/* ── DESIGN TOKENS ── */
:root {
  --navy:        #070d1a;
  --navy-2:      #0d1629;
  --navy-3:      #111e36;
  --navy-4:      #1a2d4a;
  --gold:        #e8a020;
  --gold-light:  #f5c060;
  --gold-dim:    rgba(232,160,32,0.15);
  --cyan:        #38bdf8;
  --cyan-dim:    rgba(56,189,248,0.12);
  --white:       #f0f4ff;
  --white-60:    rgba(240,244,255,0.6);
  --white-30:    rgba(240,244,255,0.3);
  --white-10:    rgba(240,244,255,0.07);
  --glass-bg:    rgba(255,255,255,0.04);
  --glass-border:rgba(255,255,255,0.09);
  --sidebar-w:   72px;
  --sidebar-w-open: 220px;
  --radius:      14px;
  --radius-sm:   8px;
  --transition:  0.35s cubic-bezier(.4,0,.2,1);
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--navy);
  color: var(--white);
  font-family: 'DM Sans', sans-serif;
  font-weight: 300;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ── TYPOGRAPHY ── */
h1,h2,h3,h4 { font-family: 'Syne', sans-serif; font-weight: 700; line-height: 1.15; }
.gold { color: var(--gold); }

/* ── SIDEBAR ── */
.sidebar {
  position: fixed;
  left: 0; top: 0;
  height: 100vh;
  width: var(--sidebar-w);
  background: rgba(7,13,26,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 0;
  z-index: 100;
  transition: width var(--transition);
  overflow: hidden;
}
.sidebar:hover {
  width: var(--sidebar-w-open);
}
.sidebar-logo {
  margin-bottom: 40px;
  flex-shrink: 0;
}
.logo-mark {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  background: var(--gold-dim);
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
}
.nav-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  flex: 1;
  padding: 0 12px;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
  color: var(--white-60);
  font-size: 0.875rem;
  font-weight: 400;
  overflow: hidden;
}
.nav-link:hover,
.nav-link.active {
  background: var(--white-10);
  color: var(--white);
}
.nav-link.active .nav-icon { color: var(--gold); }
.nav-icon {
  font-size: 1rem;
  flex-shrink: 0;
  width: 20px;
  text-align: center;
  color: var(--white-30);
  transition: color var(--transition);
}
.nav-label {
  font-size: 0.875rem;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--transition), transform var(--transition);
  pointer-events: none;
}
.sidebar:hover .nav-label,
.sidebar.open .nav-label {
  opacity: 1;
  transform: translateX(0);
}
.sidebar-socials {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 8px;
}
.sidebar-socials a {
  color: var(--white-30);
  transition: color var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.sidebar-socials a:hover { color: var(--gold); }
.sidebar-socials svg { width: 18px; height: 18px; }

/* ── HAMBURGER ── */
.hamburger {
  display: none;
  position: fixed;
  top: 18px; left: 18px;
  z-index: 200;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 10px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── MAIN CONTENT ── */
.main-content {
  margin-left: var(--sidebar-w);
  transition: margin-left var(--transition);
}

/* ── SECTIONS ── */
.section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 64px 80px 72px;
  position: relative;
}
.section-inner { max-width: 1000px; width: 100%; }
.section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 52px;
}
.section-tag {
  font-family: 'Syne', sans-serif;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--gold);
  opacity: 0.7;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
}
.section-header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--glass-border);
  margin-left: 8px;
}

/* ── GLASS ── */
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius);
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.btn-primary {
  background: var(--gold);
  color: var(--navy);
}
.btn-primary:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232,160,32,0.3);
}
.btn-ghost {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--glass-border);
}
.btn-ghost:hover {
  background: var(--white-10);
  border-color: var(--white-30);
  transform: translateY(-2px);
}
.full-width { width: 100%; justify-content: center; }

/* ── HERO ── */
.hero-section {
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(56,189,248,0.04) 0%, transparent 70%),
              radial-gradient(ellipse 60% 40% at 20% 80%, rgba(232,160,32,0.05) 0%, transparent 60%),
              var(--navy);
}
#particles-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 700px;
}
.hero-eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.8s 0.2s forwards;
}
.hero-name {
  font-size: clamp(3rem, 7vw, 5.5rem);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeUp 0.8s 0.4s forwards;
}
.hero-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 600;
  color: var(--white-60);
  margin-bottom: 10px;
  opacity: 0;
  animation: fadeUp 0.8s 0.55s forwards;
}
.hero-sub {
  font-size: 0.95rem;
  color: var(--white-30);
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 0.8s 0.7s forwards;
}
.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.85s forwards;
}
.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.scroll-indicator span {
  display: block;
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent, var(--gold));
  margin: 0 auto;
  animation: scrollPulse 2s ease-in-out infinite;
}

/* ── ABOUT ── */
.about-section { background: var(--navy-2); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-text p {
  margin-bottom: 18px;
  color: var(--white-60);
  font-size: 1rem;
  line-height: 1.8;
}
.about-text p:last-child { margin-bottom: 0; }
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.stat-card {
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: transform var(--transition), border-color var(--transition);
}
.stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
}
.stat-number {
  font-family: 'Syne', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
}
.stat-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--white);
  margin-top: 4px;
}
.stat-sub {
  font-size: 0.72rem;
  color: var(--white-30);
}

/* ── EXPERIENCE ── */
.experience-section { background: var(--navy); }
.timeline { display: flex; flex-direction: column; gap: 0; }
.timeline-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 24px;
  padding-bottom: 40px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 22px;
}
.marker-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--navy);
  box-shadow: 0 0 0 3px var(--gold-dim);
  flex-shrink: 0;
}
.marker-line {
  flex: 1;
  width: 1px;
  background: var(--glass-border);
  margin-top: 8px;
}
.timeline-card { padding: 28px 30px; }
.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.job-title {
  font-size: 1.1rem;
  margin-bottom: 4px;
}
.job-company { font-size: 0.875rem; color: var(--white-60); }
.job-period {
  font-size: 0.75rem;
  color: var(--gold);
  background: var(--gold-dim);
  padding: 4px 12px;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
}
.job-bullets {
  padding-left: 20px;
  list-style: disc;
  color: var(--white-60);
  font-size: 0.9rem;
  line-height: 1.75;
  margin-bottom: 16px;
}
.job-bullets li { margin-bottom: 6px; }
.job-desc { color: var(--white-60); font-size: 0.9rem; margin-bottom: 16px; }
.job-tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* ── TAGS ── */
.tag {
  font-size: 0.72rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--white-10);
  border: 1px solid var(--glass-border);
  color: var(--white-60);
  font-weight: 400;
}
.tag-gold {
  background: var(--gold-dim);
  border-color: rgba(232,160,32,0.3);
  color: var(--gold-light);
}

/* ── PROJECTS ── */
.projects-section { background: var(--navy-2); }
.featured-project {
  padding: 36px;
  margin-bottom: 48px;
  position: relative;
  overflow: hidden;
}
.featured-project::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(232,160,32,0.04) 0%, transparent 60%);
  pointer-events: none;
}
.featured-badge {
  font-family: 'Syne', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.featured-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.featured-title {
  font-size: 1.6rem;
  margin-bottom: 14px;
}
.featured-desc {
  color: var(--white-60);
  font-size: 0.925rem;
  line-height: 1.8;
  margin-bottom: 14px;
}
.featured-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }

/* ── PROJECT DIAGRAM ── */
.project-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px;
  background: var(--navy);
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
}
.diagram-node {
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  text-align: center;
  width: 100%;
  max-width: 200px;
}
.transmitter { background: var(--cyan-dim); border: 1px solid rgba(56,189,248,0.25); }
.receiver    { background: var(--gold-dim);  border: 1px solid rgba(232,160,32,0.25); }
.node-label  { display: block; font-family: 'Syne', sans-serif; font-size: 0.8rem; font-weight: 700; margin-bottom: 4px; }
.node-sub    { display: block; font-size: 0.68rem; color: var(--white-60); line-height: 1.5; }
.diagram-wave {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
}
.wave-line {
  width: 2px;
  height: 32px;
  background: linear-gradient(to bottom, var(--cyan), var(--gold));
}
.wave-label {
  font-size: 0.68rem;
  text-align: center;
  color: var(--white-30);
  line-height: 1.5;
}
.diagram-cloud {
  margin-top: 4px;
  padding: 10px 20px;
  background: rgba(56,189,248,0.06);
  border: 1px dashed rgba(56,189,248,0.2);
  border-radius: var(--radius-sm);
  text-align: center;
}
.cloud-label { display: block; font-size: 0.78rem; font-weight: 500; }
.cloud-sub   { display: block; font-size: 0.65rem; color: var(--white-30); }
.sub-heading {
  font-family: 'Syne', sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--white-30);
  margin-bottom: 20px;
}
.projects-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.project-card { padding: 24px; transition: transform var(--transition), border-color var(--transition); }
.project-card:hover { transform: translateY(-4px); border-color: var(--gold); }
.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.project-icon { font-size: 1.4rem; }
.project-year { font-size: 0.72rem; color: var(--white-30); }
.project-card h4 { font-size: 1rem; margin-bottom: 8px; }
.project-card p { font-size: 0.875rem; color: var(--white-60); line-height: 1.7; margin-bottom: 14px; }
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }

/* ── SKILLS ── */
.skills-section { background: var(--navy); }
.skills-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.skill-group { padding: 24px; transition: border-color var(--transition); }
.skill-group:hover { border-color: rgba(232,160,32,0.3); }
.skill-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.skill-icon { font-size: 1.2rem; }
.skill-group-header h4 { font-size: 0.95rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }

/* ── CERTIFICATIONS ── */
.certs-section { background: var(--navy-2); }
.certs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.cert-card {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: transform var(--transition), border-color var(--transition);
}
.cert-card:hover { transform: translateY(-4px); border-color: var(--gold); }
.cert-issuer-badge {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.aws     { background: rgba(255,153,0,0.15);  border: 1px solid rgba(255,153,0,0.3);  color: #ff9900; }
.mathworks { background: rgba(232,160,32,0.15); border: 1px solid rgba(232,160,32,0.3); color: var(--gold); }
.ibm     { background: rgba(56,189,248,0.12); border: 1px solid rgba(56,189,248,0.25); color: var(--cyan); }
.fcc     { background: rgba(0,200,150,0.12);  border: 1px solid rgba(0,200,150,0.25); color: #00c896; }
.plp     { background: rgba(160,80,255,0.12); border: 1px solid rgba(160,80,255,0.25); color: #a050ff; }
.cert-info h4 { font-size: 0.875rem; margin-bottom: 3px; }
.cert-info p  { font-size: 0.72rem; color: var(--white-30); }
.cert-year    { font-size: 0.68rem; color: var(--gold); display: block; margin-top: 4px; }

/* ── LEADERSHIP ── */
.leadership-section { background: var(--navy); }
.leadership-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; }
.leadership-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform var(--transition), border-color var(--transition);
}
.leadership-card:hover { transform: translateY(-4px); border-color: var(--gold); }
.leadership-icon { font-size: 1.5rem; }
.leadership-card h4 { font-size: 0.95rem; }
.leadership-card p  { font-size: 0.85rem; color: var(--white-60); flex: 1; }
.leadership-year    { font-size: 0.72rem; color: var(--gold); }

/* ── CONTACT ── */
.contact-section { background: var(--navy-2); flex-direction: column; justify-content: flex-start; padding-top: 100px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-intro { color: var(--white-60); font-size: 1rem; line-height: 1.8; margin-bottom: 28px; }
.contact-links { display: flex; flex-direction: column; gap: 12px; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  transition: transform var(--transition), border-color var(--transition);
}
.contact-link:hover { transform: translateX(4px); border-color: var(--gold); }
.contact-link-icon {
  width: 36px; height: 36px;
  background: var(--gold-dim);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem;
  color: var(--gold);
  font-weight: 700;
  flex-shrink: 0;
}
.contact-link-label { display: block; font-size: 0.7rem; color: var(--white-30); }
.contact-link-value { display: block; font-size: 0.875rem; color: var(--white); }
.contact-form { padding: 32px; display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.8rem; color: var(--white-60); font-weight: 500; }
.form-group input,
.form-group textarea {
  background: var(--white-10);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--white);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  resize: none;
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--gold);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--white-30); }
.form-success {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 12px;
  padding: 48px 24px;
  min-height: 280px;
}
.form-success-icon {
  font-size: 2rem;
  color: var(--gold);
  animation: fadeUp 0.5s ease forwards;
}
.form-success h4 {
  font-size: 1.3rem;
  color: var(--white);
  animation: fadeUp 0.5s 0.1s ease both;
}
.form-success p {
  font-size: 0.9rem;
  color: var(--white-60);
  animation: fadeUp 0.5s 0.2s ease both;
}
.footer {
  text-align: center;
  padding: 40px 0 20px;
  color: var(--white-30);
  font-size: 0.78rem;
}

/* ── REVEAL ANIMATION ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── KEYFRAMES ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scrollPulse {
  0%,100% { opacity: 0.3; transform: scaleY(0.8); }
  50%     { opacity: 1;   transform: scaleY(1); }
}

/* ── MOBILE ── */
@media (max-width: 900px) {
  .sidebar { display: none; }
  .hamburger { display: flex; }
  .main-content { margin-left: 0; }
  .section { padding: 80px 24px; }
  .about-grid,
  .featured-content,
  .contact-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .hero-name { font-size: clamp(2.4rem, 10vw, 3.5rem); }

  /* mobile sidebar overlay */
  .sidebar.open {
    display: flex;
    width: var(--sidebar-w-open);
    z-index: 150;
  }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(7,13,26,0.7);
    z-index: 140;
  }
  .sidebar-overlay.visible { display: block; }
}

@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr; }
  .certs-grid  { grid-template-columns: 1fr; }
  .leadership-grid { grid-template-columns: 1fr; }
}