:root {
  --bg: #070b10;
  --bg-2: #0c1620;
  --panel: rgba(10, 20, 30, 0.78);
  --ink: #e8f2f6;
  --ink-2: #c5d6df;
  --on-mint: #04211b;
  --line: rgba(146, 196, 206, 0.2);
  --mint: #3ee0c2;
  --mint-2: #8ef6e0;
  --link: #8ef6e0;
  --muted: #a9c0cb;
  --warn: #f0c48a;
  --warn-bg: rgba(240, 196, 138, 0.08);
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "Cascadia Mono", "Sarasa Mono SC", Consolas, "Courier New", monospace;
  --wrap: 1160px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font);
  font-size: clamp(1rem, 0.96rem + 0.15vw, 1.0625rem);
  line-height: 1.65;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(62, 224, 194, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(62, 224, 194, 0.045) 1px, transparent 1px),
    radial-gradient(980px 460px at 88% -8%, rgba(62, 224, 194, 0.16), transparent 58%),
    radial-gradient(720px 420px at -12% 8%, rgba(22, 78, 112, 0.55), transparent 52%);
  background-size: 64px 64px, 64px 64px, auto, auto;
  background-attachment: fixed;
}

img { max-width: 100%; height: auto; }

a { color: var(--link); text-underline-offset: 0.18em; }

a:hover { color: #fff; }

:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: var(--space-4);
  top: -40px;
  background: var(--mint);
  color: var(--on-mint);
  padding: var(--space-2) var(--space-3);
  z-index: 8;
}

.skip:focus { top: var(--space-2); }

.wrap {
  width: min(var(--wrap), calc(100% - 2rem));
  margin-inline: auto;
}

.band { color: var(--ink); }

.top {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(7, 11, 16, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.top__bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 68px;
}

.top__bar > .btn { margin-left: var(--space-3); flex-shrink: 0; }

.top-extra { display: none; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1rem;
  margin-right: auto;
  text-transform: lowercase;
}

.brand img { display: block; }

.nav-desk { display: none; }

.nav-desk a,
.nav-fold a {
  color: var(--ink-2);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0 0.5rem;
  border-radius: 8px;
  font-size: 0.875rem;
  transition: color 140ms var(--ease), background 140ms var(--ease);
}

.nav-desk a:hover,
.nav-fold a:hover,
.nav-desk a[aria-current="page"],
.nav-fold a[aria-current="page"] {
  color: var(--on-mint);
  background: var(--mint);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 var(--space-4);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: transform 140ms var(--ease), background 140ms var(--ease), box-shadow 140ms var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn--solid {
  background: var(--mint);
  color: var(--on-mint);
  box-shadow: 0 0 0 1px rgba(62, 224, 194, 0.4), 0 0 28px rgba(62, 224, 194, 0.28);
}

.btn--solid:hover {
  background: #67ebd2;
  color: var(--on-mint);
}

.btn--ghost {
  background: rgba(62, 224, 194, 0.06);
  color: #f4fbfb;
  border-color: rgba(62, 224, 194, 0.45);
}

.btn--ghost:hover {
  background: rgba(62, 224, 194, 0.08);
  color: #fff;
  border-color: var(--mint);
}

.btn--ink {
  background: transparent;
  color: var(--mint-2);
  border-color: rgba(62, 224, 194, 0.55);
}

.btn--ink:hover {
  background: var(--mint);
  color: var(--on-mint);
}

.nav-fold[open] nav {
  position: absolute;
  z-index: 6;
  left: 0;
  right: 0;
  top: 100%;
  display: grid;
  background: #070b10;
  box-shadow: var(--shadow);
  padding: var(--space-2) var(--space-4) var(--space-4);
  border-bottom: 1px solid var(--line);
}

.nav-fold a { width: 100%; }

.nav-fold summary {
  list-style: none;
  cursor: pointer;
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0 var(--space-3);
  color: var(--ink);
  border-radius: 8px;
  border: 1px solid var(--line);
}

.nav-fold summary::-webkit-details-marker { display: none; }

.hero { padding: var(--space-8) 0 var(--space-8); }

.kicker {
  margin: 0 0 var(--space-3);
  color: var(--mint);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 var(--space-4);
  font-size: clamp(2.5rem, 1.3rem + 3.6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  font-weight: 700;
  color: #fff;
}

.lede {
  margin: 0 0 var(--space-6);
  max-width: 40rem;
  font-size: clamp(1.05rem, 1rem + 0.3vw, 1.22rem);
  line-height: 1.6;
  color: var(--ink-2);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.fine {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

.hero__grid {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

.meters {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.meters li {
  display: grid;
  gap: 0.15rem;
  margin: 0;
  padding: 0.7rem 0.8rem;
  border-radius: 6px;
  border: 1px solid rgba(62, 224, 194, 0.28);
  background: rgba(8, 18, 26, 0.78);
}

.meters span {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.meters strong {
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.sheet,
.card,
.qa,
.steps li,
.table-wrap,
.price-band {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.sheet {
  color: var(--ink);
  border-radius: 6px;
  padding: var(--space-5);
}

.sheet__tag {
  margin: 0 0 var(--space-3);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

.sheet dl { margin: 0; }

.sheet dl div {
  display: grid;
  grid-template-columns: 9.5rem 1fr;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--line);
}

.sheet dt {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--muted);
}

.sheet dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

main { padding: var(--space-10) 0 var(--space-16); }

.crumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  margin: 0 0 var(--space-5);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.crumb a { color: var(--mint-2); }

h2 {
  margin: var(--space-12) 0 var(--space-4);
  font-size: clamp(1.45rem, 1.15rem + 1vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
  color: #fff;
}

main > .wrap > h2:first-of-type,
.page-head + h2,
.crumb + h1 + .lede + h2 { margin-top: var(--space-8); }

h3 {
  margin: var(--space-8) 0 var(--space-3);
  font-size: 1.15rem;
  line-height: 1.35;
  color: #fff;
}

p { margin: 0 0 var(--space-4); }

.prose p,
.prose li { max-width: 68ch; }

ul, ol { margin: 0 0 var(--space-5); padding-left: 1.2rem; }

li + li { margin-top: var(--space-2); }

.cards,
.modes,
.groups {
  display: grid;
  gap: var(--space-3);
  margin: 0 0 var(--space-6);
}

.card {
  border-radius: 6px;
  padding: var(--space-4) var(--space-4) var(--space-5);
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.card:hover {
  border-color: rgba(62, 224, 194, 0.55);
  transform: translateY(-2px);
}

.card h3 { margin: 0 0 var(--space-2); }

.card h3 a {
  color: #fff;
  text-decoration: none;
}

.card h3 a:hover { color: var(--mint); }

.card p:last-child { margin-bottom: 0; color: var(--ink-2); }

.modes { counter-reset: slot; }

.modes .card h3::before {
  counter-increment: slot;
  content: counter(slot, decimal-leading-zero);
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--mint);
  font-weight: 500;
}

.table-wrap {
  overflow-x: auto;
  margin: 0 0 var(--space-6);
  border-radius: 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

td code { overflow-wrap: anywhere; }

th, td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mint-2);
  font-weight: 600;
  background: rgba(62, 224, 194, 0.08);
}

tr:last-child td { border-bottom: 0; }

tbody tr:hover td { background: rgba(62, 224, 194, 0.04); }

code, pre { font-family: var(--mono); font-size: 0.875rem; }

code {
  background: rgba(62, 224, 194, 0.1);
  color: #d9fff6;
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  overflow-x: auto;
  background: #05080c;
  color: #d9fff6;
  padding: var(--space-4);
  border-radius: 6px;
  border: 1px solid var(--line);
  line-height: 1.55;
  margin: 0 0 var(--space-5);
}

pre code { background: transparent; padding: 0; color: inherit; }

.note {
  background: var(--warn-bg);
  border: 1px solid rgba(240, 196, 138, 0.35);
  border-left: 3px solid var(--warn);
  padding: var(--space-4) var(--space-5);
  border-radius: 6px;
  margin: 0 0 var(--space-6);
}

.note strong { color: var(--warn); }

.qa {
  border-radius: 6px;
  padding: 0 var(--space-4);
  margin-bottom: var(--space-3);
}

.qa summary {
  cursor: pointer;
  min-height: 48px;
  display: flex;
  align-items: center;
  font-weight: 600;
  color: #fff;
}

.qa p:last-child { margin-bottom: var(--space-4); color: var(--ink-2); }

.steps {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: start;
  border-radius: 6px;
  padding: var(--space-4);
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--line);
}

.steps b {
  font-family: var(--mono);
  color: var(--mint);
}

.foot {
  border-top: 1px solid var(--line);
  background: rgba(5, 8, 12, 0.72);
  color: var(--ink-2);
  padding: var(--space-12) 0 var(--space-6);
}

.foot a { color: var(--ink-2); text-decoration: none; }

.foot a:hover { color: var(--mint); }

.foot__grid { display: grid; gap: var(--space-6); }

.foot__label {
  margin: 0 0 var(--space-3);
  color: #fff;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.foot nav { display: grid; gap: var(--space-2); }

.foot__cluster {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
}

.foot__cluster a { min-height: 44px; display: inline-flex; align-items: center; }

.foot__bar {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  font-size: 0.875rem;
  color: var(--muted);
}

.offer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-5);
  margin: 0 0 var(--space-6);
  padding: var(--space-4) var(--space-5);
  border: 1px solid rgba(62, 224, 194, 0.28);
  border-radius: 6px;
  background: rgba(8, 18, 24, 0.72);
  width: fit-content;
  max-width: 100%;
}

.offer__price {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.offer__price b {
  font-family: var(--mono);
  font-size: clamp(3.4rem, 8vw, 5rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: var(--mint);
  text-shadow: 0 0 28px rgba(62, 224, 194, 0.45);
}

.offer__price span {
  font-family: var(--mono);
  letter-spacing: 0.08em;
  color: var(--ink-2);
  font-size: 0.85rem;
}

.offer p { margin: 0; max-width: 22rem; color: var(--ink); }

.tutorial {
  margin: 0 0 var(--space-10);
  padding: var(--space-4);
  border-radius: 8px;
  border: 1px solid rgba(62, 224, 194, 0.28);
  background: rgba(5, 10, 14, 0.72);
  box-shadow: var(--shadow);
}

.tutorial figcaption {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mint);
  margin-bottom: var(--space-3);
}

.tutorial img,
.player {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid rgba(62, 224, 194, 0.2);
  background: #05080c;
}

.tutorial__note {
  margin: var(--space-3) 0 0;
  color: var(--muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  padding: 0;
  margin: 0;
}

.chips li {
  background: rgba(62, 224, 194, 0.08);
  border: 1px solid rgba(62, 224, 194, 0.22);
  color: var(--ink);
  border-radius: 4px;
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
  line-height: 1.4;
}

.wide-wrap table { min-width: 1080px; }

.dense td {
  white-space: nowrap;
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.muted { color: var(--muted); font-weight: 400; }

.scroll-hint { display: none; color: var(--muted); font-size: 0.875rem; }

.price-band {
  display: grid;
  gap: var(--space-5);
  border-radius: 6px;
  padding: var(--space-6);
  margin: 0 0 var(--space-8);
  border-color: rgba(62, 224, 194, 0.4);
  background:
    radial-gradient(420px 160px at 0% 0%, rgba(62, 224, 194, 0.16), transparent 70%),
    rgba(8, 18, 26, 0.9);
  box-shadow: 0 0 48px rgba(62, 224, 194, 0.08);
}

.price-band__num {
  margin: 0 0 var(--space-2);
  font-family: var(--mono);
  font-size: clamp(2.6rem, 5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--mint);
  text-shadow: 0 0 24px rgba(62, 224, 194, 0.35);
}

.price-band__num small {
  font-size: 0.9rem;
  color: var(--ink-2);
  font-weight: 600;
  letter-spacing: 0.06em;
}

.price-band p,
.price-band li { color: var(--ink); }

.fine-ink { color: var(--muted); font-size: 0.875rem; }

.related { color: var(--muted); }

@media (max-width: 959px) {
  .scroll-hint { display: block; }
}

@media (min-width: 720px) {
  .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .modes { grid-template-columns: 1fr 1fr; }
  .groups { grid-template-columns: 1fr 1fr 1fr; }
  .price-band { grid-template-columns: 1.2fr 0.8fr; align-items: center; }
  .foot__grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}

@media (min-width: 960px) {
  .wrap { width: min(var(--wrap), calc(100% - 3rem)); }
  .brand { margin-right: 0; }
  .nav-desk {
    display: flex;
    align-items: center;
    margin-left: auto;
    gap: 0.1rem;
  }
  .top-extra {
    display: flex;
    align-items: center;
    gap: 0.15rem;
  }
  .top-extra a {
    color: var(--ink-2);
    text-decoration: none;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 0 0.55rem;
    border-radius: 8px;
    font-size: 0.875rem;
  }
  .top-extra a:hover { color: var(--on-mint); background: var(--mint); }
  .nav-fold { display: none; }
  .hero { padding: var(--space-16) 0 4.5rem; }
  .hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
    align-items: end;
    gap: var(--space-12);
  }
}

@media (min-width: 1100px) {
  .modes { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}