:root {
    --color-bg: #0a0a0a;
    --color-ink: #1c1c1c;
    --color-crimson: #e63946;
    --color-crimson-glow: rgba(230, 57, 70, 0.4);
    --color-gold: #d4af37;
    --color-gold-glow: rgba(212, 175, 55, 0.3);
    --color-text-main: #f4f4f4;
    --color-text-muted: #888888;
    
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Zen Kaku Gothic New', sans-serif;
    
    --glass-bg: rgba(28, 28, 28, 0.6);
    --glass-border: rgba(255, 255, 255, 0.05);
}

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

html {
    background-color: var(--color-bg);
    background: radial-gradient(circle at 50% 50%, #1a1a1a 0%, #000000 100%);
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    overflow: hidden;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    
    /* iOS Safari仮想キーボード時のオーバースクロール・ズレ防止対策 */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    
    background: radial-gradient(circle at 50% 50%, #1a1a1a 0%, #000000 100%);
}

#app {
    position: relative;
    width: 100%;
    min-width: 320px;
    height: 100vh;
    height: 100dvh; /* iOS Safari対策 */
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 50px rgba(0,0,0,0.9);
    border-left: 1px solid rgba(255,255,255,0.05);
    border-right: 1px solid rgba(255,255,255,0.05);
    overflow: hidden;
}

/* スクリーンの切り替えアニメーション */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease, transform 0.4s ease;
    transform: scale(0.98);
    overflow-y: auto;
    overflow-x: hidden;
    padding-top: 64px; /* ヘッダー分の余白 */
    scroll-padding-top: 64px;
}

.screen.active {
    opacity: 1;
    pointer-events: auto;
    transform: scale(1);
}

/* タイトル・リザルト・ランキング画面共通：中央揃えだが、溢れる場合は上端からスクロール */
#screen-title, #screen-result, #screen-ranking {
    justify-content: flex-start;
}

/* 疑似要素でコンテンツを挟むことで、余裕があるときだけ中央に寄せる（安全な中央揃え） */
#screen-title::before, #screen-title::after,
#screen-result::before, #screen-result::after,
#screen-ranking::before, #screen-ranking::after {
    content: '';
    flex: 1;
    min-height: 20px;
    pointer-events: none;
}

.title-container, .result-container, .ranking-container {
    flex-shrink: 0;
    z-index: 1;
}


/* タイトル画面 */
.menu-container {
    text-align: center;
    z-index: 2;
    width: 100%;
    max-width: 450px;
}

.game-title {
    font-family: var(--font-serif);
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: 0.1em;
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.title-ruby {
    display: block;
    font-size: 1.2rem;
    color: var(--color-crimson);
    letter-spacing: 0.2em;
    margin-bottom: -0.5rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    margin-bottom: 0;
}

.title-header {
    margin-bottom: 4rem;
}

/* メニュー（和風ミニマル） */
.main-menu {
    display: flex;
    flex-direction: column;
    gap: 0;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* 名乗り設定メニュー項目 */
.name-setting-item {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.2rem 1rem 1rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    z-index: 10;
    overflow: hidden;
}

.name-setting-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1px;
    background: var(--color-crimson);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--color-crimson);
}

.name-setting-item:hover::before,
.name-setting-item:focus-within::before {
    width: 100%;
}

.name-setting-item:hover {
    background: rgba(255, 255, 255, 0.02);
}

.name-setting-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.15em;
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    transition: color 0.3s ease;
}

.name-setting-item:hover .name-setting-label,
.name-setting-item:focus-within .name-setting-label {
    color: var(--color-crimson);
}

.player-name-input {
    width: 100%;
    max-width: 280px;
    background: transparent;
    border: none;
    color: var(--color-text-main);
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: 0.1em;
    outline: none;
    padding: 0.2rem 0;
    transition: all 0.3s ease;
}

.player-name-input:focus {
    text-shadow: 0 0 10px var(--color-crimson-glow);
}

.player-name-error {
    font-size: 0.75rem;
    color: var(--color-crimson);
    margin-top: 0.4rem;
    min-height: 1.2rem;
    text-align: center;
}

.menu-item {
    width: 100%;
    appearance: none;
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 1.5rem 1rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    z-index: 10;
    overflow: hidden;
    user-select: none;
}



.menu-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1px;
    background: var(--color-crimson);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--color-crimson);
}

/* 煌めきエフェクト（抜刀の閃光） */
.menu-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: -150%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transform: skewX(-25deg);
    transition: left 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.02);
}

.menu-item:hover::before {
    width: 100%;
}

.menu-item:hover::after {
    left: 150%;
}

.menu-label {
    width: 100%;
    text-align: center;
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text-main);
    letter-spacing: 0.2em;
    margin-bottom: 0.2rem;
    transition: transform 0.3s ease;
}

.menu-item:hover .menu-label {
    color: var(--color-crimson);
    transform: translateY(-2px);
}

.menu-desc {
    width: 100%;
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    opacity: 0.6;
}

.menu-item:hover .menu-desc {
    opacity: 1;
}

/* ボタン（共通ベース、リザルトなどで使用） */

.btn {
    appearance: none;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--color-text-main);
    padding: 1.2rem 2.5rem;
    border-radius: 0px;
    font-family: var(--font-serif);
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    border-color: rgba(230, 57, 70, 0.3);
    box-shadow: 0 0 15px var(--color-crimson-glow);
}

.btn-primary:hover {
    background: rgba(230, 57, 70, 0.15);
    border-color: var(--color-crimson);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--color-crimson-glow);
}

.btn-primary .btn-text {
    color: var(--color-crimson);
}

.btn-text {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.btn-subtext {
    font-size: 0.8rem;
    font-family: var(--font-sans);
    color: var(--color-text-muted);
}

/* バトル画面 HUD */
.hud {
    position: absolute;
    top: 74px; /* ヘッダー(64px) + 余白(10px) */
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 600px;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    pointer-events: none;
}

.hud-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(5px);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud-label {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
}

.hud-value {
    font-size: 1.2rem;
    font-family: var(--font-serif);
    font-weight: 700;
}

.mode-name {
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-gold);
    border-color: rgba(212, 175, 55, 0.3);
    box-shadow: 0 0 10px var(--color-gold-glow);
    padding: 0.5rem 1rem;
    letter-spacing: 0.1em;
}

/* 敵の頭上のネームプレート（和風ミニマル） */
.enemy-nameplate {
    position: absolute;
    top: -35px; /* 敵キャラクターコンテナの上部外側に配置 */
    left: 50%;
    transform: translateX(-50%);
    background: rgba(10, 10, 10, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    padding: 4px 16px;
    font-size: 0.9rem;
    font-family: var(--font-serif);
    font-weight: 700;
    letter-spacing: 0.15em;
    white-space: nowrap;
    z-index: 10;
    border-radius: 2px;
    pointer-events: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}

/* バトル領域（タップ判定領域） */
.battle-area {
    position: absolute;
    top: 64px; /* ヘッダーの下から開始 */
    left: 0;
    width: 100%;
    height: calc(100% - 64px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: crosshair;
    z-index: 5;
    touch-action: none; /* タッチズームやスクロールの遅延を回避 */
    -webkit-tap-highlight-color: transparent; /* タップ時の青いハイライトを消去 */
}

.signal-text {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 0.2em;
    transition: transform 0.1s;
}

.signal-text.waiting {
    color: #fff;
    text-shadow: 0 0 10px rgba(0,0,0,0.8);
    animation: pulse 2s infinite alternate;
}

.signal-text.go {
    color: var(--color-crimson);
    font-size: 4.5rem;
    text-shadow: 0 0 30px var(--color-crimson);
    transform: scale(1.1);
}

.signal-text.clash {
    color: var(--color-gold);
    font-size: 4rem;
    text-shadow: 0 0 30px var(--color-gold);
}

@keyframes pulse {
    0% { opacity: 0.4; }
    100% { opacity: 1; }
}

.instruction {
    position: absolute;
    bottom: 10%;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.2);
    letter-spacing: 0.1em;
    pointer-events: none;
}

/* 斬撃エフェクト（毛筆風・巨大な一閃） */
.slash-effect {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 250%;
    height: 16px;
    background: linear-gradient(90deg, transparent, #ffffff 15%, #ffffff 85%, transparent);
    box-shadow: 0 0 25px #ffffff, 0 0 50px var(--color-crimson), 0 0 100px var(--color-crimson);
    transform: translate(-50%, -50%) rotate(-30deg) scaleX(0);
    opacity: 0;
    pointer-events: none;
    z-index: 15;
}

.slash-effect.active {
    animation: slashAnim 0.35s cubic-bezier(0.15, 0.85, 0.2, 1) forwards;
}

@keyframes slashAnim {
    0% { transform: translate(-50%, -50%) rotate(-30deg) scaleX(0); opacity: 1; height: 4px; }
    30% { transform: translate(-50%, -50%) rotate(-30deg) scaleX(1); opacity: 1; height: 24px; }
    100% { transform: translate(-50%, -50%) rotate(-30deg) scaleX(1); opacity: 0; height: 1px; }
}

/* リザルト画面 */
.result-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 25px 20px;
    width: 90%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
}

.result-heading {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--color-text-main);
    margin-bottom: 1.2rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 0.8rem;
    letter-spacing: 0.2em;
}

.result-stats {
    display: flex;
    flex-direction: row;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.stat-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(0,0,0,0.4);
    padding: 0.8rem 0.5rem;
    border-radius: 4px;
    border-top: 3px solid var(--color-gold);
    gap: 0.3rem;
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.stat-value {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-value.highlight {
    color: var(--color-gold);
    text-shadow: 0 0 10px var(--color-gold-glow);
}

.unit {
    font-size: 0.8rem;
    font-family: var(--font-sans);
    color: var(--color-text-muted);
}

.title-award {
    margin-bottom: 1.5rem;
}

.award-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.award-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-crimson);
    letter-spacing: 0.1em;
    text-shadow: 0 0 15px var(--color-crimson-glow);
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.action-buttons .btn-primary,
.action-buttons .btn-register {
    grid-column: 1 / -1;
}

/* 番付登録ボタン（金色テーマ） */
.btn-register {
    border-color: rgba(212, 175, 55, 0.4);
    box-shadow: 0 0 15px var(--color-gold-glow);
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-gold);
    padding: 1rem;
    transition: all 0.3s ease;
}

.btn-register:hover:not(:disabled) {
    background: rgba(212, 175, 55, 0.12);
    border-color: var(--color-gold);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--color-gold-glow);
}

/* 登録済み状態：控えめな表示に切り替え */
.btn-register.registered {
    background: rgba(212, 175, 55, 0.05);
    border-color: rgba(212, 175, 55, 0.15);
    box-shadow: none;
    color: var(--color-text-muted);
    cursor: default;
    transform: none;
    font-size: 0.9rem;
}

.btn-register:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.btn-share {
    flex-direction: row;
    gap: 0.5rem;
    padding: 1rem;
    background: #0f1419; /* X.com black */
    border-color: rgba(255,255,255,0.2);
}

.btn-share:hover {
    background: #1a1f24;
    border-color: rgba(255,255,255,0.4);
}

.btn-text {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    padding: 0.8rem;
    font-size: 0.9rem;
}

.btn-text:hover {
    color: var(--color-text-main);
}

/* =========================================
   環境演出（AI生成背景、桜）
========================================= */
.game-stage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    max-height: 100%;
    aspect-ratio: 16 / 9;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
    transition: filter 0.3s ease;
}

/* 画面揺れ演出（敗北時） */
.game-stage.shake {
    animation: screenShake 0.4s cubic-bezier(.36,.07,.19,.97) both;
    transform: translate3d(-50%, -50%, 0); /* 既存の中央揃えと統合 */
}

@keyframes screenShake {
    10%, 90% { transform: translate3d(-50%, -50%, 0) translate3d(-6px, -3px, 0); }
    20%, 80% { transform: translate3d(-50%, -50%, 0) translate3d(10px, 5px, 0); }
    30%, 50%, 70% { transform: translate3d(-50%, -50%, 0) translate3d(-14px, -7px, 0); }
    40%, 60% { transform: translate3d(-50%, -50%, 0) translate3d(14px, 7px, 0); }
}

.environment {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

.bg-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center bottom;
    opacity: 0.8; /* UIを見やすくするため少し暗くする */
    filter: brightness(0.9) contrast(1.1);
}

.sakura-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 2;
}

.petal {
    position: absolute;
    top: -20px;
    width: 10px;
    height: 14px;
    background: #ffb7c5;
    border-radius: 50% 0 50% 0;
    opacity: 0.8;
    animation: fall linear infinite;
    box-shadow: 0 0 5px rgba(255, 183, 197, 0.5);
}

@keyframes fall {
    0% { transform: translateY(-20px) rotate(0deg) translateX(0); opacity: 0; }
    10% { opacity: 0.8; }
    90% { opacity: 0.8; }
    100% { transform: translateY(100vh) rotate(360deg) translateX(100px); opacity: 0; }
}

/* =========================================
   対面対峙型レイアウト（一人称デュエルシーン）
========================================= */
.duel-scene {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 4;
    pointer-events: none;
    perspective: 1000px;
    overflow: hidden;
}

/* 敵キャラクターコンテナ */
.enemy-container {
    position: absolute;
    bottom: 12%; /* 道に足を合わせる */
    left: 50%;
    transform: translateX(-50%) translateZ(0) scale(0.9);
    width: 380px;
    height: 380px;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
    z-index: 5;
    transform-origin: bottom center;
}

/* 通常時の呼吸アニメーション */
.enemy-container.breathing {
    animation: enemyBreath 3.5s ease-in-out infinite alternate;
}

@keyframes enemyBreath {
    0% { transform: translateX(-50%) translateY(0) scale(0.95); }
    100% { transform: translateX(-50%) translateY(-6px) scale(0.965); }
}

/* Ready... 時の徐々なズームイン（緊張感の演出） */
.enemy-container.zooming {
    animation: tensionZoom 6s cubic-bezier(0.15, 0.85, 0.2, 1) forwards;
}

@keyframes tensionZoom {
    0% { transform: translateX(-50%) translateY(0) scale(0.85); }
    100% { transform: translateX(-50%) translateY(12px) scale(1.1); }
}

/* 敗北時：敵が画面いっぱいに斬り込んでくる演出 */
.enemy-container.attacking {
    animation: enemyStrike 0.35s cubic-bezier(0.15, 0.85, 0.2, 1) forwards;
}

@keyframes enemyStrike {
    0% { transform: translateX(-50%) scale(1.1); filter: brightness(1); }
    30% { transform: translateX(-50%) scale(1.6) translateY(30px); filter: brightness(1.6) drop-shadow(0 0 30px rgba(230,57,70,0.8)); }
    100% { transform: translateX(-50%) scale(2.2) translateY(80px); filter: brightness(2) opacity(0); }
}

/* 両断スプリット（勝利時） */
.enemy-half {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.1, 0.9, 0.2, 1), opacity 0.5s ease, filter 0.4s ease;
}

.enemy-half svg {
    width: 100%;
    height: 100%;
}

.enemy-half image {
    width: 100%;
    height: 100%;
}

/* 斜めのクリップパスで左右に両断 */
.enemy-left {
    clip-path: polygon(0 0, 68% 0, 32% 100%, 0 100%);
}

.enemy-right {
    clip-path: polygon(68% 0, 100% 0, 100% 100%, 32% 100%);
}

/* スライス時の吹き飛びアニメーション */
.enemy-half.sliced-left {
    transform: translate(-100px, 40px) rotate(-18deg);
    opacity: 0;
    filter: brightness(2) drop-shadow(0 0 15px white);
}

.enemy-half.sliced-right {
    transform: translate(100px, -40px) rotate(12deg);
    opacity: 0;
    filter: brightness(2) drop-shadow(0 0 15px white);
}

/* プレイヤーの刀（手前・構え） */
.player-katana {
    position: absolute;
    bottom: -6%;
    left: 50%;
    transform: translateX(-50%) translateZ(100px) scale(0.9);
    width: 420px;
    height: 420px;
    z-index: 10;
    pointer-events: none;
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-origin: bottom center;
}

.player-katana svg {
    width: 100%;
    height: 100%;
}

.player-katana image {
    width: 100%;
    height: 100%;
}

/* 構え時の微細な揺れ（緊迫した呼吸感） */
.player-katana.breathing {
    animation: katanaBreath 4s ease-in-out infinite alternate;
}

@keyframes katanaBreath {
    0% { transform: translateX(-50%) translateY(4px) rotate(0deg) scale(0.9); }
    100% { transform: translateX(-50%) translateY(-2px) rotate(0.4deg) scale(0.91); }
}

/* 抜刀一閃（勝利時に高速で画面外へスイングアウト） */
.player-katana.slashing {
    animation: katanaSlash 0.3s cubic-bezier(0.1, 0.9, 0.15, 1) forwards;
}

@keyframes katanaSlash {
    0% { transform: translateX(-50%) translateY(0) rotate(0deg) scale(0.9); }
    25% { transform: translateX(-80%) translateY(40px) rotate(-30deg) scale(0.85); opacity: 0.8; }
    100% { transform: translateX(-180%) translateY(140px) rotate(-70deg) scale(0.7); opacity: 0; }
}

/* レスポンシブ調整（モバイル） */
@media (max-width: 600px) {
    /* 画面全体のスクロールを回避するための余白圧縮 */
    .screen {
        padding-top: 56px; /* ヘッダーの高さを考慮しつつコンパクトに */
    }
    
    /* タイトルセクションの最適化：1行に収めて縦幅を劇的に削減 */
    .title-header {
        margin-bottom: 2rem; /* 4remから削減 */
    }
    .game-title {
        font-size: 2.2rem; /* 3.5remから削減し、改行による見切れを完全に防止 */
        letter-spacing: 0.05em;
        line-height: 1.1;
    }
    .title-ruby {
        font-size: 0.9rem; /* 1.2remから削減 */
        margin-bottom: -0.2rem;
    }
    .subtitle {
        font-size: 0.85rem;
    }

    /* 名乗り（プレイヤー名）設定の最適化 */
    .name-setting-item {
        padding: 0.9rem 1rem 0.7rem 1rem;
    }
    .player-name-input {
        font-size: 1.3rem;
    }
    
    /* メニューボタンの最適化 */
    .menu-item {
        padding: 1.1rem 1rem;
    }
    .menu-label {
        font-size: 1.3rem;
    }
    .menu-desc {
        font-size: 0.7rem;
    }

    /* 広告スペースの余白削減 */
    .ad-container {
        margin-top: 1.5rem; /* 5remから大幅削減 */
    }

    /* バトルステージの最適化 */
    .game-stage {
        aspect-ratio: 1 / 1;
    }
    .enemy-container {
        width: 280px;
        height: 280px;
        bottom: 14%;
    }
    .player-katana {
        width: 320px;
        height: 320px;
        bottom: -10%;
    }

    /* ゲームプレイ画面（バトルHUD）のモバイル最適化 */
    .hud {
        top: 86px; /* ヘッダーやiOSのセーフエリアと重ならないよう位置を下げて余裕を確保 */
    }
    .hud-item {
        padding: 0.35rem 0.7rem; /* よりコンパクトにして情報がすっきり収まるように */
    }
    .hud-value {
        font-size: 1rem; /* テキストサイズを適正化 */
    }
    .mode-name {
        font-size: 0.85rem;
        padding: 0.35rem 0.7rem;
    }
}



/* =========================================
   ランキング画面（番付）
========================================= */
.ranking-container {
    width: 90%;
    max-width: 500px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    z-index: 10;
}

.ranking-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    color: var(--color-gold);
    margin-bottom: 20px;
    text-shadow: 0 0 10px rgba(212, 175, 55, 0.3);
}

.ranking-tabs {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 25px;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-text-muted);
    padding: 8px 15px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.tab-btn.active {
    background: var(--color-gold);
    color: var(--color-bg-dark);
    border-color: var(--color-gold);
    font-weight: bold;
}

.ranking-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 350px;
    overflow-y: auto;
    padding-right: 5px;
}

.ranking-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    border: 1px solid transparent;
}

.ranking-item.top-1 { border-color: var(--color-gold); background: rgba(212, 175, 55, 0.1); }
.ranking-item.top-2 { border-color: #c0c0c0; background: rgba(192, 192, 192, 0.05); }
.ranking-item.top-3 { border-color: #cd7f32; background: rgba(205, 127, 50, 0.05); }
.ranking-item.you { border: 1px dashed var(--color-gold); }

.rank {
    font-family: var(--font-serif);
    font-weight: 900;
    width: 30px;
    text-align: left;
}

.top-1 .rank { color: var(--color-gold); font-size: 1.4rem; }

.ranking-item .name {
    flex: 1;
    text-align: left;
    margin-left: 15px;
}

.ranking-item .score {
    font-weight: bold;
    color: var(--color-text-main);
}

/* =========================================
   広告用プレースホルダー & コンテナ
 ========================================= */
.ad-container {
    margin-top: 5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    position: relative;
    z-index: 1;
}

@media (max-height: 600px) {
    .ad-container {
        margin-top: 2rem;
    }
}

/* 判定演出（勝利・敗北・フラッシュ） */
.flash-effect {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    opacity: 0;
    z-index: 100;
    pointer-events: none;
}

.flash-effect.active {
    animation: flash-anim 0.5s ease-out;
}

@keyframes flash-anim {
    0% { opacity: 0.8; }
    100% { opacity: 0; }
}

/* 勝利・敗北のオーバーレイ */
.outcome-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 50;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    text-shadow: 0 0 20px rgba(0,0,0,0.8);
}

.outcome-overlay.win {
    background: radial-gradient(circle, rgba(255,215,0,0.1) 0%, rgba(0,0,0,0) 70%);
}

.outcome-overlay.lose {
    background: rgba(139, 0, 0, 0.3);
}

.outcome-overlay.active {
    opacity: 1;
}

.outcome-big-text {
    font-size: 5rem;
    font-weight: 900;
    margin-bottom: 10px;
    transform: scale(2);
    opacity: 0;
}

.outcome-overlay.active .outcome-big-text {
    animation: outcome-text-anim 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes outcome-text-anim {
    0% { transform: scale(3); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.win .outcome-big-text {
    color: #ffd700; /* 金色 */
    filter: drop-shadow(0 0 10px rgba(255,215,0,0.5));
}

.lose .outcome-big-text {
    color: #ff3333; /* 鮮血色 */
}

.tap-to-continue {
    font-family: 'Zen Kaku Gothic New', sans-serif;
    color: white;
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    animation: blink-anim 1.5s infinite;
    margin-top: 30px;
}

@keyframes blink-anim {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

/* モバイル調整 */
@media (max-width: 600px) {
    .outcome-big-text {
        font-size: 3.5rem;
    }
}

.ad-label {
    font-size: 0.6rem;
    color: var(--color-text-muted);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.6;
    font-weight: 700;
}
.ad-placeholder {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.7rem;
    transition: border-color 0.3s ease;
}

.banner-ad {
    width: 320px;
    height: 50px;
}

.rectangle-ad {
    width: 300px;
    height: 250px;
}

.rectangle-container {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

/* =========================================
   Portal Header Styles
========================================= */
.portal-header {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    background-color: rgba(5, 5, 10, 0.6);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-family: var(--font-sans);
}
.portal-header-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; justify-content: space-between; align-items: center; height: 64px;
}
.portal-logo a {
    font-size: 1.25rem; font-weight: 700; color: var(--color-crimson); text-decoration: none; letter-spacing: -0.05em;
}
.portal-nav { display: flex; gap: 24px; }
.portal-nav a {
    color: rgba(255, 255, 255, 0.5); font-weight: 500; text-decoration: none; font-size: 1rem; transition: color 0.2s;
}
.portal-nav a:hover { color: #fff; }
@media (max-width: 768px) { .portal-nav { display: none; } }

/* =========================================
   BGM Control Panel Styles (Wafu/Japanese)
========================================= */
.bgm-control {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 1100; /* Ensure it is above portal-header and game-stage */
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 6px 12px;
    border-radius: 30px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.bgm-control:hover {
    border-color: var(--color-crimson);
    box-shadow: 0 4px 20px var(--color-crimson-glow);
}

.bgm-btn {
    background: none;
    border: none;
    color: var(--color-text-main);
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), color 0.2s ease;
    outline: none;
}

.bgm-btn:active {
    transform: scale(0.85);
}

.bgm-btn.muted {
    color: var(--color-text-muted);
}

.bgm-slider-container {
    display: flex;
    align-items: center;
    width: 0;
    overflow: hidden;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* PC: Hover to expand */
@media (hover: hover) {
    .bgm-control:hover .bgm-slider-container {
        width: 80px;
    }
}

/* Mobile & Touch or JS-triggered active class to expand */
.bgm-control.active .bgm-slider-container {
    width: 80px;
}

.bgm-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
    transition: background 0.3s;
}

.bgm-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-crimson);
    cursor: pointer;
    transition: transform 0.15s ease, background-color 0.15s ease;
    box-shadow: 0 0 8px var(--color-crimson-glow);
}

.bgm-slider::-webkit-slider-thumb:hover {
    transform: scale(1.3);
    background: var(--color-gold);
    box-shadow: 0 0 10px var(--color-gold-glow);
}

.bgm-slider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    border: none;
    border-radius: 50%;
    background: var(--color-crimson);
    cursor: pointer;
    transition: transform 0.15s ease, background-color 0.15s ease;
    box-shadow: 0 0 8px var(--color-crimson-glow);
}

.bgm-slider::-moz-range-thumb:hover {
    transform: scale(1.3);
    background: var(--color-gold);
    box-shadow: 0 0 10px var(--color-gold-glow);
}

/* Ensure controls are slightly lower or optimized on extreme mobile displays so they don't cover UI elements */
@media (max-width: 480px) {
    .bgm-control {
        bottom: 16px;
        right: 16px;
        padding: 4px 8px;
    }
    .bgm-btn {
        font-size: 1.1rem;
        width: 28px;
        height: 28px;
    }
    /* Touch device expansion */
    .bgm-control.active .bgm-slider-container {
        width: 70px;
    }
}