:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-text: #1e293b;
  --color-text-muted: #55627a;
  --color-border: #e2e8f0;
  --color-accent: #0891b2;
  --color-accent-dark: #0e7490;
  --color-ink: #0f172a;
  --radius: 10px;
  --max-width: 1080px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

img, svg {
  max-width: 100%;
}

a {
  color: var(--color-accent-dark);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-ink);
}

.brand img {
  width: 40px;
  height: 40px;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-suffix {
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.main-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.main-nav a:hover {
  color: var(--color-accent-dark);
}

.lang-switch {
  display: flex;
  gap: 4px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 3px;
}

.lang-switch button {
  border: none;
  background: transparent;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text-muted);
}

.lang-switch button.active {
  background: var(--color-ink);
  color: #fff;
}

/* Hero */
.hero {
  padding: 72px 0 56px;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, #ffffff 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.hero-text {
  flex: 1 1 420px;
}

.hero-logo {
  flex: 0 0 auto;
  width: 160px;
}

.hero h1 {
  font-size: 2.2rem;
  line-height: 1.25;
  margin: 0 0 16px;
  color: var(--color-ink);
}

.hero p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 46ch;
  margin: 0 0 24px;
}

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: 12px;
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.15s ease;
}

.btn:hover {
  background: var(--color-accent-dark);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-alt);
  color: var(--color-ink);
}

/* Sections */
section {
  padding: 64px 0;
}

section h2 {
  font-size: 1.6rem;
  color: var(--color-ink);
  margin: 0 0 12px;
}

.section-lead {
  color: var(--color-text-muted);
  max-width: 68ch;
  margin: 0 0 40px;
}

.about {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}

.about .container {
  max-width: 760px;
}

.about p {
  color: var(--color-text);
}

.about strong {
  color: var(--color-ink);
}

/* Activity cards */
.activities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #fff;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  transform: translateY(-2px);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-dark);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--color-ink);
}

.card p {
  color: var(--color-text-muted);
  margin: 0;
  flex: 1;
}

.card .btn,
.card .btn-secondary {
  align-self: flex-start;
  margin-top: 4px;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent-dark);
  background: #ecfeff;
  border: 1px solid #a5f3fc;
  padding: 2px 10px;
  border-radius: 999px;
  width: fit-content;
}

/* Contact */
.contact {
  background: var(--color-ink);
  color: #e2e8f0;
}

.contact h2 {
  color: #fff;
}

.contact .section-lead {
  color: #b6c2d9;
}

.contact a {
  color: #67e8f9;
}

.contact-details {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  margin-top: 8px;
}

.contact-item dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #8fa1c2;
  margin-bottom: 4px;
}

.contact-item dd {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.contact-item dd.riddle {
  font-size: 0.95rem;
  font-weight: 400;
  font-style: italic;
  color: #b6c2d9;
  max-width: 42ch;
}

/* Footer */
.site-footer {
  padding: 24px 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
}

@media (max-width: 640px) {
  .site-header .container {
    justify-content: center;
    text-align: center;
  }
  .hero {
    text-align: center;
  }
  .hero .container {
    justify-content: center;
  }
  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
}