:root {
  --abyss: #01080d;
  --deep: #021820;
  --mid: #063447;
  --teal: #1a8f9e;
  --phosphor: #3de0c5;
  --foam: #7ee8d8;
  --ink: #e8fffa;
  --muted: #9bb8b2;
  --line: rgba(126, 232, 216, 0.18);
  --panel: rgba(6, 52, 71, 0.55);
  --danger: #ff7a6e;
  --font-display: "Avenir Next", "Segoe UI", "Trebuchet MS", sans-serif;
  --font-mono: "SF Mono", "Cascadia Mono", "Consolas", monospace;
  --font-body: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --radius: 14px;
  --max: 760px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  background: var(--abyss);
  position: relative;
}

.depth-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(61, 224, 197, 0.16), transparent 55%),
    linear-gradient(180deg, #063447 0%, #021820 38%, #01080d 100%);
  pointer-events: none;
}
.depth-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    180deg,
    transparent 0,
    transparent 47px,
    rgba(126, 232, 216, 0.03) 48px
  );
  mask-image: linear-gradient(180deg, transparent, #000 20%, #000 80%, transparent);
}

a { color: var(--phosphor); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--foam); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 980px;
  margin: 0 auto;
  padding: 1rem 1.25rem 0.5rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.brand-mark {
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 999px;
  border: 2px solid var(--phosphor);
  box-shadow: 0 0 0 5px rgba(61, 224, 197, 0.15);
  background: radial-gradient(circle at center, var(--phosphor) 0 28%, transparent 30%);
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}
.site-nav a {
  color: var(--foam);
  text-decoration: none;
  opacity: 0.85;
}
.site-nav a:hover { opacity: 1; }

.site-main { max-width: 980px; margin: 0 auto; padding: 0.5rem 1.25rem 3rem; }

.hero { margin-bottom: 2.5rem; }
.hero-kicker {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--foam);
}
.hero h1 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  letter-spacing: 0.06em;
  line-height: 1.1;
}
.hero-lead {
  margin: 0 0 1rem;
  max-width: 42rem;
  color: var(--muted);
}

.stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  min-height: 360px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
}
.cover,
.loader,
.stage iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.cover {
  display: grid;
  place-items: center;
  background: #021820;
  z-index: 2;
}
.cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.play-btn {
  position: relative;
  z-index: 2;
  appearance: none;
  border: 0;
  cursor: pointer;
  padding: 0.95rem 1.6rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #021820;
  background: linear-gradient(180deg, #7ee8d8, #3de0c5);
  box-shadow: 0 10px 30px rgba(61, 224, 197, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.play-btn:hover { transform: translateY(-1px); box-shadow: 0 14px 34px rgba(61, 224, 197, 0.45); }
.play-btn.compact { padding: 0.7rem 1.15rem; font-size: 0.95rem; }

.loader {
  display: none;
  place-items: center;
  align-content: center;
  gap: 1rem;
  background: radial-gradient(circle at 50% 40%, rgba(61, 224, 197, 0.18), #01080d 65%);
  color: var(--foam);
  font-family: var(--font-mono);
  z-index: 3;
}
.stage[data-gf-state="loading"] .loader:not([hidden]) { display: grid; }

/* Modern browsers let author display rules override [hidden]; keep engine hide working */
.cover[hidden],
.loader[hidden],
.stage[data-gf-state="loading"] .cover,
.stage[data-gf-state="playing"] .cover {
  display: none !important;
}

.sonar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 2px solid rgba(61, 224, 197, 0.35);
  position: relative;
  animation: pulse 1.4s ease-out infinite;
}
.sonar::before,
.sonar::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  border: 2px solid rgba(61, 224, 197, 0.45);
}
.sonar::after { inset: 36%; background: var(--phosphor); border: 0; }
@keyframes pulse {
  0% { transform: scale(0.92); opacity: 0.7; }
  70% { transform: scale(1.08); opacity: 1; }
  100% { transform: scale(0.92); opacity: 0.7; }
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.85rem;
  align-items: center;
}
.tool-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  cursor: pointer;
}
.tool-btn:hover { border-color: var(--phosphor); color: var(--foam); }
.tool-btn[aria-pressed="true"],
.tool-btn[data-gf-liked] {
  background: rgba(61, 224, 197, 0.18);
  border-color: var(--phosphor);
  color: var(--phosphor);
}
.share-msg { font-family: var(--font-mono); font-size: 0.78rem; color: var(--foam); }
.embed-note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.prose {
  max-width: var(--max);
  margin: 0 auto 2.4rem;
  padding-top: 0.5rem;
}
.prose h2 {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: 0.02em;
}
.prose p { margin: 0 0 1rem; color: #d5efe9; }
.shot {
  margin: 1.25rem 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
}
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption {
  padding: 0.7rem 0.9rem;
  font-size: 0.88rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.steps { margin: 0; padding: 0; list-style: none; counter-reset: dive; }
.steps li {
  position: relative;
  margin-bottom: 0.9rem;
  padding: 0.95rem 1rem 0.95rem 3.2rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(2, 24, 32, 0.55);
}
.steps li::before {
  counter-increment: dive;
  content: counter(dive);
  position: absolute;
  left: 0.85rem;
  top: 1rem;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #021820;
  background: var(--phosphor);
}
.steps strong { display: block; margin-bottom: 0.25rem; }
.steps p { margin: 0; color: var(--muted); }

.tier-table {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  margin: 1rem 0;
}
.tier-row {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr 0.9fr;
  gap: 0.5rem;
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.86rem;
}
.tier-row:first-child { border-top: 0; }
.tier-head {
  background: rgba(61, 224, 197, 0.08);
  color: var(--foam);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.72rem;
}

.tips { margin: 0; padding-left: 1.15rem; }
.tips li { margin-bottom: 0.55rem; color: #d5efe9; }

.faq-list { display: grid; gap: 0.55rem; }
.faq-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(2, 24, 32, 0.55);
  padding: 0.15rem 0.9rem;
}
.faq-item summary {
  cursor: pointer;
  padding: 0.85rem 0;
  font-weight: 600;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item[open] summary { color: var(--phosphor); }
.faq-item p { color: var(--muted); }

.engage {
  max-width: var(--max);
  margin: 0 auto 2rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(6, 52, 71, 0.28);
}
.engage h2 { margin-top: 0; font-family: var(--font-display); }
.engage-lead { color: var(--muted); }
.comment-form {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.comment-form label { display: grid; gap: 0.35rem; font-size: 0.9rem; }
.comment-form input,
.comment-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #01080d;
  color: var(--ink);
  padding: 0.7rem 0.8rem;
  font: inherit;
}
.reply-bar {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--foam);
}
.reply-bar:not(:has([data-gf-reply-to]:not(:empty))) { display: none; }
.comments[data-gf-empty] .comments-empty { display: block; }
.comments-empty { display: none; color: var(--muted); font-style: italic; }
.comment {
  border-top: 1px solid var(--line);
  padding: 0.9rem 0;
}
.comment header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.75rem;
  align-items: baseline;
  margin-bottom: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.comment time { color: var(--muted); }
.owner-tag { display: none; color: #021820; background: var(--phosphor); border-radius: 999px; padding: 0.1rem 0.45rem; }
.comment[data-gf-owner] .owner-tag,
[data-gf-c-owner]:not(:empty) { display: inline-block; }
.comment.reply { margin-left: 1rem; padding-left: 0.85rem; border-left: 2px solid rgba(61, 224, 197, 0.35); }
.comment button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--foam);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0;
}
.comment-count-line {
  margin: 0.5rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.page-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 0 2rem;
}
.page-wrap h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 1rem;
}
.page-wrap .body-html h2 { font-size: 1.25rem; margin-top: 1.6rem; }
.page-wrap .body-html p,
.page-wrap .body-html li { color: #d5efe9; }

.site-footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.footer-note { margin: 0.4rem 0 0.9rem; max-width: 36rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1.1rem; margin-bottom: 0.8rem; }
.footer-nav a { color: var(--foam); text-decoration: none; font-family: var(--font-mono); font-size: 0.8rem; }
.footer-copy { margin: 0; font-size: 0.85rem; }

@media (max-width: 640px) {
  .site-header { flex-direction: column; align-items: flex-start; }
  .stage { min-height: 280px; aspect-ratio: 4 / 5; }
  .tier-row { grid-template-columns: 1fr; }
  .comment.reply { margin-left: 0.4rem; }
}