:root {
  --bg: #06080b;
  --bg-2: #0a0d12;
  --line: rgba(160, 190, 220, .12);
  --line-2: rgba(160, 190, 220, .22);
  --text: #e4e9ef;
  --muted: #8592a1;
  --dim: #56626f;
  --accent: #7fe3d4;
  --accent-2: #8aa7ff;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --r: 14px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
::selection { background: rgba(127, 227, 212, .25); }

.wrap { width: min(1140px, 100% - 48px); margin-inline: auto; }
.mono { font-family: var(--mono); font-size: 12.5px; color: var(--muted); letter-spacing: .02em; }

/* ---------- background ---------- */
.bg-grid {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 500px at 78% -5%, rgba(138, 167, 255, .09), transparent 70%),
    radial-gradient(700px 500px at 5% 40%, rgba(127, 227, 212, .05), transparent 70%),
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 88px 88px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 88px 88px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, #000 20%, transparent 78%);
          mask-image: radial-gradient(ellipse at 50% 30%, #000 20%, transparent 78%);
  opacity: .55;
}

.progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 60; }
.progress i {
  display: block; height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transform-origin: 0 50%; transform: scaleX(var(--p, 0));
}

/* ---------- nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 14px max(24px, calc((100% - 1140px) / 2));
  transition: background .4s, border-color .4s, backdrop-filter .4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(6, 8, 11, .72);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-color: var(--line);
}
.logo { display: inline-flex; align-items: center; gap: 10px; font: 500 15px var(--mono); letter-spacing: .14em; }
.nav-links { display: flex; gap: 34px; }
.nav-links a { font-size: 14px; color: var(--muted); position: relative; padding: 4px 0; transition: color .25s; }
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: var(--accent); transform: scaleX(0); transform-origin: 0 50%; transition: transform .35s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { transform: scaleX(1); }

/* ---------- buttons ---------- */
.btn {
  --h: 48px;
  display: inline-flex; align-items: center; gap: 10px; height: var(--h); padding: 0 22px;
  border-radius: 999px; font: 500 14.5px var(--sans); border: 1px solid var(--line-2);
  transition: transform .3s var(--ease), border-color .3s, background .3s, box-shadow .3s, color .3s;
  cursor: pointer; white-space: nowrap;
}
.btn .arr { transition: transform .3s var(--ease); }
.btn:hover .arr { transform: translateX(4px); }
.btn-sm { --h: 38px; padding: 0 16px; font-size: 13.5px; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.btn-status { gap: 9px; color: var(--muted); }
.btn-status:hover { color: var(--text); }
.btn-ghost { background: rgba(255, 255, 255, .02); }
.btn-ghost:hover { border-color: var(--accent); background: rgba(127, 227, 212, .06); }
.btn-primary { background: var(--text); color: #05070a; border-color: transparent; }
.btn-primary:hover { box-shadow: 0 0 0 6px rgba(127, 227, 212, .12), 0 8px 40px rgba(127, 227, 212, .25); transform: translateY(-1px); }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; padding: 120px 0 90px; overflow: hidden; }
#orbit { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero-vignette {
  position: absolute; inset: 0; pointer-events: none;
  background:
    linear-gradient(90deg, rgba(6, 8, 11, .8) 0%, rgba(6, 8, 11, .45) 38%, transparent 70%),
    linear-gradient(0deg, var(--bg), transparent 22%);
}
.hero-inner { position: relative; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 400 12.5px var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--muted);
  padding: 7px 14px 7px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255, 255, 255, .02);
}
.dot, .pulse { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; position: relative; }
.dot::after, .pulse::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%; background: var(--accent);
  animation: ping 2.6s ease-out infinite;
}
@keyframes ping { 0% { transform: scale(1); opacity: .7; } 80%, 100% { transform: scale(3.4); opacity: 0; } }

h1 {
  margin: 26px 0 24px; font-weight: 300; letter-spacing: -.035em;
  font-size: clamp(42px, 7.2vw, 92px); line-height: 1.02; max-width: 12em;
}
.glow {
  font-weight: 500;
  background: linear-gradient(100deg, var(--accent-2), var(--accent) 45%, var(--accent-2) 90%);
  background-size: 220% 100%; -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: shimmer 9s ease-in-out infinite alternate;
}
@keyframes shimmer { to { background-position: 100% 0; } }
.lead { max-width: 33em; color: var(--muted); font-size: clamp(16px, 1.5vw, 19px); font-weight: 300; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.stack { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 56px; }
.stack li { font: 400 12.5px var(--mono); color: var(--dim); letter-spacing: .05em; position: relative; }
.stack li + li::before { content: "/"; position: absolute; left: -14px; color: var(--line-2); }

.hud {
  position: absolute; left: max(24px, calc((100% - 1140px) / 2)); right: max(24px, calc((100% - 1140px) / 2)); bottom: 26px;
  display: flex; justify-content: space-between; font: 400 11.5px var(--mono); letter-spacing: .12em; color: var(--dim);
}
.hud .pulse { margin-right: 8px; }
.scroll-hint {
  position: absolute; left: 50%; bottom: 20px; width: 22px; height: 36px; margin-left: -11px;
  border: 1px solid var(--line-2); border-radius: 12px; opacity: .8;
}
.scroll-hint i { position: absolute; left: 50%; top: 7px; width: 2px; height: 6px; margin-left: -1px; background: var(--accent); border-radius: 2px; animation: wheel 2.2s var(--ease) infinite; }
@keyframes wheel { 0% { transform: translateY(0); opacity: 1; } 70%, 100% { transform: translateY(13px); opacity: 0; } }

/* ---------- sections ---------- */
.section { padding: clamp(80px, 12vw, 150px) 0; position: relative; }
.sec-head { max-width: 640px; margin-bottom: 56px; }
.tag { font: 400 12.5px var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
h2 { font-weight: 300; font-size: clamp(32px, 4.6vw, 56px); line-height: 1.08; letter-spacing: -.03em; }
.sub { margin-top: 20px; color: var(--muted); font-weight: 300; font-size: 17px; max-width: 34em; }
.sec-head .btn { margin-top: 28px; }

/* services explorer */
.sx { display: grid; grid-template-columns: 300px 1fr; gap: 20px; align-items: stretch; }
.sx-tabs { display: flex; flex-direction: column; gap: 8px; }
.sx-tab {
  --p: 0;
  position: relative; display: grid; grid-template-columns: 40px 1fr; grid-template-rows: auto auto; column-gap: 14px; align-items: center;
  text-align: left; padding: 14px 16px; border-radius: 12px; border: 1px solid transparent; background: transparent; color: var(--muted);
  font: inherit; cursor: pointer; overflow: hidden; transition: background .35s, border-color .35s, color .35s;
}
.sx-tab .ic { grid-row: 1 / 3; width: 40px; height: 40px; margin: 0; border-radius: 11px; border: 1px solid var(--line); display: grid; place-items: center; color: var(--dim); transition: color .35s, border-color .35s, box-shadow .35s; }
.ic svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.3; stroke-linecap: round; stroke-linejoin: round; }
.sx-tab b { font-weight: 500; font-size: 16px; color: inherit; letter-spacing: -.01em; }
.sx-tab em { font: 400 10.5px var(--mono); font-style: normal; letter-spacing: .14em; text-transform: uppercase; color: var(--dim); }
.sx-tab i { position: absolute; left: 0; bottom: 0; height: 2px; width: 100%; background: var(--accent); transform: scaleX(0); transform-origin: 0 50%; opacity: .8; }
.sx-tab:hover { color: var(--text); background: rgba(255, 255, 255, .02); }
.sx-tab.on { color: var(--text); background: linear-gradient(90deg, rgba(127, 227, 212, .07), rgba(255, 255, 255, .015)); border-color: var(--line-2); }
.sx-tab.on .ic { color: var(--accent); border-color: rgba(127, 227, 212, .45); box-shadow: 0 0 22px rgba(127, 227, 212, .18); }
.sx-tab.on i { transform: scaleX(var(--p)); }
.sx-tab:focus-visible { outline: 1px solid var(--accent); outline-offset: 2px; }

.sx-stage {
  position: relative; display: flex; flex-direction: column; min-height: 470px; border-radius: var(--r); border: 1px solid var(--line); overflow: hidden;
  background: linear-gradient(180deg, rgba(255, 255, 255, .03), rgba(255, 255, 255, .008));
}
.sx-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--line); font: 400 12px var(--mono); color: var(--muted); }
.sx-bar > i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-2); }
.sx-bar span { margin-left: 10px; letter-spacing: .04em; }
.sx-bar code { margin-left: auto; color: var(--accent); font: inherit; }
.sx-view { position: relative; flex: 1; min-height: 280px; background-image: radial-gradient(rgba(160, 190, 220, .12) 1px, transparent 1px); background-size: 22px 22px; }
.scene { position: absolute; inset: 0; padding: 28px 32px; display: flex; flex-direction: column; justify-content: center; gap: 22px; opacity: 0; visibility: hidden; transform: scale(.985); transition: opacity .5s var(--ease), transform .6s var(--ease), visibility 0s .5s; }
.scene.on { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }
.scene *, .scene *::before { animation-play-state: paused; }
.scene.on *, .scene.on *::before { animation-play-state: running; }
.scene code, .scene span { font: 400 12.5px var(--mono); color: var(--muted); }
.sx-desc { padding: 22px 28px 26px; border-top: 1px solid var(--line); background: rgba(6, 8, 11, .5); }
.sx-desc h3 { font-weight: 500; font-size: 20px; letter-spacing: -.01em; margin-bottom: 6px; }
.sx-desc p { color: var(--muted); font-weight: 300; font-size: 15px; max-width: 560px; }
.sx-desc > * { animation: sxIn .6s var(--ease) both; }
@keyframes sxIn { from { opacity: 0; transform: translateY(6px); } }

/* k8s */
.k-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; max-width: 460px; margin-inline: auto; width: 100%; }
.k-grid i { aspect-ratio: 1.3; border-radius: 8px; border: 1px solid var(--line-2); background: rgba(138, 167, 255, .18); animation: pod 9s infinite; animation-delay: calc(var(--n) * .35s); }
@keyframes pod {
  0%, 10% { background: rgba(138, 167, 255, .22); border-color: rgba(138, 167, 255, .5); transform: none; }
  18% { transform: scale(.82); background: rgba(138, 167, 255, .05); }
  26%, 62% { background: rgba(127, 227, 212, .3); border-color: rgba(127, 227, 212, .7); transform: none; box-shadow: 0 0 16px rgba(127, 227, 212, .25); }
  72%, 100% { background: rgba(138, 167, 255, .22); border-color: rgba(138, 167, 255, .5); box-shadow: none; }
}
.k-grid i:nth-child(n+9) { animation-name: podx; }
@keyframes podx { 0%, 40% { opacity: 0; transform: scale(.5); } 50%, 85% { opacity: 1; transform: none; background: rgba(240, 200, 120, .25); border-color: rgba(240, 200, 120, .6); } 95%, 100% { opacity: 0; transform: scale(.5); } }
.k-load { display: flex; align-items: center; gap: 14px; max-width: 460px; margin-inline: auto; width: 100%; }
.k-load b { flex: 1; height: 4px; border-radius: 4px; background: var(--line); position: relative; overflow: hidden; }
.k-load b::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--accent-2), var(--accent)); transform-origin: 0 50%; animation: load 9s ease-in-out infinite; }
@keyframes load { 0%, 100% { transform: scaleX(.25); } 45%, 60% { transform: scaleX(.92); } }
.legend { display: flex; gap: 16px; justify-content: center; font: 400 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--dim); }
.legend u { text-decoration: none; display: flex; align-items: center; gap: 7px; }
.legend u::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--accent-2); }
.legend .n::before { background: var(--accent); } .legend .s::before { background: #f0c878; }

/* postgres */
.pg { width: 100%; max-width: 460px; margin-inline: auto; overflow: visible; }
.pg path { fill: none; stroke: var(--line-2); stroke-dasharray: 3 5; }
.pg .node rect { fill: rgba(10, 13, 18, .9); stroke: var(--line-2); }
.pg text { fill: var(--text); font: 500 12px var(--mono); text-anchor: middle; }
.pg text.s { fill: var(--dim); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; }
.pg .wal { fill: var(--accent); filter: drop-shadow(0 0 6px var(--accent)); }
.pg .node:first-of-type rect { stroke: rgba(127, 227, 212, .5); animation: beat 2.2s infinite; }
@keyframes beat { 50% { fill: rgba(127, 227, 212, .1); } }
.pitr { display: flex; align-items: center; gap: 14px; max-width: 460px; margin-inline: auto; width: 100%; }
.pitr div { flex: 1; height: 4px; background: var(--line); border-radius: 4px; position: relative; }
.pitr i { position: absolute; top: 50%; left: 0; width: 12px; height: 12px; margin: -6px 0 0 -6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 14px var(--accent); animation: scrub 6s var(--ease) infinite; }
@keyframes scrub { 0%, 15% { left: 100%; } 55%, 80% { left: 62%; } 100% { left: 100%; } }
.pitr code { color: var(--accent); }

/* redis */
.r-keys { display: grid; gap: 8px; max-width: 460px; margin-inline: auto; width: 100%; }
.r-keys li { display: grid; grid-template-columns: 1fr 70px 70px; align-items: center; padding: 10px 14px; border: 1px solid var(--line); border-radius: 9px; background: rgba(10, 13, 18, .7); animation: hit 3.2s infinite; animation-delay: calc(var(--n) * .8s); }
.r-keys code { color: var(--text); } .r-keys b { font: 500 11px var(--mono); color: var(--accent-2); letter-spacing: .1em; } .r-keys span { text-align: right; color: var(--accent); }
@keyframes hit { 0%, 20%, 100% { border-color: var(--line); box-shadow: none; } 6% { border-color: rgba(127, 227, 212, .7); box-shadow: 0 0 20px rgba(127, 227, 212, .2); background: rgba(127, 227, 212, .08); } }
.r-line { width: 100%; max-width: 460px; height: 54px; margin-inline: auto; overflow: visible; }
.r-line path { fill: none; stroke: var(--accent); stroke-width: 1.5; vector-effect: non-scaling-stroke; stroke-dasharray: 500; stroke-dashoffset: 500; animation: draw 4s linear infinite; filter: drop-shadow(0 0 4px rgba(127, 227, 212, .6)); }
@keyframes draw { 0% { stroke-dashoffset: 500; } 70%, 100% { stroke-dashoffset: 0; } }

/* mongo */
.m-feed { height: 100%; max-width: 380px; margin-inline: auto; width: 100%; overflow: hidden; -webkit-mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent); mask-image: linear-gradient(180deg, transparent, #000 18%, #000 82%, transparent); }
.scene[data-s="3"] { padding-block: 0; }
.m-feed > div { display: grid; gap: 12px; padding-block: 12px; animation: feed 14s linear infinite; }
@keyframes feed { to { transform: translateY(calc(-50% - 6px)); } }
.m-feed pre { margin: 0; padding: 12px 16px; border: 1px solid var(--line-2); border-left: 2px solid var(--accent); border-radius: 8px; background: rgba(10, 13, 18, .85); font: 400 12.5px/1.6 var(--mono); color: var(--text); }
.m-feed u { text-decoration: none; color: var(--accent-2); }

/* storage */
.o-files { display: grid; gap: 10px; max-width: 460px; margin-inline: auto; width: 100%; }
.o-files li { display: grid; grid-template-columns: 160px 1fr 62px; gap: 14px; align-items: center; }
.o-files code { color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; } .o-files span { text-align: right; }
.o-files div, .o-use div { height: 6px; border-radius: 6px; background: var(--line); overflow: hidden; }
.o-files i, .o-use i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent-2), var(--accent)); transform-origin: 0 50%; animation: up 5s var(--ease) infinite; animation-delay: calc(var(--n) * .6s); }
@keyframes up { 0% { transform: scaleX(0); } 55%, 90% { transform: scaleX(1); } 100% { transform: scaleX(1); opacity: 0; } }
.o-use { display: flex; align-items: center; gap: 14px; max-width: 460px; margin-inline: auto; width: 100%; padding-top: 14px; border-top: 1px dashed var(--line-2); }
.o-use div { flex: 0 0 120px; } .o-use i { animation: use 6s ease-in-out infinite; animation-delay: 0s; } .o-use code { color: var(--accent); }
@keyframes use { 0%, 100% { transform: scaleX(.3); opacity: 1; } 50% { transform: scaleX(.62); } }

/* ci/cd */
.c-pipe { display: flex; align-items: center; max-width: 460px; margin-inline: auto; width: 100%; }
.c-pipe li { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 10px; position: relative; }
.c-pipe li + li::before { content: ""; position: absolute; top: 14px; right: 50%; width: 100%; height: 2px; background: var(--line-2); }
.c-pipe li + li::after { content: ""; position: absolute; top: 14px; right: 50%; width: 100%; height: 2px; background: var(--accent); transform-origin: 0 50%; transform: scaleX(0); animation: seg 8s infinite; animation-delay: calc(var(--n) * 1.4s - 1.4s); }
.c-pipe i { position: relative; z-index: 1; width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--line-2); background: var(--bg-2); animation: stage 8s infinite; animation-delay: calc(var(--n) * 1.4s - 1.4s); }
.c-pipe li:first-child i { animation-delay: -1.4s; }
@keyframes seg { 0% { transform: scaleX(0); } 12%, 85% { transform: scaleX(1); } 95%, 100% { transform: scaleX(1); opacity: 0; } }
@keyframes stage { 0%, 8% { border-color: var(--line-2); background: var(--bg-2); } 14%, 85% { border-color: var(--accent); background: rgba(127, 227, 212, .2); box-shadow: 0 0 18px rgba(127, 227, 212, .35); } 95%, 100% { border-color: var(--line-2); background: var(--bg-2); box-shadow: none; } }
.c-pipe span { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.c-dom { display: flex; align-items: center; gap: 12px; max-width: 460px; margin-inline: auto; width: 100%; padding: 12px 16px; border: 1px solid var(--line-2); border-radius: 10px; background: rgba(10, 13, 18, .8); }
.c-dom svg { width: 18px; height: 18px; fill: none; stroke: var(--accent); stroke-width: 1.5; }
.c-dom code { color: var(--text); } .c-dom b { margin-left: auto; font: 500 11px var(--mono); color: var(--accent); letter-spacing: .1em; animation: ssl 8s infinite; }
@keyframes ssl { 0%, 40% { opacity: .25; } 55%, 90% { opacity: 1; } 100% { opacity: .25; } }

/* split */
.split { display: grid; grid-template-columns: 1fr 1.05fr; gap: clamp(32px, 6vw, 88px); align-items: center; }
.split-rev { grid-template-columns: 1fr 1fr; }
.split .sec-head { margin-bottom: 40px; }
.split-rev .sec-head { margin-bottom: 0; }

/* steps */
.steps { border-left: 1px solid var(--line); margin-left: 6px; }
.step { position: relative; display: flex; gap: 20px; padding: 6px 0 26px 30px; opacity: .45; transition: opacity .5s; }
.step::before {
  content: ""; position: absolute; left: -4px; top: 14px; width: 7px; height: 7px; border-radius: 50%;
  background: var(--bg); border: 1px solid var(--dim); transition: background .4s, border-color .4s, box-shadow .4s;
}
.step.active { opacity: 1; }
.step.active::before { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 5px rgba(127, 227, 212, .15); }
.step .n { font: 400 12px var(--mono); color: var(--accent); padding-top: 4px; letter-spacing: .1em; }
.step h4 { font-weight: 500; font-size: 17px; margin-bottom: 4px; }
.step p { color: var(--muted); font-size: 14.5px; font-weight: 300; }

/* terminal */
.term { border: 1px solid var(--line-2); border-radius: var(--r); background: rgba(8, 11, 16, .85); overflow: hidden; box-shadow: 0 30px 80px -30px rgba(0, 0, 0, .8), 0 0 60px -20px rgba(138, 167, 255, .18); }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--line); font: 400 12px var(--mono); color: var(--dim); }
.term-bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-2); }
.term-bar span { margin-left: 10px; flex: 1; }
.replay { background: none; border: 0; color: var(--dim); font-size: 16px; cursor: pointer; padding: 2px 6px; transition: color .25s, transform .5s var(--ease); }
.replay:hover { color: var(--accent); transform: rotate(180deg); }
.term-body { margin: 0; padding: 20px 20px 22px; min-height: 340px; font: 400 13px/1.85 var(--mono); color: var(--muted); white-space: pre-wrap; word-break: break-word; }
.term-body .p { color: var(--accent-2); }
.term-body .ok { color: var(--accent); }
.term-body .w { color: var(--text); }
.term-body .d { color: var(--dim); }
.caret { display: inline-block; width: .55em; height: 1.05em; background: var(--accent); vertical-align: -.18em; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* principles */
.principles { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.pr { position: relative; padding: 38px 36px 40px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .4s; }
.pr:hover { background: rgba(127, 227, 212, .025); }
.pr-n { font: 400 12px var(--mono); color: var(--accent); letter-spacing: .1em; display: block; margin-bottom: 40px; }
.pr h3 { font-weight: 500; font-size: 21px; letter-spacing: -.015em; margin-bottom: 10px; }
.pr p { color: var(--muted); font-weight: 300; max-width: 30em; }

/* meters */
.meters { display: grid; gap: 30px; padding: 34px; border: 1px solid var(--line); border-radius: var(--r); background: linear-gradient(180deg, rgba(255, 255, 255, .025), transparent); }
.meter { display: grid; grid-template-columns: 1fr auto; gap: 10px 16px; align-items: baseline; }
.meter span { font-size: 15px; }
.meter em { font: normal 400 11.5px var(--mono); color: var(--dim); letter-spacing: .08em; text-transform: uppercase; }
.meter i { grid-column: 1 / -1; display: block; height: 3px; border-radius: 3px; background: var(--line); overflow: hidden; }
.meter b { display: block; height: 100%; width: 100%; transform-origin: 0 50%; transform: scaleX(0); background: linear-gradient(90deg, var(--accent-2), var(--accent)); transition: transform 1.6s var(--ease); }
.meters.in .meter b { transform: scaleX(var(--v)); }
.meters.in .meter:nth-child(2) b { transition-delay: .12s; }
.meters.in .meter:nth-child(3) b { transition-delay: .24s; }
.meters.in .meter:nth-child(4) b { transition-delay: .36s; }
.meters.in .meter b { animation: breathe 6s ease-in-out 2s infinite alternate; }
@keyframes breathe { from { filter: brightness(1); } to { filter: brightness(1.35); } }

/* CTA */
.cta-box {
  position: relative; text-align: center; padding: clamp(56px, 9vw, 110px) 24px; border: 1px solid var(--line-2); border-radius: 22px; overflow: hidden;
  background: radial-gradient(600px 300px at 50% 0%, rgba(138, 167, 255, .10), transparent 70%), rgba(255, 255, 255, .012);
}
.cta-box > * { position: relative; }
.cta-box .sub { margin: 20px auto 34px; }
.cta-rings { position: absolute !important; inset: 0; pointer-events: none; }
.cta-rings i {
  position: absolute; left: 50%; top: 50%; width: 520px; height: 520px; margin: -260px 0 0 -260px;
  border: 1px solid var(--line); border-radius: 50%; animation: ring 14s linear infinite;
}
.cta-rings i:nth-child(2) { width: 820px; height: 820px; margin: -410px 0 0 -410px; animation-duration: 22s; animation-direction: reverse; }
.cta-rings i:nth-child(3) { width: 1120px; height: 1120px; margin: -560px 0 0 -560px; animation-duration: 34s; }
.cta-rings i::after { content: ""; position: absolute; top: -3px; left: 50%; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
@keyframes ring { to { transform: rotate(360deg); } }

/* footer */
.foot { border-top: 1px solid var(--line); padding: 30px 0; }
.foot-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.foot .up:hover { color: var(--accent); }

/* reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--ease) var(--d, 0s), transform .9s var(--ease) var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; }
.step.reveal.in { opacity: .45; }
.step.reveal.in.active { opacity: 1; }

/* responsive */
@media (max-width: 960px) {
  .sx { grid-template-columns: 1fr; }
  .sx-tabs { display: grid; grid-template-columns: repeat(3, 1fr); }
  .sx-tab { grid-template-columns: 1fr; padding: 12px; row-gap: 4px; }
  .sx-tab .ic { grid-row: auto; margin-bottom: 6px; }
  .split, .split-rev { grid-template-columns: 1fr; }
  .split-rev .meters { order: 2; }
  .nav-links { display: none; }
  /* карта отдельной полосой над текстом, чтобы подписи не лезли под заголовок */
  .hero { align-items: flex-start; padding-top: calc(92px + 56vw); }
  #orbit {
    inset: auto; top: 72px; left: 0; right: 0; height: 56vw;
    -webkit-mask-image: linear-gradient(180deg, #000 72%, transparent);
    mask-image: linear-gradient(180deg, #000 72%, transparent);
  }
  .hero-vignette { background: linear-gradient(0deg, var(--bg), transparent 22%); }
}
@media (max-width: 620px) {
  .wrap { width: calc(100% - 32px); }
  .nav { padding: 12px 16px; }
  .nav-actions { gap: 8px; }
  .btn-sm { padding: 0 13px; font-size: 13px; }
  .principles { grid-template-columns: 1fr; }
  .sx-tabs { grid-template-columns: repeat(2, 1fr); }
  .sx-tab b { font-size: 14px; }
  .scene { padding: 22px 16px; }
  .o-files li { grid-template-columns: 110px 1fr 56px; gap: 8px; }
  .r-keys li { grid-template-columns: 1fr 52px 56px; }
  .pr { padding: 30px 24px 32px; }
  .hero { padding-top: calc(88px + 56vw); }
  .hud span:last-child, .scroll-hint { display: none; }
  .stack li + li::before { display: none; }
  .term-body { font-size: 12px; min-height: 300px; padding: 16px; }
  .meters { padding: 24px; }
  .cta-rings i:nth-child(3) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .meters .meter b { transform: scaleX(var(--v)); }
}