/* 定义 CSS 变量 */
:root {
    --bg-color: #f9fafb;
    --text-color-primary: #1f2937;
    --text-color-secondary: #6b7280;
    --card-bg-color: #ffffff;
    --card-border-color: #e5e7eb;
    --primary-color: #3b82f6;
    --primary-color-hover: #2563eb;
    --input-border-color: #d1d5db;
    --input-focus-shadow: rgba(59, 130, 246, 0.4);
    --btn-secondary-bg: #e5e7eb;
    --btn-secondary-hover-bg: #d1d5db;
}

[data-theme="dark"] {
    --bg-color: #111827;
    --text-color-primary: #f3f4f6;
    --text-color-secondary: #9ca3af;
    --card-bg-color: #1f2937;
    --card-border-color: #374151;
    --primary-color: #60a5fa;
    --primary-color-hover: #3b82f6;
    --input-border-color: #4b5563;
    --input-focus-shadow: rgba(96, 165, 250, 0.4);
    --btn-secondary-bg: #374151;
    --btn-secondary-hover-bg: #4b5563;
}

.toggle-btn {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    border: 1px solid var(--card-border-color);
    background-color: var(--card-bg-color);
    color: var(--text-color-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    z-index: 1000;
}

.toggle-btn:hover {
    color: var(--text-color-primary);
    box-shadow: 0 0 0 4px var(--input-focus-shadow);
}

.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1rem;
}

.settings-btn {
    position: fixed;
    right: 1rem;
    bottom: 1.5rem;
}

/* 模态框样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.modal-overlay.open {
    display: flex;
}

/* 当模态框打开时，禁止body滚动 */
body.modal-open {
    overflow: hidden;
}

.modal-card {
    width: 90%;
    max-width: 32rem;
    max-height: 80vh;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
    align-self: center;
    transform: translateY(100%);
    opacity: 0;
    animation: slideOut 0.3s ease-out forwards;
}

.modal-card.in {
    animation: slideIn 0.3s ease-out forwards;
}

@keyframes slideIn {
    from { 
        transform: translateY(50px);
        opacity: 0;
    }
    to { 
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from { 
        transform: translateY(0);
        opacity: 1;
    }
    to { 
        transform: translateY(50px);
        opacity: 0;
    }
}

.setting-header {
    border-radius: 0.6rem;
    margin: 1rem 0 1rem -0.5rem;
    background-color: var(--primary-color);
    color: var(--text-color-primary);
    padding: 0.7rem;
    font-size: 1.25rem;
}

.close-btn {
    position: absolute;
    top: 0.5rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 2.5rem;
    color: #d1d5db;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.close-btn:hover {
    color: #ffffff;
}

/* 列表之间的分隔线样式 */
.modal-content h3.list-divider {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--card-border-color);
}

.modal-content ul {
    list-style: none;
}

.modal-content ul li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 0.5rem;
    padding: 0.75rem;
    cursor: pointer;
}

.modal-content ul li a {
    text-decoration: none;
    color: var(--text-color-primary);
    transition: background-color 0.2s;
}

.modal-content ul li button {
    border: none;
    outline: none;
    color: var(--text-color-primary);
    background-color: transparent;
    font-size: 1rem;
}

.modal-content ul li a i {
    margin-right: 2rem;
}

.modal-content ul li:hover {
    background-color: var(--btn-secondary-bg);
}

.modal-content ul li.active {
    font-weight: bold;
    color: var(--primary-color);
}

.modal-content ul li.disabled {
    color: var(--text-color-secondary);
    cursor: not-allowed;
    opacity: 0.6;
}

/* 搜索区域样式 */
.search-area {
    display: flex;
    margin-bottom: 1.5rem;
    gap: 0.5rem;
}

.search-input {
    flex-grow: 1;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--input-border-color);
    border-radius: 0.5rem;
    font-size: 0.9rem;
    background-color: var(--bg-color);
    color: var(--text-color-primary);
    transition: border-color 0.2s, box-shadow 0.2s, background-color 1s;
}

.search-btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: none;
    background-color: var(--primary-color);
    color: #ffffff;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

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

/* 单词卡片样式 */
.word-card {
    border: 1px solid var(--card-border-color);
    border-radius: 0.5rem;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
    min-height: 10rem;
}

/* 单词与级别行 */
.word-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.word-text {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-color-primary);
    flex-shrink: 1;
    /* 单词过长时允许收缩 */
}

.word-level {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color-hover);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
}

/* 音标与发音容器 */
.phonetic-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

/* 音标样式 */
.word-phonetic {
    color: var(--text-color-secondary);
    font-style: italic;
}

/* 发音组样式 */
.pronounce-group {
    display: flex;
    gap: 1rem;
}

.pronounce-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    border-radius: 0.25rem;
    cursor: pointer;
    color: var(--text-color-secondary);
    transition: all 0.2s;
}

.pronounce-item:hover {
    color: var(--primary-color);
    background-color: var(--btn-secondary-bg);
}

.pronounce-item .label {
    font-size: 0.8rem;
    font-style: normal;
    font-weight: bold;
    border: 1px solid var(--text-color-secondary);
    border-radius: 3px;
    padding: 0 3px;
}

.pronounce-item:hover .label {
    border-color: var(--primary-color);
}

.pronounce-item .fa-volume-up {
    font-size: 1.2rem;
}

.definition-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.2rem;
}

/* 词性样式 */
.word-pos {
    color: #a78bfa;
    margin-bottom: 0.75rem;
}

/* 释义样式 */
.word-def {
    color: var(--text-color-primary);
    margin-bottom: 1rem;
}

/* 短语样式 */
.phrase {
    color: var(--text-color-secondary);
    font-size: 0.875rem;
}

.phrase-list {
    min-height: 10rem;
    max-height: 10rem;
    overflow-y: auto;
    margin-bottom: 1rem;
    padding: 0 1rem;
    font-size: 0.9rem;
}

.list-item:not(:last-child) {
    margin-bottom: 0.5rem;
}

.sentences-list {
    max-height: 24rem;
    overflow-y: auto;
}

.sentence-en {
    color: var(--text-color-primary);
    margin-bottom: 0.25rem;
}

.sentence-cn {
    color: var(--text-color-secondary);
}

/* 控制按钮区域 */
.control-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 右侧按钮组 */
.right-controls {
    display: flex;
    gap: 0.5rem;
}

.control-btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: none;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

/* 随机按钮样式 */
#randomBtn {
    background-color: var(--btn-secondary-bg);
    color: var(--text-color-primary);
}

#randomBtn:hover {
    background-color: var(--btn-secondary-hover-bg);
}

.prev-btn {
    background-color: var(--btn-secondary-bg);
    color: var(--text-color-primary);
}

.prev-btn:hover {
    background-color: var(--btn-secondary-hover-bg);
}

.next-btn {
    background-color: var(--primary-color);
    color: #ffffff;
}

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

.next-btn i {
    margin-left: 0.5rem;
    margin-right: 0;
}

.progress-text {
    color: var(--text-color-primary);
    font-size: 0.875rem;
}