:root {
            --primary: #ec608f;
            --primary-hover: #d84b7a;
            --primary-light: rgba(236, 96, 143, 0.12);
            --bg: #0b0f19;
            --surface: #141a29;
            --surface-hover: #1b2336;
            --surface-border: rgba(236, 96, 143, 0.18);
            --main-text: #f3f4f6;
            --muted-text: #9ca3af;
            --radius: 10px;
            --transition: 0.15s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg);
            color: var(--main-text);
            line-height: 1.7;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        .envelope {
            width: 100%;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .airspace {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部导航 */
        .vista {
            background: rgba(20, 26, 41, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--surface-border);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .vector {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .nose {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .nose img {
            height: 38px;
            width: auto;
            display: block;
        }

        .azimuth {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            min-width: 0;
        }

        .rudder {
            color: var(--muted-text);
            text-decoration: none;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            border-radius: 6px;
            transition: color var(--transition), background-color var(--transition);
            word-break: break-word;
        }

        .rudder:hover {
            color: var(--main-text);
            background: var(--primary-light);
        }

        .rudder.active {
            color: var(--primary);
            background: rgba(236, 96, 143, 0.15);
            font-weight: 600;
        }

        /* 主体架构 */
        .updraft {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 64px;
            padding: 48px 0 80px;
        }

        /* Section 1: Hero / Intro */
        .zenith {
            padding: 32px 0 16px;
        }

        .skybox {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            align-items: center;
        }

        .flap {
            flex: 1 1 500px;
            min-width: 0;
        }

        .feather {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            background: var(--primary-light);
            border: 1px solid var(--surface-border);
            border-radius: 20px;
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .fin {
            font-size: clamp(28px, 4vw, 42px);
            line-height: 1.25;
            font-weight: 800;
            color: var(--main-text);
            margin-bottom: 20px;
            white-space: normal;
        }

        .apex {
            font-size: 16px;
            color: var(--muted-text);
            line-height: 1.75;
            margin-bottom: 28px;
        }

        .emblem {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 36px;
            min-width: 0;
        }

        .thrust {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 28px;
            background: var(--primary);
            color: #ffffff;
            font-size: 16px;
            font-weight: 600;
            text-decoration: none;
            border-radius: var(--radius);
            transition: transform var(--transition), background var(--transition);
            box-shadow: 0 4px 20px rgba(236, 96, 143, 0.35);
            min-width: 0;
        }

        .thrust:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
        }

        .propel {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 24px;
            background: var(--surface);
            color: var(--main-text);
            border: 1px solid var(--surface-border);
            font-size: 15px;
            font-weight: 500;
            text-decoration: none;
            border-radius: var(--radius);
            transition: background var(--transition), border-color var(--transition);
            min-width: 0;
        }

        .propel:hover {
            background: var(--surface-hover);
            border-color: var(--primary);
        }

        .biplane {
            display: flex;
            flex-wrap: wrap;
            flex-direction: column;
            gap: 12px;
            min-width: 0;
        }

        .trail {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 14px;
            color: var(--main-text);
            min-width: 0;
        }

        .crease {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            fill: none;
            stroke: var(--primary);
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .origami {
            flex: 1 1 400px;
            min-width: 0;
            background: var(--surface);
            border: 1px solid var(--surface-border);
            border-radius: 12px;
            padding: 32px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
            position: relative;
        }

        /* SVG Motion Demo Mockup */
        .motion-origami {
            width: 100%;
            background: rgba(11, 15, 25, 0.8);
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px;
        }

        .motion-vista {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
        }

        .dot-red { background: #ff5f56; }
        .dot-yellow { background: #ffbd2e; }
        .dot-green { background: #27c93f; }

        .dialog-box {
            background: #1a2235;
            border-radius: 8px;
            padding: 18px;
            border: 1px solid var(--primary-light);
            text-align: center;
        }

        .pulse-ring {
            width: 56px;
            height: 56px;
            margin: 0 auto 14px;
            background: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .pulse-ring svg {
            width: 28px;
            height: 28px;
            stroke: var(--primary);
        }

        /* Section 2: Steps (Article Tag) */
        .glider {
            background: var(--surface);
            border-top: 1px solid var(--surface-border);
            border-bottom: 1px solid var(--surface-border);
            padding: 64px 0;
        }

        .glider .flap {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }

        .glider .skybox {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .glider .biplane {
            flex: 1 1 280px;
            min-width: 0;
            background: rgba(11, 15, 25, 0.6);
            border: 1px solid var(--surface-border);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: transform var(--transition), border-color var(--transition);
        }

        .glider .biplane:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
        }

        .glider .crease {
            width: 44px;
            height: 44px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 18px;
        }

        .glider .fin {
            font-size: 20px;
            margin-bottom: 12px;
        }

        .glider .apex {
            font-size: 14px;
            margin-bottom: 0;
        }

        /* Section 3: FAQ (Div Tag) */
        .skybox-faq {
            padding: 32px 0;
        }

        .skybox-faq .flap {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 40px;
        }

        .skybox-faq .origami {
            display: flex;
            flex-wrap: wrap;
            flex-direction: column;
            gap: 20px;
            background: none;
            border: none;
            padding: 0;
            box-shadow: none;
        }

        .skybox-faq .biplane {
            background: var(--surface);
            border: 1px solid var(--surface-border);
            border-radius: var(--radius);
            padding: 24px 28px;
            transition: border-color var(--transition);
        }

        .skybox-faq .biplane:hover {
            border-color: var(--primary);
        }

        .skybox-faq .fin {
            font-size: 18px;
            margin-bottom: 10px;
            color: var(--main-text);
        }

        .skybox-faq .apex {
            font-size: 15px;
            margin-bottom: 0;
        }

        /* Section 4: Tips List (Aside Tag) */
        .airspace-tips {
            background: rgba(236, 96, 143, 0.05);
            border: 1px solid var(--surface-border);
            border-radius: 12px;
            padding: 48px 32px;
        }

        .airspace-tips .flap {
            margin-bottom: 36px;
        }

        .airspace-tips .origami {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            background: none;
            border: none;
            padding: 0;
            box-shadow: none;
        }

        .airspace-tips .biplane {
            flex: 1 1 300px;
            min-width: 0;
            background: var(--surface);
            border: 1px solid var(--surface-border);
            border-radius: var(--radius);
            padding: 24px;
        }

        .airspace-tips .crease {
            width: 36px;
            height: 36px;
            margin-bottom: 14px;
        }

        .airspace-tips .fin {
            font-size: 18px;
            margin-bottom: 10px;
        }

        .airspace-tips .apex {
            font-size: 14px;
            margin-bottom: 0;
        }

        /* 页脚区域 */
        .hangar {
            background: #070a11;
            border-top: 1px solid var(--surface-border);
            padding: 48px 0 32px;
            margin-top: auto;
        }

        .tarmac {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .landing {
            flex: 1 1 320px;
            min-width: 0;
        }

        .landing .fin {
            font-size: 22px;
            font-weight: 700;
            color: var(--main-text);
            margin-bottom: 12px;
        }

        .landing .apex {
            font-size: 14px;
            color: var(--muted-text);
            margin-bottom: 0;
        }

        .stamp {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            min-width: 0;
        }

        .hangar .feather {
            font-size: 13px;
            color: var(--muted-text);
            text-align: center;
            background: none;
            border: none;
            padding: 0;
            margin: 0;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .updraft {
                gap: 40px;
                padding: 24px 0 48px;
            }

            .vector {
                height: auto;
                padding: 12px 0;
                flex-direction: column;
                gap: 12px;
            }

            .azimuth {
                justify-content: center;
                width: 100%;
            }

            .rudder {
                padding: 6px 10px;
                font-size: 14px;
            }

            .thrust, .propel {
                width: 100%;
            }

            .airspace-tips {
                padding: 28px 18px;
            }
        }