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

:root {
  --color-primary: #2A3B5F;
  --color-secondary: #6B2D3A;
  --color-accent: #D08A2E;
  --color-background: #F6F2EA;
  --color-surface: #FFFFFF;
  --color-text: #14161A;
  --color-text-muted: #4B5563;
  --color-border: #D7D0C6;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 22, 26, 0.10);
  --measure: 68ch;
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --transition-speed: 0.25s;
}

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

body {
  font-family: var(--font-system);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 100%;
}

/* Typography Scale with clamp() */
h1 {
  font-size: clamp(1.875rem, 4vw + 1rem, 3rem);
  line-height: 1.1;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
  font-family: var(--font-serif);
}

h2 {
  font-size: clamp(1.5rem, 3vw + 0.75rem, 2.25rem);
  line-height: 1.2;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 2rem;
  margin-bottom: 0.875rem;
}

h3 {
  font-size: clamp(1.25rem, 2vw + 0.5rem, 1.75rem);
  line-height: 1.3;
  font-weight: 600;
  color: var(--color-secondary);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

h4 {
  font-size: clamp(1.125rem, 1.5vw + 0.5rem, 1.375rem);
  line-height: 1.4;
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.625rem;
}

p {
  max-width: var(--measure);
  margin-bottom: 1rem;
}

/* Header */
header[role="banner"] {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

header .site-name {
  font-size: clamp(1.25rem, 2.5vw + 0.5rem, 1.75rem);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  font-family: var(--font-serif);
  letter-spacing: -0.02em;
}

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

/* Navigation */
nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: center;
}

nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: calc(var(--radius) / 2);
  transition: background-color var(--transition-speed), color var(--transition-speed);
  display: inline-block;
}

nav a:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
}

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

/* Main Content Area */
main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  width: 100%;
}

article {
  background-color: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

section {
  margin-bottom: 2.5rem;
}

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

/* Links */
a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--transition-speed), text-decoration-color var(--transition-speed);
}

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;
}

/* Breadcrumbs */
nav[aria-label="Breadcrumb"] {
  margin-bottom: 1.5rem;
}

nav[aria-label="Breadcrumb"] ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.9375rem;
}

nav[aria-label="Breadcrumb"] li:not(:last-child)::after {
  content: "›";
  margin-left: 0.5rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

nav[aria-label="Breadcrumb"] a {
  color: var(--color-text-muted);
  text-decoration: none;
}

nav[aria-label="Breadcrumb"] a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

nav[aria-label="Breadcrumb"] [aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(20, 22, 26, 0.08);
  font-size: 0.9375rem;
}

caption {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-primary);
  text-align: left;
  padding: 1rem;
  background-color: var(--color-surface);
  caption-side: top;
}

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

th {
  text-align: left;
  padding: 1rem;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

tbody tr:nth-child(odd) {
  background-color: rgba(42, 59, 95, 0.03);
}

tbody tr:hover {
  background-color: rgba(208, 138, 46, 0.08);
  transition: background-color var(--transition-speed);
}

@media (max-width: 767px) {
  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  th,
  td {
    padding: 0.75rem;
    font-size: 0.875rem;
  }
}

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

/* Details/Summary Accordion */
details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 6px rgba(20, 22, 26, 0.06);
}

summary {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  transition: color var(--transition-speed);
  user-select: none;
}

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

summary::before {
  content: "▸";
  font-size: 1.25rem;
  color: var(--color-accent);
  transition: transform var(--transition-speed);
  display: inline-block;
  flex-shrink: 0;
}

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

summary:hover {
  color: var(--color-secondary);
}

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

details[open] summary {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

details > *:not(summary) {
  animation: slideDown var(--transition-speed) ease-out;
}

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

@media (prefers-reduced-motion: reduce) {
  summary::before {
    transition: none;
  }
  
  details > *:not(summary) {
    animation: none;
  }
}

/* Blockquotes */
blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  background-color: rgba(208, 138, 46, 0.06);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-text);
  position: relative;
}

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

blockquote::before {
  content: """;
  font-size: 3rem;
  color: var(--color-accent);
  opacity: 0.3;
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  font-family: var(--font-serif);
  line-height: 1;
}

blockquote cite {
  display: block;
  margin-top: 0.75rem;
  font-style: normal;
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
}

/* Aside */
aside {
  background-color: rgba(42, 59, 95, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
}

aside h3,
aside h4 {
  margin-top: 0;
  color: var(--color-secondary);
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-top: 3px solid var(--color-accent);
  margin-top: auto;
}

footer .footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

footer p {
  margin: 0;
  font-size: 0.9375rem;
}

footer a {
  color: var(--color-surface);
  text-decoration: underline;
}

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

footer nav ul {
  gap: 1rem;
}

footer nav a {
  color: var(--color-surface);
  padding: 0.25rem 0.5rem;
}

footer nav a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-accent);
}

/* Buttons & CTAs */
button,
.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--color-secondary);
  color: var(--color-surface);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-speed), transform var(--transition-speed);
  font-family: var(--font-system);
}

button:hover,
.button:hover {
  background-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);
}

/* Responsive Grid Layout */
@media (min-width: 768px) {
  main {
    padding: 3rem 2rem;
  }
  
  article {
    padding: 2.5rem;
  }
  
  .two-column-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
  }
}

@media (min-width: 1024px) {
  main {
    padding: 4rem 2.5rem;
  }
  
  article {
    padding: 3rem;
  }
  
  .three-column-layout {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
}

/* 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;
}

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

.text-muted {
  color: var(--color-text-muted);
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 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;
  }
  
  button:hover,
  .button:hover {
    transform: none;
  }
}

/* Print Styles */
@media print {
  body {
    background-color: white;
    color: black;
  }
  
  header,
  footer,
  nav,
  aside {
    display: none;
  }
  
  main {
    max-width: 100%;
    padding: 0;
  }
  
  article {
    box-shadow: none;
    padding: 0;
  }
  
  a {
    text-decoration: underline;
    color: black;
  }
  
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.875rem;
  }
  
  details {
    border: 1px solid black;
  }
  
  details summary::before {
    content: "";
  }
  
  details[open] summary {
    border-bottom: 1px solid black;
  }
  
  table {
    page-break-inside: avoid;
  }
  
  h1, h2, h3, h4 {
    page-break-after: avoid;
  }
}