:root {
  --ink: #1a2420;
  --ink-soft: #3d4a44;
  --mist: #e8f0ec;
  --foam: #f5faf7;
  --leaf: #2f6b57;
  --leaf-deep: #1e4a3c;
  --line: rgba(26, 36, 32, 0.12);
  --shadow: 0 18px 48px rgba(30, 74, 60, 0.08);
  --font-display: "Fraunces", "Hiragino Mincho ProN", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Sans", sans-serif;
  --max: 42rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.75;
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(47, 107, 87, 0.14), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(90, 130, 150, 0.12), transparent 50%),
    linear-gradient(180deg, var(--foam) 0%, var(--mist) 45%, #eef3f0 100%);
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: #fff;
  padding: 0.5rem 0.75rem;
  z-index: 10;
  border-radius: 0.35rem;
}

.skip-link:focus {
  top: 1rem;
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(3.5rem, 10vw, 6.5rem) 1.5rem 3rem;
  color: var(--foam);
  background:
    linear-gradient(145deg, #16352c 0%, #2a5c4a 48%, #3d6e7a 100%);
}

.hero__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 78% 22%, rgba(255, 255, 255, 0.16), transparent 42%),
    repeating-linear-gradient(
      -18deg,
      transparent 0,
      transparent 11px,
      rgba(255, 255, 255, 0.03) 11px,
      rgba(255, 255, 255, 0.03) 12px
    );
  z-index: -1;
  animation: veil-drift 18s ease-in-out infinite alternate;
}

@keyframes veil-drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-1.5%, 1%, 0) scale(1.03);
  }
}

.hero__inner {
  max-width: var(--max);
  margin: 0 auto;
}

.brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  font-weight: 650;
  letter-spacing: 0.02em;
  line-height: 1.05;
  animation: rise 0.9s ease both;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-family: var(--font-body);
  font-size: clamp(1.15rem, 2.8vw, 1.45rem);
  font-weight: 500;
  letter-spacing: 0.08em;
  opacity: 0.92;
  animation: rise 0.9s ease 0.08s both;
}

.lede {
  margin: 0;
  max-width: 34rem;
  font-size: 1.02rem;
  opacity: 0.9;
  animation: rise 0.9s ease 0.16s both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toc {
  max-width: var(--max);
  margin: -1.4rem auto 0;
  padding: 1.25rem 1.4rem;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  position: relative;
  z-index: 1;
}

.toc ol {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.35rem;
}

.toc a {
  color: var(--leaf-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.toc a:hover,
.toc a:focus-visible {
  color: var(--leaf);
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

section {
  padding: 1.75rem 0 2rem;
  border-top: 1px solid var(--line);
}

section:first-of-type {
  border-top: 0;
  padding-top: 0.5rem;
}

h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 3.5vw, 1.9rem);
  font-weight: 650;
  color: var(--leaf-deep);
  letter-spacing: 0.01em;
}

h3 {
  margin: 1.4rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
}

p,
.steps,
.bullets,
.dont-list {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.steps,
.bullets,
.dont-list {
  padding-left: 1.25rem;
}

.steps li,
.bullets li,
.dont-list li {
  margin-bottom: 0.45rem;
}

.steps ul {
  margin: 0.45rem 0 0.2rem;
  padding-left: 1.1rem;
}

.example,
.note {
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--leaf);
  background: rgba(255, 255, 255, 0.55);
}

.shot {
  margin: 1.25rem 0 1.6rem;
  padding: 0;
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  box-shadow: var(--shadow);
  background: #fff;
}

.shot figcaption {
  margin: 0.65rem 0 0;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.note {
  border-left-color: #5a8296;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  background: rgba(26, 36, 32, 0.06);
  padding: 0.08em 0.35em;
  border-radius: 0.25rem;
}

.dont-list li::marker {
  content: "× ";
  color: #8a3b3b;
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem 3.5rem;
  color: var(--ink-soft);
}

.site-footer .brand {
  font-size: 1.35rem;
  color: var(--leaf-deep);
  margin-bottom: 0.35rem;
}

.site-footer p {
  margin: 0;
  font-size: 0.92rem;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__veil,
  .brand,
  .hero h1,
  .lede {
    animation: none;
  }
}

@media (max-width: 640px) {
  .toc {
    margin-left: 1rem;
    margin-right: 1rem;
  }
}