:root {
  --steam-bg: #1B2838;
  --steam-panel: #171A21;
  --steam-accent: #66C0F4;
  --steam-green: #A4D007;
  --steam-green-hover: #BEE824;
  --steam-text: #C7D5E0;
  --steam-muted: #8F98A0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--steam-bg);
  color: var(--steam-text);
  font-family: 'Noto Sans SC', sans-serif;
}

.nav-scrolled {
  background-color: rgba(23, 26, 33, 0.97) !important;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.btn-download {
  background: linear-gradient(135deg, #A4D007 0%, #8BB006 50%, #A4D007 100%);
  background-size: 200% 200%;
  animation: shimmer 3s ease infinite;
  color: #1B2838;
  font-weight: 700;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(164, 208, 7, 0.5);
}

.btn-download-outline {
  border: 2px solid var(--steam-accent);
  color: var(--steam-accent);
  transition: all 0.2s;
}

.btn-download-outline:hover {
  background: rgba(102, 192, 244, 0.1);
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.tag-badge {
  background: rgba(102, 192, 244, 0.15);
  border: 1px solid rgba(102, 192, 244, 0.3);
  color: var(--steam-accent);
}

.feature-card {
  transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

.gallery-item img {
  transition: transform 0.3s, filter 0.3s;
}

.gallery-item:hover img {
  transform: scale(1.05);
  filter: brightness(1.15);
}

.faq-item {
  overflow: hidden;
}

.faq-trigger {
  gap: 1rem;
}

.faq-question {
  flex: 1;
  min-width: 0;
}

.faq-icon {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  font-size: 1.25rem;
}

.faq-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-panel-inner {
  padding: 0 1.25rem 1.25rem;
}

.changelog-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.review-card {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.review-card.review-visible {
  opacity: 1;
  transform: translateY(0);
}

.tab-active {
  background: var(--steam-green);
  color: #1B2838;
}

.tab-inactive {
  background: rgba(255, 255, 255, 0.08);
  color: var(--steam-text);
}

.hero-overlay {
  background: linear-gradient(180deg, rgba(27, 40, 56, 0.75) 0%, rgba(23, 26, 33, 0.92) 100%);
}

.steam-panel {
  background: var(--steam-panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.rating-bar-positive {
  background: linear-gradient(90deg, #4c6b22 0%, #A4D007 100%);
}

.star-filled {
  color: #FFD700;
}