:root {
  --navy-900: #0b1e33;
  --navy-800: #0f2740;
  --navy-700: #14304f;
  --navy-600: #1c3f63;
  --teal: #4fd6c9;
  --teal-dark: #2fb9ac;
  --ink: #142433;
  --ink-soft: #4a5b6b;
  --bg-light: #eef2f4;
  --white: #ffffff;
  --border-soft: #dde4e8;
  --radius: 14px;
  --max-width: 1200px;
  --shadow-card: 0 10px 30px rgba(15, 39, 64, 0.08);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 {
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 5vw, 3.4rem); line-height: 1.08; }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); line-height: 1.15; margin-bottom: 20px; }
h3 { font-size: 1.15rem; margin-bottom: 8px; }

p { margin: 0 0 12px; color: var(--ink-soft); }

.eyebrow {
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--teal-dark);
  margin-bottom: 16px;
}
.eyebrow-light { color: var(--teal); }

.body-lg { font-size: 1.1rem; max-width: 620px; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--teal);
  color: var(--navy-900);
}
.btn-primary:hover { background: var(--teal-dark); }
.btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: var(--white);
  background: transparent;
  padding: 10px 22px;
}
.btn-outline:hover { background: rgba(255,255,255,0.1); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--navy-800);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.logo {
  color: var(--white);
  font-weight: 800;
  font-size: 1.2rem;
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo span { color: var(--teal); }
.main-nav {
  display: flex;
  gap: 32px;
}
.main-nav a {
  color: rgba(255,255,255,0.78);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.main-nav a:hover { color: var(--white); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--white);
  display: block;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--navy-800), var(--navy-700));
  color: var(--white);
  padding: 120px 0 100px;
}
.hero-inner { max-width: 760px; }
.hero h1 { color: var(--white); margin-bottom: 24px; }
.hero-sub { color: rgba(255,255,255,0.75); font-size: 1.15rem; max-width: 620px; margin-bottom: 32px; }

/* Sections */
section { padding: 100px 0; }
.outcomes { background: var(--bg-light); }
.depth { background: var(--bg-light); }

.summit-model {
  background: var(--bg-light);
}
.model-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
}
.model-copy .eyebrow, .model-copy h2, .model-copy p { color: var(--ink-soft); }
.model-copy h2 { color: var(--ink); }
.model-copy .eyebrow { color: var(--teal-dark); }
.model-card {
  background: var(--navy-800);
  color: var(--white);
  border-radius: var(--radius);
  padding: 36px;
}
.model-card h3 { color: var(--white); font-size: 1.5rem; }
.model-card p { color: rgba(255,255,255,0.75); margin: 0; }

.solutions, .what-we-build, .how-it-works {
  background: var(--navy-900);
  color: var(--white);
}
.solutions h2, .what-we-build h2, .how-it-works h2 { color: var(--white); }
.solutions-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
.solutions-intro p { color: rgba(255,255,255,0.72); font-size: 1.05rem; }

.why-summit-teams { background: var(--bg-light); }
.intro-lead { max-width: 720px; margin-bottom: 44px; font-size: 1.3rem; color: var(--ink); }

/* Grid */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Cards */
.card {
  background: var(--white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(15,39,64,0.12); }
.card p { margin: 0; font-size: 0.95rem; }

.card-dark {
  background: var(--navy-700);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: none;
}
.card-dark h3 { color: var(--white); }
.card-dark p { color: rgba(255,255,255,0.7); }
.card-dark:hover { transform: translateY(-3px); background: var(--navy-600); }

.numbered-grid .num {
  display: block;
  color: var(--teal);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}
.why-summit-teams .num { color: var(--teal-dark); }

/* Tags */
.tag-list { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.tag {
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--white);
}

/* Contact */
.contact { background: var(--navy-800); color: var(--white); }
.contact h2 { color: var(--white); }
.contact .body-lg { color: rgba(255,255,255,0.75); margin-bottom: 40px; }
.contact-inner { max-width: 760px; }

.talent-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 0.85rem; font-weight: 600; color: rgba(255,255,255,0.8); }
.field input, .field select, .field textarea {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 10px;
  padding: 13px 16px;
  color: var(--white);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.field input::placeholder, .field textarea::placeholder { color: rgba(255,255,255,0.4); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--teal);
  background: rgba(255,255,255,0.1);
}
.field select option { color: #000; }
.field.invalid input, .field.invalid select, .field.invalid textarea {
  border-color: #ff6b6b;
}
.error {
  color: #ff9b9b;
  font-size: 0.82rem;
  min-height: 1em;
  display: block;
}
.talent-form .btn { align-self: flex-start; margin-top: 8px; }
.form-status {
  font-size: 0.95rem;
  font-weight: 600;
  min-height: 1.2em;
}
.form-status.success { color: var(--teal); }
.form-status.error { color: #ff9b9b; }

/* Footer */
.site-footer {
  background: var(--navy-900);
  color: rgba(255,255,255,0.6);
  padding: 48px 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.footer-nav { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-nav a { color: rgba(255,255,255,0.6); text-decoration: none; font-size: 0.9rem; }
.footer-nav a:hover { color: var(--white); }
.footer-copy { font-size: 0.85rem; margin: 0; width: 100%; text-align: center; }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .model-inner { grid-template-columns: 1fr; }
  .solutions-intro { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  section { padding: 72px 0; }
  .hero { padding: 96px 0 72px; }
  .main-nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--navy-800);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .main-nav.open { max-height: 320px; }
  .main-nav a { padding: 16px 32px; border-top: 1px solid rgba(255,255,255,0.06); }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}