/* ===================================================================
   Page styles for the student site. theme.css supplies the tricolour
   landscape, buttons, cards and typography; this file adds the pieces
   only this site needs.
   =================================================================== */

.mut { color: var(--mut); }

/* ---- filter row ---- */
.filters { display: flex; gap: 9px; flex-wrap: wrap; align-items: center;
  margin-bottom: 18px; }
.filters input, .filters select {
  padding: 10px 13px; border: 1px solid var(--line); border-radius: 10px;
  font-size: 14px; font-family: inherit; background: rgba(255,255,255,.96); }
.filters input { min-width: 240px; }
.filters input:focus, .filters select:focus {
  outline: 0; border-color: var(--saffron);
  box-shadow: 0 0 0 3px rgba(255,153,51,.16); }

.chip { font-size: 12.5px; font-weight: 700; padding: 7px 13px;
  border-radius: 999px; border: 1px solid var(--line); background: #fff;
  cursor: pointer; color: var(--ink-2); }
.chip:hover { border-color: var(--saffron); color: var(--saffron-d); }
.chip.on { background: linear-gradient(135deg, var(--saffron),
  var(--saffron-d)); color: #fff; border-color: transparent; }

/* ---- item lists ---- */
.items { display: grid; gap: 11px; }
.item { background: rgba(255,255,255,.96); border: 1px solid var(--line);
  border-radius: 13px; padding: 15px 17px; cursor: pointer;
  display: flex; gap: 13px; align-items: flex-start; transition: .14s;
  box-shadow: var(--shadow); }
.item:hover { border-color: var(--saffron); transform: translateX(3px); }
.item .n { width: 30px; height: 30px; border-radius: 9px; flex: 0 0 auto;
  background: var(--saffron-pale); color: var(--saffron-d); font-weight: 800;
  font-size: 13px; display: grid; place-items: center; }
.item.done .n { background: var(--green-pale); color: var(--green-d); }
.item.tried .n { background: var(--warn-bg); color: var(--warn); }
.item .t { font-weight: 700; font-size: 15px; line-height: 1.4; }
.item .m { font-size: 12.4px; color: var(--mut); margin-top: 3px;
  font-weight: 600; }
.item .ask { font-size: 14.2px; line-height: 1.55; }

/* ---- practice pad ---- */
.lab { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 800px) { .lab { grid-template-columns: 1fr; } }
.pane { border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  display: flex; flex-direction: column; background: #fff; }
.pbar { background: #F7F9FC; border-bottom: 1px solid var(--line);
  padding: 7px 12px; font-size: 12px; color: var(--mut); font-weight: 700; }
.lab textarea { flex: 1; border: 0; outline: 0; padding: 13px;
  background: var(--code); color: #DCE7F5; font-family: var(--mono);
  font-size: 13px; line-height: 1.6; resize: vertical; min-height: 250px; }
.lab iframe { flex: 1; border: 0; background: #fff; min-height: 250px; }
.acts { display: flex; gap: 9px; margin-top: 13px; flex-wrap: wrap; }

.bar { height: 9px; background: #EAEFF5; border-radius: 99px;
  overflow: hidden; margin: 14px 0 10px; }
.bar i { display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--saffron), var(--green));
  transition: width .4s; }

.chk { display: flex; gap: 10px; align-items: flex-start; padding: 9px 12px;
  border-radius: 9px; margin-bottom: 6px; font-size: 14px; line-height: 1.55; }
.chk.ok { background: var(--ok-bg); color: #0A5C34; }
.chk.no { background: var(--bad-bg); color: #8A2020; }
.chk .ic { font-weight: 900; }

.note { background: var(--warn-bg); border-left: 4px solid #F0A429;
  padding: 11px 14px; border-radius: 0 9px 9px 0; margin: 9px 0;
  font-size: 14px; line-height: 1.6; }
.win { background: var(--ok-bg); border: 1px solid #A9E3C4; color: #0A5C34;
  padding: 14px 16px; border-radius: 12px; margin-top: 12px;
  line-height: 1.6; }

/* ---- quiz ---- */
.opt { border: 1px solid var(--line); border-radius: 11px; padding: 12px 15px;
  margin-bottom: 8px; cursor: pointer; font-size: 14.5px; background: #fff;
  line-height: 1.5; }
.opt:hover { border-color: var(--saffron); background: #FFFCF8; }
.opt.right { background: var(--ok-bg); border-color: #A9E3C4;
  color: #0A5C34; font-weight: 700; }
.opt.wrong { background: var(--bad-bg); border-color: #F1B4B4;
  color: #8A2020; }
.why { display: none; margin-top: 11px; background: #F7FAFD;
  border-radius: 10px; padding: 13px 15px; font-size: 14px;
  line-height: 1.65; }
.why.on { display: block; }

/* ---- steps / dots ---- */
.dots { display: flex; gap: 5px; margin-top: 15px; }
.dot { height: 6px; flex: 1; border-radius: 99px; background: #E7EDF4; }
.dot.on { background: var(--saffron); }
.dot.ok { background: var(--green); }

/* ---- back link ---- */
.back { display: inline-block; margin-bottom: 14px; font-size: 14px;
  font-weight: 700; color: var(--saffron-d); text-decoration: none; }
.back:hover { text-decoration: underline; }

/* ---- mistakes ---- */
.mis { border: 1px solid var(--line); border-radius: 11px; padding: 13px 15px;
  margin-bottom: 9px; font-size: 14px; line-height: 1.65; background: #fff; }
.mis .w { color: var(--bad); font-family: var(--mono); font-size: 13px; }
.mis .r { color: var(--ok); font-family: var(--mono); font-size: 13px; }

/* ---- annotated demo ---- */
.ann { display: grid; gap: 7px; margin-top: 11px; }
.ann .row { display: flex; gap: 11px; font-size: 13.5px; line-height: 1.6;
  background: #F7FAFD; border-radius: 9px; padding: 10px 12px; }
.ann .row b { color: var(--saffron-d); white-space: nowrap;
  font-family: var(--mono); font-size: 12.5px; }

/* ---- the four teaching devices ---- */
.steptag { font-size: 11px; font-weight: 800; letter-spacing: .09em;
  text-transform: uppercase; margin: 0 0 4px; opacity: .85; }

/* map - the mental model, before any detail */
.stepmap { border-left: 4px solid var(--saffron); }
.stepmap .steptag { color: var(--saffron-d); }
.tree { font-family: var(--mono); font-size: 12.5px; line-height: 1.55;
  background: #1e2430; color: #dfe6f2; padding: 15px 17px;
  border-radius: 11px; overflow-x: auto; white-space: pre;
  margin-top: 12px; }

/* key - the one idea that carries marks */
.stepkey { border-left: 4px solid #7C3AED; background: #FCFBFF; }
.stepkey .steptag { color: #7C3AED; }
.stepkey h2 { color: #5B21B6; }

/* full - a complete, runnable page */
.stepfull { border-left: 4px solid var(--green); }
.stepfull .steptag { color: var(--green); }
.fullpv { display: none; width: 100%; height: 340px;
  border: 1px solid var(--line); border-radius: 11px; background: #fff;
  margin-top: 12px; }

/* table - quick revision */
.steptable { border-left: 4px solid #0EA5E9; }
.steptable .steptag { color: #0284C7; }
table.revision { width: 100%; border-collapse: collapse; margin-top: 11px;
  font-size: 14px; }
table.revision td { border-bottom: 1px solid var(--line); padding: 9px 10px;
  vertical-align: top; line-height: 1.55; }
table.revision td:first-child { white-space: nowrap; width: 1%;
  font-family: var(--mono); font-size: 12.5px; }
table.revision tr:last-child td { border-bottom: 0; }
table.revision tr:nth-child(odd) { background: #FAFBFC; }

@media (max-width: 640px) {
  .tree { font-size: 10.5px; }
  table.revision td:first-child { white-space: normal; }
}

/* ---- stats ---- */
.stats { display: grid;
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
  gap: 13px; margin-bottom: 22px; }
.stat { background: rgba(255,255,255,.96); border: 1px solid var(--line);
  border-radius: var(--r); padding: 17px 19px; box-shadow: var(--shadow); }
.stat .n { font-size: 27px; font-weight: 800; line-height: 1;
  color: var(--saffron-d); }
.stat.g .n { color: var(--green-d); }
.stat.b .n { color: #3730A3; }
.stat .l { font-size: 12.4px; color: var(--mut); margin-top: 6px;
  font-weight: 600; line-height: 1.45; }

@media (max-width: 1180px) { .topbar nav a { padding: 8px 8px; font-size: 13px; } }
@media (max-width: 1000px) { .topbar nav a { padding: 7px 6px; font-size: 12.5px; } }

/* ---- mobile menu ---- */
.topbar .menub { display: none; border: 1px solid var(--line);
  background: #fff; border-radius: 9px; width: 38px; height: 38px;
  font-size: 18px; cursor: pointer; color: var(--ink); }
.mnav { display: none; position: sticky; top: 60px; z-index: 29;
  background: rgba(255,255,255,.97); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line); padding: 8px 12px;
  flex-wrap: wrap; gap: 4px; }
.mnav a { color: var(--ink-2); text-decoration: none; font-size: 14px;
  font-weight: 600; padding: 8px 12px; border-radius: 9px; }
.mnav a.on, .mnav a:hover { background: var(--saffron-pale);
  color: var(--saffron-d); }
@media (max-width: 860px) {
  .topbar nav { display: none; }
  .topbar .menub { display: inline-block; }
  .mnav.open { display: flex; }
}