:root {
  color-scheme: light;
  --background: #f3f7f5;
  --surface: #fff;
  --text: #17251f;
  --muted: #71817a;
  --line: #dbe5e0;
  --green: #11875d;
  --green-dark: #086c49;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--background); color: var(--text); }
.login-shell { width: min(100% - 36px, 460px); margin: 0 auto; padding: max(56px, 12vh) 0 40px; }
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 26px; }
.brand-mark { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid #9bd6b9; border-radius: 11px; background: #e2f4eb; color: var(--green); font-weight: 800; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 15px; letter-spacing: .01em; }
.brand small { margin-top: 2px; color: var(--muted); font-size: 11px; }
.login-panel { overflow: hidden; border: 1px solid var(--line); border-radius: 17px; background: var(--surface); box-shadow: 0 18px 55px rgba(31, 61, 48, .08); }
.panel-accent { height: 4px; background: var(--green); }
.panel-content { padding: 33px 34px 36px; }
h1 { margin: 0; font-size: clamp(24px, 6vw, 29px); line-height: 1.25; letter-spacing: -.035em; }
.intro { margin: 9px 0 28px; color: var(--muted); font-size: 13px; }
form { display: grid; gap: 10px; }
label { margin-top: 7px; font-size: 13px; font-weight: 650; }
input { width: 100%; height: 46px; padding: 0 13px; border: 1px solid #c9d8d1; border-radius: 10px; background: #fff; color: var(--text); font: inherit; font-size: 15px; outline: none; }
input:focus-visible { border-color: var(--green); box-shadow: 0 0 0 3px rgba(17, 135, 93, .16); }
button { height: 46px; margin-top: 14px; border: 1px solid var(--green-dark); border-radius: 10px; background: var(--green); color: #fff; font: inherit; font-weight: 700; cursor: pointer; }
button:hover { background: var(--green-dark); }
button:focus-visible { outline: 3px solid rgba(17, 135, 93, .36); outline-offset: 3px; }
.login-error { margin: 0 0 17px; padding: 10px 12px; border: 1px solid #e9bbb7; border-radius: 9px; background: #fff2f1; color: #992c29; font-size: 13px; }
.footnote { margin: 19px 0 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
@media (max-width: 520px) { .login-shell { padding-top: 42px; } .panel-content { padding: 27px 22px 30px; } }