/* ── Blog Public & Student Reader Styles ──────────────────────────────────── */
:root {
    --peach: #ff6e3b;
    --peach-glow: rgba(255,110,59,0.35);
    --peach-soft: rgba(255,110,59,0.12);
    --bg-dark: #0a0a0c;
    --bg-surface: #111114;
    --bg-card: rgba(22,22,28,0.75);
    --border-glass: rgba(255,255,255,0.07);
    --text-primary: #f0f0f2;
    --text-secondary: rgba(240,240,242,0.55);
    --text-muted: rgba(240,240,242,0.3);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.2s ease;
}

/* ── Reading progress bar ── */
#blog-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--peach), #ff9f6b);
    z-index: 9999;
    transition: width 0.1s linear;
}

/* ── Public nav ── */
.blog-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 60px;
    background: rgba(10,10,12,0.9);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glass);
}
.blog-nav-brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; }
.blog-nav-brand img { height: 28px; }
.blog-nav-links { display: flex; gap: 1.5rem; align-items: center; }
.blog-nav-links a {
    font-size: 0.875rem; color: var(--text-secondary); text-decoration: none;
    transition: color var(--transition);
}
.blog-nav-links a:hover, .blog-nav-links a.active { color: var(--text-primary); }
.blog-nav-cta {
    font-size: 0.8rem; font-weight: 600; color: var(--peach);
    border: 1px solid rgba(255,110,59,0.3); border-radius: 6px;
    padding: 0.35rem 0.9rem; text-decoration: none; transition: all var(--transition);
}
.blog-nav-cta:hover { background: var(--peach-soft); color: var(--peach) !important; }

/* ── Page wrapper ── */
.blog-page { min-height: 100vh; background: var(--bg-dark); color: var(--text-primary); font-family: var(--font); }

/* ── Hero / Featured posts ── */
.blog-hero { padding: 3.5rem 2rem 2.5rem; max-width: 1200px; margin: 0 auto; }
.blog-hero-title { font-size: 2.25rem; font-weight: 800; margin: 0 0 0.4rem; letter-spacing: -0.02em; }
.blog-hero-sub { font-size: 1rem; color: var(--text-secondary); margin: 0 0 2.5rem; }

.featured-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    grid-template-rows: auto auto;
    gap: 1rem;
}
.featured-card {
    position: relative; border-radius: var(--radius-lg); overflow: hidden;
    background: var(--bg-card); border: 1px solid var(--border-glass);
    text-decoration: none; display: block; transition: transform var(--transition), box-shadow var(--transition);
}
.featured-card:hover { transform: translateY(-3px); box-shadow: 0 16px 40px rgba(0,0,0,0.4); }
.featured-card--main { grid-row: span 2; }
.featured-card__img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; }
.featured-card--main .featured-card__img { aspect-ratio: 4/3; }
.featured-card__body { padding: 1.25rem 1.5rem 1.5rem; }
.featured-card--main .featured-card__body { padding: 1.5rem 2rem 2rem; }
.featured-card__category {
    display: inline-block; font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--peach); background: var(--peach-soft);
    border-radius: 4px; padding: 0.2rem 0.55rem; margin-bottom: 0.65rem;
}
.featured-card__title {
    font-size: 1rem; font-weight: 700; color: var(--text-primary);
    line-height: 1.4; margin: 0 0 0.5rem;
}
.featured-card--main .featured-card__title { font-size: 1.4rem; }
.featured-card__meta { display: flex; gap: 1rem; font-size: 0.75rem; color: var(--text-muted); }

/* ── Filters bar ── */
.blog-filters {
    max-width: 1200px; margin: 0 auto;
    padding: 0 2rem 1.5rem;
    display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center;
}
.blog-search-wrap { position: relative; flex: 1 1 260px; }
.blog-search-wrap svg { position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%); width: 15px; height: 15px; color: var(--text-muted); pointer-events: none; }
.blog-search {
    width: 100%; padding: 0.6rem 0.85rem 0.6rem 2.4rem; font-size: 0.85rem;
    background: var(--bg-surface); border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm); color: var(--text-primary); outline: none;
    transition: border-color var(--transition);
}
.blog-search:focus { border-color: rgba(255,110,59,0.4); }
.blog-search::placeholder { color: var(--text-muted); }

.blog-cat-pills { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.blog-pill {
    font-size: 0.78rem; font-weight: 500; padding: 0.35rem 0.85rem;
    border-radius: 100px; border: 1px solid var(--border-glass);
    color: var(--text-secondary); background: transparent; cursor: pointer;
    text-decoration: none; transition: all var(--transition);
}
.blog-pill:hover { border-color: rgba(255,110,59,0.3); color: var(--peach); }
.blog-pill.active { background: var(--peach-soft); border-color: rgba(255,110,59,0.3); color: var(--peach); }

/* ── Main content layout ── */
.blog-content-wrap { max-width: 1200px; margin: 0 auto; padding: 0 2rem 4rem; display: grid; grid-template-columns: 1fr 280px; gap: 2rem; }

/* ── Post grid ── */
.blog-post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.25rem; }
.blog-empty { grid-column: 1/-1; text-align: center; padding: 4rem 1rem; color: var(--text-secondary); }
.blog-empty svg { width: 48px; height: 48px; margin-bottom: 1rem; opacity: 0.3; }

.post-card {
    background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md);
    overflow: hidden; text-decoration: none; display: flex; flex-direction: column;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.post-card:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(0,0,0,0.35); border-color: rgba(255,110,59,0.2); }
.post-card__img { width: 100%; aspect-ratio: 16/9; object-fit: cover; display: block; }
.post-card__img-placeholder { width: 100%; aspect-ratio: 16/9; background: var(--bg-surface); display: flex; align-items: center; justify-content: center; }
.post-card__img-placeholder svg { width: 32px; height: 32px; opacity: 0.2; }
.post-card__body { padding: 1.1rem 1.25rem 1.3rem; display: flex; flex-direction: column; flex: 1; }
.post-card__category {
    font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--peach); margin-bottom: 0.5rem;
}
.post-card__title { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); line-height: 1.4; margin: 0 0 0.6rem; }
.post-card__excerpt { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; margin: 0; flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.post-card__footer { display: flex; align-items: center; justify-content: space-between; margin-top: 1rem; padding-top: 0.75rem; border-top: 1px solid var(--border-glass); }
.post-card__author { font-size: 0.75rem; color: var(--text-muted); display: flex; align-items: center; gap: 0.4rem; }
.post-card__author-avatar { width: 20px; height: 20px; border-radius: 50%; background: var(--peach-soft); display: flex; align-items: center; justify-content: center; font-size: 0.6rem; font-weight: 700; color: var(--peach); }
.post-card__read-time { font-size: 0.72rem; color: var(--text-muted); }

/* ── Sidebar ── */
.blog-sidebar { display: flex; flex-direction: column; gap: 1.5rem; }
.sidebar-widget { background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md); padding: 1.25rem; }
.sidebar-widget__title { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin: 0 0 1rem; }
.sidebar-cat-item { display: flex; justify-content: space-between; align-items: center; padding: 0.45rem 0; border-bottom: 1px solid var(--border-glass); text-decoration: none; }
.sidebar-cat-item:last-child { border-bottom: none; }
.sidebar-cat-item__name { font-size: 0.83rem; color: var(--text-secondary); transition: color var(--transition); }
.sidebar-cat-item:hover .sidebar-cat-item__name { color: var(--text-primary); }
.sidebar-cat-item__count { font-size: 0.72rem; background: var(--bg-surface); padding: 0.1rem 0.5rem; border-radius: 100px; color: var(--text-muted); }
.sidebar-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.sidebar-tag { font-size: 0.75rem; padding: 0.25rem 0.7rem; border-radius: 100px; border: 1px solid var(--border-glass); color: var(--text-secondary); text-decoration: none; transition: all var(--transition); }
.sidebar-tag:hover { border-color: rgba(255,110,59,0.3); color: var(--peach); }

/* ── Pagination ── */
.blog-pagination { display: flex; gap: 0.5rem; align-items: center; justify-content: center; margin-top: 2.5rem; }
.page-btn {
    width: 36px; height: 36px; border-radius: var(--radius-sm); border: 1px solid var(--border-glass);
    background: transparent; color: var(--text-secondary); font-size: 0.82rem; font-weight: 500;
    text-decoration: none; display: flex; align-items: center; justify-content: center;
    transition: all var(--transition); cursor: pointer;
}
.page-btn:hover { border-color: rgba(255,110,59,0.3); color: var(--peach); }
.page-btn.active { background: var(--peach-soft); border-color: rgba(255,110,59,0.3); color: var(--peach); }
.page-btn.disabled { opacity: 0.3; pointer-events: none; }
.page-ellipsis { color: var(--text-muted); font-size: 0.85rem; padding: 0 0.25rem; }

/* ── Post Detail Page ── */
.blog-detail-layout { max-width: 1200px; margin: 0 auto; padding: 2.5rem 2rem 4rem; display: grid; grid-template-columns: 1fr 260px; gap: 3rem; align-items: start; }
.blog-detail-main { min-width: 0; }
.blog-detail-sidebar { position: sticky; top: 80px; display: flex; flex-direction: column; gap: 1.5rem; }

/* breadcrumb */
.blog-breadcrumb { display: flex; gap: 0.5rem; align-items: center; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 1.75rem; flex-wrap: wrap; }
.blog-breadcrumb a { color: var(--text-muted); text-decoration: none; }
.blog-breadcrumb a:hover { color: var(--text-secondary); }
.blog-breadcrumb-sep { opacity: 0.4; }

/* Post header */
.post-header__category { display: inline-block; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--peach); background: var(--peach-soft); border-radius: 4px; padding: 0.2rem 0.6rem; margin-bottom: 1rem; text-decoration: none; }
.post-header__title { font-size: 2rem; font-weight: 800; line-height: 1.25; letter-spacing: -0.025em; margin: 0 0 1.25rem; }
.post-header__meta { display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: center; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border-glass); margin-bottom: 1.75rem; }
.post-meta-author { display: flex; align-items: center; gap: 0.6rem; }
.post-meta-avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--peach-soft); display: flex; align-items: center; justify-content: center; font-size: 0.7rem; font-weight: 700; color: var(--peach); flex-shrink: 0; }
.post-meta-author-name { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); }
.post-meta-date { font-size: 0.8rem; color: var(--text-muted); }
.post-meta-item { display: flex; align-items: center; gap: 0.35rem; font-size: 0.78rem; color: var(--text-muted); }
.post-meta-item svg { width: 14px; height: 14px; }

/* Featured image */
.post-featured-image { width: 100%; border-radius: var(--radius-md); margin-bottom: 2rem; object-fit: cover; max-height: 480px; }

/* Post body typography */
.post-body { font-size: 1rem; line-height: 1.8; color: rgba(240,240,242,0.88); }
.post-body h2 { font-size: 1.5rem; font-weight: 700; margin: 2.25rem 0 0.9rem; letter-spacing: -0.02em; color: var(--text-primary); }
.post-body h3 { font-size: 1.2rem; font-weight: 600; margin: 1.75rem 0 0.7rem; color: var(--text-primary); }
.post-body h4 { font-size: 1rem; font-weight: 600; margin: 1.5rem 0 0.6rem; color: var(--text-primary); }
.post-body p { margin: 0 0 1.25rem; }
.post-body a { color: var(--peach); text-decoration: underline; text-decoration-color: rgba(255,110,59,0.35); text-underline-offset: 3px; }
.post-body a:hover { text-decoration-color: var(--peach); }
.post-body ul, .post-body ol { margin: 0 0 1.25rem 1.5rem; }
.post-body li { margin-bottom: 0.4rem; }
.post-body blockquote { margin: 1.75rem 0; padding: 1rem 1.5rem; border-left: 3px solid var(--peach); background: var(--peach-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-style: italic; color: rgba(240,240,242,0.8); }
.post-body code { background: rgba(255,255,255,0.08); padding: 0.15em 0.45em; border-radius: 4px; font-size: 0.88em; font-family: 'Fira Code', 'Consolas', monospace; }
.post-body pre { background: #0d0d10; border: 1px solid var(--border-glass); border-radius: var(--radius-sm); padding: 1.25rem; overflow-x: auto; margin: 1.5rem 0; }
.post-body pre code { background: none; padding: 0; }
.post-body img { max-width: 100%; border-radius: var(--radius-sm); margin: 1rem 0; }
.post-body table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.9rem; }
.post-body th { background: var(--bg-surface); padding: 0.6rem 1rem; text-align: left; font-weight: 600; border-bottom: 1px solid var(--border-glass); }
.post-body td { padding: 0.55rem 1rem; border-bottom: 1px solid var(--border-glass); }
.post-body hr { border: none; border-top: 1px solid var(--border-glass); margin: 2rem 0; }

/* Tags */
.post-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border-glass); }
.post-tag { font-size: 0.78rem; padding: 0.3rem 0.8rem; border-radius: 100px; border: 1px solid var(--border-glass); color: var(--text-secondary); text-decoration: none; transition: all var(--transition); }
.post-tag:hover { border-color: rgba(255,110,59,0.3); color: var(--peach); }

/* Social share */
.post-share { display: flex; align-items: center; gap: 0.75rem; margin: 1.75rem 0; padding: 1rem 1.25rem; background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md); }
.post-share__label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); margin-right: 0.25rem; }
.share-btn {
    display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.78rem; font-weight: 500;
    padding: 0.4rem 0.9rem; border-radius: 6px; text-decoration: none; border: 1px solid var(--border-glass);
    color: var(--text-secondary); background: transparent; cursor: pointer; transition: all var(--transition);
}
.share-btn:hover { border-color: rgba(255,110,59,0.3); color: var(--text-primary); background: var(--bg-surface); }
.share-btn svg { width: 14px; height: 14px; flex-shrink: 0; }
.share-btn--copy.copied { color: #4ade80; border-color: rgba(74,222,128,0.3); }

/* Prev/Next */
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2.5rem; }
.post-nav-item {
    background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md);
    padding: 1rem 1.25rem; text-decoration: none; transition: all var(--transition);
}
.post-nav-item:hover { border-color: rgba(255,110,59,0.2); }
.post-nav-item--next { text-align: right; }
.post-nav-item__dir { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.35rem; display: flex; align-items: center; gap: 0.3rem; }
.post-nav-item--next .post-nav-item__dir { justify-content: flex-end; }
.post-nav-item__title { font-size: 0.87rem; font-weight: 600; color: var(--text-primary); line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* TOC sidebar widget */
.toc-widget { background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md); padding: 1.25rem; }
.toc-widget__title { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin: 0 0 0.85rem; }
.toc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.2rem; }
.toc-item a { font-size: 0.82rem; color: var(--text-secondary); text-decoration: none; display: block; padding: 0.3rem 0.5rem; border-radius: 4px; transition: all var(--transition); line-height: 1.4; border-left: 2px solid transparent; }
.toc-item a:hover { color: var(--text-primary); background: rgba(255,255,255,0.03); }
.toc-item a.toc-active { color: var(--peach); border-left-color: var(--peach); background: var(--peach-soft); }
.toc-item--h3 a { padding-left: 1.1rem; }
.toc-item--h4 a { padding-left: 1.9rem; font-size: 0.78rem; }

/* Author card */
.author-card { background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md); padding: 1.5rem; display: flex; gap: 1rem; align-items: flex-start; margin-top: 2rem; }
.author-card__avatar { width: 48px; height: 48px; border-radius: 50%; background: var(--peach-soft); display: flex; align-items: center; justify-content: center; font-size: 1rem; font-weight: 700; color: var(--peach); flex-shrink: 0; }
.author-card__name { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.2rem; }
.author-card__type { font-size: 0.75rem; color: var(--text-muted); }

/* Related posts */
.related-section { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border-glass); }
.related-section__title { font-size: 1.1rem; font-weight: 700; margin: 0 0 1.25rem; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1rem; }

/* Comments */
.comments-section { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border-glass); }
.comments-section__title { font-size: 1.1rem; font-weight: 700; margin: 0 0 1.5rem; }
.comment-item { padding: 1rem 0; border-bottom: 1px solid var(--border-glass); }
.comment-item:last-child { border-bottom: none; }
.comment-meta { display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.6rem; }
.comment-avatar { width: 28px; height: 28px; border-radius: 50%; background: var(--bg-surface); display: flex; align-items: center; justify-content: center; font-size: 0.65rem; font-weight: 700; color: var(--text-secondary); }
.comment-author { font-size: 0.82rem; font-weight: 600; }
.comment-date { font-size: 0.73rem; color: var(--text-muted); }
.comment-body { font-size: 0.88rem; color: rgba(240,240,242,0.8); line-height: 1.6; }
.comment-form { margin-top: 2rem; padding: 1.5rem; background: var(--bg-card); border: 1px solid var(--border-glass); border-radius: var(--radius-md); }
.comment-form__title { font-size: 0.88rem; font-weight: 600; margin: 0 0 1rem; }
.comment-form textarea { width: 100%; background: var(--bg-surface); border: 1px solid var(--border-glass); border-radius: var(--radius-sm); padding: 0.75rem 1rem; color: var(--text-primary); font-size: 0.875rem; font-family: var(--font); resize: vertical; min-height: 100px; outline: none; transition: border-color var(--transition); box-sizing: border-box; }
.comment-form textarea:focus { border-color: rgba(255,110,59,0.4); }
.comment-form__submit { margin-top: 0.75rem; padding: 0.55rem 1.25rem; background: var(--peach); border: none; border-radius: var(--radius-sm); color: #fff; font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: opacity var(--transition); }
.comment-form__submit:hover { opacity: 0.88; }
.comment-login-prompt { padding: 1rem; background: var(--bg-surface); border-radius: var(--radius-sm); font-size: 0.85rem; color: var(--text-secondary); text-align: center; }
.comment-login-prompt a { color: var(--peach); text-decoration: none; }

/* Alert */
.blog-alert { padding: 0.75rem 1rem; border-radius: var(--radius-sm); font-size: 0.85rem; margin-bottom: 1rem; }
.blog-alert--success { background: rgba(74,222,128,0.1); border: 1px solid rgba(74,222,128,0.25); color: #4ade80; }
.blog-alert--error { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.25); color: #f87171; }

/* ── Responsive ── */
@media (max-width: 900px) {
    .featured-grid { grid-template-columns: 1fr; }
    .featured-card--main { grid-row: auto; }
    .blog-content-wrap { grid-template-columns: 1fr; }
    .blog-sidebar { display: none; }
    .blog-detail-layout { grid-template-columns: 1fr; }
    .blog-detail-sidebar { position: static; display: none; }
    .post-nav { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
    .blog-hero { padding: 2rem 1rem 1.5rem; }
    .blog-hero-title { font-size: 1.6rem; }
    .blog-filters, .blog-content-wrap { padding-left: 1rem; padding-right: 1rem; }
    .blog-detail-layout { padding: 1.5rem 1rem 3rem; }
    .post-header__title { font-size: 1.5rem; }
    .blog-nav { padding: 0 1rem; }
}