@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* Color Palette - Dark Precision/Linear */
  --surface-canvas: #090A0C;
  --surface-card: #121418;
  --surface-elevated: #1A1D23;
  --surface-subtle: rgba(255, 255, 255, 0.03);
  
  --text-primary: #F2F4F8;
  --text-secondary: #9BA1AD;
  --text-muted: #5D6470;
  
  --border-default: rgba(255, 255, 255, 0.08);
  --border-prominent: rgba(255, 255, 255, 0.16);
  
  --accent-primary: #3B82F6;
  --accent-warning: #F59E0B;
  
  --status-success: #10B981;
  --status-error: #EF4444;

  /* Typography */
  --font-ui: system-ui, -apple-system, 'SF Pro Display', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Spacing Scale (8px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  
  /* Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Layout */
  --content-max-width: 1200px;
}

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

body {
  font-family: var(--font-ui);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--surface-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "cv01", "ss03";
}

/* Global Transitions */
a, button, .point-card, .device-item {
  transition: transform 120ms cubic-bezier(0.4, 0, 0.2, 1), 
              border-color 120ms ease, 
              box-shadow 240ms cubic-bezier(0.16, 1, 0.3, 1),
              background-color 120ms ease;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Base Layout Constraints */
section, header, footer {
  padding: var(--space-12) var(--space-4);
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* Typography Base */
h1, h2, h3 {
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--text-primary);
}

h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Section Header Decoration */
h2::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  background-color: var(--accent-primary);
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.4);
}

/* Header & Hero */
.company-intro {
  background: rgba(18, 20, 24, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  padding: var(--space-16) var(--space-4);
  text-align: center;
  margin-bottom: var(--space-12);
  position: relative;
  overflow: hidden;
}

/* Subtle Hero Glow */
.company-intro::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
  z-index: -1;
}

#company-name {
  font-size: 2.5rem;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #FFFFFF 0%, #A0A5B0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0;
}

/* Selling Points Grid (Bento) */
.points-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.point-card {
  background: var(--surface-card);
  padding: var(--space-6);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  font-weight: 500;
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.point-card svg {
  flex-shrink: 0;
  color: var(--text-secondary);
}

.point-card:hover {
  border-color: var(--border-prominent);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  background: var(--surface-elevated);
}

.point-card:hover svg {
  color: var(--accent-primary);
}

/* Use Cases */
.use-cases {
  border-top: 1px solid var(--border-default);
  padding-top: var(--space-12);
}

#use-cases-container {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

#use-cases-container li {
  padding: var(--space-3) var(--space-4);
  background: var(--surface-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  font-size: 0.875rem;
}

#use-cases-container li::before {
  content: '—';
  color: var(--accent-primary);
  font-family: var(--font-mono);
  margin-right: var(--space-3);
  font-weight: 600;
}

/* Device Showcase */
.device-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

.device-item {
  background: var(--surface-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-default);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.device-item:hover {
  border-color: var(--border-prominent);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

.device-item h2 {
  font-size: 1.125rem;
  margin: 0;
  padding: var(--space-4) var(--space-6);
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-default);
  background: var(--surface-elevated);
}

.device-item h2::before {
  display: none; /* Override section header decoration */
}

/* Video Container */
.video-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-bottom: 1px solid var(--border-default);
}

.device-item video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.device-item p {
  padding: var(--space-4) var(--space-6);
  color: var(--text-secondary);
  font-size: 0.875rem;
  flex-grow: 1;
}

/* States */
.loading, .empty-state, .error-state {
  text-align: center;
  padding: var(--space-12);
  background: var(--surface-card);
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  grid-column: 1 / -1;
}

.loading {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.error-state {
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--status-error);
}

/* Contact Console */
.contact-footer {
  margin-top: var(--space-8);
  border-top: 1px solid var(--border-default);
  background: var(--surface-card);
  text-align: center;
}

.contact-footer h2 {
  justify-content: center;
}

.contact-console {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-8);
  background: var(--surface-canvas);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
}

#wechat-qr {
  width: 160px;
  height: 160px;
  padding: 8px;
  background: #FFFFFF;
  border-radius: var(--radius-sm);
  display: block;
}

.phone-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.phone-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#contact-phone {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
}

/* ICP Footer */
#icp-footer {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border-top: 1px solid var(--border-default);
}

#icp-footer a {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-decoration: none;
  font-family: var(--font-mono);
  transition: color 120ms ease;
}

#icp-footer a:hover {
  color: var(--text-secondary);
  text-decoration: underline;
}

/* Focus States for Accessibility */
a:focus-visible, button:focus-visible, video:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Desktop Breakpoints */
@media (min-width: 640px) {
  section, header, footer {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }

  .points-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }

  #use-cases-container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  #company-name {
    font-size: 3.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .device-list {
    grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  }
}