/* =====================================================
   COMPONENTS — Navbar, Hero, Skills, Projects,
                Timeline, References, Contact, Footer
   ===================================================== */

/* ═══════════════════════════════════════════════════
   NAVBAR
   ═══════════════════════════════════════════════════ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--navbar-h);
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-slow);
}
#navbar.scrolled {
  border-bottom-color: var(--border-medium);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

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

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}
.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-glass-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Nav socials */
.nav-socials {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-social-link {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.nav-social-link:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.12);
  transform: translateY(-1px);
}
@media (max-width: 900px) {
  .nav-socials-desktop {
    display: none;
  }
}

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 0;
}
.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.lang-btn.active {
  background: var(--grad-main);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.4);
}

/* Theme toggle */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition-fast);
}
.theme-toggle:hover {
  background: rgba(99,102,241,0.15);
  border-color: var(--border-medium);
  color: var(--text-primary);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--navbar-h);
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 24px 24px;
  flex-direction: column;
  gap: 6px;
  z-index: 999;
  animation: fadeIn 0.2s ease;
}
.nav-mobile.open { display: flex; }
.nav-mobile a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  text-decoration: none;
}
.nav-mobile a:hover {
  color: var(--text-primary);
  background: var(--bg-glass-light);
}
.nav-mobile-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px 0;
  border-top: 1px solid var(--border-subtle);
  margin-top: 8px;
}

/* ═══════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════ */
#hero {
  min-height: 100vh;
  padding-top: var(--navbar-h);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.hero-bg-gradient {
  position: absolute;
  inset: 0;
  background: var(--grad-hero);
}
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99,102,241,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.05) 1px, transparent 1px);
  background-size: 40px 40px;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}
.hero-orb-1 {
  width: 600px;
  height: 600px;
  top: -200px;
  right: -100px;
  background: radial-gradient(circle, rgba(99,102,241,0.18) 0%, transparent 70%);
  animation: rotateSlow 30s linear infinite;
}
.hero-orb-2 {
  width: 400px;
  height: 400px;
  bottom: 0;
  left: -100px;
  background: radial-gradient(circle, rgba(6,182,212,0.12) 0%, transparent 70%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 64px 0 80px;
}

/* Status badge */
.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16,185,129,0.25);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-green);
  margin-bottom: 20px;
  width: fit-content;
  animation: borderGlow 2.5s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(2.8rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 10px;
}
.hero-title-sub {
  font-size: clamp(1.2rem, 2.2vw, 1.65rem);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-family: var(--font-sans);
}
.hero-title-sub span {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 500px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

/* Impact stats ribbon */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: all var(--transition-base);
}
.hero-stat:hover {
  border-color: var(--border-medium);
  background: rgba(99,102,241,0.06);
}
.hero-stat-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 3px;
}
.hero-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Hero image side */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-card {
  position: relative;
  z-index: 1;
}

.profile-ring {
  width: 340px;
  height: 340px;
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
  margin: 0 auto;
}
.profile-ring::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--grad-main);
  animation: rotateSlow 8s linear infinite;
  z-index: -1;
}
.profile-ring::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--bg-primary);
  z-index: -1;
  margin: 2px;
}

.profile-img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--bg-primary);
  position: relative;
  z-index: 1;
}

/* ── Avionics/Military style floating chips ── */
.hero-chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 7px;
  background: rgba(7, 11, 20, 0.82);
  backdrop-filter: saturate(120%) blur(12px);
  -webkit-backdrop-filter: saturate(120%) blur(12px);
  border: 1px solid rgba(99,102,241,0.30);
  border-radius: var(--radius-sm);
  padding: 6px 13px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(165, 180, 252, 0.95);
  white-space: nowrap;
  box-shadow: 0 2px 12px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.04);
  animation: floatY 4s ease-in-out infinite;
}
[data-theme='light'] .hero-chip {
  background: rgba(15, 23, 42, 0.88);
  color: rgba(165, 180, 252, 0.95);
}
.hero-chip svg {
  flex-shrink: 0;
  opacity: 0.8;
  color: var(--accent-secondary);
}
.hero-chip:nth-child(2) { animation-delay: 0.8s; }
.hero-chip:nth-child(3) { animation-delay: 1.6s; }
.hero-chip-1 { top: 10px; left: -60px; }
.hero-chip-2 { bottom: 60px; left: -80px; animation-delay: 1.2s; }
.hero-chip-3 { top: 50px; right: -50px; animation-delay: 0.5s; }
.hero-chip-4 { bottom: 30px; right: -40px; animation-delay: 2s; }

/* ═══════════════════════════════════════════════════
   ABOUT
   ═══════════════════════════════════════════════════ */
#about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 64px;
  align-items: start;
}

.about-photo-wrap {
  position: relative;
}
.about-photo {
  width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--radius-xl);
  object-fit: cover;
  object-position: center top;
  box-shadow: var(--shadow-lg);
}
.about-photo-badge {
  position: absolute;
  bottom: -16px;
  right: -16px;
  background: var(--grad-main);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  box-shadow: var(--shadow-md);
}
.about-photo-badge-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}
.about-photo-badge-sub {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.8);
  font-weight: 500;
}

.about-text h2 { margin-bottom: 16px; }
.about-text > p { margin-bottom: 28px; line-height: 1.8; }

.about-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}
.about-info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.about-info-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.about-info-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ── Interests header above hobbies ── */
.about-interests-header {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
  margin-top: 4px;
}

.about-hobbies {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

/* Monochrome technical hobby badge */
.hobby-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.hobby-badge svg {
  flex-shrink: 0;
  opacity: 0.7;
}
.hobby-badge:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
  background: rgba(99,102,241,0.06);
}

.about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ═══════════════════════════════════════════════════
   SKILLS
   ═══════════════════════════════════════════════════ */
#skills {
  background: var(--bg-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.skill-category {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-base);
}
.skill-category:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}

.skill-category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.skill-category-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.skill-category-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.skill-category-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: default;
}
.skill-tag:hover {
  background: rgba(99,102,241,0.1);
  border-color: var(--border-bright);
  color: var(--text-primary);
  transform: translateY(-1px);
}
.skill-tag.highlight {
  background: rgba(99,102,241,0.12);
  border-color: rgba(99,102,241,0.35);
  color: #a5b4fc;
}
.skill-tag.highlight-cyan {
  background: rgba(6,182,212,0.10);
  border-color: rgba(6,182,212,0.30);
  color: #67e8f9;
}
.skill-tag.highlight-green {
  background: rgba(16,185,129,0.10);
  border-color: rgba(16,185,129,0.30);
  color: #6ee7b7;
}

/* ═══════════════════════════════════════════════════
   PROJECTS
   ═══════════════════════════════════════════════════ */
#projects {
  background: var(--bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.4), 0 0 0 1px rgba(99,102,241,0.15);
}
.project-card.featured {
  grid-column: span 2;
  flex-direction: row;
  min-height: 280px;
}

.project-img-wrap {
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.project-card:not(.featured) .project-img-wrap {
  height: 220px;
}
.project-card.featured .project-img-wrap {
  width: 45%;
}
.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.project-card:hover .project-img {
  transform: scale(1.05);
}
.project-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(10,13,20,0.85));
}
.project-card.featured .project-img-overlay {
  background: linear-gradient(to right, transparent 50%, rgba(13,18,33,0.9));
}

.project-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}
.project-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.project-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}

/* ── Technical Specs Grid (replaces emoji metrics) ── */
.tech-specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px 12px;
  margin-bottom: 16px;
  padding: 14px 16px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  border-left: 2px solid var(--accent-primary);
}
[data-theme='light'] .tech-specs-grid {
  background: rgba(99,102,241,0.04);
}
.tech-spec {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.tech-spec-key {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.tech-spec-val {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-secondary);
}

.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 10px;
}

/* ── NDA Badge ── */
.nda-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-amber);
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.22);
  border-radius: var(--radius-full);
  padding: 4px 12px;
}
.nda-badge svg {
  flex-shrink: 0;
}
.project-links {
  display: flex;
  gap: 8px;
}

/* Video badge */
.video-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,0,0,0.82);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.9);
}

/* ═══════════════════════════════════════════════════
   EXPERIENCE (TIMELINE)
   ═══════════════════════════════════════════════════ */
#experience {
  background: var(--bg-primary);
}

.timeline {
  position: relative;
  padding-left: 40px;
  max-width: 860px;
  margin: 0 auto;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  opacity: 0.3;
  border-radius: 2px;
}

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

.timeline-dot {
  position: absolute;
  left: -31px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--grad-main);
  box-shadow: 0 0 0 3px var(--bg-primary), 0 0 0 5px rgba(99,102,241,0.3);
  z-index: 1;
}
.timeline-item.current .timeline-dot {
  animation: pulseGlow 2s ease-in-out infinite;
}

.timeline-card {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  transition: all var(--transition-base);
}
.timeline-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-card);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.timeline-company {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-secondary);
  margin-bottom: 4px;
}
.timeline-role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}
.timeline-period {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-shrink: 0;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 4px 10px;
  white-space: nowrap;
}

.timeline-location {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.timeline-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.timeline-bullets li {
  display: flex;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  align-items: flex-start;
}
.timeline-bullets li::before {
  content: '▸';
  color: var(--accent-primary);
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 2px;
  line-height: 1.65;
}
.timeline-bullets li > span {
  display: block;
  flex: 1;
  min-width: 0;
}
.timeline-bullets li strong {
  display: inline !important;
  width: auto !important;
  color: var(--text-primary);
  font-weight: 650;
}

.timeline-type-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  flex-wrap: wrap;
}

/* Education card */
.education-card {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  max-width: 860px;
  margin: 0 auto 24px;
  transition: all var(--transition-base);
}
.education-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-card);
}
.edu-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.edu-body { flex: 1; }
.edu-institution {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-secondary);
  margin-bottom: 4px;
}
.edu-degree {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.edu-details {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
}
.edu-detail {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.edu-gpa {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.25);
  border-radius: var(--radius-full);
  padding: 3px 10px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-amber);
}

/* ═══════════════════════════════════════════════════
   REFERENCES & CERTIFICATES
   ═══════════════════════════════════════════════════ */
#references {
  background: var(--bg-secondary);
}

.references-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.ref-card {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.ref-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.ref-quote {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.75;
  font-style: italic;
  flex: 1;
  position: relative;
  padding-left: 14px;
}
.ref-quote::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--grad-main);
  border-radius: 2px;
}

.ref-person {
  display: flex;
  align-items: center;
  gap: 12px;
}
.ref-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.ref-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.ref-title {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Certificates gallery */
.certs-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.cert-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-base);
  aspect-ratio: 3/4;
}
.cert-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.cert-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.cert-card:hover img {
  transform: scale(1.05);
}

/* Top status badges on certificate cards */
.cert-badge-top {
  position: absolute;
  top: 12px;
  left: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: rgba(7, 11, 20, 0.86);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  z-index: 5;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
  pointer-events: none;
}
.cert-badge-academic {
  border-color: rgba(16, 185, 129, 0.4);
  color: #10b981;
}
.cert-badge-restricted {
  border-color: rgba(245, 158, 11, 0.4);
  color: #f59e0b;
}
.cert-badge-linkedin {
  border-color: rgba(10, 102, 194, 0.5);
  color: #38bdf8;
}
.cert-badge-portfolio {
  border-color: rgba(245, 158, 11, 0.45);
  color: #fbbf24;
}

/* Centered portfolio card under certificates */
.portfolio-centered-wrap {
  display: flex;
  justify-content: center;
  margin-top: 24px;
  width: 100%;
}
.portfolio-centered-wrap .cert-card {
  width: 100%;
  max-width: calc((100% - 40px) / 3);
  min-width: 280px;
}
@media (max-width: 900px) {
  .portfolio-centered-wrap .cert-card {
    max-width: calc((100% - 20px) / 2);
  }
}
@media (max-width: 600px) {
  .portfolio-centered-wrap .cert-card {
    max-width: 100%;
  }
}
.cert-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7,11,20,0.92) 0%, transparent 55%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px;
  z-index: 4;
}
.cert-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}
.cert-sub {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.60);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}
.cert-zoom-icon {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 30px;
  height: 30px;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 5;
}
.cert-card:hover .cert-zoom-icon { opacity: 1; }

/* ═══════════════════════════════════════════════════
   CONTACT
   ═══════════════════════════════════════════════════ */
#contact {
  background: var(--bg-primary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info h2 { margin-bottom: 12px; }
.contact-info > p { margin-bottom: 32px; }

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  text-decoration: none;
  transition: all var(--transition-base);
}
.contact-item:hover {
  border-color: var(--border-medium);
  background: rgba(99,102,241,0.07);
  transform: translateX(4px);
}
.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
}
.contact-item-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-item-value {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}
.contact-copy-btn {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-copy-btn:hover { color: var(--accent-primary); }

/* Download CV section */
.cv-download-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}
.cv-download-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.cv-download-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Contact form */
.contact-form {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
}
.form-group {
  margin-bottom: 20px;
}
.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.form-input,
.form-textarea {
  width: 100%;
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  outline: none;
  -webkit-appearance: none;
}
.form-input:focus,
.form-textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
  background: rgba(99,102,241,0.04);
}
.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}
.form-textarea {
  resize: vertical;
  min-height: 130px;
}
.form-submit {
  width: 100%;
  justify-content: center;
  font-size: 0.95rem;
  padding: 14px;
}

/* ═══════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════ */
#footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-socials {
  display: flex;
  gap: 8px;
}
.footer-social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}
.footer-social-link:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: rgba(99,102,241,0.1);
}

/* ═══════════════════════════════════════════════════
   MODAL / LIGHTBOX
   ═══════════════════════════════════════════════════ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(7,11,20,0.92);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.modal-content {
  position: relative;
  max-width: 900px;
  max-height: 90vh;
  overflow: auto;
  border-radius: var(--radius-xl);
  animation: modalIn 0.3s ease;
}
.modal-content img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-xl);
  display: block;
}
.modal-close {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.modal-close:hover {
  background: rgba(244,63,94,0.3);
  border-color: var(--accent-rose);
}

/* Video modal */
.video-modal-inner {
  background: #000;
  border-radius: var(--radius-xl);
  overflow: hidden;
  max-width: 900px;
  width: 100%;
}
.video-modal-inner video {
  width: 100%;
  display: block;
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 32px;
  right: 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  z-index: 3000;
  display: flex;
  align-items: center;
  gap: 8px;
  transform: translateY(80px);
  opacity: 0;
  transition: all var(--transition-base);
}
.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ═══════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .skills-grid,
  .projects-grid,
  .references-grid { grid-template-columns: repeat(2, 1fr); }
  .project-card.featured { grid-column: span 2; }
  .certs-row { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }

  .hero-inner {
    grid-template-columns: 1fr;
    padding: 40px 0 60px;
    gap: 40px;
  }
  .hero-visual { order: -1; }
  .profile-ring { width: 240px; height: 240px; }
  .hero-chip-1, .hero-chip-2 { left: -20px; }
  .hero-chip-3, .hero-chip-4 { right: -10px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-photo-wrap { max-width: 300px; margin: 0 auto; }

  .skills-grid,
  .projects-grid,
  .references-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-column: span 1; flex-direction: column; }
  .project-card.featured .project-img-wrap { width: 100%; height: 220px; }

  .contact-grid { grid-template-columns: 1fr; }

  .certs-row { grid-template-columns: 1fr; }

  .timeline { padding-left: 24px; }
  .timeline::before { left: 8px; }
  .timeline-dot { left: -24px; }

  .footer-inner { flex-direction: column; text-align: center; }

  .nav-actions .btn { display: none; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .contact-form { padding: 24px; }
}

/* =====================================================
   DOCUMENT / PDF MODAL VIEWER
   ===================================================== */
.doc-modal-inner {
  background: #0d1221;
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-xl);
  overflow: hidden;
  max-width: 1050px;
  width: 95%;
  height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(99, 102, 241, 0.2);
  animation: modalIn 0.3s ease;
}
.doc-modal-header {
  height: 56px;
  padding: 0 20px;
  background: rgba(13, 18, 33, 0.95);
  border-bottom: 1px solid rgba(99, 102, 241, 0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
}
.doc-modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.doc-modal-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #f1f5f9;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.doc-modal-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.doc-download-btn {
  font-size: 0.78rem;
  padding: 6px 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 6px;
}
.doc-close-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition-fast);
}
.doc-close-btn:hover {
  background: rgba(244, 63, 94, 0.3);
  border-color: var(--accent-rose);
}
.doc-modal-body {
  flex: 1;
  width: 100%;
  background: #070b14;
  position: relative;
}
.doc-modal-frame {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  background: #111827;
}

/* =====================================================
   EXPERIENCE AR-GE SERGİ ALANI HIGHLIGHTS
   ===================================================== */
.exp-showcase-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}
.exp-showcase-card {
  background: var(--bg-glass-light);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}
.exp-showcase-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-main);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.exp-showcase-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-bright);
  box-shadow: var(--shadow-glow);
}
.exp-showcase-card:hover::before {
  opacity: 1;
}
.exp-showcase-metric {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 6px;
}
.exp-showcase-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.exp-showcase-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

@media (max-width: 900px) {
  .exp-showcase-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .teknofest-teams-grid {
    grid-template-columns: 1fr !important;
  }
}
@media (max-width: 480px) {
  .exp-showcase-bar {
    grid-template-columns: 1fr;
  }
}