/* ================================================================
   Mst Shapna Akter — Premium Academic Portfolio
   Design: Inter (body) + Playfair Display (headings)
   Palette: Deep navy #0f1b2d, Teal accent #0d7377, Warm off-white #fafaf8
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,600;0,700;1,500&display=swap');

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: #fafaf8;
    color: #1e1e2e;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

a { color: #0d7377; text-decoration: none; transition: color 0.2s; }
a:hover { color: #0a5a5d; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Top Navigation ---------- */
.topnav {
    background: #0f1b2d;
    position: sticky; top: 0; z-index: 1000;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 48px; height: 58px;
    box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

.topnav .brand {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1.1rem; font-weight: 700;
    color: #e8e4d9; letter-spacing: 0.2px; white-space: nowrap;
}

.topnav nav { display: flex; gap: 2px; align-items: center; }

.topnav nav a {
    font-size: 0.82rem; font-weight: 500; letter-spacing: 0.4px;
    text-transform: uppercase; color: #a8b2c0;
    padding: 6px 14px; border-radius: 4px;
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
}

.topnav nav a:hover { background: rgba(255,255,255,0.07); color: #e8e4d9; text-decoration: none; }
.topnav nav a.active { color: #4ecdc4; background: rgba(78,205,196,0.1); }

/* ---------- Page Wrapper ---------- */
.page-wrapper { max-width: 860px; margin: 0 auto; padding: 56px 32px 100px; }

/* ---------- Hero Section ---------- */
.hero {
    padding-bottom: 44px;
    border-bottom: 1px solid #e2ddd6;
    margin-bottom: 52px;
}

.hero h1 {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 2.6rem; font-weight: 700; color: #0f1b2d;
    line-height: 1.2; margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.hero .subtitle {
    font-size: 1rem; color: #5a6478; font-weight: 400;
    margin-bottom: 22px; line-height: 1.5;
}

.hero-meta { list-style: none; margin-bottom: 24px; }
.hero-meta li {
    font-size: 0.9rem; color: #4a5568; padding: 3px 0;
    display: flex; align-items: baseline; gap: 10px;
}
.hero-meta li::before {
    content: '';
    display: inline-block;
    width: 5px; height: 5px;
    border-radius: 50%; background: #0d7377;
    flex-shrink: 0; margin-top: 7px;
}

.hero-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 4px; }

.btn-link {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 7px 18px; border-radius: 3px; font-size: 0.82rem;
    font-weight: 600; letter-spacing: 0.3px;
    border: 1.5px solid #0d7377; color: #0d7377;
    background: transparent; transition: all 0.2s;
    text-transform: uppercase;
}
.btn-link:hover {
    background: #0d7377; color: #fff; text-decoration: none;
}

/* ---------- Announcement Banner ---------- */
.notice-box {
    background: #f0faf9;
    border-left: 3px solid #0d7377;
    padding: 13px 20px; margin-bottom: 52px;
    font-size: 0.9rem; color: #2d4a4a; line-height: 1.65;
    border-radius: 0 4px 4px 0;
}
.notice-box a { font-weight: 600; }

/* ---------- Sections ---------- */
.section { margin-bottom: 52px; }

.section-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-size: 1.45rem; font-weight: 700; color: #0f1b2d;
    margin-bottom: 18px; padding-bottom: 10px;
    border-bottom: 2px solid #0f1b2d;
    letter-spacing: -0.2px;
}

.section p {
    font-size: 0.95rem; color: #2d3748; line-height: 1.85;
    margin-bottom: 14px;
}

/* ---------- Research Interest Tags ---------- */
.interest-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.interest-tag {
    background: transparent;
    color: #0f1b2d;
    border: 1px solid #b0bac8;
    border-radius: 2px;
    padding: 4px 14px;
    font-size: 0.82rem; font-weight: 500;
    letter-spacing: 0.2px;
    transition: all 0.2s;
}
.interest-tag:hover { border-color: #0d7377; color: #0d7377; }

/* ---------- News ---------- */
.news-list { list-style: none; }
.news-list li {
    display: grid; grid-template-columns: 110px 1fr;
    gap: 16px; padding: 10px 0;
    border-bottom: 1px solid #ede9e2;
    font-size: 0.9rem; align-items: baseline;
    line-height: 1.65;
}
.news-list li:last-child { border-bottom: none; }
.news-date {
    font-size: 0.78rem; font-weight: 600; color: #0d7377;
    text-transform: uppercase; letter-spacing: 0.5px;
    padding-top: 2px;
}
.news-text { color: #2d3748; }
.news-highlight { font-weight: 700; color: #0f1b2d; }

/* ---------- Publications ---------- */
.pub-section-title {
    font-size: 0.78rem; font-weight: 700; letter-spacing: 1px;
    text-transform: uppercase; color: #0d7377;
    border-bottom: 1px solid #d0ccc5;
    padding-bottom: 6px; margin: 28px 0 14px;
}

.pub-list { list-style: none; }
.pub-list li {
    padding: 11px 0 11px 20px;
    border-bottom: 1px solid #ede9e2;
    font-size: 0.9rem; color: #2d3748;
    line-height: 1.75; position: relative;
}
.pub-list li::before {
    content: '';
    position: absolute; left: 0; top: 20px;
    width: 4px; height: 4px;
    border-radius: 50%; background: #0d7377;
}
.pub-list li:last-child { border-bottom: none; }
.pub-list li em { color: #5a6478; font-style: italic; }
.pub-list strong { color: #0f1b2d; }

.pub-badge {
    display: inline-block; font-size: 0.7rem; font-weight: 700;
    background: #fff8e1; color: #8a6d00;
    border: 1px solid #e6c84a;
    border-radius: 2px; padding: 1px 6px;
    margin-left: 5px; vertical-align: middle;
    letter-spacing: 0.3px;
}

/* ---------- Teaching / Service ---------- */
.content-list { list-style: none; }
.content-list li {
    padding: 9px 0 9px 20px;
    border-bottom: 1px solid #ede9e2;
    font-size: 0.9rem; color: #2d3748;
    line-height: 1.7; position: relative;
}
.content-list li::before {
    content: '';
    position: absolute; left: 0; top: 18px;
    width: 4px; height: 4px;
    border-radius: 50%; background: #0d7377;
}
.content-list li:last-child { border-bottom: none; }

.subsection-title {
    font-size: 0.78rem; font-weight: 700; letter-spacing: 1px;
    text-transform: uppercase; color: #0d7377;
    margin: 24px 0 10px;
    border-bottom: 1px solid #d0ccc5; padding-bottom: 5px;
}

/* ---------- Grant Card ---------- */
.grant-card {
    border-left: 3px solid #0d7377;
    padding: 14px 20px; margin-bottom: 16px;
    background: #f7fafa;
    font-size: 0.9rem; line-height: 1.75; color: #2d3748;
}
.grant-badge {
    display: inline-block; background: #0d7377; color: #fff;
    font-size: 0.72rem; font-weight: 700; letter-spacing: 0.5px;
    text-transform: uppercase; border-radius: 2px;
    padding: 2px 8px; margin-bottom: 8px;
}

/* ---------- Opening Card ---------- */
.opening-card {
    border-left: 3px solid #0d7377;
    padding: 20px 24px; background: #f7fafa;
    font-size: 0.95rem; line-height: 1.9; color: #2d3748;
}
.opening-card p { margin-bottom: 12px; }
.opening-card p:last-child { margin-bottom: 0; }

/* ---------- Footer ---------- */
.site-footer {
    background: #0f1b2d; color: #7a8a9a;
    text-align: center; padding: 22px 24px;
    font-size: 0.8rem; letter-spacing: 0.3px;
    margin-top: 60px;
}
.site-footer a { color: #4ecdc4; }
.site-footer a:hover { color: #7eddd9; text-decoration: none; }

/* ---------- Responsive ---------- */
@media (max-width: 700px) {
    .topnav { padding: 10px 16px; flex-wrap: wrap; height: auto; gap: 8px; }
    .page-wrapper { padding: 32px 18px 60px; }
    .hero h1 { font-size: 1.9rem; }
    .news-list li { grid-template-columns: 1fr; gap: 4px; }
    .news-date { font-size: 0.75rem; }
}