/* ── Reset & Base ──────────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --charcoal: #0a0f0f;
  --off-white: #fdfcfb;
  --warm-grey: #f3f2f1;
  --mid-grey: #9a9a96;
  --border: #dfddd7;
  --accent: #c4873b;
  --accent-light: #d4a65a;
  --deep: #1a1f1f;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --serif: 'Libre Baskerville', 'Georgia', serif;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--sans);
  background: var(--off-white);
  color: var(--charcoal);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.container--narrow { max-width: 900px; margin: 0 auto; padding: 0 2rem; }

/* ── Reveal animation ──────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Header / Nav ──────────────────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 1.5rem 2rem;
  transition: transform 0.4s ease, background 0.3s ease;
}
.nav--hidden { transform: translateY(-100%); }
.nav--solid {
  background: rgba(10, 15, 15, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.nav--always-solid {
  background: rgba(10, 15, 15, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.nav__inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
}
.nav__logo {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  color: var(--off-white);
  text-transform: uppercase;
}
.nav__logo span { color: var(--accent); }
.nav__links { display: flex; gap: 2rem; list-style: none; }
.nav__links a {
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  color: rgba(253, 252, 251, 0.7);
  transition: color 0.3s;
  text-transform: uppercase;
}
.nav__links a:hover, .nav__links a.active { color: var(--off-white); }

.nav__burger {
  display: none; cursor: pointer; flex-direction: column;
  gap: 5px; background: none; border: none; padding: 4px;
}
.nav__burger span {
  width: 24px; height: 1.5px; background: var(--off-white);
  transition: all 0.3s;
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed; top: 0; right: 0; bottom: 0;
    flex-direction: column; justify-content: center; align-items: center;
    background: var(--charcoal); width: 100%; gap: 2rem;
    transform: translateX(100%); transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .nav__links.open { transform: translateX(0); }
  .nav__links a { font-size: 1.2rem; }
  .nav__burger { display: flex; z-index: 101; }
}

/* ── Hero ──────────────────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  background: var(--charcoal);
  display: flex; align-items: center;
  position: relative; overflow: hidden;
}
.hero--compact { min-height: 60vh; padding: 8rem 0 5rem; }
.hero::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(196, 135, 59, 0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero__content { position: relative; z-index: 1; }
.hero__eyebrow {
  font-size: 0.8rem; font-weight: 500; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 1.5rem;
}
.hero__title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.2; color: var(--off-white);
  max-width: 800px; margin-bottom: 1.5rem;
}
.hero__sub {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: rgba(253, 252, 251, 0.6);
  max-width: 650px; line-height: 1.7; margin-bottom: 2.5rem;
}
.hero__cta {
  display: inline-flex; align-items: center; gap: 0.75rem;
  padding: 0.9rem 2rem;
  border: 1px solid rgba(253, 252, 251, 0.25);
  border-radius: 2rem; color: var(--off-white);
  font-size: 0.9rem; font-weight: 500; letter-spacing: 0.02em;
  transition: all 0.35s ease;
}
.hero__cta:hover {
  background: var(--off-white); color: var(--charcoal);
  border-color: var(--off-white);
}
.hero__cta svg { transition: transform 0.3s; }
.hero__cta:hover svg { transform: translateX(4px); }

/* ── Section: Dark ─────────────────────────────────────────────────────── */
.section--dark {
  background: var(--charcoal); color: var(--off-white);
  padding: 7rem 0;
}
.section--dark .section__label { color: var(--accent); }
.section--dark .section__title { color: var(--off-white); }
.section--dark p { color: rgba(253, 252, 251, 0.7); }

.section--light { background: var(--off-white); padding: 7rem 0; }
.section--warm { background: var(--warm-grey); padding: 7rem 0; }

.section__label {
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 1rem;
}
.section__title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  line-height: 1.25; margin-bottom: 1.5rem;
  max-width: 800px;
}
.section__text {
  font-size: 1.05rem; line-height: 1.75; color: var(--mid-grey);
  max-width: 700px;
}

/* ── Problems grid ─────────────────────────────────────────────────────── */
.problems {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem; margin-top: 3rem;
}
.problem-card {
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.3s, transform 0.3s;
}
.problem-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.problem-card__icon { font-size: 1.5rem; margin-bottom: 1rem; opacity: 0.8; }
.problem-card__title { font-weight: 600; font-size: 1rem; margin-bottom: 0.5rem; }
.problem-card__text { font-size: 0.9rem; color: var(--mid-grey); line-height: 1.6; }

/* ── Services accordion ────────────────────────────────────────────────── */
.services-list { margin-top: 3rem; }
.service-item { border-top: 1px solid rgba(253, 252, 251, 0.12); overflow: hidden; }
.service-item:last-child { border-bottom: 1px solid rgba(253, 252, 251, 0.12); }
.service-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.8rem 0; cursor: pointer; user-select: none;
}
.service-header h3 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
}
.service-header .toggle {
  width: 32px; height: 32px; border-radius: 50%;
  border: 1px solid rgba(253, 252, 251, 0.25);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; transition: transform 0.4s, background 0.3s;
  flex-shrink: 0; color: var(--off-white);
}
.service-item.open .toggle {
  transform: rotate(45deg); background: var(--accent);
  border-color: var(--accent);
}
.service-body { max-height: 0; overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.16, 1, 0.3, 1); }
.service-body__inner {
  padding: 0 0 2rem 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;
}
@media (max-width: 600px) { .service-body__inner { grid-template-columns: 1fr; } }
.service-body p { font-size: 0.95rem; line-height: 1.7; color: rgba(253, 252, 251, 0.6); }
.service-body ul { list-style: none; padding: 0; }
.service-body ul li {
  font-size: 0.9rem; color: rgba(253, 252, 251, 0.6);
  padding: 0.3rem 0; padding-left: 1.2rem; position: relative;
}
.service-body ul li::before {
  content: ''; position: absolute; left: 0; top: 0.65rem;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}

/* ── Pricing ───────────────────────────────────────────────────────────── */
.pricing-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem; margin-top: 3rem;
}
.pricing-card {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 2.5rem 2rem; position: relative;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.pricing-card:hover { border-color: var(--accent); box-shadow: 0 8px 30px rgba(0,0,0,0.06); }
.pricing-card--featured { border-color: var(--accent); box-shadow: 0 8px 30px rgba(196, 135, 59, 0.1); }
.pricing-card__badge {
  position: absolute; top: -12px; left: 2rem;
  background: var(--accent); color: #fff;
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; padding: 0.3rem 1rem; border-radius: 1rem;
}
.pricing-card__name {
  font-weight: 600; font-size: 0.8rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--mid-grey); margin-bottom: 0.75rem;
}
.pricing-card__price {
  font-family: var(--serif); font-size: 2.5rem; font-weight: 400;
  margin-bottom: 0.25rem;
}
.pricing-card__price span { font-size: 1rem; color: var(--mid-grey); }
.pricing-card__setup {
  font-size: 0.85rem; color: var(--mid-grey); margin-bottom: 1.5rem;
  padding-bottom: 1.5rem; border-bottom: 1px solid var(--border);
}
.pricing-card ul { list-style: none; padding: 0; margin-bottom: 2rem; }
.pricing-card ul li {
  font-size: 0.9rem; padding: 0.45rem 0;
  padding-left: 1.5rem; position: relative; color: #444;
}
.pricing-card ul li::before {
  content: '\2713'; position: absolute; left: 0;
  color: var(--accent); font-weight: 700;
}
.pricing-card__cta {
  display: block; text-align: center;
  padding: 0.85rem; border-radius: 2rem;
  font-size: 0.9rem; font-weight: 500;
  border: 1px solid var(--charcoal); color: var(--charcoal);
  transition: all 0.3s;
}
.pricing-card__cta:hover { background: var(--charcoal); color: var(--off-white); }
.pricing-card--featured .pricing-card__cta {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.pricing-card--featured .pricing-card__cta:hover { background: var(--accent-light); }

/* ── Comparison table ──────────────────────────────────────────────────── */
.compare-table { width: 100%; border-collapse: collapse; margin-top: 2rem; font-size: 0.9rem; }
.compare-table th {
  text-align: left; padding: 1rem; font-weight: 600;
  border-bottom: 2px solid var(--charcoal); font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.compare-table td { padding: 1rem; border-bottom: 1px solid var(--border); color: #444; }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .highlight { color: var(--accent); font-weight: 600; }

/* ── Why Us / Reasons ──────────────────────────────────────────────────── */
.reasons { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; margin-top: 3rem; }
@media (max-width: 700px) { .reasons { grid-template-columns: 1fr; } }
.reason__number {
  font-family: var(--serif); font-size: 2rem;
  color: var(--accent); margin-bottom: 0.5rem; opacity: 0.6;
}
.reason__title { font-weight: 600; font-size: 1.05rem; margin-bottom: 0.5rem; }
.reason__text { font-size: 0.9rem; line-height: 1.7; color: var(--mid-grey); }

/* ── About ─────────────────────────────────────────────────────────────── */
.bio-grid {
  display: grid; grid-template-columns: 180px 1fr; gap: 3rem;
  margin-top: 3rem; align-items: start;
}
@media (max-width: 700px) { .bio-grid { grid-template-columns: 1fr; } }
.bio__avatar {
  width: 180px; height: 180px;
  background: var(--charcoal);
  border: 2px solid var(--accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif);
  font-size: 3.5rem; font-weight: 400;
  color: var(--accent);
  letter-spacing: -0.05em;
}
.bio__name { font-family: var(--serif); font-size: 1.6rem; margin-bottom: 0.25rem; }
.bio__role {
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 1.25rem;
}
.bio__text { font-size: 1rem; line-height: 1.8; color: #444; margin-bottom: 1rem; }
.bio__tags { margin-top: 1.5rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.bio__tag {
  font-size: 0.75rem; padding: 0.35rem 0.9rem;
  border: 1px solid var(--border); border-radius: 1rem;
  color: var(--mid-grey);
}

/* ── Portfolio / Case study ────────────────────────────────────────────── */
.portfolio-card {
  display: block;
  background: var(--charcoal); color: var(--off-white);
  border: 1px solid rgba(253, 252, 251, 0.1);
  border-radius: 12px; overflow: hidden;
  padding: 3rem; margin-top: 3rem;
  transition: border-color 0.3s, transform 0.3s;
}
.portfolio-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.portfolio-card__eyebrow {
  font-size: 0.8rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 1rem;
}
.portfolio-card__title {
  font-family: var(--serif); font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  margin-bottom: 1rem; line-height: 1.3;
}
.portfolio-card__summary {
  color: rgba(253, 252, 251, 0.65); line-height: 1.7;
  font-size: 0.95rem; margin-bottom: 1.75rem; max-width: 700px;
}
.portfolio-card__metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem; margin: 2rem 0;
}
.metric__value {
  font-family: var(--serif); font-size: 1.8rem; color: var(--accent);
  line-height: 1.1;
}
.metric__label {
  font-size: 0.75rem; color: rgba(253, 252, 251, 0.5);
  text-transform: uppercase; letter-spacing: 0.05em; margin-top: 0.4rem;
}
.portfolio-card__link {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.9rem; color: var(--off-white);
  border-bottom: 1px solid var(--accent); padding-bottom: 0.25rem;
}
.portfolio-card__link svg { transition: transform 0.3s; }
.portfolio-card:hover .portfolio-card__link svg { transform: translateX(4px); }

/* Compact grid layout — for /work/ index when 1-3+ cards are shown together */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.75rem; margin-top: 3rem;
}
.case-grid .portfolio-card {
  padding: 2rem; margin-top: 0;
  display: flex; flex-direction: column;
}
.case-grid .portfolio-card__title {
  font-size: 1.25rem; margin-bottom: 0.75rem;
}
.case-grid .portfolio-card__summary {
  font-size: 0.9rem; line-height: 1.6;
  margin-bottom: 1.25rem; max-width: none;
}
.case-grid .portfolio-card__metrics {
  grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1rem 0 1.5rem;
}
.case-grid .metric__value { font-size: 1.4rem; }
.case-grid .metric__label { font-size: 0.65rem; }
.case-grid .portfolio-card__link { margin-top: auto; font-size: 0.85rem; }

/* ── Case study page ───────────────────────────────────────────────────── */
.case-hero {
  background: var(--charcoal); color: var(--off-white);
  padding: 9rem 0 5rem;
}
.case-hero__eyebrow {
  font-size: 0.8rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1.25rem;
}
.case-hero__title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.2; margin-bottom: 1.5rem;
  max-width: 900px;
}
.case-hero__sub {
  color: rgba(253, 252, 251, 0.65);
  line-height: 1.75; font-size: 1.05rem;
  max-width: 700px;
}
.case-hero__metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 2rem; margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid rgba(253, 252, 251, 0.1);
}

.case-body {
  padding: 5rem 0;
}
.case-body h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  margin: 3.5rem 0 1.25rem;
  line-height: 1.3;
}
.case-body h2:first-child { margin-top: 0; }
.case-body h3 {
  font-size: 1.15rem; font-weight: 600;
  margin: 2rem 0 0.75rem;
}
.case-body p {
  font-size: 1rem; line-height: 1.8; color: #333;
  margin-bottom: 1.25rem;
  max-width: 780px;
}
.case-body ul, .case-body ol {
  margin: 0 0 1.5rem 1.25rem; max-width: 780px;
}
.case-body ul li, .case-body ol li {
  font-size: 1rem; line-height: 1.8; color: #333;
  margin-bottom: 0.5rem;
}
.case-body ul li::marker { color: var(--accent); }
.case-body ol li::marker { color: var(--accent); font-weight: 700; }
.case-body strong { color: var(--charcoal); font-weight: 600; }

.case-body__tech-table {
  width: 100%; border-collapse: collapse; margin: 1.5rem 0;
  font-size: 0.92rem;
}
.case-body__tech-table th {
  text-align: left; padding: 0.9rem 1rem;
  background: var(--warm-grey);
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em;
  font-weight: 600; border-bottom: 2px solid var(--charcoal);
}
.case-body__tech-table td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border); color: #333;
  vertical-align: top;
}
.case-body__tech-table tr:last-child td { border-bottom: none; }
.case-body__tech-table td:first-child { font-weight: 600; color: var(--charcoal); white-space: nowrap; }

.mermaid-wrap {
  background: #fff; border: 1px solid var(--border);
  border-radius: 12px; padding: 2rem 1.5rem;
  margin: 2rem 0; overflow-x: auto;
}
.mermaid { font-family: var(--sans) !important; }

.highlight-box {
  background: var(--warm-grey);
  border-left: 3px solid var(--accent);
  padding: 1.5rem 1.75rem; margin: 2rem 0;
  border-radius: 4px;
}
.highlight-box strong { color: var(--charcoal); }

/* ── Security page ─────────────────────────────────────────────────────── */
.pillars {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem; margin-top: 3rem;
}
.pillar {
  padding: 2.25rem 2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  transition: border-color 0.3s, transform 0.3s;
}
.pillar:hover { border-color: var(--accent); transform: translateY(-2px); }
.pillar__icon { font-size: 1.75rem; color: var(--accent); margin-bottom: 0.75rem; }
.pillar__title {
  font-family: var(--serif); font-size: 1.25rem; margin-bottom: 0.75rem;
}
.pillar__text { font-size: 0.95rem; line-height: 1.7; color: var(--mid-grey); }

.control-list {
  list-style: none; padding: 0; margin-top: 1.5rem;
}
.control-list li {
  padding: 1rem 0 1rem 2rem;
  border-bottom: 1px solid var(--border);
  position: relative;
  font-size: 0.95rem; line-height: 1.65; color: #333;
}
.control-list li:last-child { border-bottom: none; }
.control-list li::before {
  content: ''; position: absolute; left: 0; top: 1.3rem;
  width: 10px; height: 10px; border-radius: 50%;
}
.control-list li.status-live::before { background: #4a8754; }
.control-list li.status-progress::before { background: var(--accent); }
.control-list li .status-label {
  display: inline-block;
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.15rem 0.6rem; border-radius: 1rem;
  margin-left: 0.75rem;
  vertical-align: middle;
}
.control-list li.status-live .status-label { background: rgba(74, 135, 84, 0.12); color: #4a8754; }
.control-list li.status-progress .status-label { background: rgba(196, 135, 59, 0.12); color: var(--accent); }

/* ── Contact ───────────────────────────────────────────────────────────── */
.contact-form { max-width: 600px; margin-top: 2rem; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 1rem;
  border: 1px solid var(--border); border-radius: 6px;
  font-family: var(--sans); font-size: 0.95rem;
  margin-bottom: 1rem; background: #fff;
  transition: border-color 0.3s;
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-color: var(--accent);
}
.contact-form textarea { resize: vertical; min-height: 140px; }
.contact-form button {
  padding: 0.9rem 2.5rem; border: none; border-radius: 2rem;
  background: var(--charcoal); color: var(--off-white);
  font-family: var(--sans); font-size: 0.9rem; font-weight: 500;
  cursor: pointer; transition: background 0.3s;
}
.contact-form button:hover { background: var(--accent); }

/* ── Footer ────────────────────────────────────────────────────────────── */
.footer {
  background: var(--charcoal); color: rgba(253,252,251,0.4);
  padding: 3rem 0; text-align: center; font-size: 0.85rem;
}
.footer a { color: var(--accent); }
.footer__top {
  font-family: var(--sans); font-weight: 600; font-size: 1rem;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--off-white); margin-bottom: 1rem;
}
.footer__top span { color: var(--accent); }
.footer__links {
  margin: 1rem 0; display: flex; justify-content: center;
  gap: 1.5rem; flex-wrap: wrap;
}
.footer__links a {
  color: rgba(253, 252, 251, 0.5);
  font-size: 0.8rem; letter-spacing: 0.05em;
  text-transform: uppercase;
}
.footer__links a:hover { color: var(--off-white); }

/* ── Divider ───────────────────────────────────────────────────────────── */
.divider {
  width: 60px; height: 2px; background: var(--accent); margin: 2rem 0;
}

/* ── Steps ─────────────────────────────────────────────────────────────── */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 3rem; }
@media (max-width: 700px) { .steps { grid-template-columns: 1fr; } }
.step__number {
  font-family: var(--serif); font-size: 3rem;
  color: var(--accent); opacity: 0.3; margin-bottom: 0.5rem;
}
.step__title { font-weight: 600; font-size: 1.05rem; margin-bottom: 0.5rem; }
.step__text { font-size: 0.9rem; color: var(--mid-grey); line-height: 1.6; }

/* ── Scroll progress bar ───────────────────────────────────────────────── */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 2px; z-index: 200;
  background: var(--accent); width: 0%; transition: width 0.1s;
}

/* ── Back link (case study) ────────────────────────────────────────────── */
.back-link {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.85rem; color: var(--mid-grey);
  margin-bottom: 2rem; transition: color 0.3s;
}
.back-link:hover { color: var(--accent); }