/* ── Reset & Variables ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:           #0f172a;
  --bg-alt:       #1e293b;
  --bg-card:      #1e293b;
  --border:       #334155;
  --text:         #e2e8f0;
  --text-muted:   #94a3b8;
  --accent:       #6366f1;
  --accent-hover: #818cf8;
  --accent-dim:   rgba(99, 102, 241, 0.15);
  --green:        #10b981;
  --font-sans:    'Inter', system-ui, sans-serif;
  --font-mono:    'Fira Code', monospace;
  --max-w:        1100px;
  --nav-h:        70px;
  --transition:   0.2s ease;
  --radius:       8px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-hover); }

ul { list-style: none; }

/* ── Layout helpers ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}
.section-title::after {
  content: '';
  display: block;
  height: 1px;
  background: var(--border);
  flex: 1;
  min-width: 60px;
}
.section-num {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9em;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99,102,241,0.3);
}
.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent-dim);
  color: var(--accent-hover);
  transform: translateY(-2px);
}
.btn-lg { padding: 16px 40px; font-size: 1.05rem; }

/* ── Nav ── */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
#site-header.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  padding: 6px 10px;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  line-height: 1;
}
.nav-logo:hover { color: var(--accent-hover); border-color: var(--accent-hover); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--text); background: var(--accent-dim); }
.btn-nav {
  color: var(--accent) !important;
  border: 1px solid var(--accent);
  padding: 7px 16px !important;
}
.btn-nav:hover { background: var(--accent-dim) !important; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
}

/* ── Hero ── */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  padding-top: var(--nav-h);
  padding-bottom: 40px;
  position: relative;
  z-index: 1;
}

.hero-greeting {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: 8px;
}
.hero-name {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 8px;
}
.hero-title {
  font-size: clamp(1.4rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 1.4em;
}
.cursor {
  animation: blink 1s step-end infinite;
  color: var(--accent);
}
@keyframes blink { 50% { opacity: 0; } }

.hero-summary {
  max-width: 560px;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 36px;
}
.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-socials {
  display: flex;
  gap: 20px;
}
.hero-socials a {
  color: var(--text-muted);
  transition: color var(--transition), transform var(--transition);
}
.hero-socials a:hover { color: var(--accent); transform: translateY(-3px); }
.hero-socials svg { width: 24px; height: 24px; display: block; }

/* bg grid */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.15;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black 30%, transparent 100%);
}

/* ── About ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 60px;
  align-items: start;
}
.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
}
.about-text strong { color: var(--text); }
.about-tech-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 24px;
  margin-top: 16px;
}
.about-tech-list li {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  padding-left: 16px;
  position: relative;
}
.about-tech-list li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
}

.avatar-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--radius);
  overflow: hidden;
  border: 2px solid var(--accent);
  box-shadow: 6px 6px 0 var(--accent-dim);
  transition: transform var(--transition), box-shadow var(--transition);
}
.avatar-frame:hover {
  transform: translate(-4px, -4px);
  box-shadow: 10px 10px 0 var(--accent-dim);
}
.avatar-placeholder {
  width: 100%;
  height: 100%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -2px;
}

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

/* ── Skills ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}
.skill-category {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition);
}
.skill-category:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.skill-category h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-family: var(--font-mono);
  margin-bottom: 16px;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-tags span {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 20px;
  font-family: var(--font-mono);
  transition: border-color var(--transition), color var(--transition);
}
.skill-category:hover .skill-tags span {
  border-color: var(--accent);
  color: var(--text);
}

/* ── Experience Timeline ── */
.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -25px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: border-color var(--transition), transform var(--transition);
}
.timeline-content:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}
.timeline-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 14px;
}
.timeline-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}
.timeline-company {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent);
}
.timeline-date {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}
.timeline-content ul {
  padding-left: 0;
}
.timeline-content li {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}
.timeline-content li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ── Education ── */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.edu-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: border-color var(--transition), transform var(--transition);
}
.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.edu-icon { font-size: 2rem; flex-shrink: 0; }
.edu-details h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.edu-school {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  margin-bottom: 4px;
}
.edu-date {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.cert-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}
.cert-btn {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  transition: background var(--transition), color var(--transition);
}
.cert-btn:hover {
  background: var(--accent);
  color: #fff;
}
.cert-btn-dl {
  border-color: var(--green);
  color: var(--green);
}
.cert-btn-dl:hover {
  background: var(--green);
  color: #fff;
}
.comp-dl {
  color: var(--green);
}
.comp-dl:hover { color: #34d399; }

/* ── Projects ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.project-icon { font-size: 2rem; }
.project-links {
  display: flex;
  gap: 14px;
}
.project-links a {
  color: var(--text-muted);
  transition: color var(--transition), transform var(--transition);
}
.project-links a:hover { color: var(--accent); transform: translateY(-2px); }
.project-links svg { width: 20px; height: 20px; display: block; }
.project-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}
.project-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
}
.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}
.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.project-tech span:not(:last-child)::after {
  content: ' ·';
}

/* ── Equipment Section ── */
.section-subtitle {
  color: var(--text-muted);
  margin-top: -32px;
  margin-bottom: 40px;
  font-size: 0.95rem;
}

.equipment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.equipment-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.equipment-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}

.equipment-img-wrap {
  width: 100%;
  height: 180px;
  overflow: hidden;
  position: relative;
  background: var(--bg-alt);
}
.equipment-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.equipment-card:hover .equipment-img-wrap img {
  transform: scale(1.05);
}
/* fallback icon if image fails */
.equipment-img-fallback {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  background: var(--bg-alt);
}
.equipment-img-wrap.img-error img { display: none; }
.equipment-img-wrap.img-error .equipment-img-fallback { display: flex; }

.equipment-info {
  padding: 20px 24px;
}
.equipment-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}
.equipment-info p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 12px;
}
.equipment-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.comp-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  transition: color var(--transition);
}
.comp-link:hover { color: var(--accent-hover); }
.equipment-badge {
  display: inline-block;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 10px;
}

/* ── Referees ── */
.referee-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.referee-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: border-color var(--transition), transform var(--transition);
}
.referee-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.referee-icon { font-size: 2rem; flex-shrink: 0; }
.referee-details h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.referee-title {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  margin-bottom: 2px;
}
.referee-company {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
}
.referee-phone {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.referee-phone:hover { color: var(--accent); }

/* ── Contact ── */
.contact-inner {
  text-align: center;
  max-width: 600px;
}
.contact-blurb {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 36px;
}
.contact-links {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
}
.contact-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.contact-links a:hover { color: var(--accent); }

.contact-location {
  margin-top: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ── Footer ── */
footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 24px 0;
}
.footer-inner {
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: fixed; inset: var(--nav-h) 0 0 0; background: var(--bg); padding: 40px 24px; gap: 4px; z-index: 99; }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.1rem; padding: 12px 16px; }
  .nav-toggle { display: block; }

  .about-grid { grid-template-columns: 1fr; }
  .about-avatar { max-width: 200px; margin: 0 auto; }
  .avatar-placeholder { font-size: 2.5rem; }

  .timeline-date { margin-left: 0; }

  .section-inner { padding: 70px 0; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}