/* ============================================
   Tulika Mitra - Global Styles
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=Open+Sans:wght@300;400;600;700&family=Lora:wght@400;500;600;700&display=swap');

/* NUS Brand Colors */
:root {
    --nus-blue: #003D7C;
    --nus-orange: #EF7C00;
    --nus-blue-light: #e8eef5;
    --nus-blue-hover: #002a56;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Open Sans', 'Roboto', sans-serif;
    color: #212121;
    background: #fff;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--nus-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Navigation Bar
   ============================================ */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    border-top: 3px solid var(--nus-orange);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    margin: 0 !important;
    padding: 0 !important;
    width: 100% !important;
    font-family: 'Roboto', 'Open Sans', sans-serif !important;
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 64px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--nus-blue);
}

.nav-brand:hover {
    text-decoration: none;
}

.nav-brand img {
    height: 28px;
    width: auto;
}

.nav-brand .nav-divider {
    width: 1px;
    height: 24px;
    background: #d0d0d0;
}

.nav-brand span {
    font-family: 'Roboto', sans-serif;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 1px;
    color: var(--nus-blue);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}

.nav-links > li {
    position: relative;
}

.nav-links > li > a {
    display: block;
    padding: 8px 16px;
    color: #3c4043;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    transition: background 0.2s;
    text-decoration: none;
}

.nav-links > li > a:hover,
.nav-links > li > a.active {
    background: #f1f3f4;
    text-decoration: none;
}

/* Dropdown */
.nav-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 180px;
    padding: 8px 0;
    z-index: 100;
    list-style: none;
}

.nav-dropdown li a {
    display: block;
    padding: 8px 20px;
    color: #3c4043;
    font-size: 13px;
    transition: background 0.2s;
    text-decoration: none;
}

.nav-dropdown li a:hover {
    background: #f1f3f4;
    text-decoration: none;
}

li:hover > .nav-dropdown {
    display: block;
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #3c4043;
    margin: 5px 0;
    transition: 0.3s;
}

/* Mobile */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 12px 0;
        border-bottom: 1px solid #e0e0e0;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links > li > a {
        padding: 12px 24px;
    }

    .nav-dropdown {
        position: static;
        box-shadow: none;
        border: none;
        border-radius: 0;
        padding-left: 20px;
    }

    li:hover > .nav-dropdown {
        display: none;
    }

    li.dropdown-open > .nav-dropdown {
        display: block;
    }
}

/* ============================================
   Page Container
   ============================================ */
.page-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* ============================================
   Hero Section (Home)
   ============================================ */
.hero {
    position: relative;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 24px;
}

.hero-content h1 {
    font-family: 'Lora', serif;
    font-size: 28px;
    font-weight: 400;
    font-style: italic;
    line-height: 1.5;
    margin-bottom: 16px;
}

.hero-content .hero-author {
    font-size: 16px;
    font-weight: 300;
    opacity: 0.9;
}

/* ============================================
   Section Styles
   ============================================ */
.section-title {
    font-family: 'Roboto', sans-serif;
    font-size: 24px;
    font-weight: 400;
    color: #212121;
    margin-bottom: 24px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--nus-orange);
    display: inline-block;
}

.section-block {
    margin-bottom: 48px;
}

/* ============================================
   Profile Card (Professor Page)
   ============================================ */
.profile-header {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    margin-bottom: 48px;
}

.profile-photo {
    width: 250px;
    min-width: 250px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.profile-info h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 28px;
    font-weight: 500;
    margin-bottom: 8px;
}

.profile-info .title {
    font-size: 16px;
    color: #5f6368;
    margin-bottom: 4px;
}

.profile-info .contact-list {
    list-style: none;
    margin-top: 12px;
}

.profile-info .contact-list li {
    font-size: 14px;
    color: #5f6368;
    margin-bottom: 4px;
}

@media (max-width: 768px) {
    .profile-header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-photo {
        width: 200px;
        min-width: auto;
    }
}

/* ============================================
   Team Grid
   ============================================ */
.team-category {
    margin-bottom: 48px;
}

.team-category h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 22px;
    font-weight: 400;
    color: #212121;
    margin-bottom: 24px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e0e0e0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.team-card {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: #fff;
    border: 1px solid #e8eaed;
    border-radius: 8px;
    transition: box-shadow 0.2s;
}

.team-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.team-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.team-card-info h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.team-card-info h3 a {
    color: #212121;
}

.team-card-info h3 a:hover {
    color: var(--nus-blue);
}

.team-card-info .role {
    font-size: 13px;
    color: #5f6368;
    margin-bottom: 6px;
}

.team-card-info .bio {
    font-size: 13px;
    color: #3c4043;
    line-height: 1.5;
}

/* PI card - larger */
.team-card.pi-card {
    grid-column: 1 / -1;
    max-width: 600px;
}

.team-card.pi-card img {
    width: 120px;
    height: 120px;
}

@media (max-width: 768px) {
    .team-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Sponsor Grid
   ============================================ */
.sponsor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 32px;
    align-items: center;
    justify-items: center;
    padding: 24px 0;
}

.sponsor-grid img {
    max-height: 60px;
    width: auto;
    filter: grayscale(20%);
    opacity: 0.85;
    transition: all 0.3s;
}

.sponsor-grid img:hover {
    filter: grayscale(0%);
    opacity: 1;
}

/* ============================================
   Blockquote
   ============================================ */
blockquote {
    border-left: 3px solid var(--nus-blue);
    padding: 16px 24px;
    margin: 24px 0;
    background: #f8f9fa;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: #3c4043;
}

blockquote cite {
    display: block;
    margin-top: 8px;
    font-style: normal;
    font-size: 14px;
    color: #5f6368;
}

/* ============================================
   Openings / Highlight Box
   ============================================ */
.highlight-box {
    background: var(--nus-blue-light);
    border-radius: 8px;
    padding: 24px;
    margin: 24px 0;
    border-left: 4px solid var(--nus-blue);
}

.highlight-box h3 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--nus-blue);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    padding: 32px 24px;
    color: #5f6368;
    font-size: 13px;
    margin-top: 60px;
}

.site-footer .footer-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.site-footer .footer-flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.site-footer .footer-left {
    text-align: left;
}

.site-footer .footer-address {
    margin-bottom: 16px;
}

.site-footer .footer-map {
    margin: 16px auto;
    max-width: 300px;
}

.site-footer .footer-copy {
    margin-top: 16px;
    font-size: 12px;
    color: #9aa0a6;
}

.site-footer .footer-globe {
    flex-shrink: 0;
    width: 300px;
}

@media (max-width: 600px) {
    .site-footer .footer-flex {
        flex-direction: column;
        text-align: center;
    }
    .site-footer .footer-left {
        text-align: center;
    }
    .site-footer .footer-globe {
        margin-top: 16px;
    }
}

/* ============================================
   Content Typography
   ============================================ */
.content p {
    margin-bottom: 16px;
    line-height: 1.8;
    color: #3c4043;
}

.content h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 22px;
    font-weight: 400;
    margin: 32px 0 16px;
    color: #212121;
}

.content ul, .content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.content li {
    margin-bottom: 8px;
    line-height: 1.6;
    color: #3c4043;
}

/* ============================================
   Full-width Image Section
   ============================================ */
.full-width-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

/* ============================================
   Alumni Section
   ============================================ */
.alumni-list {
    columns: 2;
    column-gap: 32px;
    list-style: none;
}

.alumni-list li {
    padding: 6px 0;
    font-size: 14px;
    color: #3c4043;
    break-inside: avoid;
}

.alumni-list li strong {
    color: #212121;
}

.alumni-list li .alumni-pos {
    color: #5f6368;
    font-size: 13px;
}

@media (max-width: 600px) {
    .alumni-list {
        columns: 1;
    }
}

/* ============================================
   Publications
   ============================================ */

.pub-year {
    font-family: 'Roboto', sans-serif;
    font-size: 22px;
    font-weight: 500;
    color: var(--nus-blue);
    margin: 32px 0 16px;
    padding-bottom: 6px;
    border-bottom: 2px solid #e8eaed;
}
.pub-list {
    list-style: none;
    padding: 0;
}
.pub-list li {
    padding: 12px 0;
    border-bottom: 1px solid #f1f3f4;
    line-height: 1.6;
    font-size: 14px;
}
.pub-list li:last-child {
    border-bottom: none;
}
.pub-title {
    font-weight: 600;
    color: #212121;
}
.pub-authors {
    color: #5f6368;
    font-size: 13px;
}
.pub-venue {
    color: var(--nus-blue);
    font-style: italic;
    font-size: 13px;
}
.pub-award {
    display: inline-block;
    margin-left: 6px;
    padding: 1px 10px;
    border-radius: 12px;
    background: #fff4e5;
    color: #b35c00;
    border: 1px solid var(--nus-orange);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    vertical-align: 1px;
}
.pub-highlight {
    display: inline-block;
    margin-left: 6px;
    padding: 0 8px;
    border-radius: 12px;
    color: var(--nus-blue);
    border: 1px solid #b6c6da;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    vertical-align: 1px;
}
.pub-filter {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.pub-filter button {
    padding: 6px 16px;
    border: 1px solid #e0e0e0;
    border-radius: 20px;
    background: #fff;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}
.pub-filter button:hover,
.pub-filter button.active {
    background: var(--nus-blue);
    color: #fff;
    border-color: var(--nus-blue);
}
.pub-link {
    color: var(--nus-blue);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    margin-left: 4px;
}
.pub-link:hover {
    text-decoration: underline;
}

/* Publication Search */
.pub-search-wrap {
    position: relative;
    margin-bottom: 24px;
}
.pub-search {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: inherit;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: #fff;
}
.pub-search:focus {
    border-color: var(--nus-blue);
    box-shadow: 0 0 0 3px rgba(0, 61, 124, 0.12);
}
.pub-search::placeholder {
    color: #9aa0a6;
}
.pub-search-count {
    display: block;
    margin-top: 8px;
    font-size: 13px;
    color: #5f6368;
}