/* ============================================================
   Brahadeesh Sankarnarayanan — Personal Website Stylesheet
   ============================================================
   Hierarchical LaTeX-inspired theme. Latin Modern Roman body text,
   minimal color, dotted-line separators throughout.
   ============================================================ */


/* ============================================================
   VARIABLES & BASE
   ============================================================ */

:root {
    --text: #000000;
    --grey: #444444;
    --border: #dddddd;
    --bg: #ffffff;
}

body {
    font-family: "Latin Modern Roman", Georgia, serif;
    font-size: 13pt;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    margin: 0;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 50px;
}


/* ============================================================
   NAVIGATION
   ============================================================ */

nav {
    padding: 40px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 50px;
}

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

nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    gap: 30px;
    padding: 0;
}

nav a {
    text-decoration: none;
    color: var(--text);
    font-size: 1.1rem;
}


/* --- CAT Lab branding (left side of nav) --- */

.logo-area {
    display: flex;
    align-items: center;
    gap: 15px;
}

.lab-logo-img {
    height: 80px;
    width: auto;
    border: none;
    padding: 2px;
}

.lab-name {
    display: flex;
    flex-direction: column;
}

.lab-title {
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1;
    letter-spacing: 1px;
}

.lab-subtitle {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--grey);
    margin-top: 4px;
}


/* ============================================================
   SECTION HEADERS
   ============================================================ */

h2 {
    font-size: 1.8rem;
    font-weight: bold;
    margin: 80px 0 40px 0;
    border-bottom: 1px solid var(--text);
    padding-bottom: 10px;
}


/* ============================================================
   THESIS FIGURE / CALLING CARD
   ============================================================ */

.thesis-figure {
    margin: 30px 0;
    padding: 15px;
    border: 1px solid var(--border);
    background-color: #fafafa;
    text-align: center;
}

.thesis-img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 15px auto;
}

.figure-caption {
    font-size: 11pt;
    color: var(--grey);
    font-style: italic;
    line-height: 1.4;
    margin: 0;
}


/* ============================================================
   HOME PAGE
   ============================================================ */

/* --- Hero / Profile section --- */

.profile-section {
    display: grid;
    grid-template-columns: 1fr 200px;
    gap: 40px;
    align-items: start;
    margin-bottom: 60px;
}

.profile-name {
    font-size: 2rem;
    font-weight: bold;
    margin: 0 0 5px 0;
    line-height: 1.2;
}

.profile-subtitle {
    font-size: 1rem;
    color: var(--grey);
    font-style: italic;
    margin: 0 0 25px 0;
}

.profile-photo {
    width: 100%;
    height: auto;
    display: block;
    border: none ; /* 1px solid var(--border) */
    margin: 0 0 20px 0;
}

.contact-links {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 11pt;
}

.contact-links li {
    padding: 6px 0;
    border-bottom: 1px dotted var(--border);
}

.contact-links li:last-child {
    border-bottom: none;
}

.contact-links a {
    color: var(--text);
    text-decoration: none;
}

.contact-links a:hover {
    text-decoration: underline;
    color: #0056b3;
}


/* --- Lab members --- */

.lab-subhead {
    font-size: 1.1rem;
    font-weight: bold;
    font-variant: small-caps;
    letter-spacing: 1px;
    margin: 30px 0 12px 0;
}

.lab-members {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 12pt;
}

.lab-members li {
    padding: 6px 0;
    border-bottom: 1px dotted var(--border);
}

.lab-members li:last-child {
    border-bottom: none;
}


/* --- Inquiry checklist (Working with me) --- */

.inquiry-checklist {
    margin: 12px 0 16px 0;
    padding-left: 25px;
}

.inquiry-checklist li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.inquiry-checklist li:last-child {
    margin-bottom: 0;
}


/* --- News list --- */

.news-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.news-list > li {
    padding: 14px 0;
    border-bottom: 1px dotted var(--border);
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 20px;
    align-items: baseline;
}

.news-list > li:last-child {
    border-bottom: none;
}

.news-date {
    color: var(--grey);
    font-size: 11pt;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-variant: small-caps;
}

.news-content {
    margin: 0;
    line-height: 1.5;
}


/* --- Contact section (bottom of home page) --- */

.contact-section address {
    font-style: normal;
    line-height: 1.7;
    margin: 0 0 18px 0;
}

.contact-section .profile-list {
    margin: 25px 0 0 0;
    line-height: 1.8;
    color: var(--grey);
}

.contact-section .profile-list a {
    color: var(--text);
    text-decoration: underline;
}

.contact-section .profile-list a:hover {
    color: #0056b3;
}


/* ============================================================
   RESEARCH PAGE
   ============================================================ */

.intro-text {
    font-size: 14pt;
    margin-bottom: 50px;
    font-style: italic;
    color: var(--grey);
}

.research-block {
    margin-bottom: 60px;
}

.research-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
    margin-bottom: 20px;
}

.research-title {
    font-size: 1.4rem;
    font-weight: bold;
}

.research-affiliation {
    font-size: 11pt;
    color: var(--grey);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.research-content p {
    font-size: 13pt;
    line-height: 1.7;
    margin-bottom: 15px;
}


/* ============================================================
   PUBLICATIONS PAGE — Compact layout
   ============================================================ */

/* --- Pub row container --- */

.pub-row {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px dotted var(--border);
}

.pub-row:last-child {
    border-bottom: none;
    margin-bottom: 0;
}


/* --- The visible lines per paper --- */

.pub-authors {
    font-size: 1.05rem;
    color: var(--grey);
    margin: 0 0 4px 0;
    line-height: 1.4;
}

.pub-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text);
    margin: 0 0 8px 0;
    line-height: 1.35;
}

.pub-journal {
    font-size: 12pt;
    color: var(--text);
    margin: 0 0 6px 0;
    line-height: 1.55;
}

.pub-journal a {
    color: var(--text);
    text-decoration: underline;
}

.pub-journal a:hover {
    color: #0056b3;
    text-decoration: none;
}

.pub-taxonomy {
    font-size: 10.5pt;
    color: var(--grey);
    line-height: 1.5;
    margin: 0;
}

.pub-taxonomy strong {
    color: var(--text);
    font-variant: small-caps;
    letter-spacing: 0.3px;
}

.pub-addendum {
    font-size: 11pt;
    color: var(--grey);
    font-style: italic;
    margin: 8px 0 0 0;
    line-height: 1.5;
}

.pub-addendum a {
    color: var(--text);
}

.pub-addendum a:hover {
    color: #0056b3;
}


/* --- Errata: inline toggle + collapsible panel --- */

.errata-toggle {
    display: inline;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 0;
    margin-left: 4px;
    font-family: inherit;
    font-size: inherit;
    font-style: italic;
    text-decoration: underline;
}

.errata-toggle:hover {
    color: #0056b3;
}

.errata-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.errata-inner {
    margin: 8px 0 0 20px;
    padding: 4px 0 4px 15px;
    border-left: 2px solid var(--border);
}

.errata-list {
    list-style: none;
    padding: 0;
    margin: 4px 0 0 0;
    font-size: 11pt;
    color: var(--grey);
    line-height: 1.6;
}

.errata-list li {
    padding: 2px 0;
}

.errata-list li::before {
    content: "—";
    margin-right: 8px;
    color: var(--border);
}


/* --- Abstract: toggle + collapsible panel --- */

.abstract-toggle {
    display: inline-block;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 0;
    margin: 10px 0 0 0;
    font-family: inherit;
    font-size: 10pt;
    text-decoration: underline;
}

.abstract-toggle:hover {
    color: #0056b3;
}

.abstract-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.abstract-inner {
    margin: 12px 0 0 20px;
    padding: 8px 0 8px 15px;
    border-left: 2px solid var(--border);
    font-size: 12pt;
    color: var(--grey);
    line-height: 1.6;
    overflow-wrap: break-word;
}

/* MathJax fixes scoped to abstract-inner */

.abstract-inner mjx-container[display="true"] {
    margin: 1em 0 !important;
}

.abstract-inner mjx-container:not([display="true"]) {
    vertical-align: baseline !important;
    position: relative;
    top: 0.05em;
}

.abstract-inner mjx-sub {
    vertical-align: -0.25em !important;
}


/* ============================================================
   ACTIVITIES PAGE
   ============================================================ */

.activity-block {
    margin-bottom: 60px;
}

.activity-block h3,
.teaching-block h3 {
    border-bottom: 1px solid var(--border);
    padding-bottom: 5px;
    margin-bottom: 25px;
    font-variant: small-caps;
    letter-spacing: 1px;
    font-size: 1.2rem;
    font-weight: bold;
}

.activity-block h4 {
    font-size: 12pt;
    font-weight: bold;
    font-variant: small-caps;
    letter-spacing: 0.5px;
    margin: 25px 0 10px 0;
    color: var(--grey);
}

.activity-block h4:first-of-type {
    margin-top: 0;
}

.service-text {
    font-size: 13pt;
    line-height: 1.8;
}


/* --- Dated list (talks, honors, service, project supervision) --- */

.dated-list {
    list-style: none;
    padding: 0;
    margin: 0 0 15px 0;
}

.dated-list li {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 20px;
    padding: 8px 0;
    border-bottom: 1px dotted var(--border);
    align-items: baseline;
    line-height: 1.5;
}

.dated-list li:last-child {
    border-bottom: none;
}

.dated-list .date-col {
    color: var(--grey);
    font-size: 11pt;
    font-variant: small-caps;
    letter-spacing: 0.5px;
    white-space: nowrap;
}


/* --- Review list (MathSciNet / zbMATH entries) --- */

.review-list {
    list-style: none;
    padding: 0;
    margin: 0 0 15px 0;
}

.review-list li {
    padding: 8px 0;
    border-bottom: 1px dotted var(--border);
    line-height: 1.5;
    font-size: 12pt;
}

.review-list li:last-child {
    border-bottom: none;
}


/* --- Resource list (hard-to-find papers) --- */

.resource-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.resource-list li {
    padding: 12px 0;
    border-bottom: 1px dotted var(--border);
    line-height: 1.5;
    font-size: 12pt;
}

.resource-list li:last-child {
    border-bottom: none;
}


/* --- Plain bulleted list (service items) --- */

.plain-list {
    margin: 8px 0 15px 0;
    padding-left: 25px;
}

.plain-list li {
    margin-bottom: 4px;
    line-height: 1.5;
}


/* ============================================================
   TEACHING PAGE
   ============================================================ */

.teaching-block {
    margin-bottom: 70px;
}


/* --- Plain course list (no detailed feedback) --- */

.course-list {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 20px 0;
    font-size: 12pt;
}

.course-list td {
    padding: 6px 0;
    border-bottom: 1px dotted var(--border);
    vertical-align: baseline;
    color: var(--text);
}

.course-list tr:last-child td {
    border-bottom: none;
}

.course-list .course-code {
    color: var(--grey);
    font-variant: small-caps;
    letter-spacing: 0.5px;
    width: 100px;
    white-space: nowrap;
    padding-right: 20px;
}

.course-list .course-term {
    color: var(--grey);
    font-size: 11pt;
    text-align: right;
    width: 200px;
    white-space: nowrap;
}


/* --- Featured course (with evaluation data) --- */

.course-feature {
    margin: 0 0 35px 0;
}

.course-feature-header {
    display: flex;
    align-items: baseline;
    padding: 6px 0;
    font-size: 12pt;
}

.course-feature-header .course-code {
    flex: 0 0 100px;
    padding-right: 20px;
    color: var(--grey);
    font-variant: small-caps;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.course-feature-header .course-title {
    flex: 1;
    color: var(--text);
}

.course-feature-header .course-term {
    flex: 0 0 200px;
    text-align: right;
    color: var(--grey);
    font-size: 11pt;
    white-space: nowrap;
}

.course-desc {
    margin: 0 0 6px 0;
    line-height: 1.6;
    font-size: 12pt;
}

.course-meta {
    margin: 0;
    font-size: 11pt;
    color: var(--grey);
    line-height: 1.5;
}

.meta-label {
    font-variant: small-caps;
    letter-spacing: 0.5px;
    color: var(--text);
    font-size: 10pt;
    margin-right: 3px;
}

.meta-sep {
    margin: 0 8px;
    color: var(--border);
}


/* --- Course feedback panel --- */

.feedback-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.feedback-inner {
    padding: 0 0 10px 0;
}

.feedback-inner h4 {
    font-size: 11pt;
    font-variant: small-caps;
    letter-spacing: 0.5px;
    font-weight: bold;
    margin: 18px 0 8px 0;
    color: var(--text);
}

.feedback-inner h4:first-child {
    margin-top: 0;
}

.metric-list {
    list-style: none;
    padding: 0;
    margin: 0 0 10px 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 30px;
    font-size: 11pt;
    color: var(--grey);
}

.student-feedback {
    margin: 8px 0;
    padding-left: 15px;
    border-left: 2px solid var(--border);
    font-style: italic;
    font-size: 11pt;
    color: var(--grey);
    line-height: 1.5;
}

.feedback-toggle {
    display: inline-block;
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 0;
    margin-top: 8px;
    font-family: inherit;
    font-size: 10pt;
    text-decoration: underline;
}

.feedback-toggle:hover {
    color: #0056b3;
}


/* --- Teaching list (used by Activities page for talks) --- */

.teaching-list {
    list-style: none;
    padding: 0;
}

.teaching-list li {
    padding: 8px 0;
    border-bottom: 1px dotted var(--border);
    color: var(--text);
}

.teaching-list li:last-child {
    border-bottom: none;
}

.course-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 15px;
}

.course-main {
    flex: 1;
}

.course-date {
    color: var(--grey);
    font-size: 11pt;
    white-space: nowrap;
}

.teaching-list .course-desc {
    display: block;
    margin: 4px 0 0 0;
    color: var(--grey);
    font-size: 11pt;
}


/* ============================================================
   BLOG PAGES
   ============================================================ */

/* --- Blog index --- */

.blog-intro {
    font-size: 12pt;
    color: var(--text);
    line-height: 1.6;
    margin: 0 0 35px 0;
    max-width: 700px;
}

.blog-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.blog-entry {
    padding: 22px 0;
    border-bottom: 1px dotted var(--border);
}

.blog-entry:last-child {
    border-bottom: none;
}

.blog-entry-meta {
    font-size: 10pt;
    color: var(--grey);
    margin-bottom: 6px;
}

.blog-date {
    font-variant: small-caps;
    letter-spacing: 0.5px;
}

.blog-category {
    margin-left: 14px;
    font-size: 9.5pt;
    font-variant: small-caps;
    letter-spacing: 0.5px;
}

.blog-category::before {
    content: "\00B7";
    margin-right: 14px;
    color: var(--border);
}

.blog-entry-title {
    margin: 4px 0 8px 0;
    font-size: 1.25rem;
    font-weight: bold;
    line-height: 1.3;
}

.blog-entry-title a {
    color: var(--text);
    text-decoration: none;
}

.blog-entry-title a:hover {
    color: #0056b3;
    text-decoration: underline;
}

.blog-entry-excerpt {
    margin: 0;
    font-size: 12pt;
    color: var(--grey);
    line-height: 1.5;
    max-width: 700px;
}


/* --- Blog post page --- */

.blog-post-container {
    max-width: 720px;
}

.blog-back {
    font-size: 11pt;
    margin: 0 0 25px 0;
}

.blog-back a {
    color: var(--grey);
    text-decoration: none;
}

.blog-back a:hover {
    color: var(--text);
    text-decoration: underline;
}

.blog-post-header {
    margin: 10px 0 30px 0;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.blog-post-header h1 {
    font-size: 2rem;
    margin: 0 0 10px 0;
    line-height: 1.2;
    font-weight: bold;
}

.blog-post-meta {
    margin: 0;
    font-size: 11pt;
    color: var(--grey);
}

.blog-post-body {
    font-size: 12pt;
    line-height: 1.7;
}

.blog-post-body p {
    margin: 0 0 18px 0;
}

.blog-post-body h2 {
    font-size: 1.5rem;
    margin: 32px 0 12px 0;
    border-bottom: none;
    font-variant: normal;
    letter-spacing: 0;
}

.blog-post-body h3 {
    font-size: 1.2rem;
    margin: 24px 0 10px 0;
}

.blog-post-body a {
    color: var(--text);
    text-decoration: underline;
}

.blog-post-body a:hover {
    color: #0056b3;
}

.blog-post-body code {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.92em;
    background: #f5f5f5;
    padding: 1px 5px;
    border-radius: 2px;
}

.blog-post-body pre {
    background: #f8f8f8;
    border: 1px solid var(--border);
    padding: 14px 16px;
    overflow-x: auto;
    font-size: 11pt;
    line-height: 1.5;
    margin: 18px 0;
}

.blog-post-body pre code {
    background: none;
    padding: 0;
    border-radius: 0;
}

.blog-post-body blockquote {
    margin: 18px 0;
    padding: 4px 0 4px 20px;
    border-left: 3px solid var(--border);
    color: var(--grey);
    font-style: italic;
}

.blog-post-body ul,
.blog-post-body ol {
    margin: 14px 0 18px 0;
    padding-left: 28px;
}

.blog-post-body ul li,
.blog-post-body ol li {
    margin-bottom: 6px;
    line-height: 1.6;
}

.blog-post-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 22px auto;
}

.blog-post-body figure {
    margin: 24px 0;
    text-align: center;
}

.blog-post-body figcaption {
    font-size: 10pt;
    color: var(--grey);
    margin-top: 8px;
    font-style: italic;
}

.blog-post-body hr {
    margin: 32px 0;
    border: none;
    border-top: 1px solid var(--border);
}


/* ============================================================
   FOOTER
   ============================================================ */

footer {
    margin-top: 80px;
    padding-bottom: 40px;
    color: var(--grey);
}

.footer-line {
    border: 0;
    border-top: 1px solid var(--border);
    margin-bottom: 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    font-size: 11pt;
}


/* ============================================================
   RESPONSIVE — Mobile (≤ 768px)
   ============================================================
   Single consolidated media query, placed last so mobile rules
   override desktop rules regardless of source order.
   ============================================================ */

@media (max-width: 768px) {

    /* --- Container & navigation --- */

    .container {
        width: 95%;
        padding: 0 15px;
    }

    nav .container {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    nav ul {
        gap: 15px;
    }

    /* --- Two-column layouts: stack vertically --- */

    .profile-section,
    .research-header {
        display: block;
    }

    .profile-sidebar {
        margin-top: 40px;
    }

    .research-affiliation {
        margin-bottom: 10px;
        text-align: left;
        border-bottom: 1px dotted var(--border);
        padding-bottom: 5px;
    }

    /* --- Home page news list --- */

    .news-list > li {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    /* --- Activities: dated list --- */

    .dated-list li {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    /* --- Publications: abstract panel --- */

    .abstract-inner {
        margin-left: 8px;
        padding-left: 10px;
    }

    /* --- Teaching: course feature header --- */

    .course-feature-header {
        flex-wrap: wrap;
        row-gap: 4px;
    }

    .course-feature-header .course-term {
        flex: 0 0 100%;
        text-align: left;
        padding-left: 100px;
    }

    .course-meta .meta-sep {
        margin: 0 6px;
    }

    .metric-list {
        grid-template-columns: 1fr;
    }

    .course-list .course-term,
    .course-list .course-code {
        width: auto;
    }

    /* --- Teaching list (course-info row) --- */

    .course-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .course-date {
        text-align: left;
        margin-top: 5px;
    }

    /* --- Footer --- */

    .footer-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
}

h3, h4 {
    scroll-margin-top: 80px;
}