/* ============================================================================
   CSS Reset & Box Sizing
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  text-rendering: optimizeSpeed;
}

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

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

ul[role="list"], ol[role="list"] {
  list-style: none;
}

/* ============================================================================
   CSS Variables - Credit River Editorial Ink
   ========================================================================= */

:root {
  --color-primary: #1E5B4F;
  --color-secondary: #2F3A56;
  --color-accent: #C46A2B;
  --color-background: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #1B1F24;
  --color-text-muted: #4E5A66;
  --color-border: #D7D0C4;
  
  --radius: 14px;
  --shadow: 0 10px 30px rgba(27, 31, 36, 0.10);
  --measure: 68ch;
  
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 4rem;
  
  --transition-base: 0.2s ease-in-out;
  --transition-long: 0.3s ease-in-out;
}

/* ============================================================================
   Base Typography - Editorial Style with Fluid Type
   ========================================================================= */

body {
  font-family: var(--font-system);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-secondary);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: clamp(2rem, 1.5rem + 2vw, 3rem);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);
  margin-top: var(--space-xl);
}

h3 {
  font-size: clamp(1.5rem, 1.25rem + 1vw, 2rem);
  margin-top: var(--space-lg);
}

h4 {
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  margin-top: var(--space-md);
}

h5, h6 {
  font-size: clamp(1.125rem, 1.05rem + 0.25vw, 1.25rem);
  margin-top: var(--space-md);
}

p {
  max-width: var(--measure);
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  transition: text-decoration-thickness var(--transition-base), color var(--transition-base);
}

a:hover {
  color: var(--color-accent);
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ============================================================================
   Main Layout - Editorial Grid
   ========================================================================= */

body {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header"
    "main"
    "footer";
  min-height: 100vh;
}

header {
  grid-area: header;
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: var(--space-md) var(--space-sm);
  box-shadow: var(--shadow);
}

main {
  grid-area: main;
  padding: var(--space-lg) var(--space-sm);
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

footer {
  grid-area: footer;
  background-color: var(--color-secondary);
  color: var(--color-surface);
  padding: var(--space-lg) var(--space-sm);
  margin-top: var(--space-xxl);
}

@media (min-width: 768px) {
  header {
    padding: var(--space-lg) var(--space-lg);
  }
  
  main {
    padding: var(--space-xl) var(--space-lg);
  }
  
  footer {
    padding: var(--space-xl) var(--space-lg);
  }
}

@media (min-width: 1024px) {
  body {
    grid-template-columns: minmax(200px, 250px) 1fr;
    grid-template-areas:
      "header header"
      "aside main"
      "footer footer";
  }
  
  aside {
    grid-area: aside;
    padding: var(--space-xl) var(--space-lg);
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
  }
}

/* ============================================================================
   Header & Navigation - Flexbox Clusters
   ========================================================================= */

header {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: flex-start;
}

.site-name {
  font-size: clamp(1.5rem, 1.3rem + 0.8vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-name:hover {
  color: var(--color-accent);
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-md);
  list-style: none;
}

nav a {
  color: var(--color-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-base), color var(--transition-base);
}

nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

nav a:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (min-width: 768px) {
  header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  
  nav ul {
    gap: var(--space-md) var(--space-lg);
  }
}

/* ============================================================================
   Breadcrumbs
   ========================================================================= */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  align-items: center;
  margin-bottom: var(--space-lg);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: "→";
  margin-left: var(--space-xs);
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base);
}

.breadcrumbs a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ============================================================================
   Content Sections
   ========================================================================= */

section {
  margin-bottom: var(--space-xxl);
}

section:last-child {
  margin-bottom: 0;
}

article {
  background-color: var(--color-surface);
  padding: var(--space-lg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: var(--space-xl);
}

aside {
  background-color: rgba(30, 91, 79, 0.05);
  border-left: 4px solid var(--color-primary);
  padding: var(--space-md);
  margin: var(--space-lg) 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

aside h3, aside h4 {
  font-size: 1.125rem;
  margin-top: 0;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

/* ============================================================================
   Blockquotes - Editorial Style
   ========================================================================= */

blockquote {
  background-color: rgba(196, 106, 43, 0.06);
  border-left: 5px solid var(--color-accent);
  padding: var(--space-md) var(--space-md) var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--color-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

blockquote p:last-child {
  margin-bottom: 0;
}

blockquote cite {
  display: block;
  margin-top: var(--space-sm);
  font-size: 0.9rem;
  font-style: normal;
  color: var(--color-text-muted);
}

blockquote cite::before {
  content: "— ";
}

/* ============================================================================
   Tables - Zebra Striping & Responsive
   ========================================================================= */

.table-wrapper {
  overflow-x: auto;
  margin: var(--space-lg) 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  font-size: 0.95rem;
}

caption {
  font-weight: 700;
  text-align: left;
  padding: var(--space-md);
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

thead {
  background-color: var(--color-secondary);
  color: var(--color-surface);
}

th {
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

tbody tr:nth-child(odd) {
  background-color: rgba(246, 242, 234, 0.5);
}

tbody tr:hover {
  background-color: rgba(30, 91, 79, 0.08);
  transition: background-color var(--transition-base);
}

@media (min-width: 768px) {
  thead {
    position: sticky;
    top: 0;
    z-index: 10;
  }
}

/* ============================================================================
   Details/Summary Accordions - Animated
   ========================================================================= */

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  box-shadow: 0 2px 8px rgba(27, 31, 36, 0.06);
}

summary {
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs);
  margin: calc(-1 * var(--space-xs));
  border-radius: calc(var(--radius) - 4px);
  transition: background-color var(--transition-base), color var(--transition-base);
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: "▶";
  display: inline-block;
  font-size: 0.75em;
  transition: transform var(--transition-base);
}

details[open] summary::before {
  transform: rotate(90deg);
}

summary:hover {
  background-color: rgba(30, 91, 79, 0.08);
  color: var(--color-accent);
}

summary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

details[open] summary {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

details .details-content {
  animation: slideDown var(--transition-long) ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================================
   Lists
   ========================================================================= */

ul:not([role="list"]):not([class]), 
ol:not([role="list"]):not([class]) {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
  max-width: var(--measure);
}

li {
  margin-bottom: var(--space-xs);
}

li::marker {
  color: var(--color-accent);
}

/* ============================================================================
   Footer - Flexbox Cluster
   ========================================================================= */

footer {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  text-align: center;
}

footer p {
  margin: 0;
  max-width: none;
  font-size: 0.9rem;
}

footer a {
  color: var(--color-surface);
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

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

@media (min-width: 768px) {
  footer {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ============================================================================
   Buttons & Form Elements
   ========================================================================= */

button, .button {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  background-color: var(--color-primary);
  color: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

button:hover, .button:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

button:focus-visible, .button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

button:active, .button:active {
  transform: translateY(0);
}

/* ============================================================================
   FAQ Specific Styles
   ========================================================================= */

.faq-item {
  margin-bottom: var(--space-xl);
}

.faq-item h3 {
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

/* ============================================================================
   Utility Classes
   ========================================================================= */

.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;
}

.skip-link {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background-color: var(--color-accent);
  color: var(--color-surface);
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform var(--transition-base);
  z-index: 9999;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ============================================================================
   Reduced Motion
   ========================================================================= */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  details[open] summary::before {
    transition: none;
  }
  
  @keyframes slideDown {
    from, to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* ============================================================================
   Print Styles
   ========================================================================= */

@media print {
  body {
    background-color: white;
    color: black;
    font-size: 12pt;
  }
  
  header, footer, nav, aside {
    display: none;
  }
  
  main {
    max-width: 100%;
    padding: 0;
  }
  
  a {
    text-decoration: underline;
    color: black;
  }
  
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.9em;
    color: #666;
  }
  
  article, section {
    page-break-inside: avoid;
  }
  
  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }
  
  img {
    max-width: 100% !important;
  }
  
  table {
    border-collapse: collapse;
  }
  
  th, td {
    border: 1px solid black;
    padding: 8px;
  }
  
  details summary::before {
    display: none;
  }
  
  details[open] {
    border: 1px solid #ccc;
  }
}