* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --razer-green: #44D62C;
  --razer-green-dim: #36a823;
  --bg-black: #0a0a0a;
  --bg-card: #111111;
  --bg-card-hover: #1a1a1a;
  --bg-input: #1a1a1a;
  --bg-header: #000000;
  --text-primary: #44D62C;
  --text-secondary: #888888;
  --text-dim: #555555;
  --border-color: #222222;
  --border-hover: #44D62C;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg-black);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

/* 头部 */
.header {
  background: var(--bg-header);
  color: var(--text-primary);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(68, 214, 44, 0.15);
  border-bottom: 1px solid var(--border-color);
}

.header-left h1 {
  font-size: 20px;
  font-weight: 600;
  color: var(--razer-green);
}

.header-left .subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-left: 8px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.progress-info {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 按钮 */
.btn {
  padding: 8px 16px;
  border: 1px solid var(--razer-green);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  background: transparent;
  color: var(--razer-green);
}

.btn:hover {
  background: var(--razer-green);
  color: #000;
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  border-color: var(--text-dim);
  color: var(--text-dim);
}

.btn:disabled:hover {
  background: transparent;
  color: var(--text-dim);
  transform: none;
}

.btn-small {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-speak {
  background: var(--razer-green);
  color: #000;
  margin: 8px 0;
  font-weight: 600;
}

.btn-speak:hover {
  background: var(--razer-green-dim);
}

/* 页面 */
.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
}

/* 欢迎框 */
.welcome-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 24px;
  text-align: center;
}

.welcome-box h2 {
  font-size: 22px;
  color: var(--razer-green);
  margin-bottom: 8px;
}

.welcome-box p {
  margin: 6px 0;
  color: var(--text-secondary);
  font-size: 15px;
}

/* 用户选择 */
.user-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  max-width: 600px;
  margin: 0 auto;
}

.user-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 14px;
  padding: 32px 24px;
  cursor: pointer;
  text-align: center;
  transition: all 0.25s;
}

.user-card:hover {
  border-color: var(--razer-green);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(68, 214, 44, 0.15);
}

.user-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--razer-green);
  color: #000;
  font-size: 28px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.user-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

/* 书本选择 */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.book-card {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.25s;
}

.book-card:hover {
  border-color: var(--razer-green);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(68, 214, 44, 0.12);
}

.book-card .book-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.book-card .book-author {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.book-card .book-progress {
  font-size: 13px;
  color: var(--razer-green);
}

.book-card .book-chapters {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* 章节列表 */
.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.chapter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
}

.chapter-card:hover {
  border-color: var(--razer-green);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(68, 214, 44, 0.1);
}

.chapter-card .ch-num {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.chapter-card .ch-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.chapter-card .ch-progress {
  font-size: 12px;
  color: var(--razer-green);
  margin-top: 6px;
}

/* 翻译页头部 */
.chapter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.chapter-header h2 {
  font-size: 20px;
  color: var(--text-primary);
}

.page-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 8px;
}

#page-indicator {
  font-size: 14px;
  color: var(--text-secondary);
  min-width: 80px;
  text-align: center;
}

/* 章节导航 */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
}

.bottom-nav {
  margin-top: 24px;
  margin-bottom: 40px;
}

/* 句子区域 */
#sentences-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sentence-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
}

.sentence-num {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.sentence-en {
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 12px;
  user-select: text;
}

.sentence-en .word {
  cursor: pointer;
  padding: 1px 3px;
  border-radius: 3px;
  transition: all 0.15s;
}

.sentence-en .word:hover {
  background: rgba(68, 214, 44, 0.15);
  color: var(--razer-green);
}

/* 双击查过的单词变色 */
.sentence-en .word.word-looked-up {
  color: #f0c040;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.sentence-zh-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 16px;
  line-height: 1.6;
  transition: all 0.2s;
  resize: vertical;
  min-height: 48px;
  font-family: inherit;
  background: var(--bg-input);
  color: var(--text-primary);
}

.sentence-zh-input::placeholder {
  color: var(--text-dim);
}

.sentence-zh-input:focus {
  outline: none;
  border-color: var(--razer-green);
  box-shadow: 0 0 0 2px rgba(68, 214, 44, 0.15);
}

.sentence-zh-input.has-translation {
  border-color: var(--razer-green);
  background: rgba(68, 214, 44, 0.05);
}

.btn-submit {
  height: 48px;
  padding: 0 20px;
  font-size: 15px;
  font-weight: 600;
  background: var(--razer-green);
  color: #000;
  border: none;
}

.btn-submit:hover {
  background: var(--razer-green-dim);
}

/* 用户答案 */
.user-answer-box {
  background: var(--bg-black);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

.answer-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
  font-weight: 600;
}

.user-answer-text {
  font-size: 16px;
  color: var(--text-primary);
  line-height: 1.6;
}

/* 分数 */
.score-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-black);
  border: 2px solid;
  border-radius: 10px;
  padding: 12px 18px;
  margin-bottom: 10px;
}

.score-value {
  font-size: 28px;
  font-weight: 700;
}

.score-label {
  font-size: 14px;
  font-weight: 600;
}

/* 参考答案 */
.ref-answer-box {
  background: var(--bg-black);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

.ref-answer-text {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 重新翻译按钮 */
.btn-reset {
  border-color: #ff4444;
  color: #ff4444;
}

.btn-reset:hover {
  background: #ff4444;
  color: #000;
}

/* AI点评区域 */
.ai-feedback-box {
  background: rgba(68, 214, 44, 0.08);
  border: 1px solid rgba(68, 214, 44, 0.3);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

.feedback-text {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.6;
}

.ai-section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.ai-highlights, .ai-suggestions {
  margin-bottom: 10px;
  padding: 10px 14px;
  background: var(--bg-black);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.highlight-item {
  font-size: 13px;
  color: #44D62C;
  line-height: 1.8;
}

.suggestion-item {
  font-size: 13px;
  color: #f0c040;
  line-height: 1.8;
}

/* 遗漏单词 */
.ai-missed-words, .ai-wrong-words {
  margin-bottom: 10px;
  padding: 12px 14px;
  background: rgba(255, 68, 68, 0.08);
  border: 1px solid rgba(255, 68, 68, 0.3);
  border-radius: 8px;
}

.missed-word-item, .wrong-word-item {
  margin: 6px 0;
  padding: 8px 10px;
  background: var(--bg-black);
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.6;
}

.missed-word-item {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.wrong-word-line {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.word-en {
  font-weight: 700;
  color: #ff6b6b;
  font-size: 14px;
}

.word-arrow {
  color: var(--text-dim);
  font-size: 12px;
}

.word-zh {
  color: var(--text-primary);
  font-weight: 600;
}

.word-wrong {
  color: #ff4444;
  text-decoration: line-through;
}

.word-correct {
  color: var(--razer-green);
  font-weight: 600;
}

.word-note {
  color: var(--text-secondary);
  font-size: 12px;
  display: block;
  margin-top: 2px;
}

/* 知识薄弱点 */
.ai-weak-points {
  margin-bottom: 10px;
  padding: 12px 14px;
  background: rgba(240, 192, 64, 0.08);
  border: 1px solid rgba(240, 192, 64, 0.3);
  border-radius: 8px;
}

.weakpoint-item {
  font-size: 13px;
  color: #f0c040;
  line-height: 1.8;
}

/* 模态框 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 200;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  max-width: 420px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 8px 32px rgba(68, 214, 44, 0.15);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 24px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
}

.modal-close:hover {
  color: var(--razer-green);
}

#word-title {
  font-size: 24px;
  color: var(--razer-green);
  margin-bottom: 4px;
  text-transform: lowercase;
}

.word-phonetic {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.word-section {
  margin-top: 16px;
}

.word-section h4 {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 600;
}

.word-section p,
.word-section div {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
}

.word-section .loading {
  color: var(--text-dim);
  font-style: italic;
}

.word-section .error {
  color: #ff4444;
}

.definition-item {
  margin-bottom: 8px;
  padding: 10px;
  background: var(--bg-black);
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.definition-item .pos {
  font-size: 12px;
  color: var(--razer-green);
  font-weight: 600;
  text-transform: uppercase;
}

.definition-item .def {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* 响应式 */
@media (max-width: 600px) {
  .header {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

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

  .chapter-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .sentence-en {
    font-size: 15px;
  }
}