* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Noto Sans JP", sans-serif;
}

/* 全体 */
body {
    background: #cfcfcf;
}

/* ヘッダー */
.header {
    background: #3f3f3f;
    color: #fff;
    display: flex;
    align-items: center;
    padding: 12px 20px;
}

.logo {
    height: 80px;
    margin-right: 20px;
}

.header-nav a {
    color: #fff;
    text-decoration: none;
    margin-right: 18px;
    font-size: 14px;
}

.page-title{
    text-align: center;
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
    margin: 28px 0 4px;
    letter-spacing: 0.04em;
    text-shadow: 0 2px 6px rgba(0,0,0,0.6);
}

.note{
    text-align: center;
    color: #ffffff;
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.6;
}

/* =========================
   プレビュー外枠
========================= */
.preview-wrapper{
    width: 95%;
    max-width: 1200px;
    margin: 0 auto 48px;
    background: linear-gradient(#1a1a1a, #0f0f0f);
    border-radius: 18px;
    padding: 16px;
    border: 0.5px solid #0b2c3a;
    box-shadow:
        0 12px 30px rgba(0,0,0,0.6),
        inset 0 0 0 1px rgba(255,255,255,0.05);
}

/* =========================
   プレビュー本体
========================= */
.preview-frame{
    width: 100%;
    height: 78vh;
    border: none;
    border-radius: 12px;
    background: #ffffff;
    box-shadow:
        inset 0 0 0 1px #ccc,
        0 6px 18px rgba(0,0,0,0.4);
}