:root {
  --sea: #1d3a34;
  --kelp: #4a7c59;
  --salt: #f4f1e8;
  --ink: #14241f;
  --mute: #5c7268;
  --display: "Yeseva One", "Noto Sans SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 64px; }
body { margin: 0; background: var(--salt); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.75; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--kelp); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
label { display: block; font-size: 13px; color: var(--mute); margin: 8px 0; }
input[type="range"] { width: min(280px, 100%); accent-color: var(--kelp); }
.kelp-grain { pointer-events: none; position: fixed; inset: 0; z-index: 1; opacity: 0.16; background-image: url("images/texture.webp"); background-size: 280px auto; mix-blend-mode: multiply; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--kelp); color: #fff; padding: 8px; }
.yard-bar, .fence-bar { position: sticky; top: 0; z-index: 40; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 20px; background: var(--sea); color: var(--salt); }
.brand { font-family: var(--display); font-size: 22px; }
.brand small { display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em; color: #c5d8cc; font-weight: 400; }
.nav-toggle { display: none; background: var(--kelp); color: #fff; border: 0; padding: 6px 12px; font-weight: 700; }
.line-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; align-items: center; }
.line-links a { color: #d5e6dc; }
.line-links a.is-active, .line-links a:hover { color: #fff; }
.line-links .live { background: var(--kelp); color: #fff; padding: 6px 12px; font-weight: 700; }
.yard { position: relative; min-height: 88vh; display: flex; align-items: center; }
.yard > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.banner, .frond { position: relative; z-index: 2; margin-left: 6vw; max-width: 520px; background: rgba(244,241,232,0.94); padding: 22px; border-top: 8px solid var(--kelp); }
.kicker { font-family: var(--mono); letter-spacing: 0.14em; font-size: 11px; color: var(--kelp); margin: 0 0 10px; }
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.15; }
h1 { font-size: clamp(28px, 4vw, 44px); }
h2 { font-size: clamp(22px, 2.8vw, 32px); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn { display: inline-flex; align-items: center; padding: 10px 16px; font-size: 14px; font-weight: 700; background: var(--sea); color: var(--salt); }
.btn.line { background: transparent; border: 1px solid var(--sea); color: var(--sea); }
.w { width: min(1000px, calc(100% - 40px)); margin: 0 auto; padding: 64px 0; }
.ropes { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 16px; }
.ropes article { background: #fff; padding: 16px 16px 18px 20px; border-left: 6px dashed var(--kelp); }
.ropes ul { margin: 0; padding-left: 1.1em; }
.shot { margin-top: 22px; }
.shot img { width: 100%; height: 280px; object-fit: cover; }
.shot figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }
.mo-box { background: #fff; padding: 18px; max-width: 28em; margin: 16px 0; box-shadow: inset 0 0 0 4px var(--kelp); }
.mo-box.is-ok { box-shadow: inset 0 0 0 4px var(--sea); }
.n { font-family: var(--mono); font-size: 48px; margin: 0; color: var(--sea); line-height: 1; }
.n span { font-size: 16px; color: var(--mute); }
#flow, #value { background: #e4eee6; }
#kelp-toggle { margin-top: 8px; background: var(--kelp); color: #fff; border: 0; padding: 8px 14px; font-weight: 700; }
#rules ol { background: #fff; padding: 16px 16px 16px 36px; border-left: 8px solid var(--sea); max-width: 46em; }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #fff; padding: 16px; }
.url { margin-top: 18px; font-family: var(--mono); font-size: 13px; }
footer { padding: 16px 20px 40px; color: var(--mute); font-size: 13px; }
@media (max-width: 900px) {
  .yard { min-height: 72vh; }
  .banner { margin: 24px 16px; max-width: none; }
  .ropes, .io { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .yard-bar { flex-wrap: wrap; }
  .line-links { display: none; width: 100%; flex-direction: column; padding: 8px 0; }
  .line-links.open { display: flex; }
}