/* 小说内容基础样式 */
.novel-container {
    font-family: "Microsoft Yahei", sans-serif;
    line-height: 1.8;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.novel-container p {
    margin-bottom: 1.5rem;
}

/* 原生Tooltip样式 */
.novel-tooltip {
    display: inline-block;
    position: relative;
    border-bottom: 1px dotted #4a90e2;
    cursor: help;
    color: #2c3e50;
}
.novel-tooltip .tooltip-text {
    visibility: hidden;
    width: 250px;
    background-color: #333;
    color: #fff;
    text-align: left;
    border-radius: 6px;
    padding: 0.8rem;
    position: absolute;
    z-index: 100;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.9rem;
    box-shadow: 0 3px 8px rgba(0,0,0,0.2);
}
.novel-tooltip .tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #333 transparent transparent transparent;
}
.novel-tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* 信件容器样式*/
.letter-container {
    position: relative;
    z-index: 0; /* 容器层级低于按钮 */
    background-image: url('/images/paper-texture.jpg'); /* 纸张纹理图 */
    background-size: cover; /* 纹理铺满容器 */
    background-color: #f8f5e6; /* 备用色（纹理加载失败时显示） */
    border: 1px solid #e8dcbb; /* 浅米色边框，模拟纸张边缘 */
    padding: 2rem;
    margin: 30px 0;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    min-height: 200px;
}

.letter-container:before {
    content: none;
}

/* 按钮样式 */
.reveal-btn {
    position: relative;
    z-index: 10; /* 按钮层级高于容器，避免被纹理覆盖 */
    background-image: none !important; /* 彻底移除纹理 */
    background-color: #8c6d46; /* 木质棕，贴合手写纸风格 */
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 4px;
    cursor: pointer;
    font-family: "Microsoft Yahei", sans-serif; /* 按钮用清晰字体，对比手写体 */
    font-size: 16px;
    transition: background-color 0.3s;
    display: block;
    margin: 20px auto;
}
.reveal-btn:hover {
    background-color: #6b5435; /*  hover加深，增强交互感 */
}

/* 信件内容样式 */
.letter-content {
    font-size: 18px;
    line-height: 1.8;
    color: #5a4a3f; /* 深棕色，模拟墨水色 */
    font-style: italic;
    min-height: 150px;
    position: relative;
    z-index: 1; /* 内容层级高于容器背景 */
}
/* 信件行： */
.letter-line {
    font-family: "华文行楷", "STXingkai", "Brush Script MT", cursive; /* 中/英文手写体备选 */
    font-size: 1.2rem; /* 手写体稍大，更显飘逸 */
    margin-bottom: 15px;
    display: block;
    /* 初始隐藏状态（配合hidden类） */
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
/* 信件行显示状态 */
.letter-line.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 落款样式 */
.letter-signature {
    font-family: "华文行楷", "STXingkai", "Brush Script MT", cursive; /* 同信件行手写体 */
    font-size: 1.4rem; /* 落款稍大，突出签名 */
    text-align: right;
    margin-top: 30px;
    font-style: normal;
    /* 初始隐藏状态 */
    opacity: 0;
    transition: opacity 1.5s ease;
}
/* 落款显示状态 */
.letter-signature.visible {
    opacity: 1;
}

/* 光标动画 */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2em;
    background-color: #8c6d46;
    margin-left: 2px;
    animation: blink 1s infinite;
    vertical-align: middle;
}
@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 0; }
    100% { opacity: 1; }
}

/* 上下文段落样式 */
.context {
    color: #666;
    font-style: italic;
    border-left: 3px solid #e8dcbb;
    padding-left: 15px;
    margin: 20px 0;
}

/* 强制隐藏类 */
.hidden {
    opacity: 0 !important; /* !important 确保优先级，不被其他样式覆盖 */
    transform: translateY(10px) !important;
}