/* Navigation design copied directly from index.html. */

        :root {
            /* 主色调 */
            --bg-primary: linear-gradient(135deg, #fafbfc 0%, #f1f5f9 100%);
            --bg-secondary: #ffffff;
            --bg-tertiary: #f8fafc;
            --bg-overlay: rgba(255, 255, 255, 0.85);
            --bg-backdrop: rgba(0, 0, 0, 0.4);
            
            /* 文字颜色 */
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-tertiary: #94a3b8;
            
            /* 强调色 */
            --accent-primary: #6366f1;
            --accent-hover: #4f46e5;
            --accent-light: #eef2ff;
            --accent-glow: rgba(99, 102, 241, 0.15);
            
            /* 边框与阴影 */
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.03);
            --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.04);
            --shadow-hover: 0 8px 24px rgba(99, 102, 241, 0.12), 0 16px 48px rgba(99, 102, 241, 0.08);
            
            /* 圆角 */
            --radius-lg: 24px;
            --radius-md: 18px;
            --radius-sm: 12px;
            --radius-full: 999px;
            
            /* 过渡 */
            --transition-smooth: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            
            /* 字体 */
            --font-family: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
        }
        body.mobile-menu-open {
            overflow: hidden;
        }
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 68px;
            background: var(--bg-overlay);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1002;
            box-shadow: var(--shadow-sm);
        }
        header .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            height: 100%;
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            padding: 0 32px;
        }
        header .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
            white-space: nowrap;
        }
        @media (max-width: 400px) {
            header .logo { font-size: 16px; }
            header .mobile-tab-btn { font-size: 12px; padding: 8px 12px; }
        }
        @media (max-width: 350px) {
            header .logo { font-size: 14px; }
            header .mobile-tab-btn { font-size: 11px; padding: 6px 10px; }
        }
        header .logo-icon {
            width: 36px;
            height: 36px;
            background: transparent;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            line-height: 1;
        }
        header .logo-text {
            display: flex;
            flex-direction: column;
            gap: 1px;
        }
        header .logo-subtitle {
            font-size: 11px;
            color: var(--text-tertiary);
            font-weight: 400;
        }
        header .logo-tagline {
            font-size: 10px;
            color: var(--text-tertiary);
            opacity: 0.7;
        }
        header .nav-tabs {
            display: flex;
            align-items: center;
            justify-content: center; /* PC端居中 */
            gap: 8px;
            background: var(--bg-tertiary);
            padding: 4px;
            border-radius: var(--radius-full);
            position: relative; /* 为指示器提供定位基准 */
            justify-self: center; /* 在grid布局中居中 */
        }
        header .tab-indicator {
            position: absolute;
            height: calc(100% - 8px); /* 减去padding */
            top: 4px;
            background: var(--bg-secondary);
            border-radius: var(--radius-full);
            box-shadow: var(--shadow-sm);
            transition: left 0.35s cubic-bezier(0.4, 0, 0.2, 1), width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            z-index: 0;
        }
        header .nav-tab {
            padding: 8px 20px;
            border-radius: var(--radius-full);
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition-smooth);
            cursor: pointer;
            position: relative;
            z-index: 1; /* 确保文字在指示器上方 */
        }
        header .nav-tab:hover {
            color: var(--text-primary);
        }
        header .nav-tab.active {
            color: var(--accent-primary);
            background: transparent; /* 让指示器提供背景 */
        }
        header .nav-tab-link {
            text-decoration: none;
            display: inline-flex;
            align-items: center;
        }
        header .nav-tab-link:hover {
            color: var(--accent-primary);
        }
        header .mobile-tab-link {
            background: transparent;
        }
        header .mobile-tab-link:hover {
            background: rgba(99, 102, 241, 0.1);
        }
        header .mobile-tab-link span {
            color: inherit;
        }
        header .user-area {
            display: flex;
            align-items: center;
            gap: 12px;
            justify-self: end; /* 在grid布局中靠右 */
        }
        header .user-avatar-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-full);
            overflow: hidden;
            cursor: pointer;
            transition: var(--transition-smooth);
            border: 2px solid transparent;
            background: var(--bg-tertiary);
        }
        header .user-avatar-btn:hover {
            transform: scale(1.05);
            border-color: var(--accent-primary);
        }
        header .user-avatar-btn img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        header .user-menu {
            position: absolute;
            top: 52px;
            right: 0;
            background: var(--bg-secondary);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-hover);
            min-width: 200px;
            display: none;
            z-index: 1001;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }
        header .user-menu.show {
            display: block;
            animation: fadeInDown 0.2s ease;
        }
        header .user-menu-header {
            padding: 16px;
            background: var(--bg-tertiary);
            border-bottom: 1px solid var(--border-color);
        }
        header .user-menu-name {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 14px;
        }
        header .user-menu-phone {
            font-size: 12px;
            color: var(--text-tertiary);
            margin-top: 2px;
        }
        header .user-menu-item {
            padding: 12px 16px;
            cursor: pointer;
            transition: var(--transition-smooth);
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        header .user-menu-item:hover {
            background: var(--accent-light);
            color: var(--accent-primary);
        }
        header .user-menu-item.danger:hover {
            background: #fef2f2;
            color: #ef4444;
        }
        header .user-menu-divider {
            height: 1px;
            background: var(--border-color);
            margin: 4px 0;
        }
        @media (min-width: 901px) {
            header .mobile-tab-selector { display: none !important; }
            header .nav-tabs { display: flex; }
            header .nav-container {
                display: grid;
                grid-template-columns: 1fr auto 1fr;
            }
            header .user-area {
                justify-self: end;
            }
        }
        @media (max-width: 900px) {
            header .nav-tabs { display: none; }
            header .mobile-tab-selector { display: flex; }
            header .nav-container {
                display: flex;
                justify-content: flex-start;
                align-items: center;
                gap: 8px;
            }
            header .logo {
                flex-shrink: 1;
                min-width: 0;
                overflow: hidden;
            }
            header .logo-text {
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
                max-width: 180px; /* 增大宽度让简介完整显示 */
            }
            header .mobile-tab-selector {
                flex-grow: 1;
                flex-shrink: 1;
                min-width: 100px;
                display: flex;
                position: relative;
                /* justify-content 由 JavaScript 动态设置 */
            }
            header .user-area {
                flex-shrink: 0;
                margin-left: auto;
            }
            header .mobile-tab-btn {
                display: flex;
                align-items: center;
                gap: 8px;
                padding: 10px 16px;
                background: rgba(255, 255, 255, 0.1);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                border: 1px solid rgba(255, 255, 255, 0.15);
                border-radius: 20px;
                color: var(--text-primary);
                font-size: 14px;
                font-weight: 500;
                cursor: pointer;
                transition: all 0.2s ease;
                white-space: nowrap;
            }
            header .mobile-tab-btn:hover {
                background: rgba(255, 255, 255, 0.15);
            }
            header .mobile-tab-arrow {
                transition: transform 0.3s ease;
                flex-shrink: 0;
            }
            header .mobile-tab-selector.open .mobile-tab-arrow {
                transform: rotate(180deg);
            }
            header .mobile-tab-selector.open .mobile-tab-btn {
                background: rgba(200, 200, 200, 0.25);
            }
            header .mobile-tab-menu {
                position: fixed;
                top: calc(68px + 8px);
                min-width: 140px;
                max-width: calc(100vw - 32px);
                background: white;
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                border: 1px solid rgba(99, 102, 241, 0.2);
                border-radius: 16px;
                padding: 8px;
                opacity: 0;
                visibility: hidden;
                transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease;
                z-index: 1001;
                box-shadow: 0 12px 40px rgba(99, 102, 241, 0.2);
                transform: translateY(-10px);
                /* left 由 JavaScript 动态设置 */
            }
            header .mobile-tab-selector.open .mobile-tab-menu {
                opacity: 1;
                visibility: visible;
                transform: translateY(0);
            }
            header .mobile-tab-item {
                opacity: 0;
                transform: translateY(-8px);
                transition: opacity 0.2s ease, transform 0.2s ease, background 0.2s ease;
            }
            header .mobile-tab-selector.open .mobile-tab-item:nth-child(1) {
                opacity: 1;
                transform: translateY(0);
                transition-delay: 0.05s;
            }
            header .mobile-tab-selector.open .mobile-tab-item:nth-child(2) {
                opacity: 1;
                transform: translateY(0);
                transition-delay: 0.1s;
            }
            header .mobile-tab-selector.open .mobile-tab-item:nth-child(3) {
                opacity: 1;
                transform: translateY(0);
                transition-delay: 0.15s;
            }
            header .mobile-tab-selector.open .mobile-tab-item:nth-child(4) {
                opacity: 1;
                transform: translateY(0);
                transition-delay: 0.2s;
            }
            header .mobile-tab-selector.open .mobile-tab-item:nth-child(5) {
                opacity: 1;
                transform: translateY(0);
                transition-delay: 0.25s;
            }
            header .logo-icon {
                display: none !important;
            }
            header .mobile-tab-item {
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 12px 16px;
                border-radius: 10px;
                color: #6366f1;
                font-size: 14px;
                cursor: pointer;
                transition: all 0.2s ease;
            }
            header .mobile-tab-item:hover {
                background: rgba(99, 102, 241, 0.1);
                color: #4f46e5;
            }
            header .mobile-tab-item.active {
                color: #4f46e5;
                font-weight: 600;
            }
            header .mobile-tab-item .check-icon {
                opacity: 0;
                color: #6366f1;
                transition: opacity 0.2s ease;
            }
            header .mobile-tab-item.active .check-icon {
                opacity: 1;
            }
            header .mobile-tab-overlay {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                bottom: 0;
                background: rgba(0, 0, 0, 0.3);
                opacity: 0;
                visibility: hidden;
                transition: opacity 0.25s ease, visibility 0.25s;
                z-index: 1000;
            }
            header .mobile-tab-selector.open .mobile-tab-overlay {
                opacity: 1;
                visibility: visible;
            }
        }
        @media (max-width: 640px) {
            header .nav-container {
                padding: 0 16px;
                /* 移动端使用flex布局，不覆盖900px的设置 */
            }
        }
header {font-family:var(--font-family);line-height:1.6;letter-spacing:.2px;padding:0;display:block;}
header,header *{box-sizing:border-box;}
header *{margin:0;padding:0;}
header button,header a{font-family:inherit;-webkit-tap-highlight-color:transparent;}
header a{color:inherit;text-decoration:none;cursor:pointer;}
header .logo-subtitle strong{font-weight:bolder;}
header .user-avatar-btn img{display:block;width:100%;height:100%;object-fit:cover;}
header .mobile-tab-menu{font-size:14px;}
@media(max-width:900px){
  header .mobile-tab-selector{min-width:max-content;}
  header .mobile-tab-overlay{height:calc(100vh - 68px);height:calc(100dvh - 68px);bottom:auto;}
}
@media(max-width:400px){header .mobile-tab-btn{font-size:12px;padding:8px 12px;}}
@media(max-width:350px){header .mobile-tab-btn{font-size:11px;padding:6px 10px;}}