:root {
  --bg-top: #edf0e7;
  --bg-mid: #dce7de;
  --bg-bottom: #d3ddd7;
  --paper: rgba(255, 252, 245, 0.86);
  --paper-strong: #fffdf7;
  --line: rgba(27, 62, 53, 0.15);
  --line-strong: rgba(27, 62, 53, 0.24);
  --ink: #18342d;
  --muted: #5a766f;
  --accent: #aa6d45;
  --accent-soft: #fae1d0;
  --success: #2f7a5d;
  --success-soft: #d8efe3;
  --danger: #a45743;
  --danger-soft: #f8ddd6;
  --hero-a: rgba(255, 251, 245, 0.88);
  --hero-b: rgba(238, 246, 238, 0.84);
  --surface-soft: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.86);
  --shadow: 0 18px 40px rgba(31, 63, 56, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.92), transparent 38%),
    radial-gradient(circle at bottom right, rgba(170, 109, 69, 0.1), transparent 44%),
    linear-gradient(140deg, var(--bg-top), var(--bg-mid) 55%, var(--bg-bottom));
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
}

h1,
h2 {
  margin: 0;
  font-family: "Songti SC", "STZhongsong", "Noto Serif CJK SC", serif;
}

button,
input,
select {
  font: inherit;
}

input,
select {
  width: 100%;
  min-height: 46px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--ink);
}

select[multiple] {
  min-height: 112px;
  padding: 6px 8px;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 2px solid rgba(170, 109, 69, 0.34);
  outline-offset: 1px;
}

.app-shell {
  width: min(1280px, calc(100% - 34px));
  margin: 0 auto;
  padding: 20px 0 30px;
  animation: rise-in 420ms ease both;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  margin-bottom: 12px;
  align-items: center;
}

.hero,
.card {
  position: relative;
}

.card {
  overflow: hidden;
}

.hero::after,
.card::after {
  content: "";
  position: absolute;
  inset: auto -46px -62px auto;
  width: 154px;
  height: 154px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(170, 109, 69, 0.12), transparent 68%);
  pointer-events: none;
}

.hero::after {
  opacity: 0.45;
}

.hero > div,
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.hero > div {
  border-color: rgba(27, 62, 53, 0.18);
  background: linear-gradient(136deg, var(--hero-a), var(--hero-b));
  box-shadow: 0 12px 28px rgba(31, 63, 56, 0.1);
  overflow: hidden;
  background-clip: padding-box;
}

.hero-title-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 16px;
  min-height: 64px;
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.78rem;
  white-space: nowrap;
}

h1 {
  font-size: clamp(1.2rem, 2vw, 1.8rem);
  line-height: 1.2;
  white-space: nowrap;
  color: var(--ink);
}

.studio-name {
  margin: -2px 0 0;
  width: 100%;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.hero-copy {
  max-width: 620px;
  margin: 10px 0 0;
  line-height: 1.62;
  font-size: 0.96rem;
  color: var(--muted);
}

.hero-panel {
  display: flex;
  gap: 8px;
  padding: 8px;
  align-items: stretch;
  background: linear-gradient(136deg, rgba(255, 251, 245, 0.66), rgba(238, 246, 238, 0.64));
  color: var(--ink);
}

.hero-stat {
  padding: 9px 12px;
  min-width: 112px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-strong);
}

.hero-stat span {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--muted);
  opacity: 1;
}

.hero-stat strong {
  display: block;
  margin-top: 4px;
  font-size: 1.42rem;
  line-height: 1;
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.62fr) minmax(308px, 0.9fr);
  gap: 16px;
}

.main-column,
.side-column {
  display: grid;
  gap: 14px;
  align-content: start;
}

.section-title-tools {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  min-width: 0;
}

.dashboard-card .section-title-tools span {
  white-space: nowrap;
}

.section-collapse-toggle {
  min-height: 30px;
  padding: 0 10px;
  font-size: 0.8rem;
}

.dashboard-card.collapsed > :not(.section-title) {
  display: none;
}

.dashboard-card.collapsed .section-title {
  margin-bottom: 0;
}

.card {
  padding: 16px;
}

.controls {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 10px;
  align-items: end;
}

.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: -4px;
}

.active-filters-empty {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.filter-chip,
.filter-clear-all {
  min-height: 32px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--ink);
  padding: 0 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
}

.filter-chip strong {
  color: var(--accent);
  font-size: 0.9rem;
}

.filter-clear-all {
  border-color: rgba(164, 87, 67, 0.24);
  color: var(--danger);
}

.control-group {
  display: grid;
  gap: 8px;
  grid-column: span 3;
}

.control-group label {
  font-size: 0.88rem;
  color: var(--muted);
}

.compact-subject-group {
  grid-column: span 2;
}

.compact-subject-group label {
  font-size: 0.82rem;
}

.compact-subject-group select {
  min-height: 40px;
  padding: 8px 10px;
}

.ghost-button,
.primary-button,
.secondary-button,
.danger-button {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

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

.ghost-button {
  border-color: var(--line);
  background: var(--surface-soft);
  color: var(--ink);
}

.admin-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.controls > button,
.controls > a {
  grid-column: span 4;
}

.secondary-button {
  border-color: var(--line-strong);
  background: var(--paper-strong);
  color: var(--ink);
}

.primary-button {
  background: linear-gradient(135deg, #2a6f5a, #3b8369);
  color: #f8fbf8;
  box-shadow: 0 10px 22px rgba(42, 111, 90, 0.2);
}

.danger-button {
  border-color: rgba(164, 87, 67, 0.3);
  background: rgba(248, 221, 214, 0.72);
  color: var(--danger);
}

.ghost-button:disabled,
.primary-button:disabled,
.secondary-button:disabled,
.danger-button:disabled {
  opacity: 0.48;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.stat-chip {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.stat-chip span {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
}

.stat-chip strong {
  display: block;
  margin-top: 6px;
  font-size: 1.35rem;
}

.section-title {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 10px;
}

.section-title-tight {
  margin-bottom: 10px;
}

.section-title span {
  color: var(--muted);
  font-size: 0.92rem;
}

.mock-board {
  background:
    linear-gradient(130deg, rgba(255, 252, 247, 0.84), rgba(239, 247, 241, 0.76)),
    var(--paper);
}

.mock-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.mock-item {
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.mock-item span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}

.mock-item strong {
  display: block;
  margin-top: 4px;
  font-size: 1.15rem;
}

.progress-track {
  margin: 10px 0 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(47, 122, 93, 0.14);
  overflow: hidden;
}

.progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #3b8369, #aa6d45);
  transition: width 220ms ease;
}

.mock-report {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.mock-report-title {
  margin: 0 0 8px;
  color: var(--ink);
  font-weight: 700;
}

.mock-report-grid {
  display: grid;
  gap: 8px;
}

.mock-report-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px 10px;
  background: var(--surface-soft);
}

.mock-report-item strong {
  display: block;
  font-size: 0.88rem;
  color: var(--ink);
}

.mock-report-item p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.question-card {
  min-height: 520px;
}

.question-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.question-progress {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 700;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 14px;
}

.badge {
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(170, 109, 69, 0.12);
  color: var(--accent);
  font-size: 0.9rem;
}

.question-stem {
  margin: 0 0 14px;
  line-height: 1.66;
  font-size: 1.02rem;
}

.keyword-mark {
  background: rgba(170, 109, 69, 0.22);
  color: inherit;
  border-radius: 5px;
  padding: 0 3px;
}

.options {
  display: grid;
  gap: 8px;
}

.option {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-soft);
  text-align: left;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.option:hover {
  transform: translateY(-1px);
  border-color: rgba(47, 122, 93, 0.3);
}

.option.selected {
  border-color: rgba(42, 111, 90, 0.36);
  background: rgba(232, 245, 238, 0.9);
}

.option.correct {
  border-color: rgba(47, 122, 93, 0.35);
  background: var(--success-soft);
}

.option.incorrect {
  border-color: rgba(164, 87, 67, 0.32);
  background: var(--danger-soft);
}

.option-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(24, 52, 45, 0.08);
  font-weight: 700;
  flex: 0 0 auto;
}

.option-copy {
  line-height: 1.7;
}

.action-row {
  display: flex;
  gap: 12px;
  margin-top: 14px;
}

.shortcut-tip {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.feedback-panel {
  margin-top: 14px;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.feedback-panel.correct {
  border-color: rgba(47, 122, 93, 0.26);
  background: var(--success-soft);
}

.feedback-panel.incorrect {
  border-color: rgba(164, 87, 67, 0.24);
  background: var(--danger-soft);
}

.feedback-title {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 700;
}

.feedback-text,
.feedback-answer,
.feedback-placeholder {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

.feedback-answer {
  margin-top: 8px;
  font-weight: 700;
  color: var(--ink);
}

.wrong-reason-block {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

.wrong-reason-label {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.88rem;
}

.wrong-reason-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.wrong-reason-chip {
  min-height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  font-size: 0.82rem;
  cursor: pointer;
}

.wrong-reason-chip.selected {
  border-color: rgba(164, 87, 67, 0.4);
  background: rgba(248, 221, 214, 0.9);
  color: #6f2f23;
}

.overview-list,
.list-panel {
  display: grid;
  gap: 8px;
}

.overview-item,
.list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.overview-item strong,
.list-item strong {
  font-size: 1.03rem;
}

.overview-item span,
.list-item span {
  color: var(--muted);
  font-size: 0.9rem;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}

.palette-pager {
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.palette-page-button {
  min-height: 30px;
  padding: 0 10px;
  font-size: 0.82rem;
}

.palette-page-info {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  white-space: nowrap;
}

.palette-button {
  min-height: 32px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--ink);
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.palette-button:hover {
  transform: translateY(-1px);
}

.palette-button.current {
  border-color: rgba(170, 109, 69, 0.34);
  background: var(--accent-soft);
}

.palette-button.done-correct {
  border-color: rgba(47, 122, 93, 0.3);
  background: rgba(216, 239, 227, 0.9);
}

.palette-button.done-wrong {
  border-color: rgba(164, 87, 67, 0.3);
  background: rgba(248, 221, 214, 0.9);
}

.palette-empty {
  margin: 0;
  color: var(--muted);
}

.target-row {
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
}

.target-row label {
  color: var(--muted);
  font-size: 0.94rem;
}

.target-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.data-actions {
  display: grid;
  gap: 8px;
}

.file-label {
  display: grid;
  place-items: center;
  min-height: 40px;
  border-radius: 999px;
  border: 1px dashed var(--line-strong);
  background: var(--surface-soft);
  color: var(--ink);
  cursor: pointer;
  padding: 0 14px;
}

.file-label input {
  display: none;
}

.data-message {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.9rem;
}

.data-message.success {
  color: var(--success);
}

.data-message.error {
  color: var(--danger);
}

.studio-credit {
  margin: 10px 0 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.changelog-row {
  margin: 10px 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: 0.84rem;
}

.changelog-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.changelog-link:hover {
  text-decoration: underline;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 380px;
  text-align: center;
}

.empty-state h2 {
  margin-bottom: 10px;
}

.hidden {
  display: none !important;
}

.mobile-tab-bar {
  display: none;
}

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

  .controls {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .control-group {
    grid-column: span 3;
  }

  .compact-subject-group {
    grid-column: span 3;
  }

  .controls > button,
  .controls > a {
    grid-column: span 2;
  }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .hero-title-row {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  h1 {
    white-space: normal;
  }

  .hero-panel {
    flex-wrap: wrap;
  }

  .controls,
  .stats-grid,
  .mock-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .control-group {
    grid-column: span 1;
  }

  .compact-subject-group {
    grid-column: span 1;
  }

  .controls > button,
  .controls > a {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  body {
    background:
      radial-gradient(circle at top center, rgba(255, 255, 255, 0.96), transparent 42%),
      linear-gradient(180deg, #f2f3f7 0%, #edf0f5 100%);
  }

  .app-shell {
    width: min(100%, 430px);
    padding: calc(env(safe-area-inset-top) + 10px) 10px calc(env(safe-area-inset-bottom) + 126px);
    animation: none;
    transform: none;
  }

  .hero {
    position: static;
    top: auto;
    z-index: auto;
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 10px;
  }

  .hero::after {
    display: none;
  }

  .hero > div {
    border-radius: 22px;
    border-color: rgba(35, 52, 78, 0.1);
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(18px);
    box-shadow: 0 8px 20px rgba(42, 56, 84, 0.1);
  }

  .hero-title-row {
    min-height: auto;
    padding: 10px 12px;
    align-items: center;
  }

  .eyebrow {
    display: none;
  }

  h1 {
    font-size: 1.06rem;
    line-height: 1.2;
  }

  .hero-panel {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    padding: 8px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .hero-panel::-webkit-scrollbar {
    display: none;
  }

  .hero-stat {
    min-width: 110px;
    padding: 8px 10px;
    border-radius: 14px;
  }

  .hero-stat strong {
    font-size: 1.2rem;
  }

  .layout {
    gap: 10px;
  }

  .card {
    border-radius: 22px;
    padding: 12px;
    border-color: rgba(35, 52, 78, 0.1);
    background: rgba(255, 255, 255, 0.82);
    box-shadow: 0 6px 18px rgba(42, 56, 84, 0.08);
  }

  .controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .control-group {
    grid-column: span 1;
    gap: 5px;
  }

  .control-group label {
    font-size: 0.78rem;
  }

  .controls > button,
  .controls > a {
    grid-column: span 1;
    min-height: 38px;
  }

  .stats-grid,
  .mock-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .stat-chip,
  .mock-item {
    border-radius: 14px;
    padding: 10px;
  }

  .question-card {
    min-height: auto;
  }

  .question-head,
  .section-title,
  .overview-item,
  .list-item {
    display: grid;
  }

  .question-stem {
    margin-bottom: 10px;
    font-size: 0.98rem;
  }

  .options {
    gap: 10px;
  }

  .option {
    border-radius: 16px;
    padding: 12px;
  }

  .action-row {
    position: sticky;
    bottom: calc(env(safe-area-inset-bottom) + 72px);
    z-index: 20;
    margin-top: 12px;
    padding: 8px;
    border: 1px solid rgba(35, 52, 78, 0.1);
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.84);
    backdrop-filter: blur(16px);
    gap: 8px;
    flex-direction: row;
  }

  .action-row button {
    flex: 1;
    min-width: 0;
    min-height: 40px;
    padding: 0 8px;
    font-size: 0.84rem;
  }

  .palette-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .palette-pager {
    flex-wrap: wrap;
  }

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

  .mobile-tab-bar {
    position: fixed;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    bottom: calc(env(safe-area-inset-bottom) + 8px);
    z-index: 30;
    width: min(calc(100% - 20px), 420px);
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 4px;
    padding: 6px;
    border-radius: 20px;
    border: 1px solid rgba(35, 52, 78, 0.12);
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    box-shadow: 0 10px 28px rgba(34, 53, 84, 0.18);
  }

  .mobile-tab {
    min-height: 46px;
    border-radius: 14px;
    border: 1px solid transparent;
    background: transparent;
    color: #57606a;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    position: relative;
  }

  .mobile-tab-icon {
    width: 17px;
    height: 17px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .mobile-tab-label {
    font-size: 0.68rem;
    line-height: 1;
    font-weight: 500;
  }

  .mobile-tab.active {
    color: #0969da;
    background: linear-gradient(180deg, rgba(231, 241, 253, 0.96), rgba(220, 236, 252, 0.92));
    border-color: rgba(9, 105, 218, 0.2);
  }

  .mobile-tab.active .mobile-tab-label {
    font-weight: 600;
  }
}