/* ============================================================
   天堂 官网样式
   深色主题 · 圆角卡片 · 响应式
   ============================================================ */

:root {
  --bg: #0a0d14;
  --bg-alt: #0d1119;
  --panel: rgba(255, 255, 255, 0.04);
  --panel-hover: rgba(255, 255, 255, 0.065);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e9edf6;
  --text-muted: #8f98ad;
  --text-dim: #6b7385;
  --accent: #4ea1ff;
  --accent-2: #7c5cff;
  --accent-grad: linear-gradient(135deg, #4ea1ff 0%, #7c5cff 100%);
  --ok: #35d07f;
  --warn: #f5b544;
  --radius-xl: 26px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  --container: 1160px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.25; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
code {
  font-family: "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 0.88em;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 6px;
  padding: 2px 7px;
  color: #b8d4ff;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: var(--accent-grad);
  z-index: 120;
  transition: width 0.1s linear;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 11px 22px;
  font-weight: 600;
  font-size: 15px;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), background 0.25s, box-shadow 0.25s, border-color 0.25s;
  border: 1px solid transparent;
}

.btn .ico { width: 18px; height: 18px; flex: none; }

.btn-primary {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 10px 26px rgba(78, 161, 255, 0.28);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(124, 92, 255, 0.4);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.28);
  transform: translateY(-2px);
}

.btn-lg { padding: 14px 30px; font-size: 16px; }
.btn-sm { padding: 8px 16px; font-size: 13.5px; }
.btn-block { width: 100%; }

/* ---------- 导航栏 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.3s, backdrop-filter 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 13, 20, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}
.brand-logo {
  width: 38px; height: 38px;
  display: block;
  border-radius: 11px;
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(78, 161, 255, 0.32);
}
.brand-logo svg { width: 100%; height: 100%; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; letter-spacing: 0.02em; }
.brand-text small { font-size: 11px; color: var(--text-dim); letter-spacing: 0.16em; }

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-link {
  position: relative;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--text-muted);
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav-link.active { color: var(--text); background: rgba(255, 255, 255, 0.08); }
.nav-cta { margin-left: 10px; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 18px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.28s var(--ease), opacity 0.2s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: 168px 0 110px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}
.orb-1 {
  width: 520px; height: 520px;
  background: radial-gradient(circle, rgba(78, 161, 255, 0.55), transparent 65%);
  top: -140px; left: -80px;
  animation: float 14s ease-in-out infinite;
}
.orb-2 {
  width: 460px; height: 460px;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.45), transparent 65%);
  top: 40px; right: -120px;
  animation: float 18s ease-in-out infinite reverse;
}
.grid-lines {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 78%);
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(24px, -26px); }
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(78, 161, 255, 0.32);
  background: rgba(78, 161, 255, 0.09);
  font-size: 13.5px;
  color: #bcd8ff;
}
.pill .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 0 rgba(53, 208, 127, 0.6);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(53, 208, 127, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(53, 208, 127, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 208, 127, 0); }
}

.hero h1 {
  margin: 22px 0 20px;
  font-size: clamp(34px, 4.3vw, 54px);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.grad-text {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  max-width: 500px;
  color: var(--text-muted);
  font-size: 16.5px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 34px 0 42px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  row-gap: 18px;
  column-gap: 0;
  list-style: none;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}
.hero-meta li {
  display: flex;
  flex-direction: column;
  padding-right: 42px;
  margin-right: 42px;
  border-right: 1px solid var(--border);
}
.hero-meta li:last-child { border-right: none; padding-right: 0; margin-right: 0; }
.hero-meta strong { font-size: 20px; font-weight: 700; }
.hero-meta span { font-size: 12.5px; color: var(--text-dim); letter-spacing: 0.06em; }

/* 首屏右侧窗口示意 */
.hero-visual { perspective: 1200px; }
.window-card {
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-strong);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow);
  overflow: hidden;
  transform: rotateY(-8deg) rotateX(3deg);
  transition: transform 0.6s var(--ease);
  backdrop-filter: blur(6px);
}
.window-card:hover { transform: rotateY(0) rotateX(0) translateY(-4px); }

.window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}
.win-dot { width: 10px; height: 10px; border-radius: 50%; }
.win-dot.red { background: #ff5f57; }
.win-dot.yellow { background: #febc2e; }
.win-dot.green { background: #28c840; }
.window-title {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

.window-body { padding: 22px; }
.fake-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  margin-bottom: 10px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  font-size: 13.5px;
}
.fake-label { color: var(--text-muted); }
.fake-value { color: #c8d6ee; }
.tag-ok {
  font-size: 12px;
  color: #8af0bb;
  background: rgba(53, 208, 127, 0.14);
  border: 1px solid rgba(53, 208, 127, 0.3);
  padding: 2px 10px;
  border-radius: 999px;
}
.fake-chart {
  display: flex;
  align-items: flex-end;
  gap: 7px;
  height: 96px;
  margin: 18px 0 16px;
  padding: 0 4px;
}
.fake-chart span {
  flex: 1;
  height: var(--h);
  border-radius: 6px 6px 3px 3px;
  background: linear-gradient(180deg, rgba(124, 92, 255, 0.95), rgba(78, 161, 255, 0.35));
  animation: grow 1.2s var(--ease) backwards;
}
.fake-chart span:nth-child(2n) { animation-delay: 0.08s; }
.fake-chart span:nth-child(3n) { animation-delay: 0.16s; }
@keyframes grow { from { height: 0; opacity: 0.2; } }

.fake-footer {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.pulse {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ok);
  animation: pulse-dot 2s infinite;
}

/* ---------- 通用区块 ---------- */
.section { padding: 104px 0; }
.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 58px;
}
.kicker {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-head h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 750;
  margin-bottom: 14px;
}
.section-head p { color: var(--text-muted); font-size: 15.5px; }

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  padding: 30px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--panel);
  transition: transform 0.35s var(--ease), background 0.35s, border-color 0.35s, box-shadow 0.35s;
}
.feature-card:hover {
  transform: translateY(-6px);
  background: var(--panel-hover);
  border-color: rgba(78, 161, 255, 0.34);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}
.feature-icon {
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: rgba(78, 161, 255, 0.12);
  border: 1px solid rgba(78, 161, 255, 0.22);
  color: #7fc0ff;
  margin-bottom: 20px;
}
.feature-icon svg { width: 22px; height: 22px; }
.feature-card h3 { font-size: 18px; margin-bottom: 9px; }
.feature-card p { color: var(--text-muted); font-size: 14.5px; line-height: 1.75; }

/* ---------- 下载区 ---------- */
.download-wrap { max-width: 900px; margin: 0 auto; }

.tabs {
  display: flex;
  justify-content: center;
  gap: 6px;
  padding: 6px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  width: fit-content;
  margin: 0 auto 30px;
}
.tab {
  padding: 9px 24px;
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--text-muted);
  transition: color 0.22s, background 0.22s;
}
.tab:hover { color: var(--text); }
.tab.active {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 8px 22px rgba(78, 161, 255, 0.28);
}

.download-panel { display: none; }
.download-panel.active { display: block; animation: fadeUp 0.45s var(--ease); }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.dl-card {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 26px;
  padding: 32px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-strong);
  background:
    radial-gradient(120% 120% at 0% 0%, rgba(78, 161, 255, 0.1), transparent 55%),
    var(--panel);
  box-shadow: var(--shadow);
}
.dl-main { min-width: 0; }
.dl-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}
.dl-title { display: flex; align-items: center; gap: 15px; }
.dl-os {
  width: 42px; height: 42px;
  flex: none;
  color: #8ec4ff;
  background: rgba(78, 161, 255, 0.1);
  border: 1px solid rgba(78, 161, 255, 0.22);
  border-radius: var(--radius-md);
  padding: 9px;
}
.dl-title h3 { font-size: 21px; }
.dl-title p { font-size: 13.5px; color: var(--text-dim); margin-top: 3px; }

.tag-recommend, .tag-beta {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}
.tag-recommend {
  color: #9ef5c4;
  background: rgba(53, 208, 127, 0.12);
  border: 1px solid rgba(53, 208, 127, 0.28);
}
.tag-beta {
  color: #ffd79a;
  background: rgba(245, 181, 68, 0.12);
  border: 1px solid rgba(245, 181, 68, 0.28);
}

.dl-specs {
  list-style: none;
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}
.dl-specs li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-size: 13.5px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--border);
}
.dl-specs span { color: var(--text-muted); }
.dl-specs code { background: none; padding: 0; color: #cfe1ff; }

.dl-actions { display: grid; gap: 12px; }
.dl-hint { font-size: 12.5px; color: var(--text-dim); text-align: center; }
.beta-note {
  font-size: 14px;
  color: var(--text-muted);
  background: rgba(245, 181, 68, 0.07);
  border: 1px solid rgba(245, 181, 68, 0.2);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 24px;
}

.dl-side {
  border-left: 1px solid var(--border);
  padding-left: 26px;
}
.dl-side h4 {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 12px;
  font-weight: 600;
}
.dl-side h4:not(:first-child) { margin-top: 24px; }

.check-list { list-style: none; display: grid; gap: 8px; }
.check-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--text-muted);
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 3px; top: 8px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}

.hash-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--border);
}
.hash-row code {
  flex: 1;
  background: none;
  padding: 0;
  font-size: 11.5px;
  color: var(--text-dim);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.copy-btn {
  font-size: 12.5px;
  padding: 4px 10px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); background: rgba(78, 161, 255, 0.1); }

/* 时间线 */
.timeline {
  position: relative;
  padding: 8px 0 8px 30px;
  max-width: 720px;
  margin: 0 auto;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 16px; bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent), rgba(124, 92, 255, 0.1));
}
.tl-item { position: relative; padding-bottom: 30px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-dot {
  position: absolute;
  left: -30px; top: 8px;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}
.tl-content {
  padding: 18px 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--panel);
}
.tl-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}
.tl-head strong { font-size: 16px; color: #a8cbff; }
.tl-head span { font-size: 12.5px; color: var(--text-dim); }
.tl-content ul { padding-left: 18px; color: var(--text-muted); font-size: 14px; }

/* ---------- 教程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}
.step {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.step:hover { transform: translateY(-4px); border-color: rgba(124, 92, 255, 0.36); }
.step-num {
  position: absolute;
  right: 18px; top: 8px;
  font-size: 56px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.045);
  letter-spacing: -0.04em;
}
.step h3 { font-size: 17.5px; margin-bottom: 8px; }
.step p { font-size: 14.5px; color: var(--text-muted); }

.video-card {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-strong);
  background: var(--panel);
  overflow: hidden;
  margin-bottom: 34px;
}
.video-poster {
  position: relative;
  display: grid;
  place-items: center;
  gap: 16px;
  padding: 60px 30px;
  min-height: 260px;
  background:
    radial-gradient(80% 120% at 30% 20%, rgba(124, 92, 255, 0.28), transparent 60%),
    radial-gradient(80% 120% at 80% 80%, rgba(78, 161, 255, 0.22), transparent 60%),
    #0b0f18;
  border-right: 1px solid var(--border);
  transition: filter 0.3s;
}
.video-poster::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.video-poster:hover { filter: brightness(1.18); }
.play-btn {
  width: 74px; height: 74px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 14px 40px rgba(78, 161, 255, 0.45);
  transition: transform 0.3s var(--ease);
  position: relative;
  z-index: 1;
}
.play-btn svg { width: 28px; height: 28px; margin-left: 3px; }
.video-poster:hover .play-btn { transform: scale(1.08); }
.video-caption {
  position: relative;
  z-index: 1;
  font-size: 14px;
  color: #cbd9f0;
  letter-spacing: 0.04em;
}
.video-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 36px;
}
.video-info h3 { font-size: 22px; margin-bottom: 12px; }
.video-info p { color: var(--text-muted); font-size: 14.5px; }

/* ---------- 折叠面板 ---------- */
.accordion {
  display: grid;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
}
.acc-item {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.25s, background 0.25s;
}
.acc-item.open {
  border-color: rgba(78, 161, 255, 0.3);
  background: rgba(78, 161, 255, 0.05);
}
.acc-head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  text-align: left;
  font-size: 15.5px;
  font-weight: 500;
  transition: color 0.2s;
}
.acc-head:hover { color: #9dc6ff; }
.acc-arrow {
  width: 18px; height: 18px;
  flex: none;
  color: var(--text-dim);
  transition: transform 0.3s var(--ease), color 0.2s;
}
.acc-item.open .acc-arrow { transform: rotate(180deg); color: var(--accent); }
.acc-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.32s var(--ease);
}
.acc-item.open .acc-body { grid-template-rows: 1fr; }
.acc-inner {
  overflow: hidden;
  padding: 0 22px;
  color: var(--text-muted);
  font-size: 14.5px;
}
.acc-item.open .acc-inner { padding-bottom: 20px; }
.acc-inner ol { padding-left: 20px; display: grid; gap: 6px; }

/* ---------- 联系 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.contact-card {
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--panel);
  transition: transform 0.35s var(--ease), border-color 0.35s;
}
.contact-card:hover { transform: translateY(-5px); border-color: rgba(78, 161, 255, 0.34); }
.contact-card h3 { font-size: 17px; margin-bottom: 6px; }
.contact-value {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #cfe1ff;
  margin-bottom: 18px;
  word-break: break-all;
}
.contact-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.qr-box {
  width: 132px; height: 132px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-strong);
  background: rgba(255, 255, 255, 0.03);
}
.qr-box img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius-md); }
.qr-placeholder { font-size: 12.5px; color: var(--text-dim); }

/* ---------- 公告 ---------- */
.notice-section { padding: 0 0 64px; }
.notice-list {
  display: grid;
  gap: 12px;
  max-width: 820px;
  margin: 0 auto;
}
.notice-item {
  display: flex;
  gap: 16px;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(78, 161, 255, 0.22);
  background: rgba(78, 161, 255, 0.06);
}
.notice-badge {
  flex: none;
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-grad);
  color: #fff;
  font-size: 11.5px;
  letter-spacing: 0.06em;
}
.notice-body { min-width: 0; }
.notice-body h3 { font-size: 15.5px; margin-bottom: 4px; }
.notice-body p {
  font-size: 14px;
  color: var(--text-muted);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.notice-body time { display: block; margin-top: 6px; font-size: 12px; color: var(--text-dim); }

/* ---------- 历史版本 ---------- */
.apk-list-title { font-size: 17px; margin-bottom: 16px; }
.apk-list { display: grid; gap: 10px; }
.apk-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.035);
}
.apk-item-info strong { font-size: 15px; }
.apk-item-info span { display: block; font-size: 12.5px; color: var(--text-dim); }
.apk-item a { font-size: 13.5px; color: #7fc0ff; white-space: nowrap; }
.empty-text { font-size: 14px; color: var(--text-dim); }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 46px 0 38px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 28px;
  align-items: start;
}
.footer-brand strong { font-size: 17px; }
.footer-brand p { font-size: 13.5px; color: var(--text-dim); margin-top: 6px; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  justify-content: flex-end;
  font-size: 14px;
  color: var(--text-muted);
}
.footer-links a { transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-copy {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 22px;
  font-size: 12.5px;
  color: var(--text-dim);
}

/* ---------- 弹窗 ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: none;
  place-items: center;
  padding: 24px;
}
.modal.open { display: grid; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 6, 11, 0.78);
  backdrop-filter: blur(6px);
}
.modal-dialog {
  position: relative;
  width: min(880px, 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  background: #0d1119;
  padding: 14px;
  box-shadow: var(--shadow);
  animation: fadeUp 0.32s var(--ease);
}
.modal-close {
  position: absolute;
  top: -14px; right: -14px;
  width: 38px; height: 38px;
  border-radius: 50%;
  background: #161c28;
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 20px;
  line-height: 1;
  display: grid;
  place-items: center;
  transition: background 0.2s, transform 0.2s;
}
.modal-close:hover { background: #1f2736; transform: rotate(90deg); }
.modal-video {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #070a10;
  display: grid;
  place-items: center;
}
.modal-video iframe { width: 100%; height: 100%; border: 0; display: block; }
.modal-video video { width: 100%; height: 100%; display: block; background: #000; }
.modal-tip {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.9;
}

/* ---------- 提示 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translate(-50%, 20px);
  padding: 11px 22px;
  border-radius: 999px;
  background: rgba(22, 28, 40, 0.95);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 13.5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s var(--ease);
  z-index: 300;
  box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 滚动进场 ---------- */
/* 默认可见，由 JS 给首屏以下的元素加 .pending 才隐藏，避免脚本失效时内容不可见 */
.reveal {
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.pending {
  opacity: 0;
  transform: translateY(22px);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding: 140px 0 80px; }
  .hero-visual { max-width: 560px; }
  .window-card { transform: none; }
  .dl-card { grid-template-columns: 1fr; padding: 26px; }
  .dl-side {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 24px;
  }
  .video-card { grid-template-columns: 1fr; }
  .video-poster { border-right: none; border-bottom: 1px solid var(--border); min-height: 220px; }
}

@media (max-width: 860px) {
  .nav {
    position: fixed;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 24px 26px;
    background: rgba(10, 13, 20, 0.97);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, transform 0.25s var(--ease), visibility 0.25s;
  }
  .nav.open { opacity: 1; transform: none; visibility: visible; }
  .nav-link { padding: 12px 14px; border-radius: var(--radius-sm); font-size: 15.5px; }
  .nav-cta { margin: 10px 0 0; }
  .nav-toggle { display: flex; }

  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 620px) {
  .container { padding: 0 18px; }
  .hero { padding: 124px 0 64px; }
  .hero-meta li { padding-right: 20px; margin-right: 20px; }
  .hero-meta strong { font-size: 17px; }
  .section { padding: 74px 0; }
  .section-head { margin-bottom: 40px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { padding: 24px 22px; }
  .tabs { width: 100%; }
  .tab { flex: 1; padding: 9px 8px; font-size: 13.5px; text-align: center; }
  .dl-card { padding: 22px; }
  .dl-title h3 { font-size: 18px; }
  .video-info { padding: 28px 24px; }
  .video-poster { min-height: 190px; padding: 44px 20px; }
  .acc-head { padding: 16px 18px; font-size: 14.5px; }
  .acc-inner { padding: 0 18px; }
  .modal-close { top: 8px; right: 8px; }
  .hero-actions .btn { width: 100%; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal.pending { opacity: 1; transform: none; }
}