body{
  font-family: system-ui;
  max-width: 900px;
  margin: auto;
  padding: 20px;
  line-height: 1.7;
}
section{
  margin-bottom:40px;
}
header{
  margin-bottom:40px;
}
footer{
  text-align:center;
  border-top:2px solid #e5e5e5;
  margin-top:20px;
}
a{
  color:#1a73e8;
}

.top-nav{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:10px 0;
  border-bottom:2px solid #e5e5e5;
  margin-bottom:20px;
}
.top-nav a{
  text-decoration:none;
  color:#333;
  font-weight:500;
  position:relative;
}
.top-nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-4px;
  width:100%;
  height:2px;
  background:#666;
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .2s ease;
}
.top-nav a:hover::after{
  transform:scaleX(1);
}
.nav-right{
  font-size:0.9rem;
}
.current{
  font-weight:600;
}

.app-list{
  display:grid;
  gap:24px;
  margin-top:20px;
}
.app-card{
  border:1px solid #ddd;
  border-radius:10px;
  padding:20px;
  background:#fff;
  box-shadow:0 2px 6px rgba(0,0,0,0.05);
}
.app-card h2{
  margin-top:0;
}
.store-link{
  display:inline-block;
  margin-top:8px;
  font-weight:600;
}

.play-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  background: #34a853;
  text-decoration: none;
  border-radius: 8px;
  box-shadow: 0 3px 8px rgba(0,0,0,0.2);
  transition: all 0.2s ease;
}
.play-button:hover {
  background: #2c8e47;
  transform: translateY(-1px);
  box-shadow: 0 5px 12px rgba(0,0,0,0.25);
}
.play-button:active {
  transform: translateY(1px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
.play-icon {
  width: 22px;
  height: 22px;
}

.video-container {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 20px auto;
  padding-top: 56.25%;
}
.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}
.screenshot-grid img {
  width: 100%;
  border-radius: 8px;
}

.copy-box {
  max-width: 700px;
}
.copy-box textarea {
  width: 100%;
  height: 120px;
  padding: 10px;
  font-family: monospace;
  font-size: 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  resize: vertical;
}
.copy-box button {
  margin-top: 8px;
  padding: 8px 16px;
  border: none;
  background: #4CAF50;
  color: white;
  font-weight: bold;
  border-radius: 6px;
  cursor: pointer;
}
.copy-box button:hover {
  background: #43a047;
}