/* ===== CSS Variables ===== */
:root {
  --primary-start: #6366f1;
  --primary-mid: #8b5cf6;
  --primary-end: #a855f7;
  --accent-start: #22d3ee;
  --accent-end: #06b6d4;
  --bg-dark: #0f0f1a;
  --bg-darker: #0a0a12;
  --bg-card: #1a1a2e;
  --bg-card-hover: #252542;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #6b6b80;
  --border-color: rgba(139, 92, 246, 0.2);
  --glow-primary: rgba(139, 92, 246, 0.4);
  --glow-accent: rgba(34, 211, 238, 0.4);
  --gradient-primary: linear-gradient(135deg, var(--primary-start), var(--primary-mid), var(--primary-end));
  --gradient-accent: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  --gradient-mixed: linear-gradient(135deg, var(--primary-start), var(--accent-start));
  --sidebar-width: 280px;
  --navbar-height: 70px;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--navbar-height) + 20px);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
  color: var(--text-secondary);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.accent-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: rgba(15, 15, 26, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.sidebar-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background: var(--bg-card);
  border-color: var(--primary-mid);
}

.sidebar-toggle svg {
  width: 20px;
  height: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.brand-icon {
  width: 40px;
  height: 40px;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--navbar-height));
  background: var(--bg-darker);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 1.5rem 0;
  transform: translateX(0);
  transition: transform var(--transition-medium);
  z-index: 900;
}

.sidebar.collapsed {
  transform: translateX(-100%);
}

.sidebar-section {
  margin-bottom: 1.5rem;
}

.sidebar-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0 1.5rem;
  margin-bottom: 0.75rem;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
}

.sidebar-nav a:hover {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.1);
}

.sidebar-nav a.active {
  color: var(--accent-start);
  background: rgba(34, 211, 238, 0.1);
  border-left-color: var(--accent-start);
}

.sidebar-nav a svg {
  width: 18px;
  height: 18px;
  opacity: 0.7;
}

/* ===== Main Content ===== */
.main-content {
  margin-left: var(--sidebar-width);
  padding-top: var(--navbar-height);
  min-height: 100vh;
  transition: margin-left var(--transition-medium);
}

.main-content.expanded {
  margin-left: 0;
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: calc(100vh - var(--navbar-height));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(139, 92, 246, 0.3), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(34, 211, 238, 0.2), transparent),
    radial-gradient(ellipse 60% 40% at 20% 100%, rgba(168, 85, 247, 0.2), transparent);
  z-index: -1;
}

.hero-content {
  max-width: 900px;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-mid);
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
}

.hero h1 {
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 3rem;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-tagline strong {
  color: var(--accent-start);
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 20px var(--glow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px var(--glow-primary);
}

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

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--primary-mid);
}

.btn svg {
  width: 18px;
  height: 18px;
}

/* Floating nodes animation */
.hero-visual {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.floating-node {
  position: absolute;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  opacity: 0.15;
  animation: float 20s infinite ease-in-out;
}

.floating-node:nth-child(1) {
  background: var(--gradient-primary);
  top: 15%;
  left: 10%;
  animation-delay: 0s;
}

.floating-node:nth-child(2) {
  background: var(--gradient-accent);
  top: 60%;
  right: 15%;
  animation-delay: -5s;
  width: 80px;
  height: 80px;
}

.floating-node:nth-child(3) {
  background: var(--gradient-mixed);
  bottom: 20%;
  left: 20%;
  animation-delay: -10s;
  width: 50px;
  height: 50px;
}

.floating-node:nth-child(4) {
  background: var(--gradient-primary);
  top: 30%;
  right: 10%;
  animation-delay: -15s;
  width: 40px;
  height: 40px;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(20px, -30px) rotate(90deg); }
  50% { transform: translate(-10px, 20px) rotate(180deg); }
  75% { transform: translate(30px, 10px) rotate(270deg); }
}

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

/* ===== Sections ===== */
.section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 4rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.1rem;
}

/* ===== Get Started Section ===== */
.install-box {
  max-width: 900px;
  margin: 0 auto;
}

.install-commands {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.install-commands .code-box {
  margin-bottom: 0;
}

.install-commands .code-box-header {
  padding: 0.75rem 1rem;
}

.install-commands .code-box-lang {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.install-commands .code-box pre {
  height: auto;
  overflow: visible;
}

.install-commands .code-box code {
  white-space: pre-wrap;
  word-wrap: break-word;
  word-break: break-word;
  overflow-wrap: break-word;
}

@media (max-width: 768px) {
  .install-commands {
    grid-template-columns: 1fr;
  }
}

.install-pre {
  height: auto !important;
  padding: 1rem 1.25rem !important;
}

.install-pre code {
  font-size: 0.9rem;
  line-height: 1.6;
}

.quick-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.quick-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.quick-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-mid);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.quick-link svg {
  width: 24px;
  height: 24px;
  opacity: 0.8;
}

.quick-link:hover svg {
  opacity: 1;
}

/* ===== Core API Tabs ===== */
.tabs-container {
  background: var(--bg-card);
  border-radius: 16px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  max-width: 100%;
}

.tabs-header {
  display: flex;
  background: var(--bg-darker);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  flex: 1 1 auto;
  min-width: fit-content;
  padding: 1rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
  text-align: center;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.1);
}

.tab-btn.active {
  color: var(--accent-start);
  background: rgba(34, 211, 238, 0.1);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
}

.tab-content {
  display: none;
  padding: 2rem;
  animation: fadeIn 0.3s ease;
  max-width: 100%;
  overflow-x: auto;
}

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

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

.tab-info {
  margin-bottom: 2rem;
}

.tab-info h3 {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-info h3 code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  background: rgba(139, 92, 246, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  font-size: 1rem;
}

.problem-statement {
  background: rgba(168, 85, 247, 0.1);
  border-left: 3px solid var(--primary-end);
  padding: 1rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin-bottom: 1.5rem;
}

.problem-statement h4 {
  color: var(--primary-end);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== Code Box ===== */
.code-box {
  position: relative;
  background: var(--bg-darker);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  max-width: 100%;
}

.code-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--border-color);
}

.code-box-dots {
  display: flex;
  gap: 6px;
}

.code-box-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-box-dots span:nth-child(1) { background: #ff5f57; }
.code-box-dots span:nth-child(2) { background: #febc2e; }
.code-box-dots span:nth-child(3) { background: #28c840; }

.code-box-lang {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(139, 92, 246, 0.2);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: rgba(139, 92, 246, 0.3);
  color: var(--text-primary);
}

.copy-btn svg {
  width: 14px;
  height: 14px;
}

.copy-btn.copied {
  background: rgba(34, 211, 238, 0.2);
  border-color: rgba(34, 211, 238, 0.3);
  color: var(--accent-start);
}

.code-box pre {
  height: 500px;
  overflow: auto;
  padding: 1.25rem;
  margin: 0;
  max-width: 100%;
}

.code-box code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre;
  word-wrap: normal;
}

/* Syntax highlighting */
.code-box .keyword { color: #c678dd; }
.code-box .string { color: #98c379; }
.code-box .number { color: #d19a66; }
.code-box .comment { color: #5c6370; font-style: italic; }
.code-box .function { color: #61afef; }
.code-box .type { color: #e5c07b; }
.code-box .property { color: #e06c75; }
.code-box .operator { color: #56b6c2; }

/* ===== Resilience Stack ===== */
.resilience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.resilience-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all var(--transition-fast);
}

.resilience-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--primary-mid);
  transform: translateY(-4px);
}

.resilience-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
}

.resilience-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.resilience-card h4 {
  margin-bottom: 0.5rem;
}

.resilience-card p {
  font-size: 0.9rem;
}

/* ===== Workflow Capabilities ===== */
.workflow-section {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
}

.workflow-intro {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3rem;
}

.workflow-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.workflow-type-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.workflow-type-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
}

.workflow-type-card h4 {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.workflow-type-card h4 svg {
  width: 20px;
  height: 20px;
  color: var(--accent-start);
}

.workflow-type-card ul {
  margin-top: 1rem;
}

.workflow-type-card li {
  color: var(--text-secondary);
  padding: 0.4rem 0;
  padding-left: 1.25rem;
  position: relative;
  font-size: 0.9rem;
}

.workflow-type-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-start);
}

.comparison-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
}

.comparison-box h3 {
  text-align: center;
  margin-bottom: 2rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-darker);
}

.comparison-table td {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.comparison-table tr:hover td {
  background: rgba(139, 92, 246, 0.05);
}

.check-icon {
  color: var(--accent-start);
}

.x-icon {
  color: var(--text-muted);
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  padding: 4rem 2rem 2rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-section h5 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-section a {
  display: block;
  color: var(--text-secondary);
  padding: 0.4rem 0;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--accent-start);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--primary-mid);
}

.footer-bottom a:hover {
  color: var(--accent-start);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
}

@media (max-width: 768px) {
  :root {
    --navbar-height: 60px;
  }
  
  .navbar {
    padding: 0 1rem;
  }
  
  .brand-name {
    font-size: 1.1rem;
  }
  
  .nav-link > span:not(.nav-icon) {
    display: none;
  }
  
  .navbar-right {
    gap: 0.2rem;
  }
  
  .nav-link {
    padding: 0.5rem;
  }
  
  .hero {
    padding: 3rem 1.5rem;
  }
  
  .section {
    padding: 3rem 1.5rem;
  }
  
  .tabs-header {
    flex-wrap: wrap;
    overflow-x: hidden;
  }
  
  .tab-btn {
    min-width: auto;
    flex: 1 1 calc(33.33% - 2px);
    padding: 0.75rem 0.5rem;
    font-size: 0.7rem;
    text-align: center;
  }
  
  .code-box pre {
    height: 400px;
  }
  
  .comparison-table {
    display: block;
    overflow-x: auto;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .tab-btn {
    flex: 1 1 calc(50% - 2px);
    padding: 0.6rem 0.4rem;
    font-size: 0.65rem;
  }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-mid);
}

/* ===== Selection ===== */
::selection {
  background: rgba(139, 92, 246, 0.3);
  color: var(--text-primary);
}