/* Inquiry Mathematics Resources — shared site styles */

:root {
  --bg: #faf5eb;
  --surface: #ffffff;
  --header-bg: #cdae7d;
  --header-bg-dark: #b8955f;
  --text: #2e2a25;
  --text-muted: #5c564c;
  --accent: #a5312f;
  --accent-dark: #7d2321;
  --border: #e4d9c4;
  --card-bg: #fffdf9;
  --max-width: 900px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--accent-dark);
  line-height: 1.25;
}

h1 {
  font-size: 2.1rem;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.5rem;
  margin-top: 2.2rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.4rem;
}

h3 {
  font-size: 1.2rem;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

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

a:hover {
  text-decoration: underline;
}

p {
  margin: 0 0 1rem;
}

/* Header / nav */

header.site-header {
  background: var(--header-bg);
  border-bottom: 3px solid var(--header-bg-dark);
}

.nav-wrap {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.site-title {
  font-family: Georgia, serif;
  font-weight: bold;
  font-size: 1.15rem;
  color: #3a2e1e;
}

.site-title a {
  color: inherit;
}

.site-title a:hover {
  text-decoration: none;
}

nav.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin: 0;
  padding: 0;
}

nav.main-nav a {
  color: #3a2e1e;
  font-weight: 600;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
}

nav.main-nav a:hover,
nav.main-nav a.active {
  border-bottom: 2px solid var(--accent-dark);
  text-decoration: none;
}

/* Hero */

.hero {
  background: linear-gradient(135deg, #8a6b3f, #6e5330);
  color: #fff;
  padding: 3rem 1.5rem;
  text-align: center;
}

.hero h1 {
  color: #fff;
  font-size: 2.4rem;
  margin: 0;
}

.hero p {
  color: #f1e6cf;
  max-width: 640px;
  margin: 0.8rem auto 0;
  font-size: 1.05rem;
}

/* Layout */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.page-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.2rem 1.5rem 0.5rem;
}

.lede {
  font-size: 1.08rem;
  color: var(--text-muted);
}

/* Cards (resource sections, grid) */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.1rem;
  margin: 1.8rem 0;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.3rem;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

.card:hover {
  box-shadow: 0 4px 14px rgba(60, 45, 20, 0.12);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
}

.card a.card-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
}

/* Video sections */

.video-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.4rem 1.5rem;
  margin: 1.6rem 0;
}

.video-embed {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 */
  margin: 1rem 0;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
}

.video-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
  margin-top: 0.8rem;
  padding: 0;
  list-style: none;
}

.resource-links li::before {
  content: "\1F4C4  ";
}

.notice {
  background: #f4ead2;
  border: 1px solid var(--header-bg-dark);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  color: #4a3a1c;
  margin: 1.2rem 0;
}

/* Signup box */

.signup-box {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.6rem;
  text-align: center;
  margin: 1.8rem 0;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  margin-top: 0.6rem;
}

.btn:hover {
  background: var(--accent-dark);
  text-decoration: none;
}

/* Footer */

footer.site-footer {
  background: #3a2e1e;
  color: #e7dcc4;
  text-align: center;
  padding: 1.8rem 1.5rem;
  font-size: 0.9rem;
}

footer.site-footer a {
  color: #f1e6cf;
}

/* Sequence order note */

.sequence-note {
  font-style: italic;
  color: var(--text-muted);
  margin-top: -0.5rem;
}

@media (max-width: 600px) {
  .hero h1 { font-size: 1.8rem; }
  nav.main-nav ul { gap: 0.9rem; }
}