* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', sans-serif;
}

body {
  background-color: #eaf7ff;
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ヘッダー */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 8%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.5rem;
  font-weight: bold;
  color: #00a2ff;
}

.nav-links a {
  margin-left: 20px;
  text-decoration: none;
  color: #555;
  font-size: 0.95rem;
  font-weight: bold;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #00a2ff;
}

.main-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.screen {
  width: 100%;
  max-width: 650px;
}

.hidden {
  display: none !important;
}

/* トップ画面 */
.hero-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
  padding: 30px 40px;
  border-radius: 28px;
  box-shadow: 0 8px 25px rgba(0, 162, 255, 0.06);
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2rem;
  color: #222;
  line-height: 1.3;
  font-weight: bold;
}

.hero-sub {
  color: #00a2ff;
  font-size: 0.95rem;
  margin-top: 10px;
  font-weight: bold;
}

.mascot-sticker {
  font-size: 4.5rem;
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.action-box {
  text-align: center;
  margin-bottom: 25px;
}

.start-btn {
  background-color: #00a2ff;
  color: white;
  border: none;
  width: 100%;
  max-width: 320px;
  padding: 16px 0;
  border-radius: 30px;
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 162, 255, 0.3);
  transition: transform 0.1s, background-color 0.2s;
}

.start-btn:hover {
  background-color: #0088d6;
  transform: translateY(-2px);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.feature-card {
  background: #ffffff;
  border-radius: 20px;
  padding: 18px 8px;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-3px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 0.85rem;
  font-weight: bold;
  color: #444;
}

/* カード共通 */
.chat-card {
  background: #ffffff;
  border-radius: 28px;
  padding: 40px 30px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 162, 255, 0.08);
}

.doctor-avatar {
  font-size: 3.5rem;
  margin-bottom: 10px;
}

.sub-text {
  color: #666;
  font-size: 0.95rem;
  margin-top: 5px;
  margin-bottom: 20px;
}

.chat-message-box {
  background-color: #f2f8fc;
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 25px;
}

.chat-message-box h2 {
  font-size: 1.25rem;
  color: #222;
  margin-bottom: 6px;
}

.chat-message-box p {
  font-size: 1.1rem;
  font-weight: bold;
  color: #333;
}

.chat-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-btn {
  background-color: #00a2ff;
  color: white;
  border: none;
  padding: 16px 20px;
  border-radius: 16px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

.option-btn.secondary {
  background-color: #eef7ff;
  color: #0088d6;
  border: 2px solid #00a2ff;
}

.option-btn:hover {
  background-color: #0088d6;
  color: white;
  transform: translateY(-1px);
}

/* 診療科カードのグリッド表示 */
.dept-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 15px;
}

.dept-card {
  background: #f2f8fc;
  padding: 15px;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-weight: bold;
}

.dept-btns {
  display: flex;
  gap: 6px;
  width: 100%;
}

.dept-btns button {
  flex: 1;
  padding: 8px 0;
  border-radius: 10px;
  border: none;
  background-color: #00a2ff;
  color: white;
  font-weight: bold;
  cursor: pointer;
}

.dept-btns button.reserve-btn {
  background-color: #28a745;
}

.dept-btns button:hover {
  opacity: 0.85;
}

/* 予約フォーム */
.reserve-form {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: bold;
  color: #444;
}

.form-group input {
  padding: 12px;
  border-radius: 10px;
  border: 2px solid #e0e0e0;
  font-size: 0.95rem;
  outline: none;
}

.form-group input:focus {
  border-color: #00a2ff;
}

.custom-search-box {
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px dashed #d0e5f5;
  text-align: left;
}

.label-text {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 8px;
  font-weight: bold;
}

.input-row {
  display: flex;
  gap: 8px;
}

.input-row input {
  flex: 1;
  padding: 12px 15px;
  border-radius: 12px;
  border: 2px solid #e0e0e0;
  outline: none;
  font-size: 0.95rem;
}

.input-row input:focus {
  border-color: #00a2ff;
}

.search-submit-btn {
  background-color: #00a2ff;
  color: white;
  border: none;
  padding: 0 20px;
  border-radius: 12px;
  font-weight: bold;
  cursor: pointer;
}

.search-submit-btn:hover {
  background-color: #0088d6;
}

.input-group {
  margin-bottom: 20px;
}

textarea {
  width: 100%;
  height: 100px;
  padding: 15px;
  border-radius: 16px;
  border: 2px solid #e0e0e0;
  font-size: 1rem;
  margin-bottom: 15px;
  resize: none;
  outline: none;
}

textarea:focus {
  border-color: #00a2ff;
}

.result-box {
  background-color: #f7fbfe;
  border-left: 5px solid #00a2ff;
  padding: 20px;
  border-radius: 12px;
  text-align: left;
  margin-top: 20px;
  line-height: 1.6;
  font-size: 0.95rem;
}

/* Service・About用 */
.service-section {
  text-align: left;
  margin-bottom: 20px;
}

.service-section h3 {
  font-size: 1.1rem;
  color: #00a2ff;
  margin-bottom: 10px;
}

.language-select-box select {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  border: 2px solid #00a2ff;
  font-size: 1rem;
  font-weight: bold;
  outline: none;
  background-color: #f2f9ff;
  cursor: pointer;
}

.info-note {
  margin-top: 8px;
  font-size: 0.85rem;
  color: #00a2ff;
  font-weight: bold;
}

.divider {
  border: none;
  border-top: 1px dashed #d0e5f5;
  margin: 20px 0;
}

.usage-list {
  list-style: none;
  padding: 0;
}

.usage-list li {
  background-color: #f7fbfe;
  padding: 12px 15px;
  border-radius: 10px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  line-height: 1.5;
}

.back-link {
  background: transparent;
  border: none;
  color: #888;
  margin-top: 20px;
  cursor: pointer;
  font-size: 0.9rem;
  text-decoration: underline;
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 0.85rem;
  color: #888;
}

@media (max-width: 600px) {
  .hero-section {
    padding: 20px;
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}