/* ========================================================
   Oscar Jones — Portfolio
   Clean, light, technical aesthetic with a blueprint-blue accent
   ======================================================== */

:root {
  --ink: #16202b;
  --ink-soft: #4a5a68;
  --paper: #ffffff;
  --paper-alt: #f4f7fa;
  --line: #e1e8ee;
  --accent: #1f5fa6;
  --accent-dark: #163f70;
  --accent-soft: #e8f1fb;
  --radius: 10px;
  --shadow: 0 10px 30px -12px rgba(22, 32, 43, 0.18);
  --max-width: 1120px;
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

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

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

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

code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  background: var(--accent-soft);
  color: var(--accent-dark);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ---------- Layout helpers ---------- */
.section-inner, .nav-inner, .hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

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

.section h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 36px;
}

.section h2 .num {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.12em;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 12px;
  background: var(--paper);
}

.section-lede {
  max-width: 70ch;
  font-size: 1.05rem;
  margin-bottom: 40px;
}

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--accent); }

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 6px 2px;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--accent);
  transition: right 0.2s ease;
}
.nav-links a:hover::after { right: 0; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 40px; height: 40px;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--ink);
}

/* ---------- Hero ---------- */
.hero {
  padding: 15px 0 100px;
  background:
    radial-gradient(1100px 500px at 85% -10%, var(--accent-soft), transparent 60%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 8px 16px;
  margin-bottom: 22px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5.4vw, 3.6rem);
  max-width: 26ch;
  letter-spacing: -0.02em;
}

.hero-sub {
  max-width: 62ch;
  font-size: 1.12rem;
  margin-top: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.98rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 22px -8px rgba(31, 95, 166, 0.55);
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }

.btn-ghost {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin-top: 14px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
}

.about-photo img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: 20% center;
  border-radius: 50%;
  border: 4px solid var(--paper);
  box-shadow: var(--shadow);
}

.about-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  box-shadow: var(--shadow);
  align-self: start;
}
.about-card h3 { font-size: 1.05rem; margin-bottom: 14px; }
.about-card ul { margin: 0; padding-left: 1.15em; color: var(--ink-soft); }
.about-card li { margin-bottom: 10px; }
.about-card li:last-child { margin-bottom: 0; }
.about-card strong { color: var(--ink); }

.about-card { margin-top: 8px; }

@media (min-width: 760px) {
  .about-grid { grid-template-columns: 220px 1fr; }
  .about-photo { grid-column: 1; grid-row: 1 / span 2; }
  .about-text { grid-column: 2; grid-row: 1; }
  .about-card { grid-column: 2; grid-row: 2; }
}

/* ---------- Timeline (experience) ---------- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 36px;
  padding-left: 28px;
  border-left: 2px solid var(--line);
}

.timeline-item { position: relative; }

.timeline-marker {
  position: absolute;
  left: -36px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--paper-alt);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-content {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow);
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
}
.timeline-head h3 { font-size: 1.18rem; margin: 0; }
.timeline-date {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  white-space: nowrap;
}
.timeline-org {
  font-weight: 500;
  color: var(--ink);
  margin: 4px 0 12px;
  font-size: 0.96rem;
}
.muted { color: var(--ink-soft); font-weight: 400; font-size: 0.9em; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.chip {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-dark);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 6px 14px;
}

/* ---------- Projects ---------- */
.project {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
}
.project:first-of-type { border-top: none; padding-top: 0; }

@media (min-width: 880px) {
  .project { grid-template-columns: 1.05fr 1.3fr; align-items: start; gap: 44px; }
  .project-feature .project-media { order: 0; }
}

.project-media img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  width: 100%;
  object-fit: cover;
}

.project-media-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 10px;
}
.project-media-strip img {
  aspect-ratio: 4 / 3;
  box-shadow: none;
}

/* Medical device images */
.med-device-images {
  width: 100%;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.med-device-images img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  width: 100%;
  object-fit: cover;
}

.project-media-diagram { display: flex; align-items: stretch; }

.project-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.project h3 { font-size: 1.4rem; margin-bottom: 4px; }
.project-meta {
  font-family: var(--font-display);
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.project-points {
  margin: 0 0 16px;
  padding-left: 1.2em;
  color: var(--ink-soft);
}
.project-points li { margin-bottom: 10px; }
.project-points li:last-child { margin-bottom: 0; }
.project-points strong { color: var(--ink); }

.project-compact { grid-template-columns: 1fr; border-top: 1px solid var(--line); }
.project-compact .project-body { max-width: 78ch; }

/* code window (elevator project) */
.code-window {
  background: #16202b;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  width: 100%;
  align-self: stretch;
}
.code-window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: #0f1822;
}
.code-window-bar span {
  width: 11px; height: 11px; border-radius: 50%;
  background: #3a4a5a;
  display: inline-block;
}
.code-window-bar span:nth-child(1) { background: #e2685a; }
.code-window-bar span:nth-child(2) { background: #e0b15a; }
.code-window-bar span:nth-child(3) { background: #5ab97c; }
.code-title {
  margin-left: 10px;
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 0.8rem;
  color: #8fa3b5;
}
.code-window pre {
  margin: 0;
  padding: 20px 22px;
  overflow-x: auto;
}
.code-window code {
  background: none;
  color: #d7e2ec;
  padding: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  white-space: pre;
}

/* equation card (maglev project) */
.equation-card {
  background: var(--accent-dark);
  color: #eaf2fb;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 26px;
  width: 100%;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}
.equation-label {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #9cc1ea;
  margin: 14px 0 4px;
}
.equation-card .equation-label:first-child { margin-top: 0; }
.equation {
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.85;
  color: #eaf2fb;
  margin: 0;
}

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}
.skill-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow);
}
.skill-card h3 {
  font-size: 1.02rem;
  color: var(--accent-dark);
  margin-bottom: 10px;
}
.skill-card p { margin: 0; font-size: 0.93rem; }

/* ---------- Contact ---------- */
.contact-section { text-align: left; }
.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 8px;
}
.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 14px 24px;
  font-weight: 500;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
  transform: translateY(-1px);
}
.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 700;
}
.contact-link-cv {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.contact-link-cv .contact-icon { background: rgba(255,255,255,0.18); color: #fff; }
.contact-link-cv:hover { background: var(--accent-dark); color: #fff; border-color: var(--accent-dark); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  text-align: center;
}
.site-footer p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 16px 28px;
    gap: 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }

  .about-grid { grid-template-columns: 1fr; }
  .about-photo { max-width: 180px; margin: 0 auto; }
  .about-photo, .about-text, .about-card { grid-column: 1 !important; grid-row: auto !important; }

  .project-media-strip { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 64px 0; }
  .hero { padding: 88px 0 64px; }
}