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

:root {
  --black: #09090B;
  --gray-900: #18181B;
  --gray-700: #3F3F46;
  --gray-500: #71717A;
  --gray-300: #D4D4D8;
  --gray-100: #F4F4F5;
  --gray-50: #FAFAFA;
  --white: #FFFFFF;
  --accent: #2563EB;
  --border: #E4E4E7;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Archivo', sans-serif;
  --nav-h: 64px;
  --max-w: 1200px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--white);
  color: var(--gray-900);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; height: auto; }

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 24px;
}

.nav-inner {
  max-width: var(--max-w);
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-initials {
  width: 36px; height: 36px;
  background: var(--black);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 13px;
  font-weight: 700;
  transition: transform 0.2s;
}

.logo-wrap:hover .logo-initials { transform: rotate(-4deg) scale(1.05); }

.logo-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--black);
  position: relative;
}

.logo-name::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 1.5px;
  background: var(--black);
  transition: width 0.35s ease;
}

.logo-wrap:hover .logo-name::after { width: 100%; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--gray-500);
  padding: 6px 12px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--black); background: var(--gray-100); }

.nav-cta {
  background: var(--black) !important;
  color: var(--white) !important;
  padding: 8px 18px !important;
  border-radius: 8px !important;
}

.nav-cta:hover { opacity: 0.85 !important; background: var(--black) !important; }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px; height: 44px;
  background: transparent;
  border: 1.5px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  padding: 8px;
  transition: background 0.25s, border-color 0.25s, transform 0.2s;
}

.hamburger:hover {
  background: var(--gray-100);
  border-color: var(--border);
  transform: scale(1.05);
}

.hamburger:hover .ham-line:nth-child(1) { width: 18px; }
.hamburger:hover .ham-line:nth-child(3) { width: 18px; }

.ham-line {
  width: 22px; height: 2px;
  background: var(--black);
  border-radius: 2px;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
}

.hamburger.open .ham-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  width: 22px;
}

.hamburger.open .ham-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.open .ham-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  width: 22px;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
  flex-direction: column;
  gap: 4px;
  z-index: 999;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-700);
  padding: 12px 14px;
  border-radius: 8px;
  transition: background 0.2s, transform 0.2s;
  opacity: 0;
  transform: translateY(-8px);
}

.mobile-menu.open a {
  animation: menuSlide 0.35s ease forwards;
}

.mobile-menu.open a:nth-child(1) { animation-delay: 0.05s; }
.mobile-menu.open a:nth-child(2) { animation-delay: 0.1s; }
.mobile-menu.open a:nth-child(3) { animation-delay: 0.15s; }
.mobile-menu.open a:nth-child(4) { animation-delay: 0.2s; }
.mobile-menu.open a:nth-child(5) { animation-delay: 0.25s; }
.mobile-menu.open a:nth-child(6) { animation-delay: 0.3s; }
.mobile-menu.open a:nth-child(7) { animation-delay: 0.35s; }
.mobile-menu.open a:nth-child(8) { animation-delay: 0.4s; }
.mobile-menu.open a:nth-child(9) { animation-delay: 0.45s; }

@keyframes menuSlide {
  to { opacity: 1; transform: translateY(0); }
}

.mobile-menu a:hover { background: var(--gray-50); color: var(--black); }

section { padding: 64px 24px; }
.container { max-width: var(--max-w); margin: 0 auto; }

.section-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 52px);
  color: var(--black);
  line-height: 1.1;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--gray-500);
  max-width: 540px;
  margin-bottom: 36px;
}

#hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: 0 24px;
  padding-top: calc(var(--nav-h) + 16px);
  position: relative;
  overflow: hidden;
}

.hero-wave .wave-path,
.wave-animated .wave-path,
.title-wave .wave-path,
.section-wave-center path {
  animation: waveColorCycle 8s ease-in-out infinite;
}

@keyframes waveColorCycle {
  0%   { stroke: #F5C518; }
  20%  { stroke: #2563EB; }
  40%  { stroke: #7C3AED; }
  60%  { stroke: #06B6D4; }
  80%  { stroke: #EF4444; }
  100% { stroke: #F5C518; }
}

#hero::before {
  content: '';
  position: absolute;
  top: -20%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 24px;
}

.hero-eyebrow::before {
  content: '';
  width: 20px; height: 1px;
  background: var(--accent);
}

.hero-h1 {
  font-family: var(--font-display);
  font-size: clamp(48px, 5vw, 72px);
  color: var(--black);
  line-height: 1.05;
  margin-bottom: 20px;
}

.hero-name-animated .char {
  display: inline-block;
  opacity: 0;
  transform: translateY(20px);
  animation: charIn 0.5s ease forwards;
}

@keyframes charIn { to { opacity: 1; transform: translateY(0); } }

.hero-role {
  font-size: 17px;
  color: var(--gray-500);
  margin-bottom: 32px;
  line-height: 1.7;
  max-width: 520px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 40px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat-num {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--black);
  display: block;
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label { font-size: 12px; color: var(--gray-500); font-weight: 500; }

.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: transparent;
  color: var(--black);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover { border-color: var(--black); background: var(--gray-50); }

.hero-card {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
}

.card-topbar {
  background: var(--gray-100);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }
.card-file { font-size: 12px; color: var(--gray-500); margin-left: auto; font-family: monospace; }

.card-body { padding: 28px; font-family: 'Courier New', monospace; font-size: 13px; line-height: 1.9; }
.c-comment { color: #999; }
.c-key { color: #333; font-weight: 600; }
.c-str { color: #555; }
.c-num { color: #333; font-weight: 600; }
.c-arr { color: #666; }

.typing-cursor {
  display: inline-block;
  width: 2px; height: 14px;
  background: var(--black);
  animation: blink 1s infinite;
}

@keyframes blink { 0%,50%{ opacity:1 } 51%,100%{ opacity:0 } }

#about { background: var(--gray-50); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-bullets li {
  font-size: 15px;
  color: var(--gray-700);
  padding-left: 28px;
  position: relative;
  line-height: 1.7;
}

.about-bullets li::before {
  content: '';
  position: absolute;
  left: 0; top: 8px;
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--gray-700);
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s;
}

.about-link:hover { border-color: var(--black); transform: translateY(-2px); }
.about-link img { width: 16px; height: 16px; }

.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.edu-card {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  transition: box-shadow 0.25s, transform 0.25s;
}

.edu-card:hover { box-shadow: 0 4px 24px rgba(0,0,0,0.06); transform: translateY(-2px); }

.edu-degree { font-size: 17px; font-weight: 700; color: var(--black); margin-bottom: 6px; }
.edu-school { font-size: 14px; font-weight: 600; color: var(--gray-500); margin-bottom: 8px; }
.edu-meta { font-size: 13px; color: var(--gray-500); }
.edu-badge {
  display: inline-block;
  margin-top: 12px;
  font-size: 11px;
  font-weight: 700;
  background: var(--black);
  color: var(--white);
  padding: 4px 12px;
  border-radius: 99px;
}

#experience {
  background: var(--white);
  padding-top: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}

.timeline { position: relative; }
.timeline::before {
  content: '';
  position: absolute;
  top: 0; left: 18px;
  width: 1px; height: 100%;
  background: var(--border);
}

.exp-item {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 28px;
  margin-bottom: 48px;
}

.exp-dot {
  width: 38px; height: 38px;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  z-index: 1;
}

.exp-card {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 32px;
  transition: box-shadow 0.25s;
}

.exp-card:hover { box-shadow: 0 4px 24px rgba(0,0,0,0.06); }

.exp-header { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 6px; }
.exp-role { font-size: 18px; font-weight: 700; }
.exp-badge {
  font-size: 10px; font-weight: 700;
  letter-spacing: 1px; text-transform: uppercase;
  background: var(--black); color: var(--white);
  padding: 3px 10px; border-radius: 99px;
}

.exp-company { font-size: 14px; font-weight: 600; color: var(--gray-500); margin-bottom: 4px; }
.exp-meta { font-size: 12px; color: var(--gray-300); margin-bottom: 20px; }

.exp-bullets { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.exp-bullets li {
  font-size: 14px; color: var(--gray-700);
  padding-left: 18px; position: relative; line-height: 1.6;
}

.exp-bullets li::before {
  content: '→';
  position: absolute; left: 0;
  color: var(--accent); font-size: 12px; top: 2px;
}

.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 11px; font-weight: 500;
  color: var(--gray-700);
  background: var(--white);
  border: 1px solid var(--border);
  padding: 3px 10px; border-radius: 99px;
  transition: background 0.2s;
}

.tag:hover { background: var(--black); color: var(--white); border-color: var(--black); }

#certifications {
  overflow: hidden;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.cert-carousel-wrap {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 12px 0 32px;
}

.cert-stage {
  perspective: 1200px;
  height: 420px;
  position: relative;
}

.cert-track {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
}

.cert-card-3d {
  position: absolute;
  top: 50%; left: 50%;
  width: min(340px, 85vw);
  margin-left: calc(min(340px, 85vw) / -2);
  margin-top: -190px;
  background: var(--white);
  border: 1px solid rgba(37,99,235,0.15);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transition: transform 0.6s cubic-bezier(0.4,0,0.2,1), opacity 0.6s;
  cursor: pointer;
  user-select: none;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.cert-card-3d.side-left {
  transform: translateX(-55%) translateZ(-120px) rotateY(35deg);
  opacity: 0.45;
  z-index: 1;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.cert-card-3d.side-right {
  transform: translateX(55%) translateZ(-120px) rotateY(-35deg);
  opacity: 0.45;
  z-index: 1;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.cert-card-3d.active {
  transform: translateX(0) translateZ(0) rotateY(0);
  opacity: 1;
  z-index: 3;
  box-shadow: 0 16px 48px rgba(37,99,235,0.12);
}

.cert-card-3d.hidden {
  transform: translateX(0) translateZ(-200px) rotateY(0);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 0;
}

.cert-logo {
  height: 32px;
  margin-bottom: 16px;
  object-fit: contain;
  object-position: left;
}

.cert-title-3d {
  font-size: 17px;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 6px;
  line-height: 1.35;
}

.cert-subtitle {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 4px;
}

.cert-date { font-size: 12px; color: var(--gray-500); margin-bottom: 16px; }

.cert-skills {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}

.cert-skills li {
  font-size: 13px;
  color: var(--gray-700);
  padding-left: 14px;
  position: relative;
}

.cert-skills li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.cert-view-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--black);
  color: var(--white);
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}

.cert-view-btn:hover { opacity: 0.85; transform: translateY(-1px); }

.cert-card-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 8px;
  padding-top: 4px;
}

.cert-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--black);
  transition: all 0.2s;
  z-index: 10;
}

.cert-nav-btn:hover { background: var(--black); color: var(--white); border-color: var(--black); }
.cert-nav-btn.prev { left: -20px; }
.cert-nav-btn.next { right: -20px; }

.cert-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 72px;
  position: relative;
  z-index: 5;
}

.cert-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--gray-300);
  border: none;
  cursor: pointer;
  transition: all 0.3s;
  padding: 0;
}

.cert-dot.active {
  background: var(--accent);
  width: 24px;
  border-radius: 4px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.skill-cat {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.skill-cat-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: 16px;
}

.skill-items { display: flex; flex-wrap: wrap; gap: 8px; }

.skill-chip {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  background: var(--white);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 8px;
  transition: all 0.2s;
}

.skill-chip:hover {
  background: var(--white);
  color: var(--gray-900);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(37,99,235,0.12);
}

.skill-chip:hover img { filter: none; transform: scale(1.1); }
.skill-chip img {
  width: 16px;
  height: 16px;
  object-fit: contain;
  transition: transform 0.25s ease;
}

.skill-icon-text {
  width: 16px; height: 16px;
  border-radius: 3px;
  background: var(--black);
  color: var(--white);
  font-size: 7px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

#projects { background: var(--gray-50); padding-bottom: 32px; }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.project-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.25s, transform 0.25s;
}

.project-card:hover { box-shadow: 0 8px 32px rgba(0,0,0,0.08); transform: translateY(-3px); }

.proj-lang-bar { height: 4px; }
.proj-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }

.proj-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.proj-icon {
  width: 40px; height: 40px;
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.proj-icon svg { width: 20px; height: 20px; color: var(--gray-700); }

.proj-links { display: flex; gap: 8px; }

.proj-link {
  width: 30px; height: 30px;
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  text-decoration: none;
  transition: all 0.2s;
}

.proj-link:hover { background: var(--black); color: var(--white); border-color: var(--black); }

.proj-name { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.proj-desc { font-size: 13px; color: var(--gray-500); line-height: 1.65; margin-bottom: 16px; flex: 1; }

.proj-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--gray-500);
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.proj-lang { display: flex; align-items: center; gap: 6px; }
.lang-dot { width: 8px; height: 8px; border-radius: 50%; }

.badge-live {
  font-size: 11px; font-weight: 600;
  background: #f0fdf4; color: #16a34a;
  border: 1px solid #bbf7d0;
  padding: 4px 10px; border-radius: 6px;
}

.badge-ieee {
  font-size: 11px; font-weight: 600;
  background: #eff6ff; color: #2563eb;
  border: 1px solid #bfdbfe;
  padding: 4px 10px; border-radius: 6px;
}

.gh-loading, .gh-err {
  text-align: center;
  padding: 40px;
  color: var(--gray-500);
  grid-column: 1/-1;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 14px;
}

#github-activity { background: var(--white); }

.gh-activity-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

.gh-chart-wrap {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  overflow: hidden;
}

.gh-chart-wrap img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

.gh-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.gh-stat-card {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
}

.gh-stat-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--black);
  display: block;
}

.gh-stat-label { font-size: 12px; color: var(--gray-500); font-weight: 500; }

.gh-activity-graph {
  margin-top: 24px;
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  overflow-x: auto;
}

.gh-activity-graph img { max-width: 100%; height: auto; display: block; margin: 0 auto; }

#contact { background: var(--gray-50); padding-top: 40px; }

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info-items { display: flex; flex-direction: column; gap: 16px; margin-top: 32px; }

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--gray-700);
  font-size: 14px;
  font-weight: 500;
  transition: border-color 0.2s;
}

.contact-info-item:hover { border-color: var(--black); }

.phone-reveal-btn {
  width: 100%;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
}

.phone-reveal-btn.revealed { color: var(--black); }

.footer-phone-reveal {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-family: inherit;
}

.footer-phone-reveal.revealed {
  color: var(--white);
}

.cii-icon {
  width: 36px; height: 36px;
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cii-icon img, .cii-icon svg { width: 16px; height: 16px; }

.contact-form {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px;
  overflow: visible;
}

.form-title { font-size: 20px; font-weight: 700; margin-bottom: 24px; }

.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--gray-700); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 14px;
  background: var(--gray-50);
  outline: none;
  transition: border-color 0.2s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus { border-color: var(--black); background: var(--white); }

.form-group input[aria-invalid="true"],
.form-group textarea[aria-invalid="true"] { border-color: #dc2626; background: #fef2f2; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

.submit-btn {
  width: 100%;
  padding: 14px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
  transition: opacity 0.2s, transform 0.2s;
}

.submit-btn:hover { opacity: 0.85; transform: translateY(-1px); }
.submit-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.form-recaptcha-group { margin-bottom: 20px; overflow: visible; }

.form-recaptcha {
  min-height: 78px;
  overflow: visible;
}

.form-recaptcha-note {
  margin: 0 0 20px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray-500);
}

.form-recaptcha-note a {
  color: var(--gray-600);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.form-recaptcha-note a:hover { color: var(--black); }

.form-msg {
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 500;
  padding: 12px 14px;
  border-radius: 8px;
  display: none;
}

.form-msg.success { background: #f0fdf4; color: #16a34a; border: 1px solid #bbf7d0; display: block; }
.form-msg.error { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; display: block; }

.form-success-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 24px 40px;
  animation: formSuccessIn 0.35s ease;
}

.contact-form.is-success .form-title,
.contact-form.is-success #contactForm {
  display: none;
}

.contact-form.is-success .form-success-state {
  display: flex;
}

@keyframes formSuccessIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-success-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: #f0fdf4;
  border: 2px solid #bbf7d0;
  color: #16a34a;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.form-success-title {
  margin: 0 0 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--black);
}

.form-success-text {
  margin: 0 0 28px;
  max-width: 320px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--gray-600);
}

.form-success-reset {
  max-width: 280px;
  background: var(--white);
  color: var(--black);
  border: 1.5px solid var(--border);
}

.form-success-reset:hover {
  background: var(--gray-50);
  opacity: 1;
}

.form-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

footer {
  background: var(--black);
  color: rgba(255,255,255,0.5);
  padding: 0;
}

#education { padding-bottom: 40px; }

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-links { display: flex; gap: 20px; }
.footer-links a {
  color: rgba(255,255,255,0.5);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--white); }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-resume-btn { display: none; }
  .hamburger { display: flex; }
  .hero-grid, .about-grid, .contact-layout, .gh-activity-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .cert-nav-btn.prev { left: 0; }
  .cert-nav-btn.next { right: 0; }
  .cert-stage { height: 460px; }
  .cert-carousel-wrap { padding-bottom: 72px; }
  section { padding: 56px 16px; }
  nav { padding: 0 16px; }
  #hero { min-height: auto; padding-top: calc(var(--nav-h) + 24px); padding-bottom: 48px; }
  .hero-name-large { font-size: clamp(40px, 10vw, 64px); }
  .hero-arpit-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-overview-grid { grid-template-columns: 1fr; gap: 32px; }
  .edu-split { grid-template-columns: 1fr; }
  .edu-nav { flex-direction: row; overflow-x: auto; padding-bottom: 8px; -webkit-overflow-scrolling: touch; }
  .edu-nav-item { min-width: 220px; flex-shrink: 0; }
  .edu-detail-panel { padding: 28px 24px; min-height: auto; }
  .contact-layout { grid-template-columns: 1fr; gap: 32px; }
  .contact-form { padding: 28px 20px; }
  .projects-showcase { grid-template-columns: repeat(2, 1fr); }
  .skills-columns-grid { grid-template-columns: repeat(12, 1fr); }
  .skills-columns-grid .skill-cat,
  .skills-columns-grid .skill-cat.skill-cat-thirds,
  .skills-columns-grid .skill-cat.span-2 { grid-column: span 6; }
  .gh-chart-wrap { padding: 18px 16px; }
  .gh-heatmap-total strong { font-size: 20px; }
  .footer-rich { padding: 40px 20px; }
  .footer-thanks { font-size: clamp(22px, 6vw, 32px); }
  .nav-brand { position: static; margin-right: auto; }
  .nav-centered { justify-content: space-between; flex-wrap: wrap; gap: 8px; }
  .nav-brand-text { font-size: 17px; }
}

@media (max-width: 600px) {
  .hero-stats { gap: 20px; }
  .projects-grid { grid-template-columns: 1fr; }
  .edu-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: stretch; }
  .hero-btns .btn-primary,
  .hero-btns .btn-secondary { width: 100%; text-align: center; justify-content: center; }
  .hero-badges { justify-content: flex-start; }
  .nav-brand-text { font-size: 15px; max-width: 42vw; line-height: 1.2; }
  .skills-columns-grid { grid-template-columns: 1fr; }
  .skills-columns-grid .skill-cat,
  .skills-columns-grid .skill-cat.skill-cat-thirds,
  .skills-columns-grid .skill-cat.span-2 { grid-column: span 1; }
  .skills-columns-grid .skill-cat { padding: 24px 16px 28px; }
  .skill-items-grid { grid-template-columns: 1fr; }
  .projects-showcase { grid-template-columns: 1fr; }
  .footer-row { flex-direction: column; gap: 12px; }
  .cert-stage { height: 420px; }
  .cert-nav-btn { width: 36px; height: 36px; font-size: 16px; }
  .section-title { font-size: clamp(28px, 8vw, 40px); }
  .gh-cell { max-height: 12px; min-height: 6px; }
  .gh-heatmap-legend { justify-content: center; flex-wrap: wrap; }
  .section-header-split {
    flex-direction: column;
    align-items: center;
    min-height: auto;
    gap: 10px;
    margin-bottom: 32px;
  }
  .section-header-split .section-label {
    position: static;
    transform: none;
    align-self: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ===== IMPROVEMENTS: Nav centered ===== */
.nav-centered {
  justify-content: center;
  position: relative;
}

.nav-brand {
  position: absolute;
  left: 0;
  text-decoration: none;
  display: flex;
  align-items: center;
  border: none;
  outline: none;
  box-shadow: none;
}

.nav-brand:focus,
.nav-brand:focus-visible {
  outline: none;
  box-shadow: none;
}

.nav-brand-text {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: linear-gradient(90deg, #2563eb, #7c3aed, #06b6d4, #f5c518, #2563eb);
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: brandGradient 6s linear infinite;
  border: none;
  outline: none;
  box-shadow: none;
}

@keyframes brandGradient {
  0% { background-position: 0% 50%; }
  100% { background-position: 300% 50%; }
}

.nav-centered .nav-links {
  gap: 8px;
}

.nav-centered .nav-links a {
  position: relative;
  font-weight: 700;
  font-size: 15px;
  color: var(--black);
  padding: 6px 4px;
  margin: 0 10px;
  background: transparent;
  border-radius: 0;
  transition: color 0.2s;
}

.nav-centered .nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--black);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s ease;
}

.nav-centered .nav-links a:hover,
.nav-centered .nav-links a.active {
  background: transparent;
  color: var(--black);
}

.nav-centered .nav-links a:hover::after,
.nav-centered .nav-links a.active::after {
  transform: scaleX(1);
}

.nav-resume-btn {
  position: absolute;
  right: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: var(--black);
  color: var(--white);
  border-radius: 99px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}

.nav-resume-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

.hero-simple {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}

.hero-greeting {
  font-size: 25px;
  color: var(--gray-500);
  margin-bottom: 8px;
}

.hero-dot { color: #e74c3c; }

.hero-name-large {
  font-family: var(--font-display);
  font-size: clamp(52px, 7vw, 88px);
  font-weight: 700;
  color: var(--black);
  line-height: 1;
  margin-bottom: 0;
}

/* ===== Full-width wavy underline (Arpit-style) ===== */
.title-wave-wrap {
  display: inline-block;
  max-width: 100%;
}

.title-wave-text {
  display: block;
}

.title-wave {
  display: block;
  width: 100%;
  height: clamp(9px, 1.1vw, 14px);
  margin-top: 10px;
}

.hero-name-block {
  display: inline-block;
  margin-bottom: 20px;
}

.hero-name-block .title-wave {
  margin-top: 12px;
}

.section-title .title-wave-wrap {
  margin-bottom: 4px;
}

.section-title .title-wave {
  margin-top: 8px;
  height: clamp(7px, 0.9vw, 11px);
}

.section-title-center .title-wave-wrap {
  margin-left: auto;
  margin-right: auto;
}

.hero-wave {
  width: 100%;
  height: 14px;
  margin-bottom: 20px;
  display: block;
}

.hero-title-role {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: 16px;
  color: var(--gray-500);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 36px;
}

/* ===== About overview with profile ===== */
.about-overview-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.profile-photo-wrap {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, #7c3aed, #2563eb, #06b6d4);
  box-shadow: 0 0 40px rgba(124,58,237,0.25);
  margin: 0 auto 24px;
}

.profile-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--white);
}

.about-profile-col {
  text-align: center;
}

.about-profile-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 220px;
  margin: 0 auto;
}

.about-btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  width: 100%;
}

.about-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0,0,0,0.12);
}

.about-btn-resume {
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  color: var(--white);
  grid-column: 1 / -1;
}

.about-btn-linkedin { background: #0077b5; color: var(--white); }
.about-btn-github { background: var(--black); color: var(--white); }

.about-btn img { filter: brightness(0) invert(1); }

.about-bullets-emoji li {
  padding-left: 36px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.about-bullets-emoji li::before { display: none; }

.ab-emoji {
  font-size: 18px;
  flex-shrink: 0;
  line-height: 1.6;
}

.ab-text {
  flex: 1;
  min-width: 0;
}

/* ===== Education timeline ===== */
.edu-timeline {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding-left: 100px;
}

.edu-timeline::before {
  content: '';
  position: absolute;
  left: 88px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}

.edu-timeline-item {
  position: relative;
  margin-bottom: 48px;
  display: grid;
  grid-template-columns: 1fr;
}

.edu-year {
  position: absolute;
  left: -100px;
  top: 4px;
  width: 72px;
  text-align: right;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}

.edu-timeline-dot {
  position: absolute;
  left: -17px;
  top: 10px;
  width: 14px;
  height: 14px;
  background: var(--white);
  border: 3px solid var(--accent);
  border-radius: 50%;
  z-index: 1;
}

.edu-timeline-content {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 28px;
  margin-left: 20px;
  transition: box-shadow 0.25s, transform 0.25s;
}

.edu-timeline-content:hover {
  box-shadow: 0 8px 28px rgba(0,0,0,0.06);
  transform: translateX(4px);
}

.edu-timeline-degree {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.edu-timeline-school {
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.edu-timeline-detail {
  font-size: 13px;
  color: var(--gray-500);
}

/* ===== Cert horizontal 3D scroll ===== */
.section-title-center { text-align: center; }

.section-label-center { text-align: center; }

.section-header-split {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  margin-bottom: 40px;
}

.section-header-split .section-label {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  margin-bottom: 0;
}

.section-header-split .section-title {
  margin-bottom: 0;
  text-align: center;
}

.section-header-split .section-title-center .title-wave-wrap {
  margin-left: auto;
  margin-right: auto;
}

.section-wave-center {
  display: block;
  width: 100%;
  max-width: 200px;
  height: 12px;
  margin: 0 auto 48px;
}

.cert-scroll-outer {
  perspective: 1400px;
  overflow: hidden;
  padding: 40px 0 60px;
}

.cert-scroll-track {
  display: flex;
  gap: 48px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 20px 10vw;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.cert-scroll-track::-webkit-scrollbar { display: none; }

.cert-scroll-card {
  flex: 0 0 min(320px, 80vw);
  scroll-snap-align: center;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transition: transform 0.4s cubic-bezier(0.4,0,0.2,1), box-shadow 0.4s;
  transform-style: preserve-3d;
}

.cert-scroll-card:hover {
  box-shadow: 0 16px 48px rgba(0,0,0,0.12);
}

.cert-scroll-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--border);
  background: var(--gray-100);
}

.cert-scroll-body {
  padding: 20px 22px 24px;
}

.cert-scroll-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.35;
}

.cert-scroll-meta {
  font-size: 12px;
  color: var(--gray-500);
}

/* ===== Skills multi-column ===== */
.skills-columns-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
  align-items: stretch;
}

.skills-columns-grid .skill-cat {
  grid-column: span 3;
  display: flex;
  flex-direction: column;
  height: 100%;
  text-align: center;
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 20px 32px;
  box-sizing: border-box;
}

.skills-columns-grid .skill-cat.skill-cat-thirds {
  grid-column: span 4;
}

.skill-cat-title {
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
  color: var(--black);
  margin-bottom: 20px;
  flex-shrink: 0;
}

.skill-items-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  flex: 1;
  align-content: start;
}

.skill-chip {
  justify-content: flex-start;
  padding: 9px 12px;
  transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
}

.skill-chip:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 6px 16px rgba(37,99,235,0.12);
  background: var(--white);
  color: var(--gray-900);
  border-color: var(--accent);
}

.skills-columns-grid .skill-cat.span-2 {
  grid-column: span 2;
}

/* ===== Projects showcase cards ===== */
.projects-showcase {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.proj-showcase-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.3s, transform 0.3s;
}

.proj-showcase-card:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
  transform: translateY(-4px);
}

.proj-thumb {
  height: 200px;
  background: #1a1a2e;
  position: relative;
  overflow: hidden;
}

.proj-thumb-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.proj-thumb-image .proj-thumb-bar {
  z-index: 2;
}

.proj-thumb-code {
  padding: 40px 16px 16px;
  font-family: 'Courier New', monospace;
  font-size: 11px;
  color: #a0aec0;
  line-height: 1.6;
}

.proj-thumb-bar {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 28px;
  background: #0f0f1a;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
}

.proj-thumb-bar span {
  width: 8px; height: 8px;
  border-radius: 50%;
}

.proj-showcase-body {
  padding: 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.proj-showcase-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}

.proj-showcase-desc {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.65;
  margin-bottom: 16px;
}

.proj-showcase-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.proj-showcase-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  background: var(--gray-100);
  border: 1px solid var(--border);
  border-radius: 99px;
  color: var(--gray-700);
}

.proj-showcase-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.proj-view-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: #1e293b;
  color: var(--white);
  border-radius: 99px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}

.proj-view-btn:hover { opacity: 0.9; transform: translateX(2px); }

.proj-showcase-date {
  font-size: 12px;
  color: var(--gray-500);
}

/* ===== GitHub year tabs ===== */
.gh-year-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.gh-year-btn {
  padding: 8px 18px;
  border: 1.5px solid var(--border);
  border-radius: 99px;
  background: var(--white);
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}

.gh-year-btn:hover { border-color: var(--black); }

.gh-year-btn.active {
  background: var(--black);
  color: var(--white);
  border-color: var(--black);
}

.gh-profile-link-wrap {
  margin-top: 28px;
  text-align: center;
}

.gh-profile-btn { display: inline-flex; }

/* ===== Rich footer ===== */
.footer-rich {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 32px 24px 24px;
}

.footer-thanks {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.5vw, 38px);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 20px;
}

.footer-section { margin-bottom: 16px; }

.footer-label {
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  margin-bottom: 8px;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--white);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: opacity 0.2s;
}

.footer-item:hover { opacity: 0.75; }

.footer-social-link:hover { opacity: 1; }

.footer-social-link[href*="linkedin"]:hover { color: #0A66C2; }

.footer-social-link[href*="github"]:hover { color: #fff; }

.footer-social-link[href*="t.me"]:hover { color: #26A5E4; }

/* ===== GitHub activity inside projects ===== */
.projects-gh-block {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.projects-gh-block > .section-label {
  margin-bottom: 20px;
}

.gh-total-stat {
  display: none;
}

.gh-chart-wrap {
  position: relative;
  min-height: 140px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  overflow: hidden;
}

.gh-chart-wrap img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

.gh-chart-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--gray-500);
  background: var(--gray-50);
  border-radius: 14px;
}

.gh-chart-wrap.loaded .gh-chart-loading { display: none; }

.gh-heatmap-since {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gray-500);
}

.gh-heatmap-total {
  font-size: 14px;
  color: var(--gray-700);
}

.gh-heatmap-total strong {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--black);
  margin-right: 4px;
}

.gh-year-tabs { display: none; }

.skill-chip .skill-emoji {
  font-size: 15px;
  line-height: 1;
  width: 16px;
  text-align: center;
}

.footer-designed {
  margin-top: 24px;
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.65);
}

/* ===== Scroll to top ===== */
.scroll-top-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--black);
  color: var(--white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
  z-index: 999;
}

.scroll-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
}

/* ===== Hero Arpit two-column ===== */
.hero-arpit-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-arpit-left { max-width: 540px; }

.hero-tagline-bold {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: 16px;
  line-height: 1.5;
}

.hero-bio {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-arpit-right {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 600;
  color: var(--gray-800);
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.hero-badge img {
  width: 16px;
  height: 16px;
  object-fit: contain;
}

.hero-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}

.hero-badge-green { border-color: rgba(22,163,74,0.35); background: rgba(22,163,74,0.06); }
.hero-badge-purple { border-color: rgba(37,99,235,0.35); background: rgba(37,99,235,0.06); }
.hero-badge-cyan { border-color: rgba(8,145,178,0.35); background: rgba(8,145,178,0.06); }

.hero-badge-caption {
  text-align: center;
  font-size: 12px;
  color: var(--gray-500);
  font-weight: 500;
}

/* ===== About buttons professional ===== */
.about-profile-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 220px;
  margin: 0 auto;
}

.about-btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  width: 100%;
}

.about-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0,0,0,0.12);
}

.about-btn-resume {
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  color: var(--white);
}

.about-btn-linkedin { background: #0077b5; color: var(--white); }
.about-btn-github { background: var(--black); color: var(--white); }

.about-btn img { filter: brightness(0) invert(1); }

/* ===== Education split layout ===== */
.section-subtitle-center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.edu-split {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 24px;
  margin-top: 16px;
}

.edu-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.edu-nav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  width: 100%;
  font-family: var(--font-body);
}

.edu-nav-item:hover { background: var(--gray-50); }

.edu-nav-item.active {
  background: var(--gray-50);
  border-color: var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.edu-nav-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--white);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 800;
  color: var(--accent);
  flex-shrink: 0;
}

.edu-nav-text {
  flex: 1;
  min-width: 0;
}

.edu-nav-degree {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--black);
  margin-bottom: 2px;
}

.edu-nav-school {
  display: block;
  font-size: 12px;
  color: var(--gray-500);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.edu-detail-panel {
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 40px;
  min-height: 320px;
}

.edu-detail-degree {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 6px;
}

.edu-detail-school {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-500);
  margin-bottom: 4px;
}

.edu-detail-period {
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 24px;
}

.edu-detail-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.edu-detail-bullets li {
  font-size: 14px;
  color: var(--gray-700);
  padding-left: 18px;
  position: relative;
  line-height: 1.65;
}

.edu-detail-bullets li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ===== Cert 3D carousel with image ===== */
.cert-card-3d .cert-card-img-wrap {
  padding: 14px 14px 0;
  background: var(--gray-50);
  border-bottom: 1px solid var(--border);
}

.cert-card-3d .cert-card-img {
  width: 100%;
  height: 180px;
  object-fit: contain;
  object-position: center;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--white);
  display: block;
}

.cert-card-3d .cert-card-body {
  padding: 20px 24px 32px;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.cert-card-3d .cert-skills {
  flex: 1;
  margin-bottom: 12px;
}

.cert-card-3d .cert-card-footer {
  margin-top: 12px;
  padding-bottom: 6px;
}

.cert-stage { height: 560px; }

.cert-card-3d {
  width: min(360px, 88vw);
  margin-left: calc(min(360px, 88vw) / -2);
  margin-top: -240px;
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--white);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .nav-brand-text,
  .title-wave .wave-path,
  .wave-animated .wave-path {
    animation: none;
  }
}