:root{
    --header-height: 80px;
    --max-width: 600px;
    --note-pc-width: 450px;
    --bg: #f8f9fb;
    --accent: #111827;
    --overlay-bg: rgba(0,0,0,0.38);
    --menu-width: 100%;
    --transition-speed: 360ms;
}
*{box-sizing:border-box}
html,body{height:100%;scroll-behavior: smooth;}
body{
    margin:0;
    font-family:-apple-system, "Hiragino Kaku Gothic ProN","Noto Sans JP", "Segoe UI", Roboto, Arial;
    background:var(--bg);
    color:#111;
    -webkit-font-smoothing:antialiased;
}
#main{
    /* padding-top: var(--header-height); */
}
/* ページコンテナ */
.page {
    width:100%;
    max-width:var(--max-width);
    margin:0 auto;
    min-height:100vh;
    background:white;
    overflow: hidden;
}

header button {
    color:#111;
}
/* ヘッダー（固定だが z-index は overlay より低め） */
header.app-header{
    position: fixed;
    top:0;
    width: 100%;
    max-width:var(--max-width);
    height:var(--header-height);
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 12px;
    background:linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.95));
    border-bottom:1px solid rgba(0,0,0,0.06);
    z-index:1200; /* overlay より低く */
    backdrop-filter: blur(2px);
    display: none;
}
.logo{ display:flex; align-items:center; gap:8px; text-decoration:none; color:var(--accent); font-weight:700; font-size:16px; }

/* ハンバーガー */
.hamburger,.menuClose{ width:42px; height:36px; display:inline-grid; place-items:center; border:0; background:transparent; cursor:pointer; }
.hamburger .bars{ position:relative; width:32px; height:2px; background:var(--accent); transition: transform var(--transition-speed) ease; }
.hamburger .bars::before, .hamburger .bars::after{ content:""; position:absolute; left:0; width:32px; height:2px; background:var(--accent); transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease; }
.hamburger .bars::before{ top:-10px; } .hamburger .bars::after{ top:10px; }
.hamburger[aria-expanded="true"] .bars{ transform: rotate(45deg); }
.hamburger[aria-expanded="true"] .bars::before{ transform: rotate(90deg); top:0; }
.hamburger[aria-expanded="true"] .bars::after{ opacity:0; transform: translateX(6px); }

.overlay{
    position:fixed;
    inset:0;
    display:flex;
    z-index:1300; /* ヘッダー(1200) より上 */
    align-items:flex-start;
    pointer-events:none; /* closed時は透過 */
    visibility: hidden;
}
.overlay.is-open{ 
    display:flex; 
    pointer-events:auto; 
    visibility: visible;
}

/* 背景（クリックで閉じる） */
.overlay__bg{
    position:absolute;
    inset:0;
    background:var(--overlay-bg);
    transition: opacity var(--transition-speed) ease;
    opacity:0;
    backdrop-filter: blur(3px);
}
.overlay.is-open .overlay__bg{ opacity:1; }

/* サイドメニュー：コンテンツの上に重なる */
.side-menu{
    position:relative;
    margin:auto;
    width:var(--menu-width);
    max-width:var(--max-width);
    height:100%;
    background:#ffffff;
    box-shadow: 0 16px 40px rgba(2,6,23,0.28);
    transform: translateX(-110%);
    transition: transform calc(var(--transition-speed)) cubic-bezier(.22,.9,.35,1), opacity calc(var(--transition-speed));
    overflow-y:auto;
    -webkit-overflow-scrolling:touch;
    will-change: transform;
    z-index:1310; /* overlay 内でも上に出す */
    opacity:0.98;

}
.side-menu-pc{
    background:#ffffff;
    background:url(../img/menu-pc.png);
    min-height: 586px;
    padding:83px 0 60px;
}
.side-menu-pc nav a{
    font-size: 1vw;
    font-family:"Noto Sans JP",sans-serif;
    padding: 12px 32px;
    display: flex;
    text-decoration: none;
    color: #4E1213;
    font-weight: bold;
    justify-content: space-between;
    align-items: center;
    gap: 32px;
}
.side-menu-pc nav a:hover{
    opacity: .5;
}
.side-menu-pc nav a svg{
    flex: 0 0 auto;
}
.side-menu-pc nav a:nth-child(odd){
    background:rgba(255,255,255,.5);
    min-height: 56px;
}
.side-menu-pc nav a:nth-child(even){
    min-height: 72px;
}
.overlay.is-open .side-menu{
    transform: translateX(0);
    opacity:1;
}
.menuClose {
    position: relative;
}
.menuClose .close-icon{
    width: 32px;        /* × を描く領域 */
    height: 36px;
    display: inline-block;
    position: relative;
    box-sizing: border-box;
}

/* × を2本線で描画 */
.menuClose .close-icon::before,
.menuClose .close-icon::after{
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 2px;           /* 線の太さ */
    transform-origin: center;
    background: #111827;   /* 線の色（アイコン色） */
    transition: transform 180ms ease, background 180ms ease;
}

/* 斜めに回転させて X にする */
.menuClose .close-icon::before{ transform: translateY(-50%) rotate(45deg); }
.menuClose .close-icon::after { transform: translateY(-50%) rotate(-45deg); }
.menuClose::after{
    position: absolute;
    content: "閉じる";
    bottom: -1em;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    width: 100%;
    text-align: center;
    letter-spacing: -1px;
}
.icon-label {
    font-size: 10px;
}

.side-menu header{ 
    display:flex; 
    align-items:center; 
    justify-content:flex-end; 
    gap:8px; 
    margin-bottom:12px; 
    padding: 0 12px;
    height: var(--header-height);
}
.side-menu nav{
    padding: 18px;
}
.side-menu nav a{ display:block; padding:12px 8px; text-decoration:none; color:var(--accent); border-radius:8px; }
.side-menu nav a:focus, .side-menu nav a:hover{ background:#f1f5f9; outline:none; }

[id] {
  scroll-margin-top: var(--header-height);
}

footer.page-footer{ padding:18px 12px; text-align:center; color:#666; font-size:13px; }

/* フラッシュメッセージ関連 */
.flash {
    width: 100%;
    position: fixed;
    text-align: center;
    z-index:2000;
    font-size: clamp(18px, 3vw, 26px);
    line-height: clamp(22px, 3.7vw, 28px);
}
.flash-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}
.flash-error {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

@media (max-width:420px){
    header.app-header{ padding:0 10px; }
    .side-menu header{ padding:0 10px; }
}

header.app-header{
    opacity: 0;
    visibility: hidden;
    transition: all .5s;
    transition-behavior: allow-discrete;
}

header.app-header.show{
    opacity: 1;
    visibility: visible;
}
.banner-area-mb{
     opacity: 0;
    visibility: hidden;
    transition: all .5s;
    transition-behavior: allow-discrete;
}
.banner-area-mb.show{
    opacity: 1;
    visibility: visible;
}


.banner-area-mb::after {
  content: '';
  position: absolute;
  top:0; left:-100%;
  width:100%; height:100%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,.4), transparent);
  animation: shine 1.2s ease-out forwards infinite;
}
footer{
    padding:0 16px 32px;
    font-size: 12px;
    text-align: center;
}
@keyframes shine {
  0% { left:-100%;}
  100% { left:100%; }
}


@keyframes scale1 {
  0% { transform:scale(1)}
  100% {transform:scale(1.01)}
}