:root {
  color-scheme: light;
  --bg: #f4efff;
  --panel: rgba(255, 255, 255, .9);
  --panel-solid: #ffffff;
  --panel-2: #f4efff;
  --text: #2f2845;
  --muted: #746b8a;
  --border: #ddd3f3;
  --primary: #7c5cc9;
  --primary-2: #6848b5;
  --primary-soft: #ece5ff;
  --correct: #18864a;
  --correct-soft: #e6f7ed;
  --wrong: #ca3f58;
  --wrong-soft: #fff0f2;
  --warn: #b56d00;
  --warn-soft: #fff5d9;
  --shadow: 0 18px 45px rgba(94, 65, 155, .13);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(190, 164, 255, .38), transparent 32rem),
    radial-gradient(circle at 90% 12%, rgba(255, 220, 246, .55), transparent 30rem),
    linear-gradient(135deg, #fbf9ff 0%, var(--bg) 48%, #eee6ff 100%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
button, input { font: inherit; }
button { cursor: pointer; border: 0; border-radius: 10px; }
.app-header {
  max-width: 1280px;
  margin: 0 auto;
  padding: 36px 24px 20px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}
.eyebrow {
  margin: 0 0 6px;
  color: var(--primary);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: .14em;
  font-weight: 850;
}
h1, h2, h3 { margin: 0; line-height: 1.2; }
h1 { font-size: clamp(30px, 4vw, 46px); letter-spacing: -.04em; color: #2b2147; }
.subtitle, p { color: var(--muted); }
.header-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(90px, 1fr));
  gap: 10px;
  min-width: 330px;
}
.stat-card {
  background: rgba(255, 255, 255, .78);
  border: 1px solid rgba(221, 211, 243, .9);
  border-radius: 16px;
  padding: 12px;
  text-align: center;
  box-shadow: 0 8px 24px rgba(94, 65, 155, .08);
}
.stat-card b { display: block; font-size: 22px; color: var(--primary-2); }
.stat-card span { color: var(--muted); font-size: 12px; }
main { max-width: 1280px; margin: 0 auto; padding: 0 24px 48px; }
.view { display: none; }
.view.active { display: block; }
.gate-view {
  min-height: 62vh;
  place-items: center;
}
.gate-view.active { display: grid; }
.gate-card {
  width: min(520px, 100%);
  padding: 30px;
}
.access-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  margin-top: 20px;
}
.access-error {
  margin: 12px 0 0;
  color: var(--wrong);
  font-weight: 750;
}
.request-box {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.request-box h3 { margin: 0 0 8px; }
.request-box p { margin: 0 0 12px; }
.request-form { display: grid; gap: 10px; }
.request-form textarea,
.request-form input[type="text"] {
  width: 100%;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  resize: vertical;
}
.request-form textarea:focus,
.request-form input[type="text"]:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(124, 92, 201, .14); }
.request-message { color: var(--primary-2); font-weight: 750; line-height: 1.5; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}
.intro-panel {
  padding: 24px;
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: stretch;
}
.mode-box {
  width: 280px;
  background: linear-gradient(180deg, #faf7ff, #f1e9ff);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
}
.mode-box label { display: block; font-weight: 800; margin-bottom: 8px; }
.mode-box small { display: block; margin-top: 8px; color: var(--muted); line-height: 1.45; }
.mode-time { font-size: 28px; font-weight: 950; color: var(--primary-2); }
input[type="number"], input[type="search"] {
  width: 100%;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(124, 92, 201, .14); }
.toolbar { display: grid; grid-template-columns: 1fr auto auto; gap: 12px; margin: 18px 0; }
.test-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.test-card {
  padding: 18px;
  min-height: 190px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.test-card:hover { transform: translateY(-3px); border-color: var(--primary); box-shadow: 0 18px 38px rgba(94, 65, 155, .2); }
.test-card h3 { font-size: 20px; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--border);
  background: #faf7ff;
  color: var(--muted);
  padding: 4px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 650;
}
.badge.warn { color: #915800; border-color: #efd38a; background: var(--warn-soft); }
.card-actions { display: flex; gap: 10px; }
.primary, .secondary, .ghost { padding: 10px 14px; font-weight: 800; }
.primary { color: white; background: linear-gradient(180deg, #8d69df, #6848b5); box-shadow: 0 8px 18px rgba(104, 72, 181, .24); }
.primary:hover { background: linear-gradient(180deg, #815bd2, #5d3fa7); }
.secondary { color: var(--text); background: #eadff9; }
.secondary:hover { background: #dfd0f4; }
.ghost { color: var(--primary-2); background: transparent; border: 1px solid #cbb9ea; }
.ghost:hover { background: var(--primary-soft); }
.exam-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 18px;
  align-items: center;
  padding: 14px 18px;
  background: rgba(255,255,255,.88);
}
.exam-title-wrap p { margin: 4px 0 0; }
.timer-wrap { text-align: right; }
.timer {
  font-variant-numeric: tabular-nums;
  font-size: 31px;
  line-height: 1;
  font-weight: 950;
  color: var(--primary-2);
}
.section-timer { margin-top: 5px; color: var(--muted); font-size: 12px; }
.section-tabs {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.section-tab {
  min-width: 150px;
  color: var(--muted);
  background: rgba(255,255,255,.8);
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  font-weight: 850;
}
.section-tab small { display: block; margin-top: 4px; color: var(--muted); font-weight: 500; }
.section-tab.active { color: var(--primary-2); border-color: var(--primary); background: var(--primary-soft); }
.section-tab.submitted { opacity: .72; }
.exam-layout {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 18px;
  margin-top: 18px;
}
.exam-layout-v2 { grid-template-columns: 240px minmax(0, 1fr); }
.navigator {
  padding: 18px;
  height: calc(100vh - 170px);
  position: sticky;
  top: 145px;
  overflow: auto;
}
.progress-line { margin: 10px 0; color: var(--muted); }
.progress-bar { height: 8px; background: #e6ddf3; border-radius: 999px; overflow: hidden; }
.progress-bar div { height: 100%; width: 0; background: var(--primary); transition: width .2s; }
.section-nav { margin-top: 16px; }
.section-nav h4 { margin: 0 0 8px; color: var(--primary-2); }
.nav-buttons { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.nav-buttons button {
  min-width: 0;
  padding: 7px 0;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px;
}
.nav-buttons button.answered { color: white; background: var(--primary-2); border-color: var(--primary); }
.nav-buttons button.current { outline: 2px solid #d7b5ff; }
.nav-buttons button.missing { text-decoration: line-through; opacity: .55; }
.questions-area { display: grid; gap: 18px; }
.split-exam {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, .95fr);
  min-height: calc(100vh - 170px);
  overflow: hidden;
}
.pane {
  min-width: 0;
  max-height: calc(100vh - 170px);
  overflow: auto;
  padding: 24px;
}
.passage-pane { border-right: 1px solid var(--border); background: #fbf9ff; }
.question-pane { background: rgba(255,255,255,.94); }
.pane-label {
  color: var(--primary-2);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.section-block { padding: 22px; }
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}
.question-card {
  padding: 18px 0;
  border-bottom: 1px dashed var(--border);
}
.question-card:last-child { border-bottom: 0; }
.question-head { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.qnum { font-size: 20px; font-weight: 950; color: var(--primary-2); }
.type-chip {
  color: var(--primary-2);
  border: 1px solid #cbb9ea;
  background: var(--primary-soft);
  border-radius: 999px;
  padding: 3px 8px;
  font-size: 12px;
  font-weight: 850;
}
.passage, .stimulus, .question-text {
  color: #3a324f;
  line-height: 1.78;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.exam-passage, .exam-stimulus { font-size: 17px; line-height: 1.92; }
.exam-question { font-size: 18px; line-height: 1.75; }
.passage {
  background: #fff;
  border-left: 4px solid var(--primary);
  padding: 14px 16px;
  margin: 12px 0;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(94,65,155,.07);
}
.stimulus { margin: 8px 0; }
.question-text { font-weight: 750; margin: 12px 0; color: #2f2845; }
.choices { display: grid; gap: 8px; margin-top: 12px; }
.exam-choices { gap: 10px; }
.choice {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  align-items: start;
  padding: 11px 12px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 12px;
  transition: border-color .15s, background .15s, box-shadow .15s;
}
.choice:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(94,65,155,.1); }
.choice.selected { border-color: var(--primary); background: var(--primary-soft); }
.choice.correct { border-color: rgba(24,134,74,.45); background: var(--correct-soft); }
.choice.wrong { border-color: rgba(202,63,88,.45); background: var(--wrong-soft); }
.choice .label {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #efe8fb;
  color: var(--primary-2);
  font-weight: 900;
}
.choice.selected .label { background: var(--primary-2); color: white; }
.choice.correct .label { background: var(--correct); color: white; }
.choice.wrong .label { background: var(--wrong); color: white; }
.choice input { margin-top: 6px; accent-color: var(--primary-2); }
.answer-note, .missing-note, .uncertainty-note {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  line-height: 1.55;
}
.answer-note { background: var(--correct-soft); border: 1px solid rgba(24,134,74,.28); }
.missing-note { background: var(--warn-soft); border: 1px solid #efd38a; color: #8c5700; }
.uncertainty-note { background: var(--primary-soft); border: 1px solid #cbb9ea; }
.missing-note.large { font-size: 17px; line-height: 1.8; }
.question-controls {
  position: sticky;
  bottom: 16px;
  z-index: 20;
  margin-top: 18px;
  padding: 12px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  background: rgba(255,255,255,.88);
}
.question-controls button:last-child { justify-self: end; }
.result-hero {
  padding: 24px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
}
.score { font-size: 44px; font-weight: 950; color: var(--correct); }
#typeBreakdown { margin: 18px 0; padding: 20px; }
.breakdown-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-top: 14px; }
.breakdown-item { background: #faf7ff; border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.review-toolbar { display: flex; gap: 10px; margin: 18px 0; flex-wrap: wrap; }
.review-toolbar button.active { background: var(--primary-2); color: white; }
.review-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, .9fr); gap: 20px; }
.review-left { border-right: 1px solid var(--border); padding-right: 18px; }
.review-right { min-width: 0; }
.hidden { display: none !important; }
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: rgba(66, 50, 103, .34);
  padding: 20px;
}
.modal-card {
  width: min(460px, 100%);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
}
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
@media (max-width: 1000px) {
  .exam-layout-v2 { grid-template-columns: 1fr; }
  .navigator { position: relative; top: 0; height: auto; max-height: 280px; }
  .split-exam { grid-template-columns: 1fr; min-height: 0; }
  .pane { max-height: none; padding: 18px; }
  .passage-pane { border-right: 0; border-bottom: 1px solid var(--border); }
  .review-split { grid-template-columns: 1fr; }
  .review-left { border-right: 0; border-bottom: 1px solid var(--border); padding-right: 0; padding-bottom: 16px; }
}
@media (max-width: 900px) {
  .app-header, .intro-panel, .result-hero { display: block; }
  .header-stats { margin-top: 18px; min-width: 0; }
  .mode-box { width: 100%; margin-top: 18px; }
  .toolbar { grid-template-columns: 1fr; }
  .exam-topbar { grid-template-columns: 1fr; }
  .timer-wrap { text-align: left; }
  .question-controls { grid-template-columns: 1fr; }
  .question-controls button:last-child { justify-self: stretch; }
  .score { margin-top: 14px; }
}