body { font-family: "Microsoft YaHei", "PingFang SC", sans-serif; background: #f4f1ea; color: #222; margin: 0; }
main { max-width: 26rem; margin: 3rem auto; background: #fff; padding: 1.5rem 2rem; border-radius: 8px; box-shadow: 0 1px 4px rgba(0, 0, 0, .15); }
h1 { font-size: 1.5rem; margin-top: 0; }
h2 { font-size: 1.2rem; margin: 0 0 .5rem; }
label { display: block; margin-top: 1rem; font-weight: bold; }
input { width: 100%; box-sizing: border-box; padding: .5rem; font-size: 1rem; border: 1px solid #767676; border-radius: 4px; }
input:focus, button:focus, #done:focus { outline: 3px solid #1a5fb4; outline-offset: 1px; }
button { margin-top: 1.25rem; width: 100%; padding: .6rem; font-size: 1.05rem; background: #8b1a1a; color: #fff; border: 0; border-radius: 4px; cursor: pointer; }
button:disabled { background: #6b6b6b; cursor: wait; }
.hint { color: #555; font-size: .9rem; margin: .3rem 0 0; }
.warn { background: #fff4d6; border: 1px solid #9a7a10; padding: .5rem; border-radius: 4px; font-size: .9rem; }
#msg { min-height: 1.5em; margin-top: 1rem; }
#msg.err { color: #a00000; }
#done { margin-top: 1rem; padding: 1rem; background: #eef7ee; border: 1px solid #3d7a3d; border-radius: 6px; }
#uin { font-size: 1.6rem; color: #0b5d0b; letter-spacing: .05em; }
[hidden] { display: none !important; }