/* =====================================================
   Black & White Minimal UI Redesign (v1.2.0)
   Enforces flat, high-contrast light theme with rectilinear geometry.
   ===================================================== */

:root {
    /* Background */
    --bg-primary: #FFFFFF;
    --bg-secondary: #FAFAFA;
    --bg-tertiary: #F5F5F5;

    /* Text */
    --text-primary: #000000;
    --text-secondary: #555555;
    --text-tertiary: #8C8C8C;

    /* Borders */
    --border-primary: #E0E0E0;
    --border-secondary: #F0F0F0;
    --border-strong: #000000;

    /* Accent */
    --accent-primary: #000000;
    --accent-hover: #333333;
    --accent-muted: #888888;


    /* Typography */
    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-lg: 18px;
    --text-xl: 24px;
    --text-2xl: 32px;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;

    /* Shadow */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* ==========================
   Global Reset & Base Styles
   ========================== */
* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
    background: transparent;
    border-radius: 0;
}

button,
select {
    cursor: pointer;
}

/* ================
   Navigation Bar
   ================ */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.nav-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 14px var(--space-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

.nav-title {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-placeholder {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-placeholder svg {
    width: 100%;
    height: 100%;
    stroke: var(--text-primary);
}

.nav-title h1 {
    margin: 0;
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-btn {
    height: 36px;
    padding: 0 var(--space-4);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--text-sm);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.nav-btn:hover,
.nav-btn:focus-visible {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #FFFFFF;
    outline: none;
}

/* =====================
   Layout & Containers
   ===================== */
.content-wrapper {
    width: 1600px;
    max-width: calc(100vw - 40px);
    padding: var(--space-6) var(--space-4) var(--space-10);
    margin-top: 88px; /* account for fixed nav */
}

.container {
    width: 100%;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: var(--space-4);
}

.main-content {
    display: flex;
    gap: var(--space-4);
    height: calc(100vh - 220px);
    min-height: calc(100vh - 220px);
}

.left-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    min-width: 0;
    height: 100%;
    overflow: hidden;
}

.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100%;
    overflow: hidden;
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    padding: var(--space-5);
    box-shadow: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
    border-color: var(--border-strong);
}

.card h2 {
    margin-top: 0;
    margin-bottom: var(--space-4);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
}

/* =====================
   Upload Section & Options
   ===================== */
.upload-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.upload-section {
    display: flex;
    gap: var(--space-3);
    align-items: center;
}

.upload-section input[type="file"] {
    flex: 1;
    min-width: 180px;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.upload-section input[type="file"]:hover,
.upload-section input[type="file"]:focus-visible {
    border-color: var(--accent-primary);
    outline: none;
}

#upload-btn {
    height: 40px;
    padding: 0 var(--space-5);
    border: 1px solid var(--accent-primary);
    background: var(--accent-primary);
    color: #FFFFFF;
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

#upload-btn:hover,
#upload-btn:focus-visible {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    outline: none;
}

#upload-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.options {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
}

.options label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    position: relative;
}

.options input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.checkmark {
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.2s ease, background 0.2s ease;
}

.options input[type="checkbox"]:checked + .checkmark {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkmark::after {
    content: "";
    width: 8px;
    height: 8px;
    transform: rotate(45deg);
    border: 2px solid transparent;
    border-top: none;
    border-left: none;
    display: block;
}

.options input[type="checkbox"]:checked + .checkmark::after {
    border-color: #FFFFFF;
}

.role-selector,
.role-select {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    flex: 1;
    min-width: 0;
}

.role-selector:focus-visible,
.role-select:focus-visible,
.role-selector:hover,
.role-select:hover {
    border-color: var(--accent-primary);
    outline: none;
}

/* =====================
   Progress Card & Results
   ===================== */
.progress-card {
    display: none;
    padding: var(--space-4);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
}

#progress-bar {
    width: 100%;
    height: 6px;
    appearance: none;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
}

#progress-bar::-webkit-progress-bar {
    background: var(--bg-tertiary);
}

#progress-bar::-webkit-progress-value {
    background: var(--accent-primary);
}

#progress-bar::-moz-progress-bar {
    background: var(--accent-primary);
}

#progress-text {
    margin-top: var(--space-2);
    text-align: center;
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.result-card {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    height: 100%;
    overflow: hidden;
}

.result-card h2 {
    margin-bottom: var(--space-3);
}

.transcription-content {
    flex: 1;
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    padding: var(--space-4);
    overflow-y: auto;
}

.transcription-content .placeholder {
    margin: 0;
    color: var(--text-secondary);
}

/* =====================
   Chat Panel
   ===================== */
.chat-card {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    height: 100%;
    overflow: hidden;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--border-primary);
}

.chat-header h2 {
    margin: 0;
    font-size: var(--text-lg);
    font-weight: 600;
}

.chat-header-btn {
    padding: var(--space-1) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.chat-header-btn:hover,
.chat-header-btn:focus-visible {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    outline: none;
}

.chat-messages {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-5) 0;
    overflow-y: auto;
}

.message {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: 0 var(--space-5);
    animation: fade-in 0.2s ease;
}

.message-avatar {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-message {
    flex-direction: row-reverse;
}

.user-message .message-avatar {
    visibility: hidden;
    width: 0;
    margin: 0;
}

.assistant-message .message-avatar {
    background-image: url('data:image/svg+xml;utf8,<svg width="36" height="36" viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M6 14C6 11.7909 7.79086 10 10 10H30C32.2091 10 34 11.7909 34 14V26C34 28.2091 32.2091 30 30 30H26L22 34L18 30H10C7.79086 30 6 28.2091 6 26V14Z" stroke="black" stroke-width="2"/><path d="M14 18V23" stroke="black" stroke-width="2.5" stroke-linecap="round"/><path d="M20 16V24" stroke="black" stroke-width="2.5" stroke-linecap="round"/><path d="M26 18V23" stroke="black" stroke-width="2.5" stroke-linecap="round"/></svg>');
    background-size: 24px 24px;
    background-position: center;
    background-repeat: no-repeat;
}

.message-content {
    position: relative;
    max-width: min(680px, 78%);
    padding: var(--space-6) var(--space-8);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    white-space: normal;
    word-break: break-word;
    font-size: 15px;
    line-height: 1.8;
    letter-spacing: 0.01em;
}

.assistant-message .message-content {
    background: var(--bg-secondary);
    border-color: var(--border-secondary);
}

.assistant-message .message-content::before {
    content: '';
    position: absolute;
    inset: 4px;
    border: 1px solid transparent;
    pointer-events: none;
    transition: border-color 0.2s ease;
}

.assistant-message:hover .message-content::before {
    border-color: var(--border-primary);
}

.message-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.message-timestamp {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.message-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.message-action-btn {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    border-radius: 50%;
    color: var(--text-secondary);
    background: transparent;
    opacity: 0.55;
    transition: opacity 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.message-action-btn svg {
    width: 16px;
    height: 16px;
}

.message-action-btn:hover,
.message-action-btn:focus-visible {
    opacity: 1;
    border-color: var(--border-primary);
    background: var(--bg-primary);
    outline: none;
}

.message-body {
    display: block;
    color: inherit;
    font-size: inherit;
    line-height: inherit;
}

.message-body.loading {
    color: var(--text-tertiary);
}

.message-loading {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.message-loading-main {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 500;
}

.loading-spinner {
    position: relative;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(0, 0, 0, 0.12);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.message-loading-actions {
    display: flex;
    gap: var(--space-2);
}

.stop-generation-btn {
    align-self: flex-start;
    padding: 6px 12px;
    border: 1px solid var(--border-primary);
    background: rgba(0, 0, 0, 0.04);
    font-size: var(--text-sm);
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.stop-generation-btn:hover,
.stop-generation-btn:focus-visible {
    background: rgba(0, 0, 0, 0.12);
    border-color: var(--accent-primary);
    outline: none;
}

.stop-generation-btn.is-disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.message-abort-notice {
    margin-top: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border: 1px dashed var(--border-primary);
    background: var(--bg-tertiary);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.message-failure {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3);
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: rgba(0, 0, 0, 0.03);
}

.message-failure-icon {
    font-size: 20px;
    line-height: 1;
}

.message-failure-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.message-failure-title {
    font-weight: 600;
}

.message-failure-reason,
.message-failure-detail {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.message-failure-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-3);
}

.message-failure-actions button {
    padding: 6px 14px;
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.message-failure-actions button:hover,
.message-failure-actions button:focus-visible {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
    outline: none;
}

.user-message .message-content {
    border-color: var(--border-strong);
}

.message-content p,
.preview-message-body p,
.export-snapshot-root .preview-message-body p {
    margin: 0 0 var(--space-5) 0;
}

.message-content p:last-child,
.preview-message-body p:last-child,
.export-snapshot-root .preview-message-body p:last-child {
    margin-bottom: 0;
}

.user-message-body {
    white-space: pre-wrap;
}

.user-message-body.user-body-collapsed {
    display: -webkit-box;
    -webkit-line-clamp: 5;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.user-message-footer {
    margin-top: var(--space-2);
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--text-secondary);
}

.user-message-status {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.user-message-status[data-state="failed"] {
    color: #d93025;
}

.user-message-status[data-state="sending"] {
    color: var(--text-secondary);
}

.user-message-status[data-state="cancelled"],
.user-message-status[data-state="aborted"] {
    color: var(--text-secondary);
}

.user-message-toggle {
    display: none;
    padding: 4px 8px;
    border: 1px solid var(--border-primary);
    background: rgba(0, 0, 0, 0.02);
    font-size: var(--text-xs);
    color: var(--text-secondary);
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.user-message-toggle:hover,
.user-message-toggle:focus-visible {
    background: rgba(0, 0, 0, 0.08);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    outline: none;
}

/* ==================== 列表样式 - 飞书风格（完全左对齐） ==================== */

/* 所有列表：去除默认缩进，左对齐 */
.message-content ul,
.message-content ol,
.preview-message-body ul,
.preview-message-body ol {
    margin: var(--space-3) 0 var(--space-4) 0;
    padding-left: 0;
    line-height: 1.9;
    list-style: none;
    text-align: left;
}

/* 所有列表项：极简风格，完全无缩进 */
.message-content li,
.preview-message-body li {
    position: relative;
    padding-left: 0 !important;  /* 移除所有缩进 */
    margin-bottom: var(--space-2);
    margin-left: 0;
    text-align: left;
}

.message-content li:last-child,
.preview-message-body li:last-child {
    margin-bottom: 0;
}

/* ⭐ 核心修复：嵌套列表使用负边距拉回左边缘（抵消父li的padding）*/
.message-content ul ul,
.message-content ol ol,
.message-content ul ol,
.message-content ol ul,
.preview-message-body ul ul,
.preview-message-body ol ol,
.preview-message-body ul ol,
.preview-message-body ol ul {
    padding-left: 0 !important;
    margin-top: var(--space-2);
    margin-left: 0 !important;  /* 统一极简风格：无缩进 */
}

/* 所有嵌套列表项：极简风格，完全无缩进 */
.message-content ul ul > li,
.message-content ol ol > li,
.message-content ul ol > li,
.message-content ol ul > li,
.preview-message-body ul ul > li,
.preview-message-body ol ol > li,
.preview-message-body ul ol > li,
.preview-message-body ol ul > li {
    margin-left: 0 !important;
    padding-left: 0 !important;  /* 移除所有缩进 */
}

/* 有序列表使用数字 */
.message-content ol,
.preview-message-body ol {
    counter-reset: list-counter;
}

.message-content ol > li,
.preview-message-body ol > li {
    counter-increment: list-counter;
}

/* 有序列表：一级列表样式 - 简洁风格（无符号）*/
.message-content ol > li::before,
.preview-message-body ol > li::before {
    content: '';  /* 不显示任何符号 */
}

/* 有序列表：二级列表样式 - 简洁风格（无符号）*/
.message-content ol ol > li::before,
.preview-message-body ol ol > li::before {
    content: '' !important;  /* 不显示任何符号 */
}

/* 无序列表：一级列表样式 - 简洁风格（无符号）*/
.message-content ul > li::before,
.preview-message-body ul > li::before {
    content: '';  /* 不显示任何符号 */
}

/* 无序列表：二级列表样式 - 简洁风格（无符号）*/
.message-content ul ul > li::before,
.preview-message-body ul ul > li::before {
    content: '' !important;  /* 不显示任何符号 */
}

/* ==================== 导出场景：使用相同的列表样式（完全左对齐） ==================== */
.export-snapshot-root .preview-message-body ul,
.export-snapshot-root .preview-message-body ol {
    list-style: none !important;
    padding-left: 0;
    margin-left: 0;
}

.export-snapshot-root .preview-message-body li {
    position: relative;
    padding-left: 0 !important;
    margin-left: 0 !important;
    list-style: none !important;
}

/* 导出：嵌套列表使用负边距拉回左边缘（与主场景相同修复）*/
.export-snapshot-root .preview-message-body ul ul,
.export-snapshot-root .preview-message-body ol ol,
.export-snapshot-root .preview-message-body ul ol,
.export-snapshot-root .preview-message-body ol ul {
    padding-left: 0 !important;
    margin-top: var(--space-2);
    margin-left: 0 !important;  /* 统一极简风格：无缩进 */
}

/* 导出：所有嵌套列表项强制左对齐 */
.export-snapshot-root .preview-message-body ul ul > li,
.export-snapshot-root .preview-message-body ol ol > li,
.export-snapshot-root .preview-message-body ul ol > li,
.export-snapshot-root .preview-message-body ol ul > li {
    margin-left: 0 !important;
    padding-left: 0 !important;
    text-indent: 0 !important;
}

/* 导出：移除所有无序列表符号（一级） */
.export-snapshot-root .preview-message-body ul > li::before {
    content: none !important;
}

/* 导出：移除所有无序列表符号（二级及更深） */
.export-snapshot-root .preview-message-body ul ul > li::before {
    content: none !important;
}

/* 导出：有序列表 */
.export-snapshot-root .preview-message-body ol {
    counter-reset: list-counter;
}

.export-snapshot-root .preview-message-body ol > li {
    counter-increment: list-counter;
}

/* 导出：移除所有有序列表编号 */
.export-snapshot-root .preview-message-body ol > li::before {
    content: none !important;
}

/* 导出：恢复有序列表编号（保留序号、零缩进、顶格） */
.export-snapshot-root .preview-message-body ol {
    counter-reset: list-counter; /* 已有定义，重复声明确保稳定 */
}
.export-snapshot-root .preview-message-body ol > li {
    counter-increment: list-counter; /* 已有定义，重复声明确保稳定 */
    padding-left: 0 !important;
    margin-left: 0 !important;
}
.export-snapshot-root .preview-message-body ol > li::before {
    content: counter(list-counter) "." !important;
    position: static !important;   /* 不绝对定位，避免与文本重叠 */
    margin-right: 0.35em;          /* 数字与文本留出间距 */
    color: #000000;
    font-weight: 600;
    font-size: calc(1em + 2px);
}

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.preview-message-body h1,
.preview-message-body h2,
.preview-message-body h3,
.preview-message-body h4,
.export-snapshot-root .preview-message-body h1,
.export-snapshot-root .preview-message-body h2,
.export-snapshot-root .preview-message-body h3,
.export-snapshot-root .preview-message-body h4 {
    margin: var(--space-6) 0 var(--space-4);
    font-weight: 600;
    line-height: 1.4;
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child,
.message-content h4:first-child,
.preview-message-body h1:first-child,
.preview-message-body h2:first-child,
.preview-message-body h3:first-child,
.preview-message-body h4:first-child,
.export-snapshot-root .preview-message-body h1:first-child,
.export-snapshot-root .preview-message-body h2:first-child,
.export-snapshot-root .preview-message-body h3:first-child,
.export-snapshot-root .preview-message-body h4:first-child {
    margin-top: 0;
}

.message-content pre,
.preview-message-body pre,
.export-snapshot-root .preview-message-body pre {
    margin: var(--space-3) 0;
    padding: var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-tertiary);
    overflow-x: auto;
}

.message-content code,
.preview-message-body code,
.export-snapshot-root .preview-message-body code {
    font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    background: var(--bg-tertiary);
    padding: 2px 4px;
}

.message-content pre code,
.preview-message-body pre code,
.export-snapshot-root .preview-message-body pre code {
    background: transparent;
    padding: 0;
}

/* Loading placeholder */
.message-content.loading {
    position: relative;
    min-width: 48px;
}

.message-content.loading::after {
    content: "";
    position: absolute;
    right: -16px;
    bottom: 8px;
    width: 14px;
    height: 14px;
    border: 2px solid var(--accent-muted);
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.chat-input-area {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-4) var(--space-5);
    border-top: 1px solid var(--border-primary);
}

.speaker-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.speaker-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
}

.speaker-tag-close {
    border: none;
    background: none;
    color: var(--accent-muted);
    font-size: 18px;
    line-height: 1;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.speaker-tag-close:hover,
.speaker-tag-close:focus-visible {
    color: var(--accent-primary);
    outline: none;
}

.selectors-container {
    display: flex;
    gap: var(--space-3);
    align-items: center;
    flex-wrap: nowrap;
    width: 100%;
}

.chat-input-wrapper {
    display: flex;
    gap: var(--space-3);
    align-items: flex-end;
}

#chat-input {
    flex: 1;
    min-height: 40px;
    max-height: 140px;
    padding: var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    resize: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#chat-input:focus-visible {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.08);
    outline: none;
}

.send-button {
    height: 40px;
    padding: 0 var(--space-5);
    border: 1px solid var(--accent-primary);
    background: var(--accent-primary);
    color: #FFFFFF;
    font-weight: 600;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.send-button:hover,
.send-button:focus-visible {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    outline: none;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Model dropdown */
.model-select {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    flex: 1;
    min-width: 0;
    cursor: pointer;
}

.model-select:focus-visible,
.model-select:hover {
    border-color: var(--accent-primary);
    outline: none;
}

/* Speakers dropdown wrapper */
.speaker-select-wrapper {
    flex: 1;
    min-width: 0;
    position: relative;
}

/* Speakers dropdown */
.speaker-select {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
}

.send-selected-btn {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
    transition: background 0.2s ease, border-color 0.2s ease;
}

.send-selected-btn:hover,
.send-selected-btn:focus-visible {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    outline: none;
}

/* =====================
   Timestamps & Audio Player
   ===================== */
.timestamp {
    color: var(--accent-primary);
    cursor: pointer;
    font-weight: 500;
}

.timestamp:hover,
.timestamp:focus-visible {
    text-decoration: underline;
    outline: none;
}

.audio-player {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    display: flex;
    justify-content: center;
    z-index: 900;
}

.audio-player audio {
    width: min(800px, calc(100vw - 80px));
}

/* =====================
   Toast Notifications
   ===================== */
#toast-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: 1100;
    pointer-events: none;
}

.toast-message {
    min-width: 180px;
    padding: var(--space-3) var(--space-4);
    background: rgba(0, 0, 0, 0.5);
    color: #FFFFFF;
    border: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: auto;
}

.toast-message.show {
    opacity: 1;
}

.toast-message.success,
.toast-message.error,
.toast-message.info,
.toast-message.warning {
    background: rgba(0, 0, 0, 0.5);
    color: #FFFFFF;
}

/* =====================
   Message Context Menu
   ===================== */
.message-context-menu {
    position: fixed;
    background: #FFFFFF;
    border: 1px solid #E5E5E5;
    border-radius: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 8px 0;
    min-width: 180px;
    z-index: 1300;
    display: none;
}

.message-context-menu.visible {
    display: block;
}

.message-context-menu button {
    width: 100%;
    padding: 12px 20px;
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #000000;
    font-size: 14px;
    text-align: left;
}

.message-context-menu button:hover,
.message-context-menu button:focus-visible {
    background: #F5F5F5;
    outline: none;
}

.message-context-menu svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* =====================
   Message Preview Modal
   ===================== */
.message-preview-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1400;
    padding: 50px min(6vw, 48px);
}

.message-preview-overlay.visible {
    display: flex;
}

.message-preview-modal {
    width: min(64vw, 840px);
    max-width: 840px;
    height: min(calc(100vh - 100px), 880px);
    max-height: calc(100vh - 100px);
    background: #FFFFFF;
    border: 1px solid #E5E5E5;
    border-radius: 0;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

@media (max-width: 768px) {
    .message-preview-overlay {
        padding: 32px 16px;
    }

    .message-preview-modal {
        width: 92vw;
        max-width: 92vw;
        height: auto;
        max-height: calc(100vh - 64px);
    }
}

.message-preview-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    padding: var(--space-5) var(--space-6) var(--space-4);
    gap: var(--space-4);
    border-bottom: 1px solid #E5E5E5;
}

.message-preview-title {
    font-size: 16px;
    font-weight: 600;
    color: #000000;
}

.message-preview-toolbar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.export-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px solid #D9D9D9;
    background: #FFFFFF;
    color: #000000;
    font-size: 14px;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.export-button svg {
    width: 16px;
    height: 16px;
}

.export-button:hover,
.export-button:focus-visible {
    background: #F5F5F5;
    border-color: #000000;
    outline: none;
}

.export-button[disabled] {
    opacity: 0.5;
    pointer-events: none;
}

.message-preview-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid transparent;
    background: transparent;
    color: #000000;
    font-size: 18px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.message-preview-close:hover,
.message-preview-close:focus-visible {
    background: #F5F5F5;
    border-color: #000000;
    outline: none;
}

.message-preview-content {
    flex: 1;
    overflow: auto;
    padding: 40px;
    background: #FFFFFF;
}

.preview-message-body {
    font-size: 16px;
    line-height: 1.8;
    color: #000000;
    overflow-x: auto;
}

.preview-message-body table {
    width: max(100%, 600px);
}

.preview-message-body details {
    margin-bottom: var(--space-4);
}

.export-snapshot-root {
    position: fixed;
    top: -10000px;
    left: -10000px;
    width: clamp(640px, 64vw, 840px);
    padding: 40px;
    background: #FFFFFF;
    z-index: -1;
    box-shadow: none;
}

@media (max-width: 768px) {
    .export-snapshot-root {
        width: calc(100vw - 32px);
    }
}

.export-snapshot-root .preview-message-body {
    width: 100%;
}

.export-snapshot-root,
.export-snapshot-root * {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #000000;
}

.export-snapshot-root details {
    border: 1px solid #E0E0E0;
    background: #FAFAFA;
    padding: 16px 20px;
}

.message-preview-content::-webkit-scrollbar,
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.message-preview-content::-webkit-scrollbar-thumb,
.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
}

.message-preview-content::-webkit-scrollbar-track,
.chat-messages::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
}

/* =====================
   Modal (API Key & Speaker Selection)
   ===================== */
.speaker-modal,
.api-key-dialog {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1200;
}

.speaker-modal-content,
.api-key-content {
    width: min(90%, 480px);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    padding: var(--space-5);
}

.speaker-modal-content h3,
.api-key-content h2 {
    margin: 0 0 var(--space-4) 0;
    font-size: var(--text-lg);
    font-weight: 600;
}

.speaker-list {
    max-height: 320px;
    overflow-y: auto;
    margin-bottom: var(--space-4);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
}

.speaker-item {
    padding: var(--space-3);
    border-bottom: 1px solid var(--border-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

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

.speaker-item label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
}

.speaker-modal-buttons,
.api-key-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

.speaker-modal-buttons button,
.api-key-actions button {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
}

.speaker-modal-buttons .send-selected,
.api-key-actions .confirm {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #FFFFFF;
}

.speaker-modal-buttons .send-selected:hover,
.api-key-actions .confirm:hover,
.speaker-modal-buttons .send-selected:focus-visible,
.api-key-actions .confirm:focus-visible {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    outline: none;
}

.speaker-modal-buttons .cancel,
.api-key-actions .cancel {
    background: var(--bg-primary);
}

/* =====================
   Tables inside chat markdown
   ===================== */
.message-content table,
.preview-message-body table,
.export-snapshot-root .preview-message-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-3) 0;
    background: var(--bg-primary);
    overflow: hidden;
}

.message-content th,
.message-content td,
.preview-message-body th,
.preview-message-body td,
.export-snapshot-root .preview-message-body th,
.export-snapshot-root .preview-message-body td {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    text-align: left;
    font-size: var(--text-sm);
}

.message-content th,
.preview-message-body th,
.export-snapshot-root .preview-message-body th {
    background: var(--bg-secondary);
    font-weight: 600;
}

/* 引用块 */
.message-content blockquote,
.preview-message-body blockquote,
.export-snapshot-root .preview-message-body blockquote {
    margin: var(--space-4) 0;
    padding: var(--space-3) var(--space-4);
    border-left: 3px solid var(--border-primary);
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.message-content blockquote p:last-child,
.preview-message-body blockquote p:last-child,
.export-snapshot-root .preview-message-body blockquote p:last-child {
    margin-bottom: 0;
}

/* 粗体 */
.message-content strong,
.message-content b,
.preview-message-body strong,
.preview-message-body b,
.export-snapshot-root .preview-message-body strong,
.export-snapshot-root .preview-message-body b {
    font-weight: 600;
}

/* 斜体 */
.message-content em,
.message-content i,
.preview-message-body em,
.preview-message-body i,
.export-snapshot-root .preview-message-body em,
.export-snapshot-root .preview-message-body i {
    font-style: italic;
}

/* 删除线 */
.message-content del,
.message-content s,
.preview-message-body del,
.preview-message-body s,
.export-snapshot-root .preview-message-body del,
.export-snapshot-root .preview-message-body s {
    text-decoration: line-through;
    opacity: 0.7;
}

/* 链接 */
.message-content a,
.preview-message-body a,
.export-snapshot-root .preview-message-body a {
    color: var(--accent-primary);
    text-decoration: underline;
    text-decoration-color: var(--border-primary);
    transition: text-decoration-color 0.2s ease;
}

.message-content a:hover,
.preview-message-body a:hover {
    text-decoration-color: var(--accent-primary);
}

/* 图片 */
.message-content img,
.preview-message-body img,
.export-snapshot-root .preview-message-body img {
    max-width: 100%;
    height: auto;
    border-radius: 0;
    margin: var(--space-3) 0;
}

.message-content hr,
.preview-message-body hr,
.export-snapshot-root .preview-message-body hr {
    border: none;
    height: 1px;
    margin: var(--space-5) 0;
    background: var(--border-primary);
}

/* =====================
   Animations
   ===================== */
@keyframes fade-in {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* =====================
   Scrollbar (minimal)
   ===================== */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-primary) transparent;
}

*::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

*::-webkit-scrollbar-track {
    background: transparent;
}

*::-webkit-scrollbar-thumb {
    background: var(--border-primary);
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--accent-muted);
}

/* =====================
   Responsive Adjustments
   ===================== */
@media (max-width: 1440px) {
    .content-wrapper {
        width: 1280px;
    }

    .nav-content {
        padding: 12px var(--space-4);
    }
}

@media (max-width: 1200px) {
    .content-wrapper {
        width: 100%;
    }

    .main-content {
        flex-direction: column;
        height: auto;
        min-height: 0;
    }

    .chat-card {
        min-height: 480px;
    }
}

@media (max-width: 900px) {
    .nav-content {
        padding: 10px var(--space-3);
    }

    .nav-title h1 {
        font-size: 18px;
    }

    .content-wrapper {
        margin-top: 80px;
    }
}

@media (max-width: 768px) {
    .content-wrapper {
        padding: var(--space-4);
        margin-top: 72px;
    }

    .nav-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }

    .nav-links {
        width: 100%;
    }

    .main-content {
        gap: var(--space-3);
        height: auto;
        min-height: 0;
    }

    .card {
        padding: var(--space-4);
    }

    .message {
        padding: 0 var(--space-3);
    }

    .chat-input-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .send-button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .nav-title h1 {
        font-size: 16px;
    }

    .nav-btn {
        width: 100%;
        justify-content: center;
    }

    .card {
        padding: var(--space-3);
    }

    .message-content {
        max-width: 100%;
    }

    .audio-player {
        padding: var(--space-2) var(--space-3);
    }

    .audio-player audio {
        width: calc(100vw - 48px);
    }
}

/* =====================
   Reasoning Details Toggle
   ===================== */
.reasoning-content {
    border: 1px solid var(--border-secondary);
    background: var(--bg-secondary);
    padding: var(--space-3) var(--space-4);
    margin: var(--space-3) 0;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
}

.reasoning-content summary {
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.reasoning-content summary::-webkit-details-marker {
    display: none;
}

.reasoning-content summary::before {
    content: "▶";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-weight: 500;
}

.reasoning-content[open] summary::before,
.reasoning-content[data-collapsed="false"] summary::before {
    content: "▼";
}

.reasoning-content p {
    margin: var(--space-2) 0;
    color: var(--text-secondary);
}


.reasoning-content summary:hover {
    color: var(--text-primary);
}
.reasoning-content[open] summary {
    color: var(--text-primary);
}

/* =====================
   Role Management Dialogs
   ===================== */
.role-edit-dialog,
.role-manage-dialog {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1300;
}

.role-edit-dialog .dialog-content,
.role-manage-dialog .dialog-content {
    width: min(92%, 600px);
    max-height: 85vh;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
    padding: 0;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    margin-bottom: var(--space-4);
}

.input-group label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    resize: vertical;
    min-height: 40px;
}

.input-group textarea {
    min-height: 120px;
}

.input-group input:focus-visible,
.input-group textarea:focus-visible {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.08);
    outline: none;
}

.input-hint {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.error-message {
    font-size: var(--text-xs);
    color: var(--accent-primary);
    font-weight: 600;
    min-height: 16px;
}

.button-group,
.dialog-buttons,
.bottom-buttons,
.api-key-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

.save-button,
.cancel-button,
.close-button,
.add-role-btn {
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
    font-weight: 500;
    white-space: nowrap;
    min-width: fit-content;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.save-button,
.add-role-btn {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #FFFFFF;
}

.save-button:hover,
.add-role-btn:hover,
.save-button:focus-visible,
.add-role-btn:focus-visible {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    outline: none;
}

.cancel-button:hover,
.close-button:hover,
.cancel-button:focus-visible,
.close-button:focus-visible {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    outline: none;
}

.dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-secondary);
}

.dialog-header h3 {
    margin: 0;
    font-size: var(--text-lg);
    font-weight: 600;
}

.dialog-close {
    border: none;
    background: transparent;
    font-size: 24px;
    line-height: 1;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0 var(--space-1);
}

.dialog-close:hover,
.dialog-close:focus-visible {
    color: var(--text-primary);
    outline: none;
}

.roles-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    background: var(--bg-primary);
}

.role-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.section-title {
    margin: 0;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    letter-spacing: 0.08em;
}

.role-item {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-secondary);
}

.role-item.is-system {
    background: var(--bg-primary);
    border-style: dashed;
}

.role-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.role-name-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.role-name {
    font-weight: 600;
    font-size: var(--text-base);
}

.role-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

.role-prompt-preview {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    max-height: 6em;
    overflow: hidden;
    white-space: pre-line;
}

.role-badge {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    border: 1px solid var(--border-secondary);
    border-radius: 999px;
    padding: var(--space-1) var(--space-2);
    background: var(--bg-tertiary);
}

.role-empty {
    margin: 0;
    padding: var(--space-3);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    border: 1px dashed var(--border-secondary);
    background: var(--bg-secondary);
}

.role-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.edit-role-btn,
.delete-role-btn {
    padding: var(--space-1) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-xs);
    line-height: 1.4;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.edit-role-btn:hover,
.edit-role-btn:focus-visible {
    border-color: var(--accent-primary);
    outline: none;
}

.delete-role-btn {
    color: var(--accent-primary);
    border-color: var(--border-secondary);
}

.delete-role-btn:hover,
.delete-role-btn:focus-visible {
    background: var(--accent-primary);
    color: #FFFFFF;
    outline: none;
}

.role-edit-dialog .input-group,
.role-edit-dialog .dialog-buttons {
    padding: 0 var(--space-4);
}

.role-edit-dialog .input-group:last-of-type {
    margin-bottom: var(--space-5);
}

.role-edit-dialog .dialog-buttons {
    padding-bottom: var(--space-4);
}

.bottom-buttons {
    justify-content: space-between;
    padding: var(--space-4);
    border-top: 1px solid var(--border-primary);
    background: var(--bg-secondary);
}

/* ==================== 强制覆盖：极简风格列表（完全无缩进、无符号） ==================== */
.message-content li,
.message-content ol > li,
.message-content ul > li,
.message-content ol ol > li,
.message-content ul ul > li,
.preview-message-body li,
.preview-message-body ol > li,
.preview-message-body ul > li,
.preview-message-body ol ol > li,
.preview-message-body ul ul > li,
.export-snapshot-root .preview-message-body li,
.export-snapshot-root .preview-message-body ol > li,
.export-snapshot-root .preview-message-body ul > li,
.export-snapshot-root .preview-message-body ol ol > li,
.export-snapshot-root .preview-message-body ul ul > li {
    padding-left: 0 !important;
    margin-left: 0 !important;
    text-indent: 0 !important;
}

/* 兜底：彻底禁用 ::marker，避免导出/打印 UA 默认符号残留 */
.message-content li::marker,
.preview-message-body li::marker,
.export-snapshot-root .preview-message-body li::marker {
    content: '' !important;
    color: transparent !important;
}

/* ===================================================================
   统一的极简列表样式（无符号、无缩进）
   - 覆盖所有三个场景：
     1. .message-content (AI 聊天气泡)
     2. .preview-message-body (放大阅读窗口)
     3. .export-snapshot-root (PNG 导出)
   - 此规则块位于文件末尾，具有最高优先级
   =================================================================== */

/* 所有列表容器：移除默认样式和缩进 */
.message-content ul,
.message-content ol,
.preview-message-body ul,
.preview-message-body ol,
.export-snapshot-root .preview-message-body ul,
.export-snapshot-root .preview-message-body ol {
    list-style: none !important;
    margin: var(--space-3) 0 var(--space-4) 0 !important;
    padding: 0 !important;
}

/* 所有列表项：完全左对齐，无缩进 */
.message-content li,
.preview-message-body li,
.export-snapshot-root .preview-message-body li {
    list-style: none !important;
    padding-left: 0 !important;
    margin-left: 0 !important;
    position: relative;
    margin-bottom: var(--space-2);
}

/* 所有列表项的伪元素：移除符号 */
.message-content li::before,
.preview-message-body li::before,
.export-snapshot-root .preview-message-body li::before {
    content: '' !important;        /* 清空内容 */
    display: none !important;      /* 完全隐藏（双重保险） */
}

/* 所有嵌套列表：无缩进 */
.message-content ul ul,
.message-content ol ol,
.message-content ul ol,
.message-content ol ul,
.preview-message-body ul ul,
.preview-message-body ol ol,
.preview-message-body ul ol,
.preview-message-body ol ul,
.export-snapshot-root .preview-message-body ul ul,
.export-snapshot-root .preview-message-body ol ol,
.export-snapshot-root .preview-message-body ul ol,
.export-snapshot-root .preview-message-body ol ul {
    margin-left: 0 !important;
    padding-left: 0 !important;
    margin-top: var(--space-2);
}

/* =====================================================
   Speaker Rename Feature Styles
   ===================================================== */

/* Result Header - 转录结果标题区域 */
.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.result-header h2 {
    margin: 0;
}

/* Edit Speakers Button - 编辑发言人按钮 */
.result-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.result-action-btn {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all 0.2s;
}

.result-action-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.result-action-btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Modal - 弹窗基础样式 */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    width: min(90%, 500px);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-5);
    border-bottom: 1px solid var(--border-primary);
}

.modal-header h3 {
    margin: 0;
    font-size: var(--text-lg);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-5);
    flex: 1;
    overflow-y: auto;
}

.modal-footer {
    padding: var(--space-5);
    border-top: 1px solid var(--border-primary);
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
}

/* Speaker Rename List - 发言人重命名列表 */
.speaker-rename-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.speaker-rename-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--space-4);
    align-items: center;
}

.speaker-rename-item label {
    font-size: var(--text-sm);
    color: var(--text-primary);
    font-weight: 500;
}

.speaker-rename-item input {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-primary);
    background: var(--bg-primary);
    font-size: var(--text-sm);
    color: var(--text-primary);
    outline: none;
}

.speaker-rename-item input:focus {
    border-color: var(--accent-primary);
}

/* Modal Buttons - 弹窗按钮 */
.btn-primary,
.btn-secondary {
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-sm);
    cursor: pointer;
    border: 1px solid var(--border-primary);
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}