@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;700&display=swap');

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #060614;
    overflow: hidden;
    font-family: 'Outfit', sans-serif;
    color: white;
    user-select: none;
}

canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    cursor: crosshair;
}

#ui-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
}

#scoreBoard {
    position: absolute;
    top: 25px;
    left: 30px;
    font-size: 26px;
    font-weight: bold;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.8);
    pointer-events: auto;
    letter-spacing: 1.5px;
    z-index: 10;
}

.destroyed-board {
    font-size: 20px;
    margin-top: 8px;
    color: #ff758c;
    text-shadow: 0 0 15px rgba(255, 117, 140, 0.8);
}

/* Căn giữa 100% màn hình với position: fixed */
.overlay {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1);
    background: rgba(15, 15, 35, 0.78);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 40px 50px;
    border-radius: 28px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    text-align: center;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.7), inset 0 0 0 1px rgba(255, 255, 255, 0.12);
    pointer-events: auto;
    transition: opacity 0.35s ease, transform 0.35s ease, visibility 0.35s ease;
    opacity: 1;
    visibility: visible;
    max-width: 90vw;
    width: 500px;
    box-sizing: border-box;
    z-index: 100;
}

.overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(-50%, -50%) scale(0.92);
}

.overlay h1 {
    font-size: 46px;
    margin: 0 0 15px 0;
    background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #c084fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0px 0px 15px rgba(79, 172, 254, 0.6));
    letter-spacing: 2px;
}

.overlay h1.text-danger {
    background: linear-gradient(135deg, #ff0844 0%, #ff758c 50%, #ffb199 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0px 0px 15px rgba(255, 8, 68, 0.6));
}

.overlay p {
    font-size: 17px;
    color: #e2e8f0;
    margin-bottom: 25px;
    line-height: 1.6;
}

#gameOverScreen p {
    margin-bottom: 12px;
    font-size: 19px;
}

#gameOverScreen p:last-of-type {
    margin-bottom: 28px;
}

.legend {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 15px;
    color: #cbd5e1;
    background: rgba(255, 255, 255, 0.05);
    padding: 6px 12px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

button {
    background: linear-gradient(45deg, #00f2fe 0%, #4facfe 100%);
    border: none;
    padding: 16px 45px;
    font-size: 18px;
    font-weight: bold;
    color: white;
    border-radius: 40px;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0, 242, 254, 0.4);
    transition: all 0.25s ease;
    font-family: inherit;
    letter-spacing: 1px;
}

#restartBtn {
    background: linear-gradient(45deg, #ff0844 0%, #ffb199 100%);
    box-shadow: 0 10px 25px rgba(255, 8, 68, 0.4);
}

button:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 15px 30px rgba(0, 242, 254, 0.6);
}

#restartBtn:hover {
    box-shadow: 0 15px 30px rgba(255, 8, 68, 0.6);
}

button:active {
    transform: translateY(1px) scale(0.98);
}