/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", sans-serif;
}

/* Background */
body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #eef2f7;
}

/* Card */
.card {
  width: 380px;
  padding: 35px 30px;
  border-radius: 14px;
  background: #ffffff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
  text-align: center;
  position: relative;
}

/* Top Accent Bar */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 6px;
  width: 100%;
  background: #3b82f6;
  border-radius: 14px 14px 0 0;
}

/* Heading */
.card h2 {
  margin-bottom: 8px;
  font-weight: 600;
  color: #1f2937;
}

/* Sub heading */
.card h2::after {
  content: "Lecture Scheduler Portal";
  display: block;
  font-size: 13px;
  font-weight: 400;
  color: #6b7280;
  margin-top: 5px;
}

/* Inputs */
input {
  width: 100%;
  padding: 12px;
  margin-top: 14px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  font-size: 14px;
  background: #f9fafb;
  transition: 0.2s;
}

/* Input focus */
input:focus {
  border-color: #3b82f6;
  background: #fff;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

/* Buttons */
button {
  width: 100%;
  padding: 12px;
  margin-top: 15px;
  border: none;
  border-radius: 8px;
  background: #3b82f6;
  color: #fff;
  font-weight: 500;
  cursor: pointer;
  transition: 0.2s;
}

/* Hover */
button:hover {
  background: #2563eb;
}

/* OTP Box */
#otpBox {
  display: none;
  margin-top: 15px;
}

/* Messages */
.msg {
  color: #16a34a;
  font-size: 13px;
  margin-top: 10px;
}

.err {
  color: #dc2626;
  font-size: 13px;
  margin-top: 10px;
}

/* Footer note */
.card::after {
  content: "Secure login for teachers & administrators";
  display: block;
  font-size: 12px;
  color: #9ca3af;
  margin-top: 20px;
}

/* Responsive */
@media (max-width: 420px) {
  .card {
    width: 90%;
    padding: 25px;
  }
}