:root { --ink:#172028; --muted:#62707d; --line:#dce4e9; --page:#f5f8fa; --accent:#276b9a; }
* { box-sizing:border-box; }
body { margin:0; color:var(--ink); background:var(--page); font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif; }
.lock-screen { min-height:100svh; display:grid; place-items:center; padding:24px; }
.lock-card { width:min(100%,390px); padding:40px; border:1px solid var(--line); border-radius:20px; background:#fff; box-shadow:0 16px 50px rgb(31 55 74 / 10%); }
.eyebrow { margin:0 0 14px; color:var(--accent); font-size:12px; font-weight:700; letter-spacing:.14em; }
h1 { margin:0; font-size:26px; letter-spacing:-.03em; }
.lock-card > p:not(.eyebrow) { margin:12px 0 28px; color:var(--muted); line-height:1.6; }
form { display:grid; gap:10px; }
label { font-size:14px; font-weight:700; }
input { width:100%; height:46px; padding:0 12px; border:1px solid #bdc9d1; border-radius:10px; font:inherit; outline:none; }
input:focus { border-color:var(--accent); box-shadow:0 0 0 3px rgb(39 107 154 / 15%); }
button { height:46px; margin-top:8px; border:0; border-radius:10px; background:var(--accent); color:#fff; cursor:pointer; font:inherit; font-weight:700; }
button:disabled { cursor:wait; opacity:.7; }
.error { margin:2px 0 0; color:#b42318; font-size:14px; }
.viewer { min-height:100svh; display:grid; justify-items:center; align-content:start; padding:24px; background:#e9eff3; }
.update-note { margin:0 0 18px; color:#244e72; font-family:"STKaiti","KaiTi","FZKai-Z03",cursive; font-size:clamp(24px,5vw,40px); font-weight:700; letter-spacing:.08em; text-shadow:1px 2px 0 #fff,2px 3px 8px rgb(39 107 154 / 18%); }
.shared-image { display:block; width:min(100%,900px); height:auto; background:#fff; box-shadow:0 10px 35px rgb(31 55 74 / 14%); }