晚秋/styles.css

@keyframes catchEntryLeft {
    from {
        opacity: 0;
        transform: translateX(-12px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes catchEntryRight {
    from {
        opacity: 0;
        transform: translateX(12px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes catchSweep {
    0% {
        background-position: -25% 50%;
        background-size: 0% 100%;
    }
    45% {
        background-position: -25% 50%;
        background-size: 100% 100%;
    }
    55% {
        background-position: 125% 50%;
        background-size: 100% 100%;
    }
    100% {
        background-position: 125% 50%;
        background-size: 0% 100%;
    }
}

@keyframes catchPlaceholder {
    0%, 48% {
        opacity: 1;
    }
    52%, 100% {
        opacity: 0;
    }
}

@keyframes catchText {
    0%, 48% {
        opacity: 0;
    }
    52%, 100% {
        opacity: 1;
    }
}

@keyframes catchCover {
    0% {
        left: 0;
        width: 0%;
    }
    45% {
        left: 0;
        width: 100%;
    }
    55% {
        left: 0;
        width: 100%;
    }
    100% {
        left: 100%;
        width: 0%;
    }
}

.intro {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.intro p {
    margin: 0.2em 0;
}

.catch-line--left {
    position: relative;
    display: inline-block;
    padding: 0.2em 0.5em;
    background-image: linear-gradient(90deg, #f7c873, #f7c873);
    background-repeat: no-repeat;
    background-position: -25% 50%;
    background-size: 0% 100%;
    opacity: 0;
    transform: translateY(12px);
    white-space: nowrap;
    overflow: hidden;
    animation:
        catchEntryLeft 0.8s 1.6s ease forwards,
        catchSweep 0.6s ease-in-out 2.6s both;
}

.catch-line--right {  
    position: relative;
    display: inline-block;
    padding: 0.2em 0.5em;
    background-image: linear-gradient(90deg, #f7c873, #f7c873);
    background-repeat: no-repeat;
    background-position: -25% 50%;
    background-size: 0% 100%;
    opacity: 0;
    transform: translateY(12px);
    white-space: nowrap;
    overflow: hidden;
    animation:
        catchEntryRight 0.8s 1.7s ease forwards,
        catchSweep 0.6s ease-in-out 2.9s both;
}

.catch-line--left::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 0;
    background: linear-gradient(90deg, #f7c873, #f7c873);
    z-index: 1;
    animation: catchCover 0.6s ease-in-out 2.6s both;
}

.catch-line--right::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 0;
    background: linear-gradient(90deg, #f7c873, #f7c873);
    z-index: 1;
    animation: catchCover 0.6s ease-in-out 2.9s both;
}

.catch-line__placeholder,
.catch-line__text {
    display: inline-block;
}

.catch-line__placeholder {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    opacity: 1;
    z-index: 2;
}

.catch-line__text {
    position: relative;
    z-index: 0;
    opacity: 0;
}

.catch-line__placeholder-left {
    animation: catchPlaceholder 0.9s ease-in-out 2.6s forwards;
}

.catch-line__placeholder-right {
    animation: catchPlaceholder 0.9s ease-in-out 2.9s forwards;
}

.catch-line__text-left {
    animation: catchText 0.6s ease-in-out 2.65s forwards;
}

.catch-line__text-right {
    animation: catchText 0.6s ease-in-out 2.95s forwards;
}

.poem-em {
    font-weight: 600;
    color: #f7c873;
    letter-spacing: normal;
    display: inline-block;
    text-shadow: 0 0 12px rgba(247, 200, 115, 0.7);
}