* For longer source names, use smaller font and tighter spacing */
.source-badge.long-source {
    font-size: 0.6rem;
    max-width: 70px;
    padding: 1px 4px;
    line-height: 1.1;
}

/* Hover effect to show full name */
.source-badge:hover {
    max-width: 150px;
    background: var(--bg-secondary);
    transition: all 0.2s ease;
}

/* Article Content */
.article-card .p-4 {
    padding: var(--space-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Article Title */
.article-card h3 {
    margin: 0 0 var(--space-md) 0;
    font-size: var(--font-size-lg);
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
}

.article-card h3 a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.article-card h3 a:hover {
    color: var(--color-primary);
}

/* Article Description */
.article-card p {
    margin: 0 0 var(--space-md) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    flex: 1;
}

/* Article Meta */
.article-card .flex.items-center.justify-between {
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-primary);
}

.article-card time {
    color: var(--text-muted);
    font-size: var(--font-size-xs);
}

/* Category Badge */
.category-badge {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    height: 20px;
    border: 1px solid var(--border-primary);
}

/* Read Button */
.article-card button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.article-card button:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Compact Read Button */
.read-button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    font-size: 0.7rem;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 20px;
    width: 20px;
    min-width: 20px;
}

.read-button:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Focus states for accessibility */
.article-card:focus-within {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.article-card a:focus,
.article-card button:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ===== TEXT UTILITIES ===== */
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

/* ===== SEARCH HIGHLIGHTING ===== */
.highlight {
    background-color: var(--color-warning);
    color: var(--text-inverse);
    padding: 2px 4px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* ===== FILTER BUTTONS ===== */
.filter-btn {
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--border-primary);
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    text-decoration: none;
    display: inline-block;
}

.filter-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-secondary);
    transform: translateY(-1px);
    color: var(--text-primary);
}

.filter-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.filter-btn.active {
    background-color: var(--color-primary) !important;
    color: var(--text-primary) !important;
    border-color: var(--color-primary) !important;
    box-shadow: var(--shadow-sm);
}

/* ===== MODAL STYLES ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--space-md);
}

.modal.hidden {
    display: none;
}

.modal>div {
    background-color: var(--bg-modal);
    border-radius: var(--radius-lg);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-primary);
}

/* ===== FEED MANAGEMENT ===== */
.feed-item {
    transition: all var(--transition-fast);
    border-bottom: 1px solid var(--border-primary);
    padding: var(--space-md);
}

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

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

/* ===== FORM STYLES ===== */
input,
select,
textarea {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

/* ===== BUTTON STYLES ===== */
button {
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
}

button:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Button variants */
.bg-blue-600 {
    background-color: var(--color-primary);
    color: white;
}

.bg-blue-600:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
}

.bg-green-600 {
    background-color: var(--color-secondary);
    color: white;
}

.bg-green-600:hover:not(:disabled) {
    background-color: var(--color-secondary-hover);
}

.bg-red-600 {
    background-color: var(--color-danger);
    color: white;
}

.bg-red-600:hover:not(:disabled) {
    background-color: var(--color-danger-hover);
}

.bg-gray-600 {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.bg-gray-600:hover:not(:disabled) {
    background-color: var(--border-secondary);
}

/* ===== LOADING ANIMATIONS ===== */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

.animate-spin {
    animation: spin 1s linear infinite;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .article-card {
        min-height: 350px;
    }

    .article-image {
        height: 160px;
    }

    .article-card .p-4 {
        padding: var(--space-md);
    }

    .article-card h3 {
        font-size: var(--font-size-base);
    }

    .filter-btn {
        font-size: var(--font-size-xs);
        padding: var(--space-xs) var(--space-sm);
    }

    .modal>div {
        margin: var(--space-sm);
        max-width: calc(100vw - 2rem);
        max-height: calc(100vh - 2rem);
    }
}

@media (max-width: 480px) {
    .article-card {
        min-height: 300px;
    }

    .article-image {
        height: 120px;
    }

    .article-card h3 {
        font-size: var(--font-size-sm);
    }

    .article-card p {
        font-size: var(--font-size-xs);
    }
}

/* ===== TAILWIND CSS UTILITIES ===== */
/* These replace the Tailwind CDN for production use */

/* Display */
.hidden {
    display: none !important;
}

.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

.inline-flex {
    display: inline-flex;
}

.flex {
    display: flex;
}

.grid {
    display: grid;
}

/* Flexbox */
.flex-col {
    flex-direction: column;
}

.flex-row {
    flex-direction: row;
}

.flex-wrap {
    flex-wrap: wrap;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

/* Spacing */
.space-x-2>*+* {
    margin-left: var(--space-sm);
}

.space-x-4>*+* {
    margin-left: var(--space-lg);
}

.gap-2 {
    gap: var(--space-sm);
}

.gap-4 {
    gap: var(--space-lg);
}

.gap-6 {
    gap: var(--space-2xl);
}

/* Margins */
.mb-2 {
    margin-bottom: var(--space-sm);
}

.mb-3 {
    margin-bottom: var(--space-md);
}

.mb-4 {
    margin-bottom: var(--space-lg);
}

.mb-8 {
    margin-bottom: var(--space-3xl);
}

.mt-3 {
    margin-top: var(--space-md);
}

.mt-8 {
    margin-top: var(--space-3xl);
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

/* Padding */
.p-4 {
    padding: var(--space-lg);
}

.p-6 {
    padding: var(--space-2xl);
}

.px-2 {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
}

.px-3 {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
}

.px-4 {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

.px-6 {
    padding-left: var(--space-2xl);
    padding-right: var(--space-2xl);
}

.py-1 {
    padding-top: var(--space-xs);
    padding-bottom: var(--space-xs);
}

.py-2 {
    padding-top: var(--space-sm);
    padding-bottom: var(--space-sm);
}

.py-3 {
    padding-top: var(--space-md);
    padding-bottom: var(--space-md);
}

/* Width & Height */
.w-full {
    width: 100%;
}

.h-4 {
    height: 1rem;
}

.h-6 {
    height: 1.5rem;
}

.h-48 {
    height: 12rem;
}

.w-4 {
    width: 1rem;
}

.w-6 {
    width: 1.5rem;
}

/* Text */
.text-center {
    text-align: center;
}

.text-sm {
    font-size: var(--font-size-sm);
}

.text-xs {
    font-size: var(--font-size-xs);
}

.text-lg {
    font-size: var(--font-size-lg);
}

.text-xl {
    font-size: var(--font-size-xl);
}

.text-2xl {
    font-size: var(--font-size-2xl);
}

.font-semibold {
    font-weight: 600;
}

.font-bold {
    font-weight: 700;
}

/* Colors */
.text-white {
    color: var(--text-primary);
}

.text-gray-300 {
    color: var(--text-secondary);
}

.text-gray-400 {
    color: var(--text-muted);
}

.text-blue-400 {
    color: var(--color-primary);
}

.text-blue-300 {
    color: var(--color-primary-hover);
}

.bg-gray-900 {
    background-color: var(--bg-primary);
}

.bg-gray-800 {
    background-color: var(--bg-secondary);
}

.bg-gray-700 {
    background-color: var(--bg-tertiary);
}

.bg-blue-600 {
    background-color: var(--color-primary);
}

.bg-green-600 {
    background-color: var(--color-secondary);
}

.bg-red-600 {
    background-color: var(--color-danger);
}

.bg-gray-600 {
    background-color: var(--bg-tertiary);
}

/* Borders */
.border-b {
    border-bottom-width: 1px;
}

.border-b-2 {
    border-bottom-width: 2px;
}

.border-gray-700 {
    border-color: var(--border-primary);
}

.border-blue-200 {
    border-color: #bfdbfe;
}

/* Border Radius */
.rounded {
    border-radius: var(--radius-md);
}

.rounded-lg {
    border-radius: var(--radius-lg);
}

.rounded-t-lg {
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
}

.rounded-full {
    border-radius: 50%;
}

/* Object Fit */
.object-cover {
    object-fit: cover;
}

/* Overflow */
.overflow-hidden {
    overflow: hidden;
}

.overflow-y-auto {
    overflow-y: auto;
}

/* Max Width/Height */
.max-w-4xl {
    max-width: 56rem;
}

.max-w-7xl {
    max-width: 80rem;
}

.max-h-\[90vh\] {
    max-height: 90vh;
}

.max-h-\[calc\(90vh-140px\)\] {
    max-height: calc(90vh - 140px);
}

/* Grid */
.grid-cols-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
}

/* Responsive */
@media (min-width: 768px) {
    .md\:grid-cols-2 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .md\:flex-row {
        flex-direction: row;
    }

    .md\:items-center {
        align-items: center;
    }

    .md\:justify-between {
        justify-content: space-between;
    }

    .md\:mb-0 {
        margin-bottom: 0;
    }
}

@media (min-width: 1024px) {
    .lg\:grid-cols-3 {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}



/* ===== RSS UPDATE STATUS INDICATOR ===== */
#rssUpdateStatus {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

#rssUpdateStatus.hidden {
    display: none;
}

.opacity-50 {
    opacity: 0.5;
}

.cursor-not-allowed {
    cursor: not-allowed;
}

/* ===== NOTIFICATIONS ===== */
.notification {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: var(--z-toast);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    max-width: 400px;
    word-wrap: break-word;
}

.notification.show {
    transform: translateX(0);
}

.notification-success {
    background-color: var(--color-success);
    color: white;
}

.notification-error {
    background-color: var(--color-danger);
    color: white;
}

.notification-info {
    background-color: var(--color-primary);
    color: white;
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border-secondary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .article-card {
        border: 2px solid var(--border-primary);
    }

    .highlight {
        background-color: #ffff00;
        color: #000000;
    }

    .filter-btn.active {
        background-color: #000000 !important;
        color: #ffffff !important;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .article-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }

    .article-image {
        max-height: 200px;
    }

    .filter-btn,
    .modal,
    .notification {
        display: none !important;
    }
}