/* ============================================================
   0. 变量与重置
   ============================================================ */
:root {
  /* 鼠标视差偏移量：-1 ~ 1，由 JS 动态写入 */
  --mx: 0;
  --my: 0;

  --bg-dark: #090a0f;
  --bg-mid: #1b2735;

  --text: #ffffff;
  --text-dim: rgba(255, 255, 255, 0.45);
  --text-faint: rgba(255, 255, 255, 0.22);

  --hue-bili: 200;
  --hue-video: 340;
  --hue-win: 152;
  --hue-back: 210;

  --nav-h: 68px;
  --ease-out: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: radial-gradient(ellipse at bottom, var(--bg-mid) 0%, var(--bg-dark) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
svg { display: block; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.14);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.24); }

/* ============================================================
   1. 星空背景（视差跟随鼠标）
   ============================================================ */
.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.stars::before,
.stars::after {
  content: '';
  position: absolute;
  top: -40px;
  left: -40px;
  width: calc(100% + 80px);
  height: calc(100% + 80px);
  background-image:
    radial-gradient(2px 2px at 20px 30px, #fff, transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
    radial-gradient(2px 2px at 50px 160px, #fff, transparent),
    radial-gradient(2px 2px at 90px 40px, rgba(255,255,255,0.6), transparent),
    radial-gradient(2px 2px at 130px 80px, #fff, transparent),
    radial-gradient(2px 2px at 160px 120px, rgba(255,255,255,0.7), transparent),
    radial-gradient(2px 2px at 200px 50px, #fff, transparent),
    radial-gradient(2px 2px at 250px 190px, rgba(255,255,255,0.5), transparent),
    radial-gradient(2px 2px at 300px 100px, #fff, transparent),
    radial-gradient(2px 2px at 350px 30px, rgba(255,255,255,0.9), transparent),
    radial-gradient(2px 2px at 400px 170px, #fff, transparent),
    radial-gradient(2px 2px at 450px 60px, rgba(255,255,255,0.6), transparent);
  background-size: 500px 200px;
  background-repeat: repeat;
  will-change: transform, opacity;
}

/* 远层：位移幅度小 */
.stars::before {
  animation: twinkle 4s ease-in-out infinite alternate;
  transform: translate3d(calc(var(--mx) * 16px), calc(var(--my) * 16px), 0);
}

/* 近层：位移幅度大，形成纵深 */
.stars::after {
  background-size: 350px 140px;
  opacity: 0.5;
  animation: twinkle 6s ease-in-out infinite alternate;
  animation-delay: 1s;
  transform: translate3d(calc(var(--mx) * 32px), calc(var(--my) * 32px), 0);
}

@keyframes twinkle {
  0%   { opacity: 0.4; }
  100% { opacity: 1; }
}

/* ============================================================
   2. 导航栏
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(10, 14, 22, 0.55);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.nav-inner {
  max-width: 1080px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #00a1d6, #0066a1);
  box-shadow: 0 0 18px rgba(0, 161, 214, 0.4);
}

.logo-text {
  font-size: 1.02rem;
  background: linear-gradient(135deg, #ffffff 0%, #a8d8ea 60%, #00a1d6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
  border-radius: 10px;
  transition: color 0.25s, background 0.25s;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
}

.nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, #00a1d6, #a8d8ea);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 10px;
  transition: background 0.25s;
}

.nav-toggle:hover { background: rgba(255, 255, 255, 0.08); }

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.85);
  transition: transform 0.3s var(--ease-out), opacity 0.25s;
}

.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); }

/* ============================================================
   3. 页面容器与视图切换
   ============================================================ */
.site {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 56px) 24px 80px;
}

.page { display: none; }

.page.active {
  display: block;
  animation: fadeUp 0.65s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   4. Hero 区域
   ============================================================ */
.hero {
  text-align: center;
  padding: 24px 0 64px;
}

.hero-avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 38px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  background: linear-gradient(135deg, #00a1d6, #0066a1, #1b2735);
  box-shadow:
    0 0 0 3px rgba(0, 161, 214, 0.18),
    0 0 40px rgba(0, 161, 214, 0.22);
  user-select: none;
}

.hero-title {
  font-size: clamp(2.1rem, 6vw, 3.1rem);
  font-weight: 700;
  letter-spacing: 1.5px;
  line-height: 1.15;
  margin-bottom: 10px;
  background: linear-gradient(135deg, #ffffff 0%, #a8d8ea 55%, #00a1d6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(0.85rem, 2.4vw, 1rem);
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 22px;
}

.hero-desc {
  max-width: 520px;
  margin: 0 auto 40px;
  font-size: 0.98rem;
  color: rgba(255, 255, 255, 0.55);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

/* ============================================================
   5. 液态玻璃按钮
   ============================================================ */
.btn-liquid {
  --hue: 200;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 30px;
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: #fff;
  cursor: pointer;
  border-radius: 60px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  isolation: isolate;
  overflow: hidden;
  white-space: nowrap;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.35);
  background: linear-gradient(
    145deg,
    hsla(var(--hue), 100%, 92%, 0.28) 0%,
    hsla(var(--hue), 90%, 75%, 0.14) 30%,
    hsla(var(--hue), 85%, 60%, 0.10) 55%,
    hsla(var(--hue), 80%, 70%, 0.18) 100%
  );
  backdrop-filter: blur(22px) saturate(200%);
  -webkit-backdrop-filter: blur(22px) saturate(200%);
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.32),
    inset 0 2px 6px rgba(255, 255, 255, 0.42),
    inset 0 -3px 10px hsla(var(--hue), 100%, 70%, 0.22),
    inset 0 0 24px rgba(255, 255, 255, 0.06),
    0 0 26px hsla(var(--hue), 95%, 65%, 0.20);
  transition:
    transform 0.35s var(--ease-out),
    box-shadow 0.35s ease,
    filter 0.35s ease,
    border-color 0.35s ease;
}

/* 内部液态光斑 */
.btn-liquid::before,
.btn-liquid::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.btn-liquid::before {
  width: 160px;
  height: 160px;
  top: -70px;
  left: -40px;
  background: radial-gradient(circle,
    hsla(var(--hue), 100%, 85%, 0.75) 0%,
    hsla(var(--hue), 100%, 75%, 0.25) 40%,
    transparent 72%);
  filter: blur(22px);
  animation: liquidFlow1 9s ease-in-out infinite alternate;
}

.btn-liquid::after {
  width: 150px;
  height: 150px;
  bottom: -70px;
  right: -40px;
  background: radial-gradient(circle,
    hsla(calc(var(--hue) + 40), 100%, 82%, 0.6) 0%,
    hsla(calc(var(--hue) + 40), 100%, 72%, 0.18) 42%,
    transparent 72%);
  filter: blur(24px);
  animation: liquidFlow2 11s ease-in-out infinite alternate;
}

@keyframes liquidFlow1 {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(80px, 40px) scale(1.25); }
  100% { transform: translate(30px, 80px) scale(0.95); }
}

@keyframes liquidFlow2 {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(-70px, -30px) scale(1.2); }
  100% { transform: translate(-30px, -70px) scale(0.9); }
}

.btn-liquid > * { position: relative; z-index: 1; }

.btn-liquid svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
  flex-shrink: 0;
  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.3));
}

.btn-liquid:hover {
  border-color: rgba(255, 255, 255, 0.45);
  filter: brightness(1.15) saturate(1.1);
  transform: translateY(-3px) scale(1.015);
  box-shadow:
    0 16px 40px rgba(0, 0, 0, 0.38),
    inset 0 2px 8px rgba(255, 255, 255, 0.6),
    inset 0 -3px 12px hsla(var(--hue), 100%, 75%, 0.3),
    inset 0 0 30px rgba(255, 255, 255, 0.1),
    0 0 42px hsla(var(--hue), 95%, 68%, 0.45);
}

.btn-liquid:hover::before,
.btn-liquid:hover::after {
  filter: blur(18px) brightness(1.3);
  animation-duration: 4s;
}

.btn-liquid:active {
  transform: translateY(-1px) scale(0.985);
  filter: brightness(0.95) saturate(1.05);
  box-shadow:
    0 5px 16px rgba(0, 0, 0, 0.35),
    inset 0 3px 12px rgba(0, 0, 0, 0.22),
    inset 0 1px 4px rgba(255, 255, 255, 0.3),
    0 0 20px hsla(var(--hue), 90%, 65%, 0.25);
}

/* 色调 */
.hue-bili  { --hue: var(--hue-bili); }
.hue-video { --hue: var(--hue-video); }
.hue-win   { --hue: var(--hue-win); }

/* ============================================================
   6. 功能卡片
   ============================================================ */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.feature-card {
  --hue: 200;
  position: relative;
  padding: 26px 24px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(
    145deg,
    hsla(var(--hue), 95%, 90%, 0.12) 0%,
    hsla(var(--hue), 85%, 70%, 0.05) 45%,
    hsla(var(--hue), 80%, 65%, 0.09) 100%
  );
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  box-shadow:
    0 6px 20px rgba(0, 0, 0, 0.22),
    inset 0 2px 5px rgba(255, 255, 255, 0.2),
    inset 0 -2px 8px hsla(var(--hue), 100%, 70%, 0.1);
  transition:
    transform 0.35s var(--ease-out),
    box-shadow 0.35s ease,
    filter 0.35s ease,
    border-color 0.35s ease;
}

.feature-card::before {
  content: '';
  position: absolute;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  top: -60px;
  left: -30px;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle,
    hsla(var(--hue), 100%, 85%, 0.4) 0%,
    transparent 70%);
  filter: blur(20px);
  animation: liquidFlow1 10s ease-in-out infinite alternate;
}

.feature-card > * { position: relative; z-index: 1; }

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: inset 0 1px 3px rgba(255, 255, 255, 0.28);
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  color: hsla(var(--hue), 90%, 82%, 1);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.feature-card p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.7;
}

.feature-card:hover {
  border-color: rgba(255, 255, 255, 0.32);
  filter: brightness(1.12);
  transform: translateY(-4px);
  box-shadow:
    0 14px 32px rgba(0, 0, 0, 0.32),
    inset 0 2px 7px rgba(255, 255, 255, 0.36),
    0 0 32px hsla(var(--hue), 95%, 68%, 0.3);
}

.feature-card:active {
  transform: translateY(-1px) scale(0.99);
  filter: brightness(0.96);
}

/* ============================================================
   7. Windows 下载页
   ============================================================ */
.page-windows {
  max-width: 680px;
  margin: 0 auto;
}

.page-head {
  text-align: center;
  margin-bottom: 34px;
}

.back-btn {
  --hue: var(--hue-back);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px 9px 14px;
  margin-bottom: 26px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  border-radius: 40px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  isolation: isolate;
  overflow: hidden;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
  background: linear-gradient(
    145deg,
    hsla(var(--hue), 100%, 92%, 0.22) 0%,
    hsla(var(--hue), 90%, 75%, 0.10) 45%,
    hsla(var(--hue), 80%, 70%, 0.16) 100%
  );
  backdrop-filter: blur(18px) saturate(190%);
  -webkit-backdrop-filter: blur(18px) saturate(190%);
  box-shadow:
    0 6px 18px rgba(0, 0, 0, 0.3),
    inset 0 2px 5px rgba(255, 255, 255, 0.35),
    inset 0 -2px 8px hsla(var(--hue), 100%, 70%, 0.18);
  transition:
    transform 0.3s var(--ease-out),
    box-shadow 0.3s ease,
    filter 0.3s ease,
    border-color 0.3s ease;
}

.back-btn::before {
  content: '';
  position: absolute;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  top: -40px;
  left: -20px;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle,
    hsla(var(--hue), 100%, 85%, 0.55) 0%,
    transparent 70%);
  filter: blur(16px);
  animation: liquidFlow1 8s ease-in-out infinite alternate;
}

.back-btn > * { position: relative; z-index: 1; }

.back-btn svg { width: 15px; height: 15px; }

.back-btn:hover {
  border-color: rgba(255, 255, 255, 0.42);
  filter: brightness(1.18);
  transform: translateX(-3px);
  box-shadow:
    0 10px 26px rgba(0, 0, 0, 0.36),
    inset 0 2px 6px rgba(255, 255, 255, 0.5),
    0 0 28px hsla(var(--hue), 95%, 68%, 0.4);
}

.back-btn:active {
  transform: translateX(-1px) scale(0.97);
  filter: brightness(0.94);
}

.page-title {
  font-size: clamp(1.6rem, 4.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #ffffff 0%, #a7f3d0 60%, #34d399 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-sub {
  font-size: 0.82rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.dl-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dl-item {
  --hue: var(--hue-win);
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #fff;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(
    145deg,
    hsla(var(--hue), 95%, 90%, 0.14) 0%,
    hsla(var(--hue), 85%, 70%, 0.06) 45%,
    hsla(var(--hue), 80%, 65%, 0.10) 100%
  );
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  box-shadow:
    0 6px 20px rgba(0, 0, 0, 0.24),
    inset 0 2px 5px rgba(255, 255, 255, 0.22),
    inset 0 -2px 8px hsla(var(--hue), 100%, 70%, 0.12);
  transition:
    transform 0.3s var(--ease-out),
    box-shadow 0.3s ease,
    filter 0.3s ease,
    border-color 0.3s ease;
}

.dl-item::before {
  content: '';
  position: absolute;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  top: -60px;
  left: -30px;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle,
    hsla(var(--hue), 100%, 85%, 0.45) 0%,
    transparent 70%);
  filter: blur(20px);
  animation: liquidFlow1 10s ease-in-out infinite alternate;
}

.dl-item > * { position: relative; z-index: 1; }

.dl-item:hover {
  border-color: rgba(255, 255, 255, 0.35);
  filter: brightness(1.14);
  transform: translateY(-2px);
  box-shadow:
    0 12px 28px rgba(0, 0, 0, 0.32),
    inset 0 2px 7px rgba(255, 255, 255, 0.4),
    0 0 32px hsla(var(--hue), 95%, 68%, 0.35);
}

.dl-item:hover::before {
  filter: blur(16px) brightness(1.3);
  animation-duration: 4.5s;
}

.dl-item:active {
  transform: translateY(0) scale(0.99);
  filter: brightness(0.95);
}

.dl-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: inset 0 1px 3px rgba(255, 255, 255, 0.28);
}

.dl-icon svg { width: 22px; height: 22px; }

.dl-icon.i-blue   { color: #bfdbfe; }
.dl-icon.i-cyan   { color: #a5f3fc; }
.dl-icon.i-purple { color: #ddd6fe; }

.dl-body {
  flex: 1;
  min-width: 0;
  text-align: left;
}

.dl-title {
  display: block;
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 2px;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
}

.dl-desc {
  display: block;
  font-size: 0.76rem;
  color: rgba(255, 255, 255, 0.52);
}

.dl-arrow {
  flex-shrink: 0;
  color: rgba(255, 255, 255, 0.32);
  transition: color 0.25s, transform 0.25s;
}

.dl-arrow svg { width: 16px; height: 16px; }

.dl-item:hover .dl-arrow {
  color: rgba(255, 255, 255, 0.85);
  transform: translateX(3px);
}

.page-note {
  margin-top: 26px;
  font-size: 0.74rem;
  line-height: 1.8;
  color: var(--text-faint);
  text-align: center;
}

/* ============================================================
   8. 页脚
   ============================================================ */
.footer {
  position: relative;
  z-index: 1;
  padding: 28px 24px 36px;
  text-align: center;
  font-size: 0.78rem;
  letter-spacing: 1px;
  color: var(--text-faint);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* ============================================================
   9. 响应式
   ============================================================ */
@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px 18px 20px;
    background: rgba(10, 14, 22, 0.92);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.28s ease, transform 0.28s ease;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .nav-link.active::after { display: none; }
  .nav-link.active {
    background: rgba(0, 161, 214, 0.18);
    border: 1px solid rgba(0, 161, 214, 0.3);
  }

  .nav-toggle { display: flex; }

  .site { padding: calc(var(--nav-h) + 40px) 18px 60px; }

  .hero { padding: 12px 0 48px; }

  .hero-avatar {
    width: 80px;
    height: 80px;
    font-size: 32px;
    margin-bottom: 22px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    max-width: 340px;
    margin: 0 auto;
  }

  .btn-liquid {
    width: 100%;
    padding: 14px 24px;
  }

  .feature-card { padding: 22px 20px; }

  .page-windows { max-width: 100%; }
}

@media (max-width: 400px) {
  .logo-text { display: none; }
  .dl-item { padding: 13px 14px; gap: 12px; }
  .dl-icon { width: 40px; height: 40px; }
  .dl-title { font-size: 0.92rem; }
}

/* 尊重系统「减少动效」偏好 */
@media (prefers-reduced-motion: reduce) {
  .stars::before,
  .stars::after { transform: none !important; animation: none !important; }
  .btn-liquid::before,
  .btn-liquid::after,
  .feature-card::before,
  .dl-item::before,
  .back-btn::before { animation: none !important; }
  .page.active { animation: none; }
}