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

:root {
  --summit-navy: #002855;
  --summit-blue: #0056b3;
  --summit-sky: #4a90c4;
  --summit-light: #eef5fb;
  --summit-pale: #f7fbff;
  --summit-white: #ffffff;
  --summit-ink: #1a2b3c;
  --summit-muted: #4d6a85;
  --summit-line: #d4e4f2;
  --summit-gold: #c9922a;
  --shadow: 0 18px 48px rgba(0, 40, 85, 0.12);
  --radius: 14px;
  --max: 1120px;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Montserrat", "Segoe UI", Arial, sans-serif;
  color: var(--summit-ink);
  background: var(--summit-white);
  line-height: 1.65;
}

body.nav-open { overflow: hidden; }

img { max-width: 100%; display: block; }

a { color: inherit; }

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 0.75rem 1rem;
  background: var(--summit-gold);
  color: var(--summit-navy);
  font-weight: 700;
}

.skip-link:focus { left: 1rem; top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(0, 40, 85, 0.96);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 88px;
  padding: 0.65rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 1.35rem;
  text-decoration: none;
  color: var(--summit-white);
}

.brand-mark {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand img,
.brand-logo {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  border-radius: 50%;
  object-fit: contain;
  background: transparent;
}

.brand-tagline {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.1rem;
  margin-left: 0.35rem;
  padding-left: 0.15rem;
  font-size: clamp(0.64rem, 1.7vw, 0.76rem);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.2;
  color: var(--summit-white);
}

.brand-tagline span {
  display: block;
  white-space: nowrap;
}

.nav-toggle,
.site-header nav {
  align-self: center;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-nav a:hover,
.site-nav a.active { color: var(--summit-gold); }

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  color: var(--summit-white);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.35rem;
}

.hero {
  position: relative;
  min-height: 72vh;
  display: grid;
  align-items: end;
  color: var(--summit-white);
  background:
    linear-gradient(180deg, rgba(0, 24, 52, 0.35) 0%, rgba(0, 40, 85, 0.82) 72%),
    url("/assets/img/summit/hero.jpg") center/cover no-repeat;
}

.hero .content {
  padding: 4.5rem 0 3.5rem;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.hero .lead {
  max-width: 42rem;
  margin: 0;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.92);
}

.section {
  padding: 4.5rem 0;
}

.section.light { background: var(--summit-light); }
.section.pale { background: var(--summit-pale); }

.section h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  color: var(--summit-navy);
  line-height: 1.15;
}

.section h3 {
  margin: 1.75rem 0 0.75rem;
  color: var(--summit-navy);
}

.section p,
.section li {
  color: var(--summit-muted);
}

.section p.lead {
  font-size: 1.08rem;
  color: var(--summit-blue);
}

.eyebrow {
  margin: 0 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--summit-sky);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--summit-white);
  border: 1px solid var(--summit-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 54px rgba(0, 40, 85, 0.16);
}

.card img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  width: 100%;
}

.card-body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.card-body h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  line-height: 1.35;
}

.card-body p {
  margin: 0;
  font-size: 0.92rem;
}

.card-body a {
  text-decoration: none;
  color: var(--summit-navy);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.8rem 1.35rem;
  border-radius: 6px;
  border: 2px solid transparent;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--summit-navy);
  color: var(--summit-white);
}

.btn-primary:hover { background: #003d7a; }

.btn-secondary {
  background: transparent;
  color: var(--summit-navy);
  border-color: var(--summit-navy);
}

.btn-secondary:hover {
  background: var(--summit-navy);
  color: var(--summit-white);
}

.btn-gold {
  background: var(--summit-gold);
  color: var(--summit-navy);
}

.btn-gold:hover { filter: brightness(1.05); }

.split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.split-panel a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  padding: 1.5rem;
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.split-panel .mentor {
  background: var(--summit-navy);
  color: var(--summit-white);
}

.split-panel .mentee {
  background: var(--summit-blue);
  color: var(--summit-white);
}

.video-frame {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #111;
}

.video-frame video,
.video-frame iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  display: block;
}

.quote-block {
  padding: 2rem;
  border-left: 4px solid var(--summit-gold);
  background: var(--summit-white);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow);
}

.quote-block p {
  margin: 0;
  font-size: 1.05rem;
  color: var(--summit-ink);
}

.newsletter {
  background: linear-gradient(135deg, var(--summit-navy), #003d7a);
  color: var(--summit-white);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}

.newsletter h2 { color: var(--summit-white); }

.newsletter-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.newsletter-form input {
  flex: 1 1 220px;
  min-height: 46px;
  border: 0;
  border-radius: 6px;
  padding: 0 1rem;
  font: inherit;
}

.newsletter-form button {
  min-height: 46px;
  border: 0;
  border-radius: 6px;
  padding: 0 1.25rem;
  background: var(--summit-gold);
  color: var(--summit-navy);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}

.form-status {
  margin-top: 0.75rem;
  font-size: 0.92rem;
}

.site-footer {
  background: var(--summit-navy);
  color: rgba(255, 255, 255, 0.86);
  padding: 2.5rem 0;
}

.site-footer .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.social-links {
  display: flex;
  gap: 0.85rem;
}

.social-links a {
  color: var(--summit-white);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-hero {
  padding: 4rem 0 2.5rem;
  background: linear-gradient(180deg, var(--summit-light), var(--summit-white));
}

.page-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--summit-navy);
}

.faq details {
  border: 1px solid var(--summit-line);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  background: var(--summit-white);
  margin-bottom: 0.75rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--summit-navy);
}

.faq details[open] summary { margin-bottom: 0.65rem; }

.involve-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.involve-card {
  padding: 1.35rem;
  border-radius: var(--radius);
  background: var(--summit-white);
  border: 1px solid var(--summit-line);
  box-shadow: var(--shadow);
}

.involve-card h3 {
  margin: 0 0 0.5rem;
  color: var(--summit-navy);
}

.prose {
  max-width: 760px;
}

.prose h2,
.prose h3,
.prose h4 { color: var(--summit-navy); }

.prose img {
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

@media (max-width: 900px) {
  .grid-2,
  .grid-3,
  .split-panel { grid-template-columns: 1fr; }

  .nav-toggle { display: block; }

  .brand img,
  .brand-logo {
    width: 68px;
    height: 68px;
  }

  .site-nav {
    position: fixed;
    inset: 76px 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.25rem 1.5rem 1.5rem;
    background: var(--summit-navy);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}