:root { color: #18212a; font-family: "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; letter-spacing: 0; }
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; min-height: 100vh; display: grid; place-items: center; padding: 24px; background: #f2f5f3; }
.login-shell { width: min(420px, 100%); background: white; border: 1px solid #dce2e7; border-top: 4px solid #78be20; border-radius: 7px; box-shadow: 0 18px 48px rgba(24,33,42,.13); padding: 34px 34px 30px; }
.logo { display: block; width: min(240px, 76%); height: 66px; object-fit: contain; margin: 0 auto 24px; }
h1 { margin: 0; text-align: center; font-size: 23px; line-height: 1.35; }
.subtitle { margin: 8px 0 28px; color: #65717c; text-align: center; font-size: 12px; }
label { display: block; margin-bottom: 7px; color: #4f5d68; font-size: 12px; font-weight: 700; }
form label:not(:first-of-type) { margin-top: 14px; }
input { width: 100%; height: 44px; border: 1px solid #cbd4da; border-radius: 5px; padding: 0 12px; color: #18212a; font: inherit; outline: 0; }
input:focus { border-color: #78be20; box-shadow: 0 0 0 3px rgba(120,190,32,.18); }
button { width: 100%; height: 44px; margin-top: 16px; border: 0; border-radius: 5px; background: #78be20; color: #18212a; font: inherit; font-weight: 800; cursor: pointer; }
button:hover { background: #83c51a; }
button:disabled { opacity: .65; cursor: default; }
.error { min-height: 20px; margin: 10px 0 0; color: #b44343; text-align: center; font-size: 12px; }
.security-note { margin: 20px 0 0; padding-top: 16px; border-top: 1px solid #e9edf0; color: #8a949d; text-align: center; font-size: 10px; }