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

:root {
  --bg-deep: #060E1A;
  --bg-card: #0B1828;
  --bg-card2: #0F2035;
  --border: #1A3050;
  --teal: #00C9A7;
  --teal-dark: #009E85;
  --text-primary: #EDF2F7;
  --text-secondary: #7A9BB5;
  --text-muted: #3D5A73;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

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

/* NAV */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 14, 26, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
}
.nav-brand .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 8px var(--teal);
}
.nav-links {
  display: flex;
  gap: 2rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.nav-links a:hover { color: var(--teal); }

/* HERO */
.hero {
  padding: 5rem 2rem 4rem;
  max-width: 900px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 100px;
  border: 1px solid rgba(0,201,167,0.3);
  background: rgba(0,201,167,0.08);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--teal);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}
.hero h1 span { color: var(--teal); }
.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* CARDS GRID */
.cards-section {
  padding: 2rem 2rem 5rem;
  max-width: 1100px;
  margin: 0 auto;
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 1.5rem;
}
@media (max-width: 680px) {
  .cards-grid { grid-template-columns: 1fr; }
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
  display: block;
}
.case-card:hover {
  border-color: rgba(0,201,167,0.4);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1rem;
}
.tag {
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}
.card-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.card-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.metric-val {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--teal);
  letter-spacing: -0.02em;
}
.metric-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

.card-arrow {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--teal);
  margin-top: 1.25rem;
}

/* CASE STUDY DETAIL */
.detail-container {
  max-width: 820px;
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--teal); }

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1.5rem;
}
.detail-h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}
.detail-type {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.detail-type::before {
  content: '';
  display: inline-block;
  width: 24px; height: 2px;
  background: var(--teal);
}

/* METRICS BAR */
.metrics-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 3rem;
}
.metrics-bar .metric-item {
  background: var(--bg-card);
  padding: 1.5rem;
  text-align: center;
}
.metrics-bar .metric-item .val {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--teal);
  letter-spacing: -0.03em;
}
.metrics-bar .metric-item .lbl {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* CONTENT SECTIONS */
.content-section {
  margin-bottom: 2.5rem;
}
.content-section h2 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--text-primary);
}
.content-section p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}
.content-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.content-section ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.content-section ul li::before {
  content: '';
  flex-shrink: 0;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--teal);
  margin-top: 8px;
}

/* QUOTE */
.quote-block {
  border-left: 3px solid var(--teal);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: var(--bg-card2);
  border-radius: 0 12px 12px 0;
}
.quote-block p {
  font-size: 1rem;
  font-style: italic;
  color: var(--text-primary) !important;
  line-height: 1.7;
}

/* TIMELINE */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 1rem;
}
.tl-item {
  display: flex;
  gap: 1.5rem;
  padding-bottom: 1.75rem;
  position: relative;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 100px;
}
.tl-date {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--teal);
  white-space: nowrap;
}
.tl-line {
  width: 2px;
  flex: 1;
  background: var(--border);
  margin-top: 8px;
}
.tl-item:last-child .tl-line { display: none; }
.tl-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal);
  flex-shrink: 0;
  margin-top: 4px;
}
.tl-content {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-top: 2px;
  line-height: 1.6;
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (max-width: 600px) {
  nav { padding: 0 1rem; }
  .hero { padding: 3rem 1rem 2rem; }
  .cards-section, .detail-container { padding-left: 1rem; padding-right: 1rem; }
  .metrics-bar { grid-template-columns: repeat(2, 1fr); }
}