/* =============================================================
   Advaslearning Hub — styles.css
   Shared stylesheet for: home, python, scratch (soon), webapp (soon)
   Modern + youngster style
   -------------------------------------------------------------
   Edit colours / spacing / fonts in the :root block below.
   Everything else cascades from there.
   ============================================================= */

/* ---------- 1. Design tokens (edit these freely) ---------- */
:root {

  /* Brand */
  --brand:           #6366F1;   /* indigo */
  --brand-deep:      #4F46E5;
  --brand-soft:      #EEF0FF;

  /* Per-level accents */
  --l1: #10B981;   /* mint green       */
  --l2: #3B82F6;   /* ocean blue       */
  --l3: #F59E0B;   /* sunset orange    */
  --l4: #EC4899;   /* magenta pink     */
  --l5: #8B5CF6;   /* violet — AI/next */
  --l6: #0D9488;   /* teal — testing   */
  --l7: #65A30D;   /* lime — automation*/
  --l8: #DC2626;   /* deep red — security */

  /* Optional modules — game-themed, outside the cert path */
  --pz: #FB7185;   /* soft coral — Pygame Zero */
  --pg: #E11D48;   /* deep rose — Pygame */

  --l1-soft: #E7FBF3;
  --l2-soft: #E8F1FE;
  --l3-soft: #FEF4E0;
  --l4-soft: #FDE8F1;
  --l5-soft: #F1ECFE;
  --l6-soft: #E2F5F2;
  --l7-soft: #ECF7DA;
  --l8-soft: #FEE6E6;
  --pz-soft: #FFE4E8;
  --pg-soft: #FFE4EA;

  /* Exam-prep accent (consistent across all levels with exam-prep lessons) */
  --exam-1:      #6366F1;   /* indigo (matches brand) */
  --exam-2:      #4F46E5;
  --exam-soft:   #EEF0FF;
  --exam-border: #C7D0FF;

  /* Neutrals */
  --bg:        #F7F8FC;
  --surface:   #FFFFFF;
  --ink:       #0F172A;
  --ink-soft:  #334155;
  --muted:     #64748B;
  --border:    #E2E8F0;

  /* Lesson-type accents (consistent across all 4 levels) */
  --game-1:      #FBBF24;   /* amber  */
  --game-2:      #F59E0B;
  --game-soft:   #FFFBEB;
  --game-border: #FCD34D;

  --challenge-1:      #F43F5E;   /* rose */
  --challenge-2:      #EC4899;
  --challenge-soft:   #FEF2F2;
  --challenge-border: #FCA5A5;

  /* Code */
  --code-bg:   #0F172A;
  --code-ink:  #E2E8F0;

  /* Type */
  --font-ui:   "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI",
               Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
               Consolas, monospace;

  /* Sizing */
  --radius-sm: 10px;
  --radius:    16px;
  --radius-lg: 24px;
  --shadow:    0 4px 20px -8px rgba(15, 23, 42, 0.12),
               0 2px 6px  -2px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 20px 50px -20px rgba(99, 102, 241, 0.35);

  --maxw: 1200px;
}

/* ---------- 2. Base reset ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0; line-height: 1.2; letter-spacing: -0.01em; }
p           { margin: 0; color: var(--ink-soft); }
ol, ul      { margin: 0; padding: 0; list-style: none; }
a           { color: var(--brand); text-decoration: none; }
a:hover     { text-decoration: underline; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--brand-soft);
  color: var(--brand-deep);
  padding: 2px 6px;
  border-radius: 6px;
}

/* ---------- 3. Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1200px 400px at 80% -100px, rgba(99,102,241,0.18), transparent 60%),
    radial-gradient(900px 380px at 0% 100%,  rgba(236, 72, 153, 0.14), transparent 60%),
    linear-gradient(180deg, #FFFFFF 0%, #F4F6FF 100%);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 72px 24px 56px;
  text-align: center;
}

.badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-deep);
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
}
.hero-accent { color: var(--brand); }
.hero-sub-line {
  display: block;
  background: linear-gradient(90deg,
              var(--l1) 0%,
              var(--l2) 14%,
              var(--l3) 28%,
              var(--l4) 42%,
              var(--l5) 56%,
              var(--l6) 70%,
              var(--l7) 84%,
              var(--l8) 100%);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  font-size: 0.7em;
  font-weight: 700;
  margin-top: 4px;
}

.hero-tagline {
  max-width: 640px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
  color: var(--ink-soft);
}
.hero-tagline code {
  background: white;
  border: 1px solid var(--border);
}

/* Stats row */
.stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 0 auto 28px;
}
.stats li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 22px;
  min-width: 110px;
  box-shadow: var(--shadow);
}
.stat-num {
  display: block;
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--brand-deep);
  letter-spacing: -0.02em;
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

/* Hero quick-jump chips */
.hero-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.chip {
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--ink);
  transition: transform .15s ease, box-shadow .15s ease;
  text-decoration: none;
}
.chip:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  text-decoration: none;
}
.chip--l1 { border-color: var(--l1); color: var(--l1); }
.chip--l2 { border-color: var(--l2); color: var(--l2); }
.chip--l3 { border-color: var(--l3); color: var(--l3); }
.chip--l4 { border-color: var(--l4); color: var(--l4); }
.chip--l5 { border-color: var(--l5); color: var(--l5); }
.chip--l6 { border-color: var(--l6); color: var(--l6); }
.chip--l7 { border-color: var(--l7); color: var(--l7); }
.chip--l8 { border-color: var(--l8); color: var(--l8); }
.chip--pz { border-color: var(--pz); color: var(--pz); }
.chip--pg { border-color: var(--pg); color: var(--pg); }

/* Cert pill row in the hero */
.cert-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 18px 0 4px;
}
.cert-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: #fff;
  padding: 6px 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  box-shadow: 0 2px 8px -2px rgba(99,102,241,0.4);
}

/* Hero legend */
.legend {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 28px 0 0;
  font-size: 0.86rem;
  color: var(--muted);
  font-weight: 500;
}
.legend-item { display: inline-flex; align-items: center; gap: 8px; }
.legend-dot {
  width: 11px; height: 11px;
  border-radius: 999px;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(255,255,255,0.85), 0 1px 4px rgba(15,23,42,0.15);
}
.legend-dot--game      { background: linear-gradient(135deg, var(--game-1) 0%, var(--game-2) 100%); }
.legend-dot--challenge { background: linear-gradient(135deg, var(--challenge-1) 0%, var(--challenge-2) 100%); }
.legend-dot--project   { background: linear-gradient(135deg, var(--brand) 0%, var(--l4) 100%); }
.legend-dot--exam      { background: linear-gradient(135deg, var(--exam-1) 0%, var(--exam-2) 100%); }

/* ---------- 4. Container + level sections ---------- */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.level {
  margin-bottom: 72px;
  scroll-margin-top: 24px;
}
.level:last-child { margin-bottom: 0; }

.level-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 28px;
  border-radius: var(--radius-lg);
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}

.level-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  opacity: 1;
  z-index: 0;
}
.level-header > * { position: relative; z-index: 1; }

.level-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.25);
  color: #fff;
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 10px;
  backdrop-filter: blur(4px);
}

.level-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: #fff;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.level-header p {
  color: rgba(255,255,255,0.92);
  margin-top: 6px;
  max-width: 640px;
}

.level-header-right {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.meta {
  background: rgba(255,255,255,0.2);
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
}

/* ---- Required-materials block (collapsible, open by default) ---- */
.level-materials {
  margin: 0 0 24px;
  background: #fff;
  border: 1px solid var(--border, #E2E8F0);
  border-left: 6px solid var(--accent, var(--brand));
  border-radius: 12px;
  box-shadow: 0 2px 10px -6px rgba(15, 23, 42, 0.18);
  overflow: hidden;
}
.level-materials > summary {
  list-style: none;            /* hide default disclosure arrow */
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--accent-soft, var(--brand-soft, #F1F5F9));
  color: var(--accent-dark, var(--brand-deep, #0F172A));
  font-weight: 700;
  user-select: none;
  position: relative;
}
.level-materials > summary::-webkit-details-marker { display: none; }
.level-materials > summary::after {
  content: "▾";                /* down arrow when open */
  margin-left: auto;
  font-size: 0.9rem;
  transition: transform .15s ease;
}
.level-materials:not([open]) > summary::after { content: "▸"; }
.level-materials > summary:hover {
  background: color-mix(in srgb, var(--accent, var(--brand)) 18%, white);
}
.level-materials__icon {
  font-size: 1.2rem;
  line-height: 1;
}
.level-materials__title {
  font-size: 1rem;
  letter-spacing: 0.01em;
}
.level-materials__hint {
  font-size: 0.78rem;
  font-weight: 500;
  color: color-mix(in srgb, var(--accent-dark, var(--brand-deep, #0F172A)) 70%, transparent);
  font-style: italic;
  margin-left: auto;
}
.level-materials > summary::after { margin-left: 4px; }
.level-materials__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px 24px;
  padding: 18px 20px 20px;
  background: #fff;
}
.level-materials__group {
  min-width: 0;
}
.level-materials__heading {
  margin: 0 0 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark, var(--brand-deep, #0F172A));
  border-bottom: 1px dashed var(--border, #E2E8F0);
  padding-bottom: 4px;
}
.level-materials__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.level-materials__item {
  display: grid;
  grid-template-columns: 100px 1fr;
  column-gap: 14px;
  align-items: center;
  padding: 10px 0;
  font-size: 0.9rem;
  line-height: 1.45;
  color: #1E293B;
  border-bottom: 1px dotted #F1F5F9;
}
.level-materials__item:last-child { border-bottom: none; }
.level-materials__emoji {
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.6rem;
  line-height: 1;
  text-align: center;
  user-select: none;
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 8px;
}
.level-materials__thumb {
  width: 100px;
  height: 100px;
  object-fit: contain;
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  border-radius: 8px;
  display: block;
  padding: 4px;
  box-sizing: border-box;
}
.level-materials__name { font-weight: 600; }
.level-materials__qty {
  display: inline-block;
  margin-left: 6px;
  color: var(--accent-dark, var(--brand-deep, #0F172A));
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.82rem;
  font-weight: 700;
}
.level-materials__note {
  color: #64748B;
  font-size: 0.86rem;
}
@media (max-width: 640px) {
  .level-materials__body {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 14px 16px 16px;
  }
  .level-materials > summary { padding: 12px 14px; }
  .level-materials__hint { display: none; }   /* save space on phones */
}

/* Per-level accent variables (consumed by ::before above) */
.level--1 { --accent: var(--l1); --accent-dark: #059669; --accent-soft: var(--l1-soft); }
.level--2 { --accent: var(--l2); --accent-dark: #1D4ED8; --accent-soft: var(--l2-soft); }
.level--3 { --accent: var(--l3); --accent-dark: #D97706; --accent-soft: var(--l3-soft); }
.level--4 { --accent: var(--l4); --accent-dark: #BE185D; --accent-soft: var(--l4-soft); }
.level--5 { --accent: var(--l5); --accent-dark: #6D28D9; --accent-soft: var(--l5-soft); }
.level--6 { --accent: var(--l6); --accent-dark: #0F766E; --accent-soft: var(--l6-soft); }
.level--7 { --accent: var(--l7); --accent-dark: #4D7C0F; --accent-soft: var(--l7-soft); }
.level--8 { --accent: var(--l8); --accent-dark: #991B1B; --accent-soft: var(--l8-soft); }
.level--pz { --accent: var(--pz); --accent-dark: #BE123C; --accent-soft: var(--pz-soft); }
.level--pg { --accent: var(--pg); --accent-dark: #9F1239; --accent-soft: var(--pg-soft); }

.optional-banner {
  margin: 4rem auto 1.5rem;
  padding: 2rem 1.75rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--pz-soft) 0%, var(--pg-soft) 100%);
  border: 1px solid var(--pz);
  text-align: center;
}
.optional-banner h2 {
  margin: 0 0 0.5rem;
  font-size: 1.6rem;
  color: var(--pg);
}
.optional-banner p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 60ch;
  margin-inline: auto;
  line-height: 1.6;
}

/* Contact page — single centered card sitting BELOW the shared topnav. */
.contact-page { display: block; }
.contact-page .container { padding-top: 24px; padding-bottom: 64px; }
.contact-card {
  max-width: 560px;
  margin: 32px auto;
  padding: 36px 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow);
}
.contact-card__eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
}
.contact-card__title { margin: 0 0 14px; font-size: 2rem; font-weight: 800; }
.contact-card__lead { font-size: 1.05rem; color: var(--ink); margin: 0 0 14px; }
.contact-card__email {
  display: inline-block;
  font-weight: 700;
  color: var(--brand);
  text-decoration: none;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--brand-soft);
}
.contact-card__email:hover { text-decoration: underline; }
.contact-card__hint { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* Placeholder block under an Optional Module level header when no lessons
   are listed yet (the structure is still being designed). */
.optional-empty {
  margin: 12px 0 0;
  padding: 22px;
  text-align: center;
  color: var(--muted);
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  font-style: italic;
}

.prereq {
  margin-top: 1rem;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  border: 1px solid var(--accent);
}
.prereq > summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent-dark);
  user-select: none;
}
.prereq > summary:hover { color: var(--accent); }
.prereq[open] > summary { margin-bottom: 0.625rem; }
.prereq ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--ink-soft);
  line-height: 1.7;
}
.prereq li + li { margin-top: 0.375rem; }
.prereq code {
  background: rgba(15, 23, 42, 0.06);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Cert badge in level header (right side) */
.cert-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(255,255,255,0.22);
  padding: 6px 12px;
  border-radius: 999px;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.3);
}
.cert-badge--complete {
  background: rgba(255,255,255,0.95);
  color: var(--accent-dark);
  border-color: transparent;
}

/* ---------- 5. Lesson cards grid ---------- */
.lessons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.lesson-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.lesson-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--accent);
  transform: scaleY(0.6);
  transform-origin: top;
  transition: transform .25s ease;
}

.lesson-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 14px 40px -22px rgba(15,23,42,0.25);
}
.lesson-card:hover::before { transform: scaleY(1); }

.lesson-card .num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 999px;
  align-self: flex-start;
  letter-spacing: 0.04em;
}

.lesson-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.lesson-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
}
.lesson-card code {
  font-size: 0.82em;
  background: #F1F5F9;
  color: var(--ink);
  border-radius: 5px;
}

/* Project / Capstone variants */
.lesson-card--project {
  background: linear-gradient(180deg, var(--accent-soft) 0%, var(--surface) 60%);
  border-color: var(--accent);
}
.lesson-card--project::before { transform: scaleY(1); width: 5px; }

.ribbon {
  position: absolute;
  top: 14px;
  right: 14px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--accent);
  color: #fff;
  padding: 4px 10px;
  border-radius: 999px;
}

.lesson-card--capstone {
  background: linear-gradient(135deg, #FFF7FA 0%, #FFE6F1 100%);
  border-color: var(--l4);
  box-shadow: var(--shadow-lg);
}
.ribbon--capstone {
  background: linear-gradient(90deg, var(--l4) 0%, var(--brand) 100%);
}

/* Game variant — amber accent, consistent across all levels */
.lesson-card--game {
  background: linear-gradient(180deg, var(--game-soft) 0%, var(--surface) 65%);
  border-color: var(--game-border);
}
.lesson-card--game::before {
  background: linear-gradient(180deg, var(--game-1) 0%, var(--game-2) 100%);
  transform: scaleY(1);
  width: 5px;
}
.lesson-card--game:hover { border-color: var(--game-2); }

.ribbon--game {
  background: linear-gradient(135deg, var(--game-1) 0%, var(--game-2) 100%);
}

/* Challenge variant — rose accent, consistent across all levels */
.lesson-card--challenge {
  background: linear-gradient(180deg, var(--challenge-soft) 0%, var(--surface) 65%);
  border-color: var(--challenge-border);
}
.lesson-card--challenge::before {
  background: linear-gradient(180deg, var(--challenge-1) 0%, var(--challenge-2) 100%);
  transform: scaleY(1);
  width: 5px;
}
.lesson-card--challenge:hover { border-color: var(--challenge-2); }

.ribbon--challenge {
  background: linear-gradient(135deg, var(--challenge-1) 0%, var(--challenge-2) 100%);
}

/* Arc variant — mint/emerald, signals "one step of a multi-lesson Project Arc" */
.ribbon--arc {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: none;
}

/* Exam-prep variant — indigo, signals "the cert lesson" */
.lesson-card--exam {
  background:
    linear-gradient(180deg, var(--exam-soft) 0%, var(--surface) 65%),
    repeating-linear-gradient(135deg,
      transparent 0,
      transparent 14px,
      rgba(99,102,241,0.04) 14px,
      rgba(99,102,241,0.04) 16px);
  border-color: var(--exam-border);
}
.lesson-card--exam::before {
  background: linear-gradient(180deg, var(--exam-1) 0%, var(--exam-2) 100%);
  transform: scaleY(1);
  width: 5px;
}
.lesson-card--exam:hover { border-color: var(--exam-2); }

.ribbon--exam {
  background: linear-gradient(135deg, var(--exam-1) 0%, var(--exam-2) 100%);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* Coming-soon variant — dimmed, non-clickable when href is omitted */
.lesson-card--coming-soon {
  background: #F8FAFC;
  border-style: dashed;
  border-color: #CBD5E1;
  color: #94A3B8;
  cursor: default;
  box-shadow: none;
}
.lesson-card--coming-soon:hover {
  border-color: #CBD5E1;
  transform: none;
  box-shadow: none;
}
.lesson-card--coming-soon::before { display: none; }
.lesson-card--coming-soon .num { color: #94A3B8; background: #F1F5F9; }
.lesson-card--coming-soon h3   { color: #94A3B8; }
.lesson-card--coming-soon p    { color: #B0BEC5; }
.ribbon--coming-soon {
  background: #E2E8F0;
  color: #475569;
  font-weight: 600;
}

/* ---------- 6. Footer ---------- */
.site-footer {
  text-align: center;
  padding: 36px 24px 56px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.site-footer p { font-size: 0.95rem; }
.site-footer .muted { color: var(--muted); font-size: 0.85rem; margin-top: 4px; }

/* ---------- 7. Responsive ---------- */
@media (max-width: 720px) {
  .hero-inner    { padding: 56px 20px 44px; }
  .container     { padding: 40px 16px 56px; }
  .level         { margin-bottom: 56px; }
  .level-header  { padding: 22px 20px; flex-direction: column; align-items: flex-start; }
  .stats li      { padding: 12px 16px; min-width: 90px; }
  .stat-num      { font-size: 1.4rem; }
  .lessons       { grid-template-columns: 1fr; }
}

/* ---------- 8. Print (optional, useful for teachers) ---------- */
@media print {
  body { background: #fff; }
  .hero, .hero-nav, .site-footer { background: #fff !important; }
  .lesson-card { break-inside: avoid; box-shadow: none; }
  .level-header::before { background: #eee !important; }
  .level-header h2, .level-header p, .level-tag, .meta { color: #000 !important; }
}

/* =============================================================
   9. Top nav (used on every page)
   ============================================================= */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  font-size: 0.95rem;
}
.topnav-brand {
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.05rem;
}
.topnav-brand:hover { color: var(--brand); text-decoration: none; }
.topnav-back {
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 999px;
  transition: background .15s ease, color .15s ease;
}
.topnav-back:hover {
  color: var(--brand);
  background: var(--brand-soft);
  text-decoration: none;
}

/* Right-hand group: holds back link + dashboard CTA on lesson pages */
.topnav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Shared right-hand nav: Courses (dropdown) · Contact · Dashboard or Login.
   Used by every public page. */
.topnav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.topnav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--muted);
  background: transparent;
  border: 0;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.topnav-link:hover {
  color: var(--brand);
  background: var(--brand-soft);
  text-decoration: none;
}
.topnav-link--cta {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep, #4F46E5) 100%);
  color: #fff;
  margin-left: 6px;
}
.topnav-link--cta:hover {
  color: #fff;
  filter: brightness(1.07);
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep, #4F46E5) 100%);
}

/* Courses dropdown */
.topnav-dropdown {
  position: relative;
  display: inline-block;
}
.topnav-link--menu .topnav-link__chev {
  display: inline-block;
  font-size: 0.72em;
  transition: transform .15s ease;
}
.topnav-link--menu.is-open .topnav-link__chev { transform: rotate(180deg); }

.topnav-dropdown__menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 80;
  display: grid;
  gap: 2px;
  min-width: 280px;
  padding: 6px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.18);
}
.topnav-dropdown__item {
  display: grid;
  gap: 2px;
  padding: 10px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--ink);
}
.topnav-dropdown__item:hover {
  background: var(--brand-soft);
  color: var(--brand);
  text-decoration: none;
}
.topnav-dropdown__name {
  font-weight: 700;
  font-size: 0.95rem;
}
.topnav-dropdown__tag {
  font-size: 0.78rem;
  color: var(--muted);
}
.topnav-dropdown__item:hover .topnav-dropdown__tag { color: var(--brand); }

@media (max-width: 540px) {
  .topnav-link { padding: 6px 10px; font-size: 0.9rem; }
  .topnav-dropdown__menu { min-width: 240px; right: -6px; }
}

/* Primary CTA in the top nav (Login / Dashboard) */
.topnav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.92rem;
  color: #fff;
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  box-shadow: 0 4px 14px -6px rgba(99, 102, 241, 0.45);
  transition: transform .15s ease, box-shadow .15s ease, filter .15s ease;
}
.topnav-cta:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
  box-shadow: 0 8px 20px -8px rgba(99, 102, 241, 0.55);
  text-decoration: none;
  color: #fff;
}
.topnav-cta:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
}

/* =============================================================
  10. Home page — hero variant + course cards
   ============================================================= */
.hero--home .hero-inner { padding: 40px 24px 56px; }

.courses {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 72px;
}

.course-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 28px 26px 26px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.course-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--course-accent, var(--brand));
  transform: scaleX(0.4);
  transform-origin: left;
  transition: transform .25s ease;
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 50px -28px rgba(15,23,42,0.25);
  border-color: var(--course-accent, var(--brand));
  text-decoration: none;
}
.course-card:hover::before { transform: scaleX(1); }

.course-card--scratch { --course-accent: #F59E0B; }
.course-card--python  { --course-accent: #3776AB; }
.course-card--webapp  { --course-accent: #06B6D4; }
.course-card--arduino { --course-accent: #00979D; }
.course-card--ev3     { --course-accent: #E11D48; }
.course-card--advasbot{ --course-accent: #0EA5E9; }
.course-card--microbit{ --course-accent: #7C3AED; }
.course-card--ai      { --course-accent: #8B5CF6; }
.course-card--gcse    { --course-accent: #6366F1; }
.course-card--igcse   { --course-accent: #0891B2; }
.course-card--godot   { --course-accent: #478CBF; }

.course-card-icon {
  display: inline-flex;
  width: 72px; height: 72px;
  border-radius: 18px;
  background: linear-gradient(135deg,
              color-mix(in srgb, var(--course-accent) 14%, white) 0%,
              color-mix(in srgb, var(--course-accent) 4%, white) 100%);
  align-items: center;
  justify-content: center;
}
.course-card-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
}
.course-card-body h2 {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 6px 0 10px;
}
.course-card-body p {
  font-size: 0.96rem;
  color: var(--ink-soft);
}

.course-card-stats {
  display: flex;
  gap: 16px;
  margin: 16px 0 0;
  list-style: none;
  padding: 0;
  flex-wrap: wrap;
}
.course-card-stats li {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 500;
}
.course-card-stats li strong {
  color: var(--ink);
  font-weight: 700;
  font-size: 1.1rem;
}

.course-card-certs {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--course-accent);
  margin-top: 8px;
  font-weight: 600;
}

.course-card-cta {
  display: inline-flex;
  align-items: center;
  margin-top: 12px;
  font-weight: 700;
  font-size: 0.96rem;
  letter-spacing: -0.005em;
}
.course-card-cta--live { color: var(--course-accent); }
.course-card-cta--soon { color: var(--muted); }

.course-card-corner {
  position: absolute;
  top: 18px; right: 18px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 5px 10px;
  border-radius: 999px;
}
.course-card-corner--soon {
  background: #F1F5F9;
  color: var(--muted);
}
.course-card-corner--live {
  background: linear-gradient(135deg, var(--course-accent), color-mix(in srgb, var(--course-accent) 70%, black));
  color: #fff;
  box-shadow: 0 4px 14px -4px color-mix(in srgb, var(--course-accent) 60%, transparent);
}

.course-card--live {
  background: linear-gradient(180deg,
              color-mix(in srgb, var(--course-accent) 6%, white) 0%,
              var(--surface) 60%);
  border-color: color-mix(in srgb, var(--course-accent) 40%, var(--border));
}
.course-card--live::before { transform: scaleX(1); height: 5px; }

/* "How our courses work" trio */
.home-info {
  margin-bottom: 40px;
  text-align: center;
}
.home-info h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  text-align: left;
}
.info-item {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.info-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.info-item h4 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.info-item p {
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.5;
}

/* =============================================================
  11. Coming-soon pages (scratch.html, webapp.html)
   ============================================================= */
.soon {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(900px 380px at 100% -100px, rgba(99,102,241,0.10), transparent 60%),
    radial-gradient(800px 400px at 0% 100%,   rgba(236,72,153,0.08),  transparent 60%),
    var(--bg);
}

.soon--scratch { --soon-accent: #F59E0B; --soon-accent-dark: #D97706; }
.soon--webapp  { --soon-accent: #06B6D4; --soon-accent-dark: #0891B2; }

.soon-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px 60px;
}
.soon-card {
  max-width: 640px;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 44px 40px 36px;
  box-shadow: 0 30px 70px -40px rgba(15,23,42,0.25);
  position: relative;
  overflow: hidden;
}
.soon-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(90deg, var(--soon-accent) 0%, var(--soon-accent-dark) 100%);
}

.soon-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--soon-accent-dark);
  background: color-mix(in srgb, var(--soon-accent) 15%, white);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.soon-card h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.soon-lead {
  font-size: 1.06rem;
  color: var(--ink-soft);
  margin-bottom: 28px;
}

.soon-preview h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.005em;
}
.soon-list {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}
.soon-list li {
  position: relative;
  padding: 6px 0 6px 26px;
  color: var(--ink-soft);
  font-size: 0.96rem;
}
.soon-list li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 6px;
  width: 18px; height: 18px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--soon-accent) 15%, white);
  color: var(--soon-accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.soon-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.soon-pill {
  background: #F1F5F9;
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 999px;
}

.soon-cta {
  display: inline-block;
  font-weight: 700;
  color: var(--brand);
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--brand-soft);
  transition: background .15s ease;
}
.soon-cta:hover {
  background: color-mix(in srgb, var(--brand) 12%, white);
  text-decoration: none;
}

/* =============================================================
  12. Mobile tweaks for new components
   ============================================================= */
@media (max-width: 720px) {
  .topnav      { padding: 14px 16px; }
  .courses     { grid-template-columns: 1fr; gap: 18px; }
  .course-card { padding: 24px 20px 22px; }
  .soon-card   { padding: 32px 22px 26px; }
}

/* Python lesson-page CSS lives in Python/python_styles.css.
   Loaded by python.html and every Python/level-<N>/L<N>-<NN>-*.html. */

/* =============================================================
   13. Loading state (used by app/loading.tsx + nested loading.tsx)
   ============================================================= */
.page-loading {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(2px);
  z-index: 9990;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}
.page-loading__spinner {
  width: 38px;
  height: 38px;
  border: 3px solid var(--brand-soft);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: page-spin 0.8s linear infinite;
}
@keyframes page-spin {
  to { transform: rotate(360deg); }
}

/* Top route-transition bar — animated by <NavProgress> in app/layout.tsx */
.nav-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--brand) 0%, var(--brand-deep) 100%);
  z-index: 9999;
  transition: width 0.25s ease, opacity 0.35s ease 0.25s;
  opacity: 0;
  pointer-events: none;
}
.nav-progress--active {
  width: 100%;
  opacity: 1;
  transition: width 0.55s cubic-bezier(0.2, 0.8, 0.4, 1);
}

/* =============================================================
   12. Course-landing page extras (Arduino, Scratch)
   Lifted from the per-page inline <style> blocks so the new
   Next.js course pages (app/arduino, app/scratch) pick them up.
   ============================================================= */

/* Hero variants */
.hero--arduino {
  background:
    radial-gradient(circle at 20% 0%, rgba(0,151,157,0.18), transparent 55%),
    radial-gradient(circle at 80% 100%, rgba(0,151,157,0.10), transparent 55%),
    #FAFCFD;
  border-bottom: 1px solid #DCE9EB;
}
.badge--arduino { background: #00979D; color: #fff; }
.hero--arduino .hero-accent { color: #00979D; }

.hero--scratch {
  background:
    radial-gradient(circle at 20% 0%, rgba(244,162,26,0.20), transparent 55%),
    radial-gradient(circle at 80% 100%, rgba(244,162,26,0.12), transparent 55%),
    #FFFCF6;
  border-bottom: 1px solid #F2E6CC;
}
.badge--scratch { background: #F4A21A; color: #fff; }
.hero--scratch .hero-accent { color: #F4A21A; }

.hero--ev3 {
  background:
    radial-gradient(circle at 20% 0%, rgba(225,29,72,0.18), transparent 55%),
    radial-gradient(circle at 80% 100%, rgba(225,29,72,0.10), transparent 55%),
    #FFF7F8;
  border-bottom: 1px solid #FBD3DC;
}
.badge--ev3 { background: #E11D48; color: #fff; }
.hero--ev3 .hero-accent { color: #E11D48; }

.hero--advasbot {
  background:
    radial-gradient(circle at 20% 0%, rgba(14,165,233,0.18), transparent 55%),
    radial-gradient(circle at 80% 100%, rgba(14,165,233,0.10), transparent 55%),
    #F2FBFF;
  border-bottom: 1px solid #CDEEFB;
}
.badge--advasbot { background: #0EA5E9; color: #fff; }
.hero--advasbot .hero-accent { color: #0EA5E9; }

.hero--microbit {
  background:
    radial-gradient(circle at 20% 0%, rgba(124,58,237,0.18), transparent 55%),
    radial-gradient(circle at 80% 100%, rgba(124,58,237,0.10), transparent 55%),
    #F6F2FE;
  border-bottom: 1px solid #E0D4FB;
}
.badge--microbit { background: #7C3AED; color: #fff; }
.hero--microbit .hero-accent { color: #7C3AED; }
.microbit-stats {
  display: flex; flex-wrap: wrap; gap: 14px; margin-top: 22px; justify-content: center;
}
.microbit-stats .stat {
  background: #fff; border: 1px solid #E0D4FB; border-radius: 12px; padding: 10px 18px;
  font-weight: 600; color: #0F172A; box-shadow: 0 6px 18px -14px rgba(124,58,237,0.4);
}
.microbit-stats .stat strong { color: #7C3AED; }
.hero--microbit ~ main .level-nav a:hover { border-color: #7C3AED; }

.hero--gcse {
  background:
    radial-gradient(circle at 20% 0%, rgba(99,102,241,0.18), transparent 55%),
    radial-gradient(circle at 80% 100%, rgba(99,102,241,0.10), transparent 55%),
    #F6F7FE;
  border-bottom: 1px solid #DADCFB;
}
.badge--gcse { background: #6366F1; color: #fff; }
.hero--gcse .hero-accent { color: #6366F1; }
.gcse-stats {
  display: flex; flex-wrap: wrap; gap: 14px; margin-top: 22px; justify-content: center;
}
.gcse-stats .stat {
  background: #fff; border: 1px solid #DADCFB; border-radius: 12px; padding: 10px 18px;
  font-weight: 600; color: #0F172A; box-shadow: 0 6px 18px -14px rgba(99,102,241,0.4);
}
.gcse-stats .stat strong { color: #6366F1; }
.hero--gcse ~ main .level-nav a:hover { border-color: #6366F1; }

/* Stat rows under course-page heros */
.arduino-stats, .scratch-stats, .ev3-stats, .advasbot-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
  justify-content: center;
}
.arduino-stats .stat,
.scratch-stats .stat,
.ev3-stats .stat,
.advasbot-stats .stat {
  background: #fff;
  border: 1px solid #DCE9EB;
  border-radius: 12px;
  padding: 10px 18px;
  font-weight: 600;
  color: #0F172A;
  box-shadow: 0 6px 18px -14px rgba(0,151,157,0.4);
}
.scratch-stats .stat {
  border-color: #F2E6CC;
  box-shadow: 0 6px 18px -14px rgba(244,162,26,0.4);
}
.ev3-stats .stat {
  border-color: #FBD3DC;
  box-shadow: 0 6px 18px -14px rgba(225,29,72,0.4);
}
.advasbot-stats .stat {
  border-color: #CDEEFB;
  box-shadow: 0 6px 18px -14px rgba(14,165,233,0.4);
}
.arduino-stats .stat strong { color: #00979D; }
.scratch-stats .stat strong { color: #F4A21A; }
.ev3-stats .stat strong { color: #E11D48; }
.advasbot-stats .stat strong { color: #0EA5E9; }

/* Level-jump nav */
.level-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin: 32px 0 48px;
}
.level-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink);
  text-decoration: none;
  background: #fff;
  transition: border-color .15s ease, transform .15s ease;
}
.level-nav a:hover {
  transform: translateY(-1px);
  text-decoration: none;
}
.hero--arduino ~ main .level-nav a:hover { border-color: #00979D; }
.hero--scratch ~ main .level-nav a:hover { border-color: #F4A21A; }
.hero--ev3 ~ main .level-nav a:hover { border-color: #E11D48; }
.hero--advasbot ~ main .level-nav a:hover { border-color: #0EA5E9; }

/* Cluster labels grouping lesson cards within a level */
.cluster-label {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 24px 0 4px;
  padding-left: 4px;
}
.cluster-label:first-child { margin-top: 0; }

/* Lesson cards rendered as links (Arduino, Scratch pattern) */
a.lesson-card { color: inherit; text-decoration: none; }
a.lesson-card:hover { text-decoration: none; }

/* ============================================================
   Level scroller — vertical quick-jump nav on dashboard pages
   ============================================================ */
.level-scroller {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  pointer-events: none;
}
.level-scroller ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: auto;
}
.level-scroller__home {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 36px;
  margin: 0 0 10px;
  border-radius: 8px;
  background: #1E293B;
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  position: relative;
  box-shadow: 0 2px 8px -3px rgba(15, 23, 42, 0.45);
  pointer-events: auto;
  transition: width .15s ease, transform .12s ease, box-shadow .15s ease,
              background .15s ease;
}
.level-scroller__home:hover {
  width: 34px;
  background: #0F172A;
  transform: scale(1.04);
  box-shadow: 0 4px 12px -3px rgba(15, 23, 42, 0.5);
  text-decoration: none;
}
.level-scroller__home:active { transform: scale(0.97); }
.level-scroller__home:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(15, 23, 42, 0.5);
}
.level-scroller__home-icon {
  display: block;
  pointer-events: none;
}
.level-scroller__bar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 44px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  color: #fff;
  font-weight: 800;
  font-size: 0.78rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  letter-spacing: 0.02em;
  user-select: none;
  position: relative;
  box-shadow: 0 2px 8px -3px rgba(15, 23, 42, 0.35);
  transition: width .15s ease, transform .12s ease, box-shadow .15s ease;
}
.level-scroller__bar:hover {
  width: 34px;
  transform: scale(1.04);
  box-shadow: 0 4px 12px -3px rgba(15, 23, 42, 0.4);
}
.level-scroller__bar:active {
  transform: scale(0.97);
}
.level-scroller__bar:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(15, 23, 42, 0.4);
}
.level-scroller__num {
  position: relative;
  z-index: 1;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
}
.level-scroller__tooltip {
  position: absolute;
  right: calc(100% + 14px);
  top: 50%;
  transform: translateY(-50%);
  background: rgba(15, 23, 42, 0.95);
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  white-space: nowrap;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
  letter-spacing: 0;
  box-shadow: 0 10px 24px -8px rgba(15, 23, 42, 0.4);
  pointer-events: none;
  animation: levelScrollerTooltipIn .12s ease;
}
.level-scroller__tooltip::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: rgba(15, 23, 42, 0.95);
}
@keyframes levelScrollerTooltipIn {
  from { opacity: 0; transform: translate(4px, -50%); }
  to   { opacity: 1; transform: translate(0, -50%); }
}
/* Hide on narrow screens — saves space for the cards */
@media (max-width: 900px) {
  .level-scroller { display: none; }
}

/* ============================================================
   Lesson resource — floating button + dialog (on lesson pages)
   ============================================================ */

.lesson-resource-fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.35);
}
.lesson-resource-fab:hover { filter: brightness(1.07); }
.lesson-resource-fab:focus-visible {
  outline: 3px solid rgba(99, 102, 241, 0.45);
  outline-offset: 2px;
}

.lesson-resource-dialog {
  border: none;
  border-radius: 16px;
  padding: 0;
  width: min(720px, 94vw);
  max-height: 88vh;
  background: #fff;
  color: #0F172A;
  box-shadow: 0 24px 60px rgba(15, 23, 42, 0.35);
}
.lesson-resource-dialog::backdrop {
  background: rgba(15, 23, 42, 0.55);
}

.lrd__panel { display: flex; flex-direction: column; max-height: 88vh; }

.lrd__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid #E2E8F0;
}
.lrd__eyebrow {
  margin: 0 0 2px;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #6366F1;
}
.lrd__title { margin: 0; font-size: 1.15rem; font-weight: 800; }
.lrd__close {
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  border: 1px solid #E2E8F0;
  background: #F8FAFC;
  color: #475569;
  border-radius: 8px;
  width: 34px;
  height: 34px;
  cursor: pointer;
  flex-shrink: 0;
}
.lrd__close:hover { background: #F1F5F9; color: #0F172A; }

.lrd__body {
  padding: 16px 20px 20px;
  overflow-y: auto;
  display: grid;
  gap: 20px;
}

.lrd__section { display: grid; gap: 8px; }
.lrd__section-title {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #475569;
}

.lrd__image {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid #E2E8F0;
}

.lrd__embed {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid #E2E8F0;
  background: #000;
}
.lrd__embed--pdf { aspect-ratio: 4 / 5; background: #F1F5F9; }
.lrd__embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.lrd__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: #4F46E5;
  text-decoration: none;
  word-break: break-all;
}
.lrd__link:hover { text-decoration: underline; }

.lrd__hint { margin: 0; font-size: 0.84rem; color: #64748B; }

.lrd__local {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.lrd__local-path {
  flex: 1;
  min-width: 0;
  font-size: 0.84rem;
  background: #F1F5F9;
  border: 1px solid #E2E8F0;
  border-radius: 8px;
  padding: 8px 12px;
  word-break: break-all;
}
.lrd__copy {
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  color: #334155;
  background: #fff;
  border: 1px solid #CBD5E1;
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  flex-shrink: 0;
}
.lrd__copy:hover { border-color: #6366F1; color: #4F46E5; }

@media (max-width: 600px) {
  .lesson-resource-fab { right: 12px; bottom: 12px; padding: 11px 15px; }
}

/* ============================================================
   EV3 Robotics — landing + lesson pages
   ============================================================ */

.ev3-page { min-height: 100vh; display: flex; flex-direction: column; }

.ev3-hero {
  max-width: 1000px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  text-align: center;
}
.ev3-hero__eyebrow {
  margin: 0 0 6px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6366F1;
  font-size: 0.8rem;
}
.ev3-hero__title { margin: 0 0 10px; font-size: 2.4rem; font-weight: 800; }
.ev3-hero__sub { margin: 0 auto; max-width: 560px; color: #475569; }
.ev3-hero__count { margin-top: 14px; font-weight: 600; color: #64748B; }

.ev3-levels {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 12px 24px 56px;
  display: grid;
  gap: 36px;
}
.ev3-level__name {
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 2px solid #EEF2FF;
  padding-bottom: 8px;
}
.ev3-level__count { font-size: 0.85rem; font-weight: 600; color: #94A3B8; }
.ev3-level__empty { color: #94A3B8; }

.ev3-grid {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}
.ev3-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 14px 16px;
  background: #fff;
  border: 1px solid #E2E8F0;
  border-radius: 12px;
  text-decoration: none;
  color: #0F172A;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.ev3-card:hover {
  border-color: #6366F1;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.12);
  transform: translateY(-2px);
}
.ev3-card__code {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #6366F1;
  background: #EEF2FF;
  border-radius: 5px;
  padding: 2px 8px;
  width: max-content;
}
.ev3-card__title { font-weight: 600; font-size: 0.95rem; }

/* lesson page */
.ev3-lesson__hero {
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 24px 8px;
}
.ev3-lesson__crumbs { font-size: 0.85rem; color: #64748B; margin: 0 0 12px; }
.ev3-lesson__crumbs a { color: #6366F1; text-decoration: none; }
.ev3-lesson__crumbs .sep { margin: 0 8px; color: #CBD5E1; }
.ev3-lesson__code {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #6366F1;
  background: #EEF2FF;
  border-radius: 6px;
  padding: 3px 10px;
}
.ev3-lesson__title { margin: 10px 0 0; font-size: 2rem; font-weight: 800; }

.ev3-lesson__body {
  flex: 1;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 24px 56px;
  display: grid;
  gap: 28px;
}
.ev3-placeholder {
  background: #F8FAFC;
  border: 1px dashed #CBD5E1;
  border-radius: 14px;
  padding: 28px;
  text-align: center;
}
.ev3-placeholder h2 { margin: 0 0 8px; font-size: 1.2rem; }
.ev3-placeholder p { margin: 0 auto; max-width: 460px; color: #64748B; }

/* Authored lesson body (markdown) for the robotics courses */
.lesson-md { color: #1E293B; line-height: 1.65; font-size: 1rem; }
.lesson-md h1, .lesson-md h2, .lesson-md h3 { line-height: 1.25; color: #0F172A; }
.lesson-md h1 { font-size: 1.6rem; margin: 0 0 14px; }
.lesson-md h2 { font-size: 1.3rem; margin: 28px 0 10px; padding-bottom: 6px; border-bottom: 2px solid #E2E8F0; }
.lesson-md h3 { font-size: 1.1rem; margin: 20px 0 8px; }
.lesson-md p { margin: 0 0 14px; }
.lesson-md ul, .lesson-md ol { margin: 0 0 14px; padding-left: 24px; }
.lesson-md li { margin: 4px 0; }
.lesson-md a { color: #0EA5E9; }
.lesson-md strong { color: #0F172A; }
.lesson-md code {
  font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 0.88em;
  background: #F1F5F9; padding: 1px 5px; border-radius: 4px;
}
.lesson-md pre {
  background: #0F172A; color: #E2E8F0; padding: 14px 16px; border-radius: 10px;
  overflow-x: auto; margin: 0 0 16px;
}
.lesson-md pre code { background: transparent; color: inherit; padding: 0; font-size: 0.85rem; }
.lesson-md img { max-width: 100%; height: auto; border-radius: 10px; margin: 6px 0; }
.lesson-md blockquote {
  margin: 0 0 14px; padding: 8px 14px; border-left: 4px solid #0EA5E9;
  background: #F0F9FF; color: #334155; border-radius: 0 8px 8px 0;
}
.lesson-md table { border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 0.92rem; }
.lesson-md th, .lesson-md td { border: 1px solid #E2E8F0; padding: 7px 10px; text-align: left; }
.lesson-md th { background: #F8FAFC; }
.lesson-md hr { border: none; border-top: 1px solid #E2E8F0; margin: 24px 0; }

.ev3-resources { display: grid; gap: 22px; }
.ev3-resources__title {
  font-size: 1.1rem;
  font-weight: 800;
  border-bottom: 2px solid #EEF2FF;
  padding-bottom: 8px;
  margin: 0;
}
.ev3-res { display: grid; gap: 8px; }
.ev3-res h3 {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #475569;
}
.ev3-res__image {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid #E2E8F0;
}
.ev3-res__hint { margin: 0; font-size: 0.85rem; color: #64748B; }

.ev3-embed {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid #E2E8F0;
  background: #000;
}
.ev3-embed--pdf { aspect-ratio: 4 / 5; background: #F1F5F9; }
.ev3-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.ev3-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: #4F46E5;
  text-decoration: none;
  word-break: break-all;
}
.ev3-link:hover { text-decoration: underline; }

.ev3-local { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ev3-local__path {
  flex: 1;
  min-width: 0;
  font-size: 0.85rem;
  background: #F1F5F9;
  border: 1px solid #E2E8F0;
  border-radius: 8px;
  padding: 8px 12px;
  word-break: break-all;
}
.ev3-copy {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
  background: #fff;
  border: 1px solid #CBD5E1;
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
  flex-shrink: 0;
}
.ev3-copy:hover { border-color: #6366F1; color: #4F46E5; }