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

body {
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e9fd 100%);
  min-height: 100vh;
  color: #333;
}

.header {
  background: #000;
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: white;
}

.brand img {
  height: 48px;
  margin-right: 12px;
}

.brand-name {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.8px;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 120px);
  padding: 2rem 1rem;
}

.form-container {
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 460px;
  overflow: hidden;
}

.otp-box {
  width: 54px;
  height: 64px;
  font-size: 1.8rem;
  font-weight: bold;
  text-align: center;
  border: 2px solid #d1d5db;
  border-radius: 10px;
  transition: all 0.2s;
  caret-color: transparent;

}

.otp-box:focus {
  border-color: #000;
  box-shadow: 0 0 0 4px rgba(0,0,0,0.08);
  outline: none;
}

.input-group-text.toggle-password {
  cursor: pointer;
  background: #fff;
}

.input-group-text.toggle-password:hover {
  background: #f3f4f6;
}


.footer {
  background: #f8f9fa;
  text-align: center;
  padding: 1.2rem;
  margin-top: auto;
  border-top: 1px solid #e5e7eb;
}

.copyright {
  color: #6b7280;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 576px) {
  .otp-box {
    width: 46px;
    height: 56px;
    font-size: 1.5rem;
  }
}