:root{
    --primary: #00f3ff;
    --danger: #ff0055;
    --warning: #ffaa00;
    --success: #00ff66;
    --bgdark: #050510;
    --bglight:#1a1a2e;
    --ui-font: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
body{
    margin: 0;
    padding: 0;
    background-color: var(--bgdark);
    color: white;
    height: 100vh;
    width: 100vw;
    font-family: var(--ui-font);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}
#game-container{
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 1200px;
    max-height: 900px;
    background-color: black;
    border: 2px solid var(--primary);
    overflow: hidden;
}
canvas{
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
}
.ui-screen{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 5, 16, 0.9);
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.ui-screen.visible{
    opacity: 1;
    pointer-events: all;
}
h1{
    font-size: 4rem;
    margin-bottom: 20px;
    color: var(--primary);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 10px;
}
h2{
    font-size: 2rem;
    color: white;
    margin-bottom: 40px;
    font-weight: 300;
}
.button{
    color: var(--primary);
    background: transparent;
    border: 2px solid var(--primary);
    margin: 10px;
    border-radius: 4px;
    font-size: 1.5rem;
    padding: 15px 50px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 2px;
}
.button:hover{
    background: var(--primary);
    color: black;
}
.hud-panel{
    position: absolute;
    padding: 20px;
    pointer-events: none;
    display: flex;
    gap: 20px;
}
.top-left{
    top: 0;
    left: 0;
}
.top-right{
    top: 0;
    right: 0;
    text-align: right;
}
.bottom-center{
    bottom: 20px;
    left: 50%;
    width: 60%;
    transform: translateX(-50%);
}
.stat-block{
    display: flex;
    flex-direction: column;
}
.stat-label{
    color: #888;
    font-size: 0.8rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.stat-value{
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}
.health-bar-container{
    width: 100%;
    height: 10px;
    background-color: #333;
    border-radius: 5px;
    margin-top: 5px;
    overflow: hidden;
}
.health-bar-fill{
    height: 100%;
    background-color: var(--danger);
    width: 100%;
    transition: width 0.2s ease;
}
.wave-text{
    font-size: 3rem;
    color: var(--warning);
    position: absolute;
    top: 30%;
    left: 50%;
    opacity: 0;
    transform: translate(-50%, -50%);
    pointer-events: none;
}
.wave-text.show{
    opacity: 1;
}
#shop-screen{
    background-color: rgba(5, 5, 16, 0.95);
}
.shop-grid{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 1000px;
    width: 100%;
    padding: 20px;
    text-align: center;
    transition: all 0.2s;
}
.shop-item:hover{
    border-color: var(--success);
    background: rgba(0, 255, 102, 0.05);
}
.shop-item h3{
    color: var(--success);
    margin: 0 0 10px 0;
}
.shop-item p{
    color: #ccc;
    font-size: 0.89rem;
    height: 40px;
}
.shop-cost{
    color: var(--warning);
    font-size: 1.2rem;
    margin: 15px 0;
    font-weight: bold;
}
.upgrade-btn{
    background: transparent;
    border: 1px solid var(--success);
    border-radius: 8px;
    padding: 20px;
    text-transform: uppercase;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}
.upgrade-btn:hover{
    background: var(--success);
    color: black;
}
.upgrade-btn:disabled{
    border-color: #444;
    color: #444;
    background: transparent;
    cursor: not-allowed;
}
.background-grid{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.32;
}
a{
    text-decoration: none;
    color: var(--primary);
}
.a{
    position: absolute;
    top: 20px;
    left: 20px;
}