:root{
    --bg1: #0f172a;
    --bg2: #16425b;
    --accent: #00d4ff;
    --panel: rgba(255,255,255,0.06);
    user-select: none;
}

@media (max-width: 360px) {
    body {
        font-size: 12px;
    }
}

@media (min-width: 361px) and (max-width: 720px) {
    body {
        font-size: 14px;
    }
}

@media (min-width: 721px) and (max-width: 1080px) {
    body {
        font-size: 16px;
    }
}

@media (min-width: 1081px) and (max-width: 1440px) {
    body {
        font-size: 18px;
    }
}

@media (min-width: 1441px) {
    body {
        font-size: 20px;
    }
}

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

html,body {
    height: 100%
}

body{
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    background: linear-gradient(180deg,var(--bg1),var(--bg2));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    user-select: none;
}

#game-root{
    width: 800px;
    height: 600px;
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 160px);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.6), 0 0 30px rgba(0,212,255,0.05) inset;
    background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
    position: relative;
    user-select: none;
}

.ui-top{
    position: absolute;
    top: 18px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    max-width: calc(100vw - 24px);
    left: 0;
    padding: 0 12px;
    z-index: 40;
    user-select: none;
}

#score{
    pointer-events: auto;
    background: var(--panel);
    padding: 8px 12px;
    border-radius: 8px;
    font-weight: 600;
    color: var(--accent);
    user-select: none;
}

.back-button{
    pointer-events: auto;
    margin-right: 12px;
    text-decoration: none;
    padding: 8px 12px;
    background: linear-gradient(90deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
    color: #fff;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.04);
    font-weight: 600;
    user-select: none;
}

.controls{
    width: 100%;
    max-width: 800px;
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 12px;
    pointer-events: auto;
    user-select: none;
}

.controls button{
    width: 88px;
    height: 56px;
    font-size: 28px;
    border-radius: 10px;
    border: none;
    background: rgba(255,255,255,0.06);
    color: #fff;
    cursor: pointer;
    user-select: none;
    touch-action: manipulation;
    transition: transform .08s ease, background-color .12s;
}

.controls button:active {
    transform: translateY(2px);
    background:
    rgba(255,255,255,0.12);
    user-select: none;
}

#overlay{
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    background: linear-gradient(180deg, rgba(2,6,23,0.6), rgba(2,6,23,0.4));
    flex-direction: column;
    user-select: none;
}

#overlay.hidden {
    display: none;
}

#overlay-message {
    background: rgba(255,255,255,0.03);
    padding: 18px 28px;
    border-radius: 12px;
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--accent);
    text-align: center;
    user-select: none;
}

#restart-btn {
    padding: 10px 18px;
    border-radius: 10px;
    border: none;
    background: var(--accent);
    color: #001;
    font-weight: 700;
    cursor: pointer;
    user-select: none;
}