/* 
 * Foxontherun — Custom Premium Editorial Stylesheet
 * Brand Values: Selective, Senior, Data-grounded, Long Horizon
 * Design Tone: Understated, Serif-led, Restrained Palette, Generous Whitespace
 */

/* ==========================================================================
   1. Design Tokens & CSS Custom Properties
   ========================================================================== */
:root {
  /* Color Palette (Restrained, Editorial) */
  --bg-color: #F7F6F2;          /* Warm, elegant off-white (not pure white) */
  --bg-white: #FFFFFF;          /* Pure white for scrolled header */
  --text-primary: #1A1A1A;      /* Deep slate, near-black for high readability */
  --text-secondary: #6B6B66;    /* Warm, rich gray for secondary descriptions */
  --accent-color: #B23A2C;      /* Deep editorial red / Oxblood (used sparingly) */
  --border-color: #E2E0D9;      /* Subtle dividing line matching the warm palette */
  
  /* Typography Families */
  --font-serif: 'EB Garamond', Georgia, serif;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Layout Spacing & Structure */
  --container-max-width: 1100px;
  --header-desktop-height: 90px;
  --header-scrolled-height: 70px;
  --header-mobile-height: 70px;
  
  /* System transitions */
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-header: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-scrolled-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-size: 18px; /* Generous body text size on desktop */
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size-adjust: from-font; /* Modern fallback normalization */
  overflow-x: hidden;
}

/* Focus styles for keyboard navigation (WCAG AA Compliance) */
a:focus-visible,
button:focus-visible {
  outline: 2px dashed var(--accent-color);
  outline-offset: 4px;
}

ul {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-smooth);
}

img {
  max-width: 100%;
  height: auto;
}

/* ==========================================================================
   3. Typography Hierarchy
   ========================================================================== */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400; /* Editorial thin/medium weights */
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

/* Headline in Hero */
.hero-headline {
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1.4;
  letter-spacing: 0.03em;
  font-weight: 400;
  max-width: 900px;
}

/* Section Title */
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  line-height: 1.4;
  letter-spacing: 0.02em;
}

/* Practice and Principle Card Titles */
.practice-card-title,
.principle-title {
  font-size: 1.35rem;
  line-height: 1.3;
  font-weight: 500;
  color: var(--text-primary);
}

/* Base Body Texts */
p {
  color: var(--text-primary);
}

.hero-subheadline {
  font-family: var(--font-sans);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 650px;
}

.section-intro {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  line-height: 1.45;
  font-style: italic;
  color: var(--text-primary);
  max-width: 800px;
}

.practice-card-body,
.principle-body {
  font-size: 0.95rem; /* Clean text sizes below base */
  line-height: 1.6;
  color: var(--text-secondary);
}

/* Large client sentence */
.clients-descriptive-text {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.45;
  color: var(--text-primary);
  max-width: 800px;
}

/* About descriptions */
.about-paragraph {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text-primary);
}
.about-paragraph + .about-paragraph {
  margin-top: 24px;
}

/* ==========================================================================
   4. Common Layout & Grid Containers
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding-top: 160px;
  padding-bottom: 160px;
  border-top: 1px solid var(--border-color);
}

/* Asymmetric 12-column Grid for Premium Editorial Feel */
.grid-container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 80px;
  row-gap: 48px;
}

.section-aside {
  grid-column: span 4;
}

.section-main {
  grid-column: span 8;
}

/* Subtle Link Underline Hover Micro-Animation */
.underline-anim {
  position: relative;
  display: inline-block;
}

.underline-anim::after {
  content: '';
  position: absolute;
  width: 100%;
  transform: scaleX(0);
  height: 1px;
  bottom: -2px;
  left: 0;
  background-color: var(--accent-color);
  transform-origin: bottom right;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.underline-anim:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

/* Accent Line (Fine Red Rule) */
.accent-rule {
  border: 0;
  height: 1px;
  background-color: var(--accent-color);
  margin: 40px 0;
}

/* ==========================================================================
   5. Sticky Header Styling
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-desktop-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  transition: height var(--transition-header), background-color var(--transition-header), border-color var(--transition-header);
  background-color: transparent;
}

/* Native scroll-driven transition if supported */
@supports ((animation-timeline: scroll()) and (animation-range: 0% 100%)) {
  .site-header {
    animation: shrinkHeader auto linear both;
    animation-timeline: scroll(block root);
    animation-range: 0px 80px;
  }
  
  @keyframes shrinkHeader {
    to {
      height: var(--header-scrolled-height);
      background-color: var(--bg-white);
      border-color: var(--border-color);
    }
  }
}

/* Class-based fallback scroll styling (toggled via JS) */
.site-header.scrolled {
  height: var(--header-scrolled-height);
  background-color: var(--bg-white);
  border-color: var(--border-color);
}

.header-container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Brand Wordmark (No Symbol, Serif) */
.brand-logo {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  transition: opacity var(--transition-smooth);
}

.brand-logo:hover {
  opacity: 0.8;
}

/* Desktop Anchor Navigation */
.nav-list {
  display: flex;
  gap: 36px;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-primary);
  padding: 4px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-color);
}

/* Mobile Hamburger Menu Toggle (Visual-free, clean line design) */
.mobile-menu-toggle {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 18px;
  position: relative;
  z-index: 1001;
}

.menu-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--text-primary);
  position: absolute;
  left: 0;
  transition: transform var(--transition-smooth), top var(--transition-smooth), bottom var(--transition-smooth), background-color var(--transition-smooth);
}

.menu-bar:first-child {
  top: 2px;
}

.menu-bar:last-child {
  bottom: 2px;
}

/* Toggle transformations */
.mobile-menu-toggle[aria-expanded="true"] .menu-bar:first-child {
  transform: rotate(45deg);
  top: 8px;
}

.mobile-menu-toggle[aria-expanded="true"] .menu-bar:last-child {
  transform: rotate(-45deg);
  bottom: 8px;
}

/* ==========================================================================
   6. Mobile Overlay Navigation
   ========================================================================== */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--bg-color);
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px;
  transform: translateY(-100%);
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  visibility: hidden;
}

.mobile-nav.open {
  transform: translateY(0);
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.mobile-nav-link {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  color: var(--text-primary);
  transition: color var(--transition-smooth);
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
  color: var(--accent-color);
}

/* ==========================================================================
   7. Section 1: Hero (Full Viewport Height)
   ========================================================================== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background-color: var(--bg-color);
  padding-top: var(--header-desktop-height);
  box-sizing: border-box;
}

.hero-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  flex-grow: 1;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* Minimal editorial scroll indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 24px;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.scroll-arrow {
  font-size: 1.1rem;
  color: var(--accent-color);
}

/* ==========================================================================
   8. Section 2: What We Do
   ========================================================================== */
.what-we-do .section-main {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.practice-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.practice-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Proprietary CIE Proof Section styling */
.cie-proof-box {
  margin-top: 40px;
  padding-top: 64px;
  border-top: 1px solid var(--border-color);
}

.cie-paragraph {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 800px;
}

/* ==========================================================================
   9. Section 3: How We Work
   ========================================================================== */
.how-we-work .section-main {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 72px 64px;
}

.principle-item {
  display: flex;
  gap: 28px;
}

.principle-number {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 0.9;
  font-weight: 400;
  color: var(--accent-color);
  flex-shrink: 0;
}

.principle-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ==========================================================================
   10. Section 4: Selected Clients (Statement of Integrity)
   ========================================================================== */
.selected-clients {
  background-color: var(--bg-color);
}

/* ==========================================================================
   11. Section 5: About (Selective Scale & Prague Root)
   ========================================================================== */
.about-content {
  max-width: 680px;
}

.founder-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 64px 48px;
  margin-top: 64px;
}

.founder-card {
  display: flex;
  flex-direction: column;
}

.founder-name {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.founder-role {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.founder-bio {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.founder-link {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  align-self: flex-start;
}

.founder-link:hover {
  color: var(--accent-color);
}

/* ==========================================================================
   12. Section 6: Contact (Get In Touch)
   ========================================================================== */
.contact {
  padding-top: 200px;
  padding-bottom: 220px;
}

.contact-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.contact-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 24px;
}

.contact-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.contact-body-intro {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.contact-email {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4.5vw, 3.4rem);
  line-height: 1.1;
  color: var(--accent-color);
  font-weight: 400;
  margin: 12px 0 24px 0;
}

.contact-details {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact-linkedin {
  font-weight: 500;
  color: var(--text-primary);
}

.contact-linkedin:hover {
  color: var(--accent-color);
}

.contact-separator {
  color: var(--border-color);
}

/* ==========================================================================
   13. Footer (Minimal s.r.o. Details)
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  background-color: var(--bg-color);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-separator {
  margin: 0 4px;
  color: var(--border-color);
}

/* ==========================================================================
   14. Responsive Media Queries
   ========================================================================== */

/* Tablet view styling: 769px to 1024px */
@media (max-width: 1024px) {
  :root {
    --container-max-width: 900px;
  }
  
  .grid-container {
    gap: 32px;
  }
  
  .section-aside {
    grid-column: span 12;
  }
  
  .section-main {
    grid-column: span 12;
  }
  
  .practice-cards-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  
  .section {
    padding-top: 100px;
    padding-bottom: 100px;
  }
}

/* Large Mobile / Standard Tablet sizing */
@media (max-width: 900px) {
  .practice-cards-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .principles-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .founder-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

/* Standard Mobile / Touch devices */
@media (max-width: 768px) {
  body {
    font-size: 16px; /* 16px mobile body copy per UX brief specs */
  }

  .site-header {
    height: var(--header-mobile-height);
    background-color: var(--bg-color); /* Maintain solid warm off-white on mobile header */
  }
  
  .header-container {
    padding: 0 20px;
  }
  
  /* Hide desktop menu, show hamburger */
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .section {
    padding-top: 80px;
    padding-bottom: 80px;
  }
  
  .grid-container {
    gap: 24px;
  }
  
  .hero-section {
    padding-top: var(--header-mobile-height);
  }
  
  .hero-content {
    gap: 24px;
  }
  
  .hero-scroll-indicator {
    display: none; /* Hide on mobile to prioritize headline first view */
  }
  
  .cie-proof-box {
    margin-top: 12px;
    padding-top: 36px;
  }
  
  .contact {
    padding-top: 80px;
    padding-bottom: 100px;
  }
  
  .footer-container {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

/* Extra small mobile adjustments */
@media (max-width: 480px) {
  .header-container {
    padding: 0 16px;
  }
  
  .principle-item {
    gap: 18px;
  }
}