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

:root {
  --bg:            #09090E;
  --bg-card:       #0F0F16;
  --bg-card-hover: #141420;
  --text:          #EEEEF0;
  --text-muted:    rgba(238,238,240,0.45);
  --text-dim:      rgba(238,238,240,0.18);
  --blue:          #5AC8FA;
  --border:        rgba(238,238,240,0.07);
  --border-hover:  rgba(238,238,240,0.14);
  --radius:        14px;
  --radius-lg:     20px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Instrument Sans', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── NAV ──────────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  transition: background 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}
nav.scrolled {
  background: rgba(9,9,14,0.85);
  border-color: var(--border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.nav-mc-logo { height: 16px; width: auto; display: block; transition: opacity 0.2s; }
.nav-mc-logo:hover { opacity: 0.8; }

/* Case study nav back + CTA */
.nav-back { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--text-muted); font-size: 13px; transition: color 0.2s, opacity 0.2s; }
.nav-back:hover { color: var(--text); opacity: 0.8; }
.nav-back svg { width: 14px; height: 14px; }
.nav-cta { display: inline-flex; align-items: center; gap: 6px; padding: 7px 16px; border-radius: 40px; border: 1px solid rgba(var(--accent-rgb), 0.35); color: var(--accent); font-size: 12px; font-weight: 500; letter-spacing: 0.02em; text-decoration: none; transition: background 0.2s, border-color 0.2s; }
.nav-cta:hover { background: rgba(var(--accent-rgb), 0.08); border-color: rgba(var(--accent-rgb), 0.6); }
.nav-cta svg { width: 12px; height: 12px; }

/* ── CASE STUDY HERO ──────────────────────────────────────── */
.case-hero { padding: 140px 24px 100px; max-width: 900px; margin: 0 auto; }
.hero-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 36px; }
.tag { font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; padding: 5px 12px; border-radius: 40px; border: 1px solid var(--border); color: var(--text-muted); white-space: nowrap; }
.tag.accent { color: var(--accent); border-color: rgba(var(--accent-rgb), 0.3); background: rgba(var(--accent-rgb), 0.06); }
.tag.live { color: #30D158; border-color: rgba(48,209,88,0.3); background: rgba(48,209,88,0.06); }
.tag.coming-soon { color: #FF9F0A; border-color: rgba(255,159,10,0.3); background: rgba(255,159,10,0.06); }
.hero-name { font-family: 'Bricolage Grotesque', sans-serif; font-size: clamp(56px, 10vw, 112px); font-weight: 800; line-height: 0.92; letter-spacing: -0.04em; color: var(--text); opacity: 0; animation: fadeUp 0.9s ease 0.1s forwards; }
.hero-name span { color: var(--accent); }
.hero-subtitle { margin-top: 20px; font-family: 'Bricolage Grotesque', sans-serif; font-size: clamp(18px, 2.8vw, 28px); font-weight: 300; color: var(--text-muted); letter-spacing: -0.02em; opacity: 0; animation: fadeUp 0.9s ease 0.25s forwards; }
.hero-intro { margin-top: 28px; font-size: 17px; line-height: 1.65; color: var(--text-muted); max-width: 620px; opacity: 0; animation: fadeUp 0.9s ease 0.4s forwards; }
.hero-meta { display: flex; gap: 40px; flex-wrap: wrap; margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); opacity: 0; animation: fadeUp 0.9s ease 0.55s forwards; }
.hero-meta-label { font-size: 10px; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 6px; }
.hero-meta-value { font-size: 14px; font-weight: 500; color: var(--text-muted); }
.hero-divider { margin-top: 64px; width: 100%; height: 1px; background: linear-gradient(90deg, var(--accent), transparent); opacity: 0.25; }

/* ── IMAGES ───────────────────────────────────────────────── */
.hero-image { max-width: 1080px; margin: 0 auto; padding: 0 24px 48px; }
.hero-image img { width: 100%; border-radius: var(--radius-lg); border: 1px solid var(--border); display: block; }

.inline-image { max-width: 900px; margin: 0 auto; padding: 0 24px 80px; }
.inline-image img { width: 100%; border-radius: var(--radius-lg); border: 1px solid var(--border); display: block; }
.inline-image figcaption { margin-top: 12px; font-size: 12px; color: var(--text-dim); text-align: center; letter-spacing: 0.02em; }

.image-grid { max-width: 900px; margin: 0 auto; padding: 0 24px 80px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.image-grid figure { border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.image-grid img { width: 100%; display: block; }
.image-grid figcaption { padding: 10px 14px; font-size: 12px; color: var(--text-dim); background: var(--bg-card); border-top: 1px solid var(--border); }

/* ── CONTENT SECTIONS ─────────────────────────────────────── */
.content-section { max-width: 900px; margin: 0 auto; padding: 0 24px 100px; }
.section-eyebrow { font-size: 11px; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); margin-bottom: 28px; }
.section-heading { font-family: 'Bricolage Grotesque', sans-serif; font-size: clamp(28px, 4vw, 44px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.1; color: var(--text); margin-bottom: 48px; }
.section-intro { font-size: 16px; line-height: 1.7; color: var(--text-muted); max-width: 640px; margin-bottom: 40px; margin-top: -24px; }
.section-divider { width: 100%; height: 1px; background: var(--border); max-width: 900px; margin: 0 auto 100px; }

/* ── CHALLENGE GRID ───────────────────────────────────────── */
.challenge-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.challenge-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; position: relative; overflow: hidden; }
.challenge-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--accent), transparent); opacity: 0.4; }
.challenge-num { font-family: 'Bricolage Grotesque', sans-serif; font-size: 48px; font-weight: 800; color: rgba(var(--accent-rgb), 0.1); line-height: 1; margin-bottom: 16px; letter-spacing: -0.04em; }
.challenge-title { font-family: 'Bricolage Grotesque', sans-serif; font-size: 18px; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-bottom: 10px; }
.challenge-desc { font-size: 14px; line-height: 1.65; color: var(--text-muted); }

/* ── APPROACH ─────────────────────────────────────────────── */
.approach-list { display: flex; flex-direction: column; }
.approach-item { display: grid; grid-template-columns: 80px 1fr; gap: 24px; padding: 40px 0; border-bottom: 1px solid var(--border); }
.approach-item:first-child { border-top: 1px solid var(--border); }
.approach-num { font-family: 'Bricolage Grotesque', sans-serif; font-size: 64px; font-weight: 800; color: var(--text-dim); line-height: 1; letter-spacing: -0.05em; }
.approach-title { font-family: 'Bricolage Grotesque', sans-serif; font-size: 22px; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-bottom: 10px; }
.approach-desc { font-size: 15px; line-height: 1.65; color: var(--text-muted); }
.approach-visuals { margin-top: 20px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.approach-visuals figure { border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.approach-visuals img { width: 100%; display: block; }
.approach-visuals figcaption { padding: 10px 14px; font-size: 12px; color: var(--text-dim); background: var(--bg-card); border-top: 1px solid var(--border); letter-spacing: 0.02em; }
.approach-visual-full { margin-top: 12px; border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; }
.approach-visual-full img { width: 100%; display: block; }
.approach-visual-full figcaption { padding: 10px 14px; font-size: 12px; color: var(--text-dim); background: var(--bg-card); border-top: 1px solid var(--border); letter-spacing: 0.02em; }

/* ── FEATURES ─────────────────────────────────────────────── */
.features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border); border-top: 2px solid rgba(var(--accent-rgb), 0.5); border-radius: var(--radius-lg); padding: 28px; }
.feature-title { font-family: 'Bricolage Grotesque', sans-serif; font-size: 17px; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-bottom: 8px; }
.feature-desc { font-size: 14px; line-height: 1.6; color: var(--text-muted); }

/* ── NEXT STEPS ───────────────────────────────────────────── */
.next-steps { display: flex; flex-direction: column; }
.next-step { display: flex; gap: 20px; align-items: flex-start; padding: 24px 0; border-bottom: 1px solid var(--border); }
.next-step:first-child { border-top: 1px solid var(--border); }
.step-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); margin-top: 7px; flex-shrink: 0; }
.step-dot.wip { background: rgba(var(--accent-rgb), 0.4); border: 1px solid var(--accent); }
.step-title { font-size: 16px; font-weight: 500; color: var(--text); margin-bottom: 4px; }
.step-desc { font-size: 14px; line-height: 1.6; color: var(--text-muted); }

/* ── DISCOVERY ────────────────────────────────────────────── */
.discovery-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.discovery-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 32px; }
.discovery-icon { font-size: 22px; margin-bottom: 16px; }
.discovery-title { font-family: 'Bricolage Grotesque', sans-serif; font-size: 17px; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-bottom: 10px; }
.discovery-desc { font-size: 14px; line-height: 1.65; color: var(--text-muted); }

/* ── OPPORTUNITY ──────────────────────────────────────────── */
.opportunity-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.opportunity-item { padding: 28px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); position: relative; overflow: hidden; }
.opportunity-item::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, var(--accent), transparent); opacity: 0.35; }
.opportunity-icon { font-size: 20px; margin-bottom: 14px; }
.opportunity-title { font-family: 'Bricolage Grotesque', sans-serif; font-size: 16px; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-bottom: 8px; }
.opportunity-desc { font-size: 13px; line-height: 1.65; color: var(--text-muted); }

/* ── DECISION CALLOUT ─────────────────────────────────────── */
.decision-callout { margin-top: 20px; padding: 18px 22px; background: rgba(var(--accent-rgb), 0.04); border: 1px solid rgba(var(--accent-rgb), 0.15); border-left: 3px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; }
.decision-callout-label { font-size: 10px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
.decision-callout-text { font-size: 14px; line-height: 1.6; color: var(--text-muted); }

/* ── RESEARCH ─────────────────────────────────────────────── */
.research-eyebrow { font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); margin-top: 48px; margin-bottom: 20px; }
.research-quotes { margin-top: 40px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.research-quote { background: var(--bg-card); border: 1px solid var(--border); border-left: 3px solid rgba(var(--accent-rgb), 0.4); border-radius: var(--radius); padding: 24px 28px; }
.research-quote-text { font-size: 14px; line-height: 1.65; color: var(--text-muted); font-style: italic; margin-bottom: 14px; }
.research-quote-text::before { content: '\201C'; }
.research-quote-text::after  { content: '\201D'; }
.research-quote-source { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dim); }

/* ── QUOTES ───────────────────────────────────────────────── */
.quotes-list { display: flex; flex-direction: column; gap: 16px; }
.quote-block { background: var(--bg-card); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: 28px 32px; }
.quote-text { font-family: 'Bricolage Grotesque', sans-serif; font-size: clamp(17px, 2.2vw, 22px); font-weight: 300; line-height: 1.45; letter-spacing: -0.02em; color: var(--text); margin-bottom: 16px; }
.quote-text::before { content: '\201C'; }
.quote-text::after  { content: '\201D'; }
.quote-author { font-size: 12px; color: var(--text-dim); letter-spacing: 0.08em; text-transform: uppercase; }

/* ── REFLECTIONS ──────────────────────────────────────────── */
.reflection-list { display: flex; flex-direction: column; }
.reflection-item { display: grid; grid-template-columns: 44px 1fr; gap: 20px; padding: 36px 0; border-bottom: 1px solid var(--border); }
.reflection-item:first-child { border-top: 1px solid var(--border); }
.reflection-marker { font-family: 'Bricolage Grotesque', sans-serif; font-size: 22px; font-weight: 800; color: var(--text-dim); line-height: 1.3; }
.reflection-title { font-family: 'Bricolage Grotesque', sans-serif; font-size: 20px; font-weight: 600; letter-spacing: -0.02em; color: var(--text); margin-bottom: 8px; }
.reflection-desc { font-size: 15px; line-height: 1.65; color: var(--text-muted); }

/* ── SUBSECTION ───────────────────────────────────────────── */
.subsection-label { font-family: 'Bricolage Grotesque', sans-serif; font-size: 20px; font-weight: 700; letter-spacing: -0.02em; color: var(--text); margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.subsection-spacer { margin-top: 60px; }

/* ── CASE CTA ─────────────────────────────────────────────── */
.case-cta { max-width: 900px; margin: 0 auto; padding: 0 24px 140px; text-align: center; }
.cta-heading { font-family: 'Bricolage Grotesque', sans-serif; font-size: clamp(32px, 5vw, 56px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.1; color: var(--text); margin-bottom: 20px; }
.cta-sub { font-size: 16px; color: var(--text-muted); margin-bottom: 40px; }
.cta-btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 40px; background: var(--accent); color: #09090E; font-size: 15px; font-weight: 600; text-decoration: none; transition: opacity 0.2s, transform 0.2s; letter-spacing: -0.01em; }
.cta-btn:hover { opacity: 0.88; transform: translateY(-1px); }
.cta-btn svg { width: 16px; height: 16px; }

/* ── FOOTER ───────────────────────────────────────────────── */
footer { border-top: 1px solid var(--border); padding: 28px 40px; display: flex; align-items: center; justify-content: space-between; }
.footer-left { font-family: 'Bricolage Grotesque', sans-serif; font-size: 15px; font-weight: 700; letter-spacing: -0.03em; }
.footer-left .c { color: var(--blue); }
.footer-right { display: flex; align-items: center; gap: 20px; font-size: 13px; color: var(--text-dim); letter-spacing: 0.02em; }
.footer-dhd-logo { height: 12px; width: auto; opacity: 0.35; display: block; transition: opacity 0.2s; }
.footer-dhd-link { border-bottom: none; line-height: 0; }
.footer-dhd-link:hover .footer-dhd-logo { opacity: 0.7; }

/* ── CHAPTER NAV ──────────────────────────────────────────── */
.chapter-nav { position: sticky; top: 60px; z-index: 90; background: rgba(9,9,14,0.88); border-bottom: 1px solid var(--border); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); opacity: 0; transform: translateY(-4px); transition: opacity 0.3s ease, transform 0.3s ease; pointer-events: none; }
.chapter-nav.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.chapter-nav-inner { display: flex; overflow-x: auto; scrollbar-width: none; max-width: 920px; margin: 0 auto; padding: 0 24px; }
.chapter-nav-inner::-webkit-scrollbar { display: none; }
.chapter-nav-item { display: flex; align-items: center; padding: 13px 14px; font-size: 12px; font-weight: 500; letter-spacing: 0.04em; color: var(--text-dim); text-decoration: none; white-space: nowrap; border-bottom: 2px solid transparent; transition: color 0.2s, border-color 0.2s; position: relative; top: 1px; flex-shrink: 0; }
.chapter-nav-item:hover { color: var(--text-muted); }
.chapter-nav-item.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── NEXT PROJECT ─────────────────────────────────────────── */
.next-project { border-top: 1px solid var(--border); padding: 36px 40px; display: flex; align-items: center; justify-content: space-between; max-width: 100%; }
.next-project-label { font-size: 11px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); }
.next-project-link { display: inline-flex; align-items: center; gap: 10px; font-family: 'Bricolage Grotesque', sans-serif; font-size: 22px; font-weight: 700; letter-spacing: -0.02em; color: var(--text); text-decoration: none; transition: color 0.2s; }
.next-project-link:hover { color: var(--accent); }
.next-project-link svg { width: 18px; height: 18px; transition: transform 0.2s; }
.next-project-link:hover svg { transform: translateX(4px); }

/* ── REVEALS ──────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── ANIMATIONS ───────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
@keyframes pulse-line {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 700px) {
  nav { padding: 0 20px; }
  .discovery-grid, .challenge-grid, .opportunity-list, .approach-visuals,
  .research-quotes, .image-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .approach-item { grid-template-columns: 56px 1fr; }
  .approach-num { font-size: 44px; }
  .reflection-item { grid-template-columns: 32px 1fr; }
  .problem-item { grid-template-columns: 36px 1fr; }
  .next-project { padding: 28px 20px; }
  footer { flex-direction: column; gap: 8px; text-align: center; }
}