/* ══════════════════════════════════════════════════════════
   OptiEdu Blog - Public Styles
   Zero JavaScript required on public pages.
   ══════════════════════════════════════════════════════════ */

:root {
    --blog-primary: #2a8d89;
    --blog-primary-dark: #1f6b68;
    --blog-bg: #f9fafb;
    --blog-card-bg: #ffffff;
    --blog-text: #1a1a2e;
    --blog-text-secondary: #555;
    --blog-muted: #888;
    --blog-border: #e8eaed;
    --blog-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
    --blog-shadow-hover: 0 2px 8px rgba(0,0,0,0.08), 0 8px 24px rgba(0,0,0,0.06);
    --blog-radius: 10px;
}

/* ── Blog Container ─────────────────────────────────────── */
.blog-container {
    max-width: 880px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* ── Blog List Header ───────────────────────────────────── */
.blog-list-header {
    text-align: center;
    margin-bottom: 50px;
}

.blog-list-header h1 {
    font-size: 2.4rem;
    color: var(--blog-text);
    margin: 0 0 10px 0;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.blog-list-header p {
    font-size: 1.1rem;
    color: var(--blog-text-secondary);
    margin: 0;
}

/* ── Blog Post Cards (List Page) ────────────────────────── */
.blog-post-card {
    background: var(--blog-card-bg);
    border-radius: var(--blog-radius);
    box-shadow: var(--blog-shadow);
    padding: 32px 36px;
    margin-bottom: 28px;
    transition: box-shadow 0.2s ease, transform 0.15s ease;
    border: 1px solid var(--blog-border);
}

.blog-post-card:hover {
    box-shadow: var(--blog-shadow-hover);
    transform: translateY(-1px);
}

.blog-post-card h2 {
    margin: 0 0 14px 0;
    font-size: 1.45rem;
    font-weight: 700;
    line-height: 1.4;
}

.blog-post-card h2 a {
    color: var(--blog-text);
    text-decoration: none;
}

.blog-post-card h2 a:hover {
    color: var(--blog-primary);
}

.blog-post-card .blog-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.blog-post-card .blog-meta .author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.blog-post-card .blog-meta .author-avatar-placeholder {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--blog-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
}

.blog-post-card .blog-meta .author-info {
    display: flex;
    flex-direction: column;
}

.blog-post-card .blog-meta .author-name {
    font-weight: 600;
    color: var(--blog-text);
    font-size: 0.95rem;
}

.blog-post-card .blog-meta .post-date {
    font-size: 0.82rem;
    color: var(--blog-muted);
}

.blog-post-card .blog-snippet {
    font-size: 1rem;
    color: var(--blog-text-secondary);
    line-height: 1.75;
    margin-bottom: 18px;
    max-height: 130px;
    overflow: hidden;
    position: relative;
}

/* fade-out gradient at the bottom of the truncated snippet */
.blog-post-card .blog-snippet::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: linear-gradient(to bottom, transparent, #fff);
    pointer-events: none;
}

.blog-post-card .blog-snippet img {
    max-height: 70px;
    width: auto;
    border-radius: 6px;
    margin: 4px 0;
    vertical-align: middle;
    display: inline;
}

.blog-post-card .blog-snippet p {
    margin: 0 0 0.5em 0;
}

.blog-post-card .blog-snippet p:last-child {
    margin-bottom: 0;
}

.blog-post-card .blog-read-more {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.15s;
}

.blog-post-card .blog-read-more:hover {
    color: var(--blog-primary-dark);
}

.blog-post-card .blog-meta-stats {
    display: flex;
    align-items: center;
    gap: 8px;
}

.blog-post-card .reading-time-badge {
    display: inline-block;
    background: #edf7f6;
    color: var(--blog-primary);
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
}

/* ── Blog Detail Page ───────────────────────────────────── */
.blog-detail {
    background: var(--blog-card-bg);
    border-radius: var(--blog-radius);
    box-shadow: var(--blog-shadow);
    padding: 40px 44px;
    border: 1px solid var(--blog-border);
}

.blog-detail h1 {
    font-size: 2.4rem;
    color: var(--blog-text);
    margin: 0 0 20px 0;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.3;
}

.blog-detail .blog-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    padding-bottom: 24px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--blog-border);
    flex-wrap: wrap;
}

.blog-detail .blog-meta .author-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.blog-detail .blog-meta .author-avatar-placeholder {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--blog-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 20px;
    flex-shrink: 0;
}

.blog-detail .blog-meta .author-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.blog-detail .blog-meta .author-name {
    font-weight: 700;
    color: var(--blog-text);
    font-size: 1.05rem;
}

.blog-detail .blog-meta .author-role {
    display: inline-block;
    background: #f0fdfa;
    color: var(--blog-primary);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.78rem;
    font-weight: 600;
}

.blog-detail .blog-meta .post-date {
    font-size: 0.85rem;
    color: var(--blog-muted);
}

.blog-detail .blog-meta .reading-time-badge {
    display: inline-block;
    background: #edf7f6;
    color: var(--blog-primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ── Blog Content Body ──────────────────────────────────── */
.blog-body {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--blog-text);
    word-wrap: break-word;
}

.blog-body p {
    margin: 0 0 1.4em 0;
}

.blog-body p:last-child {
    margin-bottom: 0;
}

.blog-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1.5em 0;
    display: block;
}

.blog-body pre {
    background: #1a1a2e;
    color: #e0e0e0;
    padding: 18px 22px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 1.5em 0;
}

.blog-body code {
    background: #f3f4f6;
    color: #d63384;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.92em;
}

.blog-body pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
}

.blog-body blockquote {
    border-left: 4px solid var(--blog-primary);
    margin: 1.5em 0;
    padding: 12px 20px;
    background: #f9fafb;
    border-radius: 0 8px 8px 0;
    color: var(--blog-text-secondary);
    font-style: italic;
}

.blog-body h2, .blog-body h3, .blog-body h4 {
    color: var(--blog-text);
    margin: 1.8em 0 0.6em 0;
}

.blog-body h2 { font-size: 1.5rem; }
.blog-body h3 { font-size: 1.25rem; }
.blog-body h4 { font-size: 1.1rem; }

.blog-body ul, .blog-body ol {
    margin: 0 0 1.4em 0;
    padding-left: 1.8em;
}

.blog-body li {
    margin-bottom: 0.5em;
}

.blog-body a {
    color: var(--blog-primary);
    text-decoration: underline;
}

/* ── Table of Contents (auto-generated) ──────────────────── */
.blog-body .blog-toc {
    background: #f8fafb;
    border: 1px solid var(--blog-border);
    border-radius: 8px;
    padding: 18px 22px;
    margin: 1.5em 0;
    font-size: 0.95rem;
    line-height: 1.7;
}

.blog-body .blog-toc > strong {
    display: block;
    font-size: 1.05rem;
    margin-bottom: 10px;
    color: var(--blog-text);
}

.blog-body .blog-toc ul {
    margin: 0;
    padding-left: 0;
    list-style: none;
}

.blog-body .blog-toc ul ul {
    padding-left: 1.4em;
}

.blog-body .blog-toc li {
    margin-bottom: 4px;
}

.blog-body .blog-toc li.toc-level-2 {
    font-weight: 600;
    margin-top: 4px;
}

.blog-body .blog-toc li.toc-level-3 {
    font-weight: 500;
    font-size: 0.92em;
}

.blog-body .blog-toc li.toc-level-4 {
    font-weight: 400;
    font-size: 0.88em;
    color: var(--blog-text-secondary);
}

.blog-body .blog-toc a {
    color: var(--blog-primary);
    text-decoration: none;
}

.blog-body .blog-toc a:hover {
    text-decoration: underline;
}

/* ── Post Navigation ────────────────────────────────────── */
.blog-post-nav {
    margin-top: 50px;
    padding-top: 28px;
    border-top: 1px solid var(--blog-border);
    display: flex;
    justify-content: space-between;
    gap: 24px;
}

.blog-post-nav a {
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 600;
}

.blog-post-nav a:hover {
    text-decoration: underline;
}

.blog-post-nav .nav-label {
    font-size: 0.82rem;
    color: var(--blog-muted);
    display: block;
    margin-bottom: 4px;
}

.blog-post-nav .nav-prev { flex: 1; }
.blog-post-nav .nav-next { flex: 1; text-align: right; }

/* ── Back Link ──────────────────────────────────────────── */
.blog-back-link {
    text-align: center;
    margin-top: 40px;
}

.blog-back-link a {
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 600;
}

.blog-back-link a:hover {
    text-decoration: underline;
}

/* ── Pagination ─────────────────────────────────────────── */
.blog-pagination {
    text-align: center;
    margin-top: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

.blog-pagination a {
    display: inline-block;
    padding: 10px 22px;
    background: var(--blog-card-bg);
    border: 1px solid var(--blog-border);
    border-radius: 8px;
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background 0.15s, border-color 0.15s;
}

.blog-pagination a:hover {
    background: #f0fdfa;
    border-color: var(--blog-primary);
}

.blog-pagination .page-info {
    color: var(--blog-muted);
    font-size: 0.9rem;
}

/* ── Empty State ────────────────────────────────────────── */
.blog-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--blog-muted);
}

.blog-empty h2 {
    font-size: 1.5rem;
    color: var(--blog-text-secondary);
    margin-bottom: 10px;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .blog-container {
        padding: 20px 16px;
    }

    .blog-list-header h1 {
        font-size: 1.8rem;
    }

    .blog-post-card {
        padding: 22px 20px;
    }

    .blog-post-card h2 {
        font-size: 1.2rem;
    }

    .blog-detail {
        padding: 24px 20px;
    }

    .blog-detail h1 {
        font-size: 1.8rem;
    }

    .blog-body {
        font-size: 1rem;
    }

    .blog-post-nav {
        flex-direction: column;
        gap: 16px;
    }

    .blog-post-nav .nav-next {
        text-align: left;
    }
}

/* ── Formatting Toolbar ──────────────────────────────────── */
.blog-toolbar {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 10px;
    background: #f1f3f4;
    border: 1px solid var(--blog-border);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    flex-wrap: wrap;
}

.blog-toolbar .toolbar-group {
    display: flex;
    align-items: center;
    gap: 2px;
}

.blog-toolbar .toolbar-sep {
    width: 1px;
    height: 24px;
    background: #d0d4d8;
    margin: 0 6px;
}

.blog-toolbar button.toolbar-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 32px;
    border: 1px solid transparent;
    border-radius: 6px;
    background: transparent;
    color: #444;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
    padding: 0;
    line-height: 1;
}

.blog-toolbar button.toolbar-btn:hover {
    background: #e2e5e8;
    border-color: #c8ccd0;
}

.blog-toolbar button.toolbar-btn.active {
    background: #d4e9e7;
    border-color: var(--blog-primary);
    color: var(--blog-primary);
}

.blog-toolbar button.toolbar-btn[title="Bold"] {
    font-family: Georgia, serif;
}

.blog-toolbar button.toolbar-btn[title="Italic"] {
    font-family: Georgia, serif;
    font-style: italic;
}

.blog-toolbar button.toolbar-btn[title="Underline"] {
    text-decoration: underline;
}

.blog-toolbar select.toolbar-select {
    height: 32px;
    padding: 0 8px;
    border: 1px solid #c8ccd0;
    border-radius: 6px;
    background: #fff;
    color: #444;
    font-size: 0.82rem;
    font-family: inherit;
    cursor: pointer;
    transition: border-color 0.12s;
}

.blog-toolbar select.toolbar-select:focus {
    outline: none;
    border-color: var(--blog-primary);
    box-shadow: 0 0 0 2px rgba(42, 141, 137, 0.12);
}

/* ── Blog Editor (Staff Page) ───────────────────────────── */
.blog-editor-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.blog-editor-container h1 {
    font-size: 1.8rem;
    color: var(--blog-text);
    margin-bottom: 20px;
}

.blog-editor-form {
    background: var(--blog-card-bg);
    border-radius: var(--blog-radius);
    padding: 30px 34px;
    box-shadow: var(--blog-shadow);
    border: 1px solid var(--blog-border);
}

.blog-editor-form .form-group {
    margin-bottom: 22px;
}

.blog-editor-form label {
    display: block;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--blog-text);
    font-size: 0.95rem;
}

.blog-editor-form label small {
    font-weight: 400;
    color: var(--blog-muted);
    font-size: 0.82rem;
}

.blog-editor-form .form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--blog-border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--blog-text);
    background: #fafbfc;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-sizing: border-box;
}

.blog-editor-form .form-control:focus {
    outline: none;
    border-color: var(--blog-primary);
    box-shadow: 0 0 0 3px rgba(42, 141, 137, 0.12);
    background: #fff;
}

.blog-editor-form textarea.form-control {
    min-height: 380px;
    resize: vertical;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
    line-height: 1.7;
    font-size: 0.93rem;
}

.blog-editor-hidden {
    /* hidden visually but still validated by browser - do NOT use display:none */
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
    padding: 0;
}

.blog-editable {
    min-height: 380px;
    padding: 14px 16px;
    border: 1px solid var(--blog-border);
    border-radius: 8px;
    background: #fafbfc;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--blog-text);
    overflow-y: auto;
    word-wrap: break-word;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-sizing: border-box;
    outline: none;
}

.blog-editable:focus {
    border-color: var(--blog-primary);
    box-shadow: 0 0 0 3px rgba(42, 141, 137, 0.12);
    background: #fff;
}

.blog-editable:empty::before {
    content: attr(placeholder);
    color: #999;
    pointer-events: none;
}

.blog-editable img {
    max-width: 100%;
    display: block;
    margin: 10px 0;
    border-radius: 8px;
}

.blog-editor-form .checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--blog-text);
    cursor: pointer;
}

.blog-editor-form .checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--blog-primary);
}

.blog-editor-form .btn-primary {
    background: var(--blog-primary);
    color: #fff;
    border: none;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s;
}

.blog-editor-form .btn-primary:hover {
    background: var(--blog-primary-dark);
}

.blog-editor-image-upload {
    margin-bottom: 22px;
}

.blog-editor-image-upload .btn-upload {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #fff;
    color: var(--blog-primary);
    border: 2px dashed var(--blog-primary);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background 0.15s, border-color 0.15s;
}

.blog-editor-image-upload .btn-upload:hover {
    background: #f0fdfa;
    border-color: var(--blog-primary-dark);
}

/* ── Staff Post List ────────────────────────────────────── */
.blog-staff-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.blog-staff-container .staff-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.blog-staff-container .staff-header h1 {
    font-size: 1.8rem;
    color: var(--blog-text);
    margin: 0;
}

.blog-staff-container .btn-new-post {
    background: var(--blog-primary);
    color: #fff;
    padding: 10px 22px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    transition: background 0.15s;
}

.blog-staff-container .btn-new-post:hover {
    background: var(--blog-primary-dark);
}

.blog-staff-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--blog-card-bg);
    border-radius: var(--blog-radius);
    box-shadow: var(--blog-shadow);
    overflow: hidden;
    border: 1px solid var(--blog-border);
}

.blog-staff-table th {
    background: #f8f9fa;
    text-align: left;
    padding: 14px 18px;
    font-weight: 700;
    color: var(--blog-text);
    font-size: 0.85rem;
    border-bottom: 1px solid var(--blog-border);
}

.blog-staff-table td {
    padding: 14px 18px;
    border-bottom: 1px solid #f3f4f6;
    font-size: 0.93rem;
}

.blog-staff-table tr:last-child td {
    border-bottom: none;
}

.blog-staff-table .status-badge {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.blog-staff-table .status-published {
    background: #d4edda;
    color: #155724;
}

.blog-staff-table .status-draft {
    background: #fff3cd;
    color: #856404;
}

.blog-staff-table .action-link {
    color: var(--blog-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.blog-staff-table .action-link:hover {
    text-decoration: underline;
}

.blog-staff-table .action-sep {
    margin: 0 10px;
    color: #ccc;
}

.blog-staff-table .action-delete {
    color: #dc3545;
}

.blog-staff-table .action-delete:hover {
    color: #a71d2a;
    text-decoration: underline;
}