:root {
  --bg: #0b0f19;
  --bg-alt: #111827;
  --surface: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --border: #2f3b4f;

  --radius: 0.75rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --container: 1100px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, #0b0f19 0%, #0d1321 100%);
  color: var(--text);
  line-height: 1.6;
}

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

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

.container {
  width: min(92%, var(--container));
  margin-inline: auto;
}

.section {
  padding: var(--space-2xl) 0;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 var(--space-md);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  margin-bottom: var(--space-lg);
}

p {
  margin: 0 0 var(--space-md);
  color: var(--muted);
}

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(11, 15, 25, 0.9);
  border-bottom: 1px solid var(--border);
}

.navbar {
  min-height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand {
  color: var(--text);
  font-weight: 700;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--muted);
  font-weight: 500;
  position: relative;
  transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 100%;
  height: 2px;
  background: var(--primary);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: var(--space-xs);
}

.menu-toggle span {
  display: block;
  width: 1.5rem;
  height: 2px;
  background: var(--text);
  margin: 0.3rem 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.lang-toggle {
  border: 1px solid var(--border);
  background: #0f172a;
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.65rem;
  font-weight: 700;
  cursor: pointer;
}

.lang-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 760px;
}

.eyebrow {
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.6rem);
  margin-bottom: var(--space-md);
}

.hero-text {
  font-size: clamp(1rem, 2.4vw, 1.2rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--primary);
  color: #001522;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-outline {
  border-color: var(--border);
  color: var(--text);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--primary);
}

.projects-grid,
.skills-grid {
  display: grid;
  gap: var(--space-lg);
}

.projects-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.skills-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.project-card,
.skill-group {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.skill-group {
  position: relative;
  overflow: visible;
  padding-top: calc(var(--space-lg) + 0.5rem);
}

.project-card:hover,
.skill-group:hover {
  transform: translateY(-4px);
  border-color: #3b4c68;
}

.project-card {
  position: relative;
  overflow: visible;
  padding-top: calc(var(--space-lg) + 0.45rem);
}

.project-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 10%, rgba(56, 189, 248, 0.16), transparent 55%);
  opacity: 0.1;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.project-card:hover::after {
  opacity: 1;
}

.project-industry-badge {
  position: absolute;
  top: -0.85rem;
  right: 0.95rem;
  transform: none;
  z-index: 2;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(56, 189, 248, 0.45);
  background: linear-gradient(180deg, #0f1b31 0%, #101a2d 100%);
  color: #bfe9ff;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  box-shadow: 0 8px 20px rgba(3, 10, 22, 0.45);
  white-space: nowrap;
  transition: border-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.project-card:hover .project-industry-badge {
  border-color: rgba(56, 189, 248, 0.75);
  color: #e7f8ff;
  transform: translateY(-1px);
}

.company-logo {
  width: 2rem;
  height: 2rem;
  border-radius: 0.45rem;
  object-fit: cover;
  border: 1px solid #2f4f7a;
  background: #0f172a;
}

.project-header,
.timeline-company {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.project-header h3,
.timeline-company span {
  margin: 0;
}

.stack {
  color: #c7d2fe;
  margin-bottom: var(--space-sm);
}

.stack-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: var(--space-sm);
  opacity: 0.38;
  filter: saturate(0.8);
  transition: opacity 0.25s ease, filter 0.25s ease, transform 0.25s ease;
}

.stack-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.6rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #c7e9ff;
  font-size: 0.78rem;
  line-height: 1;
}

.stack-tech-icon,
.stack-fallback-icon {
  font-size: 0.82rem;
}

.project-card:hover .stack-badges {
  opacity: 1;
  filter: saturate(1);
  transform: translateY(-1px);
}

.project-description {
  color: #7e8da4;
  opacity: 0.72;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 6.2em;
  transition: opacity 0.25s ease, color 0.25s ease, -webkit-line-clamp 0.25s ease;
}

.project-card:hover .project-description {
  opacity: 1;
  color: var(--muted);
  -webkit-line-clamp: unset;
}

.timeline {
  position: relative;
  display: grid;
  gap: var(--space-lg);
  padding-left: 1.25rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.2rem;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 1.4rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

.timeline-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 12% 10%, rgba(56, 189, 248, 0.22), transparent 52%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.timeline-item:hover {
  border-color: #3d5576;
  box-shadow: 0 14px 28px rgba(5, 12, 24, 0.35);
  transform: translateY(-2px);
}

.timeline-item:hover::after {
  opacity: 1;
}

.timeline-date {
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.timeline-meta {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-bottom: 0;
  transform: translateY(-4px);
  transition: max-height 0.25s ease, opacity 0.2s ease, transform 0.25s ease, margin-bottom 0.25s ease;
}

.timeline-item:hover .timeline-meta {
  max-height: 2rem;
  opacity: 1;
  margin-bottom: var(--space-xs);
  transform: translateY(0);
}

.timeline-role {
  color: #cbd5e1;
  font-weight: 600;
}

.timeline-impact {
  margin: 0 0 var(--space-sm);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-4px);
  transition: max-height 0.3s ease, opacity 0.25s ease, transform 0.3s ease, margin-bottom 0.3s ease;
}

.timeline-impact h4 {
  margin: 0 0 0.35rem;
  font-size: 0.84rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #9ddfff;
}

.timeline-impact ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.timeline-impact li {
  margin-bottom: 0.2rem;
}

.timeline-item:hover .timeline-impact {
  max-height: 16rem;
  opacity: 1;
  margin-bottom: var(--space-sm);
  transform: translateY(0);
}

.project-badge-link {
  margin-top: var(--space-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid #2f4f7a;
  background: rgba(15, 30, 56, 0.72);
  color: #dde8f7;
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.9rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.project-badge-link:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
}

.project-badge-icon {
  width: 1.3rem;
  height: 1.3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.35rem;
  background: rgba(56, 189, 248, 0.14);
  color: #79d6ff;
}

.project-badge-icon svg {
  width: 0.85rem;
  height: 0.85rem;
  fill: currentColor;
}

.skill-group ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.skill-group h3 {
  position: absolute;
  top: -0.7rem;
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0.3rem 0.95rem;
  border-radius: 999px;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  background: #2a1f4f;
  border: 1px solid rgba(139, 92, 246, 0.42);
  color: #d7c8ff;
  white-space: nowrap;
  min-width: 7.5rem;
}

.skill-group li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-group li i {
  font-size: 1rem;
}

.skill-custom-icon {
  width: 1rem;
  height: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #8ddcff;
  font-size: 0.6rem;
  font-weight: 700;
  border-radius: 999px;
  border: 1px solid #2f4f7a;
  background: rgba(15, 30, 56, 0.72);
}

.skill-custom-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.skill-icon-signalr {
  color: #58b8ff;
}

.skill-icon-copilot {
  color: #d1d5db;
}

.skill-icon-claude {
  color: #f8b26a;
  border-color: rgba(248, 178, 106, 0.45);
}

.skill-icon-cursor {
  color: #6bb8ff;
}

.skill-icon-chatgpt {
  color: #53c28b;
  border-color: rgba(83, 194, 139, 0.45);
}

.skill-icon-codex {
  color: #9be24f;
  border-color: rgba(155, 226, 79, 0.45);
}

.stack-fallback-icon {
  color: #8ddcff;
}

.contact-intro {
  max-width: 760px;
  margin-bottom: var(--space-xl);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.contact-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  border: 1px solid #2f4f7a;
  background: rgba(15, 30, 56, 0.6);
  color: #dbeafe;
  font-size: 0.88rem;
  transition: border-color 0.25s ease, transform 0.25s ease, color 0.25s ease;
}

a.contact-chip:hover {
  transform: translateY(-1px);
  border-color: var(--primary);
  color: #eef9ff;
}

.contact-chip.static {
  border-color: #334155;
  color: #a5b4c8;
}

.contact-expand {
  gap: 0.45rem;
  overflow: hidden;
}

.contact-chip-icon {
  width: 1.2rem;
  height: 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #94a3b8;
}

.contact-phone-icon svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

.contact-chip-text {
  max-width: 0;
  opacity: 0;
  white-space: nowrap;
  transition: max-width 0.28s ease, opacity 0.2s ease;
}

.contact-expand:hover .contact-chip-text {
  max-width: 16rem;
  opacity: 1;
}

.contact-location-text {
  color: #a5b4c8;
  font-size: 0.9rem;
  align-self: center;
}

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
}

.certificate-card {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
}

.certificate-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.certificate-date {
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.certificate-institution {
  color: #cbd5e1;
  margin-bottom: 0.6rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.institution-logo {
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 0.3rem;
  object-fit: cover;
  border: 1px solid #2f4f7a;
}

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) 0;
  text-align: center;
}

/* Fade-in utility for intersection observer */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes projectFlash {
  0% {
    transform: translateY(-4px) scale(1);
    border-color: #58b8ff;
    box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4);
  }
  60% {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 0 0 10px rgba(56, 189, 248, 0);
  }
  100% {
    transform: translateY(-4px) scale(1);
    border-color: #3b4c68;
    box-shadow: none;
  }
}

.project-card.pulse-highlight {
  animation: projectFlash 1s ease;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    right: 4%;
    width: min(280px, 90vw);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: #0f172a;
    display: none;
  }

  .lang-toggle {
    order: 3;
    margin-left: auto;
  }

  .nav-links.show {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-top: var(--space-xl);
  }
}