/* ===== Theme tokens ===== */
:root {
  --bg: #ffffff;
  --bg-alt: #f7f9f7;
  --text: #16191c;
  --text-muted: #5b6269;
  --accent: #1a8f5c;
  --accent-dark: #146e48;
  --accent-soft: #e6f5ee;
  --border: #e6e8e6;
  --card-bg: #ffffff;
  --radius: 8px;
  --max-width: 1000px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-heading: "Sora", var(--font);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141a;
    --bg-alt: #181b21;
    --text: #edf0ee;
    --text-muted: #9aa3a0;
    --accent: #33c17c;
    --accent-dark: #2aa869;
    --accent-soft: #16281f;
    --border: #262b27;
    --card-bg: #181b21;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== Nav ===== */
.site-nav {
  padding: 26px 0;
}
.site-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-nav .brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.site-nav .links a {
  margin-left: 28px;
  color: var(--text-muted);
  font-size: 0.92rem;
}
.site-nav .links a:hover { color: var(--accent); text-decoration: none; }

/* ===== Hero ===== */
.hero {
  padding: 88px 0 56px;
}
.hero .kicker {
  display: inline-block;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 18px;
  position: relative;
  padding-left: 18px;
}
.hero .kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 2px;
  background: var(--accent);
}
.hero h1 {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
  line-height: 1.08;
}
.hero .role {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 1.1rem;
  margin-bottom: 22px;
}
.hero p {
  color: var(--text-muted);
  max-width: 640px;
  font-size: 1.04rem;
}

/* ===== Case study cards ===== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  padding: 32px 0 88px;
}
.card {
  background: var(--card-bg);
  border-top: 3px solid var(--accent);
  border-radius: 2px;
  padding: 28px 26px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
a.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.08);
  text-decoration: none;
}
.card.placeholder {
  border-top-color: var(--border);
  opacity: 0.55;
}
.card-icon {
  width: 26px;
  height: 26px;
  color: var(--accent);
  margin-bottom: 4px;
}
.card.placeholder .card-icon { color: var(--text-muted); }
.card .tag {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
}
.card.placeholder .tag { color: var(--text-muted); }
.card h3 {
  font-family: var(--font-heading);
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}
.card p { margin: 0; color: var(--text-muted); font-size: 0.93rem; }
.card .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 12px;
}

/* ===== Case study quick-reference header ===== */
.cs-header {
  padding: 64px 0 32px;
  border-bottom: 1px solid var(--border);
}
.cs-header .eyebrow {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}
.cs-header h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 22px;
  font-size: 2.2rem;
  line-height: 1.15;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-bottom: 26px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.meta-grid .item .label {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  margin-bottom: 5px;
  font-weight: 700;
}
.meta-grid .item .value { font-size: 0.96rem; }

.exec-summary {
  color: var(--text);
  font-size: 1.05rem;
  max-width: 760px;
}

.verify {
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.72rem;
  padding: 1px 7px;
  border-radius: 4px;
  font-weight: 700;
  white-space: nowrap;
}

.placeholder-note {
  background: var(--bg-alt);
  border-left: 3px solid var(--border);
  border-radius: 0 4px 4px 0;
  padding: 14px 18px;
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 18px 0;
}

/* ===== Metrics strip ===== */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0;
  padding: 40px 0;
  border-bottom: 1px solid var(--border);
}
.metric {
  padding: 0 24px;
  border-left: 1px solid var(--border);
}
.metric:first-child { border-left: none; padding-left: 0; }
.metric .num {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
}
.metric .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  margin-top: 8px;
  overflow-x: auto;
}
.tab-btn {
  background: none;
  border: none;
  padding: 16px 18px;
  font-size: 0.92rem;
  font-family: var(--font);
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 700;
}

.tab-panel {
  display: none;
  padding: 36px 0 88px;
}
.tab-panel.active { display: block; }

.tab-panel h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.tab-panel h3 { font-size: 1.05rem; margin: 28px 0 10px; }
.tab-panel p, .tab-panel li { color: var(--text); font-size: 0.97rem; }
.tab-panel ul { padding-left: 20px; }

table.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.88rem;
}
table.data-table th, table.data-table td {
  text-align: left;
  padding: 11px 12px;
  border-bottom: 1px solid var(--border);
}
table.data-table th {
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}