/* Kestrion Consulting — design system v2.
   Premium dark-first: amber signature gradient, glass cards, glow accents.
   Zero dependencies. Theme via CSS custom properties + [data-theme]. */

:root {
  /* dark is the house style */
  --bg: #0b0c10;
  --bg-elev: #12141a;
  --bg-glass: rgba(255, 255, 255, .03);
  --bg-inset: #1a1d25;
  --text: #f2f1ee;
  --muted: #a7a9b3;
  --faint: #6d707c;
  --accent: #f5a623;
  --accent-2: #ff6b35;
  --accent-soft: rgba(245, 166, 35, .12);
  --accent-contrast: #14120c;
  --border: rgba(255, 255, 255, .08);
  --border-strong: rgba(255, 255, 255, .16);
  --code-bg: #14161d;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
  --glow: 0 0 80px rgba(245, 166, 35, .18);
  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 16px 48px rgba(0,0,0,.4);
  --grad: linear-gradient(96deg, var(--accent), var(--accent-2));
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fdfcfa;
    --bg-elev: #ffffff;
    --bg-glass: rgba(20, 18, 12, .025);
    --bg-inset: #f0eee9;
    --text: #171613;
    --muted: #5c5a54;
    --faint: #94918a;
    --accent: #c2670a;
    --accent-2: #e2461f;
    --accent-soft: rgba(194, 103, 10, .1);
    --accent-contrast: #ffffff;
    --border: rgba(23, 22, 19, .1);
    --border-strong: rgba(23, 22, 19, .2);
    --code-bg: #f4f2ed;
    --good: #15803d; --warn: #a16207; --bad: #b91c1c;
    --glow: 0 0 80px rgba(194, 103, 10, .12);
    --shadow: 0 1px 2px rgba(23,22,19,.06), 0 16px 48px rgba(23,22,19,.08);
    color-scheme: light;
  }
}

/* Explicit toggle beats OS preference, both directions. */
:root[data-theme="dark"] {
  --bg: #0b0c10; --bg-elev: #12141a; --bg-glass: rgba(255,255,255,.03); --bg-inset: #1a1d25;
  --text: #f2f1ee; --muted: #a7a9b3; --faint: #6d707c;
  --accent: #f5a623; --accent-2: #ff6b35; --accent-soft: rgba(245,166,35,.12); --accent-contrast: #14120c;
  --border: rgba(255,255,255,.08); --border-strong: rgba(255,255,255,.16); --code-bg: #14161d;
  --good: #4ade80; --warn: #fbbf24; --bad: #f87171;
  --glow: 0 0 80px rgba(245,166,35,.18);
  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 16px 48px rgba(0,0,0,.4);
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #fdfcfa; --bg-elev: #ffffff; --bg-glass: rgba(20,18,12,.025); --bg-inset: #f0eee9;
  --text: #171613; --muted: #5c5a54; --faint: #94918a;
  --accent: #c2670a; --accent-2: #e2461f; --accent-soft: rgba(194,103,10,.1); --accent-contrast: #ffffff;
  --border: rgba(23,22,19,.1); --border-strong: rgba(23,22,19,.2); --code-bg: #f4f2ed;
  --good: #15803d; --warn: #a16207; --bad: #b91c1c;
  --glow: 0 0 80px rgba(194,103,10,.12);
  --shadow: 0 1px 2px rgba(23,22,19,.06), 0 16px 48px rgba(23,22,19,.08);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}
img, svg { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3 { line-height: 1.12; letter-spacing: -0.025em; font-weight: 750; }
h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); margin: 0 0 .5em; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); margin: 0 0 .5em; }
h3 { font-size: 1.18rem; margin: 1.8em 0 .5em; }
p { margin: 0 0 1em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.prose { max-width: 68ch; }

/* gradient keyword inside headlines */
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* rotating pain word in the hero */
.rotor-wrap { display: inline-block; }
#rotor { display: inline-block; opacity: 1; transform: none; transition: opacity .35s ease, transform .35s ease; }
#rotor.out { opacity: 0; transform: translateY(.4em); }

/* ---------- kicker pill ---------- */
.kicker {
  display: inline-flex; align-items: center; gap: .55em;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 999px;
  padding: .4em 1em;
  margin-bottom: 1.4em;
}
.kicker::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 1.4rem; min-height: 64px; }
.brand {
  font-family: var(--font-mono);
  font-weight: 700; font-size: 1rem;
  color: var(--text); letter-spacing: .02em;
  margin-right: auto;
  display: flex; align-items: center; gap: .55em;
}
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 27px; height: 27px; flex-shrink: 0;
  filter: drop-shadow(0 0 10px rgba(245, 166, 35, .35));
}
.brand .tld { color: var(--faint); font-weight: 400; }
.nav-links { display: flex; gap: 1.3rem; align-items: center; }
.nav-links a { color: var(--muted); font-size: .92rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--text); font-weight: 650; }
.nav-cta {
  background: var(--grad); color: var(--accent-contrast) !important;
  padding: .5em 1.1em; border-radius: 999px; font-weight: 700 !important;
}
.nav-cta:hover { filter: brightness(1.1); text-decoration: none; }
.theme-btn {
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: 999px; cursor: pointer;
  color: var(--muted); font-size: .9rem;
  width: 36px; height: 32px; line-height: 1;
}
.theme-btn:hover { border-color: var(--border-strong); color: var(--text); }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: clamp(4rem, 10vw, 7.5rem) 0 clamp(3rem, 7vw, 5.5rem);
  overflow: hidden;
}
.hero::before {
  /* radial glow behind the headline */
  content: "";
  position: absolute; inset: -40% -20% auto -20%; height: 130%;
  background:
    radial-gradient(600px 420px at 18% 30%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
    radial-gradient(500px 380px at 85% 65%, color-mix(in srgb, var(--accent-2) 10%, transparent), transparent 70%);
  pointer-events: none;
}
.hero::after {
  /* faint blueprint grid */
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(70% 60% at 50% 30%, rgba(0,0,0,.5), transparent);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, rgba(0,0,0,.5), transparent);
  pointer-events: none;
}
.hero .wrap { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 3.5rem; align-items: center; }
.hero h1 { max-width: 15ch; }
.hero .lede { font-size: 1.16rem; color: var(--muted); max-width: 50ch; margin-bottom: 2.2rem; }
.hero-meta {
  font-family: var(--font-mono); font-size: .76rem; color: var(--faint);
  margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: .6em 1.8em;
}
.hero-meta span::before { content: "✓ "; color: var(--good); }

/* terminal card */
.term {
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  box-shadow: var(--shadow), var(--glow);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: .8rem;
  line-height: 1.75;
}
.term-bar {
  display: flex; align-items: center; gap: .45em;
  padding: .65em 1em;
  border-bottom: 1px solid var(--border);
  background: var(--bg-glass);
}
.term-bar i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.term-bar i:nth-child(1) { background: #ff5f57; }
.term-bar i:nth-child(2) { background: #febc2e; }
.term-bar i:nth-child(3) { background: #28c840; }
.term-bar span { margin-left: auto; color: var(--faint); font-size: .72rem; }
.term-body { padding: 1.1em 1.3em; color: var(--muted); }
.term-body .cmd { color: var(--text); }
.term-body .cmd::before { content: "$ "; color: var(--accent); }
.term-body .bar-row { display: flex; justify-content: space-between; gap: 1em; }
.term-body .meter { color: var(--accent); letter-spacing: -.06em; }
.term-body .meter .off { color: var(--bg-inset); }
.term-body .score { color: var(--warn); font-weight: 700; }
.term-body .verdict { color: var(--bad); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  background: var(--grad); color: var(--accent-contrast);
  padding: .8em 1.6em; border-radius: 999px;
  font-weight: 700; font-size: 1rem; border: 1px solid transparent;
  cursor: pointer;
  box-shadow: 0 4px 24px color-mix(in srgb, var(--accent) 35%, transparent);
  transition: transform .15s ease, box-shadow .15s ease, filter .15s ease;
}
.btn:hover {
  text-decoration: none; filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: 0 8px 32px color-mix(in srgb, var(--accent) 45%, transparent);
}
.btn-ghost {
  background: var(--bg-glass); color: var(--text);
  border-color: var(--border-strong);
  box-shadow: none;
}
.btn-ghost:hover { filter: none; border-color: var(--accent); color: var(--accent); box-shadow: none; }
.cta-row { display: flex; gap: .9rem; flex-wrap: wrap; align-items: center; }

/* ---------- stats band ---------- */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px; background: var(--border);
  border: 1px solid var(--border); border-radius: 14px;
  overflow: hidden; margin-top: 3rem;
}
.stat { background: var(--bg-elev); padding: 1.4rem 1.6rem; }
.stat .n {
  font-family: var(--font-mono); font-size: 2rem; font-weight: 700;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  display: block; line-height: 1.1;
}
.stat .l { font-size: .85rem; color: var(--muted); }

/* ---------- sections ---------- */
section { padding: clamp(3rem, 8vw, 5.5rem) 0; position: relative; }
.section-alt {
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head { max-width: 62ch; margin-bottom: 2.4rem; }
.section-head h2 { margin-top: 0; }
.section-head p { color: var(--muted); font-size: 1.05rem; }

/* ---------- pain cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.card {
  position: relative;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 14px; padding: 1.5rem 1.5rem 1.4rem;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--grad); opacity: 0; transition: opacity .18s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
  box-shadow: 0 12px 40px rgba(0,0,0,.25), 0 0 40px color-mix(in srgb, var(--accent) 12%, transparent);
}
.card:hover::before { opacity: 1; }
.card .num {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em;
  color: var(--accent); text-transform: uppercase;
}
.card h3 { margin: .5rem 0 .5rem; font-size: 1.12rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .quote { font-style: italic; color: var(--text); }

/* ---------- copy/skip two-column model ---------- */
.model { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.model-col {
  border: 1px solid var(--border); border-radius: 14px;
  padding: 1.6rem 1.7rem; background: var(--bg-glass);
  position: relative; overflow: hidden;
}
.model-col::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; }
.model-copy::before { background: linear-gradient(90deg, var(--good), transparent); }
.model-skip::before { background: linear-gradient(90deg, var(--bad), transparent); }
.model-col h3 { margin-top: 0; display: flex; align-items: center; gap: .5em; font-size: 1.2rem; }
.model-col ul { margin: 1rem 0 0; padding: 0; list-style: none; }
.model-col li { padding: .55em 0 .55em 1.9em; position: relative; border-top: 1px solid var(--border); font-size: .96rem; color: var(--muted); }
.model-col li strong { color: var(--text); }
.model-col li:first-child { border-top: 0; }
.model-col li::before { position: absolute; left: 0; font-family: var(--font-mono); font-weight: 700; }
.model-copy li::before { content: "＋"; color: var(--good); }
.model-skip li::before { content: "－"; color: var(--bad); }
.model-copy h3 span { color: var(--good); }
.model-skip h3 span { color: var(--bad); }

/* ---------- article cards / lists ---------- */
.article-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.article-card {
  display: block; color: var(--text);
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.4rem 1.5rem;
  transition: transform .18s ease, border-color .18s ease;
}
.article-card:hover {
  text-decoration: none; transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}
.article-card .tag { font-family: var(--font-mono); font-size: .7rem; color: var(--accent); text-transform: uppercase; letter-spacing: .12em; }
.article-card h3 { margin: .5rem 0 .45rem; font-size: 1.08rem; line-height: 1.3; }
.article-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.article-card .more { display: inline-block; margin-top: .9rem; font-size: .85rem; font-weight: 650; color: var(--accent); }

.article-list { list-style: none; margin: 1.4rem 0 0; padding: 0; }
.article-list li { border-top: 1px solid var(--border); padding: 1.2rem 0; }
.article-list li:last-child { border-bottom: 1px solid var(--border); }
.article-list a { font-weight: 700; color: var(--text); font-size: 1.12rem; }
.article-list a:hover { color: var(--accent); }
.article-list p { margin: .35rem 0 0; color: var(--muted); font-size: .95rem; max-width: 70ch; }
.article-list .tag { font-family: var(--font-mono); font-size: .7rem; color: var(--accent); text-transform: uppercase; letter-spacing: .12em; }

/* ---------- email form ---------- */
.cta-panel {
  position: relative;
  border-radius: 18px; padding: clamp(1.8rem, 5vw, 3rem);
  background:
    radial-gradient(500px 300px at 12% 0%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%),
    var(--bg-elev);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.subscribe { display: flex; gap: .7rem; flex-wrap: wrap; margin-top: 1.4rem; max-width: 520px; }
.subscribe input[type="email"] {
  flex: 1 1 240px; min-width: 0;
  padding: .8em 1.1em; font-size: 1rem;
  border: 1px solid var(--border-strong); border-radius: 999px;
  background: var(--bg); color: var(--text);
  font-family: var(--font-sans);
}
.subscribe input[type="email"]:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.form-note { font-size: .82rem; color: var(--faint); margin-top: .8rem; }

/* ---------- article typography ---------- */
.article { padding: clamp(2.5rem, 6vw, 4rem) 0; }
.article-header { margin-bottom: 2.2rem; }
.article-header .meta { font-family: var(--font-mono); font-size: .78rem; color: var(--faint); }
.article h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
.article h2 { font-size: clamp(1.4rem, 3vw, 1.85rem); border-top: 1px solid var(--border); padding-top: 1.2em; margin-top: 2em; }
.article ul, .article ol { padding-left: 1.4em; margin: 0 0 1.1em; }
.article li { margin: .35em 0; }
.article .lede { font-size: 1.12rem; color: var(--muted); }
.article code {
  font-family: var(--font-mono); font-size: .86em;
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 5px; padding: .1em .4em;
}
.article pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.1rem 1.2rem;
  overflow-x: auto; margin: 0 0 1.2em;
  font-size: .85rem; line-height: 1.55;
}
.article pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.table-scroll { overflow-x: auto; margin: 0 0 1.2em; border: 1px solid var(--border); border-radius: 12px; }
.article table { border-collapse: collapse; width: 100%; font-size: .92rem; }
.article th, .article td { text-align: left; padding: .6em .95em; border-bottom: 1px solid var(--border); vertical-align: top; }
.article th { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); background: var(--bg-glass); }
.article tr:last-child td { border-bottom: 0; }
.article hr { border: 0; border-top: 1px solid var(--border); margin: 2.2em 0; }
.article blockquote {
  margin: 0 0 1.2em; padding: 1em 1.3em;
  border-left: 3px solid var(--accent);
  background: var(--bg-glass); border-radius: 0 12px 12px 0;
  color: var(--muted);
}
.article-footer { margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid var(--border); }

/* ---------- scorecard ---------- */
.sc-progress { position: sticky; top: 64px; z-index: 10; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); padding: .6rem 0; }
.sc-progress-inner { display: flex; align-items: center; gap: 1rem; font-family: var(--font-mono); font-size: .78rem; color: var(--muted); }
.sc-bar { flex: 1; height: 7px; background: var(--bg-inset); border-radius: 4px; overflow: hidden; }
.sc-bar-fill { height: 100%; width: 0; background: var(--grad); border-radius: 4px; transition: width .25s ease; }
.sc-cat { margin: 2.6rem 0 0; }
.sc-cat-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; border-bottom: 2px solid var(--border-strong); padding-bottom: .55rem; }
.sc-cat-head h2 { margin: 0; border: 0; padding: 0; font-size: 1.3rem; }
.sc-cat-head .sc-cat-score { font-family: var(--font-mono); font-size: .8rem; color: var(--accent); white-space: nowrap; }
.sc-q { border-bottom: 1px solid var(--border); padding: 1rem 0; display: flex; gap: 1rem; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.sc-q-text { flex: 1 1 30ch; margin: 0; font-size: .97rem; }
.sc-q-text .qnum { font-family: var(--font-mono); font-size: .72rem; color: var(--accent); margin-right: .6em; }
.sc-opts { display: flex; gap: 6px; flex-shrink: 0; }
.sc-opt {
  font-family: var(--font-mono); font-size: .78rem;
  border: 1px solid var(--border-strong); background: var(--bg-glass);
  color: var(--muted); border-radius: 999px;
  padding: .5em 1em; cursor: pointer;
  transition: border-color .12s ease, color .12s ease;
}
.sc-opt:hover { border-color: var(--accent); color: var(--text); }
.sc-opt[aria-pressed="true"] { background: var(--grad); border-color: transparent; color: var(--accent-contrast); font-weight: 700; }
.sc-result {
  margin-top: 3rem; border: 1px solid var(--border-strong); border-radius: 18px;
  padding: 2rem;
  background:
    radial-gradient(400px 260px at 8% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%),
    var(--bg-elev);
  box-shadow: var(--shadow);
}
.sc-score-line { display: flex; align-items: baseline; gap: 1.2rem; flex-wrap: wrap; }
.sc-score-num {
  font-family: var(--font-mono); font-size: 3.6rem; font-weight: 700; line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.sc-score-num .of { font-size: 1.1rem; color: var(--faint); font-weight: 400; -webkit-text-fill-color: var(--faint); }
.sc-verdict { font-weight: 650; font-size: 1.05rem; }
.sc-breakdown { list-style: none; margin: 1.6rem 0 0; padding: 0; }
.sc-breakdown li { display: grid; grid-template-columns: minmax(9em, 14em) 1fr 4.5em; align-items: center; gap: .9rem; padding: .45rem 0; font-size: .88rem; }
.sc-breakdown .bd-bar { height: 9px; background: var(--bg-inset); border-radius: 5px; overflow: hidden; }
.sc-breakdown .bd-fill { height: 100%; border-radius: 5px; background: var(--grad); }
.sc-breakdown .bd-val { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); text-align: right; }
.sc-actions { margin-top: 1.6rem; display: flex; gap: .9rem; flex-wrap: wrap; }
.sc-note { font-size: .85rem; color: var(--muted); margin-top: 1rem; }

/* ---------- services ---------- */
.hero-compact { padding-bottom: clamp(2rem, 5vw, 3.5rem); }
.svc {
  border-top: 1px solid var(--border);
  padding: 2.6rem 0 1.6rem;
  scroll-margin-top: 84px;
}
.svc h2 { margin-top: .6rem; border: 0; padding-top: 0; }
.svc ul { padding-left: 1.3em; color: var(--muted); }
.svc li { margin: .4em 0; }
.svc li strong { color: var(--text); }

/* ---------- tech stack strip ---------- */
.stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 1.6rem; }
.stack span {
  font-family: var(--font-mono); font-size: .78rem;
  color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px;
  padding: .35em .95em; background: var(--bg-glass);
  transition: border-color .15s ease, color .15s ease;
}
.stack span:hover { border-color: var(--accent); color: var(--text); }

/* ---------- case study ---------- */
.case { display: grid; grid-template-columns: 1.1fr .9fr; gap: 2rem; align-items: start; }
.case-metrics { display: grid; gap: 12px; }
.case-metric {
  border: 1px solid var(--border); border-radius: 12px;
  padding: 1rem 1.2rem; background: var(--bg-glass);
  display: flex; align-items: baseline; gap: .9rem;
}
.case-metric .n {
  font-family: var(--font-mono); font-size: 1.7rem; font-weight: 700; white-space: nowrap;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.case-metric .l { color: var(--muted); font-size: .9rem; }
@media (max-width: 820px) { .case { grid-template-columns: 1fr; } }

/* ---------- FAQ ---------- */
.faq { max-width: 780px; }
.faq details {
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg-glass); margin-bottom: 10px;
  overflow: hidden;
}
.faq summary {
  cursor: pointer; list-style: none;
  padding: 1rem 1.3rem;
  font-weight: 650; font-size: 1rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-family: var(--font-mono); font-size: 1.2rem;
  color: var(--accent); flex-shrink: 0; transition: transform .2s ease;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details > div { padding: 0 1.3rem 1.1rem; color: var(--muted); font-size: .95rem; }
.faq details[open] { border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 2.4rem 0 3.2rem; margin-top: 3rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1rem 2.2rem; align-items: baseline; font-size: .85rem; color: var(--muted); }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--accent); }
.footer .brand-line { font-family: var(--font-mono); font-size: .78rem; color: var(--faint); margin-right: auto; }

/* ---------- scroll reveal: native scroll-driven animation, no JS.
   Browsers without animation-timeline support simply show content. ---------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(20px); }
}
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      animation: rise .6s ease both;
      animation-timeline: view();
      animation-range: entry 5% entry 35%;
    }
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .card, .article-card { transition: none; }
}

/* ---------- utilities ---------- */
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 2.4rem; }
  .term { max-width: 560px; }
}
@media (max-width: 720px) {
  .model { grid-template-columns: 1fr; }
  .nav-links { gap: .9rem; }
  .nav-links a { font-size: .85rem; }
  .sc-breakdown li { grid-template-columns: 1fr; gap: .25rem; }
  .sc-breakdown .bd-val { text-align: left; }
}
@media (max-width: 460px) {
  body { font-size: 16px; }
  .sc-q { flex-direction: column; align-items: flex-start; gap: .6rem; }
  .brand .tld { display: none; }
  .nav-inner { gap: .8rem; }
  .nav-links { gap: .7rem; }
  .nav-cta { display: none; }
}
@media print {
  .nav, .theme-btn, .sc-progress { display: none; }
}