/* 基本スタイル */
body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: #f8fafc;
    color: #334155;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex-grow: 1;
}

/* ハンバーガーメニュー */
.hamburger-btn {
    z-index: 1003;
}
.hamburger-btn div {
    width: 24px;
    height: 2px;
    background-color: #334155;
    margin: 5px 0;
    transition: 0.4s;
}

.hamburger-btn.open .bar1 {
    transform: rotate(-45deg) translate(-5px, 5px);
}
.hamburger-btn.open .bar2 {
    opacity: 0;
}
.hamburger-btn.open .bar3 {
    transform: rotate(45deg) translate(-5px, -5px);
}

.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1002;
    top: 0;
    right: 0;
    background-color: #ffffff;
    overflow-x: hidden;
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding-top: 60px;
    box-shadow: -4px 0 15px rgba(0,0,0,0.1);
}

.sidenav a {
    padding: 12px 16px 12px 32px;
    text-decoration: none;
    font-size: 16px;
    color: #475569;
    display: block;
    transition: 0.2s;
    font-weight: 500;
}

.sidenav a:hover {
    background-color: #f1f5f9;
    color: #2563eb;
}

.sidenav .menu-separator {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #e2e8f0;
}

.sidenav .sub-link {
    font-size: 14px;
    color: #94a3b8;
    padding-left: 40px;
    padding-top: 8px;
    padding-bottom: 8px;
}

.sidenav .sub-link:hover {
    color: #64748b;
}

.sidenav .version-info {
    position: absolute;
    bottom: 20px;
    right: 20px;
    font-size: 12px;
    color: #cbd5e1;
}

#menuOverlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: rgba(15, 23, 42, 0.5);
    z-index: 1001;
    cursor: pointer;
    backdrop-filter: blur(2px);
}

.hidden { display: none !important; }

/* ▼ 追加: ドラッグ＆ドロップ用のスタイル ▼ */
.drag-handle {
    cursor: grab;
}
.drag-handle:active {
    cursor: grabbing;
}
.sortable-ghost {
    opacity: 0.4;
    background-color: #e2e8f0;
    border: 2px dashed #94a3b8;
}