/* ==================== リセット & ベース設定 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - 水色をメインに */
    --primary-color: #87CEEB;
    --primary-light: #B0E0F6;
    --primary-dark: #5FB8D9;
    --accent-color: #FFD700;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-white: #FFFFFF;
    --bg-light: #F8FAFB;
    --bg-gradient: linear-gradient(135deg, #E0F7FA 0%, #B2EBF2 100%);

    /* フォント */
    --font-main: 'Kiwi Maru', 'Hiragino Kaku Gothic ProN', 'ヒラギノ角ゴ ProN W3', 'Meiryo', 'メイリオ', sans-serif;
    --font-en: 'Kiwi Maru', 'Helvetica Neue', Arial, sans-serif;

    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* その他 */
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    line-height: 1.8;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==================== ヘッダー ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
}

.header.hidden-on-hero {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-100%);
    pointer-events: none;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-dark);
    font-weight: 600;
    letter-spacing: 0.05em;
}

.subtitle {
    font-family: var(--font-en);
    font-size: 0.7rem;
    color: var(--text-light);
    letter-spacing: 0.15em;
    margin-top: 0.2rem;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-dark);
    background: var(--primary-light);
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(135, 206, 235, 0.3) 100%);
}

/* ==================== ヒーローセクション ==================== */
.hero {
    height: 100vh;
    min-height: 640px;
    position: relative;
    z-index: 1;
    isolation: isolate;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-gradient);
    overflow: hidden;
}

.hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        linear-gradient(180deg, rgba(44, 62, 80, 0.2) 0%, rgba(44, 62, 80, 0.44) 58%, rgba(44, 62, 80, 0.68) 100%),
        linear-gradient(135deg, rgba(95, 184, 217, 0.26) 0%, rgba(255, 255, 255, 0.04) 52%, rgba(135, 206, 235, 0.18) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    width: min(760px, calc(100% - 2rem));
    padding: var(--spacing-md);
    animation: fadeInUp 1s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    color: var(--bg-white);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.28em;
}

.hero-subtitle {
    font-family: var(--font-en);
    font-size: 1.2rem;
    color: #E0F7FA;
    letter-spacing: 0.35em;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.92);
    max-width: 600px;
    margin: 0 auto;
    line-height: 2;
}

.hero-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.hero-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.9);
    transition: var(--transition);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.hero-icon:hover {
    color: var(--bg-white);
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.hero-icon svg {
    width: 20px;
    height: 20px;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    animation: bounce 2s infinite;
    z-index: 2;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

.scroll-indicator span {
    font-family: var(--font-en);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: rgba(255, 255, 255, 0.86);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.86), transparent);
}

/* ==================== セクション共通 ==================== */
.section {
    position: relative;
    z-index: 2;
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

.section:nth-child(even) {
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.title-en {
    display: block;
    font-family: var(--font-en);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    letter-spacing: 0.15em;
    margin-bottom: var(--spacing-xs);
}

.title-ja {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    letter-spacing: 0.2em;
}

/* ==================== プロフィールセクション ==================== */
.profile-section {
    background: var(--bg-white);
}

.profile-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.profile-image {
    position: relative;
}

.image-placeholder {
    aspect-ratio: 3/4;
    background: var(--bg-gradient);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-text {
    font-size: 1.5rem;
    color: var(--primary-dark);
    font-weight: 600;
    letter-spacing: 0.1em;
    position: relative;
    z-index: 1;
}

.profile-photo {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center;
}

.profile-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.profile-item {
    display: flex;
    padding: var(--spacing-sm);
    background: rgba(248, 250, 251, 0.8);
    border-radius: var(--border-radius);
}

.profile-label {
    min-width: 140px;
    font-weight: 600;
    color: var(--primary-dark);
}

.profile-value {
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.color-badge {
    display: inline-block;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
}

/* ==================== スキル/魅力セクション ==================== */
.charm-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.charm-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
}

.charm-card:hover {
    transform: translateY(-10px);
    background: linear-gradient(135deg, var(--bg-white) 0%, rgba(224, 247, 250, 0.45) 100%);
}

.charm-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.charm-title {
    font-size: 1.3rem;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.charm-description {
    color: var(--text-light);
    line-height: 1.9;
}

/* ==================== プロジェクト/ギャラリーセクション ==================== */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.gallery-item:hover {
    transform: scale(1.05);
}

.gallery-placeholder {
    aspect-ratio: 1;
    background: var(--bg-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.gallery-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover .gallery-placeholder::before {
    opacity: 1;
}

.gallery-placeholder .placeholder-text {
    font-size: 1.2rem;
    color: var(--primary-dark);
    font-weight: 600;
    letter-spacing: 0.1em;
}

.gallery-photo {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: center;
    position: relative;
    z-index: 1;
}

.gallery-item:nth-child(-n+5) .gallery-photo {
    object-position: top center;
}

.gallery-item a {
    text-decoration: none;
    color: inherit;
    display: block;
}

.project-info {
    background: var(--bg-white);
    padding: var(--spacing-md);
    position: relative;
    z-index: 2;
}

.project-title {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-xs);
}

.project-tech {
    font-size: 0.8rem;
    color: var(--primary-dark);
    font-weight: 500;
    font-family: var(--font-en);
}

/* ==================== 活動情報セクション ==================== */
.activity-content {
    display: grid;
    gap: var(--spacing-md);
}

.activity-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.activity-card:hover {
    background: linear-gradient(135deg, var(--bg-white) 0%, rgba(224, 247, 250, 0.45) 100%);
}

.activity-date {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--bg-white);
    background: var(--primary-color);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.activity-title {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.activity-description {
    color: var(--text-light);
    line-height: 1.9;
}

/* SNSリンク */
.sns-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.sns-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.2rem;
    border-radius: 25px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
}

.sns-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sns-x {
    background: #000000;
    color: #FFFFFF;
}

.sns-x:hover {
    background: #1a1a1a;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.sns-instagram {
    background: linear-gradient(135deg, #405DE6 0%, #5851DB 25%, #833AB4 50%, #C13584 75%, #E1306C 87.5%, #FD1D1D 100%);
    color: #FFFFFF;
}

.sns-instagram:hover {
    box-shadow: 0 4px 12px rgba(193, 53, 132, 0.4);
    filter: brightness(1.1);
}

.sns-github {
    background: #24292e;
    color: #FFFFFF;
}

.sns-github:hover {
    background: #1a1e22;
    box-shadow: 0 4px 12px rgba(36, 41, 46, 0.4);
}

.sns-qiita {
    background: #55C500;
    color: #FFFFFF;
}

.sns-qiita:hover {
    background: #4db300;
    box-shadow: 0 4px 12px rgba(85, 197, 0, 0.4);
}

.sns-website {
    background: var(--primary-color);
    color: #FFFFFF;
}

.sns-website:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(95, 184, 217, 0.4);
}

.sns-tiktok {
    background: #000000;
    color: #FFFFFF;
}

.sns-tiktok:hover {
    background: #1a1a1a;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* ==================== フッター ==================== */
.footer {
    background: linear-gradient(135deg, #2C3E50 0%, #34495E 100%);
    color: var(--bg-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    text-align: center;
}

.footer-logo h3 {
    font-size: 1.5rem;
    margin-bottom: 0.3rem;
    letter-spacing: 0.1em;
}

.footer-logo p {
    font-family: var(--font-en);
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    opacity: 0.7;
    margin-bottom: var(--spacing-md);
}

.footer-sns {
    margin: var(--spacing-md) 0;
}

.footer-sns-label {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    opacity: 0.7;
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-en);
}

.footer-sns-icons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.footer-sns-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--bg-white);
    transition: var(--transition);
    text-decoration: none;
}

.footer-sns-icon svg {
    width: 20px;
    height: 20px;
}

.footer-sns-icon:hover {
    background: rgba(255, 255, 255, 0.2);
}

.footer-text {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

.footer-copyright {
    font-size: 0.8rem;
    opacity: 0.6;
    padding-top: var(--spacing-md);
}

/* ==================== レスポンシブ対応 ==================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }

    .nav {
        gap: var(--spacing-sm);
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-link {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-description {
        font-size: 0.95rem;
        padding: 0 var(--spacing-sm);
    }

    .hero {
        min-height: 560px;
    }

    .profile-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .title-en {
        font-size: 2rem;
    }

    .charm-grid,
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }

    .sns-links {
        flex-direction: column;
    }

    .sns-link {
        width: 100%;
        justify-content: center;
    }
}

/* ==================== アニメーション ==================== */
.fade-in {
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    animation: slideInLeft 0.8s ease forwards;
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    animation: slideInRight 0.8s ease forwards;
}

@keyframes slideInRight {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}