:root{color-scheme:light;--paper:#fff;--surface:#f5f5f7;--ink:#1d1d1f;--muted:#626267;--line:#dedee2;--accent:#0066cc;--accent-hover:#0057ad;--error:#a52a24}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;color:var(--ink);background:var(--paper);font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;font-size:16px;line-height:1.7;-webkit-text-size-adjust:100%}a{color:inherit;text-underline-offset:5px}button{font:inherit}a,button{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--accent);outline-offset:5px}::selection{background:#d8eaff;color:var(--ink)}[hidden]{display:none!important}.skip-link{position:absolute;top:12px;left:16px;padding:10px 16px;background:var(--ink);color:var(--paper);transform:translateY(-180%);z-index:2}.skip-link:focus{transform:none}
.header{max-width:1200px;padding:24px;display:flex;align-items:center;justify-content:space-between;gap:18px;margin:auto}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;min-height:44px;font-size:23px;font-weight:600;white-space:nowrap}.brand small{display:none;font-size:11px;font-weight:500;letter-spacing:2px;margin-left:4px}.back-link{font-size:14px;text-decoration:none;min-height:44px;display:inline-flex;align-items:center;gap:7px}.back-link:hover,.original-link:hover{color:var(--accent)}
.contact-layout{max-width:1088px;margin:22px auto 0;padding:0 24px 40px}.introduction h1{font-size:42px;line-height:1.18;letter-spacing:-.025em;font-weight:600;margin:0 0 17px;text-wrap:balance}.intro-copy{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:32em}.desktop-break{display:none}.how-to{margin-top:34px}.how-to h2{font-size:17px;font-weight:500;line-height:1.5;margin:0 0 10px}.how-to p{margin:0;color:var(--muted);font-size:14px;line-height:1.8}.how-to .wechat-tip{margin-top:13px;font-size:13px}.qr-section{margin:28px auto 0;max-width:380px}.qr-figure{margin:0;background:var(--surface);border-radius:26px;padding:18px 18px 16px}.qr-viewport{position:relative;width:100%;aspect-ratio:1;overflow:hidden;background:var(--paper);user-select:auto;-webkit-touch-callout:default}.qr-viewport img{position:absolute;width:119.354839%;max-width:none;height:auto;left:-9.677419%;top:-32.258065%;user-select:auto;-webkit-touch-callout:default}.qr-figure figcaption{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:15px;font-size:15px;font-weight:500}.qr-figure figcaption svg{width:20px;height:20px}.actions{margin-top:20px;display:grid;gap:8px}.save-button{display:flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 20px;border-radius:99px;text-decoration:none;background:var(--accent);color:var(--paper);font-weight:500;transition:background-color .18s ease,transform .18s ease}.save-button svg{width:20px;height:20px}.save-button:hover{background:var(--accent-hover)}.save-button:active{transform:translateY(1px)}.save-button[aria-disabled=true]{background:#e5e5e8;color:var(--muted);cursor:not-allowed}.original-link{display:flex;align-items:center;justify-content:center;min-height:44px;font-size:14px}.save-help,.save-feedback{font-size:13px;line-height:1.8;margin:0;color:var(--muted);text-align:center}.save-feedback:not(:empty){margin:0 0 12px;color:var(--ink)}.qr-error{color:var(--error);font-size:14px;line-height:1.8;margin:14px 0}.qr-error button{display:block;margin-top:8px;border:1px solid currentColor;background:var(--paper);border-radius:10px;min-height:44px;padding:8px 14px;color:inherit}.footer{max-width:1152px;margin:0 auto;padding:24px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px}.footer p{margin:0}
@media(max-width:849px){.contact-layout{display:flex;flex-direction:column}.introduction{display:contents}.introduction h1{order:0}.intro-copy{order:1}.qr-section{order:2;width:100%}.how-to{order:3;width:100%;max-width:380px;margin:28px auto 0;padding-top:24px;border-top:1px solid var(--line)}}
@media(min-width:520px){.brand small{display:inline}.introduction h1{font-size:52px}.contact-layout{margin-top:42px}.qr-figure{padding:26px 26px 20px}}
@media(min-width:850px){.header{padding:28px 40px}.contact-layout{display:grid;grid-template-columns:minmax(0,1fr) 400px;align-items:center;gap:70px;margin:70px auto 74px;padding:0 40px;min-height:calc(100svh - 310px)}.introduction h1{font-size:64px;line-height:1.17;margin-bottom:25px}.intro-copy{font-size:18px}.desktop-break{display:block}.how-to{margin-top:58px}.how-to h2{font-size:18px}.how-to p{font-size:15px}.qr-section{margin:0;max-width:none}.qr-figure{padding:26px 26px 21px}.qr-figure figcaption{font-size:16px}.actions{grid-template-columns:1fr 104px;gap:16px;align-items:center}.original-link{font-size:14px}.footer{padding:24px 40px}.save-help{text-align:left;margin-top:14px}.save-feedback{text-align:left}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}