/**
 * Main Stylesheet
 * 
 * Contains the design system (CSS variables), base styles, typography,
 * layout utilities, buttons, theme toggle, and home button styles.
 * 
 * This file serves as the foundation for the entire site's styling.
 * All theme-aware variables are defined here for easy customization.
 * 
 * @fileoverview Core styles and design system for nmokey.com
 */

/* ============================================
   DESIGN SYSTEM - Tailwind-like Variables
   Easy to customize colors, spacing, etc.
   ============================================ */

:root {
  /* Colors - Dark Mode (Default) */
  --color-primary: #60a5fa;        /* Light blue - main brand */
  --color-primary-hover: #3b82f6;  /* Medium blue on hover */
  --color-primary-light: #133baa;   /* Dark blue for backgrounds */
  
  --color-text: #f9fafb;            /* Light gray for text */
  --color-text-light: #d1d5db;     /* Medium gray for secondary text */
  --color-text-lighter: #9ca3af;    /* Light gray for subtle text */
  
  --color-bg: #0f172a;              /* Dark blue background */
  --color-bg-alt: #1e293b;          /* Slightly lighter dark background */
  --color-bg-hover: #334155;        /* Hover background */
  
  --color-border: #334155;          /* Dark border */
  --color-border-hover: #475569;    /* Border on hover */
  
  --color-accent: #a78bfa;          /* Light purple accent */
  --color-accent-hover: #8b5cf6;    /* Medium purple */
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
  
  --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 */
  --text-7xl: 4.5rem;      /* 72px */
  
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
  
  /* Spacing - 4px base unit */
  --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 */
  --space-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius: 0.5rem;       /* 8px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1rem;     /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;  /* Full circle */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-slower: 700ms ease;
  
  /* Z-index */
  --z-menu: 1000;
  --z-overlay: 900;
  --z-dropdown: 800;
}

/* Light Mode */
[data-theme="light"] {
  --color-primary: #2563eb;        /* Blue - main brand */
  --color-primary-hover: #1d4ed8;  /* Darker blue on hover */
  --color-primary-light: #dbeafe;   /* Light blue for backgrounds */
  
  --color-text: #1f2937;            /* Dark gray for text */
  --color-text-light: #6b7280;     /* Medium gray for secondary text */
  --color-text-lighter: #9ca3af;    /* Light gray for subtle text */
  
  --color-bg: #ffffff;              /* White background */
  --color-bg-alt: #f9fafb;          /* Light gray background */
  --color-bg-hover: #f3f4f6;        /* Hover background */
  
  --color-border: #e5e7eb;          /* Light border */
  --color-border-hover: #d1d5db;    /* Border on hover */
  
  --color-accent: #8b5cf6;          /* Purple accent */
  --color-accent-hover: #7c3aed;    /* Darker purple */
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

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

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

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

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

ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.page-content {
  min-height: calc(100vh - 200px);
  padding: var(--space-16) 0;
  position: relative;
  z-index: 1;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text);
  background: rgba(30, 41, 59, 0.15); /* Very transparent dark background for frosted glass */
  backdrop-filter: blur(4px) saturate(180%);
  -webkit-backdrop-filter: blur(4px) saturate(180%);
  border: 2px solid rgba(255, 255, 255, 0.1); /* Subtle border */
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
}

/* Remove any underline animations from buttons */
.btn::after,
.btn:hover::after {
  display: none !important;
}

.btn:hover {
  background: rgba(30, 41, 59, 0.25); /* Slightly more opaque on hover */
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--color-text);
  border-color: rgba(255, 255, 255, 0.2); /* Slightly more visible border on hover */
}

/* Light mode frosted glass for buttons */
[data-theme="light"] .btn {
  background: rgba(255, 255, 255, 0.2); /* Very transparent white for light mode */
  border: 2px solid rgba(0, 0, 0, 0.1); /* Subtle border for light mode */
}

[data-theme="light"] .btn:hover {
  background: rgba(255, 255, 255, 0.3); /* Slightly more opaque on hover */
  border-color: rgba(0, 0, 0, 0.15); /* Slightly more visible border on hover */
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

/* ============================================
   CARDS & CONTAINERS
   ============================================ */

.card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

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

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

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

.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

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

/* ============================================
   THEME TOGGLE
   ============================================ */

.theme-toggle {
  position: fixed;
  top: var(--space-6);
  right: var(--space-6);
  width: 56px;
  height: 56px;
  z-index: calc(var(--z-menu) + 5);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent; /* No background */
  border: none;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  box-shadow: none; /* No shadow initially */
  padding: 0;
  color: var(--color-text);
}

.theme-toggle svg {
  width: 24px;
  height: 24px;
  transition: all var(--transition-base);
}

.theme-toggle:hover {
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
  background: var(--color-primary);
  color: white;
}

.theme-toggle:hover svg {
  stroke: white;
}

/* ============================================
   THEME TRANSITION OVERLAY
   ============================================ */

.theme-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0; /* Behind content (z-index: 1+) but above body background */
  /* Use clip-path for radial reveal */
  clip-path: circle(0% at var(--origin-x, 50%) var(--origin-y, 50%));
  transition: clip-path 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-transition-overlay.active {
  /* Expand to cover entire viewport */
  clip-path: circle(150% at var(--origin-x, 50%) var(--origin-y, 50%));
}

/* ============================================
   HOME BUTTON
   ============================================ */

.home-button {
  position: fixed;
  top: var(--space-6);
  left: var(--space-6); /* Top left corner */
  width: 56px;
  height: 56px;
  z-index: calc(var(--z-menu) + 5);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent; /* No background */
  border: none;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  box-shadow: none; /* No shadow initially */
  padding: 0;
  text-decoration: none;
  color: var(--color-text);
}

.home-button svg {
  width: 24px;
  height: 24px;
  transition: all var(--transition-base);
}

.home-button:hover {
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
  background: var(--color-primary);
  color: white;
}

.home-button:hover svg {
  stroke: white;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media screen and (max-width: 768px) {
  :root {
    --text-4xl: 2rem;
    --text-3xl: 1.75rem;
    --text-2xl: 1.5rem;
  }
  
  .container {
    padding: 0 var(--space-4);
  }
  
  .page-content {
    padding: var(--space-8) 0;
  }
  
  .theme-toggle {
    width: 44px;
    height: 44px;
    top: var(--space-4);
    right: var(--space-4);
  }
}

@media screen and (max-width: 480px) {
  :root {
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
  }
}