/* Design System for Mental Health Pattern Recognition Assistant Website */

:root {
  /* Color Palette */
  --primary: #6366F1;      /* Indigo - Primary brand color */
  --primary-light: #818CF8; /* Lighter shade of primary */
  --primary-dark: #4F46E5;  /* Darker shade of primary */
  
  --secondary: #EC4899;    /* Pink - Secondary accent color */
  --secondary-light: #F472B6;
  --secondary-dark: #DB2777;
  
  --neutral-100: #F3F4F6;  /* Lightest gray */
  --neutral-200: #E5E7EB;
  --neutral-300: #D1D5DB;
  --neutral-400: #9CA3AF;
  --neutral-500: #6B7280;
  --neutral-600: #4B5563;
  --neutral-700: #374151;
  --neutral-800: #1F2937;
  --neutral-900: #111827;  /* Darkest gray */
  
  --success: #10B981;      /* Green - Success messages */
  --warning: #F59E0B;      /* Amber - Warning messages */
  --error: #EF4444;        /* Red - Error messages */
  --info: #3B82F6;         /* Blue - Information messages */
  
  --background: #FFFFFF;   /* White - Main background */
  --background-alt: #F9FAFB; /* Off-white - Alternative background */
  
  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-secondary: 'Poppins', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */
  --font-size-6xl: 3.75rem;  /* 60px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  --spacing-32: 8rem;     /* 128px */
  
  /* Borders */
  --border-radius-sm: 0.125rem;  /* 2px */
  --border-radius-md: 0.375rem;  /* 6px */
  --border-radius-lg: 0.5rem;    /* 8px */
  --border-radius-xl: 0.75rem;   /* 12px */
  --border-radius-2xl: 1rem;     /* 16px */
  --border-radius-3xl: 1.5rem;   /* 24px */
  --border-radius-full: 9999px;  /* Fully rounded */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Transitions */
  --transition-fast: 150ms;
  --transition-normal: 300ms;
  --transition-slow: 500ms;
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index */
  --z-0: 0;
  --z-10: 10;
  --z-20: 20;
  --z-30: 30;
  --z-40: 40;
  --z-50: 50;
  --z-auto: auto;
  
  /* Container widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* Base styles */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--neutral-800);
  background-color: var(--background);
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-top: 0;
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-4);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast) var(--transition-timing);
}

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

/* Responsive breakpoints */
/* Mobile first approach */
.container {
  width: 100%;
  padding-left: var(--spacing-4);
  padding-right: var(--spacing-4);
  margin-left: auto;
  margin-right: auto;
}

/* Small devices (640px and up) */
@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}

/* Medium devices (768px and up) */
@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}

/* Large devices (1024px and up) */
@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}

/* Extra large devices (1280px and up) */
@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

/* 2XL devices (1536px and up) */
@media (min-width: 1536px) {
  .container {
    max-width: var(--container-2xl);
  }
}

/* Button styles */
.btn {
  display: inline-block;
  font-weight: var(--font-weight-medium);
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-normal) var(--transition-timing);
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: white;
}

.btn-secondary {
  background-color: var(--secondary);
  color: white;
}

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  color: white;
}

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

.btn-outline:hover {
  background-color: var(--primary);
  color: white;
}

.btn-lg {
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-sm);
}

/* Form elements */
.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-weight: var(--font-weight-medium);
}

.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--neutral-700);
  background-color: var(--background);
  background-clip: padding-box;
  border: 1px solid var(--neutral-300);
  border-radius: var(--border-radius-md);
  transition: border-color var(--transition-normal) var(--transition-timing);
}

.form-control:focus {
  border-color: var(--primary-light);
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(99, 102, 241, 0.25);
}

/* Card styles */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  word-wrap: break-word;
  background-color: var(--background);
  background-clip: border-box;
  border: 1px solid var(--neutral-200);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.card-body {
  flex: 1 1 auto;
  padding: var(--spacing-6);
}

.card-title {
  margin-bottom: var(--spacing-4);
}

.card-text:last-child {
  margin-bottom: 0;
}

/* Animation classes */
.fade-in {
  animation: fadeIn var(--transition-normal) var(--transition-timing);
}

.slide-up {
  animation: slideUp var(--transition-normal) var(--transition-timing);
}

.pulse {
  animation: pulse 2s var(--transition-timing) infinite;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

/* Utility classes */
.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-left {
  text-align: left;
}

.d-flex {
  display: flex;
}

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

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

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

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

.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-5 { margin-top: var(--spacing-5); }

.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-5 { margin-bottom: var(--spacing-5); }

.ml-1 { margin-left: var(--spacing-1); }
.ml-2 { margin-left: var(--spacing-2); }
.ml-3 { margin-left: var(--spacing-3); }
.ml-4 { margin-left: var(--spacing-4); }
.ml-5 { margin-left: var(--spacing-5); }

.mr-1 { margin-right: var(--spacing-1); }
.mr-2 { margin-right: var(--spacing-2); }
.mr-3 { margin-right: var(--spacing-3); }
.mr-4 { margin-right: var(--spacing-4); }
.mr-5 { margin-right: var(--spacing-5); }

.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-5 { padding: var(--spacing-5); }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.rounded { border-radius: var(--border-radius-md); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-full { border-radius: var(--border-radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-none { box-shadow: none; }

.bg-primary { background-color: var(--primary); }
.bg-secondary { background-color: var(--secondary); }
.bg-light { background-color: var(--background-alt); }
.bg-dark { background-color: var(--neutral-800); }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-light { color: var(--neutral-100); }
.text-dark { color: var(--neutral-800); }
.text-muted { color: var(--neutral-500); }

/* Interactive animation styles */
.hover-lift {
  transition: transform var(--transition-normal) var(--transition-timing);
}

.hover-lift:hover {
  transform: translateY(-5px);
}

.hover-scale {
  transition: transform var(--transition-normal) var(--transition-timing);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-shadow {
  transition: box-shadow var(--transition-normal) var(--transition-timing);
}

.hover-shadow:hover {
  box-shadow: var(--shadow-xl);
}

/* Parallax effect */
.parallax {
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* Gradient backgrounds */
.bg-gradient-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.bg-gradient-secondary {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
}

/* Scroll animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-normal) var(--transition-timing);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Custom cursor */
.custom-cursor {
  position: fixed;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: rgba(99, 102, 241, 0.5);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.1s ease;
}

.cursor-follower {
  position: fixed;
  width: 40px;
  height: 40px;
  border: 2px solid rgba(99, 102, 241, 0.3);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: transform 0.3s ease, width 0.3s ease, height 0.3s ease;
}