/* --- 基础容器 --- */
.content-container {
    padding: 0 30px;
}

.quiz-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0;
}

/* --- 头部样式 --- */
.quiz-header {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--crystal-border);
    padding: 25px 35px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.quiz-title {
    color: var(--accent-blue);
    font-size: 26px;
    font-weight: 600;
    margin: 0;
    text-shadow: 0 0 20px rgba(100, 216, 255, 0.3);
}

[data-theme="day"] .quiz-title {
    text-shadow: 0 0 10px rgba(0, 105, 217, 0.2);
}

/* --- 控制按钮区域 --- */
.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.ice-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    padding: 8px 14px;
    background: rgba(100, 200, 255, 0.08);
    border-radius: 8px;
    border: 1px solid rgba(100, 200, 255, 0.15);
    transition: all 0.3s;
}

.ice-switch:hover {
    background: rgba(100, 200, 255, 0.15);
    border-color: var(--accent-blue);
}

[data-theme="day"] .ice-switch {
    background: rgba(0, 105, 217, 0.08);
    border-color: rgba(0, 105, 217, 0.2);
}

[data-theme="day"] .ice-switch:hover {
    background: rgba(0, 105, 217, 0.15);
}

.ice-switch input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-blue);
}

.ice-switch label {
    cursor: pointer;
    user-select: none;
    font-weight: 500;
}

/* --- 卡片样式 --- */
.ice-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--crystal-border);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    position: relative;
    overflow: hidden;
}

.ice-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
    opacity: 0.5;
}

/* --- 按钮样式 --- */
.btn-ice {
    background: linear-gradient(135deg, #00bfff, #004bbb);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(100, 216, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.btn-ice:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(100, 216, 255, 0.5);
}

[data-theme="day"] .btn-ice {
    box-shadow: 0 4px 15px rgba(0, 105, 217, 0.3);
}

[data-theme="day"] .btn-ice:hover {
    box-shadow: 0 6px 20px rgba(0, 105, 217, 0.5);
}

.btn-ice.btn-ghost {
    background: rgba(100, 200, 255, 0.1);
    color: var(--accent-blue);
    border: 1px solid var(--crystal-border);
    box-shadow: none;
}

.btn-ice.btn-ghost:hover {
    background: rgba(100, 200, 255, 0.2);
    border-color: var(--accent-blue);
}

[data-theme="day"] .btn-ice.btn-ghost {
    background: rgba(0, 105, 217, 0.08);
}

[data-theme="day"] .btn-ice.btn-ghost:hover {
    background: rgba(0, 105, 217, 0.15);
}

.btn-ice.btn-primary {
    width: 100%;
    height: 52px;
    font-size: 16px;
}

/* --- 上传区域 --- */
.ice-upload-icon {
    font-size: 90px;
    margin-bottom: 25px;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(100, 216, 255, 0.5));
}

[data-theme="day"] .ice-upload-icon {
    filter: drop-shadow(0 0 15px rgba(0, 105, 217, 0.3));
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.upload-status {
    margin-top: 25px;
    font-size: 15px;
    color: var(--accent-blue);
    text-align: center;
    font-weight: 500;
}

#uploadArea {
    min-height: 350px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* --- 进度卡片 --- */
.progress-card {
    padding: 22px 35px !important;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 14px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.progress-text, .score-text {
    color: var(--text-primary);
}

.ice-badge {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    padding: 5px 14px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
    margin-left: 12px;
    box-shadow: 0 2px 8px rgba(100, 216, 255, 0.3);
}

/* --- 进度条 --- */
.ice-progress {
    height: 10px;
    background: rgba(100, 200, 255, 0.15);
    border-radius: 5px;
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

[data-theme="day"] .ice-progress {
    background: rgba(0, 105, 217, 0.15);
}

.ice-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    width: 0%;
    transition: width 0.5s ease;
    box-shadow: 0 0 10px var(--accent-blue);
}

/* --- 题目显示 --- */
.question-card {
    padding: 40px !important;
}

.q-header {
    display: flex;
    margin-bottom: 28px;
    align-items: flex-start;
}

.ice-num {
    background: linear-gradient(135deg, #1787fb, #7bc1de);
    color: #fff;
    min-width: 38px;
    height: 38px;
    border-radius: 19px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
    font-weight: bold;
    padding: 0 16px;
    gap: 10px;
    box-shadow: 0 4px 15px rgba(100, 216, 255, 0.3);
}

.ice-tag {
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.35);
    color: white;
    font-weight: 600;
}

.q-text {
    font-size: 18px;
    font-weight: 500;
    line-height: 1.8;
    white-space: pre-wrap;
    flex: 1;
    overflow-x: auto;
    color: var(--text-primary);
}

/* --- 代码块样式 --- */
.code-block {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background: rgba(100, 200, 255, 0.05);
    padding: 15px;
    border-radius: 10px;
    border: 1px solid var(--crystal-border);
    display: block;
    margin: 15px 0;
    white-space: pre;
    overflow-x: auto;
    color: var(--text-primary);
    font-size: 15px;
}

[data-theme="day"] .code-block {
    background: rgba(0, 105, 217, 0.05);
}

/* --- 嵌入式填空 --- */
.gap-input-embedded {
    border: none;
    border-bottom: 2px solid var(--accent-blue);
    background: transparent;
    padding: 2px 8px;
    margin: 0 4px;
    min-width: 70px;
    text-align: center;
    font-family: inherit;
    font-size: 18px;
    color: var(--accent-blue);
    outline: none;
    transition: all 0.3s;
    font-weight: 600;
}

.gap-input-embedded:focus {
    background: rgba(100, 200, 255, 0.08);
}

[data-theme="day"] .gap-input-embedded:focus {
    background: rgba(0, 105, 217, 0.08);
}

.gap-input-embedded.correct {
    border-bottom-color: #4ade80;
    color: #22c55e;
}

.gap-input-embedded.wrong {
    border-bottom-color: #f87171;
    color: #ef4444;
}

/* --- 上下文框 --- */
.ice-context {
    background: rgba(100, 200, 255, 0.08);
    padding: 22px 28px;
    border-radius: 12px;
    border-left: 5px solid var(--accent-blue);
    margin-bottom: 32px;
    max-height: 350px;
    overflow-y: auto;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    white-space: pre-wrap;
}

[data-theme="day"] .ice-context {
    background: rgba(0, 105, 217, 0.08);
}

/* --- 词库区域 --- */
.ice-word-bank {
    margin-top: 28px;
    padding: 22px;
    background: rgba(100, 200, 255, 0.08);
    border: 2px dashed var(--crystal-border);
    border-radius: 12px;
}

[data-theme="day"] .ice-word-bank {
    background: rgba(0, 105, 217, 0.08);
}

.word-bank-title {
    font-size: 15px;
    font-weight: bold;
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.word-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.word-chip {
    padding: 9px 18px;
    background: var(--card-bg);
    border: 2px solid var(--accent-blue);
    color: var(--accent-blue);
    border-radius: 8px;
    cursor: grab;
    user-select: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(100, 216, 255, 0.15);
}

.word-chip:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(100, 216, 255, 0.3);
    background: rgba(100, 200, 255, 0.1);
}

[data-theme="day"] .word-chip:hover {
    background: rgba(0, 105, 217, 0.1);
}

.word-chip.dragging {
    opacity: 0.6;
    background: rgba(100, 200, 255, 0.2);
}

.word-chip.used {
    background: rgba(100, 100, 100, 0.1);
    border-color: rgba(150, 150, 150, 0.3);
    color: var(--text-secondary);
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* --- 拖放区域 --- */
.drop-zone {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 90px;
    height: 34px;
    margin: 0 6px;
    padding: 0 12px;
    vertical-align: middle;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 15px;
    font-weight: 600;
}

.drop-zone.empty {
    background: rgba(255, 251, 230, 0.3);
    border: 2px dashed rgba(234, 179, 8, 0.5);
    color: #ca8a04;
    font-weight: normal;
}

[data-theme="day"] .drop-zone.empty {
    background: rgba(255, 251, 230, 0.5);
}

.drop-zone.filled {
    background: rgba(100, 200, 255, 0.15);
    border: 2px solid var(--accent-blue);
    color: var(--accent-blue);
}

[data-theme="day"] .drop-zone.filled {
    background: rgba(0, 105, 217, 0.15);
}

.drop-zone.correct {
    background: rgba(240, 253, 244, 0.3);
    border-color: #4ade80;
    color: #22c55e;
}

[data-theme="day"] .drop-zone.correct {
    background: rgba(240, 253, 244, 0.5);
}

.drop-zone.wrong {
    background: rgba(254, 242, 242, 0.3);
    border-color: #f87171;
    color: #ef4444;
}

[data-theme="day"] .drop-zone.wrong {
    background: rgba(254, 242, 242, 0.5);
}

/* --- 输入框样式 --- */
.bottom-input-group {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 22px;
}

.bottom-input {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--crystal-border);
    border-radius: 10px;
    font-size: 16px;
    outline: none;
    font-family: 'Consolas', monospace;
    transition: all 0.3s;
    background: var(--card-bg);
    color: var(--text-primary);
}

.bottom-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

[data-theme="day"] .bottom-input:focus {
    box-shadow: 0 0 0 3px rgba(0, 105, 217, 0.1);
}

.bottom-input.correct {
    border-color: #4ade80;
    background: rgba(240, 253, 244, 0.3);
}

[data-theme="day"] .bottom-input.correct {
    background: rgba(240, 253, 244, 0.5);
}

.bottom-input.wrong {
    border-color: #f87171;
    background: rgba(254, 242, 242, 0.3);
}

[data-theme="day"] .bottom-input.wrong {
    background: rgba(254, 242, 242, 0.5);
}

.essay-textarea {
    width: 100%;
    min-height: 150px;
    padding: 18px;
    border: 2px solid var(--crystal-border);
    border-radius: 12px;
    font-size: 16px;
    font-family: inherit;
    resize: vertical;
    outline: none;
    transition: all 0.3s;
    line-height: 1.7;
    margin-top: 16px;
    background: var(--card-bg);
    color: var(--text-primary);
}

.essay-textarea:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

[data-theme="day"] .essay-textarea:focus {
    box-shadow: 0 0 0 3px rgba(0, 105, 217, 0.1);
}

/* --- 选项样式 --- */
.option {
    border: 2px solid var(--crystal-border);
    padding: 16px 20px;
    margin-bottom: 16px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--card-bg);
    font-size: 15px;
    color: var(--text-primary);
}

.option:hover {
    background: rgba(100, 200, 255, 0.1);
    border-color: var(--accent-blue);
    transform: translateX(4px);
}

[data-theme="day"] .option:hover {
    background: rgba(0, 105, 217, 0.1);
}

.option.selected {
    background: rgba(100, 200, 255, 0.15);
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.1);
}

[data-theme="day"] .option.selected {
    background: rgba(0, 105, 217, 0.15);
    box-shadow: 0 0 0 3px rgba(0, 105, 217, 0.1);
}

.option.correct {
    background: rgba(240, 253, 244, 0.3) !important;
    border-color: #4ade80 !important;
    color: #22c55e;
    font-weight: 600;
}

[data-theme="day"] .option.correct {
    background: rgba(240, 253, 244, 0.5) !important;
}

.option.wrong {
    background: rgba(254, 242, 242, 0.3) !important;
    border-color: #f87171 !important;
    color: #ef4444;
}

[data-theme="day"] .option.wrong {
    background: rgba(254, 242, 242, 0.5) !important;
}

/* --- 操作按钮区域 --- */
.action-area {
    margin-top: 32px;
}

.action-buttons {
    display: flex !important;
    gap: 14px;
    margin-top: 18px;
}

#actionBtns {
    display: flex !important;
}

.action-buttons .btn-ice {
    flex: 1;
    height: 50px;
}

/* --- 结果信息 --- */
.ice-result {
    margin-top: 28px;
    padding: 22px;
    border-radius: 12px;
    background: rgba(100, 200, 255, 0.08);
    border-left: 5px solid var(--accent-blue);
    box-shadow: 0 4px 16px rgba(100, 216, 255, 0.1);
}

[data-theme="day"] .ice-result {
    background: rgba(0, 105, 217, 0.08);
}

.result-status {
    font-weight: bold;
    margin-bottom: 12px;
    font-size: 16px;
    color: var(--text-primary);
}

.answer-reference {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* --- 答题卡 --- */
.record-card {
    padding: 30px !important;
}

.ice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
    gap: 12px;
    margin-top: 20px;
}

.record-dot {
    height: 48px;
    border-radius: 10px;
    background: rgba(100, 200, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid var(--crystal-border);
    color: var(--text-primary);
}

[data-theme="day"] .record-dot {
    background: rgba(0, 105, 217, 0.1);
}

.record-dot:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(100, 216, 255, 0.2);
}

.record-dot.correct {
    background: linear-gradient(135deg, #4ade80, #22c55e);
    color: white;
    box-shadow: 0 4px 12px rgba(74, 222, 128, 0.3);
    border-color: transparent;
}

.record-dot.wrong {
    background: linear-gradient(135deg, #f87171, #ef4444);
    color: white;
    box-shadow: 0 4px 12px rgba(248, 113, 113, 0.3);
    border-color: transparent;
}

.record-dot.current {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(100, 200, 255, 0.2);
    font-weight: bold;
}

[data-theme="day"] .record-dot.current {
    box-shadow: 0 0 0 3px rgba(0, 105, 217, 0.2);
}

/* --- 通用工具类 --- */
.hidden {
    display: none !important;
}

.text-gap-line {
    display: inline-block;
    min-width: 70px;
    border-bottom: 2px solid var(--accent-blue);
    margin: 0 6px;
    vertical-align: bottom;
    height: 22px;
}

/* 背题模式：简答题参考答案块 */
.ref-ans-block {
    white-space: pre-wrap;
    line-height: 1.9;
    color: #333;
    font-size: 14px;
    background: #f9f9f9;
    padding: 12px 15px;
    border-radius: 6px;
    border-left: 3px solid #1890ff;
    margin-top: 6px;
}

/* --- 响应式设计 --- */
@media (max-width: 768px) {
    .content-container {
        padding: 15px 10px;
    }
    
    .quiz-header {
        padding: 18px 22px;
    }
    
    .quiz-title {
        font-size: 22px;
        width: 100%;
        margin-bottom: 12px;
    }
    
    .header-controls {
        width: 100%;
        justify-content: flex-start;
    }
    
    .ice-card {
        padding: 25px;
    }
    
    .question-card {
        padding: 30px !important;
    }
    
    .ice-grid {
        grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
    }
    
    .ice-upload-icon {
        font-size: 70px;
    }
    
    #uploadArea {
        min-height: 300px;
    }
}

@media (max-width: 480px) {
    .quiz-header {
        padding: 15px 18px;
    }
    
    .quiz-title {
        font-size: 20px;
    }
    
    .ice-card {
        padding: 20px;
    }
    
    .header-controls {
        gap: 10px;
    }
    
    .ice-switch {
        font-size: 13px;
        padding: 6px 10px;
    }
}