/* Blog styles. Tokens, nav, and footer mirror the inline styles in /index.html. */
:root {
  --bg: #ffffff;
  --bg-alt: #f4f8f8;
  --text: #0b1f33;
  --text-2: #3a4a59;
  --text-3: #54606a;
  --line: #e3eded;
  --line-2: #c8d5df;
  --accent: #0f7f78;
  --accent-hover: #0b6a64;
  --tide: #7fd6ce;
  --star: #f2b655;
  --midnight: #0b1f33;
  --pos: #0b6a64;
  --maxw: 1120px;
  --readw: 68ch;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family:
    Manrope,
    system-ui,
    -apple-system,
    sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

h1,
h2,
h3 {
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}
h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  font-weight: 800;
}
.sub {
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  color: var(--text-2);
  max-width: 58ch;
}
.kicker {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
  transition:
    background 0.13s ease,
    border-color 0.13s ease;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
}
.btn-ghost {
  border-color: var(--text);
  color: var(--text);
  background: #fff;
}
.btn-ghost:hover {
  background: var(--bg-alt);
}
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
  font-size: 18px;
  letter-spacing: -0.04em;
  color: var(--accent);
  text-decoration: none;
}
.brand-mark {
  width: 22px;
  height: 22px;
  flex: none;
}
.brand-name b {
  font-weight: 800;
  color: var(--text);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}
.nav-links a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}
.nav-drop {
  position: relative;
}
.nav-drop-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: none;
  border: 0;
  padding: 0;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: inherit;
  color: var(--text-2);
  cursor: pointer;
  white-space: nowrap;
}
.nav-drop-btn svg {
  width: 10px;
  height: 10px;
  transition: transform 0.13s ease;
}
.nav-drop:hover .nav-drop-btn,
.nav-drop.open .nav-drop-btn,
.nav-drop-btn.current {
  color: var(--text);
}
.nav-drop:hover .nav-drop-btn svg,
.nav-drop.open .nav-drop-btn svg {
  transform: rotate(180deg);
}
.nav-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  padding-top: 10px;
  z-index: 60;
}
.nav-drop:hover .nav-menu,
.nav-drop.open .nav-menu {
  display: block;
}
.nav-menu-in {
  min-width: 168px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(11, 31, 51, 0.08);
  padding: 6px;
}
.nav-links .nav-menu a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text);
}
.nav-links .nav-menu a:hover,
.nav-links .nav-menu a[aria-current="page"] {
  background: var(--bg-alt);
}
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  margin-right: -8px;
  background: none;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
.nav-burger span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 1px;
  background: var(--text);
  transition:
    transform 0.15s ease,
    opacity 0.15s ease;
}
.nav.open .nav-burger span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav.open .nav-burger span:nth-child(2) {
  opacity: 0;
}
.nav.open .nav-burger span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}
.nav-burger:focus-visible,
.nav-drop-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* page header */
.page-head {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--line);
}
.page-head .kicker {
  display: block;
  margin-bottom: 16px;
}
.page-head h1 {
  max-width: 22ch;
  margin-bottom: 18px;
}

/* post list */
.posts {
  list-style: none;
  padding: 24px 0 56px;
}
.post-row {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 36px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.post-row:first-child {
  border-top: none;
}
.post-date {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--text-3);
  padding-top: 4px;
}
.post-row h2 {
  font-size: 1.12rem;
  margin-bottom: 8px;
}
.post-row h2 a {
  color: var(--text);
  text-decoration: none;
}
.post-row h2 a:hover {
  color: var(--accent);
}
.post-row p {
  color: var(--text-2);
  font-size: 15px;
  max-width: 64ch;
}
.empty {
  color: var(--text-3);
  font-size: 15px;
  padding: 28px 0 56px;
}

/* article */
.article-head {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--line);
}
.article-head .back {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 20px;
}
.article-head .back:hover {
  color: var(--accent);
}
.article-head h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  max-width: 24ch;
  margin-bottom: 16px;
}
.article-meta {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--text-3);
}
.prose {
  max-width: var(--readw);
  padding: 40px 0 64px;
}
.prose > * + * {
  margin-top: 18px;
}
.prose h2 {
  font-size: clamp(1.25rem, 2.4vw, 1.5rem);
  margin-top: 40px;
}
.prose h3 {
  font-size: 1.12rem;
  margin-top: 28px;
}
.prose p,
.prose li {
  color: var(--text-2);
}
.prose a {
  color: var(--accent);
}
.prose ul,
.prose ol {
  padding-left: 22px;
}
.prose li + li {
  margin-top: 6px;
}
.prose blockquote {
  border-left: 2px solid var(--line);
  padding-left: 18px;
  color: var(--text-2);
}
.prose code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.86em;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 4px;
}
.prose pre {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  line-height: 1.78;
  color: var(--text-2);
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  overflow-x: auto;
}
.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}
.post-cta {
  border-top: 1px solid var(--line);
  padding: 32px 0 56px;
  max-width: var(--readw);
}
.post-cta p {
  color: var(--text-2);
  margin-bottom: 16px;
}

footer {
  border-top: 1px solid var(--line);
  padding: 26px 0;
  font-size: 12.5px;
  color: var(--text-3);
}
.foot-in {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- mobile ---------- */
@media (max-width: 900px) {
  .post-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .nav-burger {
    display: inline-flex;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 4px 24px 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(11, 31, 51, 0.06);
  }
  .nav.open .nav-links {
    display: flex;
  }
  .nav-links > a:not(.btn) {
    padding: 13px 0;
    border-bottom: 1px solid var(--line);
    color: var(--text);
    font-size: 1rem;
  }
  .nav-drop {
    padding: 16px 0 4px;
  }
  .nav-drop-btn {
    pointer-events: none;
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-3);
  }
  .nav-drop-btn svg {
    display: none;
  }
  .nav-menu {
    display: block;
    position: static;
    transform: none;
    padding-top: 2px;
  }
  .nav-menu-in {
    min-width: 0;
    padding: 0;
    background: none;
    border: 0;
    box-shadow: none;
  }
  .nav-links .nav-menu a {
    padding: 10px 0;
    border-radius: 0;
    font-size: 1rem;
  }
  .nav-links .nav-menu a:hover,
  .nav-links .nav-menu a[aria-current="page"] {
    background: none;
    color: var(--accent);
  }
  .nav-links .btn {
    margin-top: 14px;
    background: var(--accent);
    border-color: transparent;
    color: #fff;
  }
  .page-head {
    padding: 44px 0 34px;
  }
  .article-head {
    padding: 40px 0 26px;
  }
}
@media (max-width: 520px) {
  .nav-links {
    padding-left: 18px;
    padding-right: 18px;
  }
  .wrap {
    padding: 0 18px;
  }
  h1 {
    font-size: 1.85rem;
  }
  .post-cta .btn {
    width: 100%;
  }
  .prose pre {
    font-size: 10.5px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}