:root {
  --primary-bg: #ffffff;
  --primary-text: #1d1d1f;
  --secondary-text: #6e6e73;
  --accent-blue: #0071e3;
  --panel-bg: #f5f5f7;
  --border-color: #e5e5e7;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  background: var(--primary-bg);
  color: var(--primary-text);
  font-family: var(--font-base);
  line-height: 1.7;
}

body.dark-mode,
html.dark-mode {
  --primary-bg: #0d0d0f;
  --primary-text: #f5f5f7;
  --secondary-text: #a1a1a6;
  --panel-bg: #1d1d1f;
  --border-color: #424245;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--primary-bg) 94%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

nav {
  max-width: 1100px;
  height: 60px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  color: var(--accent-blue);
  font-size: 1.35rem;
  font-weight: 750;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.navlinks,
.nav-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.navlinks a {
  color: var(--secondary-text);
  text-decoration: none;
  font-size: 0.92rem;
}

.navlinks a:hover,
.page a:hover,
.footer-links a:hover {
  color: var(--accent-blue);
}

.theme-toggle {
  appearance: none;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--primary-bg);
  color: var(--primary-text);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  padding: 0.5rem 0.9rem;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 44px 24px 72px;
}

.eyebrow {
  color: var(--accent-blue);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin: 0 0 16px;
}

.dek {
  color: var(--secondary-text);
  font-size: 1.18rem;
  line-height: 1.55;
  margin: 0 0 22px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  color: var(--secondary-text);
  font-size: 0.92rem;
  margin: 0 0 32px;
  padding: 16px 0;
}

section {
  margin-bottom: 28px;
}

h2 {
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 0 0 10px;
}

p,
li {
  font-size: 1.02rem;
  margin: 0 0 14px;
}

ul {
  margin: 0 0 14px 20px;
  padding: 0;
}

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

.page-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 36px 0 24px;
}

.page-links a,
.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0 16px;
  text-decoration: none;
}

.back-link {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #ffffff;
}

.back-link:hover {
  opacity: 0.92;
  color: #ffffff;
}

footer {
  background: var(--panel-bg);
  border-top: 1px solid var(--border-color);
  color: var(--secondary-text);
  font-size: 0.9rem;
  padding: 28px 24px 34px;
}

.footer-inner {
  max-width: 860px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 12px;
}

.footer-links a {
  color: var(--secondary-text);
  text-decoration: none;
}

@media (max-width: 700px) {
  nav,
  .page {
    padding-left: 16px;
    padding-right: 16px;
  }

  .navlinks {
    gap: 12px;
  }

  .theme-toggle {
    padding: 0.5rem 0.75rem;
  }

  .dek {
    font-size: 1.05rem;
  }
}

@media (max-width: 560px) {
  .navlinks {
    display: none;
  }
}