/* ── Reset & Base ─────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0e0f11;
  --bg-card:   #141518;
  --bg-hover:  #1a1c20;
  --border:    #2a2c32;
  --text:      #c9cdd4;
  --text-dim:  #636870;
  --text-head: #e8eaed;
  --accent:    #7eaadc;
  --accent-dim:#2d4a6e;
  --tag-bg:    #1a1d23;
  --tag-text:  #8892a0;

  --font-display: Arial, Helvetica, sans-serif;
  --font-body:    Arial, Helvetica, sans-serif;
  --font-mono:    'Courier New', Courier, monospace;

  --max-w: 780px;
  --col-gap: 2rem;
}

html { font-size: 17px; -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  min-height: 100vh;
}

/* ── Layout ───────────────────────────────────── */
.site-wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Site Header ──────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
  margin-bottom: 3.5rem;
}

.site-header .site-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.site-logo::before {
  content: '>';
  color: var(--text-dim);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.site-nav a:hover { color: var(--text); }

/* ── Site Footer ──────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 6rem;
  padding: 2rem 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}
.site-footer .site-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.site-footer a { color: var(--text-dim); text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

/* ── Tags ─────────────────────────────────────── */
.tag {
  display: inline-block;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2em 0.7em;
  border-radius: 3px;
  border: 1px solid var(--border);
}

/* ── Index Page ───────────────────────────────── */
.index-hero {
  margin-bottom: 4rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.index-hero-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.index-hero-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--accent);
}

.index-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--text-head);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.index-hero p {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 560px;
  line-height: 1.7;
}

/* ── Article List ─────────────────────────────── */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.article-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
  border-radius: 4px;
  margin: 0 -1rem;
  padding-left: 1rem;
  padding-right: 1rem;
}
.article-card:hover { background: var(--bg-hover); }
.article-card:hover .card-arrow { transform: translateX(4px); color: var(--accent); }

.card-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  padding-top: 0.35rem;
  min-width: 2rem;
  user-select: none;
}

.card-body { flex: 1; }

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-head);
  line-height: 1.25;
  margin-bottom: 0.4rem;
  letter-spacing: -0.01em;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
  margin-top: 0.6rem;
  letter-spacing: 0.03em;
}

.card-arrow {
  font-size: 1.1rem;
  color: var(--border);
  padding-top: 0.3rem;
  transition: transform 0.2s, color 0.2s;
}

/* ── Article Page ─────────────────────────────── */
.article-back {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 2.5rem;
  transition: color 0.2s;
}
.article-back:hover { color: var(--accent); }

.article-header {
  margin-bottom: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
}

.article-header .card-tags { margin-bottom: 1rem; }

.article-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 700;
  color: var(--text-head);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.article-subtitle {
  font-size: 1.2rem;
  color: var(--text-dim);
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.article-meta span { display: flex; align-items: center; gap: 0.3rem; }

/* ── Article Body ─────────────────────────────── */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
}

/* Placeholder box */
.content-placeholder {
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-left: 3px solid var(--accent-dim);
  border-radius: 6px;
  padding: 2.5rem 2rem;
  margin: 2.5rem 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.8;
  letter-spacing: 0.02em;
}
.content-placeholder .ph-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-dim);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.content-placeholder .ph-label::before {
  content: '//';
  color: var(--text-dim);
}

/* Section placeholders */
.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-head);
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.article-body h2::before {
  content: '##';
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-dim);
  margin-right: 0.6rem;
  vertical-align: middle;
  font-weight: 400;
}

.article-body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-head);
  margin: 2rem 0 0.6rem;
  letter-spacing: -0.01em;
}

.article-body p {
  margin-bottom: 1.25rem;
  color: var(--text);
}

.article-body ul, .article-body ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
  color: var(--text);
}
.article-body li { margin-bottom: 0.4rem; }

.article-body a {
  color: var(--accent);
  text-underline-offset: 3px;
}
.article-body a:hover { text-decoration: none; }

.article-body strong { color: var(--text-head); font-weight: 600; }
.article-body em { font-style: italic; color: var(--text); }

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-dim);
  font-style: italic;
}

/* Code blocks */
.article-body pre {
  background: #0a0b0d;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.article-body pre code {
  display: block;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: #c9d1d9;
  white-space: pre;
}

.article-body code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: #1a1c22;
  color: var(--accent);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--border);
}

/* Image in article */
.article-body img,
.article-img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid var(--border);
  display: block;
  margin: 2rem auto;
}
.img-caption {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: -1.25rem;
  margin-bottom: 2rem;
  letter-spacing: 0.03em;
}

/* Info / warning callouts */
.callout {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}
.callout-warn { border-left-color: #d4a017; }
.callout-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

/* Table of contents */
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin: 0 0 2.5rem;
  font-size: 0.92rem;
}
.toc-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}
.toc ol { margin: 0; padding-left: 1.25rem; color: var(--text-dim); }
.toc li { margin-bottom: 0.25rem; }
.toc a { color: var(--text-dim); text-decoration: none; }
.toc a:hover { color: var(--accent); }

/* ── Responsive ───────────────────────────────── */
@media (max-width: 600px) {
  .site-header .site-wrap { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
  .article-card { gap: 1rem; }
  .card-num { display: none; }
}