/* ============================================================
   jeffrey.css
   A stylesheet that feels like: rigorous, practical, systems-minded,
   warm-but-not-squishy, and always aiming for "make it solid."
   ============================================================ */

:root {
  /* Calm, high-contrast, readable. */
  --ink: hsl(220 18% 18%);          /* precise, not harsh */
  --paper: hsl(45 25% 97%);         /* warm-white, "real notebook" */
  --muted: hsl(220 12% 45%);        /* explanatory, not shouty */
  --accent: hsl(212 85% 45%);       /* clear "this matters" */
  --accent-light: hsl(212 85% 90%); /* light variant for backgrounds */
  --accent-subtle: hsl(212 85% 96%);/* subtle variant for hover states */
  --accent-dark: hsl(212 85% 35%);  /* dark variant for emphasis */
  --accent-2: hsl(160 55% 35%);     /* grounded "ship it" */
  --warn: hsl(22 90% 52%);          /* practical caution */
  --ok: hsl(140 55% 35%);

  /* Structure + breathing room. */
  --radius: 14px;                   /* friendly, not fluffy */
  --radius-sm: 10px;
  --shadow: 0 10px 30px hsl(220 25% 15% / .10);
  --shadow-hard: 0 1px 0 hsl(220 25% 15% / .15);
  --border: 1px solid hsl(220 18% 88%);

  /* "Teach it so it sticks." */
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --lh: 1.55;

  /* Deliberate pace. */
  --space-1: .35rem;
  --space-2: .6rem;
  --space-3: .95rem;
  --space-4: 1.4rem;
  --space-5: 2rem;

  /* Constraint: useful, not maximal. */
  --measure: 72ch;
}

/* ------------------------------------------------------------
   Base: clarity first
   ------------------------------------------------------------ */
* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(180deg, var(--paper), hsl(45 25% 95%));
  font-family: var(--font);
  line-height: var(--lh);
  letter-spacing: .01em;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ------------------------------------------------------------
   Layout: "organized, predictable, scalable"
   ------------------------------------------------------------ */
main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
  flex: 1;
  width: 100%;
}

section {
  margin-block: var(--space-5);
}

.container {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ------------------------------------------------------------
   Navigation
   ------------------------------------------------------------ */
.site-nav {
  position: sticky;
  top: 0;
  background: linear-gradient(180deg, var(--paper), hsl(45 25% 96%));
  border-bottom: var(--border);
  z-index: 100;
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.nav-left {
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border: none;
}

.nav-links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  border: none;
  padding: var(--space-2) 0;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

/* Mobile navigation */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border-bottom: var(--border);
    box-shadow: 0 4px 12px hsl(220 25% 15% / 0.08);
    padding: var(--space-2) 0;
  }

  .nav-links--open {
    display: flex;
  }

  .nav-links li {
    border-bottom: 1px solid hsl(220 18% 18% / 0.06);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    display: block;
    padding: var(--space-3) var(--space-4);
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
  }

  .nav-toggle__bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--ink);
    border-radius: 1px;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-toggle--active .nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle--active .nav-toggle__bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle--active .nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }
}

.back-nav {
  padding: var(--space-3) 0;
  border-bottom: var(--border);
}

.back-nav a {
  font-size: 14px;
  color: var(--muted);
}

/* ------------------------------------------------------------
   Headings: decisive, not dramatic
   ------------------------------------------------------------ */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.15;
  margin: 0 0 var(--space-3) 0;
  font-weight: 600;
}

h1 {
  font-size: clamp(1.8rem, 2.2vw + 1rem, 2.6rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.35rem, 1.3vw + 1rem, 1.9rem);
  border-bottom: var(--border);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
}

h3 {
  font-size: 1.15rem;
  color: hsl(220 18% 26%);
}

h4 {
  font-size: 1.05rem;
  color: hsl(220 18% 30%);
}

/* ------------------------------------------------------------
   Paragraphs: "show your work"
   ------------------------------------------------------------ */
p {
  margin: 0 0 var(--space-3) 0;
}

p:last-child {
  margin-bottom: 0;
}

small,
.muted {
  color: var(--muted);
}

strong {
  font-weight: 650;
}

em {
  font-style: italic;
}

/* ------------------------------------------------------------
   Links: direct, minimal fuss
   ------------------------------------------------------------ */
a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid hsl(212 85% 45% / .35);
  transition: border-color 0.2s ease;
}

a:hover {
  border-bottom-color: currentColor;
}

a:focus-visible {
  outline: 3px solid hsl(212 85% 45% / .35);
  outline-offset: 2px;
  border-radius: 10px;
}

/* ------------------------------------------------------------
   Homepage Hero
   ------------------------------------------------------------ */
.hero-home {
  padding: var(--space-5) 0;
}

.hero-title {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: var(--space-4);
  font-weight: 400;
}

.hero-bio {
  max-width: 68ch;
  margin-bottom: var(--space-4);
}

.hero-bio p {
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.location {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-links {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  border: 1px solid hsl(212 85% 45% / .35);
  background: hsl(0 0% 100% / .65);
  color: var(--ink);
  box-shadow: var(--shadow-hard);
  transition: transform .06s ease, box-shadow .12s ease, background .12s ease;
  min-height: 44px;
}

.hero-link:hover {
  background: hsl(0 0% 100% / .9);
  box-shadow: var(--shadow);
  border-bottom: 1px solid hsl(212 85% 45% / .35);
}

.hero-link:active {
  transform: translateY(1px);
}

.link-arrow {
  font-size: 1.1rem;
}

/* ------------------------------------------------------------
   Background Section
   ------------------------------------------------------------ */
.background-teaser {
  padding: var(--space-5) 0;
  border-top: var(--border);
}

.background-summary {
  max-width: 68ch;
  margin-bottom: var(--space-4);
}

.background-summary p {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.background-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.background-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--accent);
}

/* ------------------------------------------------------------
   Cards: careful structure + approachable warmth
   ------------------------------------------------------------ */
.card,
.project-card,
.position-card,
.publication,
.tech-project-card,
.service-card {
  background: hsl(0 0% 100% / .75);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow), var(--shadow-hard);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  transition: box-shadow 0.2s ease, transform 0.1s ease;
}

.card:hover,
.project-card:hover,
.position-card:hover {
  box-shadow: 0 15px 40px hsl(220 25% 15% / .15), var(--shadow-hard);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.project-card h3 {
  margin-bottom: 0;
}

.project-status {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project-status.live {
  background: hsl(140 55% 90%);
  color: var(--ok);
}

.project-status.development {
  background: var(--accent-light);
  color: var(--accent);
}

.project-status.mvp {
  background: hsl(45 90% 88%);
  color: hsl(22 90% 35%);
}

.project-status.production {
  background: hsl(160 55% 88%);
  color: var(--accent-2);
}

.project-description {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--ink);
  margin-bottom: var(--space-3);
}

.project-tech {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}

.tech-tag {
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 0.8rem;
  background: hsl(220 25% 96%);
  border: var(--border);
  border-radius: var(--radius-sm);
  color: var(--muted);
}

.project-links {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.project-link.external::after {
  content: " ↗";
}

/* ------------------------------------------------------------
   Technical Foundation
   ------------------------------------------------------------ */
.technical-foundation {
  padding: var(--space-5) 0;
  background: linear-gradient(180deg, hsl(45 25% 96%), hsl(45 25% 94%));
  border-top: var(--border);
  border-radius: var(--radius);
}

.foundation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.foundation-area h3 {
  font-size: 1rem;
  margin-bottom: var(--space-2);
}

.foundation-area p {
  font-size: 0.9rem;
  color: var(--muted);
}

/* ------------------------------------------------------------
   Projects Section (legacy)
   ------------------------------------------------------------ */
.projects-section {
  padding: var(--space-5) 0;
  border-top: var(--border);
}

/* ------------------------------------------------------------
   Approach Section
   ------------------------------------------------------------ */
.approach-section {
  padding: var(--space-5) 0;
  border-top: var(--border);
}

.approach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.approach-card {
  background: hsl(0 0% 100% / .75);
  border: var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow 0.2s ease;
}

.approach-card:hover {
  box-shadow: 0 15px 40px hsl(220 25% 15% / .15), var(--shadow-hard);
}

/* Theme-specific top borders */
.approach-card--governance {
  border-top: 3px solid var(--accent);
}

.approach-card--complexity {
  border-top: 3px solid var(--accent-2);
}

.approach-card--hardware {
  border-top: 3px solid var(--warn);
}

.approach-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.approach-header h3 {
  margin-bottom: 0;
  font-size: 1.15rem;
}

.approach-tag {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 999px;
  background: hsl(220 25% 96%);
  color: var(--muted);
  font-weight: 600;
}

.approach-thesis {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
}

.approach-aspects {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.aspect-tag {
  font-family: var(--mono);
  font-size: 0.75rem;
  background: hsl(45 25% 96%);
  border: var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  color: var(--muted);
}

.approach-case-study {
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: var(--border);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.case-study-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  font-weight: 600;
}

.case-study-link {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.95rem;
}

/* Case study context labels on project detail pages */
.case-study-context {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: var(--space-2);
}

.case-study-context a {
  color: var(--accent);
}

/* ------------------------------------------------------------
   Experience Page Components
   ------------------------------------------------------------ */
.experience-page,
.research-page,
.project-detail {
  padding: var(--space-4) 0 var(--space-5);
}

/* Experience page layout variables */
.experience-page {
  --section-gap: clamp(3rem, 8vw, 6rem);
  --content-max-width: 72ch;
  --braid-max-width: 1000px;
}

/* Experience hero / braid area */
.experience-hero {
  padding: var(--space-5) var(--space-4);
  text-align: center;
}

.experience-hero__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 var(--space-2);
  color: var(--ink);
}

.experience-hero__subtitle {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--muted);
  margin: 0 0 var(--space-4);
}

.braid-container {
  max-width: var(--braid-max-width);
  margin: 0 auto var(--space-3);
  padding: 0 var(--space-3);
}

.braid-svg {
  width: 100%;
  height: auto;
  display: block;
}

.experience-hero__hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}

/* Experience content sections */
.experience-content {
  max-width: calc(var(--content-max-width) + 2 * var(--space-4));
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.era-section {
  padding: var(--section-gap) 0;
  border-top: 1px solid hsl(220 18% 18% / 0.08);
}

.era-section:first-of-type {
  border-top: none;
}

.era-section__header {
  margin-bottom: var(--space-4);
}

.era-section__title {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 var(--space-1);
  color: var(--ink);
}

.era-section__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  font-size: 0.9rem;
  color: var(--muted);
}

.era-section__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.era-section__body {
  line-height: 1.65;
}

.era-section__body p {
  margin: 0 0 var(--space-3);
}

.era-section__body p:last-child {
  margin-bottom: 0;
}

/* Bento grid for experience page */
.bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

@media (min-width: 640px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .bento-grid__item--wide {
    grid-column: span 2;
  }
}

.bento-card {
  background: hsl(0 0% 100% / 0.75);
  border: 1px solid hsl(220 18% 18% / 0.08);
  border-radius: var(--radius);
  padding: var(--space-4);
  transition: box-shadow 0.2s ease;
}

.bento-card:hover {
  box-shadow: var(--shadow);
}

.bento-card__title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 var(--space-2);
}

.bento-card__content {
  font-size: 0.95rem;
  color: var(--ink);
}

/* Role cards within bento */
.role {
  margin-bottom: var(--space-3);
}

.role:last-child {
  margin-bottom: 0;
}

.role__title {
  font-weight: 600;
  margin: 0 0 var(--space-1);
}

.role__org {
  color: var(--muted);
  font-size: 0.9rem;
}

.role__detail {
  font-size: 0.9rem;
  color: var(--muted);
  margin: var(--space-1) 0 0;
}

/* Project cards within bento */
.experience-page .project {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid hsl(220 18% 18% / 0.06);
}

.experience-page .project:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.experience-page .project:first-child {
  padding-top: 0;
}

.project__name {
  font-weight: 600;
  font-size: 0.95rem;
}

.project__desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin: var(--space-1) 0 0;
}

/* Status badges */
.badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.2em 0.6em;
  border-radius: 999px;
  white-space: nowrap;
}

.badge--production {
  background: var(--ok);
  color: white;
}

.badge--live {
  background: var(--accent-2);
  color: white;
}

.badge--development {
  background: var(--accent);
  color: white;
}

.badge--tenured {
  background: var(--accent);
  color: white;
}

/* Light sections (earlier eras) */
.era-section--light .era-section__body {
  max-width: 60ch;
}

/* Highlights list for light sections */
.highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: 0;
  list-style: none;
}

.highlights li {
  font-size: 0.85rem;
  color: var(--muted);
  padding-left: 1.2em;
  position: relative;
}

.highlights li::before {
  content: "\00B7";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  background: hsl(0 0% 100% / 0.9);
  border: 1px solid hsl(220 18% 18% / 0.1);
  border-radius: 999px;
  padding: var(--space-2) var(--space-3);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease, color 0.2s ease;
  box-shadow: 0 4px 12px hsl(220 25% 15% / 0.1);
  z-index: 100;
}

.back-to-top:hover {
  color: var(--accent);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

/* Experience page responsive adjustments */
@media (max-width: 640px) {
  .braid-container {
    padding: 0 var(--space-2);
    overflow-x: auto;
  }

  .braid-svg {
    min-width: 700px;
  }

  .era-section {
    padding: var(--space-5) 0;
  }

  .bento-card {
    padding: var(--space-3);
  }

  .back-to-top {
    bottom: var(--space-3);
    right: var(--space-3);
  }
}

.page-header {
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: var(--border);
}

.page-subtitle {
  font-size: 1rem;
  font-weight: 400;
  color: var(--muted);
  margin-top: var(--space-2);
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background: var(--accent-subtle);
  border-radius: var(--radius);
  border: var(--border);
}

.highlight-stat {
  text-align: center;
}

.highlight-stat h3 {
  font-size: 2.2rem;
  color: var(--accent);
  margin-bottom: var(--space-1);
  border: none;
  padding: 0;
}

.highlight-stat p {
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 0;
}

.stat-detail {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
}

/* ------------------------------------------------------------
   Position Cards
   ------------------------------------------------------------ */
.position-section,
.publication-section {
  margin-bottom: var(--space-5);
}

.position-header {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: var(--border);
}

.position-header h3 {
  margin-bottom: var(--space-2);
  border: none;
  padding: 0;
}

.institution {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.dates {
  font-size: 0.85rem;
  color: var(--muted);
}

.position-body h4 {
  margin-top: var(--space-3);
  margin-bottom: var(--space-2);
}

.emphasis {
  font-style: italic;
  color: var(--ink);
  margin-bottom: var(--space-2);
}

.course-categories {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.course-cat {
  padding: var(--space-3);
  background: hsl(45 25% 96%);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
}

.course-cat strong {
  color: var(--accent);
  display: block;
  margin-bottom: 4px;
}

/* ------------------------------------------------------------
   Callouts: "here's what matters, here's why"
   ------------------------------------------------------------ */
.callout,
.service-card {
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  border-left: 5px solid var(--accent);
  background: hsl(212 85% 45% / .06);
  margin-bottom: var(--space-3);
  box-shadow: none;
}

.callout.ok {
  border-left-color: var(--ok);
  background: hsl(140 55% 35% / .08);
}

.callout.warn {
  border-left-color: var(--warn);
  background: hsl(22 90% 52% / .10);
}

.service-card h3 {
  font-size: 1.05rem;
  margin-bottom: var(--space-2);
  border: none;
  padding: 0;
}

/* ------------------------------------------------------------
   Lists: neat, purposeful
   ------------------------------------------------------------ */
ul,
ol {
  margin: 0 0 var(--space-3) 1.2rem;
  padding: 0;
}

li {
  margin: .25rem 0;
}

.achievement-list,
.service-list,
.depth-list,
.question-list,
.education-list {
  list-style: disc;
  margin-left: 1.5rem;
}

.achievement-list li,
.service-list li,
.depth-list li,
.question-list li,
.education-list li {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-2);
}

/* ------------------------------------------------------------
   Skills Translation
   ------------------------------------------------------------ */
.skills-translation-section {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background: hsl(45 25% 96%);
  border-radius: var(--radius);
}

.translation-grid {
  display: grid;
  gap: var(--space-4);
}

.translation-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3);
  background: hsl(0 0% 100% / .75);
  border-radius: var(--radius-sm);
  border: var(--border);
}

@media (max-width: 768px) {
  .translation-row {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .translation-row .arrow {
    transform: rotate(90deg);
  }
}

.from-skill,
.to-skill {
  padding: var(--space-2);
}

.from-skill h4,
.to-skill h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-1);
}

.from-skill {
  background: hsl(220 25% 96%);
  border-radius: var(--radius-sm);
}

.to-skill {
  background: var(--accent-subtle);
  border-radius: var(--radius-sm);
}

.from-skill p,
.to-skill p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
}

.arrow {
  font-size: 1.5rem;
  color: var(--accent);
  font-weight: 600;
}

/* ------------------------------------------------------------
   Development Grid
   ------------------------------------------------------------ */
.professional-development-section {
  margin-bottom: var(--space-5);
}

.dev-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}

.dev-item {
  padding: var(--space-3);
  border: var(--border);
  border-radius: var(--radius-sm);
  background: hsl(0 0% 100% / .75);
}

.dev-item h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
}

.year {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.dev-item p {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ------------------------------------------------------------
   Research Page
   ------------------------------------------------------------ */
.publication h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-2);
  border: none;
  padding: 0;
}

.authors {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.publication-venue {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.doi {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.publication-details {
  margin: var(--space-2) 0;
  padding: var(--space-3);
  background: hsl(45 25% 96%);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
}

.publication-details p {
  font-size: 0.85rem;
  line-height: 1.5;
  margin-bottom: var(--space-1);
}

.publication-summary {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.dissertation-title {
  font-style: italic;
  font-size: 1.05rem;
  margin-bottom: var(--space-2);
}

.field {
  font-size: 0.85rem;
  color: var(--muted);
}

.dissertation-link {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
}

.coming-soon {
  font-size: 0.8rem;
  color: var(--muted);
  font-style: italic;
  margin-top: 4px;
}

.theoretical-foundation {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background: hsl(45 25% 96%);
  border-radius: var(--radius);
}

.theory-collaboration,
.topics-explored,
.theory-practice-connection {
  margin-bottom: var(--space-4);
}

.topic-area {
  margin-bottom: var(--space-3);
  padding: var(--space-3);
  background: hsl(0 0% 100% / .75);
  border-radius: var(--radius-sm);
  border: var(--border);
}

.topic-area h4 {
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
  color: var(--accent);
}

.topic-area ul {
  margin-left: 1.5rem;
}

.topic-area li {
  font-size: 0.85rem;
  line-height: 1.5;
}

.education-section,
.continuing-education {
  margin-bottom: var(--space-5);
}

.degree {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: var(--border);
}

.degree:last-child {
  border-bottom: none;
}

.degree h3 {
  font-size: 1.05rem;
  margin-bottom: var(--space-2);
  border: none;
  padding: 0;
}

.advisor {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ------------------------------------------------------------
   Project Detail Pages
   ------------------------------------------------------------ */
.project-header-detail {
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: var(--border);
}

.project-subtitle {
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--muted);
  margin-bottom: var(--space-2);
}

.project-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.external-link {
  font-size: 0.9rem;
  font-weight: 600;
}

.external-link::after {
  content: " ↗";
}

.project-overview,
.project-architecture,
.project-significance,
.project-technical-depth,
.project-context,
.project-questions,
.project-theoretical-foundation {
  margin-bottom: var(--space-5);
}

.architecture-section {
  margin-bottom: var(--space-4);
}

.architecture-section h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-2);
  border: none;
  padding: 0;
}

.architecture-section ul {
  margin-left: 1.5rem;
}

.architecture-section li {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-2);
}

.significance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-3);
}

.significance-point {
  padding: var(--space-3);
  border: var(--border);
  border-radius: var(--radius-sm);
  background: hsl(0 0% 100% / .75);
}

.significance-point h3 {
  font-size: 1.05rem;
  margin-bottom: var(--space-2);
  color: var(--accent);
  border: none;
  padding: 0;
}

.significance-point p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.theory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}

.theory-area {
  padding: var(--space-3);
  background: hsl(45 25% 96%);
  border-radius: var(--radius-sm);
}

.theory-area h3 {
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
  color: var(--accent);
  border: none;
  padding: 0;
}

.theory-area p {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted);
}

.project-links-footer {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: var(--border);
  text-align: center;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 1rem;
  font-weight: 600;
  color: hsl(0 0% 100%);
  background: var(--accent);
  text-decoration: none;
  border: none;
  padding: var(--space-3) var(--space-4);
  border-radius: 999px;
  transition: background 0.2s ease, transform 0.1s ease;
  min-height: 44px;
}

.primary-link:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.primary-link:active {
  transform: translateY(0);
}

/* ------------------------------------------------------------
   Section Links
   ------------------------------------------------------------ */
.section-links {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: var(--border);
}

.section-link,
.section-link-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.9rem;
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  border: 1px solid hsl(212 85% 45% / .35);
  background: hsl(0 0% 100% / .65);
  color: var(--ink);
  box-shadow: var(--shadow-hard);
  transition: transform .06s ease, box-shadow .12s ease, background .12s ease;
  min-height: 44px;
}

.section-link:hover,
.section-link-btn:hover {
  background: hsl(0 0% 100% / .9);
  box-shadow: var(--shadow);
  border-bottom: 1px solid hsl(212 85% 45% / .35);
}

.section-link:active,
.section-link-btn:active {
  transform: translateY(1px);
}

/* ------------------------------------------------------------
   Code: you build systems; you name things carefully
   ------------------------------------------------------------ */
code,
pre {
  font-family: var(--mono);
  font-size: .95em;
}

pre {
  margin: var(--space-3) 0;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  border: var(--border);
  background: hsl(220 25% 98%);
  overflow: auto;
}

/* ------------------------------------------------------------
   Tables: the "math prof / editor" vibe
   ------------------------------------------------------------ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
  font-variant-numeric: tabular-nums;
}

th,
td {
  border-bottom: var(--border);
  padding: .6rem .5rem;
  vertical-align: top;
}

th {
  text-align: left;
  color: hsl(220 18% 26%);
  background: hsl(45 25% 96%);
}

/* ------------------------------------------------------------
   Buttons: practical, confident, low drama
   ------------------------------------------------------------ */
.button {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .6rem .9rem;
  border-radius: 999px;
  border: 1px solid hsl(212 85% 45% / .35);
  background: hsl(0 0% 100% / .65);
  color: var(--ink);
  box-shadow: var(--shadow-hard);
  cursor: pointer;
  transition: transform .06s ease, box-shadow .12s ease, background .12s ease;
}

.button:hover {
  background: hsl(0 0% 100% / .9);
  box-shadow: var(--shadow);
}

.button:active {
  transform: translateY(1px);
}

/* ------------------------------------------------------------
   Tech Project Cards
   ------------------------------------------------------------ */
.tech-section {
  margin-bottom: var(--space-5);
}

.section-intro {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: var(--space-4);
}

.tech-project-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-2);
  border: none;
  padding: 0;
}

.status-badge,
.tech-badge {
  padding: 4px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-badge {
  background: hsl(140 55% 90%);
  color: var(--ok);
}

.tech-badge {
  background: hsl(220 25% 96%);
  color: var(--muted);
  border: var(--border);
}

.project-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: var(--space-2);
}

.project-impact {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--ink);
  margin-top: var(--space-2);
}

/* ------------------------------------------------------------
   Community Section
   ------------------------------------------------------------ */
.community-section {
  margin-bottom: var(--space-5);
}

/* ------------------------------------------------------------
   Skip Links (Accessibility)
   ------------------------------------------------------------ */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: 1000;
  text-decoration: none;
  border: none;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

/* ------------------------------------------------------------
   Contact Page
   ------------------------------------------------------------ */
.contact-section {
  padding: var(--space-5) 0;
}

.contact-content {
  display: grid;
  gap: var(--space-4);
  max-width: 60ch;
}

.contact-block {
  padding: var(--space-4);
  background: hsl(0 0% 100% / 0.75);
  border: var(--border);
  border-radius: var(--radius);
  transition: box-shadow 0.2s ease;
}

.contact-block:hover {
  box-shadow: var(--shadow);
}

.contact-block h2 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 var(--space-2);
  border: none;
  padding: 0;
}

.contact-block p {
  font-size: 1.05rem;
  margin: 0;
}

.contact-block a {
  font-weight: 500;
}

.profile-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.profile-links li {
  margin: 0;
}

.profile-links a {
  font-weight: 500;
}

/* ------------------------------------------------------------
   CV Page
   ------------------------------------------------------------ */
.cv-section {
  padding: var(--space-5) 0;
}

.cv-subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: var(--space-4);
}

.cv-download {
  padding: var(--space-3);
  background: hsl(45 25% 96%);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-5);
  font-size: 0.9rem;
}

.cv-download p {
  margin: 0 0 var(--space-1);
}

.cv-download p:last-child {
  margin-bottom: 0;
}

.cv-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.cv-block {
  padding-bottom: var(--space-4);
  border-bottom: var(--border);
}

.cv-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.cv-block h2 {
  margin-bottom: var(--space-4);
}

.cv-entry {
  margin-bottom: var(--space-4);
}

.cv-entry:last-child {
  margin-bottom: 0;
}

.cv-entry h3 {
  font-size: 1rem;
  margin-bottom: var(--space-1);
  border: none;
  padding: 0;
}

.cv-institution {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-1);
}

.cv-details {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: var(--space-1);
}

.cv-publication {
  font-size: 0.95rem;
  line-height: 1.6;
}

.cv-more {
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: var(--space-3);
}

.cv-list {
  margin-left: 1.5rem;
}

.cv-list li {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--space-2);
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.site-footer {
  margin-top: auto;
  padding: var(--space-4) 0;
  border-top: var(--border);
  text-align: center;
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}

.site-footer a {
  color: var(--accent);
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.footer-links a:hover {
  border-bottom-color: var(--accent);
}

/* ------------------------------------------------------------
   Focus: accessibility as a quiet default
   ------------------------------------------------------------ */
:focus-visible {
  outline: 3px solid hsl(212 85% 45% / .35);
  outline-offset: 2px;
  border-radius: 10px;
}

/* ------------------------------------------------------------
   The signature move: "clear constraints beat clever hacks"
   ------------------------------------------------------------ */
.constrain {
  max-width: var(--measure);
}

.rule-of-thumb {
  font-weight: 650;
  background: linear-gradient(180deg,
      transparent 55%,
      hsl(212 85% 45% / .15) 55%,
      hsl(212 85% 45% / .15) 95%,
      transparent 95%);
  padding: 0 .12em;
  border-radius: .25em;
}

/* ------------------------------------------------------------
   Utilities
   ------------------------------------------------------------ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ------------------------------------------------------------
   Reduced Motion Support
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }

  .hero-link,
  .section-link,
  .section-link-btn,
  .button,
  .project-card,
  .position-card,
  .contact-block,
  .bento-card,
  .nav-links a,
  .primary-link {
    transition: none;
  }
}

/* ------------------------------------------------------------
   Print Styles
   ------------------------------------------------------------ */
@media print {
  .site-nav,
  .back-nav,
  .site-footer,
  .hero-links,
  .project-links,
  .section-links,
  .skip-link {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    background: white;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .project-card,
  .position-card,
  .publication {
    border: 1px solid #000;
    page-break-inside: avoid;
    box-shadow: none;
  }
}