/* ============================================================
   root@ — "terminal editorial" signature theme
   Mono headings (JetBrains) + serif body (Source Serif),
   warm-black + amber, hairline borders, prompt motifs.
   ============================================================ */

:root {
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;

  /* dark = default identity */
  --bg: #0e1013;
  --surface: #15181e;
  --surface-2: #1b1f27;
  --text: #e7e3d9;
  --muted: #888e9a;
  --border: #262b34;
  --accent: #ffb454;
  --accent-ink: #0e1013;
  --link: #ffc379;
  --sel: rgba(255, 180, 84, .22);
  --grid: rgba(255, 255, 255, .02);
  --glow: rgba(255, 180, 84, .10);

  --radius: 2px;
  --maxw: 1600px;
  --maxw-read: 880px;
}

:root[data-theme="light"] {
  --bg: #f4f1e9;
  --surface: #ede8dc;
  --surface-2: #e6e0d1;
  --text: #1b1a16;
  --muted: #6c6960;
  --border: #dcd4c4;
  --accent: #b4530a;
  --accent-ink: #fffaf2;
  --link: #9a3609;
  --sel: rgba(180, 83, 10, .16);
  --grid: rgba(0, 0, 0, .022);
  --glow: rgba(180, 83, 10, .06);
}

/* ---- Base ---- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(120% 80% at 50% -8%, var(--glow), transparent 55%),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 100% 720px, 46px 46px, 46px 46px;
  background-repeat: no-repeat, repeat, repeat;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}
body::before {
  content: ""; position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 100;
  background: linear-gradient(90deg, var(--accent), transparent 55%);
}
::selection { background: var(--sel); }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 40px; }
.shell { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 56px; padding-top: 46px; padding-bottom: 84px; align-items: start; }
.shell__main { min-width: 0; }
.sidebar { position: sticky; top: 78px; display: flex; flex-direction: column; gap: 32px; font-family: var(--font-mono); font-size: 13px; color: var(--muted); line-height: 1.6; }
.sidebar__h { color: var(--accent); margin: 0 0 12px; }
.sidebar__name { color: var(--text); font-size: 15px; margin: 0 0 4px; }
.sidebar p { margin: 0 0 6px; }
.sidebar a { color: var(--text); }
.sidebar a:hover { color: var(--accent); }
.sidebar__social a { color: var(--muted); }
.sidebar__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.sidebar__list a { line-height: 1.4; }
.sidebar__tags { display: flex; flex-wrap: wrap; gap: 6px; }
@media (max-width: 980px) {
  .shell { grid-template-columns: 1fr; gap: 0; }
  .sidebar { position: static; margin-top: 44px; padding-top: 30px; border-top: 1px solid var(--border); }
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }
.mono { font-family: var(--font-mono); }
.muted { color: var(--muted); }
.sep { color: var(--border); margin: 0 .5ch; }

/* ---- Blinking caret ---- */
.caret { display: inline-block; width: .5em; height: 1.02em; background: var(--accent); margin-left: .16em; vertical-align: -0.16em; animation: blink 1.15s steps(1) infinite; }
.caret--sm { height: .82em; width: .42em; margin-left: .1em; }
@keyframes blink { 0%, 50% { opacity: 1; } 50.01%, 100% { opacity: 0; } }

/* ---- Header (prompt / status bar) ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: blur(9px);
  backdrop-filter: blur(9px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner { display: flex; align-items: center; gap: 16px; height: 56px; }
.logo { font-family: var(--font-mono); font-weight: 700; font-size: 14.5px; letter-spacing: -.2px; display: inline-flex; align-items: center; white-space: nowrap; }
.logo:hover { text-decoration: none; }
.logo__u { color: var(--accent); }
.logo__at, .logo__p { color: var(--muted); }
.logo__h { color: var(--text); }
.nav { display: flex; gap: 2px; margin-left: auto; flex-wrap: wrap; font-family: var(--font-mono); }
.nav a { color: var(--muted); font-size: 13px; padding: 5px 9px; border: 1px solid transparent; border-radius: var(--radius); }
.nav a:hover { color: var(--accent); border-color: var(--border); background: var(--surface); text-decoration: none; }
.theme-toggle { width: 34px; height: 34px; border: 1px solid var(--border); background: var(--surface); border-radius: var(--radius); cursor: pointer; display: grid; place-items: center; color: var(--muted); font-size: 15px; transition: color .15s, border-color .15s; }
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle::before { content: "\2609"; }
:root[data-theme="light"] .theme-toggle::before { content: "\263D"; }

/* ---- Hero ---- */
.hero { padding: 26px 0 40px; border-bottom: 1px solid var(--border); margin-bottom: 34px; }
.hero__cmd { font-family: var(--font-mono); font-size: 13.5px; color: var(--muted); margin: 0 0 16px; }
.hero__prompt { color: var(--accent); }
.hero__title { font-family: var(--font-mono); font-weight: 800; font-size: clamp(40px, 6.4vw, 62px); line-height: .98; letter-spacing: -2.5px; margin: 0 0 18px; }
.hero__tagline { font-family: var(--font-mono); font-size: 15px; color: var(--muted); margin: 0; }

/* ---- Filters ---- */
.filters-block { margin-bottom: 8px; }
.filters__label { font-family: var(--font-mono); font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-family: var(--font-mono); font-size: 13px; color: var(--muted); background: transparent; cursor: pointer; border: 1px solid var(--border); border-radius: var(--radius); padding: 4px 11px; transition: color .12s, border-color .12s, background .12s; }
.chip::before { content: "#"; color: var(--accent); opacity: .55; }
.chip[data-filter="*"]::before { content: ""; }
.chip:hover { color: var(--accent); border-color: var(--accent); }
.chip.is-active { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }
.chip.is-active::before { color: var(--accent-ink); opacity: .7; }

/* ---- Post list (editorial index: meta rail + content) ---- */
.post-list { counter-reset: post; border-top: 1px solid var(--border); margin-top: 26px; }
.card {
  counter-increment: post;
  display: grid; grid-template-columns: minmax(140px, 200px) minmax(0, 1fr); column-gap: 40px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  transition: background .15s ease;
}
.card:hover { background: var(--surface); }
.card.is-hidden { display: none; }
.card__aside { display: flex; flex-direction: column; gap: 3px; font-family: var(--font-mono); }
.card__aside::before { content: counter(post, decimal-leading-zero); font-size: 12.5px; color: var(--muted); margin-bottom: 8px; }
.card:hover .card__aside::before { color: var(--accent); }
.card__date { font-size: 13.5px; color: var(--text); }
.card__sub { font-size: 12px; color: var(--muted); }
.badge { display: inline-block; font-family: var(--font-mono); font-size: 12px; color: var(--accent); border: 1px solid var(--accent); border-radius: var(--radius); padding: 1px 8px; margin-bottom: 12px; }
.badge:hover { text-decoration: none; background: var(--accent); color: var(--accent-ink); }
.card__title { font-family: var(--font-mono); font-weight: 700; font-size: 22px; line-height: 1.3; letter-spacing: -.4px; margin: 0; }
.card__title a { color: var(--text); }
.card__title a::before { content: "\276F  "; color: var(--accent); }
.card__title a:hover { color: var(--accent); text-decoration: none; }
.card__excerpt { margin: 12px 0 0; color: var(--muted); font-size: 16.5px; }
.card__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.empty-hint { font-family: var(--font-mono); color: var(--muted); padding: 30px 0; }

@media (max-width: 720px) {
  .card { grid-template-columns: 1fr; row-gap: 10px; }
  .card__aside { flex-direction: row; align-items: baseline; gap: 12px; }
  .card__aside::before { margin-bottom: 0; }
}

/* ---- Tags ---- */
.tag { font-family: var(--font-mono); font-size: 12px; color: var(--muted); border: 1px solid var(--border); border-radius: var(--radius); padding: 1px 7px; }
a.tag:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.tag--now { color: var(--accent); border-color: var(--accent); margin-left: 8px; }

/* ---- Post ---- */
.post { max-width: var(--maxw-read); margin: 0; }
.post__header { margin-bottom: 28px; padding-bottom: 22px; border-bottom: 1px solid var(--border); }
.post__title { font-family: var(--font-mono); font-weight: 800; font-size: clamp(28px, 5vw, 41px); line-height: 1.1; letter-spacing: -1.2px; margin: 0 0 16px; }
.post__meta { font-family: var(--font-mono); font-size: 13px; color: var(--muted); }
.post__content { font-size: 18.5px; }
.post__content h2 { font-family: var(--font-mono); font-weight: 700; font-size: 24px; letter-spacing: -.5px; margin: 44px 0 16px; }
.post__content h2::before { content: "## "; color: var(--accent); }
.post__content h3 { font-family: var(--font-mono); font-weight: 700; font-size: 19px; margin: 32px 0 12px; }
.post__content h3::before { content: "### "; color: var(--accent); opacity: .8; }
.post__content p { margin: 0 0 20px; }
.post__content ul, .post__content ol { padding-left: 22px; margin: 0 0 20px; }
.post__content li { margin: 7px 0; }
.post__content li::marker { color: var(--accent); }
.post__content a { text-decoration: underline; text-underline-offset: 2px; text-decoration-color: color-mix(in srgb, var(--link) 45%, transparent); }
.post__content blockquote { margin: 24px 0; padding: 8px 20px; color: var(--muted); border-left: 2px solid var(--accent); background: var(--surface); font-style: italic; }
.post__content hr { border: 0; border-top: 1px dashed var(--border); margin: 40px 0; }
.post__content img { border: 1px solid var(--border); border-radius: var(--radius); }
.post__tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 42px 0 0; padding-top: 24px; border-top: 1px solid var(--border); }
.post__back { font-family: var(--font-mono); font-size: 14px; margin-top: 28px; }

/* ---- Code ---- */
code { font-family: var(--font-mono); font-size: .82em; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: .1em .42em; }
pre { background: var(--surface); border: 1px solid var(--border); border-left: 2px solid var(--accent); border-radius: var(--radius); padding: 16px 18px; overflow: auto; font-size: 14px; line-height: 1.65; }
pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.highlight { border-radius: var(--radius); }

/* ---- Series box (terminal callout) ---- */
.series-box { background: var(--surface); border: 1px solid var(--border); border-left: 2px solid var(--accent); border-radius: var(--radius); padding: 16px 20px; margin: 0 0 32px; }
.series-box__head { font-family: var(--font-mono); display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; font-size: 15px; }
.series-box__prompt { color: var(--accent); }
.series-box__head strong { color: var(--text); font-weight: 700; }
.series-box__count { color: var(--muted); font-size: 12.5px; }
.series-box__list { font-family: var(--font-mono); font-size: 14px; margin: 0; padding-left: 22px; }
.series-box__list li { margin: 6px 0; }
.series-box__list li::marker { color: var(--accent); }
.series-box__list li.is-current { color: var(--text); }

/* ---- Pages: series / tags / archive / about ---- */
.page { max-width: none; margin: 0; }
.page__title { font-family: var(--font-mono); font-weight: 800; font-size: clamp(28px, 5vw, 40px); letter-spacing: -1px; margin: 0 0 22px; }
.page__title::before { content: "~/"; color: var(--accent); }
.page__content h2 { font-family: var(--font-mono); }
.page__content p { max-width: 820px; }

.series-group { margin: 0; padding: 22px 0; border-bottom: 1px solid var(--border); }
.series-group__title { font-family: var(--font-mono); font-weight: 700; font-size: 20px; margin: 0 0 12px; letter-spacing: -.3px; }
.series-group__title::before { content: "\276F  "; color: var(--accent); }
.series-group__list { font-family: var(--font-mono); font-size: 15px; margin: 0; padding-left: 22px; }
.series-group__list li { margin: 7px 0; }
.series-group__list li::marker { color: var(--accent); }

.tagcloud { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 36px; }
.tag--lg { font-size: 14px; padding: 4px 10px; }
.tag__count { color: var(--accent); font-weight: 700; }
.tag-section { margin: 0 0 24px; scroll-margin-top: 80px; }
.tag-section__title { font-family: var(--font-mono); font-size: 18px; margin: 0 0 10px; letter-spacing: -.2px; }
.tag-section__list { font-family: var(--font-mono); font-size: 15px; margin: 0; padding-left: 22px; }
.tag-section__list li { margin: 6px 0; }
.tag-section__list li::marker { color: var(--accent); }

.archive-year { margin: 0 0 8px; }
.archive-year h2 { font-family: var(--font-mono); font-size: 22px; margin: 26px 0 4px; }
.archive-year h2::before { content: "/"; color: var(--accent); }
.archive-year ul { list-style: none; margin: 0; padding: 0; }
.archive-year li { display: flex; gap: 14px; padding: 9px 0; border-bottom: 1px solid var(--border); font-family: var(--font-mono); font-size: 15px; }

/* ---- Footer ---- */
.site-footer { border-top: 1px solid var(--border); margin-top: 64px; }
.site-footer__inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding: 24px; font-family: var(--font-mono); font-size: 13px; color: var(--muted); }
.site-footer p { margin: 0; }
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--accent); }

/* ---- Responsive ---- */
@media (max-width: 640px) {
  body { font-size: 17px; }
  .hero__title { letter-spacing: -1.5px; }
  .site-header__inner { gap: 8px; }
  .nav a { padding: 5px 6px; font-size: 12px; }
}