:root {
  --ink: #111513;
  --muted: #5d6762;
  --line: #dce2dd;
  --surface: #fff;
  --soft: #f2f5f2;
  --accent: #108f82;
  --danger: #b33b32;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: #eef1ee;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
}
.login-shell {
  width: min(920px, 100%);
  min-height: 520px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 24px 70px rgba(17, 21, 19, .12);
}
.login-intro {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 56px;
  background: var(--ink);
  color: #fff;
}
.brand-row { display: flex; align-items: center; gap: 12px; font-size: 18px; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 7px; background: #fff; }
.brand-mark i { width: 14px; height: 19px; border-radius: 2px; background: linear-gradient(90deg, #111 0 43%, transparent 43% 58%, #f15b3d 58% 100%); }
.login-intro h1 { margin: 74px 0 16px; max-width: 9em; font-size: 42px; line-height: 1.12; letter-spacing: 0; }
.login-intro p { max-width: 38em; margin: 0; color: rgba(255,255,255,.68); line-height: 1.8; }
.auth-panel { align-self: center; padding: 42px; }
.tabs { display: grid; grid-template-columns: 1fr 1fr; margin-bottom: 30px; border-bottom: 1px solid var(--line); }
.tabs button { border: 0; border-bottom: 2px solid transparent; background: transparent; padding: 12px; color: var(--muted); font: inherit; font-weight: 700; cursor: pointer; }
.tabs button.active { border-color: var(--ink); color: var(--ink); }
form { display: grid; gap: 18px; }
label { display: grid; gap: 7px; color: var(--muted); font-size: 13px; font-weight: 650; }
input { width: 100%; height: 44px; border: 1px solid var(--line); border-radius: 6px; padding: 0 12px; background: #fff; color: var(--ink); font: inherit; outline: none; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(16,143,130,.1); }
.primary { height: 46px; border: 0; border-radius: 6px; background: var(--ink); color: #fff; font: inherit; font-weight: 750; cursor: pointer; }
.primary:disabled { opacity: .55; cursor: wait; }
.message { min-height: 21px; margin: 16px 0 0; color: var(--danger); font-size: 13px; }
.legal { margin: 12px 0 0; color: #8a928e; font-size: 12px; line-height: 1.6; }
.legal a { color: var(--ink); }
@media (max-width: 720px) {
  body { padding: 0; background: #fff; }
  .login-shell { min-height: 100vh; grid-template-columns: 1fr; border: 0; border-radius: 0; box-shadow: none; }
  .login-intro { padding: 30px 24px; justify-content: flex-start; }
  .login-intro h1 { margin: 34px 0 10px; max-width: none; font-size: 30px; }
  .auth-panel { width: 100%; padding: 30px 24px 42px; }
}