/* ============================================================
   プレミアムプラン紹介LP（/premium/）専用CSS
   ============================================================ */

/* ---------- SWELLのサイドバー付きレイアウトを全幅に上書き ---------- */
/* body:has() で /premium/ ページを判定（モダンブラウザ対応） */
body:has(.premium-page) .l-sidebar,
body:has(.premium-page) #side,
body:has(.premium-page) #right-side {
    display: none !important;
}

body:has(.premium-page) .l-mainContent,
body:has(.premium-page) .l-mainContent__inner,
body:has(.premium-page) .l-content,
body:has(.premium-page) .l-content__main,
body:has(.premium-page) .l-article__body,
body:has(.premium-page) .l-mainContent__body,
body:has(.premium-page) .l-mainContent .l-content,
body:has(.premium-page) .l-mainContent .l-container {
    max-width: 100% !important;
    width: 100% !important;
    padding: 0 !important;
    margin: 0 !important;
    display: block !important;
}

body:has(.premium-page) .l-mainContent.l-article {
    padding: 0 !important;
}

body:has(.premium-page) .post_content {
    padding: 0 !important;
    margin: 0 !important;
    max-width: 100% !important;
    width: 100% !important;
}

body:has(.premium-page) .c-pageTitle {
    display: none;
}

body:has(.premium-page) {
    overflow-x: hidden;
}

/* セクションは親コンテナ（.l-mainContent 等）が 100% 幅にオーバーライド済みなので
   width: 100% で十分。100vw + transform 手法は iPad などで右側に微小なズレが
   出ることがあるため使わない */
body:has(.premium-page) .premium-page > section {
    width: 100%;
    margin-left: 0;
    margin-right: 0;
}

.premium-page {
    --p-text: #333333;
    --p-text-muted: #999999;
    --p-red: #f55538;
    --p-red-light: #ffefe6;
    --p-blue: #8bbabb;
    --p-blue-light: #e6f2f2;
    --p-bg: #f4f3ee;
    --p-white: #ffffff;
    color: var(--p-text);
    font-family: "Yu Gothic", "游ゴシック", YuGothic, "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", sans-serif;
    line-height: 1.6;
}

.premium-page * {
    box-sizing: border-box;
}

.premium-page img {
    max-width: 100%;
    height: auto;
    display: block;
}

.prem-container {
    max-width: 853px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ---------- 共通: セクションヘッダー ---------- */
.prem-section-head {
    text-align: center;
    margin-bottom: 32px;
}

.prem-section-tag {
    display: inline-block;
    color: var(--p-red);
    font-size: 16px;
    font-weight: 700;
    border-bottom: 2px solid var(--p-red);
    padding: 4px 8px;
    margin-bottom: 16px;
}

.prem-section-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--p-text);
    margin: 0 0 8px;
}

.prem-section-note {
    font-size: 16px;
    color: var(--p-text);
    margin: 14px 0 0;
}

/* ---------- 共通: ボタン ---------- */
.prem-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 100px;
    font-weight: 700;
    font-size: 16px;
    text-decoration: none;
    transition: opacity 0.2s;
    line-height: 1.5;
    border: 1px solid transparent;
    white-space: nowrap;
    flex-shrink: 0;
}

.prem-btn:hover {
    opacity: 0.85;
    text-decoration: none;
}

.prem-btn--primary {
    background: var(--p-red);
    color: var(--p-white);
}

.prem-btn--primary:hover {
    color: var(--p-white);
}

.prem-btn--outline {
    background: var(--p-white);
    color: var(--p-red);
    border-color: var(--p-red);
}

.prem-btn--outline:hover {
    color: var(--p-red);
}

.prem-btn--white {
    background: var(--p-white);
    color: var(--p-text);
}

.prem-btn--white:hover {
    color: var(--p-text);
}

.prem-btn--full {
    width: 100%;
    text-align: center;
}

.prem-cta-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.prem-cta-group--center {
    justify-content: center;
}

.prem-tag {
    display: inline-block;
    background: var(--p-white);
    color: var(--p-text);
    border: 1px solid var(--p-text);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
    padding: 6px 10px;
    line-height: 1.4;
}

/* ---------- セクション共通間隔 ---------- */
.premium-page > section {
    padding: 48px 0 80px;
}

/* ---------- ヒーローセクション ---------- */
.prem-hero {
    background: var(--p-white);
}

.prem-hero__inner {
    display: flex;
    align-items: center;
    gap: 80px;
}

.prem-hero__visual {
    flex: 1 1 auto;
    min-width: 0;
}

.prem-hero__visual img {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}

.prem-hero__copy {
    flex: 0 0 auto;
    min-width: 380px;
}

.prem-hero__title {
    display: block;
    width: fit-content;
    font-size: 32px;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: 2px;
    margin: 16px 0;
    color: var(--p-text);
}

/* Figma準拠：3行のアンダーラインを最長行の幅に揃える */
/* padding-bottom 0 + margin-bottom で、アンダーラインを上の文字寄りに見せる */
.prem-hero__title-line {
    display: block;
    width: 100%;
    padding-bottom: 0;
    margin-bottom: 12px;
    border-bottom: 2px solid var(--p-text);
}

.prem-hero__title-line:last-child {
    margin-bottom: 0;
}

.prem-hero__lead {
    font-size: 16px;
    line-height: 1.8;
    margin: 0 0 32px;
    color: var(--p-text);
}

/* ---------- 課題セクション ---------- */
.prem-problems {
    background: var(--p-bg);
}

.prem-problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 32px 0 24px;
}

.prem-problem-card {
    background: var(--p-white);
    border-radius: 16px;
    padding: 24px 20px;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    line-height: 1.5;
}

.prem-problem-card p {
    margin: 0;
}

.prem-arrow-down {
    width: 0;
    height: 0;
    border-left: 60px solid transparent;
    border-right: 60px solid transparent;
    border-top: 22px solid #d9d9d9;
    margin: 0 auto 24px;
}

.prem-callout {
    background: var(--p-text);
    color: var(--p-white);
    border-radius: 16px;
    padding: 20px 48px;
    text-align: center;
    font-size: 20px;
    font-weight: 700;
    line-height: 1.8;
    position: relative;
}

/* 「ログイン不要のLMS」部分のオレンジ下線装飾 */
.prem-callout__highlight {
    text-decoration: underline;
    text-decoration-color: var(--p-red);
    text-decoration-thickness: 2px;
    text-underline-offset: 6px;
}

/* SPのみ表示する改行（PCでは無効化） */
.prem-sp-br {
    display: none;
}
@media (max-width: 768px) {
    .prem-sp-br {
        display: inline;
    }
}

.prem-callout p,
.premium-page .prem-callout p {
    margin: 0;
    color: var(--p-white);
}

/* ---------- 4つの特長セクション ---------- */
.prem-features {
    background: var(--p-blue-light);
}

.prem-feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.prem-feature-card {
    background: var(--p-white);
    border-radius: 16px;
    padding: 16px;
    position: relative;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.prem-feature-num {
    position: absolute;
    top: 9px;
    left: 36px;
    transform: translateX(-50%);
    font-size: 32px;
    font-weight: 700;
    color: var(--p-blue);
    line-height: 1.5;
}

.prem-feature-title {
    font-size: 20px;
    font-weight: 700;
    margin: 0;
    line-height: 1.5;
    color: var(--p-text);
}

.prem-feature-desc {
    font-size: 16px;
    line-height: 1.8;
    text-align: left;
    margin: 0;
    color: var(--p-text);
}

.prem-tag-list {
    display: flex;
    flex-wrap: nowrap;
    gap: 10px;
    justify-content: center;
    align-items: flex-start;
    margin-top: auto;
}

.prem-tag-list--center {
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 32px;
}

.prem-feature-tag {
    display: inline-flex;
    align-items: center;
    background: var(--p-red-light);
    color: var(--p-text);
    border-radius: 8px;
    padding: 5px 14px 5px 12px;
    font-size: 14px;
    font-weight: 700;
    line-height: 1.8;
    white-space: nowrap;
    flex-shrink: 0;
}

.prem-feature-tag::before {
    content: "";
    display: inline-block;
    width: 12px;
    height: 10px;
    margin-right: 6px;
    flex-shrink: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 10' fill='none'%3E%3Cpath d='M1 5L4.5 8.5L11 1.5' stroke='%23F55538' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center / contain;
}

.prem-feature-tag--blue {
    background: var(--p-blue-light);
}

.prem-feature-tag--blue::before {
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 10' fill='none'%3E%3Cpath d='M1 5L4.5 8.5L11 1.5' stroke='%238BBABB' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center / contain;
}

/* ---------- 使い方セクション ---------- */
.prem-howto {
    background: var(--p-white);
}

.prem-step-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.prem-step {
    background: var(--p-bg);
    border-radius: 16px;
    padding: 24px 32px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.prem-step__head {
    display: flex;
    align-items: center;
    gap: 20px;
    width: 280px;
    flex-shrink: 0;
}

.prem-step__num {
    width: 48px;
    height: 48px;
    background: var(--p-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    flex-shrink: 0;
}

.prem-step__title {
    font-size: 20px;
    font-weight: 700;
    margin: 0;
    line-height: 1.5;
    color: var(--p-text);
}

.prem-step__body {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 20px;
}

.prem-step__body p {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--p-text);
    flex: 1;
}

.prem-role-badge {
    display: inline-block;
    border-radius: 4px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.5;
    flex-shrink: 0;
}

.prem-role-badge--teacher {
    background: transparent;
    color: var(--p-text);
    border: 1px solid var(--p-text);
}

.prem-role-badge--student {
    background: var(--p-text);
    color: var(--p-white);
}

/* ---------- 料金プランセクション ---------- */
.prem-plans {
    background: var(--p-blue-light);
}

.prem-plan-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.prem-plan-card {
    border-radius: 16px;
    padding: 24px 32px 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.prem-plan-card .prem-btn {
    align-self: flex-start;
}

.prem-plan-card--free {
    background: var(--p-white);
    color: var(--p-text);
}

.prem-plan-card--paid {
    background: var(--p-text);
    color: var(--p-white);
}

.prem-plan-card__head {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.prem-plan-card__label {
    font-size: 14px;
    font-weight: 700;
    color: var(--p-text-muted);
}

.prem-plan-card__name {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.5;
    margin: 0;
}

.prem-plan-card--paid .prem-plan-card__name {
    color: var(--p-white);
}

.prem-plan-card__price {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    flex-wrap: wrap;
}

.prem-plan-card__price-num {
    font-size: 40px;
    font-weight: 700;
    line-height: 1;
}

.prem-plan-card__price-unit {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.5;
}

.prem-plan-card__price-note {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.5;
}

.prem-plan-card__features {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.prem-plan-card__features li {
    display: flex;
    align-items: center;
    gap: 6px;
    padding-left: 26px;
    position: relative;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.5;
}

.prem-plan-card__features li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 12px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 12' fill='none'%3E%3Cpath d='M1 6L6 11L15 1' stroke='%23F55538' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center / contain;
}

.prem-plan-card__feature-label {
    color: var(--p-text-muted);
}

.prem-plan-card--paid .prem-plan-card__feature-label {
    color: var(--p-text-muted);
}

.prem-plan-card__feature-value {
    color: var(--p-text);
}

.prem-plan-card--paid .prem-plan-card__feature-value {
    color: var(--p-white);
}

/* ---------- FAQセクション ---------- */
.prem-faq {
    background: var(--p-blue-light);
    padding-top: 0 !important;
}

.prem-faq-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.prem-faq-item {
    background: var(--p-white);
    border-radius: 16px;
    padding: 24px 32px;
}

.prem-faq-item summary {
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    list-style: none;
    -webkit-tap-highlight-color: transparent;
}

.prem-faq-item summary:focus {
    outline: none;
}

.prem-faq-item summary:focus-visible {
    outline: 2px solid var(--p-text);
    outline-offset: 2px;
}

.prem-faq-item summary::-webkit-details-marker {
    display: none;
}

.prem-faq-q {
    width: 32px;
    height: 32px;
    background: var(--p-text);
    color: var(--p-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    flex-shrink: 0;
}

.prem-faq-question {
    flex: 1;
    font-size: 16px;
    font-weight: 700;
    line-height: 1.5;
}

.prem-faq-arrow {
    width: 16px;
    height: 16px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M4 6L8 10L12 6' stroke='%23333' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat center / contain;
    transition: transform 0.2s;
    flex-shrink: 0;
}

.prem-faq-item[open] .prem-faq-arrow {
    transform: rotate(180deg);
}

.prem-faq-answer {
    margin: 16px 0 0 48px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--p-text);
}

/* ---------- 開発者の想いセクション ---------- */
.prem-developer {
    background: var(--p-white);
}

.prem-developer__inner {
    display: flex;
    align-items: center;
    gap: 80px;
}

.prem-developer__copy {
    flex: 1;
    min-width: 0;
}

.prem-developer__title {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.5;
    margin: 0 0 16px;
    color: var(--p-text);
}

.prem-developer__lead {
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    color: var(--p-text);
}

.prem-developer__visual {
    width: 300px;
    flex-shrink: 0;
}

/* ---------- 最終CTAセクション ---------- */
.prem-final-cta {
    background: var(--p-text);
    color: var(--p-white);
}

/* ボタンと黒→ティール曲線の間に余白を確保
   Why: フッターが margin-top:-3rem (=-48px) でCTA下部に食い込むため、
        セクション標準の bottom padding ではボタン直下から曲線が始まり詰まって見える。
        80px なら 80-48=32px の視覚的な余白がボタン下に残る */
.premium-page .prem-final-cta {
    padding-bottom: 80px;
}

.prem-final-cta .prem-container {
    text-align: center;
}

/* フッター上部の凹み装飾（style.css の radial-gradient）を黒CTAと連続させる
   Why: 通常ページは上が白なので白凹みで自然だが、premium 直前は黒CTAのため
        白凹みが浮いてフッターに食い込んだ見た目になる
   Note: #footer は .premium-page の外側なので CSS 変数は届かない → ハードコード */
body:has(.premium-page) #footer.l-footer {
    background: radial-gradient(110% 30% at top, #333333 50%, #8bbabb 51%);
}

.premium-page .prem-final-cta__title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.5;
    margin: 0 0 16px;
    color: var(--p-white);
}

.premium-page .prem-final-cta__lead {
    font-size: 16px;
    line-height: 1.5;
    margin: 0 0 24px;
    color: var(--p-white);
}

/* SWELL/WP デフォルトの<p>カラー上書きを防ぐための優先度強化 */
.premium-page .prem-plan-card--paid .prem-plan-card__name,
.premium-page .prem-plan-card--paid .prem-plan-card__price-num,
.premium-page .prem-plan-card--paid .prem-plan-card__price-unit,
.premium-page .prem-plan-card--paid .prem-plan-card__price-note,
.premium-page .prem-plan-card--paid .prem-plan-card__feature-value {
    color: var(--p-white);
}

.premium-page .prem-faq-q {
    color: var(--p-white);
}

.premium-page .prem-role-badge--student {
    color: var(--p-white);
}

.premium-page .prem-btn--primary {
    color: var(--p-white);
}

/* ============================================================
   レスポンシブ対応（〜768px）
   ============================================================ */
@media (max-width: 768px) {
    .premium-page > section {
        padding: 24px 0 40px;
    }

    /* #2: SP時はヒーロー上部paddingを0にする（ヘッダ直下から表示） */
    .premium-page > section.prem-hero {
        padding-top: 0;
    }

    .prem-section-title {
        font-size: 20px;
    }

    .prem-section-tag {
        font-size: 14px;
    }

    /* ヒーロー：Figma SP順「タグ→タイトル→リード→イラスト→ボタン」 */
    .prem-hero__inner {
        flex-direction: column;
        align-items: stretch;
        gap: 24px;
    }

    .prem-hero__copy {
        display: contents;
    }

    /* prem-hero__copy が display:contents なので prem-tag は flex 直下扱い。
       親の align-items: stretch でタグが全幅に伸びてしまうため、
       align-self で文字幅にフィットさせる */
    .prem-tag { order: 1; align-self: flex-start; }
    .prem-hero__title { order: 2; font-size: 28px; margin: 0; }
    .prem-hero__lead { order: 3; margin: 0; }
    .prem-hero__visual { order: 4; }
    .prem-cta-group { order: 5; }

    /* #3a: SP時の画像をやや小さく */
    .prem-hero__visual img {
        width: 90%;
    }

    /* 課題 */
    .prem-problem-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .prem-problem-card {
        font-size: 16px;
    }

    .prem-callout {
        font-size: 16px;
        padding: 20px 24px;
    }

    /* 4つの特長 */
    .prem-feature-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .prem-feature-card {
        padding: 24px;
    }

    .prem-feature-num {
        font-size: 24px;
        top: 13px;
        left: 35px;
    }

    .prem-feature-title {
        font-size: 16px;
    }

    .prem-feature-desc {
        font-size: 14px;
    }

    /* SPはFigma準拠で折り返し・左寄せ（特長カード内） */
    .prem-tag-list {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    /* 使い方下の3タグは中央寄せのまま */
    .prem-tag-list--center {
        justify-content: center;
    }

    /* 使い方 */
    .prem-step {
        flex-direction: column;
        align-items: stretch;
        padding: 20px 24px;
        gap: 20px;
    }

    .prem-step__head {
        width: auto;
        gap: 11px;
    }

    .prem-step__num {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .prem-step__title {
        font-size: 16px;
    }

    .prem-step__body {
        flex-direction: row;
        align-items: flex-start;
        gap: 16px;
    }

    .prem-step__body p {
        font-size: 14px;
    }

    /* 料金プラン */
    /* #4c: SP時はカード間に余白を確保 */
    .prem-plan-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .prem-plan-card__name {
        font-size: 24px;
    }

    .prem-plan-card__price-num {
        font-size: 32px;
    }

    .prem-plan-card__price-unit,
    .prem-plan-card__price-note {
        font-size: 16px;
    }

    /* #4b: SP時のfeatures行間は文字サイズと揃える */
    .prem-plan-card__features {
        gap: 14px;
    }

    .prem-plan-card__features li {
        font-size: 14px;
    }

    /* FAQ */
    .prem-faq-item {
        padding: 20px 24px;
    }

    .prem-faq-question,
    .prem-faq-answer {
        font-size: 14px;
    }

    /* 開発者の想い */
    .prem-developer__inner {
        flex-direction: column;
        gap: 32px;
    }

    .prem-developer__copy {
        text-align: center;
    }

    .prem-developer__title {
        font-size: 20px;
    }

    .prem-developer__visual {
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }

    /* 最終CTA
       Note: `.premium-page` プレフィックスは specificity を 766行目のデスクトップ rule
       (.premium-page .prem-final-cta__title) と揃えるため必須。
       揃えないと desktop rule (0,2,0) が常に勝ち、モバイルで font-size が効かない */
    .premium-page .prem-final-cta__title {
        font-size: 22px;
    }

    /* #3b: SP時のCTAボタン縦並び・間隔を広めに */
    .prem-cta-group {
        flex-direction: column;
        padding: 0 20px;
        gap: 24px;
    }

    .prem-cta-group .prem-btn {
        width: 100%;
    }
}

/* ============================================================
   タブレット対応（769〜1024px）
   #7: タブレット時にカードが右端に詰まる問題への対応
   #8: タブレット時の料金プラン間が広すぎる問題への対応
   ============================================================ */
@media (min-width: 769px) and (max-width: 1024px) {
    /* #7: コンテナの左右paddingを広げて、カードと画面端の余白を確保 */
    .prem-container {
        padding-left: 32px;
        padding-right: 32px;
    }

    /* #8: 料金プラン同士のgapを左右マージンと揃える */
    .prem-plan-grid {
        gap: 32px;
    }
}