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

:root {
  --bg:        #ffffff;
  --bg-alt:    #f8fafc;
  --text:      #0f172a;
  --text-2:    #64748b;
  --accent:    #2563eb;
  --accent-h:  #1d4ed8;
  --border:    #e2e8f0;
  --tag-bg:    #f1f5f9;
  --tag-text:  #475569;
  --radius:    8px;
  --nav-h:     64px;
  --max-w:     960px;
  --font:      'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-h); }

ul { list-style: none; }

/* ─── Nav ───────────────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color 0.3s var(--ease);
}

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

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  letter-spacing: 0.05em;
}
.nav-logo:hover { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-links .nav-cta {
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 16px;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s;
}
.nav-links .nav-cta:hover {
  background: var(--accent);
  color: #fff;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

/* ─── Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}
.btn-primary:hover {
  background: var(--accent-h);
  border-color: var(--accent-h);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--text);
  color: var(--text);
  transform: translateY(-1px);
}

.btn-lg { padding: 14px 32px; font-size: 1rem; }

/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-h) + 40px) 24px 80px;
  text-align: center;
}

.hero-inner { max-width: 680px; }

.hero-greeting {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.hero-name {
  font-size: clamp(2.8rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--text);
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-2);
  max-width: 480px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: var(--text-2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.6;
  animation: fadeInUp 1s ease 1s both;
}

.scroll-dot { animation: scrollDot 2s ease-in-out infinite; }
@keyframes scrollDot {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50%       { transform: translateY(6px); opacity: 0.3; }
}

/* ─── Sections ──────────────────────────────────────────── */
.section { padding: 96px 24px; }
.section-alt { background: var(--bg-alt); }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
}

.container-narrow { max-width: 560px; }
.center { text-align: center; }

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 40px;
}

/* ─── About ─────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--text-2);
  margin-bottom: 16px;
  font-size: 1.02rem;
}
.about-text p:last-of-type { margin-bottom: 24px; }
.about-text strong { color: var(--text); font-weight: 600; }

.about-links {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  flex-wrap: wrap;
}
.dot { color: var(--border); }

.skills-block h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
}

.skills-group { margin-bottom: 20px; }

.skills-category {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 8px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ─── Timeline ──────────────────────────────────────────── */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid var(--border);
  margin-left: 16px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
  padding: 0 0 48px 40px;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -9px;
  top: 6px;
  width: 16px; height: 16px;
  background: var(--bg-alt);
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.timeline-meta { padding-top: 4px; }

.timeline-date {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-2);
  white-space: nowrap;
}

.timeline-role {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}

.timeline-company {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline-body ul {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-body li {
  font-size: 0.92rem;
  color: var(--text-2);
  padding-left: 16px;
  position: relative;
}

.timeline-body li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--border);
}

/* ─── Projects ──────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.08);
  border-color: #cbd5e1;
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.project-icon {
  width: 42px; height: 42px;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}
.project-icon svg { width: 20px; height: 20px; }

.project-link {
  color: var(--text-2);
  transition: color 0.2s;
  padding: 4px;
}
.project-link:hover { color: var(--accent); }
.project-link svg { width: 18px; height: 18px; display: block; }

.project-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.65;
  flex: 1;
}

/* ─── Contact ───────────────────────────────────────────── */
.contact-intro {
  font-size: 1.05rem;
  color: var(--text-2);
  margin-bottom: 32px;
  line-height: 1.7;
}

/* ─── Footer ────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-2);
}

.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a { color: var(--text-2); }
.footer-links a:hover { color: var(--text); }

/* ─── Animations ────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px 28px;
    gap: 20px;
  }
  .hamburger { display: flex; }

  .about-grid { grid-template-columns: 1fr; gap: 40px; }

  .timeline { margin-left: 0; }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding-left: 28px;
  }
  .timeline-item::before { left: -9px; }

  .hero-scroll-hint { display: none; }
}

@media (max-width: 480px) {
  .section { padding: 72px 20px; }
  .projects-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}