/* common.css — 最小限の共通スタイル */

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

:root {
    --bg: #0a0a0a;
    --fg: #f0f0f0;
    --fg-dim: #ccc;
    --accent: #c4a0ff;
    --font-body: 'Helvetica Neue', 'Hiragino Sans', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
}

/* Header bar */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 36px;
    z-index: 500;
    background: rgba(10, 10, 10, 0.85);
    border-bottom: 1px solid rgba(196, 160, 255, 0.08);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.2rem;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: lowercase;
}

.site-header .site-name {
    color: var(--fg);
    text-decoration: none;
}

.site-header .site-name:hover {
    opacity: 0.7;
}

.site-header nav {
    display: flex;
    gap: 1.2rem;
}

.site-header nav a {
    color: var(--fg);
}

.site-header nav a:hover {
    opacity: 0.7;
}

/* レスポンシブ */
@media (max-width: 640px) {
    .site-header {
        padding: 0 0.75rem;
        font-size: 0.6rem;
    }

    .site-header nav {
        gap: 0.8rem;
    }
}