/* erg shared stylesheet
   Brand tokens live in :root. Change a color or font here and every page updates. */

:root {
  --violet-900: #2a1a4a;
  --violet-700: #4b2f82;
  --violet-500: #6d4bb5;
  --lavender-200: #ddd2f3;
  --lavender-100: #efe9fa;
  --lavender-50: #f8f5fd;
  --amber-500: #e0a526;
  --amber-600: #c48a12;
  --amber-100: #fdf1d6;
  --ink: #1f1830;
  --ink-soft: #4a4260;
  --muted: #736b88;
  --panel: #ffffff;
  --border: #d9d0ea;
  --page: var(--lavender-50);
  --radius: 10px;
  --wordmark: "Nunito", system-ui, sans-serif;
  --body: "DM Sans", system-ui, sans-serif;
}

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

body {
  font-family: var(--body);
  background: var(--page);
  color: var(--ink);
  line-height: 1.65;
  font-size: 16px;
}

a { color: var(--violet-700); }
a:hover { color: var(--violet-500); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--violet-900);
  color: #fff;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}
.brand:hover { color: #fff; }
.brand img { width: 34px; height: 34px; }
.wordmark {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: 30px;
  letter-spacing: -0.02em;
  line-height: 1;
}
.site-nav a {
  color: var(--lavender-200);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  margin-left: 20px;
}
.site-nav a:hover { color: var(--amber-500); }

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--violet-900) 0%, var(--violet-700) 100%);
  color: #fff;
  padding: 56px 0 64px;
}
.descriptor {
  font-family: var(--wordmark);
  font-weight: 700;
  color: var(--amber-500);
  letter-spacing: 0.04em;
  font-size: 15px;
  margin-bottom: 14px;
}
.hero h1 {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.12;
  max-width: 760px;
  margin-bottom: 18px;
}
.hero p {
  color: var(--lavender-200);
  max-width: 640px;
  font-size: 17px;
}

/* Sections */
main { padding: 48px 0 72px; }
.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 22px;
}

/* Module cards */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.module-card {
  background: var(--panel);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  transition: transform .15s, box-shadow .15s;
}
a.module-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 26px rgba(42, 26, 74, .12);
  color: var(--ink);
}
.module-card.planned { opacity: .6; }
.module-num {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--violet-500);
}
.module-card h3 {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.25;
}
.module-card p { color: var(--ink-soft); font-size: 15px; flex: 1; }
.tag {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  padding: 3px 12px;
}
.tag.live { background: var(--amber-100); color: #7a5306; }
.tag.planned { background: var(--lavender-100); color: var(--muted); }

/* Lesson layout */
.lesson-head {
  background: var(--violet-900);
  color: #fff;
  padding: 40px 0 44px;
}
.lesson-head .module-num { color: var(--amber-500); }
.lesson-head h1 {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: clamp(28px, 4.5vw, 40px);
  line-height: 1.15;
  margin: 8px 0 12px;
}
.lesson-head p { color: var(--lavender-200); max-width: 680px; }

.step {
  background: var(--panel);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 22px;
}
.step h2 {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: 22px;
  margin-bottom: 10px;
}
.step h2 .n {
  display: inline-block;
  width: 30px; height: 30px;
  line-height: 30px;
  text-align: center;
  border-radius: 50%;
  background: var(--violet-700);
  color: #fff;
  font-size: 15px;
  margin-right: 10px;
  vertical-align: 2px;
}
.step p + p { margin-top: 10px; }

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 18px 0;
}
.controls label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.controls output { color: var(--violet-700); font-weight: 700; }
input[type=range] { width: 100%; accent-color: var(--violet-700); }
input[type=number], textarea {
  width: 100%;
  font: inherit;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
textarea { min-height: 90px; resize: vertical; }

.btn {
  font: inherit;
  font-weight: 600;
  background: var(--violet-700);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 10px 20px;
  cursor: pointer;
}
.btn:hover { background: var(--violet-500); }
.btn:disabled { background: var(--muted); cursor: wait; }
.btn.secondary {
  background: transparent;
  color: var(--violet-700);
  border: 1.5px solid var(--violet-700);
}

.status {
  font-size: 13px;
  color: var(--muted);
  margin-top: 10px;
}
.status.ready { color: #2f7a4d; }
.status.error { color: #a3312a; }

.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.stat {
  background: var(--lavender-50);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.stat .label { font-size: 13px; color: var(--muted); }
.stat .value {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: 26px;
  color: var(--violet-900);
}

.chart { width: 100%; min-height: 360px; }

.callout {
  background: var(--amber-100);
  border-left: 4px solid var(--amber-500);
  border-radius: 6px;
  padding: 14px 18px;
  margin-top: 16px;
}

details {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin-top: 12px;
  background: var(--lavender-50);
}
summary { cursor: pointer; font-weight: 600; }
details p { margin-top: 10px; }

.hidden { display: none; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 560px) {
  .site-nav a { margin-left: 12px; }
  .step { padding: 20px; }
}

/* Select menus and score tables */
select {
  width: 100%;
  font: inherit;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
.score-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 15px;
}
.score-table th, .score-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.score-table th {
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.btn + .btn { margin-left: 8px; }

/* Multiple-choice predictions */
.choices { display: grid; gap: 10px; margin: 16px 0; }
.choice {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  background: #fff;
  cursor: pointer;
}
.choice:hover { border-color: var(--violet-500); }
.choice input { margin-top: 5px; accent-color: var(--violet-700); }
.choice.locked { cursor: default; opacity: .75; }
.choice.picked { border-color: var(--violet-700); background: var(--lavender-100); opacity: 1; }

/* Explanatory cards within a step */
.channels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 16px;
}
.channel {
  background: var(--lavender-50);
  border: 1px solid var(--border);
  border-top: 4px solid var(--amber-500);
  border-radius: 8px;
  padding: 16px;
  font-size: 15px;
}
.channel h3 {
  font-family: var(--wordmark);
  font-weight: 800;
  font-size: 17px;
  margin-bottom: 6px;
}
.channel .first {
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--violet-700);
}