:root {
  color-scheme: light dark;
  --bg: #07111f;
  --bg-elevated: #0d1b2d;
  --surface: rgba(18, 35, 56, .86);
  --surface-solid: #122338;
  --text: #eef6ff;
  --muted: #9eb0c7;
  --accent: #63d5ff;
  --accent-strong: #22b5ee;
  --accent-soft: rgba(99, 213, 255, .12);
  --line: rgba(159, 186, 218, .2);
  --warning: #ffd166;
  --danger: #ff8a8a;
  --shadow: 0 22px 70px rgba(0, 0, 0, .26);
  --radius: 20px;
  --content: 1240px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f7fb;
  --bg-elevated: #eaf1f9;
  --surface: rgba(255, 255, 255, .9);
  --surface-solid: #fff;
  --text: #12233b;
  --muted: #596b82;
  --accent: #006f9f;
  --accent-strong: #005b84;
  --accent-soft: rgba(0, 111, 159, .09);
  --line: rgba(51, 78, 105, .18);
  --warning: #925c00;
  --danger: #b52e35;
  --shadow: 0 22px 60px rgba(42, 65, 91, .12);
}

@media (prefers-color-scheme: light) {
  html[data-theme="auto"] {
    color-scheme: light;
    --bg: #f4f7fb;
    --bg-elevated: #eaf1f9;
    --surface: rgba(255, 255, 255, .9);
    --surface-solid: #fff;
    --text: #12233b;
    --muted: #596b82;
    --accent: #006f9f;
    --accent-strong: #005b84;
    --accent-soft: rgba(0, 111, 159, .09);
    --line: rgba(51, 78, 105, .18);
    --warning: #925c00;
    --danger: #b52e35;
    --shadow: 0 22px 60px rgba(42, 65, 91, .12);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 15% -10%, rgba(56, 189, 248, .18), transparent 34rem),
    radial-gradient(circle at 90% 10%, rgba(129, 140, 248, .12), transparent 28rem),
    var(--bg);
  font: 14px/1.48 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
}

a { color: var(--accent); text-decoration-thickness: .08em; text-underline-offset: .2em; }
a:hover { color: var(--accent-strong); }
button, input { font: inherit; }
button { color: inherit; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  color: var(--bg);
  background: var(--accent);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.reading-progress {
  position: fixed;
  z-index: 90;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  pointer-events: none;
}
.reading-progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--accent), #a78bfa); }
.page-home .reading-progress { display: none; }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(18px) saturate(145%);
}
.header-inner {
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto minmax(95px, 1fr);
  align-items: center;
  gap: 20px;
  width: min(var(--content), calc(100% - 36px));
  min-height: 60px;
  margin: 0 auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  width: max-content;
  color: var(--text);
  text-decoration: none;
  line-height: 1.1;
}
.brand:hover { color: var(--text); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  color: #061521;
  background: linear-gradient(140deg, #a5f3fc, #38bdf8 55%, #818cf8);
  font-weight: 900;
}
.brand strong, .brand small { display: block; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.site-nav { display: flex; align-items: center; gap: 6px; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); background: var(--accent-soft); }
.theme-toggle {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }

.site-main { width: min(var(--content), calc(100% - 36px)); margin: 0 auto; }
.home-main { padding: 36px 0 20px; }
.eyebrow { margin: 0 0 16px; color: var(--accent); font-size: 13px; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.archive-controls-title { margin-top: 34px; margin-bottom: -22px; }
.hero h1 { max-width: 850px; margin: 0; font-size: clamp(36px, 5.2vw, 62px); line-height: 1; letter-spacing: -.04em; }
.hero .lead { max-width: 760px; margin: 14px 0 0; color: var(--muted); font-size: clamp(14px, 1.4vw, 16px); line-height: 1.45; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 9px 18px; margin-top: 20px; }
.meta-pill { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; font-weight: 650; }
.meta-pill::before { content: ""; width: 7px; height: 7px; border-radius: 2px; background: var(--accent); box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 58%, transparent); transform: rotate(45deg); }

.archive-controls {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  gap: 16px;
  align-items: center;
  margin: 34px 0 14px;
}
.search-wrap { position: relative; }
.search-wrap svg { position: absolute; top: 50%; left: 16px; width: 18px; color: var(--muted); transform: translateY(-50%); }
.archive-search {
  width: 100%;
  min-height: 48px;
  padding: 8px 42px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  background: var(--surface);
}
.archive-search::placeholder { color: var(--muted); }
.clear-search {
  position: absolute;
  top: 50%;
  right: 9px;
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  transform: translateY(-50%);
  cursor: pointer;
}
.clear-search[data-visible="true"] { display: block; }
.clear-search:hover { background: var(--accent-soft); }
.filter-group { display: flex; flex-wrap: wrap; gap: 7px; }
.filter-button {
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
}
.filter-button:hover, .filter-button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.results-summary { grid-column: 1 / -1; min-height: 24px; margin: -4px 0 0; color: var(--muted); font-size: 14px; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin: 12px 0 14px; }
.section-heading h2 { margin: 0; font-size: clamp(23px, 2.2vw, 30px); letter-spacing: -.025em; }
.section-heading > p { max-width: 470px; margin: 0 0 2px; color: var(--muted); text-align: right; }
.section-kicker { margin: 0 0 3px; color: var(--accent); font-size: 11px; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }

.archive-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.archive-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 214px;
  padding: 17px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, color-mix(in srgb, var(--surface-solid) 94%, transparent), var(--surface));
  box-shadow: var(--shadow);
  transition: transform .2s ease, border-color .2s ease;
}
.archive-card::before { content: ""; position: absolute; top: -90px; right: -70px; width: 190px; height: 190px; border-radius: 50%; background: var(--card-accent, var(--accent)); opacity: .1; filter: blur(2px); }
.archive-card:hover { border-color: color-mix(in srgb, var(--card-accent, var(--accent)) 55%, var(--line)); transform: translateY(-3px); }
.archive-card[hidden] { display: none; }
.archive-card[data-platform="hackernews"] { --card-accent: #ff8b3d; }
.archive-card[data-platform="twitter"] { --card-accent: #65d5ff; }
.archive-card[data-platform="reddit"] { --card-accent: #ff6534; }
.archive-card[data-platform="producthunt"] { --card-accent: #ff5a7a; }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.card-meta, .history-meta { display: inline-flex; align-items: center; gap: 8px; }
.archive-kind { display: inline-flex; align-items: center; min-height: 20px; padding: 2px 7px; border: 1px solid color-mix(in srgb, var(--card-accent, var(--accent)) 42%, var(--line)); border-radius: 999px; color: var(--accent); background: var(--accent-soft); font-size: 10px; font-weight: 800; letter-spacing: .04em; white-space: nowrap; }
.platform-label { display: inline-flex; align-items: center; gap: 9px; font-weight: 750; }
.platform-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--card-accent); box-shadow: 0 0 18px var(--card-accent); }
.card-date { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 13px; }
.archive-card h2 { margin: 18px 0 7px; font-size: clamp(20px, 2vw, 25px); line-height: 1.12; letter-spacing: -.02em; }
.archive-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.42; }
.card-tags { display: flex; flex-wrap: wrap; gap: 5px; margin: 12px 0 16px; }
.card-tags span { padding: 4px 8px; border-radius: 7px; color: var(--muted); background: var(--accent-soft); font-size: 12px; }
.card-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 8px; width: 100%; min-height: 46px; margin-top: auto; padding: 10px 12px; border: 1px solid color-mix(in srgb, var(--card-accent, var(--accent)) 42%, var(--line)); border-radius: 12px; color: var(--text); background: color-mix(in srgb, var(--card-accent, var(--accent)) 10%, var(--surface)); font-weight: 750; text-decoration: none; }
.card-link:hover { border-color: var(--card-accent, var(--accent)); color: var(--text); background: color-mix(in srgb, var(--card-accent, var(--accent)) 16%, var(--surface)); }
.card-link::after { content: "→"; transition: transform .2s ease; }
.archive-card:hover .card-link::after { transform: translateX(4px); }
.card-link-disabled { color: var(--muted); border-style: dashed; background: transparent; cursor: default; }
.card-link-disabled::after { content: ""; }
.archive-card:hover .card-link-disabled::after { transform: none; }
.empty-state { display: none; padding: 42px; border: 1px dashed var(--line); border-radius: var(--radius); color: var(--muted); text-align: center; }
.empty-state[data-visible="true"] { display: block; }
.history-section { margin: 44px 0 34px; }
.history-groups { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.history-group { overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.history-group > summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 54px; padding: 10px 15px; cursor: pointer; font-weight: 800; list-style: none; }
.history-group > summary::-webkit-details-marker { display: none; }
.history-group > summary > span { display: inline-flex; align-items: center; gap: 9px; }
.history-group > summary::after { content: "+"; order: 3; color: var(--muted); font-size: 20px; font-weight: 500; }
.history-group[open] > summary::after { content: "−"; }
.history-group > summary strong { margin-left: auto; color: var(--muted); font-size: 12px; font-weight: 650; }
.history-group[data-history-group]:nth-child(1) { --card-accent: #ff8b3d; }
.history-group[data-history-group]:nth-child(2) { --card-accent: #65d5ff; }
.history-group[data-history-group]:nth-child(3) { --card-accent: #ff6534; }
.history-group[data-history-group]:nth-child(4) { --card-accent: #ff5a7a; }
.history-list { display: grid; gap: 1px; margin: 0; padding: 0 10px 10px; list-style: none; }
.history-list li[hidden] { display: none; }
.history-empty { padding: 12px 10px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.history-list a { display: flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 48px; padding: 9px 10px; border-top: 1px solid var(--line); border-radius: 8px; color: var(--text); text-decoration: none; }
.history-list a:hover { color: var(--accent); background: var(--accent-soft); }
.history-list time { flex: 0 0 auto; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.status-note { display: grid; grid-template-columns: auto 1fr; gap: 14px; margin: 24px 0 0; padding: 17px 18px; border: 1px solid color-mix(in srgb, var(--warning) 34%, var(--line)); border-radius: 14px; color: var(--muted); background: color-mix(in srgb, var(--warning) 8%, var(--surface)); }
.status-note strong { color: var(--text); }

.article-shell { padding: 20px 0 52px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; margin-bottom: 28px; color: var(--muted); font-size: 14px; }
.breadcrumbs a { color: var(--muted); }
.article-layout { display: grid; grid-template-columns: 220px minmax(0, 760px); gap: 50px; align-items: start; }
.toc-panel { position: sticky; top: 100px; max-height: calc(100vh - 124px); overflow: auto; padding: 16px 0; }
.toc-title { display: block; width: 100%; margin: 0 0 10px; padding: 0; border: 0; color: var(--text); background: transparent; font-size: 13px; font-weight: 800; letter-spacing: .08em; text-align: left; text-transform: uppercase; }
#page-toc { display: grid; gap: 3px; border-left: 1px solid var(--line); }
#page-toc a { display: block; padding: 5px 12px; border-left: 2px solid transparent; color: var(--muted); font-size: 13px; line-height: 1.4; text-decoration: none; }
#page-toc a:hover, #page-toc a[aria-current="true"] { border-left-color: var(--accent); color: var(--accent); background: linear-gradient(90deg, var(--accent-soft), transparent); }
#page-toc a[data-level="3"] { padding-left: 24px; font-size: 12px; }
.prose { min-width: 0; }
.prose { font-size: 14px; line-height: 1.5; }
.prose > h1:first-child { margin: 0 0 10px; font-size: clamp(31px, 4vw, 46px); line-height: 1.05; letter-spacing: -.035em; }
.prose h2 { margin: 36px 0 12px; padding-top: 6px; font-size: clamp(22px, 2.5vw, 28px); line-height: 1.18; letter-spacing: -.02em; }
.prose h3 { margin: 34px 0 12px; }
.prose p, .prose li { color: color-mix(in srgb, var(--text) 88%, var(--muted)); }
.prose p { margin: 10px 0; }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li + li { margin-top: 7px; }
.prose blockquote { margin: 26px 0; padding: 14px 18px; border-left: 3px solid var(--accent); border-radius: 0 12px 12px 0; background: var(--accent-soft); }
.prose blockquote p { margin: 0; color: var(--muted); }
.prose code { padding: .12em .35em; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); font-size: .9em; }
.prose a { overflow-wrap: anywhere; }
.heading-anchor {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-left: 8px;
  border: 0;
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  opacity: 0;
  cursor: pointer;
  vertical-align: middle;
}
.prose h2:hover .heading-anchor, .prose h3:hover .heading-anchor, .heading-anchor:focus-visible { opacity: 1; }
.heading-anchor:hover { color: var(--accent); background: var(--accent-soft); }
.copy-toast { position: fixed; z-index: 80; left: 50%; bottom: 28px; padding: 9px 14px; border: 1px solid var(--line); border-radius: 999px; color: var(--text); background: var(--surface-solid); box-shadow: var(--shadow); transform: translate(-50%, 20px); opacity: 0; pointer-events: none; transition: .2s ease; }
.copy-toast[data-visible="true"] { transform: translate(-50%, 0); opacity: 1; }
.back-to-top { position: fixed; z-index: 40; right: 22px; bottom: 22px; display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 50%; color: var(--text); background: var(--surface-solid); box-shadow: var(--shadow); opacity: 0; pointer-events: none; transform: translateY(10px); transition: .2s ease; cursor: pointer; }
.back-to-top[data-visible="true"] { opacity: 1; pointer-events: auto; transform: translateY(0); }

.site-footer { display: flex; justify-content: space-between; gap: 18px; width: min(var(--content), calc(100% - 36px)); margin: 0 auto; padding: 14px 0 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.site-footer strong, .site-footer span { display: block; }
.site-footer strong { margin-bottom: 2px; color: var(--text); }

.error-page { max-width: 720px; min-height: 62vh; padding: clamp(70px, 12vw, 140px) 0; }
.error-page h1 { margin: 0; font-size: clamp(38px, 7vw, 68px); line-height: 1; letter-spacing: -.04em; }
.error-page p:not(.eyebrow) { max-width: 580px; margin: 20px 0 28px; color: var(--muted); font-size: 16px; }
.primary-action { display: inline-flex; align-items: center; gap: 14px; min-height: 48px; padding: 10px 16px; border-radius: 12px; color: #061521; background: var(--accent); font-weight: 800; text-decoration: none; }
.primary-action:hover { color: #061521; background: color-mix(in srgb, var(--accent) 86%, white); }

@media (max-width: 900px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .site-nav { grid-column: 1 / -1; justify-content: flex-start; overflow-x: auto; margin: -8px 0 10px; padding-bottom: 2px; }
  .theme-toggle { grid-column: 2; grid-row: 1; }
  .article-layout { grid-template-columns: 1fr; gap: 12px; }
  .archive-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .history-groups { grid-template-columns: 1fr; }
  .toc-panel { position: static; max-height: none; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
  #page-toc { display: none; margin-top: 8px; }
  .toc-panel[data-open="true"] #page-toc { display: grid; }
  .toc-title { display: flex; justify-content: space-between; margin: 0; cursor: pointer; }
  .toc-title::after { content: "+"; font-size: 18px; line-height: 1; }
  .toc-panel[data-open="true"] .toc-title::after { content: "−"; }
}

@media (max-width: 700px) {
  .header-inner, .site-main, .site-footer { width: min(100% - 28px, var(--content)); }
  .header-inner { gap: 10px; }
  .brand small { display: none; }
  .brand strong { font-size: 14px; }
  .theme-label { display: none; }
  .theme-toggle { width: 44px; height: 44px; justify-content: center; padding: 0; }
  .site-nav a { min-height: 44px; padding: 6px 10px; font-size: 14px; }
  .home-main { padding-top: 38px; }
  .archive-controls { grid-template-columns: 1fr; margin-top: 42px; }
  .archive-grid { grid-template-columns: 1fr; }
  .archive-card { min-height: 220px; }
  .section-heading { align-items: start; flex-direction: column; gap: 6px; }
  .section-heading > p { text-align: left; }
  .site-footer { flex-direction: column; }
  .back-to-top { right: 14px; bottom: 14px; }
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}