:root {
  /* Hallam palette: navy chrome, yellow accents, white backgrounds. */
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #000000;
  --muted: #5a5d77;
  --border: #d9deea;
  --primary: #1C4587;       /* Hallam deep navy */
  --primary-dark: #1B3867;  /* Hallam darker navy */
  --accent: #FFFF00;        /* Hallam yellow (icon discs) */
  --accent-ink: #000000;    /* text colour over yellow */
  --highlight: #9900FF;     /* answer reveals */
  --success: #1f9d55;
  --success-bg: #e4f6ec;
  --danger: #d23c3c;
  --danger-bg: #fbe6e6;
  --code-bg: #0f1226;
  --code-text: #e6e7ef;
  --shadow-sm: 0 1px 2px rgba(20, 22, 50, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 22, 50, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Comic Sans MS", "Comic Sans", "Chalkboard SE", "Marker Felt",
    system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.logo-mark {
  width: 32px;
  height: 32px;
  display: inline-block;
  vertical-align: middle;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.15s, background 0.15s;
}

.site-nav a:hover { color: var(--text); background: var(--bg); }
.site-nav a.active { color: var(--primary); background: rgba(28, 69, 135, 0.1); }

/* Nav dropdown (Topics) */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 0;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--muted);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.nav-dropdown-toggle:hover { color: var(--text); background: var(--bg); }
.nav-dropdown-toggle.active { color: var(--primary); background: rgba(28, 69, 135, 0.1); }
.nav-chev {
  width: 10px;
  height: 7px;
  transition: transform 0.15s;
}
.nav-dropdown[data-open="true"] .nav-chev { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 170px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-md);
  padding: 6px;
  display: none;
  z-index: 20;
}
.nav-dropdown[data-open="true"] .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}
.nav-dropdown-menu a:hover { background: var(--bg); color: var(--primary); }
.nav-dropdown-menu a.active { color: var(--primary); background: rgba(28, 69, 135, 0.1); }

/* Hero */
.hero {
  background:
    radial-gradient(ellipse at top right, rgba(255, 255, 0, 0.22), transparent 60%),
    radial-gradient(ellipse at bottom left, rgba(28, 69, 135, 0.14), transparent 55%),
    var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 60px 0 70px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  margin: 12px 0 16px;
  letter-spacing: -0.02em;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0;
}

.lead {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 52ch;
  margin: 0 0 24px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-art {
  background: var(--code-bg);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero-art::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 16px;
  width: 48px;
  height: 10px;
  background:
    radial-gradient(circle at 5px 5px, #ff5f56 5px, transparent 5px),
    radial-gradient(circle at 21px 5px, #ffbd2e 5px, transparent 5px),
    radial-gradient(circle at 37px 5px, #27c93f 5px, transparent 5px);
}

.code-preview {
  margin: 24px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--code-text);
  white-space: pre;
  overflow-x: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.1s, background 0.15s, border-color 0.15s;
  font-family: inherit;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover { background: var(--primary-dark); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--surface); border-color: var(--muted); }

/* Sections */
.section { padding: 60px 0; }
.section h2 {
  font-size: 1.75rem;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
.section-sub { color: var(--muted); margin: 0 0 28px; max-width: 60ch; }

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  color: var(--text);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.card h3 { margin: 4px 0 0; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.card-link {
  margin-top: auto;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  padding-top: 8px;
}
.card-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Value grid */
.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.value {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.value h3 { margin-top: 0; font-size: 1.05rem; }
.value p { margin-bottom: 0; color: var(--muted); font-size: 0.95rem; }

.tip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 60px;
}

/* Page hero (inner pages) */
.page-hero {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 48px 0 36px;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  margin: 8px 0 12px;
  letter-spacing: -0.02em;
}

/* Lesson layout */
.lesson-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  padding: 40px 20px 64px;
  align-items: start;
}

.lesson-toc {
  position: sticky;
  top: 80px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}
.lesson-toc h4 {
  margin: 0 0 10px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.lesson-toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: toc;
}
.lesson-toc li { counter-increment: toc; font-size: 0.93rem; margin-bottom: 2px; }
.lesson-toc a {
  display: block;
  padding: 6px 8px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
}
.lesson-toc a:hover { background: var(--bg); color: var(--text); }

.lesson {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 40px;
  box-shadow: var(--shadow-sm);
}

.lesson section { margin-bottom: 36px; }
.lesson section:last-of-type { margin-bottom: 0; }
.lesson h2 {
  font-size: 1.5rem;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
  border-bottom: 2px solid var(--border);
  padding-bottom: 8px;
}
.lesson p { margin: 0 0 14px; }
.lesson code {
  background: #eef0fb;
  color: #2a2d4a;
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Code blocks */
.code {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0 0 16px;
  white-space: pre;
}
.c-keyword { color: #c792ea; }
.c-string { color: #c3e88d; }
.c-num { color: #f78c6c; }
.c-comment { color: #8b92b0; font-style: italic; }
.c-op { color: #89ddff; }

/* Callouts & extras */
.callout {
  background: #fff7e8;
  border-left: 4px solid #ffbe0b;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin: 12px 0 18px;
  font-size: 0.97rem;
}

.try-box {
  background: #eef6ff;
  border: 1px solid #c8dcf3;
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin: 14px 0 18px;
}
.try-box h4 { margin: 0 0 6px; color: #1d4e89; font-size: 0.95rem; }

.project {
  background: linear-gradient(135deg, #f0edff 0%, #fff3ec 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.project h2 { border-bottom: none; padding-bottom: 0; }

.tips, .steps {
  padding-left: 22px;
  margin: 8px 0 16px;
}
.tips li, .steps li { margin-bottom: 6px; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 18px;
  font-size: 0.95rem;
}
.data-table th, .data-table td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.data-table thead { background: var(--bg); }

.glossary { margin: 0; }
.glossary dt { font-weight: 700; margin-top: 10px; }
.glossary dd { margin: 2px 0 8px 0; color: var(--muted); }

.preview {
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 0 0 18px;
  background: #fafbff;
}
.preview-label {
  margin: 0 0 8px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.preview-body { margin: 0; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* Quiz */
.quiz-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
  background: var(--surface);
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 12px;
  width: fit-content;
  flex-wrap: wrap;
}
.quiz-tab {
  background: transparent;
  border: none;
  padding: 10px 18px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
}
.quiz-tab:hover { color: var(--text); }
.quiz-tab.active { background: var(--primary); color: white; }

.quiz {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--shadow-sm);
}

.quiz-q {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  margin: 0 0 16px;
}
.quiz-q legend {
  font-weight: 600;
  padding: 0 6px;
  font-size: 1rem;
}
.q-num { color: var(--primary); margin-right: 4px; }

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.12s, border-color 0.12s;
  font-size: 0.97rem;
}
.quiz-option:hover { background: var(--bg); }
.quiz-option input { margin-top: 3px; accent-color: var(--primary); }
.quiz-option.correct {
  background: var(--success-bg);
  border-color: var(--success);
}
.quiz-option.incorrect {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.quiz-feedback {
  margin: 10px 6px 0;
  font-size: 0.92rem;
  min-height: 0;
}
.quiz-feedback.correct { color: var(--success); }
.quiz-feedback.incorrect { color: var(--danger); }
.quiz-feedback:empty { display: none; }

.quiz-actions {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.quiz-result {
  margin-top: 18px;
  padding: 18px 22px;
  background: linear-gradient(135deg, #eef5ff 0%, #fef3ec 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.quiz-result h3 { margin: 0 0 6px; font-size: 1.2rem; }
.quiz-result p { margin: 0; color: var(--muted); }

/* Auth bar (injected into header by app.js) */
.auth-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.auth-form {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.auth-input {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 130px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.auth-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(28, 69, 135, 0.18);
}
.auth-btn {
  background: var(--primary);
  color: white;
  border: 1px solid var(--primary);
  border-radius: 8px;
  padding: 7px 14px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}
.auth-btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.auth-signout {
  background: transparent;
  color: var(--primary);
  border-color: var(--border);
}
.auth-signout:hover { background: var(--bg); color: var(--primary-dark); border-color: var(--primary); }
.auth-msg {
  font-size: 0.82rem;
  color: var(--muted);
}
.auth-msg.error { color: var(--danger); }

.auth-user {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px 4px 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
}
.auth-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  border: 2px solid var(--primary);
}
.auth-name { color: var(--text); }
.auth-meta {
  font-size: 0.78rem;
  color: var(--primary);
  background: white;
  border: 1px solid var(--border);
  padding: 1px 8px;
  border-radius: 999px;
  font-weight: 700;
}

/* Quiz scores badge (added above each quiz form by quiz.js) */
.quiz-scores {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 0 0 18px;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
}
.quiz-scores.hint { color: var(--muted); }
.score-pill {
  display: inline-flex;
  gap: 6px;
  align-items: baseline;
  padding: 4px 12px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.88rem;
}
.score-pill strong { color: var(--primary); font-weight: 700; }
.score-pill.best { background: var(--accent); border-color: var(--primary); }
.score-pill.best strong { color: var(--primary-dark); }
.score-meta {
  color: var(--muted);
  font-size: 0.82rem;
  margin-left: auto;
}

/* Auth gate: hide one or the other depending on signed-in state. */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
html[data-auth="in"]  .login-screen { display: none; }
html[data-auth="out"] .site-header,
html[data-auth="out"] main,
html[data-auth="out"] .site-footer { display: none; }

/* Login screen */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 255, 0, 0.25), transparent 55%),
    radial-gradient(circle at 80% 70%, rgba(28, 69, 135, 0.18), transparent 55%),
    var(--surface);
  position: relative;
  overflow: hidden;
}
.login-bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.55;
  pointer-events: none;
}
.login-bg-blob.blob-a {
  width: 320px; height: 320px;
  background: var(--accent);
  top: -60px; left: -80px;
}
.login-bg-blob.blob-b {
  width: 360px; height: 360px;
  background: var(--primary);
  bottom: -80px; right: -100px;
  opacity: 0.35;
}

.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 480px;
  background: white;
  border: 3px solid var(--primary);
  border-radius: 24px;
  padding: 28px 32px 32px;
  box-shadow:
    0 30px 60px rgba(28, 69, 135, 0.18),
    0 8px 16px rgba(28, 69, 135, 0.1);
  text-align: center;
}

.login-mascot {
  margin: -76px auto 4px;
  width: 180px;
  height: 180px;
}
.python-mascot {
  width: 100%;
  height: 100%;
  display: block;
  filter: drop-shadow(0 8px 14px rgba(28, 69, 135, 0.25));
  animation: mascot-bob 4s ease-in-out infinite;
}
@keyframes mascot-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}

.login-eyebrow {
  margin: 0;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.85rem;
}
.login-title {
  margin: 2px 0 8px;
  font-size: 2rem;
  color: var(--primary-dark);
}
.login-sub {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 1rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: stretch;
}
.login-input {
  font-family: inherit;
  font-size: 1.1rem;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 12px;
  text-align: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--bg);
}
.login-input:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 4px rgba(28, 69, 135, 0.18);
}
.login-btn {
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 13px 22px;
  border: 2px solid var(--primary);
  border-radius: 12px;
  background: var(--primary);
  color: white;
  cursor: pointer;
  transition: background 0.12s, transform 0.06s;
}
.login-btn:hover { background: var(--primary-dark); }
.login-btn:active { transform: translateY(1px); }

.login-msg {
  margin: 4px 0 0;
  min-height: 1.2em;
  font-size: 0.92rem;
  color: var(--muted);
}
.login-msg.error { color: var(--danger); }

.login-help {
  margin: 18px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Leaderboard */
.leaderboard-status {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.95rem;
}
.leaderboard-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
}
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 640px;
}
.leaderboard-table thead {
  background: var(--primary);
  color: white;
}
.leaderboard-table th,
.leaderboard-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.leaderboard-table th { font-weight: 700; letter-spacing: 0.02em; }
.leaderboard-table tbody tr:last-child td { border-bottom: none; }
.leaderboard-table tbody tr:nth-child(even) { background: #fafbff; }
.leaderboard-table tr.me {
  background: rgba(255, 255, 0, 0.22) !important;
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}
.leaderboard-table .col-rank { width: 56px; }
.leaderboard-table .col-class { width: 80px; color: var(--muted); }
.leaderboard-table .col-score { width: 110px; text-align: center; }
.leaderboard-table .col-total { width: 80px; text-align: right; }
.leaderboard-table .col-total strong { color: var(--primary-dark); font-size: 1.05rem; }
.leaderboard-table .muted { color: var(--muted); }
.you-tag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  background: var(--primary);
  color: white;
  font-size: 0.72rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.rank-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border);
  font-weight: 700;
  font-size: 0.9rem;
}
.rank-pill.gold {
  background: #FFD700;
  border-color: #B8860B;
  color: #5a3a00;
}
.rank-pill.silver {
  background: #C0C0C0;
  border-color: #808080;
  color: #2a2a2a;
}
.rank-pill.bronze {
  background: #CD7F32;
  border-color: #8B4513;
  color: white;
}
.rank-pill.teacher-rank {
  background: var(--primary);
  border-color: var(--primary-dark);
  color: white;
}
/* Gremlin / test account: visible on the board but never ranked. */
.leaderboard-table tbody tr.gremlin { background: #f3f0fb; }
.leaderboard-table tbody tr.gremlin td { color: var(--muted); }
.rank-pill.gremlin-rank {
  background: var(--surface);
  border-style: dashed;
  border-color: var(--border);
  color: var(--muted);
}
.ghost-tag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  background: var(--highlight);
  color: #fff;
  font-size: 0.72rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Sandbox (Pyodide placeholder layout) */
.sandbox-shell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items: stretch;
}
.sandbox-editor,
.sandbox-output {
  background: var(--code-bg);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 360px;
  box-shadow: var(--shadow-md);
}
.sandbox-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--code-text);
}
.sandbox-title {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  opacity: 0.85;
}
.sandbox-code {
  display: block;
  flex: 1;
  background: transparent;
  color: var(--code-text);
  padding: 14px 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  line-height: 1.55;
  outline: none;
  overflow: auto;
  white-space: pre;
  tab-size: 4;
  -moz-tab-size: 4;
  caret-color: var(--accent);
  min-height: 280px;
  word-break: normal;
}
.sandbox-code:focus { outline: none; }

/* Prism token colours - match the project's static code palette */
.sandbox-code .token.keyword,
.sandbox-code .token.class-name      { color: #c792ea; }
.sandbox-code .token.string,
.sandbox-code .token.attr-value      { color: #c3e88d; }
.sandbox-code .token.number,
.sandbox-code .token.boolean         { color: #f78c6c; }
.sandbox-code .token.comment         { color: #8b92b0; font-style: italic; }
.sandbox-code .token.operator,
.sandbox-code .token.punctuation     { color: #89ddff; }
.sandbox-code .token.function,
.sandbox-code .token.builtin         { color: #82aaff; }
.sandbox-code .token.decorator       { color: #ffcb6b; }
.sandbox-code .token.namespace       { opacity: 0.7; }
.sandbox-out-body {
  flex: 1;
  margin: 0;
  padding: 14px 18px;
  color: var(--code-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow: auto;
}
.sandbox-run[disabled] { opacity: 0.55; cursor: not-allowed; }
.sandbox-run.is-busy { position: relative; }

.sandbox-bar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.sandbox-bar .btn {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: 8px;
}
.sandbox-bar .btn-ghost {
  background: rgba(255, 255, 255, 0.1);
  color: var(--code-text);
  border: 1px solid rgba(255, 255, 255, 0.35);
}
.sandbox-bar .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.6);
  color: white;
}

.sandbox-out-body .out-stdout { color: var(--code-text); }
.sandbox-out-body .out-stderr { color: #ff8a8a; }
.sandbox-out-body .out-info   { color: #8b92b0; font-style: italic; }

/* Inline, terminal-style input() field and its echoed value. */
.sandbox-out-body .out-stdin { color: var(--accent); }
.sandbox-stdin {
  font: inherit;
  color: var(--accent);
  background: transparent;
  border: 0;
  outline: none;
  padding: 0;
  margin: 0;
  caret-color: transparent;   /* hidden in favour of the flashing block cursor */
  vertical-align: baseline;
}
/* Flashing block cursor shown while input() is waiting. */
.sandbox-cursor {
  display: inline-block;
  width: 0.55ch;
  height: 1.15em;
  margin-left: -2px;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: sandbox-cursor-blink 1.06s steps(1, end) infinite;
}
@keyframes sandbox-cursor-blink {
  0%, 50%      { opacity: 1; }
  50.01%, 100% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .sandbox-cursor { animation: none; }
}

/* ===== Live Coding challenges ===== */
.challenge-scoreboard { margin-bottom: 18px; }
.challenge-progress { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.challenge-progress-count { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.challenge-progress-label { color: var(--muted); font-weight: 600; }
.challenge-progress-bar {
  flex: 1; min-width: 160px; height: 10px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 999px; overflow: hidden;
}
.challenge-progress-bar > span {
  display: block; height: 100%; background: linear-gradient(90deg, var(--primary), #3a7bd5);
  transition: width 0.4s ease;
}
.challenge-progress-hint { margin: 8px 0 0; color: var(--muted); font-size: 0.9rem; }

.challenge-tab.done { color: var(--success); }
.challenge-tab.done.active { color: #fff; }
.challenge-tick { font-weight: 800; }

/* Tier indicators (Beginner / Intermediate / Stretch) on tabs and brief */
.tier-dot {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
  border: 1.5px solid rgba(0,0,0,0.18);
}
.tier-dot.tier-beginner     { background: #1f9d55; }      /* green */
.tier-dot.tier-intermediate { background: #FFB400; }      /* amber */
.tier-dot.tier-stretch      { background: #9900FF; }      /* purple */

.challenge-tier-divider {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px 4px 8px;
  margin: 0 4px 0 2px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
}
.challenge-tier-divider::before {
  content: "";
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 6px;
}
.challenge-tier-divider.tier-beginner     { color: #186a3b; }
.challenge-tier-divider.tier-beginner::before     { background: #1f9d55; }
.challenge-tier-divider.tier-intermediate { color: #8a6500; }
.challenge-tier-divider.tier-intermediate::before { background: #FFB400; }
.challenge-tier-divider.tier-stretch      { color: #6b00b3; }
.challenge-tier-divider.tier-stretch::before      { background: #9900FF; }

.challenge-tier-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: middle;
  border: 1.5px solid transparent;
}
.challenge-tier-badge.tier-beginner {
  background: #e4f6ec; color: #186a3b; border-color: #1f9d55;
}
.challenge-tier-badge.tier-intermediate {
  background: #FFF6D5; color: #8a6500; border-color: #FFB400;
}
.challenge-tier-badge.tier-stretch {
  background: #F3E6FF; color: #6b00b3; border-color: #9900FF;
}

.challenge-brief {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px; margin-bottom: 18px;
  box-shadow: var(--shadow-sm);
}
.challenge-brief-title { margin: 0 0 6px; font-size: 1.3rem; display: flex; align-items: center; gap: 10px; }
.challenge-badge-done {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--success); background: var(--success-bg); border: 1px solid var(--success);
  padding: 2px 10px; border-radius: 999px;
}
.challenge-brief-task { margin: 0 0 8px; font-weight: 700; }
.challenge-brief-detail { margin: 0 0 12px; color: var(--muted); }
.challenge-steps { margin: 8px 0 0; padding-left: 22px; }
.challenge-steps li { margin: 3px 0; }

/* Leaderboard mode toggle (Quiz / Live Coding) sits just above the class filter. */
.leaderboard-modes { margin-bottom: 12px; }
.challenge-brief code, .challenge-accept code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 1px 6px; font-size: 0.88em; color: var(--primary-dark);
}
.challenge-accept {
  margin: 0; padding: 10px 14px; background: var(--bg);
  border: 1px dashed var(--border); border-radius: var(--radius-sm); font-size: 0.92rem;
}
.challenge-accept-tag {
  font-weight: 700; color: var(--primary); margin-right: 6px;
  text-transform: uppercase; font-size: 0.72rem; letter-spacing: 0.04em;
}

.challenge-shell { margin-bottom: 18px; }
.challenge-run[disabled], .challenge-check[disabled] { opacity: 0.55; cursor: not-allowed; }

.challenge-results {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm);
}
.challenge-results-head { padding: 14px 20px; font-weight: 700; font-size: 1.05rem; }
.challenge-results-head.win  { background: var(--success-bg); color: var(--success); border-bottom: 1px solid var(--success); }
.challenge-results-head.fail { background: var(--danger-bg);  color: var(--danger);  border-bottom: 1px solid var(--danger); }
.challenge-test-list { list-style: none; margin: 0; padding: 0; }
.ct { display: flex; gap: 12px; padding: 14px 20px; border-bottom: 1px solid var(--border); }
.ct:last-child { border-bottom: none; }
.ct-icon {
  flex: none; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 800; color: #fff; font-size: 0.85rem;
}
.ct.pass .ct-icon { background: var(--success); }
.ct.fail .ct-icon { background: var(--danger); }
.ct-body { flex: 1; min-width: 0; }
.ct-label { font-weight: 700; }
.ct-why { color: var(--muted); font-size: 0.92rem; margin-top: 2px; }
.ct-output {
  margin: 8px 0 0; padding: 10px 12px; background: var(--code-bg); color: var(--code-text);
  border-radius: var(--radius-sm); font-size: 0.85rem; line-height: 1.5;
  white-space: pre-wrap; overflow-x: auto; max-height: 180px;
}

.sandbox-hint {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.sandbox-hint kbd {
  display: inline-block;
  padding: 1px 7px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  color: var(--text);
}

@media (max-width: 760px) {
  .sandbox-shell { grid-template-columns: 1fr; }
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 24px 0;
  margin-top: 40px;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}

/* Responsive */
@media (max-width: 860px) {
  .hero { padding: 44px 0 54px; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .lesson-layout { grid-template-columns: 1fr; padding: 28px 16px 48px; gap: 24px; }
  .lesson-toc { position: static; }
  .lesson { padding: 28px 22px; }
  .quiz { padding: 22px 20px; }
}

@media (max-width: 540px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .site-nav { width: 100%; justify-content: flex-start; }
  .hero-copy h1 { font-size: 1.9rem; }
  .lesson h2 { font-size: 1.25rem; }
}

/* Inline SVG arrow icon: inherits currentColor, scales with font-size. */
.arrow {
  display: inline-block;
  width: 0.95em;
  height: 0.95em;
  vertical-align: -0.13em;
  margin-left: 0.35em;
  background-color: currentColor;
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M5 12h14M13 5l7 7-7 7' stroke='black' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round' fill='none'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M5 12h14M13 5l7 7-7 7' stroke='black' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round' fill='none'/></svg>");
  -webkit-mask-repeat: no-repeat;
          mask-repeat: no-repeat;
  -webkit-mask-size: contain;
          mask-size: contain;
  -webkit-mask-position: center;
          mask-position: center;
}

/* ======================================================================
   Modules hub: featured card + smaller card variants
   ====================================================================== */
.section-title {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  margin: 48px 0 6px;
}

.module-feature {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px;
  background:
    radial-gradient(ellipse at top right, rgba(255, 255, 0, 0.25), transparent 60%),
    radial-gradient(ellipse at bottom left, rgba(28, 69, 135, 0.18), transparent 55%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 30px;
  text-decoration: none;
  color: var(--text);
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
}
.module-feature:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.module-feature-body h2 {
  font-size: 2rem;
  margin: 8px 0 12px;
  letter-spacing: -0.02em;
}

.module-feature-icon {
  height: 1.45em;
  width: auto;
  vertical-align: -0.32em;
  margin-left: 8px;
  filter: drop-shadow(0 2px 4px rgba(20, 22, 50, 0.15));
}

.module-feature-code {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: var(--radius-sm);
  padding: 22px 20px 18px;
  margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  align-self: stretch;
  white-space: pre;
  overflow-x: auto;
  position: relative;
}
.module-feature-code::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 14px;
  width: 44px;
  height: 8px;
  background:
    radial-gradient(circle at 4px 4px, #ff5f56 4px, transparent 4px),
    radial-gradient(circle at 18px 4px, #ffbd2e 4px, transparent 4px),
    radial-gradient(circle at 32px 4px, #27c93f 4px, transparent 4px);
}

.card-grid-small {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 18px;
}
.card-small { padding: 18px; }
.card-icon-small {
  width: 36px;
  height: 36px;
  font-size: 1rem;
  border-radius: 9px;
}

/* ======================================================================
   Freeplay: toolbar, question card, options, feedback
   ====================================================================== */
.freeplay { padding-top: 32px; padding-bottom: 60px; }

.freeplay-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.freeplay-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
}

.fp-tab {
  border: none;
  background: transparent;
  font-family: inherit;
  color: var(--muted);
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.12s, color 0.12s;
}
.fp-tab:hover { color: var(--text); }
.fp-tab.active { background: var(--primary); color: white; }

.freeplay-stats {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.fp-chip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  font-weight: 700;
  font-size: 0.9rem;
}
.fp-chip.fp-streak { background: rgba(255, 255, 0, 0.18); border-color: var(--accent); }
.fp-chip.fp-streak.hot { background: var(--accent); }

.fp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow-md);
  position: relative;
}
.fp-card.answered-correct { border-color: var(--success); }
.fp-card.answered-wrong   { border-color: var(--danger); }

/* Cooldown bar that fills along the top of the card while answers are
   locked, so kids can't speed-cheese by hammering buttons. */
.fp-cooldown-bar {
  position: absolute;
  top: 0; left: 0;
  height: 4px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #FFCB00);
  border-top-left-radius: var(--radius);
  border-top-right-radius: var(--radius);
  pointer-events: none;
}
.fp-card.cooling .fp-option {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.fp-card-head {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.fp-tag {
  display: inline-block;
  background: rgba(28, 69, 135, 0.1);
  color: var(--primary);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.fp-tag[data-topic="html"]    { background: rgba(255, 122, 89, 0.15); color: #b3441f; }
.fp-tag[data-topic="logic"]   { background: rgba(124, 92, 255, 0.15); color: #5436c1; }
.fp-tag[data-topic="concept"] { background: rgba(46, 196, 182, 0.18); color: #146d65; }
.fp-tag.fp-diff               { background: rgba(0, 0, 0, 0.06); color: var(--muted); }
.fp-tag.fp-diff[data-diff="medium"] { background: rgba(255, 190, 11, 0.2); color: #8a5a00; }
.fp-tag.fp-diff[data-diff="hard"]   { background: rgba(210, 60, 60, 0.15); color: #a32424; }

.fp-card-id {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.fp-prompt {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 14px;
  line-height: 1.4;
}

.fp-code {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: var(--radius-sm);
  padding: 18px 18px;
  margin: 0 0 18px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  line-height: 1.55;
  white-space: pre;
  overflow-x: auto;
}
.fp-code code {
  background: transparent;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  white-space: pre;
}

/* Prism token colours, tuned for the Hallam navy code background. */
.fp-code .token.comment,
.fp-code .token.prolog,
.fp-code .token.doctype,
.fp-code .token.cdata        { color: #8a93b3; font-style: italic; }
.fp-code .token.punctuation  { color: #c9d1e7; }
.fp-code .token.keyword,
.fp-code .token.boolean,
.fp-code .token.constant,
.fp-code .token.operator,
.fp-code .token.symbol       { color: #FFFA45; }
.fp-code .token.string,
.fp-code .token.char,
.fp-code .token.attr-value,
.fp-code .token.regex        { color: #9be59b; }
.fp-code .token.number       { color: #ffb070; }
.fp-code .token.function,
.fp-code .token.builtin,
.fp-code .token.class-name   { color: #82c8ff; }
.fp-code .token.tag,
.fp-code .token.attr-name    { color: #82c8ff; }
.fp-code .token.selector,
.fp-code .token.important    { color: #ff8fb3; }
.fp-code .token.entity,
.fp-code .token.url          { color: #ffb070; }

.fp-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.fp-option {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s, transform 0.08s;
}
.fp-option:hover:not(:disabled) {
  border-color: var(--primary);
  background: rgba(28, 69, 135, 0.05);
}
.fp-option:active { transform: translateY(1px); }
.fp-option:disabled { cursor: default; }

.fp-option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 0.95rem;
  flex-shrink: 0;
}
.fp-option-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95rem;
  word-break: break-word;
}

.fp-option.is-correct {
  background: var(--success-bg);
  border-color: var(--success);
}
.fp-option.is-correct .fp-option-letter {
  background: var(--success);
  color: white;
  border-color: var(--success);
}
.fp-option.is-wrong {
  background: var(--danger-bg);
  border-color: var(--danger);
}
.fp-option.is-wrong .fp-option-letter {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}
.fp-option.is-chosen { font-weight: 700; }

.fp-feedback {
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 16px;
  font-size: 0.98rem;
  line-height: 1.5;
}
.fp-feedback.correct { background: var(--success-bg); color: #0d6b3a; border: 1px solid var(--success); }
.fp-feedback.wrong   { background: var(--danger-bg);  color: #8a1a1a; border: 1px solid var(--danger); }
.fp-feedback em { font-style: normal; font-weight: 700; }

.fp-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.fp-foot { margin-top: 22px; }

/* ======================================================================
   Responsive: modules + freeplay
   ====================================================================== */
@media (max-width: 860px) {
  .module-feature { grid-template-columns: 1fr; padding: 26px 22px; }
  .module-feature-body h2 { font-size: 1.6rem; }
  .module-feature-code { font-size: 0.85rem; padding-top: 26px; }
  .fp-options { grid-template-columns: 1fr; }
  .freeplay-toolbar { flex-direction: column; align-items: stretch; }
  .freeplay-stats { justify-content: flex-start; }
}

@media (max-width: 540px) {
  .fp-card { padding: 22px 18px; }
  .fp-prompt { font-size: 1.05rem; }
  .fp-code { font-size: 0.85rem; padding: 14px 14px; }
  .fp-tab { padding: 7px 10px; font-size: 0.85rem; }
}