/* ============================================================
   Sterling Consulting Services — shared design system
   Source of truth for tokens and base components.
   Loaded via:  <link rel="stylesheet" href="/assets/css/site.css">
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Color */
  --color-bg:             #ffffff;
  --color-surface:        #f7f7f8;
  --color-surface-raised: #ffffff;
  --color-border:         #e5e5e5;
  --color-text-primary:   #1a1a1a;
  --color-text-secondary: #555555;
  --color-text-muted:     #999999;
  --color-accent:         #dc2626;
  --color-accent-dim:     #b91c1c;
  --color-accent-glow:    rgba(220,38,38,0.08);
  --color-accent-soft:    rgba(220,38,38,0.10);
  /* Backwards-compatible aliases (the existing index.html refers to these names) */
  --color-teal:           var(--color-accent);
  --color-teal-dim:       var(--color-accent-dim);
  --color-teal-glow:      var(--color-accent-soft);

  /* Type */
  --font-display: 'Cormorant Garant', 'Cormorant Garamond', Georgia, serif;
  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, -apple-system, sans-serif;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.375rem;
  --text-2xl:  1.75rem;
  --text-3xl:  2.25rem;
  --text-4xl:  3rem;
  --text-5xl:  4rem;
  --text-6xl:  5.5rem;
  --text-hero: clamp(4rem, 10vw, 8.5rem);

  /* Space */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --section-padding: clamp(5rem, 10vh, 8rem);

  /* Motion */
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-spring:    cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --duration-fast:   150ms;
  --duration-base:   250ms;
  --duration-slow:   400ms;
  --duration-reveal: 700ms;

  /* Layout */
  --max-width:     1200px;
  --content-width: 720px;
  --nav-height:    72px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-pill: 999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 10px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 12px 28px rgba(0,0,0,0.08);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body.drawer-open { overflow: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ---------- Accessibility ---------- */
.skip-link {
  position: absolute; top: -100px; left: var(--space-4); z-index: 999;
  padding: var(--space-3) var(--space-6);
  background: var(--color-accent); color: var(--color-bg);
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 500;
  text-decoration: none; border-radius: var(--radius-sm);
  transition: top var(--duration-fast);
}
.skip-link:focus { top: var(--space-4); }
*:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: var(--radius-sm); }

/* ---------- Typography helpers ---------- */
.label, .eyebrow {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.h-display { font-family: var(--font-display); font-weight: 400; line-height: 1.05; letter-spacing: -0.01em; }
.h-heading { font-family: var(--font-heading); font-weight: 400; line-height: 1.15; letter-spacing: -0.01em; }
.text-muted { color: var(--color-text-secondary); }
.text-faint { color: var(--color-text-muted); }

/* ---------- Container ---------- */
.container        { max-width: var(--max-width);     margin-inline: auto; padding-inline: var(--space-8); }
.container--base  { max-width: 1000px;               margin-inline: auto; padding-inline: var(--space-8); }
.container--narrow{ max-width: var(--content-width); margin-inline: auto; padding-inline: var(--space-8); }
.lazy-section { content-visibility: auto; contain-intrinsic-size: auto 600px; }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-reveal) var(--ease-out-quart),
              transform var(--duration-reveal) var(--ease-out-quart);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal--clip {
  opacity: 0;
  clip-path: inset(100% 0 0 0);
  transition: opacity var(--duration-reveal) var(--ease-out-quart),
              clip-path var(--duration-reveal) var(--ease-out-quart);
}
.reveal--clip.is-visible { opacity: 1; clip-path: inset(0% 0 0 0); }
.reveal--stagger > * { opacity: 0; transform: translateY(20px); transition: opacity var(--duration-reveal) var(--ease-out-quart), transform var(--duration-reveal) var(--ease-out-quart); }
.reveal--stagger.is-visible > * { opacity: 1; transform: translateY(0); }
.reveal--stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal--stagger.is-visible > *:nth-child(2) { transition-delay: 80ms; }
.reveal--stagger.is-visible > *:nth-child(3) { transition-delay: 160ms; }
.reveal--stagger.is-visible > *:nth-child(4) { transition-delay: 240ms; }
.reveal--stagger.is-visible > *:nth-child(5) { transition-delay: 320ms; }
.reveal--stagger.is-visible > *:nth-child(6) { transition-delay: 400ms; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 500;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition:
    background var(--duration-base) var(--ease-out-quart),
    border-color var(--duration-base) var(--ease-out-quart),
    color var(--duration-base) var(--ease-out-quart),
    transform var(--duration-fast) var(--ease-out-quart);
}
.btn:hover  { transform: scale(1.02); }
.btn:active { transform: scale(0.98); }
.btn--primary  { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-bg); }
.btn--primary:hover { background: var(--color-accent-dim); border-color: var(--color-accent-dim); }
.btn--ghost    { background: transparent; border-color: var(--color-accent); color: var(--color-accent); }
.btn--ghost:hover { background: var(--color-accent-soft); }
.btn--quiet    { background: transparent; border-color: var(--color-border); color: var(--color-text-primary); }
.btn--quiet:hover { border-color: var(--color-text-primary); }

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition:
    border-color var(--duration-base) var(--ease-out-quart),
    transform    var(--duration-base) var(--ease-out-quart),
    box-shadow   var(--duration-base) var(--ease-out-quart);
}
.card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}
.card--flat:hover { transform: none; box-shadow: var(--shadow-md); }
.card--surface { background: var(--color-surface); }

/* ---------- Navigation (shared) ---------- */
#main-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height); background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--duration-slow) var(--ease-out-quart),
              border-color var(--duration-slow) var(--ease-out-quart);
}
#main-nav.scrolled {
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
}
.nav-inner {
  display: flex; align-items: center; height: 100%;
  max-width: var(--max-width); margin-inline: auto; padding-inline: var(--space-8);
}
.nav-logo {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-body); font-size: var(--text-xs); font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--color-text-primary); text-decoration: none;
  flex-shrink: 0; transition: color var(--duration-base);
}
.nav-logo:hover { color: var(--color-accent); }
.nav-logo-icon { height: 36px; width: auto; }
.nav-links {
  margin-left: auto; display: flex; gap: var(--space-8); list-style: none; align-items: center;
}
.nav-links a {
  font-family: var(--font-body); font-size: var(--text-sm); font-weight: 400;
  letter-spacing: 0.04em; color: var(--color-text-secondary); text-decoration: none;
  position: relative; transition: color var(--duration-base) var(--ease-out-quart);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -3px; left: 0;
  width: 0; height: 1px; background: var(--color-accent);
  transition: width var(--duration-base) var(--ease-out-quart);
}
.nav-links a:hover, .nav-links a.active { color: var(--color-text-primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-cta { margin-left: var(--space-2); }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px; margin-left: auto;
  background: none; border: 0; cursor: pointer; padding: var(--space-2);
}
.nav-toggle span {
  display: block; width: 22px; height: 1px; background: var(--color-text-primary);
  transition: transform var(--duration-base), opacity var(--duration-base);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
@media (max-width: 768px) {
  .nav-links {
    display: none; position: fixed; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; align-items: flex-start;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    padding: var(--space-8); gap: var(--space-6);
    border-bottom: 1px solid var(--color-border);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .nav-cta { margin-left: 0; }
}

/* ---------- Footer (shared) ---------- */
#main-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-24);
  font-size: var(--text-sm);
}
.footer-inner {
  max-width: var(--max-width); margin-inline: auto; padding-inline: var(--space-8);
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: var(--space-12);
}
.footer-col h4 {
  font-family: var(--font-body); font-size: var(--text-xs); font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-text-muted); margin-bottom: var(--space-4);
}
.footer-col a {
  display: block; text-decoration: none; color: var(--color-text-secondary);
  padding: var(--space-1) 0;
  transition: color var(--duration-base) var(--ease-out-quart);
}
.footer-col a:hover { color: var(--color-accent); }
.footer-brand-tag {
  font-family: var(--font-display); font-style: italic;
  font-size: var(--text-lg); color: var(--color-text-secondary);
  line-height: 1.5; max-width: 28ch;
}
.footer-bottom {
  max-width: var(--max-width); margin-inline: auto; padding: var(--space-8) var(--space-8) 0;
  border-top: 1px solid var(--color-border); margin-top: var(--space-12);
  display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: space-between;
  color: var(--color-text-muted); font-size: var(--text-xs);
}
@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
  .footer-brand-tag { grid-column: 1 / -1; }
}

/* ---------- FAQ <details> ---------- */
.faq-list details {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-5) 0;
}
.faq-list details > summary {
  list-style: none; cursor: pointer; position: relative;
  padding-right: var(--space-10);
  font-family: var(--font-body); font-size: var(--text-lg); font-weight: 500;
  color: var(--color-text-primary);
}
.faq-list details > summary::-webkit-details-marker { display: none; }
.faq-list details > summary::after {
  content: ''; position: absolute; right: 0; top: 50%;
  width: 12px; height: 12px;
  border-right: 1.5px solid var(--color-accent);
  border-bottom: 1.5px solid var(--color-accent);
  transform: translateY(-70%) rotate(45deg);
  transition: transform var(--duration-base) var(--ease-out-quart);
}
.faq-list details[open] > summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq-list details > div, .faq-list details > p {
  margin-top: var(--space-4); color: var(--color-text-secondary); line-height: 1.7;
}

/* ---------- Forms ---------- */
.form-row {
  display: flex; gap: var(--space-3);
}
.form-row input[type="email"], .form-row input[type="text"] {
  flex: 1; padding: var(--space-3) var(--space-4);
  font: inherit; color: var(--color-text-primary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--duration-base);
}
.form-row input:focus { outline: none; border-color: var(--color-accent); }
.form-row [disabled] { opacity: 0.55; cursor: not-allowed; }
.form-note { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-2); }

/* ---------- Tag / chip ---------- */
.chip {
  display: inline-block;
  font-family: var(--font-body); font-size: var(--text-xs); font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
}

/* ---------- Related reading / pairs-well-with ---------- */
.related-section {
  margin: var(--space-12) 0 var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}
.related-section .related-title {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}
.related-section .related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}
.related-section .related-list li { margin: 0; }
.related-section .related-list a {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 300;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast) var(--ease-out-quart);
}
.related-section .related-list a:hover {
  border-bottom-color: var(--color-accent);
}

/* ---------- Testimonials strip ---------- */
.testimonials-strip {
  max-width: var(--container-base, 1100px);
  margin: clamp(4rem, 8vw, 6rem) auto;
  padding: 0 1.5rem;
}
.testimonials-strip .ts-eyebrow {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-8);
}
.testimonials-strip .ts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 360px), 1fr));
  gap: var(--space-8);
}
.testimonials-strip .ts-quote {
  display: flex;
  flex-direction: column;
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: border-color var(--duration-base) var(--ease-out-quart),
              transform var(--duration-base) var(--ease-out-quart),
              box-shadow var(--duration-base) var(--ease-out-quart);
}
.testimonials-strip .ts-quote:hover {
  border-color: var(--color-border-strong, var(--color-border));
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover, 0 12px 32px rgba(0,0,0,0.06));
}
.testimonials-strip blockquote {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 300;
  font-style: italic;
  line-height: 1.65;
  color: var(--color-text);
  margin: 0 0 var(--space-6);
}
.testimonials-strip .ts-attribution {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.testimonials-strip .ts-name {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.testimonials-strip .ts-meta {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.testimonials-strip .ts-link {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  text-decoration: none;
  margin-top: var(--space-3);
  align-self: flex-start;
}
.testimonials-strip .ts-link:hover { text-decoration: underline; }

/* ---------- Email capture ---------- */
.email-capture {
  margin-top: var(--space-6);
}
.email-capture .ec-label {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.email-capture .ec-row {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.email-capture input[type="email"] {
  flex: 1 1 200px;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--duration-fast) var(--ease-out-quart);
}
.email-capture input[type="email"]:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}
.email-capture input[type="email"]:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.email-capture button[type="submit"] {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: #ffffff;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-out-quart);
}
.email-capture button[type="submit"]:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background: var(--color-text-muted);
  border-color: var(--color-text-muted);
}
.email-capture .ec-note {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-3);
  line-height: 1.5;
}

/* ---------- Footer legal row ---------- */
#main-footer .footer-legal {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}
#main-footer .footer-legal a {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
}
#main-footer .footer-legal a:hover { color: var(--color-text); }

/* ---------- Page-enter (soften initial paint) ---------- */
body { animation: pageEnter var(--duration-slow) var(--ease-out-quart) both; }
@keyframes pageEnter {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal, .reveal--clip, .reveal--stagger > * {
    opacity: 1; transform: none; clip-path: none;
  }
  body { animation: none; }
}