/* ==========================================================================
   Modern Academic & AI Research Portfolio Stylesheet
   Designed for Proma Hossain Progga (promaprogga.github.io)
   ========================================================================== */

:root {
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --accent-primary: #2563eb;
  --accent-primary-dark: #1d4ed8;
  --accent-secondary: #4f46e5;
  --accent-light: #eff6ff;
  --accent-border: #bfdbfe;
  --border-subtle: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px -4px rgba(15, 23, 42, 0.1), 0 4px 10px -2px rgba(15, 23, 42, 0.05);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

/* Global Typography & Base Overrides */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
  background-color: var(--bg-body) !important;
  color: var(--text-secondary) !important;
  line-height: 1.65 !important;
  font-size: 15.5px !important;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif !important;
  color: var(--text-primary) !important;
  letter-spacing: -0.02em;
}

/* Masthead / Navigation Bar */
.masthead {
  background: rgba(255, 255, 255, 0.88) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle) !important;
  box-shadow: 0 1px 10px rgba(15, 23, 42, 0.03);
}

.masthead__inner-wrap {
  padding: 0.65em 1em !important;
  font-family: 'Plus Jakarta Sans', 'Inter', sans-serif !important;
}

.greedy-nav {
  background: transparent !important;
}

.greedy-nav a {
  color: var(--text-secondary) !important;
  font-weight: 500 !important;
  font-size: 0.92rem !important;
  transition: color 0.2s ease !important;
}

.greedy-nav a:hover {
  color: var(--accent-primary) !important;
}

.masthead__menu-item--lg a {
  color: var(--text-primary) !important;
  font-weight: 700 !important;
  font-size: 1.02rem !important;
}

.greedy-nav .visible-links a:before {
  background: var(--accent-primary) !important;
  height: 2px !important;
}

/* Main Container & Sidebar Layout */
#main {
  margin-top: 2rem !important;
  margin-bottom: 4rem !important;
}

@media (min-width: 925px) {
  .sidebar {
    position: sticky !important;
    top: 5.2rem !important;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.15rem !important;
    box-shadow: var(--shadow-md);
  }
}

.author__avatar img {
  max-width: 155px !important;
  border-radius: 50% !important;
  border: 3px solid #ffffff !important;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.16) !important;
  padding: 0 !important;
  transition: transform 0.3s ease;
}

.author__avatar img:hover {
  transform: scale(1.03);
}

.sidebar .author__name {
  font-family: 'Plus Jakarta Sans', sans-serif !important;
  font-size: 1.22rem !important;
  font-weight: 700 !important;
  color: var(--text-primary) !important;
  margin-top: 0.85rem !important;
  margin-bottom: 0.35rem !important;
  line-height: 1.3 !important;
}

.author__bio {
  font-size: 0.85rem !important;
  color: var(--accent-primary) !important;
  font-weight: 600 !important;
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  margin-top: 0.4rem !important;
  margin-bottom: 1rem !important;
  line-height: 1.35 !important;
  display: inline-block;
}

.author__urls {
  font-size: 0.88rem !important;
}

.author__urls li {
  white-space: normal !important;
  margin-bottom: 0.45rem !important;
  color: var(--text-secondary);
  line-height: 1.35 !important;
}

.author__urls li a {
  font-size: 0.88rem !important;
  color: var(--text-secondary) !important;
  padding: 0.25rem 0.4rem !important;
  border-radius: 6px;
  transition: all 0.18s ease;
  margin-bottom: 0 !important;
}

.author__urls li a:hover {
  color: var(--accent-primary) !important;
  background: var(--accent-light);
  text-decoration: none !important;
}

.author__urls i {
  color: var(--accent-primary);
  margin-right: 4px;
}

/* Section Headers */
.page__content h1 {
  font-size: 1.45rem !important;
  font-weight: 700 !important;
  color: var(--text-primary) !important;
  margin-top: 2.6rem !important;
  margin-bottom: 1.2rem !important;
  padding-bottom: 0.6rem !important;
  border-bottom: 2px solid var(--border-subtle) !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
}

.page__content h1::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.page__content a {
  color: var(--accent-primary);
  text-decoration: none !important;
  font-weight: 500;
  transition: color 0.15s ease;
}

.page__content a:hover {
  color: var(--accent-primary-dark);
  text-decoration: underline !important;
}

/* Hero Bio Section */
.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top: 4px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
}

.hero-greeting {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 0.35rem 0;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.hero-subtitle {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin: 0 0 1rem 0;
}

.hero-bio-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.15rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--border-subtle);
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.48rem 0.95rem;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none !important;
  transition: all 0.2s ease;
  border: 1px solid var(--border-subtle);
  background: var(--bg-subtle);
  color: var(--text-primary) !important;
}

.hero-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  border-color: var(--accent-border);
  background: var(--accent-light);
  color: var(--accent-primary) !important;
  text-decoration: none !important;
}

.hero-btn--primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #ffffff !important;
  border-color: transparent;
}

.hero-btn--primary:hover {
  background: linear-gradient(135deg, var(--accent-primary-dark), var(--accent-primary));
  color: #ffffff !important;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.28);
}

/* Impact Metrics Banner */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  gap: 0.9rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.metric-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.metric-value {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.2;
  margin-bottom: 0.2rem;
}

.metric-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.35;
}

/* Research Interests Pills */
.interests-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.4rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.interests-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 0.75rem 0;
}

.interest-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.interest-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  background: var(--accent-light);
  color: var(--accent-primary-dark);
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.interest-pill:hover {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

/* Publications Section */
.pub-subhead {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 1.5rem 0 0.85rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.paper-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle) !important;
  border-radius: var(--radius-md);
  padding: 1.35rem !important;
  margin-bottom: 1.1rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  align-items: center;
  gap: 1.35rem;
  flex-wrap: nowrap;
}

.paper-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-border) !important;
}

.paper-box .paper-box-image {
  flex: 0 0 230px;
  max-width: 230px !important;
  min-width: 190px !important;
  position: relative;
  order: 1 !important;
}

.paper-box .paper-box-image > div {
  width: 100%;
  background: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.paper-box .paper-box-image img {
  width: 100% !important;
  max-width: 100% !important;
  height: auto !important;
  max-height: 135px;
  object-fit: contain !important;
  box-shadow: none !important;
  border-radius: 4px;
  transition: transform 0.3s ease;
}

.paper-box:hover .paper-box-image img {
  transform: scale(1.03);
}

.paper-box .paper-box-text {
  flex: 1 1 auto;
  max-width: none !important;
  padding-left: 0 !important;
  order: 2 !important;
}

@media (max-width: 767px) {
  .paper-box {
    flex-direction: column;
    align-items: stretch;
  }
  .paper-box .paper-box-image {
    flex: 1 1 auto;
    max-width: 100% !important;
  }
}

.badge {
  position: absolute !important;
  top: 0.45rem;
  left: 0.45rem;
  margin: 0 !important;
  padding: 0.2rem 0.65rem !important;
  background: linear-gradient(135deg, #1e40af, #3b82f6) !important;
  color: #ffffff !important;
  font-size: 0.72rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.03em;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(30, 64, 175, 0.3);
  z-index: 2;
}

.badge--review {
  background: linear-gradient(135deg, #b45309, #d97706) !important;
}

.paper-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 0.35rem;
}

.paper-authors {
  font-size: 0.89rem;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
  line-height: 1.5;
}

.paper-authors strong {
  color: var(--accent-primary-dark);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.paper-venue {
  font-size: 0.86rem;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.paper-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.pub-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-primary) !important;
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  text-decoration: none !important;
  transition: all 0.18s ease;
}

.pub-btn:hover {
  background: var(--accent-primary);
  color: #ffffff !important;
  border-color: var(--accent-primary);
  text-decoration: none !important;
}

/* Timeline for Experience & Education */
.timeline {
  position: relative;
  padding-left: 1.5rem;
  margin: 1rem 0 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0.35rem;
  bottom: 0.35rem;
  left: 0.35rem;
  width: 2px;
  background: var(--border-subtle);
}

.timeline-item {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.35rem;
  margin-bottom: 0.95rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.timeline-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.52rem;
  top: 1.35rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px var(--accent-border);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.timeline-role {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.timeline-org {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 0.45rem;
}

.timeline-date {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  white-space: nowrap;
}

.timeline-date--active {
  background: #dcfce7;
  color: #15803d;
  border-color: #bbf7d0;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

.course-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.55rem;
}

.course-tag {
  font-size: 0.78rem;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
}

/* Selected Projects Filter & Grid */
.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.filter-btn {
  padding: 0.42rem 0.95rem;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 600;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.18s ease;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.1rem;
  margin-bottom: 2rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.project-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-border);
}

.project-card-top {
  margin-bottom: 0.85rem;
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.project-cat {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
}

.project-cat--research {
  background: #f3e8ff;
  color: #6b21a8;
  border: 1px solid #e9d5ff;
}

.project-cat--industry {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

.project-cat--academic {
  background: #ccfbf1;
  color: #115e59;
  border: 1px solid #99f6e4;
}

.project-impact {
  font-size: 0.74rem;
  font-weight: 700;
  color: #0f766e;
  background: #f0fdfa;
  border: 1px solid #ccfbf1;
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
}

.project-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.45rem 0;
  line-height: 1.35;
}

.project-desc {
  font-size: 0.87rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0;
}

.project-desc ul {
  margin: 0.35rem 0 0 0;
  padding-left: 1.15rem;
}

.project-desc li {
  font-size: 0.85rem !important;
  margin-bottom: 0.25rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-subtle);
}

.project-tag {
  font-size: 0.73rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

/* Skills Matrix */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(265px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-sm);
}

.skill-card-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.7rem 0;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.skill-card-title i {
  color: var(--accent-primary);
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-chip {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 0.22rem 0.6rem;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.skill-chip:hover {
  background: var(--accent-light);
  color: var(--accent-primary-dark);
  border-color: var(--accent-border);
}

/* Awards, Certifications & Leadership Grid */
.awards-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.award-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.95rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  transition: transform 0.2s ease;
}

.award-item:hover {
  transform: translateX(3px);
  border-color: var(--accent-border);
}

.award-main {
  flex: 1;
}

.award-title {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}

.award-org {
  font-size: 0.86rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.award-detail {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.award-year {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-primary-dark);
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}

.two-col-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.1rem;
  margin-bottom: 2rem;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.35rem;
  box-shadow: var(--shadow-sm);
}

.info-card h3 {
  font-size: 1rem !important;
  font-weight: 700 !important;
  margin: 0 0 0.8rem 0 !important;
  color: var(--text-primary) !important;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.info-list li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.65rem;
  font-size: 0.88rem !important;
  line-height: 1.5;
}

.info-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
}