/* ============================================================
   Just Practice — shared TEST BUILDER template
   Canonical reference: economics/test-builder.html
   Used by every subject's test-builder via window.JP_TESTSET.
   Per-subject brand colour is the only thing that varies:
     override --accent (test action colour) on the page if needed.
   Per-group colour comes from data and is applied inline as
   --g (group colour) / --gs (group soft) on .subject-block.
   ============================================================ */

:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface2: #f0f2f5;
  --border: #e1e4ea;
  --border-strong: #c9cfd8;
  --accent: #2563eb;            /* blue: the "take a test" action colour */
  --accent-soft: #eff4ff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --text: #1a1d23;
  --muted: #6b7280;
}

.tb-wrap { max-width: 880px; margin: 0 auto; padding: 0 20px 60px; }

/* ——— Page header ——— */
header.tb-hero {
  padding: 10px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
  display: flex; align-items: flex-start; justify-content: space-between; gap: 20px;
}
.tb-hero-left h1 {
  font-size: clamp(22px, 3.5vw, 28px);
  font-weight: 700; letter-spacing: -0.3px; line-height: 1.25;
}
.tb-hero-left h1 span { color: var(--accent); }
.tb-hero-left p { color: var(--muted); font-size: 13px; margin-top: 6px; }
.tb-badge {
  background: var(--accent-soft);
  padding: 6px 12px; border-radius: 6px;
  font-size: 11px; font-weight: 600; color: var(--accent);
  letter-spacing: 0.3px; white-space: nowrap;
}

/* ——— Section card ——— */
.tb-section {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px 24px; margin-bottom: 20px;
}
.tb-section.is-hidden { display: none; }
.tb-section-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 16px;
}
.tb-section-title {
  font-size: 13px; font-weight: 600; letter-spacing: 0.5px;
  text-transform: uppercase; color: var(--muted);
}
.tb-select-all {
  font-size: 12px; font-weight: 600; color: var(--accent);
  cursor: pointer; background: none; border: none; font-family: inherit;
  padding: 2px 6px; border-radius: 4px;
}
.tb-select-all:hover { background: var(--accent-soft); }

/* ——— Group block (Part A / Book 1 / etc.) ——— */
.tb-group { margin-bottom: 24px; }
.tb-group:last-child { margin-bottom: 0; }
.tb-group-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; flex-wrap: wrap;
  padding: 10px 14px; border-radius: 10px;
  margin-bottom: 10px;
  background: var(--gs, var(--surface2));
}
.tb-group-head .tb-gh-title {
  font-size: 14px; font-weight: 700;
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--g, var(--text));
}
.tb-group-head .tb-gh-label {
  background: var(--surface); padding: 2px 9px; border-radius: 10px;
  font-size: 10px; letter-spacing: 0.4px; text-transform: uppercase;
  color: var(--g, var(--muted));
}
.tb-group-head .tb-gh-meta { font-size: 12px; color: var(--muted); }
/* per-group select-all only shows when the group is a real parent level */
.tb-group-head .tb-select-all { color: var(--g, var(--accent)); }

/* ——— Unit subgroup ——— */
.tb-unit { margin-bottom: 10px; }
.tb-unit:last-child { margin-bottom: 0; }
.tb-unit-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 10px; background: var(--surface2); border-radius: 6px;
  margin-bottom: 6px;
}
.tb-unit-name { font-size: 12.5px; font-weight: 600; color: var(--text); }
.tb-unit-name .tb-unit-label { color: var(--muted); font-weight: 500; margin-right: 6px; }

/* ——— Chapter rows ——— */
.tb-chapters { display: grid; grid-template-columns: 1fr; gap: 4px; padding-left: 4px; }
@media (min-width: 640px) { .tb-chapters { grid-template-columns: 1fr 1fr; } }
.tb-chapter-row {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: 6px; cursor: pointer;
  font-size: 14px; transition: background 0.12s;
}
.tb-chapter-row:hover { background: var(--gs, var(--accent-soft)); }
.tb-chapter-row input[type=checkbox] {
  width: 16px; height: 16px; cursor: pointer;
  accent-color: var(--g, var(--accent));
}
.tb-chapter-row .tb-ch-label { flex: 1; }
.tb-chapter-row .tb-ch-num { color: var(--muted); font-weight: 500; margin-right: 6px; font-size: 13px; }
.tb-chapter-row .tb-ch-count {
  font-size: 11px; color: var(--muted);
  background: var(--surface2); padding: 2px 7px; border-radius: 4px;
}
.tb-chapter-row.is-empty .tb-ch-count { color: var(--warning); background: var(--warning-soft); }
.tb-chapter-row.is-disabled { opacity: 0.5; cursor: not-allowed; }
.tb-chapter-row.is-disabled input { pointer-events: none; }

/* ——— Chips (difficulty + mix) ——— */
.tb-chip-row { display: flex; flex-wrap: wrap; gap: 10px; }
.tb-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: 20px;
  background: var(--surface2); border: 1.5px solid transparent;
  cursor: pointer; font-size: 13px; font-weight: 500;
  transition: all 0.12s; user-select: none;
}
.tb-chip:hover { border-color: var(--border-strong); }
.tb-chip.is-selected { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.tb-chip input { display: none; }

/* ——— Number + summary ——— */
.tb-field { display: block; }
.tb-field .tb-field-label {
  display: block; font-size: 13px; font-weight: 500;
  color: var(--muted); margin-bottom: 6px;
}
.tb-section input[type=number] {
  width: 100%; padding: 12px 16px;
  border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 20px; font-family: inherit;
  background: var(--surface);
}
.tb-section input[type=number]:focus { outline: none; border-color: var(--accent); }
.tb-mix-block { margin-top: 14px; }
.tb-mix-block.is-hidden { display: none; }

.tb-summary {
  background: var(--surface2); border-radius: 10px;
  padding: 14px 18px; margin-top: 14px;
  font-size: 13px; color: var(--muted);
  display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
}
.tb-summary b { color: var(--text); font-weight: 600; }
.tb-summary.is-warn { background: var(--warning-soft); color: var(--warning); }
.tb-summary.is-warn b { color: var(--warning); }
.tb-summary.is-ok { background: var(--success-soft); color: var(--success); }
.tb-summary.is-ok b { color: var(--success); }

/* ——— Generate button ——— */
.tb-generate {
  width: 100%; margin-top: 8px;
  padding: 14px 18px; border-radius: 10px;
  background: var(--accent); color: #fff; border: none;
  font-size: 15px; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: background 0.12s, transform 0.08s;
}
.tb-generate:hover:not(:disabled) { background: #1d4fd7; }
.tb-generate:active:not(:disabled) { transform: translateY(1px); }
.tb-generate:disabled { background: var(--border-strong); cursor: not-allowed; }
.tb-err { color: var(--danger); font-size: 13px; margin-top: 8px; }