/* ==========================================================================
   Design tokens
   ========================================================================== */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7f5;
  --color-ink: #17181c;
  --color-ink-soft: #4a4d57;
  --color-ink-faint: #86899092;
  --color-border: #e6e5e1;
  --color-accent: #2563a8;
  --color-accent-soft: #eaf1fa;
  --color-dark: #14151a;

  --tag-green-bg: #e8f5ee;   --tag-green-fg: #1f7a4d;
  --tag-blue-bg:  #eaf1fa;   --tag-blue-fg:  #2563a8;
  --tag-orange-bg:#fdf0e4;   --tag-orange-fg:#b5651d;
  --tag-purple-bg:#f1eefb;   --tag-purple-fg:#6947c4;
  --tag-teal-bg:  #e6f6f5;   --tag-teal-fg:  #12796f;
  --tag-gray-bg:  #eeeeec;   --tag-gray-fg:  #55575e;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Fraunces', Georgia, serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --max-width: 1140px;

  --shadow-card: 0 1px 2px rgba(20,21,26,0.04), 0 8px 24px -12px rgba(20,21,26,0.10);
  --shadow-card-hover: 0 4px 12px rgba(20,21,26,0.06), 0 16px 36px -14px rgba(20,21,26,0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0;
  color: var(--color-ink);
}

p { margin: 0 0 1em; color: var(--color-ink-soft); }
p:last-child { margin-bottom: 0; }

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

ul { margin: 0; padding: 0; list-style: none; }

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 0.75rem;
}

.section-inner, .header-inner, .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
}
.brand span { color: var(--color-accent); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-ink-soft);
  transition: color 0.15s ease;
}
.main-nav a:hover { color: var(--color-ink); }

.nav-cta {
  padding: 8px 16px;
  border: 1px solid var(--color-ink);
  border-radius: 100px;
  color: var(--color-ink) !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--color-ink); color: #fff !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: 80px 0 0;
  background: var(--color-bg);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(2.6rem, 5vw, 3.8rem);
  margin: 0.2em 0 0.4em;
}

.hero-lede {
  font-size: 1.15rem;
  max-width: 46ch;
  color: var(--color-ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--color-ink);
  color: #fff;
}
.btn-primary:hover { background: var(--color-dark); }

.btn-outline {
  border-color: var(--color-ink);
  color: var(--color-ink);
}
.btn-outline:hover { background: var(--color-ink); color: #fff; }

.btn-ghost {
  color: var(--color-ink-soft);
}
.btn-ghost:hover { color: var(--color-ink); }

.hero-media {
  display: flex;
  justify-content: center;
}

.hero-photo {
  width: 100%;
  max-width: 340px;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.hero-stats {
  max-width: var(--max-width);
  margin: 64px auto 0;
  padding: 32px 24px;
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-accent);
}
.stat-label {
  font-size: 0.85rem;
  color: var(--color-ink-faint);
  line-height: 1.4;
}

/* ==========================================================================
   Sections (generic)
   ========================================================================== */
.section { padding: 88px 0; }
.section-alt { background: var(--color-bg-alt); }

.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.4rem);
}
.section-sub {
  margin-top: 0.75rem;
  font-size: 1.02rem;
}

/* About */
.about-grid { display: block; }
.about-body p { font-size: 1.02rem; max-width: 74ch; }

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 1.5rem;
}

.tag {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 100px;
}
.tag-sql, .tag-py { background: var(--tag-green-bg); color: var(--tag-green-fg); }
.tag-bi { background: var(--tag-orange-bg); color: var(--tag-orange-fg); }
.tag-cloud { background: var(--tag-blue-bg); color: var(--tag-blue-fg); }
.tag-misc { background: var(--tag-purple-bg); color: var(--tag-purple-fg); }

/* ==========================================================================
   Experience timeline
   ========================================================================== */
.timeline {
  position: relative;
  padding-left: 32px;
  border-left: 2px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.timeline-item { position: relative; }

.timeline-marker {
  position: absolute;
  left: -39px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg-alt);
}

.timeline-date {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.4rem;
}

.timeline-content h3 { font-size: 1.4rem; margin-bottom: 0.2rem; }
.timeline-org { font-size: 0.95rem; color: var(--color-ink-faint); margin-bottom: 1rem; }

.timeline-content ul { display: flex; flex-direction: column; gap: 10px; }
.timeline-content li {
  position: relative;
  padding-left: 20px;
  font-size: 0.96rem;
  color: var(--color-ink-soft);
}
.timeline-content li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* ==========================================================================
   Projects
   ========================================================================== */
.project-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.project-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.project-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.project-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.tag-pill {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 5px 12px;
  border-radius: 100px;
}
.tag-pill-green  { background: var(--tag-green-bg);  color: var(--tag-green-fg); }
.tag-pill-blue   { background: var(--tag-blue-bg);   color: var(--tag-blue-fg); }
.tag-pill-orange { background: var(--tag-orange-bg); color: var(--tag-orange-fg); }
.tag-pill-purple { background: var(--tag-purple-bg); color: var(--tag-purple-fg); }
.tag-pill-teal   { background: var(--tag-teal-bg);   color: var(--tag-teal-fg); }
.tag-pill-gray   { background: var(--tag-gray-bg);   color: var(--tag-gray-fg); }

.project-card h3 { font-size: 1.35rem; margin-bottom: 10px; }
.project-desc { font-size: 0.98rem; max-width: 76ch; }

.project-techlabel {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin: 20px 0 10px;
}

.project-tech-list { display: flex; flex-direction: column; gap: 8px; }
.project-tech-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
}
.project-tech-list li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.key-finding {
  margin-top: 22px;
  background: var(--color-dark);
  border-radius: var(--radius-md);
  padding: 20px 22px;
}
.kf-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #e2a25a;
  margin-bottom: 8px;
}
.key-finding p:last-child {
  color: #e8e9ee;
  font-size: 0.94rem;
  line-height: 1.55;
}

/* ==========================================================================
   Personal section
   ========================================================================== */
.personal-grid { display: block; }
.personal-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 28px;
  align-items: start;
}

.personal-card { margin: 0; }

.personal-photo-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: #fff;
  border: 1px solid var(--color-border);
}
.personal-photo {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}
.photo-caption {
  padding: 14px 18px;
  font-size: 0.85rem;
  color: var(--color-ink-faint);
  margin: 0;
}

/* ==========================================================================
   Skills
   ========================================================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}

.skill-group {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.skill-cat {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}

.skill-group li {
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  padding: 6px 0;
  border-top: 1px solid var(--color-border);
}
.skill-group li:first-child { border-top: none; padding-top: 0; }

.education-block { border-top: 1px solid var(--color-border); padding-top: 40px; }
.education-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.edu-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.edu-card h4 {
  font-size: 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  margin-bottom: 6px;
}
.edu-org { font-size: 0.86rem; color: var(--color-ink-faint); }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-section {
  background: var(--color-dark);
  color: #fff;
  text-align: left;
}
.contact-section .eyebrow { color: #7db4e8; }
.contact-section h2 { color: #fff; font-size: clamp(2rem, 4vw, 2.8rem); }
.contact-sub { color: #b7bac2; margin-top: 1rem; font-size: 1.05rem; max-width: 56ch; }

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 2rem;
}

.contact-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border: 1px solid #35373f;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 500;
  color: #e8e9ee;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.contact-pill:hover { border-color: #5b93c9; background: #1c1e26; }
.contact-icon { color: #5b93c9; font-weight: 700; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-dark);
  border-top: 1px solid #26282f;
  padding: 24px 0 32px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-inner p {
  margin: 0;
  font-size: 0.85rem;
  color: #7d808a;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; text-align: left; }
  .hero-media { order: -1; max-width: 220px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .personal-content { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .education-cards { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .main-nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px 28px;
    gap: 18px;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.2s ease, opacity 0.2s ease;
    pointer-events: none;
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-toggle { display: flex; }
  .nav-cta { margin-top: 4px; }

  .hero-stats { grid-template-columns: 1fr 1fr; padding: 24px; }
  .section { padding: 64px 0; }
  .skills-grid { grid-template-columns: 1fr; }
  .project-card { padding: 24px; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
}