/* ============================================================
   Raman Research & Innovation Pvt. Ltd. — site stylesheet
   Clean, modern, minimal, technology-focused.
   Light theme: white-dominant with blue shades.
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-alt: #f2f7fd;
  --card: #ffffff;
  --border: #dbe6f3;
  --text: #102a4d;
  --muted: #55677f;
  --accent: #2563eb;
  --accent-deep: #1e40af;
  --accent-sky: #0ea5e9;
  --gradient: linear-gradient(135deg, #0ea5e9 0%, #2563eb 55%, #1e40af 100%);
  --radius: 14px;
  --font-head: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --maxw: 1140px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  /* Engineering graph-paper: fine grid + bolder major lines */
  background:
    linear-gradient(rgba(37, 99, 235, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.055) 1px, transparent 1px),
    linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px),
    var(--bg);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }

.container {
  width: min(var(--maxw), 92%);
  margin-inline: auto;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.15; font-weight: 600; }

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }

.lead { color: var(--muted); font-size: 1.06rem; max-width: 62ch; }

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--gradient);
  border-radius: 2px;
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.brand { display: flex; align-items: center; }

.brand .logo-img { height: 42px; width: auto; }

.site-footer .brand .logo-img { height: 48px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--muted);
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover { color: var(--accent); background: rgba(37, 99, 235, 0.06); }

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

.nav-links a.active:not(.btn) {
  background: rgba(37, 99, 235, 0.09);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  color: var(--text);
  cursor: pointer;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
}

.btn-primary {
  background: var(--gradient);
  color: #ffffff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(37, 99, 235, 0.35);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--accent);
  background: #ffffff;
}

.btn-ghost:hover { border-color: var(--accent); background: rgba(37, 99, 235, 0.05); }

.nav-links .btn-primary { padding: 0.55rem 1.15rem; color: #ffffff; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: clamp(4.5rem, 10vw, 8rem) 0 clamp(3.5rem, 8vw, 6rem);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 20%, rgba(14, 165, 233, 0.1), transparent 70%),
    radial-gradient(ellipse 50% 40% at 20% 80%, rgba(37, 99, 235, 0.08), transparent 70%);
  pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 999px;
  padding: 0.35rem 0.95rem;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(16, 42, 77, 0.05);
}

.hero-tag .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(37, 99, 235, 0.6);
}

.hero .lead { margin-top: 1.4rem; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2.2rem;
}

/* Page hero (inner pages) */

.page-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 8vw, 5.5rem) 0 clamp(2.5rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--border);
  /* translucent so the graph-paper grid shows through */
  background:
    radial-gradient(ellipse 55% 80% at 80% 0%, rgba(14, 165, 233, 0.08), transparent 70%),
    rgba(240, 246, 253, 0.72);
}

.page-hero .container { position: relative; z-index: 1; }

.page-hero .lead { margin-top: 1rem; }

/* ---------- Sections ---------- */

.section { padding: clamp(3.5rem, 8vw, 5.5rem) 0; }

.section-alt {
  position: relative;
  overflow: hidden;
  background: rgba(240, 246, 253, 0.72);
  border-block: 1px solid var(--border);
}

/* circuit-trace sketch in the corner of alt sections */
.section-alt::after {
  content: "";
  position: absolute;
  right: -24px;
  bottom: -24px;
  width: 250px;
  height: 250px;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 220 220" fill="none" stroke="%232563eb" stroke-width="1.5"><path d="M10 210 V150 H70 V90 H130 V30 H190"/><path d="M40 210 V170 H100 V110 H160 V50 H210" stroke-dasharray="5 7" opacity=".6"/><circle cx="10" cy="210" r="4"/><circle cx="70" cy="90" r="4"/><circle cx="130" cy="30" r="4"/><circle cx="190" cy="30" r="4" fill="%232563eb"/><circle cx="100" cy="110" r="3"/><circle cx="210" cy="50" r="3"/></svg>') no-repeat center / contain;
  opacity: 0.16;
  pointer-events: none;
}

.section-alt .container { position: relative; z-index: 1; }

.section-head { max-width: 640px; margin-bottom: 2.75rem; }

.section-head.center { margin-inline: auto; text-align: center; }

.section-head.center .eyebrow { justify-content: center; }

.section-head .lead { margin-top: 0.9rem; }

/* ---------- Cards & grids ---------- */

.grid {
  display: grid;
  gap: 1.4rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.7rem;
  box-shadow: 0 2px 12px rgba(16, 42, 77, 0.05);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 16px 34px rgba(16, 42, 77, 0.12);
}

.card .icon {
  width: 46px;
  height: 46px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.card .icon svg { width: 22px; height: 22px; }

.card h3 { margin-bottom: 0.5rem; }

.card p { color: var(--muted); font-size: 0.94rem; }

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- Stats strip ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.4rem;
  text-align: center;
}

.stat h3 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat p { color: var(--muted); font-size: 0.9rem; margin-top: 0.25rem; }

/* ---------- Steps (how we work) ---------- */

.steps { counter-reset: step; }

.step { position: relative; padding-top: 0.4rem; }

.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--font-head);
  font-size: 2.6rem;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px rgba(37, 99, 235, 0.45);
  display: block;
  margin-bottom: 0.6rem;
}

/* ---------- Project cards ---------- */

.project-card {
  overflow: hidden;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.project-media {
  height: 170px;
  display: grid;
  place-items: center;
  background:
    radial-gradient(ellipse 80% 90% at 50% 110%, rgba(14, 165, 233, 0.16), transparent 70%),
    linear-gradient(180deg, rgba(37, 99, 235, 0.06), transparent),
    var(--bg-alt);
  border-bottom: 1px solid var(--border);
  color: var(--accent);
}

.project-media svg { width: 52px; height: 52px; opacity: 0.9; }

.project-body { padding: 1.5rem 1.7rem 1.7rem; display: flex; flex-direction: column; flex: 1; }

.tags { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-bottom: 0.85rem; }

.tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.22);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

/* ---------- Product cards: status badge + spec chips ---------- */

.project-card { position: relative; }

.badge {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 1;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-deep);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  box-shadow: 0 2px 8px rgba(16, 42, 77, 0.08);
}

.specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border);
}

.spec {
  font-size: 0.73rem;
  font-weight: 500;
  color: var(--muted);
  background: #f6faff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.18rem 0.55rem;
}

/* ---------- Portfolio: numbered case-study rows ---------- */

.portfolio-list {
  display: grid;
  gap: 1.4rem;
}

.case-study {
  display: grid;
  grid-template-columns: 84px 230px 1fr;
  gap: 1.2rem 2.2rem;
  align-items: start;
  padding: 2rem 2.2rem;
}

.cs-num {
  font-family: var(--font-head);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  padding-top: 0.2rem;
  color: transparent;
  -webkit-text-stroke: 1px rgba(37, 99, 235, 0.5);
}

.cs-facts {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.9;
}

.cs-facts strong { color: var(--text); font-weight: 600; }

.cs-body h3 { font-size: 1.25rem; margin-bottom: 0.7rem; }

.cs-body p { color: var(--muted); font-size: 0.95rem; margin-bottom: 0.45rem; }

.cs-body p strong { color: var(--text); }

.cs-body .work-outcome { padding-top: 0.5rem; }

@media (max-width: 960px) {
  .case-study { grid-template-columns: 1fr; gap: 0.8rem; padding: 1.6rem; }
  .cs-num { font-size: 1.9rem; }
  .cs-facts { margin-top: 0.5rem; }
}

.project-media.has-photo { padding: 0; }

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cs-photo {
  width: 100%;
  margin-top: 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
}

/* ---------- Team cards ---------- */

.team-card { text-align: center; padding: 2rem 1.7rem; }

.team-card img {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.1rem;
  border: 3px solid rgba(37, 99, 235, 0.25);
}

.team-card h3 { margin-bottom: 0.2rem; }

.team-card p { color: var(--accent); font-size: 0.88rem; font-weight: 600; }

/* ---------- Portfolio filters ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.2rem;
}

.filter-btn {
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 1.1rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.filter-btn:hover { color: var(--accent); border-color: var(--accent); }

.filter-btn.active {
  color: #ffffff;
  background: var(--gradient);
  border-color: transparent;
}

.filtered-out { display: none !important; }

.work-outcome {
  margin-top: auto;
  padding-top: 0.9rem;
  font-size: 0.85rem !important;
  font-weight: 600;
  color: var(--accent) !important;
}

/* ---------- Vision / Mission ---------- */

.vm-card {
  position: relative;
  padding: 2.2rem;
}

.vm-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 2.2rem;
  width: 56px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--gradient);
}

.vm-card h3 { font-size: 1.35rem; margin-bottom: 0.75rem; }

.vm-card p { color: var(--muted); }

/* ---------- Checklist ---------- */

.checklist { list-style: none; display: grid; gap: 0.7rem; margin-top: 1.2rem; }

.checklist li {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
  color: var(--muted);
  font-size: 0.96rem;
}

.checklist li::before {
  content: "";
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
  border-radius: 50%;
  background:
    url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%232563eb" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><polyline points="20 6 9 17 4 12"/></svg>') center/11px no-repeat,
    rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.3);
}

/* ---------- CTA banner ---------- */
/* Deep-blue panel — the "blue" in a white-dominant page. */

.cta-banner {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--accent-deep);
  border-radius: 20px;
  padding: clamp(2.5rem, 6vw, 4rem);
  text-align: center;
  color: #ffffff;
  background:
    radial-gradient(ellipse 70% 100% at 50% 0%, rgba(56, 189, 248, 0.25), transparent 70%),
    linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
}

/* white constellation sketch over the blue panel */
.cta-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 420 300" fill="none" stroke="white" stroke-width="1"><path d="M40 240 L130 170 L240 200 L330 100 L395 150 M130 170 L185 70 L240 200 M185 70 L330 100 M40 240 L185 70"/><circle cx="40" cy="240" r="3" fill="white" stroke="none"/><circle cx="130" cy="170" r="3" fill="white" stroke="none"/><circle cx="240" cy="200" r="3" fill="white" stroke="none"/><circle cx="330" cy="100" r="3" fill="white" stroke="none"/><circle cx="395" cy="150" r="3" fill="white" stroke="none"/><circle cx="185" cy="70" r="3" fill="white" stroke="none"/></svg>') right -40px top -20px / 430px no-repeat;
  opacity: 0.28;
  pointer-events: none;
}

.cta-banner > * { position: relative; z-index: 1; }

.cta-banner h2 { margin-bottom: 0.8rem; color: #ffffff; }

.cta-banner .gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, #bae6fd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.cta-banner p { color: rgba(255, 255, 255, 0.82); max-width: 54ch; margin: 0 auto 1.8rem; }

.cta-banner .btn-primary {
  background: #ffffff;
  color: var(--accent-deep);
}

.cta-banner .btn-primary:hover {
  box-shadow: 0 10px 26px rgba(2, 12, 40, 0.35);
}

/* ---------- Contact ---------- */

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.4fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-info .card { margin-bottom: 1.2rem; }

.contact-info a { color: var(--accent); word-break: break-all; }

form.enquiry {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: grid;
  gap: 1.15rem;
  box-shadow: 0 2px 12px rgba(16, 42, 77, 0.05);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.15rem; }

.field { display: grid; gap: 0.4rem; }

.field label { font-size: 0.86rem; font-weight: 600; }

.field label .opt { color: var(--muted); font-weight: 400; font-size: 0.8rem; }

.field input,
.field textarea {
  font: inherit;
  color: var(--text);
  background: #f8fbfe;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 0.7rem 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}

.field input::placeholder,
.field textarea::placeholder { color: #9aa9bd; }

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

.field textarea { resize: vertical; min-height: 130px; }

.form-note { font-size: 0.83rem; color: var(--muted); }

.form-status {
  display: none;
  border-radius: 9px;
  padding: 0.8rem 1rem;
  font-size: 0.9rem;
  border: 1px solid rgba(37, 99, 235, 0.3);
  background: rgba(37, 99, 235, 0.07);
  color: var(--text);
}

.form-status.show { display: block; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 3.5rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-grid h4 {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.footer-grid ul { list-style: none; display: grid; gap: 0.55rem; }

.footer-grid ul a { color: var(--muted); font-size: 0.93rem; transition: color 0.2s; }

.footer-grid ul a:hover { color: var(--accent); }

.footer-brand p { color: var(--muted); font-size: 0.93rem; max-width: 40ch; margin-top: 0.9rem; }

.footer-tagline {
  font-family: var(--font-head);
  font-weight: 600;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.84rem;
}

/* ---------- Reveal animation ---------- */
/* Hidden state only applies once JS tags <html class="js">,
   so content stays visible if scripts don't run. */

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Tech marquee ---------- */

.marquee-section {
  padding: 2.4rem 0;
  border-block: 1px solid var(--border);
  background: rgba(240, 246, 253, 0.5);
  overflow: hidden;
}

.marquee {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}

.marquee-track {
  display: flex;
  gap: 0.9rem;
  width: max-content;
  animation: marquee-scroll 38s linear infinite;
}

.marquee:hover .marquee-track { animation-play-state: paused; }

.tech-chip {
  flex: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 1.1rem;
}

@keyframes marquee-scroll {
  to { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; flex-wrap: wrap; width: auto; justify-content: center; }
}

/* ---------- Collaborations (scrolling marquee) ---------- */

.collab-marquee .marquee-track {
  gap: 1.2rem;
  align-items: stretch;
  /* a touch slower than the tech chips so logos stay readable */
  animation-duration: 42s;
}

.collab-card {
  flex: none;
  width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  text-align: center;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1.2rem;
  box-shadow: 0 2px 12px rgba(16, 42, 77, 0.05);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.collab-card:hover {
  transform: translateY(-4px);
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 14px 30px rgba(16, 42, 77, 0.1);
}

.collab-card img {
  height: 54px;
  max-width: 100%;
  width: auto;
  object-fit: contain;
  /* neutralise mismatched logo colours to a tasteful greyscale, colour on hover */
  filter: grayscale(1);
  opacity: 0.75;
  transition: filter 0.25s, opacity 0.25s;
}

.collab-card:hover img { filter: none; opacity: 1; }

.collab-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

/* ---------- Testimonials ---------- */

.testimonial-card { position: relative; padding-top: 2.6rem; }

.testimonial-card::before {
  content: "\201C";
  position: absolute;
  top: 0.5rem;
  left: 1.5rem;
  font-family: var(--font-head);
  font-size: 3.4rem;
  line-height: 1;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.testimonial-role {
  margin-top: 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

/* ---------- FAQ accordion ---------- */

.faq {
  display: grid;
  gap: 0.9rem;
  max-width: 820px;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.4rem;
  box-shadow: 0 2px 12px rgba(16, 42, 77, 0.05);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-family: var(--font-head);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: "+";
  flex: none;
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--accent);
  transition: transform 0.25s;
}

.faq details[open] summary::after { transform: rotate(45deg); }

.faq details p { margin-top: 0.8rem; color: var(--muted); font-size: 0.94rem; }

/* ---------- Back to top ---------- */

.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--gradient);
  color: #ffffff;
  font-size: 1.15rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
}

.to-top.show { opacity: 1; visibility: visible; transform: none; }

/* ---------- Header shadow on scroll ---------- */

.site-header.scrolled { box-shadow: 0 6px 24px rgba(16, 42, 77, 0.08); }

/* ---------- Skip link (accessibility) ---------- */

.skip-link {
  position: absolute;
  left: 1rem;
  top: -48px;
  z-index: 200;
  background: var(--accent);
  color: #ffffff;
  padding: 0.5rem 1rem;
  border-radius: 0 0 8px 8px;
  font-weight: 600;
  transition: top 0.2s;
}

.skip-link:focus { top: 0; }

/* ---------- Footer social links ---------- */

.social-row { display: flex; gap: 0.7rem; margin-top: 1.1rem; }

.social-row a {
  width: 37px;
  height: 37px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: #ffffff;
  display: grid;
  place-items: center;
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}

.social-row a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }

.social-row svg { width: 17px; height: 17px; }

/* ---------- 404 ---------- */

.error-hero { text-align: center; padding: clamp(5rem, 14vw, 9rem) 0; }

.error-hero .big {
  font-family: var(--font-head);
  font-size: clamp(5rem, 16vw, 9rem);
  font-weight: 700;
  line-height: 1;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Decorative sketches & network layer ---------- */

.net-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.float-shape {
  position: absolute;
  pointer-events: none;
  opacity: 0.5;
  animation: float-drift 9s ease-in-out infinite alternate;
}

.fs-cube { width: 48px; left: 4%; bottom: 12%; animation-duration: 13s; }

/* --px / --py are set by JS for mouse parallax; default to 0 */
@keyframes float-drift {
  from { transform: translate(var(--px, 0px), calc(var(--py, 0px) - 8px)) rotate(-2deg); }
  to   { transform: translate(var(--px, 0px), calc(var(--py, 0px) + 10px)) rotate(3deg); }
}

@media (prefers-reduced-motion: reduce) {
  .float-shape { animation: none; }
}

@media (max-width: 680px) {
  .float-shape { display: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .contact-layout { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* nav collapses earlier — 7 links need the room */
@media (max-width: 940px) {
  .nav-toggle { display: block; }

  .brand .logo-img { height: 34px; }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 12px 24px rgba(16, 42, 77, 0.08);
    padding: 0.8rem 4%;
    display: none;
  }

  .nav-links.open { display: flex; }

  .nav-links a { padding: 0.75rem 0.85rem; }

  .nav-links .btn-primary { justify-content: center; margin-top: 0.4rem; }
}