/* 全ページ共通のヘッダー（header.js が差し込む）。色の変数は各ページの :root */

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-gray-200);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
}

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

.nav-links a {
    color: #222;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-primary);
}

.header-cta {
    display: flex;
    gap: 12px;
}

.github-card {
    display: flex;
    align-items: center;
    gap: 10px;
    height: 44px;
    padding: 0 14px 0 12px;
    background: #fdfdfd;
    color: #202020;
    box-shadow: 0 0 0 1px #000;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.1;
    text-decoration: none;
}

.github-card small {
    display: block;
    font-size: 10px;
    font-weight: 400;
}

.store-badge {
    display: block;
    line-height: 0;
    box-shadow: 0 0 0 1px #000;
    border-radius: 5px;
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: #222;
    margin: 6px 0;
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 999;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-nav.active {
    max-height: 400px;
}

.mobile-nav ul {
    list-style: none;
    padding: 16px 0;
}

.mobile-nav li {
    padding: 0;
}

.mobile-nav a {
    display: block;
    padding: 8px 40px;
    color: #222;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
}

.mobile-nav a:hover {
    background: rgba(139, 92, 246, 0.05);
    color: var(--color-primary);
}

@media (max-width: 960px) {
    .nav-links { display: none; }
    .header-cta { display: none; }
    .mobile-menu-btn { display: block; }
    .mobile-nav { display: block; }
}