/* ============================================
   VARIABLES
   ============================================ */
:root {
  /* Colors - Warm & Serene Palette */
  --color-background: #FFFFFF;
  --color-background-warm: #FAFAF8;
  --color-surface: #FFFFFF;
  
  /* Primary: Soft Aqua Blue */
  --color-primary-50: #ECFEFF;
  --color-primary-100: #CFFAFE;
  --color-primary-200: #A5F3FC;
  --color-primary-300: #67E8F9;
  --color-primary-400: #22D3EE;
  --color-primary-500: #06B6D4;
  --color-primary-600: #0891B2;
  
  /* Secondary: Light Mint Green */
  --color-success-50: #F0FDF4;
  --color-success-100: #DCFCE7;
  --color-success-200: #BBF7D0;
  --color-success-500: #22C55E;
  
  /* Accent: Gentle Lavender */
  --color-accent-50: #FAF5FF;
  --color-accent-100: #F3E8FF;
  --color-accent-200: #E9D5FF;
  --color-accent-500: #A855F7;
  
  /* Warm Neutrals */
  --color-neutral-50: #FAFAF9;
  --color-neutral-100: #F5F5F4;
  --color-neutral-200: #E7E5E4;
  --color-neutral-300: #D6D3D1;
  --color-neutral-400: #A8A29E;
  --color-neutral-500: #78716C;
  --color-neutral-600: #57534E;
  --color-neutral-700: #44403C;
  --color-neutral-800: #292524;
  --color-neutral-900: #1C1917;
  
  /* Semantic Colors */
  --color-text: var(--color-neutral-800);
  --color-text-muted: var(--color-neutral-500);
  --color-text-inverse: var(--color-background);
  --color-border: var(--color-neutral-200);
  
  /* Status Colors */
  --color-warning: #FCD34D;
  --color-danger: #FCA5A5;
  --color-danger-dark: #EF4444;
  
  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: Georgia, Cambria, 'Times New Roman', Times, serif;
  --font-mono: 'Fira Code', Consolas, Monaco, 'Andale Mono', monospace;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing Scale */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows - Soft & Polished */
  --shadow-sm: 0 1px 2px 0 rgba(87, 83, 78, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(87, 83, 78, 0.05), 0 2px 4px -2px rgba(87, 83, 78, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(87, 83, 78, 0.05), 0 4px 6px -4px rgba(87, 83, 78, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(87, 83, 78, 0.05), 0 8px 10px -6px rgba(87, 83, 78, 0.05);
  --shadow-inner: inset 0 2px 4px 0 rgba(87, 83, 78, 0.05);
  
  /* Transitions */
  --duration-fast: 150ms;
  --duration-base: 200ms;
  --duration-slow: 300ms;
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

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

ul,
ol {
  list-style: none;
}

/* ============================================
   BASE STYLES
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--space-4); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--space-3); }
h4 { font-size: var(--text-xl); margin-bottom: var(--space-2); }
h5 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
h6 { font-size: var(--text-base); margin-bottom: var(--space-2); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

a {
  transition: color var(--duration-fast) var(--ease-in-out);
}

a:hover {
  color: var(--color-primary-500);
}

a:focus-visible {
  outline: 2px solid var(--color-primary-300);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================
   UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-4 {
  gap: var(--space-4);
}

.grid {
  display: grid;
}

/* ============================================
   COMPONENTS
   ============================================ */
/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--leading-none);
  border-radius: var(--radius-lg);
  transition: all var(--duration-base) var(--ease-in-out);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-200);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
  background-color: var(--color-primary-500);
  color: var(--color-text-inverse);
  border-color: var(--color-primary-500);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-600);
  border-color: var(--color-primary-600);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-success-100);
  color: var(--color-success-500);
  border-color: var(--color-success-200);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-success-200);
  border-color: var(--color-success-500);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-neutral-50);
  border-color: var(--color-neutral-300);
}

/* Input */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-base) var(--ease-in-out);
}

.input::placeholder {
  color: var(--color-text-muted);
}

.input:hover {
  border-color: var(--color-neutral-300);
}

.input:focus {
  outline: none;
  border-color: var(--color-primary-400);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

.input:disabled {
  background-color: var(--color-neutral-50);
  cursor: not-allowed;
}

/* Card */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-neutral-100);
  transition: transform var(--duration-base) var(--ease-in-out), 
              box-shadow var(--duration-base) var(--ease-in-out);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card--lavender {
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-accent-50) 100%);
  border-color: var(--color-accent-100);
}

.card--mint {
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-success-50) 100%);
  border-color: var(--color-success-100);
}