/* ============================================================
   瓜子音乐官网 · 沉浸式首页
   设计语言与客户端一致：深色玻璃拟态 + 动态主题色 + 封面取色
   ============================================================ */

:root {
  --bg: #0a0a0c;
  --bg-raise: #101014;
  --bg-glass: rgba(18, 19, 24, 0.55);
  --fg: rgba(255, 255, 255, 0.94);
  --fg-2: rgba(255, 255, 255, 0.62);
  --fg-3: rgba(255, 255, 255, 0.38);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --accent: #ff2d55;
  --accent-soft: rgba(255, 45, 85, 0.16);
  --lab-accent: #ff2d55;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --nav-h: 64px;
  --max-w: 1180px;
  --font: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(255, 45, 85, 0.35); }

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; }

/* ---------- 背景氛围 ---------- */
.page-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 500px at 85% -5%, rgba(255, 45, 85, 0.10), transparent 60%),
    radial-gradient(800px 500px at 5% 30%, rgba(99, 102, 241, 0.08), transparent 60%),
    radial-gradient(700px 600px at 70% 90%, rgba(56, 189, 248, 0.05), transparent 60%),
    var(--bg);
}

/* ---------- 导航 ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.site-nav.is-scrolled,
body.nav-open .site-nav {
  background: rgba(10, 10, 12, 0.72);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: var(--max-w);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand { display: inline-flex; align-items: center; gap: 10px; }
.nav-brand img { height: 30px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; }
.nav-links a {
  color: var(--fg-2);
  transition: color 0.2s ease;
  position: relative;
}
.nav-links a:hover { color: var(--fg); }
.nav-links .nav-active { color: var(--fg); font-weight: 600; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  color: #0b0b0d !important;
  font-weight: 600;
  font-size: 13px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 8px 24px -8px rgba(255, 255, 255, 0.35); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 101;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 1px;
  transition: transform 0.25s, opacity 0.25s;
}
body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(10, 10, 12, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
  }
  body.nav-open .nav-links { display: flex; }
  .nav-links > a, .nav-links > span {
    padding: 14px 0;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .nav-links > *:last-child { border-bottom: 0; }
  .nav-cta { justify-content: center; margin-top: 10px; }
}

/* ---------- 公告条 ---------- */
.announce-bar {
  position: relative;
  z-index: 5;
  margin-top: var(--nav-h);
  background: linear-gradient(90deg, var(--accent-soft), rgba(139, 92, 246, 0.12));
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.announce-bar[hidden] { display: none; }
.announce-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 9px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg-2);
}
.announce-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  flex-shrink: 0;
  animation: pulse-dot 1.8s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 0.55; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.15); }
}
.announce-inner a { color: var(--fg); font-weight: 600; margin-left: 2px; }
.announce-inner a:hover { text-decoration: underline; }
.announce-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--fg-3);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 4px;
  transition: color 0.2s;
}
.announce-close:hover { color: var(--fg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 24px 72px;
  overflow: hidden;
}
.announce-bar:not([hidden]) ~ main .hero,
body:has(.announce-bar:not([hidden])) .hero {
  min-height: calc(100svh - 38px);
}
#hero-aurora {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, black 55%, transparent 98%);
  -webkit-mask-image: linear-gradient(to bottom, black 55%, transparent 98%);
}
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(120% 90% at 50% 0%, transparent 55%, rgba(10, 10, 12, 0.55) 100%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 1240px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.22fr);
  gap: 44px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 12.5px;
  color: var(--fg-2);
  margin-bottom: 26px;
}
.hero-badge-version {
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(40px, 5.6vw, 68px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}
.hero-title .grad {
  background: linear-gradient(100deg, #fff 10%, var(--accent) 55%, #ff8c5a 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 16.5px;
  color: var(--fg-2);
  max-width: 30em;
  margin-bottom: 30px;
}
.hero-desc strong { color: var(--fg); font-weight: 600; }

.hero-downloads { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 16px; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border-radius: 14px;
  background: linear-gradient(100deg, var(--accent) 0%, #ff8c5a 130%);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  box-shadow: 0 14px 36px -12px var(--accent-soft), 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
  transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
}
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.08); box-shadow: 0 20px 44px -12px rgba(255, 45, 85, 0.4); }
.btn-primary svg { width: 19px; height: 19px; }
.btn-primary .btn-sub { font-size: 12px; font-weight: 500; opacity: 0.85; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  color: var(--fg);
  font-weight: 600;
  font-size: 15px;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.09); transform: translateY(-2px); border-color: rgba(255, 255, 255, 0.26); }
.btn-ghost svg { width: 19px; height: 19px; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 13px;
  color: var(--fg-3);
  margin-bottom: 12px;
}
.hero-sub-links { display: flex; gap: 18px; font-size: 13.5px; }
.hero-sub-links a {
  color: var(--fg-2);
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.hero-sub-links a:hover { color: var(--fg); border-bottom-color: var(--fg-3); }

/* Hero 应用窗口 */
.hero-visual { position: relative; }
.app-window {
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: var(--bg-raise);
  box-shadow:
    0 40px 90px -30px rgba(0, 0, 0, 0.75),
    0 0 90px -20px var(--accent-soft);
  overflow: hidden;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}
.app-window-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}
.app-window-dot { width: 11px; height: 11px; border-radius: 50%; }
.app-window-dot:nth-child(1) { background: #ff5f57; }
.app-window-dot:nth-child(2) { background: #febc2e; }
.app-window-dot:nth-child(3) { background: #28c840; }
.app-window-title {
  margin-left: 10px;
  font-size: 12px;
  color: var(--fg-3);
  letter-spacing: 0.04em;
}
.app-window-body { position: relative; }
.app-window-body img { width: 100%; height: auto; object-fit: contain; }
.hero-glow {
  position: absolute;
  inset: 8% -6% -10% -6%;
  z-index: -1;
  background: radial-gradient(50% 50% at 50% 50%, var(--accent-soft), transparent 75%);
  filter: blur(30px);
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--fg-3);
  font-size: 12px;
  letter-spacing: 0.2em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.scroll-hint::after {
  content: '';
  width: 1px;
  height: 34px;
  background: linear-gradient(to bottom, var(--fg-3), transparent);
  animation: scroll-drip 2s ease-in-out infinite;
}
@keyframes scroll-drip {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 通用 Section ---------- */
.section { padding: 110px 24px; position: relative; }
.section-inner { max-width: var(--max-w); margin: 0 auto; }
.section-kicker {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 14px;
}
.section-desc { color: var(--fg-2); font-size: 16px; max-width: 34em; }

/* ---------- FX Lab ---------- */
.lab { padding-top: 40px; }
.lab-head { text-align: center; margin-bottom: 44px; }
.lab-head .section-desc { margin: 0 auto; }

.lab-panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: var(--bg-glass);
  backdrop-filter: blur(24px) saturate(150%);
  -webkit-backdrop-filter: blur(24px) saturate(150%);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.7);
  overflow: hidden;
}
.lab-stage-wrap {
  position: relative;
  aspect-ratio: 21 / 9;
  min-height: 300px;
  background:
    radial-gradient(60% 80% at 50% 110%, color-mix(in srgb, var(--lab-accent) 14%, transparent), transparent 70%),
    #0c0c10;
}
#lab-stage { position: absolute; inset: 0; width: 100%; height: 100%; }

.lab-play-fab {
  position: absolute;
  right: 22px;
  bottom: 22px;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: color-mix(in srgb, var(--lab-accent) 82%, black);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 12px 32px -8px color-mix(in srgb, var(--lab-accent) 55%, transparent);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}
.lab-play-fab:hover { transform: scale(1.07); }
.lab-play-fab:active { transform: scale(0.96); }
.lab-play-fab svg { width: 22px; height: 22px; }
.lab-play-fab .icon-pause { display: none; }
.lab-play-fab.is-playing .icon-play { display: none; }
.lab-play-fab.is-playing .icon-pause { display: block; }
.lab-play-fab.is-playing {
  animation: fab-breathe 2.2s ease-in-out infinite;
}
@keyframes fab-breathe {
  0%, 100% { box-shadow: 0 12px 32px -8px color-mix(in srgb, var(--lab-accent) 55%, transparent); }
  50% { box-shadow: 0 12px 44px -4px color-mix(in srgb, var(--lab-accent) 80%, transparent); }
}

.lab-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 28px;
  padding: 18px 24px;
  border-top: 1px solid var(--line);
}
.lab-group { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.lab-group-label {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--fg-3);
  text-transform: uppercase;
}

.lab-chip {
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--fg-2);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.lab-chip:hover { border-color: var(--line-strong); color: var(--fg); transform: translateY(-1px); }
.lab-chip.is-active {
  background: color-mix(in srgb, var(--lab-accent) 22%, transparent);
  border-color: color-mix(in srgb, var(--lab-accent) 60%, transparent);
  color: #fff;
  box-shadow: 0 4px 18px -6px color-mix(in srgb, var(--lab-accent) 45%, transparent);
}

.lab-swatch {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  background-clip: padding-box;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.lab-swatch:hover { transform: scale(1.14); }
.lab-swatch.is-active {
  border-color: rgba(255, 255, 255, 0.85);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.15);
}

.lab-status {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--fg-3);
  display: flex;
  align-items: center;
  gap: 8px;
}
.lab-status::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lab-accent);
  box-shadow: 0 0 8px var(--lab-accent);
}

/* ---------- 功能亮点 ---------- */
.feature-screens {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin: 52px 0 64px;
}
.screen-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-raise);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.3s ease, box-shadow 0.35s ease;
  will-change: transform;
}
.screen-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
}
.screen-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: top; transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1); }
.screen-card:hover img { transform: scale(1.035); }
.screen-card-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 40px 18px 14px;
  background: linear-gradient(to top, rgba(5, 5, 8, 0.85), transparent);
  font-size: 13.5px;
  font-weight: 600;
}
.screen-card-cap span { display: block; font-weight: 400; font-size: 12px; color: var(--fg-2); margin-top: 2px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  padding: 26px 24px;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.25s ease, background 0.25s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.05);
}
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 16px;
}
.feature-icon svg { width: 21px; height: 21px; }
.feature-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 13.5px; color: var(--fg-2); line-height: 1.7; }

/* ---------- 更新日志 ---------- */
.changelog-list { list-style: none; margin-top: 44px; display: flex; flex-direction: column; gap: 14px; }
.changelog-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.025);
  padding: 20px 22px;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.changelog-item:hover { border-color: var(--line-strong); background: rgba(255, 255, 255, 0.05); }
.changelog-badge {
  flex-shrink: 0;
  padding: 5px 13px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
}
.changelog-meta { font-size: 12.5px; color: var(--fg-3); margin-bottom: 4px; }
.changelog-text { font-size: 14px; color: var(--fg-2); }
.changelog-empty { color: var(--fg-3); font-size: 14px; }
.changelog-empty a { color: var(--fg); text-decoration: underline; }
.changelog-more { margin-top: 26px; display: inline-flex; }

/* ---------- 下载 ---------- */
.download-panel {
  position: relative;
  border-radius: calc(var(--radius-lg) + 6px);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(80% 120% at 50% -20%, rgba(255, 45, 85, 0.14), transparent 60%),
    var(--bg-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  padding: 72px 40px;
  text-align: center;
  overflow: hidden;
}
.download-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(40% 30% at 80% 110%, rgba(139, 92, 246, 0.12), transparent 70%);
  pointer-events: none;
}
.download-title { font-size: clamp(26px, 3.4vw, 38px); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px; }
.download-desc { color: var(--fg-2); margin-bottom: 36px; }
.download-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; margin-bottom: 22px; }
.download-alt {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: 13.5px;
  color: var(--fg-3);
}
.download-alt a { color: var(--fg-2); border-bottom: 1px solid transparent; transition: color 0.2s, border-color 0.2s; }
.download-alt a:hover { color: var(--fg); border-bottom-color: var(--fg-3); }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 36px 24px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--fg-3);
}
.footer-inner a { color: var(--fg-3); display: inline-flex; align-items: center; gap: 6px; transition: color 0.2s; }
.footer-inner a:hover { color: var(--fg-2); }
.footer-inner svg { width: 14px; height: 14px; }

/* ---------- 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--reveal-delay, 0ms),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1) var(--reveal-delay, 0ms);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint::after, .announce-dot, .lab-play-fab.is-playing { animation: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 44px; }
  .hero { padding-top: calc(var(--nav-h) + 32px); }
  .hero-visual { max-width: 640px; }
  .feature-screens { grid-template-columns: 1fr; max-width: 560px; margin-left: auto; margin-right: auto; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .lab-stage-wrap { aspect-ratio: 16 / 10; }
}

@media (max-width: 620px) {
  .section { padding: 72px 20px; }
  .feature-grid { grid-template-columns: 1fr; }
  .changelog-item { flex-direction: column; gap: 10px; }
  .download-panel { padding: 52px 22px; }
  .lab-status { margin-left: 0; width: 100%; }
  .hero-downloads .btn-primary, .hero-downloads .btn-ghost { width: 100%; justify-content: center; }
}