/* VivekaSutra — Custom Stylesheet */

/* =========================================================
   Design Tokens
   ========================================================= */
:root {
  --bg-900:       #060810;
  --bg-800:       #0c1120;
  --bg-700:       #111827;
  --bg-card:      #161f35;
  --bg-card-hover:#1c2a45;

  --accent-purple: #7c3aed;
  --accent-blue:   #3b82f6;
  --accent-violet: #a855f7;
  --accent-cyan:   #06b6d4;

  --grad-primary:  linear-gradient(135deg, #7c3aed, #3b82f6);
  --grad-hero:     linear-gradient(135deg, #7c3aed 0%, #3b82f6 50%, #06b6d4 100%);

  --text-primary:  #f1f5f9;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;

  --border:        rgba(124, 58, 237, 0.2);
  --border-hover:  rgba(124, 58, 237, 0.5);

  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;

  --shadow-card: 0 4px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(124,58,237,0.15);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-900);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-violet); }

img { max-width: 100%; display: block; }

/* =========================================================
   Typography
   ========================================================= */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--text-primary);
}

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

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-purple);
  margin-bottom: 0.75rem;
}

/* =========================================================
   Layout
   ========================================================= */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section { padding: 6rem 0; }

/* =========================================================
   Navbar
   ========================================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(6, 8, 16, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  height: 68px;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo-img {
  height: 85px;
  width: auto;
  display: block;
  margin-top: 10px;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

.nav-cta {
  background: var(--grad-primary);
  color: #fff !important;
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-weight: 600 !important;
}

.nav-cta:hover { opacity: 0.9; color: #fff !important; }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 68px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124,58,237,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 50%, rgba(59,130,246,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124,58,237,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,58,237,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
  padding: 4rem 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(124,58,237,0.1);
  border: 1px solid rgba(124,58,237,0.3);
  border-radius: 50px;
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-violet);
  margin-bottom: 2rem;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-violet);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

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

.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.2s, transform 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); color: #fff; }

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border-hover);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  border-color: var(--accent-purple);
  background: rgba(124,58,237,0.08);
  transform: translateY(-2px);
  color: var(--text-primary);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.stat-item { text-align: center; }
.stat-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.25rem; }

/* =========================================================
   Cards
   ========================================================= */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: border-color 0.3s, background 0.3s, transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* =========================================================
   What We Do
   ========================================================= */
.what-we-do { background: var(--bg-800); }

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header h2 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1rem; }
.section-header p  { color: var(--text-secondary); max-width: 560px; margin: 0 auto; }

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.pillar-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(124,58,237,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(124,58,237,0.2);
}

.pillar-card h3 { font-size: 1.1rem; margin-bottom: 0.75rem; }
.pillar-card p  { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* =========================================================
   Libraries
   ========================================================= */
.libraries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: 2rem;
}

.lib-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.lib-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.lib-header { display: flex; align-items: flex-start; gap: 1rem; }

.lib-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  flex-shrink: 0;
}

.lib-header-text h3 { font-size: 1.3rem; margin-bottom: 0.25rem; }
.lib-header-text .lib-version {
  font-size: 0.75rem;
  color: var(--accent-purple);
  font-family: var(--font-mono);
  background: rgba(124,58,237,0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  border: 1px solid rgba(124,58,237,0.2);
}

.lib-desc { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

.lib-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.lib-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.lib-features li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-purple);
  flex-shrink: 0;
}

.lib-install {
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lib-install span { color: var(--text-muted); }

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

.lib-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: 50px;
  transition: all 0.2s;
}

.lib-link-primary {
  background: var(--grad-primary);
  color: #fff;
}
.lib-link-primary:hover { opacity: 0.9; color: #fff; transform: translateY(-1px); }

.lib-link-outline {
  border: 1px solid var(--border-hover);
  color: var(--text-secondary);
}
.lib-link-outline:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
  background: rgba(124,58,237,0.08);
}

/* =========================================================
   Tech Stack
   ========================================================= */
.tech-section { background: var(--bg-800); }

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.tech-chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.tech-chip:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
  background: rgba(124,58,237,0.08);
}

/* =========================================================
   CTA Banner
   ========================================================= */
.cta-section {
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
}

.cta-inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 4rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: '';
  position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  width: 600px;
  height: 2px;
  background: var(--grad-hero);
  border-radius: 2px;
}

.cta-inner h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 1rem; }
.cta-inner p  { color: var(--text-secondary); max-width: 500px; margin: 0 auto 2rem; }

/* =========================================================
   Footer
   ========================================================= */
footer {
  background: var(--bg-800);
  border-top: 1px solid var(--border);
  padding: 3.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 260px;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col ul li a { font-size: 0.9rem; color: var(--text-secondary); transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--text-primary); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

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

/* =========================================================
   Docs Pages
   ========================================================= */
.docs-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
  padding-top: 68px;
}

.docs-sidebar {
  background: var(--bg-800);
  border-right: 1px solid var(--border);
  padding: 2rem 1.5rem;
  position: sticky;
  top: 68px;
  height: calc(100vh - 68px);
  overflow-y: auto;
}

.sidebar-section { margin-bottom: 2rem; }

.sidebar-section h4 {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.sidebar-links { list-style: none; display: flex; flex-direction: column; gap: 0.25rem; }

.sidebar-links a {
  display: block;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.sidebar-links a:hover,
.sidebar-links a.active {
  background: rgba(124,58,237,0.1);
  color: var(--text-primary);
  border-left: 2px solid var(--accent-purple);
}

.docs-content {
  padding: 3rem 4rem 6rem;
  max-width: 860px;
}

.docs-hero {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.docs-hero h1 { font-size: 2.5rem; margin-bottom: 0.75rem; }
.docs-hero p  { color: var(--text-secondary); font-size: 1.1rem; }

.docs-section { margin-bottom: 3.5rem; }
.docs-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 90px;
}
.docs-section h3 { font-size: 1.1rem; margin: 1.75rem 0 0.75rem; color: var(--accent-violet); }
.docs-section p  { color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.8; }

/* Code blocks */
pre {
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}

pre code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e2e8f0;
  line-height: 1.7;
}

code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(124,58,237,0.1);
  border: 1px solid rgba(124,58,237,0.2);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  color: var(--accent-violet);
}

/* Syntax highlight approximation */
.kw  { color: #c084fc; }  /* keyword */
.fn  { color: #60a5fa; }  /* function */
.st  { color: #34d399; }  /* string */
.cm  { color: #4b5563; }  /* comment */
.cl  { color: #fbbf24; }  /* class name */
.nm  { color: #f1f5f9; }  /* normal */
.dc  { color: #94a3b8; }  /* decorator */
.nb  { color: #fb923c; }  /* number / built-in */

/* Info / note box */
.doc-note {
  background: rgba(59,130,246,0.07);
  border: 1px solid rgba(59,130,246,0.2);
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Method / param table */
.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin: 1.25rem 0;
}

.doc-table th {
  text-align: left;
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--border);
}

.doc-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

.doc-table td:first-child {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-cyan);
}

.doc-table tr:hover td { background: rgba(124,58,237,0.04); }

/* Pip install badge */
.install-block {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-900);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
  margin: 1.25rem 0;
}

.install-block span { color: var(--text-muted); user-select: none; }

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent-purple); }
.breadcrumb span { color: var(--text-primary); }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px) {
  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar { display: none; }
  .docs-content { padding: 2rem 1.5rem 4rem; }
  .libraries-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  section { padding: 4rem 0; }
  .nav-links { display: none; }
  .hero h1 { font-size: 2.2rem; }
  .hero-stats { gap: 1.5rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-inner { padding: 2.5rem 1.5rem; }
  .pillars-grid { grid-template-columns: 1fr; }
}