*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

a { color: inherit; text-decoration: none; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--serif);  /* Spectral */
    background: var(--bg);
    color: var(--text);
    font-size: 1.18rem;
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
}

nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(1.5rem, 5vw, 3.5rem);
    background: var(--nav-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-logo {
    font-family: var(--display);
    font-style: italic;
    color: var(--accent);
    text-decoration: none;
    font-size: 1.1rem;
}

.nav-back {
    font-family: var(--sans);
    font-variant-caps: small-caps;
    letter-spacing: 0.06em;
    font-size: 0.88rem;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-back:hover { color: var(--text); }

main {
    max-width: 720px;
    margin: 0 auto;
    padding: calc(var(--nav-h) + 5rem) clamp(1.5rem, 5vw, 3.5rem) 6rem;
}

.breadcrumb {
    position: static;
    height: auto;
    background: none;
    border: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    padding: 0;
    font-family: var(--sans);
    font-size: 0.78rem;
    font-variant-caps: all-small-caps;
    letter-spacing: 0.08em;
    color: var(--faint);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

.breadcrumb a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.breadcrumb a:hover { color: var(--accent); }

.breadcrumb .bc-sep { color: var(--border); font-style: normal; }

.breadcrumb .bc-cur { color: var(--text); }

.art-eyebrow {
    font-family: var(--sans);
    font-variant-caps: all-small-caps;
    letter-spacing: 0.12em;
    font-size: 0.88rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.art-tag {
    font-family: var(--sans);
    border: 1px solid var(--faint);
    padding: 0.1rem 0.5rem;
}

h1 {
    font-family: var(--display);
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 400;
    line-height: 1.2;
    color: var(--text);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

h1 em { font-style: italic; color: var(--accent); }

.art-meta {
    font-family: var(--sans);
    font-size: 0.88rem;
    color: var(--faint);
    font-variant-caps: all-small-caps;
    letter-spacing: 0.07em;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.art-body p {
    color: var(--muted);
    margin-bottom: 1.3rem;
    font-size: 1.05rem;
    line-height: 1.9;
}

.art-body p .hl   { color: var(--text); }
.art-body p .hl-r { color: var(--accent); }

.art-body h2 {
    font-size: 1.2rem;
    font-weight: 400;
    font-variant-caps: small-caps;
    letter-spacing: 0.08em;
    color: var(--text);
    margin: 2.5rem 0 0.85rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid var(--border);
}

.art-body blockquote {
    font-style: italic;
    font-size: 1.05rem;
    color: var(--muted);
    padding-left: 1.5rem;
    border-left: 2px solid var(--accent);
    margin: 1.75rem 0;
    line-height: 1.9;
}

.art-body blockquote cite {
    display: block;
    font-style: normal;
    font-variant-caps: small-caps;
    font-size: 0.82rem;
    letter-spacing: 0.05em;
    color: var(--faint);
    margin-top: 0.5rem;
}

.math-block {
    display: block;
    text-align: center;
    font-style: italic;
    color: var(--text);
    font-size: 1.1rem;
    margin: 1.75rem 0;
    padding: 1rem 1.5rem;
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    background: var(--bg2);
    line-height: 1.7;
}

.draft-notice {
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    background: var(--bg2);
    font-size: 1rem;
    color: var(--muted);
    line-height: 1.8;
}

.draft-notice strong {
    color: var(--text);
    font-weight: 400;
    font-style: italic;
}

footer {
    padding: 2rem clamp(1.5rem, 5vw, 3.5rem);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

footer p {
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--muted);
    font-variant-caps: small-caps;
    letter-spacing: 0.04em;
}

footer a { color: var(--faint); text-decoration: none; transition: color 0.2s; }
footer a:hover { color: var(--accent); }

/* ── READING PROGRESS ─────────────────────── */
#reading-progress {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    height: 2px;
    width: 0%;
    background: var(--accent);
    z-index: 200;
    transition: width 0.12s ease-out;
}

/* ── TABLE OF CONTENTS ────────────────────── */
.toc {
    font-family: var(--sans);
    font-size: 0.82rem;
    color: var(--faint);
    border: 1px solid var(--border);
    border-left: 3px solid var(--border);
    padding: 1rem 1.25rem;
    margin-bottom: 2.5rem;
    background: var(--bg2);
}

.toc-label {
    font-variant-caps: all-small-caps;
    letter-spacing: 0.1em;
    font-size: 0.72rem;
    color: var(--faint);
    margin-bottom: 0.55rem;
}

.toc ol {
    list-style: decimal;
    padding-left: 1.25rem;
}

.toc li { line-height: 1.6; }

.toc a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.toc a:hover { color: var(--accent); }
.toc a.toc-active { color: var(--accent); }

/* ── BLOCKQUOTE HOVER ─────────────────────── */
.art-body blockquote {
    transition: border-left-color 0.25s, padding-left 0.25s;
}

.art-body blockquote:hover {
    border-left-color: var(--text);
    padding-left: 1.8rem;
}