/* assets/css/style.css */
:root {
    --primary-color: #0d233a; /* Deep Navy Blue */
    --secondary-color: #f4f4f4; /* Light Gray */
    --accent-color: #bfa15f; /* Gold for academic accent */
    --text-color: #333333;
    --text-light: #666666;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --font-heading: 'Merriweather', serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --container-width: 1100px;
    --border-radius: 4px;
}

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

body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--secondary-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 700;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background-color: var(--white);
    border-bottom: 3px solid var(--accent-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.top-bar {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px 0;
    font-size: 0.9rem;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar a {
    color: var(--white);
    margin-left: 15px;
}

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

.header-main {
    padding: 30px 0;
    text-align: center;
}

.site-title {
    font-size: 2.2rem;
    margin-bottom: 5px;
}

.site-title a {
    color: var(--primary-color);
}

.site-subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
    font-style: italic;
    font-family: var(--font-heading);
}

nav.main-nav {
    background-color: var(--white);
    border-top: 1px solid var(--border-color);
}

nav.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav.main-nav li {
    margin: 0 15px;
}

nav.main-nav a {
    display: block;
    padding: 15px 5px;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    font-size: 0.95rem;
    position: relative;
}

nav.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

nav.main-nav a:hover::after,
nav.main-nav a.active::after {
    width: 100%;
}

/* Main Content */
main {
    flex: 1;
    padding: 60px 0;
}

.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 2.5rem;
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}

.page-header h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
}

.content-box {
    background-color: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.content-box p {
    margin-bottom: 15px;
    font-size: 1.05rem;
}

/* Issue Display */
.issue-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.issue-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.issue-title {
    font-size: 1.8rem;
    margin: 0;
}

.issue-meta {
    font-size: 1rem;
    color: var(--primary-color);
    font-weight: 600;
    background-color: rgba(191, 161, 95, 0.1);
    padding: 5px 15px;
    border-radius: 20px;
}

/* Paper Table/List */
.paper-list {
    list-style: none;
}

.paper-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.paper-item:last-child {
    border-bottom: none;
}

.paper-info {
    flex: 1;
    padding-right: 20px;
}

.paper-title {
    font-size: 1.25rem;
    margin-bottom: 5px;
}

.paper-title a {
    color: var(--primary-color);
}

.paper-authors {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.paper-actions a {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 500;
}

.paper-actions a:hover {
    background-color: var(--accent-color);
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 50px 0 20px;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3 {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.footer-col p {
    color: #cccccc;
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    color: #cccccc;
}

.footer-col ul a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    color: #999999;
    font-size: 0.9rem;
}

/* Utility */
.btn-primary {
    display: inline-block;
    padding: 10px 24px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: background-color 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--accent-color);
    color: var(--white);
}

.text-center { text-align: center; }
.mt-2 { margin-top: 20px; }
.mb-2 { margin-bottom: 20px; }

/* Responsive */
@media (max-width: 768px) {
    .site-title { font-size: 1.8rem; }
    .paper-item { flex-direction: column; }
    .paper-actions { margin-top: 15px; }
    .issue-header { flex-direction: column; align-items: flex-start; }
    .issue-meta { margin-top: 10px; }
}