/* ==========================================================================
   Jonathan Kleven — Portfolio
   "Big Sky" design system: sun-bleached paper, big-sky blue, copper, gold.
   Type: Zilla Slab (display) · Source Sans 3 (body) · IBM Plex Mono (utility)
   ========================================================================== */

:root {
  /* Palette */
  --sand:       #F7F0DF;   /* page background — sun-bleached paper */
  --sand-deep:  #EFE4CB;   /* alternate section background */
  --card:       #FFFBF1;   /* card surface */
  --ink:        #2A2118;   /* saddle-leather text */
  --ink-soft:   #5C5142;   /* secondary text */
  --line:       #D9CBAD;   /* hairline borders */
  --sky:        #2F7DBF;   /* big-sky blue */
  --sky-deep:   #1F5E94;
  --copper:     #C2562B;   /* copper / rust — primary accent */
  --copper-deep:#A1431F;
  --gold:       #E0A532;   /* wheat gold */
  --sage:       #6E7F5C;   /* sagebrush green */
  --night:      #1E2733;   /* footer navy */
  --night-soft: #2A3645;
  --term-green: #8FD18A;
  --term-gold:  #EBC368;
  --term-text:  #D9E2EC;

  /* Type */
  --display: "Zilla Slab", "Rockwell", "Roboto Slab", serif;
  --body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "Consolas", monospace;

  --radius: 12px;
  --shadow: 0 2px 6px rgba(42, 33, 24, 0.06), 0 10px 24px rgba(42, 33, 24, 0.07);
  --shadow-lift: 0 4px 10px rgba(42, 33, 24, 0.08), 0 18px 34px rgba(42, 33, 24, 0.12);
}

/* ---- Base ---------------------------------------------------------------- */

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--sand);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--display);
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--ink);
}

p { margin: 0 0 1em; }

a { color: var(--sky-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--copper); }

:focus-visible {
  outline: 3px solid var(--sky);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: var(--gold); color: var(--ink); }

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 88px 0 96px; }
.section.alt { background: var(--sand-deep); }

/* Eyebrow + section headers */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--copper);
  flex: none;
}

.section-title {
  font-size: 2.2rem;
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section-intro {
  max-width: 640px;
  color: var(--ink-soft);
  font-size: 1.06rem;
  margin-bottom: 44px;
}

/* ---- Buttons ------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 22px;
  border-radius: 8px;
  border: 2px solid var(--copper);
  background: var(--copper);
  color: #FFF8EC;
  font-family: var(--body);
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { background: var(--copper-deep); border-color: var(--copper-deep); color: #FFF8EC; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn.ghost:hover { background: var(--ink); color: var(--sand); }

.btn.small { padding: 8px 14px; font-size: 0.88rem; border-width: 1.5px; border-radius: 7px; }

.btn svg { width: 16px; height: 16px; flex: none; }

/* ---- Navigation ---------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 240, 223, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 66px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.18rem;
  color: var(--ink);
  text-decoration: none;
}
.brand:hover { color: var(--ink); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: block;
  padding: 8px 12px;
  border-radius: 7px;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.93rem;
  text-decoration: none;
}
.nav-links a:hover { color: var(--ink); background: rgba(42, 33, 24, 0.06); }
.nav-links a.active { color: var(--copper); }
.nav-links a.nav-cta {
  color: var(--sand);
  background: var(--ink);
  margin-left: 6px;
}
.nav-links a.nav-cta:hover { background: var(--copper); color: #FFF8EC; }

.nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--ink);
  border-radius: 7px;
  padding: 8px 10px;
  cursor: pointer;
  color: var(--ink);
}
.nav-toggle svg { width: 20px; height: 20px; }

/* ---- Hero ---------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 110px;
}

.hero-topo {
  position: absolute;
  top: -60px;
  right: -120px;
  width: 640px;
  opacity: 0.5;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sky-deep);
  margin-bottom: 22px;
}

/* "Howdy!" with the hat perched on the H */
.howdy {
  position: relative;
  display: inline-block;
  font-family: var(--display);
  font-weight: 700;
  font-size: 4.6rem;
  font-size: clamp(3.4rem, 7.5vw, 5.4rem);
  line-height: 1;
  letter-spacing: -0.01em;
}
.howdy-h { position: relative; display: inline-block; }
.howdy .hat {
  position: absolute;
  top: -0.53em;
  left: 44%;
  width: 1.45em;
  height: 1.15em;
  transform: translateX(-50%) rotate(-10deg);
  pointer-events: none;
  max-width: none;
}

.hero h1 {
  font-size: 2rem;
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  font-weight: 600;
  margin: 18px 0 14px;
}

.hero-sub {
  max-width: 540px;
  font-size: 1.12rem;
  color: var(--ink-soft);
  margin-bottom: 26px;
}

.cred-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sage);
  flex: none;
}
.chip.gold .dot { background: var(--gold); }

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* Hero emblem — network over the ridgeline */
.hero-art {
  display: flex;
  justify-content: center;
}
.hero-art svg {
  width: 100%;
  max-width: 430px;
  height: auto;
  filter: drop-shadow(0 14px 28px rgba(42, 33, 24, 0.12));
}

/* ---- Ridgeline dividers --------------------------------------------------- */

.ridge { display: block; width: 100%; height: 64px; margin-bottom: -1px; }
.ridge svg { width: 100%; height: 100%; }
.ridge.to-deep { color: var(--sand-deep); background: var(--sand); }
.ridge.to-sand { color: var(--sand); background: var(--sand-deep); }
.ridge.to-night { color: var(--night); background: var(--sand-deep); }

/* ---- About ---------------------------------------------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 56px;
  align-items: start;
}
.about-prose p { color: var(--ink-soft); }
.about-prose strong { color: var(--ink); }

/* Flight strip — aviation-style facts card */
.flight-strip {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 5px solid var(--sky);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 26px;
  font-family: var(--mono);
  font-size: 0.86rem;
}
.flight-strip h3 {
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sky-deep);
  margin-bottom: 16px;
}
.flight-strip dl { margin: 0; display: grid; gap: 10px; }
.flight-strip .row {
  display: grid;
  grid-template-columns: 9.5em 1fr;
  gap: 12px;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 9px;
}
.flight-strip .row:last-child { border-bottom: none; padding-bottom: 0; }
.flight-strip dt {
  color: var(--ink-soft);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding-top: 2px;
}
.flight-strip dd { margin: 0; font-weight: 600; }

/* ---- Certifications -------------------------------------------------------- */

.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.cert-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 30px 28px;
  position: relative;
  overflow: hidden;
}
.cert-card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--copper), var(--gold));
}
.cert-badge {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--copper);
  text-transform: uppercase;
  margin-bottom: 10px;
}
.cert-card h3 { font-size: 1.45rem; margin-bottom: 4px; }
.cert-meta {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.cert-card p { color: var(--ink-soft); margin: 0; font-size: 0.99rem; }

/* ---- Lab report library ----------------------------------------------------- */

.report-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.report-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 28px 24px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.report-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }

.report-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 14px; }
.tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 9px;
  border-radius: 5px;
  background: rgba(47, 125, 191, 0.12);
  color: var(--sky-deep);
}
.tag:nth-child(3n+2) { background: rgba(224, 165, 50, 0.18); color: #8A6210; }
.tag:nth-child(3n) { background: rgba(110, 127, 92, 0.16); color: #4C5A3E; }

.report-card h3 { font-size: 1.32rem; margin-bottom: 8px; }
.report-card .desc { color: var(--ink-soft); font-size: 0.98rem; flex: 1; margin-bottom: 18px; }
.report-meta {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
  margin-bottom: 18px;
}
.report-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.report-status {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 4px;
}

/* ---- Projects & experience --------------------------------------------------- */

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}
.project-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 30px;
  display: flex;
  flex-direction: column;
}
.project-card h3 { font-size: 1.3rem; margin: 6px 0 8px; }
.project-card p { color: var(--ink-soft); font-size: 0.98rem; flex: 1; margin-bottom: 18px; }

.subheading {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 28px;
}

/* Timeline */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  transform: translateX(-50%);
  background: var(--line);
}
.timeline li {
  position: relative;
  padding: 0 0 30px 38px;
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  /* dot center locked to the line center at x = 8px, regardless of box model */
  left: 8px;
  top: 7px;
  width: 16px;
  height: 16px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--sand);
  border: 3px solid var(--copper);
  box-sizing: border-box;
}
.timeline h4 {
  font-family: var(--display);
  font-size: 1.14rem;
  font-weight: 600;
  margin: 0 0 2px;
}
.timeline .when {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  display: block;
  margin-bottom: 6px;
}
.timeline p { color: var(--ink-soft); font-size: 0.97rem; margin: 0; max-width: 720px; }

/* ---- Coursework -------------------------------------------------------------- */

.course-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; align-items: start; }
.course-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.course-list li {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 4px;
  border-bottom: 1px dashed var(--line);
  font-size: 0.99rem;
}
.course-list li span:last-child {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--ink-soft);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  padding-top: 4px;
}

/* ---- Skills -------------------------------------------------------------------- */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.skill-group {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow);
}
.skill-group h3 {
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 16px;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tags span {
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--sand);
}

/* ---- Resume --------------------------------------------------------------------- */

.resume-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 5px solid var(--copper);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 34px;
}
.resume-panel h3 { font-size: 1.4rem; margin-bottom: 4px; }
.resume-panel p { color: var(--ink-soft); margin: 0; max-width: 520px; }
.resume-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---- Footer / contact ------------------------------------------------------------- */

.footer {
  background: var(--night);
  color: var(--term-text);
  padding: 76px 0 44px;
}
.footer .eyebrow { color: var(--gold); }
.footer .eyebrow::before { background: var(--gold); }
.footer h2 { color: #F4EEE0; font-size: 2.3rem; font-size: clamp(1.9rem, 3.5vw, 2.6rem); }
.footer .footer-lede { color: #AEBDCD; max-width: 560px; margin-bottom: 30px; }

.contact-row { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 56px; }
.footer .btn.ghost { color: #F4EEE0; border-color: #6B7B8E; }
.footer .btn.ghost:hover { background: #F4EEE0; color: var(--night); border-color: #F4EEE0; }

.footer-base {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 26px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: #8DA0B5;
}
.footer-base .sig { display: flex; align-items: center; gap: 10px; }
.footer-base .sig svg { width: 30px; height: auto; }
.footer-base a { color: #C9D6E3; }

/* ---- Reveal animation --------------------------------------------------------------- */

.anim .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.55s ease, transform 0.55s ease; }
.anim .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .anim .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .report-card { transition: none; }
}

/* ---- Responsive ----------------------------------------------------------------------- */

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding: 64px 0 84px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .cert-grid, .report-grid, .project-grid, .skills-grid { grid-template-columns: 1fr; }
  .course-wrap { grid-template-columns: 1fr; gap: 8px; }

  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    background: var(--sand);
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 18px;
    box-shadow: var(--shadow);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .nav-links a.nav-cta { margin-left: 0; text-align: center; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero-art svg { max-width: 320px; }
  .section { padding: 64px 0 72px; }
  .resume-panel { padding: 24px; }
  .hero-topo { display: none; }
}