/* ========================================
   Layout — Header, Sections, Footer
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 3px;
  background: var(--accent);
  border-radius: var(--radius-full);
}

.section-header p {
  margin-top: var(--space-lg);
  font-size: 1.125rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Header / Navigation ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  transition: all var(--transition);
  padding: var(--space-md) 0;
}

.header.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--nav-border);
  padding: var(--space-sm) 0;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1rem;
}

.logo-icon svg {
  width: 21px;
  height: 21px;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  position: relative;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--accent-light);
  color: var(--accent);
  transform: rotate(15deg);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Hero Section ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--bg-hero);
  opacity: 0.08;
  z-index: 0;
}

.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.3;
  animation: float-up linear infinite;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--space-xl);
}

.hero-avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  margin: 0 auto var(--space-xl);
  object-fit: cover;
  object-position: center 28%;
  border: 4px solid var(--accent);
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-avatar:hover {
  transform: scale(1.05);
  box-shadow: 0 0 40px var(--accent-glow);
}

.hero h1 {
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.hero-bio {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
  text-align: left;
  white-space: pre-line;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Social Links ── */
.social-links {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-top: var(--space-xl);
}

.social-link {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  border: 1px solid var(--border);
}

.social-link:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

/* ── About Section ── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-image {
  position: sticky;
  top: 120px;
}

.about-image img {
  width: 100%;
  max-width: 300px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  object-position: center 28%;
  box-shadow: var(--shadow-lg);
}

.about-content h3 {
  margin-bottom: var(--space-md);
  color: var(--accent);
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin: var(--space-xl) 0;
}

.highlight-item {
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.highlight-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.highlight-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.highlight-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
}

.skills-grid {
  margin-top: var(--space-xl);
}

.skills-grid h4 {
  margin-bottom: var(--space-lg);
}

.skill-item {
  margin-bottom: var(--space-lg);
}

.skill-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
  font-size: 0.9375rem;
}

.skill-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: var(--radius-full);
  transition: width 1s ease;
  width: var(--skill-level, 0);
}

/* ── Projects Section ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-xl);
}

/* ── Certifications Section ── */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-left: 64px;
  padding-bottom: var(--space-2xl);
}

.timeline-dot {
  position: absolute;
  left: 16px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: all var(--transition-fast);
}

.timeline-content:hover {
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.timeline-date {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.timeline-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.timeline-issuer {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

/* ── Blog Section ── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: var(--space-xl);
}

/* ── Footer ── */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-link {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-link:hover {
  color: var(--accent);
}