:root {
  --background-color-light: #f0f2f5;
  --text-color-light: #333;
  --container-bg-light: #fff;
  --button-bg-light: #4a90e2;
  --button-text-light: #fff;
  --menu-item-bg: #4a90e2;
  --card-bg-light: #f8f9fa;

  --background-color-dark: #2c2c2c;
  --text-color-dark: #f1f1f1;
  --container-bg-dark: #3a3a3a;
  --button-bg-dark: #5a9ee2;
  --button-text-dark: #fff;
  --card-bg-dark: #444;
}

body {
  font-family: 'Arial', sans-serif;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  margin: 0;
  padding: 40px 20px;
  background-color: var(--background-color-light);
  color: var(--text-color-light);
  transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
  background-color: var(--background-color-dark);
  color: var(--text-color-dark);
}

/* Container */
.container {
  text-align: center;
  background-color: var(--container-bg-light);
  padding: 40px;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  transition: background-color 0.3s;
  width: 100%;
  max-width: 700px;
  position: relative;
}

.page-container {
  text-align: left;
}

body.dark-mode .container {
  background-color: var(--container-bg-dark);
}

/* Dark mode toggle */
.dark-mode-toggle {
  position: absolute;
  top: 20px;
  left: 20px;
}

/* Language switcher */
.language-switcher {
  position: absolute;
  top: 20px;
  right: 20px;
}

.language-switcher a {
  color: var(--text-color-light);
  text-decoration: none;
  margin: 0 5px;
  font-size: 14px;
}

.language-switcher a.active {
  font-weight: bold;
  text-decoration: underline;
}

body.dark-mode .language-switcher a {
  color: var(--text-color-dark);
}

/* Site Navigation */
.site-nav {
  margin-top: 10px;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid #eee;
}

.site-nav a {
  color: var(--text-color-light);
  text-decoration: none;
  margin: 0 12px;
  font-weight: bold;
  font-size: 15px;
}

.site-nav a.active {
  color: var(--button-bg-light);
  border-bottom: 2px solid var(--button-bg-light);
  padding-bottom: 3px;
}

.site-nav a:hover {
  text-decoration: underline;
}

body.dark-mode .site-nav {
  border-bottom-color: #555;
}

body.dark-mode .site-nav a {
  color: var(--text-color-dark);
}

body.dark-mode .site-nav a.active {
  color: var(--button-bg-dark);
  border-bottom-color: var(--button-bg-dark);
}

/* Header */
.header {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 25px;
}

h1 {
  margin: 0 0 8px 0;
}

.subtitle {
  color: #777;
  font-size: 16px;
  margin: 0;
}

body.dark-mode .subtitle {
  color: #aaa;
}

/* Recommend section */
.recommend-section {
  margin-bottom: 10px;
}

#recommendBtn {
  background-color: var(--button-bg-light);
  color: var(--button-text-light);
  padding: 15px 30px;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
  margin-bottom: 20px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

#recommendBtn:hover {
  transform: translateY(-2px);
}

body.dark-mode #recommendBtn {
  background-color: var(--button-bg-dark);
  color: var(--button-text-dark);
}

.menu-display {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  min-height: 60px;
}

.menu-item {
  padding: 20px;
  background-color: var(--menu-item-bg);
  color: white;
  font-size: 22px;
  font-weight: bold;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  transition: transform 0.2s, background-color 0.5s;
}

.menu-image {
  width: 250px;
  height: 170px;
  margin-top: 12px;
  border-radius: 8px;
  object-fit: cover;
  display: block;
}

/* Ad container */
.ad-container {
  margin: 20px 0;
  width: 100%;
  min-height: 50px;
}

/* Tips section */
.tips-section {
  margin: 30px 0;
  text-align: left;
}

.tips-section h2 {
  text-align: center;
  margin-bottom: 20px;
}

.tips-grid {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.tip-card {
  background-color: var(--card-bg-light);
  padding: 20px;
  border-radius: 10px;
  border-left: 4px solid var(--button-bg-light);
}

.tip-card h3 {
  margin: 0 0 8px 0;
  color: var(--button-bg-light);
}

.tip-card p {
  margin: 0;
  line-height: 1.6;
}

body.dark-mode .tip-card {
  background-color: var(--card-bg-dark);
}

body.dark-mode .tip-card h3 {
  color: var(--button-bg-dark);
}

/* How-to section */
.how-section {
  margin: 30px 0;
}

.how-section h2 {
  margin-bottom: 20px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.step {
  display: flex;
  align-items: center;
  gap: 15px;
  text-align: left;
  background-color: var(--card-bg-light);
  padding: 15px 20px;
  border-radius: 10px;
}

.step-number {
  background-color: var(--button-bg-light);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 18px;
  flex-shrink: 0;
}

.step p {
  margin: 0;
  line-height: 1.5;
}

body.dark-mode .step {
  background-color: var(--card-bg-dark);
}

body.dark-mode .step-number {
  background-color: var(--button-bg-dark);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  text-align: left;
  max-width: 500px;
  margin: 30px auto 0;
  padding: 20px;
  background-color: var(--container-bg-light);
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

body.dark-mode .contact-form {
  background-color: var(--container-bg-dark);
}

.contact-form label {
  margin-bottom: 8px;
  font-weight: bold;
  color: var(--text-color-light);
}

body.dark-mode .contact-form label {
  color: var(--text-color-dark);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
  padding: 12px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
  background-color: var(--background-color-light);
  color: var(--text-color-light);
}

body.dark-mode .contact-form input[type="text"],
body.dark-mode .contact-form input[type="email"],
body.dark-mode .contact-form textarea {
  background-color: #555;
  color: var(--text-color-dark);
  border-color: #666;
}

.contact-form textarea {
  resize: vertical;
}

.contact-form button[type="submit"] {
  background-color: var(--button-bg-light);
  color: var(--button-text-light);
  padding: 12px 20px;
  border: none;
  border-radius: 5px;
  font-size: 18px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.contact-form button[type="submit"]:hover {
  background-color: #3a7bd5;
}

body.dark-mode .contact-form button[type="submit"] {
  background-color: var(--button-bg-dark);
  color: var(--button-text-dark);
}

body.dark-mode .contact-form button[type="submit"]:hover {
  background-color: #6faee5;
}

.form-desc, .section-desc {
  color: #777;
  font-size: 14px;
  margin: 0 0 15px 0;
  text-align: center;
}

body.dark-mode .form-desc,
body.dark-mode .section-desc {
  color: #aaa;
}

/* Comment section */
.comment-section {
  margin-top: 30px;
  text-align: left;
  width: 100%;
}

.comment-section h2 {
  text-align: center;
  margin-bottom: 5px;
}

#disqus_thread {
  background-color: var(--background-color-light);
  padding: 15px;
  border-radius: 10px;
}

body.dark-mode #disqus_thread {
  background-color: #444;
}

/* Footer */
.site-footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #eee;
  text-align: center;
  font-size: 14px;
  color: #999;
}

.footer-links {
  margin-top: 10px;
}

.footer-links a {
  color: #777;
  text-decoration: none;
  margin: 0 10px;
  font-size: 13px;
}

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

body.dark-mode .site-footer {
  border-top-color: #555;
  color: #888;
}

body.dark-mode .footer-links a {
  color: #aaa;
}

/* Page content (about, privacy) */
.page-content {
  margin-top: 10px;
  line-height: 1.7;
}

.page-content h1 {
  text-align: center;
  margin-bottom: 20px;
}

.page-content h2 {
  margin-top: 30px;
  margin-bottom: 10px;
  color: var(--button-bg-light);
  font-size: 20px;
}

body.dark-mode .page-content h2 {
  color: var(--button-bg-dark);
}

.page-content ul {
  padding-left: 20px;
}

.page-content li {
  margin-bottom: 8px;
}

.page-content a {
  color: var(--button-bg-light);
}

body.dark-mode .page-content a {
  color: var(--button-bg-dark);
}

.updated-date {
  text-align: center;
  color: #999;
  font-size: 14px;
}

/* Menu grid (about page) */
.menu-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 15px;
}

.menu-tag {
  background-color: var(--card-bg-light);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 15px;
  border: 1px solid #ddd;
}

body.dark-mode .menu-tag {
  background-color: var(--card-bg-dark);
  border-color: #555;
}

/* FAQ */
.faq-item {
  background-color: var(--card-bg-light);
  padding: 15px 20px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.faq-item h3 {
  margin: 0 0 8px 0;
  font-size: 16px;
  color: var(--button-bg-light);
}

.faq-item p {
  margin: 0;
}

body.dark-mode .faq-item {
  background-color: var(--card-bg-dark);
}

body.dark-mode .faq-item h3 {
  color: var(--button-bg-dark);
}

/* Dark mode toggle switch */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #4a90e2;
}

input:focus + .slider {
  box-shadow: 0 0 1px #4a90e2;
}

input:checked + .slider:before {
  transform: translateX(22px);
}

/* GEO: Intro section */
.intro-section {
  text-align: left;
  margin-bottom: 20px;
  padding: 15px 20px;
  background-color: var(--card-bg-light);
  border-radius: 10px;
  line-height: 1.7;
  font-size: 15px;
}

body.dark-mode .intro-section {
  background-color: var(--card-bg-dark);
}

.intro-section p {
  margin: 0;
}

/* GEO: Scenario section */
.scenario-section {
  margin: 30px 0;
  text-align: left;
}

.scenario-section h2 {
  text-align: center;
  margin-bottom: 20px;
}

/* GEO: FAQ section (homepage) */
.faq-section {
  margin: 30px 0;
  text-align: left;
}

.faq-section h2 {
  text-align: center;
  margin-bottom: 20px;
}

.faq-section .faq-item {
  background-color: var(--card-bg-light);
  padding: 15px 20px;
  border-radius: 10px;
  margin-bottom: 12px;
}

.faq-section .faq-item h3 {
  margin: 0 0 8px 0;
  font-size: 16px;
  color: var(--button-bg-light);
}

.faq-section .faq-item p {
  margin: 0;
  line-height: 1.6;
}

body.dark-mode .faq-section .faq-item {
  background-color: var(--card-bg-dark);
}

body.dark-mode .faq-section .faq-item h3 {
  color: var(--button-bg-dark);
}

/* GEO: Update info */
.update-info {
  text-align: center;
  margin: 20px 0;
  font-size: 14px;
  color: #777;
}

body.dark-mode .update-info {
  color: #aaa;
}