/* ===================== Apple Flow 弹窗系统 ===================== */

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal[style*="display: flex"] {
    opacity: 1;
}

.modal-content {
    background: var(--bg-card);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    width: 90%;
    max-width: 560px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    max-height: 85vh;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    animation: modalIn 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes modalIn {
    from { transform: scale(0.95) translateY(10px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: rgba(255, 255, 255, 0.02);
}

/* ===================== 书籍信息卡片 ===================== */

.book-info {
    display: flex;
    gap: 20px;
    padding: 16px;
    background: var(--bg-body);
    border-radius: 12px;
    margin-bottom: 24px;
}

.book-cover {
    width: 70px;
    height: 98px;
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.book-details {
    flex: 1;
}

.book-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 4px 0;
}

.book-author {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0 0 8px 0;
}

.book-abstract {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-chapters {
    font-size: 12px;
    font-weight: 500;
    color: var(--primary);
    margin-top: 8px;
}

/* ===================== 章节选择 ===================== */

.chapter-selection h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.chapter-range {
    display: flex;
    gap: 4px;
    background: var(--bg-input);
    padding: 4px;
    border-radius: 10px;
    margin-bottom: 16px;
}

.chapter-range label {
    flex: 1;
    text-align: center;
    padding: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.chapter-range input[type="radio"] {
    display: none;
}

.chapter-range label:has(input:checked) {
    background: #fff;
    color: var(--text-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    font-weight: 500;
}

/* Dark mode adjustment */
@media (prefers-color-scheme: dark) {
    .chapter-range label:has(input:checked) {
        background: #3a3a3c;
    }
}

.chapter-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.input-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-row label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.chapter-select {
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-body);
    color: var(--text-primary);
    font-size: 13px;
    outline: none;
    transition: all 0.2s;
}

.chapter-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.1);
}

/* 手动选择模式 */
.chapter-manual-container {
    margin-top: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.chapter-actions {
    padding: 8px 12px;
    background: var(--bg-input);
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    align-items: center;
}

.chapter-list {
    max-height: 240px;
    overflow-y: auto;
    padding: 8px;
    background: var(--bg-body);
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 8px;
}

.chapter-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

.chapter-item:hover {
    background: var(--bg-input);
}

.chapter-item input[type="checkbox"] {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
}

.chapter-item span {
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ===================== 更新弹窗 ===================== */

.update-info p {
    margin-bottom: 8px;
    font-size: 13px;
}

.update-description {
    margin-top: 16px;
    padding: 16px;
    background: var(--bg-input);
    border-radius: 12px;
    font-size: 13px;
    line-height: 1.6;
    max-height: 200px;
    overflow-y: auto;
}

.version-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
}

.version-option {
    display: flex;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    gap: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.version-option:hover {
    background: var(--bg-input);
    border-color: var(--primary);
}

.version-option.recommended {
    border-color: var(--primary);
    background: rgba(0, 122, 255, 0.05);
}

.version-option input {
    margin-top: 2px;
    accent-color: var(--primary);
}