@keyframes elegantSlideIn {
0% {
opacity: 0;
transform: translateY(-15px);
}
100% {
opacity: 1;
transform: translateY(0);
}
}
@keyframes buttonPress {
0% {
transform: perspective(1000px) rotateX(0deg) translateY(0);
}
50% {
transform: perspective(1000px) rotateX(5deg) translateY(2px);
}
100% {
transform: perspective(1000px) rotateX(0deg) translateY(0);
}
}
@keyframes listItemFadeIn {
0% {
opacity: 0;
transform: translateY(10px);
}
100% {
opacity: 1;
transform: translateY(0);
}
}
body {
background: #f5f5f5;
font-family: Arial, sans-serif;
margin: 0;
padding: 20px;
}
.container {
perspective: 1000px;
margin-bottom: 30px;
max-width: 600px;
margin-left: auto;
margin-right: auto;
}
.container .btn-box button {
width: 100%;
padding: 22px 28px;
background: linear-gradient(145deg, #ffffff, #e6e6e6);
border: none;
border-radius: 20px;
font-size: 16px;
font-weight: 700;
color: #333;
cursor: pointer;
transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
text-align: left;
position: relative;
box-shadow:
0 8px 16px rgba(0, 0, 0, 0.1),
0 4px 8px rgba(0, 0, 0, 0.06),
inset 0 1px 0 rgba(255, 255, 255, 0.8);
transform-style: preserve-3d;
}
.container .btn-box button::before {
content: '';
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: linear-gradient(145deg, #f0f0f0, #ffffff);
border-radius: 20px;
opacity: 0;
transition: opacity 0.3s ease;
z-index: -1;
}
.container .btn-box button:hover {
transform: perspective(1000px) rotateX(-2deg) translateY(-3px);
box-shadow:
0 15px 30px rgba(0, 0, 0, 0.15),
0 8px 16px rgba(0, 0, 0, 0.1),
inset 0 1px 0 rgba(255, 255, 255, 0.9);
color: #2196f3;
}
.container .btn-box button:active {
animation: buttonPress 0.2s ease;
box-shadow:
0 4px 8px rgba(0, 0, 0, 0.1),
0 2px 4px rgba(0, 0, 0, 0.06),
inset 0 2px 4px rgba(0, 0, 0, 0.1);
}
.container .more {
max-height: 0;
overflow: hidden;
transition: all 0.3s ease-out;
background: linear-gradient(145deg, #f8f9fa, #ffffff);
border-radius: 0 0 20px 20px;
box-shadow:
0 8px 16px rgba(0, 0, 0, 0.1),
0 4px 8px rgba(0, 0, 0, 0.06);
transform-style: preserve-3d;
margin-top: -10px;
position: relative;
z-index: 1;
}
.container .more::before {
content: '';
position: absolute;
top: 0;
left: 20px;
right: 20px;
height: 1px;
background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.1), transparent);
}
.container .more.appear {
max-height: 300px;
animation: elegantSlideIn 0.3s ease-out;
}
.container .more ul {
list-style: none;
padding: 25px 28px 28px;
margin: 0;
}
.container .more li {
padding: 15px 0;
color: #555;
border-bottom: 1px solid rgba(0, 0, 0, 0.05);
font-weight: 500;
position: relative;
transition: all 0.3s ease;
opacity: 0;
transform: translateY(10px);
animation: listItemFadeIn 0.4s ease-out forwards;
}
.container .more.appear li:nth-child(1) { animation-delay: 0.1s; }
.container .more.appear li:nth-child(2) { animation-delay: 0.15s; }
.container .more.appear li:nth-child(3) { animation-delay: 0.2s; }
.container .more.appear li:nth-child(4) { animation-delay: 0.25s; }
.container .more.appear li:nth-child(5) { animation-delay: 0.3s; }
.container .more li::before {
content: '▶';
position: absolute;
left: -15px;
top: 15px;
color: #2196f3;
font-size: 12px;
opacity: 0;
transition: all 0.3s ease;
transform: translateX(-5px);
}
.container .more li:hover {
color: #2196f3;
padding-left: 10px;
transform: translateX(5px);
}
.container .more li:hover::before {
opacity: 1;
transform: translateX(0);
}
.container .more li:last-child {
border-bottom: none;
}
/* レスポンシブ対応 */
@media (max-width: 768px) {
.container .btn-box button {
font-size: 14px;
padding: 18px 22px;
border-radius: 15px;
}
.container .more {
border-radius: 0 0 15px 15px;
}
.container .more ul {
padding: 20px 22px 22px;
}
.container .more li {
padding: 12px 0;
}
}