/* ISL Platform — Landing styles */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  --bg: #ffffff;
  --surface: #f8fafc;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #64748b;
  --accent: #1e40af;
  --accent-hover: #1e3a8a;
  --accent-soft: #eff6ff;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  margin: 0; padding: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--accent); color: #fff; }

a { color: inherit; text-decoration: none; transition: color 150ms; }
a:hover { color: var(--accent); }
button { font-family: inherit; }

/* === Buttons === */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 6px; font-weight: 500;
  font-size: 14px; cursor: pointer;
  border: 1px solid transparent; transition: all 150ms;
  font-family: var(--font-sans);
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 8px 16px -8px rgba(30,64,175,0.4); }
.btn-ghost { background: transparent; border-color: var(--border-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--text); background: var(--surface); }
.btn-light { background: #fff; color: #0f172a; }
.btn-light:hover { background: #f8fafc; }
.btn-dark { background: #0f172a; color: #fff; border-color: #0f172a; }
.btn-dark:hover { background: #1e293b; }

/* === Typography === */
.label {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-3);
}
.h-display { font-size: 64px; line-height: 1.05; letter-spacing: -0.025em; font-weight: 600; margin: 0; }
.h-large { font-size: 44px; line-height: 1.1; letter-spacing: -0.02em; font-weight: 600; margin: 0; }
.h-medium { font-size: 28px; line-height: 1.2; letter-spacing: -0.01em; font-weight: 600; margin: 0; }
.h-small { font-size: 18px; line-height: 1.3; font-weight: 600; margin: 0; }
.lead { font-size: 18px; line-height: 1.55; color: var(--text-2); margin: 0; }
.body { font-size: 15px; line-height: 1.6; color: var(--text-2); margin: 0; }

/* === Layout === */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.container-wide { max-width: 1320px; margin: 0 auto; padding: 0 32px; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 28px; transition: all 150ms;
}

.logos-row {
  display: flex; gap: 48px; align-items: center; justify-content: center;
  flex-wrap: wrap;
}
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform 0.2s;
}
.brand-mark:hover { transform: scale(1.05); }

/* === Wellfield mock === */
.wellfield-mock {
  position: relative; width: 100%; height: 100%; overflow: hidden;
  background: linear-gradient(180deg, #0c1220 0%, #050810 100%);
}
.wellfield-mock::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(59,130,246,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,130,246,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  transform: perspective(800px) rotateX(58deg) translateY(20px) scale(1.6);
  transform-origin: center bottom;
}
.wellfield-mock .well {
  position: absolute; width: 6px; height: 32px; border-radius: 3px;
  box-shadow: 0 0 8px currentColor;
}

/* === Mobile === */
@media (max-width: 1024px) {
  .h-display { font-size: 48px; }
  .h-large { font-size: 36px; }
  .section { padding: 72px 0; }
  .container, .container-wide { padding: 0 24px; }
  .grid-2-1 { grid-template-columns: 1fr !important; gap: 48px !important; }
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr) !important; }
  .grid-cols-5 { grid-template-columns: repeat(2, 1fr) !important; }
  .hide-tablet { display: none !important; }
}
@media (max-width: 720px) {
  .h-display { font-size: 36px; }
  .h-large { font-size: 28px; }
  .h-medium { font-size: 22px; }
  .lead { font-size: 16px; }
  .section { padding: 56px 0; }
  .container, .container-wide { padding: 0 20px; }
  .grid-cols-4 { grid-template-columns: 1fr !important; }
  .grid-cols-5 { grid-template-columns: 1fr 1fr !important; }
  .grid-cols-3 { grid-template-columns: 1fr !important; }
  .hide-mobile { display: none !important; }
  .mobile-stack { flex-direction: column !important; align-items: stretch !important; }
  .mobile-stack > * { width: 100% !important; }
  .mobile-hide-nav { display: none !important; }
  .top-bar-wide { display: none !important; }
  .hamburger-btn { display: flex !important; }
}

/* === Animations === */
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.15); opacity: 0.4; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp 600ms cubic-bezier(0.2, 0.8, 0.2, 1) both; }

/* Hover affordances */
.feature-cell { transition: background 200ms, transform 200ms; cursor: pointer; }
.feature-cell:hover { background: var(--accent-soft) !important; }
.feature-cell:hover .feature-arrow { transform: translateX(4px); color: var(--accent); }
.feature-arrow { transition: all 200ms; color: var(--text-3); }

.module-row { transition: background 200ms; }
.module-row:hover { background: var(--accent-soft); }

.team-card { transition: transform 200ms, box-shadow 200ms; }
.team-card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px -12px rgba(15,23,42,0.15); }