:root {
  color-scheme: dark;
  --page: #10171c;
  --panel: #192126;
  --field: #141b20;
  --border: #34424b;
  --text: #f5f8f8;
  --muted: #8d9aa4;
  --accent: #42dfc7;
  --danger: #ff8179;
  font-family: "Alibaba PuHuiTi", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 16%, rgba(66, 223, 199, 0.18), transparent 26%),
    radial-gradient(circle at 84% 72%, rgba(79, 118, 255, 0.12), transparent 32%),
    linear-gradient(135deg, #10171c 0%, #121a1f 48%, #0b1216 100%);
}

button,
input {
  font: inherit;
}

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

.login-card {
  width: min(440px, 100%);
  padding: 36px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 22px;
  background: rgba(25, 33, 38, 0.94);
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.36);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  color: #07372f;
  border-radius: 16px;
  background: linear-gradient(135deg, #54ead4, #32cdb5);
  font-size: 26px;
  font-weight: 900;
}

.eyebrow {
  margin: 24px 0 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.04em;
}

.summary {
  margin: 14px 0 28px;
  color: var(--muted);
  line-height: 1.7;
}

.login-form {
  display: grid;
  gap: 16px;
}

.login-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

.login-form input {
  width: 100%;
  height: 50px;
  padding: 0 15px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  background: var(--field);
}

.login-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(66, 223, 199, 0.1);
}

.login-form button {
  height: 54px;
  margin-top: 6px;
  color: #06352f;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, #50e4cf, #3ed4bd);
  font-weight: 900;
  cursor: pointer;
}

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

.mode-toggle {
  width: 100%;
  margin-top: 16px;
  color: var(--accent);
  border: 0;
  background: transparent;
  font-weight: 800;
  cursor: pointer;
}

.login-message {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
  font-size: 14px;
}