/**
 * Waywave 渡澜 - Chat 页面样式
 */

.chat-page {
    display: flex;
    height: 100vh;
    min-height: 100vh;
    overflow: hidden;
    background-color: var(--color-bg);
    margin-top: 0;
}

/* 左侧导航栏适配 */
.chat-page.app-layout {
    margin-left: calc(var(--sidebar-width, 72px) - var(--sidebar-content-overlap, 20px));
    width: calc(100% - (var(--sidebar-width, 72px) - var(--sidebar-content-overlap, 20px)));
}

/* ========================================
   对话历史悬浮弹出框 (Perplexity 风格)
   ======================================== */
.chat-history-popup {
    position: fixed;
    left: var(--sidebar-width, 72px);
    top: 0;
    width: 320px;
    height: 100vh;
    background: var(--color-bg-elevated);
    border-right: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    display: flex;
    flex-direction: column;
    opacity: 0;
    transform: translateX(-8px);
    pointer-events: none;
    transition: opacity 150ms ease-out, transform 150ms ease-out;
}

.chat-history-popup.visible {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.chat-history-popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chat-history-popup-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 var(--spacing-sm);
}

.chat-history-popup-empty {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    padding: var(--spacing-xl) var(--spacing-md);
}

/* 对话历史条目 */
.chat-history-popup-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    position: relative;
}

.chat-history-popup-item:hover {
    background: var(--color-bg-hover);
}

.chat-history-popup-item.active {
    background: rgba(163, 230, 53, 0.08);
}

.chat-history-popup-item-content {
    flex: 1;
    min-width: 0;
}

.chat-history-popup-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

.chat-history-popup-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* 更多操作按钮 */
.chat-history-popup-more {
    width: 28px;
    height: 28px;
    min-width: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    font-size: 16px;
}

.chat-history-popup-item:hover .chat-history-popup-more {
    opacity: 1;
}

.chat-history-popup-more:hover {
    background: var(--color-bg);
    color: var(--color-text-primary);
}

/* 右键/更多菜单 */
.chat-history-context-menu {
    position: fixed;
    min-width: 160px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 300;
    padding: var(--spacing-xs) 0;
}

.chat-history-context-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 8px var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    transition: all var(--transition-fast);
}

.chat-history-context-menu-item:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.chat-history-context-menu-item .iconify {
    font-size: 16px;
}

.chat-history-context-menu-item.danger:hover {
    color: var(--color-error);
}

/* 重命名输入框 */
.chat-history-popup-rename-input {
    width: 100%;
    padding: 4px 8px;
    border: 1px solid var(--brand-primary);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    outline: none;
}

/* 深色模式 */
.theme-dark .chat-history-popup {
    background: var(--dark-bg-elevated);
    border-color: var(--dark-border);
}

/* ========================================
   侧边栏
   ======================================== */
.chat-sidebar {
    width: 280px;
    min-width: 280px;
    background-color: var(--color-bg-elevated);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    transition: width var(--transition-normal), min-width var(--transition-normal), padding var(--transition-normal), opacity var(--transition-fast);
    z-index: 100;
    overflow: hidden;
}

/* 桌面端折叠状态 */
.chat-sidebar.collapsed {
    width: 0;
    min-width: 0;
    padding: 0;
    border-right: none;
    opacity: 0;
    pointer-events: none;
}

.chat-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-xs);
}

.chat-sidebar-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.chat-sidebar-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    border: none;
    background: none;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-sidebar-close-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* 展开对话记录按钮（侧边栏收起后显示） */
.chat-expand-btn {
    position: absolute;
    top: 8px;
    left: 8px;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 10;
}

.chat-expand-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
    border-color: var(--brand-primary);
}

.chat-expand-btn .iconify {
    font-size: 16px;
}

.chat-sidebar-logo {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.chat-logo-zh {
    font-size: var(--font-size-sm);
    color: var(--brand-primary);
}

.chat-sidebar-close {
    display: none; /* 默认桌面端隐藏 */
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: var(--font-size-lg);
}

.chat-back-btn {
    padding: 6px 12px;
    background: var(--color-bg-hover);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

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

.chat-new-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: 10px;
    background: var(--brand-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.chat-new-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    margin-bottom: var(--spacing-md);
}

.chat-empty {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    padding-top: var(--spacing-xl);
}

.chat-history-item {
    padding: 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-bottom: 4px;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    transition: background var(--transition-fast);
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.chat-history-item:hover {
    background: var(--color-bg-hover);
}

.chat-history-item.active {
    background: var(--color-bg-hover);
    font-weight: var(--font-weight-medium);
}

/* 对话标题 - 单行省略 */
.chat-history-title {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
    padding-right: 24px; /* 为操作按钮留出空间 */
}

/* 对话时间 */
.chat-history-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* 操作按钮容器 */
.chat-history-actions {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.chat-history-item:hover .chat-history-actions {
    opacity: 1;
}

/* 操作按钮 - 触控目标 >= 44px (UIUX 4.1) */
.chat-history-action-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.chat-history-action-btn:hover {
    background: var(--color-bg);
    color: var(--color-text-primary);
}

.chat-history-action-btn.delete:hover {
    color: var(--color-error);
}

/* 重命名输入框 */
.chat-history-rename-input {
    width: 100%;
    padding: 4px 8px;
    border: 1px solid var(--brand-primary);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    outline: none;
}

.chat-flow-selector {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.chat-flow-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 8px 10px;
    border-radius: var(--radius-md);
    background: var(--color-bg-hover);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.chat-flow-toggle:hover {
    border-color: var(--brand-primary);
    color: var(--color-text-primary);
    background: var(--color-bg);
}

.chat-flow-toggle-icon {
    margin-left: auto;
    transition: transform var(--transition-fast);
}

.chat-flow-toggle.open .chat-flow-toggle-icon {
    transform: rotate(180deg);
}

.chat-flow-panel {
    margin-top: var(--spacing-sm);
}

.chat-flow-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-normal);
}

.chat-flow-select {
    width: 100%;
    padding: 8px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

/* ========================================
   主内容区
   ======================================== */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* 对话区域 */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* ========================================
   Welcome Mode (Perplexity 风格居中布局)
   ======================================== */
.chat-main.welcome-mode {
    justify-content: center;
    position: relative;
}

/* ========================================
   Welcome 海洋美学背景
   ======================================== */
.chat-ocean-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
    contain: strict;
    will-change: auto;
}

.chat-ocean-gradient {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, #f0f9ff 0%, #e0f2fe 40%, #f0fdf4 100%),
        radial-gradient(ellipse 120% 80% at 50% 120%, rgba(20, 184, 166, 0.12) 0%, transparent 60%),
        radial-gradient(ellipse 100% 60% at 80% 0%, rgba(163, 230, 53, 0.08) 0%, transparent 50%);
}

.theme-dark .chat-ocean-gradient {
    background:
        linear-gradient(180deg, #020617 0%, #0c1426 40%, #041c14 100%),
        radial-gradient(ellipse 120% 80% at 50% 120%, rgba(20, 184, 166, 0.10) 0%, transparent 60%),
        radial-gradient(ellipse 100% 60% at 80% 0%, rgba(163, 230, 53, 0.06) 0%, transparent 50%);
}

/* 光晕 — GPU 加速 */
.chat-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.6;
    animation: chat-glow-drift 20s ease-in-out infinite;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.chat-glow-1 {
    width: 420px;
    height: 420px;
    top: -12%;
    right: -6%;
    background: radial-gradient(circle, rgba(163, 230, 53, 0.20) 0%, transparent 70%);
}

.chat-glow-2 {
    width: 340px;
    height: 340px;
    bottom: 8%;
    left: -6%;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.16) 0%, transparent 70%);
    animation-delay: -7s;
}

.chat-glow-3 {
    width: 260px;
    height: 260px;
    top: 45%;
    left: 50%;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.12) 0%, transparent 70%);
    animation-delay: -14s;
}

.theme-dark .chat-glow-1 { background: radial-gradient(circle, rgba(163, 230, 53, 0.12) 0%, transparent 70%); }
.theme-dark .chat-glow-2 { background: radial-gradient(circle, rgba(20, 184, 166, 0.10) 0%, transparent 70%); }
.theme-dark .chat-glow-3 { background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%); }

@keyframes chat-glow-drift {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(20px, -15px); }
}

/* 波浪 */
.chat-wave-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
    contain: layout style;
}

.chat-wave-layer {
    position: absolute;
    left: -100%;
    width: 300%;
    overflow: visible;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.chat-wave-layer svg {
    position: absolute;
    display: block;
    width: 100%;
    height: 100%;
}

.chat-wave-1 {
    bottom: 0;
    height: 60%;
    animation: chat-wave-right 24s linear infinite;
}
.chat-wave-1 svg path { fill: rgba(163, 230, 53, 0.05); }

.chat-wave-2 {
    bottom: 0;
    height: 45%;
    animation: chat-wave-left 20s linear infinite;
}
.chat-wave-2 svg path { fill: rgba(20, 184, 166, 0.06); }

.chat-wave-3 {
    bottom: 0;
    height: 30%;
    animation: chat-wave-right 28s linear infinite;
}
.chat-wave-3 svg path { fill: rgba(34, 197, 94, 0.04); }

.theme-dark .chat-wave-1 svg path { fill: rgba(163, 230, 53, 0.03); }
.theme-dark .chat-wave-2 svg path { fill: rgba(20, 184, 166, 0.04); }
.theme-dark .chat-wave-3 svg path { fill: rgba(99, 102, 241, 0.03); }

@keyframes chat-wave-right {
    0% { transform: translateX(0); }
    100% { transform: translateX(-33.333%); }
}

@keyframes chat-wave-left {
    0% { transform: translateX(-33.333%); }
    100% { transform: translateX(0); }
}

/* 粒子 */
.chat-particles {
    position: absolute;
    inset: 0;
}

.chat-particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--brand-primary);
    border-radius: 50%;
    opacity: 0.35;
    animation: chat-particle-float 16s ease-in-out infinite;
    will-change: transform, opacity;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.chat-particle:nth-child(1) { left: 12%; top: 22%; }
.chat-particle:nth-child(2) { left: 32%; top: 62%; animation-delay: -4s; animation-duration: 19s; }
.chat-particle:nth-child(3) { left: 55%; top: 28%; animation-delay: -8s; animation-duration: 14s; }
.chat-particle:nth-child(4) { left: 72%; top: 68%; animation-delay: -12s; animation-duration: 21s; }

@keyframes chat-particle-float {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.35; }
    25% { transform: translateY(-25px) translateX(8px); opacity: 0.5; }
    50% { transform: translateY(-40px) translateX(-4px); opacity: 0.25; }
    75% { transform: translateY(-15px) translateX(-10px); opacity: 0.45; }
}

/* Welcome 模式内容层级 */
.chat-main.welcome-mode .chat-messages,
.chat-main.welcome-mode .chat-input-area {
    position: relative;
    z-index: 1;
}

.chat-main.welcome-mode .chat-messages {
    flex: none;
    overflow: visible;
    padding: 0 var(--spacing-lg);
    gap: 0;
}

.chat-main.welcome-mode .chat-input-area {
    border-top: none;
    background: transparent;
    padding: 0 var(--spacing-lg) var(--spacing-xl);
}

.chat-main.welcome-mode .chat-input-container {
    max-width: 680px;
    margin: 0 auto;
}

/* Welcome Hero - 品牌 + 开场白 */
.chat-welcome-hero {
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.chat-welcome-title {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
    margin: 0 0 var(--spacing-sm);
    line-height: var(--line-height-tight);
}

/* 品牌英文 - 与首页 .brand-en 一致 */
.chat-brand-en {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -1px;
}

/* 品牌中文 - 与首页 .brand-zh 一致 */
.chat-brand-zh {
    font-size: 16px;
    font-weight: 500;
    color: var(--brand-primary);
}

.chat-welcome-greeting {
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    margin: 0;
    line-height: var(--line-height-relaxed);
}

/* Welcome Suggestions - 建议药丸 */
.chat-welcome-suggestions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 680px;
    margin: var(--spacing-md) auto 0;
}

.chat-welcome-suggestions:empty {
    display: none;
}

.chat-suggestion-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.chat-suggestion-pill:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    background: rgba(163, 230, 53, 0.06);
}

.chat-suggestion-pill .iconify {
    font-size: 16px;
    flex-shrink: 0;
}

/* ========================================
   Legacy welcome (保留兼容)
   ======================================== */
.chat-welcome {
    text-align: center;
    margin-top: 10vh;
    max-width: 600px;
    align-self: center;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.theme-dark .chat-welcome {
    background: rgba(18, 18, 26, 0.75);
    border-color: rgba(255, 255, 255, 0.1);
}

.chat-welcome-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.chat-welcome h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.chat-welcome p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* 老用户：Onboarding 轻提示 */
.chat-onboarding-hint {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-md) 0 var(--spacing-lg);
    background: rgba(163, 230, 53, 0.08);
    border: 1px solid rgba(163, 230, 53, 0.25);
    border-radius: var(--radius-md);
    text-align: left;
}

.theme-dark .chat-onboarding-hint {
    background: rgba(163, 230, 53, 0.12);
    border-color: rgba(163, 230, 53, 0.2);
}

.chat-onboarding-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: 4px;
}

.chat-onboarding-desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.chat-onboarding-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.chat-suggestions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.chat-expert-hint {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.chat-suggestion {
    padding: 8px 16px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-suggestion:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

/* T-P0-13: 资产入口提示 */
.chat-asset-entries {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px dashed var(--color-border);
}

.chat-asset-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-medium);
}

.chat-asset-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.chat-asset-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    min-width: 80px;
    transition: all var(--transition-fast);
}

.chat-asset-link:hover {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
    text-decoration: none;
}

.chat-asset-link .iconify {
    font-size: 24px;
}

.chat-asset-link span:last-child {
    font-size: var(--font-size-xs);
}

/* 消息气泡 */
.message {
    display: flex;
    gap: var(--spacing-md);
    max-width: 800px;
    width: 100%;
    align-self: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    animation: messageSlideIn 0.3s ease-out;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-user {
    background: var(--color-bg-elevated);
    flex-direction: row-reverse;
    flex-wrap: wrap;
}

.message-ai {
    background: transparent;
    flex-wrap: wrap;
}

.message-user .message-content,
.message-ai .message-content {
    width: 100%;
}

/* 头像已移除，保留类名兼容 */
.message-avatar {
    display: none;
}

.message-content {
    flex: 1;
    line-height: 1.7;
    color: var(--color-text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-user .message-content {
    text-align: right;
}

.message-content p {
    margin-bottom: var(--spacing-sm);
}

.message-content p:last-child {
    margin-bottom: 0;
}

/* AI 消息加载动画 */
.message-loading {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.message-loading::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border);
    border-top-color: var(--brand-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 消息操作按钮（Perplexity 风格图标） */
.message-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    padding-top: var(--spacing-xs);
    width: 100%;
}

.message:hover .message-actions {
    opacity: 1;
}

.message-user .message-actions {
    justify-content: flex-end;
}

.message-action-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.message-action-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* 工具调用提示 */
.message-action-tip {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    background: var(--color-bg-elevated);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    margin-top: var(--spacing-sm);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.message-action-tip.success {
    color: var(--color-success);
    background: rgba(34, 197, 94, 0.1);
}

.message-action-tip.error {
    color: var(--color-error);
    background: rgba(239, 68, 68, 0.1);
}

/* 工具调用内联面板 — 作为 .message-ai 的直接子元素（避免被流式 innerHTML 覆盖） */
.tool-activity {
    width: 100%;
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    font-size: var(--font-size-sm);
    animation: thinkingFadeIn 300ms ease-out;
}

.tool-activity-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 8px 12px;
    background: var(--color-bg-elevated);
    cursor: pointer;
    user-select: none;
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}
.tool-activity-header:hover {
    background: var(--color-bg-hover);
}

.tool-activity-label { flex: 1; }

.tool-activity-toggle {
    transition: transform 200ms;
    font-size: 14px;
}
.tool-activity.collapsed .tool-activity-toggle {
    transform: rotate(-90deg);
}

.tool-activity-steps {
    transition: max-height 300ms ease, opacity 200ms ease;
    max-height: 300px;
    opacity: 1;
    overflow: hidden;
}
.tool-activity.collapsed .tool-activity-steps {
    max-height: 0;
    opacity: 0;
}

.tool-step {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 6px 12px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

.tool-step-icon { font-size: 16px; flex-shrink: 0; }
.tool-step-name { flex: 1; }
.tool-step-status { font-size: var(--font-size-xs); color: var(--color-text-muted); }

.tool-step.success .tool-step-icon { color: var(--color-success); }
.tool-step.error .tool-step-icon { color: var(--color-error); }
.tool-step.error .tool-step-status { color: var(--color-error); }
.tool-step.loading .tool-step-icon { color: var(--brand-primary); }

/* 建议提问 */
.follow-up-suggestions {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    width: 100%;
    display: block;
}

.follow-up-title {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
}

.follow-up-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
}

.follow-up-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    line-height: 1.5;
    width: 100%;
    display: block;
    min-height: 44px; /* 触控目标 >= 44px */
}

.follow-up-btn:hover {
    background: var(--color-bg-hover);
    border-color: var(--brand-primary);
    color: var(--color-text-primary);
    transform: translateX(4px);
}

.follow-up-btn:active {
    transform: translateX(2px);
}

/* 切换专家确认按钮 */
.agent-switch-actions {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.agent-switch-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 40px;
}

.agent-switch-btn.primary {
    background: rgba(34, 197, 94, 0.12);
    border-color: rgba(34, 197, 94, 0.4);
    color: var(--color-text-primary);
}

.agent-switch-btn:hover {
    background: var(--color-bg-hover);
    border-color: var(--brand-primary);
}

/* 输入区域 */
.chat-input-area {
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.chat-input-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat-input-container:focus-within {
    border-color: var(--color-text-muted);
    box-shadow: none;
}

.chat-input-wrapper {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-md) 0;
}

#messageInput {
    width: 100%;
    border: none;
    background: transparent;
    resize: none;
    max-height: 120px;
    padding: 0;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    line-height: var(--line-height-normal);
}

#messageInput:focus,
#messageInput:focus-visible {
    outline: none;
    box-shadow: none;
}

#messageInput::placeholder {
    color: var(--color-text-muted);
}

/* 输入框工具栏 */
.chat-input-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.chat-input-toolbar-left,
.chat-input-toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* 深度思考按钮 */
.chat-deep-think-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.chat-deep-think-btn:hover {
    border-color: var(--color-text-secondary);
    color: var(--color-text-secondary);
}

.chat-deep-think-btn.active {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
    background: rgba(163, 230, 53, 0.08);
}

.chat-deep-think-btn .iconify {
    font-size: 16px;
}

.deep-think-label {
    font-weight: var(--font-weight-medium);
}

/* 发送按钮 - 圆形图标 */
.chat-send-btn {
    width: 36px;
    height: 36px;
    min-width: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chat-send-btn:hover {
    opacity: 0.85;
    transform: scale(1.05);
}

.chat-send-btn:disabled {
    background: var(--color-border);
    cursor: not-allowed;
    transform: none;
}

/* 发送按钮加载旋转动画 */
.spin-icon {
    animation: spin 1s linear infinite;
}

/* 移动端样式已移除 - 本阶段不做手机端适配 */

/* ========================================
   Markdown 内容样式
   ======================================== */
.markdown-body {
    line-height: 1.7;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.markdown-body p {
    margin-bottom: var(--spacing-sm);
}

.markdown-body p:last-child {
    margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1.4;
}

.markdown-body h1 { font-size: 1.5em; }
.markdown-body h2 { font-size: 1.3em; }
.markdown-body h3 { font-size: 1.15em; }
.markdown-body h4 { font-size: 1.05em; }

.markdown-body ul,
.markdown-body ol {
    margin: var(--spacing-sm) 0;
    padding-left: 24px;
    list-style-position: outside;
}

.markdown-body ul {
    list-style-type: disc;
}

.markdown-body ol {
    list-style-type: decimal;
}

.markdown-body li {
    margin-bottom: 4px;
    padding-left: 4px;
}

.markdown-body li > ul,
.markdown-body li > ol {
    margin: 4px 0;
}

.markdown-body ul ul,
.markdown-body ol ol,
.markdown-body ul ol,
.markdown-body ol ul {
    margin-top: 4px;
    margin-bottom: 4px;
}

/* 代码块 */
.markdown-body code {
    background: var(--color-bg-hover);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--color-text-primary);
}

.markdown-body pre {
    background: var(--color-bg-hover);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

.markdown-body pre code {
    background: transparent;
    padding: 0;
    font-size: 0.85em;
    line-height: 1.5;
}

/* 引用块 */
.markdown-body blockquote {
    margin: var(--spacing-sm) 0;
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 3px solid var(--brand-primary);
    background: var(--color-bg-hover);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text-secondary);
}

.markdown-body blockquote p:last-child {
    margin-bottom: 0;
}

/* 表格 */
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-sm) 0;
    font-size: 0.9em;
}

.markdown-body th,
.markdown-body td {
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.markdown-body th {
    background: var(--color-bg-hover);
    font-weight: var(--font-weight-medium);
}

.markdown-body tr:nth-child(even) {
    background: var(--color-bg-elevated);
}

/* 链接 */
.markdown-body a {
    color: var(--brand-primary);
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

/* 分割线 */
.markdown-body hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-md) 0;
}

/* 图片 */
.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--spacing-sm) 0;
}

/* 强调 */
.markdown-body strong {
    font-weight: var(--font-weight-semibold);
}

.markdown-body em {
    font-style: italic;
}

/* 删除线 */
.markdown-body del {
    text-decoration: line-through;
    color: var(--color-text-muted);
}

/* 任务列表 */
.markdown-body input[type="checkbox"] {
    margin-right: 6px;
    vertical-align: middle;
}

/* ========================================
   Alpha 2.0: Agent 切换 & 思考链
   ======================================== */

/* Agent 指示器 - 增强版 (UIUX 21.4.2) */
.agent-indicator {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-left: 48px; /* 为展开按钮留出空间 */
    background: linear-gradient(135deg, rgba(163, 230, 53, 0.08) 0%, rgba(15, 118, 110, 0.05) 100%);
    border-bottom: 1px solid rgba(163, 230, 53, 0.2);
    font-size: var(--font-size-sm);
    transition: all 200ms ease-out;
}

.agent-indicator.switching {
    opacity: 0;
    transform: translateY(-8px);
}

.agent-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
    border-radius: var(--radius-md);
    color: white;
    font-size: 20px;
}

.agent-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.agent-name {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.agent-role {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* 深色模式 Agent 指示器 */
.theme-dark .agent-indicator {
    background: linear-gradient(135deg, rgba(163, 230, 53, 0.05) 0%, rgba(15, 118, 110, 0.03) 100%);
    border-bottom-color: rgba(163, 230, 53, 0.15);
}

/* Agent 切换动画 */
@keyframes agentSwitchIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.agent-indicator.show {
    display: flex;
    animation: agentSwitchIn 200ms ease-out forwards;
}

/* Agent 过渡语 */
.agent-transition {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, rgba(163, 230, 53, 0.1) 0%, rgba(20, 184, 166, 0.1) 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-style: italic;
    color: var(--color-text-secondary);
    animation: fadeSlideIn 300ms ease-out;
}

.agent-transition .iconify {
    font-size: 18px;
}

/* 思考链 */
.thinking-chain {
    padding: var(--spacing-sm) 0;
    margin-bottom: var(--spacing-sm);
    border-bottom: 1px dashed var(--color-border);
}

.thinking-step {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    opacity: 0;
    animation: thinkingFadeIn 300ms ease-out forwards;
}

.thinking-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand-primary);
    animation: thinkingPulse 1.5s ease-in-out infinite;
}

.thinking-text {
    flex: 1;
}

@keyframes thinkingFadeIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes thinkingPulse {
    0%, 100% {
        opacity: 0.4;
        transform: scale(0.8);
    }
    50% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   无障碍：尊重减少动画偏好
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    /* 禁用所有动画 */
    .spin-icon,
    .thinking-dot,
    .agent-indicator,
    .agent-transition,
    .thinking-chain,
    .thinking-step,
    .message,
    .chat-sidebar,
    .chat-glow,
    .chat-wave-layer,
    .chat-particle {
        animation: none !important;
        transition: none !important;
    }
    
    /* 保持必要的状态变化但移除动画 */
    .chat-sidebar.open {
        transform: translateX(0);
    }
    
    /* 隐藏需要动画才有意义的元素（如加载旋转） */
    .spin-icon {
        animation: none;
    }
    
    /* 思考步骤直接显示 */
    .thinking-step {
        opacity: 1;
        transform: none;
    }
    
    /* 减少动画模式下直接隐藏海洋背景（最大限度降低功耗） */
    .chat-ocean-bg {
        display: none;
    }
}