/* =========================================================================
   TechBrevia — Stylesheet
   Design system: "Precision Brief" — a legal/technical dossier aesthetic
   built for a software engineering firm. Navy ink, brass accent, warm paper
   background, serif display + monospace citation marks + clean sans body.
   ========================================================================= */

/* -------------------------------------------------------------------------
   1. Design tokens
   ------------------------------------------------------------------------- */
:root {
  /* Color: ink navy (primary/trust), steel blue (secondary), brass (accent) */
  --color-ink:        #101828;
  --color-ink-soft:    #1B2436;
  --color-steel:      #1E4B6E;
  --color-steel-soft: #2A5C8A;
  --color-brass:      #B08D57;
  --color-brass-soft: #C9A66B;

  --color-paper:      #FAFAF8;
  --color-paper-alt:  #F1EFE9;
  --color-hairline:   #E1DED5;
  --color-hairline-dark: #2A3140;

  --color-text:       #1B1F27;
  --color-text-muted: #5B6270;
  --color-text-invert: #F8F8F6;
  --color-text-invert-muted: #AEB4C0;

  --color-success:    #3E7C59;
  --color-focus:      #2A5C8A;

  /* Typography */
  --font-display: "Source Serif 4", "Georgia", "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "Courier New", monospace;

  --fs-h1: clamp(2.4rem, 4.4vw, 3.75rem);
  --fs-h2: clamp(1.9rem, 3vw, 2.6rem);
  --fs-h3: clamp(1.3rem, 2vw, 1.65rem);
  --fs-lead: clamp(1.05rem, 1.5vw, 1.25rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-eyebrow: 0.8rem;

  /* Layout */
  --max-width: 1180px;
  --gutter: clamp(1.25rem, 5vw, 3rem);
  --radius: 3px;
  --radius-lg: 6px;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 7.5rem;

  --shadow-card: 0 1px 2px rgba(16, 24, 40, 0.04), 0 6px 20px rgba(16, 24, 40, 0.06);
  --shadow-lift: 0 10px 30px rgba(16, 24, 40, 0.12);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.35s;
}

/* -------------------------------------------------------------------------
   2. Reset & base
   ------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--color-ink);
  margin: 0 0 var(--space-sm);
}
h1 { font-size: var(--fs-h1); letter-spacing: -0.01em; }
h2 { font-size: var(--fs-h2); letter-spacing: -0.01em; }
h3 { font-size: var(--fs-h3); }
h4 { font-size: 1.1rem; font-family: var(--font-body); font-weight: 700; }

p { margin: 0 0 var(--space-sm); color: var(--color-text-muted); }
p:last-child { margin-bottom: 0; }

a { color: var(--color-steel); text-decoration: none; }
a:hover { color: var(--color-brass); }

ul, ol { padding-left: 1.25rem; color: var(--color-text-muted); }
li { margin-bottom: 0.4rem; }

/* Visible keyboard focus everywhere */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-ink);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 1000;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus {
  left: 0;
}

/* -------------------------------------------------------------------------
   3. Layout helpers
   ------------------------------------------------------------------------- */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--space-2xl);
}
.section--tight { padding-block: var(--space-xl); }
.section--alt { background: var(--color-paper-alt); }
.section--ink {
  background: var(--color-ink);
  color: var(--color-text-invert);
}
.section--ink h2, .section--ink h3, .section--ink h1 { color: var(--color-text-invert); }
.section--ink p { color: var(--color-text-invert-muted); }

.section-head {
  max-width: 680px;
  margin-bottom: var(--space-lg);
}
.section-head.center { margin-inline: auto; text-align: center; }

/* Eyebrow / citation-style label — the page's signature typographic device,
   referencing the "brief" (brevia) motif: a short reference mark before
   each section, like a citation in a legal brief. */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-brass);
  margin-bottom: var(--space-sm);
}
.eyebrow::before {
  content: "§";
  color: var(--color-brass);
  font-weight: 700;
}
.section--ink .eyebrow { color: var(--color-brass-soft); }

.lead {
  font-size: var(--fs-lead);
  color: var(--color-text-muted);
}

.grid {
  display: grid;
  gap: var(--space-md);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

.hairline {
  border: none;
  border-top: 1px solid var(--color-hairline);
  margin: var(--space-lg) 0;
}
.section--ink .hairline { border-top-color: var(--color-hairline-dark); }

/* -------------------------------------------------------------------------
   4. Buttons
   ------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--color-brass);
  color: var(--color-ink);
  border-color: var(--color-brass);
}
.btn--primary:hover { background: var(--color-brass-soft); color: var(--color-ink); }

.btn--outline-invert {
  background: transparent;
  color: var(--color-text-invert);
  border-color: rgba(248, 248, 246, 0.35);
}
.btn--outline-invert:hover {
  border-color: var(--color-brass-soft);
  color: var(--color-brass-soft);
}

.btn--outline {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-hairline);
}
.btn--outline:hover {
  border-color: var(--color-steel);
  color: var(--color-steel);
}

.btn--block { width: 100%; }

/* -------------------------------------------------------------------------
   5. Header / Navigation
   ------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--color-hairline);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
}

.nav__brand { display: flex; align-items: center; }
.nav__brand img { height: 30px; width: auto; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding-bottom: 8px;
  padding-top: 8px;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--color-brass);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__links a:hover::after,
.nav__links a[aria-current="page"]::after {
  transform: scaleX(1);
}
.nav__links a[aria-current="page"] { color: var(--color-ink); font-weight: 700; }

.nav__actions { display: flex; align-items: center; gap: var(--space-sm); }

.nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius);
  padding: 0.5rem 0.65rem;
  cursor: pointer;
}
.nav__toggle svg { width: 20px; height: 20px; }

@media (max-width: 880px) {
  .nav__toggle { display: inline-flex; }
  .nav__links {
    position: fixed;
    inset: 68px 0 0 0;
    flex-direction: column;
    align-items: flex-start;
    background: var(--color-paper);
    padding: var(--space-lg) var(--gutter);
    gap: var(--space-md);
    transform: translateX(100%);
    transition: transform var(--dur) var(--ease);
    overflow-y: auto;
  }
  .nav__links.is-open { 
    transform: translateX(0);
    height: calc(200vh - 54px);
  }
  .nav__links a { font-size: 1.15rem; }
  .nav__actions .btn--nav-cta { display: none; }
  .nav__links .btn { margin-top: var(--space-sm); }
}

/* -------------------------------------------------------------------------
   6. Hero
   ------------------------------------------------------------------------- */
.hero {
  padding-block: var(--space-2xl) var(--space-xl);
  background:
    linear-gradient(180deg, var(--color-ink) 0%, var(--color-ink-soft) 100%);
  color: var(--color-text-invert);
  position: relative;
  overflow: hidden;
}
.hero__title {
  color: var(--color-text-invert);
}
.hero::before {
  /* subtle document-tab motif echoing the logo, very low opacity */
  content: "";
  position: absolute;
  right: -60px;
  top: -40px;
  width: 420px;
  height: 420px;
  background:
    linear-gradient(90deg, transparent 0 40%, rgba(176,141,87,0.08) 40% 46%, transparent 46% 58%, rgba(248,248,246,0.05) 58% 64%, transparent 64%);
  pointer-events: none;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-xl);
  align-items: center;
  position: relative;
}
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
}
.hero h1 { max-width: 16ch; }
.hero .lead { color: var(--color-text-invert-muted); max-width: 46ch; }
.hero__cta { display: flex; gap: var(--space-sm); margin-top: var(--space-md); flex-wrap: wrap; }

.hero__panel {
  background: rgba(248, 248, 246, 0.04);
  border: 1px solid rgba(248, 248, 246, 0.14);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
}
.hero__panel-title {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-brass-soft);
  margin-bottom: var(--space-sm);
}
.hero__stat-list { list-style: none; margin: 0; padding: 0; }
.hero__stat-list li {
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-block: 0.7rem;
  border-top: 1px solid rgba(248, 248, 246, 0.1);
  font-size: 0.95rem;
  color: var(--color-text-invert-muted);
}
.hero__stat-list li:first-child { border-top: none; }
.hero__stat-list strong { color: var(--color-text-invert); font-weight: 600; }

/* -------------------------------------------------------------------------
   7. Cards
   ------------------------------------------------------------------------- */
.card {
  background: #fff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
  height: 100%;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-brass-soft);
}
.card__index {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  color: var(--color-brass);
  margin-bottom: var(--space-xs);
}
.card__icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-sm);
}
.card h3 { margin-bottom: 0.5rem; font-size: 1.2rem; }
.card p { margin-bottom: 0; }
.card a.card__link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-weight: 600;
  font-size: 0.9rem;
}

/* Service band (services page detail sections) */
.service-block {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-xl);
  align-items: start;
  padding-block: var(--space-xl);
}
.service-block:not(:last-child) { border-bottom: 1px solid var(--color-hairline); }
@media (max-width: 860px) {
  .service-block { grid-template-columns: 1fr; gap: var(--space-md); }
}
.service-block__list { list-style: none; padding: 0; margin: var(--space-sm) 0 0; }
.service-block__list li {
  padding-left: 1.6rem;
  position: relative;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}
.service-block__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  background: var(--color-brass);
  border-radius: 1px;
}

/* -------------------------------------------------------------------------
   8. Process / Timeline (used only because content is a real sequence)
   ------------------------------------------------------------------------- */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: var(--space-md);
  padding-block: var(--space-md);
  border-top: 1px solid var(--color-hairline);
}
.timeline li:first-child { border-top: none; }
.timeline__num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-brass);
  font-weight: 600;
}
@media (max-width: 620px) {
  .timeline li { grid-template-columns: 50px 1fr; }
}

/* -------------------------------------------------------------------------
   9. FAQ (accordion)
   ------------------------------------------------------------------------- */
.faq-item {
  border-top: 1px solid var(--color-hairline);
}
.faq-item:last-child { border-bottom: 1px solid var(--color-hairline); }
.faq-item__q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1.25rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--color-ink);
}
.faq-item__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
}
.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--color-brass);
  transition: transform var(--dur) var(--ease);
}
.faq-item__icon::before { left: 0; top: 9px; width: 20px; height: 2px; }
.faq-item__icon::after { left: 9px; top: 0; width: 2px; height: 20px; }
.faq-item__q[aria-expanded="true"] .faq-item__icon::after { transform: rotate(90deg); opacity: 0; }

.faq-item__a {
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--dur) var(--ease);
}
.faq-item__a-inner { padding-bottom: 1.25rem; max-width: 65ch; }

/* -------------------------------------------------------------------------
   10. Forms
   ------------------------------------------------------------------------- */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-sm); }
@media (max-width: 620px) { .form-row { grid-template-columns: 1fr; } }

.field { margin-bottom: var(--space-sm); }
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--color-ink);
}
.field .req { color: var(--color-brass); }
.field input,
.field select,
.field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius);
  background: #fff;
  color: var(--color-text);
  transition: border-color var(--dur) var(--ease);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--color-steel);
}
.field textarea { min-height: 140px; resize: vertical; }
.field small { display: block; margin-top: 0.35rem; color: var(--color-text-muted); font-size: 0.82rem; }

.form-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

.form-status {
  margin-top: var(--space-sm);
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  display: none;
}
.form-status.is-visible { display: block; }
.form-status.is-success {
  background: rgba(62, 124, 89, 0.1);
  color: var(--color-success);
  border: 1px solid rgba(62, 124, 89, 0.3);
}
.form-status.is-error {
  background: rgba(176, 60, 60, 0.08);
  color: #A23B3B;
  border: 1px solid rgba(176, 60, 60, 0.3);
}

/* -------------------------------------------------------------------------
   11. Info strips (address / hours / map)
   ------------------------------------------------------------------------- */
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li {
  display: flex;
  gap: var(--space-sm);
  padding-block: 0.85rem;
  border-top: 1px solid var(--color-hairline);
}
.info-list li:first-child { border-top: none; }
.info-list__icon { flex-shrink: 0; width: 22px; height: 22px; color: var(--color-brass); margin-top: 2px; }
.info-list strong { display: block; color: var(--color-ink); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 0.2rem; }

.map-frame {
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-paper-alt);
}
.map-frame iframe { width: 100%; height: 100%; border: 0; }

/* -------------------------------------------------------------------------
   12. Logic strip (industries / tech, small tag chips)
   ------------------------------------------------------------------------- */
.chip-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--color-hairline);
  border-radius: 999px;
  color: var(--color-text-muted);
  background: #fff;
}
.section--ink .chip {
  border-color: rgba(248,248,246,0.18);
  color: var(--color-text-invert-muted);
  background: transparent;
}

/* -------------------------------------------------------------------------
   13. CTA band
   ------------------------------------------------------------------------- */
.cta-band {
  background: var(--color-steel);
  color: var(--color-text-invert);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.cta-band h2, .cta-band p { color: var(--color-text-invert); }
.cta-band p { color: rgba(248,248,246,0.8); }

/* -------------------------------------------------------------------------
   14. Footer
   ------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-text-invert-muted);
  padding-block: var(--space-xl) var(--space-md);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 0.85fr 0.85fr 1fr;
  gap: var(--space-lg);
}
@media (max-width: 860px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer__grid { grid-template-columns: 1fr; }
}
.footer__brand img { height: 28px; margin-bottom: var(--space-sm); }
.footer__col h4 {
  color: var(--color-text-invert);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-sm);
}
.footer__col ul { list-style: none; padding: 0; margin: 0; }
.footer__col li { margin-bottom: 0.55rem; }
.footer__col a { color: var(--color-text-invert-muted); }
.footer__col a:hover { color: var(--color-brass-soft); }

.footer__bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-hairline-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  font-size: 0.85rem;
}
.footer__bottom a { color: var(--color-text-invert-muted); }

/* -------------------------------------------------------------------------
   15. Utility
   ------------------------------------------------------------------------- */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }
.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;
}

.page-hero {
  padding-block: var(--space-xl) var(--space-lg);
  background: var(--color-paper-alt);
  border-bottom: 1px solid var(--color-hairline);
}
.page-hero h1 { max-width: 22ch; }
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-brass); }

.legal h2 { margin-top: var(--space-lg); font-size: 1.4rem; }
.legal h2:first-of-type { margin-top: 0; }
.legal p, .legal li { color: var(--color-text); }
.legal .updated {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* Scroll reveal (subtle, respects reduced motion via section above) */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}