:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --accent: #2563eb;
  --bg-main: #f9fafb;
  --bg-alternate: #f1f5f9;
  --bg-card: #ffffff;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --text-main: #111827;
  --text-muted: #4b5563;
  --border-color: #e5e7eb;
  --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --card-shadow-hover: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
  --gradient: linear-gradient(135deg, #2563eb, #4f46e5);
}

[data-theme="dark"] {
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --accent: #60a5fa;
  --bg-main: #0f172a;
  --bg-alternate: #111827;
  --bg-card: #1e293b;
  --bg-nav: rgba(15, 23, 42, 0.85);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
  --card-shadow-hover: 0 10px 15px -3px rgb(0 0 0 / 0.4);
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  transition: background-color 0.3s ease, color 0.3s ease;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--text-main);
}

/* Navbar */
.navbar {
  background-color: transparent;
  transition: all 0.3s ease-in-out;
  padding: 1rem 0;
}

.navbar-scrolled {
  background-color: var(--bg-nav) !important;
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 0;
}

.navbar-brand {
  color: var(--text-main) !important;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
}

.nav-link {
  color: var(--text-muted) !important;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--primary) !important;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  transition: color 0.3s ease;
}

.theme-toggle:hover {
  color: var(--primary);
}

@media (max-width: 991.98px) {
  .navbar-collapse {
    background-color: var(--bg-nav);
    backdrop-filter: blur(12px);
    padding: 1rem;
    border-radius: 12px;
    margin-top: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
  }
  
  .navbar-collapse .nav-link {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
  }

  .navbar-collapse .nav-item:last-child .nav-link {
    border-bottom: none;
  }
  
  .theme-toggle {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    width: 100%;
    text-align: left;
  }
}

/* Masthead / Hero */
.masthead {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: var(--bg-main);
  padding-top: 5rem;
}

.hero-content {
  text-align: left;
}

.hero-subtitle {
  color: var(--primary);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 600px;
}

/* Buttons */
.btn-primary {
  background: var(--gradient);
  border: none;
  color: white;
  padding: 0.8rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
  color: white;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.8rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-icon {
  margin-right: 0.5rem;
}

/* Base Utility Classes */
.bg-alternate {
  background-color: var(--bg-alternate);
}
.text-muted {
  color: var(--text-muted) !important;
}

/* Sections */
.page-section {
  padding: 6rem 0;
  border-top: 1px solid var(--border-color);
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 3rem;
  text-align: left;
}

/* Components */
.clean-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: var(--card-shadow);
  height: 100%;
}

.clean-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

/* Experience Layout */
.experience-timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.experience-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

@media (min-width: 768px) {
  .experience-item {
    grid-template-columns: 250px 1fr;
  }
}

.experience-item:last-child {
  border-bottom: none;
}

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

.experience-meta img.company-logo {
  max-width: 120px;
  margin-bottom: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: white;
  padding: 0.5rem;
}

.experience-role h4 {
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.experience-role .company {
  color: var(--primary);
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 1rem;
  display: inline-block;
}

.experience-role ul {
  padding-left: 1.2rem;
  color: var(--text-muted);
}

.experience-role li {
  margin-bottom: 0.5rem;
}

/* Projects Bento Grid */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.bento-item {
  display: flex;
  flex-direction: column;
  text-align: left;
  padding: 1.5rem;
}

.bento-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.bento-item h5 {
  margin-bottom: 0.5rem;
}

.bento-item p {
  color: var(--text-muted);
  flex-grow: 1;
}

.bento-item .btn {
  align-self: flex-start;
  margin-top: 1rem;
}

@media (min-width: 992px) {
  .span-2-col {
    grid-column: span 2;
  }
  .span-2-col img {
    height: 350px;
  }
}

/* Certifications Layout */
.certification-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}

.certification-icon {
  background: var(--bg-main);
  padding: 1rem;
  border-radius: 12px;
  color: var(--primary);
  border: 1px solid var(--border-color);
}

.certification-content h5 {
  margin-bottom: 0.25rem;
}

.certification-content p {
  color: var(--text-muted);
  margin: 0;
}

/* Marquee */
.marquee-container {
  overflow: hidden;
  white-space: nowrap;
  position: relative;
  padding: 2rem 0;
  mask-image: linear-gradient(to right, transparent, var(--bg-main) 5%, var(--bg-main) 95%, transparent);
}

.marquee-content {
  display: inline-flex;
  gap: 2rem;
  animation: marquee 30s linear infinite;
  padding-left: 100%;
}

.marquee-content:hover {
  animation-play-state: paused;
}

.skill-item-marquee {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  min-width: 120px;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s;
}

.skill-item-marquee:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
}

.skill-item-marquee img {
  filter: grayscale(100%);
  transition: filter 0.3s;
}

.skill-item-marquee:hover img {
  filter: grayscale(0%);
}

.skill-item-marquee i {
  color: var(--text-muted);
  transition: color 0.3s;
}

.skill-item-marquee:hover i {
  color: var(--primary);
}

.skill-item-marquee strong {
  margin-top: 1rem;
  color: var(--text-main);
  font-weight: 500;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

/* Footer */
.footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 3rem 0;
}

.social-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 1.5rem;
  justify-content: flex-end;
}

.social-links a {
  color: var(--text-muted);
  transition: color 0.2s;
}

.social-links a:hover {
  color: var(--primary);
}

.profile-img {
  width: 100%;
  max-width: 350px;
  border-radius: 24px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-color);
}