@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

/* --- デザイン変数定義 --- */
:root {
    --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent-color: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    --bg-glass: rgba(255, 255, 255, 0.8);
    --border-color: #e2e8f0;
    
    /* 影の効果 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 16px -6px rgba(0,0,0,0.04);
    
    /* 角丸 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    /* トランジション */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- リセット & 基本設定 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

/* --- レイアウト構造 --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 80px 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    position: relative;
    color: var(--text-primary);
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
    margin: 12px auto 0;
}

/* --- ヘッダー（グラスモーフィズム） --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 0;
}

.nav-link:hover {
    color: var(--accent-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition-smooth);
}

.nav-link:hover::after {
    width: 100%;
}

/* --- ヒーローセクション --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    background: radial-gradient(circle at 90% 10%, rgba(59, 130, 246, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 10% 90%, rgba(59, 130, 246, 0.03) 0%, transparent 40%);
}

.hero-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 48px;
    width: 100%;
}

.hero-content {
    flex: 1;
}

.hero-sub {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
    transform: translateY(-2px);
}

/* スタイリッシュなCSSアバター */
.hero-avatar-wrapper {
    flex-shrink: 0;
}

.avatar-container {
    position: relative;
    width: 320px;
    height: 320px;
}

.avatar-glow {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    background: var(--accent-gradient);
    border-radius: 50%;
    opacity: 0.15;
    filter: blur(15px);
    animation: pulse 4s infinite alternate;
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 6px solid var(--bg-secondary);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    font-weight: 700;
    color: var(--accent-color);
    user-select: none;
}

@keyframes pulse {
    0% { transform: scale(0.98); opacity: 0.1; }
    100% { transform: scale(1.02); opacity: 0.2; }
}

/* --- 自己紹介 (About) --- */
.about-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(226, 232, 240, 0.8);
    display: flex;
    gap: 48px;
}

.about-info {
    flex: 1;
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 1.05rem;
}

.about-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.detail-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* --- スキル (Skills) --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.skill-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(59, 130, 246, 0.3);
}

.skill-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: #eff6ff;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.5rem;
    font-weight: 700;
}

.skill-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.skill-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* --- プロジェクト (Projects) --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.project-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.project-thumb {
    height: 180px;
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-thumb::before {
    content: '';
    position: absolute;
    width: 150%;
    height: 150%;
    background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 60%);
    top: -25%;
    left: -25%;
}

.project-thumb-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    background-color: var(--bg-secondary);
    color: var(--accent-color);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
}

.project-icon {
    font-size: 3rem;
}

.project-body {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.project-desc {
    font-size: 0.925rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tag {
    font-size: 0.8rem;
    background-color: #f1f5f9;
    color: var(--text-secondary);
    padding: 3px 8px;
    border-radius: 4px;
}

/* --- お問い合わせ (Contact) --- */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 48px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.contact-info-section {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-info-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-info-desc {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.contact-item-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: #eff6ff;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 600;
}

.contact-item-text h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.contact-item-text p {
    font-size: 0.95rem;
    font-weight: 600;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-primary);
    font-size: 0.95rem;
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition-smooth);
}

.form-control:focus {
    border-color: var(--accent-color);
    background-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* --- フッター --- */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- レレスポンシブ対応 --- */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.75rem;
    }
    .avatar-container {
        width: 260px;
        height: 260px;
    }
    .avatar {
        font-size: 5rem;
    }
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
    .hero {
        padding-top: 80px;
    }
    .hero-wrapper {
        flex-direction: column-reverse;
        text-align: center;
        gap: 32px;
    }
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-buttons {
        justify-content: center;
    }
    .about-card {
        flex-direction: column;
        padding: 32px;
        gap: 32px;
    }
    .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 32px;
        gap: 40px;
    }
    .nav-list {
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    .btn {
        width: 100%;
    }
    .about-details {
        grid-template-columns: 1fr;
    }
}