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

        body {
            background: #f5f7fb;
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 32px 24px;
            line-height: 1.4;
        }

        /* 主卡片 - 更宽松的呼吸感 */
        .card {
            background: #ffffff;
            border-radius: 40px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.04), 0 6px 12px rgba(0, 0, 0, 0.02);
            width: 100%;
            max-width: 1100px;
            padding: 48px 52px;
            transition: all 0.2s;
            border: 1px solid #eef2f8;
        }

        /* 头部区域 */
        h2 {
            font-size: 28px;
            font-weight: 600;
            color: #1a2c3e;
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }

        .subhead {
            color: #5c6f87;
            font-size: 15px;
            margin-bottom: 48px;
            padding-left: 14px;
            border-left: 3px solid #94a3b8;
            font-weight: 450;
        }

        /* 步骤指示器 - 更宽松 */
        .step-indicator {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            margin-bottom: 58px;
            position: relative;
            padding: 0 12px;
        }

        .step-indicator::before {
            content: '';
            position: absolute;
            top: 28px;
            left: 80px;
            right: 80px;
            height: 2px;
            background: #e6edf4;
            border-radius: 2px;
            z-index: 1;
        }

        .step {
            position: relative;
            z-index: 2;
            background: transparent;
            text-align: center;
            flex: 1;
        }

        .step-number {
            width: 56px;
            height: 56px;
            background: #ffffff;
            border: 1.5px solid #dfe7ef;
            border-radius: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-weight: 600;
            font-size: 22px;
            color: #8ba0b5;
            transition: all 0.2s;
            box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
        }

        .step.active .step-number {
            background: #ffffff;
            border-color: #3b82f6;
            color: #3b82f6;
            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.12);
        }

        .step.completed .step-number {
            background: #f1f5f9;
            border-color: #cbd5e1;
            color: #475569;
        }

        .step-label {
            font-size: 14px;
            font-weight: 500;
            color: #65748c;
            letter-spacing: 0.2px;
        }

        .step.active .step-label {
            color: #1e293b;
            font-weight: 600;
        }

        /* 步骤内容区域 */
        .step-content {
            display: none;
            animation: fadeInUp 0.35s ease;
        }

        .step-content.active {
            display: block;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 输入框区域 - 白色+柔和灰 */
        .input-wrapper {
            background: #ffffff;
            border-radius: 32px;
            padding: 36px 40px;
            border: 1px solid #edf2f7;
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
        }

        .field {
            margin-bottom: 32px;
        }

        .field label {
            display: block;
            font-size: 15px;
            font-weight: 500;
            color: #2c3f4f;
            margin-bottom: 12px;
        }

        .field input {
            width: 100%;
            padding: 16px 22px;
            border: 1px solid #e2e8f0;
            border-radius: 28px;
            font-size: 16px;
            background: #ffffff;
            transition: all 0.2s;
            font-family: inherit;
            color: #1f2a3e;
        }

        .field input:focus {
            outline: none;
            border-color: #94a3b8;
            box-shadow: 0 0 0 3px rgba(148, 163, 184, 0.1);
        }

        /* 按钮通用 - 柔和灰色为主 */
        .button {
            background: #f1f4f9;
            color: #2c3f4f;
            border: 1px solid #e2e8f0;
            padding: 16px 28px;
            font-size: 16px;
            font-weight: 500;
            border-radius: 48px;
            cursor: pointer;
            transition: all 0.2s;
            width: 100%;
            text-align: center;
            letter-spacing: 0.2px;
            box-shadow: 0 1px 1px rgba(0, 0, 0, 0.02);
        }

        .button:hover {
            background: #e9edf3;
            border-color: #cbd5e1;
            transform: translateY(-1px);
        }

        .button.primary {
            background: #1e293b;
            color: white;
            border: none;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        }

        .button.primary:hover {
            background: #0f172a;
        }

        .button.secondary {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            color: #4b5a6e;
            box-shadow: none;
            margin-top: 16px;
        }

        .button.secondary:hover {
            background: #f8fafc;
            border-color: #cbd5e1;
        }

        /* 订单列表区域 - 更舒心 */
        .orders-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin: 28px 0 36px;
            max-height: 560px;
            overflow-y: auto;
            padding-right: 8px;
        }

        .order-item {
            background: #ffffff;
            border: 1px solid #edf2f8;
            border-radius: 32px;
            padding: 28px 32px;
            cursor: pointer;
            transition: all 0.2s;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
        }

        .order-item:hover {
            border-color: #cbd5e1;
            background: #fefefe;
            transform: translateY(-2px);
            box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.08);
        }

        .order-item.selected {
            border-color: #94a3b8;
            background: #fbfdff;
            box-shadow: 0 0 0 3px rgba(100, 116, 139, 0.08);
        }

        .order-item-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .order-number {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-weight: 500;
            color: #1f2e3e;
            background: #f8fafc;
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 14px;
            border: 1px solid #e9edf2;
            letter-spacing: 0.2px;
        }

        .order-amount {
            font-weight: 600;
            color: #2c6e4f;
            background: #eef6f1;
            padding: 8px 22px;
            border-radius: 40px;
            font-size: 15px;
            border: 1px solid #ddebe3;
        }

        .order-time {
            color: #5e6f86;
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 18px;
        }

        .email-hint {
            margin-top: 18px;
            padding-top: 18px;
            border-top: 1px solid #eef2f8;
            font-size: 14px;
            color: #4b5a6e;
            display: flex;
            align-items: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        .email-preview {
            background: #f8fafc;
            padding: 6px 20px;
            border-radius: 40px;
            font-family: monospace;
            font-size: 14px;
            color: #1f2e3e;
            border: 1px solid #e9edf2;
        }

        /* 验证框 白色+浅灰 */
        .verify-box {
            background: #ffffff;
            border-radius: 32px;
            padding: 32px 34px;
            margin: 24px 0 24px;
            border: 1px solid #edf2f8;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
        }

        .selected-order-info {
            background: #fafcff;
            border-radius: 28px;
            padding: 22px 28px;
            margin-bottom: 28px;
            border-left: 4px solid #8ba0b5;
            border: 1px solid #eef2f8;
        }

        /* 卡密展示区 */
        .cards-result {
            background: #ffffff;
            border-radius: 32px;
            padding: 32px 36px;
            margin-top: 12px;
            border: 1px solid #edf2f8;
        }

        .cards-header {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            margin-bottom: 32px;
            flex-wrap: wrap;
            gap: 16px;
        }

        .cards-header h3 {
            font-size: 22px;
            font-weight: 600;
            color: #1e2a3a;
        }

        .card-item {
            background: #fefefe;
            border-radius: 28px;
            padding: 28px 32px;
            margin-bottom: 24px;
            border: 1px solid #eef2f8;
            transition: all 0.2s;
        }

        .card-item:hover {
            border-color: #dce5ef;
            background: #ffffff;
        }

        .card-key {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 20px;
            background: #f1f5f9;
            color: #1e293b;
            padding: 18px 26px;
            border-radius: 28px;
            word-break: break-all;
            font-weight: 540;
            letter-spacing: 0.3px;
            margin-bottom: 22px;
            border: 1px solid #e2e8f0;
        }

        .card-description {
            background: #fafcff;
            padding: 20px 24px;
            border-radius: 24px;
            color: #2c3f4f;
            line-height: 1.6;
            font-size: 15px;
            border: 1px solid #eef2f8;
        }

        .card-meta {
            margin-top: 20px;
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            padding-top: 18px;
            border-top: 1px solid #eef2f8;
        }

        .card-meta span {
            background: #f8fafc;
            padding: 6px 20px;
            border-radius: 40px;
            font-size: 13px;
            color: #4b5b70;
        }

        .back-button {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            padding: 14px 26px;
            border-radius: 48px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 500;
            color: #4b5a6e;
            transition: all 0.2s;
            width: 100%;
            margin-top: 28px;
        }

        .back-button:hover {
            background: #f8fafc;
            border-color: #cbd5e1;
        }

        .error-message {
            background: #fff7f5;
            color: #b91c1c;
            padding: 16px 24px;
            border-radius: 28px;
            border: 1px solid #ffe2db;
            margin: 24px 0;
            font-size: 14px;
        }

        /* 滚动条优化 */
        .orders-list::-webkit-scrollbar {
            width: 6px;
        }

        .orders-list::-webkit-scrollbar-track {
            background: #f1f5f9;
            border-radius: 12px;
        }

        .orders-list::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 12px;
        }

        footer {
            text-align: center;
            margin-top: 48px;
            color: #94a3b8;
            font-size: 13px;
            padding-top: 8px;
        }

        .loading-spinner {
            display: inline-block;
            width: 18px;
            height: 18px;
            border: 2px solid #cbd5e1;
            border-radius: 50%;
            border-top-color: #2c3f4f;
            animation: spin 0.8s linear infinite;
            margin-right: 8px;
            vertical-align: middle;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        /* 响应式 */
        @media (max-width: 720px) {
            .card {
                padding: 28px 22px;
            }

            .input-wrapper,
            .verify-box,
            .cards-result {
                padding: 24px 20px;
            }

            .order-item {
                padding: 20px 22px;
            }

            .card-key {
                font-size: 18px;
                padding: 14px 18px;
            }

            h2 {
                font-size: 24px;
            }

            .step-number {
                width: 44px;
                height: 44px;
                font-size: 18px;
            }

            .step-indicator::before {
                top: 22px;
                left: 50px;
                right: 50px;
            }
        }