/* =========================================================
   Pupil - Open Source Computer Science Curriculum
   One stylesheet shared by every page
   ========================================================= */

/* ---------------- Global ---------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #222222;
  background-color: #eef2f6;
}

h1, h2, h3, h4 {
  margin-bottom: 10px;
  color: #14355c;
  line-height: 1.3;
}

h2 { font-size: 27px; }
h3 { font-size: 21px; margin-top: 4px; }
h4 { font-size: 17px; margin-top: 12px; }

p { margin-bottom: 10px; }

a { color: #0b5cab; }
a:hover { color: #08406f; }

hr {
  border: 0;
  border-top: 1px solid #d5dde5;
  margin: 26px 0;
}

img { max-width: 100%; }

/* ---------------- Header (same on every page) ---------------- */
.site-header {
  background-color: #14355c;
  color: #ffffff;
  padding: 14px 22px;
  border-bottom: 4px solid #ff9800;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.logo-icon {
  border-radius: 6px;
}

.site-header h1 {
  color: #ffffff;
  font-size: 26px;
  margin-bottom: 0;
}

.tagline {
  font-size: 13px;
  color: #cfd9e5;
  margin-bottom: 0;
}

.site-nav ul { list-style: none; margin: 0; }

.site-nav li {
  display: inline-block;
  margin: 0 4px 4px 0;
}

.site-nav a {
  display: inline-block;
  padding: 7px 14px;
  color: #ffffff;
  text-decoration: none;
  background-color: #1d4a7c;
  border-radius: 3px;
  font-size: 14px;
}

.site-nav a:hover { background-color: #2b6aad; color: #ffffff; }

.site-nav a.active {
  background-color: #ff9800;
  color: #14355c;
  font-weight: bold;
}

/* ---------------- Course switcher (course pages only) ---------------- */
.course-nav {
  background-color: #dbe5ef;
  padding: 9px 22px;
  border-bottom: 1px solid #c2d2e2;
}

.course-nav ul { list-style: none; margin: 0; }

.course-nav li {
  display: inline-block;
  margin: 0 4px 4px 0;
}

.course-nav a {
  display: inline-block;
  padding: 5px 11px;
  font-size: 13px;
  text-decoration: none;
  color: #14355c;
  background-color: #ffffff;
  border: 1px solid #b9cadb;
  border-radius: 3px;
}

.course-nav a:hover { background-color: #f0f5fa; }

.course-nav a.active {
  background-color: #14355c;
  color: #ffffff;
  border-color: #14355c;
  font-weight: bold;
}

/* ---------------- Main ---------------- */
main {
  max-width: 1000px;
  margin: 22px auto;
  padding: 26px;
  background-color: #ffffff;
  border: 1px solid #d9e0e7;
  border-radius: 5px;
}

section { margin-bottom: 28px; }

.lead {
  font-size: 17px;
  color: #445566;
  margin-bottom: 18px;
}

.breadcrumb {
  font-size: 13px;
  color: #667788;
}

.breadcrumb span { color: #14355c; font-weight: bold; }

ul, ol, dl { margin-left: 24px; margin-bottom: 12px; }

li { margin-bottom: 4px; }

dt { font-weight: bold; margin-top: 10px; color: #14355c; }
dd { margin-left: 20px; }

blockquote {
  border-left: 4px solid #ff9800;
  background-color: #fdf6ea;
  padding: 12px 16px;
  font-style: italic;
  margin-bottom: 8px;
}

mark { background-color: #ffe9b8; }

code {
  font-family: "Courier New", Courier, monospace;
  font-size: 14px;
  background-color: #eef2f6;
  padding: 1px 4px;
  border-radius: 3px;
}

pre {
  background-color: #1e2530;
  color: #e6edf3;
  padding: 14px 16px;
  overflow-x: auto;
  border-radius: 4px;
  border-left: 4px solid #ff9800;
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 13.5px;
  line-height: 1.55;
}

details {
  border: 1px solid #d9e0e7;
  padding: 9px 13px;
  margin-bottom: 8px;
  background-color: #fafbfc;
  border-radius: 3px;
}

summary { cursor: pointer; font-weight: bold; color: #14355c; }

/* ---------------- Images ---------------- */
.banner {
  width: 100%;
  border-radius: 5px;
  margin-bottom: 16px;
  display: block;
}

.video-thumb {
  width: 420px;
  max-width: 100%;
  border-radius: 5px;
  border: 1px solid #d9e0e7;
  display: block;
  margin-bottom: 8px;
}

.video-thumb:hover { opacity: 0.9; }

video {
  max-width: 100%;
  border-radius: 5px;
  border: 1px solid #d9e0e7;
  background-color: #000000;
}

/* ---------------- Hero ---------------- */
.hero {
  background-color: #f2f7fc;
  border: 1px solid #d3e2f0;
  padding: 20px;
  border-radius: 5px;
}

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-block;
  padding: 9px 17px;
  margin: 4px 5px 4px 0;
  background-color: #0b5cab;
  color: #ffffff;
  text-decoration: none;
  border: 1px solid #0b5cab;
  border-radius: 3px;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
}

.btn:hover { background-color: #094a8b; color: #ffffff; }

.btn-alt {
  background-color: #ff9800;
  border-color: #ff9800;
  color: #14355c;
  font-weight: bold;
}

.btn-alt:hover { background-color: #e08600; color: #14355c; }

.btn-line {
  background-color: #ffffff;
  color: #0b5cab;
}

.btn-line:hover { background-color: #eaf1f8; color: #0b5cab; }

.prev-next {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

/* ---------------- Course cards ---------------- */
.card-area {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.card {
  flex: 1 1 290px;
  max-width: 340px;
  border: 1px solid #d9e0e7;
  border-radius: 5px;
  padding: 14px;
  background-color: #fcfdfe;
  display: flex;
  flex-direction: column;
}

.card img {
  width: 100%;
  border-radius: 4px;
  display: block;
  margin-bottom: 10px;
}

.card h3 { font-size: 18px; margin-top: 0; }

.card ul { font-size: 14px; margin-bottom: 10px; }

.card p:last-child { margin-top: auto; margin-bottom: 0; }

.open-text { color: #1b7a32; font-weight: bold; }

/* ---------------- Tables ---------------- */
table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 14px;
}

caption {
  text-align: left;
  font-size: 14px;
  color: #667788;
  padding-bottom: 7px;
}

th, td {
  border: 1px solid #d5dde5;
  padding: 9px 11px;
  text-align: left;
  font-size: 15px;
  vertical-align: top;
}

thead th {
  background-color: #14355c;
  color: #ffffff;
}

tbody tr:nth-child(even) { background-color: #f5f8fa; }

tfoot td {
  font-weight: bold;
  background-color: #eaf1f8;
}

.info-table th {
  background-color: #eaf1f8;
  color: #14355c;
  width: 190px;
}

/* ---------------- Forms ---------------- */
fieldset {
  border: 1px solid #d5dde5;
  padding: 16px;
  margin-bottom: 16px;
  border-radius: 4px;
  background-color: #fcfdfe;
}

legend {
  font-weight: bold;
  color: #14355c;
  padding: 0 7px;
}

label { font-size: 15px; }

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
select,
textarea {
  width: 100%;
  max-width: 420px;
  padding: 8px;
  border: 1px solid #b9c4cf;
  border-radius: 3px;
  font-family: inherit;
  font-size: 15px;
  background-color: #ffffff;
}

input[type="radio"],
input[type="checkbox"] { margin-right: 5px; }

input:focus, select:focus, textarea:focus {
  outline: 2px solid #2b6aad;
  outline-offset: 1px;
}

progress { width: 260px; height: 18px; vertical-align: middle; }

meter { width: 200px; height: 18px; vertical-align: middle; }

/* ---------------- Result messages ---------------- */
.success {
  color: #14612a;
  background-color: #e6f5ea;
  border: 1px solid #b6dfc2;
  padding: 11px 14px;
  border-radius: 4px;
  font-weight: bold;
}

.error {
  color: #9c2020;
  background-color: #fdecec;
  border: 1px solid #f2bcbc;
  padding: 11px 14px;
  border-radius: 4px;
  font-weight: bold;
}

.review-box {
  border: 1px solid #d5dde5;
  background-color: #fafbfc;
  padding: 12px 16px;
  border-radius: 4px;
  margin-top: 12px;
}

/* ---------------- Footer (same on every page) ---------------- */
.site-footer {
  background-color: #14355c;
  color: #dfe7f0;
  padding: 26px 22px 16px 22px;
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  border-top: 4px solid #ff9800;
}

.site-footer h4 {
  color: #ffffff;
  border-bottom: 1px solid #2b6aad;
  padding-bottom: 6px;
  margin-top: 0;
}

.footer-col {
  flex: 1;
  min-width: 210px;
  font-size: 14px;
}

.site-footer ul { list-style: none; margin-left: 0; }

.site-footer a { color: #ffd08a; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; color: #ffd08a; }

.site-footer address { font-style: normal; }

.copy {
  width: 100%;
  text-align: center;
  border-top: 1px solid #2b6aad;
  padding-top: 14px;
  font-size: 13px;
  color: #b9c9dc;
  margin-bottom: 0;
}

/* ---------------- Small screens ---------------- */
@media (max-width: 700px) {
  main { padding: 16px; margin: 12px; }
  .site-nav li, .course-nav li { display: block; }
  .site-nav a, .course-nav a { display: block; }
  .card { max-width: 100%; }

  /* wide tables scroll sideways instead of stretching the whole page */
  table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }
  .info-table th { width: auto; }
  progress, meter { width: 100%; }
}

/* ---------------- Card topic tags ---------------- */
.tags {
  font-size: 12.5px;
  color: #5a6b7c;
  background-color: #f2f6fa;
  border: 1px solid #e0e8ef;
  border-radius: 3px;
  padding: 6px 9px;
  margin-bottom: 10px;
}

.tags strong { color: #14355c; }