/* ========================================
   Component Styles
   Cards, Buttons, Tags, Timeline, etc.
   ======================================== */

/* =========================
   Animations
   ========================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink {
  0%, 50% { border-color: var(--color-primary); }
  51%, 100% { border-color: transparent; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px var(--color-primary), 0 0 10px var(--color-primary); }
  50% { box-shadow: 0 0 20px var(--color-primary), 0 0 30px var(--color-primary); }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes borderGlow {
  0%, 100% { border-color: var(--color-primary); }
  50% { border-color: var(--color-accent); }
}

/* Reveal on scroll animation class */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger delay for grid items */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* =========================
   Links
   ========================= */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-colors);
}

a:hover {
  color: var(--color-primary-light);
}

/* =========================
   Buttons
   ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-decoration: none;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-all);
  white-space: nowrap;
}

.btn i {
  font-size: var(--text-base);
}

/* Primary Button */
.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Secondary Button */
.btn-secondary {
  background-color: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
  color: #fff;
  transform: translateY(-2px);
}

/* Outline Button */
.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
  border-color: var(--border-color);
}

.btn-ghost:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

/* Small Button */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-sm i {
  font-size: var(--text-sm);
}

/* =========================
   Cards
   ========================= */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  padding: var(--space-6);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

/* Gradient border effect on hover */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover::before {
  opacity: 1;
}

[data-theme="dark"] .card {
  background: #0f172a;
  border-color: #334155;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
}

[data-theme="dark"] .card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 20px 40px rgba(96, 165, 250, 0.15), 0 0 0 1px rgba(96, 165, 250, 0.1);
}

.card-header {
  margin-bottom: var(--space-4);
}

.card-title {
  font-family: var(--font-family-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: var(--leading-snug);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.card-body {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.card-body p {
  margin-bottom: var(--space-3);
}

.card-body p:last-child {
  margin-bottom: 0;
}

.card-footer {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Card with Icon */
.card-icon {
  display: flex;
  gap: var(--space-4);
}

.card-icon-wrapper {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  color: var(--color-primary);
  font-size: var(--text-xl);
}

.card-icon-content {
  flex: 1;
}

/* Clickable Card */
.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.card-link:hover {
  color: inherit;
}

/* Achievement Card (centered) - Bento Style */
.card-achievement {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  position: relative;
  overflow: hidden;
}

.card-achievement::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.03) 0%, rgba(16, 185, 129, 0.03) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card-achievement:hover::before {
  opacity: 1;
}

.card-achievement .card-icon-wrapper {
  width: 70px;
  height: 70px;
  margin: 0 auto var(--space-4);
  font-size: var(--text-2xl);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-indigo) 100%);
  color: #fff;
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-achievement:hover .card-icon-wrapper {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.card-achievement:nth-child(2) .card-icon-wrapper {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-cyan) 100%);
}

.card-achievement:nth-child(2):hover .card-icon-wrapper {
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
}

.card-achievement:nth-child(3) .card-icon-wrapper {
  background: linear-gradient(135deg, var(--color-purple) 0%, var(--color-pink) 100%);
}

.card-achievement:nth-child(3):hover .card-icon-wrapper {
  box-shadow: 0 10px 30px rgba(139, 92, 246, 0.3);
}

.card-achievement:nth-child(4) .card-icon-wrapper {
  background: linear-gradient(135deg, var(--color-orange) 0%, var(--color-pink) 100%);
}

.card-achievement:nth-child(5) .card-icon-wrapper {
  background: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-primary) 100%);
}

.card-achievement .card-title {
  font-size: var(--text-base);
  position: relative;
  z-index: 1;
}

.card-achievement .card-body {
  font-size: var(--text-sm);
  position: relative;
  z-index: 1;
}

/* =========================
   Tags / Badges
   ========================= */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  white-space: nowrap;
  border: 1px solid rgba(59, 130, 246, 0.2);
  transition: all 0.2s ease;
}

.tag:hover {
  background: rgba(59, 130, 246, 0.15);
  transform: translateY(-1px);
}

[data-theme="dark"] .tag {
  background: rgba(96, 165, 250, 0.15);
  color: #93c5fd;
  border-color: rgba(96, 165, 250, 0.2);
}

.tag-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.tag-accent {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-accent);
  border-color: rgba(16, 185, 129, 0.2);
}

[data-theme="dark"] .tag-accent {
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.2);
}

.tag-purple {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-purple);
  border-color: rgba(139, 92, 246, 0.2);
}

.tag-orange {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-orange);
  border-color: rgba(245, 158, 11, 0.2);
}

.tag-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-color: transparent;
}

/* =========================
   Highlight Box
   ========================= */
.highlight-box {
  background: var(--bg-secondary);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin: var(--space-4) 0;
}

.highlight-box p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.highlight-box strong {
  color: var(--text-primary);
}

.highlight-box-accent {
  border-left-color: var(--color-accent);
}

/* =========================
   Timeline
   ========================= */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-8);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) - 4px);
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-primary);
}

.timeline-date {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.timeline-content {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: var(--transition-all);
}

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

/* =========================
   Skills Grid
   ========================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.skill-category {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.05), transparent);
  transition: left 0.5s ease;
}

.skill-category:hover::before {
  left: 100%;
}

.skill-category:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.skill-category h4 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.skill-category h4 i {
  color: var(--color-primary);
  transition: transform 0.3s ease;
}

.skill-category:hover h4 i {
  transform: scale(1.2);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.skill-tags .tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  transition: var(--transition-all);
}

.skill-tags .tag:hover {
  background: var(--color-primary);
  color: #fff;
}

/* =========================
   Publication Card
   ========================= */
.publication-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-bottom: var(--space-4);
  transition: var(--transition-all);
}

.publication-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.publication-card:last-child {
  margin-bottom: 0;
}

.publication-title {
  font-family: var(--font-family-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-snug);
}

.publication-meta {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.publication-meta strong {
  color: var(--text-primary);
}

/* =========================
   Contact Info
   ========================= */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  text-align: center;
}

.contact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-item i {
  font-size: var(--text-3xl);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.contact-item h5 {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.contact-item p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.contact-item a {
  color: var(--color-primary);
}

.contact-item a:hover {
  text-decoration: underline;
}

/* =========================
   Focus Area Cards
   ========================= */
.focus-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  height: 100%;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.focus-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

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

.focus-card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--color-accent), var(--color-cyan));
}

.focus-card:nth-child(3)::before {
  background: linear-gradient(90deg, var(--color-purple), var(--color-pink));
}

.focus-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(59, 130, 246, 0.15);
  border-color: var(--color-primary);
}

.focus-card h4 {
  font-family: var(--font-family-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  transition: color 0.3s ease;
}

.focus-card:hover h4 {
  color: var(--color-primary-dark);
}

.focus-card p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* =========================
   Education Card
   ========================= */
.education-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  height: 100%;
  transition: var(--transition-all);
}

.education-card:hover {
  box-shadow: var(--shadow-lg);
}

.education-card h4 {
  font-family: var(--font-family-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.education-date {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.education-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-relaxed);
}

/* =========================
   Experience Card
   ========================= */
.experience-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: var(--transition-all);
  display: flex;
  gap: var(--space-4);
}

.experience-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent);
}

.experience-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
  border-radius: var(--radius-lg);
  color: var(--color-primary);
  font-size: var(--text-2xl);
}

.experience-content {
  flex: 1;
}

.experience-content h4 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.experience-company {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.experience-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* =========================
   Utilities
   ========================= */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-3 {
  margin-bottom: var(--space-3);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mt-4 {
  margin-top: var(--space-4);
}

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

/* =========================
   Responsive Adjustments
   ========================= */
@media (max-width: 768px) {
  .card {
    padding: var(--space-4);
  }
  
  .card-title {
    font-size: var(--text-base);
  }
  
  .experience-card {
    flex-direction: column;
  }
  
  .experience-icon {
    width: 48px;
    height: 48px;
    font-size: var(--text-xl);
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
}