/* =========================================
   Base / Design Tokens
   -----------------------------------------
   Minimal, document-style visual system.
   ========================================= */
:root {
  --bg: #ffffff;
  --text-primary: #111111;
  --text-secondary: #555555;
  --text-meta: #888888;
  --link: #2563eb;
  --max-width: 880px;
  --page-padding-desktop: 24px;
  --page-padding-mobile: 20px;
}

/* =========================================
   Global Reset (light-touch)
   ========================================= */
* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text-primary);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

/* =========================================
   Layout Wrapper
   -----------------------------------------
   Centered reading column with generous
   white space on desktop, tighter on mobile.
   ========================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px var(--page-padding-desktop) 96px;
}

/* =========================================
   Header / Navigation
   -----------------------------------------
   Quiet, text-only top navigation aligned
   to the right. It wraps naturally on small
   screens without changing structure.
   ========================================= */
.site-header {
  margin-bottom: 52px;
}

.site-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.site-name {
  color: var(--text-primary);
  font-size: 2.125rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-decoration: none;
}

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

.site-nav li {
  color: var(--text-meta);
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--text-secondary);
}

.site-nav a.active {
  color: var(--text-primary);
}

.site-nav li + li::before {
  content: " | ";
  color: var(--text-meta);
}

/* =========================================
   Typography
   ========================================= */
h1,
h2,
h3,
h4,
p,
ul,
ol {
  margin: 0;
}

h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

h2 {
  font-size: 1.375rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
}

h3 {
  font-size: 1.05rem;
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

p,
li {
  color: var(--text-secondary);
  font-size: 1rem;
}

p + p {
  margin-top: 18px;
}

.meta {
  color: var(--text-meta);
  font-size: 0.875rem;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
  outline: none;
}

/* =========================================
   Vertical Rhythm
   -----------------------------------------
   Documentation-like flow, no boxed blocks.
   ========================================= */
.section {
  margin-top: 60px;
}

.section:first-of-type {
  margin-top: 0;
}

.item {
  margin-top: 40px;
}

.item:first-of-type {
  margin-top: 0;
}

.inline-links {
  margin-top: 12px;
  font-size: 0.95rem;
}

.inline-links a + a {
  margin-left: 16px;
}

.case-block {
  margin-top: 18px;
}

.case-block strong {
  color: var(--text-primary);
  font-weight: 600;
}

.text-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.text-list li {
  margin-top: 14px;
}

.text-list li:first-of-type {
  margin-top: 0;
}

.site-footer {
  margin-top: 72px;
}

/* =========================================
   Responsive Tweaks
   -----------------------------------------
   Same structure, narrower reading space.
   ========================================= */
@media (max-width: 640px) {
  .container {
    padding: 24px var(--page-padding-mobile) 72px;
  }

  h1 {
    font-size: 1.75rem;
  }

  .site-name {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.375rem;
  }
}