/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --bg-primary: #0a0f1e;
  --bg-secondary: #0d1526;
  --bg-card: #111827;
  --bg-card-hover: #1a2438;
  --accent: #00d4ff;
  --accent-secondary: #7c3aed;
  --accent-green: #10b981;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255,255,255,0.08);
  --border-accent: rgba(0, 212, 255, 0.3);
  --gradient: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(0,212,255,0.1) 0%, rgba(124,58,237,0.1) 100%);
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
  --radius: 12px;
  --radius-lg: 20px;
  --nav-height: 70px;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================
   Reset & Base
   =========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { opacity: 0.85; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ===========================
   Scrollbar
   =========================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.25rem; }

/* ===========================
   Layout
   =========================== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 3px;
  display: block;
  margin-bottom: 12px;
}
.section-title { color: var(--text-primary); }
.section-desc { color: var(--text-secondary); margin-top: 16px; font-size: 1.1rem; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.4);
  opacity: 1;
}
.btn-outline {
  border-color: var(--accent);
  color: var(--accent);
  background: transparent;
}
.btn-outline:hover {
  background: rgba(0, 212, 255, 0.1);
  transform: translateY(-2px);
  opacity: 1;
}
.btn-ghost {
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
  opacity: 1;
}
.btn-full { width: 100%; justify-content: center; }

/* ===========================
   Navbar
   =========================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition);
  padding: 0 24px;
}
.navbar.scrolled {
  background: rgba(10, 15, 30, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-mono);
  letter-spacing: -1px;
}
.nav-logo .dot { color: var(--accent); }
.nav-links {
  display: flex;
  gap: 36px;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  transition: var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--text-primary); opacity: 1; }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after { width: 100%; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================
   Hero Section
   =========================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--nav-height) 24px 0;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,212,255,0.15) 0%, transparent 60%),
              radial-gradient(ellipse 60% 40% at 80% 80%, rgba(124,58,237,0.1) 0%, transparent 50%),
              var(--bg-primary);
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}
.hero-content {
  position: relative;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 28px;
}
.status-dot {
  width: 8px; height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.8); }
}
.hero-title {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
  background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 400;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-description {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 32px;
  line-height: 1.8;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 36px;
}
.tag {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  transition: var(--transition);
}
.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

/* ===========================
   About Section
   =========================== */
.about-section { background: var(--bg-secondary); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 64px;
  align-items: start;
}
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}
.about-text strong { color: var(--text-primary); }
.about-highlights { margin-top: 32px; display: flex; flex-direction: column; gap: 12px; }
.highlight {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.highlight-icon { font-size: 1.1rem; flex-shrink: 0; }
.availability-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.avail-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--accent-green);
  margin-bottom: 24px;
  font-size: 0.95rem;
}
.avail-dot {
  width: 10px; height: 10px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
.avail-options { display: flex; flex-direction: column; gap: 16px; margin-bottom: 24px; }
.avail-option {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px;
  background: var(--gradient-subtle);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
}
.avail-icon { font-size: 1.4rem; flex-shrink: 0; }
.avail-option strong { display: block; color: var(--text-primary); font-size: 0.95rem; }
.avail-option p { color: var(--text-muted); font-size: 0.82rem; margin: 2px 0 0; }

/* ===========================
   Skills Section
   =========================== */
.skills-section { background: var(--bg-primary); }
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.skill-category:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.skill-cat-title {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.cat-icon { font-size: 1.1rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 12px;
  border-radius: 5px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  transition: var(--transition);
}
.skill-tag.expert {
  background: rgba(0, 212, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.25);
  color: var(--accent);
}
.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===========================
   Certifications Section
   =========================== */
.cert-section { background: var(--bg-secondary); }
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 20px;
}
.cert-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.cert-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--gradient);
}
.cert-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.cert-logo {
  width: 60px; height: 60px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  flex-shrink: 0;
  font-family: var(--font-mono);
}
.gcp-logo { background: linear-gradient(135deg, #4285f4, #34a853); color: #fff; }
.pe-logo { background: linear-gradient(135deg, #7c3aed, #00d4ff); color: #fff; }
.cert-info { flex: 1; }
.cert-info h3 { font-size: 1rem; color: var(--text-primary); margin-bottom: 4px; }
.cert-issuer { color: var(--text-secondary); font-size: 0.85rem; }
.cert-id { color: var(--text-muted); font-size: 0.75rem; font-family: var(--font-mono); margin-top: 4px; }
.cert-badge {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: var(--accent-green);
  padding: 4px 10px;
  border-radius: 5px;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* ===========================
   Experience / Timeline
   =========================== */
.experience-section { background: var(--bg-primary); }
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 8px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-secondary), transparent);
}
.timeline-item { position: relative; margin-bottom: 48px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -28px; top: 24px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--gradient);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
}
.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.timeline-content:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow);
}
.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.exp-title { font-size: 1.1rem; color: var(--text-primary); margin-bottom: 4px; }
.exp-company {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
}
.exp-company:hover { opacity: 0.8; }
.exp-date {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  white-space: nowrap;
  background: rgba(255,255,255,0.04);
  padding: 4px 10px;
  border-radius: 5px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}
.exp-summary {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  line-height: 1.7;
}
.exp-bullets { margin-bottom: 16px; }
.exp-bullets li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 4px 0 4px 18px;
  position: relative;
  line-height: 1.6;
}
.exp-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
}
.exp-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.exp-stack span {
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid rgba(124, 58, 237, 0.2);
  color: #a78bfa;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

/* ===========================
   Contact Section
   =========================== */
.contact-section { background: var(--bg-secondary); }
.contact-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: var(--transition);
}
.contact-card:hover { border-color: var(--border-accent); }
.contact-icon { font-size: 1.5rem; flex-shrink: 0; }
.contact-card h4 { color: var(--text-secondary); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; font-weight: 500; }
.contact-card a, .contact-card p { color: var(--text-primary); font-size: 0.9rem; }
.contact-card small { color: var(--text-muted); font-size: 0.8rem; }
.consulting-note {
  background: var(--gradient-subtle);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 8px;
}
.consulting-note h4 { color: var(--accent); font-size: 0.9rem; margin-bottom: 8px; }
.consulting-note p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.7; }

/* Contact Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.85rem; font-weight: 500; color: var(--text-secondary); }
.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  transition: var(--transition);
  outline: none;
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-muted); }
.form-group select option { background: var(--bg-card); }
.form-group input.error,
.form-group select.error,
.form-group textarea.error { border-color: #f87171; }
.form-note { color: var(--text-muted); font-size: 0.8rem; text-align: center; }

/* ===========================
   Footer
   =========================== */
.footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 48px 24px 24px; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.footer-logo { font-size: 1.4rem; font-weight: 800; font-family: var(--font-mono); color: var(--text-primary); }
.footer-logo .dot { color: var(--accent); }
.footer-left p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 4px; }
.footer-sub { color: var(--text-muted) !important; font-size: 0.8rem !important; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); font-size: 0.85rem; transition: var(--transition); }
.footer-links a:hover { color: var(--accent); opacity: 1; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  text-align: center;
}
.footer-bottom p { color: var(--text-muted); font-size: 0.8rem; }
.footer-bottom a { color: var(--accent); }

/* ===========================
   Toast Notification
   =========================== */
.toast {
  position: fixed;
  bottom: 32px; right: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition);
  z-index: 9999;
  max-width: 360px;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { border-color: rgba(16, 185, 129, 0.4); }
.toast.error { border-color: rgba(248, 113, 113, 0.4); }
.toast-icon { font-size: 1.2rem; flex-shrink: 0; }
.toast-message { color: var(--text-primary); font-size: 0.9rem; }

/* ===========================
   Animations
   =========================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(10, 15, 30, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 24px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.1rem; }
  .nav-toggle { display: flex; }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-stats { gap: 16px; }
  .stat-divider { display: none; }
  .skills-grid { grid-template-columns: 1fr; }
  .exp-header { flex-direction: column; align-items: flex-start; }
  .timeline { padding-left: 24px; }
  .timeline-content { padding: 20px; }
  .contact-form { padding: 24px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero-badge { font-size: 0.78rem; }
  .cert-card { flex-direction: column; text-align: center; }
  .cert-card::before { width: 100%; height: 3px; top: 0; bottom: auto; left: 0; right: 0; }
  .cert-logo { margin: 0 auto; }
  .toast { left: 16px; right: 16px; bottom: 16px; }
}

/* ===========================
   Focus Accessibility
   =========================== */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); }

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