:root {
  color-scheme: light;
  --ink: #172326;
  --muted: #607176;
  --paper: #fbfaf6;
  --line: #dbe4df;
  --teal: #1f5961;
  --teal-dark: #123d43;
  --red: #b8454b;
  --gold: #d79b2b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(251, 250, 246, 0.1), rgba(251, 250, 246, 0.3)),
    url("assets/russian-study-background-light.jpg");
  background-position: center;
  background-size: cover;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

button,
input {
  font: inherit;
}

.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-card {
  width: min(430px, 100%);
  border: 1px solid rgba(219, 228, 223, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 18px 45px rgba(23, 35, 38, 0.14);
  padding: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--gold);
  font-weight: 700;
}

h1 {
  margin: 0 0 22px;
  color: var(--teal-dark);
  font-size: 2rem;
  letter-spacing: 0;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 18px;
}

.tabs button {
  min-height: 42px;
  border: 0;
  border-right: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  cursor: pointer;
}

.tabs button:last-child {
  border-right: 0;
}

.tabs button[aria-selected="true"] {
  background: var(--teal);
  color: #fff;
}

.auth-form {
  display: grid;
  gap: 14px;
}

.auth-form.is-hidden {
  display: none;
}

label span {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.92rem;
}

input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  outline-color: rgba(31, 89, 97, 0.35);
}

.auth-form button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  background: var(--red);
  color: #fff;
  cursor: pointer;
}

.auth-form button:disabled {
  cursor: wait;
  opacity: 0.72;
}

.status {
  min-height: 1.3em;
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.5;
}