/* 组件样式 - 心灵伴侣 */
/* 基于 DESIGN.md 的产品UI规范 */

/* ========== 应用容器 ========== */
.app-container {
    display: flex;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    background-color: var(--bg);
    color: var(--ink);
    font-family: var(--font-family-primary);
}

/* ========== 侧边栏 ========== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transform: translateX(0);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-sticky);
    flex-shrink: 0;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border);
}

.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background-color: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: var(--font-family-primary);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out),
                opacity var(--duration-fast) var(--ease-out);
}

.new-chat-btn:hover {
    background-color: var(--primary-light);
}

.new-chat-btn:active {
    background-color: var(--primary-dark);
}

.new-chat-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.new-chat-btn i {
    width: 16px;
    height: 16px;
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2);
}

.conversation-group {
    margin-bottom: var(--space-4);
}

.conversation-group-title {
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    color: var(--muted);
    padding: var(--space-2) var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
    position: relative;
    min-height: 44px;
}

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

.conversation-item:active {
    background-color: var(--bg-active);
}

.conversation-item.active {
    background-color: var(--bg-hover);
}

/* 激活指示器 - 使用微妙的背景色变化而非边框 */
.conversation-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background-color: var(--primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.conversation-item-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg);
    border-radius: var(--radius-md);
    color: var(--muted);
    flex-shrink: 0;
}

.conversation-item-content {
    flex: 1;
    min-width: 0;
}

.conversation-item-title {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--ink);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item-preview {
    font-size: var(--text-xs);
    color: var(--muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item-delete {
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
    min-width: 28px;
    min-height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.conversation-item-delete:hover {
    background-color: var(--error);
    color: white;
}

.conversation-item-delete:focus-visible {
    outline: 2px solid var(--error);
    outline-offset: 2px;
}

.conversation-item-delete i {
    width: 14px;
    height: 14px;
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border);
}

.settings-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: var(--font-family-primary);
    font-size: var(--text-sm);
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.settings-btn:hover {
    background-color: var(--bg-hover);
    color: var(--ink);
}

.settings-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.settings-btn i {
    width: 18px;
    height: 18px;
}

/* ========== 主聊天区域 ========== */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background-color: var(--bg);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: 0 var(--space-6);
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    height: var(--header-height);
    flex-shrink: 0;
}

/* ========== 角色选择器 ========== */
.role-selector {
    position: relative;
}

.role-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--ink);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.role-btn:hover {
    border-color: var(--primary);
}

.role-btn svg {
    transition: transform var(--duration-fast) var(--ease-out);
}

.role-btn.open svg {
    transform: rotate(180deg);
}

.role-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--space-2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--duration-fast) var(--ease-out);
    z-index: var(--z-dropdown);
}

.role-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.role-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
}

.role-option:hover {
    background-color: var(--bg-hover);
}

.role-option:first-child {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.role-option:last-child {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.role-option svg {
    color: var(--primary);
    flex-shrink: 0;
}

.role-option-title {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--ink);
}

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

/* ========== 角色选择模态框 ========== */
.role-modal-overlay {
    position: fixed;
    inset: 0;
    background: oklch(0 0 0 / 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    animation: fadeIn var(--duration-fast) var(--ease-out);
}

.role-modal {
    background: var(--surface);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    width: 100%;
    max-width: 400px;
    margin: 0 var(--space-5);
    box-shadow: var(--shadow-lg);
    animation: fadeInUp var(--duration-normal) var(--ease-out);
}

.role-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.role-modal-header h3 {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
}

.role-modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
}

.role-modal-close:hover {
    background-color: var(--bg-hover);
}

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

.role-modal-option {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.role-modal-option:hover {
    border-color: var(--primary);
    background-color: var(--bg-hover);
}

.role-modal-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.role-modal-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.role-modal-title {
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    color: var(--ink);
    margin-bottom: var(--space-1);
}

.role-modal-desc {
    font-size: var(--text-sm);
    color: var(--muted);
}

.menu-btn {
    display: none;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.menu-btn:hover {
    background-color: var(--bg-hover);
    color: var(--ink);
}

.menu-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.menu-btn i {
    width: 20px;
    height: 20px;
}

@media (max-width: 768px) {
    .menu-btn {
        display: flex;
    }
}

.chat-title {
    font-family: var(--font-family-primary);
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--ink);
    flex: 1;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.theme-toggle,
.clear-chat {
    padding: var(--space-2);
    border-radius: var(--radius-md);
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.theme-toggle:hover,
.clear-chat:hover {
    background-color: var(--bg-hover);
    color: var(--ink);
}

.theme-toggle:focus-visible,
.clear-chat:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.theme-toggle i,
.clear-chat i {
    width: 18px;
    height: 18px;
}

/* ========== 消息容器 ========== */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6);
}

.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-12) var(--space-4);
    max-width: 480px;
    margin: 0 auto;
}

.welcome-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
}

.welcome-icon i {
    width: 32px;
    height: 32px;
    color: white;
}

.welcome-message h2 {
    font-family: var(--font-family-primary);
    font-size: var(--text-2xl);
    font-weight: var(--weight-semibold);
    color: var(--ink);
    margin-bottom: var(--space-3);
    text-wrap: balance;
}

.welcome-message p {
    font-size: var(--text-base);
    color: var(--muted);
    margin-bottom: var(--space-2);
    line-height: var(--leading-relaxed);
    max-width: 40ch;
}

/* ========== 消息列表 ========== */
.message-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    max-width: var(--max-content-width);
    margin: 0 auto;
    width: 100%;
}

/* ========== 思考内容（可折叠） ========== */
.think-section {
    margin-bottom: var(--space-2);
}

.think-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--muted);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    width: 100%;
    text-align: left;
}

.think-toggle:hover {
    background: var(--bg-hover);
    color: var(--ink);
}

.think-toggle .think-icon {
    transition: transform var(--duration-fast) var(--ease-out);
    flex-shrink: 0;
}

.think-toggle.expanded .think-icon {
    transform: rotate(90deg);
}

.think-content {
    display: none;
    padding: var(--space-3);
    background: var(--bg);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    font-size: var(--text-sm);
    color: var(--muted);
    line-height: var(--leading-relaxed);
}

.think-content.expanded {
    display: block;
    animation: fadeIn var(--duration-fast) var(--ease-out);
}

.thinking-spinner {
    animation: spin 1s linear infinite;
}

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

/* ========== 消息气泡 ========== */
.message {
    display: flex;
    gap: var(--space-3);
    max-width: var(--message-max-width);
    animation: messageSlideIn var(--duration-slow) var(--ease-out);
}

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

.message.ai {
    align-self: flex-start;
}

.message-avatar {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    flex-shrink: 0;
    background-color: var(--surface);
    box-shadow: var(--shadow-sm);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent), oklch(0.650 0.110 65));
}

.message.ai .message-avatar {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.message-avatar i {
    width: 18px;
    height: 18px;
    color: white;
}

.message-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.message-bubble {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-xl);
    line-height: var(--leading-relaxed);
    word-break: break-word;
    font-size: var(--text-base);
    box-shadow: var(--shadow-sm);
    transition: transform var(--duration-fast) var(--ease-out);
}

.message-bubble:hover {
    transform: translateY(-1px);
}

.message.user .message-bubble {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-bottom-right-radius: var(--radius-sm);
}

.message.ai .message-bubble {
    background-color: var(--surface);
    color: var(--ink);
    border-bottom-left-radius: var(--radius-sm);
}

.message-bubble p {
    margin-bottom: var(--space-2);
}

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

.message-bubble code {
    background-color: oklch(0 0 0 / 0.15);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: var(--font-family-mono);
    font-size: 0.875em;
}

.message-bubble pre {
    background-color: oklch(0 0 0 / 0.2);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-2) 0;
}

.message-bubble pre code {
    background: none;
    padding: 0;
}

.message-time {
    font-size: var(--text-xs);
    color: var(--muted);
    padding: 0 var(--space-1);
}

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

/* ========== 打字指示器 ========== */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--space-3) var(--space-4);
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: var(--muted);
    border-radius: var(--radius-full);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

/* ========== 输入区域 ========== */
.input-area {
    padding: var(--space-4) var(--space-6);
    background-color: var(--bg);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: var(--space-3);
    max-width: var(--max-content-width);
    margin: 0 auto;
    background-color: var(--surface);
    border: 1px solid transparent;
    border-radius: 24px;
    padding: var(--space-3) var(--space-4);
    transition: border-color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.input-container:focus-within {
    border-color: var(--primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.input-container.loading {
    opacity: 0.7;
    pointer-events: none;
}

.message-input {
    flex: 1;
    min-height: 24px;
    max-height: 150px;
    resize: none;
    background: transparent;
    color: var(--ink);
    font-family: var(--font-family-primary);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    padding: var(--space-1) 0;
    border: none;
    outline: none;
}

.message-input::placeholder {
    color: var(--muted);
}

.send-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.send-btn:hover:not(:disabled) {
    background-color: var(--primary-light);
    transform: scale(1.05);
}

.send-btn:active:not(:disabled) {
    background-color: var(--primary-dark);
    transform: scale(0.95);
}

.send-btn:disabled {
    background-color: oklch(0.150 0.005 250);
    color: oklch(0.350 0.005 250);
    cursor: not-allowed;
    opacity: 0.5;
}

.send-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.send-btn i {
    width: 16px;
    height: 16px;
}

.input-hint {
    text-align: center;
    font-size: var(--text-xs);
    color: var(--muted);
    margin-top: var(--space-2);
    max-width: var(--max-content-width);
    margin-left: auto;
    margin-right: auto;
}

/* ========== 设置面板 ========== */
.settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 320px;
    height: 100vh;
    height: 100dvh;
    background-color: var(--surface);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform var(--duration-slow) var(--ease-out);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
}

.settings-panel.open {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border);
}

.settings-header h2 {
    font-family: var(--font-family-primary);
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--ink);
}

.close-settings {
    padding: var(--space-2);
    border-radius: var(--radius-md);
    color: var(--muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.close-settings:hover {
    background-color: var(--bg-hover);
    color: var(--ink);
}

.close-settings:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.close-settings i {
    width: 18px;
    height: 18px;
}

.settings-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6);
}

.setting-group {
    margin-bottom: var(--space-8);
}

.setting-group h3 {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--muted);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.theme-options,
.font-size-options {
    display: flex;
    gap: var(--space-2);
}

.theme-option,
.font-size-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3);
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--muted);
    font-family: var(--font-family-primary);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: border-color var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.theme-option:hover,
.font-size-option:hover {
    border-color: var(--primary);
    color: var(--ink);
}

.theme-option.active,
.font-size-option.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

.theme-option:focus-visible,
.font-size-option:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.theme-option i {
    width: 16px;
    height: 16px;
}

/* ========== 空状态 ========== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
    text-align: center;
}

.empty-state-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-hover);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.empty-state-icon i {
    width: 28px;
    height: 28px;
    color: var(--muted);
}

.empty-state h3 {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--ink);
    margin-bottom: var(--space-2);
}

.empty-state p {
    font-size: var(--text-sm);
    color: var(--muted);
}

/* ========== 错误状态 ========== */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8);
    text-align: center;
}

.error-state-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: oklch(0.620 0.180 25 / 0.1);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-4);
}

.error-state-icon i {
    width: 28px;
    height: 28px;
    color: var(--error);
}

.error-state h3 {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--ink);
    margin-bottom: var(--space-2);
}

.error-state p {
    font-size: var(--text-sm);
    color: var(--muted);
    margin-bottom: var(--space-4);
}

.retry-btn {
    padding: var(--space-3) var(--space-6);
    background-color: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: var(--font-family-primary);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
}

.retry-btn:hover {
    background-color: var(--primary-light);
}

.retry-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ========== 加载状态 ========== */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

/* ========== 侧边栏遮罩层 ========== */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: oklch(0 0 0 / 0.5);
    z-index: calc(var(--z-modal) - 1);
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-out);
}

/* ========== 字符计数 ========== */
.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-content-width);
    margin: var(--space-2) auto 0;
}

.char-count {
    font-size: var(--text-xs);
    color: var(--muted);
}

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

/* ========== 响应式调整 ========== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        height: 100dvh;
        z-index: var(--z-modal);
        width: 85%;
        max-width: 300px;
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

    .sidebar:not(.collapsed) ~ .sidebar-overlay {
        display: block;
        opacity: 1;
    }

    .chat-header {
        padding: 0 var(--space-4);
    }

    .chat-title {
        font-size: var(--text-base);
    }

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

    .message {
        max-width: 85%;
    }

    .message-avatar {
        width: 28px;
        height: 28px;
    }

    .message-avatar i {
        width: 14px;
        height: 14px;
    }

    .message-bubble {
        padding: var(--space-2) var(--space-3);
        font-size: var(--text-sm);
    }

    .input-area {
        padding: var(--space-3) var(--space-4);
    }

    .input-container {
        padding: var(--space-2) var(--space-3);
    }

    .send-btn {
        width: 32px;
        height: 32px;
    }

    .send-btn i {
        width: 14px;
        height: 14px;
    }

    .settings-panel {
        width: 100%;
    }

    .welcome-message {
        padding: var(--space-8) var(--space-4);
    }

    .welcome-icon {
        width: 56px;
        height: 56px;
    }

    .welcome-icon i {
        width: 28px;
        height: 28px;
    }

    .welcome-message h2 {
        font-size: var(--text-xl);
    }

    .welcome-message p {
        font-size: var(--text-sm);
    }
}

/* 小屏幕手机 */
@media (max-width: 375px) {
    .sidebar {
        width: 100%;
        max-width: none;
    }

    .message {
        max-width: 90%;
    }
}

/* 平板设备 */
@media (min-width: 769px) and (max-width: 1024px) {
    .sidebar {
        width: 260px;
    }

    .messages-container {
        padding: var(--space-5);
    }
}

/* 大屏幕 */
@media (min-width: 1440px) {
    .messages-container {
        padding: var(--space-8);
    }

    .message {
        max-width: 65%;
    }
}

/* 横屏模式 */
@media (orientation: landscape) and (max-height: 500px) {
    .chat-header {
        height: 48px;
    }

    .input-area {
        padding: var(--space-2) var(--space-4);
    }

    .welcome-message {
        padding: var(--space-4) var(--space-3);
    }

    .welcome-icon {
        width: 48px;
        height: 48px;
        margin-bottom: var(--space-3);
    }

    .welcome-icon i {
        width: 24px;
        height: 24px;
    }
}

/* ========== 减少动画 ========== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .message {
        animation: none;
    }

    .typing-indicator span {
        animation: none;
    }
}

/* ========== 欢迎头像 ========== */
.welcome-avatar {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    object-fit: cover;
    margin-bottom: var(--space-6);
    border: 2px solid var(--border);
}

/* ========== 附件按钮 ========== */
.attach-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    color: var(--muted);
    cursor: pointer;
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
    flex-shrink: 0;
}

.attach-btn:hover {
    background-color: var(--bg-hover);
    color: var(--ink);
}

.attach-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.attach-btn i {
    width: 18px;
    height: 18px;
}

/* ========== 媒体预览区域 ========== */
.media-preview {
    max-width: var(--max-content-width);
    margin: 0 auto var(--space-3);
    padding: var(--space-3);
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.media-preview-content {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    min-width: 0;
}

.media-preview-item {
    position: relative;
    display: inline-flex;
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--bg);
}

.media-preview-item img {
    max-width: 120px;
    max-height: 80px;
    object-fit: cover;
    display: block;
}

.media-preview-item video {
    max-width: 160px;
    max-height: 80px;
    object-fit: cover;
    display: block;
}

.media-preview-item-remove {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: oklch(0 0 0 / 0.6);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
}

.media-preview-item-remove:hover {
    background-color: var(--error);
}

.media-preview-item-remove i {
    width: 12px;
    height: 12px;
}

.media-preview-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--muted);
    cursor: pointer;
    flex-shrink: 0;
    transition: color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.media-preview-close:hover {
    background-color: var(--bg-hover);
    color: var(--ink);
}

.media-preview-close i {
    width: 16px;
    height: 16px;
}

/* ========== 消息媒体附件 ========== */
.message-media {
    margin-top: var(--space-2);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.message-media img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    display: block;
    border-radius: var(--radius-md);
}

.message-media video {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    display: block;
    border-radius: var(--radius-md);
}

/* ========== 对话列表删除按钮优化 ========== */
.conversation-item-delete {
    opacity: 0;
    transition: opacity var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
}

.conversation-item:hover .conversation-item-delete {
    opacity: 1;
}

/* 触摸设备始终显示 */
@media (hover: none) {
    .conversation-item-delete {
        opacity: 0.6;
    }
}

/* ========== 消息气泡媒体 ========== */
.message-bubble:has(.message-media) {
    padding: var(--space-2);
}

.message-bubble:has(.message-media) p {
    padding: 0 var(--space-2);
}