@import url('https://fonts.googleapis.com/css2?family=Special+Elite&family=Share+Tech+Mono&display=swap');

/* ── variables ── */
:root {
    --bg:        #1a1a14;
    --bg2:       #222218;
    --cream:     #e8dcc8;
    --olive:     #6b7c3a;
    --olive-lt:  #8a9e4a;
    --amber:     #c8a84b;
    --muted:     #8a8a7a;
    --border:    #3a3a2a;
    --font-head: 'Special Elite', cursive;
    --font-mono: 'Share Tech Mono', monospace;
}

/* ── light theme ── */
[data-theme="light"] {
    --bg:       #f5f0e8;
    --bg2:      #ede8de;
    --cream:    #2a2a1a;
    --olive:    #5a6b2a;
    --olive-lt: #6b7c3a;
    --amber:    #8a6a1a;
    --muted:    #7a7a6a;
    --border:   #c8c0a8;
}

/* ── reset ── */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    background-color: var(--bg);
    color: var(--cream);
    font-family: var(--font-mono);
    font-size: 15px;
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--olive-lt);
    text-decoration: none;
}

a:hover { color: var(--amber); }

/* ── nav ── */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    border-bottom: 1px solid var(--border);
    background-color: var(--bg2);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-head);
    font-size: 1.2rem;
    color: var(--cream);
}

.nav-brand a {
    color: var(--cream);
    letter-spacing: 2px;
}

.nav-callsign {
    color: var(--olive-lt);
    font-size: 1.4rem;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--muted);
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: lowercase;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--amber); }

/* ── nav right group ── */
.nav-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ── theme toggle ── */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 1rem;
    padding: 4px 10px;
    cursor: pointer;
    font-family: var(--font-mono);
    transition: all 0.2s;
    line-height: 1;
}

.theme-toggle:hover {
    border-color: var(--olive);
    color: var(--olive-lt);
}

/* ── hamburger ── */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: 1px solid var(--border);
    padding: 6px 8px;
    cursor: pointer;
    width: 36px;
    height: 36px;
}

.hamburger span {
    display: block;
    width: 18px;
    height: 2px;
    background-color: var(--muted);
    transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── typing cursor ── */
.cursor {
    color: var(--olive-lt);
    animation: blink 1s step-end infinite;
    font-weight: bold;
}

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

/* ── main ── */
.main-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 20px;
    flex: 1;
    width: 100%;
}

/* ── hero ── */
.hero {
    text-align: center;
    padding: 80px 0 60px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.hero-patch {
    display: inline-block;
    border: 2px solid var(--olive);
    color: var(--olive-lt);
    font-size: 0.7rem;
    letter-spacing: 6px;
    padding: 4px 16px;
    margin-bottom: 24px;
}

.hero-title {
    font-family: var(--font-head);
    font-size: 3rem;
    color: var(--cream);
    letter-spacing: 4px;
    margin-bottom: 12px;
}

.hero-sub {
    color: var(--muted);
    font-size: 0.9rem;
    letter-spacing: 2px;
    margin-bottom: 40px;
}

.hero-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 8px 20px;
    font-size: 0.8rem;
    letter-spacing: 1px;
    transition: all 0.2s;
}

.btn:hover {
    border-color: var(--olive);
    color: var(--olive-lt);
    background-color: var(--bg2);
}

/* ── section title ── */
.section-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--olive-lt);
    letter-spacing: 3px;
    margin-bottom: 30px;
    font-weight: normal;
}

/* ── post card ── */
.post-card {
    padding: 24px 0;
    border-bottom: 1px solid var(--border);
}

.post-date {
    font-size: 0.75rem;
    color: var(--muted);
    letter-spacing: 2px;
    display: block;
    margin-bottom: 6px;
}

.post-title {
    font-family: var(--font-head);
    font-size: 1.3rem;
    color: var(--cream);
    letter-spacing: 1px;
    display: block;
    margin-bottom: 8px;
}

.post-title:hover { color: var(--amber); }

.post-summary {
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.6;
}

/* ── blog list ── */
.post-list { margin-top: 10px; }

/* ── single post ── */
.single-post { max-width: 700px; }

.post-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.post-header h1 {
    font-family: var(--font-head);
    font-size: 2rem;
    color: var(--cream);
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.post-meta {
    color: var(--muted);
    font-size: 0.8rem;
    letter-spacing: 2px;
}

.post-content h1,
.post-content h2,
.post-content h3 {
    font-family: var(--font-head);
    color: var(--cream);
    margin: 32px 0 16px;
    letter-spacing: 1px;
}

.post-content p { margin-bottom: 16px; color: var(--cream); }

.post-content code {
    background: var(--bg2);
    color: var(--olive-lt);
    padding: 2px 6px;
    border: 1px solid var(--border);
    font-family: var(--font-mono);
}

.post-content pre {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--olive);
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
}

.post-content a { color: var(--olive-lt); }
.post-content a:hover { color: var(--amber); }

/* ── about ── */
.about-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.about-header h1 {
    font-family: var(--font-head);
    font-size: 2rem;
    letter-spacing: 3px;
    color: var(--cream);
}

.about-content p {
    color: var(--cream);
    margin-bottom: 16px;
    line-height: 1.8;
}

.social-links {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.social-links a {
    border: 1px solid var(--border);
    padding: 6px 16px;
    font-size: 0.8rem;
    color: var(--muted);
    letter-spacing: 1px;
    transition: all 0.2s;
}

.social-links a:hover {
    border-color: var(--olive);
    color: var(--olive-lt);
}

/* ── footer ── */
footer {
    border-top: 1px solid var(--border);
    padding: 20px 40px;
    background-color: var(--bg2);
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--muted);
    font-size: 0.8rem;
    letter-spacing: 1px;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--amber); }

/* ── projects ── */
.project-card {
    padding: 24px;
    border: 1px solid var(--border);
    margin-bottom: 20px;
    background-color: var(--bg2);
    transition: border-color 0.2s;
}

.project-card:hover { border-color: var(--olive); }

.project-card h3 {
    font-family: var(--font-head);
    color: var(--cream);
    font-size: 1.2rem;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.project-card p {
    color: var(--muted);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.project-link {
    font-size: 0.8rem;
    color: var(--olive-lt);
    letter-spacing: 1px;
}

/* ── research ── */
.section-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.section-sub {
    color: var(--muted);
    font-size: 0.85rem;
    letter-spacing: 2px;
    margin-top: 8px;
}

.research-card {
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
}

.research-meta {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 8px;
}

.research-tag {
    font-size: 0.7rem;
    letter-spacing: 3px;
    color: var(--olive-lt);
    border: 1px solid var(--olive);
    padding: 2px 10px;
    text-transform: uppercase;
}

.research-title {
    font-family: var(--font-head);
    font-size: 1.4rem;
    color: var(--cream);
    letter-spacing: 1px;
    display: block;
    margin-bottom: 10px;
}

.research-title:hover { color: var(--amber); }

.research-abstract {
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.7;
    margin-bottom: 12px;
}

.research-read {
    font-size: 0.8rem;
    color: var(--olive-lt);
    letter-spacing: 1px;
}

.research-read:hover { color: var(--amber); }

/* ── research paper ── */
.research-paper { max-width: 700px; }

.paper-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.paper-tag {
    display: inline-block;
    font-size: 0.7rem;
    letter-spacing: 3px;
    color: var(--olive-lt);
    border: 1px solid var(--olive);
    padding: 2px 10px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.paper-header h1 {
    font-family: var(--font-head);
    font-size: 2rem;
    color: var(--cream);
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.paper-meta {
    display: flex;
    gap: 16px;
    align-items: center;
    color: var(--muted);
    font-size: 0.8rem;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.paper-status {
    color: var(--olive-lt);
    border: 1px solid var(--border);
    padding: 2px 8px;
    font-size: 0.75rem;
}

.paper-abstract {
    background-color: var(--bg2);
    border-left: 3px solid var(--olive);
    padding: 16px 20px;
    color: var(--cream);
    font-size: 0.85rem;
    line-height: 1.8;
}

/* ── contact ── */
.contact-form {
    max-width: 600px;
    margin-top: 40px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    color: var(--olive-lt);
    font-size: 0.8rem;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background-color: var(--bg2);
    color: var(--cream);
    border: 1px solid var(--border);
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--olive);
}

.btn-submit {
    background-color: transparent;
    color: var(--olive-lt);
    border: 1px solid var(--olive);
    padding: 10px 30px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-submit:hover {
    background-color: var(--olive);
    color: var(--bg);
}

.form-success {
    color: var(--olive-lt);
    border: 1px solid var(--olive);
    padding: 12px 20px;
    margin-bottom: 24px;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.form-error {
    color: #cc4444;
    border: 1px solid #cc4444;
    padding: 12px 20px;
    margin-bottom: 24px;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

/* ── responsive ── */
@media (max-width: 768px) {
    .nav {
        flex-wrap: wrap;
        padding: 16px 20px;
    }

    .nav-brand a { font-size: 1rem; }

    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 0;
        margin-top: 10px;
        border-top: 1px solid var(--border);
        padding-top: 10px;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links li {
        padding: 8px 0;
        border-bottom: 1px solid var(--border);
    }

    .nav-links a { font-size: 0.9rem; }

    .hero { padding: 40px 0 30px; }
    .hero-title { font-size: 2rem; }
    .hero-links { flex-direction: column; align-items: center; }
    .btn { width: 200px; text-align: center; }
    .main-content { padding: 30px 16px; }
    .footer-content { flex-direction: column; gap: 10px; text-align: center; }
    .research-meta { flex-direction: column; gap: 8px; }
    .paper-meta { flex-direction: column; gap: 8px; }
}
/* ── search button ── */
.search-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 1.1rem;
    padding: 4px 10px;
    cursor: pointer;
    font-family: var(--font-mono);
    transition: all 0.2s;
    line-height: 1;
}
.search-btn:hover {
    border-color: var(--olive);
    color: var(--olive-lt);
}

/* ── overlay ── */
.search-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    z-index: 100;
}
.search-overlay.active { display: block; }

/* ── modal ── */
.search-modal {
    display: none;
    position: fixed;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 600px;
    background: var(--bg2);
    border: 1px solid var(--olive);
    z-index: 101;
    max-height: 70vh;
    overflow: hidden;
    flex-direction: column;
}
.search-modal.active { display: flex; }

.search-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}
.search-label {
    color: var(--olive-lt);
    font-size: 0.75rem;
    letter-spacing: 3px;
}
.search-hint {
    color: var(--muted);
    font-size: 0.7rem;
    letter-spacing: 2px;
}

.search-input-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
}
.search-prompt { color: var(--olive-lt); font-size: 0.9rem; }
.search-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--cream);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    letter-spacing: 1px;
}
.search-input::placeholder { color: var(--muted); }

/* ── results ── */
.search-results {
    overflow-y: auto;
    max-height: calc(70vh - 100px);
}
.search-result-item {
    display: block;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    transition: background 0.15s;
    color: var(--cream);
}
.search-result-item:hover,
.search-result-item.selected {
    background: var(--bg);
    border-left: 3px solid var(--olive);
    padding-left: 13px;
}
.search-result-top {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 4px;
}
.search-result-title {
    font-family: var(--font-head);
    font-size: 1rem;
    color: var(--cream);
    letter-spacing: 1px;
}
.search-result-section {
    font-size: 0.65rem;
    letter-spacing: 2px;
    color: var(--olive-lt);
    border: 1px solid var(--olive);
    padding: 1px 6px;
    text-transform: uppercase;
}
.search-result-date {
    font-size: 0.7rem;
    color: var(--muted);
    letter-spacing: 1px;
    margin-bottom: 4px;
}
.search-result-summary {
    font-size: 0.8rem;
    color: var(--muted);
    line-height: 1.5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.search-empty {
    padding: 24px 16px;
    color: var(--muted);
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-align: center;
}
/* ── sitemap page ── */
.sitemap-page { max-width: 680px; }

.sitemap-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.sitemap-sub {
    color: var(--muted);
    font-size: 0.85rem;
    letter-spacing: 2px;
    margin-top: 8px;
}

.sitemap-section {
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.sitemap-section-label {
    font-size: 0.7rem;
    letter-spacing: 4px;
    color: var(--olive-lt);
    text-transform: uppercase;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.sitemap-count {
    font-size: 0.65rem;
    color: var(--muted);
    border: 1px solid var(--border);
    padding: 1px 8px;
    letter-spacing: 2px;
}

.sitemap-links {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sitemap-link {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 10px 12px;
    border: 1px solid transparent;
    transition: all 0.15s;
    gap: 16px;
}

.sitemap-link:hover {
    border-color: var(--border);
    background: var(--bg2);
    border-left: 2px solid var(--olive);
    padding-left: 11px;
}

.sitemap-link-name {
    color: var(--cream);
    font-size: 0.9rem;
    letter-spacing: 1px;
    font-family: var(--font-head);
}

.sitemap-link-url {
    color: var(--muted);
    font-size: 0.72rem;
    letter-spacing: 1px;
    white-space: nowrap;
}

.sitemap-link-date {
    color: var(--muted);
    font-size: 0.72rem;
    letter-spacing: 1px;
    white-space: nowrap;
}
/* ── print stylesheet ── */
@media print {

    /* reset colors to black on white */
    :root {
        --bg:       #ffffff;
        --bg2:      #ffffff;
        --cream:    #000000;
        --olive:    #000000;
        --olive-lt: #000000;
        --amber:    #000000;
        --muted:    #444444;
        --border:   #cccccc;
    }

    body {
        background: #ffffff;
        color: #000000;
        font-family: 'Georgia', serif;
        font-size: 12pt;
        line-height: 1.6;
    }

    /* hide everything except main content */
    header,
    footer,
    .search-overlay,
    .search-modal,
    .nav,
    .hamburger,
    .theme-toggle,
    .search-btn,
    .paper-tag,
    .research-read,
    .btn,
    .btn-rss,
    .btn-rss-ghost {
        display: none !important;
    }

    /* page margins */
    @page {
        margin: 2.5cm 3cm;
        size: A4;
    }

    /* main content full width */
    .main-content {
        max-width: 100%;
        padding: 0;
        margin: 0;
    }

    /* research paper specific */
    .research-paper {
        max-width: 100%;
    }

    .paper-header {
        border-bottom: 2px solid #000000;
        padding-bottom: 20pt;
        margin-bottom: 24pt;
    }

    .paper-header h1 {
        font-family: 'Georgia', serif;
        font-size: 20pt;
        color: #000000;
        letter-spacing: 0;
        margin-bottom: 8pt;
        line-height: 1.3;
    }

    .paper-meta {
        font-size: 10pt;
        color: #444444;
        letter-spacing: 0;
        margin-bottom: 16pt;
        gap: 8px;
    }

    .paper-status {
        border: 1px solid #444444;
        color: #444444;
        font-size: 9pt;
        padding: 1px 6px;
    }

    .paper-abstract {
        background: #f5f5f5;
        border-left: 3px solid #000000;
        padding: 12pt 16pt;
        color: #000000;
        font-size: 10.5pt;
        line-height: 1.7;
        margin-bottom: 24pt;
    }

    /* body content */
    .post-content h1,
    .post-content h2,
    .post-content h3 {
        font-family: 'Georgia', serif;
        color: #000000;
        letter-spacing: 0;
        margin: 20pt 0 10pt;
        page-break-after: avoid;
    }

    .post-content h2 { font-size: 14pt; border-bottom: 1px solid #cccccc; padding-bottom: 4pt; }
    .post-content h3 { font-size: 12pt; }

    .post-content p {
        color: #000000;
        margin-bottom: 10pt;
        text-align: justify;
        orphans: 3;
        widows: 3;
    }

    .post-content pre {
        background: #f5f5f5;
        border: 1px solid #cccccc;
        border-left: 3px solid #000000;
        padding: 10pt 14pt;
        font-size: 9pt;
        overflow: visible;
        white-space: pre-wrap;
        word-break: break-all;
        page-break-inside: avoid;
        margin: 12pt 0;
    }

    .post-content code {
        background: #f5f5f5;
        border: 1px solid #cccccc;
        color: #000000;
        padding: 1pt 4pt;
        font-size: 9pt;
    }

    .post-content a {
        color: #000000;
        text-decoration: none;
    }

    /* show URL after links in print */
    .post-content a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 8pt;
        color: #666666;
    }

    /* don't show URL for internal links */
    .post-content a[href^="/"]:after {
        content: none;
    }

    /* page break rules */
    h2, h3 { page-break-after: avoid; }
    pre, blockquote { page-break-inside: avoid; }

    /* print header — shown only when printing */
    .print-header {
        display: block !important;
        text-align: center;
        border-bottom: 1px solid #cccccc;
        padding-bottom: 12pt;
        margin-bottom: 24pt;
        font-size: 9pt;
        color: #666666;
        letter-spacing: 1px;
    }

    /* print footer with page numbers */
    .print-footer {
        display: block !important;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        text-align: center;
        font-size: 9pt;
        color: #666666;
        border-top: 1px solid #cccccc;
        padding-top: 6pt;
    }
}

/* hide print-only elements on screen */
.print-header,
.print-footer {
    display: none;
}

/* ── print button (screen only) ── */
.print-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 2px;
    padding: 3px 10px;
    cursor: pointer;
    transition: all 0.2s;
    margin-left: auto;
}

.print-btn:hover {
    border-color: var(--olive);
    color: var(--olive-lt);
}

@media print {
    .print-btn { display: none !important; }
}
/* ── reading time + word count ── */
.post-divider {
    color: var(--border);
    margin: 0 2px;
}

.post-updated {
    color: var(--olive-lt);
    font-size: 0.75rem;
    letter-spacing: 1px;
    border: 1px solid var(--border);
    padding: 1px 6px;
}

/* ── back to top button ── */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    background: var(--bg2);
    border: 1px solid var(--olive);
    color: var(--olive-lt);
    font-family: var(--font-mono);
    font-size: 1rem;
    width: 38px;
    height: 38px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--olive);
    color: var(--bg);
}

@media print {
    .back-to-top { display: none !important; }
}

/* ── copy code button ── */
.code-block-wrap {
    position: relative;
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 1px;
    padding: 3px 8px;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s;
}

.code-block-wrap:hover .copy-code-btn {
    opacity: 1;
}

.copy-code-btn:hover {
    border-color: var(--olive);
    color: var(--olive-lt);
}

.copy-code-btn.copied {
    border-color: var(--olive);
    color: var(--olive-lt);
    opacity: 1;
}

@media print {
    .copy-code-btn { display: none !important; }
}
/* ── concorde background ── */
.concorde-bg {
    position: absolute;
    top: 0;
    right: -40px;
    width: 80%;
    max-width: 860px;
    pointer-events: none;
    z-index: 0;
    opacity: 1;
}

.concorde-svg {
    width: 100%;
    height: auto;
    color: var(--olive);
    opacity: 0.15;
    display: block;
}

/* light theme — slightly more visible */
[data-theme="light"] .concorde-svg {
    opacity: 0.08;
}

/* hero needs relative positioning for absolute child */
.hero {
    position: relative;
    overflow: hidden;
}

/* content stays above SVG */
.hero > *:not(.concorde-bg) {
    position: relative;
    z-index: 1;
}

@media (max-width: 768px) {
    .concorde-bg {
        width: 100%;
        opacity: 0.04;
    }
}

@media print {
    .concorde-bg { display: none; }
}