/* ===============================
   GLOBAL RESET & BASE
   =============================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: #1f2937;          /* slate-800 */
    background-color: #ffffff;
}

a {
    color: #1a73e8;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ===============================
   LAYOUT UTILITIES
   =============================== */
.container {
    width: 90%;
    max-width: 1100px;
    margin: 0 auto;
}

.section {
    padding: 60px 0;
}

.section-light {
    background-color: #f9fafb;
}

/* ===============================
   NAVBAR
   =============================== */
.navbar {
    border-bottom: 1px solid #e5e7eb;
    background-color: #ffffff;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo a {
    font-size: 22px;
    font-weight: 700;
    color: #111827;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 22px;
}

.nav-links li a {
    font-size: 15px;
    color: #374151;
    padding: 6px 4px;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: #1a73e8;
    border-bottom: 2px solid #1a73e8;
}

/* ===============================
   HERO SECTION
   =============================== */
.hero {
    padding: 80px 0 60px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    align-items: center;
}

.hero-logo img {
    max-width: 260px;
    width: 100%;
}

.hero-text p {
    font-size: 18px;
    color: #374151;
}

/* Publication buttons */
.pub-btn {
    font-size: 12px;
    padding: 4px 10px;
    margin-right: 6px;
    border: 1px solid #d1d5db;
    background-color: #ffffff;
    border-radius: 4px;
    cursor: pointer;
}

.pub-btn:hover {
    background-color: #f3f4f6;
}

/* ===============================
   PROJECTS
   =============================== */

.project-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    font-size: 12.5px;
    padding: 6px 12px;
    border: 1px solid #111827;
    background-color: #ffffff;
    border-radius: 4px;
    cursor: pointer;
}

.filter-btn.active,
.filter-btn:hover {
    background-color: #111827;
    color: #ffffff;
}

.project-section-title {
    font-size: 26px;
    font-weight: 500;
    margin: 50px 0 25px;
    border-bottom: 1px solid #e5e7eb;
    padding-bottom: 10px;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.project-card {
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 22px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.04);
}

.project-card h3 {
    font-size: 17px;
    margin-bottom: 8px;
    font-weight: 600;
}

.project-card p {
    font-size: 14.5px;
    color: #4b5563;
    margin-bottom: 12px;
}

/* ===============================
   NEWS PAGE
   =============================== */

.news-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.news-date {
    font-weight: 600;
    color: #16a34a; /* green */
    font-size: 14.5px;
}

.news-item p {
    font-size: 15.5px;
    color: #374151;
}

.news-item a {
    margin-left: 4px;
}

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

.teaching-list {
    list-style: disc;
    padding-left: 20px;
}

.teaching-list li {
    margin-bottom: 10px;
    font-size: 15.5px;
    color: #059669; /* green */
}

.teaching-list li ul {
    list-style: circle;
    margin-top: 6px;
    margin-left: 20px;
}

.teaching-list a {
    color: #059669;
}

/* ===============================
   PEOPLE PAGE
   =============================== */

.people-section-title {
    font-size: 24px;
    font-weight: 500;
    margin: 40px 0 30px;
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 40px;
    justify-items: center;
}

.person-card {
    text-align: center;
}

.person-card img {
    width: 140px;
    height: 140px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 12px;
}

.person-card h3 {
    font-size: 15.5px;
    font-weight: 500;
    margin-bottom: 6px;
}

.socials a {
    color: #111827;
    font-size: 14px;
    margin: 0 6px;
}

.socials a:hover {
    color: #16a34a;
}

/* ===============================
   DATASETS PAGE
   =============================== */

.dataset-card {
    background-color: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 28px;
    margin-bottom: 30px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.04);
}

.dataset-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
}

.dataset-desc {
    font-size: 14.5px;
    color: #6b7280;
    margin-bottom: 16px;
}

.dataset-btn {
    display: inline-block;
    background-color: #3b82f6;
    color: #ffffff;
    font-size: 13px;
    font-weight: 600;
    padding: 10px 16px;
    border-radius: 4px;
    margin-bottom: 14px;
}

.dataset-btn:hover {
    background-color: #2563eb;
    text-decoration: none;
}

.hash {
    font-size: 13px;
    color: #6b7280;
    line-height: 1.6;
}

/* Navbar logo image */
.nav-logo {
    height: 38px;      /* adjust if needed */
    width: auto;
    display: block;
}



/* ===============================
   HEADINGS
   =============================== */
h1, h2, h3