/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --color-bg: #F6F3EE;
  --color-surface: #FFFFFF;
  --color-text: #14161A;
  --color-muted: #4B5563;
  --color-border: #D6D2C9;
  --color-primary: #1F3A5F;
  --color-secondary: #2E6F6D;
  --color-accent: #C86B3C;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Courier New", Courier, monospace;
  --radius: 2px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* ===========================
   Reset and Base Styles
   =========================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

/* ===========================
   Typography
   =========================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin-top: 2rem;
  margin-bottom: 0.875rem;
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

p, ul, ol, table, details {
  margin-bottom: 1rem;
}

ul, ol {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

a {
  color: var(--color-secondary);
  text-decoration: underline;
  transition: color 0.2s ease;
}

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

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

strong {
  font-weight: 600;
}

/* ===========================
   Layout: Grid + Flexbox
   =========================== */
.container {
  width: 100%;
  max-width: 90rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: 3rem;
    padding-right: 3rem;
  }
}

main {
  min-height: 60vh;
  padding-top: 2rem;
  padding-bottom: 3rem;
}

article {
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}

section {
  margin-bottom: 2.5rem;
}

/* ===========================
   Header and Navigation
   =========================== */
header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-top: 1rem;
  padding-bottom: 1rem;
  box-shadow: var(--shadow);
}

header .container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.site-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  transition: color 0.2s ease;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--color-accent);
}

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

/* ===========================
   Breadcrumbs
   =========================== */
.breadcrumbs {
  padding-top: 1rem;
  padding-bottom: 0.5rem;
}

.breadcrumbs ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-border);
}

.breadcrumbs a {
  color: var(--color-secondary);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

/* ===========================
   Tables
   =========================== */
table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

caption {
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  background-color: var(--color-primary);
  color: var(--color-surface);
  font-size: 1rem;
}

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

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

th, td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

th {
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

tbody tr:hover {
  background-color: rgba(31, 58, 95, 0.05);
}

/* ===========================
   Details / Summary (Accordion)
   =========================== */
details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}

summary {
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s ease;
}

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

summary::before {
  content: "▸";
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--color-accent);
  font-size: 1.125rem;
}

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

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

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

.faq-answer {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text);
}

/* ===========================
   Aside and Blockquote
   =========================== */
aside {
  background-color: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

aside h3 {
  margin-top: 0;
  font-size: 1.125rem;
  color: var(--color-primary);
}

blockquote {
  background-color: rgba(46, 111, 109, 0.05);
  border-left: 4px solid var(--color-secondary);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--color-muted);
}

/* ===========================
   Footer
   =========================== */
footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  margin-top: 3rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* ===========================
   Utility Classes
   =========================== */
.intro {
  font-size: 1.125rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

/* ===========================
   Accessibility: Reduced Motion
   =========================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===========================
   Focus Visible (Enhanced)
   =========================== */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius);
}

/* ===========================
   Responsive Adjustments
   =========================== */
@media (min-width: 768px) {
  body {
    font-size: 1.0625rem;
  }

  h1 {
    margin-bottom: 1.25rem;
  }

  section {
    margin-bottom: 3rem;
  }
}

@media (min-width: 1024px) {
  main {
    padding-top: 3rem;
    padding-bottom: 4rem;
  }
}