:root {
  --bg: #0f1117;
  --card: #171a21;
  --card-border: #2a2e3a;
  --input-bg: #0b0d12;
  --input-border: #333845;
  --text: #e6e9ef;
  --muted: #9aa3b2;
  --accent: #4f8cff;
  --accent-hover: #3b78e8;
  --danger: #ff5c5c;
  --radius: 12px;
}

* { box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  line-height: 1.5;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.brand {
  text-align: center;
  margin-bottom: 22px;
}

.brand .logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, #2b5cff, #4f8cff);
  color: #fff;
  font-weight: 800;
  font-size: 24px;
  margin-bottom: 12px;
}

.brand h1 {
  font-size: 20px;
  margin: 0;
  font-weight: 650;
  letter-spacing: 0.2px;
}

.brand p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13.5px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13.5px;
  color: var(--muted);
  margin-bottom: 7px;
  font-weight: 500;
}

.field .input-wrap {
  position: relative;
}

.field input[type="password"],
.field input[type="text"] {
  width: 100%;
  padding: 13px 14px;
  font-size: 16px;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18);
}

.toggle-eye {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 6px;
  font-size: 16px;
}

.remember {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 4px 0 18px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.remember input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  cursor: pointer;
  flex: 0 0 auto;
}

.remember span {
  font-size: 14.5px;
  color: var(--text);
}

.btn {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}

.btn:hover { background: var(--accent-hover); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.error {
  background: rgba(255, 92, 92, 0.12);
  border: 1px solid rgba(255, 92, 92, 0.35);
  color: var(--danger);
  border-radius: var(--radius);
  padding: 11px 13px;
  font-size: 14px;
  margin-bottom: 16px;
  display: none;
}

.error.show { display: block; }

.footer {
  margin-top: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 420px) {
  body { padding: 12px; }
  .login-card { padding: 22px 18px; }
}