/* ===== CSS VARIABLES ===== */
:root {
  --bg: #0A0A0F;
  --bg2: #0F0F1A;
  --bg3: #141428;
  --cyan: #00D4FF;
  --purple: #7B2FFF;
  --grad: linear-gradient(135deg, #00D4FF, #7B2FFF);
  --grad-rev: linear-gradient(135deg, #7B2FFF, #00D4FF);
  --text: #E8E8F0;
  --text2: #9999BB;
  --border: rgba(0, 212, 255, 0.15);
  --glass: rgba(255, 255, 255, 0.04);
  --glass-hover: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
  --glow-purple: 0 0 20px rgba(123, 47, 255, 0.3);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

/* ===== LIGHT MODE (OVERRIDE LAYER) ===== */
[data-theme="light"] {
  --bg: #E8EEF5;
  --bg2: #F2F6FA;
  --bg3: #E0E8F0;
  --panel: rgba(242, 246, 250, 0.95);
  --border: rgba(0, 180, 200, 0.18);
  --border-bright: rgba(0, 180, 200, 0.45);
  --text: #2E4060;
  --text-dim: rgba(46, 64, 96, 0.55);
  --text-bright: #1E3048;
  --text2: rgba(46, 64, 96, 0.65);
  --glass: rgba(255, 255, 255, 0.6);
  --glass-hover: rgba(255, 255, 255, 0.8);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --glow-cyan: none;
  --glow-purple: none;
  --cyan: #00C8D4;
  --green: #28CC00;
  --purple: #7B35DD;
  --red: #E0203F;
  --amber: #D99800;
}

/* Tắt VFX ở Light Mode */
[data-theme="light"] body::before,
[data-theme="light"] body::after {
  display: none;
}

[data-theme="light"] #navbar.scrolled {
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .mobile-menu {
  background: rgba(255, 255, 255, 0.97);
}

[data-theme="light"] .hero-avatar {
  box-shadow: 0 0 0 4px rgba(0, 200, 212, 0.2), 0 0 20px rgba(0, 0, 0, 0.1);
  animation: none;
}

.theme-btn {
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color 0.2s ease, color 0.2s ease;
}

@media (hover: hover) {
  .theme-btn:hover {
    border-color: var(--border-bright);
    color: var(--cyan);
  }
}

.theme-btn svg {
  display: block;
}

/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  font-family: 'Be Vietnam Pro', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
  overflow-x: hidden;
}

input,
textarea,
select {
  font-size: 16px !important;
  font-family: inherit;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* ===== GRID BACKGROUND ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

/* ===== UTILITIES ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-pad {
  padding: 100px 0;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition);
}

.glass-card:hover {
  background: var(--glass-hover);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-cyan);
  transform: translateY(-4px);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--text2);
  font-size: 1.05rem;
  margin-bottom: 60px;
}

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.badge-cyan {
  background: rgba(0, 212, 255, 0.12);
  color: var(--cyan);
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.badge-purple {
  background: rgba(123, 47, 255, 0.12);
  color: #A855F7;
  border: 1px solid rgba(123, 47, 255, 0.3);
}

.badge-green {
  background: rgba(16, 185, 129, 0.12);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-orange {
  background: rgba(249, 115, 22, 0.12);
  color: #F97316;
  border: 1px solid rgba(249, 115, 22, 0.3);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--cyan);
  border: 2px solid var(--cyan);
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.1);
  transform: translateY(-2px);
}

/* Fade-in animation */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up:nth-child(2) {
  transition-delay: 0.1s;
}

.fade-up:nth-child(3) {
  transition-delay: 0.2s;
}

.fade-up:nth-child(4) {
  transition-delay: 0.3s;
}

.fade-up:nth-child(5) {
  transition-delay: 0.4s;
}

.fade-up:nth-child(6) {
  transition-delay: 0.5s;
}

/* ===== NAVBAR ===== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

#navbar.scrolled {
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-monogram {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.85rem;
  color: #fff;
  letter-spacing: 0.5px;
}

.logo-name {
  font-weight: 700;
  font-size: 1rem;
  text-transform: uppercase;
}

.logo-name span {
  color: var(--cyan);
}

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

.nav-links a {
  color: var(--text2);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 999px;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan);
  background: rgba(0, 212, 255, 0.08);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: translateX(-8px);
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: rgba(10, 10, 15, 0.97);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  backdrop-filter: blur(20px);
}

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

.mobile-menu a {
  color: var(--text2);
  padding: 12px 0;
  font-size: 1rem;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.mobile-menu a:hover {
  color: var(--cyan);
}

/* ===== HERO ===== */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
}

.hero-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 32px;
  overflow: hidden;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.3), 0 0 0 8px rgba(0, 212, 255, 0.1), 0 0 40px rgba(0, 212, 255, 0.4);
  animation: pulse-glow 3s infinite;
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  display: block;
}

@keyframes pulse-glow {

  0%,
  100% {
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2), 0 0 40px rgba(0, 212, 255, 0.3);
  }

  50% {
    box-shadow: 0 0 0 8px rgba(0, 212, 255, 0.1), 0 0 60px rgba(0, 212, 255, 0.5);
  }
}

.hero-typing {
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--cyan);
  font-weight: 600;
  letter-spacing: 1px;
  min-height: 1.5em;
  margin-bottom: 16px;
}

.cursor {
  display: inline-block;
  animation: blink 0.8s infinite;
}

@keyframes blink {

  0%,
  49% {
    opacity: 1;
  }

  50%,
  100% {
    opacity: 0;
  }
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-tagline {
  color: var(--text2);
  font-size: clamp(1rem, 2vw, 1.15rem);
  margin-bottom: 32px;
  max-width: 600px;
}

.hero-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text2);
  font-size: 0.8rem;
  animation: bounce 2s infinite;
}

.scroll-hint i {
  font-size: 1.2rem;
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(8px);
  }
}

/* Floating dots */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.dot-float {
  position: absolute;
  border-radius: 50%;
  animation: float-dot linear infinite;
  opacity: 0.4;
}

@keyframes float-dot {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }

  10% {
    opacity: 0.4;
  }

  90% {
    opacity: 0.4;
  }

  100% {
    transform: translateY(-20px) scale(1);
    opacity: 0;
  }
}

/* ===== ABOUT ===== */
#about {
  background: var(--bg2);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-info-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.info-card {
  padding: 16px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 12px;
}

.info-card i {
  color: var(--cyan);
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
}

.info-card-text small {
  display: block;
  color: var(--text2);
  font-size: 0.75rem;
}

.info-card-text strong {
  font-size: 0.9rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.stat-card {
  text-align: center;
  padding: 24px 16px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text2);
  margin-top: 4px;
}

.about-bio h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 24px;
}

.about-bio p {
  color: var(--text2);
  margin-bottom: 20px;
  line-height: 1.8;
}

/* ===== SKILLS ===== */
#skills {
  background: var(--bg);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.skill-group {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.skill-group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 28px;
}

.skill-group-title i {
  font-size: 1.3rem;
}

.skill-item {
  margin-bottom: 20px;
}

.skill-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.skill-pct {
  color: var(--cyan);
  font-weight: 700;
}

.skill-bar-bg {
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  overflow: hidden;
}

.skill-bar {
  height: 100%;
  border-radius: 3px;
  background: var(--grad);
  width: 0%;
  transition: width 1.2s ease;
}

/* ===== PROJECTS ===== */
#projects {
  background: var(--bg2);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--glow-cyan), var(--shadow);
}

.project-top {
  height: 5px;
}

.project-top.c0 {
  background: linear-gradient(90deg, #00D4FF, #7B2FFF);
}

.project-top.c1 {
  background: linear-gradient(90deg, #10B981, #00D4FF);
}

.project-top.c2 {
  background: linear-gradient(90deg, #F59E0B, #EF4444);
}

.project-top.c3 {
  background: linear-gradient(90deg, #7B2FFF, #EC4899);
}

.project-top.c4 {
  background: linear-gradient(90deg, #10B981, #7B2FFF);
}

.project-top.c5 {
  background: linear-gradient(90deg, #F97316, #7B2FFF);
}

.project-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.project-desc {
  color: var(--text2);
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1;
}

.project-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.stack-tag {
  padding: 3px 10px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--cyan);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

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

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.link-github {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text2);
}

.link-github:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
}

.link-demo {
  background: rgba(0, 212, 255, 0.12);
  color: var(--cyan);
}

.link-demo:hover {
  background: rgba(0, 212, 255, 0.2);
}

/* ===== EXPERIENCE ===== */
#experience {
  background: var(--bg);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--purple));
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-dot {
  position: absolute;
  left: -35px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: var(--glow-cyan);
}

.exp-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.exp-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-cyan);
}

.exp-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.exp-role {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.exp-company {
  color: var(--cyan);
  font-weight: 600;
  font-size: 0.95rem;
}

.exp-period {
  font-size: 0.82rem;
  color: var(--text2);
  background: var(--glass);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.exp-list {
  padding-left: 16px;
  list-style: none;
}

.exp-list li {
  color: var(--text2);
  font-size: 0.9rem;
  margin-bottom: 8px;
  position: relative;
  padding-left: 16px;
}

.exp-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--cyan);
}

/* ===== EDUCATION ===== */
#education {
  background: var(--bg2);
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.edu-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}

.edu-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.edu-subtitle {
  color: var(--cyan);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.edu-meta {
  color: var(--text2);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.cert-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.cert-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  display: flex;
  align-items: stretch;
  gap: 12px;
  transition: var(--transition);
}

.cert-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-cyan);
}

.cert-icon {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
}

.cert-info {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
}

.cert-name {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.cert-year {
  font-size: 0.75rem;
  color: var(--text2);
}

/* ===== CONTACT ===== */
#contact {
  background: var(--bg);
}

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

.contact-form {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.contact-form h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 28px;
}

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text2);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-info h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-info>p {
  color: var(--text2);
  margin-bottom: 32px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  transition: var(--transition);
}

.contact-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
}

.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--grad);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}

.contact-item-text small {
  color: var(--text2);
  font-size: 0.75rem;
  display: block;
}

.contact-item-text strong {
  font-size: 0.95rem;
}

.social-links {
  display: flex;
  gap: 12px;
  margin-top: 32px;
}

.social-link {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--text2);
  transition: var(--transition);
}

.social-link:hover {
  background: var(--grad);
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--glow-cyan);
}

/* ===== FOOTER ===== */
footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 40px 24px;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.footer-sub {
  color: var(--text2);
  font-size: 0.85rem;
  margin-bottom: 4px;
}

.footer-stack {
  color: var(--cyan);
  font-size: 0.8rem;
  margin-bottom: 24px;
}

.back-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 50px;
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--text2);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.back-top:hover {
  background: rgba(0, 212, 255, 0.1);
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

/* ===== AVATAR POPUP ===== */
.hero-avatar {
  cursor: pointer;
}

.hero-avatar:hover {
  transform: scale(1.06);
}

.hero-avatar:hover img {
  filter: brightness(1.08);
}

.av-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.av-overlay.open {
  opacity: 1;
  visibility: visible;
}

.av-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.av-box {
  position: relative;
  z-index: 1;
  background: #1a1a2e;
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 20px;
  width: min(420px, 92vw);
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.05);
  transform: scale(0.85) translateY(20px);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.av-overlay.open .av-box {
  transform: scale(1) translateY(0);
}

.av-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.2s;
}

.av-close:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: rotate(90deg);
}

.av-photo-wrap {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: linear-gradient(135deg, #0a0a1f, #1a1a3e);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.av-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.av-caption {
  padding: 20px 20px 4px;
}

.av-caption-name {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 4px;
}

.av-caption-sub {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.av-actions {
  display: flex;
  gap: 10px;
  padding: 16px 20px 20px;
}

.av-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.75);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.av-btn:hover {
  background: rgba(255, 255, 255, 0.13);
  color: #fff;
}

.av-btn-primary {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
}

.av-btn-primary:hover {
  opacity: 0.9;
  box-shadow: var(--glow-cyan);
}

/* ===== RESPONSIVE ===== */

@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

@media (max-width: 768px) {
  .section-pad {
    padding: 70px 0;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

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

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

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

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

  .hero-avatar {
    width: 80px;
    height: 80px;
    font-size: 1.5rem;
  }

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

  .timeline {
    padding-left: 28px;
  }

  .timeline::before {
    left: 8px;
  }

  .timeline-dot {
    left: -25px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-btns {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-btns .btn {
    justify-content: center;
  }

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