/* --- Color Variables --- */
:root {
  --bg-color: #f4f7f6;
  --font-family: 'Segoe UI', 'Meiryo', sans-serif;
  --text-color: #333;
  --card-bg-color: #fff;
  --header-bg-color: #fff;
  --header-text-color: #555;
  --footer-bg-color: #87CEEB;
  --footer-text-color: #fff;
  --primary-color: #007bff;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --loader-bg: #fff;
  --loader-ring: #f3f3f3;
  --loader-spinner: #3498db;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --card-bg-color: #1e1e1e;
  --header-bg-color: #1e1e1e;
  --header-text-color: #e0e0e0;
  --primary-color: #3498db;
  --border-color: #333;
  --shadow-color: rgba(0, 0, 0, 0.2);
  --loader-bg: #121212;
}
.blog-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  vertical-align: middle;
  object-fit: cover;
}
body {
  font-family: var(--font-family);
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}
header, footer {
  background: #38a1db;
  color: #fff;
  padding: 1em 0;
  text-align: center;
}
header nav a {
  color: #fff;
  margin: 0 1em;
  text-decoration: none;
  font-weight: bold;
}
header nav a:hover {
  text-decoration: underline;
}
main {
  max-width: 800px;
  margin: 2em auto;
  background-color: var(--card-bg-color);
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 2px 8px var(--shadow-color);
}
#profile-img {
  width: 160px;
  border-radius: 50%;
  margin-bottom: 1em;
}
#profile-video {
  display: block;
  margin: 1em auto;
}
#blog-form {
  margin-bottom: 2em;
}
#blog-form input, #blog-form textarea {
  width: 100%;
  margin-bottom: 1em;
  padding: 0.5em;
  border-radius: 4px;
  border: 1px solid #b3e0ff;
}
#blog-form button {
  background: #38a1db;
  color: #fff;
  border: none;
  padding: 0.7em 2em;
  border-radius: 4px;
  cursor: pointer;
}
#blog-list {
  margin-top: 2em;
}
footer .footer-links a {
  color: #fff;
  margin: 0 0.5em;
  text-decoration: underline;
}
footer form {
  margin: 1em 0;
}
/* 基本的なスタイルリセット */
body, h1, h2, h3, p, ul, li, a, form, input, button, textarea, select {
  margin: 0;
  padding: 0;
  box-sizing: border-box; 
  font-family: var(--font-family);
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

/* ヘッダー */
header {
  background-color: var(--header-bg-color);
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 2px 4px var(--shadow-color);
}

nav a {
  color: var(--header-text-color);
  text-decoration: none;
  margin-right: 1.5rem;
  font-weight: bold;
  transition: color 0.3s ease;
}

nav a:hover {
  color: var(--primary-color);
}

/* メインコンテンツ */
main {
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

section {
  background-color: var(--card-bg-color);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px var(--shadow-color);
  margin-bottom: 2rem;
}

section h1, section h2 {
  margin-bottom: 1.5rem;
  color: var(--text-color);
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
}

/* ブログ作成ツール */
#blog-tool-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: bold;
  color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="date"],
.form-group input[type="url"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s, box-shadow 0.3s;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 25%, transparent);
}

#mode-selector {
  margin-bottom: 1rem;
}

/* 生成ボタン */
#generate-json-btn {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 4px;
  background-color: #28a745;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.3s ease;
  align-self: flex-start;
}

#generate-json-btn:hover {
  background-color: #218838;
}

/* JSON出力エリア */
#json-output-container {
  margin-top: 2rem;
}

#json-output {
  width: 100%;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1rem;
  font-family: monospace;
}

#copy-json-btn {
  margin-top: 0.5rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 4px;
  background-color: var(--primary-color);
  color: white;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#copy-json-btn:hover {
  background-color: #0056b3;
}

/* フッター */
footer {
  text-align: center;
  padding: 2rem;
  background-color: var(--footer-bg-color);
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}

#message-form {
  margin-bottom: 1rem;
}

#message-form input, #message-form button {
  padding: 0.8rem;
  margin: 0.3rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

#message-form button {
  background-color: var(--primary-color);
  color: white;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#message-form button:hover {
  background-color: color-mix(in srgb, var(--primary-color) 85%, black);
}

.footer-links a {
  color: var(--footer-text-color);
  text-decoration: none;
  margin: 0 0.5rem;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* ブログ記事 */
.blog-post {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  display: flex;
  align-items: flex-start;
}

.blog-post:last-child {
  border-bottom: none;
}

.blog-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  margin-right: 1.5rem;
  object-fit: cover;
}

.blog-post-content h3 {
  margin-bottom: 0.5rem;
}

.blog-post-content small {
  color: color-mix(in srgb, var(--text-color) 60%, transparent);
  margin-bottom: 0.5rem;
  display: block;
}

/* 個別記事ページ */
#post-container h1 {
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
}

.post-body {
  margin-top: 2rem;
  line-height: 1.8;
}
/* Xタイムライン */
#x-timeline {
  margin-top: 2rem;
}

#message-form button {
  background: #38a1db;
  color: #fff;
  border: none;
  cursor: pointer;
}

/* ローディング画面 */
#loader-bg {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: var(--loader-bg);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader {
  border: 8px solid var(--loader-ring);
  border-top: 8px solid var(--loader-spinner);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  animation: spin 1.5s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* --- Theme Toggle Switch --- */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-switch {
  display: inline-block;
  height: 24px;
  position: relative;
  width: 48px;
}

.theme-switch input {
  display:none;
}

.slider {
  background-color: #ccc;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
  border-radius: 24px;
}

.slider:before {
  background-color: #fff;
  bottom: 4px;
  content: "";
  height: 16px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 16px;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(24px);
}