@import url('https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@400;600&display=swap');

:root {
  --bg: #f5f7fa;
  --primary: #2563eb;
  --accent: #6366f1;
  --text: #1e1e1e;
  --muted: #6b6b6b;
  --card-bg: #ffffff;
  --shadow: rgba(0, 0, 0, 0.1);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Source Sans Pro', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1rem;
}
.site-header {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  box-shadow: 0 1px 6px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  color: #fff;
}
.logo {
  margin: 0;
  font-size: 1.5rem;
  color: #fff;
}
.site-nav a {
  margin-left: 1rem;
  text-decoration: none;
  color: #fff;
  opacity: 0.85;
  font-weight: 500;
}
.site-nav a:hover, .site-nav a.active {
  color: var(--accent);
  opacity: 1;
}
.hero {
  text-align: center;
  padding: 6rem 1rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
}
.hero .subtitle {
  margin-top: 0.5rem;
  font-size: 1.25rem;
  opacity: 0.9;
}
.hero h2 {
  margin-top: 0;
  font-weight: 600;
}
.lookup-form {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}
.lookup-form input {
  padding: 0.8rem 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
  width: 280px;
}
.lookup-form button {
  background: var(--accent);
  border: none;
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}
.lookup-form button:hover {
  background: #4f46e5;
}
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  padding: 3rem 0;
}
.card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 16px var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  text-align: center;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow);
}
.card a {
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
}
main.container {
  padding: 2rem 0;
}
.card.diagnostic-card {
  max-width: 500px;
  margin: 1rem auto;
  text-align: left;
}
.diagnostic-form {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.tutor-form {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
}
.form-group label {
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.diagnostic-form select,
.diagnostic-form button,
.tutor-form input,
.tutor-form textarea,
.tutor-form button {
  padding: 0.75rem 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
}
.diagnostic-form button,
.tutor-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  align-self: flex-start;
}
.diagnostic-form button:hover,
.tutor-form button:hover {
  background: #4f46e5;
}
.book-list {
  list-style: disc;
  margin-left: 1.5rem;
}
footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: auto;
  background: var(--card-bg);
}

/* Timeline table styling */
.plan-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  box-shadow: 0 2px 8px var(--shadow);
  background: var(--card-bg);
}
.plan-table th,
.plan-table td {
  padding: 0.75rem 1rem;
  border: 1px solid #e5e7eb;
}
.plan-table th {
  background: var(--primary);
  color: #fff;
  text-align: center;
}
.plan-table td {
  text-align: left;
  vertical-align: top;
}
.plan-table tr:nth-child(even) td {
  background: #f1f5f9;
}

.calendar-export {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
}
.calendar-export button {
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
}
.calendar-export button:hover {
  background: #4f46e5;
}

.pagination {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}
.pagination button {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.pagination button:disabled {
  opacity: 0.5;
  cursor: default;
}
@media (max-width: 600px) {
  .lookup-form { flex-direction: column; }
  .site-nav a { margin-left: 0.5rem; }
}