/* === MAIN.CSS - CORE STYLES & VARIABLES === */

/* CSS Reset */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* CSS Variables */
:root {
  /* Colors */
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1a;
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #a0a0a0;
  --color-text-tertiary: #666;
  --color-accent: #4a9eff;
  --color-accent-hover: #6ab0ff;
  --color-success: #10b981;
  --color-border: #222;
  --color-border-light: #333;
  
  /* Layout */
  --nav-height: 70px;
  --mobile-nav-height: 65px;
  --container-max-width: 1400px;
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --spacing-xl: 96px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.4s ease;
  --transition-slow: 0.6s ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 50px;
  
  /* Z-index layers */
  --z-grain: 1000;
  --z-cursor: 999;
  --z-nav: 998;
  --z-mobile-nav: 997;
  --z-modal: 1001;
}

/* Base Styles */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 20px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  overflow-x: hidden;
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
  padding-bottom: var(--mobile-nav-height);
}

@media (min-width: 901px) {
  body {
    padding-bottom: 0;
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  color: var(--color-text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
  line-height: 1.8;
  color: var(--color-text-secondary);
}

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

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

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

/* Selection Styling */
::selection {
  background: rgba(74,158,255,0.3);
  color: var(--color-text-primary);
}

::-moz-selection {
  background: rgba(74,158,255,0.3);
  color: var(--color-text-primary);
}

/* Focus Styles */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* Grain Texture */
.grain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.03;
  pointer-events: none;
  z-index: var(--z-grain);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Cursor Glow (Desktop only) */
.cursor-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74,158,255,0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: var(--z-cursor);
  transform: translate(-50%, -50%);
  will-change: transform;
  transition: opacity 0.3s;
}

@media (max-width: 1024px) {
  .cursor-glow { display: none; }
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: calc(var(--nav-height) + 40px) 40px 40px;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .container {
    padding: calc(var(--nav-height) + 20px) 20px 20px;
  }
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(10,10,10,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-nav);
  transition: all var(--transition-fast);
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  text-decoration: none;
  transition: transform var(--transition-fast);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav a:not(.nav-logo) {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: 8px 0;
}

.nav a:not(.nav-logo):hover,
.nav a:not(.nav-logo):focus {
  color: var(--color-text-primary);
}

.nav a:not(.nav-logo)::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-medium);
}

.nav a:not(.nav-logo):hover::after,
.nav a.active::after {
  width: 100%;
}

.nav a.active {
  color: var(--color-accent);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--transition-fast);
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Bottom Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--mobile-nav-height);
  background: rgba(10,10,10,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border);
  z-index: var(--z-mobile-nav);
  padding: 0;
  justify-content: space-around;
  align-items: center;
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px 12px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  flex: 1;
  min-width: 60px;
}

.mobile-nav-item svg {
  width: 24px;
  height: 24px;
}

.mobile-nav-item span {
  font-size: 0.7rem;
  font-weight: 500;
}

.mobile-nav-item.active {
  color: var(--color-accent);
}

.mobile-nav-item:active {
  transform: scale(0.95);
  background: rgba(74,158,255,0.1);
}

/* Section Styles */
.section {
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-header {
  margin-bottom: var(--spacing-lg);
}

.section-label {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(74,158,255,0.1);
  border: 1px solid rgba(74,158,255,0.2);
  border-radius: var(--radius-full);
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-medium);
  cursor: pointer;
  border: none;
  min-height: 52px;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(74,158,255,0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74,158,255,0.4);
}

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

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
  min-height: 56px;
}

/* Footer */
footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg) 40px;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 30px;
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-text {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.footer-tech {
  color: var(--color-text-tertiary);
  font-size: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: translateY(-3px);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-light);
  border-radius: 5px;
}

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

/* Loading State */
img {
  background: var(--color-bg-secondary);
  transition: opacity var(--transition-medium);
}

img:not([src]) {
  opacity: 0;
}

/* Print Styles */
@media print {
  .nav,
  .mobile-nav,
  .cursor-glow,
  .grain,
  .btn {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
    padding-bottom: 0;
  }
  
  .section {
    opacity: 1 !important;
    transform: none !important;
    page-break-inside: avoid;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-text-primary: #fff;
    --color-text-secondary: #ddd;
    --color-border: #444;
  }
}