@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #e0e7ff;
  --bg-color: #ffffff;
  --bg-light: #f8fafc;
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--text-dark);
  background-color: var(--bg-color);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3, h4 {
  color: var(--text-dark);
  font-weight: 800;
  line-height: 1.2;
}

.container {
  width: min(100% - 3rem, 1200px);
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 24px;
  flex-direction: column;
  justify-content: space-between;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.is-active span:nth-child(1) {
  transform: translateY(10.5px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-10.5px) rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  font-weight: 500;
  font-size: 0.95rem;
}

.site-nav a:not(.btn) {
  color: var(--text-muted);
  transition: color 0.2s;
}

.site-nav a:not(.btn):hover, .site-nav a.active {
  color: var(--text-dark);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary-sm {
  padding: 10px 20px;
  font-size: 0.9rem;
  background: var(--primary);
  color: #fff !important;
  border-radius: 8px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover, .btn-primary-sm:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

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

.btn-secondary:hover {
  background: var(--border);
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 36px;
  font-size: 1.1rem;
}

/* Hero Section */
.hero-section {
  padding: 100px 0;
  background: radial-gradient(circle at top right, var(--primary-light), transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.hero-content h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.03em;
  margin: 0 0 24px;
}

.hero-content p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin: 0 0 40px;
  max-width: 90%;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 50px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  border-top: 1px solid var(--border);
  padding-top: 30px;
}

.stat strong {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-dark);
}

.stat span {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-image img {
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 20px 30px rgba(79, 70, 229, 0.15));
}

.floating-badge {
  position: absolute;
  top: 10%;
  left: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  padding: 12px 20px;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #10b981;
  display: inline-block;
}

/* Base sections */
.section {
  padding: 100px 0;
}

.bg-light {
  background-color: var(--bg-light);
}

.section-header {
  margin-bottom: 60px;
}

.section-header.center {
  text-align: center;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  margin: 0;
}

.grid {
  display: grid;
  gap: 30px;
}

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

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* Cards */
.card {
  background: var(--bg-color);
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

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

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 24px;
}

.card h3 {
  font-size: 1.4rem;
  margin: 0 0 16px;
}

.card p {
  color: var(--text-muted);
  margin: 0;
}

/* Lists */
.check-list {
  list-style: none;
  padding: 0;
  margin: 30px 0 0;
}

.check-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 16px;
  color: var(--text-dark);
  font-weight: 500;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--primary);
  font-weight: 800;
}

/* CTA */
.cta-inner {
  background: var(--primary);
  border-radius: var(--radius-lg);
  padding: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  box-shadow: var(--shadow-lg);
}

.cta-content h2 {
  color: #fff;
  font-size: 2.5rem;
  margin: 0 0 10px;
}

.cta-content p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin: 0;
}

.cta-inner .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: none;
}

.cta-inner .btn-primary:hover {
  background: var(--bg-light);
  color: var(--primary-hover);
}

/* Footer */
.site-footer {
  background-color: var(--bg-light);
  padding: 60px 0 30px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  max-width: 300px;
  margin-top: 10px;
}

.footer-links {
  display: flex;
  gap: 24px;
  font-weight: 500;
}

.footer-links a {
  color: var(--text-muted);
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  padding-top: 30px;
}

/* Animations */
.fade-up, .fade-down, .fade-left, .fade-right, .fade-in, .scroll-fade-up, .scroll-fade-in {
  opacity: 0;
  will-change: transform, opacity;
}

.fade-up { transform: translateY(30px); }
.fade-down { transform: translateY(-30px); }
.fade-left { transform: translateX(30px); }
.fade-right { transform: translateX(-30px); }

.is-visible {
  opacity: 1 !important;
  transform: translate(0) scale(1) !important;
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
}

.delay-1 { transition-delay: 0.1s !important; }
.delay-2 { transition-delay: 0.2s !important; }
.delay-3 { transition-delay: 0.3s !important; }
.delay-4 { transition-delay: 0.4s !important; }

.hover-lift {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

/* Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.form-group label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-dark);
}

.form-group input, 
.form-group select, 
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-color);
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-dark);
  transition: all 0.3s ease;
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-light);
}

.contact-info-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Snake demo */
.snake-page .page-hero {
  padding: 72px 0 36px;
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
}

.snake-page .page-hero h1 {
  font-size: clamp(2.25rem, 4vw, 3.5rem);
  margin: 0 0 16px;
}

.snake-page .page-hero p:last-child {
  max-width: 620px;
  color: var(--text-muted);
  margin: 0;
}

.snake-section {
  padding-top: 60px;
}

.snake-layout {
  display: grid;
  grid-template-columns: minmax(280px, 560px) minmax(240px, 320px);
  align-items: start;
  justify-content: center;
  gap: 32px;
}

.snake-board-panel,
.snake-panel {
  background: var(--bg-color);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.snake-board-panel {
  padding: clamp(12px, 3vw, 20px);
}

.snake-board {
  --snake-grid-size: 20;
  display: grid;
  grid-template-columns: repeat(var(--snake-grid-size), 1fr);
  width: min(100%, 520px);
  aspect-ratio: 1;
  background: #eef2ff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.snake-cell {
  aspect-ratio: 1;
  background: var(--bg-light);
  box-shadow: inset 0 0 0 1px rgba(226, 232, 240, 0.65);
}

.snake-cell-body {
  background: var(--primary);
}

.snake-cell-head {
  background: var(--primary-hover);
}

.snake-cell-food {
  background: #ef4444;
}

.snake-panel {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 24px;
}

.snake-score-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.snake-score-card span {
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.snake-score-card strong {
  color: var(--text-dark);
  font-size: 2.25rem;
  line-height: 1;
}

.snake-status {
  min-height: 52px;
  margin: 0;
  color: var(--text-muted);
}

.snake-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.snake-actions .btn {
  width: 100%;
  border: 0;
}

.snake-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.snake-control {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-light);
  color: var(--text-dark);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.snake-control:hover,
.snake-control:focus-visible {
  border-color: var(--primary);
  outline: none;
}

.snake-control-up {
  grid-column: 2;
}

.snake-control[data-snake-direction="left"] {
  grid-column: 1;
}

.snake-control[data-snake-direction="down"] {
  grid-column: 2;
}

.snake-control[data-snake-direction="right"] {
  grid-column: 3;
}

/* Resp */
@media (max-width: 900px) {
  .hero-grid, .split-grid { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; text-align: center; gap: 30px; }
  .snake-layout { grid-template-columns: 1fr; }
  .snake-panel { width: 100%; }
  
  .menu-toggle {
    display: flex;
  }
  
  .site-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: white;
    padding: 20px;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border);
    gap: 20px;
    align-items: flex-start;
  }
  
  .site-nav.is-open {
    display: flex;
  }
}