/* =====================================================
   AI英文学习卡片和测试题 - 样式表  (前缀: aelc-)
   ===================================================== */

/* ---- CSS 变量 ---- */
:root {
    --aelc-primary:       #1d6fa4;
    --aelc-primary-hover: #155e8e;
    --aelc-primary-light: #e8f4fc;
    --aelc-success:       #059669;
    --aelc-success-light: #ecfdf5;
    --aelc-warning:       #d97706;
    --aelc-warning-light: #fffbeb;
    --aelc-danger:        #dc2626;
    --aelc-danger-light:  #fef2f2;
    --aelc-bg:            #f0f8ff;
    --aelc-surface:       #ffffff;
    --aelc-border:        #cce3f5;
    --aelc-text:          #0f2d42;
    --aelc-text-muted:    #4a7a9b;
    --aelc-text-light:    #8cb8d4;
    --aelc-shadow-sm:     0 1px 4px rgba(29,111,164,.10);
    --aelc-shadow-md:     0 4px 14px rgba(29,111,164,.13);
    --aelc-shadow-lg:     0 8px 28px rgba(29,111,164,.16);
    --aelc-radius:        12px;
    --aelc-radius-sm:     7px;
    --aelc-toolbar-h:     50px;
    --aelc-transition:    0.2s ease;
}

/* 暗色主题 */
.aelc-dark {
    --aelc-primary:       #5ba8d4;
    --aelc-primary-hover: #7ec0e8;
    --aelc-primary-light: #0d2233;
    --aelc-bg:            #091822;
    --aelc-surface:       #0f2233;
    --aelc-border:        #1e3d54;
    --aelc-text:          #e0f0fb;
    --aelc-text-muted:    #8dc5e6;
    --aelc-text-light:    #4a7a9b;
    --aelc-shadow-sm:     0 1px 4px rgba(0,0,0,.40);
    --aelc-shadow-md:     0 4px 14px rgba(0,0,0,.45);
    --aelc-shadow-lg:     0 8px 28px rgba(0,0,0,.55);
    --aelc-success-light: #052e1a;
    --aelc-warning-light: #2c1a00;
    --aelc-danger-light:  #2c0a0a;
}

/* ---- 全局容器 ---- */
.aelc-container {
    display: flex;
    flex-direction: column;
    background: var(--aelc-bg);
    border-radius: var(--aelc-radius);
    overflow: hidden;
    box-shadow: var(--aelc-shadow-lg);
    min-height: 640px;
    border: 1px solid var(--aelc-border);
    transition: background var(--aelc-transition), border-color var(--aelc-transition);
}

/* ---- 工具栏 ---- */
.aelc-toolbar {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 12px;
    height: var(--aelc-toolbar-h);
    background: var(--aelc-surface);
    border-bottom: 1px solid var(--aelc-border);
    flex-wrap: wrap;
    min-height: var(--aelc-toolbar-h);
    transition: background var(--aelc-transition), border-color var(--aelc-transition);
}

.toolbar-group        { display: flex; align-items: center; gap: 2px; }
.toolbar-group--right { margin-left: auto; }

.aelc-btn-toolbar {
    padding: 5px 11px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: var(--aelc-surface);
    color: var(--aelc-text);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--aelc-transition);
    white-space: nowrap;
}

.aelc-btn-toolbar:hover {
    background: var(--aelc-primary-light);
    border-color: var(--aelc-primary);
    color: var(--aelc-primary);
}

.aelc-btn-toolbar--ai {
    background: linear-gradient(135deg, #1d6fa4, #0ea5e9);
    color: #fff;
    border-color: transparent;
    font-weight: 600;
}

.aelc-btn-toolbar--ai:hover {
    background: linear-gradient(135deg, #155e8e, #0284c7);
    color: #fff;
    border-color: transparent;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(29,111,164,.40);
}

/* ---- 主内容区三列布局 ---- */
.aelc-main {
    display: grid;
    grid-template-columns: 210px 1fr 1fr;
    min-height: 600px;
    overflow: hidden;
}

/* ---- 历史记录面板 ---- */
.aelc-history-panel {
    border-right: 1px solid var(--aelc-border);
    display: flex;
    flex-direction: column;
    background: var(--aelc-surface);
    overflow: hidden;
    transition: background var(--aelc-transition);
}

.aelc-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px 8px;
    border-bottom: 1px solid var(--aelc-border);
    flex-shrink: 0;
}

.aelc-panel-header h3 {
    margin: 0;
    font-size: 13px;
    font-weight: 600;
    color: var(--aelc-text);
}

.aelc-clear-btn {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--aelc-border);
    background: transparent;
    color: var(--aelc-text-muted);
    cursor: pointer;
    transition: all var(--aelc-transition);
}

.aelc-clear-btn:hover {
    border-color: var(--aelc-danger);
    color: var(--aelc-danger);
}

.aelc-history-search {
    padding: 8px 10px;
    flex-shrink: 0;
}

.aelc-history-search input {
    width: 100%;
    padding: 5px 10px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    font-size: 12px;
    background: var(--aelc-bg);
    color: var(--aelc-text);
    box-sizing: border-box;
    outline: none;
    transition: border-color var(--aelc-transition);
}

.aelc-history-search input:focus { border-color: var(--aelc-primary); }

.aelc-history-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 6px;
}

.aelc-history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 10px;
    color: var(--aelc-text-light);
    font-size: 12px;
    gap: 6px;
    text-align: center;
}

.aelc-empty-icon   { font-size: 28px; }
.aelc-empty-main   { font-weight: 600; color: var(--aelc-text-muted); }
.aelc-empty-sub    { font-size: 11px; }

.aelc-history-item {
    padding: 8px 10px;
    border-radius: var(--aelc-radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    margin-bottom: 3px;
    transition: all var(--aelc-transition);
}

.aelc-history-item:hover {
    background: var(--aelc-primary-light);
    border-color: var(--aelc-border);
}

.aelc-history-item.active {
    background: var(--aelc-primary-light);
    border-color: var(--aelc-primary);
}

.aelc-history-item-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--aelc-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.aelc-history-item-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    color: var(--aelc-text-muted);
    margin-top: 2px;
}

.aelc-history-item-del {
    border: none;
    background: transparent;
    color: var(--aelc-text-light);
    cursor: pointer;
    font-size: 11px;
    padding: 1px 4px;
    border-radius: 3px;
    transition: all var(--aelc-transition);
}

.aelc-history-item-del:hover { color: var(--aelc-danger); background: var(--aelc-danger-light); }

.aelc-history-badge {
    display: inline-block;
    font-size: 10px;
    padding: 1px 6px;
    border-radius: 10px;
    background: var(--aelc-primary-light);
    color: var(--aelc-primary);
    margin-top: 3px;
}

/* ---- 编辑器面板 ---- */
.aelc-editor-panel {
    border-right: 1px solid var(--aelc-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    background: var(--aelc-bg);
    transition: background var(--aelc-transition);
}

.aelc-editor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px 8px;
    border-bottom: 1px solid var(--aelc-border);
    background: var(--aelc-surface);
    flex-shrink: 0;
}

.aelc-editor-title { font-size: 13px; font-weight: 600; color: var(--aelc-text); }
.aelc-editor-meta  { font-size: 11px; color: var(--aelc-text-muted); }

.aelc-form {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.aelc-form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.aelc-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--aelc-text);
}

.aelc-label-hint {
    font-size: 11px;
    font-weight: 400;
    color: var(--aelc-text-muted);
    margin-left: 4px;
}

.required-mark { color: var(--aelc-danger); margin-left: 2px; }

.aelc-input {
    padding: 8px 12px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    font-size: 13px;
    background: var(--aelc-surface);
    color: var(--aelc-text);
    outline: none;
    transition: border-color var(--aelc-transition), box-shadow var(--aelc-transition);
}

.aelc-input:focus {
    border-color: var(--aelc-primary);
    box-shadow: 0 0 0 3px rgba(29,111,164,.12);
}

.aelc-textarea {
    padding: 8px 12px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    font-size: 13px;
    background: var(--aelc-surface);
    color: var(--aelc-text);
    outline: none;
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
    transition: border-color var(--aelc-transition), box-shadow var(--aelc-transition);
    line-height: 1.5;
}

.aelc-textarea:focus {
    border-color: var(--aelc-primary);
    box-shadow: 0 0 0 3px rgba(29,111,164,.12);
}

.aelc-char-counter {
    font-size: 11px;
    color: var(--aelc-text-muted);
    text-align: right;
}

/* 难度选择器 */
.aelc-difficulty-selector {
    display: flex;
    gap: 8px;
}

.aelc-diff-item { flex: 1; cursor: pointer; }

.aelc-diff-item input[type="radio"] { display: none; }

.aelc-diff-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 6px;
    border: 2px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: var(--aelc-surface);
    transition: all var(--aelc-transition);
    cursor: pointer;
    text-align: center;
}

.aelc-diff-item input[type="radio"]:checked + .aelc-diff-card {
    border-color: var(--aelc-primary);
    background: var(--aelc-primary-light);
}

.aelc-diff-card:hover { border-color: var(--aelc-primary); }

.diff-icon { font-size: 18px; }
.diff-name { font-size: 12px; font-weight: 700; color: var(--aelc-text); }
.diff-desc { font-size: 10px; color: var(--aelc-text-muted); }

/* 内容类型选择器 */
.aelc-type-selector {
    display: flex;
    gap: 8px;
}

.aelc-type-item { flex: 1; cursor: pointer; }
.aelc-type-item input[type="radio"] { display: none; }

.aelc-type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 6px;
    border: 2px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: var(--aelc-surface);
    transition: all var(--aelc-transition);
    cursor: pointer;
    text-align: center;
}

.aelc-type-item input[type="radio"]:checked + .aelc-type-card {
    border-color: var(--aelc-primary);
    background: var(--aelc-primary-light);
}

.aelc-type-card:hover { border-color: var(--aelc-primary); }

.type-icon { font-size: 18px; }
.type-name { font-size: 12px; font-weight: 700; color: var(--aelc-text); }
.type-desc { font-size: 10px; color: var(--aelc-text-muted); }

/* 卡片数量选择器 */
.aelc-count-selector {
    display: flex;
    gap: 8px;
}

.aelc-count-item {
    flex: 1;
    cursor: pointer;
}

.aelc-count-item input[type="radio"] { display: none; }

.count-label {
    display: block;
    text-align: center;
    padding: 7px 4px;
    border: 2px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    font-size: 13px;
    font-weight: 600;
    color: var(--aelc-text);
    background: var(--aelc-surface);
    transition: all var(--aelc-transition);
    cursor: pointer;
}

.aelc-count-item input[type="radio"]:checked + .count-label {
    border-color: var(--aelc-primary);
    background: var(--aelc-primary-light);
    color: var(--aelc-primary);
}

.count-label:hover { border-color: var(--aelc-primary); }

/* 复选框（测试题类型） */
.aelc-test-types {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.aelc-checkbox-item {
    display: flex;
    align-items: center;
    gap: 7px;
    cursor: pointer;
    padding: 6px 12px;
    border: 2px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: var(--aelc-surface);
    transition: all var(--aelc-transition);
    position: relative;
}

.aelc-checkbox-item:hover {
    border-color: var(--aelc-primary);
    background: var(--aelc-primary-light);
}

.aelc-checkbox-item input[type="checkbox"] { display: none; }

.aelc-checkbox-icon {
    width: 16px;
    height: 16px;
    border: 2px solid var(--aelc-border);
    border-radius: 4px;
    background: var(--aelc-surface);
    flex-shrink: 0;
    transition: all var(--aelc-transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.aelc-checkbox-item input[type="checkbox"]:checked ~ .aelc-checkbox-icon {
    background: var(--aelc-primary);
    border-color: var(--aelc-primary);
}

.aelc-checkbox-item input[type="checkbox"]:checked ~ .aelc-checkbox-icon::after {
    content: '';
    display: block;
    width: 4px;
    height: 8px;
    border: 2px solid #fff;
    border-top: none;
    border-left: none;
    transform: rotate(45deg) translate(-1px, -1px);
}

.aelc-checkbox-item.checked {
    border-color: var(--aelc-primary);
    background: var(--aelc-primary-light);
}

.aelc-checkbox-text {
    font-size: 13px;
    color: var(--aelc-text);
    font-weight: 500;
}

/* 操作按钮 */
.aelc-form-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.aelc-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--aelc-radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--aelc-transition);
    border: none;
    white-space: nowrap;
}

.aelc-btn--primary {
    background: linear-gradient(135deg, #1d6fa4, #0ea5e9);
    color: #fff;
}

.aelc-btn--primary:hover {
    background: linear-gradient(135deg, #155e8e, #0284c7);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(29,111,164,.40);
}

.aelc-btn--secondary {
    background: var(--aelc-surface);
    color: var(--aelc-text-muted);
    border: 1px solid var(--aelc-border);
}

.aelc-btn--secondary:hover {
    border-color: var(--aelc-primary);
    color: var(--aelc-primary);
}

.aelc-btn--sm {
    padding: 5px 12px;
    font-size: 12px;
}

.shortcut-hint {
    font-size: 11px;
    color: var(--aelc-text-light);
    padding: 3px 7px;
    border: 1px dashed var(--aelc-border);
    border-radius: 4px;
}

.aelc-shortcut-tip {
    font-size: 11px;
    color: var(--aelc-text-muted);
    text-align: center;
    padding: 6px 0 0;
}

/* ---- 预览面板 ---- */
.aelc-preview-panel {
    display: flex;
    flex-direction: column;
    background: var(--aelc-bg);
    overflow: hidden;
    position: relative;
    transition: background var(--aelc-transition);
}

/* Tab 标签栏 */
.aelc-tab-bar {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--aelc-border);
    background: var(--aelc-surface);
    padding: 0 8px;
    gap: 2px;
    flex-shrink: 0;
    min-height: 42px;
}

.aelc-tab {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--aelc-text-muted);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--aelc-transition);
    margin-bottom: -1px;
}

.aelc-tab:hover { color: var(--aelc-primary); }

.aelc-tab.active {
    color: var(--aelc-primary);
    border-bottom-color: var(--aelc-primary);
}

.aelc-tab-actions {
    margin-left: auto;
    display: flex;
    gap: 4px;
}

.preview-action-btn {
    padding: 4px 10px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: transparent;
    color: var(--aelc-text-muted);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--aelc-transition);
}

.preview-action-btn:hover {
    border-color: var(--aelc-primary);
    color: var(--aelc-primary);
}

/* Tab 内容区 */
.aelc-tab-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    position: relative;
}

/* 空状态 */
.aelc-preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
    gap: 10px;
}

.aelc-preview-empty .aelc-empty-icon { font-size: 48px; }
.aelc-empty-title { font-size: 16px; font-weight: 700; color: var(--aelc-text-muted); }
.aelc-empty-hint  { font-size: 13px; color: var(--aelc-text-light); line-height: 1.7; }

/* 浮动动画 */
@keyframes aelcFloat {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-8px); }
}

.aelc-float-anim { animation: aelcFloat 3s ease-in-out infinite; }

/* ---- 学习卡片区 ---- */
.aelc-cards-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.aelc-cards-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.aelc-topic-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--aelc-text);
}

.aelc-card-progress {
    font-size: 12px;
    color: var(--aelc-text-muted);
    background: var(--aelc-primary-light);
    padding: 3px 10px;
    border-radius: 20px;
    border: 1px solid var(--aelc-border);
}

/* 翻转卡片 */
.aelc-card-wrapper {
    width: 100%;
    perspective: 1000px;
}

.aelc-flashcard {
    width: 100%;
    min-height: 260px;
    cursor: pointer;
    position: relative;
    transition: transform 0.15s ease;
}

.aelc-flashcard:hover {
    transform: scale(1.008);
}

.aelc-card-inner {
    width: 100%;
    min-height: 260px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.aelc-card-inner.flipped { transform: rotateY(180deg); }

.aelc-card-front,
.aelc-card-back {
    position: absolute;
    width: 100%;
    min-height: 260px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--aelc-radius);
    padding: 24px 28px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.aelc-card-front {
    background: linear-gradient(135deg, var(--aelc-primary), #0ea5e9);
    color: #fff;
    align-items: center;
    text-align: center;
    gap: 10px;
    box-shadow: var(--aelc-shadow-md);
}

.aelc-card-back {
    background: var(--aelc-surface);
    border: 1px solid var(--aelc-border);
    transform: rotateY(180deg);
    gap: 12px;
    box-shadow: var(--aelc-shadow-md);
}

.aelc-card-word {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 1px;
    color: #fff;
    text-shadow: 0 1px 4px rgba(0,0,0,.2);
}

.aelc-card-phonetic {
    font-size: 15px;
    color: rgba(255,255,255,.85);
    font-style: italic;
    letter-spacing: 0.5px;
}

.aelc-card-pos {
    font-size: 12px;
    background: rgba(255,255,255,.2);
    padding: 2px 12px;
    border-radius: 20px;
    color: rgba(255,255,255,.9);
}

.aelc-flip-hint {
    font-size: 12px;
    color: rgba(255,255,255,.65);
    margin-top: 8px;
}

.aelc-card-meaning {
    font-size: 20px;
    font-weight: 700;
    color: var(--aelc-text);
    text-align: center;
}

.aelc-card-divider {
    height: 1px;
    background: var(--aelc-border);
    margin: 2px 0;
}

.aelc-card-example { display: flex; flex-direction: column; gap: 4px; }

.example-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--aelc-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.example-en {
    font-size: 14px;
    color: var(--aelc-text);
    font-style: italic;
    line-height: 1.5;
}

.example-zh {
    font-size: 12px;
    color: var(--aelc-text-muted);
    line-height: 1.4;
}

.aelc-card-tip-wrap { display: flex; flex-direction: column; gap: 3px; }

.tip-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--aelc-warning);
    letter-spacing: 0.5px;
}

.aelc-card-tip {
    font-size: 12px;
    color: var(--aelc-text-muted);
    background: var(--aelc-warning-light);
    border-left: 3px solid var(--aelc-warning);
    padding: 6px 10px;
    border-radius: 0 var(--aelc-radius-sm) var(--aelc-radius-sm) 0;
    line-height: 1.5;
}

/* 卡片导航按钮 */
.aelc-cards-btns {
    display: flex;
    gap: 8px;
    align-items: center;
}

.aelc-nav-btn {
    padding: 7px 16px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: var(--aelc-surface);
    color: var(--aelc-text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--aelc-transition);
}

.aelc-nav-btn:hover {
    border-color: var(--aelc-primary);
    color: var(--aelc-primary);
    background: var(--aelc-primary-light);
}

.aelc-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.aelc-nav-btn--flip {
    background: linear-gradient(135deg, #1d6fa4, #0ea5e9);
    color: #fff;
    border-color: transparent;
    font-weight: 600;
}

.aelc-nav-btn--flip:hover {
    background: linear-gradient(135deg, #155e8e, #0284c7);
    color: #fff;
    border-color: transparent;
}

/* 点指示器 */
.aelc-cards-dots {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    justify-content: center;
}

.aelc-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--aelc-border);
    cursor: pointer;
    transition: all var(--aelc-transition);
}

.aelc-dot.active {
    background: var(--aelc-primary);
    transform: scale(1.3);
}

/* ---- 测试题区 ---- */
.aelc-test-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--aelc-border);
}

.aelc-test-progress {
    font-size: 13px;
    font-weight: 600;
    color: var(--aelc-text);
}

.aelc-test-content { margin-bottom: 14px; }

.aelc-question-wrap {
    background: var(--aelc-surface);
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius);
    padding: 18px 20px;
    box-shadow: var(--aelc-shadow-sm);
}

.aelc-question-type {
    font-size: 11px;
    font-weight: 700;
    color: var(--aelc-primary);
    background: var(--aelc-primary-light);
    border: 1px solid var(--aelc-border);
    padding: 2px 10px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.aelc-question-text {
    font-size: 15px;
    font-weight: 600;
    color: var(--aelc-text);
    line-height: 1.6;
    margin-bottom: 14px;
}

/* 选择题选项 */
.aelc-options-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.aelc-option {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
    border: 2px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    cursor: pointer;
    transition: all var(--aelc-transition);
    background: var(--aelc-surface);
}

.aelc-option:hover { border-color: var(--aelc-primary); background: var(--aelc-primary-light); }

.aelc-option.selected { border-color: var(--aelc-primary); background: var(--aelc-primary-light); }
.aelc-option.correct  { border-color: var(--aelc-success); background: var(--aelc-success-light); }
.aelc-option.wrong    { border-color: var(--aelc-danger);  background: var(--aelc-danger-light); }

.option-letter {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--aelc-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
    color: var(--aelc-text);
}

.aelc-option.selected .option-letter { background: var(--aelc-primary); color: #fff; }
.aelc-option.correct  .option-letter { background: var(--aelc-success); color: #fff; }
.aelc-option.wrong    .option-letter { background: var(--aelc-danger);  color: #fff; }

.option-text {
    font-size: 14px;
    color: var(--aelc-text);
    line-height: 1.5;
}

/* 填空题/翻译题输入框 */
.aelc-fill-input {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    font-size: 14px;
    background: var(--aelc-surface);
    color: var(--aelc-text);
    box-sizing: border-box;
    outline: none;
    transition: border-color var(--aelc-transition), box-shadow var(--aelc-transition);
    font-family: inherit;
    resize: vertical;
}

.aelc-fill-input:focus {
    border-color: var(--aelc-primary);
    box-shadow: 0 0 0 3px rgba(29,111,164,.12);
}

.aelc-fill-input.correct { border-color: var(--aelc-success); background: var(--aelc-success-light); }
.aelc-fill-input.wrong   { border-color: var(--aelc-danger);  background: var(--aelc-danger-light); }

/* 答题反馈 */
.aelc-feedback {
    margin-top: 12px;
    padding: 10px 14px;
    border-radius: var(--aelc-radius-sm);
    font-size: 13px;
    line-height: 1.6;
    animation: aelcFadeIn 0.25s ease;
}

.aelc-feedback.correct {
    background: var(--aelc-success-light);
    border: 1px solid var(--aelc-success);
    color: var(--aelc-success);
}

.aelc-feedback.wrong {
    background: var(--aelc-danger-light);
    border: 1px solid var(--aelc-danger);
    color: var(--aelc-danger);
}

.feedback-answer {
    font-weight: 700;
    margin-top: 4px;
}

.aelc-test-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

/* 测试结果 */
.aelc-test-result {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
    gap: 12px;
    background: var(--aelc-surface);
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius);
    box-shadow: var(--aelc-shadow-sm);
}

.result-icon  { font-size: 56px; animation: aelcFloat 3s ease-in-out infinite; }
.result-title { font-size: 22px; font-weight: 700; color: var(--aelc-text); }
.result-detail { font-size: 14px; color: var(--aelc-text-muted); line-height: 1.7; }
.result-btns  { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 8px; }

/* ---- 加载遮罩 ---- */
.aelc-loading {
    position: absolute;
    inset: 0;
    background: rgba(var(--aelc-bg-rgb, 240,248,255), .9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    gap: 12px;
}

.aelc-dark .aelc-loading { background: rgba(9,24,34,.92); }

.loading-icon   { font-size: 40px; animation: aelcFloat 2s ease-in-out infinite; }
.loading-title  { font-size: 16px; font-weight: 700; color: var(--aelc-text); }
.loading-hint   { font-size: 13px; color: var(--aelc-text-muted); }

/* 加载省略号动画 */
@keyframes aelcDot {
    0%, 80%, 100% { opacity: 0; }
    40%           { opacity: 1; }
}

.aelc-dots span { animation: aelcDot 1.4s infinite; }
.aelc-dots span:nth-child(2) { animation-delay: 0.2s; }
.aelc-dots span:nth-child(3) { animation-delay: 0.4s; }

.aelc-cancel-btn {
    padding: 7px 16px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    background: var(--aelc-surface);
    color: var(--aelc-text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--aelc-transition);
}

.aelc-cancel-btn:hover { border-color: var(--aelc-danger); color: var(--aelc-danger); }

/* ---- Toast 通知 ---- */
.aelc-toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(15,45,66,.92);
    color: #fff;
    padding: 10px 22px;
    border-radius: 24px;
    font-size: 14px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 9999;
    max-width: 380px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,.3);
}

.aelc-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.aelc-toast.success { background: rgba(5,150,105,.92); }
.aelc-toast.error   { background: rgba(220,38,38,.92); }
.aelc-toast.warning { background: rgba(217,119,6,.92); }

/* ---- 弹框 ---- */
.aelc-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.45);
    z-index: 9000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

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

.aelc-modal-content {
    background: var(--aelc-surface);
    border-radius: var(--aelc-radius);
    width: 100%;
    max-width: 580px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--aelc-shadow-lg);
}

.aelc-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--aelc-border);
}

.aelc-modal-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--aelc-text);
}

.aelc-modal-close {
    border: none;
    background: transparent;
    font-size: 16px;
    cursor: pointer;
    color: var(--aelc-text-muted);
    padding: 4px;
    border-radius: 4px;
    transition: color var(--aelc-transition);
}

.aelc-modal-close:hover { color: var(--aelc-danger); }

.aelc-modal-body {
    padding: 16px 20px 20px;
}

.aelc-modal-hint {
    font-size: 13px;
    color: var(--aelc-text-muted);
    margin-bottom: 12px;
}

.aelc-template-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.aelc-template-item {
    padding: 12px 14px;
    border: 1px solid var(--aelc-border);
    border-radius: var(--aelc-radius-sm);
    cursor: pointer;
    transition: all var(--aelc-transition);
    background: var(--aelc-bg);
}

.aelc-template-item:hover {
    border-color: var(--aelc-primary);
    background: var(--aelc-primary-light);
}

.template-item-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--aelc-text);
    margin-bottom: 3px;
}

.template-item-desc {
    font-size: 11px;
    color: var(--aelc-text-muted);
}

/* ---- 全屏模式 ---- */
.aelc-fullscreen {
    position: fixed;
    inset: 0;
    z-index: 8000;
    border-radius: 0 !important;
}

/* ---- 字数计数器预警色 ---- */
#wordListCount.warn  { color: var(--aelc-warning); font-weight: 700; }
#wordListCount.error { color: var(--aelc-danger);  font-weight: 700; }

/* ---- 测试进度条 ---- */
.aelc-test-progress-wrap {
    height: 4px;
    background: var(--aelc-border);
    border-radius: 2px;
    margin-bottom: 16px;
    overflow: hidden;
}

.aelc-test-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--aelc-primary), #0ea5e9);
    border-radius: 2px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
}

/* Tab内容滚动条 */
.aelc-tab-content::-webkit-scrollbar {
    width: 4px;
}
.aelc-tab-content::-webkit-scrollbar-track {
    background: transparent;
}
.aelc-tab-content::-webkit-scrollbar-thumb {
    background: var(--aelc-border);
    border-radius: 2px;
}
.aelc-tab-content::-webkit-scrollbar-thumb:hover {
    background: var(--aelc-primary);
}

@keyframes aelcFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.aelc-option.correct {
    animation: aelcFadeIn 0.2s ease;
}

.aelc-option.wrong {
    animation: aelcFadeIn 0.2s ease;
}

/* 卡片切换按钮押下效果 */
.aelc-nav-btn:active:not(:disabled) {
    transform: scale(0.96);
}

.aelc-btn:active {
    transform: scale(0.97);
}

/* ---- disabled 按钮 hover 效果锁定 ---- */
.aelc-btn:disabled,
.aelc-btn-toolbar:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ---- 动态按钮入场动画 ---- */
.aelc-dynamic-btn {
    animation: aelcFadeIn 0.25s ease;
}

/* ---- 响应式 ---- */
@media (max-width: 900px) {
    .aelc-main {
        grid-template-columns: 1fr;
    }

    .aelc-history-panel {
        display: none;
    }
}

/* 小屏隐藏快捷键提示（项目规范） */
@media (max-width: 640px) {
    .shortcut-hint,
    .aelc-shortcut-tip {
        display: none;
    }

    .aelc-card-word {
        font-size: 24px;
    }

    .aelc-card-front,
    .aelc-card-back {
        padding: 16px 18px;
    }

    .aelc-tab-bar {
        padding: 0 4px;
        gap: 0;
    }

    .aelc-tab {
        padding: 8px 12px;
        font-size: 12px;
    }
}