:root{--color-primary:#ff6b00;--color-primary-light:#ff8c00;--color-primary-gradient:linear-gradient(135deg,#ff6b00,#ff8c00);--color-bg-light:#fff8f0;--color-bg-white:#fff;--color-bg-gradient:linear-gradient(180deg,#fff8f0,#fff);--color-text-primary:#1a1a1a;--color-text-secondary:#666;--color-text-muted:#999;--color-text-inverse:#fff;--color-border:#e5e5e5;--color-border-light:#f0f0f0;--color-success:#52c41a;--color-warning:#faad14;--color-error:#ff4d4f;--color-info:#1890ff;--shadow-sm:0 1px 2px rgba(0,0,0,.05);--shadow-md:0 4px 6px rgba(0,0,0,.07);--shadow-lg:0 10px 15px rgba(0,0,0,.1);--shadow-xl:0 20px 25px rgba(0,0,0,.15);--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--spacing-2xl:48px;--font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;--font-size-xs:12px;--font-size-sm:14px;--font-size-md:16px;--font-size-lg:18px;--font-size-xl:20px;--font-size-2xl:24px;--font-size-3xl:30px;--transition-fast:0.15s ease;--transition-normal:0.3s ease;--transition-slow:0.5s ease}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);font-size:var(--font-size-md);line-height:1.6;color:var(--color-text-primary);background:var(--color-bg-gradient);min-height:100vh}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-light)}button{cursor:pointer}button,input,textarea{font-family:inherit;border:none;outline:none}img{max-width:100%;height:auto}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--color-bg-light);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}@keyframes typing{0%{opacity:.3}50%{opacity:1}to{opacity:.3}}