:root {
  --bg: #0b0d12;
  --panel: #141821;
  --border: #232a38;
  --text: #e6e9f0;
  --muted: #8b93a7;
  --accent: #6366f1;
  --accent-2: #818cf8;
  --danger: #ef4444;
}

* { box-sizing: border-box; }

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

body {
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(99, 102, 241, 0.18), transparent 60%),
    radial-gradient(900px 500px at 100% 100%, rgba(34, 211, 238, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 13px;
}

.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 30px 70px -24px var(--shadow-strong, rgba(0, 0, 0, 0.9));
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.5px;
  background: linear-gradient(140deg, var(--accent), #22d3ee);
  color: #fff;
  flex: none;
}

.login-brand h1 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.login-brand p {
  margin: 3px 0 0;
  font-size: 11px;
  color: var(--muted);
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 12px;
  font-size: 11.5px;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 9px 11px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--input-bg, #191e2a);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

.login-btn {
  width: 100%;
  margin-top: 18px;
  padding: 10px 12px;
  border: 1px solid var(--accent);
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}

.login-btn:hover { background: var(--accent-hover, #5457e5); border-color: var(--accent-hover, #5457e5); }
.login-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.login-error {
  margin: 12px 0 0;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid rgba(239, 68, 68, 0.35);
  background: var(--danger-soft, rgba(239, 68, 68, 0.1));
  color: var(--danger-text, #fca5a5);
  font-size: 12px;
  line-height: 1.5;
}

.login-tip {
  margin: 16px 0 0;
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
}