/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Light theme (default) */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --bg-hover: #ebebeb;
    --text-primary: #1a1a1a;
    --text-secondary: #555;
    --text-muted: #888;
    --link: #0066cc;
    --link-hover: #0052a3;
    --link-visited: #666;
    --border: #ddd;
    --accent: #e85a1b;
    --error: #d32f2f;
    --page-padding: 1rem;
}

/* Dark theme - follows system preference */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #121212;
        --bg-secondary: #1e1e1e;
        --bg-tertiary: #2d2d2d;
        --bg-hover: #333;
        --text-primary: #e0e0e0;
        --text-secondary: #999;
        --text-muted: #666;
        --link: #6cb6ff;
        --link-hover: #8fc9ff;
        --link-visited: #888;
        --border: #333;
        --accent: #ff6b35;
        --error: #ff5252;
    }
}

html {
    font-size: 15px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 0 var(--page-padding);
}

/* Site Header */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header h1 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.site-logo {
    width: 1.5rem;
    height: 1.5rem;
    flex-shrink: 0;
}

/* Buttons */
.refresh-btn,
.load-more-btn {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.4rem 0.85rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.refresh-btn:hover:not(:disabled),
.load-more-btn:hover:not(:disabled) {
    background-color: var(--bg-hover);
    border-color: #444;
}

.refresh-btn:disabled,
.load-more-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.refresh-btn.refreshing {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Last updated timestamp */
.last-updated {
    color: var(--text-muted);
    font-size: 0.65rem;
    margin-right: 0.75rem;
    opacity: 0.7;
}

#refresh-container {
    display: flex;
    align-items: center;
}

/* Main feed grid - 3 columns on desktop */
.feeds-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background-color: var(--border);
    flex: 1;
}

/* Feed column */
.feed-column {
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.feed-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0.85rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
}

.feed-header h2 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.feed-title-link {
    color: inherit;
    text-decoration: none;
    transition: color 0.15s ease;
}

.feed-title-link:hover {
    color: var(--link);
}

.feed-error {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background-color: var(--error);
    color: white;
    border-radius: 50%;
    font-size: 0.65rem;
    font-weight: bold;
}

/* Feed content wrapper */
.feed-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

/* Items list */
.items-list {
    list-style: none;
    flex: 1;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-tertiary) transparent;
}

.items-list::-webkit-scrollbar {
    width: 6px;
}

.items-list::-webkit-scrollbar-track {
    background: transparent;
}

.items-list::-webkit-scrollbar-thumb {
    background-color: var(--bg-tertiary);
    border-radius: 3px;
}

.item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
}

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

.item-link {
    flex: 1;
    color: var(--link);
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1.35;
    word-break: break-word;
}

.item-link:hover {
    color: var(--link-hover);
}

.item-link:visited {
    color: var(--link-visited);
}

.discussion-link {
    flex-shrink: 0;
    color: var(--text-muted);
    padding: 2px;
    margin-top: 1px;
    opacity: 0.6;
    transition: opacity 0.15s ease, color 0.15s ease;
}

.discussion-link:hover {
    color: var(--accent);
    opacity: 1;
}

/* Load more container */
.load-more-container,
.load-more-buttons {
    padding: 0.6rem 1rem;
    border-top: 1px solid var(--border);
    background-color: var(--bg-secondary);
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.load-more-btn {
    flex: 1;
    min-width: 0;
    padding: 0.5rem;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.no-more {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    color: var(--text-muted);
    font-size: 0.75rem;
    padding: 0.25rem;
}

/* Hidden utility class */
.hidden {
    display: none !important;
}

/* Extra items (loaded via Show More) */
.extra-item.hidden {
    display: none !important;
}

/* Site Footer */
.site-footer {
    padding: 0.6rem 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.7rem;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

/* Responsive: 1 column on mobile */
@media (max-width: 900px) {
    .feeds-grid {
        grid-template-columns: 1fr;
    }

    .feed-column {
        display: block;
        max-height: none;
    }

    .feed-content {
        display: block;
    }

    .items-list {
        overflow-y: visible;
        max-height: none;
    }

    .load-more-btn {
        min-height: 44px;
        padding: 0.75rem 1rem;
    }

    .load-more-container {
        flex-shrink: 0;
        position: relative;
        z-index: 10;
    }

    .site-header {
        padding: 0.6rem 1rem;
    }

    .site-header h1 {
        font-size: 1.1rem;
    }
}

/* Medium screens: 2 columns */
@media (min-width: 901px) and (max-width: 1200px) {
    .feeds-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Empty state */
.items-list:empty::after {
    content: 'No items yet';
    display: block;
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* HTMX loading state */
.htmx-request {
    opacity: 0.7;
    pointer-events: none;
}

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 2px;
}