/* ============================================================
   カスタムカラー変数
   ライト: メインアクセントに #1A6CF5（鮮やかな中明度の青）を使用
   ダーク : ニュートラルグレー背景 × ティールグリーンアクセント
   ============================================================ */
:root,
[data-bs-theme="light"] {
    --color-bg:           #f0f4ff;        /* 極薄い青みがかった白 */
    --color-surface:      #ffffff;
    --color-surface-2:    #e8eef9;        /* セクション背景の薄青 */
    --color-text:         #1a1f36;        /* 濃紺寄りのテキスト */
    --color-text-muted:   #4a5270;
    --color-accent:       #1A6CF5;        /* メインブルー */
    --color-accent-dark:  #1358cc;        /* ホバー時 */
    --color-accent-light: #dce8ff;        /* バッジ背景等 */
    --color-border:       #c8d5ef;
    --color-navbar-bg:    rgba(255, 255, 255, 0.92);
    --shadow-sm:          0 2px 8px  rgba(26, 108, 245, 0.08);
    --shadow-md:          0 4px 20px rgba(26, 108, 245, 0.13);
    --blog-body-text:     #2e3452;  /* contrast ratio ~12.5:1 on #f0f4ff (WCAG AAA) */
}

[data-bs-theme="dark"] {
    --color-bg:           #161b1e;        /* 青みなし・ニュートラルな暗グレー */
    --color-surface:      #1f2528;        /* カード背景 */
    --color-surface-2:    #252c30;        /* セクション背景 */
    --color-text:         #dde3e7;        /* やや温かみのある白 */
    --color-text-muted:   #7d9099;
    --color-accent:       #2dd4bf;        /* ティールグリーン */
    --color-accent-dark:  #14b8a6;        /* ホバー時 */
    --color-accent-light: #0f2e2b;        /* バッジ背景等 */
    --color-border:       #2e3a3f;
    --color-navbar-bg:    rgba(22, 27, 30, 0.95);
    --shadow-sm:          0 2px 8px  rgba(0, 0, 0, 0.45);
    --shadow-md:          0 4px 20px rgba(0, 0, 0, 0.55);
    --blog-body-text:     var(--color-text);  /* ダークモードはメインテキスト色をそのまま使用 */
}

/* ============================================================
   ベースリセット
   ============================================================ */
html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* ============================================================
   ナビゲーションバー
   ============================================================ */
.navbar-custom {
    background-color: var(--color-navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.navbar-custom .navbar-brand {
    color: var(--color-accent);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.navbar-custom .nav-link {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
    padding-bottom: 0.25rem;
    transition: color 0.2s;
}

.navbar-custom .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    border-radius: 2px;
    transition: width 0.25s ease;
}

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

.navbar-custom .nav-link:hover::after {
    width: 70%;
}

.navbar-custom .navbar-toggler {
    border-color: var(--color-border);
}

[data-bs-theme="dark"] .navbar-custom .navbar-toggler-icon {
    filter: invert(1);
}

/* テーマ切替ボタン */
.btn-theme-toggle {
    background: transparent;
    border: 1.5px solid var(--color-border);
    border-radius: 50%;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--color-text);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
    padding: 0;
}

.btn-theme-toggle:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

[data-bs-theme="light"] .theme-icon-dark,
[data-bs-theme="dark"]  .theme-icon-light {
    display: none;
}

/* ============================================================
   ヒーローセクション
   ============================================================ */
.hero-section {
    padding: 6rem 0 5rem;
    background: linear-gradient(
        135deg,
        var(--color-surface) 0%,
        var(--color-surface-2) 100%
    );
}


.profile-image {
    width: 260px;
    height: 260px;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid var(--color-surface);
    box-shadow: var(--shadow-md);
}

.profile-avatar {
    width: 260px;
    height: 260px;
    border-radius: 50%;
    border: 4px solid var(--color-surface);
    box-shadow: var(--shadow-md);
    background: linear-gradient(
        145deg,
        var(--color-accent) 0%,
        var(--color-accent-dark) 100%
    );
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 5.25rem;
    font-weight: 900;
    letter-spacing: -0.04em;
    color: #ffffff;
    user-select: none;
    white-space: nowrap;
    overflow: hidden;
    transition: width 0.4s ease, height 0.4s ease, border-radius 0.4s ease, font-size 0.35s ease, letter-spacing 0.35s ease;
}

.profile-avatar.avatar-expanded {
    width: 460px;
    max-width: 100%;
    height: 108px;
    border-radius: 54px;
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    padding: 0 2rem;
}

.profile-avatar.avatar-expanded #av-c {
    margin-left: 0.35em;
}

/* ①タイトル：大きく・太く */
.hero-title {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--color-text);
}


/* ②キャッチコピー：タイトルより小さめ */
.hero-catchcopy {
    font-size: clamp(1rem, 2.2vw, 1.3rem);
    font-weight: 600;
    color: var(--color-accent);
    line-height: 1.5;
}

.hero-sub {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* GitHub ボタン ③ */
.btn-github {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 1.6rem;
    background-color: #24292f;
    color: #ffffff;
    border-radius: 0.6rem;
    font-weight: 700;
    font-size: 0.95rem;
    text-decoration: none;
    border: 1.5px solid #444c56;
    transition: background-color 0.2s, transform 0.15s, box-shadow 0.2s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.btn-github:hover {
    background-color: #1a1e24;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

.btn-github-arrow {
    margin-left: 0.15rem;
    transition: transform 0.2s;
}

.btn-github:hover .btn-github-arrow {
    transform: translateX(3px);
}

/* ヒーローのスキルバッジ */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.9rem;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    border: 1px solid var(--color-border);
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
}

/* ============================================================
   セクション共通
   ============================================================ */
.section-alt {
    background-color: var(--color-surface-2);
}

.section-plain {
    background-color: var(--color-surface);
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text);
    position: relative;
    display: inline-block;
    padding-bottom: 0.6rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 2.5rem;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
}

/* ============================================================
   スキルセクション（カードなし：ロゴ＋名前のみ）
   ============================================================ */
.skill-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0.5rem;
}


.skill-icon {
    font-size: 2.75rem;
    line-height: 1;
}

/* SVG img タグで読み込むアイコン（Python / JavaScript 等） */
.skill-icon-img {
    width: 2.75rem;
    height: 2.75rem;
    object-fit: contain;
}

/* static_img タイプ（背景付き公式ロゴ画像） */
.skill-icon-img--logo {
    width: auto;
    height: 2.75rem;
    max-width: 5.5rem;
    border-radius: 0.4rem;
    object-fit: contain;
}

/* ① Django: ダークモードでは白く表示 */
[data-bs-theme="dark"] .skill-item .devicon-django-plain {
    filter: brightness(0) invert(1);
}

.skill-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-align: center;
}

/* Web Security はアイコンがないため代替表示 */
.skill-icon-text {
    font-size: 1rem;
    font-weight: 800;
    color: var(--color-accent);
    width: 2.75rem;
    height: 2.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2.5px solid var(--color-accent);
    border-radius: 0.5rem;
    letter-spacing: -0.04em;
}

.skill-icon-text--owasp {
    font-family: 'Oswald', sans-serif;
    font-size: 1rem;
    letter-spacing: 0.04em;
    border: none;
    flex-direction: column;
    line-height: 1.35;
    text-align: center;
}

/* ============================================================
   プロジェクトカード
   ============================================================ */
.project-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.875rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.22s ease, box-shadow 0.22s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

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

.project-card-thumb {
    width: 100%;
    height: 200px;
    object-fit: cover;
    flex-shrink: 0;
}

.project-card .card-body {
    padding: 1.5rem;
    flex: 1;
}

.project-card-summary {
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.screenshot-thumb {
    cursor: pointer;
}

.screenshot-thumb img {
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.screenshot-thumb:hover img {
    opacity: 0.85;
    transform: scale(1.02);
}

/* ============================================================
   ブログカード（TOPページ用・横長レイアウト）
   ============================================================ */
.blog-card-row {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.875rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.22s ease, box-shadow 0.22s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: stretch;
    overflow: hidden;
}

.blog-card-row:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    color: inherit;
}

.blog-card-row-thumb {
    width: 180px;
    min-width: 180px;
    object-fit: cover;
    flex-shrink: 0;
}

.blog-card-row-thumb--empty {
    background-color: var(--color-surface-2);
    display: flex;
    align-items: center;
    justify-content: center;
}

.blog-card-row-icon {
    font-size: 2.25rem;
    color: var(--color-text-muted);
    opacity: 0.5;
}

.blog-card-row-body {
    flex: 1;
    padding: 1.25rem 3rem 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.blog-card-row-title {
    font-size: 1rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-card-row-excerpt {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.65;
}


/* ============================================================
   ブログカード（一覧ページ用 .blog-card は以降に定義）
   ============================================================ */
.blog-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.875rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.blog-card .card-body {
    padding: 1.25rem 1.5rem;
}

/* ============================================================
   ボタン
   ============================================================ */
.btn-accent {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background-color: var(--color-accent);
    border: none;
    color: #fff;
    padding: 0.6rem 1.8rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: background-color 0.2s, transform 0.15s;
}

.btn-accent:hover {
    background-color: var(--color-accent-dark);
    color: #fff;
    transform: translateY(-1px);
}

.btn-outline-accent {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    border: 1.5px solid var(--color-accent);
    color: var(--color-accent);
    padding: 0.6rem 1.8rem;
    font-weight: 600;
    border-radius: 0.5rem;
    background: transparent;
    transition: background-color 0.2s, color 0.2s, transform 0.15s;
}

.btn-outline-accent:hover {
    background-color: var(--color-accent);
    color: #fff;
    transform: translateY(-1px);
}

.btn-youtube {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background-color: #e03535;
    border: none;
    color: #fff;
    padding: 0.6rem 1.8rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: background-color 0.2s, transform 0.15s;
    text-decoration: none;
}

.btn-youtube:hover {
    background-color: #c42b2b;
    color: #fff;
    transform: translateY(-1px);
}

/* ============================================================
   フッター
   ============================================================ */
.footer-custom {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

.footer-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* ============================================================
   ユーティリティ
   ============================================================ */
.text-muted-custom  { color: var(--color-text-muted) !important; }
.text-accent        { color: var(--color-accent) !important; }
.bg-surface         { background-color: var(--color-surface) !important; }
.border-custom      { border-color: var(--color-border) !important; }

.project-thumbnail {
    max-height: 360px;
    object-fit: cover;
    width: 100%;
}

.placeholder-box {
    padding: 2.5rem;
    border: 1.5px dashed var(--color-border);
    border-radius: 0.75rem;
    text-align: center;
    color: var(--color-text-muted);
}

/* ============================================================
   ブログ一覧
   ============================================================ */
.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.75rem;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    border: 1px solid var(--color-border);
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
}

.filter-chip-close {
    color: var(--color-accent);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.filter-chip-close:hover {
    opacity: 1;
    color: var(--color-accent);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.blog-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    height: 100%;
}

.blog-card-link:hover .blog-card {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.blog-card-thumbnail {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: 0.75rem 0.75rem 0 0;
}

.blog-card-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.5;
}

.blog-card-excerpt {
    font-size: 0.875rem;
    color: var(--blog-body-text);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hero-badge--sm {
    font-size: 0.72rem;
    padding: 0.2rem 0.6rem;
}

.search-input {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: 0.5rem 0 0 0.5rem;
}

.search-input:focus {
    background-color: var(--color-surface);
    border-color: var(--color-accent);
    color: var(--color-text);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.12);
    outline: none;
}

.btn-search {
    background-color: var(--color-accent);
    border: 1px solid var(--color-accent);
    color: #fff;
    border-radius: 0 0.5rem 0.5rem 0;
    padding: 0.5rem 1rem;
}

.btn-search:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: #fff;
}

/* ページネーション */
.page-link {
    background-color: var(--color-surface);
    border-color: var(--color-border);
    color: var(--color-accent);
}

.page-link:hover {
    background-color: var(--color-surface-2);
    border-color: var(--color-border);
    color: var(--color-accent-dark);
}

.page-item.active .page-link {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

/* ============================================================
   ブログ詳細
   ============================================================ */
.blog-detail-thumbnail {
    width: 100%;
    max-height: 420px;
    object-fit: cover;
}

.blog-nav-link {
    text-decoration: none;
    color: var(--color-accent);
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.2s;
}

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

/* Markdownレンダリング */
.blog-content {
    & h1, & h2, & h3, & h4, & h5, & h6 {
        color: var(--color-text);
        font-weight: 700;
        margin-top: 2.25rem;
        margin-bottom: 0.75rem;
        line-height: 1.3;
    }

    & h1 { font-size: 1.75rem; }
    & h2 { font-size: 1.4rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.4rem; }
    & h3 { font-size: 1.15rem; }

    & p, & li {
        color: var(--blog-body-text);
        line-height: 1.9;
        margin-bottom: 1.25rem;
    }

    & a {
        color: var(--color-accent);
        text-decoration: underline;
    }

    & pre {
        background-color: var(--color-surface-2);
        border: 1px solid var(--color-border);
        border-radius: 0.5rem;
        padding: 1.25rem;
        overflow-x: auto;
    }

    & code {
        background-color: var(--color-surface-2);
        border-radius: 0.25rem;
        padding: 0.15em 0.4em;
        font-size: 1.15em;
    }

    & pre code {
        background: none;
        padding: 0;
    }

    & blockquote {
        border-left: 4px solid var(--color-accent);
        padding-left: 1rem;
        color: var(--color-text);
        opacity: 0.8;
        margin: 1.5rem 0;
        font-style: italic;
    }

    & img {
        max-width: 100%;
        border-radius: 0.5rem;
    }

    & ul, & ol {
        padding-left: 1.5rem;
        margin-bottom: 1.25rem;
    }
}

/* ============================================================
   お問い合わせフォーム
   ============================================================ */
.contact-label {
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
}

.contact-required {
    color: var(--color-accent);
}

.contact-error {
    color: #dc3545;
    font-size: 0.85rem;
    margin-top: 0.3rem;
}

.form-control {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: 0.5rem;
}

.form-control:focus {
    background-color: var(--color-surface);
    border-color: var(--color-accent);
    color: var(--color-text);
    box-shadow: 0 0 0 3px rgba(26, 108, 245, 0.12);
}

.form-control::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
}

.contact-alert-success {
    background-color: var(--color-accent-light);
    border: 1px solid var(--color-border);
    color: var(--color-accent);
    border-radius: 0.75rem;
    padding: 1rem 1.25rem;
}

/* ============================================================
   レスポンシブ
   ============================================================ */
/* タブレット縦向き（iPad Mini 768 / iPad Air 820 / Surface Pro 7 912 等） */
@media (min-width: 768px) and (max-width: 991.98px) {
    .profile-avatar.avatar-expanded {
        width: 100%;
        max-width: 400px;
        height: 96px;
        border-radius: 48px;
        font-size: 1.8rem;
        padding: 0 1.5rem;
    }
}

@media (max-width: 767.98px) {
    .hero-section { padding: 4rem 0 3rem; }
    .profile-image  { width: 180px; height: 180px; }
    .profile-avatar { width: 180px; height: 180px; font-size: 3.75rem; }
    .profile-avatar.avatar-expanded {
        width: 340px;
        height: 84px;
        border-radius: 42px;
        font-size: 2rem;
        padding: 0 1.25rem;
    }
}

@media (max-width: 575.98px) {
    .blog-card-row-thumb { display: none; }
}