/*
 * MLSys Proceedings - Clean Professional Theme
 */

/* ============================================
   COLOR PALETTE
   ============================================ */
:root {
    --mlsys-bg: #e8e8e8;  /* temporary: obviously gray to test */
    --mlsys-bg-subtle: #e0e0e0;
    --mlsys-border: #e5e7eb;
    --mlsys-border-light: #f3f4f6;
    --mlsys-text: #374151;
    --mlsys-text-muted: #6b7280;
    --mlsys-text-light: #9ca3af;
    --mlsys-link: #2563eb;
    --mlsys-link-hover: #1d4ed8;
    --mlsys-accent: #3b82f6;
}

/* ============================================
   BASE - Force light background
   ============================================ */
body.mlsys {
    background-color: var(--mlsys-bg) !important;
    color: var(--mlsys-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    font-size: 15px;
}

body.mlsys .container-fluid {
    max-width: 1100px;
    padding: 0 2.5rem;
    background-color: transparent !important;
}

body.mlsys .container-fluid > .col,
body.mlsys .container-fluid > .col-sm,
body.mlsys .container-fluid > div[class^="col"] {
    background-color: transparent !important;
}

body.mlsys a {
    color: var(--mlsys-link);
    text-decoration: none;
}

body.mlsys a:hover {
    color: var(--mlsys-link-hover);
    text-decoration: underline;
}

/* ============================================
   NAVBAR
   ============================================ */
body.mlsys .navbar {
    background-color: var(--mlsys-bg-subtle) !important;
    border-bottom: 1px solid var(--mlsys-border);
    border-left: 3px solid var(--mlsys-accent);
    padding: 0.875rem 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

body.mlsys .navbar-brand {
    color: var(--mlsys-text) !important;
    font-weight: 600;
    font-size: 1.0625rem;
    letter-spacing: -0.01em;
}

body.mlsys .navbar-brand:hover {
    color: var(--mlsys-accent) !important;
    text-decoration: none;
}

body.mlsys .nav-link {
    color: var(--mlsys-text-muted) !important;
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem !important;
    border-radius: 4px;
    transition: background-color 0.15s ease, color 0.15s ease;
}

body.mlsys .nav-link:hover {
    color: var(--mlsys-text) !important;
    background-color: rgba(0, 0, 0, 0.04);
}

body.mlsys .dropdown-menu {
    background-color: var(--mlsys-bg);
    border: 1px solid var(--mlsys-border);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 0.5rem;
}

body.mlsys .dropdown-item {
    color: var(--mlsys-text);
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
}

body.mlsys .dropdown-item:hover {
    background-color: var(--mlsys-bg-subtle);
    color: var(--mlsys-text);
}

body.mlsys .navbar .form-control {
    background-color: var(--mlsys-bg);
    border: 1px solid var(--mlsys-border);
    border-radius: 20px;
    font-size: 0.8125rem;
    color: var(--mlsys-text);
    padding: 0.4rem 0.875rem;
}

body.mlsys .navbar .form-control::placeholder {
    color: var(--mlsys-text-light);
}

body.mlsys .navbar .form-control:focus {
    background-color: var(--mlsys-bg);
    border-color: var(--mlsys-accent);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
    color: var(--mlsys-text);
}

body.mlsys .navbar .btn-outline-success {
    background-color: var(--mlsys-bg);
    border: 1px solid var(--mlsys-border);
    color: var(--mlsys-text-muted);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
}

body.mlsys .navbar .btn-outline-success:hover {
    background-color: var(--mlsys-accent);
    border-color: var(--mlsys-accent);
    color: #ffffff;
}

body.mlsys .navbar-toggler {
    border-color: var(--mlsys-border);
}

body.mlsys .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%2855, 65, 81, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ============================================
   HOME PAGE - Proceedings List
   ============================================ */
body.mlsys .proceedings-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0;
}

body.mlsys .proceedings-list li {
    padding: 0.875rem 0;
    padding-left: 0.75rem;
    border-bottom: 1px solid var(--mlsys-border);
    border-left: 2px solid transparent;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

body.mlsys .proceedings-list li:hover {
    border-left-color: var(--mlsys-accent);
    background-color: var(--mlsys-bg-subtle);
}

body.mlsys .proceedings-list li:first-child {
    border-top: 1px solid var(--mlsys-border);
}

body.mlsys .proceedings-list a {
    color: var(--mlsys-text);
    font-weight: 500;
}

body.mlsys .proceedings-list a:hover {
    color: var(--mlsys-link);
    text-decoration: none;
}

body.mlsys .proceedings-list .admin {
    color: var(--mlsys-text-light);
    font-size: 0.8125rem;
    margin-left: 0.5rem;
}

/* ============================================
   BOOK PAGE (Year)
   ============================================ */
body.mlsys .book-page {
    padding: 2rem 0 3rem 0;
}

body.mlsys .book-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--mlsys-border);
    border-left: 3px solid var(--mlsys-accent);
    padding-left: 1rem;
}

body.mlsys .book-title {
    font-size: 1.625rem;
    font-weight: 600;
    color: var(--mlsys-text);
    margin-bottom: 0.375rem;
    line-height: 1.3;
}

body.mlsys .book-meta {
    color: var(--mlsys-text-muted);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

body.mlsys .book-editors {
    color: var(--mlsys-text-muted);
    font-size: 0.9375rem;
    margin-bottom: 0.25rem;
}

body.mlsys .book-isbn {
    color: var(--mlsys-text-light);
    font-size: 0.8125rem;
    font-family: ui-monospace, monospace;
}

body.mlsys .paper-list-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

body.mlsys .paper-count {
    color: var(--mlsys-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

body.mlsys span.suffix_legend {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--mlsys-bg-subtle);
    border: 1px solid var(--mlsys-border-light);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--mlsys-text-muted);
}

/* ============================================
   PAPER LIST
   ============================================ */
body.mlsys ul.paper-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

body.mlsys ul.paper-list li {
    padding: 1.125rem 0;
    padding-left: 0.75rem;
    border-bottom: 1px solid var(--mlsys-border-light);
    border-left: 2px solid transparent;
    transition: border-color 0.15s ease;
}

body.mlsys ul.paper-list li:hover {
    border-left-color: var(--mlsys-accent);
    background-color: var(--mlsys-bg-subtle);
}

body.mlsys ul.paper-list li:last-child {
    border-bottom: none;
}

body.mlsys ul.paper-list li::before {
    display: none;
}

body.mlsys ul.paper-list li a[title="paper title"] {
    display: block;
    color: var(--mlsys-text);
    font-weight: 500;
    font-size: 0.9375rem;
    line-height: 1.5;
    text-decoration: none;
    margin-bottom: 0.25rem;
}

body.mlsys ul.paper-list li a[title="paper title"]:hover {
    color: var(--mlsys-link);
}

body.mlsys ul.paper-list li .paper-authors,
body.mlsys ul.paper-list li i {
    display: block;
    color: var(--mlsys-text-muted);
    font-style: normal;
    font-size: 0.8125rem;
    line-height: 1.5;
}

/* ============================================
   PAPER DETAIL PAGE
   ============================================ */
body.mlsys .paper-detail {
    padding: 2rem 0 3rem 0 !important;
}

body.mlsys .paper-header {
    margin-bottom: 1.5rem;
    border-left: 3px solid var(--mlsys-accent);
    padding-left: 1rem;
}

body.mlsys .paper-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--mlsys-text);
    line-height: 1.35;
    margin-bottom: 0.875rem;
}

body.mlsys .paper-header .paper-authors {
    color: var(--mlsys-text);
    font-size: 1.0625rem;
    margin-bottom: 0.875rem;
    line-height: 1.5;
}

body.mlsys .paper-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 0;
}

body.mlsys .paper-meta a {
    color: var(--mlsys-text-muted);
    font-size: 0.875rem;
}

body.mlsys .paper-meta a:hover {
    color: var(--mlsys-link);
}

body.mlsys .paper-track {
    display: inline-block;
    padding: 0.1875rem 0.5rem;
    background-color: var(--mlsys-bg-subtle);
    border: 1px solid var(--mlsys-border-light);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--mlsys-text-muted);
}

body.mlsys .paper-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 1.25rem 0;
    border-top: 1px solid var(--mlsys-border);
    border-bottom: 1px solid var(--mlsys-border);
    margin-bottom: 2rem;
}

body.mlsys .paper-notice {
    color: var(--mlsys-text-muted);
    font-size: 0.875rem;
    font-style: italic;
    margin-bottom: 1.5rem;
}

body.mlsys .paper-section {
    margin-bottom: 2rem;
}

body.mlsys .section-label {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--mlsys-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.625rem;
}

body.mlsys .paper-abstract {
    color: var(--mlsys-text);
    font-size: 1rem;
    line-height: 1.8;
}

body.mlsys .paper-doi-section {
    padding-top: 1.5rem;
    border-top: 1px solid var(--mlsys-border-light);
}

body.mlsys .paper-doi {
    font-family: ui-monospace, SFMono-Regular, monospace;
    font-size: 0.875rem;
    color: var(--mlsys-text-muted);
    background-color: var(--mlsys-bg-subtle);
    border: 1px solid var(--mlsys-border-light);
    padding: 0.25rem 0.625rem;
    border-radius: 4px;
}

body.mlsys .paper-doi:hover {
    color: var(--mlsys-link);
    text-decoration: none;
}

/* Legacy selectors */
body.mlsys .paper-detail > h4:first-of-type {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--mlsys-text);
    line-height: 1.35;
    margin-bottom: 0.875rem;
}

body.mlsys .paper-detail h4 {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--mlsys-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

body.mlsys .paper-detail p i {
    font-style: normal;
}

/* ============================================
   BUTTONS
   ============================================ */
body.mlsys .btn {
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.5rem 0.875rem;
    border-radius: 6px;
}

body.mlsys .btn-primary {
    background-color: var(--mlsys-link);
    border-color: var(--mlsys-link);
    color: #ffffff;
}

body.mlsys .btn-primary:hover {
    background-color: var(--mlsys-link-hover);
    border-color: var(--mlsys-link-hover);
    color: #ffffff;
}

body.mlsys .btn-success {
    background-color: var(--mlsys-text);
    border-color: var(--mlsys-text);
    color: #ffffff;
}

body.mlsys .btn-success:hover {
    background-color: var(--mlsys-text-muted);
    border-color: var(--mlsys-text-muted);
    color: #ffffff;
}

body.mlsys .btn-light,
body.mlsys .btn-secondary,
body.mlsys .btn-outline-secondary {
    background-color: var(--mlsys-bg);
    border: 1px solid var(--mlsys-border);
    color: var(--mlsys-text);
}

body.mlsys .btn-light:hover,
body.mlsys .btn-secondary:hover,
body.mlsys .btn-outline-secondary:hover {
    background-color: var(--mlsys-bg-subtle);
    border-color: var(--mlsys-border);
    color: var(--mlsys-text);
}

/* ============================================
   SEARCH RESULTS
   ============================================ */
body.mlsys .search-results {
    padding-top: 2rem !important;
}

body.mlsys .search-results h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--mlsys-text);
    margin-bottom: 1rem;
}

/* ============================================
   FOOTER
   ============================================ */
body.mlsys .footer {
    background-color: var(--mlsys-bg-subtle) !important;
    color: var(--mlsys-text-muted);
    border-top: 1px solid var(--mlsys-border);
    border-left: 3px solid var(--mlsys-accent);
    font-size: 0.8125rem;
}

body.mlsys .footer a {
    color: var(--mlsys-text-muted);
}

body.mlsys .footer a:hover {
    color: var(--mlsys-text);
    text-decoration: underline;
}

/* ============================================
   UTILITIES
   ============================================ */
body.mlsys hr {
    border: none;
    border-top: 1px solid var(--mlsys-border);
}

body.mlsys .card {
    background-color: var(--mlsys-bg);
    border: 1px solid var(--mlsys-border);
    border-radius: 8px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    body.mlsys .container-fluid {
        padding: 0 1.25rem;
    }

    body.mlsys .paper-title {
        font-size: 1.5rem;
    }

    body.mlsys .book-title {
        font-size: 1.375rem;
    }
}

/* Dark mode disabled - always use light theme */