body {
            margin: 0;
            padding: 0;
            min-height: 100vh;
            font-family: "Segoe UI", Arial, sans-serif;
            background: linear-gradient(135deg, #0f1535 60%, #1ec6e6 100%);
            color: #fff;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .container {
            width: 100%;
            max-width: 400px;
            margin: 0 auto;
            padding: 32px 16px 0 16px;
            box-sizing: border-box;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .robot-img {
            width: 160px;
            height: 160px;
            margin-bottom: 16px;
            /* 占位SVG机器人 */
            background: none;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .robot-img img {
            animation: ai-float 2.2s ease-in-out infinite alternate;
        }

        @keyframes ai-float {
            0% {
                transform: translateY(0) scale(1);
                filter: drop-shadow(0 2px 8px #ffa20044);
            }
            50% {
                transform: translateY(-12px) scale(1.04);
                filter: drop-shadow(0 8px 18px #ffa20066);
            }
            100% {
                transform: translateY(0) scale(1);
                filter: drop-shadow(0 2px 8px #ffa20044);
            }
        }

        .title {
            font-size: 2rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: #ffa200;
            text-align: left;
            width: 100%;
        }

        .subtitle {
            font-size: 1.5rem;
            font-weight: 500;
            margin-bottom: 24px;
            color: #fff;
            text-align: left;
            width: 100%;
            line-height: 1.2;
        }

        .card {
            background: rgba(20, 30, 60, 0.95);
            border-radius: 18px;
            padding: 20px 18px;
            margin-bottom: 24px;
            width: 100%;
            box-sizing: border-box;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
        }

        .result-box {
            background: linear-gradient(135deg, #18213c 60%, #1ec6e6 100%);
            border-radius: 12px;
            padding: 64px 18px; /* 高度加一倍，原32px改为64px */
            max-width: 340px;
            margin: 60px auto;
            color: #fff;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
        }

        .accuracy {
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: #fff;
        }

        .accuracy .percent {
            color: #ffa200;
            font-weight: bold;
            font-size: 1.3rem;
        }

        .desc {
            font-size: 1rem;
            color: #b8c6e0;
            margin-bottom: 6px;
        }

        .desc .highlight {
            color: #ffa200;
            font-weight: 500;
            text-decoration: underline;
            cursor: pointer;
        }

        .input-group {
            width: 100%;
            margin-bottom: 18px;
        }

        .input-group input {
            width: 100%;
            padding: 14px 12px;
            border-radius: 8px;
            border: none;
            background: #232b45;
            color: #b8c6e0;
            font-size: 1rem;
            outline: none;
            margin-bottom: 0;
            box-sizing: border-box;
        }

        .btn {
            width: 100%;
            padding: 14px 0;
            border: none;
            border-radius: 24px;
            background: linear-gradient(90deg, #1ec6e6 0%, #25a4e9 100%);
            color: #fff;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            margin-top: 8px;
            box-shadow: 0 2px 8px rgba(30, 198, 230, 0.18);
            animation: btn-breath 1.8s ease-in-out infinite;
        }

        @keyframes btn-breath {
            0% {
                box-shadow: 0 2px 16px 0 rgba(30, 198, 230, 0.25),
                0 2px 8px rgba(30, 198, 230, 0.18);
                transform: scale(1);
            }
            50% {
                box-shadow: 0 4px 32px 0 rgba(30, 198, 230, 0.38),
                0 2px 16px rgba(30, 198, 230, 0.22);
                transform: scale(1.04);
            }
            100% {
                box-shadow: 0 2px 16px 0 rgba(30, 198, 230, 0.25),
                0 2px 8px rgba(30, 198, 230, 0.18);
                transform: scale(1);
            }
        }

        #chat-btn {
            animation: breath 1.6s ease-in-out infinite;
        }

        @keyframes breath {
            0% {
                box-shadow: 0 2px 12px 0 #15a22333;
                transform: scale(1);
            }
            50% {
                box-shadow: 0 6px 24px 0 #15a22355;
                transform: scale(1.04);
            }
            100% {
                box-shadow: 0 2px 12px 0 #15a22333;
                transform: scale(1);
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 18px 4px 0 4px;
            }

            .robot-img {
                width: 120px;
                height: 120px;
            }

            .title {
                font-size:2rem;
                text-align: center;
                margin-bottom: 0;
            }

            .subtitle {
                font-size: 1.1rem;
                text-align: center;
            }
        }