/* ===================================================================
   PORTFOLIO — styles.css
   Neobrutalist design system
   =================================================================== */

/* --- Custom Properties -------------------------------------------- */
:root {
  --cream:      #FAF6EE;
  --cream-alt:  #F0E8CC;
  --yellow:     #FFE234;
  --coral:      #FF5C5C;
  --teal:       #00C896;
  --blue:       #4cb2ec;
  --teal-pale:  #C8F5E6;
  --black:      #111111;
  --white:      #FFFFFF;
  --grey:       #E4DED2;

  --border:       2px solid var(--black);
  --shadow:       4px 4px 0 0 var(--black);
  --shadow-lg:    6px 6px 0 0 var(--black);
  --shadow-press: 1px 1px 0 0 var(--black);

  --font: 'Space Grotesk', 'Helvetica Neue', Arial, sans-serif;

  --nav-h: 56px;
  --max-w: 1100px;
  --pad:   clamp(1.25rem, 5vw, 2.5rem);

  --trans: 120ms ease;
}

/* --- Reset --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--cream);
  color: var(--black);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
select, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}
mark { background: none; }

/* --- Accessibility ------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--yellow);
  color: var(--black);
  font-weight: 700;
  padding: 0.5rem 1rem;
  border: var(--border);
  z-index: 9999;
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

/* --- Layout Utilities ---------------------------------------------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.section {
  padding: 4rem 0;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.section-num {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--black);
  opacity: 0.45;
  flex-shrink: 0;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.section-subtitle {
  font-size: 0.85rem;
  opacity: 0.55;
  margin-left: auto;
  font-weight: 500;
  align-self: center;
}

/* --- Buttons ------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.6rem 1.25rem;
  border: var(--border);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  background: var(--white);
  color: var(--black);
  box-shadow: var(--shadow);
  transition: box-shadow var(--trans), transform var(--trans);
  white-space: nowrap;
}
.btn:hover, .btn:focus-visible {
  box-shadow: var(--shadow-press);
  transform: translate(3px, 3px);
  outline: none;
}
.btn:focus-visible { outline: 3px solid var(--yellow); outline-offset: 2px; }

.btn-primary {
  background: var(--black);
  color: var(--white);
}

.btn-yellow {
  background: var(--yellow);
}

/* --- Tags / Badges ------------------------------------------------- */
.tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border: var(--border);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  background: var(--white);
}

/* ===================================================================
   NAVIGATION
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--cream);
  border-bottom: var(--border);
}

.nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.nav-brand {
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 2rem);
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  opacity: 0.6;
  transition: opacity var(--trans);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  opacity: 1;
  border-bottom-color: var(--black);
}

.nav-cta {
  font-size: 0.75rem;
  padding: 0.45rem 1rem;
}

/* Hamburger (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  transition: transform var(--trans), opacity var(--trans);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===================================================================
   HERO SECTION
   =================================================================== */
.hero-section {
  background: var(--white);
  padding: 3rem 0 4rem;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: start;
  margin-bottom: 3rem;
}

.hero-headline {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  max-width: 700px;
}

.hero-mark {
  background: var(--yellow);
  padding: 2px 10px;
  display: inline;
  line-height: inherit;
  font-style: normal;
}

.hero-em {
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
  font-style: normal;
}

.hero-card {
  width: 200px;
  min-height: 120px;
  background: var(--coral);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 1rem;
  flex-shrink: 0;
  margin-top: 0.5rem;
}

.hero-card p {
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--black);
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: var(--border);
}

.stat-box {
  padding: 1.25rem 1.5rem;
  border-right: var(--border);
}

.stat-box:last-child { border-right: none; }

.stat-value {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  display: block;
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.55;
}

/* ===================================================================
   ABOUT SECTION
   =================================================================== */
.about-section {
  background: var(--cream);
  border-top: var(--border);
  border-bottom: var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  align-items: start;
}

.about-intro {
  font-size: 1.125rem;
  font-weight: 500;
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.about-intro strong {
  font-weight: 800;
  background: var(--yellow);
  padding: 0 4px;
}

.about-body p {
  font-size: 0.95rem;
  opacity: 0.75;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.about-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.about-skills .tag {
  background: var(--white);
}

/* Profile card */
.about-card {
  border: var(--border);
  box-shadow: var(--shadow-lg);
  background: var(--white);
  overflow: hidden;
}

.profile-avatar {
  background: var(--teal);
  border-bottom: var(--border);
  height: 170px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile-initials {
  font-size: 4.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--black);
}

.profile-info {
  padding: 1.25rem;
}

.profile-name {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 0.2rem;
}

.profile-role {
  font-size: 0.75rem;
  font-weight: 500;
  opacity: 0.55;
  margin-bottom: 1rem;
}

.profile-field {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  border: var(--border);
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--cream);
}

.profile-field-icon {
  color: #0a66c2;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.profile-email-link {
  text-decoration: none;
  color: inherit;
}
.profile-email-link:hover { text-decoration: underline; }

/* ===================================================================
   CASE STUDIES SECTION
   =================================================================== */
.case-studies-section {
  background: var(--grey);
}

.case-study-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  border: var(--border);
  box-shadow: var(--shadow-lg);
  margin-bottom: 1.5rem;
  background: var(--white);
  transition: box-shadow var(--trans), transform var(--trans);
}

.case-study-card:hover {
  box-shadow: var(--shadow-press);
  transform: translate(5px, 5px);
}

/* Coloured number panel */
.cs-panel {
  position: relative;
  padding: 1.5rem;
  border-right: var(--border);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 260px;
}

.cs-panel--yellow { background: var(--yellow); }
.cs-panel--coral  { background: var(--coral);  }
.cs-panel--teal   { background: var(--teal);   }
.cs-panel--blue   { background: var(--blue);   }

.cs-label {
  position: absolute;
  top: 1rem;
  left: 1rem;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
}

.cs-number {
  font-size: clamp(5rem, 10vw, 8rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--black);
}

/* Case study content */
.cs-content {
  padding: 1.75rem 2rem;
  display: flex;
  flex-direction: column;
}

.cs-year {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.45;
  margin-bottom: 0.5rem;
}

.cs-title {
  font-size: clamp(1.4rem, 2.5vw, 1.85rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  line-height: 1.15;
}

.cs-description {
  font-size: 0.9rem;
  opacity: 0.7;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.cs-stats {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.cs-stat {
  border: var(--border);
  padding: 0.5rem 0.85rem;
  min-width: 80px;
}

.cs-stat-value {
  display: block;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.cs-stat--yellow { background: var(--yellow); }
.cs-stat--coral  { background: var(--coral);  }
.cs-stat--teal   { background: var(--teal);   }
.cs-stat--blue   { background: var(--blue);   }

.cs-stat-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  opacity: 0.6;
}

.cs-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.cs-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* ===================================================================
   OTHER PROJECTS SECTION
   =================================================================== */
.projects-section {
  background-color: var(--cream);
  border-top: var(--border);
}

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

.project-card {
  border: var(--border);
  box-shadow: var(--shadow);
  background: var(--white);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: box-shadow var(--trans), transform var(--trans);
}

.project-card:hover {
  box-shadow: var(--shadow-press);
  transform: translate(3px, 3px);
}

.project-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.project-icon {
  min-width: 36px;
  height: 36px;
  border: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  flex-shrink: 0;
  padding: 1rem
}

.project-icon--yellow { background: var(--yellow); }
.project-icon--coral  { background: var(--coral);  }
.project-icon--teal   { background: var(--teal);   }
.project-icon--blue   { background: var(--blue);   }

.project-ext-link {
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  opacity: 0.4;
  transition: opacity var(--trans);
  flex-shrink: 0;
  padding: 2px 6px;
  border: 1px solid transparent;
}

.project-ext-link:hover { opacity: 1; border-color: var(--black); }

.project-title {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.project-description {
  font-size: 0.8rem;
  opacity: 0.65;
  line-height: 1.55;
  flex: 1;
}

.project-tags {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: auto;
}

/* GitHub banner */
.github-banner {
  border: var(--border);
  background: var(--black);
  color: var(--white);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.github-banner-title {
  font-size: 1rem;
  font-weight: 800;
}

.github-banner-sub {
  font-size: 0.8rem;
  opacity: 0.55;
  margin-top: 0.25rem;
}

.github-banner .btn {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--black);
  box-shadow: none;
  flex-shrink: 0;
}

.github-banner .btn:hover {
  background: var(--white);
  border-color: var(--white);
  transform: none;
  box-shadow: none;
}

/* ===================================================================
   CONTACT SECTION
   =================================================================== */
.contact-section {
  background: var(--teal-pale);
  border-top: var(--border);
  border-bottom: var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: start;
}

.contact-handle {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: 1rem;
}

.contact-headline {
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.contact-accent {
  color: var(--black);
  background: var(--coral);
  padding: 0 6px;
  display: inline;
}

.contact-email {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  word-break: break-all;
}

.contact-availability {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-availability li {
  font-size: 0.8rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.contact-availability li::before {
  content: '✓';
  font-weight: 700;
  color: var(--black);
  flex-shrink: 0;
  margin-top: 1px;
}

/* Form */
.contact-form-wrapper {
  background: var(--white);
  border: var(--border);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.form-group label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.65rem 0.85rem;
  border: var(--border);
  background: var(--cream);
  font-size: 0.875rem;
  outline: none;
  transition: box-shadow var(--trans);
  appearance: none;
  -webkit-appearance: none;
  border-radius: 0;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M0 0l6 8 6-8z' fill='%23111'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.85rem center;
  padding-right: 2.5rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  box-shadow: var(--shadow);
}

.form-group input[aria-invalid="true"],
.form-group textarea[aria-invalid="true"] {
  border-color: var(--coral);
  box-shadow: 3px 3px 0 0 var(--coral);
}

.form-group textarea { resize: vertical; min-height: 100px; }

.form-status {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.6rem 0;
  min-height: 2rem;
}

.form-status.success { color: #00875A; }
.form-status.error   { color: var(--coral); }

.form-group .field-error {
  font-size: 0.72rem;
  color: var(--coral);
  font-weight: 600;
}

/* ===================================================================
   FOOTER
   =================================================================== */
.footer {
  background: var(--black);
  color: var(--white);
  border-top: var(--border);
}

.footer-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem var(--pad);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-line1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.footer-line2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--yellow);
}

.footer-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-shrink: 0;
}

.footer-socials {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.footer-social-link {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--white);
  opacity: 0.5;
  transition: opacity var(--trans);
}

.footer-social-link:hover { opacity: 1; }

.back-to-top {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.3);
  padding: 0.5rem 1rem;
  transition: border-color var(--trans), color var(--trans);
}

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

.footer-divider {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.12);
  margin: 0 var(--pad);
}

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.25rem var(--pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copyright,
.footer-version {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  opacity: 0.4;
  text-transform: uppercase;
}

/* footer-version doubles as a link back to the main site on sub-pages */
a.footer-version {
  color: inherit;
  text-decoration: none;
}

/* Honeypot field — hidden from real users, bots fill it in.
   Kept as a class (not inline style) so it works under a strict CSP. */
.honeypot-field {
  display: none;
}

/* ===================================================================
   CASE STUDY PAGE
   =================================================================== */
.cs-page-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--trans);
  margin-bottom: 2.5rem;
}

.cs-page-back:hover { border-bottom-color: var(--black); }

.cs-page-hero {
  display: grid;
  grid-template-columns: 300px 1fr;
  border: var(--border);
  box-shadow: var(--shadow-lg);
  margin-bottom: 3rem;
  background: var(--white);
}

.cs-page-panel {
  position: relative;
  padding: 2rem;
  border-right: var(--border);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 300px;
}

.cs-page-panel--yellow { background: var(--yellow); }
.cs-page-panel--coral  { background: var(--coral);  }
.cs-page-panel--teal   { background: var(--teal);   }
.cs-page-panel--blue   { background: var(--blue);   }

.cs-page-number {
  font-size: clamp(6rem, 12vw, 10rem);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
}

.cs-page-info {
  padding: 2.5rem;
}

.cs-page-meta {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.45;
  margin-bottom: 0.75rem;
}

.cs-page-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1rem;
}

.cs-page-desc {
  font-size: 1rem;
  opacity: 0.7;
  line-height: 1.65;
  margin-bottom: 2rem;
}

.cs-page-stats {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.cs-page-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

/* Content sections */
.cs-content-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.cs-content-block {
  border: var(--border);
  padding: 1.75rem;
  background: var(--white);
  box-shadow: var(--shadow);
}

.cs-content-block h3 {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.85rem;
  opacity: 0.5;
}

.cs-content-block p,
.cs-content-block div {
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(17, 17, 17, 0.8);
}

.cs-content-block ol {
  margin: 0.75rem 0 0 1.25rem;
  padding: 0;
  display: grid;
  gap: 0.45rem;
}

.cs-content-block li {
  line-height: 1.7;
  color: rgba(17, 17, 17, 0.8);
}

/* Prev/next navigation between case studies */
.cs-nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* Hidden by default; case-study.js adds .is-visible only when a
   prev/next case study actually exists (first/last study has no sibling). */
#cs-prev,
#cs-next {
  display: none;
}

#cs-prev.is-visible,
#cs-next.is-visible {
  display: inline-flex;
}

/* Not found state */
.not-found {
  text-align: center;
  padding: 6rem var(--pad);
}

.not-found h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.not-found p {
  opacity: 0.6;
  margin-bottom: 2rem;
}

/* ===================================================================
   RESPONSIVE
   =================================================================== */
@media (max-width: 900px) {
  .nav-links { display: none; }
 

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--cream);
    border-bottom: var(--border);
    padding: 1.5rem var(--pad);
    gap: 1.25rem;
    z-index: 190;
  }

  .nav-links.open a {
    font-size: 1rem;
    opacity: 1;
    border-bottom: none;
    padding: 0.25rem 0;
  }

  .nav-toggle { display: flex; }

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

  .hero-card {
    width: 100%;
    min-height: 60px;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-row .stat-box:nth-child(2) { border-right: none; }
  .stats-row .stat-box:nth-child(3) { border-top: var(--border); }
  .stats-row .stat-box:nth-child(4) { border-top: var(--border); border-right: none; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .about-card {
    border-bottom: var(--border);
    min-height: 160px;
    justify-content: flex-start;
  }

  .case-study-card {
    grid-template-columns: 1fr;
  }

  .cs-panel {
    border-right: none;
    border-bottom: var(--border);
    min-height: 160px;
    justify-content: flex-start;
    padding-top: 2rem;
  }

  .cs-number {
    font-size: 5rem;
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

  .cs-page-panel {
    border-right: none;
    border-bottom: var(--border);
    min-height: 200px;
  }

  .cs-content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-main {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-subtitle { display: none; }

  .github-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* --- Reduced motion ------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* --- Focus visible ------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 2px;
}