:root {
    /* 画像のサイバーパンク・ミッドナイトネイビー + ネオンシアン */
    --bg-color: #08111e;
    --card-bg: #131c30;
    --primary: #3aaeff;
    --secondary: #6cc7ff;
    --text-main: #d4dceb;
    --text-muted: #7d8ba2;
    --border-color: #1f2e4a;
    --heading-color: #ffffff;
    --header-bg: rgba(13, 22, 38, 0.6);
    --footer-bg: #050a14;
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --card-bg: #f6f8fa;
    --primary: #0233FD;
    --secondary: #1730C4;
    --text-main: #1c1917;
    --text-muted: #57534e;
    --border-color: #d8d6d0;
    --heading-color: #0a0a0a;
    --header-bg: rgba(255, 255, 255, 0.6);
    --footer-bg: #f1eff0;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
}

/* --- 共通ヘッダー --- */
.global-header {
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    align-self: stretch;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.global-header .logo-link {
    display: inline-flex;
    align-items: center;
    line-height: 0;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.global-header .logo-link:hover {
    opacity: 0.75;
}

.global-header .wave-logo {
    height: 28px;
    width: auto;
    display: block;
}

/* デフォルト(=dark)はダークBG → 白っぽいロゴ(is-dark) を表示 */
.global-header .wave-logo.is-light { display: none; }
.global-header .wave-logo.is-dark  { display: block; }
[data-theme="light"] .global-header .wave-logo.is-light { display: block; }
[data-theme="light"] .global-header .wave-logo.is-dark  { display: none; }

.global-header nav {
    display: inline-flex;
    align-items: center;
    gap: 1.5rem;
}

.global-header nav a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: bold;
    transition: color 0.3s ease;
}

.global-header nav a:hover {
    color: var(--primary);
}

/* テーマ切替ボタン */
.global-header .theme-toggle {
    appearance: none;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-main);
    width: 36px;
    height: 36px;
    border-radius: 6px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.global-header .theme-toggle:hover {
    border-color: var(--text-main);
    color: var(--primary);
}

.global-header .theme-toggle svg {
    width: 16px;
    height: 16px;
    display: block;
}

/* デフォルト(=dark)は moon を表示 */
.global-header .theme-toggle .icon-sun  { display: none; }
.global-header .theme-toggle .icon-moon { display: block; }
[data-theme="light"] .global-header .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .global-header .theme-toggle .icon-moon { display: none; }


/* --- 共通フッター --- */
.global-footer {
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem 1rem;
    margin-top: auto;
    width: 100%;
    align-self: stretch;
    color: var(--text-main);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2rem;
}

.footer-section h3 {
    color: var(--heading-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary);
}

.footer-bottom {
    width: 100%;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}