/**
 * Peptide News Feed — Public Styles
 *
 * Clean, modern news feed layout without thumbnails.
 * Focuses on readability and content hierarchy.
 *
 * @since 2.0.0
 */

/* ── Feed container ────────────────────────────────────────────── */
.pn-news-feed {
    max-width: 760px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    color: #1a1a2e;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Articles list ─────────────────────────────────────────────── */
.pn-articles-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ── Individual article ────────────────────────────────────────── */
.pn-article {
    padding: 1.5rem 0;
    border-bottom: 1px solid #e8eaed;
    transition: background-color 0.15s ease;
}

.pn-article:first-child {
    padding-top: 0;
}

.pn-article:last-child {
    border-bottom: none;
}

/* ── Meta line (source · date) ─────────────────────────────────── */
.pn-article-meta {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 0.375rem;
    font-size: 0.8125rem;
    color: #6b7280;
    line-height: 1.4;
}

.pn-source {
    font-weight: 600;
    color: #4b5563;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 0.75rem;
}

.pn-separator {
    color: #d1d5db;
}

.pn-date {
    color: #9ca3af;
}

/* ── Title ─────────────────────────────────────────────────────── */
.pn-article-title {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
    margin: 0 0 0.5rem;
    color: #111827;
}

.pn-article-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.15s ease;
}

.pn-article-title a:hover {
    color: #2563eb;
}

.pn-article-title a:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
    border-radius: 2px;
}

/* ── Excerpt / AI summary ──────────────────────────────────────── */
.pn-article-excerpt {
    font-size: 0.9375rem;
    line-height: 1.65;
    color: #4b5563;
    margin: 0 0 0.625rem;
}

/* ── Author ────────────────────────────────────────────────────── */
.pn-author {
    display: inline-block;
    font-size: 0.8125rem;
    color: #9ca3af;
    margin-bottom: 0.375rem;
}

.pn-author::before {
    content: "By ";
    font-style: italic;
}

/* ── Tags ──────────────────────────────────────────────────────── */
.pn-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: 0.375rem;
}

.pn-tag {
    display: inline-block;
    font-size: 0.6875rem;
    background: #eff6ff;
    color: #1d4ed8;
    padding: 0.1875rem 0.625rem;
    border-radius: 100px;
    line-height: 1.5;
    font-weight: 500;
    letter-spacing: 0.01em;
}

/* ── Loading skeleton ──────────────────────────────────────────── */
.pn-loading {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.pn-skeleton-card {
    padding: 1.5rem 0;
    border-bottom: 1px solid #e8eaed;
}

.pn-skeleton-card:first-child {
    padding-top: 0;
}

.pn-skeleton-line {
    background: linear-gradient(90deg, #f3f4f6 25%, #e5e7eb 50%, #f3f4f6 75%);
    background-size: 200% 100%;
    animation: pn-shimmer 1.5s ease-in-out infinite;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.pn-skeleton-meta {
    width: 140px;
    height: 14px;
}

.pn-skeleton-title {
    width: 85%;
    height: 20px;
}

.pn-skeleton-excerpt {
    width: 100%;
    height: 14px;
}

.pn-skeleton-excerpt-short {
    width: 60%;
    height: 14px;
}

.pn-skeleton-tags {
    display: flex;
    gap: 0.375rem;
    margin-top: 0.5rem;
}

.pn-skeleton-tag {
    width: 64px;
    height: 22px;
    border-radius: 100px;
    background: linear-gradient(90deg, #f3f4f6 25%, #e5e7eb 50%, #f3f4f6 75%);
    background-size: 200% 100%;
    animation: pn-shimmer 1.5s ease-in-out infinite;
}

@keyframes pn-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ── Error state ───────────────────────────────────────────────── */
.pn-error {
    text-align: center;
    padding: 2.5rem 1rem;
    color: #6b7280;
}

.pn-error p {
    font-size: 0.9375rem;
    margin: 0 0 1rem;
}

.pn-retry-btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #2563eb;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.pn-retry-btn:hover {
    background: #dbeafe;
    border-color: #93c5fd;
}

.pn-retry-btn:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

/* ── Empty state ───────────────────────────────────────────────── */
.pn-empty {
    text-align: center;
    padding: 2.5rem 1rem;
}

.pn-empty p {
    font-size: 0.9375rem;
    color: #6b7280;
    margin: 0;
}

/* ── Pagination ────────────────────────────────────────────────── */
.pn-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem 0 0.5rem;
    margin-top: 0.5rem;
    border-top: 1px solid #e8eaed;
}

.pn-page-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    background: #fff;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
    line-height: 1;
}

.pn-page-btn:hover:not(:disabled) {
    background: #f9fafb;
    border-color: #9ca3af;
}

.pn-page-btn:disabled {
    color: #d1d5db;
    border-color: #e5e7eb;
    cursor: not-allowed;
}

.pn-page-btn:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

.pn-page-info {
    font-size: 0.8125rem;
    color: #6b7280;
    min-width: 100px;
    text-align: center;
}

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 600px) {
    .pn-article-title {
        font-size: 1rem;
    }

    .pn-article-excerpt {
        font-size: 0.875rem;
    }

    .pn-pagination {
        gap: 0.5rem;
    }

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

/* ── Dark mode support via prefers-color-scheme ────────────────── */
@media (prefers-color-scheme: dark) {
    .pn-news-feed {
        color: #e5e7eb;
    }

    .pn-article {
        border-bottom-color: #374151;
    }

    .pn-article-title {
        color: #f3f4f6;
    }

    .pn-article-title a:hover {
        color: #60a5fa;
    }

    .pn-source {
        color: #9ca3af;
    }

    .pn-article-excerpt {
        color: #9ca3af;
    }

    .pn-tag {
        background: #1e3a5f;
        color: #93c5fd;
    }

    .pn-skeleton-line,
    .pn-skeleton-tag {
        background: linear-gradient(90deg, #1f2937 25%, #374151 50%, #1f2937 75%);
        background-size: 200% 100%;
    }

    .pn-page-btn {
        color: #e5e7eb;
        background: #1f2937;
        border-color: #4b5563;
    }

    .pn-page-btn:hover:not(:disabled) {
        background: #374151;
    }

    .pn-page-btn:disabled {
        color: #4b5563;
        border-color: #374151;
    }

    .pn-retry-btn {
        color: #60a5fa;
        background: #1e3a5f;
        border-color: #1d4ed8;
    }

    .pn-pagination {
        border-top-color: #374151;
    }

    .pn-skeleton-card {
        border-bottom-color: #374151;
    }
}