/* ===== Elegant Professional Theme ===== */
@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');

:root {
  --bg: #fafaf9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --text: #1a1a2e;
  --text-body: #4a4a5a;
  --text-muted: #7a7a8a;
  --accent: #1e3a5f;
  --accent-light: #2a5080;
  --gold: #c9a84c;
  --gold-light: #d4b85e;
  --border: #e8e8e8;
  --border-hover: #d0d0d0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  background: var(--bg);
  color: var(--text-body);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
}

::selection {
  background: var(--accent);
  color: #fff;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  color: var(--text);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.5px;
}

.nav-brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
}

/* ===== Main Container ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
  min-height: 50vh;
}

section:first-of-type {
  padding-top: 7rem;
}

/* ===== Section Headings ===== */
.section-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border), transparent);
  margin-left: 1rem;
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 60px;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: center;
  width: 100%;
}

.hero-text .greeting {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  font-weight: 400;
}

.hero-text h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  color: var(--text);
  margin-bottom: 0.8rem;
  font-weight: 700;
}

.typing-wrapper {
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
  min-height: 2em;
  font-weight: 500;
}

.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-summary {
  color: var(--text-body);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  max-width: 600px;
}

.hero-designation {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

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

.hero-photo {
  text-align: center;
}

.hero-photo img {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 3px solid var(--border);
  box-shadow: var(--shadow);
  object-fit: cover;
}

/* Social Links */
.social-links {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.2s;
}

.social-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: 6px;
  color: #fff;
  background: var(--accent);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn:hover {
  background: var(--accent-light);
  box-shadow: var(--shadow-hover);
  color: #fff;
  transform: translateY(-1px);
}

/* Badges */
.badges {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.badge-cert {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
  object-fit: contain;
  background: #fff;
  padding: 4px;
}

.badge-cert:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-hover);
}

/* Skill Bars */
.soft-skills {
  margin-top: 1.5rem;
}

.skill-bar {
  margin-bottom: 0.8rem;
}

.skill-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.skill-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 1s ease;
  width: 0;
}

.skill-bar-fill.blue { background: var(--accent); }
.skill-bar-fill.yellow { background: var(--gold); }
.skill-bar-fill.green { background: #4a9e6e; }

/* ===== Cards Grid (Skills) ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.2rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: all 0.3s;
  box-shadow: var(--shadow);
}

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

.card-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
}

.card-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 6px;
}

.card h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
}

.card p {
  font-size: 0.85rem;
  color: var(--text-body);
  line-height: 1.6;
}

/* ===== Timeline (Experience / Education) ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

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

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.35rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  background: var(--gold);
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--gold);
}

.timeline-company {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.timeline-company a {
  color: var(--text);
}

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

.timeline-location {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.timeline-role {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.2rem;
  margin-top: 1rem;
}

.timeline-item > .timeline-role:first-of-type {
  margin-top: 0;
}

.timeline-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.timeline-responsibilities {
  list-style: none;
  padding: 0;
}

.timeline-responsibilities li {
  font-size: 0.85rem;
  color: var(--text-body);
  padding-left: 1.2rem;
  position: relative;
  margin-bottom: 0.3rem;
}

.timeline-responsibilities li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--gold);
}

.timeline-grade {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.timeline-pubs {
  margin-top: 0.5rem;
  list-style: none;
}

.timeline-pubs li {
  font-size: 0.82rem;
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.3rem;
}

.timeline-pubs li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ===== Publications ===== */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.pub-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  transition: all 0.3s;
}

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

.pub-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.pub-venue {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.pub-authors {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
}

/* ===== Blog Preview (index.html) ===== */
.blog-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.blog-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.4rem;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  transition: all 0.3s;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.blog-card-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.blog-card-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.blog-card-desc {
  font-size: 0.85rem;
  color: var(--text-body);
  flex: 1;
}

.blog-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.8rem;
}

.tag {
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
  font-weight: 500;
  transition: all 0.2s;
}

.tag:hover,
.tag.active {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(201, 168, 76, 0.08);
  cursor: pointer;
}

.view-all {
  text-align: center;
}

/* ===== Blog Listing Page (blog.html) ===== */
.blog-header {
  padding-top: 7rem;
  margin-bottom: 2rem;
}

.blog-search {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.blog-search input {
  flex: 1;
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.blog-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.blog-search input::placeholder {
  color: var(--text-muted);
}

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 2rem;
}

.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.blog-list-item {
  display: block;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  transition: all 0.3s;
  text-decoration: none;
}

.blog-list-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  color: inherit;
}

.blog-list-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.3rem;
}

.blog-list-item-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
}

.blog-list-item-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  margin-left: 1rem;
}

.blog-list-item-desc {
  font-size: 0.85rem;
  color: var(--text-body);
}

.no-results {
  color: var(--text-muted);
  text-align: center;
  padding: 3rem;
  font-size: 0.9rem;
}

/* ===== Single Post Page (post.html) ===== */
.post-header {
  padding-top: 7rem;
  margin-bottom: 2rem;
}

.post-back {
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  display: inline-block;
  font-weight: 500;
}

.post-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  color: var(--text);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.post-meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.post-content {
  line-height: 1.9;
  color: var(--text-body);
  font-size: 1rem;
}

.post-content h1, .post-content h2, .post-content h3,
.post-content h4, .post-content h5, .post-content h6 {
  font-family: var(--font-heading);
  color: var(--text);
  margin: 2rem 0 0.8rem;
  font-weight: 600;
}

.post-content h2 { font-size: 1.5rem; }
.post-content h3 { font-size: 1.2rem; }
.post-content h4 { font-size: 1.05rem; }

.post-content p {
  margin-bottom: 1rem;
}

.post-content ul, .post-content ol {
  margin: 0.8rem 0 0.8rem 1.5rem;
}

.post-content li {
  margin-bottom: 0.3rem;
}

.post-content code {
  background: #f0f0f0;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--accent);
  font-family: 'Fira Code', 'Source Code Pro', 'Courier New', monospace;
}

.post-content pre {
  background: #1a1a2e;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem;
  overflow-x: auto;
  margin: 1.2rem 0;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: #d4d4d4;
}

.post-content blockquote {
  border-left: 3px solid var(--gold);
  padding: 0.6rem 1.2rem;
  margin: 1rem 0;
  color: var(--text-muted);
  background: rgba(201, 168, 76, 0.05);
  border-radius: 0 6px 6px 0;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(30, 58, 95, 0.3);
  text-underline-offset: 2px;
}

.post-content a:hover {
  text-decoration-color: var(--accent);
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.post-content th, .post-content td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.8rem;
  text-align: left;
  font-size: 0.88rem;
}

.post-content th {
  background: var(--bg);
  color: var(--text);
  font-weight: 600;
}

.post-content img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    gap: 0.8rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-photo {
    order: -1;
  }

  .hero-text h1 {
    font-size: 1.8rem;
  }

  .social-links {
    justify-content: center;
  }

  .badges {
    justify-content: center;
  }

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

  .blog-preview-grid {
    grid-template-columns: 1fr;
  }

  .blog-list-item-header {
    flex-direction: column;
  }

  .blog-list-item-date {
    margin-left: 0;
  }

  .post-title {
    font-size: 1.4rem;
  }

  section {
    padding: 3rem 0;
  }

  .hero {
    min-height: auto;
    padding-top: 5rem;
    padding-bottom: 2rem;
  }
}

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

  .container {
    padding: 0 1rem;
  }

  .hero-photo img {
    width: 160px;
    height: 160px;
  }
}

/* ===== Utility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* Loading spinner for blog */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.loading::after {
  content: '...';
  animation: dots 1.5s steps(3, end) infinite;
}

@keyframes dots {
  0% { content: '.'; }
  33% { content: '..'; }
  66% { content: '...'; }
}