/* ================================
   SysTades Social Network Styles
   ================================ */

:root {
  /* Primary Colors */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;

  /* Neutral Colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Semantic Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  /* Social Media Colors */
  --like-color: #ec4899;
  --share-color: #8b5cf6;
  --bookmark-color: #f59e0b;
  --comment-color: var(--primary-500);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);

  /* Animations */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.3s ease-out;
  --transition-slow: 0.6s ease-out;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --glass-bg: rgba(0, 0, 0, 0.1);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* ================================
   Performance Optimizations
   ================================ */

* {
  box-sizing: border-box;
}

img {
  max-width: 100%;
  height: auto;
}

/* GPU Acceleration for animations */
.accelerated {
  transform: translateZ(0);
  will-change: transform;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* ================================
   Social Feed Styles
   ================================ */

.social-feed {
  max-width: 600px;
  margin: 0 auto;
  padding: 1rem;
}

.post-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-300);
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.post-card:hover::before {
  opacity: 1;
}

/* Post Header */
.post-header {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
  gap: 0.75rem;
}

.post-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--primary-500);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.post-avatar:hover {
  transform: scale(1.1);
  border-color: var(--primary-400);
}

.post-author {
  flex: 1;
}

.post-author-name {
  font-weight: 600;
  color: var(--gray-800);
  margin: 0;
  font-size: 1rem;
}

.post-author-username {
  color: var(--gray-500);
  font-size: 0.875rem;
  margin: 0;
}

.post-time {
  color: var(--gray-400);
  font-size: 0.875rem;
}

/* Post Content */
.post-content {
  margin-bottom: 1rem;
  line-height: 1.6;
  color: var(--gray-700);
}

.post-type-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.post-type-text { background: var(--gray-100); color: var(--gray-600); }
.post-type-thought { background: var(--primary-100); color: var(--primary-600); }
.post-type-question { background: var(--warning); color: white; }
.post-type-insight { background: var(--success); color: white; }

/* Post Actions */
.post-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
}

.action-group {
  display: flex;
  gap: 1rem;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.action-btn:hover {
  background: var(--gray-100);
  color: var(--gray-700);
  transform: translateY(-1px);
}

.action-btn.active {
  color: var(--primary-600);
  background: var(--primary-50);
}

.action-btn i {
  font-size: 1rem;
}

/* Specific action colors */
.action-btn.like-btn.active {
  color: var(--like-color);
  background: rgba(236, 72, 153, 0.1);
}

.action-btn.share-btn:hover {
  color: var(--share-color);
  background: rgba(139, 92, 246, 0.1);
}

.action-btn.bookmark-btn.active {
  color: var(--bookmark-color);
  background: rgba(245, 158, 11, 0.1);
}

/* ================================
   Comments Section
   ================================ */

.comments-section {
  border-top: 1px solid var(--gray-200);
  padding-top: 1rem;
  margin-top: 1rem;
}

.comment-item {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding: 0.75rem;
  border-radius: var(--radius-lg);
  background: var(--gray-50);
  transition: background var(--transition-fast);
}

.comment-item:hover {
  background: var(--gray-100);
}

.comment-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--primary-400);
}

.comment-content {
  flex: 1;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.comment-author {
  font-weight: 600;
  color: var(--gray-800);
  font-size: 0.875rem;
}

.comment-time {
  color: var(--gray-400);
  font-size: 0.75rem;
}

.comment-text {
  color: var(--gray-700);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.comment-actions {
  display: flex;
  gap: 1rem;
}

.comment-action {
  background: none;
  border: none;
  color: var(--gray-400);
  font-size: 0.75rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.comment-action:hover {
  color: var(--primary-500);
}

/* Comment Form */
.comment-form {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.comment-form textarea {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  resize: none;
  min-height: 80px;
  transition: border-color var(--transition-fast);
}

.comment-form textarea:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.comment-submit {
  padding: 0.75rem 1.5rem;
  background: var(--primary-500);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.comment-submit:hover {
  background: var(--primary-600);
  transform: translateY(-1px);
}

/* ================================
   Create Post Form
   ================================ */

.create-post-form {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-md);
}

.create-post-textarea {
  width: 100%;
  min-height: 120px;
  padding: 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  resize: vertical;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  transition: all var(--transition-normal);
}

.create-post-textarea:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.create-post-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  gap: 1rem;
}

.post-type-select,
.post-visibility-select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  background: white;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.post-type-select:focus,
.post-visibility-select:focus {
  outline: none;
  border-color: var(--primary-500);
}

.create-post-btn {
  padding: 0.75rem 2rem;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.create-post-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.create-post-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ================================
   Filter Tabs
   ================================ */

.feed-filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  padding: 0.5rem;
  background: var(--gray-100);
  border-radius: var(--radius-xl);
  overflow-x: auto;
}

.filter-tab {
  padding: 0.75rem 1.5rem;
  border: none;
  background: transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 500;
  white-space: nowrap;
  color: var(--gray-600);
}

.filter-tab:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}

.filter-tab.active {
  background: var(--primary-500);
  color: white;
  box-shadow: var(--shadow-md);
}

/* ================================
   Notifications
   ================================ */

.notification-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.notification-item:hover {
  background: var(--gray-50);
  transform: translateX(4px);
}

.notification-item.unread {
  background: var(--primary-50);
  border-left: 4px solid var(--primary-500);
}

.notification-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
}

.notification-like { background: var(--like-color); }
.notification-comment { background: var(--comment-color); }
.notification-follow { background: var(--success); }
.notification-share { background: var(--share-color); }

.notification-content {
  flex: 1;
}

.notification-text {
  margin: 0 0 0.25rem 0;
  color: var(--gray-800);
  font-size: 0.875rem;
}

.notification-time {
  color: var(--gray-500);
  font-size: 0.75rem;
}

.notification-actions {
  display: flex;
  gap: 0.5rem;
}

.notification-delete {
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

/* ================================
   User Profile
   ================================ */

.profile-header {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  color: white;
  padding: 2rem;
  border-radius: var(--radius-2xl);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.profile-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.3;
}

.profile-info {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.profile-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-xl);
}

.profile-details h1 {
  margin: 0 0 0.5rem 0;
  font-size: 2rem;
  font-weight: 700;
}

.profile-username {
  opacity: 0.9;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.profile-bio {
  opacity: 0.8;
  line-height: 1.5;
  max-width: 500px;
}

.profile-stats {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

.follow-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.follow-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.follow-btn.following {
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary-600);
}

/* Profile Tabs */
.profile-tabs {
  display: flex;
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 2rem;
  overflow-x: auto;
}

.profile-tab {
  padding: 1rem 2rem;
  border: none;
  background: none;
  cursor: pointer;
  position: relative;
  color: var(--gray-600);
  font-weight: 500;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.profile-tab:hover {
  color: var(--primary-600);
}

.profile-tab.active {
  color: var(--primary-600);
}

.profile-tab.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-500);
  border-radius: 2px 2px 0 0;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 768px) {
  .social-feed {
    padding: 0.5rem;
  }

  .post-card {
    padding: 1rem;
    margin-bottom: 1rem;
  }

  .post-actions {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }

  .action-group {
    justify-content: space-around;
  }

  .create-post-options {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .feed-filters {
    padding: 0.25rem;
    gap: 0.25rem;
  }

  .filter-tab {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }

  .profile-header {
    padding: 1.5rem;
  }

  .profile-info {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .profile-avatar {
    width: 80px;
    height: 80px;
  }

  .profile-details h1 {
    font-size: 1.5rem;
  }

  .profile-stats {
    justify-content: center;
    gap: 1.5rem;
  }

  .profile-tabs {
    gap: 0;
  }

  .profile-tab {
    flex: 1;
    padding: 0.75rem 1rem;
    text-align: center;
    font-size: 0.875rem;
  }
}

/* ================================
   Loading & Animations
   ================================ */

.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray-300);
  border-radius: 50%;
  border-top-color: var(--primary-500);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.fade-in {
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide-up {
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ================================
   Toast Notifications
   ================================ */

.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
  margin-bottom: 0.5rem;
  box-shadow: var(--shadow-lg);
  pointer-events: all;
  max-width: 400px;
  animation: slideInRight 0.3s ease-out;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--error);
}

.toast.warning {
  border-left: 4px solid var(--warning);
}

.toast.info {
  border-left: 4px solid var(--info);
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ================================
   Utilities
   ================================ */

.text-gradient {
  background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-effect {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.shadow-glow {
  box-shadow: 0 0 20px rgba(14, 165, 233, 0.3);
}

.scrollbar-hide {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.scrollbar-hide::-webkit-scrollbar {
  display: none;
}