:root {
    --primary-color: #ff8df1; /* Pink */
    --secondary-color: #8dfdff; /* Cyan */
    --accent-color: #ffe88d; /* Gold/Yellow */
    --bg-dark: rgba(30, 10, 40, 0.8);
    --glass-bg: rgba(255, 255, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.4);
    --font-main: 'Outfit', 'Noto Sans JP', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    background-color: #1a1a1a;
    font-family: var(--font-main);
    overflow: hidden;
    color: white;
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#factory-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('bomb_factory_bg.png');
    background-size: cover;
    background-position: center;
    filter: brightness(0.8) contrast(1.1);
    z-index: 1;
}

#ui-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    z-index: 100;
}

.ui-left-group {
    display: flex;
    gap: 20px;
}

#score-board, #difficulty-indicator {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--glass-border);
    padding: 10px 20px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
}

#score-value, #speed-value {
    font-size: 2rem;
    font-weight: 700;
    text-shadow: 0 0 10px var(--primary-color);
}

#btn-ranking-open {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    color: white;
    padding: 10px 15px;
    border-radius: 10px;
    cursor: pointer;
    backdrop-filter: blur(5px);
    transition: all 0.3s;
}

#btn-ranking-open:hover {
    background: var(--primary-color);
    border-color: white;
}

/* 爆弾のアニメーション用 */
#play-area {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 10;
}

.bomb {
    position: absolute;
    width: 80px;
    height: 80px;
    background-size: contain;
    background-repeat: no-repeat;
    z-index: 20;
    filter: drop-shadow(0 5px 15px rgba(0,0,0,0.5));
    transform: translate(-50%, -50%); /* 常に中心がパス上にくるように */
}

.bomb-black { background-image: url('bomb_black.png'); }
.bomb-red { background-image: url('bomb_red.png'); }

/* コンベアベルトの共通スタイル */
.belt-path {
    position: absolute;
    background: #444;
    border: 4px solid #666;
    overflow: hidden;
    z-index: 10;
}

.belt-path::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 100%;
    background: repeating-linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.1) 0,
        rgba(255, 255, 255, 0.1) 20px,
        transparent 20px,
        transparent 40px
    );
    animation: belt-scroll-x 2s linear infinite;
}

/* U字(S字)レイアウトの再配置 (スケッチに基づく) */
#start-box {
    position: absolute;
    right: 10%;
    bottom: 10%;
    width: 140px;
    height: 140px;
    background: #555;
    border: 5px solid #777;
    border-radius: 10px;
    z-index: 12;
    background-image: 
        linear-gradient(45deg, #444 25%, transparent 25%, transparent 50%, #444 50%, #444 75%, transparent 75%, transparent),
        radial-gradient(circle at 70% 30%, rgba(255,255,255,0.1) 0%, transparent 50%);
    background-size: 20px 20px, 100% 100%;
}

.belt-s1 {
    right: 18%;
    bottom: 18%; /* JSの 0.82 (bottom: 18%) に合わせる */
    width: 65%;
    height: 60px;
}
.belt-s1::after { animation: belt-scroll-x 2s linear infinite; } /* 右から左へなら、逆向きの可能性もある。JSに合わせて調整。ここではデフォルトxはプラス方向 */

.belt-s2 {
    left: 17%;
    bottom: 18%; /* s1の高さに合わせる */
    width: 60px;
    height: 62%;
}
.belt-s2::after {
    background: repeating-linear-gradient(
        0deg,
        rgba(255, 255, 255, 0.1) 0,
        rgba(255, 255, 255, 0.1) 20px,
        transparent 20px,
        transparent 40px
    );
    animation: belt-scroll-y-neg 2s linear infinite;
    width: 100%; height: 200%;
}

.belt-s3 {
    left: 17%;
    top: 20%;
    width: calc(33% + 15px); /* 分岐点と確実に重ねる */
    height: 60px;
    border-right: none; /* 境界線を消す */
}
.belt-s3::after { animation: belt-scroll-x-neg 2s linear infinite; } /* 右向き */

.belt-s-black {
    left: 50%;
    top: 0;
    width: 60px;
    height: 20%;
    transform: translateX(-50%);
}
.belt-s-black::after {
    background: repeating-linear-gradient(
        0deg,
        rgba(255, 255, 255, 0.1) 0,
        rgba(255, 255, 255, 0.1) 20px,
        transparent 20px,
        transparent 40px
    );
    animation: belt-scroll-y-neg 2s linear infinite;
    width: 100%; height: 200%;
}

.belt-s4 {
    left: 50%;
    top: 20%;
    width: calc(30% + 30px); /* 80%の角（中心）+ベルト厚みの半分(30px)で止める */
    height: 60px;
    z-index: 10;
    border-left: none;
}
.belt-s4::after { animation: belt-scroll-x-neg 2s linear infinite; } /* 右向き */

.belt-s-red {
    left: 80%;
    top: 0;
    width: 60px;
    height: calc(20% + 60px); /* TopRow厚み分 下に伸ばす */
    transform: translateX(-50%);
    border-bottom: none;
    z-index: 11;
}
.belt-s-red::after {
    background: repeating-linear-gradient(
        0deg,
        rgba(255, 255, 255, 0.1) 0,
        rgba(255, 255, 255, 0.1) 20px,
        transparent 20px,
        transparent 40px
    );
    animation: belt-scroll-y-neg 2s linear infinite;
    width: 100%; height: 200%;
}

.start-actions {
    display: flex;
    gap: 15px;
    width: 100%;
    margin-top: 10px;
}

.start-actions button {
    flex: 1;
}

button.secondary {
    background: #333;
    color: #fff;
    border: 2px solid #555;
}

button.secondary:hover {
    background: #444;
    border-color: #777;
    transform: translateY(-2px);
}
}

@keyframes belt-scroll-x {
    from { transform: translateX(0); }
    to { transform: translateX(-40px); }
}

@keyframes belt-scroll-x-neg {
    from { transform: translateX(-40px); }
    to { transform: translateX(0); }
}

@keyframes belt-scroll-y-neg {
    from { transform: translateY(0); }
    to { transform: translateY(-40px); }
}
/* マシン（仕分け口）のデザインを復元 */
.machine {
    position: absolute;
    width: 140px;
    height: 140px;
    background: var(--bg-dark);
    border: 5px solid white;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 12;
    box-shadow: 0 0 30px rgba(0,0,0,0.5);
}

.machine-label {
    font-size: 0.7rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.machine-entry {
    width: 70px;
    height: 70px;
    background: black;
    border-radius: 50%;
    border: 3px dashed var(--glass-border);
}

#machine-black {
    left: 50%;
    top: 20px;
    transform: translateX(-50%);
    border-color: #a0a0a0;
}

#machine-red {
    left: 80%;
    top: 20px;
    transform: translateX(-50%);
    border-color: #ff4d4d;
}

#junction-arrow {
    position: absolute;
    top: calc(20% + 30px); /* ベルトの中心高さ */
    left: 50%;
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 30;
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.arrow-inner {
    font-size: 5rem; /* 最大級に大きく */
    color: #ffff00; /* 鮮やかなイエロー */
    text-shadow: 
        0 0 15px #ffff00,
        0 0 30px #ffff00,
        0 0 10px rgba(0,0,0,0.8);
    font-weight: 900;
    animation: arrow-glow 0.8s infinite alternate;
}

#junction-arrow.arrow-right {
    transform: translate(-50%, -50%) rotate(0deg);
}

#junction-arrow.arrow-down {
    transform: translate(-50%, -50%) rotate(270deg); /* 270度 = 上向き */
}

@keyframes arrow-glow {
    from { opacity: 0.6; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1.1); }
}
.modal {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-dark);
    border: 3px solid var(--primary-color);
    padding: 40px;
    border-radius: 30px;
    text-align: center;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 0 50px var(--primary-color);
}

h1 {
    font-size: 3rem;
    line-height: 1;
    margin-bottom: 20px;
}

h1 span {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.how-to {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
}

.how-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.8rem;
}

.how-item img {
    width: 60px;
    margin-bottom: 10px;
}

#username {
    width: 100%;
    padding: 15px;
    border-radius: 10px;
    border: 2px solid var(--glass-border);
    background: rgba(0,0,0,0.3);
    color: white;
    font-size: 1.1rem;
    margin-bottom: 20px;
    text-align: center;
}

button {
    background: var(--primary-color);
    border: none;
    color: white;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
    margin: 5px;
}

button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px var(--primary-color);
}

/* Animations */
@keyframes explode {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(2); opacity: 0.8; filter: brightness(2); }
    100% { transform: scale(3); opacity: 0; }
}

.explosion {
    animation: explode 0.5s forwards;
    background: radial-gradient(circle, #fff 0%, var(--primary-color) 50%, transparent 100%);
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    z-index: 50;
}

.bounce {
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

#ranking-list {
    margin: 20px 0;
    text-align: left;
    max-height: 300px;
    overflow-y: auto;
}

.rank-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    border-bottom: 1px solid var(--glass-border);
}

.rank-item:nth-child(1) { color: var(--accent-color); font-weight: 700; }

/* Mobile Adjustments */
@media (max-width: 768px) {
    #ui-overlay {
        top: auto;
        bottom: 20px;
        left: 20px;
        right: auto;
        flex-direction: column;
        align-items: flex-start;
    }

    .ui-left-group {
        flex-direction: column;
        gap: 10px;
    }

    #score-value, #speed-value {
        font-size: 1.5rem;
    }

    .label {
        font-size: 0.6rem;
    }

    #score-board, #difficulty-indicator {
        padding: 5px 15px;
    }
}