:root {
  color-scheme: light;
  --ink: #152338;
  --body: #526178;
  --muted: #7c899b;
  --line: #dce4ed;
  --navy: #1e3a5f;
  --navy-dark: #142d4d;
  --canvas: #eef3f8;
  --white: #ffffff;
  --red: #b63d3a;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body { min-height: 100%; margin: 0; }

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

button, input { font: inherit; }

.auth-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
  width: min(1040px, calc(100% - 48px));
  min-height: 630px;
  margin: max(5vh, 36px) auto;
  overflow: hidden;
  border: 1px solid rgba(30, 58, 95, 0.1);
  border-radius: 22px;
  background: var(--white);
  box-shadow: 0 30px 70px rgba(22, 42, 67, 0.13);
}

.auth-intro {
  position: relative;
  padding: 70px 64px;
  overflow: hidden;
  background: linear-gradient(145deg, #1d395d, #102844);
  color: #fff;
}

.auth-intro::after {
  position: absolute;
  right: -130px;
  bottom: -170px;
  width: 390px;
  height: 390px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  box-shadow: 0 0 0 55px rgba(255,255,255,.035), 0 0 0 110px rgba(255,255,255,.025);
  content: "";
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 54px;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 13px;
  background: rgba(255,255,255,.1);
  font-size: 22px;
  font-weight: 760;
}

.eyebrow {
  margin: 0 0 12px;
  color: inherit;
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .16em;
}

.auth-intro .eyebrow { color: #9eb6d2; }

.auth-intro h1 {
  margin: 0;
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.2;
  letter-spacing: -.035em;
}

.intro-copy {
  max-width: 430px;
  margin: 30px 0 28px;
  color: #bed0e3;
  font-size: 15px;
  line-height: 1.8;
}

.auth-intro ul {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  color: #dbe7f2;
  font-size: 13px;
  list-style: none;
}

.auth-intro li::before { margin-right: 10px; color: #86b5e6; content: "✓"; }

.auth-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 64px 72px;
}

.auth-card-head .eyebrow { color: #59718f; }
.auth-card h2 { margin: 0; font-size: 27px; letter-spacing: -.02em; }
.auth-card-head > p:last-child { margin: 9px 0 0; color: var(--muted); font-size: 13px; }

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  margin: 34px 0 28px;
  padding: 4px;
  border-radius: 10px;
  background: #f1f4f8;
}

.auth-tab {
  min-height: 38px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--body);
  cursor: pointer;
  font-weight: 700;
}

.auth-tab.active { background: #fff; color: var(--navy); box-shadow: 0 1px 4px rgba(15,35,60,.1); }

#authForm { display: grid; gap: 18px; }
#authForm label { display: grid; gap: 8px; }
#authForm label span { color: var(--body); font-size: 12px; font-weight: 700; }
#authForm input {
  width: 100%;
  min-height: 46px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  color: var(--ink);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

#authForm input:focus { border-color: #6483a7; box-shadow: 0 0 0 3px rgba(65,102,143,.1); }

.submit-btn {
  min-height: 46px;
  margin-top: 5px;
  border: 1px solid var(--navy);
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  cursor: pointer;
  font-weight: 760;
}

.submit-btn:hover { background: var(--navy-dark); }
.submit-btn:disabled { cursor: wait; opacity: .66; }
.auth-error { padding: 10px 12px; border-radius: 7px; background: #fff0ef; color: var(--red); font-size: 12px; }
.auth-error.success { background: #eaf7f0; color: #18794e; }
.text-btn {
  justify-self: end;
  margin: -8px 0 -4px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #44698f;
  cursor: pointer;
  font-size: 12px;
}
.text-btn:hover { color: var(--navy); text-decoration: underline; }
.auth-help {
  margin-top: -6px;
  padding: 11px 12px;
  border: 1px solid #dce7f1;
  border-radius: 8px;
  background: #f5f8fb;
  color: var(--body);
  font-size: 12px;
  line-height: 1.65;
}
.security-note { margin: 24px 0 0; color: #929dac; font-size: 11px; line-height: 1.6; }

@media (max-width: 760px) {
  .auth-shell { display: block; width: min(100% - 24px, 480px); min-height: 0; margin: 12px auto; }
  .auth-intro { padding: 30px 28px; }
  .brand-mark { margin-bottom: 24px; }
  .auth-intro h1 { font-size: 31px; }
  .intro-copy { margin: 18px 0 0; }
  .auth-intro ul { display: none; }
  .auth-card { padding: 38px 28px 34px; }
}