/* ===================================================================
   HUMZA TAREEN — SHARED DESIGN SYSTEM
   Shared across Engineering Portfolio (index.html) & Research Profile (research.html)
   =================================================================== */

/* ===== RESET & BASE ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: 'Inter', sans-serif;
  background-color: #0a192f;
  color: #8892b0;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: #64ffda; text-decoration: none; transition: all 0.3s cubic-bezier(0.645,0.045,0.355,1); }
a:hover { color: #64ffda; }
ul { list-style: none; }
img { max-width: 100%; }
::selection { background: rgba(100,255,218,0.2); color: #e6f1ff; }

/* ===== ACCESSIBILITY ===== */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  background: var(--accent);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 16px;
  outline: 2px solid var(--heading);
  outline-offset: 2px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto; }
  .fade-in { opacity: 1; transform: none; }
}

/* ===== CSS VARIABLES ===== */
:root {
  --bg: #0a192f;
  --bg-light: #112240;
  --bg-lighter: #1d3461;
  --text: #8892b0;
  --text-light: #ccd6f6;
  --heading: #e6f1ff;
  --accent: #64ffda;
  --accent-muted: rgba(100, 255, 218, 0.15);
  --card-bg: rgba(17, 34, 64, 0.85);
  --card-border: rgba(100, 255, 218, 0.1);
  --card-border-hover: rgba(100, 255, 218, 0.3);
  --transition: all 0.3s cubic-bezier(0.645,0.045,0.355,1);
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 1100px;
  --nav-height: 70px;
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 50px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
  background: transparent;
}
.nav.scrolled {
  background: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px -10px rgba(2,12,27,0.7);
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-light);
  position: relative;
}
.nav-links a:hover { color: var(--accent); }
.nav-links a .nav-number {
  color: var(--accent);
  margin-right: 4px;
}
.nav-cta {
  font-family: var(--font-mono) !important;
  font-size: 13px !important;
  color: var(--accent) !important;
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 10px 16px;
}
.nav-cta:hover {
  background: rgba(100,255,218,0.1);
}

/* Page Switcher in Nav */
.page-switcher {
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(100,255,218,0.05);
  border: 1px solid rgba(100,255,218,0.15);
  border-radius: 6px;
  padding: 3px;
  margin-right: 8px;
}
.page-switcher a {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text);
  padding: 6px 14px;
  border-radius: 4px;
  transition: var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.page-switcher a:hover {
  color: var(--accent);
  background: rgba(100,255,218,0.08);
}
.page-switcher a.active-page {
  color: var(--bg);
  background: var(--accent);
  font-weight: 600;
}
.page-switcher a.active-page:hover {
  color: var(--bg);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
}
.hamburger span {
  width: 28px;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
  display: block;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  width: 75%;
  max-width: 400px;
  height: 100vh;
  background: var(--bg-light);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu a {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-light);
}
.mobile-menu a:hover { color: var(--accent); }
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(10,25,47,0.7);
  z-index: 998;
}
.mobile-overlay.open { display: block; }

/* Mobile page switcher */
.mobile-page-switcher {
  display: flex;
  gap: 0;
  background: rgba(100,255,218,0.05);
  border: 1px solid rgba(100,255,218,0.15);
  border-radius: 6px;
  padding: 3px;
  margin-bottom: 10px;
}
.mobile-page-switcher a {
  font-size: 13px;
  padding: 8px 18px;
  border-radius: 4px;
  transition: var(--transition);
}
.mobile-page-switcher a.active-page {
  color: var(--bg);
  background: var(--accent);
  font-weight: 600;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  padding: 0 50px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.hero-content {
  flex: 1;
  min-width: 0;
}
.hero-image {
  flex-shrink: 0;
  position: relative;
}
.hero-image img {
  width: 280px;
  height: 280px;
  border-radius: 12px;
  object-fit: cover;
  object-position: center top;
  border: 2px solid var(--accent);
  transition: var(--transition);
}
.hero-image img:hover {
  transform: translate(-4px, -4px);
}
.hero-image::after {
  content: '';
  position: absolute;
  top: 14px;
  left: 14px;
  width: 280px;
  height: 280px;
  border: 2px solid var(--accent);
  border-radius: 12px;
  z-index: -1;
  transition: var(--transition);
}
.hero-image:hover::after {
  top: 10px;
  left: 10px;
}
.hero-intro {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-name {
  font-size: clamp(40px, 8vw, 72px);
  font-weight: 700;
  color: var(--heading);
  line-height: 1.1;
  margin-bottom: 10px;
}
.hero-tagline {
  font-size: clamp(30px, 5vw, 56px);
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 20px;
}
.hero-description {
  max-width: 540px;
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 30px;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.btn-primary {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 14px 28px;
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}
.btn-primary:hover {
  background: rgba(100,255,218,0.1);
}
.btn-ghost {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-light);
  border: 1px solid var(--text);
  border-radius: 4px;
  padding: 14px 28px;
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.trust-strip {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.trust-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: rgba(100,255,218,0.08);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(100,255,218,0.15);
}

/* ===== SECTION COMMON ===== */
.section {
  padding: 100px 50px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
}
.section-number {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--accent);
}
.section-title {
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  color: var(--heading);
}
.section-line {
  flex: 1;
  height: 1px;
  background: #233554;
  margin-left: 20px;
}

/* ===== METRICS BANNER ===== */
.metrics {
  background: var(--bg-light);
  padding: 60px 50px;
}
.metrics-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.metric-card {
  text-align: center;
  padding: 30px 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.metric-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-3px);
}
.metric-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}
.metric-label {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.5;
}

/* ===== ABOUT ===== */
.about-layout {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}
.about-content {
  flex: 1;
  min-width: 0;
}
.about-text {
  max-width: 700px;
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 20px;
}
.about-details {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 40px;
}
.about-detail {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-light);
}
.about-detail i {
  color: var(--accent);
  font-size: 16px;
  width: 20px;
  text-align: center;
}
.about-photo {
  flex-shrink: 0;
  position: relative;
}
.about-photo img {
  width: 240px;
  height: 240px;
  border-radius: 12px;
  object-fit: cover;
  object-position: center top;
  border: 2px solid var(--accent);
  transition: var(--transition);
}
.about-photo img:hover {
  transform: translate(-4px, -4px);
}
.about-photo::after {
  content: '';
  position: absolute;
  top: 14px;
  left: 14px;
  width: 240px;
  height: 240px;
  border: 2px solid var(--accent);
  border-radius: 12px;
  z-index: -1;
  transition: var(--transition);
}
.about-photo:hover::after {
  top: 10px;
  left: 10px;
}
.value-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.value-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 32px 24px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.value-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-5px);
}
.value-card-icon {
  font-size: 36px;
  color: var(--accent);
  margin-bottom: 16px;
}
.value-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 16px;
}
.value-card-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.value-card-items .pill {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: rgba(100,255,218,0.1);
  padding: 4px 12px;
  border-radius: 20px;
}

/* ===== EXPERIENCE TABS ===== */
.exp-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 2px solid #233554;
  margin-bottom: 30px;
}
.exp-tab {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  padding: 12px 20px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.exp-tab:hover { color: var(--accent); background: rgba(100,255,218,0.05); }
.exp-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.exp-panel { display: none; }
.exp-panel.active { display: block; }

.exp-entry { margin-bottom: 40px; }
.exp-entry:last-child { margin-bottom: 0; }
.exp-role {
  font-size: 20px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 4px;
}
.exp-role .company { color: var(--accent); }
.exp-role .company a { color: var(--accent); }
.exp-role .company a:hover { text-decoration: underline; }
.exp-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  margin-bottom: 16px;
}
.exp-bullets li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.6;
}
.exp-bullets li::before {
  content: '\25B8';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 14px;
}

/* More roles expandable */
.more-roles { margin-top: 30px; }
.more-toggle {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  background: none;
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 10px 20px;
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 20px;
}
.more-toggle:hover { background: rgba(100,255,218,0.1); }
.more-content { display: none; }
.more-content.open { display: block; }
.more-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: var(--transition);
}
.more-item:hover { border-color: var(--card-border-hover); }
.more-item-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 4px;
}
.more-item-title .company { color: var(--accent); }
.more-item-title .company a { color: var(--accent); }
.more-item-title .company a:hover { text-decoration: underline; }
.more-item-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  margin-bottom: 8px;
}
.more-item-desc {
  font-size: 14px;
  line-height: 1.6;
}

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 24px;
}
.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 28px 24px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.skill-category:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-3px);
}
.skill-category-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.skill-category-title i {
  color: var(--accent);
  font-size: 18px;
}
.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-pill {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: rgba(100,255,218,0.1);
  padding: 6px 14px;
  border-radius: 20px;
  transition: var(--transition);
}
.skill-pill:hover {
  background: rgba(100,255,218,0.2);
}

/* ===== PUBLICATIONS & LEADERSHIP ===== */
.pub-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 32px;
  backdrop-filter: blur(10px);
  margin-bottom: 30px;
  transition: var(--transition);
}
.pub-card:hover { border-color: var(--card-border-hover); }
.pub-icon {
  font-size: 32px;
  color: var(--accent);
  margin-bottom: 16px;
}
.pub-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 8px;
}
.pub-title a {
  color: var(--heading);
  text-decoration: none;
  transition: var(--transition);
}
.pub-title a:hover {
  color: var(--accent);
}
.pub-venue {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  margin-bottom: 12px;
}
.pub-venue a {
  color: var(--text);
  text-decoration: none;
  transition: var(--transition);
}
.pub-venue a:hover {
  color: var(--accent);
}
.pub-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: rgba(100,255,218,0.1);
  padding: 6px 14px;
  border-radius: 20px;
  margin-right: 8px;
  margin-bottom: 8px;
}
.pub-abstract {
  font-size: 15px;
  line-height: 1.7;
  margin-top: 16px;
  margin-bottom: 16px;
  color: var(--text);
}
.pub-authors {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 8px;
}
.pub-authors strong {
  color: var(--accent);
}
.leadership-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 24px;
}
.leadership-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 28px 24px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.leadership-card:hover { border-color: var(--card-border-hover); transform: translateY(-3px); }
.leadership-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 4px;
}
.leadership-card-role {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 12px;
}
.leadership-card-desc {
  font-size: 14px;
  line-height: 1.6;
}

/* ===== FEATURED ARTICLES ===== */
.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 2rem;
}

.article-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  background: var(--card-bg);
  color: var(--text-muted);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  cursor: pointer;
  transition: all var(--transition-speed, 0.3s) ease;
}

.filter-btn:hover {
  border-color: var(--accent, #00d4aa);
  color: var(--accent, #00d4aa);
}

.filter-btn.active {
  background: var(--accent, #00d4aa);
  color: var(--bg, #0a1628);
  border-color: var(--accent, #00d4aa);
  font-weight: 600;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.article-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  overflow: hidden;
  transition: all var(--transition-speed, 0.3s) ease;
  position: relative;
  cursor: pointer;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent, #00d4aa);
  transform: scaleX(0);
  transition: transform var(--transition-speed, 0.3s) ease;
}

.article-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.article-card:hover::after {
  transform: scaleX(1);
}

.article-card-content {
  padding: 1.5rem;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  border-radius: 12px;
  background: rgba(0, 212, 170, 0.1);
  color: var(--accent, #00d4aa);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: capitalize;
}

.article-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.article-tag {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: rgba(0, 212, 170, 0.08);
  color: var(--accent, #00d4aa);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent, #00d4aa);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: gap var(--transition-speed, 0.3s) ease;
}

.article-link:hover {
  gap: 0.6rem;
}

.articles-empty,
.articles-loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 1rem;
  font-size: 1rem;
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 0.5rem;
  }
  .filter-btn {
    white-space: nowrap;
  }
}

/* ===== EDUCATION & CERTIFICATIONS ===== */
.edu-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 32px;
  backdrop-filter: blur(10px);
  margin-bottom: 30px;
  display: flex;
  align-items: flex-start;
  gap: 24px;
  transition: var(--transition);
}
.edu-card:hover { border-color: var(--card-border-hover); }
.edu-icon {
  font-size: 40px;
  color: var(--accent);
  flex-shrink: 0;
}
.edu-info h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 4px;
}
.edu-info h3 a {
  color: var(--heading);
  transition: var(--transition);
}
.edu-info h3 a:hover {
  color: var(--accent);
}
.edu-info p {
  font-size: 15px;
  margin-bottom: 2px;
}
.edu-info .edu-dates {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
}
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(250px, 100%), 1fr));
  gap: 16px;
}
.cert-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: var(--transition);
}
.cert-card:hover { border-color: var(--card-border-hover); transform: translateY(-2px); }
.cert-card i {
  font-size: 24px;
  color: var(--accent);
  flex-shrink: 0;
}
.cert-card .cert-logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  object-fit: contain;
  border-radius: 4px;
}
.cert-card svg.cert-logo {
  width: 36px;
  height: 28px;
  flex-shrink: 0;
}
.cert-card span {
  font-size: 14px;
  color: var(--text-light);
}

/* ===== CONTACT ===== */
.contact-section {
  text-align: center;
  padding: 100px 50px;
  max-width: 700px;
  margin: 0 auto;
}
.contact-heading {
  font-size: clamp(28px, 6vw, 42px);
  font-weight: 700;
  color: var(--heading);
  margin-bottom: 16px;
}
.contact-number {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent);
  margin-bottom: 12px;
}
.contact-text {
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 40px;
}
.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
  display: block;
}
.contact-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-5px);
}
.contact-card i {
  font-size: 28px;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}
.contact-card span {
  font-size: 13px;
  color: var(--text-light);
  word-break: break-all;
}
.btn-hello {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 16px 48px;
  background: transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}
.btn-hello:hover { background: rgba(100,255,218,0.1); }

/* ===== RESEARCH-SPECIFIC: Highlight Card ===== */
.research-highlight {
  background: linear-gradient(135deg, rgba(100,255,218,0.05) 0%, rgba(17,34,64,0.9) 100%);
  border: 1px solid rgba(100,255,218,0.2);
  border-radius: 12px;
  padding: 40px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.research-highlight::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
}
.research-highlight .pub-title {
  font-size: 22px;
}
.research-interests {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 24px;
  margin-top: 30px;
}
.interest-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 28px 24px;
  transition: var(--transition);
}
.interest-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-3px);
}
.interest-card-icon {
  font-size: 28px;
  color: var(--accent);
  margin-bottom: 14px;
}
.interest-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 10px;
}
.interest-card p {
  font-size: 14px;
  line-height: 1.6;
}

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  padding: 40px 50px;
  border-top: 1px solid #233554;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 16px;
}
.footer-links a {
  font-size: 20px;
  color: var(--text);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent); transform: translateY(-3px); }
.footer-nav {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 16px;
}
.footer-nav a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s ease;
}
.footer-nav a:hover { color: var(--accent); }
.footer-text {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  line-height: 1.8;
}

/* ===== SCROLL ANIMATION ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .metrics-inner { grid-template-columns: repeat(2, 1fr); }
  .value-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav { padding: 0 25px; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: flex; }
  .hero { padding: 0 25px; flex-direction: column; text-align: center; gap: 40px; }
  .hero-image { order: -1; margin-top: 80px; }
  .hero-image img { width: 200px; height: 200px; }
  .hero-image::after { width: 200px; height: 200px; }
  .hero-buttons { justify-content: center; }
  .trust-strip { justify-content: center; }
  .about-layout { flex-direction: column; align-items: center; }
  .about-photo { order: -1; }
  .about-photo img { width: 200px; height: 200px; }
  .about-photo::after { width: 200px; height: 200px; }
  .about-details { justify-content: center; }
  .section { padding: 80px 25px; }
  .metrics { padding: 60px 25px; }
  .metrics-inner { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .value-cards { grid-template-columns: 1fr; }
  .contact-section { padding: 80px 25px; }
  .contact-cards { grid-template-columns: 1fr; }
  .footer { padding: 40px 25px; }
  .leadership-grid { grid-template-columns: 1fr; }
  .hero-tagline { font-size: clamp(24px, 5vw, 48px); }
  .research-highlight { padding: 24px; }
  .research-interests { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .metrics-inner { grid-template-columns: 1fr; }
  .metric-number { font-size: 36px; }
  .hero-name { font-size: clamp(32px, 8vw, 56px); }
  .hero-tagline { font-size: clamp(20px, 5vw, 36px); }
  .exp-tabs { gap: 0; }
  .exp-tab { padding: 10px 14px; font-size: 12px; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons a { text-align: center; }
  .edu-card { flex-direction: column; align-items: center; text-align: center; }
  .pub-card { padding: 24px 16px; }
  .about-details { flex-direction: column; align-items: center; }
  .page-switcher { display: none; }
}

/* ===== RESUME DROPDOWN ===== */
.resume-dropdown {
  position: relative;
  display: inline-block;
}
.resume-toggle {
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.resume-toggle .fa-chevron-down {
  font-size: 10px;
  transition: transform 0.2s ease;
}
.resume-dropdown.open .resume-toggle .fa-chevron-down {
  transform: rotate(180deg);
}
.resume-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 160px;
  background: #112240;
  border: 1px solid #233554;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 1000;
  overflow: hidden;
}
.resume-dropdown.open .resume-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.resume-dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  color: #8892b0;
  font-size: 14px;
  font-family: var(--font-mono);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
  min-height: 44px;
}
.resume-dropdown-menu a:hover,
.resume-dropdown-menu a:focus-visible {
  background: rgba(100, 255, 218, 0.08);
  color: #64ffda;
}
.resume-dropdown-menu a i {
  width: 16px;
  text-align: center;
  font-size: 14px;
}
/* Mobile menu dropdown positioning */
.mobile-menu .resume-dropdown {
  width: 100%;
}
.mobile-menu .resume-dropdown-menu {
  position: static;
  min-width: 100%;
  opacity: 0;
  visibility: hidden;
  transform: none;
  max-height: 0;
  transition: opacity 0.2s ease, visibility 0.2s, max-height 0.3s ease;
  box-shadow: none;
  border: none;
  border-radius: 0;
  background: rgba(17, 34, 64, 0.6);
}
.mobile-menu .resume-dropdown.open .resume-dropdown-menu {
  opacity: 1;
  visibility: visible;
  max-height: 200px;
}
/* Landing page dropdown positioning */
.landing .resume-dropdown {
  display: inline-block;
}
.landing .resume-dropdown-menu {
  left: 50%;
  right: auto;
  transform: translateX(-50%) translateY(-8px);
  bottom: calc(100% + 8px);
  top: auto;
}
.landing .resume-dropdown.open .resume-dropdown-menu {
  transform: translateX(-50%) translateY(0);
}