/* ==========================================================================
   deepusoman.com — Engineering Notes
   Visual identity: the engineer's field notebook.
   Drafting-navy ground, annotation-amber accent, blueprint-blue secondary;
   Fraunces display over IBM Plex Sans, with Plex Mono as the annotation voice.
   Light theme = graph paper. Dark theme = night drafting table.
   ========================================================================== */

:root {
  /* ground — neutral charcoal so red + black read as the ExpertAims brand */
  --bg: #17181b;
  --bg-raised: #1e2024;
  --bg-card: #212327;
  --bg-inset: #131417;
  --grid-line: rgba(255, 255, 255, 0.038);
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.24);
  /* ink */
  --ink: #f2efec;
  --ink-soft: #bdb9b4;
  --ink-faint: #8d8983;
  /* voice — ExpertAims red is the one bold thing */
  --accent: #E11D26;
  --accent-ink: #ffffff;
  --accent-soft: rgba(225, 29, 38, 0.14);
  --blue: #a6adb5;            /* neutral secondary — icon tints */
  --blue-soft: rgba(255, 255, 255, 0.055);
  --ok: #4fb783;
  --code-bg: #101113;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.32);
  --radius: 12px;
  --radius-sm: 8px;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --wrap: 1180px;
  --wrap-article: 760px;
}

html[data-theme="light"] {
  --bg: #faf9f8;
  --bg-raised: #ffffff;
  --bg-card: #ffffff;
  --bg-inset: #f2efed;
  --grid-line: rgba(158, 0, 0, 0.045);
  --line: rgba(26, 22, 20, 0.12);
  --line-strong: rgba(26, 22, 20, 0.26);
  --ink: #1c1a19;
  --ink-soft: #55504c;
  --ink-faint: #837c77;
  --accent: #9E0000;          /* exact ExpertAims deep red */
  --accent-ink: #ffffff;
  --accent-soft: rgba(158, 0, 0, 0.08);
  --blue: #6d7378;
  --blue-soft: rgba(0, 0, 0, 0.05);
  --ok: #10794f;
  --code-bg: #212327;
  --shadow: 0 20px 48px rgba(26, 22, 20, 0.12);
  --shadow-sm: 0 6px 18px rgba(26, 22, 20, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.72;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.3s ease, color 0.3s ease;
}

img { max-width: 100%; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 620;
  line-height: 1.16;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
h4 { font-family: var(--font-body); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* Accessibility ---------------------------------------------------- */
.skip {
  position: absolute; left: 16px; top: -60px; z-index: 500;
  background: var(--accent); color: var(--accent-ink);
  font: 600 0.85rem var(--font-body); padding: 10px 18px; border-radius: 0 0 8px 8px;
  transition: top 0.15s ease;
}
.skip:focus { top: 0; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* Reading progress -------------------------------------------------- */
#progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--accent);
  z-index: 300;
}

/* ------------------------------------------------------------------ */
/* Header                                                              */
/* ------------------------------------------------------------------ */
.site-header {
  position: sticky; top: 0; z-index: 200;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.25s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.nav { display: flex; align-items: center; gap: 26px; height: 66px; }

.brand {
  display: flex; align-items: center; gap: 11px;
  color: var(--ink); font-family: var(--font-display);
  font-weight: 620; font-size: 1.1rem; letter-spacing: 0;
}
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 36px; height: 36px; border-radius: 8px; flex: 0 0 36px;
  display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink);
  font: 700 0.8rem var(--font-mono); letter-spacing: 0.02em;
}
.brand .brand-mark { width: 36px; height: 36px; flex: 0 0 36px; display: block; border-radius: 8px; }
.brand small {
  display: block; font: 500 0.62rem var(--font-mono);
  color: var(--ink-faint); letter-spacing: 0.18em; text-transform: uppercase;
}

nav.main-nav { display: contents; }
.nav-links { display: flex; gap: 2px; margin-left: auto; align-items: center; list-style: none; }
.nav-links a {
  position: relative;
  color: var(--ink-soft); font-size: 0.92rem; font-weight: 500;
  padding: 8px 13px; border-radius: 7px;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-inset); text-decoration: none; }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 3px;
  height: 2px; background: var(--accent); border-radius: 2px;
}

.icon-btn {
  border: 1px solid var(--line); background: transparent; color: var(--ink-soft);
  width: 38px; height: 38px; border-radius: 9px; cursor: pointer;
  display: grid; place-items: center; font-size: 1rem;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.icon-btn:hover { color: var(--ink); border-color: var(--line-strong); }

.nav-toggle { display: none; }

@media (max-width: 900px) {
  .nav-toggle { display: grid; margin-left: auto; }
  .nav-links {
    display: none; position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--bg-raised); border-bottom: 1px solid var(--line);
    padding: 12px 18px 18px; margin: 0; box-shadow: var(--shadow-sm);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-links a.active::after { display: none; }
  .nav-links a.active { color: var(--accent); }
  .nav .icon-btn.theme { margin-left: 8px; }
}

/* ------------------------------------------------------------------ */
/* Blueprint grid texture (heroes)                                     */
/* ------------------------------------------------------------------ */
.hero, .page-hero {
  position: relative; overflow: hidden;
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
}
.hero::after, .page-hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(900px 420px at 70% -10%, color-mix(in srgb, var(--blue) 9%, transparent), transparent 70%);
}
.hero > .wrap, .page-hero > .wrap { position: relative; z-index: 1; }

/* Hero -------------------------------------------------------------- */
.hero { padding: 88px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: 1.22fr 0.78fr; gap: 56px; align-items: center; }

.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 0.72rem var(--font-mono); letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 20px;
}
.kicker::before { content: ""; width: 28px; height: 1px; background: var(--accent); }

.hero h1 {
  font-size: clamp(2.2rem, 4.8vw, 3.55rem);
  font-weight: 640;
  margin-bottom: 22px;
}
.hero h1 .grad { color: var(--accent); font-style: italic; font-weight: 560; }

.hero p.lede { color: var(--ink-soft); font-size: 1.12rem; max-width: 54ch; margin-bottom: 32px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

/* Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font: 600 0.94rem var(--font-body);
  padding: 13px 24px; border-radius: 9px; cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--accent); color: var(--accent-ink);
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 24%, transparent);
}
.btn-primary:hover { box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 32%, transparent); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn-ghost:hover { background: var(--bg-inset); border-color: var(--ink-faint); }

/* Terminal card ------------------------------------------------------ */
.hero-card {
  background: #141518; border: 1px solid var(--line-strong); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
}
html[data-theme="light"] .hero-card { background: #141518; border-color: rgba(255,255,255,0.16); }
html[data-theme="light"] .tag, html[data-theme="light"] .cert-code { color: #964a07; }
.hero-card .term-head {
  display: flex; align-items: center; gap: 7px; padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.10); background: rgba(255, 255, 255, 0.03);
}
.term-head i { width: 10px; height: 10px; border-radius: 50%; display: block; }
.term-head i:nth-child(1) { background: #ff6b6b; }
.term-head i:nth-child(2) { background: #ffd43b; }
.term-head i:nth-child(3) { background: #63d8a2; }
.term-head span { margin-left: auto; font: 500 0.7rem var(--font-mono); color: #8d8983; }
.hero-card pre {
  padding: 20px 22px; font: 400 0.8rem/1.8 var(--font-mono); color: #cfcac4;
  overflow-x: auto; white-space: pre;
}
.hero-card pre .c { color: #7d7873; }
.hero-card pre .k { color: #E85C4A; }
.hero-card pre .s { color: #ddd7d0; }
.hero-card pre .v { color: #9a938c; }

.hero-stats { display: flex; gap: 38px; margin-top: 38px; flex-wrap: wrap; }
.hero-stats .stat b {
  display: block; font: 640 1.6rem var(--font-display); color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.hero-stats .stat span { font: 400 0.72rem var(--font-mono); color: var(--ink-faint); letter-spacing: 0.06em; text-transform: uppercase; }

@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding: 56px 0 50px; }
}

/* ------------------------------------------------------------------ */
/* Sections                                                            */
/* ------------------------------------------------------------------ */
.section { padding: 68px 0; }
.section.tint { background: var(--bg-raised); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 36px; flex-wrap: wrap; }
.section-head h2 { font-size: 1.75rem; }
.section-head p { color: var(--ink-faint); font-size: 0.94rem; margin-top: 8px; }
.section-head .more { font: 500 0.85rem var(--font-mono); white-space: nowrap; }

/* ------------------------------------------------------------------ */
/* Post cards                                                          */
/* ------------------------------------------------------------------ */
.grid { display: grid; gap: 22px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 960px) { .grid.cols-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; } }

.post-card {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; display: flex; flex-direction: column; gap: 13px;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.post-card::before {
  content: ""; position: absolute; top: -1px; left: 26px; right: auto; width: 44px; height: 2px;
  background: var(--accent); border-radius: 2px; opacity: 0;
  transition: opacity 0.2s ease, width 0.25s ease;
}
.post-card:hover { transform: translateY(-4px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.post-card:hover::before { opacity: 1; width: 72px; }

.post-card .tags { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font: 500 0.66rem var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft);
  padding: 4px 10px; border-radius: 4px;
}
.tag.alt { color: var(--blue); background: var(--blue-soft); }
.tag.warm { color: var(--ok); background: color-mix(in srgb, var(--ok) 11%, transparent); }

.post-card h3 { font-size: 1.22rem; font-weight: 600; }
.post-card h3 a { color: var(--ink); }
.post-card h3 a::after { content: ""; position: absolute; inset: 0; }
.post-card h3 a:hover { text-decoration: none; }
.post-card:hover h3 a { color: var(--accent); }
.post-card p { color: var(--ink-soft); font-size: 0.92rem; flex: 1; }
.post-meta {
  display: flex; align-items: center; gap: 10px;
  font: 400 0.74rem var(--font-mono); color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.post-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--ink-faint); }

.post-card.featured {
  grid-column: span 3; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center;
}
.post-card.featured .art {
  border-radius: var(--radius-sm); min-height: 230px; border: 1px solid var(--line);
  background-image:
    radial-gradient(300px 180px at 75% 80%, color-mix(in srgb, var(--blue) 16%, transparent), transparent 70%),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: auto, 24px 24px, 24px 24px;
  background-color: var(--bg-inset);
  display: grid; place-items: center;
  font-size: 3rem;
}
.post-card.featured h3 { font-size: 1.65rem; }
@media (max-width: 960px) { .post-card.featured { grid-column: span 2; grid-template-columns: 1fr; } }
@media (max-width: 640px) { .post-card.featured { grid-column: span 1; } }

/* ------------------------------------------------------------------ */
/* Chips / search                                                      */
/* ------------------------------------------------------------------ */
.chips { display: flex; gap: 10px; flex-wrap: wrap; }
.chip {
  font: 500 0.8rem var(--font-mono); color: var(--ink-soft);
  border: 1px solid var(--line-strong); border-radius: 6px;
  padding: 8px 16px; cursor: pointer; background: transparent;
  transition: all 0.15s ease;
}
.chip:hover { color: var(--ink); border-color: var(--accent); }
.chip.active { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }

.search-box {
  display: flex; align-items: center; gap: 10px;
  background: var(--bg-card); border: 1px solid var(--line-strong); border-radius: 8px;
  padding: 10px 16px; max-width: 420px; width: 100%;
  transition: border-color 0.15s ease;
}
.search-box:focus-within { border-color: var(--accent); }
.search-box input {
  border: 0; outline: 0; background: transparent; color: var(--ink);
  font: 500 0.95rem var(--font-body); width: 100%;
}
.search-box input::placeholder { color: var(--ink-faint); }

/* ------------------------------------------------------------------ */
/* Topic tiles                                                         */
/* ------------------------------------------------------------------ */
.topic-tile {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; display: flex; gap: 16px; align-items: flex-start;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.topic-tile:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); text-decoration: none; }
.topic-tile .ico {
  width: 44px; height: 44px; flex: 0 0 44px; border-radius: 9px; display: grid; place-items: center;
  font-size: 1.2rem; background: var(--blue-soft); border: 1px solid var(--line);
}
.topic-tile b { display: block; color: var(--ink); font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; margin-bottom: 4px; }
.topic-tile span { color: var(--ink-faint); font-size: 0.86rem; line-height: 1.55; display: block; }

/* ------------------------------------------------------------------ */
/* Ad slots                                                            */
/* ------------------------------------------------------------------ */
.ad-slot {
  border: 1px dashed var(--line-strong); border-radius: var(--radius-sm);
  background: var(--bg-inset);
  display: grid; place-items: center; text-align: center;
  min-height: 110px; padding: 18px; margin: 36px 0;
}
.ad-slot .ad-note { font: 500 0.66rem var(--font-mono); color: var(--ink-faint); letter-spacing: 0.14em; text-transform: uppercase; }
.ad-slot .ad-note b { display: block; font: 500 0.78rem var(--font-body); color: var(--ink-soft); letter-spacing: 0.01em; text-transform: none; margin-top: 6px; }
.ad-slot.leaderboard { min-height: 100px; }
.ad-slot.in-article { min-height: 250px; }
.ad-slot.sidebar-ad { min-height: 250px; margin: 0; }
.ad-slot ins { width: 100%; }

/* ------------------------------------------------------------------ */
/* Shop / product cards (digital products & offers)                    */
/* ------------------------------------------------------------------ */
.shop-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.4rem; margin-top: 1.6rem; }
.shop-card { display: flex; flex-direction: column; background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.shop-card__media { aspect-ratio: 16 / 10; background: var(--bg-inset); }
.shop-card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.shop-card__body { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.1rem 1.15rem 1.25rem; flex: 1; }
.shop-card__body h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.12rem; color: var(--ink); margin: 0; }
.shop-card__body p { color: var(--ink-soft); font-size: 0.9rem; line-height: 1.55; margin: 0; }
.shop-card__foot { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; margin-top: auto; padding-top: 0.5rem; }
.shop-card__price { font-family: var(--font-mono); font-weight: 600; font-size: 1.05rem; color: var(--ink); }
.shop-card__buy { white-space: nowrap; }

/* ------------------------------------------------------------------ */
/* Support / tip widget (PayPal.me / Buy Me a Coffee)                  */
/* ------------------------------------------------------------------ */
.support-widget { margin-top: 1rem; }
.support-amts { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }

/* ------------------------------------------------------------------ */
/* Newsletter                                                          */
/* ------------------------------------------------------------------ */
.newsletter {
  border: 1px solid var(--line); border-radius: var(--radius);
  background-color: var(--bg-card);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  padding: 46px; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 36px; align-items: center;
}
.newsletter h2 { font-size: 1.6rem; margin-bottom: 12px; }
.newsletter p { color: var(--ink-soft); font-size: 0.96rem; }
.newsletter form { display: flex; gap: 10px; }
.newsletter input[type="email"] {
  flex: 1; padding: 13px 16px; border-radius: 9px;
  border: 1px solid var(--line-strong); background: var(--bg-inset); color: var(--ink);
  font: 500 0.95rem var(--font-body); outline: none;
  transition: border-color 0.15s ease;
}
.newsletter input[type="email"]:focus { border-color: var(--accent); }
.newsletter .fine { font-size: 0.76rem; color: var(--ink-faint); margin-top: 10px; }
@media (max-width: 820px) { .newsletter { grid-template-columns: 1fr; padding: 32px 26px; } .newsletter form { flex-direction: column; } }

/* ------------------------------------------------------------------ */
/* Page hero (inner pages)                                             */
/* ------------------------------------------------------------------ */
.page-hero { padding: 64px 0 46px; }
.page-hero h1 { font-size: clamp(2rem, 3.8vw, 2.85rem); margin-bottom: 16px; }
.page-hero p { color: var(--ink-soft); max-width: 66ch; font-size: 1.05rem; }

/* ------------------------------------------------------------------ */
/* Article layout                                                      */
/* ------------------------------------------------------------------ */
.article-shell { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 48px; padding: 56px 0 30px; }
@media (max-width: 1020px) { .article-shell { grid-template-columns: 1fr; } .article-aside { display: none; } }

.article { max-width: var(--wrap-article); }
.article-head .tags { display: flex; gap: 8px; margin-bottom: 20px; }
.article-head h1 { font-size: clamp(1.9rem, 3.5vw, 2.7rem); margin-bottom: 20px; }
.article-head .standfirst {
  font-family: var(--font-display); font-weight: 400; font-style: italic;
  font-size: 1.2rem; line-height: 1.55; color: var(--ink-soft); margin-bottom: 26px;
}
.byline { display: flex; align-items: center; gap: 14px; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-bottom: 8px; }
.byline .avatar {
  width: 46px; height: 46px; border-radius: 50%; flex: 0 0 46px;
  background: var(--accent); color: var(--accent-ink);
  display: grid; place-items: center; font: 700 0.9rem var(--font-mono);
}
.byline b { display: block; font-size: 0.94rem; }
.byline span { font: 400 0.74rem var(--font-mono); color: var(--ink-faint); }
.byline .share { margin-left: auto; display: flex; gap: 8px; }
.byline .share a {
  width: 36px; height: 36px; border: 1px solid var(--line-strong); border-radius: 8px;
  display: grid; place-items: center; color: var(--ink-soft); font-size: 0.85rem;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.byline .share a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.article-body h2 {
  font-size: 1.55rem; margin: 48px 0 18px;
  padding-top: 26px; border-top: 1px solid var(--line);
}
.article-body h3 { font-size: 1.2rem; margin: 34px 0 12px; }
.article-body p { margin: 0 0 18px; color: color-mix(in srgb, var(--ink) 90%, var(--ink-soft)); }
.article-body ul, .article-body ol { margin: 0 0 18px 22px; color: color-mix(in srgb, var(--ink) 90%, var(--ink-soft)); }
.article-body li { margin-bottom: 9px; }
.article-body li::marker { color: var(--accent); }
.article-body strong { color: var(--ink); }
.article-body a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--blue) 45%, transparent); }
.article-body a:hover { text-decoration-color: var(--blue); }

.article-body blockquote {
  border-left: 2px solid var(--accent); background: var(--bg-inset);
  padding: 20px 24px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 28px 0;
}
.article-body blockquote p {
  font-family: var(--font-display); font-style: italic; font-weight: 400;
  font-size: 1.08rem; line-height: 1.6; color: var(--ink-soft);
}
.article-body blockquote p:last-child { margin-bottom: 0; }

.article-body pre {
  position: relative;
  background: var(--code-bg); color: #dbe4f3;
  border: 1px solid rgba(154, 178, 211, 0.16); border-radius: var(--radius-sm);
  padding: 20px 22px; overflow-x: auto; margin: 24px 0;
  font: 400 0.84rem/1.7 var(--font-mono);
}
.copy-btn {
  position: absolute; top: 10px; right: 10px;
  font: 500 0.66rem var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: #a9b9d0; background: rgba(154, 178, 211, 0.1);
  border: 1px solid rgba(154, 178, 211, 0.2); border-radius: 6px;
  padding: 5px 10px; cursor: pointer; opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}
.article-body pre:hover .copy-btn, .copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: #ffa94d; }
.copy-btn.done { color: #63d8a2; opacity: 1; }

.article-body code { font-family: var(--font-mono); font-size: 0.86em; }
.article-body p code, .article-body li code {
  background: var(--bg-inset); border: 1px solid var(--line);
  padding: 2px 7px; border-radius: 5px; color: var(--accent);
}
.article-body pre .c { color: #7d7873; }
.article-body pre .k { color: #E85C4A; }
.article-body pre .s { color: #ddd7d0; }
.article-body pre .v { color: #9a938c; }
.article-body pre .f { color: #ffd43b; }

.callout {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: var(--radius-sm); padding: 18px 20px; margin: 26px 0;
}
.callout .ci { font-size: 1.15rem; line-height: 1.5; }
.callout p { margin: 0; font-size: 0.94rem; }

.table-scroll { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: var(--radius-sm); }
.article-body table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 0.9rem; }
.article-body th, .article-body td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.article-body th {
  background: var(--bg-inset);
  font: 500 0.7rem var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-soft);
}
.article-body td { font-variant-numeric: tabular-nums; }
.article-body tr:last-child td { border-bottom: 0; }

/* Aside / TOC -------------------------------------------------------- */
.article-aside { position: relative; }
.aside-sticky { position: sticky; top: 90px; display: flex; flex-direction: column; gap: 26px; }
.toc {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px;
}
.toc h4 { font: 500 0.68rem var(--font-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 14px; }
.toc ol { list-style: none; display: flex; flex-direction: column; gap: 3px; }
.toc a {
  display: block; color: var(--ink-soft); font-size: 0.87rem; padding: 6px 12px;
  border-left: 2px solid var(--line);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.toc a:hover, .toc a.current { color: var(--accent); border-left-color: var(--accent); text-decoration: none; }

/* Author box --------------------------------------------------------- */
.author-box {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; margin: 44px 0 10px;
}
.author-box .avatar {
  width: 64px; height: 64px; border-radius: 50%; flex: 0 0 64px;
  background: var(--accent); color: var(--accent-ink);
  display: grid; place-items: center; font: 700 1.2rem var(--font-mono);
}
.author-box h4, .author-box .author-name { font-family: var(--font-display); font-weight: 620; font-size: 1.1rem; margin-bottom: 6px; }
.author-box p { color: var(--ink-soft); font-size: 0.9rem; margin-bottom: 10px; }
.author-box .links { display: flex; gap: 16px; font: 500 0.82rem var(--font-mono); }

/* Prev / next --------------------------------------------------------- */
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 34px 0 10px; }
.post-nav a {
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 18px 20px;
  color: var(--ink); background: var(--bg-card);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.post-nav a:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.post-nav a span { display: block; font: 500 0.64rem var(--font-mono); color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 7px; }
.post-nav a b { font-family: var(--font-display); font-size: 0.98rem; font-weight: 600; }
.post-nav a.next { text-align: right; }
@media (max-width: 640px) { .post-nav { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------------ */
/* Timeline                                                            */
/* ------------------------------------------------------------------ */
.timeline { position: relative; margin-left: 10px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 1px; background: var(--line-strong); }
.tl-item { position: relative; padding: 0 0 32px 40px; }
.tl-item::before {
  content: ""; position: absolute; left: 0; top: 6px; width: 15px; height: 15px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
}
.tl-item .tl-date { font: 500 0.7rem var(--font-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.tl-item h3 { font-size: 1.15rem; margin: 8px 0 7px; }
.tl-item p { color: var(--ink-soft); font-size: 0.92rem; max-width: 70ch; }

/* ------------------------------------------------------------------ */
/* Resource cards                                                      */
/* ------------------------------------------------------------------ */
.res-card {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; display: flex; flex-direction: column; gap: 10px;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.res-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.res-card .res-top { display: flex; align-items: center; gap: 12px; }
.res-card .ico { width: 42px; height: 42px; border-radius: 9px; display: grid; place-items: center; font-size: 1.15rem; background: var(--blue-soft); border: 1px solid var(--line); }
.res-card h3 { font-size: 1.1rem; }
.res-card p { color: var(--ink-soft); font-size: 0.9rem; flex: 1; }
.res-card .res-cta { font: 500 0.84rem var(--font-mono); }
.res-card .aff { font: 500 0.62rem var(--font-mono); color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.12em; }

/* ------------------------------------------------------------------ */
/* About page                                                          */
/* ------------------------------------------------------------------ */
.about-grid { display: grid; grid-template-columns: 320px 1fr; gap: 48px; align-items: start; }
@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }
.profile-card {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; text-align: center; position: sticky; top: 90px;
}
.profile-card .big-avatar {
  width: 124px; height: 124px; border-radius: 50%; margin: 0 auto 18px;
  background: var(--accent); color: var(--accent-ink);
  display: grid; place-items: center; font: 700 2.1rem var(--font-mono);
  border: 4px solid var(--accent-soft);
}
.profile-card h2 { font-size: 1.4rem; }
.profile-card .role { color: var(--ink-faint); font: 400 0.78rem var(--font-mono); margin: 8px 0 18px; }
.profile-card .socials { display: flex; justify-content: center; gap: 10px; margin-bottom: 22px; }
.profile-card .socials a {
  width: 40px; height: 40px; border: 1px solid var(--line-strong); border-radius: 9px;
  display: grid; place-items: center; color: var(--ink-soft); font-size: 0.95rem;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.profile-card .socials a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.skill-bars { display: flex; flex-direction: column; gap: 14px; text-align: left; }
.skill-bars .sk span { display: flex; justify-content: space-between; font-size: 0.82rem; color: var(--ink-soft); margin-bottom: 6px; }
.skill-bars .sk em { font: 400 0.68rem var(--font-mono); color: var(--ink-faint); font-style: normal; }
.skill-bars .bar { height: 6px; border-radius: 99px; background: var(--bg-inset); overflow: hidden; }
.skill-bars .bar i { display: block; height: 100%; border-radius: 99px; background: var(--accent); }

.prose h2 { font-size: 1.5rem; margin: 40px 0 16px; }
.prose h2:first-child { margin-top: 0; }
.prose p { color: color-mix(in srgb, var(--ink) 90%, var(--ink-soft)); margin-bottom: 16px; }
.prose ul { margin: 0 0 16px 22px; color: color-mix(in srgb, var(--ink) 90%, var(--ink-soft)); }
.prose li { margin-bottom: 9px; }
.prose li::marker { color: var(--accent); }

.badge-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 22px 0; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-strong); border-radius: 8px; padding: 10px 16px;
  font: 500 0.82rem var(--font-body); color: var(--ink-soft); background: var(--bg-card);
}
.badge i { font-style: normal; }

/* ------------------------------------------------------------------ */
/* Contact                                                             */
/* ------------------------------------------------------------------ */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 44px; align-items: start; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-list { display: flex; flex-direction: column; gap: 16px; }
.contact-list a.item, .contact-list .item {
  display: flex; gap: 16px; align-items: center;
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 18px 20px; color: var(--ink);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.contact-list a.item:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.contact-list .ico { width: 42px; height: 42px; border-radius: 9px; flex: 0 0 42px; display: grid; place-items: center; background: var(--blue-soft); border: 1px solid var(--line); font-size: 1.05rem; }
.contact-list b { display: block; font-size: 0.95rem; }
.contact-list span { font-size: 0.82rem; color: var(--ink-faint); }

.form-card { background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; }
.form-card h2 { font-size: 1.4rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.field { margin-bottom: 16px; }
.field label { display: block; font: 500 0.72rem var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px; border-radius: 8px;
  border: 1px solid var(--line-strong); background: var(--bg-inset); color: var(--ink);
  font: 500 0.94rem var(--font-body); outline: none;
  transition: border-color 0.15s ease;
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--accent); }
.field textarea { min-height: 130px; resize: vertical; }

/* ------------------------------------------------------------------ */
/* Footer                                                              */
/* ------------------------------------------------------------------ */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-raised); margin-top: 70px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding: 54px 0 40px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid h4, .footer-grid .footer-heading { font: 500 0.68rem var(--font-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 16px; }
.footer-grid ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-grid a { color: var(--ink-soft); font-size: 0.9rem; }
.footer-grid a:hover { color: var(--accent); }
.footer-about p { color: var(--ink-soft); font-size: 0.9rem; max-width: 34ch; margin-top: 14px; }
.footer-bottom {
  border-top: 1px solid var(--line); padding: 20px 0;
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  font-size: 0.8rem; color: var(--ink-faint);
}
.footer-bottom a { color: var(--ink-soft); text-decoration: underline; text-underline-offset: 3px; }
.tl-item p a, .prose p a, .fine a, .newsletter .fine a, p.muted a { text-decoration: underline; text-underline-offset: 3px; }

/* Back to top -------------------------------------------------------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 250;
  width: 44px; height: 44px; border-radius: 10px;
  border: 1px solid var(--line-strong); background: var(--bg-card); color: var(--ink-soft);
  display: grid; place-items: center; font-size: 1rem; cursor: pointer;
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.15s ease, border-color 0.15s ease;
  box-shadow: var(--shadow-sm);
}
.to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top:hover { color: var(--accent); border-color: var(--accent); }

/* ------------------------------------------------------------------ */
/* Consent banner                                                      */
/* ------------------------------------------------------------------ */
.consent {
  position: fixed; left: 18px; right: 18px; bottom: 18px; z-index: 400;
  max-width: 620px; margin: 0 auto;
  background: var(--bg-card); border: 1px solid var(--line-strong); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 22px;
  display: none; gap: 18px; align-items: center; flex-wrap: wrap;
}
.consent.show { display: flex; }
.consent p { font-size: 0.85rem; color: var(--ink-soft); flex: 1 1 300px; margin: 0; }
.consent .btn { padding: 10px 18px; font-size: 0.86rem; }

/* ------------------------------------------------------------------ */
/* Reveal-on-scroll                                                    */
/* ------------------------------------------------------------------ */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Hero entrance */
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
.hero .kicker    { animation: rise 0.55s ease 0.05s backwards; }
.hero h1         { animation: rise 0.55s ease 0.15s backwards; }
.hero .lede      { animation: rise 0.55s ease 0.25s backwards; }
.hero .hero-ctas { animation: rise 0.55s ease 0.35s backwards; }
.hero .hero-stats{ animation: rise 0.55s ease 0.45s backwards; }
.hero .hero-card { animation: rise 0.6s ease 0.3s backwards; }

/* ------------------------------------------------------------------ */
/* Utilities                                                           */
/* ------------------------------------------------------------------ */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }
.center { text-align: center; }
.muted { color: var(--ink-faint); }
.pill-note {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 0.72rem var(--font-mono); letter-spacing: 0.06em; color: var(--ok);
  background: color-mix(in srgb, var(--ok) 10%, transparent);
  border-radius: 5px; padding: 6px 12px;
}
::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------------ */
/* Credentials page                                                    */
/* ------------------------------------------------------------------ */
.cert-stats { display: flex; gap: 40px; flex-wrap: wrap; margin-bottom: 30px; }
.cert-stat b {
  display: block; font: 640 2rem var(--font-display); color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.cert-stat span { font: 400 0.7rem var(--font-mono); color: var(--ink-faint); letter-spacing: 0.1em; text-transform: uppercase; }

.cert-card {
  background: var(--bg-card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; display: flex; flex-direction: column; gap: 12px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.cert-card:hover { transform: translateY(-4px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.cert-top { display: flex; align-items: center; justify-content: space-between; }
.cert-ico {
  width: 44px; height: 44px; border-radius: 9px; display: grid; place-items: center;
  font-size: 1.25rem; background: var(--blue-soft); border: 1px solid var(--line);
}
.cert-code {
  font: 500 0.7rem var(--font-mono); letter-spacing: 0.08em;
  color: var(--accent); background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  padding: 4px 10px; border-radius: 5px;
}
.cert-card h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.35; flex: 1; }
.cert-meta { display: flex; align-items: center; gap: 9px; font: 400 0.74rem var(--font-mono); color: var(--ink-faint); flex-wrap: wrap; }
.cert-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--ink-faint); }
.cert-sample {
  font: 500 0.6rem var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-faint); border: 1px dashed var(--line-strong);
  padding: 2px 8px; border-radius: 4px;
}
.cert-id {
  align-self: flex-start; display: inline-block;
  font: 500 0.72rem var(--font-mono); color: var(--accent);
  background: var(--accent-soft); border: 1px solid var(--line);
  padding: 2px 9px; border-radius: 999px; margin: 2px 0 2px;
}
.cert-verify { font: 500 0.8rem var(--font-mono); }
.cert-verify.off { color: var(--ink-faint); }

.focus-map { display: flex; flex-direction: column; gap: 16px; max-width: 640px; }
.focus-row { display: grid; grid-template-columns: 180px 1fr 48px; gap: 16px; align-items: center; }
.focus-row > span { font-size: 0.9rem; color: var(--ink-soft); }
.focus-row em { font: 400 0.76rem var(--font-mono); color: var(--ink-faint); font-style: normal; text-align: right; }
.focus-row .bar { height: 7px; border-radius: 99px; background: var(--bg-inset); border: 1px solid var(--line); overflow: hidden; }
.focus-row .bar i { display: block; height: 100%; border-radius: 99px; background: var(--accent); transition: width 0.9s cubic-bezier(0.22, 1, 0.36, 1); }
@media (max-width: 640px) { .focus-row { grid-template-columns: 1fr; gap: 6px; } .focus-row em { text-align: left; } }

/* ---- custom icon sizing ---- */
.topic-tile .ico, .cert-ico { color: var(--blue); }
.topic-tile .ico svg, .cert-ico svg { width: 22px; height: 22px; display: block; }
.post-card.featured .art svg { width: 78px; height: 78px; color: var(--blue); opacity: .85; }
.search-box svg { width: 17px; height: 17px; color: var(--ink-faint); flex: 0 0 auto; }
.profile-card .socials a svg { width: 18px; height: 18px; display: block; }

/* ---- profile focus tags (replaces skill bars) ---- */
.profile-card .focus-label { font: 500 0.66rem var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 12px; }
.focus-tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.focus-tags li { font: 500 0.8rem var(--font-body); color: var(--ink-soft); background: var(--bg-inset); border: 1px solid var(--line); border-radius: 999px; padding: 6px 13px; }

/* ---- certification-body brand chips (credentials) ---- */
.cert-top { flex-wrap: wrap; gap: 8px; }
.cert-issuer {
  display: inline-flex; align-items: center; gap: 7px;
  height: 30px; padding: 0 11px; background: #ffffff;
  border: 1px solid rgba(0,0,0,0.12); border-radius: 7px;
  font: 700 0.78rem var(--font-body); letter-spacing: -0.01em; line-height: 1;
  box-shadow: 0 1px 2px rgba(0,0,0,0.16);
}
.cert-issuer .ci-mark { display: inline-flex; align-items: center; }
.cert-issuer .ci-name { white-space: nowrap; }

/* Contact form status line */
.form-status { min-height: 1.2em; }
.form-status.ok  { color: #1f7a3f; font-weight: 500; }
.form-status.err { color: #b00020; font-weight: 500; }
.ds-contact-form .hp-field { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; overflow: hidden; }