/* ===================================
   リセット & ベース設定
   テーマ：黒いスレート × ブロンズ金属 × 額縁
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット */
    --slate-950: #121219;
    --slate-900: #17171f;
    --slate-850: #1c1c26;
    --slate-800: #22222e;
    --slate-700: #2c2c3a;
    --bronze-dark: #6e4a31;
    --bronze: #b98761;
    --bronze-light: #e3bf98;
    --champagne: #f1d9b8;
    --gold: #d8b25a;
    --cream: #f3ece2;
    --text: #e6ddd1;
    --text-muted: #b3a797;
    --line: rgba(201, 152, 106, 0.35);
    --line-strong: rgba(214, 170, 120, 0.7);
    --burgundy: #b0526a;
    --soft-green: #8fbf9a;

    /* 旧変数名（互換用） */
    --navy-blue: var(--slate-900);
    --dark-navy: var(--slate-950);
    --white: #ffffff;
    --light-grey: rgba(255, 255, 255, 0.12);
    --dark-grey: var(--text);

    /* 金属・背景グラデーション */
    --metal-bronze: linear-gradient(100deg,
        #5a3b28 0%, #9a6b48 14%, #d6a57b 28%, #b88560 40%,
        #7f563b 55%, #c49470 70%, #e2b58c 80%, #8a5d40 100%);
    --metal-bronze-soft: linear-gradient(135deg, #a67551 0%, #d9ac82 45%, #9c6c4a 100%);
    --metal-gold: linear-gradient(135deg, #b8893a 0%, #f0d48a 45%, #c79a45 100%);
    --brushed: repeating-linear-gradient(90deg,
        rgba(255, 255, 255, 0.05) 0 1px, rgba(0, 0, 0, 0.04) 1px 3px, transparent 3px 5px);
    --text-bronze: linear-gradient(180deg, #fbe3c3 0%, #e1b487 45%, #b27b50 100%);
    --gradient-gold: var(--metal-bronze-soft);

    /* スレートの質感（SVGノイズ） */
    --slate-texture: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .07 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");

    /* タイポグラフィ */
    --font-display: 'Shippori Mincho B1', 'Noto Serif JP', serif;
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Noto Sans JP', sans-serif;

    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* シャドウ */
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.6);
    --bevel: inset 0 1px 0 rgba(255, 255, 255, 0.12), inset 0 -1px 0 rgba(0, 0, 0, 0.4);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    background: var(--slate-900);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 各セクション共通のスレート背景 */
.features,
.stats-bar,
.instructor,
.video-section,
.lessons,
.testimonials,
.ensemble,
.faq-section,
.access,
.footer {
    background-color: var(--slate-900);
    background-image: var(--slate-texture);
    position: relative;
}

/* セクション間の細いブロンズライン */
.instructor::before,
.video-section::before,
.lessons::before,
.testimonials::before,
.ensemble::before,
.faq-section::before,
.access::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(1100px, 90%);
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

/* 交互に少し明るいスレート */
.instructor,
.lessons,
.ensemble,
.access {
    background-color: var(--slate-850);
}

/* ===================================
   告知バー
   =================================== */
.announcement-bar {
    background: var(--brushed), var(--metal-bronze);
    color: #2a1a10;
    text-align: center;
    padding: 9px var(--spacing-md);
    font-size: 0.92rem;
    font-weight: 500;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1001;
    text-shadow: 0 1px 0 rgba(255, 230, 200, 0.35);
}

.announcement-bar p {
    margin: 0;
}

.announcement-close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: #2a1a10;
    padding: 2px 6px;
    border-radius: 4px;
    flex-shrink: 0;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.announcement-close:hover {
    opacity: 1;
}

/* ===================================
   ナビゲーション
   =================================== */
.navbar {
    background: linear-gradient(180deg, #1f1f2a 0%, #181820 100%);
    /* 告知バーの下に置き、スクロールしたら上端に貼り付く */
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
    transition: all var(--transition-medium);
}

/* ナビ下端のブロンズライン */
.navbar::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, #7a5236 12%, #e0b58a 50%, #7a5236 88%, transparent 100%);
}

.navbar.scrolled {
    background: rgba(22, 22, 30, 0.97);
    backdrop-filter: blur(10px);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.9rem var(--spacing-md);
    gap: var(--spacing-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.nav-logo {
    font-size: 1.7rem;
    filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.5));
}

/* クラシックギターのアイコン（絵文字🎸の代わりに使う自作SVG） */
.gtr {
    width: 1em;
    height: 1em;
    vertical-align: -0.16em;
    display: inline-block;
    flex-shrink: 0;
}

.nav-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    white-space: nowrap;
    letter-spacing: 0.04em;
    background: var(--text-bronze);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
    align-items: center;
}

.nav-link {
    color: var(--cream);
    text-decoration: none;
    padding: 0.45rem 0.85rem;
    border-radius: 6px;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    font-family: var(--font-serif);
    font-weight: 500;
    font-size: 0.97rem;
    white-space: nowrap;
    letter-spacing: 0.04em;
}

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

.nav-link.active {
    color: var(--champagne);
    border-color: var(--line-strong);
    background: linear-gradient(180deg, rgba(185, 135, 97, 0.28), rgba(110, 74, 49, 0.28));
    box-shadow: var(--bevel), 0 2px 8px rgba(0, 0, 0, 0.4);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 26px;
    height: 2px;
    background: var(--bronze-light);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ===================================
   ヒーローセクション
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    background-color: var(--slate-900);
    background-image:
        var(--slate-texture),
        radial-gradient(ellipse at 70% 40%, rgba(80, 70, 100, 0.25), transparent 60%),
        linear-gradient(160deg, #22222f 0%, #17171f 55%, #121219 100%);
    display: flex;
    align-items: center;
    padding: 70px 0 90px;
    overflow: hidden;
}

/* スレート板の継ぎ目のような斜めのライン */
.hero-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, transparent 0 58%, rgba(255, 255, 255, 0.035) 58% 58.15%, transparent 58.15%),
        linear-gradient(45deg, transparent 0 72%, rgba(0, 0, 0, 0.25) 72% 72.2%, transparent 72.2%),
        linear-gradient(135deg, transparent 0 22%, rgba(255, 255, 255, 0.03) 22% 22.1%, transparent 22.1%);
    pointer-events: none;
}

/* 背景右側の弦・フレット模様 */
.hero-strings {
    position: absolute;
    right: -2%;
    top: -25%;
    width: 560px;
    height: 150%;
    transform: rotate(40deg);
    transform-origin: center;
    opacity: 0.6;
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--spacing-lg);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInLeft 1s ease;
}

/* ブロンズのプレート（左端まで伸びる金属の帯） */
.hero-plate {
    position: relative;
    isolation: isolate;
    padding: 2.4rem 1rem 2.2rem 0;
    margin-bottom: 2.2rem;
}

.hero-plate::before {
    content: '';
    position: absolute;
    z-index: -1;
    top: 0;
    bottom: 0;
    left: -50vw;
    right: -4rem;
    background: var(--brushed), var(--metal-bronze);
    clip-path: polygon(0 18%, 26vw 18%, calc(26vw + 110px) 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
    box-shadow: var(--shadow-xl);
    filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.55));
    border-radius: 0 16px 0 0;
}

/* 帯の上に重ねる暗めのグラデーション（文字の読みやすさ用） */
.hero-plate::after {
    content: '';
    position: absolute;
    z-index: -1;
    top: 0;
    bottom: 0;
    left: -50vw;
    right: -4rem;
    background:
        linear-gradient(180deg, rgba(255, 235, 210, 0.18) 0%, transparent 25%, transparent 70%, rgba(0, 0, 0, 0.25) 100%),
        linear-gradient(90deg, transparent 50%, rgba(30, 18, 10, 0.35) 100%);
    clip-path: polygon(0 18%, 26vw 18%, calc(26vw + 110px) 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
    border-top: 1px solid rgba(255, 230, 200, 0.4);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: linear-gradient(180deg, rgba(40, 26, 18, 0.55), rgba(40, 26, 18, 0.35));
    border: 1px solid rgba(255, 220, 180, 0.55);
    color: var(--champagne);
    padding: 5px 18px;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.2rem;
    letter-spacing: 0.05em;
    box-shadow: var(--bevel);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.4rem, 4.6vw, 4rem);
    margin-bottom: 1.4rem;
    line-height: 1.25;
    font-weight: 800;
    letter-spacing: 0.04em;
    background: linear-gradient(180deg, #fff1dc 0%, #f0c89a 45%, #c98c58 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    filter: drop-shadow(0 3px 2px rgba(40, 20, 8, 0.7));
}

.hero-subtitle {
    font-size: 1.08rem;
    color: #fff8ef;
    line-height: 1.9;
    text-shadow: 0 1px 3px rgba(30, 15, 5, 0.85);
}

.hero-badges {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: 2.4rem;
    flex-wrap: wrap;
}

.hero-badge-item {
    background: linear-gradient(180deg, rgba(60, 55, 70, 0.75), rgba(28, 28, 38, 0.85));
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    padding: 0.85rem 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 140px;
    max-width: 180px;
    box-shadow: var(--bevel), var(--shadow-md);
}

.badge-icon {
    font-size: 1.5rem;
}

.badge-text {
    font-size: 0.85rem;
    color: var(--cream);
    line-height: 1.4;
    font-weight: 500;
}

.hero-cta {
    margin-top: 0;
}

/* 金の額縁に入ったCTAカード */
.cta-card {
    position: relative;
    background: linear-gradient(180deg, #2a2a36 0%, #1a1a23 100%);
    border-radius: 20px;
    padding: 1.6rem 1.9rem 1.8rem;
    max-width: 420px;
    border: 6px solid transparent;
    background-clip: padding-box;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), var(--shadow-xl);
    animation: glow 3s ease-in-out infinite;
}

.cta-card::before {
    content: '';
    position: absolute;
    inset: -6px;
    border-radius: 20px;
    padding: 6px;
    background: linear-gradient(135deg, #8a6528 0%, #f3d992 25%, #b88a3e 50%, #f7e2a6 75%, #9a722f 100%);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.cta-label {
    font-size: 0.9rem;
    color: var(--gold);
    margin-bottom: 2px;
    font-weight: 600;
}

.cta-text {
    font-size: 1.35rem;
    color: #fff;
    margin-bottom: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.cta-sub {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 1.1rem;
}

.btn-hero {
    font-size: 1.05rem;
    padding: 0.95rem var(--spacing-md);
    width: 100%;
}

/* 講師写真の額縁 */
.hero-image {
    position: relative;
    animation: fadeInRight 1s ease;
}

.gilded-frame {
    position: relative;
    padding: 22px;
    background:
        linear-gradient(135deg, #5c3f22 0%, #c89a5c 12%, #7c5630 24%, #e6c088 38%, #8b6236 52%, #d4a970 66%, #6a4726 80%, #b88a52 100%);
    box-shadow:
        inset 0 0 0 2px rgba(255, 230, 180, 0.35),
        inset 0 0 0 7px rgba(60, 38, 18, 0.55),
        inset 0 0 0 9px rgba(240, 205, 150, 0.45),
        0 30px 60px rgba(0, 0, 0, 0.7),
        0 0 0 1px rgba(0, 0, 0, 0.8);
    transform: rotate(0.001deg);
}

.gilded-frame-inner {
    position: relative;
    padding: 10px;
    background: linear-gradient(135deg, #e9d3a8, #c9a46c 50%, #efd9b0);
    box-shadow: inset 0 3px 8px rgba(0, 0, 0, 0.55);
}

.gilded-frame-inner img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    object-position: center 30%;
    filter: sepia(0.75) saturate(0.9) contrast(1.05) brightness(0.97);
    box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.5);
}

.hero-image-badge {
    position: absolute;
    bottom: 26px;
    left: 26px;
    background: var(--metal-gold);
    color: #2a1c08;
    padding: 6px 16px;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    box-shadow: var(--bevel), 0 4px 10px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 240, 200, 0.6);
}

.scroll-indicator {
    position: absolute;
    bottom: 26px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    opacity: 0.7;
    animation: bounce 2s ease infinite;
    z-index: 1;
}

.scroll-arrow {
    width: 14px;
    height: 14px;
    border-right: 2px solid var(--bronze);
    border-bottom: 2px solid var(--bronze);
    transform: rotate(45deg);
}

/* ===================================
   セクション見出し
   =================================== */
.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    letter-spacing: 0.06em;
    background: var(--text-bronze);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

/* 見出し下の装飾（ライン＋ひし形） */
.section-title::after {
    content: '';
    display: block;
    width: 180px;
    height: 12px;
    margin: 1rem auto 0;
    background:
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M6 0L12 6L6 12L0 6Z' fill='%23e3bf98'/%3E%3C/svg%3E") center / 11px 11px no-repeat,
        linear-gradient(90deg, transparent, var(--bronze) 30%, transparent 46%, transparent 54%, var(--bronze) 70%, transparent) center / 100% 1px no-repeat;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1rem;
    margin-top: calc(-1 * var(--spacing-md));
    margin-bottom: var(--spacing-lg);
}

/* 共通のダークパネル（カード類） */
.feature-card,
.instructor-info,
.lesson-simple,
.testimonial-card,
.ensemble-card,
.faq-item,
.info-item,
.contact-form-container,
.login-card {
    background: linear-gradient(180deg, rgba(48, 46, 60, 0.85) 0%, rgba(30, 30, 40, 0.92) 100%);
    border: 1px solid var(--line);
    box-shadow: var(--bevel), var(--shadow-md);
}

/* ===================================
   特徴セクション
   =================================== */
.features {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.feature-card {
    padding: 2.4rem var(--spacing-md);
    border-radius: 14px;
    text-align: center;
    transition: all var(--transition-medium);
    position: relative;
}

/* カード上端のブロンズライン */
.feature-card::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 20%;
    right: 20%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--bronze-light), transparent);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--line-strong);
    box-shadow: var(--bevel), var(--shadow-xl);
}

.feature-icon {
    font-size: 2.2rem;
    width: 76px;
    height: 76px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 30%, #3a3848, #1d1d27);
    border: 2px solid var(--bronze);
    box-shadow: 0 0 0 4px rgba(185, 135, 97, 0.15), var(--shadow-md);
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.45rem;
    color: var(--champagne);
    margin-bottom: 0.7rem;
    letter-spacing: 0.04em;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.85;
    text-align: left;
}

/* ===================================
   実績バー（ブロンズの金属プレート）
   =================================== */
.stats-bar {
    padding: 3rem 0;
    background: var(--brushed), var(--metal-bronze);
    border-top: 1px solid rgba(255, 230, 200, 0.5);
    border-bottom: 1px solid rgba(0, 0, 0, 0.6);
    box-shadow: inset 0 10px 20px rgba(0, 0, 0, 0.2), inset 0 -10px 20px rgba(0, 0, 0, 0.25);
}

.stats-grid {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.stat-item {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 800;
    color: #2b1a0e;
    line-height: 1;
    text-shadow: 0 1px 0 rgba(255, 230, 200, 0.5);
}

.stat-plus {
    font-size: 1.1rem;
    font-weight: 600;
}

.stat-label {
    font-size: 0.85rem;
    color: #2b1a0e;
    font-weight: 600;
    max-width: 140px;
    line-height: 1.4;
}

.stat-divider {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, transparent, rgba(40, 24, 12, 0.5), transparent);
    box-shadow: 1px 0 0 rgba(255, 230, 200, 0.35);
}

/* ===================================
   講師紹介セクション
   =================================== */
.instructor {
    padding: var(--spacing-xl) 0;
    color: var(--text);
}

.instructor-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.instructor-photo-container {
    position: sticky;
    top: 110px;
}

/* 講師写真も額縁風に */
.instructor-photo {
    display: block;
    width: 100%;
    border: 12px solid transparent;
    border-image: linear-gradient(135deg, #5c3f22, #d7ad74 30%, #7c5630 55%, #e6c088 80%, #6a4726) 1;
    box-shadow: var(--shadow-xl);
    filter: saturate(0.9);
}

.instructor-photo-caption {
    text-align: center;
    margin-top: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.instructor-photo-caption p:first-child {
    font-family: var(--font-display);
    color: var(--champagne);
    font-size: 1.15rem;
}

.instructor-info {
    padding: var(--spacing-lg);
    border-radius: 16px;
}

.instructor-name {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.2rem;
    letter-spacing: 0.08em;
    background: var(--text-bronze);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.instructor-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
}

.instructor-bio {
    line-height: 1.95;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.instructor-highlight-box {
    background: linear-gradient(90deg, rgba(185, 135, 97, 0.2), rgba(185, 135, 97, 0.05));
    border-left: 3px solid var(--bronze-light);
    border-radius: 0 10px 10px 0;
    padding: 1.3rem 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--cream);
    font-size: 0.95rem;
    line-height: 1.8;
}

.instructor-highlight-box strong {
    color: var(--champagne);
}

.achievements {
    margin-top: var(--spacing-md);
}

.achievements-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--bronze-light);
    margin: var(--spacing-md) 0 var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--line);
    letter-spacing: 0.08em;
}

.achievement-list {
    list-style: none;
    margin-bottom: var(--spacing-sm);
}

.achievement-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: 0.8rem 1rem;
    margin-bottom: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.035);
    border-radius: 8px;
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
}

.achievement-item:hover {
    background: rgba(255, 255, 255, 0.07);
}

.achievement-item.award {
    border-left-color: var(--gold);
}

.achievement-item.education {
    border-left-color: var(--bronze);
}

.achievement-item.credential {
    border-left-color: var(--burgundy);
}

.achievement-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.achievements-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: calc(-1 * var(--spacing-xs));
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

/* ===================================
   演奏動画セクション
   =================================== */
.video-section {
    padding: var(--spacing-xl) 0;
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 820px;
    margin: 0 auto;
    aspect-ratio: 16 / 9;
    border: 14px solid transparent;
    border-image: linear-gradient(135deg, #5c3f22, #d7ad74 30%, #7c5630 55%, #e6c088 80%, #6a4726) 1;
    box-shadow: var(--shadow-xl);
    background: #000;
}

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

.video-cta {
    text-align: center;
    margin-top: var(--spacing-md);
}

/* ===================================
   レッスン案内セクション
   =================================== */
.lessons {
    padding: var(--spacing-xl) 0;
}

.lesson-simple {
    max-width: 680px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 18px;
    padding: var(--spacing-lg);
    text-align: center;
    border-color: var(--line-strong);
    position: relative;
}

.lesson-simple-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: var(--spacing-sm);
}

.lesson-simple-amount {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 800;
    line-height: 1;
    background: var(--text-bronze);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    filter: drop-shadow(0 2px 2px rgba(0, 0, 0, 0.5));
}

.lesson-simple-unit {
    font-size: 1.05rem;
    color: var(--text-muted);
}

.lesson-simple-lead {
    color: var(--text);
    line-height: 1.9;
    margin-bottom: var(--spacing-md);
}

.lesson-simple-features {
    list-style: none;
    text-align: left;
    max-width: 480px;
    margin: 0 auto var(--spacing-md);
}

.lesson-simple-features li {
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text);
}

.lesson-simple-features li:last-child {
    border-bottom: none;
}

/* 無料体験：ブロンズ金属のバナー */
.trial-lesson {
    background: var(--brushed), var(--metal-bronze);
    padding: var(--spacing-lg);
    border-radius: 18px;
    text-align: center;
    color: #fff8ef;
    margin-top: var(--spacing-lg);
    border: 1px solid rgba(255, 230, 200, 0.5);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.trial-lesson::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(20, 12, 6, 0.1), rgba(20, 12, 6, 0.4));
    pointer-events: none;
}

.trial-lesson > * {
    position: relative;
}

.trial-badge {
    display: inline-block;
    background: linear-gradient(180deg, #2a2a36, #1a1a23);
    color: var(--champagne);
    padding: 5px 18px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    border: 1px solid rgba(255, 220, 180, 0.5);
}

.trial-content h3 {
    font-family: var(--font-display);
    font-size: 2.1rem;
    font-weight: 800;
    color: #fff4e4;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(30, 15, 5, 0.8);
}

.trial-content p {
    margin-bottom: var(--spacing-md);
    font-size: 1.02rem;
    line-height: 1.9;
    text-shadow: 0 1px 3px rgba(30, 15, 5, 0.85);
}

.trial-points {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm) var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    color: #fff4e4;
    font-weight: 600;
    text-shadow: 0 1px 3px rgba(30, 15, 5, 0.85);
}

/* ===================================
   生徒の声セクション
   =================================== */
.testimonials {
    padding: var(--spacing-xl) 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.testimonial-card {
    padding: var(--spacing-md);
    border-radius: 14px;
    transition: all var(--transition-medium);
    position: relative;
}

/* 大きな引用符 */
.testimonial-card::before {
    content: '“';
    position: absolute;
    top: 0.2rem;
    right: 1.2rem;
    font-family: var(--font-display);
    font-size: 5rem;
    line-height: 1;
    color: rgba(185, 135, 97, 0.25);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    border-color: var(--line-strong);
    box-shadow: var(--bevel), var(--shadow-xl);
}

.star-rating {
    color: var(--gold);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 3px;
}

.testimonial-text {
    margin-bottom: var(--spacing-md);
    line-height: 1.9;
    color: var(--text);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--spacing-sm);
}

.author-name {
    font-weight: 600;
    color: var(--champagne);
}

.author-detail {
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* ===================================
   合奏団セクション
   =================================== */
.ensemble {
    padding: var(--spacing-xl) 0;
}

.ensemble-card {
    max-width: 740px;
    margin: 0 auto;
    border-radius: 18px;
    padding: var(--spacing-lg);
    text-align: center;
    border-color: var(--line-strong);
}

.ensemble-badge {
    display: inline-block;
    background: var(--metal-bronze-soft);
    color: #2a1a10;
    padding: 5px 18px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--bevel);
}

.ensemble-card h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--champagne);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.04em;
}

.ensemble-card p {
    color: var(--text);
    line-height: 1.9;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.ensemble-points {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm) var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
    color: var(--bronze-light);
    font-weight: 500;
}

/* ===================================
   よくある質問セクション
   =================================== */
.faq-section {
    padding: var(--spacing-xl) 0;
}

.faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.faq-item {
    border-radius: 12px;
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item.open {
    border-color: var(--line-strong);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 1.3rem 1.6rem;
    text-align: left;
    font-family: var(--font-serif);
    font-size: 1.02rem;
    font-weight: 600;
    color: var(--cream);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
    transition: background var(--transition-fast);
}

.faq-question::before {
    content: 'Q';
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--bronze-light);
    margin-right: 0.3rem;
}

.faq-question span:first-child {
    flex: 1;
}

.faq-question:hover {
    background: rgba(185, 135, 97, 0.08);
}

.faq-icon {
    font-size: 1.3rem;
    color: var(--bronze-light);
    font-weight: 400;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 1.6rem;
}

.faq-item.open .faq-answer {
    max-height: 400px;
    padding: 0 1.6rem 1.4rem;
}

.faq-answer p {
    color: var(--text-muted);
    line-height: 1.9;
    font-size: 0.95rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 1rem;
}

/* ===================================
   アクセスセクション
   =================================== */
.access {
    padding: var(--spacing-xl) 0;
}

.access-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.access-info h3,
.contact-form-container h3 {
    font-family: var(--font-display);
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--champagne);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.04em;
}

.contact-form-container h3 {
    font-size: 1.45rem;
    margin-bottom: var(--spacing-sm);
}

.info-item {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    padding: 1.3rem 1.5rem;
    border-radius: 12px;
}

.info-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
}

.info-title {
    font-weight: 600;
    color: var(--bronze-light);
    margin-bottom: 0.2rem;
}

.info-note {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.contact-form-container {
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: 18px;
    border-color: var(--line-strong);
}

.form-intro {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.4rem;
    color: var(--cream);
    font-weight: 500;
    font-size: 0.95rem;
}

.required {
    color: #e38aa0;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.85rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--cream);
    background: rgba(10, 10, 16, 0.55);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4);
    transition: all var(--transition-fast);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(230, 221, 209, 0.4);
}

.form-group select option {
    background: var(--slate-800);
    color: var(--cream);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--bronze-light);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4), 0 0 0 3px rgba(185, 135, 97, 0.25);
}

/* ===================================
   生徒専用ポータル（現在は未使用）
   =================================== */
.student-portal {
    background: var(--slate-900);
    padding: var(--spacing-xl) 0;
}

.portal-login {
    display: flex;
    justify-content: center;
}

.login-card {
    padding: var(--spacing-lg);
    border-radius: 15px;
    max-width: 500px;
    width: 100%;
}

.login-card h3 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--champagne);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.login-description,
.login-note {
    text-align: center;
    color: var(--text-muted);
}

.login-description {
    margin-bottom: var(--spacing-md);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.login-note {
    font-size: 0.9rem;
}

/* ===================================
   フッター
   =================================== */
.footer {
    background-color: var(--slate-950);
    color: var(--text);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 2px solid transparent;
    border-image: linear-gradient(90deg, transparent, var(--bronze), var(--bronze-light), var(--bronze), transparent) 1;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-section h4 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    color: var(--bronze-light);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.05em;
}

.footer-section p {
    color: var(--text-muted);
    font-size: 0.92rem;
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.35rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.92rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--bronze-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===================================
   ボタン
   =================================== */
.btn {
    display: inline-block;
    padding: 0.9rem var(--spacing-md);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 0.05em;
    transition: all var(--transition-medium);
    cursor: pointer;
    border: none;
    font-family: var(--font-sans);
    font-size: 1rem;
    text-align: center;
}

/* ブロンズ金属のボタン */
.btn-primary,
.btn-gold {
    background: var(--brushed), var(--metal-bronze);
    color: #22140a;
    border: 1px solid rgba(255, 225, 190, 0.55);
    box-shadow: var(--bevel), 0 6px 14px rgba(0, 0, 0, 0.5);
    text-shadow: 0 1px 0 rgba(255, 230, 200, 0.4);
}

.btn-primary:hover,
.btn-gold:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
    box-shadow: var(--bevel), 0 10px 22px rgba(0, 0, 0, 0.55), 0 0 18px rgba(227, 191, 152, 0.25);
}

/* 無料体験バナー上のボタンは暗色で目立たせる */
.trial-lesson .btn-gold {
    background: linear-gradient(180deg, #2c2c38, #17171f);
    color: var(--champagne);
    text-shadow: none;
    border-color: rgba(255, 220, 180, 0.6);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--bronze-light);
    color: var(--bronze-light);
}

.btn-outline:hover {
    background: rgba(185, 135, 97, 0.15);
    color: var(--champagne);
}

.btn-large {
    padding: 1.1rem 2.6rem;
    font-size: 1.08rem;
}

.btn-small {
    padding: 0.55rem 1.2rem;
    font-size: 0.9rem;
}

.btn-submit {
    width: 100%;
    padding: 1rem;
    font-size: 1.08rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: wait;
    transform: none;
}

/* ===================================
   アニメーション
   =================================== */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-8px);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), var(--shadow-xl);
    }
    50% {
        box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), var(--shadow-xl), 0 0 28px rgba(240, 212, 138, 0.28);
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }
}

/* ===================================
   レスポンシブデザイン
   =================================== */
/* ナビゲーションが収まらない幅ではハンバーガーメニューに切り替え */
@media (max-width: 1100px) {
    .nav-menu {
        position: absolute;
        top: 100%;
        left: -100%;
        flex-direction: column;
        background: rgba(22, 22, 30, 0.98);
        width: 100%;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
        align-items: stretch;
        transition: left var(--transition-medium);
        max-height: calc(100vh - 66px);
        overflow-y: auto;
        border-bottom: 1px solid var(--line);
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }
}

@media (max-width: 1024px) {
    .hero {
        padding-top: 50px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    /* 縦並びでは帯を画面幅いっぱいに */
    .hero-plate {
        padding: 2.2rem 1rem 2rem;
    }

    .hero-plate::before,
    .hero-plate::after {
        left: -50vw;
        right: -50vw;
        clip-path: none;
        border-radius: 0;
    }

    .hero-badges {
        justify-content: center;
    }

    .cta-card {
        margin: 0 auto;
    }

    .hero-image {
        max-width: 460px;
        margin: 0 auto;
    }

    .hero-strings {
        opacity: 0.3;
    }

    .instructor-content {
        grid-template-columns: 1fr;
    }

    .instructor-photo-container {
        position: static;
        max-width: 400px;
        margin: 0 auto;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .access-content {
        grid-template-columns: 1fr;
    }

    .stat-divider {
        display: none;
    }

    .stats-grid {
        gap: var(--spacing-md) var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .cta-card {
        max-width: 100%;
    }

    .hero-badge-item {
        max-width: none;
    }

    .gilded-frame {
        padding: 14px;
    }

    .hero-image-badge {
        bottom: 18px;
        left: 18px;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3.5rem;
    }

    .nav-title {
        font-size: 1.02rem;
    }

    .hero {
        min-height: auto;
        padding: 40px 0 70px;
    }

    .hero-badge {
        font-size: 0.78rem;
        padding: 4px 12px;
        letter-spacing: 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .hero-subtitle br {
        display: none;
    }

    .hero-badge-item {
        min-width: 0;
        flex: 1 1 30%;
        flex-direction: column;
        text-align: center;
        padding: 0.7rem 0.4rem;
        gap: 4px;
    }

    .badge-text {
        font-size: 0.75rem;
    }

    .section-title {
        font-size: 1.85rem;
    }

    .instructor-name {
        font-size: 2rem;
    }

    .lesson-simple-amount {
        font-size: 3rem;
    }

    .trial-content h3 {
        font-size: 1.6rem;
    }

    .stat-number {
        font-size: 2.2rem;
    }
}