:root {
    /* 莫兰蒂色系配色方案 */
    --primary-color: #8796A1; /* 雾霾蓝 */
    --background-color: #F2F0ED; /* 燕麦色/暖灰 */
    --secondary-color: #B4A39B; /* 灰粉色 */
    --text-color: #4A4A4A; /* 深灰木色 */
    --card-color: #FCFAF8; /* 奶油色 */
    --danger-color: #A38D8D; /* 干枯玫瑰红 */
    --border-color: #E5E1DC; /* 浅色边框 */
    --shadow: 0 10px 30px rgba(0,0,0,0.03); /* 细腻扩散阴影 */
    --border-radius: 12px; /* 圆角 */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

header {
    background: var(--primary-color);
    color: white;
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
}

nav {
    margin-top: 1rem;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 1rem;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

section {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

h2 {
    margin-bottom: 2rem;
    color: var(--text-color);
    font-size: 1.8rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: bold;
    color: var(--text-color);
}

select, input, textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: all 0.3s ease;
}

select:focus, input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(135, 150, 161, 0.1);
}

/* 管理员回复输入框样式 */
.message-reply textarea {
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 120px;
    padding: 1rem;
    font-size: 0.95rem;
    color: var(--text-color);
    transition: all 0.3s ease;
}

.message-reply textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(135, 150, 161, 0.1);
}

textarea {
    resize: vertical;
    min-height: 180px;
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background-color: #6C7A83;
    transform: translateY(-2px);
}

button:active {
    transform: scale(0.98);
}

.filter-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-container select {
    flex: 1;
    min-width: 200px;
}

#message-grid, #anonymous-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.message-card {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 300px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.message-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.05);
}

.message-card h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.2rem;
}

.message-card p {
    margin-bottom: 1rem;
    color: var(--text-color);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.message-meta {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

#success-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.3);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--card-color);
    padding: 3rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow);
    max-width: 400px;
    width: 90%;
    border: 1px solid var(--border-color);
}

.modal-content h3 {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.modal-content button {
    margin-top: 1.5rem;
    background-color: var(--primary-color);
}

.modal-content button:hover {
    background-color: #6C7A83;
}

footer {
    background-color: var(--card-color);
    color: var(--secondary-color);
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.form-note {
    margin: 1.5rem 0;
    padding: 1rem;
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
}

.action-buttons {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.action-buttons button {
    flex: 1;
    min-width: 150px;
    padding: 1.2rem;
    font-size: 1.1rem;
}

#leave-message-btn {
    background-color: var(--primary-color);
}

#leave-message-btn:hover {
    background-color: #6C7A83;
}

#just-browse-btn {
    background-color: var(--card-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

#just-browse-btn:hover {
    background-color: var(--border-color);
}

@media (max-width: 768px) {
    main {
        padding: 0.5rem 0.5rem;
    }
    
    /* 苹果设备安全区域适配 */
    @supports (padding: max(0px)) {
        main {
            padding-left: max(0.5rem, env(safe-area-inset-left));
            padding-right: max(0.5rem, env(safe-area-inset-right));
            padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
        }
    }
    
    section {
        padding: 0.75rem;
    }
    
    #message-grid, #anonymous-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .message-card {
        padding: 0.5rem;
        /* aspect-ratio: 1 / 1.3; */
        display: flex;
        flex-direction: column;
        border-radius: 8px;
        height: 250px;
        overflow: hidden;
    }
    
    .message-item {
        padding: 1.25rem;
    }
    
    .message-card h3 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }
    
    .message-card p {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
        flex: 1;
    }
    
    .message-meta {
        font-size: 0.8rem;
        margin-top: 0.75rem;
        padding-top: 0.75rem;
    }
    
    .filter-container {
        flex-direction: column;
    }
    
    .filter-container select {
        width: 100%;
        padding: 0.75rem;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .action-buttons button {
        width: 100%;
        padding: 1rem;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    #message-grid, #anonymous-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    #message-grid, #anonymous-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1440px) {
    #message-grid, #anonymous-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* 管理员页面样式 */
.admin-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.admin-nav button {
    flex: 1;
    min-width: 150px;
}

.message-item {
    background-color: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.message-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.search-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.search-container input, .search-container select {
    flex: 1;
    min-width: 200px;
}

#email-management {
    margin-top: 3rem;
}

.email-list {
    margin-top: 1.5rem;
}

.email-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #F1F5F9;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.email-item:hover {
    background-color: #E2E8F0;
}

.email-form {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.email-form input {
    flex: 1;
    min-width: 300px;
}

.logout-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--danger-color);
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
}

.logout-btn:hover {
    background-color: #8C7878;
}

/* 内容库管理样式 */
#content-library {
    margin-top: 3rem;
}

.library-nav {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.library-nav button {
    flex: 1;
    min-width: 150px;
}

.library-section {
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.item-list {
    margin-top: 1.5rem;
}

.item-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #E2E8F0;
    transition: all 0.3s ease;
}

.item-row:hover {
    background-color: #F8FAFC;
}

.item-row:last-child {
    border-bottom: none;
}

.item-actions {
    display: flex;
    gap: 0.5rem;
}

.icon-btn {
    padding: 0.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.add-btn {
    background-color: #10B981;
    color: white;
}

.add-btn:hover {
    background-color: #059669;
}

.delete-btn {
    background-color: var(--danger-color);
    color: white;
}

.delete-btn:hover {
    background-color: #8C7878;
}

.edit-btn {
    background-color: var(--primary-color);
    color: white;
}

.edit-btn:hover {
    background-color: #6C7A83;
}

.item-form {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.item-form input {
    margin-bottom: 1rem;
}

.nested-list {
    margin-left: 2rem;
    margin-top: 1rem;
}

.book-item {
    margin-bottom: 1rem;
}

.chapter-item {
    margin-left: 2rem;
    margin-top: 0.5rem;
}

/* 登录页面样式 */
.login-container {
    max-width: 400px;
    margin: 5rem auto;
    padding: 3rem;
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.login-container h2 {
    text-align: center;
    margin-bottom: 2.5rem;
    color: var(--text-color);
}

.login-container button {
    width: 100%;
    margin-top: 1.5rem;
    padding: 1.1rem;
}

/* 按钮样式 */
.approve-btn {
    background-color: #10B981;
}

.approve-btn:hover {
    background-color: #059669;
}

.reject-btn {
    background-color: var(--danger-color);
}

.reject-btn:hover {
    background-color: #8C7878;
}

.hide-btn {
    background-color: #F59E0B;
}

.hide-btn:hover {
    background-color: #D97706;
}

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

.top-btn:hover {
    background-color: #6C7A83;
}

.remove-email-btn {
    background-color: var(--danger-color);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.remove-email-btn:hover {
    background-color: #8C7878;
}

/* 确认模态框样式 */
#confirm-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.3);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

/* 置顶模态框样式 */
#pin-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.3);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

/* 活跃标签样式 */
.library-nav button.active {
    background-color: var(--primary-color);
    color: white;
}

.admin-nav button.active {
    background-color: var(--primary-color);
    color: white;
}

/* 分页控件样式 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 2rem;
    gap: 1rem;
}

.pagination button {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--card-color);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.pagination button:hover:not(:disabled) {
    background-color: var(--border-color);
    border-color: var(--primary-color);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination #page-info {
    font-size: 1rem;
    color: #64748B;
    min-width: 80px;
    text-align: center;
}

/* 留言详情页面样式 */
.message-detail-card {
    height: auto !important;
    min-height: 200px;
    background-color: var(--card-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.message-detail-card p {
    overflow: visible !important;
    text-overflow: clip !important;
    display: block !important;
    -webkit-line-clamp: unset !important;
    -webkit-box-orient: unset !important;
}

.message-detail-content {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.admin-reply {
    margin-top: 2rem;
    margin-left: 1.5rem;
    padding: 1.5rem;
    background-color: #E5E1DC;
    border-left: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    position: relative;
}

.admin-reply::before {
    content: '';
    position: absolute;
    top: -1rem;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
}

.admin-reply h4 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.admin-reply h4 .admin-badge {
    background-color: var(--secondary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: normal;
}

.admin-reply-content {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #5A5A5A;
}

.admin-reply-time {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--secondary-color);
}