/* css/paper.css - Refined styles for research papers */
/* Incorporates fixes for Share dropdown and Works Cited */
/* Assumes cms-base.css is loaded first */

/* --- Base Variables (Ensure consistency with cms-base.css) --- */
/* Inherited from cms-base.css */

/* Apply theme variables to body */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    font-family: var(--font-body); /* Default to serif for papers */
}

/* --- Paper Container --- */
.paper-container {
    max-width: 900px;
    margin: 0 auto;
    padding: calc(var(--cms-spacing-unit) * 2) var(--cms-spacing-unit);
    position: relative;
}

/* --- Back Navigation & Share --- */
.blog-nav {
    background-color: var(--bg-color);
    padding: var(--cms-spacing-unit) 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.blog-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--cms-spacing-unit);
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    transition: var(--cms-transition);
    font-family: var(--cms-font-sans);
}

.nav-back:hover {
    color: var(--secondary-color);
    opacity: 0.8;
}

/* --- Recommendation: Fix Share Button/Dropdown Styling --- */
.nav-share {
    position: relative; /* Needed for absolute positioning of dropdown */
}

.share-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    transition: var(--cms-transition);
    font-family: var(--cms-font-sans);
    font-size: 0.9rem; /* Ensure consistent size */
}

.share-button i {
    font-size: 0.9em; /* Adjust icon size relative to button text */
}

.share-button:hover {
    background-color: var(--section-bg-color); /* Use theme variable */
    border-color: var(--primary-color);
}

.share-dropdown {
    position: absolute;
    top: calc(100% + 8px); /* Position below the button with a gap */
    right: 0;
    background-color: var(--bg-color); /* Use theme background */
    box-shadow: var(--shadow-medium); /* Use theme shadow */
    border-radius: var(--cms-radius);
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    width: max-content; /* Adjust width based on content */
    min-width: 160px; /* Minimum width */
    display: none; /* Hidden by default */
    flex-direction: column;
    gap: 0.25rem;
    z-index: 1010; /* Ensure it's above other elements */
}

.share-dropdown.active {
    display: flex; /* Show when active class is added by JS */
}

.share-link {
    padding: 0.6rem 1rem; /* Adjust padding for better click area */
    text-decoration: none;
    color: var(--text-color); /* Use theme text color */
    border-radius: calc(var(--cms-radius) / 2);
    transition: var(--cms-transition);
    font-size: 0.9rem;
    font-family: var(--cms-font-sans);
    display: flex; /* Align icon and text if icons are added */
    align-items: center;
    gap: 0.5rem;
}

.share-link:hover {
    background-color: var(--section-bg-color); /* Use theme variable */
    color: var(--primary-color);
}
/* --- End Share Button Fix --- */


/* --- Paper Header --- */
.paper-header {
    margin-bottom: calc(var(--cms-spacing-unit) * 3);
    text-align: center;
    position: relative;
    padding-bottom: calc(var(--cms-spacing-unit) * 2);
    border-bottom: 1px solid var(--border-color);
}

.paper-title {
    font-family: var(--cms-font-heading);
    font-size: 2.6rem;
    color: var(--primary-color);
    margin-bottom: var(--cms-spacing-unit);
    line-height: 1.2;
    font-weight: 700;
}

.paper-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    color: var(--light-text-color);
    opacity: 0.9;
    font-size: 0.9rem;
    font-family: var(--cms-font-sans);
    margin-bottom: calc(var(--cms-spacing-unit) * 1.5);
}

.paper-meta span { display: inline-flex; align-items: center; gap: 0.4rem; }
.paper-meta span:not(:first-child)::before { content: '|'; color: var(--border-color); margin-right: 1.5rem; display: inline-block; }

/* --- Paper Abstract --- */
.paper-abstract {
    background: var(--section-bg-color);
    padding: 1.5rem 2rem;
    border-radius: var(--cms-radius);
    margin: calc(var(--cms-spacing-unit) * 2) auto;
    max-width: 750px;
    font-family: var(--cms-font-serif);
    line-height: 1.6;
    color: var(--text-color);
    position: relative;
    border: 1px solid var(--border-color);
    text-align: left;
    font-size: 1rem;
}

.paper-abstract::before {
    content: "Abstract";
    position: absolute;
    top: -10px;
    left: 20px;
    background: var(--bg-color);
    padding: 0 8px;
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
    font-family: var(--cms-font-sans);
}

/* --- Paper Navigation (Right Sidebar) --- */
.paper-nav {
    position: fixed;
    right: 2rem;
    top: 150px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--cms-radius);
    box-shadow: var(--shadow-soft);
    z-index: 100;
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    width: 200px;
}

@media (min-width: 1200px) { .paper-nav { opacity: 1; visibility: visible; } }
.paper-nav ul { list-style: none; padding: 0; margin: 0; }
.paper-nav li { margin: 0.4rem 0; }
.paper-nav a { color: var(--text-color); text-decoration: none; font-size: 0.85rem; transition: var(--cms-transition); display: block; padding: 0.2rem 0 0.2rem 1rem; font-family: var(--cms-font-sans); position: relative; border-left: 2px solid transparent; }
.paper-nav a:hover { color: var(--primary-color); background-color: var(--section-bg-color); }
.paper-nav a.active { color: var(--primary-color); font-weight: 600; border-left-color: var(--primary-color); }

/* --- Main Content --- */
.paper-content {
    font-family: var(--cms-font-serif);
    line-height: var(--cms-line-height-base);
    color: var(--text-color);
    font-size: 1.05rem;
    margin-top: calc(var(--cms-spacing-unit) * 2);
}

.paper-content h2, .paper-content h3, .paper-content h4, .paper-content h5, .paper-content h6 {
    font-family: var(--cms-font-heading);
    color: var(--primary-color);
    margin-top: calc(var(--cms-spacing-unit) * 2.5);
    margin-bottom: calc(var(--cms-spacing-unit) * 1.2);
    line-height: 1.3;
    scroll-margin-top: 80px;
    transition: all 0.3s ease;
}
.paper-content h2 { font-size: 2rem; border-bottom: 2px solid var(--primary-color); padding-bottom: 0.6rem; }
.paper-content h3 { font-size: 1.6rem; }
.paper-content h4 { font-size: 1.3rem; font-weight: 600; color: var(--text-color); }
.paper-content h2.active, .paper-content h3.active { color: var(--secondary-color); }
.paper-content p { margin-bottom: calc(var(--cms-spacing-unit) * 1.2); text-align: justify; max-width: 70ch; }
.paper-content a { color: var(--primary-color); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
.paper-content a:hover { color: var(--secondary-color); text-decoration-thickness: 2px; }
.paper-content ul, .paper-content ol { margin: var(--cms-spacing-unit) 0 calc(var(--cms-spacing-unit) * 1.2); padding-left: calc(var(--cms-spacing-unit) * 2); }
.paper-content li { margin-bottom: calc(var(--cms-spacing-unit) * 0.5); }

/* --- Code Blocks --- */
.paper-content pre[class*="language-"] { background: var(--code-bg); border: 1px solid var(--code-border); border-radius: var(--cms-radius); padding: 1.2em; margin: calc(var(--cms-spacing-unit) * 1.5) 0; overflow: auto; position: relative; font-size: 0.9em; box-shadow: inset 0 1px 3px rgba(0,0,0,0.05); }
.paper-content pre[class*="language-"] code { color: var(--code-text); font-family: var(--cms-font-code); text-shadow: none; background: none; padding: 0; font-size: 1em; }
.line-numbers .line-numbers-rows { border-right: 1px solid var(--code-border); padding-right: 1em; }
.line-numbers-rows > span:before { color: var(--code-comment); opacity: 0.6; }
.copy-to-clipboard-button { position: absolute; top: 0.5em; right: 0.5em; padding: 0.3em 0.6em; background: var(--primary-color); color: var(--bg-color); border: none; border-radius: 4px; cursor: pointer; font-size: 0.8em; opacity: 0; transition: opacity 0.2s ease; z-index: 1; }
pre[class*="language-"]:hover .copy-to-clipboard-button { opacity: 0.7; }
.copy-to-clipboard-button:hover { opacity: 1; }
pre[class*="language-"] > .toolbar .toolbar-item > span { color: var(--code-comment); font-size: 0.8em; text-transform: uppercase; }

/* --- Figures and Tables --- */
.paper-content figure { margin: calc(var(--cms-spacing-unit) * 2.5) 0; text-align: center; }
.paper-content figure img { max-width: 100%; height: auto; border-radius: var(--cms-radius); box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); margin-bottom: 0.5rem; }
.paper-content figcaption { margin-top: 0.5rem; font-size: 0.9rem; color: var(--light-text-color); font-family: var(--cms-font-sans); font-style: italic; }
.paper-content .table-container { overflow-x: auto; max-width: 100%; margin: calc(var(--cms-spacing-unit) * 2) 0; border: 1px solid var(--border-color); border-radius: var(--cms-radius); }
.paper-content table, .paper-content-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 0; border: none; min-width: 500px; }
.paper-content th, .paper-content td { padding: 0.75rem 1rem; border: none; border-bottom: 1px solid var(--border-color); text-align: left; vertical-align: top; }
.paper-content tr:last-child td { border-bottom: none; }
.paper-content thead { background-color: var(--section-bg-color); border-bottom: 2px solid var(--border-color); }
.paper-content th { font-weight: 600; color: var(--primary-color); font-family: var(--cms-font-sans); border-bottom-width: 2px; }
.paper-content tr:hover { background-color: var(--section-bg-color); }

/* --- Tags & Keywords --- */
.paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.paper-tag {
    background: var(--section-bg-color);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-color);
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    cursor: pointer;
}

.paper-tag:hover {
    background: var(--primary-color);
    color: var(--bg-color);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.paper-keywords { margin-top: var(--cms-spacing-unit); font-size: 0.9em; opacity: 0.8; font-family: var(--cms-font-sans); color: var(--light-text-color); }
.paper-keywords strong { font-weight: 600; color: var(--text-color); }

/* --- Table of Contents --- */
.paper-toc { background: var(--section-bg-color); padding: 1.5rem 2rem; border-radius: var(--cms-radius); margin: calc(var(--cms-spacing-unit) * 2) 0; border: 1px solid var(--border-color); position: relative; box-shadow: var(--shadow-soft); }
.paper-toc h2 { font-family: var(--cms-font-heading); font-size: 1.5rem; margin: 0 0 1rem; color: var(--primary-color); padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-color); }
.paper-toc ul { list-style: none; padding: 0; margin: 0; }
.paper-toc ul ul { padding-left: 1.5rem; margin: 0.3rem 0; border-left: 1px solid var(--border-color); }
.paper-toc li { position: relative; }
.paper-toc a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.95rem;
    line-height: 1.5;
    transition: var(--cms-transition);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 8px; /* Add space between title and reading time */
    padding: 0.3rem 0;
    position: relative;
    font-family: var(--cms-font-sans);
}
.paper-toc a:hover { color: var(--primary-color); transform: translateX(4px); }
.paper-toc a.active { color: var(--primary-color); font-weight: 600; }
.paper-toc a.active::after { content: ''; position: absolute; left: -1rem; top: 50%; transform: translateY(-50%); width: 5px; height: 5px; border-radius: 50%; background-color: var(--primary-color); }

/* Optional: If the reading time is in a separate span, we can style it */
.paper-toc a span {
    color: var(--light-text-color);
    font-size: 0.9em;
    white-space: nowrap;
}

/* --- Recommendation: Style Works Cited Section --- */
/* Target the last ordered list, assuming it's the Works Cited */
.paper-content ol:last-of-type {
    margin-top: calc(var(--cms-spacing-unit) * 2);
    padding-top: calc(var(--cms-spacing-unit) * 1.5);
    border-top: 1px solid var(--border-color);
    list-style-type: decimal; /* Ensure numbers are shown */
}

.paper-content ol:last-of-type li {
    margin-bottom: calc(var(--cms-spacing-unit) * 0.8); /* Slightly more space between citations */
    font-size: 0.9rem; /* Slightly smaller font size */
    line-height: 1.5; /* Adjust line height for readability */
    padding-left: 0; /* Reset padding if needed */
    color: var(--light-text-color); /* Use lighter text color */
}

.paper-content ol:last-of-type li a {
    color: var(--primary-color); /* Use primary color for links */
    text-decoration: underline;
    word-break: break-all; /* Break long URLs */
}

.paper-content ol:last-of-type li a:hover {
    color: var(--secondary-color);
    text-decoration: none; /* Remove underline on hover */
}
/* --- End Works Cited Styling --- */

/* --- Section Navigation Dots (Right side) --- */
.section-nav { position: fixed; right: 1.5rem; top: 50%; transform: translateY(-50%); display: flex; flex-direction: column; gap: 0.8rem; z-index: 100; opacity: 0; visibility: hidden; transition: opacity 0.3s ease, visibility 0.3s ease; }
@media (min-width: 1200px) { .section-nav { opacity: 1; visibility: visible; } }
.section-indicator { width: 10px; height: 10px; border-radius: 50%; background: var(--border-color); cursor: pointer; transition: var(--cms-transition); position: relative; border: 1px solid transparent; }
.section-indicator:hover, .section-indicator.active { background: var(--primary-color); transform: scale(1.3); border-color: var(--primary-color); }
.section-indicator:hover::before { content: attr(data-title); position: absolute; right: 20px; top: 50%; transform: translateY(-50%); background: var(--bg-color); color: var(--text-color); padding: 0.4rem 0.8rem; border-radius: 4px; font-size: 0.8rem; white-space: nowrap; box-shadow: 0 1px 3px rgba(0,0,0,0.1); border: 1px solid var(--border-color); opacity: 0; visibility: hidden; transition: opacity 0.2s ease 0.1s, visibility 0.2s ease 0.1s; font-family: var(--cms-font-sans); z-index: 101; }
.section-indicator:hover:before { opacity: 1; visibility: visible; }

/* Reading Progress Bar */
.reading-progress { position: fixed; top: 0; left: 0; width: 100%; height: 4px; background-color: transparent; z-index: 1001; pointer-events: none; }
.reading-progress-bar { height: 100%; background: linear-gradient(to right, var(--primary-color), var(--accent-color)); width: 0%; transition: width 0.2s ease-out; border-radius: 0 2px 2px 0; }

/* Reading Stats */
.reading-stats {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    top: 15px;
    background: var(--bg-color);
    padding: 4px 10px; /* Even more compact padding */
    border-radius: 12px; /* More compact border radius */
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    font-size: 0.75rem; /* Smaller font size */
    display: inline-flex; /* Changed to inline-flex for better width control */
    align-items: center;
    gap: 6px; /* Smaller gap */
    z-index: 1000;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    width: auto; /* Let content determine width */
    max-width: 80px; /* Limit maximum width */
    justify-content: center; /* Center the content */
    white-space: nowrap; /* Prevent wrapping */
}

.reading-stats .reading-percent {
    font-weight: 600;
    color: var(--primary-color);
}

/* --- Responsive Adjustments --- */
@media (max-width: 1200px) { .paper-nav, .section-nav { display: none; } }
@media (max-width: 768px) {
    .paper-container { padding: 1.5rem 1rem; }
    .paper-title { font-size: 2rem; }
    .paper-meta { font-size: 0.85rem; gap: 0.5rem 1rem; }
    .paper-abstract { padding: 1.5rem; font-size: 0.95rem; }
    .paper-toc { padding: 1.5rem; margin: 1.5rem 0; }
    .paper-toc h2 { font-size: 1.3rem; }
    .paper-toc ul ul { padding-left: 1rem; }
    .paper-content { font-size: 1rem; }
    .paper-content h2 { font-size: 1.7rem; }
    .paper-content h3 { font-size: 1.4rem; }
    .paper-content h4 { font-size: 1.15rem; }
    .paper-content p { max-width: none; }
    .paper-content .table-container { border-radius: 4px; }
    .paper-content table { font-size: 0.85rem; }
    .paper-content th, .paper-content td { padding: 0.6rem 0.8rem; }
    .reading-stats {
        max-width: none; /* Remove max-width constraint on mobile */
        padding: 6px 12px; /* Slightly larger padding on mobile */
        font-size: 0.8rem; /* Slightly larger font on mobile */
    }
    /* Ensure works cited list items are readable */
    .paper-content ol:last-of-type li { font-size: 0.85rem; }
}