/* ============================================================
   Shared stylesheet — Ranking Scholars in Economics
   Purple academic theme with rounded cards and clean hierarchy.
   ============================================================ */

:root {
    --primary: #502D7F;
    --primary-dark: #3E2261;
    --primary-light: #8A2BE2;
    --lavender: #E6E6FA;
    --lavender-soft: #F3EEFB;
    --lavender-pale: #F8F5FD;
    --thistle: #D8BFD8;
    --ink: #1F1B2E;
    --text: #2D2940;
    --muted: #6B6580;
    --line: #E4DDF0;
    --card-bg: #FFFFFF;
    --page-bg: #F7F4FC;
    --shadow-sm: 0 1px 3px rgba(46, 23, 89, 0.06);
    --shadow-md: 0 4px 18px rgba(46, 23, 89, 0.08);
    --shadow-lg: 0 12px 32px rgba(46, 23, 89, 0.12);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;
}

* { box-sizing: border-box; }

/* Stop iOS Safari from auto-inflating long text blocks (e.g. the rule
   explanations in the Method table), which made them look oversized on iPhone
   while short labels stayed normal. Has no effect on desktop. */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--page-bg);
    color: var(--text);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a { color: var(--primary); }
a:hover { color: var(--primary-dark); }

/* ---------- Top bar / navigation ---------- */
.site-header {
    background: linear-gradient(135deg, #502D7F 0%, #6E3FAE 100%);
    color: #fff;
    padding: 14px 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 50;
}
.site-header .nav-wrap {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.site-header .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #fff;
}
.site-header .brand-mark {
    height: 38px;
    padding: 0 14px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.18);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.05em;
    letter-spacing: 0.5px;
    backdrop-filter: blur(4px);
}
.site-header .brand-title {
    font-size: 1.15em;
    font-weight: 600;
    letter-spacing: 0.2px;
}
.site-nav {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}
.site-nav a {
    color: #fff;
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 0.95em;
    font-weight: 500;
    transition: background-color 0.2s ease, transform 0.2s ease;
    opacity: 0.9;
}
.site-nav a:hover {
    background-color: rgba(255, 255, 255, 0.16);
    opacity: 1;
}
.site-nav a.active {
    background-color: rgba(255, 255, 255, 0.22);
    opacity: 1;
}

/* ---------- Page layout ---------- */
.page {
    flex: 1;
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 36px 28px 64px;
}
.page-narrow {
    max-width: 960px;
}

/* ---------- Section + card primitives ---------- */
.section {
    margin-bottom: 36px;
}
.section-eyebrow {
    display: inline-block;
    color: var(--primary);
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 1.4px;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.section-title {
    font-size: 1.6em;
    color: var(--ink);
    margin: 0 0 8px;
    letter-spacing: -0.01em;
}
.section-lead {
    color: var(--muted);
    margin: 0 0 22px;
    max-width: 70ch;
}
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 28px;
    border: 1px solid var(--line);
}
.card + .card { margin-top: 24px; }

/* ---------- Hero (paper) ---------- */
.hero {
    position: relative;
    background:
        radial-gradient(circle at 0% 0%, rgba(138, 43, 226, 0.18), transparent 55%),
        radial-gradient(circle at 100% 100%, rgba(80, 45, 127, 0.22), transparent 55%),
        linear-gradient(135deg, #F8F5FD 0%, #EFE6FA 100%);
    border-radius: var(--radius-lg);
    padding: 48px 44px;
    border: 1px solid var(--line);
    overflow: hidden;
}
.hero .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(80, 45, 127, 0.10);
    color: var(--primary);
    border-radius: 999px;
    font-size: 0.78em;
    font-weight: 700;
    letter-spacing: 1.4px;
    text-transform: uppercase;
    margin-bottom: 16px;
}
.hero h1 {
    font-size: clamp(1.2em, 2.6vw, 2.15em);
    line-height: 1.18;
    color: var(--ink);
    margin: 0 0 18px;
    letter-spacing: -0.015em;
    white-space: nowrap;
}
.hero .authors {
    margin: 0 0 18px;
    display: grid;
    gap: 12px;
}
.hero .author {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.hero .author-name {
    font-weight: 600;
    color: var(--ink);
    font-size: 1.05em;
}
.hero .author-aff {
    color: var(--muted);
    font-size: 0.92em;
}
.hero .author-email {
    color: var(--primary);
    font-size: 0.92em;
    text-decoration: none;
}
.hero .author-email:hover { text-decoration: underline; }
.hero .author-site {
    color: var(--primary);
    font-size: 0.92em;
    text-decoration: none;
    word-break: break-all;
}
.hero .author-site:hover { text-decoration: underline; }

.hero .abstract {
    background: rgba(255, 255, 255, 0.7);
    border-left: 4px solid var(--primary);
    padding: 18px 22px;
    border-radius: 10px;
    margin-top: 22px;
    box-shadow: var(--shadow-sm);
}
.hero .abstract h3 {
    margin: 0 0 8px;
    font-size: 0.85em;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--primary);
}
.hero .abstract p {
    margin: 0;
    color: var(--text);
    font-size: 0.98em;
    line-height: 1.65;
}

.hero .button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    font-size: 0.92em;
    font-weight: 500;
    border: 1px solid transparent;
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
}
.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: #fff;
}
.btn.btn-ghost {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}
.btn.btn-ghost:hover {
    background: rgba(80, 45, 127, 0.08);
    color: var(--primary-dark);
}

/* ---------- Tile grid (homepage nav) ---------- */
.tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}
.tile {
    display: block;
    padding: 22px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    text-decoration: none;
    color: var(--text);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    box-shadow: var(--shadow-sm);
}
.tile:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--thistle);
    color: var(--text);
}
.tile-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--lavender);
    color: var(--primary);
    display: grid;
    place-items: center;
    font-weight: 700;
    margin-bottom: 12px;
}
.tile-title {
    font-size: 1.08em;
    font-weight: 600;
    color: var(--ink);
    margin: 0 0 4px;
}
.tile-sub {
    font-size: 0.9em;
    color: var(--muted);
    margin: 0;
}

/* ---------- Tables ---------- */
.table-wrap {
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--line);
    background: #fff;
}
table.std {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95em;
}
table.std th,
table.std td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--line);
}
table.std thead th {
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    letter-spacing: 0.2px;
    border-bottom: none;
}
table.std tbody tr:nth-child(even) { background: var(--lavender-pale); }
table.std tbody tr:hover { background: var(--lavender-soft); }

/* ---------- Method list (definitions) ---------- */
.method-table th:first-child,
.method-table td:first-child {
    width: 22%;
    font-weight: 600;
    color: var(--primary-dark);
    white-space: nowrap;
}
.method-table thead th:first-child { color: #fff; }
.method-table .formula {
    font-family: 'Cambria Math', 'Latin Modern Math', Georgia, serif;
    font-size: 1.02em;
    color: var(--ink);
}

/* ---------- Journal list ---------- */
.journal-block {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.journal-card {
    background: var(--lavender-pale);
    border: 1px solid var(--line);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 22px 24px;
}
.journal-card h3 {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 1.08em;
    letter-spacing: 0.2px;
}
.journal-card p {
    margin: 0;
    color: var(--text);
    font-size: 0.95em;
    line-height: 1.6;
}

/* ---------- Footer ---------- */
.site-footer {
    background: linear-gradient(135deg, #3E2261 0%, #502D7F 100%);
    color: rgba(255, 255, 255, 0.92);
    text-align: center;
    padding: 32px 24px;
    font-size: 0.92em;
    margin-top: 40px;
}
.site-footer a { color: #E6E6FA; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer .footer-inner {
    max-width: 1240px;
    margin: 0 auto;
}

/* ---------- Responsive ---------- */
/* Prevent any media (images/tables) from forcing horizontal page scroll on small screens. */
img { max-width: 100%; height: auto; }

@media (max-width: 768px) {
    .hero { padding: 32px 22px; }
    .hero h1 { white-space: normal; }
    .page { padding: 24px 18px 48px; }
    .card { padding: 22px; }
    .site-header .nav-wrap { padding: 0 18px; gap: 12px 16px; }
    .site-header .brand-title { font-size: 1em; }
    .site-nav { gap: 4px; }
    .site-nav a { padding: 7px 12px; font-size: 0.9em; }
    table.std { font-size: 0.88em; }
    table.std th, table.std td { padding: 10px 10px; }
    .site-footer { padding: 26px 18px; }
}

@media (max-width: 560px) {
    .hero { padding: 24px 16px; }
    .hero .brand-mark { font-size: 0.95em; }
    .section-title { font-size: 1.35em; }
    .section-eyebrow { font-size: 0.72em; }
    .page { padding: 20px 14px 40px; }
    .card { padding: 18px 16px; }
    .site-header .brand-mark { font-size: 0.92em; padding: 0 10px; }
    .site-nav a { padding: 6px 10px; font-size: 0.86em; }
}