/* ================================================
   Shubham Shukla — Personal Professional Site
   Claude-inspired warm dark theme
   ================================================ */

/* --- CSS Variables --- */
:root {
    --bg: #faf6f1;
    --bg-alt: #f0ebe4;
    --text: #292524;
    --text-muted: #78716c;
    --link: #b45309;
    --link-hover: #92400e;
    --border: #e2ddd5;
    --code-bg: #f0ebe4;
    --tag-bg: #ece6dd;
    --upcoming-bg: #ecfdf5;
    --upcoming-text: #047857;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 17px;
    scroll-behavior: smooth;
}

body {
    font-family: 'IBM Plex Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Container --- */
.container {
    max-width: 750px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* --- Navigation --- */
nav {
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
    margin-bottom: 2.5rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
    position: relative;
}

nav a:hover {
    color: var(--text);
}

nav a.active {
    color: var(--text);
}

nav a.active::before {
    content: '> ';
}

nav a.disabled {
    color: #c4bdb4;
    cursor: default;
    pointer-events: none;
}

/* --- Header --- */
header {
    margin-bottom: 3rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
}

.intro {
    flex: 1;
}

.intro h1 {
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 0.3rem;
    color: var(--text);
}

.descriptor {
    font-size: 0.85rem;
    color: var(--text);
    font-weight: 500;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.tagline {
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 0.95rem;
    color: #57534e;
    line-height: 1.6;
    margin-bottom: 1.2rem;
}

.tagline p {
    margin: 0;
}

.cursor {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
    .cursor {
        animation: none;
    }
}

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-size: 0.85rem;
}

.links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.links a:hover {
    color: var(--link);
}

.links a::before {
    content: '[';
}

.links a::after {
    content: ']';
}

/* --- Portrait --- */
.portrait-container {
    flex-shrink: 0;
}

.portrait {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center 15%;
    filter: grayscale(20%);
    transition: filter 0.3s;
}

.portrait:hover {
    filter: grayscale(0%);
}

.portrait-placeholder {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: #e7e0d8;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
}

.portrait-placeholder svg {
    width: 60px;
    height: 60px;
    opacity: 0.3;
}

/* --- Callout --- */
.callout {
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 1.5rem;
    line-height: 1.6;
    font-style: italic;
}

/* --- Section Headers --- */
.section-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

/* --- About / Bio --- */
.about {
    margin-bottom: 3rem;
    border-bottom: 1px dotted var(--border);
    padding-bottom: 3rem;
}

.about p {
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 1rem;
    line-height: 1.85;
    color: var(--text);
    margin-bottom: 1rem;
}

.about p:last-child {
    margin-bottom: 0;
}

.about a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.about a:hover {
    border-bottom-color: var(--link);
}

/* --- News Section --- */
.news {
    margin-bottom: 3rem;
    border-bottom: 1px dotted var(--border);
    padding-bottom: 3rem;
}

.news-list {
    list-style: none;
}

.news-item {
    display: flex;
    gap: 1.5rem;
    padding: 0.4rem 0;
    font-size: 0.9rem;
    align-items: baseline;
}

.news-date {
    flex-shrink: 0;
    width: 70px;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: right;
}

.news-text {
    flex: 1;
    color: var(--text);
}

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

.news-text a:hover {
    text-decoration: underline;
}

/* --- Upcoming Badge --- */
.badge-upcoming {
    display: inline-block;
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    background: var(--upcoming-bg);
    color: var(--upcoming-text);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* --- Service/Review Section --- */
.service {
    margin-bottom: 3rem;
    border-bottom: 1px dotted var(--border);
    padding-bottom: 3rem;
}

.service-group {
    margin-bottom: 1rem;
}

.service-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}

.service-content {
    font-size: 0.9rem;
    color: var(--text);
    line-height: 1.6;
}

.service-content a {
    color: var(--link);
    text-decoration: none;
}

.service-content a:hover {
    text-decoration: underline;
}

/* --- Papers / Publications --- */
.papers {
    margin-bottom: 3rem;
    border-bottom: 1px dotted var(--border);
    padding-bottom: 3rem;
}

.paper {
    display: flex;
    gap: 1.5rem;
    padding: 1rem 0;
    border-bottom: 1px dotted var(--border);
    align-items: baseline;
}

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

.paper .year {
    flex-shrink: 0;
    width: 50px;
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.paper-content {
    flex: 1;
}

.paper-title {
    font-size: 0.95rem;
    color: var(--text);
    text-decoration: none;
    line-height: 1.5;
    display: block;
    margin-bottom: 0.3rem;
}

.paper-title:hover {
    color: var(--link);
}

.paper-authors {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}

.paper-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem;
}

.paper-venue {
    font-style: italic;
}

.paper-badge {
    display: inline-block;
    font-size: 0.7rem;
    padding: 0.1rem 0.45rem;
    border-radius: 3px;
    background: #fef3c7;
    color: #92400e;
    letter-spacing: 0.3px;
}

.paper-links {
    font-size: 0.8rem;
}

.paper-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.paper-links a:hover {
    color: var(--link);
}

.paper-links a::before {
    content: '[';
}

.paper-links a::after {
    content: ']';
}

.paper-links .sep {
    color: #d6d0c8;
    margin: 0 0.15rem;
}

.paper-note {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 0.2rem;
}

.all-papers {
    text-align: right;
    margin-top: 1.5rem;
    font-size: 0.85rem;
}

.all-papers a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.all-papers a:hover {
    color: var(--link);
}

/* --- Talks --- */
.talks {
    margin-bottom: 3rem;
}

.talk {
    display: flex;
    gap: 1.5rem;
    padding: 1rem 0;
    border-bottom: 1px dotted var(--border);
    align-items: baseline;
}

.talk:last-child {
    border-bottom: none;
}

.talk .date {
    flex-shrink: 0;
    width: 80px;
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.talk-content {
    flex: 1;
}

.talk-event {
    font-size: 0.95rem;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.talk-topic {
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 0.3rem;
}

.talk-role {
    display: inline-block;
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-weight: 500;
}

.role-moderator {
    background: #fef3c7;
    color: #92400e;
}

.role-speaker {
    background: #ecfdf5;
    color: #047857;
}

.role-panelist {
    background: #fce7f3;
    color: #9d174d;
}

/* --- Last section before the footer --- */
main > section:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* --- Footer --- */
footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* --- Generic link styling --- */
a {
    color: var(--link);
}

/* --- Page header for sub-pages --- */
.page-header {
    margin-bottom: 2.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 0.3rem;
}

.page-header .tagline {
    margin-bottom: 0;
}

/* --- Blog List --- */
.blog-list {
    margin-bottom: 3rem;
}

.blog-post {
    padding: 1.25rem 0;
    border-bottom: 1px dotted var(--border);
}

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

.post-date {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.blog-post h2 {
    font-size: 1.05rem;
    font-weight: 500;
    margin: 0.25rem 0;
}

.blog-post h2 a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}

.blog-post h2 a:hover {
    color: var(--link);
}

.post-excerpt {
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.post-tags {
    display: flex;
    gap: 0.5rem;
}

.tag {
    font-size: 0.7rem;
    padding: 0.1rem 0.45rem;
    border-radius: 3px;
    background: var(--tag-bg);
    color: var(--text-muted);
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

/* --- Blog Post Page --- */
.post-header {
    margin-bottom: 2rem;
}

.back-link {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-decoration: none;
    display: inline-block;
    margin-bottom: 1.5rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--link);
}

.post-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.3px;
    margin-bottom: 0.5rem;
}

.post-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.post-content {
    margin-bottom: 3rem;
}

.post-content p {
    font-family: 'Georgia', 'Times New Roman', serif;
    font-size: 1rem;
    line-height: 1.85;
    color: var(--text);
    margin-bottom: 1rem;
}

.post-content h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
}

.post-content a {
    color: var(--link);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.post-content a:hover {
    border-bottom-color: var(--link);
}

/* --- Responsive --- */
@media (max-width: 600px) {
    html {
        font-size: 15px;
    }

    .container {
        padding: 2rem 1.5rem;
    }

    nav ul {
        gap: 1rem;
    }

    .header-content {
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
    }

    .intro h1 {
        font-size: 1.5rem;
    }

    .links {
        justify-content: center;
    }

    .portrait, .portrait-placeholder {
        width: 120px;
        height: 120px;
    }

    .about, .news, .service, .papers, .talks {
        margin-bottom: 2rem;
        padding-bottom: 2rem;
    }

    .paper {
        flex-direction: column;
        gap: 0.25rem;
    }

    .paper .year {
        text-align: left;
        width: auto;
    }

    .talk {
        flex-direction: column;
        gap: 0.25rem;
    }

    .talk .date {
        text-align: left;
        width: auto;
    }

    .news-item {
        flex-direction: column;
        gap: 0.2rem;
    }

    .news-date {
        text-align: left;
        width: auto;
    }
}