/* 主卡片 — 毛玻璃效果 */
        .feedback-card {
            position: relative;
            z-index: 10;
            max-width: 1000px;
            width: 100%;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: 60px;
            box-shadow: 0 35px 70px -20px rgba(20, 50, 80, 0.3), 0 0 0 1px rgba(255,255,255,0.5) inset;
            padding: 45px 50px;
            border: 1px solid rgba(255,255,255,0.7);
        }

        /* 细小网格纹理 (SVG) */
        .card-bg-svg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            opacity: 0.1;
            z-index: -1;
        }

        /* 标题区 */
        .header {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .header h1 {
            font-size: 1.5rem;
            font-weight: 700;
            background: linear-gradient(145deg, #194a6a, #2f6190);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
        }

        .header-icon {
            font-size: 2.2rem;
        }

        /* 简介 */
        .intro {
            font-size: .9rem;
            color: #2b557a;
            margin-bottom: 20px;
            border-left: 6px solid #4080cf;
            background: rgba(235, 247, 255, 0.6);
            border-radius: 0 40px 40px 0;
            padding: 10px 15px;
        }

        /* 新增：问题类型标签区 (四个分类) */
        .type-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 30px;
        }

        .type-tag {
            background: #f0f5fe;
            padding: 10px 28px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 500;
            color: #1e3f60;
            border: 1.5px solid transparent;
            transition: all 0.2s ease;
            box-shadow: 0 4px 8px rgba(0, 20, 40, 0.05);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            backdrop-filter: blur(2px);
        }

        .type-tag:hover {
            background: #d6e8ff;
            border-color: #2f6eb3;
            transform: scale(1.02);
            box-shadow: 0 8px 16px -8px #1d4e7c;
        }

        /* 三个指引卡片 (网格布局) */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            margin-bottom: 45px;
        }

        .guide-item {
            background: #ffffffc9;
            backdrop-filter: blur(4px);
            padding: 25px 20px;
            border-radius: 40px;
            border: 1px solid #ffffff;
            box-shadow: 0 15px 30px -15px rgba(0, 40, 70, 0.2);
            transition: transform 0.2s;
        }

        .guide-item:hover {
            transform: translateY(-5px);
        }

        .guide-icon {
            font-size: 2rem;
            margin-bottom: 15px;
        }

        .guide-item h3 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #1f4870;
            margin-bottom: 12px;
        }

        .guide-item p {
            color: #2d4e73;
            font-size: 1rem;
        }

        /* 邮箱卡片 */
        .email-section {
            background: linear-gradient(135deg, #e1f0fe, #f5fbff);
            border-radius: 20px;
            padding: 15px 50px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
            border: 2px solid #b6d6f5;
            margin-bottom: 30px;
            box-shadow: 0 10px 20px -8px #608fc0;
        }

        .email-left {
            display: flex;
            align-items: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .email-label {
            background: #1d4e7c;
            color: white;
            padding: 8px 12px;
            border-radius: 20px;
            font-weight: 500;
            font-size: 1rem;
            letter-spacing: 0.5px;
        }

        .email-address {
            font-size: 1.2rem;
            font-weight: 600;
            color: #0a3153;
            background: #ffffff;
            padding: 10px 25px;
            border-radius: 50px;
            border: 1px solid #abc1d9;
            font-family: monospace;
            word-break: break-all;
        }

        .copy-btn {
            background: #1f4e7a;
            border: none;
            color: white;
            padding: 10px 20px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: 0.15s;
            box-shadow: 0 10px 18px -8px #1d4e7c;
            border: 1px solid #ffffff50;
        }

        .copy-btn:hover {
            background: #0c3b60;
            transform: scale(1.02);
        }

        .copy-btn.copied {
            background: #1f8b4c;
        }

        /* 补充说明 */
        .footnote {
            color: #2a577b;
            font-size: 0.98rem;
            display: flex;
            align-items: center;
            gap: 10px;
            background: #ffffffaa;
            padding: 15px 25px;
            border-radius: 40px;
            border: 1px solid #c5daf2;
        }

        /* 移动端适配 */
        @media screen and (max-width: 750px) {
            .feedback-card {
                padding: 30px 25px;
                border-radius: 40px;
            }
            .header h1 {
                font-size: 2.2rem;
            }
            .guide-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }
            .email-address {
                font-size: 1.3rem;
                padding: 8px 18px;
            }
            .copy-btn {
                padding: 12px 25px;
                font-size: 1.1rem;
            }
            .email-section {
                flex-direction: column;
                align-items: flex-start;
            }
            .intro {
                font-size: 1.1rem;
            }
            .type-tag {
                padding: 10px 20px;
                font-size: 1rem;
            }
        }

        @media screen and (max-width: 450px) {
            .email-left {
                flex-direction: column;
                align-items: flex-start;
            }
            .email-address {
                font-size: 1.1rem;
                word-break: break-all;
            }
        }