/* Importance levels (سطح ۱ تا ۵): exam setup, level badges, book references and level breakdown. */
.tier-1 { --tier: var(--tier-1); --tier-bg: var(--tier-1-bg); --tier-line: var(--tier-1-line); }
.tier-2 { --tier: var(--tier-2); --tier-bg: var(--tier-2-bg); --tier-line: var(--tier-2-line); }
.tier-3 { --tier: var(--tier-3); --tier-bg: var(--tier-3-bg); --tier-line: var(--tier-3-line); }
.tier-4 { --tier: var(--tier-4); --tier-bg: var(--tier-4-bg); --tier-line: var(--tier-4-line); }
.tier-5 { --tier: var(--tier-5); --tier-bg: var(--tier-5-bg); --tier-line: var(--tier-5-line); }

/* ---------- Setup page ---------- */
.setup-card {
  width: min(100%, 1000px);
  margin: clamp(26px, 6vh, 64px) auto 0;
  padding: clamp(22px, 4vw, 44px);
  border: 1px solid var(--glass-border);
  border-radius: 28px;
  background: rgba(var(--glass), .88);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.setup-hero { text-align: center; }
.setup-hero h1 { margin: 0; font-size: clamp(1.6rem, 4vw, 2.3rem); line-height: 1.35; }
.setup-hero .intro-copy { margin-bottom: 22px; }
.setup-hero .exam-facts { margin: 0 auto 8px; max-width: 620px; }

.setup-section { margin-top: 30px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.section-head h2 { margin: 0; font-size: 1.02rem; }
.section-head span { color: var(--muted); font-size: .76rem; }

.mode-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.mode-card {
  display: flex; align-items: flex-start; gap: 11px; width: 100%;
  padding: 14px 15px; border: 1px solid var(--line); border-radius: 16px;
  color: var(--ink); background: var(--surface); text-align: right; cursor: pointer;
  transition: border-color .16s, box-shadow .16s, transform .16s, background .16s;
}
.mode-card:hover { border-color: var(--primary-line-strong); transform: translateY(-1px); }
.mode-card.is-selected { border-color: var(--primary); background: var(--primary-bg-soft); box-shadow: 0 0 0 3px var(--primary-ring); }
.mode-featured { grid-column: 1 / -1; padding: 17px 18px; background: linear-gradient(120deg, var(--primary-bg-soft), var(--surface) 60%); }
.mode-radio {
  flex: none; width: 18px; height: 18px; margin-top: 3px; border: 2px solid var(--line-strong); border-radius: 50%;
  transition: border-color .16s, box-shadow .16s;
}
.mode-card.is-selected .mode-radio { border-color: var(--primary); box-shadow: inset 0 0 0 3px var(--surface), inset 0 0 0 9px var(--primary); }
.mode-text { display: grid; gap: 2px; min-width: 0; }
.mode-text strong { font-size: .92rem; }
.mode-text strong em {
  display: inline-block; margin-right: 6px; padding: 1px 8px; border-radius: 999px;
  color: var(--primary); background: var(--primary-bg); font-size: .68rem; font-style: normal; vertical-align: 2px;
}
.mode-text > span { color: var(--muted); font-size: .78rem; line-height: 1.6; }
.mode-text bdi, .summary-line bdi, .exam-name bdi, .eyebrow bdi { white-space: nowrap; }

.setup-info {
  margin: 18px 0 0; padding: 14px 16px; border: 1px solid var(--primary-line); border-radius: 14px;
  color: var(--ink-2); background: var(--primary-bg-soft); font-size: .84rem;
}

.tier-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.tier-card {
  position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 5px;
  min-width: 0; padding: 15px 14px 14px; border: 1px solid var(--line); border-radius: 16px;
  color: var(--ink); background: var(--surface); text-align: right; cursor: pointer; overflow: hidden;
  transition: border-color .16s, background .16s, box-shadow .16s, transform .16s;
}
.tier-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: var(--tier); opacity: .35; transition: opacity .16s; }
.tier-card:hover { transform: translateY(-1px); border-color: var(--tier-line); }
.tier-card.is-selected { border-color: var(--tier); background: var(--tier-bg); box-shadow: 0 0 0 3px color-mix(in srgb, var(--tier) 14%, transparent); }
.tier-card.is-selected::before { opacity: 1; }
.tier-check {
  position: absolute; top: 14px; left: 13px; width: 20px; height: 20px; border: 2px solid var(--line-strong); border-radius: 7px;
  background: var(--surface); transition: background .16s, border-color .16s;
}
.tier-card.is-selected .tier-check { border-color: var(--tier-solid); background: var(--tier-solid); }
.tier-card.is-selected .tier-check::after {
  content: ""; position: absolute; top: 2px; left: 5.5px; width: 5px; height: 10px;
  border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg);
}
.tier-card strong { font-size: .96rem; }
.tier-hint { color: var(--muted); font-size: .74rem; line-height: 1.65; }
.tier-count { margin-top: auto; padding-top: 6px; color: var(--tier); font-size: .8rem; font-weight: 800; }

.tier-chip {
  display: inline-flex; align-items: center; gap: 3px; padding: 2px 9px; border-radius: 8px;
  color: var(--tier); background: var(--tier-bg); border: 1px solid var(--tier-line);
  font-size: .7rem; font-weight: 800; white-space: nowrap;
}

.count-options { display: flex; flex-wrap: wrap; gap: 8px; }
.count-option {
  min-width: 64px; padding: 9px 16px; border: 1px solid var(--line); border-radius: 12px;
  color: var(--ink); background: var(--surface); cursor: pointer; font-weight: 700; transition: all .16s;
}
.count-option:hover { border-color: var(--primary-line-strong); }
.count-option.is-selected { border-color: var(--primary-solid); color: #fff; background: var(--primary-solid); box-shadow: 0 6px 16px rgba(69, 89, 230, .22); }

.setup-footer {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--line);
}
.summary-line { display: grid; gap: 4px; margin: 0; color: var(--ink-soft); font-size: .9rem; }
.summary-line strong { color: var(--primary); }
.summary-line.is-warning { color: var(--danger); font-weight: 700; }
.summary-note { color: var(--amber-ink); font-size: .78rem; }
.setup-footer .button-large { flex: none; }
.tier-disclaimer { margin: 18px 0 0; color: var(--muted); font-size: .73rem; text-align: center; line-height: 1.9; }

/* ---------- Question page ---------- */
.tier-badge {
  display: flex; align-items: center; gap: 6px; flex: none; padding: 5px 9px; border-radius: 9px;
  color: var(--tier); background: var(--tier-bg); border: 1px solid var(--tier-line); font-size: .74rem; font-weight: 700;
}
.tier-badge b { font-weight: 800; white-space: nowrap; }
.tier-badge span { color: color-mix(in srgb, var(--tier) 80%, var(--ink)); font-weight: 600; }
.tier-badge.tier-1 { box-shadow: 0 6px 16px rgba(219, 47, 72, .14); }
.tier-badge:not(.tier-1) { opacity: .92; }

.legend-star { margin-left: 5px; color: var(--danger-ink); font-size: 10px; font-style: normal; }
.review-state { color: var(--primary); font-weight: 700; }

/* Study panel after answering: hint + book source, both collapsible (<details>). */
.study-panel { display: grid; gap: 10px; margin-top: 24px; }
.study-item {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--surface);
}
.study-item summary {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 11px 14px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.study-item summary::-webkit-details-marker { display: none; }
.study-item summary:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: -3px; border-radius: 15px; }
.study-icon {
  display: grid;
  place-items: center;
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  font-size: .95rem;
}
.study-title { font-size: .86rem; font-weight: 800; }
.study-location { margin-inline-start: auto; color: var(--ink-soft); font-size: .8rem; font-weight: 700; white-space: nowrap; }
.study-chevron {
  flex: none;
  width: 9px;
  height: 9px;
  margin-inline-start: 4px;
  border: solid currentColor;
  border-width: 0 2px 2px 0;
  color: var(--muted);
  transform: translateY(-2px) rotate(45deg);
  transition: transform .2s ease;
}
.study-hint .study-chevron { margin-inline-start: auto; }
.study-item[open] .study-chevron { transform: translateY(2px) rotate(-135deg); }
.study-content { margin: 0; padding: 0 16px 14px; padding-inline-start: 57px; }
p.study-content { color: var(--ink-soft); font-size: .9rem; line-height: 2; }

.study-hint { border-color: var(--amber-line); background: var(--amber-bg); }
.study-hint .study-icon { background: var(--amber-fill); }
.study-hint .study-title { color: var(--amber-ink); }

.study-source { border-color: var(--primary-line); background: var(--primary-bg-soft); }
.study-source .study-icon { background: var(--primary-bg); }
.study-source .study-title { color: var(--primary); }
.study-content > * + * { margin-top: 8px; }
.study-section { margin: 0; color: var(--ink-soft); font-size: .82rem; font-weight: 700; }
.study-secondary { margin: 0; color: var(--muted); font-size: .76rem; }
.study-content blockquote {
  margin: 8px 0 0;
  padding: 10px 13px;
  border-right: 3px solid var(--primary-line);
  border-radius: 10px;
  color: var(--ink-soft);
  background: var(--surface);
  font-size: .84rem;
  line-height: 1.95;
}
.study-source.is-tentative { border-style: dashed; border-color: var(--line-strong); background: var(--fill-soft); }
.study-source.is-tentative .study-title { color: var(--amber-ink); }
.study-source.is-tentative .study-icon { background: var(--amber-fill); }
.study-caution { margin: 0; color: var(--amber-ink); font-size: .76rem; }

@media (max-width: 530px) {
  .study-item summary { gap: 9px; padding: 10px 11px; }
  .study-icon { width: 28px; height: 28px; font-size: .85rem; }
  .study-location { font-size: .74rem; }
  .study-content { padding: 0 12px 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .study-chevron { transition: none; }
}

/* ---------- Results ---------- */
.tier-breakdown {
  display: grid; gap: 4px; margin: -6px 0 26px; padding: 16px 18px; border: 1px solid var(--line);
  border-radius: 16px; background: var(--surface); text-align: right;
}
.breakdown-row { display: grid; grid-template-columns: 86px minmax(0, 1fr) 72px; align-items: center; gap: 12px; padding: 5px 0; }
.breakdown-row strong { font-size: .84rem; text-align: left; }
.breakdown-bar { height: 8px; overflow: hidden; border-radius: 8px; background: var(--fill); }
.breakdown-bar i { display: block; height: 100%; border-radius: 8px; background: var(--tier); }
.results-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }

@media (max-width: 900px) {
  .tier-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .mode-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tier-grid { grid-template-columns: 1fr; gap: 8px; }
  .tier-card {
    display: grid; grid-template-columns: auto minmax(0, 1fr) auto; grid-template-areas: "chip title count" "hint hint hint";
    align-items: center; column-gap: 10px; row-gap: 3px; padding: 12px 16px 12px 46px;
  }
  .tier-card::before { inset: 0 0 0 auto; width: 4px; height: auto; }
  .tier-card .tier-chip { grid-area: chip; }
  .tier-card strong { grid-area: title; }
  .tier-hint { grid-area: hint; }
  .tier-count { grid-area: count; margin: 0; padding: 0; }
  .tier-check { top: 50%; transform: translateY(-50%); }
  .setup-footer { flex-direction: column; align-items: stretch; text-align: center; }
  .setup-footer .button-large { width: 100%; }
}

@media (max-width: 530px) {
  .setup-card { margin-top: 22px; padding: 22px 16px; border-radius: 22px; }
  .setup-hero .exam-facts { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .setup-hero .exam-facts > div { padding: 11px 6px; border-bottom: 0; }
  .setup-hero .exam-facts span { font-size: .68rem; }
  .mode-grid { grid-template-columns: 1fr; }
  .section-head { flex-direction: column; gap: 2px; }
  .count-option { flex: 1 0 calc(33% - 8px); min-width: 0; padding: 9px 6px; }
  .tier-badge span { display: none; }
  .breakdown-row { grid-template-columns: 76px minmax(0, 1fr) 64px; gap: 8px; }
}