/*
 * NextLevel - Design System
 * A learning platform for entrepreneurs
 */

/* ============================================
   FONTS
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Newsreader:ital,wght@0,400;0,500;0,600;1,400&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES
   The soul of our design system
   ============================================ */
:root {
  /* === Color Philosophy ===
     Warm, human, inviting - not cold tech.
     Deep backgrounds let content breathe. */
  
  /* Canvas - The foundation */
  --canvas-deep: #0D0D0F;
  --canvas-base: #141417;
  --canvas-elevated: #1C1C21;
  --canvas-float: #232329;
  
  /* Surface - Cards, panels, interactive elements */
  --surface-primary: #28282F;
  --surface-secondary: #1E1E24;
  --surface-tertiary: #353540;
  --surface-hover: #3A3A47;
  
  /* Text - Clear hierarchy */
  --text-primary: #FAFAFA;
  --text-secondary: #A1A1AA;
  --text-tertiary: #71717A;
  --text-inverse: #0D0D0F;
  
  /* Accent - Warm coral, inspiring and energetic */
  --accent-primary: #FF6B4A;
  --accent-primary-hover: #FF8266;
  --accent-primary-muted: rgba(255, 107, 74, 0.15);
  --accent-primary-glow: rgba(255, 107, 74, 0.4);
  
  /* Secondary accent - Soft violet for contrast */
  --accent-secondary: #A78BFA;
  --accent-secondary-muted: rgba(167, 139, 250, 0.15);
  
  /* Semantic colors */
  --semantic-success: #4ADE80;
  --semantic-success-muted: rgba(74, 222, 128, 0.15);
  --semantic-warning: #FBBF24;
  --semantic-warning-muted: rgba(251, 191, 36, 0.15);
  --semantic-info: #60A5FA;
  --semantic-info-muted: rgba(96, 165, 250, 0.15);
  
  /* Borders - Subtle, purposeful */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-default: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.15);
  --border-accent: rgba(255, 107, 74, 0.4);
  
  /* === Typography Scale ===
     Based on a 1.25 ratio for harmony */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  
  --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 */
  
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  
  /* === Spacing ===
     8px base unit for consistency */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  
  /* === Radius ===
     Organic, approachable curves */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;
  
  /* === Shadows ===
     Depth without heaviness */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px var(--accent-primary-glow);
  --shadow-inner: inset 0 1px 2px rgba(0, 0, 0, 0.3);
  
  /* === Transitions ===
     Smooth, intentional motion */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;
  
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* === Z-Index Scale === */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--canvas-deep);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Selection styling */
::selection {
  background: var(--accent-primary);
  color: var(--text-inverse);
}

/* Scrollbar - Minimal, unobtrusive */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--surface-tertiary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--surface-hover);
}

/* Focus styles - Visible, accessible */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* ============================================
   TYPOGRAPHY UTILITIES
   ============================================ */

/* Headings - Confident, clear */
.heading-1 {
  font-family: var(--font-serif);
  font-size: var(--text-5xl);
  font-weight: 500;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.heading-2 {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 500;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.heading-3 {
  font-family: var(--font-sans);
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: var(--leading-snug);
}

.heading-4 {
  font-family: var(--font-sans);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: var(--leading-snug);
}

.heading-5 {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-snug);
}

/* Body text */
.body-lg {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
}

.body-base {
  font-size: var(--text-base);
  line-height: var(--leading-normal);
}

.body-sm {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

/* Labels and captions */
.label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.caption {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* Text colors */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-accent { color: var(--accent-primary); }
.text-success { color: var(--semantic-success); }
.text-warning { color: var(--semantic-warning); }

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* Grid */
.grid { display: grid; }

/* Spacing */
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.m-auto { margin: auto; }
.mt-auto { margin-top: auto; }
.ml-auto { margin-left: auto; }

/* Visibility */
.hidden { display: none; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Overflow */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-y-auto { overflow-y: auto; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }
.inset-0 { inset: 0; }

/* Width/Height */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }