/* ========================================
   信件详情页 - PC端样式
   ======================================== */
body { background-color: var(--color-bg-body); }

/* 整体容器 */
.letter-detail-container {
    width: 100%;
    max-width: 100%;
    padding: 1rem;
    background: transparent;
}

.letter-wrapper {
    max-width: 720px;
    margin: 0 auto;
    background: transparent;
}

/* 统一容器 - 信件+评论+相关信件共用 */
.letter-unified-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-card);
}

/* 信件主体 */
.letter-main {
    background: transparent;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
}

/* 返回栏 */
.letter-back-bar {
    margin-bottom: 14px;
    text-align: left;
}
.letter-back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #888;
    font-size: 14px;
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 20px;
    background: #f5f5f7;
    transition: all 0.2s ease;
}
.letter-back-link:hover {
    background: var(--color-primary-hover-bg);
    color: var(--color-primary);
}

/* 信件标题 - 居中强调 */
.letter-title {
    font-family: "Noto Serif SC", "ZCOOL XiaoWei", "SimSun", serif;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.4;
    text-align: center;
    border-bottom: none;
}
/* 标题在信纸外部（原位置） */
.letter-title:not(.letter-title-inline) {
    font-size: 1.8rem;
    margin-bottom: 16px;
    padding-bottom: 0;
}
/* 标题在信纸内部，对齐 32px 横线网格 */
.letter-body .letter-title-inline {
    font-family: "Noto Serif SC", "KaiTi", "STKaiti", serif;
    font-size: 1.8rem;
    line-height: 32px !important;
    margin: 0 0 32px !important;
    padding-top: 0;
}

/* 信纸底部时间信息，对齐 32px 横线网格 */
.letter-time-inline {
    margin-top: 32px;
    padding-top: 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0;
}
.time-inline-item {
    font-size: 13px;
    color: #999;
    line-height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}
.time-inline-item i {
    font-size: 14px;
    color: #b8a898;
}

/* 投递状态标签（内联辅助信息） */
.letter-status-badge-row {
    display: none;
}
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    padding: 1px 8px;
    border-radius: 9999px;
    font-size: 10px;
    font-weight: 500;
    cursor: default;
    user-select: none;
    line-height: 1.4;
    letter-spacing: 0.3px;
}
.status-icon { font-size: 10px; line-height: 1; }
.status-delivered {
    background: rgba(144, 238, 144, 0.15);
    color: #3a8a5e;
    border: 1px solid rgba(144, 238, 144, 0.4);
}
.status-pending {
    background: rgba(255, 193, 7, 0.12);
    color: #9e7a00;
    border: 1px solid rgba(255, 193, 7, 0.3);
}
.status-waiting {
    background: rgba(100, 181, 246, 0.12);
    color: #1a6fa0;
    border: 1px solid rgba(100, 181, 246, 0.3);
}
.status-share {
    background: rgba(206, 147, 216, 0.12);
    color: #7b1fa2;
    border: 1px solid rgba(206, 147, 216, 0.3);
    cursor: pointer;
}
.status-share:hover {
    background: rgba(206, 147, 216, 0.2);
}
.status-public {
    background: rgba(144, 238, 144, 0.15);
    color: #3a8a5e;
    border: 1px solid rgba(144, 238, 144, 0.4);
}

/* 标题分隔线 */
.letter-title-divider {
    width: 60px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    margin: 0 auto 20px;
}

/* 信件头部 - 元信息 */
.letter-header { margin-bottom: 24px; }

.letter-meta-row {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 14px;
    font-size: 0.88rem;
    color: #888;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

/* 发件人头像行 */
.letter-sender-avatar-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 14px;
}
.sender-avatar-img,
.sender-avatar-initial {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
}
.sender-avatar-initial {
    background: linear-gradient(135deg, #7ab2d3, #a78bfa);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}

/* 时间轴展示 */
.letter-time-row {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    padding: 12px 16px;
    background: #f8f9fa;
    border-radius: 10px;
    margin: 0 0 4px;
}
.time-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    color: #555;
}
.time-icon { font-size: 14px; line-height: 1; }
.time-label { color: #999; margin-right: 2px; }
.time-value { font-weight: 500; color: #333; }

/* 信件内容 - 信纸纹理 + 沉浸排版 - 改造方案6.1增强版 */
.letter-body {
    font-family: "Noto Serif SC", "KaiTi", "STKaiti", serif;
    font-size: 17px;
    line-height: 2;
    letter-spacing: 0.5px;
    color: #3d3d3d;
    word-wrap: break-word;
    overflow-wrap: break-word;
    padding: 24px 28px;
    margin: 0 auto;
    max-width: 680px;
    
    /* 增强版信纸效果 - 改造方案 */
    background-color: #faf6ef !important;
    background-image: 
        repeating-linear-gradient(
            rgba(180, 170, 150, 0.35) 0px 1px,
            transparent 1px 31px,
            rgba(180, 170, 150, 0.35) 31px 32px
        ) !important;
    background-size: 100% 32px !important;
    background-position: 0 24px !important;
    background-repeat: repeat-y;
    line-height: 32px;
    
    /* 顶部渐变 - 信纸边缘感 */
    box-shadow: 
        inset 0 2px 8px rgba(0,0,0,0.03),
        0 2px 8px rgba(0,0,0,0.05) !important;
    
    /* 四周压印效果 */
    border-radius: 4px;
    border: 1px solid rgba(200, 190, 170, 0.3);
    
    /* 稿纸效果：左侧红色竖线 */
    border-left: 3px solid #c9a96e;
}

/* 顶部渐变遮罩 */
.letter-body-wrap { position: relative; }
.letter-body-wrap::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.95), transparent);
    z-index: 2;
    pointer-events: none;
}

/* 富文本区域专用样式——与信纸纹理同步 */
.rich-text-content {
    position: relative;
}
/* 纸张纹理叠加 */
.rich-text-content::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='200' height='200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    background-size: 200px 200px;
    pointer-events: none;
    z-index: 0;
}
.rich-text-content > * {
    position: relative;
    z-index: 1;
}
.rich-text-content p {
    margin-bottom: 0;
    text-indent: 2em;
    line-height: 32px;
    min-height: 32px;
}
.rich-text-content p:first-child { text-indent: 0; }
.rich-text-content h1, .rich-text-content h2, .rich-text-content h3,
.rich-text-content h4, .rich-text-content h5, .rich-text-content h6 {
    text-indent: 0;
    margin: 1.2em 0 0.6em;
    font-weight: 600;
}
.rich-text-content ul, .rich-text-content ol {
    padding-left: 2em;
    margin-bottom: 1em;
}
.rich-text-content blockquote {
    margin: 1.5em 0;
    padding: 14px 20px;
    border-left: 4px solid #4db6ac;
    background: #f0faf7;
    border-radius: 0 6px 6px 0;
    color: #555;
    font-style: italic;
}
.rich-text-content blockquote p { text-indent: 0; margin-bottom: 0; }
.rich-text-content img { max-width: 100%; height: auto; }
.rich-text-content a { color: var(--color-primary); text-decoration: underline; }
.rich-text-content pre {
    background: #f5f5f5;
    padding: 12px;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.9rem;
}
.rich-text-content code {
    background: #f5f5f5;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9rem;
}

/* 喜欢和浏览 - 圆润可爱风格 */
.letter-actions {
    padding-top: 20px;
    margin-top: 8px;
}

.action-center {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* 点赞用户头像行 */
.likers-row {
    display: flex;
    justify-content: center;
    margin-top: 12px;
}
.likers-avatars {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
    justify-content: center;
}
.liker-avatar,
.liker-avatar-initial {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}
.liker-avatar-initial {
    background: linear-gradient(135deg, #7ab2d3, #a78bfa);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
}
.liker-more {
    font-size: 11px;
    color: #999;
    margin-left: 2px;
    font-weight: 500;
}

.btn-like {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    border-radius: 9999px;
    border: 1.5px solid var(--color-border);
    background: var(--color-bg-body);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.25s ease;
}
.btn-like:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-light);
    transform: scale(1.04);
}
.btn-like.liked {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}
.btn-like.liked .fa-thumbs-up { animation: thumbUp 0.4s ease; }

@keyframes thumbUp {
    0% { transform: scale(1); }
    50% { transform: scale(1.25); }
    100% { transform: scale(1); }
}

.view-count {
    color: var(--color-text-placeholder);
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

/* 评论区域 - 与信件共用容器 */
.comment-section {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #f0f0f0;
}

.comment-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.comment-num { font-weight: 400; color: #999; }

/* 评论表单 - 嵌入卡片，无独立背景 */
.comment-form-box {
    padding: 16px 0 0;
    margin-bottom: 0;
}

.comment-input-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.comment-textarea {
    flex: 1;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 0.95rem;
    resize: none;
    transition: all 0.3s ease;
    min-height: 60px;
    color: #333;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.comment-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}

.comment-helper {
    font-size: 12px;
    color: #999;
    margin-top: 8px;
    text-align: right;
}

/* 报错提示 */
.error-tip {
    font-size: 12px;
    color: #e74c3c;
    margin-top: 6px;
    padding-left: 2px;
    animation: tipSlideIn 0.25s ease;
}
@keyframes tipSlideIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn-submit {
    position: relative;
    overflow: hidden;
    background: var(--color-primary);
    border: none;
    color: #fff;
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    box-shadow: var(--shadow-btn-sm);
    min-height: 44px;
    line-height: 1;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn-heavy);
    color: #fff;
    background: var(--color-primary-dark);
}

.btn-submit:disabled { opacity: 0.7; transform: none; }

/* 评论列表 - 卡片化 */
.comment-list { margin-top: 16px; }

.empty-comment {
    text-align: center;
    padding: 40px 20px;
    color: #999;
}

.empty-comment i {
    font-size: 2rem;
    margin-bottom: 10px;
    display: block;
    color: #ccc;
}

.comment-item {
    padding: 18px;
    margin-bottom: 10px;
    border-radius: 10px;
    background: #f8f9fa;
    border-bottom: none;
    transition: background 0.2s ease;
}

.comment-item:hover { background: #f5f5f7; }
.comment-item:last-child { margin-bottom: 0; }

.comment-author-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.comment-author {
    font-weight: 600;
    color: #1a1a1a;
    font-size: 0.95rem;
}

/* 评论头像 */
.comment-avatar,
.comment-avatar-initial {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    flex-shrink: 0;
    object-fit: cover;
}
.comment-avatar-initial {
    background: linear-gradient(135deg, #7ab2d3, #a78bfa);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

.comment-time {
    color: #999;
    font-size: 0.85rem;
}

.comment-content {
    color: #444;
    line-height: 1.7;
    font-size: 0.95rem;
    flex: 1;
}

.comment-body-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
}

.comment-like-wrap {
    flex-shrink: 0;
    padding-top: 4px;
}

.comment-like-wrap .btn-like-comment { padding: 4px 8px; }
.comment-like-wrap .fa-thumbs-up { font-size: 0.9rem; }
.comment-like-wrap .like-num { font-size: 0.8rem; margin-left: 2px; }

.comment-actions {
    display: flex;
    gap: 16px;
}

.btn-action {
    background: none;
    border: none;
    color: #999;
    font-size: 0.85rem;
    cursor: pointer;
    padding: 4px 8px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color 0.2s ease;
}

.btn-action:hover { color: var(--color-primary); }
.btn-like-comment.liked { color: var(--color-primary); }
.btn-like-comment.liked .fa-thumbs-up { color: var(--color-primary); }

/* 回复列表样式 */
.reply-list {
    margin-left: 20px;
    margin-top: 12px;
    padding-left: 16px;
    border-left: 2px solid #e8e8e8;
}

.reply-item {
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
}

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

.reply-author-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.reply-author {
    font-weight: 600;
    color: #555;
    font-size: 0.9rem;
}

.reply-tag {
    background: var(--color-primary-active-bg);
    color: var(--color-primary);
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 8px;
}

.reply-time { color: #999; font-size: 0.8rem; }

.reply-content {
    color: #444;
    line-height: 1.6;
    font-size: 0.9rem;
    flex: 1;
}

.reply-body-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.reply-like-wrap {
    flex-shrink: 0;
    padding-top: 2px;
}

.reply-like-wrap .btn-like-reply { padding: 2px 6px; }
.reply-like-wrap .fa-thumbs-up { font-size: 0.85rem; }
.reply-like-wrap .like-num { font-size: 0.75rem; margin-left: 2px; }

.reply-actions { display: flex; gap: 12px; }

.btn-like-reply {
    background: none;
    border: none;
    color: #999;
    font-size: 0.8rem;
    cursor: pointer;
    padding: 2px 6px;
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.btn-like-reply:hover { color: var(--color-primary); }
.btn-like-reply.liked { color: var(--color-primary); }

/* 回复表单样式 */
.reply-form {
    margin-top: 12px;
    display: none;
}

.reply-form.active { display: block; }

.reply-input-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

.reply-textarea {
    flex: 1;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.9rem;
    resize: none;
    min-height: 50px;
    transition: all 0.3s ease;
    color: #333;
}

.reply-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus-soft);
}

.btn-reply-submit {
    background: var(--color-primary);
    border: none;
    color: #fff;
    padding: 10px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-btn-sm);
}

.btn-reply-submit:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-btn-hover);
    color: #fff;
}

.btn-reply-submit:disabled { opacity: 0.6; transform: none; }

.btn-reply-cancel {
    background: #f5f5f7;
    border: none;
    color: #666;
    padding: 10px 18px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-reply-cancel:hover { background: #eee; }

/* 相关信件 - 卡片网格 */
.related-section {
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid #f0f0f0;
}

.related-heading {
    font-size: 15px;
    font-weight: 500;
    color: #666;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.related-heading i {
    color: #f5a623;
    font-size: 16px;
}

.related-card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.related-card-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 16px;
    border-radius: 12px;
    text-decoration: none;
    background: #f8f9fa;
    border: 1px solid #f0f0ee;
    transition: all 0.25s ease;
}

.related-card-item:hover {
    background: #eef5fc;
    border-color: #d0e4f5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

.rel-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-card-item:hover .rel-card-title {
    color: var(--color-primary);
}

.rel-card-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: #999;
}

.rel-card-avatar {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #7ab2d3, #a78bfa);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 600;
    flex-shrink: 0;
    object-fit: cover;
}

.rel-card-dot {
    opacity: 0.4;
}

.rel-card-time {
    color: #bbb;
}

/* 我的信件 - 底部按钮行 */
.my-letter-footer {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    padding-top: 24px;
    border-top: 1px solid #f0f0f0;
}

.my-action-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.my-back-btn {
    background: #fff;
    border: 1.5px solid #e0e0e0;
    color: #666;
}

.my-back-btn:hover {
    background: var(--color-primary-hover-bg);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.my-public-btn {
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-btn-sm);
}

.my-public-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn-heavy);
    color: #fff;
}

/* 关键词高亮 */
mark.kw-highlight {
    background: linear-gradient(180deg, transparent 60%, rgba(255, 193, 7, 0.25) 60%);
    color: inherit;
    padding: 0 2px;
    border-radius: 2px;
}

/* 点赞 Bounce 动画 */
@keyframes likeBounce {
    0%   { transform: scale(1); }
    25%  { transform: scale(1.3); }
    50%  { transform: scale(0.9); }
    75%  { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.btn-like-comment.liked i,
.btn-like-reply.liked i {
    animation: likeBounce 0.4s ease;
    color: #ff4757 !important;
}

.btn-like-comment.liked,
.btn-like-reply.liked {
    color: #ff4757 !important;
}

/* ========================================
   右下角落款（手写字体，已移入信件内容容器内）
   ======================================== */
.letter-signature {
    text-align: right;
    margin-top: 32px;
    padding-right: 1em;
    font-family: "Zhi Mang Xing", "ZCOOL XiaoWei", "Ma Shan Zheng", cursive;
    font-size: 26px;  /* 约信件内容字体 17px 的 1.5 倍 */
    color: var(--color-primary);
    font-style: italic;
    opacity: 0.85;
}

/* ========================================
   移动端+PC端统一隐藏浮动工具栏
   ======================================== */
.reading-toolbar {
    display: none !important;
}