/* style.css - Academic Minimalist Theme (Final Version) */

/* --- 1. 基础变量与重置 (Variables & Reset) --- */
:root {
    /* 配色方案 */
    --bg-body: #f8f9fa;          /* 页面背景 */
    --bg-card: #ffffff;          /* 卡片背景 */
    --text-primary: #1a202c;     /* 主标题色 */
    --text-secondary: #718096;   /* 次要文字色 */
    --accent-color: #3182ce;     /* 强调色 (蓝) */
    --border-color: #e2e8f0;     /* 边框色 */
    
    /* 阴影与圆角 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --radius-lg: 12px;
    --radius-md: 8px;

    /* 对话气泡颜色 */
    --user-bubble: #edf2f7;      /* 用户气泡 (浅灰) */
    --ai-bubble: #3182ce;        /* Assistant 气泡 (蓝) */
    --text-ai: #ffffff;          /* Assistant 文字 (白) */
    --highlight: #dd6b20;        /* 播放高亮色 (橙) */
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 60px 20px;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* --- 2. 页面头部 (Paper Header) --- */
.paper-header {
    text-align: center;
    margin-bottom: 50px;
}

.paper-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* Paper Link */
.paper-link {
    display: flex;
    justify-content: center;
    gap: 24px;
    font-weight: 600;
}

.paper-link a {
    color: var(--accent-color);
    text-decoration: none;
}

.paper-link a:hover { text-decoration: underline; }

/* Authors & Affiliations */
.authors {
    font-size: 1.1rem;
    color: #2d3748;
    margin-bottom: 6px;
}

.author { margin: 0 6px; }

.affiliations {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.affiliation { margin: 0 8px; }

/* --- 3. 通用信息卡片 (Abstract, Contents, Arch) --- */
.info-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 40px;
    overflow: hidden;
}

.card-header {
    background-color: #f7fafc;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 700;
    color: #2d3748;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body {
    padding: 24px 30px;
    background: #fff;
}

#abstract .card-body p {
    font-size: 1rem;
    line-height: 1.85;
}

.card-body p {
    margin: 0;
    text-align: left;
    color: #4a5568;
    line-height: 1.7;
}

/* 目录列表 */
.toc-list {
    list-style-type: disc;
    padding-left: 20px;
    margin: 0;
}
.toc-list li { margin-bottom: 8px; color: var(--text-secondary); }
.toc-list a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dashed transparent;
    transition: border 0.2s;
}
.toc-list a:hover { border-bottom-color: var(--accent-color); }

/* 架构图 */
.arch-img {
    max-width: 100%;
    height: auto;
    border: 1px solid #edf2f7;
    border-radius: 4px;
    display: block;
    margin: 0 auto 12px auto;
}
.caption {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: 8px;
}

/* --- 4. 单句展示 (List View) --- */
.section-title-area {
    text-align: center;
    margin-bottom: 30px;
}
.subtitle { color: var(--text-secondary); font-size: 1.1rem; }

/* 复用 .info-card 作为容器，这里定义内部列表样式 */
.group-header {
    /* 特殊化 Header，包含播放器 */
    background-color: #f7fafc;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.ref-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #4a5568;
    font-weight: 700;
    margin: 0;
    display: flex;
    align-items: center;
}
.ref-label::before {
    content: ""; display: inline-block; width: 8px; height: 8px;
    background-color: var(--accent-color); border-radius: 50%; margin-right: 8px;
}

.sample-list {
    display: flex;
    flex-direction: column;
}

.sample-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid #edf2f7;
    gap: 24px;
    transition: background-color 0.2s;
}
.sample-row:last-child { border-bottom: none; }
.sample-row:hover { background-color: #fcfcfc; }

.sample-text {
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-primary);
    font-style: italic;
    line-height: 1.5;
    min-width: 0;
}

.sample-row audio {
    width: 260px;
    height: 32px;
    flex-shrink: 0;
}

/* --- 5. 对话展示 (Dialogue Chat UI) --- */
.dialogue-card { display: flex; flex-direction: column; }
.dialogue-card audio { display: block; width: 100%; }

/* 对话头部：左侧Ref+右侧按钮 */
.dialogue-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    flex-wrap: wrap;
    gap: 15px;
}
.header-left { display: flex; align-items: center; gap: 15px; }

.ref-audio { height: 32px; width: 200px; }

.btn-play-all {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}
.btn-play-all:hover { background-color: #2b6cb0; }

.chat-box {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* .message-row {
    display: flex;
    align-items: flex-start;
    max-width: 85%;
    gap: 12px;
} */

.message-row {
    display: flex;
    flex-direction: row; /* 强制所有角色都是从左到右 */
    align-items: center; /* 垂直居中 */
    justify-content: space-between; /* 两端对齐：左边内容 vs 右边音频 */
    width: 100%;
    padding: 20px 24px;
    border-bottom: 1px solid #edf2f7;
    gap: 20px;
    transition: background-color 0.2s;
}

.message-left {
    display: flex !important;       /* 强制 Flex */
    flex-direction: row !important; /* 强制横向排列 (解决纵向堆叠的关键) */
    align-items: center;            /* 垂直居中 */
    gap: 16px;                      /* 图标和文字的间距 */
    flex: 1;                        /* 占据中间剩余空间 */
    min-width: 0;
    margin-right: 20px;
}

/* User 右侧 */
.message-row.user { align-self: auto; }
/* Assistant 左侧 */
.message-row.assistant { align-self: flex-start; }

/* 头像 */
.avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.user .avatar { background-color: #cbd5e0; color: #4a5568; }
.assistant .avatar { background-color: var(--accent-color); }

/* 气泡 */
.bubble-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 100%;
}

.bubble-text {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
    transition: all 0.2s;
}

.user .bubble-text {
    background-color: var(--user-bubble);
    color: #2d3748;
    border-bottom-right-radius: 6px; /* 1. 恢复右下角为圆角 (与基础圆角大小一致) */
    border-bottom-left-radius: 2px;  /* 2. 新增：将尖角设在左下角 (与 Assistant 一致) */
}

.assistant .bubble-text {
    background-color: var(--ai-bubble);
    color: var(--text-ai);
    border-bottom-left-radius: 2px;
    box-shadow: 0 2px 5px rgba(49, 130, 206, 0.2);
}

/* 播放高亮 */
.playing-highlight {
    box-shadow: 0 0 0 3px rgba(221, 107, 32, 0.4);
    transform: scale(1.01);
    z-index: 2;
}

/* 聊天内播放器 */
.chat-audio {
    height: 30px;
    width: 100%;
    max-width: 240px;
    border-radius: 15px;
}

/* Error & Loading */
.error { color: #c53030; text-align: center; padding: 20px; background: #fff5f5; border-radius: 8px; }
#loading, #loading-dialogue { text-align: center; color: var(--text-secondary); padding: 30px; font-style: italic; }

/* 移动端适配 */
@media (max-width: 768px) {
    .container { padding: 0 10px; }
    .header-left { flex-direction: column; align-items: flex-start; gap: 5px; width: 100%; }
    .ref-audio { width: 100%; }
    .btn-play-all { width: 100%; justify-content: center; margin-top: 10px; }
    
    .sample-row { flex-direction: column; align-items: flex-start; gap: 12px; }
    .sample-row audio { width: 100%; }
    .message-row { max-width: 95%; }
}