:root {
  --bg: #0b0f0e;
  --card: #141a18;
  --line: #223029;
  --green: #2fbf71;
  --green-dark: #239b5a;
  --text: #e8efe9;
  --muted: #93a89c;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(1200px 600px at 50% -10%, #13201a 0%, var(--bg) 60%);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Bengali", Roboto, sans-serif;
  color: var(--text);
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px 32px;
  box-shadow: 0 20px 60px rgba(0,0,0,.45);
}

.brand { text-align: center; margin-bottom: 28px; }

.brand-logo {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  object-fit: contain;
  background: #fff;
  padding: 6px;
  box-shadow: 0 8px 24px rgba(47,191,113,.25);
}

.brand h1 {
  margin-top: 14px;
  font-size: 26px;
  letter-spacing: .5px;
  color: var(--text);
}

.tagline {
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
}

.error {
  background: rgba(255,107,107,.1);
  border: 1px solid rgba(255,107,107,.35);
  color: var(--danger);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
  margin-bottom: 18px;
  line-height: 1.5;
}

form label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 14px 0 6px;
}

form input {
  width: 100%;
  background: #0d1210;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: border-color .15s;
}

form input:focus { border-color: var(--green); }

form button {
  width: 100%;
  margin-top: 22px;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  color: #052012;
  font-weight: 700;
  font-size: 16px;
  border: none;
  border-radius: 10px;
  padding: 13px;
  cursor: pointer;
  transition: filter .15s;
}

form button:hover { filter: brightness(1.08); }

.foot {
  margin-top: 22px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

form .remember {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}

form .remember input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--green);
  margin: 0;
  cursor: pointer;
}