:root {
  --navy-950: #0a1f33;
  --navy-800: #123a5c;
  --blue-700: #1a5f96;
  --blue-600: #2477b8;
  --blue-400: #5aa8d6;
  --sky-300: #8fd0e8;
  --sky-100: #e4f4fa;
  --paper: #f7fafc;
  --paper-alt: #eef3f7;
  --card: #ffffff;
  --ink: #10202c;
  --muted: #4d6172;
  --border: #dde6ec;
  --shadow: 0 10px 30px -12px rgba(10, 31, 51, 0.18);
  --radius: 14px;
  --max-width: 1080px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: inherit;
  font-weight: 700;
  color: var(--navy-950);
  margin: 0 0 0.5em;
}

h2 { font-size: clamp(1.7rem, 2.6vw, 2.2rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; color: var(--muted); }

a { color: var(--blue-700); }

ul { color: var(--muted); padding-left: 1.2em; }
ul li { margin-bottom: 0.4em; }

section[id] { scroll-margin-top: 76px; }

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

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

.section-lede {
  max-width: 640px;
  font-size: 1.05rem;
}

/* Nav toggle checkbox hack (no JS) */
.nav-toggle { display: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 250, 252, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--navy-950);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 1.35rem;
}

.site-nav a {
  color: var(--navy-800);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.88rem;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.site-nav a:hover { color: var(--blue-600); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--navy-950);
  border-radius: 2px;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--navy-950) 0%, var(--blue-700) 100%);
  text-align: center;
  padding: 3.25rem 1.5rem 3.75rem;
}

.hero-waves {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-waves svg {
  width: 100%;
  height: 100%;
  display: block;
}

.wave-1 { fill: var(--blue-600); opacity: 0.55; }
.wave-2 { fill: var(--blue-400); opacity: 0.45; }
.wave-3 { fill: var(--sky-300); opacity: 0.35; }

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}

.headshot {
  width: 220px;
  height: 220px;
  border-radius: 28px;
  object-fit: cover;
  object-position: center top;
  border: 4px solid #ffffff;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.hero h1 {
  color: #ffffff;
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 0.4em;
}

.tagline {
  color: var(--sky-100);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 1.2em;
}

.hero-summary {
  color: #d9e9f4;
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.6rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-primary {
  background: #ffffff;
  color: var(--navy-950);
}

.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.18); }

.btn-ghost {
  background: transparent;
  color: #ffffff;
  border: 1.5px solid rgba(255,255,255,0.6);
}

.btn-ghost:hover { background: rgba(255,255,255,0.12); }

/* About */
#about p {
  max-width: 720px;
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  border-left: 2px solid var(--border);
  padding-left: 1.75rem;
  margin-bottom: 2rem;
}

.timeline-item { position: relative; }

.timeline-marker {
  position: absolute;
  left: -2.28rem;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue-600);
  border: 3px solid var(--sky-100);
}

.timeline-content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow);
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.timeline-head h3 { margin: 0; }

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-700);
  white-space: nowrap;
}

.timeline-org {
  font-weight: 600;
  color: var(--navy-800);
  margin: 0.2em 0 0.8em;
}

.subsection-title {
  margin-bottom: 1.25rem;
}

.tech-projects-title {
  margin-top: 2rem;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.highlight-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.highlight-date {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue-700);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5em;
}

.highlight-card h4 {
  font-size: 1.02rem;
  margin: 0 0 0.2em;
  color: var(--navy-950);
}

/* Projects */
.project-grid {
  display: grid;
  gap: 1rem;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.project-card > summary {
  cursor: pointer;
  padding: 1.25rem 1.75rem;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  position: relative;
}

.project-card > summary::-webkit-details-marker { display: none; }

.project-card > summary::after {
  content: "+";
  position: absolute;
  right: 1.75rem;
  top: 1.1rem;
  font-size: 2.1rem;
  font-weight: 500;
  color: var(--blue-600);
  transition: transform 0.2s ease;
}

.project-card[open] > summary::after {
  content: "\2212";
}

.project-type {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blue-700);
  background: var(--sky-100);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.project-card h3 {
  margin: 0.2em 3rem 0 0;
  font-size: 1.1rem;
}

.project-meta {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.project-body {
  padding: 0 1.75rem 1.5rem;
  border-top: 1px solid var(--border);
  margin-top: 0.25rem;
  padding-top: 1rem;
}

.project-body p { color: var(--ink); }

/* Education */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.edu-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.edu-detail {
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  padding-top: 0.9em;
  margin-top: 0.9em;
}

/* Contact */
.contact-section {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--blue-700) 0%, var(--navy-950) 100%);
  text-align: center;
}

.contact-waves { position: absolute; inset: 0; z-index: 0; }
.contact-waves svg { width: 100%; height: 100%; display: block; }

.contact-inner {
  position: relative;
  z-index: 1;
}

.contact-section h2 { color: #ffffff; }
.contact-section p { color: var(--sky-100); }

.contact-actions {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.site-footer {
  text-align: center;
  padding: 1.75rem 1.5rem;
  background: var(--navy-950);
}

.site-footer p {
  color: #93a9ba;
  margin: 0;
  font-size: 0.85rem;
}

/* Buttons - small variant */
.btn-sm {
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
}

/* Badge chip */
.badge-chip {
  display: inline-block;
  background: var(--sky-100);
  color: var(--navy-800);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

/* Project four-question grid */
.pf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 0 0 1rem;
}

.pf-grid dt {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blue-700);
  margin-bottom: 0.35em;
}

.pf-grid dd {
  margin: 0;
  color: var(--ink);
  font-size: 0.92rem;
}

/* Nested doc/slide toggle inside a project card */
.doc-toggle {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.doc-toggle > summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--blue-700);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.doc-toggle > summary::-webkit-details-marker { display: none; }

.doc-toggle > summary::after {
  content: "+";
  font-size: 1.9rem;
  font-weight: 500;
  color: var(--blue-600);
  line-height: 1;
  flex-shrink: 0;
}

.doc-toggle[open] > summary::after {
  content: "\2212";
}

/* Original document embeds */
.office-embed {
  margin-top: 1rem;
}

.office-iframe {
  width: 100%;
  height: 520px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--paper-alt);
}

.embed-fallback {
  padding: 1.25rem 1.5rem;
  background: var(--paper-alt);
  border: 1px dashed var(--border);
  border-radius: 10px;
  font-size: 0.88rem;
}

.embed-fallback p { margin: 0; color: var(--muted); }

.embed-fallback-link {
  font-size: 0.82rem;
  margin: 0.6rem 0 0;
}

/* Skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 4px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.skill-tile {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  background: var(--sky-100);
}

.skill-tile.skill-tile-alt { background: var(--sky-300); }

.skill-name {
  font-weight: 700;
  color: var(--navy-950);
  font-size: 0.95rem;
}

.skill-evidence {
  font-size: 0.85rem;
  color: var(--blue-700);
  font-weight: 600;
}

a.skill-evidence:hover { color: var(--navy-950); }
span.skill-evidence { color: var(--muted); font-weight: 500; }

/* Data viz */
.dataviz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 1.5rem;
}

.dataviz-grid-single {
  grid-template-columns: 1fr;
}

.dataviz-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  min-width: 0;
  overflow: hidden;
}

.dataviz-card h3 { font-size: 1.05rem; }

.dataviz-series-title {
  margin: 2.5rem 0 0.5rem;
  font-size: 1.3rem;
}

.viz-embed {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--paper-alt);
  overflow: hidden;
}

.viz-embed iframe {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  display: block;
  border: 0;
}

/* Fixed-size Tableau vizzes don't reflow like a PDF does, so we render
   at native pixel size and scale the whole iframe down to fit instead
   of letting it clip with an internal scrollbar. */
.tableau-embed {
  position: relative;
}

.tableau-embed iframe {
  aspect-ratio: auto;
  transform-origin: top left;
  position: relative;
  z-index: 1;
}

.viz-loading {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.viz-loading a { color: var(--blue-700); font-weight: 600; }

.dataviz-source {
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 0.75em;
  margin: 1rem 0 0;
}

/* Learning timeline */
.timeline-placeholder {
  background: transparent;
  border: 1px dashed var(--border);
  box-shadow: none;
  text-align: center;
}

.timeline-placeholder p {
  margin: 0;
  font-style: italic;
}

.timeline-next .timeline-marker {
  background: var(--card);
  border-color: var(--border);
}

/* Resumes */
.resume-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.resume-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

/* Responsive nav */
@media (max-width: 720px) {
  .hamburger { display: flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .site-nav a {
    padding: 0.9rem 1.5rem;
    border-top: 1px solid var(--border);
  }

  .nav-toggle:checked ~ .site-header .site-nav {
    max-height: 420px;
    overflow-y: auto;
  }

}