:root {
    --bg-dark: #070b12;
    --bg-card: #0f1624;
    --text-white: #ffffff;
    --text-gray: #94a3b8;
    --accent-blue: #00d2ff;
    --accent-green: #39ff14;
    --border-color: #1e293b;
}

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

html {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-white);
    scroll-behavior: smooth;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--accent-blue);
    margin-bottom: 2rem;
    position: relative;
    padding-left: 1rem;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background-color: var(--accent-blue);
}

/* ==========================================
   Header（ヘッダー）
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(7, 11, 18, 0.85);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.header__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header__logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.header__nav-list {
    display: flex;
    gap: 2rem;
}

.header__nav-link {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    transition: color 0.3s;
}

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

/* ==========================================
   Hero（メインビジュアル ★横並びと光のエフェクト）
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem; /* ヘッダーの被りを防ぐ余白 */
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

.hero__inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column; /* スマホでは縦並び */
    align-items: center;
    gap: 3rem;
}

@media (min-width: 992px) {
    .hero__inner {
        flex-direction: row; /* パソコンでは横並び */
        justify-content: space-between;
    }
}

.hero__content {
    width: 100%;
    max-width: 600px;
}

.hero__sub-title {
    font-size: 1.2rem;
    color: var(--text-gray);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.hero__title {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    line-height: 1.1;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.hero__lead {
    font-size: 1.8rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
    font-weight: 300;
}

/* 資格バッジ（イメージ通りのネオン発光） */
.hero__badges {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap; /* スマホで折り返せるように */
}

.badge {
    padding: 0.5rem 1.2rem;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: 6px;
    letter-spacing: 0.05em;
}

/* 各バッジのカラー発光エフェクト */
.badge--ccna {
    background-color: rgba(0, 210, 255, 0.1);
    border: 2px solid #00d2ff;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.5);
}

.badge--lpic {
    background-color: rgba(239, 68, 68, 0.1);
    border: 2px solid #ef4444;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.5);
}

.badge--azure {
    background-color: rgba(59, 130, 246, 0.1);
    border: 2px solid #3b82f6;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.5);
}

.badge--security {
    background-color: rgba(168, 85, 247, 0.1);
    border: 2px solid #a855f7;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.5);
}

.badge--boki {
    background-color: rgba(234, 179, 8, 0.1);
    border: 2px solid #eab308;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(234, 179, 8, 0.5);
}

/* 右側の画像エリア（ネオン枠のエフェクト） */
.hero__image-wrapper {
    width: 100%;
    max-width: 500px;
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid var(--accent-blue);
    box-shadow: 0 0 30px rgba(0, 210, 255, 0.4); /* 画像の周りの青い光 */
    transition: transform 0.3s;
}

.hero__image-wrapper:hover {
    transform: scale(1.02);
}

.hero__image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* ==========================================
   About & Timeline（経歴）
   ========================================== */
.about {
    padding: 8rem 2rem 5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.about__text {
    font-size: 1.1rem;
    color: var(--text-gray);
    max-width: 800px;
    margin-bottom: 4rem;
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    width: 2px;
    height: 100%;
    background-color: var(--border-color);
}

.timeline__item {
    position: relative;
    margin-bottom: 3rem;
}

.timeline__item::before {
    content: '';
    position: absolute;
    left: calc(-2rem - 5px);
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue);
}

.timeline__date {
    font-family: monospace;
    color: var(--accent-blue);
    font-size: 1rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
}

.timeline__title {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.timeline__description {
    color: var(--text-gray);
    max-width: 800px;
}

/* ==========================================
   Strengths（強みカード）
   ========================================== */
.strengths {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.strengths__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    border-radius: 8px;
    transition: transform 0.3s, border-color 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
}

.card__title {
    font-size: 1.2rem;
    color: var(--text-white);
    margin-bottom: 1rem;
}

.card__text {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* ==========================================
   Works（実績紹介）
   ========================================== */
.works {
    padding: 5rem 2rem 8rem;
    max-width: 1200px;
    margin: 0 auto;
}

.work-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    padding: 3rem 2.5rem;
}

.work-card__title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.work-card__text {
    color: var(--text-gray);
    margin-bottom: 2rem;
}

.work-card__links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 4px;
    transition: all 0.3s;
    text-align: center;
}

.btn--primary {
    background-color: var(--accent-blue);
    color: var(--bg-dark);
}

.btn--primary:hover {
    background-color: #00b8d4;
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.4);
}

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

.btn--secondary:hover {
    border-color: var(--text-white);
    background-color: rgba(255, 255, 255, 0.05);
}

/* ==========================================
   Footer（フッター）
   ========================================== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    text-align: center;
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* レスポンシブ調整 */
@media (max-width: 768px) {
    .hero__title {
        font-size: 2.8rem;
    }
    .hero__lead {
        font-size: 1.4rem;
    }
    .header__nav {
        display: none;
    }
}