/* Oxford Academic Editorial Palette */
:root {
    --bg: #FCFBF8;
    --card-bg: #FFFFFF;
    --text: #1C2024;
    --muted: #525866;
    --border: #E2DED4;
    --accent: #4A148C; /* Regal Purple */
    --accent-soft: #F3EAF8;
    --font-serif: "Georgia", "Times New Roman", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    text-decoration: underline;
}

/* Layout Containers */
.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--text);
    letter-spacing: -0.01em;
}

.brand-mark {
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-weight: bold;
    font-size: 0.9rem;
    border-radius: 2px;
}

nav {
    display: flex;
    gap: 28px;
    font-size: 0.9rem;
    color: var(--muted);
}

nav a {
    color: var(--muted);
    font-weight: 500;
}

nav a:hover {
    color: var(--text);
    text-decoration: none;
}

/* Hero Section */
.hero {
    padding: 80px 0 60px;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.hero-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #10753f;
    background: #e9f7ef;
    padding: 4px 10px;
    border-radius: 2px;
    margin-bottom: 20px;
    border: 1px solid rgba(16, 117, 63, 0.2);
}

h1 {
    font-family: var(--font-serif);
    font-size: 2.75rem;
    line-height: 1.15;
    font-weight: normal;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.hero-lead {
    font-size: 1.125rem;
    color: var(--muted);
    margin-bottom: 32px;
    max-width: 540px;
}

.btn {
    display: inline-flex;
    align-items: center;
    background: var(--accent);
    color: var(--card-bg);
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 2px;
    transition: background 0.2s;
}

.btn:hover {
    background: #3B0E70; /* Darker purple for hover */
    color: #FFF;
    text-decoration: none;
}

/* Citation Preview Card */
.citation-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    border-radius: 2px;
}

.citation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 12px;
    margin-bottom: 16px;
    border-bottom: 1px dashed var(--border);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--muted);
}

.permalink-box {
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 8px 12px;
    font-family: var(--font-mono);
    font-size: 0.825rem;
    color: var(--accent);
    margin-bottom: 16px;
    word-break: break-all;
}

.citation-excerpt {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text);
    padding-left: 16px;
    border-left: 3px solid var(--accent);
    background: #FAF8F5;
    padding: 12px 16px;
    margin-bottom: 12px;
}

.citation-meta {
    font-size: 0.8rem;
    color: var(--muted);
    font-style: italic;
}

/* Section Headers */
.section-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: normal;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--muted);
    font-size: 1rem;
    margin-bottom: 40px;
}

hr.divider {
    border: none;
    border-top: 1px solid var(--border);
    margin: 64px 0;
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 28px;
    border-radius: 2px;
}

.card h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: normal;
    margin-bottom: 10px;
}

.card p {
    color: var(--muted);
    font-size: 0.925rem;
}

/* DOI Distinction Banner */
.comparison-banner {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    padding: 32px;
    margin: 40px 0;
}

.comparison-banner h3 {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.comparison-banner p {
    color: var(--muted);
}

/* Epistemology List */
.epistemology-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.epistemology-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 24px;
}

.epistemology-item strong {
    display: block;
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: var(--accent);
    margin-bottom: 8px;
    font-weight: normal;
}

.epistemology-item span {
    font-size: 0.9rem;
    color: var(--muted);
}

/* Legal Accordion / Details */
details {
    background: var(--card-bg);
    border: 1px solid var(--border);
    margin-bottom: 12px;
    border-radius: 2px;
}

summary {
    padding: 16px 20px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: "+";
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--muted);
}

details[open] summary::after {
    content: "−";
}

details[open] summary {
    border-bottom: 1px solid var(--border);
    background: #FAF8F5;
}

.details-content {
    padding: 20px;
    font-size: 0.9rem;
    color: var(--muted);
}

.details-content p {
    margin-bottom: 15px;
}
.details-content p:last-child {
    margin-bottom: 0;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 40px 0;
    margin-top: 80px;
    font-size: 0.85rem;
    color: var(--muted);
    background: var(--bg);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (max-width: 768px) {
    .hero {
    grid-template-columns: 1fr;
    padding: 40px 0;
    }

    .grid-2, .epistemology-list {
    grid-template-columns: 1fr;
    }

    nav {
    display: none;
    }
}