/* 
 * RSS Feeder - Minimal CSS
 * Clean, responsive design without frameworks
 */

/* ============== Reset & Variables ============== */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    
    --color-border: #e2e8f0;
    --color-border-dark: #cbd5e1;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 12px;
    
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;
    
    --transition: 150ms ease;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-bg-secondary: #1e293b;
        --color-bg-tertiary: #334155;
        
        --color-text: #f1f5f9;
        --color-text-secondary: #94a3b8;
        --color-text-muted: #64748b;
        
        --color-border: #334155;
        --color-border-dark: #475569;
    }
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ============== Layout ============== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.main {
    flex: 1;
    padding: 2rem 0;
}

.page-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
}

.page-layout.single-column {
    grid-template-columns: 1fr;
    max-width: 900px;
    margin: 0 auto;
}

/* ============== Header ============== */
.header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-primary);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.auth-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.user-name {
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* ============== Sidebar ============== */
.sidebar {
    position: sticky;
    top: 80px;
    height: fit-content;
}

.sidebar-section {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

.sidebar-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
}

.filter-list {
    list-style: none;
}

.filter-list li {
    margin-bottom: 0.25rem;
}

.filter-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition);
}

.filter-link:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
}

.filter-link.active {
    background-color: var(--color-primary);
    color: white;
}

.filter-badge {
    font-size: 0.75rem;
    padding: 0.125rem 0.5rem;
    background-color: var(--color-bg-tertiary);
    border-radius: 9999px;
    color: var(--color-text-muted);
}

.filter-link.active .filter-badge {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

/* ============== Content ============== */
.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
}

/* ============== Articles ============== */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.article-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: all var(--transition);
}

.article-card:hover {
    border-color: var(--color-border-dark);
    box-shadow: var(--shadow-md);
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.8125rem;
}

.article-source {
    font-weight: 600;
    color: var(--color-primary);
}

.article-category {
    background-color: var(--color-bg-tertiary);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
}

.article-date {
    color: var(--color-text-muted);
}

/* Sentiment badges */
.article-sentiment {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-size: 0.8125rem;
}

.sentiment-emotion {
    font-size: 1.25rem;
    line-height: 1;
    cursor: help;
}

.sentiment-score {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.75rem;
}

.sentiment-score.sentiment-positive {
    background-color: rgba(34, 197, 94, 0.15);
    color: var(--color-success);
}

.sentiment-score.sentiment-negative {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--color-error);
}

.sentiment-score.sentiment-neutral {
    background-color: rgba(100, 116, 139, 0.15);
    color: var(--color-secondary);
}

.article-title {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.article-title a {
    color: var(--color-text);
}

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

.article-summary {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.article-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ============== Buttons ============== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

.btn.btn-icon {
    padding: 0.5rem;
}

.btn.btn-icon svg {
    width: 18px;
    height: 18px;
}

.bookmark-btn {
    color: var(--color-text-muted);
}

.bookmark-btn:hover,
.bookmark-btn.bookmarked {
    color: var(--color-warning);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============== Pagination ============== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.pagination-info {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ============== Empty State ============== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-icon {
    width: 64px;
    height: 64px;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.empty-state h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

/* ============== Setup Message ============== */
.setup-message {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}

.setup-content h2 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

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

.setup-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

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

.setup-content code {
    background-color: var(--color-bg);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.setup-content a {
    color: var(--color-primary);
    text-decoration: underline;
}

.setup-content a:hover {
    color: var(--color-primary-dark);
}

/* ============== Error Page ============== */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
}

.error-code {
    font-size: 6rem;
    font-weight: 800;
    color: var(--color-text-muted);
    line-height: 1;
}

.error-message {
    font-size: 1.5rem;
    margin: 1rem 0;
}

.error-description {
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

/* ============== Footer ============== */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ============== Loading States ============== */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

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

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

/* ============== Toast Notifications ============== */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background-color: var(--color-text);
    color: var(--color-bg);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
}

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

.toast.error {
    background-color: var(--color-error);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(1rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============== Responsive ============== */
@media (max-width: 768px) {
    .page-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
        display: flex;
        gap: 1rem;
        overflow-x: auto;
        padding-bottom: 1rem;
    }
    
    .sidebar-section {
        flex-shrink: 0;
        min-width: 200px;
        margin-bottom: 0;
    }
    
    .header-content {
        flex-wrap: wrap;
    }
    
    .nav {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: 0.5rem;
        border-top: 1px solid var(--color-border);
        margin-top: 0.5rem;
    }
    
    .content-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .article-card {
        padding: 1rem;
    }
    
    .article-title {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .logo {
        font-size: 1.125rem;
    }
    
    .user-name {
        display: none;
    }
    
    .article-meta {
        font-size: 0.75rem;
    }
    
    .pagination {
        flex-direction: column;
    }
}