/*
Theme Name: Academic Publication Index
Theme URI: https://example.com/academic-publication-theme
Author: Custom Theme
Author URI: https://example.com
Description: A clean, scholarly theme for showcasing academic publications. Features custom post types for publications, taxonomy-based filtering, and a timeless academic design.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: academic-pub
Tags: portfolio, education, custom-colors, custom-menu, featured-images, threaded-comments, translation-ready
*/

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
    --color-navy: #1a2744;
    --color-navy-light: #2d3e5f;
    --color-navy-dark: #0f1829;
    --color-burgundy: #722f37;
    --color-burgundy-light: #8b3d47;
    --color-burgundy-dark: #5a252c;
    --color-cream: #faf8f5;
    --color-ivory: #f5f3f0;
    --color-warm-gray: #e8e4df;
    --color-warm-gray-dark: #d0cbc4;
    --color-text: #2c2c2c;
    --color-text-muted: #666666;
    --color-text-light: #888888;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-success: #2d5a3d;
    --color-focus: #4a90d9;
    --color-error: #c53030;
    --font-serif: 'Libre Baskerville', 'Georgia', 'Times New Roman', serif;
    --font-sans: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1.125rem;
    --text-lg: 1.25rem;
    --text-xl: 1.5rem;
    --text-2xl: 2rem;
    --text-3xl: 2.5rem;
    --text-4xl: 3rem;
    --leading-tight: 1.25;
    --leading-normal: 1.6;
    --leading-relaxed: 1.75;
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --shadow-sm: 0 1px 2px rgba(26, 39, 68, 0.08);
    --shadow-md: 0 4px 12px rgba(26, 39, 68, 0.1);
    --shadow-lg: 0 8px 24px rgba(26, 39, 68, 0.12);
    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 12px;
    --radius-full: 100px;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --container-max: 1200px;
    --container-narrow: 800px;
    --sidebar-width: 320px;
}

*, *::before, *::after { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-cream);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: var(--weight-normal);
    line-height: var(--leading-tight);
    margin-top: 0;
    margin-bottom: var(--space-4);
    color: var(--color-navy);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { margin-top: 0; margin-bottom: var(--space-4); }

a {
    color: var(--color-burgundy);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-burgundy-light); text-decoration: underline; }
a:focus { outline: 2px solid var(--color-focus); outline-offset: 2px; }

img { max-width: 100%; height: auto; display: block; }
ul, ol { margin-top: 0; margin-bottom: var(--space-4); padding-left: var(--space-6); }

/* Layout */
.container {
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}
.container--narrow { max-width: var(--container-narrow); }

.layout-two-col {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--space-8);
}
@media (max-width: 900px) {
    .layout-two-col { grid-template-columns: 1fr; }
}

.section { padding-top: var(--space-12); padding-bottom: var(--space-12); }

/* Header */
.site-header {
    background-color: var(--color-navy);
    color: var(--color-white);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}
.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.site-branding { display: flex; align-items: center; gap: var(--space-3); }
.site-title {
    font-family: var(--font-serif);
    font-size: var(--text-lg);
    font-weight: var(--weight-normal);
    margin: 0;
}
.site-title a { color: var(--color-white); text-decoration: none; }
.site-title a:hover { color: var(--color-warm-gray); }

.primary-navigation { display: flex; align-items: center; }
.primary-navigation ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-1);
}
.primary-navigation li { margin: 0; }
.primary-navigation a {
    display: block;
    padding: var(--space-2) var(--space-4);
    color: var(--color-white);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}
.primary-navigation a:hover,
.primary-navigation .current-menu-item a,
.primary-navigation .current_page_item a {
    background-color: var(--color-navy-light);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: var(--text-xl);
    cursor: pointer;
    padding: var(--space-2);
}
@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .primary-navigation {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-navy);
        padding: var(--space-4);
        box-shadow: var(--shadow-lg);
    }
    .primary-navigation.is-open { display: block; }
    .primary-navigation ul { flex-direction: column; gap: var(--space-2); }
    .primary-navigation a { padding: var(--space-3) var(--space-4); }
}

/* Footer */
.site-footer {
    background-color: var(--color-navy-dark);
    color: var(--color-warm-gray);
    padding: var(--space-8) 0;
    margin-top: var(--space-16);
}
.site-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}
.site-footer a { color: var(--color-warm-gray); }
.site-footer a:hover { color: var(--color-white); }
.footer-nav ul { display: flex; list-style: none; margin: 0; padding: 0; gap: var(--space-6); }
.footer-nav a { font-size: var(--text-sm); }
.copyright { font-size: var(--text-sm); margin: 0; }

/* Buttons */
.btn {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    text-decoration: none;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
    line-height: 1.4;
}
.btn:hover { text-decoration: none; }
.btn:focus { outline: 2px solid var(--color-focus); outline-offset: 2px; }
.btn--primary {
    background-color: var(--color-burgundy);
    color: var(--color-white);
    border-color: var(--color-burgundy);
}
.btn--primary:hover {
    background-color: var(--color-burgundy-light);
    border-color: var(--color-burgundy-light);
    color: var(--color-white);
}
.btn--secondary {
    background-color: transparent;
    color: var(--color-navy);
    border-color: var(--color-navy);
}
.btn--secondary:hover {
    background-color: var(--color-navy);
    color: var(--color-white);
}
.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }
.btn-group { display: flex; flex-wrap: wrap; gap: var(--space-3); }

/* Forms */
.form-group { margin-bottom: var(--space-4); }
.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-text);
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text);
    background-color: var(--color-white);
    border: 1px solid var(--color-warm-gray-dark);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-burgundy);
    box-shadow: 0 0 0 3px rgba(114, 47, 55, 0.1);
}
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}
.form-textarea { min-height: 120px; resize: vertical; }

/* Term Pills */
.term-pill {
    display: inline-block;
    background-color: var(--color-navy);
    color: var(--color-white);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: background-color var(--transition-fast);
    line-height: 1.4;
}
.term-pill:hover { background-color: var(--color-navy-light); color: var(--color-white); text-decoration: none; }
.term-pill--subject { background-color: var(--color-burgundy); }
.term-pill--subject:hover { background-color: var(--color-burgundy-light); }
.term-pill--decade { background-color: var(--color-text-muted); }
.term-pill--decade:hover { background-color: var(--color-text); }
.term-pills { display: flex; flex-wrap: wrap; gap: var(--space-2); }

/* Hero */
.hero {
    background-color: var(--color-ivory);
    padding: var(--space-16) 0;
    border-bottom: 1px solid var(--color-warm-gray);
}
.hero__inner {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-10);
    align-items: center;
}
@media (max-width: 768px) {
    .hero__inner { grid-template-columns: 1fr; text-align: center; }
}
.hero__portrait {
    width: 200px;
    height: 250px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}
@media (max-width: 768px) {
    .hero__portrait { margin: 0 auto; }
}
.hero__content { max-width: 600px; }
.hero__name { font-size: var(--text-3xl); margin-bottom: var(--space-2); }
.hero__title {
    font-size: var(--text-lg);
    color: var(--color-burgundy);
    margin-bottom: var(--space-2);
    font-family: var(--font-sans);
    font-weight: var(--weight-medium);
}
.hero__discipline {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    margin-bottom: var(--space-6);
    font-style: italic;
}
.hero__intro { font-size: var(--text-base); line-height: var(--leading-relaxed); margin-bottom: var(--space-8); }

/* Publication Cards */
.publication-cards { display: flex; flex-direction: column; gap: var(--space-4); }
.publication-card {
    background-color: var(--color-ivory);
    border: 1px solid var(--color-warm-gray);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}
.publication-card:hover { box-shadow: var(--shadow-md); border-color: var(--color-warm-gray-dark); }
.publication-card--featured { border-left: 4px solid var(--color-burgundy); }
.publication-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}
@media (max-width: 600px) {
    .publication-card__header { flex-direction: column; gap: var(--space-2); }
}
.publication-card__title {
    font-family: var(--font-serif);
    font-size: var(--text-lg);
    font-weight: var(--weight-normal);
    margin: 0;
    line-height: var(--leading-tight);
}
.publication-card__title a { color: var(--color-navy); }
.publication-card__title a:hover { color: var(--color-burgundy); }
.publication-card__meta {
    display: flex;
    gap: var(--space-3);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    flex-shrink: 0;
}
.publication-card__meta .meta-year { font-weight: var(--weight-semibold); color: var(--color-navy); }
.publication-card__meta .meta-type { color: var(--color-burgundy); }
.publication-card__citation {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
}
.publication-card__subjects { margin-bottom: var(--space-4); }
.publication-card__footer {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-warm-gray);
}
.publication-card__link { font-size: var(--text-sm); font-weight: var(--weight-medium); }
.publication-card__link--external::after { content: " ↗"; }
.publication-card__link--pdf::before { content: "📄 "; }

/* Publications Archive */
.publications-archive { padding: var(--space-12) 0; }
.archive-header { margin-bottom: var(--space-8); }
.archive-header h1 { margin-bottom: var(--space-2); }
.archive-header .archive-description { font-size: var(--text-lg); color: var(--color-text-muted); }

/* Filters */
.publication-filters {
    background-color: var(--color-ivory);
    border: 1px solid var(--color-warm-gray);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}
.filter-row { margin-bottom: var(--space-4); }
.filter-row:last-child { margin-bottom: 0; }
.filter-search { display: flex; gap: var(--space-3); }
.filter-search input { flex: 1; }
.filter-dropdowns { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: flex-end; }
.filter-group { flex: 1; min-width: 150px; }
.filter-group label { display: block; font-size: var(--text-sm); font-weight: var(--weight-semibold); margin-bottom: var(--space-2); }
.filter-group select { width: 100%; }
.filter-actions { display: flex; gap: var(--space-3); align-items: center; }
.reset-filters { font-size: var(--text-sm); color: var(--color-text-muted); }

.publications-list { margin-bottom: var(--space-12); }
.publications-list h2 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--color-warm-gray);
}
.no-results { text-align: center; padding: var(--space-12) var(--space-6); color: var(--color-text-muted); font-style: italic; }

/* Pagination */
.pagination { display: flex; justify-content: center; gap: var(--space-2); margin-top: var(--space-8); flex-wrap: wrap; }
.pagination a, .pagination span {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--color-warm-gray);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    text-decoration: none;
    transition: all var(--transition-fast);
}
.pagination a:hover { background-color: var(--color-navy); border-color: var(--color-navy); color: var(--color-white); }
.pagination .current { background-color: var(--color-burgundy); border-color: var(--color-burgundy); color: var(--color-white); }

/* Browse By */
.browse-by {
    background-color: var(--color-ivory);
    border: 1px solid var(--color-warm-gray);
    border-radius: var(--radius-md);
    padding: var(--space-6);
}
.browse-by h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-warm-gray);
}
.browse-by h3:not(:first-child) { margin-top: var(--space-6); }
.term-list { list-style: none; padding: 0; margin: 0; }
.term-list li { padding: var(--space-2) 0; border-bottom: 1px solid var(--color-warm-gray); }
.term-list li:last-child { border-bottom: none; }
.term-list .count { color: var(--color-text-muted); font-size: var(--text-sm); }
.term-list--inline { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.term-list--inline li { padding: 0; border: none; }

/* Single Publication */
.single-publication { padding: var(--space-12) 0; }
.publication-back-link { display: inline-block; margin-bottom: var(--space-6); font-size: var(--text-sm); color: var(--color-text-muted); }
.publication-back-link:hover { color: var(--color-burgundy); }
.publication-header { margin-bottom: var(--space-8); }
.publication-header h1 { font-size: var(--text-2xl); margin-bottom: var(--space-3); }
.publication-header__meta { display: flex; flex-wrap: wrap; gap: var(--space-4); font-size: var(--text-base); color: var(--color-text-muted); }
.publication-header__meta span { display: flex; align-items: center; gap: var(--space-2); }
.publication-main { display: grid; grid-template-columns: 1fr 300px; gap: var(--space-8); }
@media (max-width: 900px) { .publication-main { grid-template-columns: 1fr; } }
.publication-content { min-width: 0; }
.publication-citation {
    background-color: var(--color-ivory);
    border-left: 4px solid var(--color-burgundy);
    padding: var(--space-4) var(--space-6);
    margin-bottom: var(--space-6);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
}
.publication-meta-inline { display: flex; flex-wrap: wrap; gap: var(--space-6); margin-bottom: var(--space-6); font-size: var(--text-sm); color: var(--color-text-muted); }
.publication-meta-inline dt { font-weight: var(--weight-semibold); color: var(--color-text); }
.publication-meta-inline dd { margin: 0; }
.publication-abstract { margin-bottom: var(--space-8); }
.publication-abstract h2 { font-size: var(--text-lg); margin-bottom: var(--space-4); }
.publication-body { line-height: var(--leading-relaxed); }
.publication-sidebar { display: flex; flex-direction: column; gap: var(--space-6); }
.sidebar-section {
    background-color: var(--color-ivory);
    border: 1px solid var(--color-warm-gray);
    border-radius: var(--radius-md);
    padding: var(--space-5);
}
.sidebar-section h3 { font-size: var(--text-base); margin-bottom: var(--space-4); padding-bottom: var(--space-2); border-bottom: 1px solid var(--color-warm-gray); }
.access-buttons { display: flex; flex-direction: column; gap: var(--space-3); }
.access-buttons .btn { width: 100%; justify-content: center; }
.rights-note { font-size: var(--text-sm); color: var(--color-text-muted); font-style: italic; margin-top: var(--space-3); }
.related-publications { margin-top: var(--space-12); padding-top: var(--space-8); border-top: 2px solid var(--color-warm-gray); }
.related-publications h2 { font-size: var(--text-xl); margin-bottom: var(--space-6); }

/* Selected Works */
.selected-works { margin-bottom: var(--space-12); }
.selected-works h2 { font-size: var(--text-xl); margin-bottom: var(--space-6); display: flex; align-items: center; gap: var(--space-3); }
.selected-works h2::before { content: "★"; color: var(--color-burgundy); }
.selected-works .publication-cards { margin-bottom: var(--space-6); }
.selected-works .view-all-link { text-align: center; }

/* Biography */
.biography-page { padding: var(--space-12) 0; }
.biography-header { display: grid; grid-template-columns: 200px 1fr; gap: var(--space-8); margin-bottom: var(--space-10); align-items: start; }
@media (max-width: 768px) { .biography-header { grid-template-columns: 1fr; text-align: center; } .biography-header__portrait { margin: 0 auto; } }
.biography-header__portrait img { width: 200px; height: 250px; object-fit: cover; border-radius: var(--radius-md); box-shadow: var(--shadow-md); }
.biography-header h1 { margin-bottom: var(--space-3); }
.biography-section { margin-bottom: var(--space-10); }
.biography-section h2 { font-size: var(--text-xl); margin-bottom: var(--space-4); padding-bottom: var(--space-2); border-bottom: 2px solid var(--color-warm-gray); }
.biography-section p { max-width: 800px; }
.positions-timeline { list-style: none; padding: 0; margin: 0; }
.position-item { display: grid; grid-template-columns: 120px 1fr 1fr; gap: var(--space-4); padding: var(--space-4) 0; border-bottom: 1px solid var(--color-warm-gray); }
@media (max-width: 600px) { .position-item { grid-template-columns: 1fr; gap: var(--space-2); } }
.position-item:last-child { border-bottom: none; }
.position-dates { font-weight: var(--weight-semibold); color: var(--color-navy); font-size: var(--text-sm); }
.position-institution { color: var(--color-burgundy); }
.position-role { color: var(--color-text); }

/* CV Page */
.cv-page { padding: var(--space-12) 0; }
.cv-download {
    background-color: var(--color-ivory);
    border: 2px solid var(--color-burgundy);
    border-radius: var(--radius-md);
    padding: var(--space-8);
    text-align: center;
    margin-bottom: var(--space-10);
}
.cv-download h2 { margin-bottom: var(--space-4); }
.cv-download p { margin-bottom: var(--space-6); color: var(--color-text-muted); }
.cv-section { margin-bottom: var(--space-8); }
.cv-section h2 { font-size: var(--text-xl); margin-bottom: var(--space-4); padding-bottom: var(--space-2); border-bottom: 2px solid var(--color-warm-gray); }
.cv-list { list-style: none; padding: 0; }
.cv-list li { padding: var(--space-3) 0; border-bottom: 1px solid var(--color-warm-gray); }
.cv-list li:last-child { border-bottom: none; }

/* Contact Page */
.contact-page { padding: var(--space-12) 0; }
.contact-page .container--narrow { max-width: 600px; }
.contact-intro { margin-bottom: var(--space-8); }
.contact-form {
    background-color: var(--color-ivory);
    border: 1px solid var(--color-warm-gray);
    border-radius: var(--radius-md);
    padding: var(--space-8);
}

/* Page Templates */
.page-content { padding: var(--space-12) 0; }
.page-content h1 { margin-bottom: var(--space-8); }
.entry-content { max-width: 800px; }
.entry-content h2 { margin-top: var(--space-8); }
.entry-content h3 { margin-top: var(--space-6); }

/* Screen Reader */
.screen-reader-text {
    border: 0; clip: rect(1px, 1px, 1px, 1px); clip-path: inset(50%);
    height: 1px; margin: -1px; overflow: hidden; padding: 0;
    position: absolute; width: 1px; word-wrap: normal !important;
}
.screen-reader-text:focus {
    background-color: var(--color-ivory); clip: auto !important; clip-path: none;
    color: var(--color-navy); display: block; font-size: var(--text-sm);
    font-weight: var(--weight-semibold); height: auto; left: var(--space-2);
    line-height: normal; padding: var(--space-4); text-decoration: none;
    top: var(--space-2); width: auto; z-index: 100000;
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-small { font-size: var(--text-sm); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-8 { margin-bottom: var(--space-8); }