@import url('https://fonts.googleapis.com/css?family=Montserrat&display=swap');

:root {
  --bg: #000;
  --card-bg: #111;
  --text: #fff;
  --muted: #bbb;
  --input-bg: #1a1a1a;
  --border: #222;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Montserrat', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.login-card {
  width: 360px;
  max-width: 90%;
  padding: 24px 24px;
  border-radius: 18px;
  background: var(--card-bg);
  box-shadow: 0 18px 55px rgba(0,0,0,0.35);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center; /* مرکز عمودی */
  gap: 16px;
}

.login-card h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.login-card .lead {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 16px;
  text-align: center;
}

.login-card form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.login-card label {
  font-size: 13px;
  color: var(--muted);
  align-self: flex-start;
}

.login-card input {
  width: 100%;
  height: 48px; /* ارتفاع ثابت برای فیت بودن */
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 14px;
  box-shadow: 5px 5px 12px rgba(0,0,0,0.4), -5px -5px 12px rgba(255,255,255,0.05);
  transition: all 0.25s ease;
}

.login-card input:focus {
  outline: none;
  border-color: #3498db;
  box-shadow: 0 0 8px #3498db;
}

.btn {
  width: 100%;
  height: 48px; /* ارتفاع ثابت هم اندازه input */
  padding: 12px 16px;
  border: none;
  border-radius: 12px;
  background: var(--text);
  color: var(--bg);
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 5px 5px 12px rgba(0,0,0,0.4), -5px -5px 12px rgba(255,255,255,0.05);
  transition: all 0.25s ease;
}

.btn:hover {
  background: var(--bg);
  color: var(--text);
  box-shadow: inset 3px 3px 8px rgba(0,0,0,0.5), inset -3px -3px 8px rgba(255,255,255,0.1);
}

.help {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

.help a {
  color: #3498db;
  text-decoration: none;
  transition: 0.25s;
}

.help a:hover {
  text-decoration: underline;
}

/* Responsive */
@media(max-width:400px){
  .login-card{
    width: 90%;
    padding: 20px 16px;
  }
}