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

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Global Main Offset for Sticky Navbar */
main {
  padding-top: 4.5rem;
}

/* ==========================================
   LAYOUT HELPER & SPACING UTILITIES
   ========================================== */
.pt-0 { padding-top: 0 !important; }
.pb-0 { padding-bottom: 0 !important; }
.py-0 { padding-top: 0 !important; padding-bottom: 0 !important; }
.pt-xs { padding-top: var(--space-xs) !important; }
.pb-xs { padding-bottom: var(--space-xs) !important; }
.pb-sm { padding-bottom: var(--space-sm) !important; }
.pb-md { padding-bottom: var(--space-md) !important; }
.pb-lg { padding-bottom: var(--space-lg) !important; }

.mt-xxs { margin-top: var(--space-xxs) !important; }
.mt-xs { margin-top: var(--space-xs) !important; }
.mt-sm { margin-top: var(--space-sm) !important; }
.mt-md { margin-top: var(--space-md) !important; }
.mt-lg { margin-top: var(--space-lg) !important; }
.mt-xl { margin-top: var(--space-xl) !important; }
.mt-xxl { margin-top: var(--space-xxl) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-xxs { margin-bottom: var(--space-xxs) !important; }
.mb-xs { margin-bottom: var(--space-xs) !important; }
.mb-sm { margin-bottom: var(--space-sm) !important; }
.mb-md { margin-bottom: var(--space-md) !important; }
.mb-lg { margin-bottom: var(--space-lg) !important; }
.mb-xl { margin-bottom: var(--space-xl) !important; }
.mb-xxl { margin-bottom: var(--space-xxl) !important; }
.mb-3xl { margin-bottom: var(--space-3xl) !important; }

.mx-auto { margin-left: auto !important; margin-right: auto !important; }
.max-w-600 { max-width: 600px !important; }
.max-w-800 { max-width: 800px !important; }

.border-t { border-top: 1px solid var(--color-border) !important; }
.border-b { border-bottom: 1px solid var(--color-border) !important; }
.border-0 { border: none !important; }

.bg-primary { background-color: var(--color-bg-primary) !important; }
.bg-secondary { background-color: var(--color-bg-secondary) !important; }
.bg-tertiary { background-color: var(--color-bg-tertiary) !important; }

.justify-between { justify-content: space-between !important; }
.justify-center { justify-content: center !important; }
.align-center { align-items: center !important; }
.self-start { align-self: flex-start !important; }
.relative { position: relative !important; }

@media (min-width: 992px) {
  .sticky-sidebar {
    position: sticky !important;
    top: 6rem !important;
    height: calc(100vh - 8.5rem) !important;
  }
  .border-l-desktop {
    border-left: 1px solid var(--color-border) !important;
    padding-left: var(--space-xl) !important;
  }
}

/* --- Typography Hierarchy (H1-H6) --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-heading);
  color: var(--color-text-accent);
  letter-spacing: var(--ls-tight);
}

h1 { 
  font-size: var(--font-size-display); 
  font-weight: var(--fw-bold);
  line-height: var(--lh-display);
}
.hero-title {
  font-size: clamp(2.25rem, 1.85rem + 2vw, 3.5rem);
  letter-spacing: var(--ls-wide);
  line-height: 1.05;
  text-transform: uppercase;
  font-weight: var(--fw-bold);
}
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-md); }
h6 { font-size: var(--font-size-sm); letter-spacing: var(--ls-wide); }

/* Paragraph readability settings */
p {
  color: var(--color-text-secondary);
  font-weight: var(--fw-regular);
}

.max-w-prose {
  max-width: 65ch; /* Premium typographic line length */
}

/* Inline links vs standalone action links */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.inline-link {
  color: var(--color-text-accent);
  border-bottom: 1px solid var(--color-accent-muted);
  padding-bottom: 2px;
}

.inline-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

img, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Standalone list styles */
ul.list-bulleted, ol.list-numbered {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

ul.list-bulleted {
  list-style-type: square;
}

ol.list-numbered {
  list-style-type: decimal;
}

ul.list-bulleted li, ol.list-numbered li {
  padding-left: var(--space-xxs);
  color: var(--color-text-secondary);
}

code, pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  line-height: var(--lh-mono);
  background-color: var(--color-bg-secondary);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-border);
}

/* Focus Outline Rules (A11y) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-input-focus);
  outline-offset: 4px;
}

/* ==========================================
   VERTICAL RHYTHM SYSTEM
   ========================================== */

/* The flow utility maps margin-top to child elements dynamically */
.flow > * + * {
  margin-top: var(--flow-space, 1.25rem);
}

.flow-xs { --flow-space: var(--space-xs); }
.flow-sm { --flow-space: var(--space-sm); }
.flow-md { --flow-space: var(--space-md); }
.flow-lg { --flow-space: var(--space-lg); }
.flow-xl { --flow-space: var(--space-xl); }
.flow-xxl { --flow-space: var(--space-xxl); }

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

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container-wide {
  width: 100%;
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.container-narrow {
  width: 100%;
  max-width: 800px; /* Reading container for text-focused templates */
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ==========================================
   SECTIONING SYSTEM
   ========================================== */

.section {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
  position: relative;
}

.section-hero {
  padding-top: var(--space-hero);
  padding-bottom: var(--space-section);
}

/* Section Headers */
.section-header {
  margin-bottom: var(--space-xxl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.section-header.text-center {
  align-items: center;
}

.section-title {
  margin-bottom: var(--space-xxs);
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: var(--font-size-md);
  max-width: 60ch;
}

.section-actions {
  margin-top: var(--space-md);
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* ==========================================
   GRID SYSTEM
   ========================================== */

/* 12 Column Grid System */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
}

.grid {
  display: grid;
  gap: var(--grid-gap);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(1, 1fr); }

@media (min-width: 768px) {
  .grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}


.col-span-12 { grid-column: span 12; }
.col-span-11 { grid-column: span 12; }
.col-span-10 { grid-column: span 12; }
.col-span-9  { grid-column: span 12; }
.col-span-8  { grid-column: span 12; }
.col-span-7  { grid-column: span 12; }
.col-span-6  { grid-column: span 12; }
.col-span-5  { grid-column: span 12; }
.col-span-4  { grid-column: span 12; }
.col-span-3  { grid-column: span 12; }
.col-span-2  { grid-column: span 12; }
.col-span-1  { grid-column: span 12; }

@media (min-width: 768px) {
  .col-span-12 { grid-column: span 12; }
  .col-span-11 { grid-column: span 11; }
  .col-span-10 { grid-column: span 10; }
  .col-span-9  { grid-column: span 9; }
  .col-span-8  { grid-column: span 8; }
  .col-span-7  { grid-column: span 7; }
  .col-span-6  { grid-column: span 6; }
  .col-span-5  { grid-column: span 5; }
  .col-span-4  { grid-column: span 4; }
  .col-span-3  { grid-column: span 3; }
  .col-span-2  { grid-column: span 2; }
  .col-span-1  { grid-column: span 1; }
}

/* Reusable Dividers */
.divider {
  border: 0;
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-3xl) 0;
  width: 100%;
}

/* ==========================================
   PAGE LAYOUT ARCHETYPES
   ========================================== */

/* 1. Landing Page Template Layout */
.layout-landing {
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* 2. Listing Page Template Layout */
.layout-listing {
  padding-bottom: var(--space-section);
}

/* 3. Detail Page Template Layout */
.layout-detail {
  padding-bottom: var(--space-section);
}

.layout-detail-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
}

.layout-detail-main {
  grid-column: span 12;
}

.layout-detail-sidebar {
  grid-column: span 12;
}

@media (min-width: 992px) {
  .layout-detail-main {
    grid-column: span 8;
  }
  .layout-detail-sidebar {
    grid-column: span 4;
  }
}

/* 4. Content Reading Page Template Layout */
.layout-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: var(--space-section);
}

/* 5. Contact Page Template Layout */
.layout-contact {
  padding-bottom: var(--space-section);
}

.layout-contact-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
}

.layout-contact-form {
  grid-column: span 12;
}

.layout-contact-info {
  grid-column: span 12;
}

@media (min-width: 768px) {
  .layout-contact-form {
    grid-column: span 7;
  }
  .layout-contact-info {
    grid-column: span 5;
  }
}

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

.flex-group {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  flex-wrap: wrap;
}

.stack-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.text-center { text-align: center; }
.w-full { width: 100%; }

/* Screen Reader Utility (A11y) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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