/* ============== 全局样式 ============== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #f5f5f5;
    --card-bg: #fff;
    --border-color: #ddd;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* ============== 导航栏 ============== */
.navbar {
    background-color: var(--secondary-color);
    color: #fff;
    padding: 15px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 20px;
}

.navbar-nav a {
    color: #fff;
    text-decoration: none;
    transition: opacity 0.3s;
}

.navbar-nav a:hover {
    opacity: 0.8;
}

.navbar-nav .active {
    border-bottom: 2px solid var(--primary-color);
}

/* ============== 按钮样式 ============== */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s;
    text-align: center;
}

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

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: #fff;
}

.btn-success {
    background-color: var(--success-color);
    color: #fff;
}

.btn-danger {
    background-color: var(--accent-color);
    color: #fff;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ============== 表单样式 ============== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

/* ============== 卡片样式 ============== */
.card {
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 20px;
}

.card-header {
    padding: 15px 20px;
    background-color: var(--secondary-color);
    color: #fff;
    font-weight: bold;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    background-color: #f8f9fa;
    border-top: 1px solid var(--border-color);
}

/* ============== 小说列表 ============== */
.novel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.novel-card {
    background-color: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.novel-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.novel-cover {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 2rem;
    font-weight: bold;
}

.novel-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.novel-info {
    padding: 15px;
}

.novel-title {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.novel-author {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 8px;
}

.novel-desc {
    font-size: 0.85rem;
    color: var(--text-light);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 10px;
}

.novel-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-light);
}

.novel-status {
    padding: 3px 8px;
    border-radius: 3px;
    font-size: 0.75rem;
}

.novel-status.ongoing {
    background-color: #e3f2fd;
    color: #1976d2;
}

.novel-status.completed {
    background-color: #e8f5e9;
    color: #388e3c;
}

/* ============== 小说详情页 ============== */
.novel-detail-header {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
}

.novel-detail-cover {
    width: 200px;
    height: 280px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 3rem;
    font-weight: bold;
}

.novel-detail-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.novel-detail-info {
    flex: 1;
}

.novel-detail-title {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--secondary-color);
}

.novel-detail-author {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 15px;
}

.novel-detail-desc {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.chapter-list {
    max-height: 500px;
    overflow-y: auto;
}

.chapter-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-color);
    transition: background-color 0.3s;
}

.chapter-item:hover {
    background-color: #f8f9fa;
}

.chapter-title {
    flex: 1;
}

.chapter-date {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ============== 阅读页面 ============== */
.read-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--card-bg);
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.read-title {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.read-nav {
    font-size: 0.9rem;
    color: var(--text-light);
}

.read-content {
    background-color: var(--card-bg);
    padding: 30px;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.read-text {
    font-size: 1.1rem;
    line-height: 2;
    text-align: justify;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.read-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
    gap: 15px;
}

.read-footer .btn {
    flex: 1;
}

/* ============== 登录页面 ============== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 40px;
}

.login-title {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: var(--secondary-color);
}

/* ============== 管理面板 ============== */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.admin-title {
    font-size: 1.8rem;
    font-weight: bold;
}

.admin-actions {
    display: flex;
    gap: 10px;
}

.novel-table {
    width: 100%;
    border-collapse: collapse;
}

.novel-table th,
.novel-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.novel-table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.novel-table tr:hover {
    background-color: #f8f9fa;
}

/* ============== 上传章节 ============== */
.chapter-upload-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.tab-button {
    padding: 10px 20px;
    background: none;
    border: none;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    font-size: 16px;
    color: var(--text-light);
    transition: all 0.3s;
}

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

.tab-content {
    display: none;
}

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

.chapter-list-input {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 10px;
}

.chapter-item-input {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.chapter-item-input:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.chapter-number-input {
    width: 80px;
}

.chapter-title-input {
    flex: 1;
}

.remove-chapter-btn {
    color: var(--accent-color);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    padding: 0 5px;
}

/* ============== 消息提示 ============== */
.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 5px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.2);
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
}

.message.success {
    background-color: var(--success-color);
    color: #fff;
}

.message.error {
    background-color: var(--accent-color);
    color: #fff;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============== 空状态 ============== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state-text {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

/* ============== 页脚 ============== */
.footer {
    background-color: var(--secondary-color);
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: auto;
}

/* ============== 移动端适配 ============== */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }

    .navbar .container {
        flex-direction: column;
        gap: 10px;
    }

    .navbar-nav {
        gap: 15px;
        font-size: 0.9rem;
    }

    .novel-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }

    .novel-cover {
        height: 160px;
    }

    .novel-info {
        padding: 10px;
    }

    .novel-title {
        font-size: 1rem;
    }

    .novel-detail-header {
        flex-direction: row;
        align-items: flex-start;
        gap: 15px;
    }

    .novel-detail-cover {
        width: 80px;
        height: 112px;
        flex-shrink: 0;
    }

    .novel-detail-info {
        min-width: 0;
        flex: 1;
    }

    .novel-detail-title {
        font-size: 1.1rem;
    }

    .novel-detail-author {
        font-size: 0.9rem;
    }

    .novel-detail-desc {
        font-size: 0.85rem;
    }

    .read-content {
        padding: 20px 15px;
    }

    .read-text {
        font-size: 1rem;
        line-height: 1.8;
    }

    .read-footer {
        flex-direction: column;
    }

    .admin-header {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
    }

    .admin-actions {
        flex-direction: column;
    }

    .novel-table {
        font-size: 0.85rem;
    }

    .novel-table th,
    .novel-table td {
        padding: 8px 5px;
    }

    .table-responsive {
        overflow-x: auto;
    }

    /* 隐藏表格中次要的列 */
    .novel-table th:nth-child(1),
    .novel-table td:nth-child(1),
    .novel-table th:nth-child(4),
    .novel-table td:nth-child(4),
    .novel-table th:nth-child(7),
    .novel-table td:nth-child(7) {
        display: none;
    }

    /* 操作按钮换行显示 */
    .novel-table td:last-child {
        display: flex;
        flex-wrap: wrap;
        gap: 5px;
    }

    .novel-table td:last-child .btn {
        flex: 1 1 auto;
        min-width: 60px;
    }

    .chapter-item-input {
        flex-direction: column;
    }

    .chapter-number-input {
        width: 100%;
    }

    .card-body {
        padding: 15px;
    }

    .message {
        left: 10px;
        right: 10px;
        top: 10px;
    }
}

@media (max-width: 480px) {
    .novel-grid {
        grid-template-columns: 1fr;
    }

    .read-title {
        font-size: 1.2rem;
    }

    .btn {
        padding: 8px 15px;
        font-size: 13px;
    }
}