/* =========================================================
   Open Source Starter Kit
   Colors and shapes follow the Google Developer Groups style:
   Google's four colors, soft pastel fills, and black outlines.
   ========================================================= */

:root {
  /* Google colors */
  --blue: #4285f4;
  --red: #ea4335;
  --yellow: #fbbc04;
  --green: #34a853;

  /* Pastel fills */
  --blue-soft: #c3ecf6;
  --red-soft: #f8d8d8;
  --yellow-soft: #ffe7a5;
  --green-soft: #ccf6c5;

  /* Base */
  --ink: #000000;
  --muted: #444746;
  --paper: #ffffff;
  --line: 2px solid var(--ink);

  /* Type */
  --font: "Google Sans", "Google Sans Text", "Product Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Google Sans Code", "Google Sans Mono", "JetBrains Mono", ui-monospace, Consolas, monospace;

  /* Layout */
  --page: 68rem;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  z-index: 10;
}
.skip-link:focus {
  left: 0.5rem;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: var(--line);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.125rem;
  text-decoration: none;
}

.brand-dots {
  display: inline-flex;
  gap: 4px;
}

.brand-dots i {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--ink);
}
.brand-dots i:nth-child(1) { background: var(--blue); }
.brand-dots i:nth-child(2) { background: var(--red); }
.brand-dots i:nth-child(3) { background: var(--yellow); }
.brand-dots i:nth-child(4) { background: var(--green); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.25rem;
  font-size: 1rem;
}

.site-nav a {
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 3px solid transparent;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-bottom-color: var(--ink);
}

.site-nav .nav-cta {
  padding: 0.35rem 1rem;
  border: var(--line);
  border-radius: 999px;
  background: var(--green-soft);
}
.site-nav .nav-cta:hover {
  background: var(--green);
  color: var(--paper);
  border-bottom-color: var(--ink);
}

/* ---------- Buttons ---------- */

.button {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border: var(--line);
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  background: var(--paper);
}
.button:hover {
  background: var(--yellow-soft);
}
.button.primary {
  background: var(--ink);
  color: var(--paper);
}
.button.primary:hover {
  background: var(--blue);
}

/* ---------- Home: hero ---------- */

.hero {
  padding: clamp(3rem, 8vw, 6rem) 0 2.5rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.75rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  max-width: 14ch;
}

.hero p {
  font-size: clamp(1.125rem, 2vw, 1.3rem);
  max-width: 38rem;
  margin: 0 0 2rem;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Home: contribution journey ---------- */

.journey {
  padding: 1rem 0 3.5rem;
}

.journey-scroll {
  overflow-x: auto;
  scrollbar-width: thin;
}

.journey-track {
  list-style: none;
  margin: 0;
  padding: 1.75rem 0 0.75rem;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  min-width: 46rem;
  position: relative;
}

/* the line connecting all steps, from the first dot to the last */
.journey-track::before {
  content: "";
  position: absolute;
  top: calc(1.75rem + 1.5rem - 1.5px);
  left: calc(100% / 18);
  right: calc(100% / 18);
  height: 3px;
  background: var(--ink);
}

.journey-track li {
  display: flex;
  justify-content: center;
}

.journey-track a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  text-align: center;
  position: relative;
}

.journey-dot {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 3px solid var(--ink);
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--paper);
  transition: transform 0.15s ease;
}

.journey-track li:nth-child(4n + 1) .journey-dot { background: var(--blue); }
.journey-track li:nth-child(4n + 2) .journey-dot { background: var(--red); }
.journey-track li:nth-child(4n + 3) .journey-dot { background: var(--yellow); color: var(--ink); }
.journey-track li:nth-child(4n + 4) .journey-dot { background: var(--green); }

.journey-track a:hover .journey-dot,
.journey-track a:focus-visible .journey-dot {
  transform: scale(1.12);
}

.journey-caption {
  color: var(--muted);
  font-size: 1rem;
  margin: 0.75rem 0 0;
}

/* One orchestrated moment: the steps light up in order on page load */
@media (prefers-reduced-motion: no-preference) {
  .journey-track li {
    animation: step-in 0.4s ease both;
  }
  .journey-track li:nth-child(1) { animation-delay: 0.05s; }
  .journey-track li:nth-child(2) { animation-delay: 0.15s; }
  .journey-track li:nth-child(3) { animation-delay: 0.25s; }
  .journey-track li:nth-child(4) { animation-delay: 0.35s; }
  .journey-track li:nth-child(5) { animation-delay: 0.45s; }
  .journey-track li:nth-child(6) { animation-delay: 0.55s; }
  .journey-track li:nth-child(7) { animation-delay: 0.65s; }
  .journey-track li:nth-child(8) { animation-delay: 0.75s; }
  .journey-track li:nth-child(9) { animation-delay: 0.85s; }
}

@keyframes step-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Sections ---------- */

.section {
  padding: 3.5rem 0;
  border-top: var(--line);
}

.section h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: 1.1;
  margin: 0 0 1.5rem;
}

.section-intro {
  max-width: 40rem;
  color: var(--muted);
  margin: -0.75rem 0 2rem;
}

/* What's inside: three doors into the site */
.doors {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.25rem;
}

.door {
  display: block;
  padding: 1.5rem;
  border: var(--line);
  border-radius: 1.25rem;
  text-decoration: none;
}
.door:hover {
  box-shadow: 6px 6px 0 var(--ink);
}
.door h3 {
  margin: 0 0 0.4rem;
  font-size: 1.4rem;
}
.door p {
  margin: 0;
}
.door.blue { background: var(--blue-soft); }
.door.yellow { background: var(--yellow-soft); }
.door.green { background: var(--green-soft); }

/* How to contribute: a real sequence, so it is numbered */
.steps {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  max-width: 44rem;
}

.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  align-items: start;
}

.steps li::before {
  content: counter(step);
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: var(--line);
  display: grid;
  place-items: center;
  font-weight: 700;
  background: var(--yellow-soft);
}

.steps strong {
  display: block;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--blue-soft);
  padding: 0.1em 0.35em;
  border-radius: 6px;
}

/* ---------- Inner pages ---------- */

.page-head {
  padding: 3rem 0 1.5rem;
}

.page-head h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.05;
  margin: 0 0 0.75rem;
}

.page-head p {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
}

.page-body {
  padding-bottom: 4rem;
}

.notice {
  border: var(--line);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--red-soft);
  max-width: 44rem;
}
.notice p {
  margin: 0 0 0.5rem;
}
.notice p:last-child {
  margin-bottom: 0;
}

/* Search box */
.search {
  margin: 0 0 2rem;
  max-width: 28rem;
}
.search label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.search input {
  width: 100%;
  font: inherit;
  padding: 0.65rem 1rem;
  border: var(--line);
  border-radius: 999px;
}

/* Glossary */
.terms {
  display: grid;
  gap: 1rem;
  margin: 0;
}

.term {
  border: var(--line);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  scroll-margin-top: 1rem;
}
.term:target {
  background: var(--yellow-soft);
}
.term dt {
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 0.25rem;
}
.term dd {
  margin: 0;
  max-width: 44rem;
}
.term .example {
  margin-top: 0.75rem;
}

/* Cheat sheet */
.sheet {
  display: grid;
  gap: 2.5rem;
}

.sheet-section h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.sheet-section h2::before {
  content: "";
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  border: var(--line);
  flex: none;
  margin-top: 0.3em;
}
.sheet-section:nth-child(4n + 1) h2::before { background: var(--blue); }
.sheet-section:nth-child(4n + 2) h2::before { background: var(--red); }
.sheet-section:nth-child(4n + 3) h2::before { background: var(--yellow); }
.sheet-section:nth-child(4n + 4) h2::before { background: var(--green); }

.commands {
  border: var(--line);
  border-radius: 1rem;
  overflow: hidden;
}

.command {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 0.5rem 1.5rem;
  padding: 0.9rem 1.25rem;
  align-items: center;
}
.command + .command {
  border-top: 1px solid var(--ink);
}
.command pre {
  margin: 0;
  overflow-x: auto;
}
.command code {
  background: none;
  padding: 0;
  font-size: 0.95rem;
}
.command p {
  margin: 0;
}

/* Resources */
.resource-group + .resource-group {
  margin-top: 2.5rem;
}
.resource-group h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
}

.resources {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 1rem;
}

.resource {
  border: var(--line);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.resource a {
  font-weight: 700;
  font-size: 1.15rem;
}
.resource p {
  margin: 0;
  flex: 1;
}

.pill {
  align-self: flex-start;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.15rem 0.7rem;
  border: 1.5px solid var(--ink);
  border-radius: 999px;
}
.pill.beginner { background: var(--green-soft); }
.pill.intermediate { background: var(--yellow-soft); }

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

/* ---------- Footer ---------- */

.site-footer {
  border-top: var(--line);
  padding: 2rem 0 3rem;
  font-size: 1rem;
  color: var(--muted);
}
.site-footer p {
  margin: 0 0 0.5rem;
}
.contributors {
  margin-top: 1.5rem;
}

/* ---------- Small screens ---------- */

@media (max-width: 640px) {
  .command {
    grid-template-columns: 1fr;
  }
}

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