:root {
    --bg-dark: rgba(10, 10, 20, 0.7);
    --bg-dark-solid: #0a0a14;
    --bg-header: rgba(10, 10, 20, 0.8);
    --bg-header-scrolled: rgba(10, 10, 20, 0.95);
    --bg-body: rgba(0, 0, 0, 0.5);
    --bg-body-scrolled: rgba(0, 0, 0, 0.7);
    --text-primary: #fff;
    --text-secondary: #ddd;
    --text-muted: #888;
    --accent: #00d4ff;
    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-medium: rgba(255, 255, 255, 0.2);
    --blur-amount: blur(10px);
    --section-spacing: 100px;
    --container-padding: 20px;
    --card-padding: 40px;
    --header-height: 70px;
    --border-radius: 20px;
    --border-radius-sm: 10px;
    --transition-speed: 0.3s;
}

* {
    box-sizing: border-box;
}

html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    background-image: url('images/TopBackGround.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-color: var(--bg-dark-solid);
}

body {
    margin: 0;
    padding: 0;
    color: var(--text-primary);
    background: var(--bg-body);
    min-height: 100vh;
    transition: background-color 0.5s ease;
}

body.scrolled {
    background-color: var(--bg-body-scrolled);
}

.header-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-header);
    backdrop-filter: var(--blur-amount);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
}

.header-wrapper.scrolled {
    background: var(--bg-header-scrolled);
    backdrop-filter: var(--blur-amount);
    border-bottom: 1px solid var(--border-medium);
}

.header-logo {
    height: 100%;
    flex-shrink: 0;
}

.header-logo img {
    height: 100%;
    object-fit: contain;
}

.header-nav {
    display: flex;
    white-space: nowrap;
}

.header-nav a {
    font-family: 'Shippori Mincho', serif;
    margin-left: 25px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    transition: var(--transition-speed);
}

.header-nav a:hover {
    color: var(--text-primary);
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}

main {
    padding-top: 0;
}

.top-logo {
    display: flex;
    justify-content: center;
    padding-top: 100px;
    padding-bottom: 50px;
}

.logo-container {
    position: relative;
    display: inline-block;
    padding: 20px;
}

.main-logo-img {
    width: 70vw;
    max-width: 600px;
    height: auto;
    display: block;
}

.mini-chara-img {
    position: absolute;
    right: -100px;
    bottom: -100px;
    width: 256px;
    height: auto;
}

@media (max-width: 900px) {
    .logo-container {
        padding-bottom: 50px;
        text-align: center;
    }

    .mini-chara-img {
        position: static;
        display: block;
        margin: 20px auto 0;
        width: 150px;
    }
}

.section-title {
    font-family: 'Shippori Mincho', serif;
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-primary);
}

.news-section {
    max-width: 1000px;
    margin: var(--section-spacing) auto;
    padding: var(--container-padding);
}

.news-container {
    max-width: 800px;
    margin: var(--section-spacing) auto;
    padding: 40px;
    background: var(--bg-dark);
    backdrop-filter: var(--blur-amount);
    border-radius: var(--border-radius);
    color: var(--text-primary);
}

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

.news-list li {
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 10px;
}

.news-date {
    display: inline-block;
    width: 100px;
    color: var(--text-muted);
    font-size: 14px;
}

.news-list a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-speed);
}

.news-list a:hover {
    color: var(--accent);
}

.about-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    max-width: 900px;
    margin: var(--section-spacing) auto;
    padding: 50px;
    background: var(--bg-dark);
    backdrop-filter: var(--blur-amount);
    border-radius: var(--border-radius);
}

.about-text {
    flex: 1;
}

.about-image {
    flex: 0 0 300px;
}

.about-image img {
    width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .about-container {
        flex-direction: column-reverse;
        padding: 20px;
    }

    .about-image {
        flex: 0 0 auto;
        max-width: 250px;
        margin: 0 auto 20px auto;
    }

    .about-image img {
        width: 100%;
        height: auto;
        display: block;
    }
}

.profile-list {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.profile-list li {
    margin-bottom: 10px;
    border-bottom: 1px solid var(--border-medium);
    padding-bottom: 5px;
}

.sns-links {
    display: flex;
    justify-content: flex-start;
    gap: 20px;
    margin-top: 20px;
}

.sns-links a img {
    width: 60px;
    height: 60px;
    transition: var(--transition-speed);
    filter: brightness(0.9);
}

.sns-links a:hover img {
    filter: brightness(1.3);
    transform: scale(1.1);
}

footer {
    background: var(--bg-header-scrolled);
    padding: 30px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    border-top: 1px solid var(--border-subtle);
}

.footer-links {
    margin-bottom: 15px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 10px;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.works-section {
    max-width: 1000px;
    margin: var(--section-spacing) auto;
    padding: var(--container-padding);
}

.work-card {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 80px;
    background: var(--bg-dark);
    padding: var(--card-padding);
    border-radius: var(--border-radius);
    backdrop-filter: var(--blur-amount);
}

.work-card.reverse {
    flex-direction: row-reverse;
}

.work-text,
.work-visual {
    flex: 1;
}

.work-visual img {
    width: 100%;
    border-radius: var(--border-radius-sm);
}

.work-title {
    font-family: 'Shippori Mincho', serif;
    font-size: 28px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.work-tech {
    color: var(--accent);
    margin-bottom: 10px;
    font-size: 15px;
}

.work-link {
    display: inline-flex;
    align-items: center;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
    padding: 5px 12px;
    border-radius: 4px;
    text-decoration: none;
    margin-bottom: 15px;
    transition: var(--transition-speed);
}

.work-link .github-icon {
    width: 14px;
    height: 14px;
    margin-right: 6px;
    filter: brightness(0) invert(1);
}

.work-link:hover {
    background: rgba(255, 255, 255, 0.3);
}

.work-desc {
    line-height: 1.8;
    color: var(--text-secondary);
    font-size: 15px;
}

@media (max-width: 768px) {
    .work-card,
    .work-card.reverse {
        flex-direction: column;
        gap: 20px;
    }
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-up.active {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

.oss-projects-section {
    max-width: 1000px;
    margin: var(--section-spacing) auto;
    padding: var(--container-padding);
}

.oss-icon-wrapper a {
    display: block;
    width: 100%;
    height: 100%;
}

.oss-main-icon {
    width: 100% !important;
    height: auto;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
    transition: transform 0.3s ease;
}

.work-card:hover .oss-main-icon {
    transform: scale(1.08);
    filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.5));
}

.work-links-area {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.qiita-link {
    display: flex;
    align-items: center;
    gap: 6px;
}

.work-links-area .work-link {
    margin-bottom: 0;
}

@media (max-width: 768px) {
    .oss-icon-wrapper {
        width: 100%;
        box-sizing: border-box;
        padding: 30px 20px;
    }
}