/* DeepSeek 风格 - 简洁优雅 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #f7f7f8;
    --bg-secondary: #ffffff;
    --bg-chat: #ffffff;
    --bg-user-msg: #f7f7f8;
    --bg-ai-msg: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #6b6b6b;
    --border-color: #e5e5e5;
    --accent-color: #5a5a5a;
    --hover-bg: #f0f0f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.05);
    --sidebar-bg: #f7f7f8;
    --input-bg: #ffffff;
    --danger-bg: #fef2f2;
    --danger-border: #fecaca;
    --danger-text: #dc2626;
}

[data-theme="dark"] {
    --bg-primary: #212121;
    --bg-secondary: #2f2f2f;
    --bg-chat: #2f2f2f;
    --bg-user-msg: #2f2f2f;
    --bg-ai-msg: #262626;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --accent-color: #b0b0b0;
    --hover-bg: #3a3a3a;
    --shadow: 0 1px 3px rgba(0,0,0,0.2);
    --sidebar-bg: #1e1e1e;
    --input-bg: #2f2f2f;
    --danger-bg: #3b1c1c;
    --danger-border: #5c2828;
    --danger-text: #f87171;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===== 侧边栏 ===== */
.sidebar {
    width: 260px;
    min-width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
    height: 100vh;
    z-index: 100;
}

.sidebar.collapsed {
    margin-left: -260px;
}

.sidebar-header {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
}

.new-chat-btn {
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    transition: background 0.2s;
}

.new-chat-btn:hover {
    background: var(--hover-bg);
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.chat-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 2px;
    font-size: 14px;
    color: var(--text-primary);
    transition: background 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

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

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border-color);
}

.sidebar-btn {
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    transition: background 0.2s;
}

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

/* 侧边栏遮罩（仅移动端） */
.sidebar-overlay {
    display: none;
}

/* ===== 主容器 ===== */
.main-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-width: 0;
    background: var(--bg-chat);
}

/* ===== 顶部导航 ===== */
.top-nav {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    min-height: 52px;
}

.menu-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: none;
}

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

.chat-title {
    font-size: 16px;
    font-weight: 600;
}

/* ===== 消息容器 ===== */
.message-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    padding: 20px;
}

.welcome-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.welcome-screen h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

.welcome-screen p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.suggestion-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.chip {
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    transition: all 0.2s;
}

.chip:hover {
    background: var(--hover-bg);
    transform: translateY(-1px);
}

.message-list {
    max-width: 800px;
    margin: 0 auto;
}

/* ===== 消息气泡 ===== */
.message {
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.message-avatar {
    width: 28px;
    height: 28px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

.user-avatar {
    background: #e8f0fe;
}

.ai-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message-actions {
    margin-left: auto;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}

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

.action-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.2s;
}

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

.message-content {
    padding: 12px 16px;
    border-radius: 12px;
    line-height: 1.6;
    font-size: 15px;
}

.message:nth-child(odd) .message-content,
.message .user-message .message-content {
    background: var(--bg-user-msg);
}

.message:nth-child(even) .message-content,
.message .ai-message .message-content {
    background: var(--bg-ai-msg);
}

.message-content p {
    margin-bottom: 8px;
}

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

.message-content pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 12px 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 8px 0;
    font-size: 13px;
}

.message-content code {
    background: rgba(0,0,0,0.06);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

/* 编辑文本框 */
.edit-textarea {
    width: 100%;
    min-height: 60px;
    padding: 8px 12px;
    border: 1px solid #4f46e5;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 8px;
}

.edit-actions {
    display: flex;
    gap: 8px;
}

/* ===== 输入区域 ===== */
.input-area {
    padding: 16px 20px 12px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    max-width: 800px;
    margin: 0 auto;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px 12px;
    transition: border-color 0.2s;
}

.input-wrapper:focus-within {
    border-color: #4f46e5;
}

#messageInput {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    font-size: 15px;
    font-family: inherit;
    line-height: 1.5;
    max-height: 200px;
    background: transparent;
    color: var(--text-primary);
    padding: 4px 0;
}

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

.send-btn {
    background: #4f46e5;
    color: white;
    border: none;
    border-radius: 8px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: #4338ca;
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    max-width: 800px;
    margin: 6px auto 0;
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== 设置面板 ===== */
.settings-panel {
    position: fixed;
    right: 0;
    top: 0;
    width: 400px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    z-index: 1100;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

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

.settings-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.settings-header h2 {
    font-size: 18px;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0 4px;
    line-height: 1;
}

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

.settings-content {
    padding: 20px;
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.setting-hint {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    margin-top: -4px;
}

.setting-input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}

.setting-input:focus {
    border-color: #4f46e5;
}

.setting-textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.2s;
}

.setting-textarea:focus {
    border-color: #4f46e5;
}

.setting-range {
    width: 100%;
    margin-top: 4px;
}

/* ===== 背景设定词条 ===== */
.memory-field {
    margin-bottom: 16px;
}

.memory-field label,
.custom-field-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.custom-field {
    margin-bottom: 14px;
    position: relative;
}

.custom-field-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.custom-field-key {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}

.custom-field-key:focus {
    border-color: #4f46e5;
}

.remove-field-btn {
    background: transparent;
    border: none;
    color: var(--danger-text);
    cursor: pointer;
    font-size: 18px;
    padding: 2px 6px;
    border-radius: 4px;
    line-height: 1;
    transition: background 0.2s;
    flex-shrink: 0;
}

.remove-field-btn:hover {
    background: var(--danger-bg);
}

.custom-field-value {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    resize: vertical;
    min-height: 36px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.custom-field-value:focus {
    border-color: #4f46e5;
}

/* 亲密度滑块 */
.intimacy-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.intimacy-slider {
    flex: 1;
}

.intimacy-value {
    font-size: 16px;
    font-weight: 600;
    color: #4f46e5;
    min-width: 32px;
    text-align: right;
}

/* 添加词条按钮 */
.add-field-btn {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all 0.2s;
    margin-bottom: 24px;
}

.add-field-btn:hover {
    border-color: #4f46e5;
    color: #4f46e5;
    background: rgba(79, 70, 229, 0.04);
}

/* 附件上传 */
.attachment-list {
    margin-bottom: 8px;
}

.attachment-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 6px;
    font-size: 13px;
}

.attachment-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.attachment-size {
    color: var(--text-secondary);
    font-size: 12px;
    flex-shrink: 0;
}

.attachment-remove {
    background: transparent;
    border: none;
    color: var(--danger-text);
    cursor: pointer;
    font-size: 16px;
    padding: 0 4px;
    border-radius: 4px;
    line-height: 1;
    flex-shrink: 0;
}

.attachment-remove:hover {
    background: var(--danger-bg);
}

.upload-area {
    margin-top: 8px;
}

.file-input {
    display: none;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 13px;
    transition: all 0.2s;
}

.upload-label:hover {
    border-color: #4f46e5;
    color: #4f46e5;
    background: rgba(79, 70, 229, 0.04);
}

.upload-label.drag-over {
    border-color: #4f46e5;
    background: rgba(79, 70, 229, 0.08);
    color: #4f46e5;
}

.save-btn {
    margin-top: 8px;
    padding: 8px 16px;
    background: #4f46e5;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.save-btn:hover {
    background: #4338ca;
}

.primary-save-btn {
    width: 100%;
    padding: 10px;
    font-size: 15px;
    margin-top: 0;
}

.danger-btn {
    padding: 8px 16px;
    background: #ef4444;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.danger-btn:hover {
    background: #dc2626;
}

.secondary-btn {
    padding: 8px 16px;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

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

/* ===== 遮罩层 ===== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 1050;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* ===== Toast 提示 ===== */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-120px);
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 14px;
    z-index: 9999;
    transition: transform 0.3s ease;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast-success {
    background: #4f46e5;
    color: white;
}

.toast-error {
    background: #ef4444;
    color: white;
}

/* ===== 加载动画 ===== */
.typing-indicator {
    display: inline-flex;
    gap: 4px;
    padding: 12px 16px;
    background: var(--hover-bg);
    border-radius: 12px;
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        z-index: 1200;
        margin-left: -260px;
        box-shadow: 4px 0 20px rgba(0,0,0,0.15);
    }

    .sidebar.open {
        margin-left: 0;
    }

    .sidebar-overlay {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0,0,0,0.5);
        z-index: 1150;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .sidebar-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

    .menu-btn {
        display: block;
    }

    .settings-panel {
        width: 100%;
    }

    .message-container {
        padding: 12px;
    }

    .input-area {
        padding: 12px;
    }
}

/* ========== Auth Page ========== */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a3e 50%, #0f0f23 100%);
}
.auth-container {
    background: rgba(255,255,255,0.04);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 40px;
    width: 380px;
    max-width: 90vw;
}
.auth-header { text-align: center; margin-bottom: 28px; }
.auth-header h1 { font-size: 28px; margin: 0 0 8px; background: linear-gradient(135deg, #6366f1, #8b5cf6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.auth-header p { color: #9ca3af; font-size: 14px; margin: 0; }
.auth-tabs { display: flex; margin-bottom: 24px; background: rgba(255,255,255,0.05); border-radius: 10px; padding: 3px; }
.auth-tab { flex: 1; padding: 10px; border: none; background: transparent; color: #9ca3af; font-size: 14px; cursor: pointer; border-radius: 8px; transition: all 0.2s; }
.auth-tab.active { background: rgba(99,102,241,0.3); color: #fff; }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form input { padding: 12px 14px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: 10px; color: #fff; font-size: 14px; outline: none; transition: border-color 0.2s; }
.auth-form input:focus { border-color: #6366f1; }
.auth-msg { font-size: 13px; color: #9ca3af; min-height: 18px; }
.auth-btn { padding: 12px; background: linear-gradient(135deg, #6366f1, #8b5cf6); border: none; border-radius: 10px; color: #fff; font-size: 15px; font-weight: 600; cursor: pointer; transition: opacity 0.2s; }
.auth-btn:hover { opacity: 0.9; }

/* ========== Header user info ========== */
.current-user { color: #9ca3af; font-size: 13px; margin-right: 8px; }
.logout-btn { padding: 4px 12px; border: 1px solid rgba(255,255,255,0.15); background: transparent; color: #9ca3af; border-radius: 6px; font-size: 12px; cursor: pointer; transition: all 0.2s; }
.logout-btn:hover { border-color: #ef4444; color: #ef4444; }