:root {
  --logic-bg: #f6f3ec;
  --logic-surface: #ffffff;
  --logic-surface-strong: #fff8e8;
  --logic-ink: #20242a;
  --logic-muted: #647067;
  --logic-border: #ddd6c8;
  --logic-teal: #1b7f72;
  --logic-teal-dark: #0f5f56;
  --logic-amber: #d8892b;
  --logic-red: #b34432;
  --logic-shadow: 0 16px 36px rgba(38, 44, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body.logic-practice-page {
  margin: 0;
  min-height: 100vh;
  color: var(--logic-ink);
  background:
    linear-gradient(180deg, rgba(255, 248, 232, 0.78), rgba(246, 243, 236, 0.96) 38%),
    var(--logic-bg);
  font-family: "Inter", "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

.logic-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.logic-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 24px;
  align-items: stretch;
  margin-bottom: 24px;
}

.logic-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 5vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.logic-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--logic-muted);
  font-size: 1.08rem;
  line-height: 1.8;
}

.logic-kicker,
.logic-step-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  color: var(--logic-teal-dark);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
}

.logic-quota-note,
.logic-card {
  border: 1px solid var(--logic-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--logic-shadow);
}

.logic-quota-note {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 22px;
  border-left: 5px solid var(--logic-teal);
}

.logic-quota-note strong {
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.logic-quota-note span {
  color: var(--logic-muted);
  line-height: 1.65;
}

.logic-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: 22px;
  align-items: start;
}

.logic-left,
.logic-right {
  display: grid;
  gap: 18px;
}

.logic-card {
  padding: 22px;
}

.logic-card h2,
.logic-topic-head h2,
.logic-result-head h2 {
  margin: 0 0 14px;
  font-size: 1.35rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.logic-card h3 {
  margin: 0 0 8px;
  color: #25312d;
  font-size: 1rem;
  line-height: 1.35;
}

.logic-card p {
  margin: 0;
  color: var(--logic-muted);
  line-height: 1.75;
}

.logic-reason-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.logic-reason-list article,
.logic-example article,
.logic-result-grid article {
  min-width: 0;
  padding: 14px;
  border: 1px solid #ebe3d2;
  border-radius: 8px;
  background: #fffdf7;
}

.logic-example {
  display: grid;
  gap: 12px;
}

.logic-example-question {
  border-left: 4px solid var(--logic-amber);
}

.logic-select-label {
  display: block;
  margin-bottom: 8px;
  color: var(--logic-muted);
  font-weight: 700;
}

#logicCategorySelect,
#logicChainInput {
  width: 100%;
  border: 1px solid var(--logic-border);
  border-radius: 8px;
  background: #fffefb;
  color: var(--logic-ink);
  font: inherit;
}

#logicCategorySelect {
  min-height: 44px;
  padding: 0 12px;
}

.logic-category-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.logic-category-buttons button,
#logicNextTopicBtn,
#logicSubmitBtn,
#logicCopyResultBtn {
  min-height: 40px;
  border: 1px solid var(--logic-border);
  border-radius: 8px;
  background: #fffdf8;
  color: var(--logic-ink);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

.logic-category-buttons button {
  padding: 0 14px;
}

.logic-category-buttons button.is-active {
  border-color: var(--logic-teal);
  background: #e4f4ef;
  color: var(--logic-teal-dark);
}

.logic-topic-card {
  background: linear-gradient(135deg, #fffdf8 0%, #eaf6f2 100%);
}

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

.logic-topic-head span {
  display: inline-flex;
  margin-bottom: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #e4f4ef;
  color: var(--logic-teal-dark);
  font-size: 0.86rem;
  font-weight: 800;
}

#logicNextTopicBtn,
#logicCopyResultBtn {
  flex: 0 0 auto;
  padding: 0 14px;
}

.logic-topic-text {
  color: #1f2a28;
  font-size: 1.12rem;
  font-weight: 720;
}

.logic-input-hint {
  margin-bottom: 12px;
}

#logicChainInput {
  min-height: 260px;
  padding: 14px;
  resize: vertical;
  line-height: 1.7;
}

#logicChainInput:focus,
#logicCategorySelect:focus,
.logic-category-buttons button:focus-visible,
#logicNextTopicBtn:focus-visible,
#logicSubmitBtn:focus-visible,
#logicCopyResultBtn:focus-visible {
  outline: 3px solid rgba(27, 127, 114, 0.2);
  outline-offset: 2px;
  border-color: var(--logic-teal);
}

.logic-form-actions,
.logic-result-head {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
}

#logicSubmitBtn {
  padding: 0 18px;
  border-color: var(--logic-teal);
  background: var(--logic-teal);
  color: #fff;
}

#logicSubmitBtn:disabled {
  cursor: wait;
  opacity: 0.72;
}

#logicPracticeStatus {
  margin: 0;
  color: var(--logic-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

#logicPracticeStatus[data-state="success"] {
  color: var(--logic-teal-dark);
}

#logicPracticeStatus[data-state="fail"] {
  color: var(--logic-red);
}

.logic-result-section {
  border-color: rgba(27, 127, 114, 0.28);
}

.logic-result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.logic-result-main {
  grid-column: 1 / -1;
  background: var(--logic-surface-strong);
}

.logic-result-grid ul {
  margin: 0;
  padding-left: 20px;
  color: var(--logic-muted);
  line-height: 1.75;
}

#logicRevisedText {
  white-space: pre-wrap;
  color: #25312d;
  line-height: 1.8;
}

@media (max-width: 920px) {
  .logic-hero,
  .logic-layout {
    grid-template-columns: 1fr;
  }

  .logic-quota-note {
    min-height: auto;
  }
}

@media (max-width: 620px) {
  .logic-shell {
    width: min(100% - 20px, 1180px);
    padding: 22px 0 42px;
  }

  .logic-card {
    padding: 16px;
  }

  .logic-reason-list,
  .logic-result-grid {
    grid-template-columns: 1fr;
  }

  .logic-topic-head,
  .logic-form-actions,
  .logic-result-head {
    align-items: stretch;
    flex-direction: column;
  }

  #logicNextTopicBtn,
  #logicSubmitBtn,
  #logicCopyResultBtn {
    width: 100%;
  }

  .logic-category-buttons button {
    flex: 1 1 calc(50% - 8px);
  }
}