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

:root {
  --bg-primary: #0A0E1A;
  --bg-secondary: #111827;
  --bg-tertiary: #1F2937;
  --accent-blue: #3B82F6;
  --accent-blue-light: #60A5FA;
  --accent-blue-glow: rgba(59, 130, 246, 0.15);
  --accent-amber: #F59E0B;
  --accent-amber-glow: rgba(245, 158, 11, 0.15);
  --text-primary: #F9FAFB;
  --text-secondary: #D1D5DB;
  --text-muted: #6B7280;
  --grid-line: rgba(59, 130, 246, 0.05);
  --border: rgba(255, 255, 255, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Grid overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--accent-blue); text-decoration: none; }
a:hover { color: var(--accent-blue-light); }

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

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); }

.problem-content p,
.section-header p,
.hero-subtitle { max-width: 65ch; }

/* ===== LAYOUT ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header p {
  margin: 1rem auto 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ===== NAVIGATION ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.6rem 0;
  box-shadow: 0 1px 0 var(--border);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--accent-blue);
}

.nav-links {
  display: none;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 1px;
}

.nav-cta {
  display: none;
  padding: 0.5rem 1.25rem;
  background: var(--accent-blue);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

.nav-cta:hover {
  background: #2563EB;
  transform: translateY(-1px);
  color: #fff !important;
}

/* Hamburger */
.nav-hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
  z-index: 1001;
}

.nav-hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 26, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: 999;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu a {
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: 5rem;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.35;
}

.hero-gradient {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(transparent, var(--bg-primary));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 1.5rem;
}

.hero h1 {
  margin-bottom: 1.25rem;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-amber));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.btn-primary {
  display: inline-block;
  padding: 0.875rem 2.5rem;
  background: var(--accent-blue);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  background: #2563EB;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.3);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.hero-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
  color: var(--accent-amber);
  flex-shrink: 0;
}

/* ===== PROBLEM SECTION ===== */
.problem {
  background: var(--bg-secondary);
}

.problem-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.problem-content p {
  margin: 0 auto 1.5rem;
  font-size: 1.05rem;
  line-height: 1.75;
}

.problem-content p:last-child {
  margin-bottom: 0;
}

.problem-content strong {
  color: var(--text-primary);
}

/* ===== METRICS SECTION ===== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.metric-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}

.metric-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.2);
}

.metric-value {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--accent-blue);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-value .symbol {
  font-size: 0.6em;
  color: var(--accent-amber);
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Per-class table */
.accuracy-table-wrapper {
  max-width: 700px;
  margin: 0 auto;
}

.accuracy-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.accuracy-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}

.accuracy-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

.accuracy-table tr:last-child td {
  border-bottom: none;
}

.accuracy-table .target-name {
  color: var(--text-primary);
  font-weight: 500;
}

.accuracy-bar-cell {
  position: relative;
}

.accuracy-bar {
  height: 6px;
  background: var(--accent-blue);
  border-radius: 3px;
  transition: width 1s ease;
}

.accuracy-score {
  color: var(--accent-blue);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.metrics-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 2rem;
  font-style: italic;
}

/* ===== HOW IT WORKS ===== */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  position: relative;
}

.step {
  text-align: center;
  padding: 2rem 1.5rem;
  position: relative;
}

.step-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.25rem;
  background: var(--accent-blue-glow);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon svg {
  width: 28px;
  height: 28px;
  color: var(--accent-blue);
}

.step-number {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.step h3 {
  margin-bottom: 0.75rem;
}

.step p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0 auto;
}

/* Step connector arrows (vertical on mobile) */
.step-connector {
  display: flex;
  justify-content: center;
  color: var(--accent-blue);
  opacity: 0.3;
}

.step-connector svg {
  width: 24px;
  height: 24px;
  transform: rotate(90deg);
}

/* Pipeline diagram */
.pipeline {
  margin-top: 3rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

.pipeline-node {
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.pipeline-arrow {
  color: var(--accent-blue);
  opacity: 0.4;
  font-size: 0.75rem;
}

/* ===== CAPABILITIES ===== */
.capabilities {
  background: var(--bg-secondary);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.capability-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.capability-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.15);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.capability-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 1.25rem;
  background: var(--accent-blue-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.capability-icon svg {
  width: 22px;
  height: 22px;
  color: var(--accent-blue);
}

.capability-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.capability-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== USE CASES ===== */
.usecases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.usecase-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--transition), border-color var(--transition);
}

.usecase-card:hover {
  transform: translateY(-2px);
  border-color: rgba(59, 130, 246, 0.15);
}

.usecase-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  background: var(--accent-amber-glow);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.usecase-icon svg {
  width: 22px;
  height: 22px;
  color: var(--accent-amber);
}

.usecase-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.usecase-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== CONTACT ===== */
.contact {
  background: var(--bg-secondary);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.contact-info h2 {
  margin-bottom: 1rem;
}

.contact-info p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.contact-detail {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.contact-detail svg {
  width: 18px;
  height: 18px;
  color: var(--accent-blue);
  flex-shrink: 0;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px var(--accent-blue-glow);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-group select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236B7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* Honeypot */
.form-hp { display: none !important; }

.form-submit {
  padding: 0.875rem 2.5rem;
  background: var(--accent-blue);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  align-self: flex-start;
}

.form-submit:hover {
  background: #2563EB;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.3);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-success,
.form-error {
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  display: none;
}

.form-success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: #10B981;
}

.form-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #EF4444;
}

.form-note {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== FOOTER ===== */
.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-logo {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1rem;
}

.footer-logo span { color: var(--accent-blue); }

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--transition);
}

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

.footer-copy {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ===== ANIMATIONS ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children .animate-on-scroll:nth-child(1) { transition-delay: 0s; }
.stagger-children .animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.stagger-children .animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.stagger-children .animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.stagger-children .animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.stagger-children .animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

/* ===== RESPONSIVE ===== */
@media (min-width: 640px) {
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .capabilities-grid { grid-template-columns: repeat(2, 1fr); }
  .usecases-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
  .nav-cta {
    display: inline-block;
  }
  .nav-hamburger {
    display: none;
  }

  .metrics-grid { grid-template-columns: repeat(4, 1fr); }

  .steps {
    grid-template-columns: 1fr auto 1fr auto 1fr;
    align-items: flex-start;
  }
  .step-connector svg {
    transform: none;
    margin-top: 2rem;
  }

  .contact-wrapper {
    grid-template-columns: 1fr 1.2fr;
  }
}

@media (min-width: 1024px) {
  section { padding: 6rem 0; }

  .capabilities-grid { grid-template-columns: repeat(3, 1fr); }

  .usecases-grid { grid-template-columns: repeat(3, 1fr); }

  .footer .container {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 1280px) {
  .hero h1 { font-size: 3.75rem; }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
  html { scroll-behavior: auto; }
}