/* ─── Reset & Base ─── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --bg: #08080f;
  --bg-alt: #0d0d1a;
  --surface: #111125;
  --surface-hover: #1a1a35;
  --card: rgba(17, 17, 37, 0.8);
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --glass: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  --whatsapp: #25d366;
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--primary); color: #fff; }
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--secondary); }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

/* ─── Preloader ─── */
#preloader {
  position: fixed; inset: 0; z-index: 99999;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}
#preloader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-ring {
  width: 60px; height: 60px; border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: var(--primary);
  border-bottom-color: var(--accent);
  animation: spin 1s linear infinite;
  position: relative;
}
.loader-ring::before {
  content: ''; position: absolute; inset: 6px;
  border-radius: 50%;
  border: 3px solid transparent;
  border-left-color: var(--secondary);
  border-right-color: var(--accent);
  animation: spin 0.6s linear infinite reverse;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Particles ─── */
#particles-canvas {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
}

/* ─── Noise Overlay ─── */
.noise-overlay {
  position: fixed; inset: 0; z-index: 1;
  pointer-events: none;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ─── Navigation ─── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 20px 40px;
  display: flex; align-items: center; justify-content: space-between;
  transition: var(--transition);
}
nav.scrolled {
  background: rgba(8, 8, 15, 0.85);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--glass-border);
  padding: 14px 40px;
}
.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 50px;
  transition: var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: var(--glass);
}
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--secondary)) !important;
  color: #fff !important;
  font-weight: 600 !important;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35) !important; }
.menu-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

/* ─── Hero ─── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  position: relative; z-index: 2;
  padding: 120px 40px 80px;
  text-align: center;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content { max-width: 900px; position: relative; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}
.hero-badge .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: #22c55e; display: inline-block;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
.hero h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.8rem, 7vw, 5.2rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 40%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-subtitle strong { color: #fff; }
.hero-actions {
  display: flex; gap: 16px; justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 34px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(99, 102, 241, 0.45);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid var(--glass-border);
}
.btn-outline:hover {
  background: var(--glass);
  border-color: var(--text-muted);
  transform: translateY(-3px);
}
.hero-stats {
  display: flex; gap: 48px; justify-content: center;
  margin-top: 60px; padding-top: 40px;
  border-top: 1px solid var(--glass-border);
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}
.scroll-indicator {
  position: absolute; bottom: 40px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  animation: bounce-down 2s ease-in-out infinite;
}
@keyframes bounce-down { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }

/* ─── Sections ─── */
section {
  position: relative; z-index: 2;
  padding: 100px 40px;
}
#skills, #projects, .achievements-section { background: var(--bg-alt); }
.section-header {
  text-align: center; margin-bottom: 64px;
}
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
}
.section-desc {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* ─── About ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: center;
}
.about-visual {
  position: relative;
  display: flex; justify-content: center;
}
.about-image-frame {
  width: 340px; height: 340px;
  border-radius: 30px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  padding: 3px;
}
.about-image-frame .glow-ring {
  position: absolute; inset: -20px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent, var(--primary), var(--secondary), var(--accent), transparent);
  opacity: 0.15;
  animation: rotate-glow 8s linear infinite;
  z-index: -1;
}
@keyframes rotate-glow { to { transform: rotate(360deg); } }
.about-img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 28px;
  transition: var(--transition);
}
.about-img:hover { transform: scale(1.03); }
.about-text h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem; margin-bottom: 16px;
}
.about-text .highlight { color: var(--primary); }
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.about-text strong { color: #fff; }
.about-tags {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px;
}
.about-tags span {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ─── Skills ─── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
}
.skill-category {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.skill-category:hover {
  background: var(--surface-hover);
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.2);
}
.skill-category h4 {
  font-size: 1rem; margin-bottom: 24px;
  display: flex; align-items: center; gap: 10px;
  color: var(--accent);
}
.skill-item { margin-bottom: 18px; }
.skill-item:last-child { margin-bottom: 0; }
.skill-item .info {
  display: flex; justify-content: space-between;
  font-size: 0.85rem; margin-bottom: 6px;
}
.skill-item .info span:last-child { color: var(--text-muted); }
.skill-bar {
  width: 100%; height: 6px;
  border-radius: 3px;
  background: rgba(255,255,255,0.06);
  overflow: hidden;
}
.skill-bar .fill {
  height: 100%; border-radius: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ─── Services ─── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.service-card {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: var(--transition);
}
.service-card:hover::before { opacity: 1; }
.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.service-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.4rem;
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(139,92,246,0.15));
  color: var(--primary);
}
.service-card h4 { font-size: 1.05rem; margin-bottom: 12px; }
.service-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ─── Slider / Carousel ─── */
.slider-section { overflow: hidden; }
.slider-container {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}
.slider-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}
.slide {
  min-width: 100%;
  padding: 0 12px;
}
.slide-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--glass-border);
  min-height: 380px;
}
.slide-image {
  height: 100%; min-height: 380px;
  overflow: hidden;
  position: relative;
}
.slide-image img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.slide-inner:hover .slide-image img { transform: scale(1.05); }
.slide-image .slide-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent 50%, var(--bg-alt) 100%);
}
.slide-content {
  padding: 48px 40px;
  display: flex; flex-direction: column; justify-content: center;
}
.slide-content .slide-tag {
  display: inline-block;
  background: rgba(99,102,241,0.15);
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
  align-self: flex-start;
  letter-spacing: 0.5px;
}
.slide-content h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  margin-bottom: 14px;
}
.slide-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 24px;
}
.slide-content .slide-link {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex; align-items: center; gap: 8px;
  transition: var(--transition);
}
.slide-content .slide-link:hover { gap: 14px; color: var(--secondary); }
.slider-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
  display: flex; align-items: center; justify-content: center;
}
.slider-btn:hover { background: var(--primary); border-color: var(--primary); }
.slider-btn-prev { left: -12px; }
.slider-btn-next { right: -12px; }
.slider-dots {
  display: flex; justify-content: center; gap: 10px;
  margin-top: 28px;
}
.slider-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}
.slider-dot.active { background: var(--primary); width: 28px; border-radius: 5px; }
.slider-dot:hover { background: var(--primary); }

/* ─── Projects ─── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
  max-width: 1100px;
  margin: 0 auto;
}
.project-card {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.project-thumb {
  height: 200px;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
  position: relative;
  overflow: hidden;
}
.project-thumb .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(8,8,15,0.9));
}
.project-body { padding: 28px; }
.project-body .tag {
  display: inline-block;
  background: rgba(99,102,241,0.15);
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}
.project-body h4 { font-size: 1.1rem; margin-bottom: 10px; }
.project-body p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }
.project-links { margin-top: 16px; display: flex; gap: 12px; }
.project-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition);
  display: inline-flex; align-items: center; gap: 6px;
}
.project-links a:hover { color: var(--primary); }

/* ─── Certifications ─── */
.cert-timeline {
  max-width: 800px; margin: 0 auto; position: relative;
}
.cert-timeline::before {
  content: ''; position: absolute; left: 40px; top: 0; bottom: 0;
  width: 1px; background: linear-gradient(180deg, var(--primary), var(--secondary), transparent);
}
.cert-item {
  display: flex; gap: 32px; margin-bottom: 40px;
  padding-left: 0;
  opacity: 0; transform: translateX(-20px);
  transition: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.cert-item.visible { opacity: 1; transform: translateX(0); }
.cert-dot {
  width: 16px; height: 16px; min-width: 16px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 3px var(--primary);
  margin-top: 4px;
  position: relative;
  z-index: 1;
}
.cert-card {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 24px 28px;
  flex: 1;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.cert-card:hover {
  background: var(--surface-hover);
  border-color: rgba(99,102,241,0.2);
}
.cert-card h4 { font-size: 1rem; margin-bottom: 4px; }
.cert-card .issuer { font-size: 0.85rem; color: var(--primary); margin-bottom: 8px; display: block; }
.cert-card .date { font-size: 0.8rem; color: var(--text-muted); }

/* ─── Achievements ─── */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.achievement-card {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.achievement-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.2);
}
.achievement-card .icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 12px;
}
.achievement-card .num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.4rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.achievement-card .label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* ─── Contact ─── */
.contact-section {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}
.contact-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.contact-card {
  background: var(--card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 56px 40px;
  backdrop-filter: blur(10px);
  margin-bottom: 32px;
}
.contact-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.6rem;
  margin-bottom: 12px;
}
.contact-card p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.contact-email {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  padding: 16px 40px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  transition: var(--transition);
}
.contact-email:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 16px 48px rgba(99, 102, 241, 0.4);
}
.contact-divider {
  margin: 24px 0 16px;
  position: relative;
  text-align: center;
}
.contact-divider span {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--card);
  padding: 0 16px;
  position: relative;
  z-index: 1;
}
.contact-divider::before {
  content: '';
  position: absolute; top: 50%; left: 0; right: 0;
  height: 1px;
  background: var(--glass-border);
}
.contact-whatsapp {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  padding: 14px 36px;
  border-radius: 50px;
  background: var(--whatsapp);
  transition: var(--transition);
}
.contact-whatsapp:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 36px rgba(37, 211, 102, 0.35);
}
.contact-socials {
  display: flex; justify-content: center; gap: 16px; margin-top: 28px;
}
.contact-socials a {
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  transition: var(--transition);
}
.contact-socials a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-3px);
}

/* ─── Footer ─── */
footer {
  position: relative; z-index: 2;
  padding: 32px 40px;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  font-size: 0.85rem;
  color: var(--text-muted);
}
footer .heart { color: var(--primary); }

/* ─── Reveal Animations ─── */
.reveal {
  opacity: 0; transform: translateY(40px);
  transition: 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ─── Back to Top ─── */
#back-to-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 999;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0; visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}
#back-to-top.show {
  opacity: 1; visibility: visible;
  transform: translateY(0);
}
#back-to-top:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(99, 102, 241, 0.45); }

/* ─── WhatsApp Float Button ─── */
.whatsapp-float {
  position: fixed; bottom: 96px; right: 32px; z-index: 998;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--whatsapp);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.35);
  transition: var(--transition);
  animation: whatsapp-pulse 2s ease-in-out infinite;
}
.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 32px rgba(37, 211, 102, 0.5);
  animation-play-state: paused;
}
.whatsapp-tooltip {
  position: absolute; right: 66px;
  background: var(--surface);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  border: 1px solid var(--glass-border);
}
.whatsapp-float:hover .whatsapp-tooltip { opacity: 1; }
@keyframes whatsapp-pulse {
  0%, 100% { box-shadow: 0 4px 20px rgba(37, 211, 102, 0.35); }
  50% { box-shadow: 0 4px 36px rgba(37, 211, 102, 0.6); }
}

/* ─── Decorative Orbs ─── */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
}
.orb-1 { width: 500px; height: 500px; background: var(--primary); top: -10%; left: -10%; animation: float-orb 20s ease-in-out infinite; }
.orb-2 { width: 400px; height: 400px; background: var(--secondary); bottom: -10%; right: -10%; animation: float-orb 25s ease-in-out infinite reverse; }
.orb-3 { width: 300px; height: 300px; background: var(--accent); top: 50%; left: 50%; transform: translate(-50%, -50%); animation: float-orb 18s ease-in-out infinite 5s; }
@keyframes float-orb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -40px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; text-align: center; }
  .about-tags { justify-content: center; }
  .slide-inner { grid-template-columns: 1fr; }
  .slide-image { min-height: 240px; }
  .slide-image .slide-overlay { background: linear-gradient(0deg, var(--bg-alt) 20%, transparent 100%); }
  .slide-content { padding: 32px; }
}
@media (max-width: 768px) {
  nav { padding: 16px 24px; }
  nav.scrolled { padding: 12px 24px; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(8,8,15,0.95);
    backdrop-filter: blur(20px);
    padding: 20px 24px;
    border-bottom: 1px solid var(--glass-border);
  }
  .menu-toggle { display: block; }
  section { padding: 60px 24px; }
  .hero { padding: 100px 24px 60px; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .cert-timeline::before { left: 24px; }
  .cert-item { gap: 20px; }
  .slider-btn { width: 40px; height: 40px; font-size: 0.85rem; }
  .slider-btn-prev { left: 6px; }
  .slider-btn-next { right: 6px; }
  .whatsapp-float { width: 50px; height: 50px; font-size: 1.4rem; bottom: 84px; right: 24px; }
  #back-to-top { width: 42px; height: 42px; bottom: 24px; right: 24px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .contact-email { font-size: 1rem; padding: 14px 24px; }
  .contact-whatsapp { font-size: 0.9rem; padding: 12px 28px; }
  .skills-grid, .services-grid, .projects-grid { grid-template-columns: 1fr; }
  .slide-content { padding: 24px 20px; }
  .slide-content h3 { font-size: 1.2rem; }
}