/* ===================================
   Achievement Single
   =================================== */
:root {
    --ac-inner-max: 800px;
}

/* ---- Header ---- */
.ac-header {
    padding: 48px 0 32px;
}

.ac-header__inner {
    max-width: var(--ac-inner-max);
    margin: 0 auto;
    padding: 0 30px;
}

/* パンくず */
.ac-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    font-size: 12px;
    color: #888;
    margin-bottom: 20px;
}

.ac-breadcrumb a {
    color: #888;
    text-decoration: none;
}

.ac-breadcrumb a:hover {
    text-decoration: underline;
}

.ac-breadcrumb__sep {
    color: #aaa;
}

/* 日付 */
.ac-header__date {
    display: block;
    font-size: 13px;
    color: #888;
    margin-bottom: 12px;
}

/* タイトル */
.ac-header__title {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.5;
    color: #222;
    margin: 0;
}

/* ---- 本文（エディタ） ---- */
.ac-body {
    padding: 0 0 40px;
}

.ac-body__inner {
    max-width: var(--ac-inner-max);
    margin: 0 auto;
    padding: 0 30px;
    box-sizing: border-box;
}

.ac-body__content {
    font-size: 16px;
    line-height: 1.9;
    color: #444;
}

.ac-body__content p {
    margin: 0 0 1.5em;
}

.ac-body__content p:last-child {
    margin-bottom: 0;
}

.ac-body__content h2 {
    font-size: 22px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 1.8em 0 0.8em;
    padding-bottom: 10px;
    border-bottom: 2px solid #e8e8e8;
}

.ac-body__content h3 {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 1.5em 0 0.6em;
}

.ac-body__content ul,
.ac-body__content ol {
    padding-left: 1.5em;
    margin: 0 0 1.5em;
}

.ac-body__content li {
    margin-bottom: 0.4em;
    line-height: 1.8;
}

/* --- テーブル --- */
.ac-body__content table {
    width: 100%;
    border-collapse: collapse;
    margin: 2em 0;
    font-size: 15px;
}

.ac-body__content th {
    background-color: #333333;
    color: #ffffff;
    font-weight: 700;
    padding: 12px 16px;
    text-align: left;
    letter-spacing: 0.03em;
    border: 1px solid #555;
}

.ac-body__content td {
    padding: 12px 16px;
    border: 1px solid #e8e8e8;
    vertical-align: top;
    line-height: 1.7;
}

.ac-body__content tr:nth-child(even) td {
    background-color: #f7f7f7;
}

@media (max-width: 600px) {
    .ac-body__content table {
        font-size: 13px;
    }

    .ac-body__content th,
    .ac-body__content td {
        padding: 8px 10px;
    }
}

/* ---- YouTube Video ---- */
.ac-video {
    padding: 0 0 48px;
}

.ac-video__inner {
    max-width: var(--ac-inner-max);
    margin: 0 auto;
    padding: 0 30px;
}

.ac-video__wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
}

.ac-video__wrap iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ---- Back Link ---- */
.ac-back {
    padding: 0 0 80px;
}

.ac-back__inner {
    max-width: var(--ac-inner-max);
    margin: 0 auto;
    padding: 0 30px;
}

.ac-back__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: #E97730;
    text-decoration: none;
    transition: opacity 0.2s;
}

.ac-back__link:hover {
    opacity: 0.7;
}

/* ===================================
   Tablet ( <= 1024px )
   =================================== */
@media (max-width: 1024px) {
    .ac-header__inner,
    .ac-video__inner,
    .ac-back__inner {
        padding: 0 32px;
    }
}

/* ===================================
   Mobile ( <= 768px )
   =================================== */
@media (max-width: 768px) {
    .ac-header {
        padding: 32px 0 24px;
    }

    .ac-header__inner,
    .ac-video__inner,
    .ac-back__inner {
        padding: 0 16px;
    }

    .ac-header__title {
        font-size: 22px;
    }

    .ac-video {
        padding-bottom: 36px;
    }

    .ac-back {
        padding-bottom: 60px;
    }
}