/* ─── CSS Custom Properties ─── */
:root {
  --color-bg: #fbf7f2;
  --color-surface: #ffffff;
  --color-text: #2c1a0e;
  --color-text-muted: #7a5c4a;
  --color-accent: #c05428;
  --color-accent-hover: #a3451f;
  --color-border: #ede3d8;
  --color-nav-bg: #8b3a1a;
  --color-nav-text: #fbf7f2;
  --color-nav-highlight: #0f0704;
  --color-heading: #5c2e0e;
  --color-hero-overlay: rgba(44, 18, 5, 0.55);

  --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-body: 'Outfit', system-ui, -apple-system, sans-serif;
  --max-width: 1080px;
  --nav-height: 68px;
}

[data-theme="dark"] {
  --color-bg: #1e1a18;
  --color-surface: #2a2523;
  --color-text: #f5ece0;
  --color-text-muted: #b08060;
  --color-accent: #e06838;
  --color-accent-hover: #f07a4a;
  --color-border: #3d200e;
  --color-nav-bg: #0f0704;
  --color-nav-text: #f5ece0;
  --color-nav-highlight: #e06838;
  --color-heading: #f5ece0;
  --color-hero-overlay: rgba(0, 0, 0, 0.65);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  transition: background-color 0.2s ease, color 0.2s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-heading);
  line-height: 1.25;
  margin-bottom: 0.5em;
}

h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.4rem); }

p {
  margin-bottom: 1.2rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

li {
  margin-bottom: 0.4rem;
}

/* ─── Container ─── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── Navigation ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-nav-bg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-nav-text);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-brand:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-logo {
  height: 48px;
  width: auto;
  border-radius: 3px;
  border: 3.5px solid #ffffff;
  padding: 0px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  color: var(--color-nav-text);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-nav-highlight);
  background-color: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 6px;
  color: var(--color-nav-text);
  cursor: pointer;
  padding: 0.4rem 0.5rem;
  line-height: 1;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.theme-toggle:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background-color: rgba(255, 255, 255, 0.08);
}

.icon-sun { display: none; }
.icon-moon { display: flex; }

[data-theme="dark"] .icon-sun { display: flex; }
[data-theme="dark"] .icon-moon { display: none; }

/* Hamburger */
.nav-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 6px;
  color: var(--color-nav-text);
  cursor: pointer;
  padding: 0.4rem 0.5rem;
  line-height: 1;
}

/* ─── Mobile Nav ─── */
@media (max-width: 680px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-nav-bg);
    padding: 0.75rem;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
    gap: 0.2rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 0.65rem 1rem;
  }
}

/* ─── Hero ─── */
.hero {
  position: relative;
  min-height: 65vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-color: var(--color-nav-bg);
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: var(--color-hero-overlay);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 2rem 1.5rem;
  max-width: 720px;
}

.hero-content h1 {
  color: #ffffff;
  font-size: clamp(2.2rem, 7vw, 3.8rem);
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.45);
  margin-bottom: 0.75rem;
}

.hero-content p {
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  margin-bottom: 1.75rem;
}

.hero-btn {
  display: inline-block;
  padding: 0.75rem 2.25rem;
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.85rem;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.hero-btn:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-1px);
}

/* ─── Content Sections ─── */
.section {
  padding: 4rem 0;
}

/* ─── Page Content (inner pages) ─── */
.page-content {
  padding: 3rem 0 4.5rem;
}

.page-content h1 {
  margin-bottom: 0.4rem;
}

.page-divider {
  width: 3.5rem;
  height: 3px;
  background-color: var(--color-accent);
  border: none;
  border-radius: 2px;
  margin: 0 0 2.5rem;
}

.page-body {
  max-width: 760px;
}

.page-body h2 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.page-body h2:first-child {
  margin-top: 0;
}

.page-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  text-align: left;
}

.page-body th,
.page-body td {
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--color-accent);
  text-align: left;
  vertical-align: top;
}

.page-body thead th {
  font-weight: 600;
  background-color: rgba(192, 84, 40, 0.08);
}

/* ─── Page Layout (content + TOC) ─── */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 3rem;
  align-items: start;
}

/* ─── TOC ─── */
.page-toc {
  position: sticky;
  top: calc(var(--nav-height) + 1.5rem);
}

.toc-inner {
  border-left: 2px solid var(--color-accent);
  padding-left: 1rem;
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

.page-toc nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-toc nav ul ul {
  padding-left: 0.85rem;
  margin-top: 0.2rem;
}

.page-toc nav li {
  margin-bottom: 0.3rem;
}

.page-toc nav a {
  font-size: 0.83rem;
  color: var(--color-text-muted);
  text-decoration: none;
  line-height: 1.4;
  display: block;
  transition: color 0.15s ease;
}

.page-toc nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

@media (max-width: 860px) {
  .page-layout {
    grid-template-columns: 1fr;
  }

  .page-toc {
    display: none;
  }
}

/* ─── Footer ─── */
.site-footer {
  background-color: var(--color-nav-bg);
  color: var(--color-nav-text);
  padding: 1.25rem 0;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--color-nav-text);
}

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

.footer-nav a {
  color: rgba(249, 245, 236, 0.65);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.15s ease;
}

.footer-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.footer-copy {
  width: 100%;
  text-align: center;
  font-size: 0.78rem;
  color: rgba(249, 245, 236, 0.35);
  margin-top: 0.4rem;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

@media (max-width: 500px) {
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}