* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    overflow: hidden;
    background-color: #f0f0f0;
    font-family: "MS UI Gothic", "Meiryo UI", Arial, sans-serif;
}

.sidebar {
    width: 150px;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background-color: #c0c0c0;
    border-right: 2px solid #808080;
    overflow-y: auto;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.sidebar ul {
    padding: 20px 0;
    list-style: none;
}

.sidebar ul li {
    padding: 10px 20px;
    border-bottom: 1px solid #a0a0a0;
}

.sidebar ul li a {
    display: block;
    color: #000080;
    text-decoration: underline;
    font-weight: bold;
}

.sidebar ul li a:hover {
    color: #ff0000;
    background-color: #ffff00;
}

.main-content {
    margin-left: 150px;
    width: calc(100% - 150px);
    height: 100vh;
    overflow-y: auto;
    background-color: #f0f0f0;
}

.header {
    padding: 20px;
    width: 100%;
    text-align: center;
    background-color: #000080;
    color: #ffffff;
    border-bottom: 3px solid #ffd700;
}

.header h1 {
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.header p {
    color: #000080;
    font-style: italic;
}

.footer {
    margin-top: 40px;
    padding: 15px 20px;
    background-color: #000080;
    color: #ffffff;
    text-align: center;
    border-top: 3px solid #ffd700;
    font-size: 0.9em;
}

.footer p {
    margin: 0;
    color: #ffffff;
    font-style: normal;
}

/* Home */
.home-container {
    padding: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.portfolio-title {
    text-align: center;
    font-size: 4em;
    font-weight: bold;
    color: #000080;
    padding: 15px;
    margin-top: 200px;
    margin-bottom: 200px;
    text-shadow: 2px 2px 0px #ffffff;
}

.main-content .description {
    text-align: center;
    padding: 20px;
    background-color: #ffffcc;
    border: 3px double #ff6600;
    margin: 20px 0;
    font-size: 1.2em;
    font-weight: bold;
    box-shadow: 3px 3px 0px #999999;
}

.product-link-section {
    margin-top: 30px;
    padding: 20px;
    background-color: #ffffff;
    border: 3px ridge #808080;
    box-shadow: 3px 3px 0px #999999;
    text-align: center;
}

.product-link-section h2 {
    color: #000080;
    background-color: #c0c0c0;
    padding: 8px;
    border: 2px outset #e0e0e0;
    margin-bottom: 20px;
    font-size: 1.5em;
}

.product-link-button {
    display: inline-block;
    padding: 15px 40px;
    background-color: #c0c0c0;
    border: 3px outset #e0e0e0;
    color: #000080;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.3em;
    transition: all 0.2s;
}

.product-link-button:hover {
    background-color: #ffff00;
    border: 3px inset #e0e0e0;
    transform: scale(1.05);
}

.product-link-button:active {
    border: 3px inset #808080;
    transform: scale(0.98);
}

.contact-section {
    margin-top: 30px;
    padding: 20px;
    background-color: #ffffff;
    border: 3px ridge #808080;
    box-shadow: 3px 3px 0px #999999;
}

.contact-section h2 {
    color: #000080;
    background-color: #c0c0c0;
    padding: 8px;
    border: 2px outset #e0e0e0;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.contact-info {
    padding: 15px;
    background-color: #ffe4e1;
    border: 2px solid #ff69b4;
    font-family: "Courier New", monospace;
    font-size: 1.1em;
    text-align: center;
    color: #800000;
}

.links-section {
    margin-top: 30px;
    padding: 20px;
    background-color: #ffffff;
    border: 3px ridge #808080;
    box-shadow: 3px 3px 0px #999999;
}

.links-section h2 {
    color: #000080;
    background-color: #c0c0c0;
    padding: 8px;
    border: 2px outset #e0e0e0;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.contact {
    list-style: none;
    padding: 0;
}

.contact li {
    margin: 10px 0;
}

.contact li a {
    display: block;
    padding: 10px 20px;
    background-color: #c0c0c0;
    border: 2px outset #e0e0e0;
    color: #000080;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1em;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact li a::after {
    content: ' →';
    display: inline-block;
    transition: transform 0.3s ease;
    transform-origin: left;
}

.contact li a:hover {
    background-color: #ffff00;
    border: 2px inset #e0e0e0;
}

.contact li a:hover::after {
    transform: scaleX(8);
}

.contact li a:active {
    border: 2px inset #808080;
}

.contact li a.reverse-arrow::after {
    content: ' →';
    transform-origin: right;
}

.contact li a.reverse-arrow:hover::after {
    transform: scaleX(8);
}

/* Product */
.product-container {
    padding: 30px;
    background-color: #f0f0f0;
}

.product-item {
    padding: 15px;
    border: 3px ridge #808080;
    background-color: #ffffff;
    margin-bottom: 10px;
    box-shadow: 3px 3px 0px #999999;
}

.product-item:first-child {
    border: 3px ridge #808080;
}

.product-item h3 {
    color: #000080;
    background-color: #c0c0c0;
    padding: 5px 10px;
    border: 2px outset #e0e0e0;
    margin-bottom: 10px;
    font-size: 1.3em;
}

.product-item p {
    margin: 8px 0;
    line-height: 1.6;
}

.product-item .skill-description {
    color: #008000;
    font-weight: bold;
    font-style: italic;
}

.product-item a {
    display: inline-block;
    margin: 5px 10px 5px 0;
    padding: 5px 15px;
    background-color: #c0c0c0;
    border: 2px outset #e0e0e0;
    color: #000080;
    text-decoration: none;
    font-weight: bold;
}

.product-item a:hover {
    background-color: #ffff00;
    border: 2px inset #e0e0e0;
}

.product-item a:active {
    border: 2px inset #808080;
}

.excuse {
    text-align: center;
    padding: 150px 20px 150px 20px;
    background-color: #ffe4e1;
    border: 2px dotted #ff0000;
    margin: 20px;
    font-style: italic;
    font-size: 1.1em;
    color: #800000;
}

/* Clothes */
.clothes {
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background-color: #f0f0f0;
    min-height: calc(100vh - 80px);
}

.clothes iframe {
    margin-top: 10px;
    margin-bottom: 10px;
}

/* About */
.profile {
    padding: 30px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #f0f0f0;
}

.profile .icon {
    width: 300px;
    border: 5px double #000080;
    box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
}

.introduction {
    margin-top: 20px;
    background-color: #ffffcc;
    padding: 20px;
    border: 3px ridge #808080;
    max-width: 600px;
}

.introduction h2 {
    margin-bottom: 15px;
    color: #800000;
    background-color: #c0c0c0;
    padding: 8px;
    border: 2px outset #e0e0e0;
}

.introduction p {
    line-height: 1.8;
    text-align: center;
}

.tech-stack {
    margin-top: 20px;
    background-color: #f0fff0;
    padding: 20px;
    border: 3px ridge #008000;
}

.tech-stack h2 {
    color: #006400;
    background-color: #90ee90;
    padding: 8px;
    border: 2px outset #98fb98;
    margin-bottom: 15px;
}

.tech-stack table {
    width: 300px;
    border-collapse: collapse;
    margin: 0 auto;
    background-color: #ffffff;
}

.tech-stack td {
    padding: 8px 10px;
    border: 2px solid #008000;
}

.tech-stack td:first-child {
    background-color: #d0f0d0;
    font-weight: bold;
}

.bike-section {
    margin-top: 20px;
    background-color: #fff0f0;
    padding: 20px;
    border: 3px ridge #800000;
}

.bike-section h2 {
    color: #8b0000;
    background-color: #ffb6c1;
    padding: 8px;
    border: 2px outset #ffc0cb;
    margin-bottom: 15px;
}

.bike-section .roadbike {
    max-width: 500px;
    width: 100%;
    height: auto;
}

.bike-section h3 {
    margin-top: 10px;
    margin-bottom: 10px;
    color: #8b0000;
}

.bike-section table {
    width: 300px;
    border-collapse: collapse;
    margin: 0 auto;
    background-color: #ffffff;
}

.bike-section td {
    padding: 8px 10px;
    border: 2px solid #800000;
}

.bike-section td:first-child {
    background-color: #ffe4e1;
    font-weight: bold;
}

.bike-section p {
    line-height: 1.8;
    text-align: left;
    margin-top: 10px;
}

.bike-section .tweet {
    text-align: center;
    margin-top: 15px;
}

.travel-section {
    margin-top: 20px;
    background-color: #fffacd;
    padding: 20px;
    border: 3px ridge #daa520;
}

.travel-section h2 {
    color: #b8860b;
    background-color: #f0e68c;
    padding: 8px;
    border: 2px outset #f5deb3;
    margin-bottom: 15px;
}

/* レスポンシブデザイン */
@media screen and (max-width: 768px) {
    body {
        flex-direction: column;
        overflow: auto;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 3px solid #808080;
    }

    .sidebar ul {
        display: flex;
        flex-wrap: wrap;
        padding: 10px;
        justify-content: center;
    }

    .sidebar ul li {
        padding: 8px 15px;
        border-bottom: none;
        border-right: 1px solid #a0a0a0;
    }

    .sidebar ul li:last-child {
        border-right: none;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        height: auto;
    }

    .header h1 {
        font-size: 1.8em;
    }

    .home-container {
        padding: 15px;
    }

    .portfolio-title {
        font-size: 1.5em;
        padding: 10px;
    }

    .main-content .description {
        font-size: 1em;
        padding: 15px;
        margin: 15px 0;
    }

    .contact-section,
    .links-section {
        padding: 15px;
        margin-top: 20px;
    }

    .contact-section h2,
    .links-section h2 {
        font-size: 1.3em;
    }

    .product-container {
        padding: 15px;
    }

    .product-item {
        padding: 12px;
        margin-bottom: 15px;
    }

    .product-item h3 {
        font-size: 1.1em;
    }

    .product-item a {
        padding: 8px 12px;
        margin: 5px 5px 5px 0;
        font-size: 0.9em;
    }

    .clothes {
        padding: 15px;
    }

    .clothes iframe {
        width: 100%;
        max-width: 375px;
    }

    .profile {
        padding: 15px;
    }

    .profile .icon {
        width: 200px;
    }

    .bike-section .roadbike {
        max-width: 100%;
        width: 100%;
    }

    .introduction,
    .tech-stack,
    .bike-section,
    .travel-section {
        padding: 15px;
        max-width: 100%;
    }

    .tech-stack table,
    .bike-section table {
        width: 100%;
        max-width: 300px;
    }

    .tech-stack td,
    .bike-section td {
        padding: 6px 8px;
        font-size: 0.9em;
    }
}

/* 404 */
.error-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    padding: 30px;
}

.error-box {
    background-color: #ffffff;
    border: 5px ridge #ff0000;
    padding: 40px;
    text-align: center;
    box-shadow: 5px 5px 0px #999999;
    max-width: 600px;
    width: 100%;
}

.error-title {
    font-size: 8em;
    color: #ff0000;
    text-shadow: 3px 3px 0px #000080;
    margin-bottom: 20px;
    font-weight: bold;
}

.error-message {
    font-size: 2em;
    color: #000080;
    font-weight: bold;
    margin-bottom: 20px;
    background-color: #ffffcc;
    padding: 15px;
    border: 3px double #ff6600;
}

.error-description {
    font-size: 1.1em;
    color: #333333;
    margin-bottom: 30px;
    padding: 15px;
    background-color: #f0f0f0;
    border: 2px solid #808080;
}

.home-button {
    display: inline-block;
    padding: 15px 40px;
    background-color: #c0c0c0;
    border: 3px outset #e0e0e0;
    color: #000080;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.2em;
    transition: all 0.2s;
}

.home-button:hover {
    background-color: #ffff00;
    border: 3px inset #e0e0e0;
    transform: scale(1.05);
}

.home-button:active {
    border: 3px inset #808080;
}

.icon-image {
    width: 80px;
    cursor: pointer;
    display: block;
    margin: 0 auto 5px auto;
    transition: transform 0.2s;
}

.icon-image.clicked {
    animation: scaleUp 0.3s ease-out;
}

@keyframes scaleUp {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.3);
    }
    100% {
        transform: scale(1);
    }
}

.click-text {
    text-align: center;
    margin: 0 0 20px 0;
}

#heartsContainer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

.heart {
    position: absolute;
    width: 30px;
    height: 30px;
    animation: floatUp 3s ease-out forwards;
    pointer-events: none;
}

@keyframes floatUp {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-200px) scale(1.5);
    }
}

/* veryfunny */
.veryfunny-container {
    padding: 30px;
    max-width: 900px;
    margin: 0 auto;
    background-color: #f0f0f0;
}

.veryfunny-title {
    text-align: center;
    font-size: 2.5em;
    color: #000080;
    background-color: #c0c0c0;
    padding: 15px;
    border: 3px ridge #808080;
    margin-bottom: 10px;
    box-shadow: 3px 3px 0px #999999;
}

.veryfunny-subtitle {
    text-align: center;
    font-size: 1.2em;
    color: #800000;
    background-color: #ffffcc;
    padding: 10px;
    border: 2px solid #ff6600;
    margin-bottom: 30px;
}

.veryfunny-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.veryfunny-list li {
    background-color: #ffffff;
    border: 1px solid black;
    border-bottom: none;
    padding: 15px 20px;
    font-size: 1.1em;
}

.veryfunny-list li:last-child {
    border-bottom: 1px solid black;
}

/* Stackstones */
.stackstones-container {
    padding: 30px;
    max-width: 1100px;
    margin: 0 auto;
    background-color: #f0f0f0;
    text-align: center;
}

.stackstones-title {
    text-align: center;
    font-size: 2.5em;
    color: #000080;
    background-color: #c0c0c0;
    padding: 15px;
    border: 3px ridge #808080;
    margin-bottom: 10px;
    box-shadow: 3px 3px 0px #999999;
}

.stackstones-iframe {
    display: block;
    margin: 0 auto;
}

.stackstones-note {
    text-align: center;
    margin-top: 15px;
    padding: 10px;
    background-color: #ffffe0;
    border: 2px solid #ffd700;
    color: #000080;
    font-weight: bold;
}