/* B-Tech Consulting — shared styles */
:root {
  --ink: #12202e;
  --ink-soft: #3c4a58;
  --muted: #6a7682;
  --paper: #f7f5f0;
  --card: #ffffff;
  --line: #e2ddd3;
  --accent: #0f7a6c;
  --accent-ink: #0b5c52;
  --accent-wash: #e3f1ee;
  --gold: #b7862e;
  --hero-bg: #12202e;
  --hero-ink: #f3efe6;
  --hero-muted: #a9b4be;
  --shadow: 0 1px 2px rgba(18,32,46,.06), 0 8px 24px rgba(18,32,46,.06);
  --radius: 10px;
  --maxw: 1120px;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #ece8df; --ink-soft: #c5cbd1; --muted: #8e99a4;
    --paper: #0e161f; --card: #15202b; --line: #24323f;
    --accent: #3fbfa9; --accent-ink: #6fd6c3; --accent-wash: #15302d;
    --hero-bg: #091018; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"] {
  --ink: #ece8df; --ink-soft: #c5cbd1; --muted: #8e99a4;
  --paper: #0e161f; --card: #15202b; --line: #24323f;
  --accent: #3fbfa9; --accent-ink: #6fd6c3; --accent-wash: #15302d;
  --hero-bg: #091018; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 17px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--accent-ink); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .wrap { padding: 0 16px; } body { font-size: 16px; } }

.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: #fff; padding: 8px 14px; z-index: 100; }
.skip:focus { left: 8px; top: 8px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark {
  width: 34px; height: 34px; border-radius: 8px; background: var(--accent);
  display: grid; place-items: center; color: #fff; font-family: var(--serif); font-weight: 700; font-size: 18px;
}
.brand-name { font-family: var(--serif); font-weight: 600; font-size: 1.15rem; line-height: 1.1; }
.brand-name small { display: block; font-family: var(--sans); font-size: .72rem; font-weight: 500; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }
.nav { display: flex; gap: 4px; align-items: center; }
.nav a {
  text-decoration: none; color: var(--ink-soft); font-size: .95rem; font-weight: 500;
  padding: 8px 12px; border-radius: 6px;
}
.nav a:hover { background: var(--accent-wash); color: var(--accent-ink); }
.nav a[aria-current="page"] { color: var(--accent-ink); background: var(--accent-wash); }
.nav .nav-cta { background: var(--accent); color: #fff; margin-left: 6px; }
.nav .nav-cta:hover { background: var(--accent-ink); color: #fff; }
.menu-btn { display: none; background: none; border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; color: var(--ink); cursor: pointer; font: inherit; }
@media (max-width: 860px) {
  .menu-btn { display: block; }
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px 16px 16px; }
  .nav.open { display: flex; }
  .nav .nav-cta { margin: 6px 0 0; text-align: center; }
}

/* Hero */
.hero { background: var(--hero-bg); color: var(--hero-ink); position: relative; overflow: hidden; }
.hero .wrap { position: relative; padding-top: 96px; padding-bottom: 96px; }
.hero h1 { color: var(--hero-ink); max-width: 18ch; }
.hero .lede { font-size: 1.2rem; color: var(--hero-muted); max-width: 60ch; }
.eyebrow { font-family: var(--mono); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.hero .eyebrow { color: #5fd3bf; }
.seq {
  position: absolute; inset: 0; font-family: var(--mono); font-size: 13px; line-height: 1.9;
  color: rgba(95, 211, 191, .07); word-break: break-all; pointer-events: none; user-select: none;
  padding: 12px; letter-spacing: .3em;
  mask-image: linear-gradient(90deg, transparent 0%, transparent 35%, #000 75%);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, transparent 35%, #000 75%);
}
.page-hero .wrap { padding-top: 64px; padding-bottom: 56px; }
.page-hero h1 { max-width: 22ch; }

.btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 600; font-size: .98rem;
  padding: 12px 22px; border-radius: 8px; border: 1px solid transparent; cursor: pointer; font-family: var(--sans);
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); color: #fff; }
.btn-ghost { border-color: rgba(243,239,230,.35); color: var(--hero-ink); }
.btn-ghost:hover { border-color: var(--hero-ink); color: var(--hero-ink); }
.btn-outline { border-color: var(--accent); color: var(--accent-ink); background: transparent; }
.btn-outline:hover { background: var(--accent-wash); }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid rgba(243,239,230,.14); margin-top: 56px; }
.stat { padding: 22px 20px 0 0; }
.stat b { display: block; font-family: var(--serif); font-size: 2.3rem; font-weight: 600; color: var(--hero-ink); line-height: 1.1; }
.stat span { font-size: .9rem; color: var(--hero-muted); }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* Sections */
section.block { padding: 88px 0; }
section.block.alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head p { color: var(--ink-soft); font-size: 1.08rem; }
@media (max-width: 600px) { section.block { padding: 60px 0; } }

.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
}
.alt .card { background: var(--paper); box-shadow: none; }
.card h3 { margin-bottom: .4em; }
.card p { color: var(--ink-soft); font-size: .98rem; }
.card .tag { font-family: var(--mono); font-size: .75rem; color: var(--accent-ink); letter-spacing: .08em; text-transform: uppercase; display: block; margin-bottom: 12px; }
.card ul { margin: 0; padding-left: 1.1em; color: var(--ink-soft); font-size: .95rem; }
.card li { margin-bottom: .35em; }
.card-link { text-decoration: none; color: inherit; display: block; transition: transform .15s ease, border-color .15s ease; }
.card-link:hover { transform: translateY(-2px); border-color: var(--accent); color: inherit; }

.quote {
  font-family: var(--serif); font-size: clamp(1.35rem, 2.6vw, 1.9rem); line-height: 1.4; font-weight: 500;
  border-left: 3px solid var(--accent); padding-left: 24px; max-width: 34ch; margin: 0;
}

/* Two-column feature */
.split { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: 32px; } }

.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li { position: relative; padding: 14px 0 14px 34px; border-bottom: 1px solid var(--line); color: var(--ink-soft); }
.checklist li:last-child { border-bottom: 0; }
.checklist li::before {
  content: ""; position: absolute; left: 4px; top: 22px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent-wash); border: 2px solid var(--accent);
}
.checklist strong { color: var(--ink); }

/* Logos / employers strip */
.employers { display: flex; flex-wrap: wrap; gap: 10px 36px; align-items: center; color: var(--muted); font-family: var(--serif); font-size: 1.2rem; }
.employers span { white-space: nowrap; }

/* Timeline */
.timeline { position: relative; margin: 0; padding: 0; list-style: none; }
.timeline::before { content: ""; position: absolute; left: 150px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl-item { display: grid; grid-template-columns: 150px 1fr; gap: 0 40px; padding-bottom: 40px; position: relative; }
.tl-item::before {
  content: ""; position: absolute; left: 144px; top: 8px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--paper); border: 3px solid var(--accent);
}
.tl-date { font-family: var(--mono); font-size: .82rem; color: var(--muted); padding-top: 4px; padding-right: 16px; }
.tl-body h3 { margin-bottom: 2px; }
.tl-org { color: var(--accent-ink); font-weight: 600; margin-bottom: 10px; }
.tl-body ul { margin: 0; padding-left: 1.1em; color: var(--ink-soft); }
.tl-body li { margin-bottom: .3em; }
@media (max-width: 680px) {
  .timeline::before { left: 6px; }
  .tl-item { grid-template-columns: 1fr; padding-left: 32px; }
  .tl-item::before { left: 0; }
  .tl-date { padding: 0 0 4px; }
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: .85rem; padding: 5px 12px; border-radius: 999px; background: var(--accent-wash); color: var(--accent-ink); border: 1px solid transparent; }

/* Publications */
.pub-tools { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 28px; }
.pub-tools input[type="search"] {
  flex: 1 1 260px; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); font: inherit;
}
.filter-btn {
  font: inherit; font-size: .9rem; padding: 9px 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink-soft); cursor: pointer;
}
.filter-btn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.pub-year { font-family: var(--mono); font-size: .85rem; color: var(--muted); margin: 36px 0 10px; letter-spacing: .1em; }
.pub { padding: 18px 0; border-bottom: 1px solid var(--line); }
.pub-title { font-family: var(--serif); font-size: 1.12rem; font-weight: 600; line-height: 1.35; margin-bottom: 4px; }
.pub-title a { color: var(--ink); text-decoration: none; }
.pub-title a:hover { color: var(--accent-ink); text-decoration: underline; }
.pub-authors { color: var(--ink-soft); font-size: .93rem; }
.pub-authors b { color: var(--ink); }
.pub-venue { color: var(--muted); font-size: .9rem; font-style: italic; }
.pub-topic { display: inline-block; font-size: .72rem; font-family: var(--mono); text-transform: uppercase; letter-spacing: .06em;
  color: var(--accent-ink); background: var(--accent-wash); padding: 2px 8px; border-radius: 4px; margin-left: 8px; font-style: normal; vertical-align: 1px; }
.pub-empty { color: var(--muted); padding: 24px 0; display: none; }

.profile-links { display: flex; flex-wrap: wrap; gap: 12px; }

/* Blog */
.post-card { display: grid; grid-template-columns: 140px 1fr; gap: 28px; padding: 32px 0; border-bottom: 1px solid var(--line); }
.post-card time { font-family: var(--mono); font-size: .82rem; color: var(--muted); padding-top: 6px; }
.post-card h2 { font-size: 1.6rem; margin-bottom: .3em; }
.post-card h2 a { color: var(--ink); text-decoration: none; }
.post-card h2 a:hover { color: var(--accent-ink); }
.post-card p { color: var(--ink-soft); }
@media (max-width: 640px) { .post-card { grid-template-columns: 1fr; gap: 6px; } }

.article { max-width: 720px; margin: 0 auto; }
.article h2 { font-size: 1.55rem; margin-top: 1.8em; }
.article p, .article li { color: var(--ink-soft); font-size: 1.06rem; }
.article ul, .article ol { padding-left: 1.2em; margin: 0 0 1.2em; }
.article li { margin-bottom: .5em; }
.article-meta { font-family: var(--mono); font-size: .85rem; color: var(--hero-muted); }
.back-link { display: inline-block; margin-bottom: 18px; color: #5fd3bf; text-decoration: none; font-size: .95rem; }

/* Contact */
.form { display: grid; gap: 18px; }
.field label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink); font: inherit;
}
.field textarea { min-height: 160px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus, .pub-tools input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.form-note { font-size: .88rem; color: var(--muted); }
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.contact-list .label { display: block; font-family: var(--mono); font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.contact-list a { font-weight: 600; font-size: 1.05rem; word-break: break-word; }

/* CTA band */
.cta-band { background: var(--accent); color: #fff; }
.cta-band .wrap { padding-top: 64px; padding-bottom: 64px; display: flex; justify-content: space-between; align-items: center; gap: 28px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; margin: 0; max-width: 24ch; }
.cta-band .btn { background: #fff; color: var(--accent-ink); }
.cta-band .btn:hover { background: var(--hero-ink); }

/* Footer */
.site-footer { background: var(--hero-bg); color: var(--hero-muted); font-size: .92rem; }
.site-footer .wrap { padding-top: 48px; padding-bottom: 40px; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
.site-footer a { color: var(--hero-ink); text-decoration: none; }
.site-footer a:hover { color: #5fd3bf; }
.site-footer h4 { color: var(--hero-ink); font-family: var(--mono); font-size: .75rem; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 12px; font-weight: 500; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 6px; }
.footer-base { border-top: 1px solid rgba(243,239,230,.1); }
.footer-base .wrap { display: flex; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; grid-template-columns: none; font-size: .82rem; flex-wrap: wrap; gap: 8px; }
@media (max-width: 760px) { .site-footer .wrap { grid-template-columns: 1fr; } }