/* ==========================================================================
   Pionäär Framework Website - Design System v2
   Editorial-style with sophisticated glass morphism
   ========================================================================== */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ========================================================================== */

:root {
  /* Color Palette v2 - Editorial Light Gray */
  --color-bg-primary: #F5F5F5;           /* Main background - light gray */
  --color-bg-secondary: #E8E8E8;         /* Secondary background - medium gray */
  --color-content-bg: rgba(255, 255, 255, 0.90); /* Content containers with transparency */
  --color-glass-bg: rgba(255, 255, 255, 0.75);   /* Glass morphism backgrounds */
  
  --color-text-primary: #1A1A1A;         /* Near black - main text */
  --color-text-secondary: #6B6B6B;       /* Medium gray - secondary text */
  --color-text-tertiary: #8A8A8A;        /* Light gray - metadata */
  
  --color-border: rgba(0, 0, 0, 0.10);   /* 10% opacity borders */
  --color-border-light: rgba(0, 0, 0, 0.05); /* 5% opacity subtle borders */
  
  /* Accent Colors (Minimal Usage) */
  --color-accent-primary: #2C5F7C;       /* Framework brand - minimal usage */
  --color-accent-secondary: #0A7EA3;     /* Links, small colored elements */
  
  /* Typography v2 */
  --font-primary: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
  
  /* Navigation */
  --font-nav: 16px;
  --font-weight-nav: 500; /* Medium */
  
  /* Body Text */
  --font-body: 17px;
  --font-weight-body: 400; /* Regular */
  --line-height-body: 1.7;
  
  /* Headings */
  --font-h1: 40px;
  --font-h2: 30px;
  --font-h3: 23px;
  --font-h4: 19px;
  --font-weight-heading: 550; /* Medium to Semibold */
  --letter-spacing-heading: -0.02em; /* Slight negative tracking */
  
  /* Metadata/Labels */
  --font-meta: 13px;
  --font-weight-meta: 400; /* Regular */
  --color-meta: var(--color-text-tertiary);
  
  /* Spacing Scale (8px base) */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 60px;
  --space-2xl: 80px;
  --space-3xl: 120px;
  
  /* Layout Dimensions */
  --sidebar-width: 300px;
  --content-max-width: 1400px;
  --content-padding: 50px;
  --secondary-sidebar-width: 220px;
  
  /* Transitions */
  --transition-fast: 200ms ease-in-out;
  --transition-medium: 300ms ease-in-out;
  --transition-slow: 400ms ease-in-out;
  
  /* Responsive Breakpoints */
  --breakpoint-mobile: 767px;
  --breakpoint-tablet: 1023px;
  --breakpoint-desktop: 1024px;
  --breakpoint-wide: 1440px;
}

/* ==========================================================================
   RESET & FOUNDATION
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-primary);
  font-size: var(--font-body);
  font-weight: var(--font-weight-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 1em 0;
  font-weight: var(--font-weight-heading);
  letter-spacing: var(--letter-spacing-heading);
  line-height: 1.3;
}

h1 { font-size: var(--font-h1); }
h2 { font-size: var(--font-h2); }
h3 { font-size: var(--font-h3); }
h4 { font-size: var(--font-h4); }

p {
  margin: 0 0 1.5em 0;
  max-width: 75ch; /* Optimal line length for readability */
}

/* Strong typography hierarchy */
.text-large {
  font-size: 20px;
  line-height: 1.6;
}

.text-small {
  font-size: var(--font-meta);
  color: var(--color-text-secondary);
}

.text-meta {
  font-size: var(--font-meta);
  font-weight: var(--font-weight-meta);
  color: var(--color-meta);
}

/* ==========================================================================
   GLASS MORPHISM SYSTEM
   ========================================================================== */

.glass-morphism {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
  border-radius: 8px;
}

.glass-morphism-strong {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  border-radius: 12px;
}

.glass-morphism-subtle {
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.03);
  border-radius: 6px;
}

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

/* Main Layout Container */
.main-layout {
  display: flex;
  min-height: 100vh;
}

/* Primary Navigation Sidebar */
.primary-nav {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: rgba(245, 245, 245, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-right: 1px solid var(--color-border-light);
  z-index: 1000;
  padding: var(--space-lg) var(--space-md);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* Main Content Area */
.main-content {
  margin-left: var(--sidebar-width);
  width: calc(100vw - var(--sidebar-width));
  max-width: var(--content-max-width);
  padding: var(--content-padding);
  flex: 1;
}

/* Content Container with Glass Morphism */
.content-container {
  background: var(--color-content-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: var(--content-padding);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.5);
}

/* Two-column layout with secondary sidebar */
.content-with-sidebar {
  display: flex;
  gap: var(--space-lg);
}

.secondary-sidebar {
  width: var(--secondary-sidebar-width);
  flex-shrink: 0;
}

.main-article {
  flex: 1;
  min-width: 0; /* Prevent flex overflow */
}

/* ==========================================================================
   NAVIGATION COMPONENTS
   ========================================================================== */

.nav-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  margin-bottom: var(--space-xl);
  letter-spacing: -0.01em;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  transition: var(--transition-fast);
}

.nav-brand:hover,
.nav-brand.active {
  background: rgba(255, 255, 255, 0.6);
  color: var(--color-accent-secondary);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

.nav-item {
  margin-bottom: var(--space-sm);
}

.nav-link {
  display: block;
  padding: 12px 16px;
  font-size: var(--font-nav);
  font-weight: var(--font-weight-nav);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255, 255, 255, 0.6);
  color: var(--color-accent-secondary);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

/* Make Strategy Execution Framework link stand out as main page */
.nav-link[href="/framework/"] {
  font-weight: 900;
}

/* Hide search box for MVP */
.nav-search {
  display: none;
}

/* Footer alignment to match main content layout - only for footers outside main content */
body > footer,
.main-layout > footer {
  margin-left: var(--sidebar-width);
  width: calc(100vw - var(--sidebar-width));
}

/* Specialist profile responsive layout */
.specialist-profile {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
}

.specialist-avatar {
  width: 120px;
  height: 120px;
  flex-shrink: 0;
  border-radius: 50%;
  object-fit: cover;
}

@media (max-width: 768px) {
  .specialist-profile {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }
  
  .specialist-avatar {
    width: 100px;
    height: 100px;
    margin-bottom: 1rem;
  }
}

.nav-footer {
  margin-top: auto;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

.nav-search {
  margin-bottom: var(--space-md);
}

.nav-contact {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ==========================================================================
   BUTTONS & INTERACTIVE ELEMENTS
   ========================================================================== */

/* Circular Icon Buttons */
.button-circular {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-medium);
  text-decoration: none;
  color: var(--color-text-secondary);
}

.button-circular:hover {
  opacity: 0.75;
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  color: var(--color-accent-secondary);
}

/* Primary CTA Buttons */
.button-primary {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 24px;
  background: var(--color-accent-primary);
  color: white;
  border: none;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-medium);
  text-align: center;
}

.button-primary:hover {
  opacity: 0.85;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(44, 95, 124, 0.2);
  color: white;
}

/* Secondary Button */
.button-secondary {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 20px;
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-medium);
  text-align: center;
}

.button-secondary:hover {
  background: var(--color-glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-color: var(--color-accent-secondary);
  color: var(--color-accent-secondary);
}

/* ==========================================================================
   SEARCH INPUT
   ========================================================================== */

.search-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.5);
  font-size: 14px;
  font-family: var(--font-primary);
  transition: var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent-secondary);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.search-input::placeholder {
  color: var(--color-text-tertiary);
}

/* ==========================================================================
   LINKS
   ========================================================================== */

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

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

/* Content links */
.content a {
  color: var(--color-accent-secondary);
  text-decoration: underline;
  text-decoration-color: rgba(10, 126, 163, 0.3);
  text-underline-offset: 3px;
}

.content a:hover {
  text-decoration-color: rgba(10, 126, 163, 1);
}

/* ==========================================================================
   CARD COMPONENTS
   ========================================================================== */

.card {
  background: var(--color-glass-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--color-border-light);
  border-radius: 12px;
  padding: var(--space-md);
  transition: var(--transition-medium);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  border-color: var(--color-border);
}

.card-title {
  font-size: var(--font-h3);
  font-weight: var(--font-weight-heading);
  margin-bottom: var(--space-sm);
}

.card-excerpt {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-meta);
  color: var(--color-meta);
}

/* ==========================================================================
   IMAGE TREATMENT
   ========================================================================== */

.hero-image {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: var(--space-xl);
  opacity: 0;
  animation: fadeIn 0.6s ease-in forwards;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

.author-avatar-large {
  width: 80px;
  height: 80px;
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

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

.content-fade-in {
  animation: fadeIn 0.6s ease-out;
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.slide-in-left {
  animation: slideInLeft 0.5s ease-out;
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

*:focus-visible {
  outline: 2px solid var(--color-accent-secondary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  
  .glass-morphism,
  .glass-morphism-strong,
  .glass-morphism-subtle {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(255, 255, 255, 0.95);
  }
}

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

/* Tablet: 768px - 1023px */
@media (max-width: 1023px) {
  :root {
    --content-padding: 32px;
    --font-h1: 34px;
    --font-h2: 26px;
    --font-body: 16px;
  }
  
  .primary-nav {
    position: fixed;
    left: -100%;
    transition: left var(--transition-medium);
    z-index: 2000;
    width: 280px;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.1);
  }
  
  .primary-nav.open {
    left: 0;
  }
  
  .main-content {
    margin-left: 0;
    width: 100vw;
  }
  
  body > footer,
  .main-layout > footer {
    margin-left: 0;
    width: 100%;
    padding-left: 1rem;
    padding-right: 1rem;
    box-sizing: border-box;
  }
  
  .content-with-sidebar {
    flex-direction: column;
  }
  
  .secondary-sidebar {
    width: 100%;
    order: -1;
  }
  
  /* Navigation overlay */
  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
  }
  
  .nav-overlay.open {
    opacity: 1;
    visibility: visible;
  }
  
  /* Mobile menu toggle */
  .mobile-menu-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 2100;
    width: 44px;
    height: 44px;
    background: var(--color-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
  }
  
  .mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.9);
  }
}

/* Mobile: 0px - 767px */
@media (max-width: 767px) {
  :root {
    --content-padding: 20px;
    --space-lg: 32px;
    --space-xl: 48px;
    --font-h1: 30px;
    --font-h2: 24px;
    --font-body: 16px;
  }
  
  .primary-nav {
    padding: var(--space-md);
  }
  
  .content-container {
    padding: var(--space-lg);
  }
  
  /* Simplify glass effects for performance */
  .glass-morphism,
  .glass-morphism-strong {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }
  
  /* Stack buttons vertically on mobile */
  .button-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }
  
  .button-group .button-primary,
  .button-group .button-secondary {
    width: 100%;
  }
}

/* Wide screens: 1440px+ */
@media (min-width: 1440px) {
  :root {
    --content-padding: 60px;
    --font-h1: 44px;
    --font-h2: 32px;
  }
}

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

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

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Hide on mobile */
@media (max-width: 767px) {
  .hide-mobile { display: none; }
}

/* Hide on tablet and mobile */
@media (max-width: 1023px) {
  .hide-tablet { display: none; }
}

/* Show only on mobile and tablet */
@media (min-width: 1024px) {
  .show-mobile-only { display: none; }
}