/* Cubus 官网 · 单页暗色分屏 · 2026-08-06 重设计 */
:root {
  --bg: #04060c;
  --text: #e6eefb;
  --dim: #8291b3;
  --faint: #4a5875;
  --cyan: #62d9ff;
  --blue: #3e86f2;
  --violet: #8b7bff;
  --line: rgba(120, 170, 255, 0.14);
  --card: rgba(12, 19, 36, 0.62);
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --cs: clamp(200px, 24vw, 340px); /* 立方体边长 */
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: inherit; }

/* ---------- 背景层 ---------- */
.bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
.bg-grid {
  position: absolute; inset: -1px;
  background-image:
    linear-gradient(rgba(110, 160, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 160, 255, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 85% at 30% 45%, #000 25%, transparent 80%);
  mask-image: radial-gradient(ellipse 80% 85% at 30% 45%, #000 25%, transparent 80%);
}
.bg-glow { position: absolute; border-radius: 50%; filter: blur(90px); }
.bg-glow-a {
  width: 56vw; height: 56vw; max-width: 760px; max-height: 760px;
  left: -6%; top: 50%; transform: translateY(-50%);
  background: radial-gradient(circle, rgba(62, 134, 242, 0.20), rgba(98, 217, 255, 0.06) 55%, transparent 72%);
}
.bg-glow-b {
  width: 40vw; height: 40vw; max-width: 520px; max-height: 520px;
  right: -8%; bottom: -14%;
  background: radial-gradient(circle, rgba(139, 123, 255, 0.10), transparent 68%);
}
.bg-stars {
  position: absolute; inset: 0;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(230, 240, 255, 0.55), transparent 100%),
    radial-gradient(1px 1px at 78% 14%, rgba(230, 240, 255, 0.4), transparent 100%),
    radial-gradient(1.5px 1.5px at 64% 36%, rgba(98, 217, 255, 0.45), transparent 100%),
    radial-gradient(1px 1px at 31% 58%, rgba(230, 240, 255, 0.32), transparent 100%),
    radial-gradient(1px 1px at 88% 62%, rgba(139, 123, 255, 0.4), transparent 100%),
    radial-gradient(1.5px 1.5px at 44% 82%, rgba(230, 240, 255, 0.28), transparent 100%),
    radial-gradient(1px 1px at 8% 84%, rgba(98, 217, 255, 0.3), transparent 100%),
    radial-gradient(1px 1px at 55% 8%, rgba(230, 240, 255, 0.45), transparent 100%);
}
.bg-vignette {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 120% 95% at 45% 45%, transparent 55%, rgba(2, 3, 8, 0.75) 100%);
}

/* ---------- 分屏布局 ---------- */
.split {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 46% 54%;
  min-height: 100vh;
}

/* ---------- 左：动画场景 ---------- */
.scene-pane {
  position: sticky; top: 0;
  height: 100vh;
  display: flex; align-items: center; justify-content: center;
  border-right: 1px solid rgba(120, 170, 255, 0.08);
  overflow: hidden;
}
.scene {
  position: relative;
  width: calc(var(--cs) * 1.5); height: calc(var(--cs) * 1.5);
  display: flex; align-items: center; justify-content: center;
}
.hud span { position: absolute; width: 24px; height: 24px; border: 0 solid rgba(98, 217, 255, 0.4); }
.hud span:nth-child(1) { top: 0; left: 0; border-top-width: 1px; border-left-width: 1px; }
.hud span:nth-child(2) { top: 0; right: 0; border-top-width: 1px; border-right-width: 1px; }
.hud span:nth-child(3) { bottom: 0; left: 0; border-bottom-width: 1px; border-left-width: 1px; }
.hud span:nth-child(4) { bottom: 0; right: 0; border-bottom-width: 1px; border-right-width: 1px; }
.scene-halo {
  position: absolute; inset: -18%;
  background: radial-gradient(circle, rgba(98, 217, 255, 0.14), rgba(62, 134, 242, 0.06) 48%, transparent 70%);
  animation: halo-pulse 5.2s ease-in-out infinite;
}
.orbit {
  position: absolute; left: 50%; top: 50%;
  border: 1px solid rgba(98, 217, 255, 0.16);
  border-radius: 50%;
}
.orbit::before {
  content: ""; position: absolute; left: 50%; top: -3.5px;
  width: 7px; height: 7px; margin-left: -3.5px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px 3px rgba(98, 217, 255, 0.65);
}
.orbit-a {
  width: calc(var(--cs) * 1.62); height: calc(var(--cs) * 1.62);
  animation: orbit-spin 16s linear infinite;
}
.orbit-b {
  width: calc(var(--cs) * 1.95); height: calc(var(--cs) * 1.95);
  border-color: rgba(139, 123, 255, 0.14);
  animation: orbit-spin-rev 26s linear infinite;
}
.orbit-b::before { background: var(--violet); box-shadow: 0 0 10px 3px rgba(139, 123, 255, 0.55); }
@keyframes orbit-spin {
  from { transform: translate(-50%, -50%) rotateX(72deg) rotateZ(0deg); }
  to   { transform: translate(-50%, -50%) rotateX(72deg) rotateZ(360deg); }
}
@keyframes orbit-spin-rev {
  from { transform: translate(-50%, -50%) rotateX(75deg) rotateZ(360deg); }
  to   { transform: translate(-50%, -50%) rotateX(75deg) rotateZ(0deg); }
}

.cube-scene {
  position: absolute; left: 50%; top: 50%;
  width: var(--cs); height: var(--cs);
  margin: calc(var(--cs) / -2) 0 0 calc(var(--cs) / -2);
  perspective: 1100px;
}
.cube {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  animation: cube-spin 30s linear infinite;
}
.face {
  position: absolute; inset: 0;
  border: 1px solid rgba(98, 217, 255, 0.42);
  background: linear-gradient(135deg, rgba(98, 217, 255, 0.05), rgba(62, 134, 242, 0.015));
  box-shadow: inset 0 0 26px rgba(98, 217, 255, 0.045);
}
.f-front  { transform: translateZ(calc(var(--cs) / 2)); }
.f-back   { transform: rotateY(180deg) translateZ(calc(var(--cs) / 2)); }
.f-right  { transform: rotateY(90deg) translateZ(calc(var(--cs) / 2)); }
.f-left   { transform: rotateY(-90deg) translateZ(calc(var(--cs) / 2)); }
.f-top    { transform: rotateX(90deg) translateZ(calc(var(--cs) / 2)); }
.f-bottom { transform: rotateX(-90deg) translateZ(calc(var(--cs) / 2)); }
@keyframes cube-spin { from { transform: rotateX(-16deg) rotateY(0deg); } to { transform: rotateX(-16deg) rotateY(360deg); } }
@keyframes halo-pulse { 0%, 100% { opacity: 0.72; transform: scale(1); } 50% { opacity: 1; transform: scale(1.05); } }
@keyframes core-pulse { 0%, 100% { opacity: 0.85; } 50% { opacity: 1; } }

.logo-mark {
  position: relative;
  width: calc(var(--cs) * 0.72); height: calc(var(--cs) * 0.72);
  filter: drop-shadow(0 0 22px rgba(98, 217, 255, 0.4)) drop-shadow(0 0 60px rgba(62, 134, 242, 0.25));
  animation: logo-float 6.5s ease-in-out infinite;
}
@keyframes logo-float { 0%, 100% { transform: translateY(-7px); } 50% { transform: translateY(7px); } }

.pane-caption {
  position: absolute; left: 0; right: 0; bottom: clamp(22px, 4vh, 44px);
  text-align: center;
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.5em; text-indent: 0.5em;
  color: var(--faint);
}

/* ---------- 右：内容 ---------- */
.content {
  display: flex; flex-direction: column; justify-content: center;
  padding: clamp(40px, 7vh, 84px) clamp(28px, 5vw, 88px);
  max-width: 860px;
}
.wordmark {
  font-family: var(--mono);
  font-size: clamp(38px, 4.6vw, 62px);
  font-weight: 600;
  letter-spacing: 0.38em;
  background: linear-gradient(100deg, #eaf4ff 10%, var(--cyan) 45%, var(--blue) 72%, var(--violet) 96%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  text-shadow: 0 0 46px rgba(98, 217, 255, 0.28);
}
.cn-mark { margin-top: 10px; font-size: 15px; letter-spacing: 0.75em; color: var(--dim); }
.tagline { margin-top: clamp(12px, 2vh, 20px); font-size: 14px; letter-spacing: 0.28em; color: var(--faint); }

.badges { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: clamp(16px, 2.6vh, 26px); }
.beta-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px;
  border: 1px solid rgba(139, 123, 255, 0.32); border-radius: 999px;
  background: rgba(18, 14, 40, 0.55);
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.22em; text-indent: 0.1em;
  color: var(--violet);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.beta-badge__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 8px 2px rgba(139, 123, 255, 0.6);
  animation: core-pulse 2.6s ease-in-out infinite;
}
.version-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px;
  border: 1px solid var(--line); border-radius: 999px;
  background: rgba(10, 16, 30, 0.55);
  font-family: var(--mono); font-size: 12.5px; color: var(--dim);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.version-badge__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px 2px rgba(98, 217, 255, 0.65);
  animation: core-pulse 2.6s ease-in-out infinite;
}

/* ---------- 下载列表 ---------- */
.dl-list {
  display: flex; flex-direction: column; gap: 13px;
  margin-top: clamp(26px, 4.5vh, 44px);
}
.dl-card {
  position: relative;
  display: flex; align-items: center; gap: 20px;
  padding: 17px 20px;
  border: 1px solid rgba(120, 170, 255, 0.12);
  border-radius: 13px;
  background: var(--card);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.dl-card:hover {
  transform: translateY(-2px);
  border-color: rgba(98, 217, 255, 0.38);
  box-shadow: 0 12px 38px rgba(3, 8, 20, 0.6), 0 0 30px rgba(62, 134, 242, 0.12);
}
.dl-card.is-highlight {
  border-color: rgba(98, 217, 255, 0.45);
  box-shadow: 0 0 0 1px rgba(98, 217, 255, 0.18), 0 0 38px rgba(62, 134, 242, 0.16);
}
.pill {
  display: none;
  position: absolute; top: -10px; left: 18px;
  padding: 2px 11px; border-radius: 999px;
  font-size: 11px; letter-spacing: 0.14em; white-space: nowrap;
  color: #04121e;
  background: linear-gradient(95deg, var(--cyan), var(--blue));
  box-shadow: 0 0 16px rgba(98, 217, 255, 0.4);
}
.dl-card.is-highlight .pill { display: inline-block; }
.dl-head { flex: 0 0 175px; min-width: 0; }
.os { font-size: 15.5px; font-weight: 600; letter-spacing: 0.02em; }
.arch-t { margin-top: 3px; font-size: 12px; color: var(--dim); letter-spacing: 0.03em; }
.meta {
  flex: 1 1 auto; min-width: 0;
  display: flex; flex-wrap: wrap; column-gap: 22px; row-gap: 4px;
  font-family: var(--mono); font-size: 12px;
}
.meta .row { display: flex; gap: 8px; white-space: nowrap; }
.meta .row span { color: var(--faint); }
.meta .row b { font-weight: 500; color: var(--dim); overflow: hidden; text-overflow: ellipsis; }
.dl-card.is-ok .meta .row b { color: var(--text); }
.dl-card.is-error .meta .row b { color: #e08b8b; }

.btn {
  flex: 0 0 auto;
  padding: 10px 22px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 9px; border: 1px solid transparent;
  font-size: 13.5px; font-weight: 600; letter-spacing: 0.06em;
  text-decoration: none; cursor: pointer;
  color: #04121e;
  background: linear-gradient(95deg, var(--cyan), var(--blue));
  box-shadow: 0 4px 22px rgba(62, 134, 242, 0.28);
  transition: filter 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}
.btn:hover { filter: brightness(1.12); box-shadow: 0 6px 28px rgba(98, 217, 255, 0.35); }
.btn[aria-disabled="true"] { opacity: 0.35; pointer-events: none; filter: saturate(0.4); }
.btn-ghost {
  color: var(--text);
  background: rgba(16, 24, 44, 0.6);
  border-color: rgba(120, 170, 255, 0.22);
  box-shadow: none;
}
.btn-ghost:hover { filter: none; border-color: rgba(98, 217, 255, 0.45); box-shadow: 0 0 20px rgba(62, 134, 242, 0.16); }

/* 同步助手行 */
.dl-tool { border-color: rgba(139, 123, 255, 0.14); }
.dl-tool__tag {
  display: inline-block; margin-bottom: 5px;
  padding: 1.5px 8px; border-radius: 999px;
  border: 1px solid rgba(139, 123, 255, 0.35);
  color: var(--violet);
  font-size: 10.5px; letter-spacing: 0.14em;
}

/* ---------- 备注 / 页脚 ---------- */
.dl-fallback { margin-top: 16px; font-size: 13px; color: #e08b8b; }
.dl-fallback a { color: var(--cyan); }
.dl-note {
  margin-top: 16px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.05em;
  color: var(--faint);
}
.footer {
  margin-top: clamp(26px, 5vh, 52px);
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em;
  color: var(--faint);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .dl-head { flex-basis: 150px; }
  .meta { column-gap: 14px; }
}
@media (max-width: 960px) {
  .split { grid-template-columns: 1fr; }
  .scene-pane {
    position: relative; height: auto;
    min-height: 46vh;
    padding: 40px 0 30px;
    border-right: 0; border-bottom: 1px solid rgba(120, 170, 255, 0.08);
  }
  :root { --cs: clamp(160px, 38vw, 240px); }
  .content { max-width: 640px; margin: 0 auto; width: 100%; }
  .pane-caption { bottom: 12px; }
}
@media (max-width: 640px) {
  .dl-card { flex-wrap: wrap; gap: 12px; padding: 16px 18px; }
  .dl-head { flex: 1 1 auto; }
  .meta { flex-basis: 100%; order: 3; }
  .btn { flex: 0 0 auto; order: 2; }
}

/* 入场后静置定格：JS 约 12s 后（或页面隐藏时）给 <html> 加 .calm，
   重型装饰动画停止出帧，仅保留徽章小点呼吸 */
.calm .cube, .calm .scene-halo, .calm .orbit-a, .calm .orbit-b { animation-play-state: paused; }
.calm .logo-mark { animation: none; }

@media (prefers-reduced-motion: reduce) {
  .cube, .scene-halo, .orbit-a, .orbit-b, .logo-mark,
  .version-badge__dot, .beta-badge__dot { animation: none; }
  .dl-card, .btn { transition: none; }
}