/* ==========================================================================
   Training session screen
   The exercise is the focus: a quiet bar, the table, the question, the answers.
   ========================================================================== */

/* ---- Focus mode: during an exercise the navigation steps aside --------------- */

.shell.in-session { grid-template-columns: minmax(0, 1fr); }
.shell.in-session .sidebar { display: none; }
.shell.in-session .main { padding-top: var(--s-5); padding-bottom: var(--s-7); }

.session {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
}

/* ---- Top bar ------------------------------------------------------------------ */

.session__bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--s-4);
}
.session__meta { display: flex; align-items: center; gap: var(--s-3) var(--s-4); min-width: 0; flex-wrap: wrap; row-gap: 2px; }
.session__logo { width: 26px; height: 26px; border-radius: 4px; }
.session__title { font-size: var(--fs-small); font-weight: 500; color: var(--text); }
.session__count {
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.session__right { display: flex; align-items: center; gap: var(--s-4); }

/* Thin gold progress line under the bar */
.session__progress { position: relative; height: 2px; border-radius: 2px; background: var(--line); overflow: hidden; }
.session__progress[hidden] { display: block; visibility: hidden; }
.session__progress-fill { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--accent); transition: width 320ms var(--ease-out); }

.session__timer {
  min-width: 4.2ch;
  font-family: var(--font-display);
  font-size: 1.625rem;
  line-height: 1;
  color: var(--ivory);
  font-variant-numeric: lining-nums tabular-nums;
  text-align: right;
}
.session__timer.is-low { color: var(--negative); }

.session__streak {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--accent-hi);
  white-space: nowrap;
}
.session__streak svg { width: 16px; height: 16px; }
.session__streak.bump { animation: bump 320ms var(--ease-out); }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-2);
  color: var(--text-2);
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease), background-color var(--dur-1) var(--ease);
}
.icon-btn:hover { color: var(--ivory); border-color: var(--line-3); background: var(--surface); }
.icon-btn:active { background: var(--surface-2); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn[hidden] { display: none; }

/* ---- Intro ------------------------------------------------------------------ */

.session__intro {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--s-4);
  width: 100%;
  max-width: 600px;
  min-height: calc(100vh - 160px); /* vertically centred: no empty lower half */
  min-height: calc(100dvh - 160px);
  justify-content: center;
  margin: 0 auto;
  padding: var(--s-5) 0;
}
.session__intro-title { font-size: clamp(2.5rem, 2rem + 2.4vw, 4rem); }
.session__intro-text { font-size: var(--fs-lead); color: var(--text-2); }

.table-choice { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; margin-top: var(--s-2); }

/* ---- Exercise ------------------------------------------------------------- */

.exercise { display: flex; flex-direction: column; gap: var(--s-4); }
.exercise__bottom { animation: fade 160ms var(--ease) both; }

.exercise__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
}
.exercise__prompt {
  font-family: var(--font-display);
  font-size: clamp(1.625rem, 1.3rem + 1vw, 2.125rem);
  line-height: 1.1;
  color: var(--ivory);
  text-align: center;
}

.answers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s-3);
}
.answers--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.answer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  padding: 0 var(--s-5);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: var(--fs-body);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-align: center;
  color: var(--ivory);
  transition: border-color var(--dur-1) var(--ease), background-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}
.answer:hover:not(:disabled) { border-color: var(--accent); background: var(--surface-2); }
.answer:active:not(:disabled) { transform: translateY(1px); background: var(--surface-3); }
.answer__key {
  position: absolute;
  top: 6px;
  left: 8px;
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}
.answer:disabled { cursor: default; opacity: 0.4; }
.answer.is-right { opacity: 1; border-color: var(--positive); background: var(--positive-wash); }
.answer.is-wrong { opacity: 1; border-color: var(--negative); background: var(--negative-wash); }

@media (hover: none) {
  .answer__key { display: none; }
}

@media (max-width: 767px) {
  .answers--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .answer { min-height: 54px; padding: 0 var(--s-2); }
}

/* ---- Feedback --------------------------------------------------------------- */

.feedback {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding: var(--s-5) var(--s-6);
  border: 1px solid var(--line);
  border-top: 2px solid var(--positive);
  border-radius: var(--radius);
  background: var(--surface);
  animation: rise 200ms var(--ease-out) both;
}
.feedback.is-wrong { border-top-color: var(--negative); }

.feedback__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--s-2) var(--s-5); }
.feedback__verdict {
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--positive);
}
.feedback.is-wrong .feedback__verdict { color: var(--negative); }
.feedback__stat { font-size: var(--fs-small); color: var(--text-2); }
.feedback__xp { font-size: var(--fs-small); font-weight: 600; color: var(--accent-hi); }
.feedback__headline {
  margin-top: var(--s-2);
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.05;
  color: var(--ivory);
}
.feedback__mark { margin-right: 10px; color: var(--accent); font-family: var(--font-ui); font-size: 0.7em; vertical-align: 0.12em; }
.feedback__detail { color: var(--text-2); }
.feedback__actions { display: flex; align-items: center; gap: var(--s-3); margin-top: var(--s-3); }

.unlocks { display: flex; flex-direction: column; gap: 4px; margin-top: var(--s-2); }
.unlocks li { display: flex; align-items: center; gap: var(--s-2); font-size: var(--fs-small); color: var(--accent-hi); }
.unlocks li::before { content: ""; width: 5px; height: 5px; transform: rotate(45deg); background: var(--accent); }

@media (max-width: 767px) {
  .feedback { padding: var(--s-4); }
  .feedback__headline { font-size: 1.5rem; }
  .feedback__actions .btn { width: 100%; }
}

/* ---- Pause ------------------------------------------------------------------ */

.session.is-paused .session__body { visibility: hidden; }
.session__overlay {
  position: absolute;
  inset: 72px 0 auto 0;
  display: grid;
  place-items: center;
  padding: var(--s-8) var(--s-4);
}
.session__overlay[hidden] { display: none; }
.pause { display: flex; flex-direction: column; align-items: center; gap: var(--s-4); text-align: center; }
.pause__title { font-size: 3rem; }

/* ---- Summary ---------------------------------------------------------------- */

.summary {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--s-5);
  width: 100%;
  max-width: 880px;
  margin: 0 auto;
  padding: var(--s-5) 0;
}
.summary__title { font-size: clamp(2.5rem, 2rem + 2vw, 3.5rem); }
.summary__figures {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--s-4);
  width: 100%;
  margin: 0;
  padding: var(--s-5) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.summary__figures div { display: flex; flex-direction: column; gap: var(--s-2); }
.summary__figures dd { margin: 0; font-size: 2.25rem; }
.summary__rank {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  width: 100%;
  max-width: 520px;
  padding: var(--s-4) var(--s-5);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.summary__rank:hover { border-color: var(--line-2); }
.summary__rank-name { font-family: var(--font-display); font-size: 1.5rem; line-height: 1.1; color: var(--ivory); }

@media (max-width: 767px) {
  .session__title { display: none; }
  .session__intro { min-height: 0; padding-top: var(--s-4); }
  .summary__figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .summary__figures div:last-child { grid-column: 1 / -1; }
  .summary__figures dd { font-size: 2rem; }
  .session__bar { gap: var(--s-3); }
  .session__timer { font-size: 1.375rem; }
}