/* ────────────────────────────────────────────
   Design Tokens
   ──────────────────────────────────────────── */
:root {
  /* ── Colors (dark) ── */
  --color-bg: #141210;
  --color-bg-subtle: #1c1a17;
  --color-text: #e8e4df;
  --color-text-secondary: #9e9790;
  --color-text-tertiary: #6b6560;
  --color-accent: #c4b5a4;
  --color-link: #e8e4df;
  --color-link-hover: #d4a574;
  --color-border: #2a2622;
  --color-dot: #6b6560;
  --color-selection: rgba(212, 165, 116, 0.2);
  /* ── Spacing ── */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;
  /* ── Typography ── */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-size-base: 1.05rem;
  --font-size-sm: 0.875rem;
  --font-size-xs: 0.75rem;
  --font-size-lg: 1.15rem;
  --font-size-name: 1.1rem;
  --font-size-section: 0.8rem;
  --line-height: 1.7;
  /* ── Layout ── */
  --max-width: 580px;
  --header-height: 3.5rem;
  /* ── Transitions ── */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 180ms;
  --duration-base: 320ms;
  --duration-slow: 500ms;
}
/* ────────────────────────────────────────────
   Reset & Base
   ──────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
::selection {
  background-color: var(--color-selection);
  color: inherit;
}
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition:
    background-color var(--duration-slow) var(--ease-out),
    color var(--duration-slow) var(--ease-out);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}
a:hover {
  color: var(--color-link-hover);
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}
ul {
  list-style: none;
}
/* ────────────────────────────────────────────
   Header
   ──────────────────────────────────────────── */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  transition: background-color var(--duration-slow) var(--ease-out);
}
/* Subtle frosted border at bottom */
#site-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(var(--max-width), calc(100% - 3rem));
  height: 1px;
  background: var(--color-border);
  transition: background var(--duration-slow) var(--ease-out);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-name {
  font-size: var(--font-size-name);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.site-name:hover {
  color: var(--color-text);
  opacity: 0.7;
}
.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 400;
  letter-spacing: 0.01em;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-link-hover);
  transition: width var(--duration-base) var(--ease-out);
}
.nav-link:hover {
  color: var(--color-text);
}
.nav-link:hover::after {
  width: 100%;
}
/* ────────────────────────────────────────────
   Main Content
   ──────────────────────────────────────────── */
#main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) 1.5rem var(--space-2xl);
  width: 100%;
  flex: 1;
}
/* ── Intro ── */
.intro {
  margin-bottom: var(--space-xl);
}
.intro-text {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.65;
  font-weight: 300;
  color: var(--color-text);
  letter-spacing: 0.005em;
}
.intro-period {
  display: none;
}
.intro-ellipsis {
  color: var(--color-text-tertiary);
}
.intro-expanded {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition:
    max-height var(--duration-slow) var(--ease-out),
    opacity var(--duration-base) var(--ease-out),
    margin var(--duration-slow) var(--ease-out);
  margin-top: 0;
}
.intro-expanded.is-open {
  max-height: 500px;
  opacity: 1;
  margin-top: var(--space-md);
}
.intro-expanded p {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  font-weight: 300;
}
.intro-expanded p:last-child {
  margin-bottom: 0;
}
.intro-toggle {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  padding: var(--space-xs) 0;
  margin-top: var(--space-xs);
  letter-spacing: 0.03em;
  text-transform: lowercase;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}
.intro-toggle::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-text-tertiary);
  opacity: 0.4;
  transition: opacity var(--duration-fast) var(--ease-out);
}
.intro-toggle:hover {
  color: var(--color-text-secondary);
}
.intro-toggle:hover::after {
  opacity: 0.8;
}
/* ── Content Sections ── */
.content-section {
  margin-bottom: var(--space-lg);
}
.section-title {
  font-size: var(--font-size-section);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
}
.content-list {
  border-top: 1px solid var(--color-border);
  transition: border-color var(--duration-slow) var(--ease-out);
}
.content-item {
  border-bottom: 1px solid var(--color-border);
  transition:
    border-color var(--duration-slow) var(--ease-out),
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  /* Scroll reveal */
  opacity: 0;
  transform: translateY(8px);
}
.content-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.content-item:hover {
  background-color: var(--color-bg-subtle);
}
.content-link {
  display: block;
  padding: 0.8rem 0.5rem;
  font-size: var(--font-size-base);
  font-weight: 400;
  flex: 1;
  transition:
    color var(--duration-fast) var(--ease-out),
    padding-left var(--duration-base) var(--ease-out);
}
.content-item:hover .content-link {
  padding-left: 0.85rem;
  color: var(--color-link-hover);
}
.content-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
  padding-right: 0.5rem;
  font-variant-numeric: tabular-nums;
}
/* ── Dot bullet via pseudo ── */
.content-item::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-dot);
  flex-shrink: 0;
  margin-left: 0.5rem;
  margin-right: 0;
  transition:
    background var(--duration-fast) var(--ease-out),
    transform var(--duration-base) var(--ease-spring);
}
.content-item:hover::before {
  background: var(--color-link-hover);
  transform: scale(1.6);
}
/* ────────────────────────────────────────────
   Footer
   ──────────────────────────────────────────── */
#site-footer {
  margin-top: auto;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) 1.5rem;
  border-top: 1px solid var(--color-border);
  transition: border-color var(--duration-slow) var(--ease-out);
}
.footer-text {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  letter-spacing: 0.05em;
}
/* ────────────────────────────────────────────
   Responsive
   ──────────────────────────────────────────── */
@media (max-width: 600px) {
  :root {
    --font-size-base: 1rem;
    --space-xl: 3.5rem;
    --space-2xl: 5rem;
  }
  .intro-text {
    font-size: 1.2rem;
  }
  .header-inner {
    padding: 0 1.25rem;
  }
  #main-content {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  .content-link {
    font-size: var(--font-size-sm);
  }
}
/* ────────────────────────────────────────────
   Reduced Motion
   ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .content-item {
    opacity: 1;
    transform: none;
  }
  html {
    scroll-behavior: auto;
  }
}