/* AgentHub - Modern AI Agent Marketplace */

:root {
  --primary: #14b8a6;
  --primary-dark: #0891b2;
  --primary-light: #5eead4;
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-hover: #334155;
  --text: #f1f5f9;
  --text-muted: #cbd5e1;
  --border: #334155;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --star: #fbbf24;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Keyboard navigation focus indicators - WCAG 2.1 AA compliant */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(30, 41, 59, 0.9);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo::before {
  content: '🤖';
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(20, 184, 166, 0.3);
}

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

.btn-secondary:hover {
  background: var(--bg-hover);
}

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

.btn-ghost:hover {
  background: rgba(20, 184, 166, 0.1);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Search & Filter */
.search-section {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.search-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.search-input {
  flex: 1;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  font-size: 1rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
}

.filters {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-select {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  cursor: pointer;
}

/* Agent Cards Grid */
.agents-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.5rem;
}

.agent-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
  transition: all 0.3s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.agent-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  opacity: 0;
  transition: opacity 0.3s;
}

.agent-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  border-color: var(--primary);
}

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

.agent-card.featured {
  border-color: var(--primary);
}

.agent-card.featured::after {
  content: '⭐ Featured';
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--primary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.agent-header {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.agent-logo {
  width: 60px;
  height: 60px;
  border-radius: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  flex-shrink: 0;
}

.agent-info h3 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.agent-tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.agent-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(20, 184, 166, 0.1);
  color: var(--primary);
  border-radius: 1rem;
  font-size: 0.75rem;
  margin-bottom: 1rem;
}

.agent-description {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.agent-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.tag {
  padding: 0.25rem 0.75rem;
  background: var(--bg-hover);
  border-radius: 0.25rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.agent-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.agent-rating {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stars {
  color: var(--star);
}

.rating-count {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.agent-author {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Agent Detail Page */
.agent-detail {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.detail-header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
}

.detail-title {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.detail-logo {
  width: 100px;
  height: 100px;
  border-radius: 1rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  flex-shrink: 0;
}

.detail-info h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.detail-meta {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
}

.detail-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.content-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 1.5rem;
}

.content-section h2 {
  margin-bottom: 1rem;
  color: var(--primary);
}

.capabilities-list {
  list-style: none;
}

.capabilities-list li {
  padding: 0.75rem;
  background: var(--bg-hover);
  border-radius: 0.5rem;
  margin-bottom: 0.5rem;
}

.capabilities-list li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
  margin-right: 0.75rem;
}

/* Reviews */
.reviews-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
}

.review-form {
  padding: 1.5rem;
  background: var(--bg-hover);
  border-radius: 0.5rem;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  font-family: inherit;
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.star-rating {
  display: flex;
  gap: 0.5rem;
  font-size: 1.5rem;
}

.star-rating span {
  cursor: pointer;
  color: var(--border);
  transition: color 0.2s;
}

.star-rating span:hover,
.star-rating span.active {
  color: var(--star);
}

.review-card {
  padding: 1.5rem;
  background: var(--bg-hover);
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.review-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.review-author {
  font-weight: 600;
}

.review-date {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.review-title {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.review-comment {
  color: var(--text-muted);
  line-height: 1.6;
}

/* Submit Form */
.submit-container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
}

.form-card h1 {
  margin-bottom: 0.5rem;
}

.form-card p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* Profile Page */
.profile-container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.profile-header {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  margin-bottom: 2rem;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.profile-avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  flex-shrink: 0;
}

.profile-info h1 {
  margin-bottom: 0.5rem;
}

.profile-tier {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--primary);
  color: white;
  border-radius: 1rem;
  font-size: 0.875rem;
  margin-left: 1rem;
}

.profile-stats {
  display: flex;
  gap: 2rem;
  margin-top: 1rem;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary);
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.tab {
  padding: 1rem 2rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

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

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Pricing */
.pricing-section {
  max-width: 1000px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.pricing-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  text-align: center;
}

.pricing-card.featured {
  border-color: var(--primary);
  transform: scale(1.05);
}

.pricing-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 3rem;
  font-weight: bold;
  color: var(--primary);
  margin: 1rem 0;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin: 2rem 0;
}

.pricing-features li {
  padding: 0.5rem 0;
  color: var(--text-muted);
}

.pricing-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
  margin-right: 0.75rem;
}

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--error);
  color: var(--error);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--success);
  color: var(--success);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
}

.hidden {
  display: none;
}

/* Footer */
footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  margin-top: 4rem;
  text-align: center;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .agents-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .filters {
    flex-direction: column;
    align-items: stretch;
  }
  
  .detail-title {
    flex-direction: column;
    text-align: center;
  }
  
  .profile-header {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== DARK/LIGHT MODE TOGGLE (BUG-55) ===== */
:root {
  --toggle-bg: var(--bg-hover);
}

[data-theme="light"] {
  --bg-dark: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  --text: #0f172a;
  --text-muted: #475569;
  --border: #e2e8f0;
  --toggle-bg: #e2e8f0;
}

.theme-toggle {
  background: var(--toggle-bg);
  border: 1px solid var(--border);
  border-radius: 2rem;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
  transition: all 0.2s;
  white-space: nowrap;
}

.theme-toggle:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.theme-toggle-icon {
  font-size: 1.1rem;
}

/* ===== HAMBURGER MENU (MOBILE) ===== */
.hamburger-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

.hamburger-btn[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.hamburger-btn[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .hamburger-btn {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    flex-direction: column;
    padding: 1rem 2rem;
    border-top: 1px solid var(--border);
    gap: 1rem;
    z-index: 200;
  }

  .nav-links.nav-open {
    display: flex;
  }
}