:root{--primary-color:#1890ff;--primary-gradient:linear-gradient(135deg,#1890ff,#096dd9);--primary-light:#e6f7ff;--primary-hover:#40a9ff;--success-color:#52c41a;--success-bg:#f6ffed;--success-border:rgba(82,196,26,.2);--error-color:#ff4d4f;--error-bg:#fff1f0;--error-border:rgba(255,77,79,.2);--text-primary:#1a1a1a;--text-secondary:#666;--text-light:#888;--text-white:#fff;--bg-primary:#f0f5ff;--bg-secondary:#e6f7ff;--bg-white:#fff;--shadow-sm:0 2px 8px rgba(0,0,0,.08);--shadow-md:0 8px 24px rgba(0,0,0,.12);--shadow-lg:0 12px 40px rgba(0,0,0,.16);--radius-sm:8px;--radius-md:16px;--radius-lg:20px;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--font-size-sm:14px;--font-size-md:16px;--font-size-lg:20px;--font-size-xl:24px;--font-size-xxl:28px}body{margin:0;padding:0;font-family:var(--font-family);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.page-container{min-height:100vh;padding:var(--spacing-xl) var(--spacing-lg);position:relative;overflow-x:hidden;background:#f5f5f5}.page-container:before{content:"";position:absolute;top:0;left:0;right:0;height:200px;background:var(--primary-gradient);clip-path:polygon(0 0,100% 0,100% 85%,0 100%);z-index:0}.invoice-sub-page{min-height:100vh;background:#f5f7fa}.invoice-sub-page .page-header{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:center;height:48px;padding:0 16px;background:var(--primary-gradient);box-shadow:0 2px 8px rgba(9,109,217,.25)}.invoice-sub-page .page-header 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auto}.card{background:hsla(0,0%,100%,.95);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:var(--spacing-xl);margin-bottom:var(--spacing-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid hsla(0,0%,100%,.2);transform:translateY(0);transition:all .3s ease}.btn{display:inline-block;border:none;cursor:pointer;transition:all .2s;outline:none}.btn,.btn-primary{font-size:var(--font-size-md)}.btn-primary{width:100%;height:48px;background:var(--primary-color);color:#fff;border-radius:12px;font-weight:600}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-primary:not(:disabled):active{opacity:.85}.btn-link{color:var(--primary-color);text-decoration:none;font-size:13px;padding:2px 4px;border-radius:4px;cursor:pointer;transition:all .2s}.btn-link:hover{background:rgba(24,144,255,.08)}.form-input{width:100%;height:44px;padding:0 12px;border:1.5px solid #e0e0e0;border-radius:8px;font-size:15px;box-sizing:border-box;outline:none;transition:border-color .2s;background:#fff}.form-input:focus{border-color:var(--primary-color)}.toast-message{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,.75);color:#fff;padding:12px 24px;border-radius:8px;font-size:14px;z-index:9999;opacity:0;transition:opacity .3s}.toast-message.show{opacity:1}@media (max-width:768px){.page-container{padding:var(--spacing-lg) var(--spacing-md)}.page-title{font-size:var(--font-size-xl);margin-bottom:var(--spacing-lg)}.card{padding:var(--spacing-lg)}}@media (max-width:480px){.page-container{padding:var(--spacing-md) var(--spacing-sm)}.page-title{font-size:var(--font-size-lg)}.card{padding:var(--spacing-md)}}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body,html{margin:0;padding:0;font-family:PingFang SC,Microsoft 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