/* pixelflow.baozangapp.com — single-page game portal
   Dark game-portal look; intentionally distinct from the other sub-sites. */

:root {
  --bg: #0b1020;
  --bg-soft: #0e1428;
  --card: #141c33;
  --card-2: #182242;
  --border: #26335c;
  --text: #e8ecf8;
  --muted: #9aa7c7;
  --accent: #7c5cff;
  --accent-2: #33e0c8;
  --accent-soft: rgba(124, 92, 255, .16);
  --warn: #ffb44d;
  --wrap: 1080px;
  --radius: 14px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(124, 92, 255, .14), transparent 60%),
    radial-gradient(700px 420px at -10% 12%, rgba(51, 224, 200, .08), transparent 55%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; border-radius: 4px; }

/* ============ pixel block mark (brand) ============ */
.brand-px {
  display: inline-block;
  width: 18px; height: 18px;
  border-radius: 4px;
  background: #6c8cff;
  box-shadow:
    9px 0 0 #7c5cff,
    18px 0 0 #33e0c8;
  margin-right: 26px;
  vertical-align: -2px;
}

/* ============ nav ============ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 16, 32, .82);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-in { display: flex; align-items: center; justify-content: space-between; min-height: 60px; gap: 14px; }
.brand { font-weight: 700; font-size: 1.05rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand .ver { color: var(--muted); font-weight: 500; font-size: .85rem; margin-left: 2px; }
.nav-links { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  color: var(--muted); font-size: .92rem; padding: 8px 12px; border-radius: 8px;
}
.nav-links a:hover { color: var(--text); background: var(--accent-soft); text-decoration: none; }
.nav-links .nav-cta {
  color: #fff; font-weight: 600; margin-left: 6px;
  background: linear-gradient(135deg, var(--accent), #5d8bff);
  border: 0; cursor: pointer;
}
.nav-links .nav-cta:hover { filter: brightness(1.12); }
.lang-row {
  display: inline-flex; align-items: center; gap: 4px;
  margin-left: 10px; padding-left: 14px;
  border-left: 1px solid var(--border);
}
.lang-row .lang {
  color: var(--muted); font-size: .78rem; font-weight: 700; letter-spacing: .04em;
  padding: 6px 8px; border-radius: 6px;
}
.lang-row .lang:hover { color: var(--text); background: var(--accent-soft); text-decoration: none; }
.lang-row .lang.on { color: #fff; background: var(--accent-soft); }
.footer .lang-row { border-left: 0; margin-left: 0; padding-left: 0; }
.burger {
  display: none; appearance: none; background: var(--card); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 14px;
  font-size: .9rem; cursor: pointer;
}

/* ============ hero + game stage ============ */
.hero { padding: 44px 0 8px; text-align: center; }
.kicker {
  display: inline-block; font-size: .82rem; letter-spacing: .04em;
  color: var(--accent-2); text-transform: uppercase; font-weight: 600;
  background: rgba(51, 224, 200, .09); border: 1px solid rgba(51, 224, 200, .25);
  border-radius: 999px; padding: 5px 14px; margin-bottom: 18px;
}
.hero h1 { font-size: clamp(1.7rem, 4.2vw, 2.6rem); line-height: 1.25; letter-spacing: -.01em; }
.hero-intro { max-width: 780px; margin: 16px auto 0; color: var(--muted); font-size: 1.02rem; }
.hero-intro strong { color: var(--text); }

.stage { max-width: 920px; margin: 30px auto 0; text-align: left; }
.game-frame {
  position: relative; width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 78vh;
  background: #05070f;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .5);
}
.game-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; display: block; }

.cover {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; text-align: center; padding: 24px;
  background:
    radial-gradient(520px 300px at 50% 30%, rgba(124, 92, 255, .22), transparent 65%),
    linear-gradient(180deg, rgba(11, 16, 32, .4), rgba(5, 7, 15, .88));
}
.cover h2 { font-size: 1.5rem; letter-spacing: .01em; }
.cover p { color: var(--muted); font-size: .9rem; }
.px-row { display: flex; gap: 10px; margin-bottom: 4px; }
.px { width: 22px; height: 22px; border-radius: 5px; opacity: .95; }
.px.p1 { background: #6c8cff; }
.px.p2 { background: #7c5cff; }
.px.p3 { background: #33e0c8; }
.px.p4 { background: #ffb44d; }
.px.p5 { background: #ff6d9d; }
.px-row .px { animation: bob 2.6s ease-in-out infinite; }
.px-row .px:nth-child(2) { animation-delay: .22s; }
.px-row .px:nth-child(3) { animation-delay: .44s; }
.px-row .px:nth-child(4) { animation-delay: .66s; }
.px-row .px:nth-child(5) { animation-delay: .88s; }
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }

button.play {
  appearance: none; border: 0; cursor: pointer;
  background: linear-gradient(135deg, var(--accent), #5d8bff);
  color: #fff; font-size: 1.05rem; font-weight: 700;
  padding: 14px 46px; min-height: 50px; border-radius: 999px;
  box-shadow: 0 12px 34px rgba(124, 92, 255, .38);
  transition: transform .16s ease, filter .16s ease;
}
button.play:hover { transform: translateY(-2px); filter: brightness(1.1); }
.cover-note { font-size: .78rem !important; opacity: .85; }

.toolbar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 12px; flex-wrap: wrap;
}
.toolbar .note { color: var(--muted); font-size: .8rem; }
.toolbar .actions { display: flex; gap: 8px; }
.tool-btn {
  appearance: none; cursor: pointer;
  background: var(--card); color: var(--text);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 8px 18px; font-size: .85rem;
  transition: border-color .16s ease, color .16s ease;
}
.tool-btn:hover { border-color: var(--accent); color: #cfc6ff; }

/* ============ facts strip ============ */
.facts {
  display: grid; grid-template-columns: repeat(6, 1fr);
  gap: 10px; margin: 26px auto 0; max-width: 920px;
}
.fact {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; text-align: left;
}
.fact .k { font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: 3px; }
.fact .v { font-size: .9rem; font-weight: 600; }

/* ============ sections ============ */
.section { padding: 54px 0 6px; }
.section > h2 { font-size: clamp(1.3rem, 3vw, 1.7rem); margin-bottom: 10px; }
.lede { color: var(--muted); max-width: 800px; margin-bottom: 14px; }
.section p { max-width: 800px; margin-bottom: 12px; }
.section p.lede { margin-bottom: 18px; }

/* core loop */
.loop { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 22px; }
.loop-step {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; position: relative;
}
.loop-step .n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent-2);
  font-weight: 700; font-size: .95rem; margin-bottom: 10px;
}
.loop-step h3 { font-size: 1.02rem; margin-bottom: 4px; }
.loop-step p { color: var(--muted); font-size: .9rem; margin: 0; max-width: none; }

/* steps */
.steps { list-style: none; counter-reset: step; display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 20px; }
.steps li {
  counter-increment: step;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; position: relative;
}
.steps li::before {
  content: counter(step);
  position: absolute; top: -12px; left: 20px;
  background: linear-gradient(135deg, var(--accent), #5d8bff);
  color: #fff; font-weight: 700; font-size: .85rem;
  border-radius: 8px; padding: 2px 11px;
}
.steps h3 { font-size: 1.05rem; margin-bottom: 6px; }
.steps p { color: var(--muted); font-size: .92rem; margin: 0; max-width: none; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 20px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px;
}
.card h3 { font-size: 1.02rem; margin-bottom: 6px; }
.card h3::before { content: "▪ "; color: var(--accent-2); }
.card p { color: var(--muted); font-size: .9rem; margin: 0; max-width: none; }

/* tips */
.tips { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 20px; }
.tip {
  background: linear-gradient(180deg, var(--card-2), var(--card));
  border: 1px solid var(--border); border-left: 3px solid var(--accent-2);
  border-radius: var(--radius); padding: 20px 22px;
}
.tip h3 { font-size: 1.02rem; margin-bottom: 6px; }
.tip p { color: var(--muted); font-size: .92rem; margin: 0; max-width: none; }

/* faq */
.faq {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 4px 20px; margin-bottom: 10px; max-width: 860px;
}
.faq summary {
  cursor: pointer; font-weight: 600; padding: 14px 0; list-style-position: outside;
}
.faq summary::marker { color: var(--accent-2); }
.faq p { color: var(--muted); padding: 0 2px 16px; margin: 0; max-width: none; }

/* ============ footer ============ */
.footer { border-top: 1px solid var(--border); margin-top: 60px; background: var(--bg-soft); }
.foot-in { padding: 30px 20px; display: flex; flex-direction: column; gap: 14px; }
.foot-brand { display: flex; align-items: center; font-weight: 700; gap: 0; }
.foot-links { display: flex; gap: 18px; flex-wrap: wrap; }
.foot-links a { color: var(--muted); font-size: .9rem; }
.foot-links a:hover { color: var(--text); }
.foot-note { color: var(--muted); font-size: .8rem; max-width: none; }

/* ============ responsive ============ */
@media (max-width: 980px) {
  .facts { grid-template-columns: repeat(3, 1fr); }
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 820px) {
  .burger { display: block; }
  .nav-links {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: rgba(11, 16, 32, .97);
    border-bottom: 1px solid var(--border);
    padding: 10px 16px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 12px; }
  .nav-links .nav-cta { margin-left: 0; text-align: center; }
  .nav-links .lang-row { border-left: 0; margin: 6px 0 0; padding: 0; justify-content: center; }
}
@media (max-width: 680px) {
  .hero { padding-top: 30px; }
  .game-frame { aspect-ratio: 4 / 5; max-height: 76vh; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .loop, .cards, .steps, .tips { grid-template-columns: 1fr; }
  .steps li::before { top: -12px; left: 16px; }
}