*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }

.skip-link {
  position: absolute; top: -100%; left: 16px; z-index: 9999;
  background: var(--ink); color: var(--paper);
  font-size: 14px; font-weight: 700; padding: 10px 20px;
  border-radius: 0 0 4px 4px; text-decoration: none; transition: top 160ms;
}
.skip-link:focus { top: 0; }

:root {
  --blue:   #29ABE2;
  --orange: #FF9600;
  --tan:    #C69C6D;
  --ink:    #1F2A36;
  --slate:  #5A6772;
  --paper:  #FAF7F2;
  --white:  #FFFFFF;
  --border: rgba(31,42,54,0.10);
  --serif:  "Source Serif 4", Georgia, serif;
  --sans:   "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --ease:   cubic-bezier(0.22,0.61,0.36,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans); font-size: 16px; line-height: 1.55;
  color: var(--ink); background: var(--paper);
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}

body::after {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat; background-size: 200px 200px; opacity: 0.04;
}

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 40px; }
@media (max-width: 768px) { .wrap { padding: 0 24px; } }

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200; padding: 20px 0;
  background: rgba(250,247,242,0.92);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(31,42,54,0.07);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav-logo img { width: 150px; height: auto; }
.nav-back {
  font-size: 14px; font-weight: 700; color: var(--slate);
  text-decoration: none; display: inline-flex; align-items: center; gap: 6px;
  transition: color 140ms var(--ease);
}
.nav-back:hover { color: var(--blue); }
.nav-back::before { content: '←'; }

main { padding-top: 80px; }
.cs-header { max-width: 760px; padding: 72px 0 56px; }
.page-eyebrow {
  display: block; font-size: 11px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--slate); margin-bottom: 20px;
}
.page-title {
  font-family: var(--serif); font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 600; color: var(--ink); line-height: 1.1; margin-bottom: 24px;
}
.cs-intro { font-size: 18px; color: var(--slate); line-height: 1.7; max-width: 640px; margin-bottom: 40px; }
.page-rule { width: 40px; height: 2px; background: var(--orange); }

/* Case study detail pages */
.cs-sections { max-width: 760px; border-top: 1px solid var(--border); }
.cs-section {
  display: grid; grid-template-columns: 140px 1fr;
  gap: 48px; padding: 52px 0; border-bottom: 1px solid var(--border);
}
@media (max-width: 640px) { .cs-section { grid-template-columns: 1fr; gap: 14px; padding: 40px 0; } }
.cs-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--orange); padding-top: 5px;
}
.cs-body p { font-size: 17px; line-height: 1.8; color: var(--slate); margin-bottom: 18px; }
.cs-body p:last-child { margin-bottom: 0; }
.cs-placeholder { font-style: italic; opacity: 0.45; }

/* Case studies listing page */
.cs-list { max-width: 760px; border-top: 1px solid var(--border); }
.cs-discipline {
  padding: 48px 0; border-bottom: 1px solid var(--border);
  display: grid; grid-template-columns: 180px 1fr; gap: 48px;
}
@media (max-width: 640px) { .cs-discipline { grid-template-columns: 1fr; gap: 16px; padding: 36px 0; } }
.cs-discipline-label {
  font-size: 11px; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--orange); padding-top: 4px;
}
.cs-discipline-cases { display: flex; flex-direction: column; gap: 20px; }
.cs-case-link {
  display: block; text-decoration: none;
  padding: 16px 20px; background: var(--white);
  border: 1px solid var(--border); border-radius: 6px;
  transition: border-color 140ms var(--ease), box-shadow 140ms var(--ease), transform 140ms var(--ease);
}
.cs-case-link:hover {
  border-color: var(--blue);
  box-shadow: 0 4px 16px rgba(0,0,0,0.07);
  transform: translateY(-1px);
}
.cs-case-title { font-size: 15px; font-weight: 600; color: var(--ink); line-height: 1.4; margin-bottom: 4px; }
.cs-case-cta { font-size: 13px; font-weight: 700; color: var(--blue); transition: color 140ms var(--ease); }
.cs-case-link:hover .cs-case-cta { color: var(--orange); }

/* Compact contact form */
.cs-form-section { max-width: 760px; padding: 56px 0 80px; }
.cs-form-heading {
  font-family: var(--serif); font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 600; color: var(--ink); line-height: 1.3; margin-bottom: 28px;
}
.cs-form { display: flex; flex-direction: column; gap: 14px; }
.cs-form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .cs-form-row { grid-template-columns: 1fr; } }
.cs-form .fg { position: relative; }
.cs-form input,
.cs-form textarea {
  display: block; width: 100%; font-family: var(--sans); font-size: 15px;
  color: var(--ink); background: var(--white);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 22px 14px 8px;
  transition: border-color 140ms var(--ease), box-shadow 140ms var(--ease);
  outline: none;
}
.cs-form input:focus,
.cs-form textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(41,171,226,0.12);
}
.cs-form textarea { resize: vertical; min-height: 110px; }
.cs-form button[type="submit"] { align-self: flex-start; }
.cs-form .fg label {
  position: absolute; left: 14px; top: 14px;
  font-size: 15px; font-weight: 400; color: var(--slate);
  pointer-events: none; transform-origin: left center;
  transition: transform 180ms var(--ease), color 180ms var(--ease), font-weight 180ms var(--ease);
}
.cs-form .fg input:focus + label,
.cs-form .fg input:not(:placeholder-shown) + label,
.cs-form .fg textarea:focus + label,
.cs-form .fg textarea:not(:placeholder-shown) + label {
  transform: translateY(-10px) scale(0.78); font-weight: 700;
}
.cs-form .fg input:focus + label,
.cs-form .fg textarea:focus + label { color: var(--blue); }
.btn {
  display: inline-block; font-family: var(--sans); font-size: 15px; font-weight: 700;
  line-height: 1; padding: 14px 28px; border-radius: 4px; text-decoration: none;
  background: var(--orange); color: var(--white); white-space: nowrap;
  cursor: pointer; border: none;
  transition: background 140ms var(--ease), transform 140ms var(--ease), box-shadow 140ms var(--ease);
}
.btn:hover { background: #C46F00; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.14); }

footer { background: var(--ink); padding: 56px 0 36px; }
.ft-logo-plate { display: inline-flex; background: var(--paper); border-radius: 6px; padding: 10px 16px; margin-bottom: 32px; }
.ft-logo-plate img { width: 136px; height: auto; }
.ft-rule { height: 1px; background: rgba(250,247,242,0.10); margin-bottom: 28px; }
.ft-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.ft-copy { font-size: 13px; color: rgba(250,247,242,0.72); }
.ft-legal-link { color: inherit; text-decoration: none; border-bottom: 1px solid rgba(250,247,242,0.20); transition: color 140ms; }
.ft-legal-link:hover { color: var(--paper); }
.ft-tagline { font-family: var(--serif); font-style: italic; font-size: 15px; color: rgba(250,247,242,0.72); }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; border-radius: 2px; }