/* ============================================================
   SUMIT VERMA — Portfolio Stylesheet
   Premium dark-theme with cyan accent & glassmorphism
   ============================================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Core palette */
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --bg-card: rgba(15, 15, 15, 0.6);
  --bg-card-hover: rgba(25, 25, 25, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);

  /* Accent (Default: Cyan) */
  --accent: #38bdf8;
  --accent-dim: rgba(56, 189, 248, 0.15);
  --accent-glow: rgba(56, 189, 248, 0.25);
  --accent-gradient: linear-gradient(135deg, #38bdf8, #818cf8);

  /* Text */
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;
  --text-accent: #34d399;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);

  /* Structural BG */
  --nav-bg: rgba(0, 0, 0, 0.7);
  --menu-bg: rgba(0, 0, 0, 0.95);

  /* Spacing & sizing */
  --max-width: 1000px;
  --section-gap: 120px;
  --nav-height: 70px;

  /* Transitions */
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- Preloader ---------- */
.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999999;
  transition: opacity 0.6s var(--ease-smooth), visibility 0.6s;
}
.preloader.hidden {
  opacity: 0;
  visibility: hidden;
}
.preloader-logo {
  font-size: 3rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: pulseLogo 1s ease-in-out infinite alternate;
}
@keyframes pulseLogo {
  0% { transform: scale(1); filter: drop-shadow(0 0 10px var(--accent-glow)); }
  100% { transform: scale(1.1); filter: drop-shadow(0 0 30px var(--accent)); }
}

body.light-mode {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-glass: rgba(0, 0, 0, 0.04);
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border-subtle: rgba(15, 23, 42, 0.1);
  --nav-bg: rgba(248, 250, 252, 0.85);
  --menu-bg: rgba(248, 250, 252, 0.95);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
}

/* Ambient background glow */
body::before {
  content: '';
  position: fixed;
  top: -40%;
  left: -20%;
  width: 70%;
  height: 70%;
  background: radial-gradient(ellipse, rgba(56, 189, 248, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  bottom: -30%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(129, 140, 248, 0.03) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

a {
  color: var(--text-accent);
  text-decoration: none;
  transition: color 0.3s var(--ease-smooth);
}

a:hover {
  color: #7dd3fc;
}

ul { list-style: none; }

img {
  max-width: 100%;
  display: block;
}

/* ---------- Custom Selection ---------- */
::selection {
  background: var(--accent);
  color: var(--bg-primary);
  text-shadow: none;
}
::-moz-selection {
  background: var(--accent);
  color: var(--bg-primary);
  text-shadow: none;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ---------- Navigation ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 48px;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(1.8);
  -webkit-backdrop-filter: blur(20px) saturate(1.8);
  border-bottom: 1px solid var(--border-subtle);
  transition: transform 0.35s var(--ease-smooth), box-shadow 0.35s var(--ease-smooth);
}

.navbar.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-logo {
  font-size: 1.35rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.3s var(--ease-smooth);
  position: relative;
}

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

.nav-links .resume-btn {
  color: var(--accent);
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  padding: 8px 20px;
  margin-left: 8px;
  font-weight: 600;
  transition: all 0.3s var(--ease-smooth);
}

.nav-links .resume-btn:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* Mobile Nav Controls */
.mobile-nav-controls {
  display: none;
}
.native-share-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  transition: color 0.3s var(--ease-smooth);
}
.native-share-btn:hover {
  color: var(--accent);
}

/* ---------- Main Content ---------- */
main {
  position: relative;
  z-index: 1;
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Hero Section ---------- */
.hero {
  min-height: clamp(500px, 85vh, 800px);
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
}

.hero-content {
  max-width: 720px;
}

.hero-greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s var(--ease-smooth) 0.2s forwards;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  
  /* Animated Gradient Text */
  background: linear-gradient(
    to right, 
    var(--text-primary) 20%, 
    var(--accent) 40%, 
    var(--accent) 60%, 
    var(--text-primary) 80%
  );
  background-size: 200% auto;
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
  animation: shine 6s linear infinite, fadeInUp 0.6s var(--ease-smooth) 0.35s forwards;

  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  opacity: 0;
  transform: translateY(20px);
}

@keyframes shine {
  to {
    background-position: 200% center;
  }
}

.hero-title {
  font-size: clamp(1.5rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s var(--ease-smooth) 0.5s forwards;
  background: linear-gradient(135deg, var(--text-secondary) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.1rem;
  max-width: 540px;
  margin-bottom: 40px;
  line-height: 1.8;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s var(--ease-smooth) 0.65s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.35s var(--ease-smooth);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s var(--ease-smooth) 0.8s forwards;
}

.hero-cta:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-2px);
}

.hero-cta svg {
  transition: transform 0.3s var(--ease-smooth);
}

.hero-cta:hover svg {
  transform: translateX(4px);
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  animation: fadeInUpScroll 0.6s var(--ease-smooth) 1.2s forwards;
}

@keyframes fadeInUpScroll {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.scroll-indicator span {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* ---------- Section Headers ---------- */
.section-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}

.section-number {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.section-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border-subtle), transparent);
  max-width: 300px;
}

/* ---------- About Section ---------- */
#about {
  padding-top: var(--section-gap);
}

.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  margin-bottom: 14px;
  font-size: 0.93rem;
}

.about-tech-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 16px;
  margin-top: 20px;
}

.about-tech-list li {
  font-size: 0.82rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.about-tech-list li::before {
  content: '▹';
  color: var(--accent);
  font-size: 0.75rem;
}

.about-image-wrapper {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  max-width: 320px;
}

.about-image-wrapper::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent);
  border-radius: 12px;
  transform: translate(10px, 10px);
  z-index: -1;
  transition: transform 0.4s var(--ease-smooth);
}

.about-image-wrapper:hover::before {
  transform: translate(6px, 6px);
}

.about-image-wrapper img {
  border-radius: 12px;
  filter: grayscale(20%) contrast(1.05);
  transition: filter 0.4s var(--ease-smooth);
}

.about-image-wrapper:hover img {
  filter: grayscale(0%) contrast(1);
}

/* Overlay tint */
.about-image-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.08);
  transition: background 0.4s var(--ease-smooth);
}

.about-image-wrapper:hover::after {
  background: transparent;
}

/* ---------- Experience Section ---------- */
#experience {
  padding-top: var(--section-gap);
}

.experience-timeline {
  position: relative;
  padding-left: 40px;
}

.experience-timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border-subtle), transparent);
  border-radius: 1px;
}

.experience-item {
  position: relative;
  margin-bottom: 40px;
  padding: 22px 26px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  transition: all 0.4s var(--ease-smooth);
}

.experience-item:last-child {
  margin-bottom: 0;
}

.experience-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateX(4px);
  box-shadow: 0 8px 32px rgba(56, 189, 248, 0.06);
}

/* Timeline dot */
.experience-item::before {
  content: '';
  position: absolute;
  left: -47px;
  top: 28px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2.5px solid var(--accent);
  transition: all 0.3s var(--ease-smooth);
}

.experience-item:hover::before {
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* Connector line from dot to card */
.experience-item::after {
  content: '';
  position: absolute;
  left: -35px;
  top: 33px;
  width: 35px;
  height: 1px;
  background: var(--border-subtle);
  transition: background 0.3s var(--ease-smooth);
}

.experience-item:hover::after {
  background: var(--accent);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 8px;
}

.experience-role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.experience-company {
  color: var(--accent);
  font-weight: 600;
  display: block;
}

.experience-date {
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--text-muted);
  white-space: nowrap;
}

.experience-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 16px;
}

.experience-tech span {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 500;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.experience-bullets {
  list-style: none;
}

.experience-bullets li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 0.85rem;
  line-height: 1.65;
}

.experience-bullets li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
}

/* ---------- Skills Section ---------- */
#skills {
  padding-top: var(--section-gap);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.skill-card {
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  backdrop-filter: blur(10px);
  transition: all 0.4s var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease-smooth);
}

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

.skill-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(56, 189, 248, 0.06);
}

.skill-card-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: 8px;
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 1.1rem;
}

.skill-card h3 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.skill-card ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-card ul li {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  transition: all 0.3s var(--ease-smooth);
}

.skill-card:hover ul li {
  border-color: rgba(56, 189, 248, 0.15);
}

/* ---------- Projects Section ---------- */
#projects {
  padding-top: var(--section-gap);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 22px 24px;
  backdrop-filter: blur(10px);
  transition: all 0.4s var(--ease-smooth);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.4s var(--ease-smooth);
}

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

.project-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(56, 189, 248, 0.07);
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 10px;
}

.project-folder-icon {
  color: var(--accent);
  font-size: 1.5rem;
}

.project-links {
  display: flex;
  gap: 10px;
}

.project-links a {
  color: var(--text-muted);
  transition: color 0.3s var(--ease-smooth);
  display: flex;
  align-items: center;
}

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

.project-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  transition: color 0.3s var(--ease-smooth);
}

.project-card:hover h3 {
  color: var(--accent);
}

.project-card p {
  font-size: 0.84rem;
  line-height: 1.65;
  flex: 1;
  margin-bottom: 14px;
}

.project-tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.project-tech-list span {
  font-size: 0.7rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--text-muted);
  transition: color 0.3s var(--ease-smooth);
}

.project-card:hover .project-tech-list span {
  color: var(--text-secondary);
}

/* ---------- Certificates Carousel ---------- */
#certificates {
  padding-top: var(--section-gap);
}

.carousel-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.carousel-viewport {
  overflow: hidden;
  border-radius: 12px;
  flex: 1;
}

.carousel-track {
  display: flex;
  gap: 16px;
  transition: transform 0.55s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
}

.carousel-track .cert-card {
  min-width: calc((100% - 32px) / 3);
  flex-shrink: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  transition: all 0.4s var(--ease-smooth);
  cursor: pointer;
  height: 160px;
}

.carousel-track .cert-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.08);
}

.carousel-track .cert-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.4s var(--ease-smooth);
}

.carousel-track .cert-card:hover img {
  transform: scale(1.05);
}

.carousel-btn {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--ease-smooth);
  backdrop-filter: blur(10px);
}

.carousel-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  box-shadow: 0 0 16px var(--accent-glow);
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: all 0.3s var(--ease-smooth);
  padding: 0;
}

.carousel-dot.active {
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  width: 24px;
  border-radius: 4px;
}

.carousel-dot:hover:not(.active) {
  background: var(--text-secondary);
}

/* ---------- Contact Section ---------- */
#contact {
  padding-top: var(--section-gap);
  padding-bottom: var(--section-gap);
  text-align: center;
}

.contact-overline {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  margin-bottom: 10px;
}

.contact-heading {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.contact-text {
  max-width: 480px;
  margin: 0 auto 32px;
  font-size: 0.95rem;
  line-height: 1.75;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 32px;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.35s var(--ease-smooth);
  cursor: pointer;
  background: transparent;
  font-family: 'Inter', sans-serif;
}

.contact-btn:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-2px);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--border-subtle);
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-socials a {
  color: var(--text-muted);
  transition: all 0.3s var(--ease-smooth);
  display: flex;
  align-items: center;
}

.footer-socials a:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

.footer p {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.footer p a {
  color: var(--text-secondary);
}

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

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}

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

/* Staggered children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease-smooth), transform 0.5s var(--ease-smooth);
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.05s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.15s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.25s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(7) { transition-delay: 0.35s; }
.stagger-children.visible > *:nth-child(8) { transition-delay: 0.4s; }

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Toast Notifications ---------- */
.toast-container {
  position: fixed;
  top: 90px;
  right: 24px;
  z-index: 9999;
}

.toast {
  padding: 12px 24px;
  border-radius: 10px;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-hover);
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 500;
  backdrop-filter: blur(10px);
  animation: toastIn 0.4s var(--ease-bounce), toastOut 0.4s var(--ease-smooth) 2.5s forwards;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(40px); }
}

/* ---------- Cursor glow (optional enhancement) ---------- */
.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.04) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
  transition: transform 0.15s ease-out;
  transform: translate(-50%, -50%);
  display: none;
}

/* ---------- Mobile Menu Overlay ---------- */
.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: var(--menu-bg);
  backdrop-filter: blur(10px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.35s var(--ease-smooth);
}

.mobile-menu-overlay.active {
  display: flex;
  opacity: 1;
}

.mobile-menu-overlay nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.mobile-menu-overlay nav a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 8px 24px;
  transition: color 0.3s var(--ease-smooth);
}

.mobile-menu-overlay nav a:hover {
  color: var(--accent);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 1000;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-image-wrapper {
    max-width: 340px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  :root {
    --section-gap: 80px;
    --nav-height: 60px;
  }

  .hero {
    min-height: clamp(400px, 85vh, 700px);
    overflow: hidden;
  }

  .scroll-indicator {
    display: none;
  }

  /* Glowing ambient orb for empty top-right space */
  .hero::after {
    content: '';
    position: absolute;
    top: 5%;
    right: -10%;
    width: 250px;
    height: 250px;
    background: var(--accent);
    filter: blur(80px);
    opacity: 0.15;
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
    animation: pulseOrb 6s ease-in-out infinite;
  }

  @keyframes pulseOrb {
    0%, 100% { transform: scale(1) translate(0, 0); opacity: 0.15; }
    50% { transform: scale(1.1) translate(-20px, 20px); opacity: 0.25; }
  }

  #about {
    position: relative;
  }

  #about .section-header {
    padding-right: 80px;
  }

  .about-grid {
    display: flex;
    flex-direction: column-reverse;
  }

  .about-image-wrapper {
    position: absolute;
    top: 80px;
    right: 24px;
    width: 65px;
    height: 65px;
    margin: 0;
    max-width: none;
    border-radius: 50%;
    border: 2px solid var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
    z-index: 5;
  }

  .about-image-wrapper::before,
  .about-image-wrapper::after {
    display: none;
  }

  .about-image-wrapper img {
    border-radius: 50%;
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: none;
  }

  .navbar {
    padding: 0 24px;
  }

  .nav-links {
    display: none;
  }

  .hero-content {
    padding: 0 8px;
  }

  .section-header {
    margin-bottom: 36px;
  }

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

  .experience-timeline {
    padding-left: 24px;
  }

  .experience-item {
    padding: 20px;
  }

  .experience-item::before {
    left: -31px;
    width: 10px;
    height: 10px;
  }

  .experience-item::after {
    left: -21px;
    width: 21px;
  }

  .experience-header {
    flex-direction: column;
  }

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

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .carousel-track .cert-card {
    min-width: calc((100% - 16px) / 2);  /* 2 on tablet */
  }

  .cursor-glow {
    display: none !important;
  }
}

@media (max-width: 480px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }

  .about-tech-list {
    grid-template-columns: 1fr;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .carousel-track .cert-card {
    min-width: 100%;  /* 1 on mobile */
  }
}

/* ---------- Stats Section ---------- */
#stats {
  padding-top: 80px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  transition: all 0.4s var(--ease-smooth);
}

.stat-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.06);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  line-height: 1;
}

.stat-text {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  line-height: 1.2;
  display: block;
  margin-bottom: 4px;
}

.stat-suffix {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
  .stat-number {
    font-size: 1.8rem;
  }
}

/* ---------- Scroll Progress Bar ---------- */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent);
  width: 0%;
  z-index: 99999;
  box-shadow: 0 0 10px var(--accent-glow);
  transition: width 0.1s ease-out;
}

/* ---------- Custom Scrollbar ---------- */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-card-hover);
  border-radius: 10px;
  border: 2px solid var(--bg-main);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ---------- Terminal Easter Egg ---------- */
.terminal-open-btn {
  position: fixed;
  bottom: 28px;
  left: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-subtle);
  color: var(--accent);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  backdrop-filter: blur(12px);
  transition: all 0.3s var(--ease-smooth);
}
.terminal-open-btn:hover {
  transform: scale(1.1);
  border-color: var(--accent);
  box-shadow: 0 4px 24px var(--accent-glow);
}

.terminal-overlay {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease-smooth);
}
.terminal-overlay.show {
  opacity: 1;
  pointer-events: all;
}

.terminal-window {
  width: 90%;
  max-width: 700px;
  height: 400px;
  background: rgba(10, 15, 29, 0.95);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px) scale(0.95);
  transition: transform 0.3s var(--ease-bounce);
}
.terminal-overlay.show .terminal-window {
  transform: translateY(0) scale(1);
}

.terminal-header {
  height: 32px;
  background: rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 8px;
  position: relative;
}
.term-btn {
  width: 12px; height: 12px; border-radius: 50%; cursor: pointer;
}
.term-close { background: #ff5f56; }
.term-min { background: #ffbd2e; }
.term-max { background: #27c93f; }
.term-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: #888;
}

.terminal-body {
  flex: 1;
  padding: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: #a9b7c6;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.term-line {
  line-height: 1.4;
  word-break: break-all;
}
.term-input-container {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}
.term-prompt {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}
.term-input-container input {
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-family: inherit;
  font-size: inherit;
  flex: 1;
}

/* ---------- Theme Switcher ---------- */

.theme-switcher {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 1000;
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  gap: 8px;
}

.theme-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card-hover);
  color: var(--accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px);
  transition: all 0.3s var(--ease-smooth);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 24px var(--accent-glow);
  transform: scale(1.1);
}

.theme-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
  opacity: 0;
  transform: translateY(10px) scale(0.8);
  pointer-events: none;
  transition: all 0.3s var(--ease-bounce);
}

.theme-switcher.open .theme-options {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}
.theme-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.25s var(--ease-smooth);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  padding: 0;
}
.theme-dot:hover {
  transform: scale(1.25);
  border-color: white;
}
.theme-dot.active {
  border-color: white;
  transform: scale(1.15);
  box-shadow: 0 0 12px currentColor;
}

/* ---------- Color Themes ---------- */
/* Default: Cyan (no override needed) */

[data-theme="emerald"] {
  --accent: #34d399;
  --accent-dim: rgba(52, 211, 153, 0.15);
  --accent-glow: rgba(52, 211, 153, 0.25);
  --accent-gradient: linear-gradient(135deg, #34d399, #6ee7b7);
  --text-accent: #34d399;
  --border-hover: rgba(52, 211, 153, 0.3);
}

[data-theme="purple"] {
  --accent: #a78bfa;
  --accent-dim: rgba(167, 139, 250, 0.15);
  --accent-glow: rgba(167, 139, 250, 0.25);
  --accent-gradient: linear-gradient(135deg, #a78bfa, #c084fc);
  --text-accent: #a78bfa;
  --border-hover: rgba(167, 139, 250, 0.3);
}

[data-theme="rose"] {
  --accent: #fb7185;
  --accent-dim: rgba(251, 113, 133, 0.15);
  --accent-glow: rgba(251, 113, 133, 0.25);
  --accent-gradient: linear-gradient(135deg, #fb7185, #f472b6);
  --text-accent: #fb7185;
  --border-hover: rgba(251, 113, 133, 0.3);
}

[data-theme="amber"] {
  --accent: #fbbf24;
  --accent-dim: rgba(251, 191, 36, 0.15);
  --accent-glow: rgba(251, 191, 36, 0.25);
  --accent-gradient: linear-gradient(135deg, #fbbf24, #f59e0b);
  --text-accent: #fbbf24;
  --border-hover: rgba(251, 191, 36, 0.3);
}

.theme-tooltip {
  position: fixed;
  bottom: 35px;
  right: 85px;
  background: var(--accent);
  color: #000;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 999;
  box-shadow: 0 4px 12px var(--accent-glow);
  opacity: 0;
  transform: translateX(20px);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}
.theme-tooltip::after {
  content: '';
  position: absolute;
  top: 50%;
  right: -6px;
  transform: translateY(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: transparent transparent transparent var(--accent);
}
.theme-tooltip.show {
  opacity: 1;
  transform: translateX(0);
}