body {
  font-family: 'Noto Sans JP', Arial, sans-serif;
  background: #f4f4fd;
  margin: 0;
  color: #333;
}


header {
  background: #3949ab;
  color: #fff;
  padding: 0.5em 1em;
}
header h1 {
  margin: 0;
  font-size: 1.6em;
  letter-spacing: 0.05em;
}
nav#main-nav {
  margin-top: 0.5em;
}
nav#main-nav button {
  background: #fff;
  color: #3949ab;
  border: none;
  margin-right: 0.5em;
  padding: 0.4em 1.2em;
  border-radius: 20px;
  cursor: pointer;
  font-size: 1em;
  font-weight: 500;
  transition: background 0.2s;
}
nav#main-nav button:hover {
  background: #c5cae9;
}


main {
  max-width: 600px;
  margin: 2em auto 3em auto;
  background: #fff;
  border-radius: 15px;
  box-shadow: 0 2px 12px rgba(57,73,171,0.07);
  padding: 2em 1.2em;
}


section {
  margin-bottom: 2em;
}


#auth-section {
  max-width: 400px;
  margin: 3em auto;
  background: #e8eaf6;
  padding: 2em 1em;
  border-radius: 10px;
}


#auth-tabs {
  display: flex;
  margin-bottom: 1em;
}
#auth-tabs button {
  flex: 1;
  border: none;
  background: #c5cae9;
  color: #333;
  padding: 0.7em;
  cursor: pointer;
  font-size: 1em;
  border-radius: 7px 7px 0 0;
  margin-right: 2px;
}
#auth-tabs button.active {
  background: #fff;
  color: #3949ab;
  font-weight: bold;
}


form input, form textarea, form select {
  width: 96%;
  padding: 0.6em;
  margin-bottom: 0.7em;
  border: 1px solid #c5cae9;
  border-radius: 5px;
  font-size: 1em;
}


form button {
  background: #3949ab;
  color: #fff;
  border: none;
  padding: 0.5em 2em;
  border-radius: 20px;
  font-size: 1em;
  cursor: pointer;
  transition: background 0.2s;
}
form button:hover {
  background: #283593;
}


.form-error {
  color: #d32f2f;
  margin-top: 0.5em;
  min-height: 1.3em;
}


.home-entry button {
  margin: 1em 0.6em 0.5em 0;
  padding: 0.7em 1.7em;
  background: #5c6bc0;
  color: #fff;
  border: none;
  border-radius: 22px;
  font-size: 1.1em;
}
.home-entry button:hover {
  background: #3f51b5;
}


.mood-record {
  margin-top: 2em;
  display: flex;
  align-items: center;
}
.mood-record select, .mood-record button {
  margin-left: 0.7em;
}


#mood-saved {
  margin-left: 1em;
  color: #2e7d32;
}


#room-list {
  margin: 1em 0;
  border-left: 3px solid #c5cae9;
  padding-left: 1em;
}


#room-join {
  margin: 1.5em 0;
}
#room-detail {
  background: #e3eafd;
  border-radius: 10px;
  padding: 1em;
  margin-top: 1.5em;
}


#room-members {
  margin-bottom: 1em;
}


#message-list {
  max-height: 250px;
  overflow-y: auto;
  border-left: 3px solid #c5cae9;
  margin-bottom: 1em;
  padding-left: 1em;
  font-size: 1em;
}


#message-form textarea {
  min-height: 3em;
  resize: vertical;
}


#hoppy-character {
  display: flex;
  justify-content: center;
  margin-bottom: 1em;
}
#hoppy-log {
  max-height: 200px;
  overflow-y: auto;
  border-left: 3px solid #c5cae9;
  padding-left: 1em;
  margin-bottom: 1em;
  background: #f4f4fd;
  border-radius: 6px;
}
#hoppy-risk {
  margin-top: 0.7em;
  font-weight: bold;
}


footer {
  text-align: center;
  margin-top: 3em;
  padding: 1em 0 2em 0;
  color: #888;
  background: none;
}


@media (max-width: 600px) {
  main {
    max-width: 100%;
    padding: 1em 0.2em;
  }
  #auth-section {
    padding: 1.2em 0.4em;
  }
  header {
    padding: 0.5em 0.3em;
  }
}