:root {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --ink: #14161a;
  --muted: #5d6573;
  --line: #d9deea;
  --blue: #2d65d8;
  --green: #217a57;
  --red: #c54555;
  --shadow: 0 18px 50px rgba(20, 22, 26, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(45, 101, 216, 0.07), rgba(33, 122, 87, 0.05) 52%, transparent),
    var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: inherit;
}

button,
textarea {
  font: inherit;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.top-nav {
  border-bottom: 1px solid rgba(217, 222, 234, 0.85);
  background: rgba(246, 247, 251, 0.82);
  backdrop-filter: blur(16px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 62px;
}

.brand-link,
.nav-links a {
  text-decoration: none;
}

.brand-link {
  color: var(--ink);
  font-weight: 720;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding: 4px 0;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.brand-link:hover,
.brand-link:focus-visible {
  color: var(--blue);
  outline: none;
}

.nav-links a[aria-current="page"] {
  color: var(--ink);
  border-color: currentColor;
}

.index-shell {
  padding: 56px 0 72px;
}

.site-header {
  max-width: 680px;
  margin-bottom: 28px;
}

.kicker,
.article-meta,
.source-note {
  color: var(--muted);
  font-size: 0.92rem;
}

.kicker {
  margin: 0 0 8px;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 0.98;
  font-weight: 760;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(1.35rem, 2vw, 1.85rem);
  line-height: 1.12;
}

.draft-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 18px;
}

.draft-card {
  display: grid;
  grid-template-columns: minmax(180px, 0.45fr) 1fr;
  min-height: 260px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.draft-card:hover,
.draft-card:focus-visible {
  border-color: rgba(45, 101, 216, 0.5);
  transform: translateY(-2px);
  outline: none;
}

.draft-visual {
  display: grid;
  place-items: center;
  gap: 14px;
  align-content: center;
  min-height: 220px;
  padding: 24px;
  border-right: 1px solid var(--line);
  background: #eef2f8;
}

.mini-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  width: min(100%, 176px);
  aspect-ratio: 1;
  overflow: hidden;
  border: 1px solid rgba(20, 22, 26, 0.22);
  border-radius: 6px;
  background: var(--panel);
}

.mini-board span {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: clamp(0.75rem, 2vw, 1.1rem);
  font-weight: 700;
}

.mini-board span:nth-child(16n + 1),
.mini-board span:nth-child(16n + 3),
.mini-board span:nth-child(16n + 5),
.mini-board span:nth-child(16n + 7),
.mini-board span:nth-child(16n + 10),
.mini-board span:nth-child(16n + 12),
.mini-board span:nth-child(16n + 14),
.mini-board span:nth-child(16n + 16) {
  background: #dbe3ef;
}

.mini-board span:nth-child(16n + 2),
.mini-board span:nth-child(16n + 4),
.mini-board span:nth-child(16n + 6),
.mini-board span:nth-child(16n + 8),
.mini-board span:nth-child(16n + 9),
.mini-board span:nth-child(16n + 11),
.mini-board span:nth-child(16n + 13),
.mini-board span:nth-child(16n + 15) {
  background: #ffffff;
}

.mini-board-large {
  width: min(100%, 220px);
}

.bit-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  max-width: 220px;
}

.bit-strip span {
  border-radius: 999px;
  background: rgba(45, 101, 216, 0.12);
  color: var(--blue);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
  line-height: 1;
  padding: 7px 9px;
}

.draft-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 30px;
}

.draft-copy time {
  color: var(--green);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.draft-copy h2 {
  margin-bottom: 10px;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
}

.draft-copy p {
  max-width: 56ch;
  color: var(--muted);
}

.article-shell {
  padding: 48px 0 80px;
}

.draft-article {
  display: grid;
  gap: 34px;
}

.article-header {
  display: grid;
  gap: 24px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.article-title-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px);
  gap: 28px;
  align-items: center;
}

.article-title-row p {
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.article-visual {
  display: grid;
  justify-items: center;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.language-tabs {
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: min(100%, 320px);
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.tab-button {
  min-height: 42px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.tab-button[aria-selected="true"] {
  background: var(--ink);
  color: #ffffff;
}

.tab-button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.article-body {
  max-width: 760px;
}

.article-body p,
.article-body li {
  color: #242832;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body h2 {
  margin-top: 40px;
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body ul {
  margin: 0 0 18px;
  padding-left: 1.3rem;
}

code {
  border-radius: 5px;
  background: rgba(45, 101, 216, 0.1);
  color: #1c4fa8;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.95em;
  padding: 0.1em 0.3em;
}

.implementation-lab {
  display: grid;
  gap: 18px;
  max-width: 920px;
  margin-top: 10px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.implementation-lab h2 {
  margin-bottom: 0;
}

.demo-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  color: var(--muted);
  font-size: 0.92rem;
}

textarea {
  width: 100%;
  min-height: 138px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.92rem;
  line-height: 1.45;
  padding: 12px;
}

textarea:focus {
  border-color: var(--blue);
  outline: 2px solid rgba(45, 101, 216, 0.18);
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 10px;
  grid-column: 1 / -1;
}

.action-button {
  min-height: 42px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  cursor: pointer;
  padding: 0 18px;
}

.action-button.secondary {
  border-color: var(--line);
  background: var(--panel);
  color: var(--ink);
}

.action-button:hover,
.action-button:focus-visible {
  border-color: var(--blue);
  outline: none;
}

.demo-status {
  min-height: 1.55em;
  margin: 0;
  color: var(--green);
}

.demo-status.is-error {
  color: var(--red);
}

.source-note {
  margin: 0;
}

.source-note a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

@media (max-width: 760px) {
  .index-shell {
    padding: 42px 0;
  }

  .draft-card,
  .article-title-row,
  .demo-grid {
    grid-template-columns: 1fr;
  }

  .draft-visual {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .draft-copy {
    padding: 24px;
  }

  .article-visual {
    justify-items: start;
  }

  .language-tabs {
    width: 100%;
  }
}

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