/* =========================================
   基本設定
   ========================================= */
:root {
  --primary: #6b72c9;
  --primary-dark: #4e56ae;
  --primary-light: #eef0ff;
  --background: #f7f8fc;
  --card: #ffffff;
  --text: #2d3043;
  --muted: #6e7288;
  --border: #dfe1ee;
  --danger: #c63c56;
  --success: #27885c;
  --shadow: 0 8px 24px rgba(51, 56, 112, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Hiragino Kaku Gothic ProN",
    "Hiragino Sans",
    "Noto Sans JP",
    "Yu Gothic",
    sans-serif;
  line-height: 1.6;
}

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

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

/* =========================================
   ヘッダー・フッター
   ========================================= */
.site-header {
  background: linear-gradient(135deg, #6972c9, #8a72c9);
  color: #fff;
  padding: 18px 16px;
  box-shadow: 0 2px 10px rgba(44, 47, 89, 0.16);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.site-header h1 {
  margin: 0;
  font-size: 1.55rem;
  letter-spacing: 0.04em;
}

.tagline {
  margin: 2px 0 0;
  font-size: 0.88rem;
  opacity: 0.9;
}

.site-footer {
  padding: 24px 16px;
  color: var(--muted);
  text-align: center;
  font-size: 0.85rem;
}

/* =========================================
   レイアウト・カード
   ========================================= */
.container {
  width: min(1100px, calc(100% - 32px));
  margin: 28px auto;
}

.auth-card,
.welcome-card,
.form-card,
.safety-note,
.user-list-panel,
.conversation-panel,
.admin-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.auth-card {
  width: min(460px, 100%);
  margin: 32px auto;
  padding: 28px;
}

.auth-card h2,
.main-page h2 {
  margin-top: 0;
}

.intro-text,
.section-description {
  color: var(--muted);
}

.main-page {
  padding: 10px 0;
}

.welcome-card,
.form-card,
.safety-note {
  padding: 24px;
}

.home-menu {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.home-menu-card {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 120px;
  padding: 20px;
  text-align: left;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.15s, border-color 0.15s;
}

.home-menu-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.home-menu-card strong,
.home-menu-card small {
  display: block;
}

.home-menu-card small {
  margin-top: 4px;
  color: var(--muted);
}

.menu-icon {
  font-size: 2rem;
}

/* =========================================
   フォーム
   ========================================= */
label {
  display: block;
  margin: 16px 0 6px;
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  padding: 11px 12px;
  color: var(--text);
  background: #fff;
  border: 1px solid #cdd0df;
  border-radius: 10px;
}

textarea {
  resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
  outline: 3px solid rgba(107, 114, 201, 0.2);
  border-color: var(--primary);
}

.primary-btn,
.secondary-btn,
.oauth-btn,
.nav-btn {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
}

.primary-btn {
  width: 100%;
  margin-top: 18px;
  color: #fff;
  background: var(--primary);
  font-weight: 700;
}

.primary-btn:hover {
  background: var(--primary-dark);
}

.secondary-btn {
  color: #fff;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.oauth-btn {
  width: 100%;
  margin-top: 10px;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
}

.text-btn {
  padding: 0;
  color: var(--primary-dark);
  background: transparent;
  border: 0;
  text-decoration: underline;
}

.switch-text {
  margin-top: 20px;
  text-align: center;
}

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.divider::before,
.divider::after {
  flex: 1;
  height: 1px;
  background: var(--border);
  content: "";
}

.form-message {
  min-height: 1.5em;
  margin: 10px 0 0;
  font-size: 0.9rem;
}

.error-message {
  color: var(--danger);
}

.success-message {
  color: var(--success);
}

/* =========================================
   ナビゲーション
   ========================================= */
.main-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin-bottom: 24px;
  padding-bottom: 4px;
}

.nav-btn {
  flex: 0 0 auto;
  color: var(--muted);
  background: #e9eaf3;
}

.nav-btn.active {
  color: #fff;
  background: var(--primary);
}

/* =========================================
   チャット
   ========================================= */
.chat-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 18px;
}

.user-list-panel,
.conversation-panel {
  padding: 18px;
}

.user-list-panel h3 {
  margin-top: 0;
}

.user-list {
  display: grid;
  gap: 8px;
}

.user-list-item {
  width: 100%;
  padding: 12px;
  text-align: left;
  color: var(--text);
  background: #f8f8fc;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.user-list-item:hover,
.user-list-item.active {
  background: var(--primary-light);
  border-color: var(--primary);
}

.user-list-item strong,
.user-list-item small {
  display: block;
}

.user-list-item small {
  color: var(--muted);
}

.chat-room-header {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.chat-room-header h3,
.chat-room-header p {
  margin: 0;
}

.chat-room-header p {
  color: var(--muted);
  font-size: 0.9rem;
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: 440px;
  overflow-y: auto;
  padding: 18px 0;
}

.message-bubble {
  max-width: 78%;
  padding: 10px 13px;
  border-radius: 14px;
  background: #eceef8;
  word-break: break-word;
}

.message-bubble.mine {
  align-self: flex-end;
  color: #fff;
  background: var(--primary);
}

.message-meta {
  display: block;
  margin-bottom: 3px;
  font-size: 0.75rem;
  opacity: 0.8;
}

.message-form {
  display: grid;
  grid-template-columns: 1fr 100px;
  gap: 10px;
  align-items: end;
}

.message-form .primary-btn {
  margin: 0;
}

.empty-state {
  padding: 48px 16px;
  color: var(--muted);
  text-align: center;
}

/* =========================================
   プロフィール
   ========================================= */
.search-row {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.search-row .primary-btn {
  width: auto;
  margin: 0;
  white-space: nowrap;
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.profile-card {
  padding: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.profile-card h3 {
  margin: 0;
}

.profile-card .profile-meta {
  margin: 4px 0 12px;
  color: var(--muted);
  font-size: 0.9rem;
}

.profile-card p {
  white-space: pre-wrap;
  word-break: break-word;
}

.profile-card .chat-start-btn {
  width: 100%;
  margin-top: 8px;
  padding: 9px;
  color: #fff;
  background: var(--primary);
  border: 0;
  border-radius: 8px;
}

/* =========================================
   管理画面
   ========================================= */
.admin-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.admin-card {
  padding: 18px;
}

.admin-card h3 {
  margin-top: 0;
}

.admin-row {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  word-break: break-word;
}

.admin-row:last-child {
  border-bottom: 0;
}

/* =========================================
   スマートフォン対応
   ========================================= */
@media (max-width: 800px) {
  .home-menu,
  .profile-grid,
  .admin-grid {
    grid-template-columns: 1fr;
  }

  .chat-layout {
    grid-template-columns: 1fr;
  }

  .message-list {
    height: 330px;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(100% - 20px, 1100px);
    margin: 16px auto;
  }

  .header-inner {
    align-items: flex-start;
  }

  .site-header h1 {
    font-size: 1.3rem;
  }

  .auth-card,
  .welcome-card,
  .form-card,
  .safety-note,
  .user-list-panel,
  .conversation-panel {
    padding: 16px;
    border-radius: 12px;
  }

  .message-form {
    grid-template-columns: 1fr;
  }

  .search-row {
    flex-direction: column;
  }

  .search-row .primary-btn {
    width: 100%;
  }
}