:root {
  --primary: #0284c7;
  /* Sky 600 - Main Brand Color */
  --secondary: #0f766e;
  /* Teal 700 - Accent */
  --accent: #06b6d4;
  /* Cyan 500 - Highlight */
  --text-main: #0f172a;
  /* Slate 900 */
  --text-muted: #64748b;
  /* Slate 500 */
  --bg-color: #f0f9ff;
  /* Very Light Sky */
  --glass-bg: rgba(255, 255, 255, 0.85);
  /* Slightly more opaque for legibility */
  --glass-border: rgba(255, 255, 255, 0.8);
  --glass-shadow: 0 8px 24px -6px rgba(14, 165, 233, 0.15);
  /* Subtle blue tinted shadow */
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
}

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

body {
  font-family: var(--font-body);
  color: var(--text-main);
  min-height: 100vh;
  /* Fresh, airy gradient - No Purple */
  background: linear-gradient(120deg, #f0f9ff 0%, #dcfce7 100%);
  background-attachment: fixed;
  /* Keeps gradient stable on scroll */
  padding: 2rem 1rem;
  line-height: 1.6;
}



.header,
.container {
  width: min(1000px, 94vw);
  margin: 0 auto;
}

/* Header Styling */
.header {
  text-align: center;
  margin-bottom: 2rem;
  padding: 2rem 1rem;
}

.header h1 {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  /* Modern 'Tech/Fresh' Gradient text */
  background: linear-gradient(135deg, #0284c7 0%, #14b8a6 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
  filter: drop-shadow(0 2px 4px rgba(2, 132, 199, 0.1));
}

.header p {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 500;
}

/* Controls (Search + Button) */
.controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  position: sticky;
  top: 20px;
  z-index: 100;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.controls input {
  flex: 1;
  padding: 0.8rem 1.2rem;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
  font-size: 1rem;
  font-family: var(--font-body);
  transition: all 0.2s ease;
  color: var(--text-main);
}

.controls input:focus {
  outline: none;
  background: white;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}



/* Groups Layout */
.groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.group {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02), 0 10px 15px rgba(0, 0, 0, 0.01);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(255, 255, 255, 0.6);
  display: flex;
  flex-direction: column;
}

.group:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 30px -10px rgba(14, 165, 233, 0.15);
  /* Soft blue glow on hover */
  border-color: rgba(14, 165, 233, 0.3);
  background: rgba(255, 255, 255, 0.95);
}

.group h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid rgba(226, 232, 240, 0.6);
  font-weight: 700;
}

/* Chips */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.chip {
  background: white;
  border: 1px solid #e2e8f0;
  padding: 0.6rem 1rem;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.chip:hover {
  background: #f8fafc;
  border-color: var(--secondary);
  color: var(--secondary);
  transform: scale(1.05);
  box-shadow: 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.chip:active {
  transform: scale(0.95);
  background: var(--secondary);
  color: white;
  border-color: var(--secondary);
}

/* Footer Links */
.contact,
.upscaler {
  position: fixed;
  bottom: 1.5rem;
  padding: 0.8rem 1.5rem;
  background: white;
  color: var(--text-main);
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  font-family: var(--font-heading);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.2s ease;
  border: 1px solid rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
  backdrop-filter: blur(5px);
}

.contact {
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
}

.contact:hover,
.upscaler:hover {
  transform: translateX(-50%) translateY(-3px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.upscaler {
  left: 1.5rem;
  /* Different positioning for this one */
  bottom: 1.5rem;
  transform: none;
}

.upscaler:hover {
  transform: translateY(-3px);
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
  body {
    padding: 1rem 0.5rem;
  }

  .header h1 {
    font-size: 2.2rem;
  }

  .controls {
    flex-direction: column;
    padding: 0.8rem;
    top: 10px;
  }

  .controls button {
    width: 100%;
  }

  .groups {
    grid-template-columns: 1fr;
  }

  .group {
    padding: 1.25rem;
  }

  .upscaler {
    display: none;
    /* Hide back button on tiny screens to avoid clutter, or move it */
  }

  .contact {
    bottom: 1rem;
    width: 90%;
    text-align: center;
  }
}