/* Import standard fonts if not loaded via PHP */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Manrope:wght@600;700;800&display=swap');

/* Main Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-sidebar { grid-template-columns: 1fr 300px; }

@media (max-width: 1024px) {
  .grid-sidebar { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.flex { display: flex; align-items: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { display: flex; flex-wrap: wrap; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Premium Card Layout */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: rgba(79, 70, 229, 0.3);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

/* Beautiful Gradients */
.gradient-bg {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(124, 58, 237, 0.05) 100%);
  position: relative;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-button {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #FFFFFF !important;
  border: none;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px 0 rgba(79, 70, 229, 0.4);
}

.gradient-button:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, var(--secondary-hover) 100%);
  box-shadow: 0 6px 20px 0 rgba(79, 70, 229, 0.6);
  transform: translateY(-1px);
}

/* Typography styles */
.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 0.75rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 3rem auto;
  text-align: center;
}

/* Sticky Header Customization */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--border);
  height: 70px;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

.logo-link {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background-color: rgba(79, 70, 229, 0.05);
}

/* Dynamic Live Search Bar */
.search-container {
  position: relative;
  width: 100%;
  max-width: 320px;
}

.search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.5rem;
  background-color: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  background-color: var(--card-bg);
}

.search-icon-svg {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  pointer-events: none;
  width: 16px;
  height: 16px;
}

.search-results-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 150;
  max-height: 400px;
  overflow-y: auto;
  display: none;
}

.search-results-section {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.search-results-section:last-child {
  border-bottom: none;
}

.search-results-header {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-light);
  padding: 0.25rem 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  color: var(--text-main);
  transition: var(--transition-fast);
}

.search-result-item:hover {
  background-color: rgba(79, 70, 229, 0.05);
  color: var(--primary);
}

/* User Action Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.925rem;
  font-weight: 600;
  transition: var(--transition-fast);
  cursor: pointer;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
}

.btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
  border: 1px solid var(--primary);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background-color: var(--background);
  border-color: var(--text-muted);
}

.btn-text {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 0.5rem;
}

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

/* Sticky Mobile Bottom Navigation */
.mobile-nav-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background-color: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--border);
  z-index: 100;
  justify-content: space-around;
  align-items: center;
  padding: 0 1rem;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-muted);
  gap: 2px;
}

.mobile-nav-item svg {
  width: 20px;
  height: 20px;
}

.mobile-nav-item.active, .mobile-nav-item:hover {
  color: var(--primary);
}

.mobile-ask-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white !important;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.4);
  transform: translateY(-10px);
}

@media (max-width: 768px) {
  .mobile-nav-bar { display: flex; }
  .site-header { top: 0; }
  body { padding-bottom: 60px; }
}

/* Hero Section */
.hero-section {
  padding: 6rem 0 4rem 0;
  overflow: hidden;
  position: relative;
}

.hero-heading {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.hero-heading span {
  display: block;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 550px;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.hero-illustration {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 400px;
}

/* Floating Activity Cards Animation */
.floating-card {
  position: absolute;
  animation: float 6s ease-in-out infinite;
  box-shadow: var(--shadow-xl);
  max-width: 240px;
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.float-1 { top: 10%; left: 10%; animation-delay: 0s; }
.float-2 { bottom: 15%; right: 10%; animation-delay: 2s; }
.float-3 { top: 40%; right: 5%; animation-delay: 4s; }

@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(1deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

/* Stats Section */
.stats-section {
  padding: 3rem 0;
  border-y: 1px solid var(--border);
  margin-bottom: 4rem;
}

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

.stat-number {
  font-family: var(--font-headings);
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Question Listing Cards */
.question-card {
  display: flex;
  gap: 1.5rem;
  padding: 1.75rem;
}

.question-stats-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 70px;
  gap: 0.75rem;
}

.question-stat-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 65px;
  height: 60px;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.question-stat-box span {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 2px;
}

.question-stat-box.answers-box {
  border: 1px solid var(--border);
}

.question-stat-box.answers-box.has-answers {
  background-color: rgba(79, 70, 229, 0.08);
  border-color: rgba(79, 70, 229, 0.2);
  color: var(--primary);
}

.question-stat-box.answers-box.has-answers span {
  color: var(--primary);
}

.question-stat-box.answers-box.solved {
  background-color: var(--success);
  border-color: var(--success);
  color: #FFFFFF;
}

.question-stat-box.answers-box.solved span {
  color: #FFFFFF;
}

.question-content-col {
  flex-grow: 1;
}

.question-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.question-card-title a {
  color: var(--text-main);
}

.question-card-title a:hover {
  color: var(--primary);
}

.question-excerpt {
  font-size: 0.925rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tag-badge {
  background-color: var(--background);
  color: var(--text-muted);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--border);
  transition: var(--transition-fast);
}

.tag-badge:hover {
  background-color: rgba(79, 70, 229, 0.05);
  color: var(--primary);
  border-color: rgba(79, 70, 229, 0.2);
}

.category-badge {
  color: var(--secondary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  display: inline-block;
}

.question-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  font-size: 0.825rem;
  color: var(--text-light);
}

.author-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-weight: 500;
}

.author-chip img {
  border-radius: var(--radius-full);
  width: 24px;
  height: 24px;
}

@media (max-width: 576px) {
  .question-card {
    flex-direction: column;
    gap: 1rem;
  }
  .question-stats-col {
    flex-direction: row;
    justify-content: flex-start;
    gap: 0.5rem;
  }
}

/* Category Cards Grid */
.category-card {
  padding: 2rem;
  text-align: center;
}

.category-card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: rgba(79, 70, 229, 0.08);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem auto;
  font-size: 1.5rem;
  transition: var(--transition);
}

.category-card:hover .category-card-icon {
  background-color: var(--primary);
  color: #FFFFFF;
  transform: scale(1.1);
}

.category-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.category-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.category-card-count {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
}

/* Top Contributors */
.contributor-card {
  padding: 1.5rem;
  text-align: center;
}

.contributor-avatar-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: 1rem;
}

.contributor-avatar {
  border-radius: var(--radius-full);
  border: 3px solid var(--border);
  width: 80px;
  height: 80px;
  transition: var(--transition);
}

.contributor-card:hover .contributor-avatar {
  border-color: var(--primary);
}

.badge-reputation {
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--secondary);
  color: white;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 700;
  border: 2px solid var(--card-bg);
}

.contributor-name {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.contributor-stats {
  display: flex;
  justify-content: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.contributor-badge-list {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-bottom: 1rem;
  min-height: 18px;
}

.badge-item {
  font-size: 0.65rem;
  padding: 0.1rem 0.4rem;
  border-radius: var(--radius-sm);
  background-color: rgba(6, 182, 212, 0.1);
  color: var(--accent);
  font-weight: 600;
}

/* AJAX Tabs Filter Styling */
.filter-tabs-wrapper {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  overflow-x: auto;
}

.filter-tab {
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-fast);
}

.filter-tab:hover, .filter-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Single Question View Specifics */
.question-detail-layout {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 1.5rem;
}

.vote-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.vote-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.vote-btn:hover {
  background-color: rgba(79, 70, 229, 0.05);
  color: var(--primary);
  border-color: var(--primary);
}

.vote-btn.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

.vote-count {
  font-family: var(--font-headings);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
}

.question-body {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-main);
}

.question-body pre {
  background-color: var(--background);
  border: 1px solid var(--border);
  padding: 1rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
}

.question-body code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9rem;
}

/* Answer list and specific items */
.answer-list-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 3rem 0 1.5rem 0;
}

.answer-item {
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
}

.answer-item:last-child {
  border-bottom: none;
}

.correct-answer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background-color: var(--success);
  color: white;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* User Profile Header */
.profile-cover {
  height: 200px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-lg);
  margin-bottom: -50px;
}

.profile-info-bar {
  display: flex;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.profile-avatar-large {
  border-radius: var(--radius-full);
  border: 4px solid var(--card-bg);
  width: 110px;
  height: 110px;
  box-shadow: var(--shadow-lg);
  background-color: var(--card-bg);
}

.profile-names-wrapper {
  flex-grow: 1;
  padding-bottom: 0.5rem;
}

.profile-display-name {
  font-size: 1.75rem;
  font-weight: 800;
}

.profile-username {
  color: var(--text-light);
  font-size: 0.95rem;
}

.profile-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

/* Auth Cards */
.auth-container {
  max-width: 440px;
  margin: 4rem auto;
}

.social-login-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.social-login-btn {
  border: 1px solid var(--border);
  background: var(--card-bg);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.social-login-btn:hover {
  background-color: var(--background);
}

.auth-separator {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-light);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.auth-separator::before, .auth-separator::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border);
}

.auth-separator:not(:empty)::before {
  margin-right: .5em;
}

.auth-separator:not(:empty)::after {
  margin-left: .5em;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--background);
  color: var(--text-main);
  transition: var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--card-bg);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Micro animations / Interactive Effects */
.btn-pulse {
  position: relative;
}

.btn-pulse::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: inherit;
  border: 2px solid var(--primary);
  opacity: 0;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.5; }
  100% { transform: scale(1.15); opacity: 0; }
}

/* Custom Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--background);
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}