/*
Theme Name: Kameyama Music Thema
Theme URI: https://example.com/kameyama-music-thema
Author: Your Name
Author URI: https://example.com
Description: かめやま音楽教室のWordPressテーマ
Version: 1.0.1
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: kameyama-music-thema
*/

/* CSS変数の定義 */
:root {
  --color-main: #FFF8EE;      /* メインカラー（アクセント用） */
  --color-base: #FFFFFF;      /* ページベース（白） */
  --color-sub: #535353;       /* サブテキスト */
  --color-sub-21: rgba(83, 83, 83, 0.21);  /* サブテキスト21% */
  --color-back: #FAFAFA;      /* 背景色 */
  --color-white: #FFFFFF;     /* 白 */
  --color-black: #000000;     /* 黒 */

  --header-height: 7vh;
}

/* ベーススタイル */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--color-black);
  background-color: var(--color-base);
  margin: 0;
  padding: 0;
}

/* 狭い1カラムを中央に（固定幅ではなく最大幅） */
body.home #page.site {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  background-color: var(--color-base);
}

/* コンテナ */
.container {
  max-width: 420px; /* 最大幅420px */
  margin: 0 auto;
  padding: 0 20px;
}

/* メインコンテンツ */
.site-main {
  background-color: var(--color-base);
  min-height: 100vh;
}

/* レスポンシブ */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}

/* ナビゲーション */
.site-header {
  background-color: var(--color-main);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0.5rem 0.8rem;
  height: calc(var(--header-height) - 1rem);
}

.header-right {
  flex: 0 0 auto;
  height: 100%;
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  aspect-ratio: 1 / 1;
}

.header-center {
  flex: 1;
  text-align: left;
  padding: 0 1rem;
}

.header-left {
  flex: 0 0 auto;
  height: 100%;
}

.site-title {
  margin: 0;
  font-size: 1.2rem;
  color: var(--color-black);
}

/* ボタンスタイル */
.menu-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: background-color 0.3s ease;
}

/* メニュー表示中、ヘッダーより下のコンテンツを暗くする */
.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: 500;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.mobile-menu-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* モバイルメニュー（ヘッダー直下から下へ開く） */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  width: 100vw;
  height: auto;
  max-height: none;
  background-color: var(--color-white);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  transform: translateY(-5%);
  z-index: 200;
  overflow: visible;
  opacity: 0;
  pointer-events: none;
  transition:
    transform 0.5s ease,
    opacity 0.2s ease;
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.menu-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.mobile-menu.active .menu-overlay {
  opacity: 1;
}

.menu-content {
  position: relative;
  z-index: 1;
  padding: 1.25rem 1.5rem 1.5rem;
  background-color: var(--color-white);
}

.menu-content ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
}

.menu-content li {
  border-radius: 6px;
  text-decoration: none;
  text-align: center;
  line-height: 2.5rem;
  background-color: var(--color-main);
  border: 2px solid transparent;
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.menu-content a {
  color: var(--color-black);
  text-decoration: none;
  font-size: 1.05rem;
  display: block;
  transition: color 0.3s ease;
}

.menu-content li:hover {
  background-color: var(--color-white);
  border-color: var(--color-black);
}

.menu-content li:hover a {
  color: var(--color-black);
}

.menu-actions {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  background-color: var(--color-white);
  text-align: center;
}

.btn-primary {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.3s ease;
  text-align: center;
  color: var(--color-white);
  border: 2px solid transparent;
  background-color: var(--color-black);
}

.btn-primary:hover {
  background-color: #333;
}

.menu-actions .btn-primary {
  color: var(--color-white);
}

.menu-actions .btn-primary:hover {
  background-color: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-black)
}

/* ヒーローセクション */
.hero {
  background-color: var(--color-base);
  padding: calc(var(--header-height) + 2rem) 0 6rem 0;
}

.hero-card {
  background-color: var(--color-main);
  padding: 3rem 2rem;
  border-radius: 8px;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  margin: 0 0 1rem 0;
  color: var(--color-black);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--color-black);
  margin-bottom: 2rem;
  opacity: 0.8;
}

.btn-hero {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 1rem 2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  transition: background-color 0.3s ease;
  margin-bottom: 2rem;
}

.btn-hero:hover {
  background-color: #333;
}

/* ナビゲーションボタン */
.navigation-buttons {
  padding: 2rem 0;
  background-color: var(--color-base);
}

.nav-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  justify-items: center;
}

.nav-btn {
  color: var(--color-black);
  padding: 1rem;
  border-radius: 999px;
  text-decoration: none;
  text-align: center;
  transition: all 0.3s ease;
  width: 70%;
  border: 1px solid var(--color-black);
  background-color: var(--color-white);
}

.nav-btn:hover {
  background-color: var(--color-back);
}

/* 教室紹介 */
.intro {
  background-color: var(--color-base);
}

.intro-card {
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  padding: 0;
  overflow: visible;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
  background-color: var(--color-white);
}

.intro-card__inner {
  padding: 1.35rem 1.25rem 1.75rem;
  border: 10px solid var(--color-main);
  background-color: var(--color-white);
}

.intro-photo {
  position: relative;
  width: 100%;
  margin: 0;
  border-radius: 0;
  overflow: hidden;
  background-color: var(--color-back);
}

.intro-photo__img {
  width: 100%;
  height: auto;
  vertical-align: top;
  object-fit: contain;
  object-position: center top;
  display: block;
}

/* 教室風景：写真左上に重ねる */
.intro-scenery-caption {
  position: absolute;
  top: 0.55rem;
  left: 0.55rem;
  z-index: 2;
  margin: 0;
  padding: 0.32em 0.55em;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--color-sub);
  background-color: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 2px;
}

.image-placeholder {
  background-color: var(--color-sub-21);
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-sub);
  border-radius: 8px;
  font-size: 0.9rem;
}

/* セクション区切り（教室写真と本文のあいだ） */
.music-note-divider.section-divider {
  margin: 0;
  padding: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: var(--color-white);
  overflow: hidden;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.music-note-divider__img {
  display: block;
  width: 70%;
  height: 50px;
  object-fit: none;
  object-position: center -88px;
}

.music-note-divider {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 2.25rem;
  margin: 1.35rem 0 1.5rem;
}

.music-note-divider__line {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background-color: rgba(83, 83, 83, 0.4);
  transform: translateY(-50%);
}

.music-note-divider__notes {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0 0.85rem;
  background-color: var(--color-white);
}

.intro-card .music-note-divider__notes {
  background-color: var(--color-white);
}

.note {
  font-size: 1.45rem;
  line-height: 1;
  color: var(--color-sub);
  opacity: 0.75;
  font-family: Georgia, "Times New Roman", "Hiragino Mincho ProN", serif;
}

/* 見出し上の筆記体装飾（完成イメージに合わせたトーン） */
.section-accent {
  font-family: Georgia, "Times New Roman", "Hiragino Mincho ProN", serif;
  font-size: 1.05rem;
  font-style: italic;
  line-height: 1;
  text-align: center;
  margin: 0 0 0.35rem;
  color: #6a6a6a;
  font-weight: 400;
  letter-spacing: 0.12em;
}

.section-head {
  text-align: center;
  margin-bottom: 2rem;
}

.section-head .section-title {
  margin-top: 0;
  margin-bottom: 0;
}

/* ごあいさつ */
.intro-greeting {
  position: relative;
  margin-top: 0.25rem;
  padding-bottom: 0.25rem;
}

.intro-greeting .section-accent {
  text-align: center;
}

.intro-greeting__title {
  margin: 0 0 0.75rem;
  text-align: center;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--color-black);
}

.intro-greeting__body {
  text-align: left;
  padding: 0;
}

.intro-greeting__body p:not(.intro-greeting__sign-off) {
  margin: 0 0 0.95em;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--color-sub);
  text-align: left;
}

.intro-greeting__sign-off {
  margin: 1.15rem 0 0;
  text-align: right;
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-black);
}

/* 講師紹介 */
.teacher {
  background-color: var(--color-base);
}

.section-title {
  font-size: 1.65rem;
  text-align: center;
  margin-bottom: 2rem;
  color: var(--color-black);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.teacher-image {
  margin-bottom: 2rem;
}

.teacher-bio-card {
  background-color: var(--color-white);
  border-radius: 12px;
  padding: 1.5rem 1.35rem;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-left: 3px solid rgba(200, 170, 130, 0.5);
}

.teacher-bio-card p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-sub);
  text-align: left;
}

.teacher-bio-card p:last-child {
  margin-bottom: 0;
}

.teacher-bio-card strong {
  color: var(--color-black);
  font-weight: 600;
}

/* 講師写真：中央画像の背後にベージュ板をずらして重ねる */
.teacher-visual {
  position: relative;
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  padding: 18px 22px 22px 18px;
}

.teacher-visual__accent {
  position: absolute;
  z-index: 0;
  width: 58%;
  height: 78%;
  background-color: var(--color-main);
  border-radius: 4px;
  opacity: 0.95;
}

.teacher-visual__accent--tl {
  top: 0;
  left: 0;
  transform: translate(-8px, -10px);
}

.teacher-visual__accent--br {
  bottom: 0;
  right: 0;
  transform: translate(8px, 10px);
}

.teacher-photo {
  position: relative;
  z-index: 1;
  width: 100%;
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 3 / 4;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.07);
}

.teacher-photo__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}


/* クラス紹介 */
.classes {
  background-color: var(--color-base);
}

.classes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.class-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background-color: var(--color-white);
  border-radius: 12px;
  padding: 1.5rem 1.4rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.07);
  border-left: 4px solid rgba(200, 170, 130, 0.6);
  text-align: left;
}

.class-card__top {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.class-card__icon {
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--color-main);
  border: 1px solid rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
  font-size: 1.2rem;
  color: var(--color-sub);
}

.class-card__titles {
  flex: 1;
  min-width: 0;
}

.class-card__titles h3 {
  font-size: 1.2rem;
  margin: 0 0 0.3rem;
  color: var(--color-black);
  font-weight: 600;
  line-height: 1.35;
}

.class-card__lead {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-sub);
  line-height: 1.55;
}

.class-card__sub {
  margin: 0.3rem 0 0;
  font-size: 0.85rem;
  color: var(--color-sub);
  line-height: 1.45;
  opacity: 0.92;
}

.class-card__details {
  padding: 1rem 0.4rem 0;
  margin: 0;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.class-card__details p {
  margin: 0.65rem 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-sub);
}

.class-card__details p:first-child {
  margin-top: 0;
}

.class-card__details p:last-child {
  margin-bottom: 0;
}

.class-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.class-age {
  color: var(--color-sub);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.class-link {
  align-self: flex-end;
  margin-left: auto;
  margin-top: 0.25rem;
  color: var(--color-sub);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-sub-21);
  padding-bottom: 0.15rem;
  text-align: right;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.class-link:hover {
  color: var(--color-black);
  border-bottom-color: var(--color-sub);
}

/* 連絡先 */
.contact {
  background-color: var(--color-base);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.contact-card {
  background-color: var(--color-white);
  border-radius: 12px;
  padding: 1.75rem 1.5rem;
  box-shadow: none;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-left: 3px solid rgba(200, 170, 130, 0.5);
  text-align: center;
}

.contact-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 0.85rem;
  border-radius: 8px;
  background-color: var(--color-main);
  border: 1px solid rgba(0, 0, 0, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  line-height: 1;
  color: var(--color-sub);
}

.contact-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--color-sub);
}

.contact-info {
  color: var(--color-sub);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.contact-time {
  color: var(--color-sub);
  font-size: 0.9rem;
  opacity: 0.8;
}

/* お問い合わせフォーム */
/* お問い合わせフォーム */
.form-section {
  background-color: var(--color-base);
}

.form-card {
  background-color: var(--color-white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: none;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-left: 3px solid rgba(200, 170, 130, 0.5);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-sub);
  font-weight: 500;
  font-size: 0.9rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--color-sub-21);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--color-back);
  transition: border-color 0.3s ease;
  box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: rgba(0, 0, 0, 0.28);
}

.btn-submit {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 1rem 2rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.3s ease;
  width: 100%;
}

.btn-submit:hover {
  background-color: #333;
}

/* フローティングボタン */
.floating-buttons {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1000;
}

.floating-container {
  position: relative;
}

/* メイングループ：トグルボタン位置を起点に配置 */
.floating-group-main {
  position: absolute;
  /* トグルボタン（sub中央）の位置に合わせる */
  bottom: 58px;
  right: 0;
  width: 48px;
  height: 48px;
  pointer-events: none;
}

.floating-group-main .floating-btn {
  position: absolute;
  top: 0;
  left: 0;
  transform: scale(0);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.floating-buttons.is-open .floating-group-main {
  pointer-events: auto;
}

/* トグルから左上に枝分かれして展開 */
.floating-buttons.is-open .floating-group-main .floating-btn:nth-child(1) {
  transform: translate(-62px, -136px) scale(1);
  opacity: 1;
  transition-delay: 0.1s;
}

.floating-buttons.is-open .floating-group-main .floating-btn:nth-child(2) {
  transform: translate(-62px, -78px) scale(1);
  opacity: 1;
  transition-delay: 0.05s;
}

.floating-buttons.is-open .floating-group-main .floating-btn:nth-child(3) {
  transform: translate(-62px, -20px) scale(1);
  opacity: 1;
}

.floating-group-sub {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.floating-btn {
  width: 48px;
  height: 48px;
  background-color: var(--color-main);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--color-sub);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  z-index: 1;
  cursor: pointer;
}

.floating-btn:hover {
  background-color: var(--color-white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
}

/* フッター */
.site-footer {
  background-color: var(--color-back);
  border-top: 1px solid var(--color-sub-21);
  padding: 2rem 0;
  text-align: center;
}

.site-info {
  color: var(--color-sub);
  font-size: 0.9rem;
}

.site-info a {
  color: var(--color-sub);
  text-decoration: none;
}

/* セクションスタイル */
section {
  padding: 3rem 0;
}

section h2 {
  font-size: 1.65rem;
  margin-bottom: 0;
  text-align: center;
  color: var(--color-black);
}

.section-head + .teacher-image,
.section-head + .classes-grid,
.section-head + .contact-grid,
.section-head + .form-card {
  margin-top: 0;
}

/* Aboutセクション */
.about {
  background-color: var(--color-back);
  border-top: 1px solid var(--color-sub-21);
  border-bottom: 1px solid var(--color-sub-21);
}

/* Serviceセクション */
.service {
  background-color: var(--color-white);
}

/* Contactセクション（上で .contact を定義済み） */

/* フッター */
.site-footer {
  background-color: var(--color-back);
  border-top: 1px solid var(--color-sub-21);
  padding: 2rem 0;
  text-align: center;
}

.site-info {
  color: var(--color-sub);
  font-size: 0.9rem;
}

.site-info a {
  color: var(--color-sub);
  text-decoration: none;
}

/* タブレット版 (769px〜1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-content p {
    font-size: 1.1rem;
  }
  
  section h2 {
    font-size: 1.75rem;
  }
  
  /* ナビゲーション */
  .main-navigation {
    display: flex;
  }
  
  .main-navigation ul {
    display: flex;
  }
  
  .main-navigation li {
    margin-left: 1.5rem;
    margin: 0;
  }
  
  /* ヒーローセクション */
  .hero-visual {
    margin-top: 3rem;
  }
  
  .visual-placeholder {
    height: 250px;
  }
  
  /* Serviceセクション */
  .service-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
  
  .service-card {
    padding: 1.5rem;
  }
  
  .service-icon {
    font-size: 2.5rem;
  }
  
  /* Contactセクション */
  .contact-content {
    grid-template-columns: 1fr 1fr;
  }
  
  .contact-form {
    padding: 1.5rem;
  }
}

/* PC版 (1025px〜) */
@media (min-width: 1025px) {
  .hero-content h1 {
    font-size: 3.5rem;
  }
  
  .hero-content p {
    font-size: 1.3rem;
  }
  
  section h2 {
    font-size: 2.5rem;
  }
  
  /* ナビゲーション */
  .main-navigation li {
    margin-left: 3rem;
  }
  
  .main-navigation a:hover {
    color: var(--color-main);
    transform: translateY(-2px);
  }
  
  /* ヒーローセクション */
  .hero-visual {
    margin-top: 4rem;
  }
  
  .visual-placeholder {
    height: 300px;
  }
  
  /* Serviceセクション */
  .service-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 4rem;
  }
  
  .service-card {
    padding: 2.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
  }
  
  .service-icon {
    font-size: 4rem;
  }
  
  /* Contactセクション */
  .contact-content {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
  
  .contact-form {
    padding: 3rem;
  }
  
  .btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
}

/* レスポンシブ */
@media (max-width: 768px) {
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
  
  section h2 {
    font-size: 1.5rem;
  }
  
  .main-navigation {
    display: block;
  }
  
  .main-navigation ul {
    flex-direction: column;
    display: none;
  }
  
  .main-navigation.active ul {
    display: flex;
  }
  
  .main-navigation li {
    margin: 1rem 0;
    margin-left: 0;
  }
  
  /* ヒーローセクション */
  .hero-visual {
    margin-top: 2rem;
  }
  
  .visual-placeholder {
    background-color: var(--color-sub-21);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-sub);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
  }
  
  .visual-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%), 
                linear-gradient(-45deg, rgba(255,255,255,0.1) 25%, transparent 25%), 
                linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.1) 75%), 
                linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.1) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    animation: shimmer 2s infinite;
  }
  
  @keyframes shimmer {
    0% { background-position: -200px 0, -200px 10px, -190px -10px, -210px 0px; }
    100% { background-position: 200px 0, 200px 10px, 210px -10px, 190px 0px; }
  }
  
  /* Aboutセクション */
  .about-content {
    text-align: center;
  }
  
  .decoration-line {
    width: 100px;
    height: 2px;
    background-color: var(--color-sub-21);
    margin: 2rem auto;
  }
  
  /* Serviceセクション */
  .service-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .service-card {
    background-color: var(--color-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
  }
  
  .service-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
  }
  
  .service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-sub);
  }
  
  /* Contactセクション */
  .contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .contact-info h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-sub);
  }
  
  .contact-details p {
    margin-bottom: 1rem;
    color: var(--color-sub);
  }
  
  .contact-form {
    background-color: var(--color-white);
    padding: 2rem;
    border-radius: 12px;
  }
  
  .form-group {
    margin-bottom: 1.5rem;
  }
  
  .form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--color-sub);
    font-weight: 500;
  }
  
  .form-group input,
  .form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--color-sub-21);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--color-back);
  }
  
  .btn-submit {
    background-color: var(--color-black);
    color: var(--color-white);
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 100%;
  }

  .btn-submit:hover {
    background-color: #333;
  }
}