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

:root {
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --surface: #334155;
  --border: #475569;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-dim: rgba(56, 189, 248, 0.1);
  --white: #f8fafc;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--white);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover {
  color: var(--white);
  background: var(--accent-dim);
}

.nav-cta {
  background: var(--accent-dim);
  color: var(--accent) !important;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.nav-cta:hover {
  background: rgba(56, 189, 248, 0.15) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-greeting {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 8px;
  letter-spacing: -0.02em;
}

.hero-desc {
  max-width: 560px;
  color: var(--text-muted);
  margin-top: 24px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.925rem;
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent-dim);
  color: var(--accent-hover);
  transform: translateY(-1px);
}

.hero-links {
  display: flex;
  gap: 20px;
  margin-top: 48px;
}

.hero-links a {
  color: var(--text-dim);
  transition: color 0.2s, transform 0.2s;
}

.hero-links a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ===== Sections ===== */
.section {
  padding: 96px 0;
}

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

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.section-title::before {
  content: '';
  display: inline-block;
  width: 32px;
  height: 3px;
  background: var(--accent);
  margin-right: 16px;
  vertical-align: middle;
  border-radius: 2px;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-text strong {
  color: var(--accent);
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.highlight-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
}

.highlight-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--mono);
}

.highlight-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Experience ===== */
.timeline-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  border-radius: 3px 0 0 3px;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.timeline-company {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
}

.timeline-role {
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 500;
  margin-top: 2px;
}

.timeline-meta {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.timeline-location,
.timeline-date {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.timeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.timeline-list li {
  color: var(--text-muted);
  font-size: 0.925rem;
  padding-left: 20px;
  position: relative;
  line-height: 1.7;
}

.timeline-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.timeline-list li strong {
  color: var(--text);
}

/* ===== Projects ===== */
.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.project-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: border-color 0.3s, transform 0.2s;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.project-card-featured {
  grid-column: 1 / -1;
}

.project-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.project-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.925rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.project-features {
  margin-bottom: 20px;
}

.feature-group h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.feature-group ul {
  list-style: none;
  columns: 2;
  column-gap: 24px;
}

.feature-group li {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 3px 0 3px 18px;
  position: relative;
  break-inside: avoid;
}

.feature-group li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
}

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

.project-tags span {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 4px;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-category {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.skill-category h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

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

.skill-tags span {
  font-size: 0.85rem;
  color: var(--text);
  background: var(--surface);
  padding: 6px 14px;
  border-radius: 6px;
}

/* ===== Education ===== */
.education-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 40px;
}

.education-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.education-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
}

.education-degree {
  color: var(--accent);
  font-size: 0.95rem;
  margin-top: 2px;
}

.education-meta {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.education-note {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.subsection-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.cert-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.cert-provider {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.cert-card p {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
}

/* ===== Contact ===== */
.contact-container {
  text-align: center;
}

.contact-text {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 36px;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 700px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 22px;
  color: var(--text-muted);
  transition: border-color 0.2s, transform 0.2s;
}

.contact-card:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.contact-card span {
  font-size: 0.875rem;
  font-weight: 500;
}

.contact-card svg {
  flex-shrink: 0;
}

/* ===== Footer ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
  }

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

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

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

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

  .project-card-featured {
    grid-column: 1;
  }

  .feature-group ul {
    columns: 1;
  }

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

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

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

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

  .timeline-meta {
    text-align: left;
  }

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

  .btn {
    text-align: center;
    justify-content: center;
  }
}