:root {
            /* 配色 70:25:5の法則 */
            --color-bg: #0a0a0a;
            /* ベースカラー 70% - 背景 */
            --color-bg-alt: #0e0e0e;
            --color-text: #f5f5f5;
            /* メインカラー 25% - テキスト・見出し */
            --color-accent: #ff3d00;
            /* アクセントカラー 5% - CTA・強調 */
            --color-accent-hover: #ff5722;
            --color-muted: rgba(245, 245, 245, 0.45);
            --font-emotional: 'Noto Serif JP', serif;
            --font-functional: 'IBM Plex Mono', monospace;
            --space-unit: clamp(4rem, 8vw, 7rem);
            /* タップターゲット最小サイズ（モバイルファースト） */
            --tap-target-min: 44px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

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

        body {
            background: var(--color-bg);
            color: var(--color-text);
            font-family: var(--font-emotional);
            overflow-x: hidden;
        }

        /* ========================================
           GLOBAL NOISE OVERLAY
        ======================================== */
        .noise {
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 9999;
            opacity: 0.02;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
        }

        /* ========================================
           HERO SECTION
        ======================================== */
        .hero {
            position: relative;
            min-height: 100vh;
            min-height: 100dvh;
            display: flex;
            flex-direction: column;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            overflow: hidden;
            z-index: 0;
        }

        .hero-video {
            position: absolute;
            top: 50%;
            left: 50%;
            min-width: 100%;
            min-height: 100%;
            width: auto;
            height: auto;
            transform: translate(-50%, -50%);
            object-fit: cover;
        }

        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg,
                    rgba(10, 10, 10, 0.4) 0%,
                    rgba(10, 10, 10, 0.2) 35%,
                    rgba(10, 10, 10, 0.2) 65%,
                    rgba(10, 10, 10, 0.5) 100%);
            z-index: 1;
        }

        .hero-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, transparent 0%, rgba(10, 10, 10, 0.25) 100%);
            z-index: 2;
        }

        /* ========================================
           CORNER ANCHOR LAYOUT
        ======================================== */
        .corner {
            position: fixed;
            z-index: 100;
            mix-blend-mode: difference;
        }

        .corner--tl {
            top: 2.5rem;
            left: 3rem;
        }

        .corner--tr {
            top: 2.5rem;
            right: 3rem;
        }

        .corner--bl {
            bottom: 2.5rem;
            left: 3rem;
        }

        .corner--br {
            bottom: 2.5rem;
            right: 3rem;
        }

        .side {
            position: fixed;
            z-index: 100;
            mix-blend-mode: difference;
        }

        .side--left {
            left: 3rem;
            top: 50%;
            transform: translateY(-50%) rotate(-90deg);
            transform-origin: left center;
        }

        .side--right {
            right: 3rem;
            top: 50%;
            transform: translateY(-50%) rotate(90deg);
            transform-origin: right center;
        }

        /* Brand - ロゴは左上、クリックでトップへ戻る（UIの不変ルール） */
        .brand {
            font-family: var(--font-functional);
            font-size: 0.65rem;
            font-weight: 500;
            letter-spacing: 0.22em;
            text-transform: uppercase;
            color: var(--color-text);
            text-decoration: none;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .brand:hover {
            color: var(--color-accent);
        }

        .brand span {
            color: var(--color-accent);
        }

        /* Navigation - 一貫性のあるナビゲーション */
        .nav {
            display: flex;
            gap: 2.5rem;
            align-items: center;
        }

        .nav-link {
            font-family: var(--font-functional);
            font-size: 0.6rem;
            font-weight: 500;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            color: var(--color-text);
            text-decoration: none;
            opacity: 0.85;
            transition: opacity 0.3s ease, color 0.3s ease;
            /* モバイルファースト: タップターゲット確保 */
            min-height: var(--tap-target-min);
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0;
        }

        .nav-link:hover {
            opacity: 1;
            color: var(--color-accent);
        }

        /* 右上のCTA - Zの法則: 右上にゴール（お問い合わせ・応募）を配置 */
        .nav-cta {
            font-family: var(--font-functional);
            font-size: 0.55rem;
            font-weight: 600;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--color-bg);
            background: var(--color-accent);
            text-decoration: none;
            padding: 0.7rem 1.2rem;
            border: 1px solid var(--color-accent);
            transition: all 0.3s ease;
            min-height: var(--tap-target-min);
            display: inline-flex;
            align-items: center;
        }

        .nav-cta:hover {
            background: transparent;
            color: var(--color-accent);
        }

        /* Side Meta */
        .meta {
            font-family: var(--font-functional);
            font-size: 0.55rem;
            font-weight: 500;
            letter-spacing: 0.35em;
            text-transform: uppercase;
            color: var(--color-text);
            opacity: 0.7;
            white-space: nowrap;
        }

        /* Copyright & Social */
        .copyright {
            font-family: var(--font-functional);
            font-size: 0.5rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            color: var(--color-text);
            opacity: 0.4;
        }

        .social {
            display: flex;
            gap: 2rem;
        }

        .social-link {
            font-family: var(--font-functional);
            font-size: 0.55rem;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--color-text);
            text-decoration: none;
            opacity: 0.7;
            transition: opacity 0.3s ease, color 0.3s ease;
            /* モバイルファースト: タップターゲット確保 */
            min-height: var(--tap-target-min);
            display: inline-flex;
            align-items: center;
            padding: 0.5rem;
        }

        .social-link:hover {
            opacity: 1;
            color: var(--color-accent);
        }

        /* ========================================
           HERO CONTENT - 左揃え、画面を広く使う
        ======================================== */
        .hero-content {
            position: relative;
            z-index: 10;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: flex-start;
            text-align: left;
            /* 左パディングを控えめに、右は狭く */
            padding: 8rem clamp(2rem, 4vw, 6rem) 6rem clamp(2rem, 6vw, 8rem);
            width: 100%;
        }

        /* 右側の装飾的な大きなタイポグラフィ */
        .hero-deco {
            position: absolute;
            right: clamp(2rem, 5vw, 8rem);
            top: 50%;
            transform: translateY(-50%);
            z-index: 5;
            pointer-events: none;
        }

        .hero-deco-text {
            font-family: var(--font-emotional);
            font-size: clamp(8rem, 20vw, 18rem);
            font-weight: 900;
            line-height: 0.85;
            letter-spacing: -0.05em;
            color: transparent;
            -webkit-text-stroke: 1px rgba(255, 61, 0, 0.15);
            writing-mode: vertical-rl;
            text-orientation: mixed;
            opacity: 0;
        }

        .hero-deco-sub {
            position: absolute;
            right: clamp(1rem, 3vw, 5rem);
            bottom: 20%;
            font-family: var(--font-functional);
            font-size: clamp(0.5rem, 1vw, 0.7rem);
            font-weight: 500;
            letter-spacing: 0.3em;
            color: rgba(255, 255, 255, 0.1);
            writing-mode: vertical-rl;
            text-transform: uppercase;
            z-index: 5;
        }

        /* 装飾的な線 */
        .hero-lines {
            position: absolute;
            right: clamp(6rem, 12vw, 16rem);
            top: 30%;
            height: 40%;
            width: 1px;
            background: linear-gradient(180deg, transparent, rgba(255, 61, 0, 0.2), transparent);
            z-index: 5;
        }

        .hero-lines::before {
            content: '';
            position: absolute;
            left: clamp(2rem, 4vw, 5rem);
            top: 20%;
            height: 60%;
            width: 1px;
            background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.05), transparent);
        }

        /* 余白（ホワイトスペース）- 近接の法則: 関係のある要素は近づけ、関係のない要素とは離す */

        .pre-title {
            font-family: var(--font-functional);
            font-size: 0.7rem;
            font-weight: 500;
            letter-spacing: 0.4em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 1.5rem;
            opacity: 0;
        }

        .main-title {
            font-family: var(--font-functional);
            font-weight: 700;
            /* 大胆に大きく - 空白をフォントで埋める */
            font-size: clamp(2rem, 6vw, 4.5rem);
            line-height: 1.25;
            letter-spacing: 0.02em;
            margin-bottom: 2.5rem;
            /* 画面幅をより広く使う */
            max-width: 90%;
            opacity: 0;
            text-transform: uppercase;
        }

        .main-title .highlight {
            color: var(--color-accent);
        }

        .main-title .gemini {
            background: linear-gradient(135deg, #4285f4 0%, #34a853 33%, #fbbc05 66%, #ea4335 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* ハッシュタグ（エントリーセクション用） */
        .hashtag {
            font-family: var(--font-functional);
            font-size: 0.6rem;
            letter-spacing: 0.05em;
            color: var(--color-muted);
            margin-bottom: 2rem;
        }

        .subtitle {
            font-family: var(--font-emotional);
            font-size: 1.1rem;
            font-weight: 400;
            color: rgba(245, 245, 245, 0.75);
            max-width: 400px;
            line-height: 1.7;
            opacity: 0;
        }

        /* ヒーローのアクションエリア - 横並び */
        .hero-actions {
            display: flex;
            align-items: center;
            gap: clamp(2rem, 5vw, 5rem);
            margin-top: 3rem;
            flex-wrap: wrap;
            width: 100%;
        }

        /* CTA - 立体的で直感的にクリックできるボタン */
        .cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.75rem;
            font-family: var(--font-functional);
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--color-bg);
            background: var(--color-accent);
            text-decoration: none;
            padding: 1.1rem 2.5rem;
            border: 2px solid var(--color-accent);
            transition: all 0.35s ease;
            opacity: 0;
            box-shadow: 0 4px 15px rgba(255, 61, 0, 0.3),
                0 2px 6px rgba(255, 61, 0, 0.2);
            min-height: var(--tap-target-min);
        }

        .cta:hover {
            background: var(--color-accent-hover);
            border-color: var(--color-accent-hover);
            box-shadow: 0 6px 20px rgba(255, 61, 0, 0.4),
                0 3px 10px rgba(255, 61, 0, 0.3);
            transform: translateY(-2px);
            gap: 1rem;
        }

        .cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(255, 61, 0, 0.3);
        }

        .cta-arrow {
            transition: transform 0.35s ease;
        }

        .cta:hover .cta-arrow {
            transform: translateX(4px);
        }

        /* Event Date - 横並び用 */
        .event-date {
            text-align: left;
            opacity: 0;
            padding-left: clamp(1.5rem, 3vw, 3rem);
            border-left: 1px solid rgba(255, 255, 255, 0.15);
        }

        .event-date-label {
            font-family: var(--font-functional);
            font-size: 0.5rem;
            font-weight: 500;
            letter-spacing: 0.45em;
            text-transform: uppercase;
            color: var(--color-muted);
            margin-bottom: 0.6rem;
        }

        .event-date-value {
            font-family: var(--font-functional);
            font-size: 0.7rem;
            font-weight: 500;
            letter-spacing: 0.12em;
            color: var(--color-muted);
            display: flex;
            align-items: baseline;
            justify-content: center;
            gap: 0.25em;
        }

        .event-date-value .day {
            font-family: var(--font-emotional);
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: -0.02em;
            line-height: 1;
        }

        /* Scroll Indicator */
        .scroll-indicator {
            position: absolute;
            bottom: 3%;
            /* 左揃えレイアウトに合わせて左下に配置 */
            left: clamp(3rem, 10vw, 15rem);
            transform: none;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 0.4rem;
            opacity: 0;
        }

        .scroll-indicator span {
            font-family: var(--font-functional);
            font-size: 0.45rem;
            font-weight: 500;
            letter-spacing: 0.3em;
            text-transform: uppercase;
            color: var(--color-muted);
        }

        .scroll-line {
            width: 1px;
            height: 28px;
            background: linear-gradient(180deg, var(--color-muted), transparent);
        }

        /* ========================================
           ENTRY SECTION - 左揃えレイアウト
        ======================================== */
        .entry-section {
            position: relative;
            padding: var(--space-unit) clamp(3rem, 8vw, 12rem) var(--space-unit) clamp(3rem, 10vw, 15rem);
            background: var(--color-bg);
        }

        .entry-card {
            max-width: 700px;
            /* 左揃え - margin: 0 autoをやめる */
            margin: 0;
            padding: clamp(2.5rem, 5vw, 4rem) clamp(2rem, 4vw, 3.5rem);
            border-left: 3px solid var(--color-accent);
            border-top: none;
            border-right: none;
            border-bottom: none;
            background: linear-gradient(90deg, rgba(255, 61, 0, 0.05) 0%, transparent 40%);
            text-align: left;
            opacity: 0;
        }

        .entry-label {
            font-family: var(--font-functional);
            font-size: 0.6rem;
            font-weight: 600;
            letter-spacing: 0.35em;
            color: var(--color-accent);
            margin-bottom: 1.5rem;
        }

        .entry-title {
            font-family: var(--font-emotional);
            font-size: clamp(1.6rem, 3.5vw, 2.2rem);
            font-weight: 700;
            margin-bottom: 2rem;
            letter-spacing: 0.02em;
        }

        .entry-steps {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }

        .entry-step {
            font-family: var(--font-emotional);
            font-size: clamp(0.95rem, 1.8vw, 1.1rem);
            /* 行間は文字サイズの1.5〜1.8倍が最も読みやすい */
            line-height: 1.7;
            color: rgba(245, 245, 245, 0.8);
        }

        .entry-step strong {
            color: var(--color-accent);
            font-weight: 700;
        }

        .hashtag-copy-container {
            margin-top: 2rem;
            padding: 1.5rem;
            border: 1px dashed rgba(255, 61, 0, 0.4);
            background: rgba(255, 61, 0, 0.05);
            border-radius: 4px;
        }

        .hashtag-copy-label {
            font-family: var(--font-functional);
            font-size: 0.55rem;
            font-weight: 600;
            letter-spacing: 0.25em;
            color: var(--color-muted);
            margin-bottom: 0.8rem;
            text-transform: uppercase;
        }

        .hashtag-copy-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.8rem;
            background: rgba(255, 61, 0, 0.1);
            border: 1px solid rgba(255, 61, 0, 0.3);
            border-radius: 4px;
            cursor: pointer;
            font-family: var(--font-functional);
            font-size: clamp(0.65rem, 1.5vw, 0.8rem);
            color: var(--color-accent);
            /* モバイルファースト: タップターゲット確保 */
            padding: 0.8rem 1rem;
            min-height: var(--tap-target-min);
            transition: all 0.3s ease;
            word-break: break-all;
            text-align: left;
        }

        .hashtag-copy-btn:hover {
            color: var(--color-text);
            background: rgba(255, 61, 0, 0.15);
            border-color: rgba(255, 61, 0, 0.5);
        }

        .hashtag-copy-btn .copy-icon {
            flex-shrink: 0;
            width: 18px;
            height: 18px;
            opacity: 0.7;
            transition: opacity 0.3s ease;
        }

        .hashtag-copy-btn:hover .copy-icon {
            opacity: 1;
        }

        .hashtag-copy-btn.copied {
            color: #34a853;
        }

        .hashtag-copy-btn.copied .copy-icon {
            opacity: 1;
        }

        /* ========================================
           INFO SECTION - 非対称グリッド
        ======================================== */
        .info-section {
            position: relative;
            padding: var(--space-unit) clamp(3rem, 8vw, 12rem) var(--space-unit) clamp(3rem, 10vw, 15rem);
            background: var(--color-bg-alt);
        }

        .info-grid {
            max-width: 1000px;
            /* 左揃え */
            margin: 0;
            display: grid;
            /* 非対称グリッド: 左カラムを少し狭く */
            grid-template-columns: 1fr 1.2fr;
            gap: clamp(3rem, 6vw, 6rem);
        }

        .info-card {
            padding: 0;
            opacity: 0;
            /* 左に縦線アクセント */
            border-left: 1px solid rgba(255, 61, 0, 0.3);
            padding-left: 1.5rem;
        }



        .info-label {
            font-family: var(--font-functional);
            font-size: 0.55rem;
            font-weight: 600;
            letter-spacing: 0.3em;
            color: var(--color-accent);
            margin-bottom: 1.2rem;
        }

        .info-title {
            font-family: var(--font-emotional);
            font-size: clamp(1.1rem, 2vw, 1.35rem);
            font-weight: 700;
            margin-bottom: 0.9rem;
            line-height: 1.5;
        }

        .info-text {
            font-family: var(--font-emotional);
            font-size: 0.85rem;
            color: var(--color-muted);
            /* 行間は文字サイズの1.5〜1.8倍が最も読みやすい */
            line-height: 1.8;
        }

        .info-link {
            display: inline-block;
            margin-top: 1rem;
            font-family: var(--font-functional);
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.1em;
            color: var(--color-accent);
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .info-link:hover {
            color: var(--color-text);
            transform: translateX(4px);
        }

        /* ========================================
           VENUE SECTION - 左揃え + 大きなタイポグラフィ
        ======================================== */
        .venue-section {
            position: relative;
            padding: var(--space-unit) clamp(3rem, 8vw, 12rem) var(--space-unit) clamp(3rem, 10vw, 15rem);
            text-align: left;
            background: var(--color-bg);
        }

        .venue-inner {
            display: flex;
            align-items: flex-end;
            gap: clamp(2rem, 5vw, 5rem);
            flex-wrap: wrap;
        }

        .venue-main {
            flex: 1;
            min-width: 280px;
        }

        .venue-meta {
            text-align: right;
        }

        .venue-label {
            font-family: var(--font-functional);
            font-size: 0.55rem;
            font-weight: 600;
            letter-spacing: 0.4em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 1.2rem;
        }

        .venue-name {
            font-family: var(--font-emotional);
            font-size: clamp(1.5rem, 4vw, 2.8rem);
            font-weight: 700;
            margin-bottom: 0.6rem;
            letter-spacing: -0.01em;
            line-height: 1.2;
        }

        .venue-address {
            font-family: var(--font-functional);
            font-size: 0.75rem;
            color: var(--color-muted);
            letter-spacing: 0.02em;
        }

        .venue-date {
            font-family: var(--font-functional);
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--color-text);
            letter-spacing: 0.12em;
        }

        .venue-date span {
            color: var(--color-accent);
        }

        .venue-date-large {
            font-family: var(--font-emotional);
            font-size: clamp(3rem, 8vw, 6rem);
            font-weight: 900;
            color: var(--color-accent);
            line-height: 1;
            letter-spacing: -0.03em;
        }

        /* ========================================
           THEME SONG SECTION - 左揃え + 背景画像右寄せ
        ======================================== */
        .theme-song-section {
            position: relative;
            padding: var(--space-unit) clamp(3rem, 8vw, 12rem) var(--space-unit) clamp(3rem, 10vw, 15rem);
            background: var(--color-bg-alt);
            overflow: hidden;
            display: flex;
            justify-content: flex-start;
            align-items: center;
            text-align: left;
            min-height: 70vh;
        }

        .theme-song-section::before {
            content: '';
            position: absolute;
            /* 画像を右側に配置して非対称に */
            top: 0;
            right: 0;
            bottom: 0;
            width: 60%;
            background-image: url('../images/Sara.png');
            background-size: cover;
            background-position: center right;
            opacity: 0.5;
            z-index: 0;
        }

        .theme-song-section::after {
            content: '';
            position: absolute;
            inset: 0;
            /* 左から右へのグラデーションで左側を読みやすく */
            background: linear-gradient(90deg, var(--color-bg-alt) 0%, var(--color-bg-alt) 30%, rgba(10, 10, 10, 0.5) 60%, rgba(10, 10, 10, 0.3) 100%);
            z-index: 1;
        }

        .theme-content {
            position: relative;
            z-index: 10;
            max-width: 600px;
        }

        .theme-label {
            font-family: var(--font-functional);
            font-size: 0.6rem;
            font-weight: 600;
            letter-spacing: 0.35em;
            color: var(--color-accent);
            margin-bottom: 1.5rem;
            display: block;
        }

        .artist-name {
            font-family: var(--font-emotional);
            font-size: clamp(2.5rem, 6vw, 5rem);
            font-weight: 900;
            line-height: 1.1;
            margin-bottom: 1rem;
            background: linear-gradient(to right, #fff, #999);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .artist-desc {
            font-family: var(--font-functional);
            font-size: clamp(0.7rem, 1.5vw, 0.9rem);
            letter-spacing: 0.2em;
            color: var(--color-muted);
            margin-bottom: 0;
            text-transform: uppercase;
        }

        .song-container {
            /* 左に縦線アクセント */
            border-left: 2px solid var(--color-accent);
            padding: 1.5rem 0 1.5rem 1.5rem;
            margin-top: 2rem;
        }

        .song-label {
            display: block;
            font-family: var(--font-functional);
            font-size: 0.55rem;
            letter-spacing: 0.3em;
            color: var(--color-accent);
            margin-bottom: 0.5rem;
            text-transform: uppercase;
        }

        .song-title {
            font-family: var(--font-emotional);
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            font-weight: 400;
            font-style: italic;
            letter-spacing: 0.05em;
        }

        .theme-play-btn {
            margin-top: 1.5rem;
            background: transparent;
            border: 2px solid var(--color-accent);
            color: var(--color-accent);
            font-family: var(--font-functional);
            font-size: 0.65rem;
            font-weight: 600;
            padding: 1rem 2.5rem;
            cursor: pointer;
            text-transform: uppercase;
            letter-spacing: 0.2em;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.6rem;
            /* モバイルファースト: タップターゲット確保 */
            min-height: var(--tap-target-min);
        }

        .theme-play-btn:hover {
            background: var(--color-accent);
            color: var(--color-bg);
            box-shadow: 0 4px 15px rgba(255, 61, 0, 0.3);
            transform: translateY(-2px);
        }

        .theme-play-btn:active {
            transform: translateY(0);
        }

        /* ========================================
           FOOTER - 横並び非対称レイアウト
        ======================================== */
        .footer {
            padding: clamp(3rem, 5vw, 4rem) clamp(3rem, 8vw, 12rem) clamp(3rem, 5vw, 4rem) clamp(3rem, 10vw, 15rem);
            background: var(--color-bg-alt);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
        }

        /* フッターCTA - 立体的で目立つボタン */
        .footer-cta {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.9rem;
            font-family: var(--font-functional);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            color: var(--color-bg);
            background: var(--color-accent);
            text-decoration: none;
            padding: 1.3rem 3rem;
            border: 2px solid var(--color-accent);
            transition: all 0.35s ease;
            /* 立体感を出す影 */
            box-shadow: 0 4px 20px rgba(255, 61, 0, 0.35),
                0 2px 8px rgba(255, 61, 0, 0.25);
            /* モバイルファースト: タップターゲット確保 */
            min-height: var(--tap-target-min);
        }

        .footer-cta:hover {
            background: var(--color-accent-hover);
            border-color: var(--color-accent-hover);
            box-shadow: 0 6px 25px rgba(255, 61, 0, 0.45),
                0 3px 12px rgba(255, 61, 0, 0.35);
            transform: translateY(-3px);
        }

        .footer-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px rgba(255, 61, 0, 0.3);
        }

        .footer-text {
            font-family: var(--font-functional);
            font-size: 0.5rem;
            font-weight: 500;
            letter-spacing: 0.3em;
            text-transform: uppercase;
            color: var(--color-muted);
        }

        /* ========================================
           ANIMATIONS
        ======================================== */


        @keyframes float {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(6px);
            }
        }

        /* ========================================
           RESPONSIVE - モバイルファースト
        ======================================== */
        @media (max-width: 900px) {
            .info-grid {
                grid-template-columns: 1fr;
                gap: 2.5rem;
            }

            .venue-inner {
                flex-direction: column;
                align-items: flex-start;
            }

            .venue-meta {
                text-align: left;
            }
        }

        @media (max-width: 768px) {

            .corner,
            .side {
                display: none;
            }

            .mobile-header {
                display: flex;
                justify-content: space-between;
                align-items: center;
                padding: 1.2rem 1.5rem 0;
                position: relative;
                z-index: 100;
            }

            /* モバイルでも左揃えを維持 */
            .hero-content {
                padding: 5rem 1.5rem 4rem;
            }

            .entry-section {
                padding: var(--space-unit) 1.5rem;
            }

            .entry-card {
                padding: 2rem 1.5rem;
            }

            .info-section {
                padding: var(--space-unit) 1.5rem;
            }

            .info-card {
                padding-left: 1rem;
            }

            .venue-section {
                padding: var(--space-unit) 1.5rem;
            }

            .theme-song-section {
                padding: var(--space-unit) 1.5rem;
            }

            .theme-song-section::before {
                width: 100%;
                opacity: 0.3;
            }

            .footer {
                padding: 2.5rem 1.5rem;
                flex-direction: column;
                align-items: flex-start;
            }

            .event-date {
                position: relative;
                bottom: auto;
                left: auto;
                transform: none;
                margin-top: 2.5rem;
            }

            .scroll-indicator {
                display: none;
            }

            /* モバイルでは装飾要素を非表示 */
            .hero-deco,
            .hero-lines,
            .hero-deco-sub {
                display: none;
            }

            /* モバイルではアクションエリアを縦並びに */
            .hero-actions {
                flex-direction: column;
                align-items: flex-start;
                gap: 2rem;
            }

            .hero-content .event-date {
                border-left: none;
                padding-left: 0;
                border-top: 1px solid rgba(255, 255, 255, 0.15);
                padding-top: 1.5rem;
            }

            .nav {
                gap: 0.8rem;
            }

            .nav-link {
                font-size: 0.55rem;
                padding: 0.4rem 0;
            }

            /* モバイル用CTA */
            .nav-cta {
                font-size: 0.5rem;
                padding: 0.6rem 0.9rem;
            }

            /* CTAボタンのモバイル調整 */
            .cta {
                padding: 1rem 2rem;
                font-size: 0.7rem;
            }

            .footer-cta {
                padding: 1.1rem 2rem;
                font-size: 0.7rem;
            }

            .venue-date-large {
                font-size: clamp(2.5rem, 15vw, 4rem);
            }
        }

        @media (min-width: 769px) {
            .mobile-header {
                display: none;
            }
        }