/* ==========================================================================
   イリエ音楽教室 - スタイルシート
   ========================================================================== */

/* --- デザインシステム & 変数定義 --- */
:root {
    /* カラーパレット */
    --color-primary: #ff9d00;      /* 温かみのあるオレンジ */
    --color-primary-light: #fff5e6; /* オレンジの超薄地 */
    --color-secondary: #4caf50;    /* やさしいグリーン */
    --color-secondary-light: #e8f5e9;
    
    /* 音感テーマカラー */
    --color-abs-pitch: #ff5252;    /* 絶対音感のイメージ（暖色・赤系） */
    --color-abs-light: #ffebee;
    --color-rel-pitch: #2196f3;    /* 相対音感のイメージ（寒色・青系） */
    --color-rel-light: #e3f2fd;

    /* ベースカラー */
    --color-bg: #fffbf5;           /* 暖かみのある生成り色の背景 */
    --color-bg-white: #ffffff;
    --color-text-main: #3e3327;    /* 黒すぎないダークブラウン */
    --color-text-muted: #7d6e5d;   /* 補足用ブラウン */
    --color-border: #f0e6d6;
    
    /* フォントファミリー */
    --font-jp: 'Zen Maru Gothic', sans-serif;
    --font-en: 'Outfit', sans-serif;

    /* シャドウ効果 */
    --shadow-sm: 0 4px 6px rgba(125, 110, 93, 0.05);
    --shadow-md: 0 8px 16px rgba(125, 110, 93, 0.1);
    --shadow-lg: 0 16px 32px rgba(125, 110, 93, 0.15);
    
    /* 角丸 */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    /* トランジション */
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* --- リセット CSS --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    font-family: var(--font-jp);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}

ul {
    list-style: none;
}

button, input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    outline: none;
}

/* --- 共通レイアウトコンポーネント --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* セクションタイトル */
.section-title-area {
    text-align: center;
    margin-bottom: 60px;
}

.section-sub {
    font-family: var(--font-en);
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--color-primary);
    letter-spacing: 2px;
    display: block;
    margin-bottom: 8px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--color-text-main);
    position: relative;
    display: inline-block;
    padding-bottom: 12px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
}

.section-intro {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-top: 16px;
}

/* グラデーションテキスト */
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary), #ff5252);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 900;
}

/* --- ヘッダー --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 251, 245, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.site-header.scrolled {
    padding: 8px 0;
    box-shadow: var(--shadow-sm);
    background-color: rgba(255, 251, 245, 0.95);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--color-text-main);
}

.logo-icon {
    font-size: 1.8rem;
    animation: float 3s ease-in-out infinite;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-weight: 700;
    color: var(--color-text-main);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-btn {
    background: linear-gradient(135deg, var(--color-primary), #ff8000);
    color: #fff;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(255, 157, 0, 0.2);
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 157, 0, 0.3);
}

/* ハンバーガーメニュー */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle span {
    width: 100%;
    height: 3px;
    background-color: var(--color-text-main);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

/* モバイルメニュー */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    height: 100vh;
    background-color: var(--color-bg);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: right 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.mobile-menu.open {
    right: 0;
}

.mobile-nav ul {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

.mobile-nav-link {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--color-text-main);
}

.mobile-nav-btn {
    background: linear-gradient(135deg, var(--color-primary), #ff8000);
    color: #fff;
    padding: 16px 36px;
    border-radius: var(--radius-full);
    font-size: 1.4rem;
    font-weight: 900;
    box-shadow: 0 4px 15px rgba(255, 157, 0, 0.3);
}

/* --- ヒーローセクション --- */
.hero-section {
    padding: 160px 0 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 60px;
}

.hero-tag {
    display: inline-block;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 157, 0, 0.2);
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 900;
    line-height: 1.35;
    margin-bottom: 24px;
}

.hero-title .highlight-yellow {
    color: var(--color-primary);
    position: relative;
    display: inline-block;
}

.hero-title .highlight-blue {
    color: var(--color-rel-pitch);
    position: relative;
    display: inline-block;
}

.hero-title .multiply {
    font-family: var(--font-en);
    font-weight: 400;
    margin: 0 8px;
    color: var(--color-text-muted);
}

.hero-title .main-phrase {
    font-size: 2.3rem;
    display: block;
    margin-top: 10px;
}

.hero-lead {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.cta-primary-btn {
    background: linear-gradient(135deg, var(--color-secondary), #388e3c);
    color: #fff;
    padding: 18px 36px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.25);
    display: inline-block;
}

.cta-primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 25px rgba(76, 175, 80, 0.35);
}

.cta-secondary-btn {
    background-color: var(--color-bg-white);
    color: var(--color-text-main);
    padding: 18px 36px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1.1rem;
    border: 2px solid var(--color-border);
    display: inline-block;
}

.cta-secondary-btn:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ヒーロー画像装飾 */
.hero-image-wrapper {
    position: relative;
    z-index: 1;
}

.hero-image {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 8px solid #fff;
    transform: rotate(2deg);
    transition: var(--transition);
}

.hero-image:hover {
    transform: rotate(0deg) scale(1.02);
}

/* 装飾グラフィックス */
.image-decoration {
    position: absolute;
    z-index: -1;
}

.deco-circle-1 {
    width: 120px;
    height: 120px;
    background-color: #ffe082;
    border-radius: 50%;
    top: -30px;
    left: -30px;
    opacity: 0.6;
}

.deco-circle-2 {
    width: 200px;
    height: 200px;
    background-color: #a5d6a7;
    border-radius: 50%;
    bottom: -50px;
    right: -40px;
    opacity: 0.4;
}

.deco-note-1 {
    font-size: 3rem;
    top: 20%;
    left: -50px;
    transform: rotate(-15deg);
    animation: float 4s ease-in-out infinite;
}

.deco-note-2 {
    font-size: 2.5rem;
    bottom: 20%;
    right: -50px;
    transform: rotate(15deg);
    animation: float-delayed 5s ease-in-out infinite;
}

/* --- コンセプト / 音感セクション --- */
.concept-section {
    padding: 100px 0;
    background-color: var(--color-bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.feature-card {
    padding: 50px 40px;
    border-radius: var(--radius-lg);
    position: relative;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-6px);
}

.abs-pitch-card {
    background-color: var(--color-abs-light);
}

.abs-pitch-card:hover {
    border-color: var(--color-abs-pitch);
    box-shadow: 0 16px 30px rgba(255, 82, 82, 0.1);
}

.rel-pitch-card {
    background-color: var(--color-rel-light);
}

.rel-pitch-card:hover {
    border-color: var(--color-rel-pitch);
    box-shadow: 0 16px 30px rgba(33, 150, 243, 0.1);
}

.card-badge {
    position: absolute;
    top: -16px;
    left: 40px;
    color: #fff;
    padding: 6px 18px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 700;
}

.badge-red {
    background-color: var(--color-abs-pitch);
    box-shadow: 0 4px 10px rgba(255, 82, 82, 0.3);
}

.badge-blue {
    background-color: var(--color-rel-pitch);
    box-shadow: 0 4px 10px rgba(33, 150, 243, 0.3);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.6rem;
    font-weight: 900;
    margin-bottom: 12px;
}

.pitch-definition {
    font-size: 1.15rem;
    font-weight: 700;
    border-bottom: 2px dashed rgba(62, 51, 39, 0.15);
    padding-bottom: 16px;
    margin-bottom: 24px;
}

.abs-pitch-card .pitch-definition {
    color: #d32f2f;
}

.rel-pitch-card .pitch-definition {
    color: #1976d2;
}

.feature-details li {
    margin-bottom: 16px;
    padding-left: 24px;
    position: relative;
}

.feature-details li::before {
    content: '♪';
    position: absolute;
    left: 0;
    color: var(--color-text-muted);
    font-weight: bold;
}

.feature-details li strong {
    color: var(--color-text-main);
}

/* 警告ボックス */
.warning-box {
    background: linear-gradient(135deg, #fff9c4, #fff59d);
    border-left: 6px solid #fbc02d;
    padding: 30px 40px;
    border-radius: var(--radius-md);
    display: flex;
    gap: 24px;
    align-items: flex-start;
    margin-bottom: 80px;
    box-shadow: var(--shadow-sm);
}

.warning-icon {
    font-size: 2.2rem;
    line-height: 1;
}

.warning-content h4 {
    font-size: 1.3rem;
    font-weight: 900;
    color: #f57f17;
    margin-bottom: 8px;
}

.warning-content p {
    font-size: 1rem;
    line-height: 1.7;
}

/* 一貫したステップ */
.steps-area {
    text-align: center;
    background-color: var(--color-bg);
    padding: 60px 40px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
}

.steps-area h3 {
    font-size: 1.8rem;
    font-weight: 900;
    margin-bottom: 40px;
    color: var(--color-text-main);
}

.steps-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    max-width: 800px;
    margin: 0 auto 30px auto;
}

.step-item {
    background-color: var(--color-bg-white);
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    flex: 1;
    text-align: left;
    border-top: 5px solid var(--color-secondary);
}

.step-item:first-child {
    border-top-color: var(--color-primary);
}

.step-num {
    font-family: var(--font-en);
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.step-item h4 {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.step-arrow {
    font-size: 2rem;
    color: var(--color-primary);
    animation: pulse 2s infinite;
}

.steps-goal {
    font-size: 1.15rem;
    color: var(--color-text-muted);
}

/* --- レッスンと教材セクション --- */
.materials-section {
    padding: 100px 0;
}

.materials-grid {
    display: flex;
    flex-direction: column;
    gap: 60px;
    margin-bottom: 80px;
}

.material-card {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    min-height: 400px;
}

.material-img-fallback {
    background-color: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 8rem;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.icon-card {
    background: linear-gradient(135deg, #ffe0b2, #ffb74d);
}

.icon-doctor {
    background: linear-gradient(135deg, #c8e6c9, #81c784);
}

.material-content {
    padding: 50px;
}

.material-tag {
    display: inline-block;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    font-weight: 700;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.material-content h3 {
    font-size: 1.8rem;
    font-weight: 900;
    margin-bottom: 16px;
}

.material-content > p {
    color: var(--color-text-muted);
    margin-bottom: 30px;
}

/* 比較ボックス */
.comparison-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.comp-item {
    padding: 20px;
    border-radius: var(--radius-md);
}

.comp-item.common {
    background-color: #f5f5f5;
    border-top: 4px solid #9e9e9e;
}

.comp-item.irie {
    background-color: var(--color-primary-light);
    border-top: 4px solid var(--color-primary);
}

.comp-item h5 {
    font-size: 1rem;
    font-weight: 900;
    margin-bottom: 8px;
}

.comp-item.common h5 {
    color: #616161;
}

.comp-item.irie h5 {
    color: var(--color-primary);
}

.comp-item p {
    font-size: 0.9rem;
    line-height: 1.6;
}

.note-pill {
    background-color: #e8f5e9;
    color: #2e7d32;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 700;
}

/* 子どもの要求3か条 & 親御さん安心 */
.kids-policy {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 60px 40px;
    border: 2px solid var(--color-border);
}

.policy-header {
    text-align: center;
    margin-bottom: 45px;
}

.policy-header h3 {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.policy-header p {
    color: var(--color-text-muted);
}

.policy-cards {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 30px;
    margin-bottom: 50px;
}

.policy-card {
    background-color: var(--color-bg);
    padding: 30px 24px;
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.policy-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-sm);
}

.policy-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.policy-card h4 {
    font-size: 1.25rem;
    font-weight: 900;
    margin-bottom: 12px;
}

.policy-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

.parent-support {
    background-color: var(--color-primary-light);
    border-radius: var(--radius-md);
    padding: 40px;
    border-left: 6px solid var(--color-primary);
}

.support-content h4 {
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.support-content p {
    line-height: 1.7;
    margin-bottom: 16px;
}

.support-extra {
    font-weight: 700;
    color: var(--color-text-main);
    border-top: 1px dashed rgba(62, 51, 39, 0.2);
    padding-top: 16px;
    margin-bottom: 0 !important;
}

/* --- コースと料金セクション --- */
.pricing-section {
    padding: 100px 0;
    background-color: var(--color-bg-white);
}

.pricing-container {
    max-width: 900px;
    margin: 0 auto;
}

.entry-fee {
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 30px;
    text-align: center;
    margin-bottom: 40px;
    box-shadow: var(--shadow-sm);
}

.entry-fee h4 {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

.price-val {
    margin-bottom: 12px;
}

.price-val .currency {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 700;
    vertical-align: super;
}

.price-val .num {
    font-family: var(--font-en);
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-text-main);
}

.price-val .tax {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.entry-fee .price-desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.plans-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.plan-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    border: 2px solid var(--color-border);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: var(--transition);
}

.plan-card:hover {
    transform: translateY(-5px);
}

.primary-plan {
    border-color: var(--color-secondary);
    background-color: var(--color-secondary-light);
}

.option-plan {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.plan-header {
    margin-bottom: 24px;
}

.plan-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.primary-plan .plan-tag {
    background-color: var(--color-secondary);
}

.option-plan .plan-tag {
    background-color: var(--color-primary);
}

.plan-header h3 {
    font-size: 1.6rem;
    font-weight: 900;
}

.plan-price {
    margin-bottom: 30px;
    border-bottom: 2px solid rgba(62, 51, 39, 0.1);
    padding-bottom: 20px;
}

.price-month {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    display: block;
    margin-bottom: 4px;
}

.price-amount {
    font-family: var(--font-en);
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--color-text-main);
}

.plan-features {
    margin-bottom: 30px;
    flex-grow: 1;
}

.plan-features li {
    margin-bottom: 12px;
    padding-left: 20px;
    position: relative;
    font-size: 0.95rem;
}

.plan-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    font-weight: bold;
}

.primary-plan .plan-features li::before {
    color: var(--color-secondary);
}

.option-plan .plan-features li::before {
    color: var(--color-primary);
}

.plan-info {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    background-color: rgba(255, 255, 255, 0.6);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    text-align: center;
}

/* --- ブログセクション --- */
.blog-section {
    padding: 100px 0;
}

.blog-card-wrapper {
    background: linear-gradient(135deg, var(--color-primary), #ff7b00);
    border-radius: var(--radius-lg);
    padding: 60px 80px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 60px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.blog-card-wrapper::after {
    content: '🎵';
    position: absolute;
    font-size: 15rem;
    opacity: 0.08;
    right: -40px;
    bottom: -60px;
    pointer-events: none;
}

.blog-image-deco {
    font-size: 8rem;
    line-height: 1;
    animation: float 4s ease-in-out infinite;
}

.blog-info {
    flex-grow: 1;
}

.blog-tag {
    font-family: var(--font-en);
    font-weight: 800;
    font-size: 0.85rem;
    letter-spacing: 1px;
    background-color: rgba(255, 255, 255, 0.2);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    display: inline-block;
    margin-bottom: 16px;
}

.blog-info h2 {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 16px;
}

.blog-info p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 30px;
    opacity: 0.9;
}

.blog-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background-color: var(--color-bg-white);
    color: var(--color-primary);
    padding: 16px 36px;
    border-radius: var(--radius-full);
    font-weight: 900;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.blog-link-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    background-color: var(--color-primary-light);
}

.blog-link-btn .arrow-icon {
    font-family: var(--font-jp);
    transition: transform 0.3s ease;
}

.blog-link-btn:hover .arrow-icon {
    transform: translateX(5px);
}

/* --- お問い合わせセクション --- */
.contact-section {
    padding: 100px 0;
    background-color: var(--color-bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 60px;
}

.contact-info-panel {
    padding-top: 20px;
}

.contact-tag {
    font-family: var(--font-en);
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--color-secondary);
    letter-spacing: 2px;
    display: block;
    margin-bottom: 8px;
}

.contact-info-panel h2 {
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 24px;
}

.contact-info-panel > p {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.contact-points {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.point-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.point-icon {
    font-size: 2rem;
    line-height: 1;
}

.point-item h5 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.point-item p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* フォームパネル */
.contact-form-panel {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: 50px 40px;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.required {
    background-color: #ff5252;
    color: #fff;
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    margin-left: 6px;
    vertical-align: middle;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-border);
    background-color: var(--color-bg-white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(255, 157, 0, 0.1);
}

.form-group.has-error input,
.form-group.has-error textarea {
    border-color: #ff5252;
}

.error-msg {
    color: #ff5252;
    font-size: 0.85rem;
    font-weight: 700;
    margin-top: 6px;
    display: none;
}

.form-group.has-error .error-msg {
    display: block;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 500 !important;
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
}

.submit-btn {
    width: 100%;
    background: linear-gradient(135deg, var(--color-secondary), #388e3c);
    color: #fff;
    border: none;
    padding: 16px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
}

.submit-btn:disabled {
    background: #ccc;
    box-shadow: none;
    cursor: not-allowed;
}

/* スピナー */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    display: none;
}

.spinner.show {
    display: block;
}

/* 送信完了画面 */
.success-message {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
    z-index: 10;
    transform: translateY(100%);
    transition: transform 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.success-message.show {
    transform: translateY(0);
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    animation: pop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.success-message h3 {
    font-size: 1.6rem;
    font-weight: 900;
    margin-bottom: 12px;
    color: var(--color-secondary);
}

.success-message p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 30px;
}

.close-success-btn {
    background-color: var(--color-bg-white);
    color: var(--color-text-main);
    border: 2px solid var(--color-border);
    padding: 10px 30px;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 700;
    transition: var(--transition);
}

.close-success-btn:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* --- フッター --- */
.site-footer {
    background-color: var(--color-text-main);
    color: #fff;
    padding: 40px 0;
    text-align: center;
    border-top: 4px solid var(--color-primary);
}

.footer-bottom {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* --- アニメーションの定義 --- */
@keyframes float {
    0% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-10px) rotate(3deg); }
    100% { transform: translateY(0) rotate(0); }
}

@keyframes float-delayed {
    0% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-8px) rotate(-3deg); }
    100% { transform: translateY(0) rotate(0); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes pop {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* --- レスポンシブ対応 (メディアクエリ) --- */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.3rem;
    }
    .hero-title .main-phrase {
        font-size: 1.9rem;
    }
    .material-card {
        grid-template-columns: 1fr;
    }
    .material-img-fallback {
        min-height: 250px;
        font-size: 6rem;
    }
}

@media (max-width: 768px) {
    /* ナビゲーションの切り替え */
    .main-nav {
        display: none;
    }
    .menu-toggle {
        display: flex;
    }
    
    /* ハンバーガーアニメーション用クラス (JSで付与) */
    .menu-toggle.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }

    /* ヒーローセクション */
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    .hero-title {
        font-size: 2rem;
    }
    .hero-title .main-phrase {
        font-size: 1.7rem;
    }
    .hero-actions {
        justify-content: center;
        flex-direction: column;
        width: 100%;
    }
    .hero-actions a {
        width: 100%;
        text-align: center;
    }
    .hero-image-wrapper {
        max-width: 500px;
        margin: 0 auto;
    }

    /* 音感特徴グリッド */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .feature-card {
        padding: 40px 24px;
    }

    /* 一貫したステップ */
    .steps-flow {
        flex-direction: column;
        gap: 20px;
    }
    .step-arrow {
        transform: rotate(90deg);
        margin: 10px 0;
        animation: none;
    }

    /* 教材セクション */
    .material-content {
        padding: 30px 20px;
    }
    .comparison-box {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    /* 子どもの要求3か条 */
    .policy-cards {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .policy-card {
        padding: 24px 16px;
    }
    .kids-policy {
        padding: 40px 20px;
    }

    /* コースと料金 */
    .plans-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .plan-card {
        padding: 40px 24px;
    }

    /* ブログ */
    .blog-card-wrapper {
        flex-direction: column;
        padding: 40px 24px;
        gap: 30px;
        text-align: center;
    }
    .blog-image-deco {
        font-size: 5rem;
    }
    
    /* お問い合わせ */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .contact-form-panel {
        padding: 40px 20px;
    }
}

/* --- 電話番号リンク & 地図スタイル --- */
.tel-link {
    color: var(--color-primary);
    font-weight: 700;
    border-bottom: 1px dashed var(--color-primary);
}

.tel-link:hover {
    color: #ff7b00;
    border-bottom-style: solid;
}

.contact-map-wrapper {
    margin-top: 40px;
    background-color: var(--color-bg);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
}

.contact-map-wrapper h5 {
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--color-text-main);
}

.contact-map-img {
    width: 100%;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    border: 4px solid #fff;
    margin-bottom: 12px;
    transition: var(--transition);
}

.contact-map-img:hover {
    transform: scale(1.02);
}

.map-link-google {
    text-align: right;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-primary);
}

.map-link-google a {
    display: inline-block;
    transition: var(--transition);
}

.map-link-google a:hover {
    color: #ff7b00;
    transform: translateX(3px);
}

/* --- ブログ最新記事 (RSS) スタイル --- */
.blog-layout {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: stretch;
}

.blog-posts-container {
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.blog-posts-container h3 {
    font-size: 1.4rem;
    font-weight: 900;
    margin-bottom: 24px;
    color: var(--color-text-main);
    border-left: 5px solid var(--color-primary);
    padding-left: 12px;
    line-height: 1.2;
}

.blog-posts-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    flex-grow: 1;
}

.blog-post-item {
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--color-border);
    transition: var(--transition);
}

.blog-post-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.blog-post-item:hover {
    transform: translateX(4px);
}

.blog-post-date {
    font-family: var(--font-en);
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: 6px;
    display: block;
}

.blog-post-title {
    font-size: 1.1rem;
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 8px;
}

.blog-post-title a {
    color: var(--color-text-main);
    transition: var(--transition);
}

.blog-post-title a:hover {
    color: var(--color-primary);
}

.blog-post-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.blog-posts-loading, .blog-posts-error {
    text-align: center;
    color: var(--color-text-muted);
    padding: 40px 0;
    font-size: 0.95rem;
}

.blog-posts-error {
    color: var(--color-abs-pitch);
}

@media (max-width: 900px) {
    .blog-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}