/* ============================================
   Academic Portfolio - Design System
   Dr. P. Chinnasamy
   ============================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:wght@400;500;600;700&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Colors */
  --primary: #1a3a5c;
  --primary-light: #2563eb;
  --primary-lighter: #3b82f6;
  --primary-bg: #eff6ff;
  --primary-50: #f0f7ff;
  --accent: #1e40af;
  --accent-light: #60a5fa;
  --text-dark: #1e293b;
  --text-medium: #475569;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-section: #f1f5f9;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;

  /* Spacing */
  --section-padding: 80px 0;
  --container-max: 1140px;
  --container-padding: 0 24px;

  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background-color: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul,
ol {
  list-style: none;
}

/* ── Container ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--container-padding);
}

/* ── Typography ── */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--primary);
  line-height: 1.3;
}

h1 {
  font-size: 2.75rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
  font-weight: 600;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  color: var(--text-medium);
  margin-bottom: 1rem;
}

/* ── Section ── */
.section {
  padding: var(--section-padding);
}

.section--alt {
  background-color: var(--bg-light);
}

.section__header {
  text-align: center;
  margin-bottom: 50px;
}

.section__title {
  font-size: 2.25rem;
  color: var(--primary);
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--accent-light));
  border-radius: 2px;
}

.section__subtitle {
  font-family: var(--font-body);
  color: var(--text-light);
  font-size: 1.05rem;
  font-weight: 400;
  max-width: 600px;
  margin: 20px auto 0;
}

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--border);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--container-padding);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
}

.navbar__brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  font-weight: 700;
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar__link {
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-medium);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.navbar__link:hover,
.navbar__link.active {
  color: var(--primary-light);
  background-color: var(--primary-50);
}

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.navbar__toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Hero Section ── */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--bg-white) 0%, var(--primary-50) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.04) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 60px;
  align-items: center;
}

.hero__image-wrapper {
  position: relative;
}

.hero__image-wrapper::before {
  content: '';
  position: absolute;
  inset: -6px;
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  border-radius: var(--radius-xl);
  opacity: 0.15;
}

.hero__image {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-lg);
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-xl);
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary-light);
  background: var(--primary-bg);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__name {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  line-height: 1.15;
}

.hero__designation {
  font-size: 1.15rem;
  color: var(--primary-light);
  font-weight: 500;
  margin-bottom: 4px;
}

.hero__department {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

.hero__bio {
  font-size: 1rem;
  color: var(--text-medium);
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 560px;
}

/* ── Research Interest Tags ── */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--primary);
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 20px;
  transition: var(--transition);
}

.tag:hover {
  background: var(--primary-bg);
  border-color: var(--primary-light);
  color: var(--primary-light);
  transform: translateY(-1px);
}

/* ── Highlight Cards ── */
.highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 60px;
}

.highlight-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--accent-light));
  transform: scaleX(0);
  transition: var(--transition);
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.highlight-card:hover::before {
  transform: scaleX(1);
}

.highlight-card__icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.highlight-card__title {
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--primary);
}

.highlight-card__sub {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* ── Cards ── */
.card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: rgba(37, 99, 235, 0.15);
}

.card__icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.card__title {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 10px;
}

.card__text {
  font-size: 0.92rem;
  color: var(--text-light);
  line-height: 1.7;
}

.card__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary-light);
  background: var(--primary-bg);
  padding: 4px 10px;
  border-radius: 12px;
  margin-top: 14px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.cards-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.cards-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

/* ── Timeline ── */
.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-light), var(--accent-light));
  border-radius: 2px;
}

.timeline__item {
  position: relative;
  margin-bottom: 36px;
  padding-left: 24px;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--bg-white);
  border: 3px solid var(--primary-light);
  border-radius: 50%;
  z-index: 1;
}

.timeline__year {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.timeline__title {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 4px;
}

.timeline__text {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* ── Tables ── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.table thead {
  background: var(--primary);
  color: white;
}

.table th {
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-medium);
}

.table tbody tr {
  transition: var(--transition);
}

.table tbody tr:hover {
  background-color: var(--primary-50);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-badge--ongoing {
  color: #059669;
  background: #ecfdf5;
}

.status-badge--completed {
  color: var(--primary-light);
  background: var(--primary-bg);
}

/* ── Publication Entry ── */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.pub-entry {
  padding: 24px 28px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--primary-light);
  transition: var(--transition);
}

.pub-entry:hover {
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}

.pub-entry__title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.pub-entry__authors {
  font-size: 0.88rem;
  color: var(--text-medium);
  margin-bottom: 4px;
}

.pub-entry__venue {
  font-size: 0.85rem;
  color: var(--text-light);
  font-style: italic;
}

.pub-entry__year {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary-light);
}

.pub-entry__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--primary-light);
  margin-top: 8px;
}

.pub-entry__link:hover {
  color: var(--accent);
}

.pub-section-title {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  padding-bottom: 12px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--primary-bg);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Tabs ── */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0;
}

.tab-btn {
  padding: 12px 24px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--primary-light);
}

.tab-btn.active {
  color: var(--primary-light);
  border-bottom-color: var(--primary-light);
  font-weight: 600;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

/* ── Qualification Card ── */
.qual-card {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  margin-bottom: 16px;
}

.qual-card:hover {
  box-shadow: var(--shadow-md);
}

.qual-card__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--primary-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.qual-card__title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 2px;
}

.qual-card__text {
  font-size: 0.88rem;
  color: var(--text-light);
}

/* ── Membership Badge ── */
.membership-list {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.membership-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.membership-badge:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.membership-badge__icon {
  width: 44px;
  height: 44px;
  background: var(--primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-light);
}

.membership-badge__name {
  font-weight: 600;
  color: var(--primary);
  font-size: 0.95rem;
}

.membership-badge__role {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ── Course Cards ── */
.course-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.course-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
  border-left: 3px solid var(--primary-light);
}

.course-card__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary-bg), rgba(37, 99, 235, 0.1));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.course-card__name {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary);
}

.course-card__code {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 2px;
}

/* ── Achievement ── */
.achievement-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.achievement-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

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

.achievement-item__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.achievement-item__title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary);
  margin-bottom: 4px;
}

.achievement-item__text {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ── Contact ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.contact-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--primary-light);
}

.contact-item__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.contact-item__label {
  font-size: 0.8rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.contact-item__value {
  font-size: 0.92rem;
  color: var(--primary);
  font-weight: 500;
}

/* ── Form ── */
.form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form__label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
}

.form__input,
.form__textarea {
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  background: var(--bg-white);
  color: var(--text-dark);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form__textarea {
  resize: vertical;
  min-height: 130px;
}

.form__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  align-self: flex-start;
}

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

/* ── Footer ── */
.footer {
  background: var(--primary);
  color: rgba(255, 255, 255, 0.8);
  padding: 48px 0 24px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: white;
  margin-bottom: 12px;
}

.footer__text {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

.footer__heading {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__link {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.6);
  transition: var(--transition);
}

.footer__link:hover {
  color: white;
  transform: translateX(4px);
}

.footer__social {
  display: flex;
  gap: 10px;
}

.footer__social-link {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
  font-size: 0.85rem;
}

.footer__social-link:hover {
  background: var(--primary-light);
  color: white;
  transform: translateY(-2px);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ── Lab Section ── */
.lab-hero {
  text-align: center;
  padding: 50px 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: var(--radius-lg);
  color: white;
  margin-bottom: 50px;
}

.lab-hero__title {
  color: white;
  font-size: 2rem;
  margin-bottom: 12px;
}

.lab-hero__text {
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1rem;
}

/* ── Scholar Card ── */
.scholar-card {
  padding: 24px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.scholar-card:hover {
  box-shadow: var(--shadow-md);
}

.scholar-card__name {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 6px;
}

.scholar-card__topic {
  font-size: 0.9rem;
  color: var(--text-medium);
  margin-bottom: 8px;
}

.scholar-card__desc {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.scholar-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ── Page Header ── */
.page-header {
  padding: 130px 0 50px;
  background: linear-gradient(135deg, var(--bg-white) 0%, var(--primary-50) 100%);
  text-align: center;
}

.page-header__title {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 10px;
}

.page-header__subtitle {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--text-light);
  font-weight: 400;
}

/* ── Animations ── */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive Design ── */
@media (max-width: 1024px) {
  .hero__grid {
    grid-template-columns: 260px 1fr;
    gap: 40px;
  }

  .highlights {
    grid-template-columns: repeat(2, 1fr);
  }

  .cards-grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.65rem;
  }

  .section {
    padding: 60px 0;
  }

  .section__title {
    font-size: 1.85rem;
  }

  .navbar__menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-white);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    gap: 2px;
  }

  .navbar__menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .navbar__link {
    display: block;
    padding: 10px 14px;
    width: 100%;
  }

  .navbar__toggle {
    display: flex;
  }

  .hero {
    padding: 110px 0 60px;
  }

  .hero__grid {
    grid-template-columns: 1fr;
    gap: 30px;
    text-align: center;
  }

  .hero__image-wrapper {
    max-width: 250px;
    margin: 0 auto;
  }

  .hero__name {
    font-size: 2.25rem;
  }

  .hero__bio {
    margin-left: auto;
    margin-right: auto;
  }

  .tags {
    justify-content: center;
  }

  .highlights {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .cards-grid,
  .cards-grid--3,
  .cards-grid--2 {
    grid-template-columns: 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .page-header {
    padding: 110px 0 40px;
  }

  .page-header__title {
    font-size: 2rem;
  }

  .tabs {
    overflow-x: auto;
    gap: 0;
  }

  .tab-btn {
    padding: 10px 16px;
    white-space: nowrap;
    font-size: 0.85rem;
  }

  .timeline {
    padding-left: 30px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 16px;
  }

  .hero__name {
    font-size: 1.9rem;
  }

  .highlights {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .highlight-card {
    padding: 20px 14px;
  }

  .table th,
  .table td {
    padding: 10px 14px;
    font-size: 0.85rem;
  }
}

/* ============================================
   New Component Styles
   ============================================ */

/* ── Metrics Grid ── */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
}

.metric-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.metric-card__value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
}

.metric-card__label {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-top: 6px;
  font-weight: 500;
}

.metric-card__icon {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 1.5rem;
  opacity: 0.3;
}

/* ── Gallery Grid ── */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.gallery-item {
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  aspect-ratio: 4/3;
  background: var(--bg-light);
}

.gallery-item__img-wrapper {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.gallery-item__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.gallery-item:hover .gallery-item__img {
  transform: scale(1.08);
}

.gallery-item__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  color: white;
  padding: 24px 16px 16px;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-item__overlay {
  transform: translateY(0);
}

.gallery-item__caption {
  font-size: 0.9rem;
  font-weight: 600;
}

.gallery-item__date {
  font-size: 0.78rem;
  opacity: 0.8;
  margin-top: 4px;
}

/* ── Gallery Filter Tabs ── */
.gallery-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.gallery-filter__btn {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg-white);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-medium);
}

.gallery-filter__btn:hover,
.gallery-filter__btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ── Lightbox ── */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.lightbox.active {
  display: flex;
}

.lightbox__img {
  max-width: 85vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 8px;
}

.lightbox__close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.lightbox__close:hover {
  opacity: 1;
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: white;
  font-size: 2.5rem;
  cursor: pointer;
  padding: 10px 16px;
  border-radius: 8px;
  transition: background 0.2s;
}

.lightbox__nav:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox__nav--prev {
  left: 20px;
}

.lightbox__nav--next {
  right: 20px;
}

.lightbox__caption {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: white;
  font-size: 0.95rem;
  background: rgba(0, 0, 0, 0.5);
  padding: 8px 20px;
  border-radius: 20px;
  white-space: nowrap;
}

/* ── Patent Card ── */
.patents-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.patent-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 28px;
  transition: all 0.3s ease;
}

.patent-card:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.patent-card__header {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
}

.patent-card__icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.patent-card__title {
  font-weight: 600;
  color: var(--primary);
  font-size: 1rem;
  margin-bottom: 4px;
}

.patent-card__inventors {
  font-size: 0.88rem;
  color: var(--text-light);
}

.patent-card__desc {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.7;
  margin-bottom: 14px;
}

.patent-card__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.patent-card__number {
  font-size: 0.82rem;
  color: #94a3b8;
  font-family: monospace;
}

.status-badge--filed {
  color: #d97706;
  background: #fffbeb;
}

.status-badge--published {
  color: #2563eb;
  background: #eff6ff;
}

.status-badge--granted {
  color: #059669;
  background: #ecfdf5;
}

/* ── Course Detail Card ── */
.courses-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.course-detail-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 28px;
  transition: all 0.3s ease;
}

.course-detail-card:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.course-detail-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
}

.course-detail-card__icon {
  font-size: 2rem;
}

.course-detail-card__title {
  font-weight: 600;
  color: var(--primary);
  font-size: 1.05rem;
}

.course-detail-card__code {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-top: 2px;
}

.course-detail-card__desc {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.7;
  margin: 12px 0;
}

.course-materials {
  margin-top: 8px;
  border-top: 1px solid var(--bg-light);
  padding-top: 14px;
}

.course-materials__header {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 10px;
}

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

.course-materials__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 6px;
  transition: background 0.2s;
}

.course-materials__item:hover {
  background: var(--bg-light);
}

.course-materials__icon {
  font-size: 1rem;
}

.course-materials__name {
  flex: 1;
  font-size: 0.88rem;
  color: var(--text-medium);
}

.course-materials__download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: #eff6ff;
  border-radius: 6px;
  color: var(--primary-light);
  font-size: 0.9rem;
  text-decoration: none;
  transition: all 0.2s;
}

.course-materials__download:hover {
  background: var(--primary-light);
  color: white;
}

/* ── Responsive additions ── */
@media (max-width: 768px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .metric-card {
    padding: 20px 14px;
  }

  .metric-card__value {
    font-size: 1.8rem;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }
}