:root {
    --primary: #0f172a;
    --secondary: #1e293b;
    --accent: #3b82f6;
    --accent-light: #60a5fa;
    --accent-dark: #1d4ed8;
    --accent-grad: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --bg: #0f172a;
    --card: #1e293b;
    --card-hover: #334155;
    --border: rgba(255,255,255,0.08);
    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 48px rgba(0,0,0,0.5);
    --radius: 16px;
    --radius-sm: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: 'Playfair Display', serif; font-weight: 600; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }

.container { width: 92%; max-width: 1200px; margin: 0 auto; padding: 0 15px; }

/* ========== HEADER (Home hero) ========== */
header {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--primary);
}

.header-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(59,130,246,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(139,92,246,0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(59,130,246,0.08) 0%, transparent 50%);
    z-index: 1;
}

.header-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 1;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.header-content {
    position: relative;
    z-index: 2;
    width: 100%;
    padding: 40px 20px;
    animation: fadeUp 1s ease-out;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-split {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 60px;
    max-width: 1100px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.hero-left { flex: 0 0 auto; display: flex; justify-content: center; }
.hero-right { flex: 1 1 400px; min-width: 300px; }

.profile-wrapper { position: relative; display: inline-block; }

.profile-ring {
    position: absolute;
    inset: -10px;
    border-radius: 50%;
    background: var(--accent-grad);
    opacity: 0.6;
    animation: pulse-ring 3s ease-in-out infinite;
}

@keyframes pulse-ring {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.05); opacity: 0.3; }
}

.profile-image {
    width: 260px;
    height: 260px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid rgba(255,255,255,0.1);
    position: relative;
    box-shadow: 0 0 50px rgba(59,130,246,0.25);
}

.profile-image img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.profile-image:hover img { transform: scale(1.05); }

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(59,130,246,0.15);
    border: 1px solid rgba(59,130,246,0.3);
    color: var(--accent-light);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

.header-text h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    color: var(--text);
    margin-bottom: 8px;
    letter-spacing: -1px;
    line-height: 1.2;
}

.header-text h2 {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    color: var(--accent-light);
    margin-bottom: 16px;
    font-family: 'Inter', sans-serif;
}

.institution {
    color: var(--text-muted);
    font-size: 1rem;
    max-width: 500px;
    margin-bottom: 32px;
    line-height: 1.6;
}

.header-stats { display: flex; gap: 32px; flex-wrap: wrap; }
.header-stat { text-align: left; }
.header-stat .num { font-size: 1.6rem; font-weight: 700; color: var(--text); display: block; line-height: 1; }
.header-stat .label { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.scroll-indicator i { color: var(--text-dim); font-size: 1.5rem; }

/* ========== NAVIGATION ==========
   Fixed bar, always visible on every page (fixes the old bug where the
   nav only appeared after scrolling 60% of the viewport height, which
   meant it could stay permanently hidden on short pages). */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

nav.scrolled { background: rgba(15, 23, 42, 0.97); box-shadow: var(--shadow); }

.nav-container { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; }

.nav-logo { font-family: 'Playfair Display', serif; font-size: 1.1rem; color: var(--text); text-decoration: none; font-weight: 600; }

.nav-links { display: flex; list-style: none; gap: 8px; }

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover, .nav-links a.active { color: var(--text); background: rgba(255,255,255,0.05); }

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--accent);
    border-radius: 50%;
}

.mobile-menu-btn { display: none; background: none; border: none; color: var(--text); font-size: 1.3rem; cursor: pointer; padding: 8px; }

/* ========== SECTIONS ========== */
section { padding: 60px 0; position: relative; }

.section-header { text-align: center; margin-bottom: 40px; }

.section-tag {
    display: inline-block;
    background: rgba(59,130,246,0.1);
    color: var(--accent-light);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-title { font-size: clamp(1.8rem, 4vw, 2.5rem); color: var(--text); margin-bottom: 12px; }
.section-subtitle { color: var(--text-muted); max-width: 600px; margin: 0 auto; font-size: 1rem; }

/* ========== PAGE HEADER (sub-pages) ========== */
.page-header {
    position: relative;
    padding: 150px 0 70px;
    text-align: center;
    overflow: hidden;
    background: var(--primary);
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(59,130,246,0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 60%, rgba(139,92,246,0.1) 0%, transparent 50%);
    z-index: 0;
}

.page-header .container { position: relative; z-index: 1; }

.page-header h1 { font-size: clamp(2rem, 4.5vw, 3rem); color: var(--text); margin-bottom: 12px; }
.page-header p { color: var(--text-muted); max-width: 640px; margin: 0 auto; font-size: 1rem; }

.breadcrumb {
    margin-top: 22px;
    font-size: 0.85rem;
    color: var(--text-dim);
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.breadcrumb a { color: var(--accent-light); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ========== ABOUT ========== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }

.about-text p { color: var(--text-muted); margin-bottom: 20px; font-size: 0.95rem; text-align: justify; }
.about-text p strong { color: var(--text); font-weight: 600; }
.about-text h3 { color: var(--text); font-size: 1.3rem; margin: 36px 0 18px; }

.membership-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.membership-list li { display: flex; align-items: flex-start; gap: 10px; color: var(--text-muted); font-size: 0.95rem; }
.membership-list li i { color: var(--accent-light); margin-top: 4px; }
.membership-list li strong { color: var(--text); font-weight: 600; }

.about-text p:first-child::first-letter {
    font-size: 3.5rem;
    float: left;
    line-height: 1;
    padding-right: 12px;
    color: var(--accent);
    font-family: 'Playfair Display', serif;
}

.contact-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    position: sticky;
    top: 100px;
}

.contact-card h3 { font-family: 'Inter', sans-serif; font-size: 1.1rem; margin-bottom: 24px; color: var(--text); }

.contact-item { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 18px; color: var(--text-muted); font-size: 0.9rem; }
.contact-item i { color: var(--accent); font-size: 1rem; margin-top: 3px; width: 20px; text-align: center; }
.contact-item a { color: var(--accent-light); text-decoration: none; transition: var(--transition); word-break: break-all; }
.contact-item a:hover { color: var(--text); text-decoration: underline; }

/* ========== HOME: UPDATES SLIDESHOW + NOTICES ========== */
.updates-notices-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 28px; align-items: stretch; }

.updates-slideshow {
    position: relative;
    height: 340px;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--card);
}

.slideshow-track { display: flex; height: 100%; transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1); }

.slide {
    flex: 0 0 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px;
    background:
        radial-gradient(ellipse at 30% 30%, rgba(59,130,246,0.18) 0%, transparent 55%),
        radial-gradient(ellipse at 70% 70%, rgba(139,92,246,0.14) 0%, transparent 55%);
}

.slide-icon {
    width: 68px; height: 68px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    background: rgba(59,130,246,0.12);
    color: var(--accent-light);
    font-size: 1.7rem;
    margin-bottom: 20px;
}

.slide h3 { color: var(--text); font-size: 1.3rem; margin-bottom: 10px; }
.slide p { color: var(--text-muted); font-size: 0.92rem; max-width: 380px; }

.slide-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 38px; height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: rgba(15,23,42,0.6);
    color: var(--text);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    z-index: 2;
}

.slide-arrow:hover { background: var(--accent); border-color: var(--accent); }
.slide-arrow.prev { left: 16px; }
.slide-arrow.next { right: 16px; }

.slide-dots { position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 2; }
.slide-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.25); border: none; cursor: pointer; padding: 0; transition: var(--transition); }
.slide-dot.active { background: var(--accent-light); width: 22px; border-radius: 4px; }

.notices-panel {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 26px;
    display: flex;
    flex-direction: column;
    height: 340px;
}

.notices-header h3 { display: flex; align-items: center; gap: 10px; font-family: 'Inter', sans-serif; font-size: 1rem; color: var(--text); margin-bottom: 16px; }
.notices-header h3 i { color: var(--accent-light); }

.notices-list { list-style: none; overflow-y: auto; flex: 1; padding-right: 6px; }
.notices-list li { padding: 12px 0; border-bottom: 1px solid var(--border); }
.notices-list li:last-child { border-bottom: none; }

.notice-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.notice-date { color: var(--text-dim); font-size: 0.78rem; display: flex; align-items: center; gap: 5px; }
.notice-text { display: block; color: var(--text-muted); font-size: 0.88rem; line-height: 1.5; }

.tag { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; padding: 2px 9px; border-radius: 50px; }
.tag-news { background: rgba(59,130,246,0.15); color: var(--accent-light); }
.tag-notice { background: rgba(245,158,11,0.15); color: #fbbf24; }

.notices-viewall {
    margin-top: 16px;
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-light);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
}
.notices-viewall:hover { color: var(--text); }

.notices-list::-webkit-scrollbar { width: 5px; }
.notices-list::-webkit-scrollbar-track { background: transparent; }
.notices-list::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }

/* ========== SUBJECTS ========== */
.subjects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.subject-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 32px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: block;
    text-decoration: none;
    height: 100%;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: var(--accent-grad);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.subject-card:hover { transform: translateY(-8px); border-color: rgba(59,130,246,0.3); box-shadow: var(--shadow-lg); }
.subject-card:hover::before { transform: scaleX(1); }

.subject-icon {
    width: 48px; height: 48px;
    background: rgba(59,130,246,0.1);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px;
    color: var(--accent);
    font-size: 1.3rem;
}

.subject-card h3 { font-family: 'Inter', sans-serif; font-size: 1.1rem; margin-bottom: 10px; color: var(--text); }
.subject-card p { color: var(--text-dim); font-size: 0.88rem; line-height: 1.6; }

.subject-card .subject-link-cta {
    margin-top: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-light);
    font-size: 0.85rem;
    font-weight: 600;
}

.subject-card:hover .subject-link-cta { color: var(--text); }

/* ========== RESOURCE TABS (subject sub-pages) ========== */
.resource-tabs-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 40px;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 12px 22px;
    border-radius: 50px;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover { color: var(--text); border-color: rgba(59,130,246,0.3); }
.tab-btn.active { background: var(--accent-grad); color: #fff; border-color: transparent; }

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeUp 0.5s ease-out; }

.resource-list { list-style: none; display: flex; flex-direction: column; gap: 14px; max-width: 800px; margin: 0 auto; }

.resource-item {
    display: flex;
    align-items: center;
    gap: 18px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px 24px;
    transition: var(--transition);
}

.resource-item:hover { border-color: rgba(59,130,246,0.3); transform: translateX(4px); }

.resource-item .resource-icon {
    width: 42px; height: 42px;
    flex: none;
    background: rgba(59,130,246,0.1);
    color: var(--accent);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.05rem;
}

.resource-item .resource-info { flex: 1; min-width: 0; }
.resource-item .resource-info h4 { font-family: 'Inter', sans-serif; font-size: 0.95rem; color: var(--text); margin-bottom: 4px; }
.resource-item .resource-info span { color: var(--text-dim); font-size: 0.8rem; }

.resource-item .resource-download {
    flex: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(59,130,246,0.1);
    color: var(--accent-light);
    border: 1px solid rgba(59,130,246,0.25);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
}

.resource-item .resource-download:hover { background: var(--accent-grad); color: #fff; border-color: transparent; }

.resource-note {
    max-width: 800px;
    margin: 0 auto 28px;
    background: rgba(59,130,246,0.06);
    border: 1px dashed rgba(59,130,246,0.3);
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    text-align: center;
}

/* ========== RESEARCH ========== */
.research-hero { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 48px; margin-bottom: 48px; text-align: center; }
.research-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

.stat-box { padding: 24px; background: rgba(255,255,255,0.03); border-radius: var(--radius-sm); border: 1px solid var(--border); transition: var(--transition); }
.stat-box:hover { background: rgba(255,255,255,0.05); transform: translateY(-4px); }

.stat-number {
    font-size: 2.5rem; font-weight: 700;
    background: var(--accent-grad);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    line-height: 1; margin-bottom: 8px;
}

.stat-label { font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }

.interests-section { margin: 48px 0; }
.interests-section h3 { font-family: 'Inter', sans-serif; font-size: 1.2rem; margin-bottom: 24px; text-align: center; color: var(--text); }
.research-interests { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }

.interest-tag {
    background: rgba(59,130,246,0.08);
    border: 1px solid rgba(59,130,246,0.2);
    color: var(--accent-light);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    cursor: default;
}

.interest-tag:hover { background: rgba(59,130,246,0.15); transform: translateY(-2px); }

.pub-section { margin-top: 60px; }
.pub-section h3 { font-family: 'Inter', sans-serif; font-size: 1.3rem; margin-bottom: 32px; padding-bottom: 12px; border-bottom: 1px solid var(--border); color: var(--text); }
.pub-list { list-style: none; }

.pub-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 24px 28px;
    margin-bottom: 16px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.pub-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0; width: 3px;
    background: var(--accent-grad);
    opacity: 0;
    transition: var(--transition);
}

.pub-item:hover { border-color: rgba(59,130,246,0.2); transform: translateX(4px); }
.pub-item:hover::before { opacity: 1; }
.pub-item strong { color: var(--text); }
.pub-item em { color: var(--accent-light); font-style: normal; }
.pub-item a { color: var(--accent-light); text-decoration: none; font-size: 0.85rem; word-break: break-all; }
.pub-item a:hover { text-decoration: underline; }

/* ========== PROJECTS ========== */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.project-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; transition: var(--transition); position: relative; overflow: hidden; }

.project-card::after {
    content: '';
    position: absolute;
    top: 0; right: 0; width: 100px; height: 100px;
    background: radial-gradient(circle, rgba(59,130,246,0.1) 0%, transparent 70%);
    pointer-events: none;
}

.project-card:hover { border-color: rgba(59,130,246,0.3); transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.project-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; }
.project-card h3 { font-family: 'Inter', sans-serif; font-size: 1.1rem; color: var(--text); line-height: 1.4; flex: 1; padding-right: 16px; }

.project-year { background: rgba(59,130,246,0.1); color: var(--accent-light); padding: 4px 12px; border-radius: 50px; font-size: 0.75rem; font-weight: 600; white-space: nowrap; }

.project-meta { display: flex; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.project-meta span { display: flex; align-items: center; gap: 6px; color: var(--text-dim); font-size: 0.85rem; }
.project-meta i { color: var(--accent); font-size: 0.8rem; }

.project-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; text-align: justify; }

.project-award {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(234,179,8,0.1);
    color: #eab308;
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-top: 16px;
}

/* ========== EXPERIENCE ========== */
.timeline { position: relative; max-width: 800px; margin: 0 auto; }

.timeline::before {
    content: '';
    position: absolute;
    left: 50%; transform: translateX(-50%);
    top: 0; bottom: 0; width: 2px;
    background: linear-gradient(to bottom, var(--accent), transparent);
}

.timeline-item { position: relative; width: 50%; padding: 0 40px 60px 0; text-align: right; }
.timeline-item:nth-child(even) { margin-left: 50%; padding: 0 0 60px 40px; text-align: left; }

.timeline-dot {
    position: absolute;
    right: -8px; top: 8px;
    width: 16px; height: 16px;
    background: var(--accent);
    border-radius: 50%;
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.3);
}

.timeline-item:nth-child(even) .timeline-dot { right: auto; left: -8px; }

.timeline-date {
    display: inline-block;
    background: var(--accent-grad);
    color: white;
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.timeline-content { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 24px; transition: var(--transition); }
.timeline-content:hover { border-color: rgba(59,130,246,0.3); transform: translateY(-4px); box-shadow: var(--shadow); }
.timeline-content h3 { font-family: 'Inter', sans-serif; font-size: 1.1rem; color: var(--text); margin-bottom: 6px; }
.timeline-content .org { color: var(--accent-light); font-size: 0.9rem; font-weight: 500; margin-bottom: 10px; }
.timeline-content p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; }

/* ========== ADDITIONAL / ACTIVITIES ========== */
.cards-container { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: var(--transition); }
.card:hover { transform: translateY(-8px); border-color: rgba(59,130,246,0.3); box-shadow: var(--shadow-lg); }

.card-icon { height: 100px; display: flex; align-items: center; justify-content: center; font-size: 2.5rem; color: white; position: relative; overflow: hidden; }
.card-icon::before { content: ''; position: absolute; inset: 0; background: var(--accent-grad); opacity: 0.9; }
.card-icon i { position: relative; z-index: 1; }

.card-content { padding: 28px; }
.card-content h3 { font-family: 'Inter', sans-serif; font-size: 1.1rem; margin-bottom: 12px; color: var(--text); }
.card-content p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; text-align: justify; }

/* ========== HOME QUICK LINKS ========== */
.quicklinks-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ========== FOOTER ========== */
footer { background: var(--secondary); border-top: 1px solid var(--border); padding: 80px 0 30px; position: relative; }
.footer-content { text-align: center; }
.footer-name { font-family: 'Playfair Display', serif; font-size: 1.5rem; color: var(--text); margin-bottom: 8px; }
.footer-title { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 40px; }

.academic-profiles { display: flex; justify-content: center; gap: 16px; margin-bottom: 50px; }

.profile-link {
    width: 52px; height: 52px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.profile-link::before { content: ''; position: absolute; inset: 0; background: var(--accent-grad); opacity: 0; transition: var(--transition); }
.profile-link:hover { color: white; border-color: transparent; transform: translateY(-4px); }
.profile-link:hover::before { opacity: 1; }
.profile-link i { position: relative; z-index: 1; }

/* brand colors for each social/academic icon */
.profile-google i { color: #4285F4; }
.profile-researchgate i { color: #00CCBB; }
.profile-linkedin i { color: #0A66C2; }
.profile-orcid i { color: #A6CE39; }
.profile-academia i { color: #14B8A6; }
.profile-wos i { color: #F59E0B; }
.profile-faculty i { color: #8B5CF6; }
.profile-whatsapp i { color: #25D366; }
.profile-instagram i {
    background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.profile-link:hover i {
    color: white;
    background: none;
    -webkit-background-clip: initial;
    background-clip: initial;
    -webkit-text-fill-color: white;
}

.visitor-counter { display: flex; justify-content: center; align-items: center; gap: 10px; margin-bottom: 30px; }
.visitor-counter img { border-radius: 6px; }
.visitor-label { color: var(--text-muted); font-size: 0.9rem; font-family: 'Inter', sans-serif; }

.portal-card { max-width: 560px; margin: 0 auto; text-align: center; }
.portal-card .card-content { display: flex; flex-direction: column; align-items: center; }
.portal-card .btn-submit { text-decoration: none; }

.copyright { color: var(--text-dim); font-size: 0.85rem; padding-top: 30px; border-top: 1px solid var(--border); }
.copyright p { margin-bottom: 6px; }

/* ========== ANIMATIONS ========== */
.reveal { opacity: 0; transform: translateY(40px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.active { opacity: 1; transform: translateY(0); }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .subjects-grid { grid-template-columns: repeat(2, 1fr); }
    .cards-container { grid-template-columns: repeat(2, 1fr); }
    .quicklinks-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    section { padding: 40px 0; }
    .page-header { padding: 120px 0 50px; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .subjects-grid { grid-template-columns: 1fr; }
    .updates-notices-grid { grid-template-columns: 1fr; }
    .updates-slideshow, .notices-panel { height: 300px; }
    .projects-grid { grid-template-columns: 1fr; }
    .cards-container { grid-template-columns: 1fr; }
    .quicklinks-grid { grid-template-columns: 1fr; }
    .research-stats { grid-template-columns: repeat(2, 1fr); }

    .hero-split { flex-direction: column; gap: 40px; text-align: center; }
    .hero-right { text-align: center; }
    .header-stats { justify-content: center; }
    .header-stat { text-align: center; }
    .profile-image { width: 200px; height: 200px; }

    .timeline::before { left: 20px; }
    .timeline-item { width: 100%; padding-left: 50px; padding-right: 0; text-align: left; }
    .timeline-item:nth-child(even) { margin-left: 0; padding-left: 50px; text-align: left; }
    .timeline-dot { right: auto; left: 12px !important; }

    .nav-links {
        position: fixed;
        top: 60px; left: 0; right: 0;
        background: var(--secondary);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }

    .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: all; }
    .nav-links a { padding: 12px 16px; width: 100%; }
    .nav-links a.active::after { display: none; }
    .mobile-menu-btn { display: block; }
    .nav-logo { display: block; }
    .resource-item { flex-wrap: wrap; }
}

/* ========== CONTACT FORM ========== */
#contact { background: var(--primary); }

.contact-form-wrapper { max-width: 720px; margin: 0 auto; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 0.85rem; font-weight: 500; color: var(--text-muted); letter-spacing: 0.3px; }

.form-group input, .form-group textarea, .form-group select {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
    width: 100%;
}

.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-dim); }
.form-group textarea { resize: vertical; min-height: 140px; }
.form-group select option { background: var(--secondary); }

.btn-submit {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--accent-grad);
    color: white;
    border: none;
    padding: 14px 36px;
    border-radius: 50px;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
}

.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(59,130,246,0.4); }
.btn-submit:active { transform: translateY(0); }

.form-status { display: none; margin-top: 20px; padding: 14px 20px; border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 500; text-align: center; }
.form-status.success { display: block; background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.3); color: #4ade80; }
.form-status.error { display: block; background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3); color: #f87171; }

@media (max-width: 600px) {
    .form-grid { grid-template-columns: 1fr; }
    .form-group.full { grid-column: 1; }
}

@media (max-width: 480px) {
    .header-stats { gap: 24px; }
    .header-stat .num { font-size: 1.4rem; }
    .profile-image { width: 160px; height: 160px; }
    .research-hero { padding: 32px 20px; }
    .stat-number { font-size: 2rem; }
    .project-card { padding: 24px; }
    .contact-card { padding: 24px; }
}