@charset "UTF-8";

/* ================================
   共通スタイル
================================ */
html {
    font-size: 100%;
}

body {
    margin: 0;
    padding: 70px 0 0 0;
    line-height: 1.7;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    color: #432;
    width: 100%;
    height: 100vh;
    text-align: center;
}

main {
    padding: 0 5px;
    min-height: calc(100vh - (70px + 150px + 270px)); /* ヘッダー + 見出し + フッター */
}

a {
    text-decoration: none;
}

img {
    max-width: 100%;
}

.title {
    font-size: 28px;
    margin: 50px auto;
}

/* ================================
   レスポンシブ用ユーティリティ
================================ */
/* スマホのみ表示 */
.sp {
    display: none;
}

@media (max-width: 768px) {
    .sp {
        display: block;
    }
}

/* ================================
   レイアウト
================================ */
.wrapper {
    max-width: 1120px;
    margin: auto;
    padding: 0 1.5rem;
}

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

p {
    text-align: justify;
}

/* ================================
   カラー
================================ */
.bg-white-section {
    background-color: #ffffff;
    padding: 50px 0;
}

.bg-gray-section {
    background-color: rgba(0, 144, 170, 0.03);
    padding: 50px 0;
}

/* ================================
   ヘッダー
================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    z-index: 1000;
}

/* ロゴ */
.logo {
    height: 48px;
    display: flex;
    align-items: center;
}

.logo img {
    height: 48px;
}

.logo a {
    line-height: 0;
}

/* ナビゲーション */
.nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin: 0 15px;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    opacity: 0.6;
}

/* ハンバーガーメニュー（モバイル用） */
.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger div {
    width: 25px;
    height: 3px;
    background-color: #333;
    margin: 5px 0;
    transition: 0.4s;
}

/* フリートライアルボタン */
.free-trial-btn {
    background-color: #00bbdd;
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    margin-left: 20px;
    font-weight: 600;
    text-decoration: none;
    transition: background-color 0.3s;
}

.free-trial-btn:hover {
    background-color: #0090aa;
}

/* モバイル用フリートライアルボタン */
.mobile-trial-btn {
    display: none; /* デフォルトでは非表示 */
}

.mobile-free-trial-btn {
    background-color: #00bbdd;
    color: white !important;
    padding: 15px 30px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(11, 221, 221, 0.3);
    transition: all 0.3s;
    margin-top: 30px;
    display: inline-block;
}

.mobile-free-trial-btn:hover {
    background-color: #0090aa;
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(11, 221, 221, 0.4);
}

.mobile-free-trial-btn::after {
    display: none;
}

/* モバイルナビゲーション */
@media screen and (max-width: 1024px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100vh;
        background: linear-gradient(135deg, #f9f9f9 0%, #ffffff 100%);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        transition: all 0.5s cubic-bezier(0.77, 0, 0.175, 1);
        padding: 60px 0;
        box-shadow: -5px 0 25px rgba(0, 0, 0, 0.1);
    }
    
    /* オーバーレイ背景 */
    .nav::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.5s ease;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links.active + .hamburger + .nav::before {
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        margin: 15px 0;
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.4s ease;
        transition-delay: calc(0.1s * var(--i, 0));
    }
    
    .nav-links.active li {
        opacity: 1;
        transform: translateY(0);
    }
    
    .nav-links li:nth-child(1) { --i: 1; }
    .nav-links li:nth-child(2) { --i: 2; }
    .nav-links li:nth-child(3) { --i: 3; }
    .nav-links li:nth-child(4) { --i: 4; }
    .nav-links li:nth-child(5) { --i: 5; }
    
    .nav-links a {
        font-size: 1.2rem;
        display: block;
        padding: 10px 20px;
        text-align: center;
        border-radius: 8px;
        transition: all 0.3s;
    }
    
    .nav-links a:hover {
        background-color: rgba(0, 102, 255, 0.1);
        transform: scale(1.05);
    }
    
    .mobile-trial-btn {
        display: block;
        margin-top: 20px;
        opacity: 0;
        transform: scale(0.8);
        transition: opacity 0.3s, transform 0.3s;
        transition-delay: 0.6s;
    }
    
    .nav-links.active .mobile-trial-btn {
        opacity: 1;
        transform: scale(1);
    }
    
    .mobile-trial-btn a:hover {
        background-color: #0090aa;
    }

    .hamburger {
        display: block;
    }
    
    .hamburger.active div:nth-child(1) {
        transform: rotate(-45deg) translate(-8px, 4px);
    }
    
    .hamburger.active div:nth-child(2) {
        opacity: 0;
        transform: translateX(15px);
    }
    
    .hamburger.active div:nth-child(3) {
        transform: rotate(45deg) translate(-8px, -4px);
    }
    
    .free-trial-btn {
        display: none;
    }
}

/* ================================
   フッター
================================ */
footer {
    background-color: #111827;
    padding: 2rem 0;
    border-top: 1px solid #e9ecef;
}

.footer-nav {
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
}

.footer-links li {
    margin-right: 1.5rem;
    margin-bottom: 0.5rem;
}

.footer-links li:last-child {
    margin-right: 0;
}

.footer-links a {
    color: #e9ecef;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #007bff;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    text-align: center;
    margin-top: 1rem;
}

.footer-logo {
    width: 300px;
    margin-bottom: 20px;
}

.footer-logo:hover {
    opacity: 0.6;
}

.copyright {
    color: #e9ecef;
    font-size: 0.85rem;
}

.copyright a {
    color: #e9ecef;
    text-decoration: none;
    transition: color 0.2s;
}

.copyright a:hover {
    color: #007bff;
}

@media (max-width: 768px) {
    .footer-links {
        flex-direction: column;
    }

    .footer-links li {
        margin-right: 0;
        margin-bottom: 0.75rem;
    }
}

/* ================================
   トップページ
================================ */
/* ファーストビュー */
.page-title {
    font-family: "游ゴシック体", "Yu Gothic", YuGothic, sans-serif;
    font-size: 3rem;
    text-align: center;
    margin-top: 2rem;
    line-height: 1.4;
}

.page-text {
    font-weight: bold;
    font-family: serif;
    font-size: 2rem;
    text-align: center;
    margin-top: 1rem;
    line-height: 1.4;
}

.heading-large {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .page-text {
        margin-top: 0;
        padding-top: 50px;
        font-size: 1.3rem;
    }
    
    .heading-large {
        font-size: 1.6rem;
    }
}

#manga-viewer:hover {
    opacity: 0.6;
}

/* カバー設定 */
.cover {
    background-size: cover;
    background-position: center bottom;
    height: 800px;
}

.cover-home {
    background-image: url(../images/waterdrop_and_paperplane.webp);
}

/* テキストコンテナ */
.text-container {
    max-width: 736px;
    padding: 0 1.5rem;
    margin: 4rem auto;
}

.text-container p {
    margin-top: 2rem;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    .text-container p {
        font-size: 1rem;
    }
}

/* ================================
   ボタン
================================ */
/* 共通ボタン */
.common-btn {
    background-color: #00bbdd;
    color: white;
    padding: 15px 25px;
    border-radius: 9999px;
    font-weight: 500;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    transition: all 0.3s;
    transition-duration: .4s;
    min-width: 200px;
}

.common-btn:hover {
    background-color: #0090aa;
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px) scale(1.1);
}

.back-btn {
    background-color: #FFFFFF;
    border: #00bbdd 1px solid;
    color: #00bbdd;
    padding: 15px 25px;
    border-radius: 9999px;
    font-weight: 500;
    align-items: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-decoration: none;
    transition: all 0.3s;
    transition-duration: .4s;
    min-width: 200px;
}

.back-btn:hover {
    opacity: 0.6;
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px) scale(1.1);
}

/* ================================
   グリッドレイアウト
================================ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 32px;
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .container {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ================================
   カードスタイル
================================ */
.card {
    background-color: white;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    border: 1px solid #f3f4f6;
    transition: all 0.3s ease;
    height: 320px;
    position: relative;
    overflow: hidden;
    perspective: 1000px;
}

.card:hover {
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    border-color: #e0f2fe;
    transform: translateY(-5px);
}

.default,
.content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 30px;
    backface-visibility: hidden;
    transition: transform 0.6s ease-in-out;
}

.default {
    transform: rotateY(0deg);
    display: flex;
    flex-direction: column;
    z-index: 2;
    background-color: white;
}

.content {
    transform: rotateY(180deg);
    background-color: #0090aa;
    color: white;
    z-index: 1;
}

.card:hover .default {
    transform: rotateY(-180deg);
}

.card:hover .content {
    transform: rotateY(0deg);
}

.card h3 {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 16px;
    text-align: left;
}

.content h3 {
    color: white;
}

.card p {
    font-size: 16px;
    line-height: 1.6;
}

.content p {
    color: white;
}

/* カードの番号表示 */
.default::before {
    content: attr(data-number);
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    background-color: #ecfeff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: bold;
    color: #0090AA;
}

/* ================================
   料金プラン
================================ */
.pricing-grid {
    max-width: 896px;
    margin: 0 auto;
    display: grid;
    grid-gap: 32px;
}

@media (min-width: 768px) {
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.pricing-card {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
    position: relative;
}

.pricing-card:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.recommended {
    position: relative;
}

.recommended-badge {
    position: absolute;
    top: 28px;
    right: -48px;
    background-color: #FBBF24;
    padding: 4px 48px;
    transform: rotate(45deg);
    font-size: 14px;
    font-weight: 600;
    z-index: 10;
}

.pricing-header {
    padding: 24px;
    color: white;
}

.monthly,
.annual {
    background-color: #0090aa;
}

.pricing-title {
    text-align: center;
    font-size: 24px;
    font-weight: bold;
}

.pricing-subtitle {
    margin-top: 8px;
    text-align: center;
    font-size: 14px;
}

.pricing-content {
    background-color: white;
    padding: 24px;
}

.pricing-price {
    margin-bottom: 24px;
    text-align: center;
}

.original-price {
    margin-bottom: 4px;
    font-size: 14px;
    color: #6B7280;
    text-decoration: line-through;
    height: 1.2em;
}

.price {
    font-size: 30px;
    font-weight: bold;
}

.yen {
    font-weight: bold;
}

.period {
    color: #6B7280;
}

.monthly-equivalent {
    margin-top: 4px;
    font-size: 14px;
    color: #EF4444;
    height: 1.2em;
}

.visibility-hidden {
    visibility: hidden;
}

.pricing-features {
    margin-bottom: 24px;
    list-style: none;
}

.feature-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.check-icon-img {
    width: 20px;
    height: 20px;
    margin-right: 8px;
}

/* ================================
   FAQ（よくある質問）
================================ */
.faq-section {
    padding-bottom: 150px;
}

.faq-icon {
    color: #0090aa;
    font-weight: bold;
    font-size: 30px;
    padding-right: 20px;
}

.faq-answer {
    color: #0090aa;
    text-align: left;
    font-size: 1.1rem;
}

.faq-answer-detail {
    font-size: 1rem;
    opacity: 0.85;
}

.faq-container {
    max-width: 896px;
    margin: 0 auto;
}

.accordion-item {
    background-color: white;
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s;
    margin-bottom: 24px;
    border: 1px solid #F3F4F6;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.accordion-item:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.accordion-item.active {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.accordion-button {
    width: 100%;
    padding: 24px 32px;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    -webkit-tap-highlight-color: transparent;
}

.accordion-button:focus {
    outline: none;
}

.accordion-title {
    font-weight: normal;
    font-size: 1.1rem;
    transition: color 0.3s;
    color: #432;
}

@media (max-width: 768px) {
    .accordion-title {
        font-size: 1rem;
    }
    
    .faq-answer {
        font-size: 1rem;
    }
    
    .faq-answer-detail {
        font-size: 0.9rem;
    }
}

.accordion-icon {
    width: 32px;
    height: 32px;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: #ecfeff;
    transition: all 0.3s;
}

.accordion-icon img {
    width: 16px;
    height: 16px;
    transition: all 0.3s;
    fill: #6B7280;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-item.active .accordion-icon img {
    transform: rotate(90deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s ease-in-out;
    opacity: 0;
}

.accordion-item.active .accordion-content {
    max-height: 500px;
    opacity: 1;
}

.accordion-body {
    padding: 16px 32px 24px;
    border-top: 1px solid #F3F4F6;
}

/* ================================
   テーブルスタイル
================================ */
/* 特定商取引法表記用テーブル */
.legal_table {
    max-width: 700px;
    margin: 50px auto;
    font-family: "メイリオ", "Meiryo UI", sans-serif;
}

.legal_table th,
.legal_table td {
    padding: 1rem;
    border-right: 1px solid #fff;
    vertical-align: middle;
}

.legal_table th:last-child,
.legal_table td:last-child {
    border-right: 0;
}

.legal_table tbody tr {
    border-bottom: 1px solid #FFFFFF;
    background-color: #f1f3f8;
}

.legal_table tbody tr:last-child {
    border: none;
}

.legal_table tbody .label {
    font-weight: bold;
    width: 30%;
}

.legal_table tbody .description {
    width: 70%;
    text-align: left;
}


/* ================================
   プライバシーポリシー
================================ */
.privacy-policy {
    line-height: 1.6;
    max-width: 900px;
    margin: 0 auto 50px auto;
    padding: 20px;
    text-align: left;
}

.privacy-policy h3 {
    font-size: 24px;
    padding-bottom: 10px;
    margin-top: 40px;
}

.privacy-policy .indent-1 {
    padding-left: 20px;
}

.privacy-policy .section {
    margin-bottom: 30px;
}

.privacy-policy p {
    margin: 10px 0;
}

.privacy-policy ul {
    list-style-type: disc;
    padding-left: 20px;
}

/* ================================
   利用規約
================================ */
.agreement {
    line-height: 1.6;
    max-width: 900px;
    margin: 0 auto 50px auto;
    padding: 20px;
    text-align: left;
}

.agreement h3 {
    font-size: 24px;
    padding: 20px 0 10px 0;
}

.agreement table {
    width: 100%;
    border-collapse: collapse;
}

.agreement .term-number {
    width: 30px;
    vertical-align: top;
    text-align: right;
    padding-right: 10px;
    white-space: nowrap;
}

.agreement .term-content {
    vertical-align: top;
    padding-bottom: 8px;
}

.agreement .sub-table {
    margin-top: 10px;
    width: 100%;
}

.agreement .parenthesis-number {
    width: 40px;
    vertical-align: top;
    text-align: right;
    padding-right: 10px;
    white-space: nowrap;
}

.agreement p {
    margin: 10px 0;
}

/* ================================
   お知らせページ
================================ */
.notice-form {
    margin-bottom: 80px;
    padding: 0 1.5rem;
    margin: 3rem auto 4rem;
    color: #432;
}

/* お知らせ一覧リスト */
.notice-list {
    list-style: none outside;
    margin: 0;
    padding: 0;
}

.notice-list .item {
    background: #fff;
    color: black;
    padding: 0px;
}

.notice-list .item a {
    display: flex;
    flex-wrap: wrap;
    flex-wrap: nowrap;
    text-decoration: none;
    color: #333;
    border-bottom: 1px solid #CCC;
    padding: 20px 20px;
}

.notice-list .item:first-child a {
    border-top: 1px solid #CCC;
}

.notice-list .item .date {
    margin: 0;
    min-width: 140px;
    font-size: 16px;
    color: #999;
    padding: 0 20px 0 0;
}

.notice-list .item .category {
    margin: 0;
    min-width: 140px;
    padding: 0 20px 0 0;
}

.notice-list .item .category span {
    text-align: center;
    display: inline-block;
    padding: 7px 10px;
    font-size: 12px;
    line-height: 1;
    border-radius: 6px;
}

.notice-list .item .title {
    margin: 0;
    width: 100%;
    font-size: 100%
}

.notice-list .item a:hover .title {
    color: #00F;
}

@media screen and (max-width: 767px) {
    .notice-list .item a {
        flex-wrap: wrap;
    }
    
    .notice-list .item .date {
        min-width: 100px;
    }
    
    .notice-list .item .title {
        margin-top: 10px;
    }
}

.notice-date {
    flex: 0 0 100px;
    color: var(--muted-color);
}

.notice-category-container {
    flex: 0 0 150px;
    text-align: center;
}

.notice-title-container {
    flex: 1;
}

/* タイトルリンク */
.notice-title {
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
}

.notice-title:hover {
    text-decoration: underline;
}

/* ページネーション */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.pagination button {
    color: white;
    background-color: #3498db;
    border: none;
    padding: 8px 16px;
    margin: 0 5px;
    cursor: pointer;
    border-radius: 4px;
}

.pagination button:disabled {
    background-color: rgb(170, 168, 168);
    cursor: not-allowed;
}

.pagination button:not(:disabled):hover {
    opacity: 0.6;
}

.pagination span {
    padding: 8px 16px;
}

/* お知らせ詳細 */
.notice-detail {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.notice-detail h2 {
    color: #2c3e50;
    margin-top: 10px;
    margin-bottom: 10px;
}

.notice-category span {
    text-align: center;
    display: inline-block;
    padding: 7px 10px;
    font-size: 14px;
    line-height: 1;
    border-radius: 6px;
}

.notice-info {
    line-height: 1.8;
    text-align: left;
    margin-bottom: 20px;
    display: block;
}

.notice-info p {
    margin-top: 8px;
    margin-bottom: 8px;
    font-size: 18px;
    text-align: left;
    display: inline-block;
}

.notice-info b {
    margin-top: 12px;
    margin-bottom: 12px;
    font-size: 20px;
    text-align: left;
    display: inline-block;
}

.notice-info ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.notice-info li {
    margin-bottom: 0.5rem;
}

.notice-info li:last-child {
    margin-bottom: 0;
}

.notice-info table {
    border-collapse: collapse;
    width: 100%;
    margin-top: 20px;
    margin-bottom: 20px;
}

.notice-info tr {
    border-bottom: 1px solid gray;
}

.notice-info th {
    width: 150px;
    font-size: 18px;
    padding: 10px 16px;
    font-weight: bold;
    text-align: left;
}

.notice-info td {
    font-size: 18px;
    padding: 10px 16px;
    text-align: left;
}

.notice-meta {
    display: flex;
    justify-content: space-between;
    color: #7f8c8d;
    margin-bottom: 15px;
}

/* カテゴリースタイル */
.category-notice {
    background-color: #3498db;
    color: white;
}

.category-maintenance {
    background-color: #f39c12;
    color: white;
}

.category-important {
    background-color: #e74c3c;
    color: white;
}

.back-button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    margin-top: 20px;
    cursor: pointer;
    border-radius: 4px;
}

/* ================================
   ユーティリティクラス
================================ */
.loading {
    text-align: center;
    padding: 50px;
    font-size: 18px;
    color: #7f8c8d;
}

.error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.btn-margin {
    margin-left: 20px;
}

/* ================================
   ボタンコンテナ
================================ */
.button-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.button-container .back-btn,
.button-container .common-btn {
    margin: 0;
}

/* ================================
   レスポンシブ対応
================================ */
@media screen and (max-width: 767px) { 
    .button-container {
        flex-direction: column-reverse;
        align-items: stretch;
        gap: 15px;
    }
    
    .back-btn,
    .common-btn {
        width: 100%;
        text-align: center;
    }
}

@media (min-width: 800px) {
    .page-title {
        font-size: 5rem;
    }

    .heading-large {
        font-size: 3rem;
    }

    .main-nav {
        font-size: 2rem;
    }

    .page-header {
        display: flex;
        justify-content: space-between;
        padding-top: 1.5rem;
    }
}