/* 
  Brand: pixelspotlogix
  Theme: Operational Intelligence Blueprint
*/

:root {
  /* Color Palette */
  --op-black: #111820;
  --bp-white: #F8F8F4;
  --logic-blue: #356D9A;
  --process-green: #4B8A70;
  --insight-gold: #C8A45D;
  --grid-grey: #D7DEDC;
  --deep-text: #1B252B;
  --muted-slate: #68736E;
  --accent-copper: #C26D4A;

  /* Typography */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;

  /* Layout */
  --container-width: 1200px;
  --header-height: 80px;

  /* Borders & Shadows */
  --border-thin: 1px solid var(--grid-grey);
  --border-thick: 2px solid var(--op-black);
  --shadow-subtle: 0 4px 6px -1px rgba(17, 24, 32, 0.05), 0 2px 4px -1px rgba(17, 24, 32, 0.03);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--deep-text);
  background-color: var(--bp-white);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Blueprint Grid Background */
.blueprint-bg {
  background-color: var(--bp-white);
  background-image: 
    linear-gradient(var(--grid-grey) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-grey) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center center;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--op-black);
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p { margin-bottom: var(--space-sm); color: var(--muted-slate); }
a { color: var(--logic-blue); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--op-black); }

.tech-label {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--insight-gold);
  margin-bottom: var(--space-xs);
}

/* Layout Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section-padding {
  padding: var(--space-xl) 0;
}

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

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(248, 248, 244, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-thin);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: var(--shadow-subtle);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--op-black);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 24px;
  height: 24px;
  background-color: var(--logic-blue);
  display: inline-block;
  position: relative;
}

.logo-icon::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--bp-white);
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  align-items: center;
}

.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--deep-text);
}

.main-nav a:hover, .main-nav a.active {
  color: var(--logic-blue);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--font-display);
}

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

.btn-primary:hover {
  background-color: var(--logic-blue);
  color: var(--bp-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--op-black);
  border: var(--border-thick);
}

.btn-secondary:hover {
  background-color: var(--grid-grey);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--op-black);
  position: relative;
  transition: background-color 0.3s ease;
}

.hamburger::before, .hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: var(--op-black);
  left: 0;
  transition: transform 0.3s ease, top 0.3s ease;
}

.hamburger::before { top: -6px; }
.hamburger::after { top: 6px; }

.menu-toggle[aria-expanded="true"] .hamburger { background-color: transparent; }
.menu-toggle[aria-expanded="true"] .hamburger::before { transform: rotate(45deg); top: 0; }
.menu-toggle[aria-expanded="true"] .hamburger::after { transform: rotate(-45deg); top: 0; }

/* Hero Section */
.hero {
  padding-top: calc(var(--header-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  border-bottom: var(--border-thin);
}

.hero-content {
  max-width: 800px;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin-bottom: var(--space-md);
}

/* Abstract Blueprint Diagram */
.hero-diagram {
  margin-top: var(--space-lg);
  height: 300px;
  border: var(--border-thick);
  background-color: white;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Process Cards */
.process-card {
  background-color: white;
  border: var(--border-thin);
  padding: var(--space-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.process-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-subtle);
  border-color: var(--logic-blue);
}

.process-icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-sm);
  fill: none;
  stroke: var(--op-black);
  stroke-width: 1.5;
}

/* Framework Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--grid-grey);
}

.timeline-step {
  display: flex;
  gap: var(--space-md);
  position: relative;
}

.timeline-marker {
  width: 40px;
  height: 40px;
  background-color: var(--bp-white);
  border: var(--border-thick);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: var(--op-black);
  z-index: 1;
  flex-shrink: 0;
}

/* Challenge Selector */
.challenge-selector {
  background-color: var(--op-black);
  color: var(--bp-white);
  padding: var(--space-lg) var(--space-md);
}

.challenge-selector h2 { color: var(--bp-white); }
.challenge-selector p { color: var(--grid-grey); }

.challenge-tabs {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.tab-btn {
  background: transparent;
  color: var(--grid-grey);
  border: 1px solid var(--muted-slate);
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--font-body);
}

.tab-btn:hover, .tab-btn.active {
  background-color: var(--logic-blue);
  color: var(--bp-white);
  border-color: var(--logic-blue);
}

.tab-content { display: none; padding: var(--space-md); background: rgba(255,255,255,0.05); border-left: 4px solid var(--logic-blue); }
.tab-content.active { display: block; animation: fadeIn 0.5s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Internal Page Headers */
.page-header {
  padding-top: calc(var(--header-height) + var(--space-lg));
  padding-bottom: var(--space-lg);
  background-color: var(--grid-grey);
  border-bottom: var(--border-thick);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-sm);
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

input, select, textarea {
  width: 100%;
  padding: 0.75rem;
  border: var(--border-thin);
  background-color: white;
  font-family: var(--font-body);
  color: var(--deep-text);
  border-radius: 0;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--logic-blue);
  box-shadow: 0 0 0 2px rgba(53, 109, 154, 0.2);
}

.form-message {
  margin-top: var(--space-sm);
  padding: var(--space-sm);
  background-color: var(--process-green);
  color: white;
  display: none;
}

/* Footer */
.site-footer {
  background-color: var(--op-black);
  color: var(--grid-grey);
  padding: var(--space-lg) 0 var(--space-md);
  border-top: 4px solid var(--logic-blue);
}

.site-footer h4 { color: var(--bp-white); }
.site-footer a { color: var(--grid-grey); }
.site-footer a:hover { color: var(--bp-white); text-decoration: underline; }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-bottom {
  border-top: 1px solid var(--muted-slate);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--muted-slate);
}

.legal-links { display: flex; gap: var(--space-sm); }

/* Info Note (GDPR) */
.info-note {
  background-color: rgba(200, 164, 93, 0.1);
  border-left: 4px solid var(--insight-gold);
  padding: var(--space-sm);
  margin: var(--space-md) 0;
  font-size: 0.9rem;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: var(--bp-white);
  border-top: var(--border-thick);
  padding: var(--space-md);
  z-index: 9999;
  display: none; /* hidden by default, JS controls */
  box-shadow: 0 -4px 10px rgba(0,0,0,0.1);
}

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

.cookie-text { flex: 1; min-width: 300px; font-size: 0.9rem; }
.cookie-actions { display: flex; gap: var(--space-xs); flex-wrap: wrap; }

/* Accessibility */
:focus-visible {
  outline: 3px solid var(--accent-copper);
  outline-offset: 2px;
}

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

/* Utilities */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* Article Card */
.article-card {
  border: var(--border-thin);
  background: white;
  display: flex;
  flex-direction: column;
}
.article-content { padding: var(--space-md); flex-grow: 1; }
.article-footer { padding: var(--space-sm) var(--space-md); border-top: var(--border-thin); background: var(--bp-white); font-size: 0.85rem;}

/* Responsive Breakpoints */
@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-md); }
  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
  
  .menu-toggle { display: block; }
  
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--bp-white);
    padding: var(--space-lg) var(--space-md);
    transition: left 0.3s ease;
    overflow-y: auto;
  }
  
  .main-nav.open { left: 0; }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: var(--space-sm); }
  .main-nav .btn { margin-top: var(--space-md); width: 100%; }
  
  .header-actions { display: none; } /* Hide CTA in header on mobile if in nav */
  
  .hero { padding-top: calc(var(--header-height) + var(--space-md)); }
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .section-padding { padding: var(--space-md) 0; }
  .cookie-actions { flex-direction: column; width: 100%; }
  .cookie-actions .btn { width: 100%; }
}