/* Define theme colors and variables */
:root {
  --primary-color: #1DA1F2; /* Twitter blue */
  --primary-hover: #1A91DA; /* Darker blue for hover */
  --background-color: #FFFFFF; /* White background */
  --text-color: #0F1419; /* Dark text for contrast */
  --secondary-text: #5B7083; /* Muted gray for secondary text */
  --border-color: #E1E8ED; /* Light gray for borders */
  --shadow-color: rgba(0, 0, 0, 0.1); /* Subtle shadow */
  --accent-color: #F7F9F9; /* Very light gray for backgrounds */
  --error-color: #E0245E; /* Red for errors or delete actions */
  --success-color: #17BF63; /* Green for success states */
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --border-radius: 12px;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

/* General Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-family);
}

/* Body */
body {
  background: var(--background-color);
  color: var(--text-color);
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--background-color);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  animation: fadeIn 0.3s ease-in-out;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid var(--border-color);
  border-top: 5px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Popup (Login and Blog Creation) */
.popup {
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  animation: fadeIn 0.3s ease-in-out;
}

/* Enhanced Google Login Popup Card */
.popup-card {
  background: var(--background-color);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: 0 8px 24px var(--shadow-color);
  width: 100%;
  max-width: 400px;
  position: relative;
  animation: slideUp 0.3s ease-in-out;
  border: 1px solid var(--border-color);
}

.popup-card h2 {
  color: var(--text-color);
  font-size: 28px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-align: center;
}

.popup-card p {
  color: var(--secondary-text);
  font-size: 14px;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.google-login-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  width: 100%;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-color);
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px var(--shadow-color);
}

.google-login-btn img {
  width: 24px;
  margin-right: var(--spacing-sm);
}

.google-login-btn:hover {
  background: var(--accent-color);
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.google-login-btn:active {
  transform: translateY(0);
}

.google-login-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Blog Interface */
.container {
  max-width: 1000px;
  margin: var(--spacing-lg) auto;
  padding: 0 var(--spacing-md);
}

.container h1 {
  color: var(--text-color);
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

/* Blog Form */
.blog-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.blog-form input,
.blog-form textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  color: var(--text-color);
  background: var(--accent-color);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.blog-form input:focus,
.blog-form textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(29, 161, 242, 0.1);
}

.blog-form textarea {
  min-height: 150px;
  resize: vertical;
}

.submit-btn {
  background: var(--primary-color);
  color: var(--background-color);
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: background 0.3s, transform 0.3s;
}

.submit-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Close Button for Blog Popup */
.close-btn {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: none;
  border: none;
  font-size: 20px;
  color: var(--secondary-text);
  cursor: pointer;
  transition: color 0.3s;
}

.close-btn:hover {
  color: var(--text-color);
}

/* Blog Posts */
.blog-posts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.blog-post {
  background: var(--background-color);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: transform 0.3s, box-shadow 0.3s;
  animation: fadeInPost 0.5s ease-in-out;
}

.blog-post:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-color);
}

.blog-post h3 {
  color: var(--text-color);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* Blog Header */
.blog-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.author-img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-color);
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  color: var(--text-color);
  font-size: 15px;
  font-weight: 600;
}

.blog-meta {
  color: var(--secondary-text);
  font-size: 13px;
  font-style: italic;
}

/* Blog Content */
.blog-content {
  color: var(--text-color);
  font-size: 15px;
  line-height: 1.7;
  position: relative;
  white-space: pre-wrap; /* Preserve line breaks and spaces */
}

.blog-content.truncated {
  max-height: 11.9em;
  overflow: hidden;
  position: relative;
}

.blog-content.truncated::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--background-color));
}

/* Read More Button */
.read-more-btn {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  padding: var(--spacing-sm) 0;
  text-align: left;
  transition: color 0.3s;
}

.read-more-btn:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Blog Actions (Like/Edit/Delete) */
.blog-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  animation: slideIn 0.3s ease-in-out;
}

.like-btn, .edit-btn, .delete-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--accent-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
}

.like-btn {
  color: var(--secondary-text);
  min-width: 50px;
  justify-content: center;
}

.like-btn.liked {
  color: var(--error-color);
}

.like-btn:hover {
  background: var(--border-color);
}

.like-btn:active {
  transform: scale(1.05);
}

.like-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.like-count {
  font-size: 14px;
}

.edit-btn {
  color: var(--primary-color);
}

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

.delete-btn {
  color: var(--error-color);
}

.delete-btn:hover {
  background: var(--error-color);
  color: var(--background-color);
}

.edit-btn:disabled, .delete-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Logout Button */
.logout-btn {
  background: var(--accent-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  margin: var(--spacing-lg) auto;
  display: block;
  transition: all 0.3s ease;
}

.logout-btn:hover {
  background: var(--border-color);
  transform: translateY(-2px);
}

.logout-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Sticky + Button */
.new-blog-btn {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--primary-color);
  color: var(--background-color);
  border: none;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  cursor: pointer;
  box-shadow: 0 4px 16px var(--shadow-color);
  transition: all 0.3s ease;
  z-index: 100;
}

.new-blog-btn:hover {
  background: var(--primary-hover);
  transform: scale(1.1);
}

/* Lazy Load Spinner */
#load-more-trigger.loading::after {
  content: '';
  display: block;
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: var(--spacing-md) auto;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeInPost {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-15px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Responsive Design */
@media (max-width: 600px) {
  .popup-card {
    margin: 0 var(--spacing-md);
  }

  .container {
    margin: var(--spacing-md) auto;
    padding: 0 var(--spacing-sm);
  }

  .blog-posts {
    grid-template-columns: 1fr;
  }

  .new-blog-btn {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 52px;
    height: 52px;
    font-size: 24px;
  }
}