/* ===================================================
   BLOG / NEWS — engineering/space theme
   Builds on styles.css variables (--primary, --accent, etc.)
=================================================== */

.blog-body { padding-top: 0; }

.blog-wrap,
.post-wrap {
    position: relative;
    z-index: 2;
    padding: 120px 0 80px;
    min-height: 100vh;
}

/* ---------- Blog hero ---------- */
.blog-hero {
    text-align: center;
    margin-bottom: 36px;
}
.blog-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: 4px;
    color: #fff;
    margin: 12px 0 14px;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
}
.blog-hero-title .hl { color: var(--primary); }
.blog-hero-sub {
    max-width: 640px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}
.blog-hero-meta {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-top: 18px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--primary);
    letter-spacing: 1px;
}
.blog-hero-meta i { margin-right: 6px; }

/* ---------- Search ---------- */
.blog-search {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 620px;
    margin: 0 auto 24px;
    background: rgba(8, 13, 24, 0.7);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 6px 6px 6px 16px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.blog-search:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,212,255,0.15); }
.blog-search > i { color: var(--text-secondary); }
.blog-search input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    padding: 8px 0;
}
.blog-search input::placeholder { color: rgba(138,153,173,0.6); }
.blog-search button {
    background: var(--primary);
    color: var(--dark);
    border: none;
    border-radius: 7px;
    padding: 9px 18px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    cursor: pointer;
    transition: box-shadow .2s ease, filter .2s ease;
}
.blog-search button:hover { box-shadow: 0 0 16px rgba(0,212,255,0.5); filter: brightness(1.05); }

/* ---------- Category filter ---------- */
.blog-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px;
}
.blog-filter-btn {
    --cat-color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    border: 1px solid var(--border);
    border-radius: 99px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 1px;
    text-decoration: none;
    transition: all .2s ease;
    background: rgba(8,13,24,0.5);
}
.blog-filter-btn i { color: var(--cat-color); }
.blog-filter-btn:hover {
    border-color: var(--cat-color);
    color: #fff;
    transform: translateY(-2px);
}
.blog-filter-btn.active {
    background: var(--cat-color);
    border-color: var(--cat-color);
    color: var(--dark);
    font-weight: 700;
}
.blog-filter-btn.active i { color: var(--dark); }

.blog-result-note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}
.blog-result-note a { color: var(--primary); }

/* ---------- Category chip ---------- */
.blog-cat-chip {
    --cat-color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.64rem;
    letter-spacing: 1.2px;
    font-weight: 700;
    color: var(--cat-color);
    border: 1px solid color-mix(in srgb, var(--cat-color) 45%, transparent);
    background: color-mix(in srgb, var(--cat-color) 10%, transparent);
    padding: 3px 10px;
    border-radius: 4px;
    width: fit-content;
}

/* ---------- Featured ---------- */
.blog-featured {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 0;
    background: rgba(8,13,24,0.6);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 34px;
    text-decoration: none;
    color: inherit;
    transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.blog-featured:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 18px 44px rgba(0,212,255,0.15);
}
.blog-featured-img { position: relative; min-height: 280px; }
.blog-featured-img img { width: 100%; height: 100%; object-fit: cover; }
.blog-featured-flag {
    position: absolute; top: 14px; left: 14px;
    background: var(--accent-yellow);
    color: #111;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 4px 10px;
    border-radius: 4px;
}
.blog-featured-body { padding: 30px; display: flex; flex-direction: column; gap: 12px; }
.blog-featured-body h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: #fff;
    line-height: 1.3;
}
.blog-featured-body p { color: var(--text-secondary); line-height: 1.7; }

/* ---------- Grid + cards ---------- */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 22px;
}
.blog-card {
    display: flex;
    flex-direction: column;
    background: rgba(8,13,24,0.6);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition: border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.blog-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0,212,255,0.14);
}
.blog-card-img { position: relative; aspect-ratio: 16 / 9; overflow: hidden; }
.blog-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.blog-card:hover .blog-card-img img { transform: scale(1.06); }
.blog-noimg {
    width: 100%; height: 100%;
    display: grid; place-items: center;
    background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(125,76,255,0.08));
    color: var(--primary);
    font-size: 2.2rem;
}
.blog-type-flag,
.blog-featured .blog-type-flag {
    position: absolute; top: 12px; right: 12px;
    background: rgba(5,8,16,0.8);
    border: 1px solid var(--primary);
    color: var(--primary);
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 1px;
    padding: 3px 8px;
    border-radius: 4px;
}
.blog-card-body { padding: 18px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.blog-card-body h3 {
    font-size: 1.08rem;
    color: #fff;
    line-height: 1.4;
    font-weight: 600;
}
.blog-card-body p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.blog-card-meta {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    padding-top: 6px;
}
.blog-card-meta i { margin-right: 4px; color: var(--primary); }
.blog-read-more { margin-left: auto; color: var(--primary); font-weight: 700; letter-spacing: 1px; }

.blog-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}
.blog-empty i { font-size: 2.6rem; color: var(--primary); margin-bottom: 16px; }
.blog-empty p { margin-bottom: 18px; }

/* ===================================================
   SINGLE POST
=================================================== */
.post-progress {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: transparent;
    z-index: 1200;
}
.post-progress span {
    display: block;
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    box-shadow: 0 0 10px var(--primary);
}

.post-container { max-width: 1120px; }

.post-crumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    margin-bottom: 22px;
    color: var(--text-secondary);
}
.post-crumb a { color: var(--primary); text-decoration: none; }
.post-crumb a:hover { text-decoration: underline; }

.post-header { margin-bottom: 24px; }
.post-title {
    font-family: var(--font-heading);
    font-size: clamp(1.7rem, 4vw, 2.6rem);
    color: #fff;
    line-height: 1.25;
    margin: 12px 0 14px;
}
.post-lead {
    color: var(--text-secondary);
    font-size: 1.08rem;
    line-height: 1.7;
    max-width: 760px;
}
.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 18px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-secondary);
}
.post-meta i { color: var(--primary); margin-right: 5px; }
.post-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.post-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--primary);
    background: rgba(0,212,255,0.07);
    border: 1px solid rgba(0,212,255,0.2);
    padding: 3px 10px;
    border-radius: 4px;
}

.post-cover {
    border-radius: 14px;
    overflow: hidden;
    margin-bottom: 30px;
    border: 1px solid var(--border);
}
.post-cover img { width: 100%; max-height: 460px; object-fit: cover; }

/* ---------- Layout: TOC + content ---------- */
.post-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 40px;
    align-items: start;
}
.post-content.full { grid-column: 1 / -1; }

.post-toc { position: sticky; top: 100px; }
.post-toc-inner {
    background: rgba(8,13,24,0.7);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}
.post-toc-inner h4 {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 12px;
}
.post-toc-inner h4 i { margin-right: 6px; }
.post-toc-inner ol { list-style: none; counter-reset: toc; margin: 0; padding: 0; }
.post-toc-inner li { counter-increment: toc; margin-bottom: 4px; }
.post-toc-inner .toc-link {
    display: block;
    padding: 6px 10px 6px 30px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.84rem;
    line-height: 1.4;
    border-radius: 6px;
    border-left: 2px solid transparent;
    text-decoration: none;
    transition: all .15s ease;
}
.post-toc-inner .toc-link::before {
    content: counter(toc, decimal-leading-zero);
    position: absolute; left: 8px;
    font-family: var(--font-mono);
    font-size: 0.66rem;
    color: var(--primary);
    opacity: 0.7;
}
.post-toc-inner .toc-link:hover { background: rgba(0,212,255,0.06); color: #fff; }
.post-toc-inner .toc-link.active {
    background: rgba(0,212,255,0.1);
    color: #fff;
    border-left-color: var(--primary);
}

/* ---------- Content body ---------- */
.post-content { min-width: 0; }
.post-section { margin-bottom: 36px; scroll-margin-top: 96px; }
.post-h2 {
    font-family: var(--font-heading);
    font-size: 1.45rem;
    color: #fff;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
}
.post-h2 .anchor-link {
    opacity: 0;
    color: var(--primary);
    font-size: 0.8rem;
    transition: opacity .15s ease;
}
.post-h2:hover .anchor-link { opacity: 0.8; }

.post-body { color: var(--text-secondary); font-size: 1.02rem; line-height: 1.85; }
.post-body p { margin-bottom: 16px; }
.post-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.post-body a:hover { color: #fff; }

.post-figure {
    margin: 22px 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: rgba(8,13,24,0.5);
}
.post-figure img { width: 100%; display: block; }
.post-figure figcaption {
    padding: 10px 16px;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    color: var(--text-secondary);
    text-align: center;
    border-top: 1px solid var(--border);
}

/* ---------- Code blocks ---------- */
.post-code {
    margin: 22px 0;
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    background: #060a14;
}
.post-code-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: rgba(0,212,255,0.05);
    border-bottom: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--primary);
    letter-spacing: 1px;
}
.code-copy {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 5px;
    padding: 4px 10px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    cursor: pointer;
    transition: all .15s ease;
}
.code-copy:hover { border-color: var(--primary); color: var(--primary); }
.code-copy.copied { color: var(--accent); border-color: var(--accent); }
.post-code pre {
    margin: 0;
    padding: 16px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.86rem;
    line-height: 1.6;
    color: #cfe9ff;
}
.post-code pre code { white-space: pre; }

.post-paper-cta {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 18px 20px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(0,212,255,0.05);
    margin: 30px 0;
}
.post-paper-cta > i { font-size: 1.6rem; color: var(--primary); }
.post-paper-cta strong { display: block; color: #fff; }
.post-paper-cta span { font-size: 0.82rem; color: var(--text-secondary); }
.post-paper-cta .btn-outline-eng { margin-left: auto; white-space: nowrap; }

.post-share {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 36px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
}
.post-share a, .post-copy-link {
    width: 36px; height: 36px;
    display: grid; place-items: center;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    background: transparent;
    cursor: pointer;
    transition: all .15s ease;
    text-decoration: none;
}
.post-share a:hover, .post-copy-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.post-related { margin-top: 56px; }
.post-related-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    letter-spacing: 2px;
    color: #fff;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}
.post-empty-note { color: var(--text-secondary); }

/* ===================================================
   RESPONSIVE
=================================================== */
@media (max-width: 900px) {
    .post-layout { grid-template-columns: 1fr; }
    .post-toc {
        position: static;
        margin-bottom: 24px;
    }
    .post-toc-inner { padding: 14px; }
    .blog-featured { grid-template-columns: 1fr; }
    .blog-featured-img { min-height: 200px; aspect-ratio: 16/9; }
}

@media (max-width: 600px) {
    .blog-wrap, .post-wrap { padding: 100px 0 60px; }
    .blog-hero-meta { gap: 16px; flex-wrap: wrap; }
    .blog-search { flex-wrap: wrap; }
    .post-paper-cta { flex-direction: column; align-items: flex-start; }
    .post-paper-cta .btn-outline-eng { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
    .blog-card, .blog-featured, .blog-card-img img { transition: none; }
}


/* ===================================================
   PROJECT CASE-STUDY (project.php) extras
=================================================== */
.proj-detail-header { margin-bottom: 26px; }
.proj-spec-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 22px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(8,13,24,0.6);
}
.proj-spec {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 90px;
    padding-right: 16px;
    border-right: 1px solid var(--border);
}
.proj-spec:last-child { border-right: none; padding-right: 0; }
.proj-spec .ps-k {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
}
.proj-spec .ps-v {
    font-family: var(--font-mono);
    font-size: 0.86rem;
    color: #fff;
    font-weight: 600;
}
.proj-detail-actions { margin-top: 20px; }

@media (max-width: 600px) {
    .proj-spec { min-width: 70px; padding-right: 12px; }
}