:root {
  --deep: #0b3d59;
  --sea: #1f7a8c;
  --foam: #e8f4f7;
  --sand: #f6f1e7;
  --ink: #16242b;
  --maxw: 1000px;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color: var(--ink);
  line-height: 1.6;
  background: #fff;
}
img { display: block; max-width: 100%; }
a { color: var(--sea); }

.wrap { width: min(100% - 2rem, var(--maxw)); margin-inline: auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(11, 61, 89, 0.97);
  backdrop-filter: blur(6px);
  z-index: 10;
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 0; }
.brand { color: #fff; font-weight: 700; font-size: 1.15rem; text-decoration: none; }
.nav nav { display: flex; align-items: center; gap: 1.25rem; }
.nav nav a { color: var(--foam); text-decoration: none; }
.nav nav a:hover { color: #fff; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--sea);
  color: #fff;
  padding: 0.8rem 1.6rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.2s ease;
}
.btn:hover { background: var(--deep); transform: translateY(-2px); }
.btn-sm { padding: 0.5rem 1rem; }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--deep), var(--sea));
  color: #fff;
  padding: clamp(3rem, 12vw, 7rem) 0;
  text-align: center;
}
.hero h1 { font-size: clamp(2rem, 6vw, 3.25rem); line-height: 1.1; }
.hero .lead { max-width: 46ch; margin: 1.25rem auto 2rem; font-size: clamp(1.05rem, 2.6vw, 1.25rem); color: var(--foam); }

/* Sections */
.section { padding: clamp(2.5rem, 8vw, 5rem) 0; }
.section-alt { background: var(--sand); }
.section h2 { font-size: clamp(1.5rem, 4vw, 2.25rem); text-align: center; color: var(--deep); margin-bottom: 2rem; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); gap: 1.5rem; }
.card {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
  text-align: center;
}
.card h3 { color: var(--sea); margin-bottom: 0.5rem; }
.card .price { font-size: 1.75rem; font-weight: 700; color: var(--deep); margin-bottom: 0.5rem; }

.about, .book { max-width: 60ch; margin-inline: auto; text-align: center; }
.book .contact { margin-top: 1rem; font-size: 1.1rem; display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* Footer */
.site-footer { background: var(--deep); color: var(--foam); text-align: center; padding: 2.5rem 0; }
.site-footer .tiny { font-size: 0.85rem; opacity: 0.7; margin-top: 0.5rem; }

/* Nav: wrap on narrow screens, mark the current page */
.nav { flex-wrap: wrap; gap: 0.75rem; }
.nav nav { flex-wrap: wrap; }
.nav nav a[aria-current="page"] { color: #fff; font-weight: 600; }

/* Inner-page hero: shorter than the home hero */
.page-hero { padding: clamp(2.5rem, 8vw, 4rem) 0; }

/* Home: three quick reasons */
.points { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 1.5rem; text-align: center; }
.points h3 { color: var(--deep); margin-bottom: 0.35rem; }
.center { text-align: center; margin-top: 2rem; }

/* Tours page: details under each card */
.card ul { list-style: none; padding: 0; margin: 1rem 0 1.5rem; text-align: left; }
.card li { padding: 0.35rem 0; border-top: 1px solid #eee; }
.card li:first-child { border-top: 0; }
.fineprint { max-width: 60ch; margin: 2.5rem auto 0; text-align: center; font-size: 0.95rem; color: #4a5a61; }

/* Contact page */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 1.5rem; }
.contact-grid .card { text-align: left; }
.contact-grid dt { font-weight: 600; color: var(--deep); margin-top: 0.75rem; }
.contact-grid dd { margin: 0; }

/* Booking placeholder notice */
.notice {
  max-width: 60ch;
  margin: 0 auto 2rem;
  padding: 1rem 1.25rem;
  background: var(--foam);
  border-left: 4px solid var(--sea);
  border-radius: 8px;
}

/* Footer: fictional-business notice */
.site-footer .demo-notice {
  max-width: 60ch;
  margin: 1rem auto 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(232, 244, 247, 0.25);
  font-size: 0.9rem;
}
.site-footer a { color: #fff; }