:root {
  --bg: #f6f7f8;
  --panel: #ffffff;
  --text: #1d252c;
  --muted: #6b747d;
  --line: #d8dde2;
  --strong-line: #aeb7c0;
  --accent: #146c5d;
  --accent-dark: #0d5146;
  --bad: #b3261e;
  --good: #126c38;
  --warn: #8a5a00;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  border-color: var(--strong-line);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.danger {
  border-color: #dfb4b0;
  color: var(--bad);
}

.danger:hover {
  border-color: var(--bad);
  background: #fff7f6;
}

.small {
  padding: 7px 10px;
  font-size: 13px;
}

.app {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 20px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  font-weight: 700;
}

h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

#subtitle {
  color: var(--muted);
  margin-top: 6px;
}

.today-box {
  min-width: 90px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  text-align: center;
}

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

.today-box strong {
  font-size: 24px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  overflow-x: auto;
}

.tab.active {
  background: #e9f3f0;
  border-color: #9bc7bd;
  color: var(--accent-dark);
  font-weight: 700;
}

.view {
  display: none;
}

.active-view {
  display: block;
}

.practice-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 16px;
}

.side-panel,
.practice-card,
.library-list,
.add-form,
.import-layout,
.stats-grid {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.side-panel {
  padding: 16px;
  height: fit-content;
}

.side-panel label {
  display: block;
  color: var(--muted);
  margin-bottom: 14px;
}

select,
input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  padding: 10px 12px;
  outline: none;
}

select:focus,
input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(20, 108, 93, 0.12);
}

.mini-stats {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.scope-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
  padding: 10px 12px;
  margin-bottom: 14px;
}

.scope-box span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 5px;
}

.scope-box strong {
  display: block;
  font-size: 14px;
  line-height: 1.5;
  font-weight: 500;
}

.custom-goal {
  margin-top: -4px;
}

.mini-stats div,
.stats-grid div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
}

.mini-stats span,
.stats-grid span {
  color: var(--muted);
}

.practice-card {
  min-height: 520px;
  padding: 24px;
}

.prompt-head {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  margin-bottom: 24px;
}

.prompt-label,
.answer-label {
  display: block;
  color: var(--muted);
  margin-bottom: 8px;
}

.prompt-text {
  font-size: 28px;
  line-height: 1.45;
  margin-bottom: 28px;
}

.lined-input {
  min-height: 140px;
  resize: none;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  padding: 6px 0;
  font-size: 24px;
  line-height: 42px;
  background:
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent 40px,
      var(--strong-line) 41px,
      transparent 42px
    );
  box-shadow: none;
}

.lined-input:focus {
  border: 0;
  box-shadow: none;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.feedback {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  line-height: 1.7;
  background: #fbfcfc;
}

.feedback.good {
  border-color: #9bd4b4;
  color: var(--good);
}

.feedback.warn {
  border-color: #d5bb72;
  color: var(--warn);
}

.feedback.bad {
  border-color: #e0a19d;
  color: var(--bad);
}

.toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.add-form {
  display: grid;
  grid-template-columns: 1fr 1fr 150px 220px auto;
  gap: 10px;
  padding: 12px;
  margin-bottom: 12px;
}

.library-list {
  overflow: hidden;
}

.item-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 90px 170px;
  gap: 12px;
  padding: 12px;
  border-bottom: 1px solid var(--line);
}

.item-row > * {
  min-width: 0;
}

.item-row strong,
.item-row div {
  overflow-wrap: anywhere;
}

.item-row.with-actions {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 90px 170px 70px;
}

.item-row:last-child {
  border-bottom: 0;
}

.item-row .muted {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.tag-list {
  color: var(--muted);
  font-size: 13px;
}

.row-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  align-items: flex-start;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(29, 37, 44, 0.38);
  padding: 20px;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-card {
  width: min(620px, 100%);
  max-height: calc(100vh - 40px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

.modal-card label {
  display: block;
  color: var(--muted);
  margin-bottom: 12px;
}

.modal-card input,
.modal-card textarea {
  margin-top: 6px;
}

.modal-actions {
  justify-content: flex-end;
}

.import-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 16px;
}

.import-layout p {
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.import-box {
  min-height: 260px;
  resize: vertical;
  font-family: Consolas, "Microsoft YaHei", monospace;
}

.summary {
  color: var(--muted);
  margin-bottom: 12px;
}

.wrongbook-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.wrongbook-list {
  display: grid;
  gap: 12px;
}

.wrong-card,
.empty-state {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.wrong-main {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 14px;
}

.wrong-label {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 5px;
}

.wrong-main strong,
.wrong-main p,
.wrong-answer,
.wrong-hint {
  overflow-wrap: anywhere;
}

.wrong-main strong {
  display: block;
  font-size: 18px;
  line-height: 1.5;
}

.wrong-main p {
  line-height: 1.5;
}

.wrong-answer {
  color: var(--bad);
}

.wrong-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.wrong-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  padding: 4px 9px;
}

.wrong-hint {
  color: var(--bad);
  margin-top: 12px;
  line-height: 1.6;
}

.wrong-history-list {
  margin-top: 10px;
}

.wrong-history {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  padding: 4px 0;
}

.wrong-history strong {
  color: var(--text);
  font-weight: 400;
  overflow-wrap: anywhere;
}

.wrong-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.preview-list {
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.preview-list .item-row {
  grid-template-columns: 1fr;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 12px 18px;
  margin-bottom: 16px;
}

.stats-grid div {
  display: block;
  border-right: 1px solid var(--line);
  padding: 8px 16px;
}

.stats-grid div:last-child {
  border-right: 0;
}

.stats-grid strong {
  display: block;
  font-size: 28px;
  margin-top: 8px;
}

@media (max-width: 820px) {
  .app {
    padding: 14px;
  }

  .topbar {
    align-items: flex-start;
  }

  h1 {
    font-size: 22px;
  }

  .practice-shell,
  .import-layout {
    grid-template-columns: 1fr;
  }

  .side-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .mini-stats {
    grid-column: 1 / -1;
  }

  .scope-box {
    grid-column: 1 / -1;
  }

  .practice-card {
    padding: 18px;
    min-height: 460px;
  }

  .prompt-text {
    font-size: 23px;
  }

  .lined-input {
    font-size: 21px;
  }

  .add-form,
  .item-row,
  .item-row.with-actions,
  .wrong-main,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .wrongbook-head {
    display: block;
  }

  .wrongbook-head .primary {
    width: 100%;
    margin-top: 10px;
  }

  .wrong-history {
    grid-template-columns: 1fr;
  }

  .wrong-actions button {
    flex: 1 1 140px;
  }

  .item-row {
    gap: 8px;
    padding: 14px;
  }

  .item-row strong {
    display: block;
    font-size: 18px;
    line-height: 1.45;
  }

  .row-actions {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .row-actions .small {
    flex: 1 1 120px;
  }

  .stats-grid div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .stats-grid div:last-child {
    border-bottom: 0;
  }
}