@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800;900&display=swap');

        :root {
            --bg-deep: #090d14;
            --bg-panel: #111827;
            --border-subtle: rgba(255, 255, 255, 0.06);
            --border-glow: rgba(139, 92, 246, 0.35);
            --text-primary: #f1f5f9;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --accent-indigo: #818cf8;
            --accent-purple: #a78bfa;
            --accent-pink: #f472b6;
            --accent-emerald: #34d399;
            --accent-amber: #fbbf24;
            --accent-rose: #fb7185;
            --accent-sky: #38bdf8;
            --accent-red: #ef4444;
            --accent-orange: #f97316;
            --glow-indigo: rgba(99, 102, 241, 0.35);
            --glow-purple: rgba(168, 85, 247, 0.3);
            --radius-xl: 1.75rem;
            --radius-2xl: 2rem;
            --radius-3xl: 2.5rem;
            --transition-smooth: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
        }

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

        body {
            font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-primary);
            overflow-x: hidden;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .hero-glow {
            position: fixed;
            width: 900px;
            height: 900px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, rgba(168, 85, 247, 0.08) 35%, rgba(9, 13, 20, 0) 70%);
            top: -280px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 0;
            pointer-events: none;
        }

        .glass-panel {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--border-subtle);
            box-shadow: 0 20px 55px rgba(0, 0, 0, 0.45);
            transition: var(--transition-smooth);
        }
        .glass-panel:hover {
            border-color: var(--border-glow);
            box-shadow: 0 32px 64px rgba(99, 102, 241, 0.22);
        }
        .glass-panel-static {
            background: rgba(17, 24, 39, 0.7);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--border-subtle);
            box-shadow: 0 20px 55px rgba(0, 0, 0, 0.45);
        }

        .gradient-text {
            background: linear-gradient(135deg, #a5b4fc 0%, #c084fc 45%, #f472b6 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .gradient-text-warm {
            background: linear-gradient(135deg, #fbbf24 0%, #f472b6 50%, #fb7185 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .gradient-text-cool {
            background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #a78bfa 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .gradient-button {
            background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
            box-shadow: 0 0 28px rgba(99, 102, 241, 0.45);
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            text-decoration: none;
            border: none;
            font-weight: 700;
            letter-spacing: 0.01em;
        }
        .gradient-button:hover {
            box-shadow: 0 0 42px rgba(168, 85, 247, 0.65);
            transform: translateY(-3px);
            background: linear-gradient(135deg, #7574f9 0%, #b366f8 100%);
        }

        /* ============ 错误代码卡片 ============ */
        .error-code-card {
            background: rgba(17, 24, 39, 0.8);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-xl);
            padding: 1.5rem 1.25rem;
            text-align: center;
            transition: var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .error-code-card:hover {
            transform: translateY(-5px);
            border-color: rgba(255, 255, 255, 0.18);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
        }
        .error-code-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--error-accent, #6366f1);
            opacity: 0.6;
        }
        .error-code-number {
            font-size: 2.2rem;
            font-weight: 900;
            letter-spacing: -0.03em;
            margin-bottom: 0.25rem;
            font-family: 'Plus Jakarta Sans', monospace;
        }

        /* ============ 排查步骤流程 ============ */
        .troubleshoot-step {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1rem 1.25rem;
            border-radius: 1.25rem;
            background: rgba(17, 24, 39, 0.5);
            border: 1px solid rgba(255, 255, 255, 0.04);
            transition: var(--transition-smooth);
        }
        .troubleshoot-step:hover {
            border-color: var(--border-glow);
            background: rgba(17, 24, 39, 0.75);
        }
        .step-indicator {
            flex-shrink: 0;
            width: 40px;
            height: 40px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1rem;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--transition-smooth);
        }
        .step-indicator.level-1 {
            background: rgba(52, 211, 153, 0.12);
            color: #34d399;
            border-color: rgba(52, 211, 153, 0.3);
        }
        .step-indicator.level-2 {
            background: rgba(251, 191, 36, 0.12);
            color: #fbbf24;
            border-color: rgba(251, 191, 36, 0.3);
        }
        .step-indicator.level-3 {
            background: rgba(249, 115, 22, 0.12);
            color: #f97316;
            border-color: rgba(249, 115, 22, 0.3);
        }
        .step-indicator.level-4 {
            background: rgba(239, 68, 68, 0.12);
            color: #ef4444;
            border-color: rgba(239, 68, 68, 0.3);
        }
        .step-indicator.level-5 {
            background: rgba(99, 102, 241, 0.15);
            color: #818cf8;
            border-color: rgba(129, 140, 248, 0.35);
        }

        /* ============ FAQ折叠面板优化 ============ */
        details.faq-item {
            border-radius: var(--radius-xl);
            padding: 1.25rem 1.5rem;
            border: 1px solid var(--border-subtle);
            transition: var(--transition-smooth);
            cursor: pointer;
        }
        details.faq-item[open] {
            border-color: var(--border-glow);
            box-shadow: 0 16px 40px rgba(99, 102, 241, 0.15);
        }
        details.faq-item summary {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            font-size: 1.05rem;
            color: #f1f5f9;
            cursor: pointer;
            list-style: none;
            gap: 1rem;
        }
        details.faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-chevron {
            flex-shrink: 0;
            transition: transform 0.35s ease;
            color: #818cf8;
            font-size: 1.2rem;
        }
        details.faq-item[open] .faq-chevron {
            transform: rotate(180deg);
        }
        .faq-answer-content {
            margin-top: 1rem;
            padding-top: 1rem;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .solution-step {
            display: flex;
            align-items: baseline;
            gap: 0.6rem;
            margin-bottom: 0.5rem;
            font-size: 0.85rem;
            color: #94a3b8;
            line-height: 1.55;
        }
        .solution-step .step-num {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: rgba(99, 102, 241, 0.2);
            color: #a5b4fc;
            font-size: 0.7rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* 脉冲动画 */
        @keyframes pulse-soft {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.5;
            }
        }
        .animate-pulse-soft {
            animation: pulse-soft 2.6s ease-in-out infinite;
        }

        /* 响应式 */
        @media (max-width: 768px) {
            .hero-glow {
                width: 500px;
                height: 500px;
                top: -160px;
            }
            .error-code-number {
                font-size: 1.7rem;
            }
            details.faq-item {
                padding: 1rem 1.25rem;
            }
            details.faq-item summary {
                font-size: 0.95rem;
            }
        }