/* Global Styles & Base Variables */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary-color: #3b82f6;
  --secondary-color: #6b7280;
  --card-bg-color: #1c1917;
  --border-color: #44403c;
  --bg-color: #ffffff;
  --secondary-bg-color: #F2F2F2;
  --text-color: #111827;
  --text-muted-color: #4b5563;
  --accent-subtle-color: rgba(59,130,246,0.1);
  --accent-foreground-color: #dbeafe;
}

html {
  scroll-behavior: smooth;
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, 'Poppins', sans-serif;
  color: var(--text-color);
  background: var(--bg-color);
}

/* Animations */
@keyframes fade-up { from {opacity:0; transform: translateY(20px);} to {opacity:1; transform: translateY(0);} }
@keyframes bounce {
  0%,20%,50%,80%,100% { transform: translateY(0); }
  40% { transform: translateY(-10px); }
  60% { transform: translateY(-5px); }
}

/* Buttons */
.btn {
  display: flex;
  align-items: center; /* fix: 'cnetre' -> 'center' */
  justify-content: center;
  gap: 0.5rem;
  background: #00A6FB;
  color: var(--bg-color);
  padding: 1rem 2rem;
  border: 2px solid transparent;
  border-radius: 0.5rem;
  font-size: 1.125rem; /* slightly smaller for consistency */
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  margin-top: 1.5rem;
  width: 100%;
  max-width: 300px;
}

.btn:hover { transform: scale(1.05); box-shadow: 0 4px 12px rgba(0,0,0,0.15); background-color: #2563eb; }
.btn-primary { background-color: var(--primary-color); color: var(--bg-color); }
.btn-primary:hover { background-color: #2563eb; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.btn-secondary { background-color: transparent; color: var(--secondary-color); border: 2px solid #e5e7eb; }
.btn-secondary:hover { background-color: #f3f4f6; color: var(--text-color); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.hero-buttons { display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 1rem; }
.btn.outline { background: transparent; border: 2px solid #00A6FB; color: #00A6FB; }
@media (min-width: 640px) { .hero-buttons { flex-direction: row; } .btn { width: auto; } }

/* Hero */
.hero-section {
  min-height: 100vh; display:flex; flex-direction:column; justify-content:center; align-items:center;
  text-align:center; padding:1rem; position:relative;
}
.hero-content { max-width: 56rem; margin: 0 auto; }
.hero-content > * + * { margin-top: 2rem; }
.hero-title { font-size: 3rem; font-weight: 900; letter-spacing: -0.025em; margin-bottom: 1.5rem; }
.hero-subtitle { font-size: 1.25rem; color: var(--text-muted-color); margin-bottom: 1rem; font-weight: 500; }
.hero-tagline { font-size: 1.125rem; color: var(--text-muted-color); }
@media (min-width: 768px) {
  .hero-title { font-size: 4.5rem; }
  .hero-subtitle { font-size: 1.5rem; }
  .hero-tagline { font-size: 1.25rem; }
}
.animate-fade-up { animation: fade-up 1s ease-out forwards; }
.animate-fade-up-delay { animation: fade-up 1s ease-out 0.4s forwards; opacity: 0; }
.scroll-indicator { position:absolute; bottom:2rem; left:50%; transform:translateX(-50%); animation:bounce 2s infinite; font-size:2rem; color: var(--text-muted-color); }

/* About */
.about-section { padding: 5rem 1rem; }
.about-container { max-width: 72rem; margin: 0 auto; }
.about-grid { display: grid; gap: 3rem; align-items: center; }
.headshot-container {
  width: 20rem; height: 20rem; margin: 0 auto; border-radius: 9999px; overflow: hidden;
  border: 4px solid var(--border-color); background-color: var(--card-bg-color); transition: all 500ms ease;
}
.headshot { width: 100%; height: 100%; object-fit: cover; }
.group:hover .headshot-container { border-color: var(--primary-color); }
.about-text { display: flex; flex-direction: column; gap: 1rem; }
.about-heading { font-size: 2rem; line-height: 2.5rem; font-weight: 700; margin-bottom: 2rem; }
.about-paragraphs { font-size: 1.125rem; line-height: 1.75rem; color: var(--text-muted-color); }
@media (min-width:768px){ .about-heading { font-size:3rem; line-height:1; } }
@media (min-width:1024px){ .about-grid { grid-template-columns: repeat(2,1fr); } }

/* Shared container/section header */
.container { max-width: 72rem; margin: 0 auto; }
.section-header { text-align:center; margin-bottom: 4rem; }
.section-title { font-size: 2.25rem; font-weight: 700; margin-bottom: 1.5rem; }
.section-subtitle { font-size: 1.25rem; color: var(--text-muted-color); max-width: 48rem; margin: 0 auto; }

/* Skills */
.skills-section { padding:5rem 1rem; background-color: var(--secondary-bg-color); }
.skills-grid { display:grid; gap:2rem; margin-bottom:4rem; }
.card { background-color: var(--bg-color); border:1px solid #292524; border-radius:.75rem; padding:2rem; transition: transform .3s, box-shadow .3s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
.card-content { display:flex; align-items:flex-start; gap:1rem; }
.card-icon { flex-shrink:0; padding:.75rem; background-color: var(--accent-subtle-color); border-radius:.5rem; font-size:1.5rem; transition: all .3s; }
.card-title { font-size: 1.25rem; font-weight:600; margin-bottom:.5rem; transition: color .3s; }
.card-description { color: var(--text-muted-color); line-height:1.6; }
.group:hover .card-icon { background-color: var(--primary-color); color:#fff; }
.group:hover .card-title { color: var(--primary-color); }
.tech-stack { text-align:center; }
.tech-stack > * + * { margin-top: 2rem; }
.tech-stack-title { font-size:1.125rem; font-weight:600; margin-bottom:1rem; }
.tech-stack-list > * + * { margin-top: 1rem; }
.tech-label { font-weight:500; }
.tech-items { color: var(--text-muted-color); margin-left:.5rem; }
@media (min-width:768px){ .section-title{font-size:3rem;} .skills-grid{ grid-template-columns: repeat(2,1fr);} }

/* Projects */
.projects-section { padding:5rem 1rem; background-color: var(--bg-color); }
.projects-container { display:flex; flex-direction:column; gap:2rem; }
.project-card { background-color:#0c0a09; border-radius:.75rem; border:1px solid #292524; overflow:hidden; transition: transform .3s, box-shadow .3s; }
.project-card:hover { transform: translateY(-5px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
.project-card-inner { padding:2rem; }
.project-header { color:#f2f2f2; display:flex; align-items:flex-start; justify-content:space-between; margin-bottom:1.5rem; }
.project-title-group { display:flex; align-items:center; gap:1rem; }
.project-icon { padding:.75rem; background-color: var(--accent-subtle-color); border-radius:.5rem; font-size:1.5rem; transition: all .3s; }
.project-title { font-size:1.5rem; font-weight:600; transition: color .3s; }
.project-year { color:#a1a1aa; }
.project-links { display:flex; gap:.5rem; }
.project-link-btn { padding:.8rem; border-radius:.5rem; border:1px solid #f6d607; color:#a1a1aa; display:flex; align-items:center; justify-content:center; transition: background-color .3s; }
.project-link-btn:hover { transform: translateY(-5px); box-shadow: 0 8px 24px; background-color:#2563eb; color:#fff; }
.project-description { font-size:1.125rem; color:#a1a1aa; margin-bottom:1.5rem; line-height:1.6; }
.project-highlights { margin-bottom:1.5rem; display:flex; flex-direction:column; gap:.75rem; }
.highlight-item { display:flex; align-items:flex-start; gap:.75rem; color:#a1a1aa; }
.highlight-bullet { width:.5rem; height:.5rem; background-color: var(--primary-color); border-radius:9999px; margin-top:.5rem; flex-shrink:0; }
.project-tags { display:flex; flex-wrap:wrap; gap:.5rem; }
.project-tag { padding:.25rem .75rem; background-color: var(--accent-subtle-color); color: var(--accent-foreground-color); border-radius:9999px; font-size:.875rem; font-weight:500; }
.group:hover .project-icon { background-color: var(--primary-color); color:#fff; }
.group:hover .project-title { color: var(--primary-color); }

/* Education */
.education-section { padding:5rem 1rem; background-color: var(--secondary-bg-color); }
.timeline-container { position:relative; }
.timeline-line { position:absolute; left:2rem; top:0; bottom:0; width:2px; background-color: var(--border-color); }
.timeline-items-wrapper { display:flex; flex-direction:column; gap:3rem; }
.timeline-item { position:relative; display:flex; align-items:flex-start; gap:2rem; }
.timeline-dot {
  flex-shrink:0; width:4rem; height:4rem; background-color: var(--primary-color);
  border-radius:9999px; display:flex; align-items:center; justify-content:center;
  border:4px solid #0c0a09; box-shadow: 0 4px 12px rgba(0,0,0,.2); z-index:1;
}
.timeline-dot i { font-size:1.5rem; color:#fff; }
.timeline-content { flex:1; background-color: var(--bg-color); border-radius:.75rem; padding:2rem; border:1px solid var(--border-color); }
.card-hover { transition: transform .3s, box-shadow .3s; }
.card-hover:hover { transform: translateY(-5px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.content-header { display:flex; flex-direction:column; margin-bottom:1rem; gap:.25rem; }
.institution-name { font-size:1.5rem; font-weight:600; color: var(--text-color); }
.date-info { display:flex; align-items:center; color: var(--text-muted-color); gap:.5rem; }
.degree-name { font-size:1.25rem; font-weight:500; margin-bottom:.75rem; }
.degree-description { color: var(--text-muted-color); line-height:1.6; }
@media (min-width:1024px){ .content-header { flex-direction:row; align-items:center; justify-content:space-between; } }

/* Certifications */
.certifications-section { padding:5rem 1rem; background-color: var(--bg-color); }
.cert-grid { display:grid; gap:2rem; }
.cert-card { background-color: var(--secondary-bg-color); border-radius:.75rem; padding:1.5rem; border:1px solid #292524; transition: transform .3s, box-shadow .3s; }
.cert-card:hover { transform: translateY(-5px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.cert-header { display:flex; align-items:flex-start; justify-content:space-between; margin-bottom:1rem; }
.cert-title-group { display:flex; align-items:center; gap:.75rem; }
.cert-icon { display:flex; align-items:center; justify-content:center; padding:.25rem; background-color: #0c0a09; border-radius:.5rem; font-size:1.25rem; transition: all .3s; color: #f59e0b; }
.cert-icon-regular { display:flex; align-items:center; justify-content:center; padding:.5rem; background-color: var(--accent-subtle-color); border-radius:.5rem; font-size:1.25rem; transition: all .3s; }
.cert-icon-red { display:flex; align-items:center; justify-content:center; padding:.5rem; background-color: var(--accent-subtle-color); border-radius:.5rem; font-size:1.25rem; transition: all .3s; color: #dc2626; }
.cert-icon-green { display:flex; align-items:center; justify-content:center; padding:.5rem; background-color: var(--accent-subtle-color); border-radius:.5rem; font-size:1.25rem; transition: all .3s; color: #16a34a; }
.cert-title { font-size:1.125rem; font-weight:600; transition: color .3s; }
.cert-issuer { font-size:.875rem; color: var(--text-color); }
.cert-link-btn { padding:.5rem; border-radius:.5rem; border:1px solid var(--border-color); color: var(--text-muted-color); background:transparent; cursor:pointer; transition: all .3s; }
.cert-description { color: var(--text-muted-color); margin-bottom:1rem; line-height:1.6; }
.cert-tags { display:flex; flex-wrap:wrap; gap:.5rem; }
.tag { padding:.25rem .5rem; background-color: rgb(219,234,254); color: rgb(59,130,246); border-radius:.25rem; font-size:.75rem; font-weight:500; }
.group:hover .cert-icon { background-color: var(--primary-color); color:#fff; }
.group:hover .cert-title { color: var(--primary-color); }
.group:hover .cert-link-btn { opacity:1; }
.cert-link-btn:hover { background-color:#2563eb; color:#fff; }
@media (min-width:768px){ .cert-grid { grid-template-columns: repeat(2,1fr); } }

/* Contact (fix: your HTML now uses .contact-section) */
.contact-section { background-color: var(--bg-color); padding:5rem 1rem; position:relative; z-index:10; }
.contact-container { max-width:1100px; margin:0 auto; padding:0 1rem; }
.contact-grid { display:grid; gap:3rem; }
@media (min-width:1024px){ .contact-grid { grid-template-columns: repeat(2,1fr); } }
.section-header h2 { color: var(--text-color); font-size:2.25rem; font-weight:700; margin-bottom:3rem; }
@media (min-width:768px){ .section-header h2 { font-size:3rem; } }
.form-wrapper, .info-wrapper { background-color:#0c0a09; border:1px solid #292524; border-radius:.75rem; padding:2rem; }
.form-wrapper h3, .info-wrapper h3 { color:#fff; font-size:1.5rem; font-weight:600; margin-bottom:1.5rem; }
.contact-form .form-group { margin-bottom:1.5rem; }
.form-group label { color:var(--secondary-bg-color); display:block; font-size:.875rem; font-weight:500; margin-bottom:.5rem; }
.form-group label span { color:#a1a1aa; }
.form-group input, .form-group textarea {
  width:100%; background-color:#292524; border:1px solid #44403c; border-radius:.5rem; padding:.75rem 1rem;
  color:#f2f2f2; font-size:1rem; transition: border-color .3s;
}
.form-group textarea { resize:none; }
.form-group input:focus, .form-group textarea:focus { outline:none; border-color:#3b82f6; }
.info-wrapper { display:flex; flex-direction:column; gap:3rem; }
.contact-info, .social-info { display:flex; flex-direction:column; gap:1.5rem; }
.info-item { display:flex; align-items:center; gap:1rem; }
.info-icon-bg { background-color: rgba(59,130,246,.1); padding:.75rem; border-radius:.5rem; display:flex; align-items:center; justify-content:center; }
.icon { font-size:20px; color:#3b82f6; }
.icon-gmail { font-size:20px; color:#D44638; }
.info-label { color:var(--secondary-bg-color); font-weight:600; }
.info-link { color:#3b82f6; text-decoration:none; }
.info-link:hover { text-decoration:underline; }
.social-grid { display:grid; grid-template-columns: repeat(auto-fit, minmax(140px,1fr)); gap:1rem; }
.social-link { display:flex; align-items:center; gap:.75rem; padding:1rem; background-color: rgb(30,30,30); border-radius:.5rem; transition: all .5s; color:#fff; }
.social-link:hover { background-color:#3b82f6; color:#fff; }
.social-icon-linkedin { font-size:20px; color:#0a66c2; }
.social-icon-github { font-size:20px; color:#ffffff; }
.social-icon-kaggle { font-size:20px; color:#20beff; }
.social-icon-instagram { font-size:20px; color:#d62976; }
.social-icon-x { font-size:20px; color:#ffffff; }
.social-icon-youtube { font-size:20px; color:#FF0000; }
.social-label { color:var(--secondary-bg-color); font-size:.875rem; font-weight:500; }

/* Footer */
.footer { color: var(--text-color); text-align:center; padding:40px 20px; border-top:1px solid #eee; font-size:1rem; }