/* 编程小星球主页：白天是天空下的像素星球，夜里是星空中的像素星球 */
:root {
  --sky: #DDF1FF;
  --sky2: #C4E6FF;
  --ink: #1F2A44;
  --muted: #4A5675;
  --paper: #FFFFFF;
  --line: #1F2A44;
  --grass: #7FD36E;
  --grass2: #6CC45D;
  --leaf: #2E8B57;
  --sun: #FFC83D;
  --coral: #FF6B5B;
  --berry: #7A5CFF;
  --stone: #8C94A8;
  --focus: #FF6B5B;
  --tv: #2B3556;
  --soil: #F3D9A4;
  --px: 4px;
  color-scheme: light;
}
[data-theme="dark"] {
  --sky: #12163A;
  --sky2: #1A2050;
  --ink: #F4F0FF;
  --muted: #B9BEE6;
  --paper: #20275C;
  --line: #070A22;
  --grass: #3E9F8A;
  --grass2: #348B79;
  --leaf: #7BE0A6;
  --sun: #FFD84A;
  --coral: #FF8A75;
  --berry: #A994FF;
  --stone: #5D6690;
  --focus: #FFD84A;
  --tv: #0A0E2A;
  --soil: #3B3F7A;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--sky);
  color: var(--ink);
  font: 17px/1.65 ui-rounded, "SF Pro Rounded", system-ui, -apple-system, "PingFang SC", "PingFang TC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  overflow-x: hidden;
}
html[lang="en"] body { line-height: 1.55; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
button { font: inherit; color: inherit; }
code, pre { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); padding: 8px 12px; z-index: 50; }
.skip:focus { left: 8px; }
h1, h2, h3 { line-height: 1.2; margin: 0; }
h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -.01em; }
section { padding: clamp(48px, 6vw, 80px) clamp(18px, 5vw, 64px); max-width: 1240px; margin: 0 auto; }
.sec-head { max-width: 720px; margin-bottom: 32px; }
.sec-head p { color: var(--muted); margin: 12px 0 0; }

/* 像素块：方角 + 实心错位阴影 */
.px { border: 3px solid var(--line); box-shadow: var(--px) var(--px) 0 var(--line); }

/* ---------- 页头 ---------- */
.top {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 16px;
  padding: 10px clamp(14px, 4vw, 40px);
  background: color-mix(in srgb, var(--sky) 88%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 3px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { image-rendering: auto; border-radius: 10px; }
.brand span { display: flex; flex-direction: column; line-height: 1.1; }
.brand b { font-size: 18px; font-weight: 800; white-space: nowrap; }
.brand small { font-size: 12px; color: var(--muted); }
.links { display: flex; gap: 20px; margin-left: auto; }
.links a { text-decoration: none; font-weight: 600; font-size: 15px; }
.links a:hover { color: var(--coral); }
.tools { display: flex; align-items: center; gap: 10px; }
.seg { display: inline-flex; border: 2px solid var(--line); background: var(--paper); }
.seg button {
  border: 0; background: none; padding: 4px 9px; min-width: 34px; min-height: 32px;
  font-size: 14px; font-weight: 700; cursor: pointer; display: grid; place-items: center;
}
.seg button + button { border-left: 2px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--sun); color: #1F2A44; }
.seg svg, .gh svg { width: 16px; height: 16px; fill: currentColor; shape-rendering: crispEdges; }
.gh { display: grid; place-items: center; width: 36px; height: 36px; border: 2px solid var(--line); background: var(--paper); }
.gh svg { width: 18px; height: 18px; shape-rendering: auto; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative; max-width: none;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(24px, 4vw, 56px);
  align-items: center;
  padding-top: clamp(32px, 6vw, 72px); padding-bottom: 0;
  background: linear-gradient(var(--sky) 0 70%, var(--sky2));
  overflow: hidden;
}
.hero > * { position: relative; z-index: 1; }
.sky { position: absolute !important; inset: 0; width: 100%; height: 100%; z-index: 0 !important; image-rendering: pixelated; }
.hero::after {
  /* 星球地表：底部一条像素草地弧线 */
  content: ""; position: absolute; left: -5%; right: -5%; bottom: -1px; height: 120px; z-index: 0;
  background: var(--grass);
  border-top: 4px solid var(--line);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
}
.hero-copy { max-width: 540px; justify-self: end; padding-bottom: 150px; }
.kicker { font-weight: 700; color: var(--leaf); margin: 0 0 12px; }
h1 {
  font-size: clamp(44px, 7vw, 84px); font-weight: 900; letter-spacing: -.02em; line-height: 1.08;
  text-shadow: 4px 4px 0 var(--sun);
}
[data-theme="dark"] h1 { text-shadow: 4px 4px 0 var(--berry); }
html[lang="en"] h1 { font-size: clamp(40px, 6vw, 72px); }
.lede { font-size: 18px; color: var(--muted); margin: 20px 0 28px; max-width: 34em; }
.cta { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding: 10px 22px; font-weight: 800; text-decoration: none; background: var(--paper);
  border: 3px solid var(--line); box-shadow: 4px 4px 0 var(--line);
  transition: transform .12s, box-shadow .12s;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--line); }
.btn:active { transform: translate(3px, 3px); box-shadow: 1px 1px 0 var(--line); }
.btn-go { background: var(--coral); color: #fff; }
[data-theme="dark"] .btn-go { color: #1F2A44; }
.facts { margin: 18px 0 0; font-size: 14px; color: var(--muted); }

/* 电视机 */
.console { display: flex; align-items: flex-end; gap: clamp(12px, 2vw, 24px); justify-self: start; padding-bottom: 64px; }
.tv { width: min(600px, 100%); }
.tv-screen {
  position: relative; background: var(--tv); padding: 14px; color: #F4F0FF;
  border: 4px solid var(--line); box-shadow: 8px 8px 0 var(--line);
  outline: none;
}
.tv-screen::before {
  /* 天线 */
  content: ""; position: absolute; left: 50%; top: -44px; width: 80px; height: 40px; transform: translateX(-50%);
  background:
    linear-gradient(var(--line), var(--line)) 8px 0 / 4px 4px no-repeat,
    linear-gradient(var(--line), var(--line)) 68px 0 / 4px 4px no-repeat,
    linear-gradient(var(--line), var(--line)) 12px 4px / 4px 8px no-repeat,
    linear-gradient(var(--line), var(--line)) 64px 4px / 4px 8px no-repeat,
    linear-gradient(var(--line), var(--line)) 16px 12px / 4px 8px no-repeat,
    linear-gradient(var(--line), var(--line)) 60px 12px / 4px 8px no-repeat,
    linear-gradient(var(--line), var(--line)) 20px 20px / 4px 8px no-repeat,
    linear-gradient(var(--line), var(--line)) 56px 20px / 4px 8px no-repeat,
    linear-gradient(var(--line), var(--line)) 24px 28px / 32px 12px no-repeat;
}
.tv-screen:focus-visible { box-shadow: 8px 8px 0 var(--line), 0 0 0 4px var(--focus); }
.tv-legs { height: 16px; margin: 0 22%; background:
  linear-gradient(var(--line), var(--line)) left / 16px 100% no-repeat,
  linear-gradient(var(--line), var(--line)) right / 16px 100% no-repeat; }
.tv-head { display: flex; justify-content: space-between; font-size: 13px; font-weight: 700; margin-bottom: 10px; color: #C9CEF5; }
.mode { color: var(--sun); }
.board { background: #10153A; padding: 8px; }
.grid {
  position: relative; display: grid; grid-template-columns: repeat(var(--cols, 6), 1fr);
  aspect-ratio: var(--cols, 6) / var(--rows, 4);
}
.cell { position: relative; background: #7FD36E; }
.cell.alt { background: #6CC45D; }
[data-theme="dark"] .cell { background: #3FAE96; }
[data-theme="dark"] .cell.alt { background: #359A85; }
.cell.stone::after {
  content: ""; position: absolute; inset: 16%;
  background: #8C94A8; box-shadow: inset -4px -4px 0 #5D6690, inset 4px 4px 0 #C3C9D9;
}
.cell.star svg { position: absolute; inset: 14%; width: 72%; height: 72%; }
.cell.star.got svg { animation: pop .5s steps(4) forwards; }
.cell.trail::before { content: ""; position: absolute; inset: 40%; background: rgba(255, 255, 255, .55); }
.robot {
  position: absolute; left: 0; top: 0; z-index: 2;
  width: calc(100% / var(--cols, 6)); height: calc(100% / var(--rows, 4));
  transition: transform .38s steps(6);
  will-change: transform;
}
.robot svg { width: 100%; height: 100%; display: block; }
.robot.bump { animation: bump .36s steps(4); }
@keyframes bump { 25% { translate: 6% 0; } 50% { translate: -6% 0; } 75% { translate: 4% 0; } }
@keyframes pop { 0% { transform: scale(1); opacity: 1; } 60% { transform: scale(1.5) rotate(20deg); opacity: 1; } 100% { transform: scale(.2) rotate(45deg); opacity: 0; } }

.prog { display: flex; align-items: center; gap: 8px; margin: 12px 0 10px; min-height: 44px; }
.loop {
  flex: none; min-width: 44px; height: 40px; display: grid; place-items: center;
  font-weight: 900; background: var(--berry); color: #fff; border: 2px solid #070A22; font-size: 15px;
}
.loop.on { background: var(--sun); color: #1F2A44; }
#slots { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; flex: 1; }
#slots li {
  height: 40px; display: grid; place-items: center; font-size: 22px; font-weight: 900;
  background: rgba(255, 255, 255, .08); border: 2px dashed rgba(255, 255, 255, .25);
}
#slots li.full { background: #F4F0FF; color: #1F2A44; border: 2px solid #070A22; }
#slots li.new { animation: drop .22s steps(3); }
#slots li.now { background: var(--sun); outline: 3px solid var(--coral); outline-offset: 1px; }
#slots li.bad { background: var(--coral); color: #fff; }
@keyframes drop { from { transform: translateY(-40%); opacity: 0; } to { transform: none; opacity: 1; } }
.pad { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.pad button {
  display: flex; align-items: center; justify-content: center; gap: 6px; min-height: 42px;
  background: #2E5B4A; color: #fff; border: 2px solid #070A22; cursor: pointer; font-size: 14px; font-weight: 700;
  padding: 4px 6px;
}
.pad button i { font-style: normal; font-size: 18px; font-weight: 900; }
.pad button.run { background: var(--coral); }
.pad button:hover { filter: brightness(1.12); }
.pad button.focus { outline: 4px solid var(--sun); outline-offset: 1px; position: relative; z-index: 1; transform: scale(1.04); }
.pad button.press { transform: scale(.94); }
.msg { margin: 10px 0 0; min-height: 1.6em; font-size: 14px; font-weight: 700; color: var(--sun); }

/* 遥控器 */
.remote {
  flex: none; width: 112px; padding: 18px 12px 14px; background: var(--paper);
  border: 3px solid var(--line); box-shadow: 4px 4px 0 var(--line); border-radius: 40px 40px 18px 18px;
  display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 28px) 34px auto; gap: 2px;
  justify-items: center; align-items: center;
}
.k { width: 28px; height: 28px; padding: 0; border: 2px solid var(--line); background: var(--sky2); cursor: pointer; position: relative; }
.k::after { content: ""; position: absolute; inset: 0; margin: auto; width: 0; height: 0; border: 5px solid transparent; }
.k-up { grid-area: 1 / 2; } .k-up::after { border-bottom-color: var(--ink); margin-top: 2px; }
.k-left { grid-area: 2 / 1; } .k-left::after { border-right-color: var(--ink); margin-left: 2px; }
.k-right { grid-area: 2 / 3; } .k-right::after { border-left-color: var(--ink); margin-left: 9px; }
.k-down { grid-area: 3 / 2; } .k-down::after { border-top-color: var(--ink); margin-top: 9px; }
.k-ok { grid-area: 2 / 2; border-radius: 50%; background: var(--coral); color: #fff; font-size: 10px; font-weight: 900; }
.k-ok::after, .k-back::after { display: none; }
.k-back { grid-area: 4 / 2; width: 34px; border-radius: 50%; font-size: 14px; font-weight: 900; }
.k.hit { transform: scale(.85); background: var(--sun); }
.remote-tip { grid-column: 1 / -1; font-size: 11px; line-height: 1.45; color: var(--muted); margin: 6px 0 0; }

/* ---------- 流程 ---------- */
.flow { padding-top: 64px; }
.steps { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: s; }
.steps li { counter-increment: s; position: relative; padding: 52px 20px 0 0; }
.steps li::before {
  content: counter(s); position: absolute; top: 0; left: 0; width: 38px; height: 38px; display: grid; place-items: center;
  font-weight: 900; background: var(--sun); border: 3px solid var(--line); color: #1F2A44;
}
.steps li::after { content: ""; position: absolute; top: 17px; left: 48px; right: 10px; border-top: 4px dotted var(--line); opacity: .35; }
.steps li:last-child::after { display: none; }
.steps b { display: block; font-size: 20px; margin-bottom: 6px; }
.steps span { color: var(--muted); font-size: 15px; }

/* ---------- 关卡地图 ---------- */
.map { max-width: 1240px; }
.planets { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 24px; }
.planet {
  --c: var(--grass); position: relative; padding: 22px 20px 20px; background: var(--paper);
  border: 3px solid var(--line); box-shadow: 6px 6px 0 var(--line);
}
.planet header { display: flex; gap: 14px; align-items: center; margin-bottom: 8px; }
.orb { flex: none; width: 52px; height: 52px; image-rendering: pixelated; }
.planet h3 { font-size: 20px; font-weight: 800; }
.planet .range { font-size: 13px; color: var(--muted); font-weight: 700; }
.planet p { margin: 0 0 14px; font-size: 14px; color: var(--muted); min-height: 3.2em; }
.path { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; position: relative; }
.tile {
  position: relative; height: 54px; border: 3px solid var(--line); background: var(--c); color: #1F2A44;
  font-weight: 900; font-size: 18px; cursor: pointer; padding: 0;
  transition: transform .12s;
}
/* 第二排倒序排列，形成蛇形小路 */
.tile:nth-child(4) { order: 3; } .tile:nth-child(5) { order: 2; } .tile:nth-child(6) { order: 1; }
.tile:hover { transform: translateY(-3px); }
.tile[aria-pressed="true"] { background: var(--sun); outline: 4px solid var(--coral); outline-offset: 2px; }
.tile .bot { position: absolute; right: -10px; top: -16px; width: 24px; height: 24px; pointer-events: none; }
.detail {
  margin-top: 32px; padding: 22px 24px; background: var(--tv); color: #F4F0FF;
  border: 3px solid var(--line); box-shadow: 6px 6px 0 var(--line);
  display: grid; grid-template-columns: auto 1fr; gap: 6px 24px; align-items: start;
}
.detail .no { grid-row: span 3; font-size: 48px; font-weight: 900; color: var(--sun); line-height: 1; font-variant-numeric: tabular-nums; }
.detail h3 { font-size: 24px; }
.detail .tag { color: #C9CEF5; font-size: 14px; }
.detail .refs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 8px; }
.detail .refs div { background: rgba(255, 255, 255, .07); padding: 10px 14px; border: 2px solid rgba(255, 255, 255, .15); }
.detail .refs b { display: block; font-size: 13px; color: var(--sun); }
.detail .refs code { font-size: 16px; white-space: pre-wrap; font-family: inherit; font-weight: 700; letter-spacing: .02em; }
.legend { font-size: 14px; color: var(--muted); margin-top: 18px; max-width: 62em; }

/* ---------- 截图 ---------- */
.strip {
  display: grid; grid-auto-flow: column; grid-auto-columns: min(640px, 86vw); gap: 22px;
  overflow-x: auto; scroll-snap-type: x mandatory; padding: 4px 8px 22px 4px; outline: none;
}
.strip:focus-visible { outline: 3px solid var(--focus); }
.strip figure { margin: 0; scroll-snap-align: start; }
.strip img { width: 100%; border: 4px solid var(--line); box-shadow: 6px 6px 0 var(--line); background: #F7F4EE; }
.strip figcaption { margin-top: 12px; font-size: 15px; font-weight: 600; }

/* ---------- 档案 ---------- */
.who-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 28px; }
.who-c { padding: 22px; border: 3px solid var(--line); background: var(--paper); position: relative; }
.who-c h3 { font-size: 20px; margin-bottom: 6px; }
.who-c p { margin: 0; color: var(--muted); font-size: 15px; }
.who-c::before { content: ""; display: block; width: 32px; height: 8px; margin-bottom: 14px; }
.sprout::before { background: var(--grass); box-shadow: 8px -8px 0 var(--grass), 16px -16px 0 var(--leaf); width: 8px; }
.star::before { background: var(--sun); box-shadow: 8px -8px 0 var(--sun), 16px 0 0 var(--sun); width: 8px; }
.duo::before { background: var(--coral); box-shadow: 16px 0 0 var(--berry); width: 8px; }
.note { color: var(--muted); font-size: 15px; margin-top: 18px; }

/* ---------- 家长 ---------- */
.asks { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 28px; }
.asks li { padding-left: 26px; position: relative; }
.asks li::before { content: ""; position: absolute; left: 0; top: .55em; width: 10px; height: 10px; background: var(--coral); box-shadow: 3px 3px 0 var(--line); }
.privacy { margin-top: 36px; padding: 22px 24px; border: 3px dashed var(--line); }
.privacy h3 { font-size: 20px; margin-bottom: 8px; }
.privacy p { margin: 0 0 8px; color: var(--muted); }
.privacy p:last-child { margin: 0; }

/* ---------- 安装 ---------- */
.dl { display: grid; grid-template-columns: auto 1fr; gap: 12px 40px; align-items: start; margin-bottom: 36px; }
.btn.big { font-size: 20px; padding: 16px 30px; }
.spec { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 18px; font-size: 15px; }
.spec dt { font-weight: 800; }
.spec dd { margin: 0; color: var(--muted); }
.more { grid-column: 1; margin: 0; font-size: 15px; }
.tabs { display: flex; gap: 0; border-bottom: 3px solid var(--line); flex-wrap: wrap; }
.tabs button {
  border: 3px solid var(--line); border-bottom: 0; background: var(--sky2); padding: 10px 20px; margin-right: -3px;
  font-weight: 800; cursor: pointer; position: relative; top: 3px;
}
.tabs button[aria-selected="true"] { background: var(--paper); }
.pane { background: var(--paper); border: 3px solid var(--line); border-top: 0; padding: 22px 26px 24px; }
.pane ol { margin: 0; padding-left: 1.4em; display: grid; gap: 10px; }
.pane pre { background: var(--tv); color: #F4F0FF; padding: 14px 16px; overflow-x: auto; margin: 16px 0 0; font-size: 14px; }
.url code { font-size: 13px; word-break: break-all; background: var(--sky2); padding: 4px 8px; display: inline-block; }
.verify { margin-top: 24px; }
.verify summary { cursor: pointer; font-weight: 800; }
.verify p { color: var(--muted); font-size: 15px; }
.hash { display: grid; gap: 2px; }
.hash span { font-weight: 700; color: var(--ink); font-size: 14px; }
.hash code { word-break: break-all; font-size: 13px; }

/* ---------- 页脚 ---------- */
.foot { border-top: 3px solid var(--line); background: var(--sky2); margin-top: 40px; }
.foot-in { max-width: 1240px; margin: 0 auto; padding: 26px clamp(18px, 5vw, 64px); display: flex; flex-wrap: wrap; align-items: center; gap: 14px 28px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.foot nav a { font-weight: 600; }
.foot p { margin: 0 0 0 auto; color: var(--muted); font-size: 14px; }
.brand.small img { border-radius: 7px; }

/* 滚动渐入，只动 transform 与 opacity */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { justify-self: start; padding-bottom: 0; }
  .console { justify-self: center; padding-top: 40px; }
  .planets { grid-template-columns: repeat(2, 1fr); }
  .links { display: none; }
  .tools { margin-left: auto; }
}
@media (max-width: 700px) {
  body { font-size: 16px; }
  .top { gap: 8px; padding: 10px 14px; }
  .brand { gap: 8px; }
  .brand img { width: 32px; height: 32px; border-radius: 8px; }
  .brand b { font-size: 15px; }
  .brand small { display: none; }
  .tools { gap: 6px; }
  .seg button { padding: 2px 5px; min-width: 28px; min-height: 30px; font-size: 13px; }
  .gh { width: 30px; height: 30px; }
  .console { flex-direction: column; align-items: center; width: 100%; padding-bottom: 40px; }
  .tv-screen { padding: 10px; box-shadow: 5px 5px 0 var(--line); }
  .pad button span { display: none; }
  .pad button i { font-size: 20px; }
  .remote { width: auto; grid-template-columns: repeat(3, 34px) 20px 40px; grid-template-rows: repeat(3, 30px); border-radius: 18px; padding: 10px 16px; }
  .k { width: 30px; height: 30px; }
  .k-back { grid-area: 2 / 5; width: 36px; height: 36px; }
  .remote-tip { display: none; }
  .steps { grid-template-columns: 1fr 1fr; gap: 28px 12px; }
  .steps li:nth-child(2)::after { display: none; }
  .planets, .who-grid, .asks { grid-template-columns: 1fr; }
  .dl { grid-template-columns: 1fr; }
  .detail { grid-template-columns: 1fr; }
  .detail .no { grid-row: auto; font-size: 36px; }
  .detail .refs { grid-template-columns: 1fr; }
  .foot p { margin-left: 0; }
  .hero::after { height: 70px; }
  .tabs button { padding: 8px 14px; }
  .pane { padding: 18px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}