/* ============================================
           基础变量 - CSS 主题定义
           ============================================ */
        :root {
            /* 颜色系统 - 深色主题 */
            --bg-primary: #060608;
            --bg-secondary: #131316;
            --bg-tertiary: #1a1a1f;
            --text-primary: #E7E3E2;
            --text-secondary: #999494;
            --text-muted: #737373;
            --accent-primary: rgba(255, 255, 255, 0.9);
            --accent-secondary: rgba(255, 255, 255, 0.6);
            --accent-glow: #A35B4A;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(255, 255, 255, 0.15);
            
            /* 字体系统 */
            --font-display: 'Plus Jakarta Sans', sans-serif;
            --font-body: 'Inter', sans-serif;
            
            /* 间距系统 */
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 24px;
            --space-xl: 32px;
            --space-2xl: 48px;
            --space-3xl: 64px;
            --space-4xl: 96px;
            --space-5xl: 128px;
            
            /* 圆角系统 */
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 32px;
            --radius-2xl: 24px;
            --radius-full: 9999px;
            
            /* 过渡动画 */
            --transition-fast: 150ms ease;
            --transition-base: 250ms ease;
            --transition-slow: 400ms ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        a { 
            color: #666; 
            text-decoration: none;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            background-image: 
                radial-gradient(circle at 20% 30%, rgba(106, 175, 255, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 80% 70%, rgba(202, 191, 255, 0.03) 0%, transparent 40%);
            background-attachment: fixed;
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* 环境光晕效果 */
        .ambient-glow {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -1;
            overflow: hidden;
        }

        .glow-1 {
            position: absolute;
            top: -10%;
            left: -10%;
            width: 40%;
            height: 40%;
            background: radial-gradient(circle, rgba(106, 175, 255, 0.08) 0%, transparent 70%);
            filter: blur(100px);
            animation: float 20s infinite alternate ease-in-out;
        }

        .glow-2 {
            position: absolute;
            bottom: 10%;
            right: -5%;
            width: 50%;
            height: 50%;
            background: radial-gradient(circle, rgba(202, 191, 255, 0.05) 0%, transparent 70%);
            filter: blur(120px);
            animation: float 25s infinite alternate-reverse ease-in-out;
        }

        @keyframes float {
            0% { transform: translate(0, 0) scale(1); }
            100% { transform: translate(10%, 10%) scale(1.1); }
        }

        /* ============================================
           布局容器
           ============================================ */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }

        .section {
            padding: var(--space-5xl) 0;
            position: relative;
        }

        /* 渐变文字效果 */
        .gradient-text, .section-title {
            background: linear-gradient(90deg, #cabfff, #fff 50%, #bfeaff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }

        /* ============================================
           按钮样式
           ============================================ */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            padding: var(--space-md) var(--space-xl);
            font-family: var(--font-body);
            font-size: 15px;
            font-weight: 500;
            text-decoration: none;
            border-radius: 999px;
            cursor: pointer;
            transition: all var(--transition-base);
            border: none;
            outline: none;
        }

        .btn-primary {
            background: rgba(255, 255, 255, 0.9);
            color: var(--bg-primary);
            box-shadow: 0 4px 20px rgba(255, 255, 255, 0.2);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            background: rgba(255, 255, 255, 1);
            box-shadow: 0 8px 30px rgba(255, 255, 255, 0.3);
        }

        /* ============================================
           1. 导航栏
           ============================================ */
        .header {
            position: fixed;
            top: 24px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1000;
            width: calc(100% - 48px);
            max-width: 900px;
        }

        .nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-sm) var(--space-lg);
            background: rgba(6, 6, 8, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-full);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-family: var(--font-display);
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            text-decoration: none;
        }

        .nav-logo-icon {
            width: 32px;
            height: 32px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 999px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .nav-logo-icon img {
            width: 20px;
            height: 20px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: var(--space-xl);
            list-style: none;
        }

        .nav-links a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
        }

        .nav-links a:hover {
            color: var(--text-primary);
        }

        /* ============================================
           2. 主内容区
           ============================================ */
        .hero {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding-top: 120px;
            padding-bottom: var(--space-4xl);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 20%;
            left: 50%;
            transform: translateX(-50%);

            width: 1000px;
            height: 800px;
            background: radial-gradient(circle, rgba(106, 175, 255, 0.08) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
            filter: blur(60px);
        }

        .hero-content {
            max-width: 800px;
            width: 100%;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }

        .hero-title {
            font-family: var(--font-display);
            font-size: 48px;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -0.03em;
            margin-bottom: var(--space-xl);
            text-align: center;
        }

        .tutorial-content {
            background: rgba(19, 19, 22, 0.7);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: var(--space-2xl);
            margin-top: var(--space-xl);
        }

        .tutorial-section {
            margin-bottom: var(--space-2xl);
            padding-bottom: var(--space-xl);
            border-bottom: 1px solid var(--border-subtle);
        }

        .tutorial-section:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .section-header {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            margin-bottom: var(--space-lg);
        }

        .step-number {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, rgba(106, 175, 255, 0.2) 0%, rgba(157, 206, 255, 0.3) 100%);
            border: 1px solid rgba(106, 175, 255, 0.3);
            border-radius: var(--radius-full);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 18px;
            color: #6aafff;
        }

        .section-title {
            font-family: var(--font-display);
            font-size: 24px;
            font-weight: 700;
            margin: 0;
        }

        .section-content {
            padding-left: 52px;
        }

        .instruction-item {
            margin-bottom: var(--space-md);
            padding: var(--space-md);
            background: rgba(255, 255, 255, 0.03);
            border-radius: var(--radius-lg);
            border-left: 3px solid rgba(106, 175, 255, 0.3);
            transition: all var(--transition-fast);
        }

        .instruction-item:hover {
            background: rgba(255, 255, 255, 0.05);
            border-left-color: rgba(106, 175, 255, 0.6);
        }

        .permission-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: var(--space-md);
            background: rgba(255, 255, 255, 0.02);
            border-radius: var(--radius-lg);
            overflow: hidden;
        }

        .permission-table th,
        .permission-table td {
            padding: var(--space-md);
            text-align: left;
            border-bottom: 1px solid var(--border-subtle);
        }

        .permission-table th {
            font-weight: 600;
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }

        .permission-table tr:last-child td {
            border-bottom: none;
        }

        .permission-table tr:hover {
            background: rgba(255, 255, 255, 0.03);
        }

        .tag {
            display: inline-block;
            padding: 4px 8px;
            font-size: 12px;
            font-weight: 600;
            border-radius: var(--radius-sm);
            margin-right: var(--space-xs);
        }

        .tag-required {
            background: rgba(255, 87, 87, 0.2);
            color: #ff5757;
            border: 1px solid rgba(255, 87, 87, 0.3);
        }

        .tag-optional {
            background: rgba(255, 193, 7, 0.2);
            color: #ffc107;
            border: 1px solid rgba(255, 193, 7, 0.3);
        }

        .tag-tool {
            background: rgba(0, 200, 83, 0.2);
            color: #00c853;
            border: 1px solid rgba(0, 200, 83, 0.3);
        }

        .tag-readonly {
            background: rgba(33, 150, 243, 0.2);
            color: #2196f3;
            border: 1px solid rgba(33, 150, 243, 0.3);
        }

        /* ============================================
           3. 页脚
           ============================================ */
        .footer {
            background: var(--bg-primary);
            padding: var(--space-3xl) 0;
            border-top: 1px solid var(--border-subtle);
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--space-lg);
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-family: var(--font-display);
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .footer-brand-icon {
            width: 28px;
            height: 28px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .footer-brand-icon img {
            width: 16px;
            height: 16px;
        }

        .footer-copyright {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ============================================
           响应式设计
           ============================================ */
        @media (max-width: 768px) {
            .hero-title {
                font-size: 36px;
            }
            
            .nav-links {
                display: none;
            }
            
            .section-content {
                padding-left: 0;
            }
            
            .permission-table {
                font-size: 14px;
            }
            
            .permission-table th,
            .permission-table td {
                padding: var(--space-sm);
            }
            
            .footer-content {
                flex-direction: column;
                text-align: center;
                gap: var(--space-xl);
            }
        }