/* Site-wide styles. Change the colors here and every page updates.
   Colors and fonts are taken from the book cover. */
:root {
  --sky: #6fa9d2;        /* cover sky blue */
  --sky-deep: #4a87b0;   /* back cover blue */
  --sage: #c9d3a6;       /* pale yellow-green in the cover sky */
  --teal: #4e8b8c;       /* the ground strip at the bottom of the cover */
  --teal-dark: #2f6566;
  --bg: #f6f8f4;
  --text: #24353d;
  --muted: #5c6d73;
  --card: #ffffff;
  --border: #dbe4e0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Ubuntu", "Segoe UI", sans-serif;
  font-size: 18px;
  line-height: 1.65;
}

h1, h2, h3, .site-title {
  font-family: "Belleza", "Optima", "Candara", sans-serif;
  font-weight: normal;
}

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

/* Top bar */
.topbar {
  background: var(--teal);
  padding: 12px 20px;
  text-align: center;
}
.topbar a {
  color: #fff;
  text-decoration: none;
  margin: 0 14px;
  letter-spacing: 0.03em;
}
.topbar a:hover { text-decoration: underline; }

/* Big cover-style banner on the home page */
.hero {
  background: linear-gradient(180deg, var(--sky) 0%, var(--sky) 45%, var(--sage) 100%);
  color: #fff;
  text-align: center;
  padding: 64px 20px 56px;
  border-bottom: 18px solid var(--teal);
}
.hero h1 {
  font-size: clamp(2.4rem, 7vw, 4rem);
  line-height: 1.1;
  margin: 0 auto 24px;
  max-width: 12em;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}
.hero .subtitle {
  font-size: 1.15rem;
  max-width: 32em;
  margin: 0 auto 20px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}
.hero .author { font-size: 1.1rem; margin: 0; letter-spacing: 0.04em; }

/* Smaller banner for inner pages */
.page-header {
  background: var(--sky-deep);
  color: #fff;
  text-align: center;
  padding: 36px 20px;
  border-bottom: 10px solid var(--teal);
}
.page-header h1 { margin: 0; font-size: 2.2rem; }
.page-header p { margin: 8px 0 0; opacity: 0.9; }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

h2 {
  color: var(--teal-dark);
  font-size: 1.7rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  margin-top: 44px;
}

.lead {
  font-size: 1.3rem;
  color: var(--sky-deep);
  font-style: italic;
}

.closing {
  font-family: "Belleza", "Optima", sans-serif;
  font-size: 1.5rem;
  color: var(--teal-dark);
  text-align: center;
  margin: 36px 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 5px solid var(--sky);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 16px 0;
}

.button {
  display: inline-block;
  background: var(--teal);
  color: #fff;
  text-decoration: none;
  padding: 10px 22px;
  border-radius: 6px;
}
.button:hover { background: var(--teal-dark); }

/* Resource lists */
.resources { list-style: none; padding: 0; }
.resources li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 0 0 12px;
}
.resources a { font-weight: bold; }
.resources .note { display: block; color: var(--muted); font-size: 0.95rem; }

footer {
  background: var(--teal);
  color: #e6f0ee;
  text-align: center;
  padding: 20px;
  font-size: 0.9rem;
}