/* ============================================
   PERSPECTIVE — markdown writing section
   Inherits the "Quant Terminal Editorial" palette
   from style.css :root (dark default). Adds a
   light theme + long-form reading styles.
   ============================================ */

/* Syntax-highlight token colors (dark default) */
:root {
    --code-comment: #5a5a6e;
    --code-keyword: #00d4ff;
    --code-string: #7ee787;
    --code-number: #f0a868;
    --code-function: #c9a3ff;
    --code-title: #79c0ff;
    --code-attr: #ffa657;
    --code-builtin: #56d4dd;
}

/* ---------- Light theme (code-token overrides; base palette lives in style.css) ---------- */
[data-theme="light"] {
    --code-comment: #8a8a9e;
    --code-keyword: #00718c;
    --code-string: #1a7f37;
    --code-number: #b35900;
    --code-function: #6f42c1;
    --code-title: #0550ae;
    --code-attr: #953800;
    --code-builtin: #007695;
}

/* ---------- Base ---------- */
.perspective-body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.3s var(--ease-out-quart), color 0.3s var(--ease-out-quart);
}

/* ---------- Top bar ---------- */
.perspective-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 56px;
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(18px) saturate(1.6);
    -webkit-backdrop-filter: blur(18px) saturate(1.6);
    border-bottom: 1px solid var(--border);
}

.perspective-bar-logo {
    font-family: var(--font-display);
    font-size: 22px;
    letter-spacing: -0.02em;
    color: var(--text);
    transition: color 0.3s;
}

.perspective-bar-logo:hover { color: var(--accent); }

.perspective-bar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.perspective-bar-link {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    transition: color 0.3s;
}

.perspective-bar-link:hover { color: var(--accent); }

.perspective-theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.3s, border-color 0.3s, background 0.3s;
}

.perspective-theme-toggle:hover {
    color: var(--accent);
    border-color: var(--border-hover);
    background: var(--accent-glow);
}

.perspective-icon-sun, .perspective-icon-moon { display: none; align-items: center; }
[data-theme="dark"] .perspective-icon-sun { display: inline-flex; }
[data-theme="light"] .perspective-icon-moon { display: inline-flex; }

/* ---------- Layout ---------- */
.perspective-wrap {
    flex: 1;
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding: 64px 24px 96px;
}

.perspective-eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.perspective-tags { display: inline-flex; flex-wrap: wrap; gap: 8px; }

/* ---------- Tag filters (index) ---------- */
.perspective-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 36px;
}
.perspective-filter {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 100px;
    padding: 7px 16px;
    cursor: pointer;
    transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.perspective-filter:hover { color: var(--text); border-color: var(--border-hover); }
.perspective-filter.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-glow);
}

.perspective-tag {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 3px 9px;
    border: 1px solid var(--border);
    border-radius: 100px;
}

/* ---------- Article header ---------- */
.perspective-article-head { margin-bottom: 44px; }

.perspective-article-title {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(36px, 6vw, 54px);
    line-height: 1.08;
    letter-spacing: -0.02em;
    color: var(--text);
}

/* ---------- Long-form content ---------- */
.perspective-content {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 15px;
    line-height: 1.85;
    color: var(--text);
}

.perspective-content > * + * { margin-top: 24px; }

.perspective-content h2,
.perspective-content h3,
.perspective-content h4 {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    letter-spacing: -0.01em;
    line-height: 1.2;
    color: var(--text);
    margin-top: 52px;
}

.perspective-content h2 { font-size: 32px; }
.perspective-content h3 { font-size: 25px; }
.perspective-content h4 { font-size: 20px; }

.perspective-content p { color: var(--text); }

.perspective-content a {
    color: var(--accent);
    border-bottom: 1px solid transparent;
    transition: border-color 0.25s;
}
.perspective-content a:hover { border-bottom-color: var(--accent); }

.perspective-content strong { font-weight: 600; color: var(--text); }
.perspective-content em { font-style: italic; }

.perspective-content ul,
.perspective-content ol { padding-left: 24px; }
.perspective-content li { margin-top: 8px; }
.perspective-content li::marker { color: var(--text-dim); }

.perspective-content blockquote {
    border-left: 2px solid var(--accent);
    padding: 4px 0 4px 22px;
    color: var(--text-muted);
    font-style: italic;
}

.perspective-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 48px 0;
}

/* Inline code */
.perspective-content :not(pre) > code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1px 6px;
    color: var(--accent);
}

/* Code blocks */
.perspective-content pre {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 22px;
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.7;
}

.perspective-content pre code {
    font-family: var(--font-mono);
    background: none;
    border: none;
    padding: 0;
    color: var(--text);
}

/* Tables */
.perspective-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.perspective-content th,
.perspective-content td {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
}
.perspective-content th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 11px;
}

/* Figures / images */
.perspective-content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    border: 1px solid var(--border);
    display: block;
}
.perspective-content figure { margin: 32px 0; }
.perspective-content figure img { margin: 0 auto; }
.perspective-content figcaption {
    margin-top: 12px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
}

/* Footnotes / citations (marked-footnote output) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
.perspective-content .footnotes {
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
}
.perspective-content .footnotes ol { padding-left: 20px; }
.perspective-content .footnotes li { margin-top: 6px; }
.perspective-content a[data-footnote-ref],
.perspective-content sup a {
    border-bottom: none;
    color: var(--accent);
    font-weight: 500;
}

/* ---------- Author bio (end of every post, after citations) ---------- */
.perspective-author {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    margin-top: 56px;
    padding: 24px 26px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
}
.perspective-author-mark {
    flex: none;
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--accent);
    border-radius: 11px;
    color: var(--accent);
    font-family: var(--font-display);
    font-style: italic;
    font-size: 22px;
    line-height: 1;
}
.perspective-author-name {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text);
    margin-bottom: 8px;
}
.perspective-author-text {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-muted);
}

/* ---------- Index listing ---------- */
.perspective-index-head { margin-bottom: 48px; }
.perspective-index-title {
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(44px, 8vw, 72px);
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 16px;
}
.perspective-intro {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 14px;
    color: var(--text-muted);
    max-width: 48ch;
}

.perspective-list { list-style: none; }
.perspective-list-item { border-top: 1px solid var(--border); }
.perspective-list-item:last-child { border-bottom: 1px solid var(--border); }

.perspective-list-link {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 20px;
    padding: 26px 8px;
    transition: background 0.25s, padding-left 0.25s;
}
.perspective-list-link:hover {
    background: var(--accent-glow);
    padding-left: 16px;
}

.perspective-list-date {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-dim);
    padding-top: 4px;
}

.perspective-list-body { display: flex; flex-direction: column; gap: 8px; }
.perspective-list-title {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 26px;
    line-height: 1.15;
    color: var(--text);
    transition: color 0.25s;
}
.perspective-list-link:hover .perspective-list-title { color: var(--accent); }
.perspective-list-desc {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-muted);
}

.perspective-empty {
    font-family: var(--font-mono);
    color: var(--text-muted);
    font-size: 14px;
}

/* ---------- Footer ---------- */
.perspective-footer {
    text-align: center;
    padding: 32px 24px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.05em;
    color: var(--text-dim);
    border-top: 1px solid var(--border);
}

/* ---------- Syntax highlighting (highlight.js tokens) ---------- */
.hljs-comment, .hljs-quote { color: var(--code-comment); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-section, .hljs-doctag, .hljs-name { color: var(--code-keyword); }
.hljs-string, .hljs-meta .hljs-string, .hljs-regexp, .hljs-addition { color: var(--code-string); }
.hljs-number, .hljs-symbol, .hljs-bullet, .hljs-link { color: var(--code-number); }
.hljs-title.function_, .hljs-function .hljs-title { color: var(--code-function); }
.hljs-title, .hljs-title.class_, .hljs-class .hljs-title, .hljs-type, .hljs-selector-id, .hljs-selector-class { color: var(--code-title); }
.hljs-attr, .hljs-attribute, .hljs-variable, .hljs-template-variable, .hljs-property { color: var(--code-attr); }
.hljs-built_in, .hljs-builtin-name, .hljs-meta { color: var(--code-builtin); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 600; }
.hljs-deletion { color: #f08a8a; }

/* ---------- Responsive ---------- */
@media (max-width: 560px) {
    .perspective-list-link { grid-template-columns: 1fr; gap: 8px; }
    .perspective-list-date { padding-top: 0; }
    .perspective-wrap { padding: 44px 20px 72px; }
}