:root {
  --bg: #0f1420;
  --bg-soft: #161d2d;
  --card: #1a2233;
  --card-2: #202a3e;
  --line: #2a3550;
  --text: #e8edf7;
  --muted: #93a1bd;
  --accent: #4c8dff;
  --accent-2: #22c7a9;
  --danger: #ff5c6c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(1100px 620px at 18% -12%, #1c2a4a 0%, var(--bg) 58%);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.55;
}

.login-wrap { width: 100%; max-width: 420px; }

.login-card {
  background: linear-gradient(160deg, var(--card), var(--bg-soft));
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 26px 22px;
  box-shadow: 0 22px 60px rgba(0, 0, 0, .45);
}

.brand { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; }

.logo {
  width: 48px; height: 48px; flex: none;
  display: grid; place-items: center;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #08111f;
  font-weight: 800;
  font-size: 12px;
  letter-spacing: .5px;
}

.brand h1 { margin: 0; font-size: 17px; font-weight: 650; }
.brand .sub { margin: 3px 0 0; font-size: 11.5px; color: var(--muted); }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field > span { font-size: 12px; color: var(--muted); }

input {
  font: inherit;
  color: var(--text);
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 13px;
  outline: none;
  transition: border-color .15s;
}

input::placeholder { color: #64718c; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(76, 141, 255, .16); }

.btn {
  width: 100%;
  margin-top: 6px;
  font: inherit;
  font-weight: 600;
  letter-spacing: 2px;
  color: #08111f;
  cursor: pointer;
  padding: 11px 14px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  transition: filter .15s ease, transform .12s ease;
}

.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

.msg {
  margin: 14px 0 0;
  min-height: 18px;
  font-size: 12.5px;
  color: var(--muted);
  word-break: break-word;
}

.msg.ok { color: var(--accent-2); }
.msg.danger { color: #ffb3bb; }

.tip {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 11.5px;
  color: var(--muted);
}