/* variables */
:root {
  --bg:      #f6f6f4;
  --panel:   #fff;
  --ink:     #141414;
  --muted:   #5a5a5a;
  --line:    rgba(20, 20, 20, .12);
  --line2:   rgba(20, 20, 20, .2);
  --r:       6px;
  --s3:      1rem;
  --s4:      1.5rem;
  --s5:      2.25rem;
  --shadow:  0 10px 30px rgba(0, 0, 0, .06);
  --max:     1120px;
}

/* reset & base */
html {
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  margin:      0;
  background:  var(--bg);
  color:       var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.45;
  opacity:     0;
  animation:   fadeIn .6s forwards;
}

@keyframes fadeIn {
  to { opacity: 1; }
}

a {
  color:           inherit;
  text-decoration: none;
}

a:hover {
  text-decoration:        underline;
  text-underline-offset:  4px;
}

.wrap {
  max-width: var(--max);
  margin:    0 auto;
  padding:   0 var(--s4);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

main {
  padding-top: 65px;
}

/* navbar */
.topbar {
  position:                fixed;
  top:                     0;
  left:                    0;
  right:                   0;
  z-index:                 50;
  background:              rgba(246, 246, 244, .1);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter:         blur(10px);
  border-bottom:           1px solid var(--line);
  box-shadow:              0 2px 8px rgba(0, 0, 0, .06);
}

.topbar.scrolled {
  background:              var(--bg);
  backdrop-filter:         none;
  -webkit-backdrop-filter: none;
}

.topbar-inner {
  display:         flex;
  align-items:     center;
  justify-content: space-between;
  padding:         14px 0;
  gap:             var(--s4);
}

.brand {
  display:      flex;
  align-items:  center;
  gap:          10px;
  white-space:  nowrap;
}

.brand-logo {
  height:     30px;
  display:    block;
  transition: filter .3s;
}

.topbar.scrolled .brand-logo {
  filter: invert(1);
}

/* navbar white text over hero */
.topbar .brand strong, .topbar nav ul,
.topbar nav a, .topbar .btn:not(.primary) {
  color:      #fff;
  transition: color .3s;
}

.topbar nav a.active {
  color:                 #fff;
  text-decoration:       underline;
  text-underline-offset: 6px;
}

/* dark navbar text when scrolled */
.topbar.scrolled .brand strong,
.topbar.scrolled nav ul, .topbar.scrolled nav a,
.topbar.scrolled .btn:not(.primary), .topbar.scrolled nav a.active {
  color: var(--ink);
}

/* dark navbar text when mobile menu open */
.topbar.nav-open .brand strong {
  color: var(--ink) !important;
}

.topbar.nav-open .brand-logo {
  filter: invert(1);
}

nav ul {
  display:     flex;
  gap:         18px;
  list-style:  none;
  padding:     0;
  margin:      0;
  align-items: center;
  font-size:   0.875rem;
}

nav a {
  padding: 8px 0;
  display: inline-block;
}

/* buttons */
.actions {
  display:     flex;
  gap:         10px;
  align-items: center;
  flex-wrap:   wrap;
}

.btn {
  display:         inline-flex;
  align-items:     center;
  justify-content: center;
  height:          36px;
  padding:         0 14px;
  border:          1px solid var(--line2);
  background:      var(--panel);
  border-radius:   var(--r);
  font-size:       0.8rem;
}

.btn.primary {
  background:   var(--ink);
  color:        var(--panel);
  border-color: var(--ink);
}

.btn:focus {
  outline:        2px solid rgba(31, 42, 68, .35);
  outline-offset: 2px;
}

/* typography */
.kicker {
  font-size:      0.75rem;
  text-transform: uppercase;
  letter-spacing: .18em;
  color:          var(--muted);
}

h1 {
  margin:         10px 0 12px;
  font-size:      clamp(1.75rem, 3vw, 2.5rem);
  line-height:    1.05;
  letter-spacing: -.6px;
}

.sub {
  color:      var(--muted);
  margin:     0 0 var(--s3);
  max-width:  60ch;
  font-size:  0.95rem;
  min-height: 1.5em;
}

.sub::after {
  content:   '|';
  margin-left: 2px;
  animation: blink .7s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* reusable panel */
.panel {
  background:    var(--panel);
  border:        1px solid var(--line);
  border-radius: var(--r);
  box-shadow:    var(--shadow);
  padding:       var(--s4);
}

.panel-title {
  margin:    0 0 10px;
  font-size: 1.125rem;
}

.panel-body {
  margin:    0;
  color:     var(--muted);
  font-size: 0.95rem;
  max-width: 80ch;
}

/* reusable tags */
.tag {
  font-size:     0.75rem;
  color:         var(--muted);
  border:        1px solid var(--line);
  padding:       5px 9px;
  border-radius: var(--r);
  background:    rgba(246, 246, 244, .6);
}

.tagrow {
  display:    flex;
  flex-wrap:  wrap;
  gap:        8px;
  margin-top: 8px;
}

.tagrow-spaced {
  margin-top: 14px;
}

.skills-label {
  font-size:      0.7rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color:          var(--muted);
  background:     none;
  border-color:   transparent;
  padding-left:   0;
  pointer-events: none;
}

.mt-12 {
  margin-top: 12px;
}

.mt-20 {
  margin-top: 20px;
}

/* reusable links & arrows */
.link, .story-link, .back-link {
  display:     inline-flex;
  align-items: center;
  gap:         6px;
  color:       var(--ink);
}

.arrow {
  width:        10px;
  height:       10px;
  border-right: 2px solid var(--ink);
  border-top:   2px solid var(--ink);
  transform:    rotate(45deg);
  opacity:      .85;
}

.story-link .arrow {
  width:  8px;
  height: 8px;
}

/* reusable badges */
.shipped-badge {
  display:        inline-block;
  font-size:      0.65rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  background:     var(--ink);
  color:          var(--panel);
  padding:        3px 8px;
  border-radius:  var(--r);
  margin-left:    8px;
  vertical-align: middle;
}

.back-link {
  margin-top:    var(--s4);
  margin-bottom: var(--s5);
}

/* reusable breadcrumbs */
.crumbs {
  color:     var(--muted);
  font-size: 0.8rem;
}

.crumbs a {
  color: var(--muted);
}

/* footer */
footer.site-footer {
  border-top: 1px solid var(--line);
  padding:    24px 0 40px;
  color:      var(--muted);
  font-size:  0.8rem;
}

.foot {
  display:         flex;
  align-items:     center;
  justify-content: space-between;
  gap:             12px;
  flex-wrap:       wrap;
}

.foot-mid {
  text-align: center;
}

.foot a {
  color: var(--muted);
}

.foot-logo {
  height:  30px;
  opacity: .4;
}

.foot a img.foot-logo {
  filter:     brightness(0);
  transition: filter .2s;
}

/* convert white to linkedin blue on hover, don't look too closely... */
.foot a:hover img.foot-logo {
  filter: invert(29%) sepia(98%) saturate(1000%) hue-rotate(183deg) brightness(90%) contrast(101%);
}

/* hamburger */
.hamburger {
  display:        none;
  background:     none;
  border:         none;
  cursor:         pointer;
  padding:        6px;
  flex-direction: column;
  gap:            5px;
  position:       relative;
  z-index:        200;
}

.hamburger span {
  display:       block;
  width:         22px;
  height:        2px;
  background:    #fff;
  border-radius: 2px;
  transition:    transform .3s, opacity .3s, background .3s;
}

.topbar.scrolled .hamburger span,
.topbar.nav-open .hamburger span {
  background: var(--ink);
}

.topbar.nav-open .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.topbar.nav-open .hamburger span:nth-child(2) {
  opacity: 0;
}

.topbar.nav-open .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* mobile overlay */
.mobile-overlay {
  display:         none;
  position:        fixed;
  inset:           0;
  background:      var(--bg);
  z-index:         150;
  flex-direction:  column;
  align-items:     center;
  justify-content: center;
  gap:             10px;
}

.mobile-overlay.open {
  display: flex;
}

.mobile-overlay a {
  color:           var(--ink) !important;
  font-size:       1.25rem;
  padding:         10px 0;
  text-decoration: none;
}

.mobile-overlay .mobile-actions {
  display:    flex;
  gap:        10px;
  margin-top: 20px;
}

.mobile-overlay .mobile-actions .btn {
  color:     var(--ink);
  font-size: 0.8rem;
  padding:   0 20px;
}

.mobile-overlay .mobile-actions .btn.primary {
  color: var(--panel) !important;
}

/* responsive mobile */
@media (max-width: 640px) {
  .hamburger {
    display: flex;
  }

  .topbar nav, .topbar .actions {
    display: none;
  }

  .topbar .wrap {
    margin-left:  20px;
    margin-right: 20px;
  }

  .topbar.nav-open {
    z-index: 160;
  }
}