/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Electrolize', 'Noto Sans JP', sans-serif;
    overflow-x: hidden;
    visibility: hidden;
}

body.loaded {
    visibility: visible;
}

/* Guide page container */
.guide-page {
    min-height: 100vh;
    width: 100%;
    background-image: url('../images/background.png');
    background-repeat: repeat;
    background-size: 50px 50px;
    background-position: 0 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 46px 18px 56px;
    gap: 54px;
    position: relative;
    animation: backgroundFlow 10s linear infinite;
}

@keyframes backgroundFlow {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: 50px 50px;
    }
}

/* Head section */
.head {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
    width: 100%;
    max-width: 700px;
    opacity: 0;
    animation: fadeIn 1s ease-out 0.2s forwards;
}

/* Back button */
.back-button {
    background: transparent;
    border: none;
    padding: 0;
    width: 43px;
    height: 43px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.back-button:hover {
    transform: scale(1.1);
}

.back-button:active {
    transform: scale(0.95);
}

.back-icon {
    width: 100%;
    height: 100%;
}

/* Guide header */
.guide-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

/* Guide data card */
.guide-data {
    background-color: white;
    border: 2px solid black;
    border-radius: 13px;
    box-shadow: 3px 3px 0px 0px black;
    padding: 24px 7px;
    width: 100%;
    min-height: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.guide-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 100%;
}

/* Guide number */
.guide-number {
    font-family: 'Electrolize', sans-serif;
    font-size: 40px;
    font-weight: 700;
    letter-spacing: 4px;
    color: white;
    line-height: 1;
    text-align: center;
    -webkit-text-stroke: 5px black;
    text-stroke: 5px black;
    paint-order: stroke fill;
    margin: 0;
}

/* Guide title */
.guide-title {
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    font-weight: 800;
    font-size: 28px;
    color: black;
    text-align: center;
    line-height: 1.2;
    margin: 0;
}

/* Guide description */
.guide-description {
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    font-weight: 600;
    font-size: 13px;
    color: #686868;
    text-align: center;
    line-height: normal;
}

/* YouTube container */
.youtube-container {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 16 / 9;
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}

.youtube-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Paragraph section */
.paragraph-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 100%;
    max-width: 700px;
    opacity: 0;
    animation: fadeIn 1s ease-out 0.4s forwards;
}

/* Paragraph header with highlight */
.paragraph-header-wrapper {
    margin-bottom: 6px;
}

.paragraph-header {
    display: inline-block;
    position: relative;
}

.paragraph-title {
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    font-weight: 900;
    font-size: 19px;
    color: black;
    text-align: left;
    line-height: 1.55;
    position: relative;
    z-index: 2;
    display: inline;
    background: linear-gradient(
        transparent calc(100% - 0.75em),
        #7fff00 calc(100% - 0.75em)
    );
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
}

.paragraph-highlight {
    display: none;
}

/* Paragraph text */
.paragraph-text {
    font-family: 'Roboto', 'Noto Sans JP', sans-serif;
    font-weight: 400;
    font-size: 16px;
    color: black;
    line-height: 1.85;
    text-align: left;
}

/* Keyframe animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    .guide-page {
        padding: 40px 16px 48px;
        gap: 48px;
    }

    .guide-number {
        font-size: 36px;
        -webkit-text-stroke: 4px black;
        text-stroke: 4px black;
    }

    .guide-title {
        font-size: 26px;
    }
}

@media (max-width: 480px) {
    .guide-page {
        padding: 32px 12px 40px;
        gap: 40px;
    }

    .head {
        gap: 12px;
    }

    .back-button {
        width: 36px;
        height: 36px;
    }

    .guide-data {
        height: auto;
        min-height: auto;
        padding: 12px 7px;
    }

    .guide-info {
        gap: 8px;
    }

    .guide-number {
        font-size: 32px;
        letter-spacing: 3px;
    }

    .guide-title {
        font-size: 24px;
    }

    .guide-description {
        font-size: 12px;
    }

    .youtube-container {
        width: 100%;
        max-width: 306px;
        height: auto;
        aspect-ratio: 16 / 9;
    }

    .paragraph-title {
        font-size: 18px;
    }

    .paragraph-text {
        font-size: 15px;
    }
}