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CSS_REFERENCE.md

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CSS Reference Guide for AI Generation

Quick Copy-Paste Patterns

Modern Button

.button {
  padding: 12px 32px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

.button:active {
  transform: translateY(0);
}

Glass Card

.glass-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

Hero Section

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
  padding: 80px 24px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.2;
}

.hero p {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

Responsive Grid

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  padding: 80px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

Card Component

.card {
  background: white;
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

Input Field

.input {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  border: 2px solid #E5E7EB;
  border-radius: 8px;
  transition: border-color 0.3s;
  background: white;
}

.input:focus {
  outline: none;
  border-color: #6366F1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

Navigation Bar

.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
}

Color Palettes

Palette 1: Modern Purple

:root {
  --primary: #667eea;
  --secondary: #764ba2;
  --accent: #f093fb;
  --bg: #fafafa;
  --text: #1a202c;
}

Palette 2: Vibrant Blue

:root {
  --primary: #4F46E5;
  --secondary: #06B6D4;
  --accent: #EC4899;
  --bg: #F9FAFB;
  --text: #1F2937;
}

Palette 3: Fresh Green

:root {
  --primary: #10B981;
  --secondary: #059669;
  --accent: #34D399;
  --bg: #F0FDF4;
  --text: #064E3B;
}

Animations

Fade In

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

Pulse

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

.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

Slide Up

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-up {
  animation: slideUp 0.5s ease-out;
}

Responsive Breakpoints

/* Mobile First */
.container {
  padding: 16px;
}

/* Tablet */
@media (min-width: 768px) {
  .container {
    padding: 24px;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .container {
    padding: 32px;
    max-width: 1200px;
    margin: 0 auto;
  }
}

/* Large Desktop */
@media (min-width: 1280px) {
  .container {
    max-width: 1400px;
  }
}

Spacing Scale (8px system)

:root {
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --space-12: 96px;
  --space-16: 128px;
}

Typography Scale

:root {
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */
  --text-5xl: 3rem;      /* 48px */
  --text-6xl: 3.75rem;   /* 60px */
}

Shadow System

:root {
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);
}

Must-Have Base Styles

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

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

::selection {
  background: var(--primary);
  color: white;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

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