/* Scientific Report Typography Style */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,600;1,400&family=Open+Sans:wght@400;600&display=swap');

:root {
    --paper-bg: #fdfdfc;
    --paper-text: #1a1a1a;
    --paper-muted: #555555;
    --paper-link: #0056b3;
    --paper-border: #000000;
    --font-serif: 'Lora', 'Times New Roman', serif;
    --font-sans: 'Open Sans', Arial, sans-serif;
}

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

body {
    background-color: #e9e9e9; /* Desk background */
    color: var(--paper-text);
    font-family: var(--font-serif);
    line-height: 1.7;
    padding: 40px 20px;
    display: flex;
    justify-content: center;
}

/* The Paper Document */
.paper-document {
    background-color: var(--paper-bg);
    max-width: 900px;
    width: 100%;
    padding: 60px 80px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
}
.paper-document::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 5px;
    background: var(--paper-border);
}

h1, h2, h3, h4 { font-family: var(--font-serif); font-weight: 600; color: var(--paper-text); }
h1 { font-size: 2.5rem; text-align: center; margin-bottom: 20px; line-height: 1.2; }
h2 { font-size: 1.5rem; margin-top: 40px; margin-bottom: 15px; border-bottom: 1px solid #ddd; padding-bottom: 5px; }
h3 { font-size: 1.2rem; margin-top: 20px; margin-bottom: 10px; }
a { color: var(--paper-link); text-decoration: none; }
a:hover { text-decoration: underline; }
p { margin-bottom: 15px; text-align: justify; }

/* Journal Header */
.journal-header {
    text-align: center;
    border-bottom: 2px solid var(--paper-border);
    padding-bottom: 20px;
    margin-bottom: 30px;
}
.journal-meta {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--paper-muted);
    display: flex;
    justify-content: space-between;
    text-transform: uppercase;
    margin-bottom: 20px;
}
.authors { font-style: italic; color: var(--paper-muted); margin-bottom: 20px; }

/* Navigation as Table of Contents */
.paper-nav {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}
.paper-nav a { color: var(--paper-text); font-weight: 600; }
.paper-nav a.active { border-bottom: 2px solid var(--paper-text); }
.nav-actions { margin-top: 10px; text-align: center; }
.btn-primary {
    display: inline-block;
    background: var(--paper-text);
    color: var(--paper-bg);
    font-family: var(--font-sans);
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--paper-text);
    transition: 0.2s;
}
.btn-primary:hover { background: var(--paper-bg); color: var(--paper-text); text-decoration: none; }
.btn-secondary {
    display: inline-block;
    background: transparent;
    color: var(--paper-text);
    font-family: var(--font-sans);
    padding: 8px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--paper-text);
    transition: 0.2s;
}
.btn-secondary:hover { background: #f0f0f0; text-decoration: none; }

/* Abstract & Keywords */
.abstract-section {
    margin-bottom: 40px;
}
.abstract-title { text-align: center; font-size: 1.1rem; text-transform: uppercase; margin-bottom: 10px; }
.abstract-text { font-weight: 600; font-size: 0.95rem; margin-bottom: 15px; }
.keywords { font-family: var(--font-sans); font-size: 0.85rem; }
.keywords strong { font-family: var(--font-serif); }

.trust-highlights {
    background: #f9f9f9;
    padding: 15px;
    border-left: 3px solid var(--paper-border);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    margin-bottom: 30px;
}
.trust-highlights ul { list-style: none; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.trust-highlights li::before { content: '✓ '; font-weight: bold; }

/* Two Column Layout for Main Content */
.two-column {
    column-count: 2;
    column-gap: 40px;
    text-align: justify;
}
.two-column > * { break-inside: avoid; }

/* Figures and Images */
.figure {
    margin: 20px 0;
    text-align: center;
}
.figure img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ccc;
    display: block;
    margin: 0 auto 10px;
    filter: grayscale(80%); /* Academic feel */
}
.figure img:hover { filter: grayscale(0%); }
.figcaption {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--paper-muted);
}

/* Academic Tables */
.academic-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-family: var(--font-sans);
    font-size: 0.9rem;
}
.academic-table th, .academic-table td {
    padding: 10px;
    text-align: left;
}
.academic-table th {
    border-top: 2px solid var(--paper-border);
    border-bottom: 1px solid var(--paper-border);
    font-weight: 600;
}
.academic-table tr:last-child td {
    border-bottom: 2px solid var(--paper-border);
}
.table-caption {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--paper-muted);
    text-align: left;
    margin-bottom: 5px;
    font-weight: 600;
}

/* Peer Reviews (Blockquotes) */
.peer-review {
    margin: 20px 0;
    padding: 15px 20px;
    border-left: 4px solid #ddd;
    background: #fafafa;
    font-style: italic;
}
.review-author {
    display: block;
    margin-top: 10px;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-style: normal;
    font-weight: 600;
}

/* Pricing Grid */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 30px 0;
}
.price-tier {
    border: 1px solid #ddd;
    padding: 20px;
    text-align: center;
    font-family: var(--font-sans);
}
.price-tier.recommended {
    border: 2px solid var(--paper-border);
    position: relative;
}
.price-tier.recommended::before {
    content: 'Recommended';
    position: absolute;
    top: -10px; left: 50%; transform: translateX(-50%);
    background: var(--paper-bg);
    padding: 0 10px;
    font-size: 0.75rem;
    font-weight: 600;
}
.tier-name { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; }
.tier-price { font-size: 2rem; font-weight: 600; margin-bottom: 20px; font-family: var(--font-serif); }
.tier-price span { font-size: 0.9rem; font-weight: 400; }
.tier-features { list-style: none; text-align: left; margin-bottom: 20px; font-size: 0.85rem; }
.tier-features li { padding: 5px 0; border-bottom: 1px dotted #eee; }

/* FAQ */
.faq-list { margin-top: 20px; }
.faq-item { margin-bottom: 20px; }
.faq-q { font-weight: 600; margin-bottom: 5px; }
.faq-a { color: var(--paper-muted); }

/* References / Footer */
.references {
    margin-top: 60px;
    border-top: 1px solid #ddd;
    padding-top: 20px;
    font-family: var(--font-sans);
    font-size: 0.85rem;
}
.ref-title { font-family: var(--font-serif); font-size: 1.1rem; margin-bottom: 15px; }
.ref-list { list-style: decimal; padding-left: 20px; color: var(--paper-muted); margin-bottom: 30px; }
.ref-list li { margin-bottom: 5px; }
.footer-meta {
    text-align: center;
    border-top: 2px solid var(--paper-border);
    padding-top: 20px;
    color: var(--paper-muted);
}

/* Subpages */
.subpage-header { text-align: center; margin-bottom: 40px; }
.dl-list { display: flex; flex-direction: column; gap: 20px; }
.dl-item { border: 1px solid #ddd; padding: 20px; display: flex; justify-content: space-between; align-items: center; }
.dl-info h3 { margin: 0 0 5px 0; }
.dl-info p { margin: 0; font-family: var(--font-sans); font-size: 0.9rem; color: var(--paper-muted); }

/* Responsive */
@media (max-width: 768px) {
    body { padding: 10px; }
    .paper-document { padding: 30px 20px; }
    .two-column { column-count: 1; }
    h1 { font-size: 2rem; }
    .pricing-grid { grid-template-columns: 1fr; }
    .dl-item { flex-direction: column; text-align: center; gap: 15px; }
    .trust-highlights ul { flex-direction: column; align-items: center; gap: 10px; }
}