/* Shared chrome + typography for individual blog posts.
   Linked from each post; the blog index has its own (different) layout. */

:root {
  --accent: #B83A4B;
  --accent-warm: #f09228;
  --accent-deep: #8e2b3a;
  --accent-soft: rgba(184, 58, 75, 0.12);
  --accent-softer: rgba(184, 58, 75, 0.06);
  --ink: #1f1f23;
  --ink-soft: #4a4a52;
  --ink-mute: #82828a;
  --paper: #fffdfa;
  --paper-warm: #fffaf3;
  --rule: rgba(184, 58, 75, 0.16);
  --rule-faint: rgba(184, 58, 75, 0.08);
}

* { box-sizing: border-box; }
html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
body {
  margin: 0;
  padding: 0 24px 56px;
  color: var(--ink);
  font-family: 'Ubuntu', sans-serif;
  font-size: 17px;
  line-height: 1.8;
  background:
    radial-gradient(ellipse 1000px 400px at 50% -80px, rgba(184, 58, 75, 0.05), transparent 70%),
    radial-gradient(ellipse 700px 260px at 85% 20%, rgba(240, 146, 40, 0.025), transparent 72%),
    linear-gradient(180deg, #fdfbf9 0%, #ffffff 700px);
  background-attachment: fixed;
  animation: fadeInPage 0.55s ease-out;
  overflow-x: hidden;
}
@keyframes fadeInPage {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:focus, a:hover { color: var(--accent-warm); }

main {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding-top: 40px;
}

/* ===== Top nav ===== */
.top-links {
  margin: 0 0 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}
.top-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background-color: var(--paper);
  color: var(--accent);
  box-shadow: 0 1px 2px rgba(184, 58, 75, 0.04);
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}
.top-nav-link:hover {
  border-color: rgba(184, 58, 75, 0.35);
  background-color: var(--paper-warm);
  color: var(--accent-warm);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(184, 58, 75, 0.12);
}
.top-nav-link .arrow-back {
  display: inline-block;
  transition: transform 0.2s ease;
}
.top-nav-link:hover .arrow-back { transform: translateX(-3px); }

.theme-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(184, 58, 75, 0.04);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--paper-warm);
  border-color: rgba(184, 58, 75, 0.35);
  color: var(--accent);
  box-shadow: 0 4px 14px rgba(184, 58, 75, 0.12);
  transform: translateY(-1px);
  outline: none;
}
.theme-toggle svg { display: block; }
.theme-toggle .icon-sun { display: none; }
:root.dark .theme-toggle .icon-sun { display: block; }
:root.dark .theme-toggle .icon-moon { display: none; }

/* ===== Article shell + typography ===== */
.article-shell {
  width: 100%;
  max-width: 100%;
  background-color: #ffffff;
  border: 1px solid rgba(184, 58, 75, 0.12);
  border-radius: 18px;
  padding: 42px 44px;
  box-shadow:
    0 16px 36px rgba(0, 0, 0, 0.05),
    0 2px 6px rgba(184, 58, 75, 0.04),
    0 0 0 1px rgba(184, 58, 75, 0.03);
}
h1 {
  margin: 0;
  font-size: 38px;
  line-height: 1.18;
  font-weight: 500;
  letter-spacing: -0.02em;
  text-wrap: balance;
  color: var(--ink);
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
  padding-bottom: 8px;
  background-image: linear-gradient(90deg, var(--accent) 0%, rgba(184, 58, 75, 0.4) 55%, rgba(184, 58, 75, 0.05) 90%, transparent 100%);
  background-position: 0 100%;
  background-size: 100% 2px;
  background-repeat: no-repeat;
}
h1::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin: 0 12px 6px 0;
  vertical-align: middle;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(184, 58, 75, 0.14);
}
.subtitle {
  margin: 18px 0 26px;
  font-size: 17.5px;
  color: var(--ink-soft);
  max-width: 60ch;
  line-height: 1.55;
}
h2 {
  position: relative;
  margin: 40px 0 12px;
  padding-left: 16px;
  font-size: 24px;
  font-weight: 500;
  text-wrap: balance;
  letter-spacing: -0.005em;
  color: var(--ink);
  scroll-margin-top: 20px;
}
h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.28em;
  bottom: 0.28em;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent) 0%, rgba(184, 58, 75, 0.3) 100%);
}
p {
  margin: 0 0 18px;
  color: var(--ink-soft);
  overflow-wrap: break-word;
}
strong { font-weight: 500; color: var(--ink); }
ul, ol {
  margin: 0 0 18px 22px;
  padding: 0;
  color: var(--ink-soft);
}
li { margin: 0 0 14px; }

.footer-note {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px dashed rgba(184, 58, 75, 0.18);
  font-size: 14.5px;
  color: var(--ink-mute);
  line-height: 1.6;
  text-align: center;
  font-style: italic;
}

/* ===== Dark mode ===== */
:root.dark {
  color-scheme: dark;
  --accent: #e5566b;
  --accent-warm: #f5a84a;
  --accent-deep: #ff9fae;
  --accent-soft: rgba(229, 86, 107, 0.18);
  --accent-softer: rgba(229, 86, 107, 0.08);
  --ink: #ececf0;
  --ink-soft: #b4b4bb;
  --ink-mute: #7a7a82;
  --paper: #16161a;
  --paper-warm: #1d1d22;
  --rule: rgba(229, 86, 107, 0.22);
  --rule-faint: rgba(229, 86, 107, 0.1);
}
:root.dark body {
  background:
    radial-gradient(ellipse 1000px 400px at 50% -80px, rgba(229, 86, 107, 0.09), transparent 70%),
    radial-gradient(ellipse 700px 260px at 85% 20%, rgba(240, 146, 40, 0.045), transparent 72%),
    linear-gradient(180deg, #15151a 0%, #0e0e12 700px);
}
:root.dark .article-shell {
  background-color: #131317;
  border-color: rgba(229, 86, 107, 0.14);
  box-shadow:
    0 16px 36px rgba(0, 0, 0, 0.5),
    0 2px 6px rgba(229, 86, 107, 0.08),
    0 0 0 1px rgba(229, 86, 107, 0.05);
}
:root.dark h1::before { box-shadow: 0 0 0 3px rgba(229, 86, 107, 0.2); }
:root.dark .footer-note { border-top-color: rgba(229, 86, 107, 0.24); }
:root.dark .top-nav-link {
  background-color: #1d1d22;
  color: var(--accent);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}
:root.dark .top-nav-link:hover {
  background-color: #24242c;
  box-shadow: 0 4px 14px rgba(229, 86, 107, 0.2);
}
:root.dark .theme-toggle { background-color: #1d1d22; }
:root.dark .theme-toggle:hover,
:root.dark .theme-toggle:focus-visible { background-color: #24242c; }

/* ===== Responsive ===== */
@media (max-width: 720px) {
  body {
    padding: 0 14px 40px;
    font-size: 16px;
  }
  main { padding-top: 28px; }
  .article-shell {
    padding: 28px 22px;
    border-radius: 14px;
  }
  h1 { font-size: 30px; }
  h1::before {
    width: 7px;
    height: 7px;
    margin: 0 10px 5px 0;
    box-shadow: 0 0 0 2px rgba(184, 58, 75, 0.14);
  }
  .subtitle { font-size: 16.5px; }
  h2 { font-size: 22px; padding-left: 14px; }
  .top-links { gap: 6px; }
  .top-nav-link { padding: 5px 12px; }
}

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