:root {
  --bg: #f3efe7;
  --bg-soft: #fbf8f2;
  --panel: rgba(255, 252, 246, 0.88);
  --panel-strong: #fffdfa;
  --line: rgba(91, 104, 92, 0.16);
  --text: #24332a;
  --muted: #617064;
  --accent: #2f6f63;
  --accent-soft: rgba(47, 111, 99, 0.12);
  --warm: #9a6842;
  --danger: #a05045;
  --shadow: 0 18px 50px rgba(52, 65, 56, 0.08);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

.hidden {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(145, 173, 148, 0.14), transparent 30%),
    radial-gradient(circle at top right, rgba(191, 164, 124, 0.16), transparent 28%),
    linear-gradient(180deg, #f5f1ea 0%, #eeebe2 100%);
  color: var(--text);
}

button,
select {
  font: inherit;
}

.shell {
  max-width: 1480px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

.hero {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 20px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: linear-gradient(140deg, rgba(255, 251, 245, 0.96), rgba(247, 244, 237, 0.9));
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2 {
  margin: 0;
  font-family: "Source Han Serif SC", "Noto Serif SC", "STSong", serif;
  font-weight: 700;
}

h1 {
  font-size: clamp(2rem, 3vw, 3.5rem);
  line-height: 1.05;
}

.hero-copy {
  max-width: 780px;
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: #3c4a40;
}

.exam-switch {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 20px;
}

.exam-entry {
  border: 1px solid rgba(47, 111, 99, 0.16);
  border-radius: 999px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.66);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.exam-entry.active {
  background: var(--accent);
  color: #f7faf8;
  border-color: var(--accent);
}

.hero-note {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.hero-panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  align-self: center;
}

.metric {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.metric span {
  display: block;
  font-size: 13px;
  color: var(--muted);
}

.metric strong {
  display: block;
  margin-top: 10px;
  font-size: 1.4rem;
}

.layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 20px;
  margin-top: 22px;
}

.sidebar,
.workspace {
  display: grid;
  gap: 20px;
}

.panel,
.question-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.panel {
  padding: 22px;
}

.question-panel {
  padding: 26px;
}

.panel-head,
.question-topbar,
.question-head,
.action-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 14px;
}

.stats-grid article {
  padding: 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
}

.stats-grid span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.stats-grid strong {
  display: block;
  margin-top: 8px;
  font-size: 1.3rem;
}

.field {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.field span {
  color: var(--muted);
  font-size: 14px;
}

select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
}

.blueprint-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.blueprint-item {
  padding: 14px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--line);
}

.blueprint-item p,
.blueprint-item small {
  margin: 0;
}

.blueprint-item p {
  font-weight: 600;
}

.blueprint-item small {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  line-height: 1.6;
}

.panel-copy {
  margin: 14px 0 0;
  color: #455349;
  line-height: 1.75;
}

.compact-copy {
  margin-top: 10px;
  font-size: 14px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--accent);
  color: #f7faf8;
  font-size: 13px;
}

.badge.soft {
  background: var(--accent-soft);
  color: var(--accent);
}

.badge.warm {
  background: rgba(154, 104, 66, 0.12);
  color: var(--warm);
}

.subtle {
  margin: 0 0 10px;
  color: var(--muted);
}

.tag-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.tag {
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(97, 112, 100, 0.1);
  color: #435145;
  font-size: 13px;
}

.option-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.option-card {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.option-card:hover {
  transform: translateY(-1px);
  border-color: rgba(47, 111, 99, 0.3);
}

.option-card.selected {
  border-color: rgba(47, 111, 99, 0.55);
  background: rgba(47, 111, 99, 0.11);
}

.option-card.correct {
  border-color: rgba(47, 111, 99, 0.6);
  background: rgba(47, 111, 99, 0.14);
}

.option-card.wrong {
  border-color: rgba(160, 80, 69, 0.46);
  background: rgba(160, 80, 69, 0.1);
}

.option-letter {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(97, 112, 100, 0.12);
  font-weight: 700;
}

.option-text {
  align-self: center;
  line-height: 1.8;
}

.action-bar {
  margin-top: 22px;
}

.primary-button,
.ghost-button,
.text-button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.primary-button {
  background: var(--accent);
  color: #f8fcfb;
}

.ghost-button {
  background: rgba(97, 112, 100, 0.12);
  color: var(--text);
}

.text-button {
  padding: 0;
  background: transparent;
  color: var(--muted);
}

.report-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.report-hint {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.7;
  font-size: 14px;
}

.primary-button:hover,
.ghost-button:hover,
.text-button:hover {
  transform: translateY(-1px);
}

.analysis-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.answer-panel {
  min-height: 220px;
}

.answer-status {
  color: var(--muted);
  font-size: 14px;
}

.answer-reveal.hidden {
  display: none;
}

.answer-line {
  margin: 0;
  font-size: 1.1rem;
}

.analysis-text {
  margin: 14px 0 0;
  line-height: 1.9;
  color: #36453a;
}

.insight-card,
.advice-box {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--line);
  line-height: 1.8;
}

.insight-card span {
  display: block;
  color: var(--warm);
  font-size: 13px;
  margin-bottom: 6px;
}

.detail-list {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding-left: 18px;
  line-height: 1.8;
}

.detail-list.compact {
  margin-top: 10px;
  gap: 8px;
}

.report-panel {
  display: grid;
  gap: 16px;
}

.report-empty {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.55);
  border: 1px dashed var(--line);
  color: var(--muted);
  line-height: 1.8;
}

.report-content.hidden {
  display: none;
}

.report-content {
  display: grid;
  gap: 16px;
}

.report-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.report-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--line);
}

.report-card h3 {
  margin: 0;
  font-size: 1rem;
  font-family: "Source Han Serif SC", "Noto Serif SC", "STSong", serif;
}

.report-prose {
  margin-top: 10px;
  line-height: 1.9;
  color: #334239;
}

@media (max-width: 1100px) {
  .hero,
  .layout,
  .analysis-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .report-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    padding: 14px 12px 28px;
  }

  .hero,
  .panel,
  .question-panel {
    padding: 18px;
  }

  .hero-panel,
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .exam-switch {
    grid-template-columns: 1fr;
  }

  .report-actions {
    grid-template-columns: 1fr;
  }

  .question-topbar,
  .question-head,
  .action-bar,
  .panel-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .tag-wrap {
    justify-content: flex-start;
  }
}