:root {
  color-scheme: light dark;
  --paper: #faf3e9;
  --paper-deep: #f1e6d8;
  --card: rgba(255, 253, 249, 0.90);
  --ink: #292333;
  --ink-soft: #655e6e;
  --line: rgba(41, 35, 51, 0.14);
  --accent: #667eea;
  --accent-deep: #4559ba;
  --glow: #f4c982;
  --shadow: 0 24px 70px rgba(67, 48, 28, 0.10);
  --radius: 26px;
  --measure: 72ch;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 88% 8%, rgba(244, 201, 130, 0.42), transparent 24rem),
    linear-gradient(135deg, var(--paper) 0%, #fffaf3 48%, var(--paper-deep) 100%);
  color: var(--ink);
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  padding-right: env(safe-area-inset-right);
  padding-left: env(safe-area-inset-left);
}

body::before {
  position: fixed;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.28;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.045'/%3E%3C/svg%3E");
}

a {
  color: var(--accent-deep);
  text-underline-offset: 0.18em;
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(102, 126, 234, 0.22);
}
a:hover { color: var(--accent); }
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--glow);
  outline-offset: 4px;
  border-radius: 6px;
}

.skip {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  transform: translateY(-180%);
}
.skip:focus { transform: translateY(0); }

.shell {
  position: relative;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  min-height: 44px;
}

.companion-mark {
  position: relative;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(69, 89, 186, 0.24);
  border-radius: 48% 52% 54% 46%;
  background: linear-gradient(145deg, #8194f4, #5368d1);
  box-shadow: 0 7px 22px rgba(83, 104, 209, 0.28), inset 0 1px 0 rgba(255,255,255,.52);
  transform: rotate(-3deg);
}

.companion-mark::before,
.companion-mark::after {
  position: absolute;
  top: 15px;
  width: 4px;
  height: 5px;
  border-radius: 50%;
  background: #292333;
  content: "";
}
.companion-mark::before { left: 11px; }
.companion-mark::after { right: 11px; }

.site-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 2px;
  color: var(--ink-soft);
  font-size: 0.92rem;
  text-decoration: none;
}
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 700; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.42fr);
  gap: clamp(42px, 7vw, 96px);
  align-items: end;
  padding: clamp(64px, 9vw, 120px) 0 clamp(48px, 7vw, 82px);
}
.home-hero { align-items: center; }

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-deep);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1, h2, h3 {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  font-weight: 600;
  line-height: 1.1;
  text-wrap: balance;
}
h1 {
  max-width: 14ch;
  margin: 0;
  font-size: clamp(3rem, 7.2vw, 6.6rem);
  letter-spacing: -0.055em;
}
.home-hero h1 { max-width: 15ch; font-size: clamp(3rem, 6.6vw, 6.2rem); }

.hero-copy {
  max-width: 58ch;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.8vw, 1.28rem);
}

.note-card,
.content-card,
.quick-card {
  border: 1px solid rgba(41, 35, 51, 0.12);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.note-card {
  position: relative;
  padding: 28px;
  border-radius: 55% 45% 48% 52% / 40% 48% 52% 60%;
}
.note-card::before {
  position: absolute;
  top: -10px;
  right: 22px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--glow);
  box-shadow: 0 0 0 10px rgba(244, 201, 130, 0.22);
  content: "";
}
.note-card strong { display: block; margin-bottom: 8px; font-size: 1.02rem; }
.note-card p { margin: 0; color: var(--ink-soft); font-size: 0.92rem; }

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 64px;
}
.quick-card { min-height: 132px; padding: 22px; border-radius: 20px; }
.quick-card span {
  display: block;
  color: var(--accent-deep);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.quick-card strong {
  display: block;
  margin-top: 12px;
  font-family: "Iowan Old Style", Palatino, serif;
  font-size: 1.22rem;
  line-height: 1.18;
}

.content-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, var(--measure));
  gap: clamp(40px, 7vw, 100px);
  align-items: start;
  padding-bottom: 96px;
}
.home-layout { padding-top: 20px; }

.thread-nav { position: sticky; top: 24px; padding-left: 28px; }
.thread-nav::before {
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(var(--accent), var(--glow));
  content: "";
}
.thread-nav a {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 44px;
  margin: 0 0 4px;
  color: var(--ink-soft);
  font-size: 0.84rem;
  text-decoration: none;
}

section[id] { scroll-margin-top: 24px; }
.thread-nav a::before {
  position: absolute;
  top: 0.58em;
  left: -27px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  content: "";
}

.content-card { padding: clamp(28px, 5vw, 58px); border-radius: var(--radius); }
.content-card section + section { padding-top: 42px; border-top: 1px solid var(--line); margin-top: 42px; }
.content-card h2 { margin: 0 0 18px; font-size: clamp(1.65rem, 3vw, 2.35rem); letter-spacing: -0.025em; }
.content-card h3 { margin: 28px 0 10px; font-size: 1.25rem; }
.content-card p, .content-card li { color: var(--ink-soft); }
.content-card strong { color: var(--ink); }
.content-card ul, .content-card ol { padding-left: 1.2rem; }
.content-card li + li { margin-top: 10px; }

.steps { list-style: none; padding: 0 !important; counter-reset: step; }
.steps li {
  display: grid;
  grid-template-columns: minmax(10rem, .45fr) 1fr;
  gap: 18px;
  padding: 20px 0;
  counter-increment: step;
}
.steps li + li { border-top: 1px solid var(--line); }
.steps strong::before { content: "0" counter(step) " · "; color: var(--accent-deep); }
.steps span { color: var(--ink-soft); }

.callout {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 4px solid var(--accent);
  border-radius: 0 18px 18px 0;
  background: rgba(102, 126, 234, 0.09);
}
.callout p { margin: 0; color: var(--ink); }
.updated { margin-top: 26px; color: var(--ink-soft); font-size: 0.82rem; }

.action-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 18px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  text-decoration: none;
}
.button:hover { background: var(--accent-deep); color: #fff; }
.button.secondary { border: 1px solid var(--line); background: transparent; color: var(--ink); }
.button.secondary:hover { border-color: var(--accent); color: var(--accent-deep); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.84rem;
}
.site-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 1px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17131d;
    --paper-deep: #211a29;
    --card: rgba(38, 31, 47, 0.90);
    --ink: #f2edf6;
    --ink-soft: #c7becf;
    --line: rgba(242, 237, 246, 0.14);
    --accent: #91a2ff;
    --accent-deep: #b2bdff;
    --glow: #e7b96e;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  }
  body { background: radial-gradient(circle at 88% 8%, rgba(99, 79, 47, .5), transparent 24rem), linear-gradient(135deg, var(--paper), var(--paper-deep)); }
  .button { background: #f2edf6; color: #17131d; }
  .button:hover { background: #b2bdff; color: #17131d; }
}

@media (max-width: 820px) {
  .site-header { align-items: flex-start; }
  .hero { grid-template-columns: 1fr; }
  .note-card { max-width: 440px; border-radius: 24px; }
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
  .content-layout { grid-template-columns: 1fr; }
  .thread-nav { position: static; display: flex; flex-wrap: wrap; gap: 8px 16px; padding-left: 0; }
  .thread-nav::before, .thread-nav a::before { display: none; }
  .thread-nav a { margin: 0; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1180px); }
  .site-header { display: block; }
  .site-nav { margin-top: 18px; }
  .quick-grid { grid-template-columns: 1fr; }
  .quick-card { min-height: 0; }
  .steps li { grid-template-columns: 1fr; gap: 6px; }
  .site-footer { display: block; }
  .site-footer span { display: block; margin-top: 8px; }
}

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