/* practice-tab.css — Phase 5: Practice tab styles
 *
 * Layout:
 *   .subtabs          pill row container (All / Drills / Mock)
 *   .filter-bar       chip row above question list
 *   .q-row            grid row per question
 *   .mock-card        large card on the Mock sub-tab
 *
 * All visual tokens come from tokens.css; this file pulls patterns from
 * prototype-v2.html (practice tab section).
 */

/* ---------- Sub-tabs ---------- */
.subtabs {
  display: flex;
  gap: 2px;
  background: var(--bg-3);
  border-radius: var(--r-md);
  padding: 3px;
  width: fit-content;
  margin-bottom: 16px;
}
.subtab {
  background: transparent;
  border: 0;
  padding: 5px 12px;
  font-size: var(--fs-md);
  color: var(--text-3);
  cursor: pointer;
  border-radius: var(--r-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
  font-weight: 500;
}
.subtab:hover { color: var(--text); }
.subtab.active { background: var(--bg); color: var(--text); }
.subtab .count {
  font-size: var(--fs-sm);
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
}

/* ---------- Filter chip bar ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 0 0 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
  align-items: center;
}
.filter-label {
  font-size: var(--fs-xs);
  color: var(--text-4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 4px;
  font-weight: 600;
}
.filter-label.spacer { margin-left: 14px; }

.chip {
  padding: 3px 9px;
  border: 1px solid var(--border-hi);
  border-radius: 12px;
  font-size: var(--fs-sm);
  color: var(--text-2);
  cursor: pointer;
  background: transparent;
  font-weight: 500;
  font-family: inherit;
}
.chip:hover { background: var(--bg-3); color: var(--text); }
.chip.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

/* ---------- Question row ---------- */
.q-list { display: flex; flex-direction: column; }

.q-row {
  display: grid;
  grid-template-columns: 16px 90px 1fr 50px 90px;
  gap: 14px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  align-items: center;
  background: transparent;
  border-left: 0;
  border-right: 0;
  border-top: 0;
  text-align: left;
  font: inherit;
  color: inherit;
}
.q-row:hover { background: var(--bg-2); }
.q-row .qpos {
  font-size: var(--fs-sm);
  color: var(--text-3);
  font-family: var(--font-mono);
}
.q-row .qpos b { color: var(--text); font-weight: 600; }
.q-row .title { font-size: var(--fs-base); font-weight: 500; color: var(--text); }
.q-row .meta  { font-size: var(--fs-sm); color: var(--text-3); margin-top: 2px; }
.q-row .pts   {
  font-size: var(--fs-sm);
  color: var(--text-3);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.q-row .action {
  text-align: right;
  font-size: var(--fs-sm);
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 4px;
  justify-content: flex-end;
}

/* ---------- Empty state ---------- */
.practice-empty {
  border: 1px dashed var(--border-hi);
  border-radius: var(--r-lg);
  padding: 22px;
  color: var(--text-3);
  font-size: var(--fs-md);
  line-height: 1.55;
  background: var(--bg-2);
}
.practice-empty b { color: var(--text-2); font-weight: 600; }

/* ---------- Mock card ---------- */
.mock-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 22px;
  margin-top: 22px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 22px;
  align-items: center;
}
.mock-card .icon-box {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-hi);
  border-radius: var(--r-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}
.mock-card h3 { margin: 0 0 4px; font-size: var(--fs-lg); font-weight: 600; color: var(--text); }
.mock-card p  { margin: 0; color: var(--text-3); font-size: var(--fs-md); line-height: 1.5; }
.mock-card .mock-prev { margin-top: 6px; font-size: var(--fs-sm); }

.btn-big {
  background: var(--text);
  color: var(--bg);
  border: 1px solid var(--text);
  font-weight: 600;
  font-size: var(--fs-base);
  padding: 11px 22px;
  border-radius: 7px;
  cursor: pointer;
  font-family: inherit;
}
.btn-big:hover { background: #e5e5e5; }
.btn-big.ghost {
  background: transparent;
  color: var(--text-2);
  border-color: var(--border-hi);
}
.btn-big.ghost:hover { color: var(--text); border-color: var(--text-3); }

/* ---------- Modal (question solve modal) ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal {
  position: relative;
  max-width: 720px;
  width: 100%;
  max-height: 80vh;
  background: var(--bg-2);
  border: 1px solid var(--border-hi);
  border-radius: var(--r-xl);
  padding: 32px;
  overflow-y: auto;
  color: var(--text);
}
.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 28px;
  height: 28px;
  background: transparent;
  border: 0;
  color: var(--text-3);
  font-size: 18px;
  cursor: pointer;
  border-radius: var(--r-sm);
}
.modal-close:hover { background: var(--bg-3); color: var(--text); }
.modal h2 {
  margin: 0 0 4px;
  font-size: var(--fs-xl);
  font-weight: 600;
}
.modal .modal-sub {
  color: var(--text-3);
  font-size: var(--fs-sm);
  margin-bottom: 18px;
  font-family: var(--font-mono);
}
.modal-prompt {
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.55;
  white-space: pre-wrap;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 12px 14px;
  margin-top: 8px;
}
.modal-header { margin-bottom: 18px; }
.modal-summary {
  margin-top: 16px;
  font-size: var(--fs-md);
}
.modal-summary summary {
  cursor: pointer;
  color: var(--text-3);
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  padding: 6px 0;
  user-select: none;
}
.modal-summary summary:hover { color: var(--text-2); }
.modal-summary[open] summary { color: var(--text); }
.modal-toggle {
  margin-top: 14px;
  background: transparent;
  border: 1px solid var(--border-hi);
  color: var(--text-2);
  padding: 6px 12px;
  border-radius: var(--r-md);
  font-size: var(--fs-md);
  cursor: pointer;
  font-family: inherit;
}
.modal-toggle:hover { color: var(--text); border-color: var(--text-3); }
.modal-figures {
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 500px;
  overflow-y: auto;
}
.modal-figures.primary {
  max-height: 720px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 12px;
  background: var(--bg);
}
.modal-figures.primary img {
  max-width: 100%;
  background: #ffffff;
  border-radius: 4px;
  border: none;
  cursor: zoom-in;
  display: block;
}
.modal-figures-label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  font-weight: 600;
  margin-bottom: 8px;
}
.modal-figures img {
  max-width: 100%;
  background: #ffffff;
  border-radius: 6px;
  border: 1px solid var(--border);
  cursor: zoom-in;
}
.modal-figures img:hover { border-color: var(--border-hi); }
.modal-solution {
  margin-top: 10px;
  font-size: var(--fs-base);
  color: var(--text-2);
  line-height: 1.6;
  white-space: pre-wrap;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 14px 16px;
}
.modal-solution.hidden { display: none; }

.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 22px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}
.modal-actions .btn {
  flex: 1;
  justify-content: center;
  padding: 9px 14px;
  font-size: var(--fs-base);
  font-weight: 600;
}
.modal-actions .btn.correct { color: var(--green); border-color: rgba(34, 197, 94, 0.4); }
.modal-actions .btn.correct:hover { background: rgba(34, 197, 94, 0.08); }
.modal-actions .btn.wrong   { color: var(--red); border-color: rgba(239, 68, 68, 0.4); }
.modal-actions .btn.wrong:hover { background: rgba(239, 68, 68, 0.08); }
.modal-actions .btn.skip    { color: var(--text-3); }

/* ---------- Drill sub-tab list ---------- */
.drill-list { display: flex; flex-direction: column; gap: 6px; }
.drill-row {
  display: grid;
  grid-template-columns: 16px 1fr 80px 120px;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--bg-2);
  cursor: pointer;
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: background 0.08s, border-color 0.08s;
}
.drill-row:hover { background: var(--bg-3); border-color: var(--border-hi); }
.drill-row .title { font-size: var(--fs-base); color: var(--text); font-weight: 500; }
.drill-row .meta  { font-size: var(--fs-sm); color: var(--text-3); margin-top: 2px; }
.drill-row .score {
  font-size: var(--fs-sm);
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  text-align: center;
}
.drill-row .action {
  text-align: right;
  font-size: var(--fs-sm);
  color: var(--text-2);
}

/* ---------- Mock exam view (fullscreen takeover) ---------- */
.mock-view {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 90;
  display: flex;
  flex-direction: column;
  color: var(--text);
}
.mock-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  gap: 16px;
}
.mock-header .mh-left  { font-size: var(--fs-md); color: var(--text-3); }
.mock-header .mh-left b { color: var(--text); font-weight: 600; }
.mock-header .mh-timer {
  font-family: var(--font-mono);
  font-size: var(--fs-3xl);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  color: var(--text);
}
.mock-header .mh-timer.urgent { color: var(--red); }
.mock-header .mh-right {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.mock-body {
  flex: 1;
  overflow-y: auto;
  padding: 32px max(24px, 8vw);
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
}
.mock-qmeta {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--text-3);
}
.mock-qtitle {
  font-size: var(--fs-2xl);
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.mock-qprompt {
  font-size: 15px;
  color: var(--text);
  line-height: 1.6;
  white-space: pre-wrap;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 16px 18px;
}
.mock-answer {
  width: 100%;
  min-height: 220px;
  background: var(--bg-2);
  border: 1px solid var(--border-hi);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  padding: 14px 16px;
  resize: vertical;
}
.mock-answer:focus {
  outline: none;
  border-color: var(--accent);
}

.mock-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  gap: 12px;
}
.mock-progress-pills {
  display: flex;
  gap: 4px;
}
.mock-pill {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-3);
  border: 1px solid var(--border-hi);
  color: var(--text-3);
  font-size: var(--fs-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}
.mock-pill.answered { background: var(--bg-4); color: var(--text); }
.mock-pill.current { border-color: var(--accent); color: var(--text); }

/* Grading screen */
.mock-grade {
  flex: 1;
  overflow-y: auto;
  padding: 32px max(24px, 8vw);
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
}
.mock-grade h2 { margin: 0 0 6px; font-size: var(--fs-3xl); font-weight: 600; }
.mock-grade .sub { color: var(--text-3); font-size: var(--fs-md); margin-bottom: 24px; }
.mock-grade .score-banner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: 22px;
}
.mock-grade .score-banner .cell {
  background: var(--bg-2);
  padding: 14px 16px;
}
.mock-grade .score-banner .label {
  font-size: var(--fs-xs);
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-bottom: 4px;
}
.mock-grade .score-banner .value {
  font-size: var(--fs-3xl);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.grade-q {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 14px 16px;
  margin-bottom: 8px;
  background: var(--bg-2);
}
.grade-q .gq-head {
  display: flex;
  justify-content: space-between;
  font-size: var(--fs-sm);
  color: var(--text-3);
  font-family: var(--font-mono);
  margin-bottom: 6px;
}
.grade-q .gq-title { font-size: var(--fs-base); color: var(--text); font-weight: 500; margin-bottom: 8px; }
.grade-q .gq-actions { display: flex; gap: 6px; margin-top: 8px; }
.grade-q .gq-actions .btn { padding: 4px 10px; font-size: var(--fs-sm); }
.grade-q.correct { border-left: 3px solid var(--green); }
.grade-q.wrong   { border-left: 3px solid var(--red); }
.grade-q.skip    { border-left: 3px solid var(--text-4); }