/* ============================================================
   NATHANIEL ROGERS — PORTFOLIO STYLESHEET
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,300;0,400;0,600;0,700;1,400&display=swap');

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
  --teal:        #4a9e8e;
  --teal-dark:   #3d8578;
  --crimson:     #8b1a1a;
  --crimson-mid: #a52020;
  --black:       #111111;
  --grey-dark:   #333333;
  --grey-mid:    #666666;
  --grey-light:  #f2f2f2;
  --white:       #ffffff;
  --border:      #dddddd;

  --font-title:  'Space Grotesk', Georgia, 'Times New Roman', serif;
  --font-sans:   Montserrat, 'Source Sans 3', sans-serif;

  --nav-height:  56px;
  --max-w:       1500px;
  --page-pad:    clamp(1rem, 4vw, 3rem);
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--grey-dark);
  background: var(--white);
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }

/* ── Navigation ─────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--page-pad);
}

.nav-inner {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-links li {
  display: flex;
  align-items: center;
}

.nav-links li + li::before {
  content: '';
  display: inline-block;
  width: 1px;
  height: 14px;
  background: var(--grey-mid);
  margin: 0 14px;
}

.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--grey-dark);
  text-decoration: none;
  
}

/* Hover: bold ONLY */
.nav-links a:hover {
  color: var(--black);
  font-weight: 600;
  transition: color 0.3s, font-weight 0.3s;
}

/* Active: bold + underline */
.nav-links a.active {
  color: var(--black);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── Back Arrow (project pages) ─────────────────────────────── */
.back-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-title);
  font-size: 0.875rem;
  color: var(--black);
  padding: var(--page-pad) var(--page-pad) 0;
  max-width: var(--max-w);
  margin: 0 auto;
  display: block;
}

a.back-arrow:hover { 
  color: var(--white) !important; 
  transition: color 0.3s;
}

/* ── Hero Banner (teal top section) ─────────────────────────── */
.hero {
  background: var(--teal);
  color: var(--white);
  padding: 0;
  overflow: hidden;
}

.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 420px;
}

.hero-image-col {
  background: #e8e8e8;
  overflow: hidden;
  position: relative;
}

.hero-image-col .img-placeholder {
  width: 100%;
  height: 100%;
  min-height: 360px;
  object-fit: cover;
}

.hero-image-col img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-text-col {
  background: var(--teal);
  padding: clamp(2rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Project hero (narrower, with image left) */
.project-hero .hero-image-col {
  max-width: 340px;
}

/* ── Typography ─────────────────────────────────────────────── */
.display-heading {
  font-family: var(--font-title);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: normal;
  line-height: 1.05;
  color: var(--black);
  text-align: center;
}

.display-heading.light { 
  color: var(--black); 
  text-align: left
}

.display-heading.large { 
  color: var(--black); 
  text-align: left;
  font-size: clamp(3.5rem, 8vw, 6rem);
}

.section-heading {
  font-family: var(--font-title);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: normal;
  color: var(--black);
  margin-bottom: 0.5rem;
}

.project-title {
  font-family: var(--font-title);
  font-size: clamp(2rem, 6vw, 5rem);
  font-weight: normal;
  color: var(--black);
  line-height: 1.1;
  text-align: center;
}

.project-subtitle {
  font-family: var(--font-title);
  font-size: clamp(.8rem, 1.5vw, 1.2rem);
  color: var(--black);
  margin-top: 15rem;
  line-height: 1.5;
  max-width: 340px;
  margin-left: auto;
  text-align: right;
}


h1.disclaimer-text {
  font-family: var(--font-title);
  color: var(--crimson);
  font-style: italic;
}

/* ── Skill Tags Bar ─────────────────────────────────────────── */
.skill-bar {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--white);
  padding: 0.85rem var(--page-pad);
}

.skill-bar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: block;
  text-align: center;
}

.skill-bar-label,
.skill-tag {
  font-family: var(--font-title);
  font-size: 1.2rem;
  letter-spacing: 0.01em;
}

.skill-bar-label {
  color: var(--teal);
  font-weight: 600;
}

.skill-tag {
  color: var(--black);
  display: inline;
  padding: 0;
  margin: 0 0.25rem;
  position: relative;
}

.skill-tag--grey {
  color: var(--grey-mid);
}

.skill-tag::after {
  content: ',\00a0';
}

.skill-tag:last-child::after {
  content: '';
}

.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* ── Asterisk Section Marker ────────────────────────────────── */
.section-marker {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.asterisk {
  font-size: 5rem;
  font-family: var(--font-title);
  color: var(--teal);
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.section-about {
  padding: clamp(2rem, 5vw, 3.5rem) var(--page-pad);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
/* ── Content Sections ───────────────────────────────────────── */
.section {
  padding: clamp(2rem, 5vw, 3.5rem) var(--page-pad);
  /* two columns, one narrow for vertical story nav bar, one for content*/
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0;
}

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section.grey { 
  background: var(--grey-light);
}

.section-about.grey { background: var(--grey-light); }


/* ── Sticky Vertical Narrative Labels ─────────────────────── */


.story-block {
  display: grid;

  /* narrow sidebar column */
  grid-template-columns: 42px 1fr;

  gap: 0;

  align-items: start;

  max-width: var(--max-w);
  margin: 0;

  /* add this */
  padding-block: 2rem;

  /* full-height dark red tinted column */
  background:
    linear-gradient(
      to right,
      rgba(139, 26, 26, 0.05) 0,
      rgba(139, 26, 26, 0.05) 42px,
      transparent 42px
    );
}

.story-label {
  position: sticky;
  top: 50vh;
  transform: rotate(180deg);
  align-self: start;

  /* vertical sizing */
  height: fit-content;

  /* typography */
  font-family: 'Space Grotesk', Georgia, serif;
  font-size: 2rem;
  color: var(--teal);

  /* vertical text */
  writing-mode: vertical-rl;
  transform: rotate(180deg);

  line-height: 1;

  /* subtle appearance */
  opacity: 0.8;
}

/* Mobile */
@media (max-width: 768px) {
  .story-block {
    grid-template-columns: 1fr;
  }

  .story-label {
    display: none;
  }
}

/* Two-column content layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

/* Vertically center the right-hand image column in the ECG challenge section */
#challenge .two-col > div:last-child {
  align-self: center;
}

.two-col.reverse { direction: rtl; }
.two-col.reverse > * { direction: ltr; }

/* Three-column grid */
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* Center image + caption inside product three-column items */
#product .three-col > div {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── Image Placeholders ─────────────────────────────────────── */
.img-placeholder {
  background: #d8d8d8;
  border: 1px solid #c0c0c0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--grey-mid);
  font-size: 0.78rem;
  font-family: var(--font-sans);
  text-align: center;
  padding: 1rem;
  border-radius: 2px;
}

.img-placeholder .placeholder-icon {
  font-size: 1.4rem;
  opacity: 0.5;
}

.img-placeholder.tall { min-height: 260px; }
.img-placeholder.medium { min-height: 180px; }
.img-placeholder.short { min-height: 120px; }
.img-placeholder.square { aspect-ratio: 1; }
.img-placeholder.portrait { aspect-ratio: 3/4; }
.img-placeholder.wide { aspect-ratio: 16/9; min-height: 200px; }

/* Teal-bordered image box (used in project pages) */
.teal-framed {
  border: 2px solid var(--teal);
  border-radius: 2px;
  overflow: hidden;
  display: inline-block;
  line-height: 0;
  width: fit-content;
}

.teal-framed img {
  display: block;
  width: 100%;
  height: auto;
}

/* center project images */
.project-image {
  display:flex; 
  flex-direction:column; 
  align-items:center;
}

/* ── Caption ─────────────────────────────────────────────────── */
.caption {
  font-family: var(--font-title);
  font-size: 0.8rem;
  color: var(--grey-mid);
  text-align: center;
  margin-top: 0.5rem;
  padding-bottom: 1rem;
}

.document-link {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ── Body Text Formatting ────────────────────────────────────── */
.prose p { margin-bottom: 1rem; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 700; }
.prose em { font-style: italic; }

.prose ol, .prose ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.prose li { margin-bottom: 0.35rem; }

/* ── Contribution Item ───────────────────────────────────────── */
.contribution {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 3vw, 3rem);
  align-items: center;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

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

/* Individual contribution fade-in states (animate on scroll) */
.contribution {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.contribution.visible {
  opacity: 1;
  transform: none;
}

/* Center the image or media inside the contribution's media column
   and stack captions beneath images */
.contribution > div:last-child {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.contribution > div:last-child img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Ensure captions inside the media column span the full width and sit below images */
.contribution > div:last-child .caption {
  width: 100%;
  text-align: center;
  margin-top: 0;
  padding-bottom: 0.5rem;
}

.contribution.flip { direction: rtl; }
.contribution.flip > * { direction: ltr; }

.contribution-text h3 {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: normal;
  margin-bottom: 0.6rem;
  color: var(--black);
}

.contribution-text p {
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ── Features Grid ───────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.feature-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.feature-card h4 {
  font-family: var(--font-title);
  font-weight: normal;
  font-size: 1rem;
  color: var(--black);
}

/* ── Centered Heading Block ──────────────────────────────────── */
.heading-block {
  text-align: center;
  margin-bottom: 2rem;
}

.heading-block .section-heading {
  display: inline-block;
  border-bottom: 2px solid var(--teal);
  padding-bottom: 0.25rem;
}

/* ── Footer / Contact Bar ────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem var(--page-pad);
  background: var(--white);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-photo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
}

.footer-photo .img-placeholder {
  width: 44px;
  height: 44px;
  font-size: 0.6rem;
  min-height: unset;
}

.footer-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-title);
  font-size: 0.85rem;
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.3s;
}

.footer-link:hover { 
  color: var(--crimson); 
}

.footer-icon {
  width: 18px;
  height: 18px;
  color: var(--teal);
  flex-shrink: 0;
}

.footer-link:hover .footer-icon {
  color: var(--crimson);
  transition: color 0.3s;
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--grey-mid);
  margin-top: 0.5rem;
  /* align to right*/
  margin-left: auto;

}

/* ── In-Progress Notice ──────────────────────────────────────── */
.in-progress {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 2rem 0 1rem;
}

.in-progress .asterisk {
  font-size: 2rem;
}

.in-progress p {
  font-family: var(--font-title);
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  color: var(--teal);
  line-height: 1.4;
}

/* ── Home Page Specifics ─────────────────────────────────────── */
.home-hero .hero-text-col {
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 4vw, 3rem);
}

.home-hero .display-heading {
  color: var(--black);
  margin-bottom: 1.25rem;
  text-align: left;
}

.home-intro-body {
  font-size: 1rem;
  color: var(--black);
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.home-intro-body strong { font-weight: 700; }

.home-cta-links {
  margin-top: 1.2rem;
  font-size: 1rem;
  color: var(--black);
}

.home-cta-links a {
  color: var(--black);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.3s;
}

.home-cta-links a:hover { 
  color: var(--white); }

/* ── Medical Devices Hub ─────────────────────────────────────── */
.devices-hero {
  background: var(--teal);
  /* large padding like about me page */
  padding: var(--page-pad);
  text-align: left;
}

.devices-hero-inner {
  margin: 0 ;
  min-height: 20vh;
  align-items: center;
  display: flex;
  justify-content: center;
}

.devices-hero .display-heading {
  color: var(--black);
  font-size: clamp(2.8rem, 6vw, 4.5rem);

}

.chevron-down {
  text-align: center;
  padding: 1rem 0 0;
  font-size: 2rem;
  color: var(--black);
  cursor: default;
}

/* Figure + project list layout */
.devices-figure-section {
  padding: clamp(2rem, 4vw, 3rem) var(--page-pad);
  background: var(--white);
}

.devices-figure-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0rem;
  align-items: start;
}

.anatomical-figure {
  position: relative;
}

.anatomical-figure img {
  width: 50vw;
}

.anatomical-figure .img-placeholder {
  min-height: 600px;
  background: #e8e8e8;
}

/* ── Project dots ────────────────────────────────────────────
   Translucent red circles overlaid on the silhouette.
   Each .dot-N sets top/left as % of the image container.
   Tweak coordinates here; data-project attr is ready for
   JS hover/line/link wiring later.
   ─────────────────────────────────────────────────────────── */
.project-dot {
  position: absolute;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(74, 158, 142, 0.45);  /* teal, translucent */
  border: 1.5px solid var(--teal);
  transform: translate(-50%, -50%);       /* center on coordinate */
  pointer-events: none;                   /* inert for now */
  transition: background 0.2s, transform 0.2s;
}

/* Anatomical dot positions — (top, left) as % of .anatomical-figure */
/* 1. EEG Wheelchair  — head / brain */
.dot-1 { top: 5%;  left: 58%; }
/* 2. SnapVac         — throat / larynx */
.dot-2 { top: 16%; left: 55%; }
/* 3. HALO            — upper arm */
.dot-3 { top: 25%; left: 74%; }
/* 4. Dual Bandpass ECG — chest / heart */
.dot-4 { top: 30%; left: 60%; }
/* 5. ENdose          — abdomen / stomach */
.dot-5 { top: 38%; left: 53%; }
/* 6. Attachable Arm Stabilizer — elbow */
.dot-6 { top: 48%; left: 82%; }
/* 7. Active Slide Board — hips */
.dot-7 { top: 55%; left: 68%; }
/* 8. ComfyCane       — lower leg */
.dot-8 { top: 70%; left: 67%; }

.project-dot {
  cursor: pointer;
  pointer-events: auto; /* was: none */
}

.project-dot:hover,
.project-dot.dot-active {
  background: rgba(139, 26, 26, 0.35);   /* translucent crimson */
  border-color: var(--crimson);
  transform: translate(-50%, -50%) scale(1.7);
}

.project-hero-img {
  position: relative;
  overflow: hidden;
}

.project-hero-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.project-dot--large {
  width: 80px;
  height: 80px;
  border-width: 2px;
  transform: translate(-50%, -50%);
}

.project-dot--large:hover,
.project-dot--large.dot-active {
  background: rgba(139, 26, 26, 0.35);   /* translucent crimson */
  border-color: var(--crimson);
  transform: translate(-50%, -50%);
}

/* Project list on right side */
.project-list {
  padding-top: 1rem;
}

.project-list-item {
  /* two columns, one for date and one for name */
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
  padding: 3rem 1rem 0 0;
  border-bottom: 1.5px solid var(--crimson);
  cursor: pointer;
  transition: background 0.3s;
  overflow: hidden;
}

.project-date {
  font-family: var(--font-title);
  font-size: 0.8rem;
  color: var(--black);
  text-align: left;
  padding-left: 0.5rem;
  padding-top: 0.5rem;
  transition: color 0.3s;
}

.project-name {
  font-family: var(--font-title);
  font-size: 1.3rem;
  color: var(--black);
  text-align: right;
  transition: color 0.3s;
}

.project-summary {
  grid-column: 1 / -1;
  padding: 0.75rem 0 1rem 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--grey-dark);
  line-height: 1.65;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.35s ease, padding 0.35s ease;
  justify-content: right;
}

.project-list-item:hover .project-summary {
  max-height: 1000px;
  opacity: 1;
  padding-top: 0.75rem;
}

.project-date {
  font-family: var(--font-title);
  font-size: 0.8rem;
  color: var(--black);
  text-align: left;
  padding-left: 0.5rem;
  padding-top: 0.5rem;
  transition: color 0.3s;
}

.project-list-item:hover .project-name,
.project-list-item:hover .project-date {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.project-list-item.dot-hovered .project-name,
.project-list-item.dot-hovered .project-date {
  color: var(--teal);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.project-list-item.dot-hovered .project-summary {
  max-height: 1000px;
  opacity: 1;
  padding-top: 0.75rem;
}

/* ── About Page ──────────────────────────────────────────────── */
.about-hero .hero-image-col {
  min-height: 420px;
}

.about-body-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.personal-projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.personal-project-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.personal-project-card .project-card-title {
  font-family: var(--font-title);
  font-size: 0.9rem;
  text-align: center;
  color: var(--black);
}

.project-image-container {
  position: relative;
  overflow: hidden;
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
  padding: 1rem;
}

.project-image-container:hover .project-overlay {
  opacity: .85;
}

.project-overlay p {
  text-align: center;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--black);
  font-weight: 500;
}

.about-link:hover {
  color: var(--teal);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 0.3s;
}

.about-column-title {
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: normal;
  color: var(--black);
  margin-bottom: 0.75rem;
  padding-bottom: 0.1rem;
  border-bottom: 2px solid var(--teal);
  display: inline-block;
}

.about-body-grid > div {
  text-align: center;
}

.about-body-grid .prose {
  text-align: left;
}

/* ── Project Page Hero ───────────────────────────────────────── */
.project-hero-grid {
  display: grid;
  grid-template-columns: 50vw 1fr;
  background: var(--teal);
  min-height: 100vh;
  align-items: center;
}

.project-hero-img {
  aspect-ratio: 1 / 1;
}

.project-hero-img .img-placeholder {
  width: 100%;
  height: 100%;
  /* remove min-height and aspect-ratio */
}

.project-hero-text {
  padding:
    clamp(2rem, 4vw, 3.5rem)   /* top */
    clamp(1.5rem, 3vw, 2.5rem) /* right */
    clamp(.5rem, 1vw, 2rem)     /* bottom (smaller) */
    clamp(1.5rem, 3vw, 2.5rem) /* left */;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 1rem;
}

.project-hero-text .project-title {
  color: var(--black);
}

/* Red underline accent on project title */
.title-underline {
  display: block;
  width: 70%;
  height: 2px;
  background: var(--crimson);
  margin-top: 0.4rem;
}

/* ── Stub Page Notice ────────────────────────────────────────── */
.stub-notice {
  background: var(--grey-light);
  border-left: 4px solid var(--teal);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  font-size: 0.9rem;
  color: var(--grey-mid);
}

.stub-notice h3 {
  font-family: var(--font-title);
  font-weight: normal;
  font-size: 1.1rem;
  color: var(--grey-dark);
  margin-bottom: 0.4rem;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero-split,
  .project-hero-grid,
  .two-col,
  .about-body-grid,
  .contribution,
  .contribution.flip {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .hero-image-col { min-height: 260px; }

  .devices-figure-inner {
    grid-template-columns: 1fr;
  }

  .three-col,
  .features-grid,
  .personal-projects-grid {
    grid-template-columns: 1fr 1fr;
  }

  .project-list-item {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .project-name { text-align: left; }

  .project-hero-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .three-col,
  .features-grid,
  .personal-projects-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Research Flowchart ──────────────────────────────────────── */
.research-flowchart {
  width: 100%;
  overflow-x: auto;
  margin-top: 1.5rem;
}

.flowchart-grid {
  display: grid;
  grid-template-columns: 1fr 28px 1fr 28px 1fr 28px 1fr;
  grid-auto-rows: minmax(80px, auto);
  gap: 1rem;
  align-items: center;
  min-width: 640px;
}

.flowchart-spacer {
  min-height: 0;
}

.flowchart-header {
  font-family: var(--font-title);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
  background: var(--teal);
  padding: 0.6rem 0.9rem;
  text-align: center;
  border-radius: 2px 2px 0 0;
}

.flowchart-cells {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 8px;
}

.flowchart-cell {
  background: var(--white);
  border: 1px solid var(--border);
  border-left: 3px solid var(--teal);
  border-radius: 2px;
  padding: 0.7rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--grey-dark);
  min-height: 80px;
  display: flex;
  align-items: center;
}

.flowchart-arrow-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: calc(8px + 2.2rem); /* offset past header */
  gap: 8px;
}

.flowchart-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 80px;
  flex-shrink: 0;
}

.flowchart-arrow svg {
  width: 22px;
  height: 22px;
  color: var(--teal);
}

@media (max-width: 768px) {
  .research-flowchart {
    overflow-x: scroll;
    -webkit-overflow-scrolling: touch;
  }
}

/* -- New Grok Content -- */
/* ============================================================
   NEW VERTICAL STORY RAIL
   ============================================================ */

.story-container {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--page-pad);
  position: relative;
}

.vertical-rail {
  position: sticky;
  top: 80px;
  /* make height fill vertical viewport*/
  height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-self: start;
  border-right: 1px solid var(--black);
}

a.rail-link {
  font-family: var(--font-title);
  font-size: 0.95rem;
  line-height: 1.05;
  color: var(--black);
  text-decoration: none;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  transition: background 0.2s ease;
  padding: 4rem 0;
  position: relative;
  border-radius: 2px;
  display: inline-block;
}

.rail-link:hover {
  font-weight: 700;
  transition: font-weight 0.2s ease;
}

.rail-link.active {
  color: var(--black);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 1px;
}

.project-bullets {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
  font-family: var(--font-title);
  margin-bottom: 2rem;
  font-size: 1.2rem;
  padding-left: 2rem;
}

/* Content wrapper */
.story-content-wrapper {
  min-width: 0;
}

/* Individual sections */
.story-section {
  padding-bottom: 6rem;
  scroll-margin-top: 100px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.story-section.visible {
  opacity: 1;
  transform: translateY(0);
}

.story-section:last-child {
  padding-bottom: 4rem;
}

/* Make existing .section layout behave as single-column inside the story wrapper */
.story-content-wrapper .section {
  display: block;
  grid-template-columns: unset;
  padding: clamp(2rem, 5vw, 3.5rem) var(--page-pad);
}

/* Let the section-inner fill the content column (avoid additional centering) */
.story-content-wrapper .section-inner {
  max-width: none;
  margin: 0;
}

/* Rail link tweaks */
.rail-link {
  display: inline-block;
  text-decoration: none;
  padding: 2.25rem 0;
  cursor: pointer;
  color: var(--teal);
}

.rail-link:focus { outline: none; }

/* Mobile */
@media (max-width: 768px) {
  .story-container {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .vertical-rail {
    display: none;
  }

  .story-section {
    padding-bottom: 4rem;
  }
}