:root {
    --primary-color: #A8703F;
    --secondary-color: #5C614D;
    --success-color: #27ae60;
    --warning-color: #e74c3c;
    --light-bg: #ffffff;
    --accent-color: #A8703F;
    --soft-color: #FAF3E9;
    --muted-color: #FAF3E9;
    --dark-text: #212529;
    --border-color: #A8703F;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #FAF3E9 0%, #f0e6d8 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark-text);
}

.container {
    width: 100%;
    margin: 0;
    background-color: transparent;
    border-radius: 0;
    box-shadow: none;
    overflow: visible;
}

/* 答题页面内容区域有白色背景 */
.quiz-page .tab-content {
    background-color: #ffffffcb;
    padding: 20px;
    border-radius: 0 0 15px 15px;
}

/* 匹配题容器样式 */
.matching-wrapper {
    width: 100%;
}

.matching-card {
    background-color: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 章节选择页面样式 */
.chapter-select-page {
    padding: 40px;
    text-align: center;
}

.chapter-title {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.chapter-subtitle {
    font-size: 1.2rem;
    color: #6c757d;
    margin-bottom: 40px;
}

.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 28px;
    margin-top:20px;
}

.chapter-card {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    padding: 10px 3px;
    text-align: center;
    box-shadow: var(--card-shadow);
    border: 2px solid var(--primary-color);
    transition: all 0.4s ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.chapter-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
    border-color: var(--secondary-color);
    background: rgba(250, 243, 233, 0.95);
}

.chapter-number {
    font-size: 3rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-weight: 700;
}

.chapter-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

.chapter-desc {
    color: #6c757d;
    font-size: 0.95rem;
    line-height: 1.4;
}

/* 答题页面样式 */
.quiz-page {
    display: none;
}

header {
    background: linear-gradient(135deg, var(--primary-color), #8b5c35);
    color: white;
    padding: 30px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.back-btn {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.back-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.header-title {
    text-align: center;
    flex: 1;
    min-width: 250px;
}

h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.current-chapter {
    font-size: 1.1rem;
    opacity: 0.9;
}

.nav-tabs {
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
    background-color: white;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 15px 25px;
    margin: 0;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: #6c757d;
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background-color: #f0f4ff;
}

.tab-btn:hover:not(.active) {
    color: var(--secondary-color);
    background-color: #f8f9ff;
}

.tab-content {
    display: none;
    padding: 30px;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-content.active {
    display: block;
}

.question-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: var(--card-shadow);
    border-left: 5px solid var(--primary-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.question-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

.question-text {
    font-size: 1.4rem;
    margin-bottom: 20px;
    font-weight: 600;
    color: var(--secondary-color);
    line-height: 1.5;
}

.options-container {
    margin: 15px 0;
}

.option {
    padding: 15px 20px;
    margin: 10px 0;
    background-color: var(--light-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
}

.option:hover {
    background-color: #e9ecef;
    border-color: #adb5bd;
}

.option.selected {
    background-color: #d0ebff;
    border-color: #4361ee;
    color: var(--primary-color);
    font-weight: 600;
}

.option.correct {
    background-color: #d3f9d8;
    border-color: #4caf50;
    color: #2e7d32;
}

.option.incorrect {
    background-color: #ffeaea;
    border-color: #f44336;
    color: #c62828;
}

.true-false-options {
    display: flex;
    gap: 20px;
    margin-top: 15px;
}

.true-false-option {
    padding: 12px 30px;
    background-color: var(--light-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    font-weight: 600;
    min-width: 100px;
    text-align: center;
}

.true-false-option:hover {
    background-color: #e9ecef;
    border-color: #adb5bd;
}

.true-false-option.selected {
    background-color: #d0ebff;
    border-color: #4361ee;
    color: var(--primary-color);
}

.match-container {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    padding: 10px 0;
}

.left-column, .right-column {
    flex: 1;
    min-width: 280px;
    max-width: 50%;
}

.match-title {
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--secondary-color);
    font-size: 1.2rem;
}

.match-item {
    padding: 15px;
    margin: 10px 0;
    background-color: var(--light-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    text-align: center;
}

.match-item:hover {
    background-color: #e9ecef;
    border-color: #adb5bd;
}

.match-item.selected {
    background-color: #d0ebff;
    border-color: #4361ee;
    color: var(--primary-color);
    font-weight: 600;
}

/* 正确项（绿） */
.match-item.correct {
    background-color: #f0f8fb;
    border-color: #48bb78;
    color: #2f855a;
}

/* 错误项（红） */
.match-item.incorrect {
    background-color: #fff5f5;
    border-color: #e53e3e;
    color: #c53030;
}

.fill-blank-input {
    width: 100%;
    padding: 15px;
    margin: 10px 0;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
}

.fill-blank-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.short-answer-textarea {
    width: 100%;
    height: 120px;
    padding: 15px;
    margin: 15px 0;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
    resize: vertical;
    transition: border-color 0.3s ease;
}

.short-answer-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.btn-group {
    margin-top: 20px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

.btn-success {
    background-color: #4caf50;
    color: white;
}

.btn-success:hover {
    background-color: #45a049;
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

.answer-section {
    margin-top: 20px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #4361ee;
    display: none;
}

.answer-section.show {
    display: block;
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from { opacity: 0; max-height: 0; }
    to { opacity: 1; max-height: 500px; }
}

.answer-title {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.answer-content {
    color: var(--dark-text);
    line-height: 1.6;
}

.feedback {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    display: none;
    font-weight: 600;
}

.feedback.correct {
    background-color: #d3f9d8;
    color: #2e7d32;
    border: 2px solid #4caf50;
}

.feedback.incorrect {
    background-color: #ffeaea;
    color: #c62828;
    border: 2px solid #f44336;
}

.stats {
    text-align: center;
    margin-bottom: 25px;
    font-size: 1.2rem;
    color: var(--secondary-color);
    font-weight: 600;
}

footer {
    text-align: center;
    padding: 20px;
    color: #6c757d;
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 20px;
}

@media (max-width: 768px) {
    .container {
        margin: 0;
        padding: 0;
    }

    body {
        padding: 0;
    }

    .chapter-select-page {
        padding: 15px 10px;
    }

    .chapter-title {
        font-size: 1.8rem;
    }

    header {
        padding: 12px 10px;
        flex-direction: column;
        text-align: center;
        border-radius: 0;
    }

    .back-btn {
        align-self: center;
        padding: 6px 12px;
        font-size: 0.9rem;
    }

    h1 {
        font-size: 1.4rem;
    }

    .tab-btn {
        padding: 8px 6px;
        font-size: 0.75rem;
    }

    .quiz-page .tab-content {
        padding: 8px;
        border-radius: 0;
    }

    .question-text {
        font-size: 1rem;
    }

    .question-card {
        padding: 15px;
    }

    .matching-card {
        padding: 10px;
        border-radius: 8px;
    }

    .match-container {
        flex-direction: row;
        gap: 5px;
        padding: 0;
        margin: 0;
    }

    .left-column, .right-column {
        min-width: 49%;
        max-width: 49%;
    }

    .match-title {
        font-size: 0.8rem;
        margin-bottom: 5px;
    }

    .match-item {
        padding: 8px 3px;
        margin: 3px 0;
        font-size: 0.8rem;
    }

    .btn-group {
        flex-direction: column;
    }
}

/* 三空输入框组样式（适配手机/电脑） */
.fill-blank-group {
display: flex;
flex-wrap: wrap; /* 手机端自动换行 */
gap: 15px; /* 输入框之间的间距 */
margin: 15px 0;
}
.fill-blank-item {
flex: 1; /* 电脑端平分宽度 */
min-width: 200px; /* 手机端最小宽度，避免太窄 */
}
.fill-blank-item label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
}

.blank-placeholder {
color: #4361ee;
font-weight: 700;
text-decoration: underline;
}
/* 提交/重置按钮样式 */
.btn-group .btn {
margin-right: 10px;
padding: 8px 16px;
}

@media (min-width: 1200px) {
.chapter-grid {
    grid-template-columns: repeat(5, 1fr);
}
}

.option[disabled],
.true-false-option[disabled],
.match-item[disabled] {
pointer-events: none !important;
opacity: 0.7 !important;
cursor: not-allowed !important;
user-select: none !important;
}


/* 按钮样式 */
.btn-secondary {
padding: 8px 16px;
border: none;
border-radius: 4px;
background-color: #6c757d;
color: white;
cursor: pointer;
transition: background-color 0.2s;
}
.btn-secondary:hover {
background-color: #5c636a;
}

/* 1. 类型选择页卡片样式（适配你的现有样式体系） */
.hover-card {
  transition: all 0.3s ease;
}
.hover-card:hover {
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}

/* 2. 右上角换一批按钮样式 */
.text-blue-600 {
  color: var(--primary-color) !important;
  font-size: 18px !important;
  border: none !important;
  background-color: #ffffff !important;
}
.hover\:underline:hover {
  text-decoration: underline;
}
.flex.justify-between.items-center {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

/* 3. 适配类型选择页的网格布局（复用你的响应式） */
.grid-cols-1.md\:grid-cols-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 768px) {
  .grid-cols-1.md\:grid-cols-2 {
grid-template-columns: 1fr 1fr;
  }
}

/* 4. 提示框样式（保留，不冲突） */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 24px 40px;
  border-radius: 8px;
  color: white;
  z-index: 9999;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(-20px);
}
.toast.success {
  background-color: #48bb78;
}
.toast.error {
  background-color: #e53e3e;
}

/* 5. 修复按钮图标垂直居中 */
.flex.items-center i {
  margin-right: 10px;
}

#matching-questions-container .bg-white {
  padding: 20px !important; /* 新增：容器内边距，让内容和边框有距离 */
  border-radius: 8px !important;
  box-sizing: border-box !important; /* 新增：内边距不超出容器宽度 */
}

/* 重置本题按钮容器：增加上边距，避免贴边 */
#matching-questions-container .text-center {
  margin-top: 20px !important;
  padding-left: 30px !important;
  padding-right: 30px !important;
  padding-bottom: 20px;
  width: 100% !important;
  box-sizing: border-box !important;
}