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

body {
    background-color: #000;
    display: flex; justify-content: center; align-items: center;
    height: 100vh; height: 100dvh; width: 100vw;
    overflow: hidden; touch-action: none; user-select: none; -webkit-user-select: none;
}

#game-container {
    position: relative; aspect-ratio: 9 / 16;
    max-width: 100vw; max-height: 100vh; max-height: 100dvh;
    background-color: #000;
    overflow: hidden; 
    clip-path: inset(0px 0px 0px 0px); 
}

#game-container canvas { width: 100% !important; height: 100% !important; display: block; touch-action: none; background: transparent; }

#game-ui.hidden { display: none; }

#score-board {
    position: absolute; top: 3%; left: 5%; color: #ffffff;
    font-size: clamp(20px, 4vw, 32px); font-family: 'Courier New', Courier, monospace; font-weight: bold;
    z-index: 10; pointer-events: none; text-shadow: 0 0 10px rgba(0,0,0,0.8);
}

.btn {
    padding: 15px 30px; font-size: 20px; font-family: 'Courier New', Courier, monospace;
    font-weight: bold; cursor: pointer; border: none; border-radius: 5px;
    background: #fff; color: #000; transition: all 0.2s;
    box-shadow: 0 4px 0 #888;
}
@media (hover: hover) {
    .btn:hover { transform: translateY(-3px); box-shadow: 0 7px 0 #888; background: #eee; }
    .btn:active { transform: translateY(2px); box-shadow: 0 2px 0 #888; }
}
.btn:active { transform: translateY(2px); box-shadow: 0 2px 0 #888; }

#boss-ui {
    position: absolute; top: 10%; left: 50%; transform: translateX(-50%); width: 80%;
    z-index: 15; pointer-events: none; text-align: center;
}
#boss-ui.hidden { display: none; }

.boss-name { color: #ff3333; font-family: 'Courier New', monospace; font-weight: bold; font-size: clamp(16px, 3vw, 24px); margin-bottom: 5px; text-shadow: 0 0 5px #000; }
.hp-bar-container { width: 100%; height: 20px; background: rgba(50, 0, 0, 0.6); border: 2px solid #ff3333; border-radius: 10px; overflow: hidden; }
#hp-bar-fill { height: 100%; width: 100%; background: linear-gradient(90deg, #ff0000, #ff6666); transition: width 0.2s ease-out; }

/* 致死量警告ライン */
#danger-line {
    position: absolute; top: 50%; left: 0; width: 100%; height: 3px;
    background: repeating-linear-gradient(90deg, transparent, transparent 15px, rgba(255, 0, 0, 0.8) 15px, rgba(255, 0, 0, 0.8) 30px);
    z-index: 5; pointer-events: none; transition: opacity 0.5s; box-shadow: 0 0 15px red; opacity: 1;
}
#danger-line.hidden { opacity: 0; }

#fever-notice {
    position: absolute; top: 40%; left: 50%; transform: translate(-50%, -50%); width: 100%;
    text-align: center; font-size: clamp(30px, 6vw, 48px); font-family: 'Arial Black', sans-serif;
    z-index: 120; pointer-events: none; font-weight: bold; transition: opacity 0.5s;
}
#fever-notice.hidden { display: none; }

#pause-btn, .audio-toggle {
    position: absolute; background: rgba(0, 0, 0, 0.6); border: 2px solid #555;
    color: #fff; font-size: clamp(20px, 4vw, 32px); border-radius: 8px;
    padding: 5px 10px; cursor: pointer; z-index: 100;
}
#pause-btn { top: 3%; right: 5%; }
#audio-toggle-btn { top: 3%; right: 20%; font-size: clamp(18px, 3.5vw, 28px); }
.audio-toggle:active, #pause-btn:active { background: rgba(255, 255, 255, 0.2); }
#pause-btn:disabled, .audio-toggle:disabled {
    opacity: 0.5;
    filter: grayscale(1);
    cursor: not-allowed;
    background: rgba(100, 100, 100, 0.4);
}
#title-audio-btn { position: relative; top: 0; right: 0; font-size: clamp(16px, 3vw, 22px); border: 1px solid #aaa; background: transparent; }

/* オーバーレイ UI */
.overlay-screen {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.75); color: white; display: flex;
    justify-content: center; align-items: center; text-align: center; z-index: 90;
}
.overlay-screen.hidden { display: none; }

#title-background {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; overflow: hidden; z-index: 80;
}

.title-overlay { background: transparent; backdrop-filter: blur(2px); }
.title-content {
    background: rgba(0, 0, 0, 0.5); padding: 40px; border-radius: 20px;
    border: 2px solid rgba(255,255,255,0.2); box-shadow: 0 0 20px rgba(0,0,0,0.8);
    display: flex; flex-direction: column; align-items: center;
}
.main-title {
    font-size: clamp(40px, 8vw, 70px); font-family: 'Arial Black', sans-serif;
    background: linear-gradient(to right, #ffcc00, #ff6600); -webkit-background-clip: text;
    color: transparent; margin-bottom: 5px; filter: drop-shadow(0 0 5px rgba(255,100,0,0.5));
}
.title-sub { font-size: clamp(14px, 2.5vw, 20px); color: #ccc; margin-bottom: 30px; }

.button-group { display: flex; flex-direction: column; width: 100%; gap: 10px; }

.main-btn {
    background: linear-gradient(135deg, #ff9900, #ff3300); color: #fff;
    border: 2px solid #ffcc00; padding: 15px 30px; font-size: 20px; font-weight: bold;
    border-radius: 30px; cursor: pointer; transition: 0.2s; box-shadow: 0 5px 15px rgba(255,100,0,0.4); pointer-events: auto;
    width: 100%;
}
.endless-btn { background: linear-gradient(135deg, #cc00ff, #3300ff); border-color: #ff00ff; box-shadow: 0 5px 15px rgba(200,0,255,0.4); }
.main-btn:hover { transform: scale(1.05); filter: brightness(1.2); }
.main-btn:active { transform: scale(0.95); }

/* ポーズ画面のPAUSED文字は特大にする */
#pause-overlay .main-text {
    font-size: 80px !important;
}

.overlay-content .main-text { font-size: clamp(40px, 8vw, 64px); font-family: 'Courier New', monospace; font-weight: bold; letter-spacing: 5px; margin-bottom: 20px; }
.overlay-content .sub-text { font-size: clamp(16px, 3vw, 24px); color: #cccccc; margin-bottom: 30px; }

.text-rainbow {
    background: linear-gradient(to right, #ff0000, #ffff00, #00ff00, #00ffff, #0000ff, #ff00ff);
    -webkit-background-clip: text; color: transparent; animation: rainbow-anim 3s linear infinite;
}
@keyframes rainbow-anim { 0% { filter: hue-rotate(0deg); } 100% { filter: hue-rotate(360deg); } }

#effects-container { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 50; overflow: hidden; }

/* クレジット画面のスタイル */
#credits-overlay {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 150;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* 上から流すために top 合わせ */
    overflow: hidden;
}

#credits-overlay.hidden {
    display: none;
}

#credits-container {
    width: 100%;
    height: 100%;
    position: relative;
}

/* クレジットスクロールの基本スタイル (アニメーションはJSで動的に生成) */
#credits-content {
    position: absolute;
    width: 100%;
    text-align: center;
    padding: 0 20px;
    will-change: transform;
}

@keyframes credits-scroll-dynamic {
    /* JSで --scroll-start, --scroll-pause, --scroll-end を設定 */
    0% { transform: translateY(var(--scroll-start)); }
    90% { transform: translateY(var(--scroll-pause)); }
    96% { transform: translateY(var(--scroll-pause)); }
    100% { transform: translateY(var(--scroll-end)); }
}

.credits-section {
    margin-bottom: 80px;
    font-family: 'Courier New', Courier, monospace;
}

.chicken-intro {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 80px; /* スケールアップに合わせて広げる */
}

.chicken-icon {
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

/* 巨大化したチキン用のマージン調整 */
#icon-dead, #icon-boss {
    margin-bottom: 55px;
}

#icon-rainbow {
    animation: rainbow-anim 1.5s linear infinite; /* 少しゆっくりにして目に優しく */
    filter: saturate(2) brightness(1.1);
}

.credits-section h2 {
    font-size: 28px;
    color: #ffcc00;
    margin-bottom: 20px;
    text-shadow: 0 0 10px rgba(255, 204, 0, 0.5);
}

.credits-section h3 {
    font-size: 22px;
    color: #ff9900;
    margin-top: 30px;
    margin-bottom: 10px;
}

.credits-section p {
    font-size: 19px; /* 少し大きく */
    font-weight: 500; /* 少し太くしてチラつき防止 */
    color: #ffffff;
    margin-bottom: 10px;
    line-height: 1.6;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5); /* 視認性向上 */
    -webkit-font-smoothing: antialiased;
}

.credits-thanks {
    font-size: 42px !important; /* さらに大きく */
    font-family: 'Arial Black', sans-serif;
    font-weight: 900;
    color: #ffcc00 !important;
    text-shadow: 0 0 20px rgba(255, 204, 0, 0.8), 2px 2px 4px rgba(0,0,0,0.5);
    margin-top: 50px;
}

.effect { position: absolute; transform: translate(-50%, -50%); pointer-events: none; animation-fill-mode: forwards; }

.effect-normal { font-size: 40px; animation: anim-normal 0.4s ease-out forwards; }
@keyframes anim-normal { 0% { transform: translate(-50%, -50%) scale(0.5); opacity: 1; } 100% { transform: translate(-50%, -80%) scale(2.0); opacity: 0; } }
.effect-bomb { font-size: 80px; animation: anim-bomb 0.6s ease-out forwards; }
@keyframes anim-bomb { 0% { transform: translate(-50%, -50%) scale(0.5); opacity: 1; filter: brightness(2) drop-shadow(0 0 10px red); } 50% { transform: translate(-50%, -50%) scale(2.5); opacity: 1; filter: brightness(1); } 100% { transform: translate(-50%, -50%) scale(3.0); opacity: 0; } }
.effect-gold { font-size: 50px; animation: anim-gold 0.8s ease-out forwards; }
@keyframes anim-gold { 0% { transform: translate(-50%, -50%) scale(0.5) rotate(0deg); opacity: 1; } 50% { transform: translate(-50%, -80%) scale(2.0) rotate(180deg) drop-shadow(0 0 20px gold); opacity: 1; } 100% { transform: translate(-50%, -120%) scale(0.5) rotate(360deg); opacity: 0; } }

/* スコア表示エフェクト */
.score-effect {
    position: absolute; pointer-events: none;
    font-family: 'Arial Black', sans-serif; font-weight: bold; font-size: 22px;
    text-shadow: 2px 2px 4px #000; animation: score-float 0.8s ease-out forwards;
    z-index: 60;
}
.score-white { color: #ffffff; }
.score-yellow { color: #ffff00; }
.score-minus { color: #ff0000; }
@keyframes score-float {
    0% { transform: translate(-50%, -50%) scale(0.5); opacity: 0; }
    20% { transform: translate(-50%, -100%) scale(1.2); opacity: 1; }
    100% { transform: translate(-50%, -200%) scale(1.0); opacity: 0; }
}

/* 隠しクレジットトリガーのスタイル */
#hidden-credits-trigger {
    position: absolute;
    bottom: -50px;
    right: -20px;
    width: 60px;
    height: 60px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    cursor: pointer;
    opacity: 0.6;
    transition: 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    filter: drop-shadow(0 0 8px rgba(255,255,255,0.4));
    z-index: 10;
}
#hidden-credits-trigger:hover {
    opacity: 1;
    transform: scale(1.2) rotate(15deg);
    filter: drop-shadow(0 0 12px rgba(255,255,255,0.9));
}