/* ==========================================================
   PHP — Practical Home Performance
   Brand tokens + component styles
   ========================================================== */

:root,
[data-theme='light'] {
  /* Surfaces — bone/cream family */
  --color-bg: #FDFBF7;
  --color-surface: #F8F4EC;
  --color-surface-2: #F1EBDD;
  --color-surface-offset: #EDE5D3;
  --color-surface-offset-2: #E4DAC3;
  --color-surface-dynamic: #DBD0B6;
  --color-divider: #D8CFB8;
  --color-border: #C7BC9F;

  /* Text — charcoal family */
  --color-text: #121212;
  --color-text-muted: #4B463C;
  --color-text-faint: #8A857A;
  --color-text-inverse: #FDFBF7;

  /* Primary accent — Aged Brass */
  --color-primary: #B0821F;
  --color-primary-hover: #8C6716;
  --color-primary-active: #6B4F10;
  --color-primary-highlight: #E8DBB4;

  /* Secondary — Cypress Green (historic bridge) */
  --color-cypress: #5B6E5A;
  --color-cypress-hover: #465643;
  --color-cypress-active: #303C2E;
  --color-cypress-highlight: #CFD6CC;

  /* Warning / data — Deep Rust */
  --color-rust: #9C3B1C;
  --color-rust-hover: #7A2B12;
  --color-rust-active: #571C09;
  --color-rust-highlight: #E4CBBF;

  /* Success / info — muted teal-adjacent for data only */
  --color-slate: #34576B;
  --color-slate-hover: #26404F;
  --color-slate-highlight: #CBD6DC;

  /* Neutrals for chart lines / rules */
  --color-warm-gray: #8A857A;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows — tone-matched to cream */
  --shadow-sm: 0 1px 2px oklch(0.25 0.02 60 / 0.08);
  --shadow-md: 0 6px 20px oklch(0.25 0.02 60 / 0.10);
  --shadow-lg: 0 20px 48px oklch(0.20 0.02 60 / 0.16);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 1040px;
  --content-wide: 1280px;

  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 7.5rem);

  /* Spacing */
  --space-1: 0.25rem;  --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;   --space-24: 6rem;
  --space-32: 8rem;

  /* Fonts */
  --font-display: 'Fraunces', 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', 'Helvetica Neue', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

[data-theme='dark'] {
  --color-bg: #121212;
  --color-surface: #1A1815;
  --color-surface-2: #221F1A;
  --color-surface-offset: #2A2620;
  --color-surface-offset-2: #332E26;
  --color-surface-dynamic: #3D372E;
  --color-divider: #2E2A24;
  --color-border: #4A4437;

  --color-text: #FDFBF7;
  --color-text-muted: #B8B0A0;
  --color-text-faint: #6E6659;
  --color-text-inverse: #121212;

  --color-primary: #D4A93A;
  --color-primary-hover: #E4BC55;
  --color-primary-active: #F0CB6E;
  --color-primary-highlight: #3D3220;

  --color-cypress: #8FA48D;
  --color-cypress-hover: #A6BAA4;
  --color-cypress-highlight: #2E3A2C;

  --color-rust: #D66B45;
  --color-rust-hover: #E28560;
  --color-rust-highlight: #3E241A;

  --color-slate: #7FA3B8;
  --color-slate-hover: #9BB8CB;
  --color-slate-highlight: #253540;

  --color-warm-gray: #B8B0A0;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.4);
  --shadow-md: 0 6px 20px oklch(0 0 0 / 0.5);
  --shadow-lg: 0 20px 48px oklch(0 0 0 / 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #121212;
    --color-surface: #1A1815;
    --color-surface-2: #221F1A;
    --color-surface-offset: #2A2620;
    --color-text: #FDFBF7;
    --color-text-muted: #B8B0A0;
    --color-text-faint: #6E6659;
    --color-primary: #D4A93A;
    --color-primary-hover: #E4BC55;
    --color-cypress: #8FA48D;
    --color-rust: #D66B45;
    --color-slate: #7FA3B8;
    --color-border: #4A4437;
    --color-divider: #2E2A24;
  }
}

/* ---------- Layout ---------- */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-10));
}
.container-narrow { max-width: var(--content-narrow); margin-inline: auto; padding-inline: clamp(var(--space-4), 4vw, var(--space-10)); }
.container-default { max-width: var(--content-default); margin-inline: auto; padding-inline: clamp(var(--space-4), 4vw, var(--space-10)); }

section { padding-block: clamp(var(--space-12), 8vw, var(--space-32)); }

/* ---------- Typography ---------- */

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

.display {
  font-family: var(--font-display);
  font-weight: 400;
  font-optical-sizing: auto;
  font-variation-settings: "SOFT" 30, "opsz" 144;
  letter-spacing: -0.02em;
  line-height: 1.02;
}

.mono, .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }

.lede {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: 60ch;
  font-variation-settings: "SOFT" 100, "opsz" 24;
}

h1, h2 { font-family: var(--font-display); font-weight: 400; letter-spacing: -0.02em; }
h3, h4 { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.01em; }
h1 { font-size: var(--text-hero); line-height: 0.98; }
h2 { font-size: var(--text-2xl); line-height: 1.05; }
h3 { font-size: var(--text-xl); line-height: 1.15; }
h4 { font-size: var(--text-lg); line-height: 1.2; }

p { color: var(--color-text-muted); }
p.body-strong { color: var(--color-text); }

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid oklch(from var(--color-border) l c h / 0.4);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-6);
}
.brand {
  display: inline-flex; align-items: center; gap: var(--space-3);
  color: var(--color-text); text-decoration: none;
}
.brand-mark { width: 36px; height: 36px; color: var(--color-primary); }
.brand-lockup { display: flex; flex-direction: column; line-height: 1; }
.brand-name { font-family: var(--font-display); font-size: var(--text-base); font-weight: 500; letter-spacing: -0.01em; color: var(--color-text); }
.brand-tag { font-family: var(--font-body); font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.08em; text-transform: uppercase; }

.nav-links { display: none; gap: var(--space-6); list-style: none; align-items: center; }
@media (min-width: 800px) { .nav-links { display: flex; } }
.nav-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding-block: var(--space-2);
  border-bottom: 1px solid transparent;
}
.nav-links a:hover { color: var(--color-text); border-bottom-color: var(--color-primary); }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 500;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1px solid transparent;
  line-height: 1;
}
.btn-primary { background: var(--color-primary); color: #121212; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-ghost { color: var(--color-text); border-color: var(--color-border); background: transparent; }
.btn-ghost:hover { background: var(--color-surface); border-color: var(--color-text); }
.btn-lg { padding: var(--space-4) var(--space-6); font-size: var(--text-base); }
.btn-arrow { display: inline-flex; align-items: center; gap: var(--space-2); color: var(--color-primary); font-weight: 500; text-decoration: none; font-size: var(--text-sm); }
.btn-arrow::after { content: "→"; transition: transform var(--transition-interactive); }
.btn-arrow:hover::after { transform: translateX(4px); }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text); }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding-block: clamp(var(--space-16), 12vw, var(--space-32));
  overflow: hidden;
}
.hero-inner { position: relative; z-index: 2; display: grid; gap: var(--space-8); }
@media (min-width: 900px) {
  .hero-inner { grid-template-columns: 1.15fr 0.85fr; align-items: end; gap: var(--space-16); }
}
.hero h1 { max-width: 14ch; }
.hero h1 em { font-style: italic; color: var(--color-primary); font-weight: 400; }
.hero .lede { margin-top: var(--space-6); max-width: 46ch; }
.hero-actions { display: flex; gap: var(--space-4); margin-top: var(--space-8); flex-wrap: wrap; }

.hero-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.hero-visual img { width: 100%; height: 100%; object-fit: cover; }
.hero-visual::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, oklch(0.15 0.02 60 / 0.55) 100%);
  pointer-events: none;
}

.hero-metrics {
  position: absolute;
  left: var(--space-4); right: var(--space-4); bottom: var(--space-4);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: oklch(0.15 0.02 60 / 0.6);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(8px);
}
.hero-metric { padding: var(--space-3) var(--space-4); background: oklch(0.15 0.02 60 / 0.75); color: #FDFBF7; }
.hero-metric-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.12em; color: #C7BC9F; }
.hero-metric-value { font-family: var(--font-mono); font-size: var(--text-lg); color: var(--color-primary); margin-top: 2px; }

/* Editorial rule under hero */
.hero-tags {
  display: flex; flex-wrap: wrap; gap: var(--space-4);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-faint);
}
.hero-tags span { display: inline-flex; align-items: center; gap: var(--space-2); }
.hero-tags span::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--color-cypress); }

/* ---------- Section heading ---------- */

.section-head { display: grid; gap: var(--space-4); margin-bottom: var(--space-12); max-width: 60ch; }
.section-head h2 em { font-style: italic; color: var(--color-primary); font-weight: 400; }

/* ---------- Six-topic grid ---------- */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
}
.topic-card {
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: grid; gap: var(--space-4);
  position: relative;
  transition: border-color var(--transition-interactive), transform var(--transition-interactive);
}
.topic-card:hover { border-color: var(--color-primary); transform: translateY(-2px); }
.topic-num {
  font-family: var(--font-mono); font-size: var(--text-xs);
  color: var(--color-primary); letter-spacing: 0.14em;
}
.topic-card h3 { font-size: var(--text-lg); font-weight: 500; color: var(--color-text); }
.topic-card p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Data strip (the math surface) ---------- */

.data-strip {
  background: var(--color-text);
  color: var(--color-text-inverse);
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
}
.data-strip .container { display: grid; gap: var(--space-12); }
@media (min-width: 900px) { .data-strip .container { grid-template-columns: 0.9fr 1.1fr; align-items: center; } }
.data-strip h2 { color: var(--color-text-inverse); }
.data-strip h2 em { color: var(--color-primary); font-style: italic; }
.data-strip .lede { color: oklch(0.85 0.02 80); }

.metric-panel {
  background: oklch(0.18 0.01 80);
  border: 1px solid oklch(0.28 0.02 80);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: grid; gap: var(--space-6);
}
.metric-row {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid oklch(0.28 0.02 80);
}
.metric-row:last-child { border-bottom: none; padding-bottom: 0; }
.metric-key { font-size: var(--text-sm); color: oklch(0.75 0.02 80); }
.metric-val { font-family: var(--font-mono); font-size: var(--text-xl); color: var(--color-primary); }
.metric-val small { font-size: 0.55em; color: oklch(0.75 0.02 80); margin-left: 4px; font-family: var(--font-body); text-transform: uppercase; letter-spacing: 0.08em; }
.metric-note { font-size: var(--text-xs); color: oklch(0.65 0.02 80); font-family: var(--font-mono); }

/* ---------- Split section — historic focus ---------- */

.split {
  display: grid; gap: var(--space-12);
  align-items: center;
}
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; gap: var(--space-16); } }
.split-image {
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
}
.split-image img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(0.15) contrast(1.05); }
.split-text .quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--color-text);
  border-left: 2px solid var(--color-primary);
  padding-left: var(--space-6);
  margin-top: var(--space-6);
  max-width: 46ch;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-16);
  background: var(--color-surface);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}
.footer-grid h5 { font-family: var(--font-body); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-text-faint); margin-bottom: var(--space-4); font-weight: 600; }
.footer-grid ul { list-style: none; display: grid; gap: var(--space-2); }
.footer-grid a { color: var(--color-text-muted); text-decoration: none; font-size: var(--text-sm); }
.footer-grid a:hover { color: var(--color-primary); }
.footer-bottom {
  display: flex; justify-content: space-between; gap: var(--space-6); flex-wrap: wrap;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ==========================================================
   STYLE GUIDE — additional components
   ========================================================== */

.sg-hero {
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
  border-bottom: 1px solid var(--color-border);
}
.sg-hero .display { font-size: var(--text-3xl); max-width: 18ch; }
.sg-hero .lede { margin-top: var(--space-6); }

.sg-section-title {
  display: flex; align-items: baseline; gap: var(--space-4);
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.sg-section-title .sg-index { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-primary); }
.sg-section-title h2 { font-size: var(--text-xl); }

.swatch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--space-4); }
.swatch {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}
.swatch-chip { height: 140px; }
.swatch-meta { padding: var(--space-4); display: grid; gap: 2px; }
.swatch-name { font-size: var(--text-sm); color: var(--color-text); font-weight: 500; }
.swatch-role { font-size: var(--text-xs); color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.1em; }
.swatch-hex { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-2); }

.type-row {
  display: grid; gap: var(--space-3);
  padding-block: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}
.type-row:last-child { border-bottom: none; }
.type-meta { display: flex; gap: var(--space-4); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.08em; }
.type-sample { color: var(--color-text); }

.usage-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--space-6); }
.usage-card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.usage-card h4 { font-size: var(--text-base); margin-bottom: var(--space-3); color: var(--color-text); font-weight: 600; font-family: var(--font-body); }
.usage-card.do { border-left: 3px solid var(--color-cypress); }
.usage-card.dont { border-left: 3px solid var(--color-rust); }
.usage-card p { font-size: var(--text-sm); }
.usage-tag { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.12em; margin-bottom: var(--space-2); display: inline-block; }
.usage-card.do .usage-tag { color: var(--color-cypress); }
.usage-card.dont .usage-tag { color: var(--color-rust); }

.component-demo {
  padding: var(--space-10);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center;
}

.token-table { width: 100%; font-family: var(--font-mono); font-size: var(--text-xs); }
.token-table th, .token-table td { text-align: left; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-divider); }
.token-table th { color: var(--color-text-faint); text-transform: uppercase; letter-spacing: 0.1em; font-weight: 500; }
.token-table td.val { color: var(--color-primary); }

.principle-list { display: grid; gap: var(--space-6); counter-reset: p; }
.principle {
  display: grid; grid-template-columns: auto 1fr; gap: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}
.principle:last-child { border-bottom: none; }
.principle::before {
  counter-increment: p;
  content: "0" counter(p);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--color-primary);
  align-self: start;
}
.principle h4 { font-size: var(--text-lg); margin-bottom: var(--space-2); font-family: var(--font-display); font-weight: 500; }
.principle p { font-size: var(--text-sm); }

/* =========================================================
   BLOG — listing + article typography
   ========================================================= */

/* ---------- Blog listing ---------- */

.blog-hero { padding-block: clamp(var(--space-16), 10vw, var(--space-24)); border-bottom: 1px solid var(--color-divider); }
.blog-hero .display { font-size: var(--text-2xl); margin-block: var(--space-4) var(--space-4); }
.blog-hero p { font-size: var(--text-base); color: var(--color-text-muted); max-width: 60ch; }

.post-grid {
  display: grid;
  gap: var(--space-10);
  grid-template-columns: 1fr;
}
@media (min-width: 720px) { .post-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-12); } }
@media (min-width: 1100px) { .post-grid { grid-template-columns: repeat(3, 1fr); } }

.post-card {
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
  background: transparent;
}
.post-card .thumb {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  margin-bottom: var(--space-5);
  transform: rotate(-0.4deg);
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.post-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 600ms cubic-bezier(0.16, 1, 0.3, 1); }
.post-card:hover .thumb { transform: rotate(0deg); box-shadow: var(--shadow-md); }
.post-card:hover .thumb img { transform: scale(1.03); }

.post-card .eyebrow { margin-bottom: var(--space-2); }
.post-card h3 {
  font-family: var(--font-display); font-weight: 400; font-size: var(--text-lg);
  color: var(--color-text); margin-bottom: var(--space-2); letter-spacing: -0.01em;
}
.post-card .excerpt { font-size: var(--text-sm); color: var(--color-text-muted); }
.post-card .meta { margin-top: var(--space-3); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.04em; }

/* ---------- Article ---------- */

.article-hero {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20)) clamp(var(--space-6), 4vw, var(--space-10));
}
.article-hero .eyebrow { margin-bottom: var(--space-4); }
.article-hero h1 {
  font-family: var(--font-display); font-weight: 400;
  font-size: var(--text-2xl); line-height: 1.05; letter-spacing: -0.02em;
  color: var(--color-text);
  max-width: 22ch;
  margin-bottom: var(--space-6);
}
.article-hero .lede { max-width: 60ch; }
.article-meta {
  display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-6);
  margin-top: var(--space-8);
  font-family: var(--font-mono); font-size: var(--text-xs);
  color: var(--color-text-faint); letter-spacing: 0.06em; text-transform: uppercase;
}
.article-meta span { display: inline-flex; align-items: center; gap: var(--space-2); }
.article-meta strong { color: var(--color-text-muted); font-weight: 500; }

.article-hero-image {
  margin-block: clamp(var(--space-8), 5vw, var(--space-12));
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-divider);
  background: var(--color-surface-2);
  aspect-ratio: 16 / 9;
}
.article-hero-image img { width: 100%; height: 100%; object-fit: cover; }

/* Article body — readable narrow column */
.article-body {
  max-width: var(--content-narrow);
  margin-inline: auto;
  padding-block: clamp(var(--space-8), 5vw, var(--space-16));
}
.article-body > * + * { margin-top: var(--space-5); }
.article-body p {
  font-family: var(--font-body); font-size: 1.075rem; line-height: 1.75;
  color: var(--color-text); max-width: 68ch;
}
.article-body h2 {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--text-xl); line-height: 1.15; letter-spacing: -0.01em;
  color: var(--color-text);
  margin-top: var(--space-16); margin-bottom: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
}
.article-body h2:first-child, .article-body > h2:first-of-type { border-top: none; padding-top: 0; margin-top: var(--space-8); }
.article-body h3 {
  font-family: var(--font-display); font-weight: 500;
  font-size: var(--text-lg); line-height: 1.2; letter-spacing: -0.01em;
  color: var(--color-text);
  margin-top: var(--space-10); margin-bottom: var(--space-3);
}
.article-body h4 {
  font-family: var(--font-body); font-weight: 600;
  font-size: var(--text-base); line-height: 1.35; letter-spacing: 0;
  color: var(--color-text);
  margin-top: var(--space-8); margin-bottom: var(--space-2);
}
.article-body a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.article-body a:hover { color: var(--color-primary-hover); text-decoration-thickness: 2px; }
.article-body strong { color: var(--color-text); font-weight: 600; }
.article-body em { font-style: italic; }

.article-body blockquote {
  border-left: 2px solid var(--color-primary);
  padding: var(--space-2) 0 var(--space-2) var(--space-5);
  margin: var(--space-8) 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.article-body blockquote em { font-style: italic; }

/* Figures */
.article-body figure {
  margin-block: var(--space-10);
  margin-inline: auto;
  max-width: 100%;
}
.article-body figure img {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  background: var(--color-surface-2);
}
.article-body figcaption {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-text-faint);
  text-align: center;
}

/* Nerd Note callout — PHP-branded */
.nerd-note {
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-2);
  padding: var(--space-5) var(--space-6);
  margin-block: var(--space-10);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-primary);
}
.nerd-note-title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.nerd-note p {
  font-family: var(--font-body); font-size: 1rem; line-height: 1.7;
  color: var(--color-text-muted);
  margin: var(--space-3) 0;
}
.nerd-note p:first-of-type { margin-top: 0; }
.nerd-note p:last-of-type { margin-bottom: 0; }

/* FAQ */
.article-faq { margin-block: var(--space-10); }
.faq-item { border-top: 1px solid var(--color-divider); padding-block: var(--space-5); }
.faq-item:last-child { border-bottom: 1px solid var(--color-divider); }
.faq-item h4 {
  font-family: var(--font-display); font-weight: 500; font-size: var(--text-base);
  color: var(--color-text); margin-bottom: var(--space-2);
  letter-spacing: -0.005em;
}
.faq-item p { font-size: 1rem; color: var(--color-text-muted); }

/* References */
.references-list {
  list-style: none; padding: 0; margin-top: var(--space-4);
  font-family: var(--font-body); font-size: var(--text-sm); line-height: 1.7;
  color: var(--color-text-muted);
}
.references-list li {
  padding-block: var(--space-2);
  border-bottom: 1px dotted var(--color-divider);
  max-width: 68ch;
}
.references-list li:last-child { border-bottom: none; }

/* Article footer */
.article-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-10);
  margin-top: var(--space-12);
}
.article-footer .byline {
  font-family: var(--font-mono); font-size: var(--text-xs);
  color: var(--color-text-faint); letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: var(--space-4);
}
.article-footer .back-link { font-family: var(--font-body); font-size: var(--text-sm); }

/* Homepage: Latest writing strip */
.latest-writing { background: var(--color-surface); border-block: 1px solid var(--color-divider); }
.latest-writing .section-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: var(--space-8); flex-wrap: wrap; gap: var(--space-4); }
.latest-writing .section-head h2 { font-size: var(--text-xl); }