* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            background: #f5f7fa;
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
            padding: 20px;
        }
        .container {
            max-width: 600px;
            margin: 0 auto;
            background: white;
            border-radius: 28px;
            box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        /* 顶部背景改为紫蓝渐变，圆角由容器裁剪，手机端保持圆角 */
        header {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            color: white;
            padding: 24px 20px;
            text-align: center;
            position: relative;
            /* 确保顶部圆角，但容器overflow:hidden会裁剪，所以无需额外设置 */
        }
        header h1 {
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        header p {
            opacity: 0.9;
            font-size: 0.95rem;
        }
        .main-content {
            padding: 24px;
        }
        .upload-section {
            margin-bottom: 20px;
        }
        /* 上传区域美化 */
        .upload-area {
            background: #f2f8ff;
            border: 2px dashed #b6d6fc;
            border-radius: 28px;
            padding: 32px 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.25s ease;
            box-shadow: 0 2px 12px rgba(58, 130, 240, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.7);
            position: relative;
        }
        .upload-area::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 28px;
            background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.5) 0%, transparent 70%);
            pointer-events: none;
        }
        .upload-area:hover {
            background: #eaf3ff;
            border-color: #8bb9fa;
            box-shadow: 0 4px 20px rgba(58, 130, 240, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.8);
            transform: translateY(-1px);
        }
        .upload-area:active {
            transform: scale(0.98);
        }
        .upload-icon {
            font-size: 48px;
            color: #3b82f6;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .upload-text p {
            color: #1e3a6b;
            font-weight: 500;
            position: relative;
            z-index: 1;
        }
        .upload-button {
            background: #3b82f6;
            color: white;
            border: none;
            padding: 10px 24px;
            border-radius: 40px;
            font-size: 0.9rem;
            margin-top: 16px;
            cursor: pointer;
            position: relative;
            z-index: 1;
            transition: background 0.15s;
        }
        .upload-button:hover {
            background: #2563eb;
        }
        .file-counter {
            text-align: right;
            font-size: 0.9rem;
            color: #475569;
            margin: 12px 0;
        }
        .counter {
            font-weight: bold;
            color: #1e293b;
            font-size: 1.2rem;
        }
        .progress-container {
            background: #e2e8f0;
            border-radius: 12px;
            height: 8px;
            margin: 20px 0;
            overflow: hidden;
        }
        .progress-bar {
            background: #3b82f6;
            width: 0%;
            height: 100%;
            transition: width 0.3s ease;
        }
        .submit-section {
            margin: 24px 0;
        }
        .submit-button {
            background: #10b981;
            color: white;
            border: none;
            width: 100%;
            padding: 14px;
            border-radius: 60px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: 0.1s;
        }
        .submit-button:disabled {
            background: #9ca3af;
            cursor: not-allowed;
            opacity: 0.6;
        }
        .info-section {
            background: #f1f5f9;
            border-radius: 20px;
            padding: 16px;
            margin-top: 24px;
        }
        .info-title {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }
        .info-title h3 {
            font-size: 1rem;
            color: #0f172a;
        }
        .info-content p {
            font-size: 0.85rem;
            color: #334155;
            margin: 6px 0;
        }
        footer {
            text-align: center;
            padding: 16px;
            border-top: 1px solid #e2e8f0;
            font-size: 0.75rem;
            color: #64748b;
        }

        /* ===== 自定义模态框（弹窗）样式 ===== */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(6px);
            display: none;  /* 默认隐藏 */
            align-items: center;
            justify-content: center;
            z-index: 9999;
            padding: 20px;
        }
        .modal-overlay.active {
            display: flex;
        }
        .modal-card {
            background: white;
            max-width: 360px;
            width: 100%;
            border-radius: 32px;
            padding: 32px 24px 24px;
            text-align: center;
            box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
            animation: modalFadeIn 0.3s ease;
        }
        @keyframes modalFadeIn {
            from { opacity: 0; transform: scale(0.9); }
            to { opacity: 1; transform: scale(1); }
        }
        .modal-icon {
            font-size: 56px;
            margin-bottom: 12px;
        }
        .modal-title {
            font-size: 1.4rem;
            font-weight: 600;
            color: #0f172a;
            margin-bottom: 8px;
        }
        .modal-desc {
            font-size: 0.95rem;
            color: #475569;
            margin-bottom: 24px;
            line-height: 1.5;
        }
        .modal-btn {
            background: linear-gradient(135deg, #10b981, #059669);
            color: white;
            border: none;
            padding: 12px 32px;
            border-radius: 60px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: 0.15s;
            width: 100%;
        }
        .modal-btn:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 20px rgba(16, 185, 129, 0.35);
        }
        .modal-btn:active {
            transform: scale(0.97);
        }

        /* 手机端保持圆角，不移除容器圆角 */
        @media (max-width: 520px) {
            .container {
                margin: 0;
                /* 保留圆角，不设为0 */
                border-radius: 28px;
            }
            header h1 {
                font-size: 1.4rem;
            }
            .upload-area {
                padding: 24px 16px;
                border-radius: 24px;
            }
            .modal-card {
                max-width: 320px;
                padding: 28px 20px 20px;
            }
        }
    
/* Local integration additions */
:root{--fission-primary:#e54d42;--fission-blue:#1a6dcc}.preview-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:0 0 14px}.preview-strip img{width:100%;aspect-ratio:1;border-radius:9px;object-fit:cover;box-shadow:0 3px 10px rgba(0,0,0,.1)}header{background:linear-gradient(135deg,#6820df,var(--fission-blue))}.upload-button,.modal-btn{background:linear-gradient(135deg,var(--fission-blue),#4d7cff)}.modal-overlay.show{display:flex}button{font:inherit;cursor:pointer}
:root{--fission-primary:#e54d42;--fission-blue:#1a6dcc}.preview-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:0 0 14px}.preview-strip img{width:100%;aspect-ratio:1;border-radius:9px;object-fit:cover;box-shadow:0 3px 10px rgba(0,0,0,.1)}header{background:linear-gradient(135deg,#6820df,var(--fission-blue))}.upload-button,.modal-btn{background:linear-gradient(135deg,var(--fission-blue),#4d7cff)}.modal-overlay.show{display:flex}button{font:inherit;cursor:pointer}.modal-card{position:relative}.modal-close-visible{display:grid!important;place-items:center;position:absolute;top:10px;right:10px;width:36px;height:36px;border:0;border-radius:50%;background:#f1f3f7;color:#252531;font:700 26px/1 Arial,sans-serif;z-index:5;visibility:visible!important;opacity:1!important}