/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    background-color: #050510;
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
    height: 100vh;
    width: 100vw;
}

canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

/* HUD 布局 */
.hud {
    position: absolute;
    padding: 20px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
}

.hud-left, .hud-center, .hud-right {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.hud-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    align-items: center;
}

.hud-item {
    font-size: 18px;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(255,255, 255, 0.5);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 颜色定义 */
.text-cyan { color: #0ff; text-shadow: 0 0 15px #0ff; }
.text-red { color: #f05; text-shadow: 0 0 15px #f05; }
.text-green { color: #0f0; text-shadow: 0 0 15px #0f0; }
.text-orange { color: #fa0; text-shadow: 0 0 15px #fa0; }
.text-purple { color: #a0f; text-shadow: 0 0 15px #a0f; }
.text-white { color: #fff; text-shadow: 0 0 15px #fff; }
.text-yellow { color: #ff0; text-shadow: 0 0 15px #ff0; }
.text-grey { color: #aaa; text-shadow: 0 0 15px #555; }
.text-gold { color: #ffd700; text-shadow: 0 0 15px #ffd700; font-weight: bold; }
.text-energy { color: #0f8; text-shadow: 0 0 15px #0f8; font-weight: bold; } /* 能量颜色 */

/* 冷却遮罩样式 */
.cooldown-wrapper {
    position: relative;
    width: 60px;
    height: 10px;
    background: #333;
    border-radius:5px;
    overflow: hidden;
    border: 1px solid #555;
}
.cooldown-bar {
    height: 100%;
    background: #0ff;
    width: 100%;
    transform-origin: left;
    transition: width 0.1s linear;
}

/* 静音按钮 */
#mute-btn {
    pointer-events: auto;
    background: rgba(0,0,0,0.5);
    border: 1px solid #666;
    color: #aaa;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}
#mute-btn:hover { color: #fff; border-color: #fff; }

/* 菜单屏幕 */
.menu-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 5, 16, 0.95);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    pointer-events: auto;
    transition: opacity 0.3s ease;
    z-index: 20;
}

.hidden {
    opacity: 0;
    pointer-events: none;
    display: none; /* 完全隐藏元素，不占据空间 */
}

h1 {
    font-size: 60px;
    margin-bottom: 0px;
    background: linear-gradient(45deg, #0ff, #f0f);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
    letter-spacing: 5px;
    filter: drop-shadow(0 0 20px rgba(0, 255, 255, 0.5));
    text-align: center;
}

p.subtitle {
    font-size: 18px;
    color: #aaa;
    margin-bottom: 20px;
    text-align: center;
    line-height: 1.5;
}

.menu-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
    font-size: 20px;
}

.btn {
    background: transparent;
    color: #0ff;
    font-size: 24px;
    padding: 15px 40px;
    border: 2px solid #0ff;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
    font-weight: bold;
    text-transform: uppercase;
    margin: 5px;
}

.btn:hover {
    background: #0ff;
    color: #000;
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.8);
    transform: scale(1.05);
}

.btn-shop {
    border-color: #fa0;
    color: #fa0;
    box-shadow: 0 0 15px rgba(255, 170, 0, 0.2);
    font-size: 18px;
    padding: 10px 30px;
}
.btn-shop:hover {
    background: #fa0;
    box-shadow: 0 0 30px rgba(255, 170, 0, 0.8);
}

.btn-danger {
    border-color: #f05;
    color: #f05;
    box-shadow: 0 0 15px rgba(255, 0, 85, 0.2);
    font-size: 16px;
    padding: 8px 20px;
    margin-top: 10px;
}
.btn-danger:hover {
    background: #f05;
    box-shadow: 0 0 30px rgba(255, 0, 85, 0.8);
}

/* 商店界面 */
#shop-screen {
    background: rgba(10, 10, 20, 0.98);
    z-index: 25; 
}

.shop-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 80%;
    max-width: 800px;
    margin-bottom: 20px;
    border-bottom: 2px solid #fa0;
    padding-bottom: 10px;
}

.shop-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    width: 80%;
    max-width: 800px;
    height: 60vh;
    overflow-y: auto;
}

.shop-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid #444;
    padding: 15px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s;
}

.shop-item:hover {
    border-color: #fa0;
    background: rgba(255, 170, 0, 0.1);
}

.shop-item-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.shop-item-title {
    font-size: 18px;
    color: #fa0;
    font-weight: bold;
}

.shop-item-level {
    font-size: 14px;
    color: #aaa;
}

.shop-item-desc {
    font-size: 13px;
    color: #ccc;
    margin-bottom: 10px;
    flex-grow: 1;
}

.shop-item-btn {
    background: #fa0;
    color: #000;
    border: none;
    padding: 8px;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
}

.shop-item-btn:disabled {
    background: #555;
    cursor: not-allowed;
    color: #888;
}
.shop-item-btn:not(:disabled):hover {
    background: #ffca28;
}

.controls-hint {
    margin-top: 30px;
    font-size: 14px;
    color: #666;
    border: 1px solid #333;
    padding: 15px;
    border-radius: 8px;
    background: rgba(0,0,0,0.5);
    text-align: center;
    max-width: 700px;
}

.key {
    display: inline-block;
    background: #333;
    color: #fff;
    padding: 2px 6px;
    border-radius: 4px;
    margin: 0 2px;
    font-family: monospace;
    border-bottom: 2px solid #111;
}

.item-legend {
    margin-top: 15px;
    display: flex;
    gap: 20px;
    justify-content: center;
    font-size: 12px;
    flex-wrap: wrap;
}
.legend-item { display: flex; align-items: center; gap: 5px; }
.dot { width: 10px; height: 10px; display: inline-block; border-radius: 50%; }