:root {
  --bg-color: #fff;
  --text-color: #2d3748;
  --text-secondary: #4a5568;
  --accent-color: #4a74b9;
  --accent-hover: #3a5c9e;
  --border-color: #e2e8f0;
  --shadow-color: rgba(0,0,0,0.05);
  --animation-offset: 3px;
  --transition-time: 0.3s;
  --card-bg: #f6f6ff;
  --input-bg: #f7f7ff;
  /* Cache buster: v2.0 */
}

/* Smooth scroll behavior */
html {
  scroll-behavior: smooth;
}

/* Dark mode variables */
html.dark-mode {
  --bg-color: #1a1a2e;
  --text-color: #e8e8f0;
  --text-secondary: #b8b8c8;
  --accent-color: #6b94d6;
  --accent-hover: #5a7fc9;
  --border-color: #2d2d44;
  --shadow-color: rgba(0,0,0,0.3);
  --card-bg: #252543;
  --input-bg: #2d2d44;
}

/* Animations for section icons */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

/* Scroll animation - fade in from bottom */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll animation - fade in from left */
@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Scroll animation - fade in from right */
@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Smooth scrolling for in-page links */
html {
  scroll-behavior: smooth;
  transition: background-color var(--transition-time) ease, color var(--transition-time) ease;
}
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-color);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

#nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.45rem 0.55rem;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  transition: all var(--transition-time) ease;
}

#nav-toggle:hover {
  background-color: rgba(74, 116, 185, 0.08);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-color);
  border-radius: 999px;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.75rem;
  align-items: center;
  flex: 1;
}

/* Theme toggle button */
#theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  transition: all var(--transition-time) ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
}

#theme-toggle:hover {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
  transform: scale(1.1);
}



body {
  font-family: 'Merriweather', Georgia, 'Times New Roman', serif;
  line-height: 1.75;
  letter-spacing: 0.3px;
  margin: 0;
  padding: 0;
  width: 100%;
  color: var(--text-color);
  background-color: var(--bg-color);
  font-weight: 300;
  min-height: 100vh;
  overflow-x: hidden;
}

main {
  display: flex;
  flex-direction: row;
  width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  height: var(--panel-height, auto);
}
   
header.about-hero {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
  padding-left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.header-content {
  flex: 1;
}

.header-image {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.header-image img {
  width: clamp(140px, 20vw, 200px);
  height: clamp(140px, 20vw, 200px);
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  transition: transform var(--transition-time) ease, box-shadow var(--transition-time) ease;
}

.header-image img:hover {
  transform: scale(1.02);
  box-shadow: 0 5px 15px var(--shadow-color);
}

h1 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 500;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
  flex-wrap: wrap;
}

h2 {
  font-size: clamp(1.8rem, 2.2vw, 2.6rem);
  display: flex;
  align-items: center;
  gap: 0.7em;
  transition: transform 0.3s ease, color 0.3s ease;
}

section {
  margin-bottom: 0;
  scroll-margin-top: 1rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out forwards;
  width: 100%;
  flex: 0 0 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding: 1.5rem 5vw;
  box-sizing: border-box;
  height: var(--panel-height, auto);
  overflow-y: auto;
  overscroll-behavior: contain;
}


/* Stagger animations for sections */
section:nth-child(1) { animation-delay: 0s; }
section:nth-child(2) { animation-delay: 0.15s; }
section:nth-child(3) { animation-delay: 0.3s; }
section:nth-child(4) { animation-delay: 0.45s; }
section:nth-child(5) { animation-delay: 0.6s; }
section:nth-child(6) { animation-delay: 0.75s; }
section:nth-child(7) { animation-delay: 0.9s; }
section:nth-child(8) { animation-delay: 1.05s; }

/* Publication styles */
.publication-item {
  margin-bottom: 1.5rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  gap: 1.25rem;
}

.pub-thumbnail {
  width: clamp(280px, 60vw, 650px);
  height: auto;
  aspect-ratio: 13 / 9;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

#publications-container {
  overflow-x: auto;
  overflow-y: hidden;
  width: 100%;
}

.pub-slider-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.pub-thumbnail:hover {
  box-shadow: 0 12px 24px rgba(74, 116, 185, 0.15);
  transform: translateY(-4px);
}

.pub-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.pub-thumbnail:hover img {
  transform: scale(1.2);
}

.pub-content {
  flex: 1;
}

.pub-title {
  font-weight: 500;
  margin-bottom: 0.4rem;
  font-size: clamp(0.95rem, 1.4vw, 1.2rem);
}

.pub-authors {
  font-size: clamp(0.85rem, 1vw, 0.95rem);
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
  line-height: 1.7;
  letter-spacing: 0.2px;
}

.highlight-name {
  font-weight: 600;
  color: var(--accent-color);
}

.pub-venue-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.pub-venue {
  font-size: clamp(0.8rem, 0.9vw, 0.9rem);
  font-style: italic;
  color: var(--text-secondary);
}

.pub-award {
  font-size: clamp(0.75rem, 0.85vw, 0.85rem);
  font-weight: 500;
  color: #fff;
  background-color: var(--accent-color);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  display: inline-block;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  white-space: nowrap;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(74, 116, 185, 0.4);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(74, 116, 185, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(74, 116, 185, 0);
  }
}

.pub-links {
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pub-links a {
  color: var(--accent-color);
  transition: all var(--transition-time) ease;
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  background-color: rgba(74, 116, 185, 0.08);
  border: 1px solid rgba(74, 116, 185, 0.2);
  font-weight: 500;
  letter-spacing: 0.3px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.pub-links a:hover {
  color: #fff;
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 116, 185, 0.25);
}

/* Awards section */
.award-item {
  display: flex;
  align-items: baseline;
  margin-bottom: 0.1rem;
}

.award-year {
  font-weight: 500;
  color: var(--accent-color);
  flex: 0 0 80px;
}

.award-desc {
  flex: 1;
}

.award-desc small {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-left: 0.5rem;
}

/* News section */
.news-container {
  max-height: 300px;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.news-container::-webkit-scrollbar {
  display: none;
}

.news-list {
  padding-left: 0;
  list-style-type: none;
  margin: 0.5rem 0;
}

.news-list li {
  margin-bottom: 0.9rem;
  padding-left: 0.9rem;
  border-left: 2px solid rgba(74, 116, 185, 0.2);
  padding-bottom: 0.7rem;
  line-height: 1.7;
  letter-spacing: 0.2px;
}

.news-list li:hover {
  border-left-color: var(--accent-color);
}

/* Services and misc */
.service-title {
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--accent-color);
}

.service-category p,
.misc-item p {
  margin: 0.25rem 0 0.75rem;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--accent-color);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  display: none;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-time) ease;
  box-shadow: 0 4px 12px var(--shadow-color);
  z-index: 999;
}

.back-to-top.show {
  display: flex;
}

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px var(--shadow-color);
}

.back-to-top:active {
  transform: translateY(-1px);
}

/* Footer */
footer {
  margin-top: 2.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Generic styles */
a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color var(--transition-time) ease;
}

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

em {
  font-style: italic;
  color: var(--text-secondary);
}

ul {
  padding-left: 1.25rem;
}

p {
  margin: 0.5rem 0 0.75rem;
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  line-height: 1.8; 
  text-align: justify;
}

strong {
  font-weight: 600;
  color: var(--accent-color);
}

/* Modal styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  padding-top: 100px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.85);
  transition: opacity var(--transition-time);
  opacity: 0;
}

.modal.show {
  opacity: 1;
}

.modal-content {
  margin: auto;
  display: block;
  max-width: 85%;
  max-height: 85%;
  border-radius: 4px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
  animation: zoom var(--transition-time) ease-out;
}

@keyframes zoom {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 35px;
  font-weight: normal;
  cursor: pointer;
  transition: color var(--transition-time);
  opacity: 0.8;
}

.modal-close:hover {
  color: #fff;
  opacity: 1;
  transform: scale(1.1);
}

/* Responsive design fixes removed per request */
.social-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0.5rem 0 1.5rem;
}

.social-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.5rem 0 1.5rem;
}

.social-icons a {
  font-size: clamp(3rem, 3vw, 2.6rem);  /* larger icons */
  transition: transform var(--transition-time) ease,
              opacity var(--transition-time) ease,
              filter var(--transition-time) ease;
}

.social-icons a:hover {
  transform: translateY(-3px) scale(1.1);
  opacity: 0.85;
  filter: drop-shadow(0 4px 8px rgba(74, 116, 185, 0.3));
}


/* Brand colors */
.social-linkedin  { color: #0a66c2; }   /* LinkedIn blue */
.social-researchgate { color: #00ccbb; }/* ResearchGate teal */
.social-gscholar  { color: #4285f4; }   /* Google blue */
.social-orcid     { color: #a6ce39; }   /* ORCID green */
.social-discord   { color: #5865f2; }   /* Discord blurple */
.social-mail      { color: #718096; }   /* Neutral gray for email */
.social-github       { color: #181717; }  /* GitHub black */


/* 3D Model Container */


.edu-item {
  margin-bottom: 1.75rem;
}

/* Header row: logo + text block */
.edu-header {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.35rem;
}

.edu-left {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.edu-logo {
  width: clamp(88px, 16vw, 184px);
  height: clamp(88px, 16vw, 184px);
  object-fit: contain;
  flex-shrink: 0;
}

.edu-text {
  display: flex;
  flex-direction: column;
}

.edu-school {
  font-weight: 600;
  font-size: clamp(1.25rem, 2.4vw, 1.8rem);
  margin: 0 0 0.05rem 0;
}

.edu-degree {
  color: var(--text-secondary);
  font-size: clamp(1.1rem, 2vw, 1.8rem);
  margin: 0 0 0.1rem 0;
}

/* Dates + location directly under degree */
.edu-meta {
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.edu-separator {
  opacity: 0.7;
}

/* Toggleable details (like experience) */
.edu-summary {
  margin-top: 0.25rem;
}

.edu-toggle {
  border: none;
  background: none;
  padding: 0;
  margin: 0;
  font: inherit;
  color: var(--accent-color);
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.edu-toggle::after {
  content: '▼';
  font-size: 0.75rem;
  transition: transform 0.3s ease;
}

.edu-toggle:hover {
  text-decoration: underline;
}

.edu-details {
  max-height: 0;
  overflow: hidden;
  list-style: disc inside;
  margin: 0.35rem 0 0.2rem;
  padding-left: 1.25rem;
  font-size: clamp(0.9rem, 1.3vw, 1rem);
  transition: max-height 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
  opacity: 0;
  transform: translateY(-4px);
}

.edu-details.is-open {
  max-height: 300px;
  opacity: 1;
  transform: translateY(0);
}

.edu-toggle.is-open::after {
  transform: rotate(180deg);
}

/* Experience timeline: one thick vertical line + dots */

.exp-timeline-wrapper {
  position: relative;
  display: grid;
  grid-template-columns: 24px 1fr;  /* left: line/dots, right: content */
  column-gap: 1rem;
}

/* Single vertical line from first to last experience */
.exp-timeline-line {
  position: absolute;
  top: 16px;                 /* near first dot */
  bottom: 16px;              /* near last dot */
  left: 12px;                /* center of 24px column */
  width: 4px;                /* visible thickness */
  background-color: var(--border-color);
}

/* Right column holds items */
.exp-items {
  grid-column: 2 / 3;
}

/* Each experience row */
.exp-item {
  display: grid;
  grid-template-columns: 24px 1fr;
  column-gap: 1rem;
  margin-bottom: 1.75rem;
}

/* Marker: dot centered over shared line */
.exp-marker {
  position: relative;
  height: 32px;
  margin-top: 0.4rem;        /* align with header */
}

.exp-dot {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--accent-color);
}

/* Experience content card */
.exp-content {
  flex: 1;
}

.exp-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.3rem;
}

.exp-logo {
  width: 184px;
  height: 184px;
  border-radius: 4px;
  object-fit: contain;
  flex-shrink: 0;
}

.exp-title {
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 1.5rem);
}

.exp-company {
  font-size: clamp(1.5rem, 2.4vw, 1.5rem);
  color: var(--text-secondary);
    transition: color 0.2s, text-decoration 0.2s;
  }
  .exp-company a {
    color: #0073e6;
    text-decoration: none;
  }
  .exp-company a:hover {
    color: #005bb5;
    text-decoration: underline;
  }

.exp-meta {
  font-size: clamp(0.95rem, 1.4vw, 1.05rem);
  color: var(--text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.exp-separator {
  opacity: 0.7;
}

/* Toggleable description */
.exp-description {
  margin-top: 0.35rem;
}

.exp-toggle {
  border: none;
  background: none;
  padding: 0;
  margin: 0;
  font: inherit;
  color: var(--accent-color);
  cursor: pointer;
  text-align: left;
}

.exp-toggle:hover {
  text-decoration: underline;
}

/* Hidden bullet list; shown when toggled in JS */
.exp-details {
  max-height: 0;
  overflow: hidden;
  list-style: disc inside;
  margin: 0.35rem 0 0.2rem;
  padding-left: 1.25rem;
  font-size: clamp(0.9rem, 1.1vw, 1rem);
  transition: max-height 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
  opacity: 0;
  transform: translateY(-4px);
}

.exp-details.is-open {
  max-height: 500px;
  opacity: 1;
  transform: translateY(0);
}

.exp-toggle.is-open::after {
  transform: rotate(180deg);
}

/* Publications slider controls */
.pub-slider-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

#pub-page-indicator {
  color: var(--text-secondary);
}

/* Publication slider arrow buttons (matching cert-arrow style) */
.pub-arrow {
  border: 1px solid rgba(74, 116, 185, 0.2);
  background-color: rgba(74, 116, 185, 0.05);
  color: var(--accent-color);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all var(--transition-time) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}
.pub-arrow:disabled {
  opacity: 0.3;
  cursor: default;
}
.pub-arrow:hover:not(:disabled) {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(74, 116, 185, 0.25);
}
.pub-arrow-left { margin-right: 0.5rem; }
.pub-arrow-right { margin-left: 0.5rem; }
/* Typewriter effect for name */
.typewriter {
  display: inline-block;
  border-right: 2px solid var(--accent-color);
  white-space: nowrap;
  overflow: hidden;
  /* 18 visible characters in "Md Asif Bin Karim" */
  width: 0ch;
  animation:
    typeWriterLoop 5s steps(18, end) infinite,
    caretBlink 0.75s step-end infinite;
}

/* Type -> pause -> delete -> pause -> repeat */
@keyframes typeWriterLoop {
  0%   { width: 0ch; }
  40%  { width: 13ch; }  /* finished typing */
  60%  { width: 13ch; }  /* hold full text */
  100% { width: 0ch; }   /* erased */
}

@keyframes caretBlink {
  from, to { border-color: transparent; }
  50%      { border-color: var(--accent-color); }
}

/* Contact section: map + form side by side */

#contact {
  margin-top: 2rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: stretch;
}

/* Panels share same dimensions */
.contact-panel {
  background-color: #f7f7ff;
  border-radius: 8px;
  padding: 1.25rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
}

/* Map fills its panel */
.contact-map {
  width: 100%;
  height: 100%;
  min-height: 320px;
  border-radius: 6px;
}

/* Form styles similar to your screenshot */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  height: 100%;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.contact-row label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-row input,
.contact-row textarea {
  border-radius: 6px;
  border: 1px solid var(--border-color);
  padding: 0.6rem 0.75rem;
  font: inherit;
  background-color: #f5f5ff;
  resize: vertical;
}

.contact-submit {
  margin-top: auto; /* push button to bottom so height matches map */
  align-self: flex-start;
  padding: 0.45rem 1.1rem;
  border-radius: 999px;
  border: none;
  background-color: var(--accent-color);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.contact-submit:hover {
  background-color: var(--accent-hover);
}

/* Stack on small screens */
/* Mobile stacking removed per request */
/* Certifications slider */

#certifications {
  margin-top: 2.5rem;
}

#certifications > p {
  margin-top: 0.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Slider shell */
.cert-slider {
  margin-top: 1.5rem;
  display: block;
}

/* Left/right arrows */
.cert-arrow {
  display: none;
}

.cert-arrow:disabled {
  opacity: 0.3;
  cursor: default;
}

.cert-arrow:hover:not(:disabled) {
  background-color: rgba(74, 116, 185, 0.08);
}

/* Visible window */
.cert-viewport {
  overflow: visible;
}

/* Track that moves left-right */
.cert-track {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  transition: none;
  transform: none !important;
}

/* Individual certificate cards */
/* Cert card layout with larger image */

.cert-card {
  min-width: 240px;
  max-width: 320px;
  flex: 1 1 260px;
  background-color: #f6f6ff;
  border-radius: 12px;
  padding: 1rem 1rem 1.1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  border: 1px solid rgba(74, 116, 185, 0.15);
  line-height: 1.6;
}

.cert-card:hover {
  box-shadow: 0 12px 24px rgba(74, 116, 185, 0.15);
  transform: translateY(-6px);
  border-color: rgba(74, 116, 185, 0.3);
}

/* Large image holder */
.cert-image-wrap {
  width: 100%;
  height: 190px;              /* bigger preview */
  border-radius: 8px;
  overflow: hidden;
  background-color: #e2e8ff;  /* fallback color */
  margin-bottom: 0.6rem;
  cursor: pointer;
}

.cert-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.cert-image-wrap:hover .cert-image {
  transform: scale(1.2);
}

/* Text */
.cert-title {
  font-size: clamp(0.9rem, 1.2vw, 1rem);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.cert-issuer {
  font-size: clamp(0.85rem, 1vw, 0.9rem);
  color: var(--accent-color);
  margin-bottom: 0.15rem;
}

.cert-meta {
  font-size: clamp(0.8rem, 0.9vw, 0.85rem);
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

/* View link */
.cert-link {
  margin-top: auto;
  align-self: flex-start;
  font-size: clamp(0.8rem, 0.9vw, 0.85rem);
  color: var(--accent-color);
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(74, 116, 185, 0.4);
  text-decoration: none;
  transition: background-color var(--transition-time) ease,
              color var(--transition-time) ease,
              border-color var(--transition-time) ease;
}

.cert-link:hover {
  background-color: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

/* Responsive card width removed per request */

/* About section with robot layout */
#about .about-content {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 2rem;
  align-items: stretch;
}

.about-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 400px;
}

#robot-container {
  width: clamp(240px, 45vw, 400px);
  height: clamp(240px, 45vw, 400px);
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.skills-group {
  background-color: #f6f6ff;
  border-radius: 8px;
  padding: 0.8rem 1rem;
  font-family: inherit;           /* use site font */
}

/* Title button */
.skills-toggle {
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  padding: 0;
  margin: 0 0 0.3rem 0;
  font: inherit;                  /* inherit font family + size */
  font-weight: 600;
  cursor: pointer;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
/* Optional caret icon using ::after */
.skills-toggle::after {
  content: "▾";
  font-size: 0.9em;
  transition: transform 0.25s ease;
}
.skills-toggle:hover {
  text-decoration: underline;
}

.skills-list {
  max-height: 0;
  overflow: hidden;
  list-style: disc inside;
  margin: 0;
  padding-left: 0;
  font-size: 0.95rem;
  transition: max-height 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
  opacity: 0;
  transform: translateY(-4px);
}
.skills-list.is-open {
  max-height: 300px;   /* big enough for your longest list */
  opacity: 1;
  transform: translateY(0);
}
/* Rotate caret when open */
.skills-toggle.is-open::after {
  transform: rotate(180deg);
}
/* Fun certificate modal overlay */
.cert-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.cert-modal.show {
  display: flex;
}

/* Modal content box */
.cert-modal-content {
  background-color: #fff;
  border-radius: 12px;
  padding: 2rem 2.5rem;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  position: relative;
  animation: modalPop 0.3s ease;
}

@keyframes modalPop {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Close button */
.cert-modal-close {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  border: none;
  background: none;
  font-size: 1.8rem;
  color: #666;
  cursor: pointer;
  line-height: 1;
}

.cert-modal-close:hover {
  color: #000;
}

/* Modal text */
.cert-modal-text {
  font-size: 1.15rem;
  margin: 0;
  color: #333;
}