/* =========================================
   CSS RESET & ROOT VARIABLES
   ========================================= */

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

:root {
  --color-primary: #1F4E5F;
  --color-secondary: #2E7D6B;
  --color-accent: #D98E2B;
  --color-background: #F6F3EE;
  --color-surface: #FFFFFF;
  --color-text: #1B1F23;
  --color-text-muted: #4F5B62;
  --color-border: #D7D0C6;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(27, 31, 35, 0.10);
  --maxw: 1100px;
  --transition-speed: 0.25s;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  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
   ========================================= */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-primary);
  margin-bottom: 1rem;
  max-width: 42em;
}

h1 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  margin-bottom: 1.5rem;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--color-secondary);
}

p,
ul,
ol {
  margin-bottom: 1.25rem;
  max-width: 68ch;
}

ul,
ol {
  padding-left: 1.75rem;
}

li {
  margin-bottom: 0.5rem;
}

strong {
  font-weight: 600;
  color: var(--color-text);
}

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

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

a:hover {
  color: var(--color-accent);
  text-underline-offset: 0.25em;
}

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

/* =========================================
   SKIP LINK
   ========================================= */

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* =========================================
   HEADER
   ========================================= */

header {
  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: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 768px) {
  header .header-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

header .site-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  text-underline-offset: initial;
}

header .site-name:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

nav li {
  margin: 0;
}

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

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

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

/* =========================================
   BREADCRUMBS
   ========================================= */

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

nav[aria-label="Breadcrumb"] ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

nav[aria-label="Breadcrumb"] li {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

nav[aria-label="Breadcrumb"] li + li::before {
  content: "/";
  color: var(--color-border);
}

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

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

/* =========================================
   MAIN CONTENT
   ========================================= */

main {
  max-width: var(--maxw);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

@media (min-width: 768px) {
  main {
    padding: 3.5rem 2rem;
  }
}

@media (min-width: 1024px) {
  main {
    padding: 4rem 2.5rem;
  }
}

article,
section {
  margin-bottom: 3rem;
}

section:last-of-type {
  margin-bottom: 2rem;
}

/* =========================================
   BLOCKQUOTES
   ========================================= */

blockquote {
  margin: 2rem 0;
  padding: 1.5rem 1.5rem 1.5rem 2rem;
  background-color: var(--color-surface);
  border-left: 5px solid var(--color-accent);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(27, 31, 35, 0.06);
  font-style: italic;
  color: var(--color-text-muted);
  max-width: 65ch;
}

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

/* =========================================
   TABLES
   ========================================= */

.table-container {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background-color: var(--color-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  background-color: var(--color-surface);
}

caption {
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--color-primary);
  text-align: left;
  padding: 1.25rem 1.25rem 1rem;
  caption-side: top;
}

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

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

th {
  padding: 1rem 1.25rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-secondary);
}

td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

tbody tr {
  transition: background-color var(--transition-speed) ease;
}

tbody tr:nth-child(even) {
  background-color: var(--color-background);
}

tbody tr:hover {
  background-color: rgba(31, 78, 95, 0.05);
}

@media (max-width: 767px) {
  table {
    font-size: 0.875rem;
  }
  
  th,
  td {
    padding: 0.75rem 0.875rem;
  }
}

/* =========================================
   DETAILS / SUMMARY (ACCORDION)
   ========================================= */

details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(27, 31, 35, 0.05);
  transition: box-shadow var(--transition-speed) ease;
}

details:hover {
  box-shadow: 0 4px 12px rgba(27, 31, 35, 0.08);
}

details[open] {
  border-color: var(--color-primary);
}

summary {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

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

summary::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  transition: transform var(--transition-speed) ease;
  flex-shrink: 0;
  margin-left: 1rem;
}

details[open] summary::after {
  transform: rotate(45deg);
}

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

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

details .details-content {
  padding: 0 1.5rem 1.5rem;
  color: var(--color-text);
  animation: fadeIn var(--transition-speed) ease;
}

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

@media (prefers-reduced-motion: reduce) {
  @keyframes fadeIn {
    from {
      opacity: 1;
      transform: none;
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

details .details-content p:last-child {
  margin-bottom: 0;
}

/* =========================================
   FOOTER
   ========================================= */

footer {
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: 2rem 1.5rem;
  text-align: center;
  border-top: 3px solid var(--color-secondary);
  margin-top: auto;
}

footer p {
  margin: 0;
  font-size: 0.9375rem;
  max-width: none;
}

footer a {
  color: var(--color-surface);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  transition: color var(--transition-speed) ease;
}

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

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

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

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

/* =========================================
   FOCUS STATES (GLOBAL)
   ========================================= */

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

button:focus-visible,
select:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* =========================================
   PRINT STYLES
   ========================================= */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  a,
  a:visited {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }

  abbr[title]::after {
    content: " (" attr(title) ")";
  }

  thead {
    display: table-header-group;
  }

  tr,
  img {
    page-break-inside: avoid;
  }

  p,
  h2,
  h3 {
    orphans: 3;
    widows: 3;
  }

  h2,
  h3 {
    page-break-after: avoid;
  }

  header,
  footer,
  nav {
    display: none;
  }
}

/* =========================================
   RESPONSIVE BREAKPOINTS
   ========================================= */

@media (min-width: 768px) {
  body {
    font-size: 1.125rem;
  }

  main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    margin-bottom: 2rem;
  }

  h2 {
    margin-top: 3rem;
  }

  section {
    margin-bottom: 4rem;
  }
}