:root {
  color-scheme: light;
  --text: #202733;
  --muted: #5c6675;
  --line: #d9e1ea;
  --brand: #165c7d;
  --brand-dark: #0d3548;
  --accent: #c87b2c;
  --bg-soft: #f3f7fa;
  --footer: #152536;
  --max: 1080px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.65;
}

body.dark-mode {
  color: #e7edf4;
  background: #0e1824;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.site-header {
  background: var(--footer);
}

.wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 18px 0;
}

.logo {
  flex: 0 0 auto;
}

.logo img {
  width: 260px;
  height: auto;
  display: block;
}

.menu-inner {
  flex: 1 1 auto;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 0;
  min-height: 48px;
  background: #fff;
}

.nav {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  font-size: 1rem;
  font-weight: 700;
}

.nav a {
  display: flex;
  align-items: center;
  color: var(--footer);
  min-height: 48px;
  padding: 0 25px;
  border: 1px solid transparent;
  border-right: 1px solid var(--line);
}

.nav a:hover {
  background: var(--footer);
  border-color: #fff;
  color: #fff;
  text-decoration: none;
}

.theme-toggle {
  align-self: center;
  width: 38px;
  height: 38px;
  margin-right: 8px;
  border: 1px solid var(--footer);
  border-radius: 0;
  background: #fff;
  color: var(--footer);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--footer);
  color: #fff;
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  display: block;
  margin: 0 auto;
}

.cover {
  min-height: 360px;
  background: #e6eef4 url("/assets/prepinsider-cover.jpg") center / cover no-repeat;
}

.cover-text {
  min-height: 360px;
  display: flex;
  align-items: center;
}

.content {
  padding: 44px 0 56px;
}

body.dark-mode .content {
  background: #0e1824;
}

.content.narrow {
  max-width: 850px;
}

h1,
h2 {
  line-height: 1.2;
  color: var(--brand-dark);
}

body.dark-mode h1,
body.dark-mode h2 {
  color: #f3f7fb;
}

h1 {
  margin: 0 0 24px;
  font-size: clamp(2rem, 4vw, 3rem);
}

h2 {
  margin: 42px 0 14px;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

p {
  margin: 0 0 18px;
  font-size: 1.06rem;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 10px;
}

.review-card {
  display: block;
  padding: 28px;
  min-height: 150px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--brand-dark);
}

body.dark-mode .review-card {
  border-color: #2b3d51;
  background: #152536;
  color: #fff;
}

.review-card strong {
  display: block;
  font-size: 1.35rem;
  line-height: 1.25;
}

.site-footer {
  background: var(--footer);
  color: #fff;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding: 32px 0;
}

.footer-links a {
  color: #fff;
  font-weight: 700;
}

.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  padding: 18px 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .header-inner {
    align-items: stretch;
    flex-direction: column;
    gap: 14px;
  }

  .logo img {
    width: 230px;
  }

  .nav {
    flex: 1;
  }

  .nav a {
    min-height: 44px;
    padding: 0 14px;
  }

  .menu-inner {
    gap: 0;
  }

  .cover,
  .cover-text {
    min-height: 240px;
  }

  .content {
    padding: 34px 0 44px;
  }

  .review-grid {
    grid-template-columns: 1fr;
  }
}