/* ==============================================
   CSS Custom Properties
   ============================================== */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #0d1220;
  --bg-card: #111827;
  --bg-card-hover: #1a2435;
  --border: #1f2937;
  --border-accent: rgba(79, 142, 247, 0.4);
  --accent: #4f8ef7;
  --accent-light: #7aa8fa;
  --accent-glow: rgba(79, 142, 247, 0.12);
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --success: #10b981;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --nav-height: 68px;
  --section-padding: 100px 0;
  --radius: 12px;
  --transition: 0.28s ease;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-accent: 0 8px 40px rgba(79, 142, 247, 0.18);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

/* ==============================================
   Utilities
   ============================================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.accent {
  color: var(--accent);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 56px;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: var(--accent);
  margin: 14px auto 0;
  border-radius: 2px;
}

/* ==============================================
   Scroll Reveal
   ============================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

/* ==============================================
   Buttons
   ============================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(79, 142, 247, 0.35);
}

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

.btn-outline:hover {
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(79, 142, 247, 0.18);
}

/* ==============================================
   Navigation
   ============================================== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

#navbar.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  transition: color var(--transition);
}

.nav-logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: rgba(79, 142, 247, 0.1);
}

.nav-link.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 7px 18px;
}

.nav-link.nav-cta:hover {
  background: var(--accent-light);
  box-shadow: 0 4px 16px rgba(79, 142, 247, 0.3);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 1001;
}

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

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==============================================
   Hero
   ============================================== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-height) + 24px) 24px 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(79, 142, 247, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 65%, rgba(79, 142, 247, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(79, 142, 247, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 142, 247, 0.03) 1px, transparent 1px);
  background-size: 56px 56px;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 820px;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-name {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  margin-bottom: 18px;
  min-height: 2.2em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero-location {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 40px;
}

.hero-location i {
  color: var(--accent);
  margin-right: 5px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-scroll {
  position: absolute;
  bottom: -48px;
  left: 50%;
  transform: translateX(-50%);
}

.hero-scroll a {
  color: var(--text-muted);
  font-size: 1.1rem;
  display: block;
  animation: bounce 2.2s ease-in-out infinite;
  transition: color var(--transition);
}

.hero-scroll a:hover {
  color: var(--accent);
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(9px); }
}

/* ==============================================
   About
   ============================================== */
#about {
  padding: var(--section-padding);
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 290px;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.02rem;
}

.about-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.about-text .btn {
  margin-top: 8px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
}

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

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==============================================
   Experience / Timeline
   ============================================== */
#experience {
  padding: var(--section-padding);
}

.timeline {
  position: relative;
  padding-left: 44px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent) 0%, rgba(79, 142, 247, 0.1) 100%);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -39px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent);
  transition: transform var(--transition);
}

.timeline-item:hover .timeline-dot {
  transform: scale(1.3);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}

.timeline-card:hover {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-accent);
  transform: translateX(5px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.timeline-role {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 5px;
}

.timeline-company {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
}

.timeline-company i {
  margin-right: 6px;
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  flex-shrink: 0;
}

.timeline-date,
.timeline-location {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.timeline-date i,
.timeline-location i {
  margin-right: 4px;
}

.timeline-badge {
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timeline-badge.current {
  background: rgba(16, 185, 129, 0.12);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.timeline-bullets {
  padding: 0;
  margin-bottom: 4px;
}

.timeline-bullets li {
  position: relative;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.93rem;
  margin-bottom: 8px;
  line-height: 1.65;
}

.timeline-bullets li:last-child {
  margin-bottom: 0;
}

.timeline-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.85rem;
  top: 1px;
}

.timeline-bullets strong {
  color: var(--text-primary);
  font-weight: 600;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 16px;
}

.tag {
  background: rgba(79, 142, 247, 0.08);
  color: var(--accent);
  border: 1px solid rgba(79, 142, 247, 0.2);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.76rem;
  font-family: var(--font-mono);
  transition: all var(--transition);
}

.tag:hover {
  background: rgba(79, 142, 247, 0.18);
  border-color: var(--border-accent);
}

/* ==============================================
   Skills
   ============================================== */
#skills {
  padding: var(--section-padding);
  background: var(--bg-secondary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}

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

.skill-category-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-category-title i {
  color: var(--accent);
  font-size: 1rem;
  width: 18px;
}

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

.skill-tag {
  background: rgba(79, 142, 247, 0.06);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  transition: all var(--transition);
  cursor: default;
}

.skill-tag:hover {
  background: rgba(79, 142, 247, 0.15);
  color: var(--text-primary);
  border-color: rgba(79, 142, 247, 0.35);
}

/* ==============================================
   Certifications
   ============================================== */
#certifications {
  padding: var(--section-padding);
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: all var(--transition);
}

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

.cert-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(79, 142, 247, 0.1);
  border: 1px solid rgba(79, 142, 247, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--accent);
  flex-shrink: 0;
  transition: all var(--transition);
}

.cert-card:hover .cert-icon {
  background: rgba(79, 142, 247, 0.18);
  transform: scale(1.05);
}

.cert-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 5px;
  line-height: 1.4;
}

.cert-issuer {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==============================================
   Education
   ============================================== */
#education {
  padding: var(--section-padding);
  background: var(--bg-secondary);
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 22px;
  max-width: 800px;
  margin: 0 auto;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  align-items: flex-start;
  gap: 22px;
  transition: all var(--transition);
}

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

.edu-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(79, 142, 247, 0.1);
  border: 1px solid rgba(79, 142, 247, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent);
  flex-shrink: 0;
}

.edu-degree {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.edu-school {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.edu-year {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.edu-year i {
  margin-right: 4px;
}

/* ==============================================
   Contact
   ============================================== */
#contact {
  padding: var(--section-padding);
  text-align: center;
}

.contact-subtitle {
  color: var(--text-secondary);
  font-size: 1.02rem;
  max-width: 520px;
  margin: -30px auto 48px;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 0.97rem;
  width: 100%;
  max-width: 480px;
  transition: all var(--transition);
}

.contact-link i {
  font-size: 1.25rem;
  color: var(--accent);
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.contact-link:hover {
  border-color: var(--border-accent);
  color: var(--text-primary);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-accent);
  transform: translateX(6px);
}

/* ==============================================
   Footer
   ============================================== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align: center;
}

footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ==============================================
   Responsive — Tablet
   ============================================== */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ==============================================
   Responsive — Mobile
   ============================================== */
@media (max-width: 768px) {
  :root {
    --section-padding: 72px 0;
  }

  /* Mobile nav */
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 20px;
    border-bottom: 1px solid var(--border);
    gap: 2px;
  }

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

  .nav-link {
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  .nav-link.nav-cta {
    margin-top: 8px;
    text-align: center;
  }

  .nav-toggle {
    display: flex;
  }

  /* About stats: 2-col grid on mobile */
  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Timeline */
  .timeline {
    padding-left: 28px;
  }

  .timeline::before {
    left: 5px;
  }

  .timeline-dot {
    left: -24px;
  }

  .timeline-header {
    flex-direction: column;
  }

  .timeline-meta {
    align-items: flex-start;
  }

  .timeline-card {
    padding: 22px 18px;
  }

  /* Hero */
  .hero-name {
    font-size: 2rem;
  }

  .hero-cta {
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .timeline-card {
    padding: 18px 14px;
  }

  .contact-link {
    padding: 15px 20px;
    font-size: 0.88rem;
  }

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

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

/* ==============================================
   Brand Slots
   ============================================== */

/* Base slot — shared by company avatars, cert icons, edu icons */
.brand-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.04em;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  flex-shrink: 0;
  /* background set dynamically by JS */
}

/* Img inside a slot */
.brand-slot .brand-icon {
  max-width: 80%;
  max-height: 80%;
  object-fit: contain;
  display: block;
}

/* ── Company avatars in the timeline ── */
.timeline-header-main {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.company-avatar {
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: 10px;
  font-size: 0.72rem;
  margin-top: 2px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ── Cert icons as brand slots ── */
.cert-icon.brand-slot {
  font-size: 0.78rem;
}

/* ── Edu icons as brand slots ── */
.edu-icon.brand-slot {
  font-size: 0.88rem;
}