:root {
  --color-main: #3F51B5;
  --color-accent: #FFB300;
  --color-bg: #F4F6FB;
  --color-panel: #FFF;
  --color-border: #D0D7E2;
  --color-error: #D32F2F;
  --color-success: #388E3C;
  --shadow: 0 2px 8px rgba(63,81,181,0.08);
}


body {
  margin: 0;
  font-family: "Noto Sans JP", Arial, sans-serif;
  background: var(--color-bg);
  color: #333;
}


header {
  background: var(--color-main);
  color: #fff;
  padding: 1rem;
  box-shadow: var(--shadow);
  text-align: center;
}


footer {
  text-align: center;
  margin-top: 2rem;
  color: #888;
}


main {
  max-width: 600px;
  margin: 2rem auto;
  background: var(--color-panel);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem 1.5rem 1.5rem;
}


nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}


nav button {
  background: var(--color-main);
  color: #fff;
  border: none;
  border-radius: 3px;
  padding: 0.5em 1.2em;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}


nav button:hover, nav button.active {
  background: var(--color-accent);
  color: #333;
}


#auth-section {
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}


.auth-form {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  width: 100%;
  max-width: 340px;
}


.auth-form label {
  display: block;
  margin-top: 1rem;
  margin-bottom: 0.3rem;
}


.auth-form input[type="email"],
.auth-form input[type="password"],
.auth-form input[type="text"] {
  width: 100%;
  padding: 0.7em;
  font-size: 1em;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  margin-bottom: 0.8em;
  box-sizing: border-box;
}


.auth-form button {
  background: var(--color-main);
  color: #fff;
  border: none;
  border-radius: 3px;
  padding: 0.6em 1.5em;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 0.5em;
}


.oauth-buttons {
  text-align: center;
  margin-top: 1rem;
}


.oauth-buttons button {
  margin: 0.3em;
  background: #fff;
  color: var(--color-main);
  border: 1px solid var(--color-main);
  border-radius: 3px;
  padding: 0.5em 1.2em;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.2s;
}


.oauth-buttons button:hover {
  background: var(--color-main);
  color: #fff;
}


.switch-auth {
  font-size: 0.95em;
  margin-top: 1em;
}


#loading {
  position: fixed;
  top: 16px;
  right: 16px;
  background: var(--color-main);
  color: #fff;
  padding: 0.7em 1.3em;
  border-radius: 20px;
  font-size: 1.1em;
  z-index: 1000;
  box-shadow: var(--shadow);
}


#alert {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-error);
  color: #fff;
  padding: 0.8em 2em;
  border-radius: 18px;
  font-size: 1.1em;
  z-index: 1000;
  box-shadow: var(--shadow);
  display: none;
  min-width: 180px;
  text-align: center;
}


.main-panel {
  display: block;
}


input, textarea, select, button {
  font-family: inherit;
}


#home-main, #classroom-connection, #senior-messages, #hoppy {
  margin-top: 1.5em;
}


#mood-history {
  margin-top: 1em;
  background: #F6F8FF;
  border-radius: 5px;
  padding: 0.7em;
  min-height: 32px;
  font-size: 0.98em;
}


#room-list, #senior-message-list, #chat-messages {
  margin-top: 1em;
  background: #F6F8FF;
  border-radius: 5px;
  padding: 0.9em;
  min-height: 48px;
  max-height: 200px;
  overflow-y: auto;
  font-size: 0.98em;
}


#room-chat {
  margin-top: 1em;
}


#chat-messages {
  height: 160px;
  max-height: 200px;
}


#chat-form, #hoppy-form, #mood-form, #senior-message-form {
  display: flex;
  gap: 0.5em;
  margin-top: 1em;
}


#chat-input, #hoppy-input, #mood-text, #room-name {
  flex: 1;
  padding: 0.5em;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}


#senior-message-text {
  width: 100%;
  height: 64px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.5em;
  font-size: 1em;
}


#hoppy-chat-log {
  background: #F6F8FF;
  border-radius: 5px;
  padding: 0.9em;
  min-height: 48px;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 1em;
  font-size: 0.97em;
}
.hoppy-user {
  color: var(--color-main);
  font-weight: bold;
}
.hoppy-ai {
  color: var(--color-accent);
}
@media (max-width: 650px) {
  main {
    max-width: 99vw;
    margin: 0.7rem;
    padding: 1rem 0.5rem;
  }
}