/* ============================================================
   AI 伴侣 — PWA 样式表（克制深色玻璃版）

   设计参考 Apple 官网：
   - 纯黑背景，文字以白/灰层级区分
   - 大留白、无重阴影、无装饰性渐变
   - 玻璃质感仅用于表面区分，克制的单一强调色
   ============================================================ */

/* --- CSS 变量 ------------------------------------------------- */
:root {
    /* 颜色系统 */
    --bg-primary: #000000;
    --bg-secondary: rgba(255, 255, 255, 0.045);
    --bg-input: rgba(255, 255, 255, 0.06);
    --bg-bubble-user: rgba(212, 168, 83, 0.16);
    --bg-bubble-ai: rgba(255, 255, 255, 0.06);
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --text-tertiary: #6e6e73;
    --text-bubble: #f5f5f7;
    --accent: #d4a853;
    --accent-hover: #e0b868;
    --accent-ink: #0a0a0a;
    --border: rgba(255, 255, 255, 0.09);
    --glass-highlight: rgba(255, 255, 255, 0.08);

    /* 状态颜色 */
    --status-connected: #30d158;
    --status-connecting: #ffd60a;
    --status-disconnected: #ff453a;

    /* 布局 */
    --header-height: 54px;
    --input-height: 58px;
    --safe-bottom: env(safe-area-inset-bottom, 8px);

    /* 字体 */
    --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "SF Mono", "Cascadia Code", Consolas, monospace;
}

/* --- 基础重置 ------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
}

body {
    font-family: var(--font-system);
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
}

/* 极淡的环境光晕，避免纯黑过于生硬 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(600px 400px at 80% -10%, rgba(255,255,255,0.04), transparent 60%),
        radial-gradient(500px 400px at 0% 100%, rgba(212,168,83,0.03), transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* --- 应用容器 ------------------------------------------------- */
#app {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 720px;
    margin: 0 auto;
}

/* --- 顶部栏 --------------------------------------------------- */
#header {
    display: flex;
    align-items: center;
    height: var(--header-height);
    padding: 0 16px;
    background: rgba(0, 0, 0, 0.55);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(24px) saturate(140%);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
    flex-shrink: 0;
}

#header-title {
    flex: 1;
    font-size: 17px;
    font-weight: 500;
    text-align: center;
    margin-right: 8px;
    letter-spacing: -0.01em;
}

#settings-btn {
    margin-right: 8px;
}

#clear-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 5px 14px;
    border-radius: 999px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}
#clear-btn:active {
    background: rgba(255,255,255,0.08);
    color: var(--text-primary);
}

/* 连接状态指示点 */
.status-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    flex-shrink: 0;
    transition: background-color 0.3s;
}
.status-dot.connected { background: var(--status-connected); }
.status-dot.connecting { background: var(--status-connecting); }
.status-dot.disconnected { background: var(--status-disconnected); }

/* --- 聊天区域 ------------------------------------------------- */
#chat-container {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
}

#messages {
    padding: 18px 14px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* 消息行 */
.message-row {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    gap: 8px;
    max-width: 85%;
    animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

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

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

/* AI 头像 */
.ai-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--border);
}

.ai-avatar-placeholder {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    flex-shrink: 0;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    border: 1px solid var(--border);
}

/* 气泡包装 — 包含气泡和时间戳 */
.message-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.message-row.user .message-content {
    align-items: flex-end;
}

.message-row.ai .message-content {
    align-items: flex-start;
}

/* 气泡 */
.bubble {
    padding: 12px 16px;
    border-radius: 20px;
    font-size: 15px;
    line-height: 1.55;
    word-break: break-word;
    overflow-wrap: break-word;
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid var(--border);
}

.message-row.user .bubble {
    background: var(--bg-bubble-user);
    color: var(--text-bubble);
    border-bottom-right-radius: 6px;
    border-color: rgba(212, 168, 83, 0.16);
}

.message-row.ai .bubble {
    background: var(--bg-bubble-ai);
    color: var(--text-bubble);
    border-bottom-left-radius: 6px;
}

/* AI 正在输入指示器 */
.bubble.streaming::after {
    content: "";
    display: inline-block;
    width: 6px;
    height: 14px;
    background: var(--accent);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: blink 0.8s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* 消息时间戳 */
.timestamp {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 4px;
    padding: 0 4px;
}

/* 系统消息（错误、提示等） */
.system-message {
    align-self: center;
    font-size: 12px;
    color: var(--text-secondary);
    background: rgba(255,255,255,0.05);
    padding: 6px 16px;
    border-radius: 999px;
    max-width: 90%;
    text-align: center;
    border: 1px solid var(--border);
}

.system-message.error {
    color: var(--status-disconnected);
    border: 1px solid rgba(255, 69, 58, 0.35);
    background: rgba(255, 69, 58, 0.06);
}

/* 缺少 API Key 的持久提示条 — 可点击打开设置 */
.no-api-key-banner {
    color: var(--status-connecting) !important;
    border: 1px solid rgba(255, 214, 10, 0.35);
    background: rgba(255, 214, 10, 0.06);
    cursor: pointer;
    transition: background 0.2s;
}

.no-api-key-banner:hover {
    background: rgba(255, 214, 10, 0.12);
}

/* --- 输入区域 ------------------------------------------------- */
#input-area {
    flex-shrink: 0;
    padding: 8px 12px;
    padding-bottom: calc(8px + var(--safe-bottom));
    background: rgba(0, 0, 0, 0.5);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(24px) saturate(140%);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
}

#input-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 4px 4px 4px 18px;
}

#message-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 15px;
    font-family: var(--font-system);
    -webkit-appearance: none;
    appearance: none;
}

#message-input::placeholder {
    color: var(--text-tertiary);
    opacity: 0.7;
}

#send-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    color: var(--accent-ink);
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.2s, transform 0.1s;
    -webkit-tap-highlight-color: transparent;
}

#send-btn:active {
    transform: scale(0.94);
    background: var(--accent-hover);
}

#send-btn:disabled {
    background: rgba(255,255,255,0.08);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

/* --- 空状态 --------------------------------------------------- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    padding: 32px;
}

.empty-state .welcome-icon {
    font-size: 46px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state .welcome-text {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state .welcome-hint {
    font-size: 13px;
    opacity: 0.55;
}

/* --- 滚动条（桌面端） ----------------------------------------- */
#chat-container::-webkit-scrollbar {
    width: 4px;
}
#chat-container::-webkit-scrollbar-track {
    background: transparent;
}
#chat-container::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.12);
    border-radius: 2px;
}

/* --- 登录/注册遮罩层 ------------------------------------------- */
#login-overlay {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(28px) saturate(120%);
    -webkit-backdrop-filter: blur(28px) saturate(120%);
    z-index: 1000;
}

#login-box {
    text-align: center;
    padding: 34px 30px;
    max-width: 400px;
    width: 90%;
    background: rgba(22, 22, 23, 0.7);
    border: 1px solid var(--border);
    border-radius: 24px;
    backdrop-filter: blur(32px) saturate(140%);
    -webkit-backdrop-filter: blur(32px) saturate(140%);
}

#login-box h2 {
    color: var(--text-primary);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
}

/* 标签切换 */
.auth-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    padding: 4px;
    border-radius: 999px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
}

.auth-tab {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 999px;
    font-family: var(--font-system);
}

.auth-tab.active {
    background: rgba(255,255,255,0.1);
    color: var(--text-primary);
    font-weight: 500;
}

.auth-tab:not(.active):hover {
    background: rgba(255,255,255,0.06);
    color: var(--text-primary);
}

/* 表单容器 */
.auth-form {
    display: none;
    flex-direction: column;
    gap: 12px;
}

.auth-form.active {
    display: flex;
}

.auth-form input {
    width: 100%;
    padding: 13px 16px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
    font-family: var(--font-system);
}

.auth-form input::placeholder {
    color: var(--text-tertiary);
}

.auth-form input:focus {
    border-color: rgba(212, 168, 83, 0.45);
    background: rgba(255,255,255,0.08);
}

.auth-form button[type="submit"] {
    width: 100%;
    padding: 13px;
    border: none;
    border-radius: 14px;
    background: var(--accent);
    color: var(--accent-ink);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    font-family: var(--font-system);
}

.auth-form button[type="submit"]:active {
    transform: scale(0.98);
    background: var(--accent-hover);
}

.auth-form button[type="submit"]:disabled {
    background: rgba(255,255,255,0.08);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.login-error {
    color: var(--status-disconnected) !important;
    font-size: 13px !important;
    margin-top: 12px !important;
    margin-bottom: 0 !important;
    min-height: 20px;
}

.login-info {
    color: var(--status-connected) !important;
    font-size: 13px !important;
    margin-top: 8px !important;
    margin-bottom: 0 !important;
    min-height: 20px;
}

/* --- 设置面板遮罩层 ------------------------------------------- */
#settings-overlay {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(24px) saturate(120%);
    -webkit-backdrop-filter: blur(24px) saturate(120%);
    z-index: 1100;
    animation: fadeIn 0.2s ease-out;
}

#settings-panel {
    background: rgba(22, 22, 23, 0.78);
    border: 1px solid var(--border);
    border-radius: 22px;
    max-width: 440px;
    width: 92%;
    max-height: 85vh;
    overflow-y: auto;
    backdrop-filter: blur(32px) saturate(140%);
    -webkit-backdrop-filter: blur(32px) saturate(140%);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 22px 14px;
    border-bottom: 1px solid var(--border);
}

.settings-header h3 {
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
}

.settings-body {
    padding: 18px 22px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.settings-label {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    margin-top: 4px;
}

.settings-body input,
.settings-body textarea {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-system);
    outline: none;
    transition: border-color 0.2s, background 0.2s;
}

.settings-body input:focus,
.settings-body textarea:focus {
    border-color: rgba(212, 168, 83, 0.4);
    background: rgba(255,255,255,0.08);
}

.settings-body textarea {
    resize: vertical;
    min-height: 80px;
}

.apikey-wrapper {
    display: flex;
    gap: 6px;
}

.apikey-wrapper input {
    flex: 1;
}

.toggle-vis-btn {
    flex-shrink: 0;
    width: 44px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    transition: background 0.2s;
}

.toggle-vis-btn:active {
    background: rgba(255,255,255,0.1);
}

.settings-hint {
    color: var(--text-tertiary);
    font-size: 11px;
    opacity: 0.85;
    margin-top: -4px;
}

.settings-footer {
    padding: 14px 22px 18px;
    border-top: 1px solid var(--border);
}

.primary-btn {
    width: 100%;
    padding: 13px;
    border: none;
    border-radius: 14px;
    background: var(--accent);
    color: var(--accent-ink);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    font-family: var(--font-system);
}

.primary-btn:active {
    transform: scale(0.98);
    background: var(--accent-hover);
}

.primary-btn:disabled {
    background: rgba(255,255,255,0.08);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.settings-msg {
    color: var(--status-connected);
    font-size: 13px;
    text-align: center;
    margin-top: 8px;
    min-height: 20px;
}

.settings-msg.error {
    color: var(--status-disconnected);
}

/* 头像上传 */
.avatar-upload-section {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.settings-avatar-preview {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.avatar-upload-controls {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.avatar-upload-controls .settings-hint {
    margin-top: 0;
}

/* 账号信息区 */
.settings-account {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 22px;
    border-top: 1px solid var(--border);
}

#current-username {
    color: var(--text-secondary);
    font-size: 13px;
}

.danger-btn {
    padding: 7px 16px;
    border: 1px solid rgba(255, 69, 58, 0.35);
    border-radius: 999px;
    background: transparent;
    color: var(--status-disconnected);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-system);
}

.danger-btn:active {
    background: rgba(255, 69, 58, 0.1);
    color: white;
}

/* 图标按钮（设置齿轮、关闭×） */
.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 34px;
    height: 34px;
    border-radius: 50%;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.icon-btn:active {
    background: rgba(255,255,255,0.08);
    color: var(--text-primary);
}

/* --- 响应式：大屏适配 ----------------------------------------- */
@media (min-width: 768px) {
    #app {
        height: 100vh;
    }
    #messages {
        padding: 20px 24px;
    }
    .message-row {
        max-width: 70%;
    }
}