/* Twelve Stack — shared site styles for /for-businesses and /resources
   Matches the visual system of the live homepage at twelvestack.com:
   dark theme, DM Serif Display + Outfit + JetBrains Mono, tan accent. */

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

:root {
  --bg-primary: #0a0c10;
  --bg-secondary: #0f1218;
  --bg-card: #141820;
  --bg-card-hover: #1a1f2a;
  --bg-elevated: #1c212c;
  --text-primary: #e8e6e1;
  --text-secondary: #8a8880;
  --text-muted: #5a5850;
  --accent: #c4956a;
  --accent-light: #d4a87a;
  --accent-dim: rgba(196, 149, 106, 0.12);
  --accent-glow: rgba(196, 149, 106, 0.06);
  --border: rgba(255, 255, 255, 0.06);
  --border-light: rgba(255, 255, 255, 0.1);
  --border-accent: rgba(196, 149, 106, 0.3);
  --serif: 'DM Serif Display', Georgia, serif;
  --sans: 'Outfit', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.35);
}

html { scroll-behavior: smooth; font-size: 17px; }

body {
  font-family: var(--sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Subtle noise texture (matches live homepage) */
body::before {
  content: '';
  position: fixed;
  top: -20%; left: -20%;
  width: 140%; height: 140%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.4;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.01em;
}

h1 em, h2 em, h3 em { font-style: italic; color: var(--accent); }

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-light); }

::selection { background: var(--accent); color: var(--bg-primary); }

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

/* -- Navigation ---------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1.1rem 2rem;
  background: linear-gradient(180deg, rgba(10, 12, 16, 0.92) 0%, rgba(10, 12, 16, 0.82) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.nav-brand {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.nav-brand span { color: var(--accent); }
.nav-brand:hover { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text-primary); }
.nav-links a.active { color: var(--accent); }

/* -- Layout primitives --------------------------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}
.container.narrow { max-width: 760px; }
.center { text-align: center; }

.band { padding: 7rem 0; position: relative; }

.band-ink { background: var(--bg-primary); }
.band-deep { background: var(--bg-secondary); }
.band-card { background: var(--bg-card); }
.band-paper { background: var(--bg-secondary); }
.band-warm { background: var(--bg-card); }
.band-accent {
  background: linear-gradient(135deg, rgba(196, 149, 106, 0.08) 0%, rgba(196, 149, 106, 0.02) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.75rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

.eyebrow::before {
  content: '';
  width: 2rem;
  height: 1px;
  background: var(--accent);
}

.band h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.band h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  max-width: 820px;
}

.band h3 {
  font-size: 1.5rem;
  line-height: 1.3;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.lede {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 620px;
  font-weight: 300;
}

.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.1rem;
  max-width: 640px;
}

.center .lede, .center .prose { margin-left: auto; margin-right: auto; }

.text-link {
  color: var(--accent);
  border-bottom: 1px solid var(--border-accent);
  padding-bottom: 1px;
}
.text-link:hover { border-color: var(--accent); }

/* -- Hero ---------------------------------------- */
.hero {
  padding: 7rem 0 6rem;
  position: relative;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

/* -- Buttons ------------------------------------- */
.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.9rem 1.75rem;
  border-radius: 2px;
  border: 1px solid transparent;
  transition: all 0.3s var(--ease-out-expo);
  cursor: pointer;
  text-align: center;
}

.btn-accent {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}
.btn-accent:hover {
  background: var(--accent-light);
  color: var(--bg-primary);
  box-shadow: 0 0 25px rgba(196, 149, 106, 0.2);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--border-accent);
}
.btn-ghost:hover {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

.btn-dark {
  background: var(--bg-primary);
  color: var(--accent);
  border-color: var(--accent);
}
.btn-dark:hover {
  background: var(--accent);
  color: var(--bg-primary);
}

/* -- Steps ---------------------------------------- */
.steps {
  list-style: none;
  margin: 3rem 0 2.5rem;
  padding: 0;
}

.steps li {
  display: flex;
  gap: 2rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}
.steps li:last-child { border-bottom: 1px solid var(--border); }

.step-num {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  flex-shrink: 0;
  width: 3rem;
  padding-top: 0.25rem;
  letter-spacing: 0.1em;
}

.step-body h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  margin-bottom: 0.4rem;
}

.step-body p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
}

/* -- Case study cards ---------------------------- */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2rem 1.75rem;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  transition: all 0.3s var(--ease-out-expo);
}

.case-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
  color: var(--text-primary);
}

.case-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.case-card h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  line-height: 1.3;
  margin-bottom: 0.9rem;
  color: var(--text-primary);
}

.case-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.case-link {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
}

/* -- Contact grid -------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2.5rem;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.75rem 1.25rem;
  color: var(--text-primary);
  text-align: center;
  transition: all 0.3s var(--ease-out-expo);
}

.contact-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.contact-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.contact-value {
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--text-primary);
}

.crosslink { padding: 4rem 0; background: var(--bg-secondary); border-top: 1px solid var(--border); }
.crosslink .prose { font-size: 1.05rem; color: var(--text-secondary); }

/* -- Case study detail page ---------------------- */
.case-detail h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.case-meta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.75rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.case-meta span:not(:last-child)::after {
  content: '·';
  margin-left: 1rem;
  color: var(--text-muted);
}

.section-block { margin-bottom: 3.5rem; }
.section-block h2 {
  font-size: 1.75rem;
  margin-bottom: 1.1rem;
}

.section-block h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  margin: 1.5rem 0 0.6rem;
  color: var(--text-primary);
}

.section-block ul {
  margin: 1rem 0 1.1rem 1.5rem;
  color: var(--text-secondary);
}
.section-block li { margin-bottom: 0.6rem; line-height: 1.75; }
.section-block strong { color: var(--text-primary); font-weight: 500; }

.callout {
  background: var(--bg-card);
  border-left: 2px solid var(--accent);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  font-family: var(--serif);
  font-weight: 400;
}

/* Demo CTA (HTF case study) */
.demo-cta {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 2px solid var(--accent);
  border-radius: 4px;
  padding: 1.75rem 1.9rem;
  margin: 2rem 0;
  display: flex;
  align-items: center;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.demo-cta-body { flex: 1 1 300px; }

.demo-cta-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.demo-cta h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.demo-cta p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0;
}

/* Images in case studies */
.case-figure { margin: 1.75rem 0; }

.case-figure img {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-card);
}

.case-figure figcaption {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  font-family: var(--serif);
}

.image-placeholder {
  background: var(--bg-secondary);
  border: 1px dashed var(--text-muted);
  border-radius: 4px;
  padding: 3.5rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.85rem;
  margin: 1.5rem 0;
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.back-link:hover { color: var(--accent); }

/* -- Resources page ------------------------------ */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.resource-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  transition: all 0.3s var(--ease-out-expo);
}

.resource-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.resource-card.locked {
  background: var(--bg-secondary);
  border-style: dashed;
}

.resource-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.resource-tag.live { color: var(--accent); }

.resource-card h3 {
  font-family: var(--serif);
  font-size: 1.35rem;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.resource-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* -- Footer -------------------------------------- */
.site-footer {
  background: var(--bg-primary);
  color: var(--text-muted);
  padding: 3rem 0 2.5rem;
  border-top: 1px solid var(--border);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.footer-brand {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}
.footer-links a:hover { color: var(--accent); }

.footer-fineprint {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

/* -- Responsive ---------------------------------- */
@media (max-width: 880px) {
  .case-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr; }
  .band { padding: 5rem 0; }
  .hero { padding: 5rem 0 4rem; }
}

@media (max-width: 560px) {
  html { font-size: 16px; }
  .site-nav { padding: 1rem 1.25rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.7rem; }
  .container { padding: 0 1.25rem; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { text-align: center; }
  .steps li { flex-direction: column; gap: 0.5rem; }
  .step-num { width: auto; }
}