* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #1a1a2e;
    touch-action: none;
    overscroll-behavior: none;
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    height: 100dvh;
}

#hud {
    position: fixed;
    top: max(10px, env(safe-area-inset-top));
    left: env(safe-area-inset-left);
    right: env(safe-area-inset-right);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 0 10px;
    pointer-events: none;
    font-family: 'Courier New', monospace;
    font-size: clamp(11px, 2.5vw, 14px);
    color: #ffffff;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
    z-index: 10;
}

#hud div {
    background: rgba(0, 0, 0, 0.5);
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

#mobileControls {
    display: none;
    position: fixed;
    bottom: max(16px, env(safe-area-inset-bottom));
    left: 16px;
    z-index: 20;
    pointer-events: none;
}

.d-pad {
    display: grid;
    grid-template-columns: 56px 56px 56px;
    grid-template-rows: 56px 56px 56px;
    grid-template-areas:
        ". up ."
        "left . right"
        ". down .";
    gap: 4px;
    pointer-events: auto;
}

.d-btn {
    width: 56px;
    height: 56px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.45);
    color: rgba(255, 255, 255, 0.8);
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    cursor: pointer;
    transition: background 0.1s;
}

.d-btn:active {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

#btnUp    { grid-area: up; }
#btnDown  { grid-area: down; }
#btnLeft  { grid-area: left; }
#btnRight { grid-area: right; }

@media (max-width: 768px), (hover: none) and (pointer: coarse) {
    #mobileControls {
        display: block;
    }

    #hud {
        font-size: clamp(10px, 3vw, 12px);
        top: max(6px, env(safe-area-inset-top));
    }

    #hud div {
        padding: 3px 6px;
    }
}

@media (max-width: 480px) {
    .d-pad {
        grid-template-columns: 48px 48px 48px;
        grid-template-rows: 48px 48px 48px;
        gap: 3px;
    }

    .d-btn {
        width: 48px;
        height: 48px;
        font-size: 16px;
        border-radius: 10px;
    }

    #mobileControls {
        bottom: max(8px, env(safe-area-inset-bottom));
        left: 8px;
    }
}

@media (orientation: landscape) and (max-height: 500px) {
    .d-pad {
        grid-template-columns: 44px 44px 44px;
        grid-template-rows: 44px 44px 44px;
        gap: 2px;
    }

    .d-btn {
        width: 44px;
        height: 44px;
        font-size: 14px;
    }

    #mobileControls {
        left: 4px;
        bottom: 4px;
    }
}

#joinScreen {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 100;
}

.join-box {
    background: #2a2a4e;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.join-box h2 {
    color: #fff;
    margin-bottom: 24px;
    font-family: 'Courier New', monospace;
}

.join-box input {
    display: block;
    width: 250px;
    padding: 12px;
    margin: 0 auto 16px;
    border: 2px solid #4a4a6e;
    border-radius: 8px;
    background: #1a1a2e;
    color: #fff;
    font-size: 16px;
    font-family: 'Courier New', monospace;
}

.join-box input:focus {
    outline: none;
    border-color: #4fc3f7;
}

.join-box button {
    padding: 12px 32px;
    background: #4fc3f7;
    color: #1a1a2e;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    transition: background 0.2s;
}

.join-box button:hover {
    background: #81d4fa;
}

#chatContainer {
    display: none;
    position: fixed;
    bottom: max(80px, env(safe-area-inset-bottom));
    right: env(safe-area-inset-right);
    width: 300px;
    max-height: 400px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 8px;
    flex-direction: column;
    z-index: 30;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

#chatMessages {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

.chat-line {
    margin-bottom: 4px;
    word-wrap: break-word;
}

.chat-line .nickname {
    font-weight: bold;
}

.chat-line .message {
    color: #ddd;
}

#chatInput {
    flex-shrink: 0;
    width: calc(100% - 70px);
    padding: 8px;
    border: none;
    background: #2a2a4e;
    color: #fff;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

#chatInput:focus {
    outline: none;
}

#sendBtn {
    flex-shrink: 0;
    width: 60px;
    padding: 8px;
    background: #4fc3f7;
    color: #1a1a2e;
    border: none;
    font-weight: bold;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

#sendBtn:hover {
    background: #81d4fa;
}

@media (prefers-reduced-motion: reduce) {
    .d-btn {
        transition: none;
    }
}