* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: #10101b;
    color: #fff;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.hidden {
    display: none !important;
}

/* Glassmorphism Panel */
.glass-panel {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    border-radius: 16px;
}

/* Lobby Screen */
#lobby-screen {
    padding: 40px;
    text-align: center;
    width: 100%;
    max-width: 400px;
}

#lobby-screen h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.animated-gradient-text {
    background: linear-gradient(90deg, #ff6b6b, #8b0000);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: shineRed 2s ease-in-out infinite alternate;
}

@keyframes shineRed {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: 100% center;
    }
}

#lobby-screen p {
    color: #a0a0b0;
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group input {
    padding: 15px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(0,0,0,0.2);
    color: #fff;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.input-group input:focus {
    border-color: #5ac8fa;
    box-shadow: 0 0 10px rgba(90, 200, 250, 0.3);
}

.input-group button {
    padding: 15px;
    border-radius: 8px;
    border: none;
    background: linear-gradient(135deg, #007aff, #5856d6);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.input-group button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 122, 255, 0.4);
}

/* Drawing Screen */
#drawing-screen {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 20px;
}

/* Toolbar */
.toolbar {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    gap: 15px;
    flex-wrap: wrap;
    z-index: 10;
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-btn {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.05);
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tool-btn:hover {
    background: rgba(255,255,255,0.15);
}

.tool-btn.active {
    background: #007aff;
    border-color: #007aff;
}

.glass-select {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.05);
    color: #fff;
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
}

.glass-select option {
    background: #1e1e2f;
    color: #fff;
}

.divider {
    width: 1px;
    height: 30px;
    background: rgba(255,255,255,0.2);
}

.color-picker {
    width: 25px;
    height: 25px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.2s ease;
}

.color-picker:hover {
    transform: scale(1.2);
}

.color-picker.active {
    border-color: #fff;
    box-shadow: 0 0 8px rgba(255,255,255,0.5);
}

#custom-color {
    width: 30px;
    height: 30px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background: transparent;
}

.size-group {
    color: #a0a0b0;
}

#brush-size {
    cursor: pointer;
    accent-color: #007aff;
}

.danger-btn {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid rgba(255, 59, 48, 0.3);
    background: rgba(255, 59, 48, 0.1);
    color: #ff3b30;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.danger-btn:hover {
    background: #ff3b30;
    color: #fff;
}

.room-info {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 15px;
    background: rgba(0,0,0,0.2);
    padding: 8px 15px;
    border-radius: 5px;
}

/* Zoom Slider UI */
.zoom-slider-wrapper {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    padding: 15px 10px;
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    z-index: 1000;
}
.zoom-slider-wrapper i {
    color: rgba(0,0,0,0.5);
}
.slider-track {
    height: 150px;
    width: 20px;
    position: relative;
}
#zoom-slider {
    position: absolute;
    width: 150px;
    left: 10px;
    top: 150px;
    transform: rotate(-90deg);
    transform-origin: left center;
    cursor: pointer;
    background: transparent;
}

#leave-btn {
    background: transparent;
    border: none;
    color: #ff3b30;
    font-size: 1.1rem;
    cursor: pointer;
}

/* Canvas Area */
.canvas-container {
    flex: 1;
    border-radius: 16px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    background: #ffffff;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
    touch-action: none;
}

.users-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.05);
    padding: 10px 15px;
    border-radius: 8px;
    color: rgba(0, 0, 0, 0.3);
    font-size: 0.9rem;
    pointer-events: none;
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.users-overlay span {
    font-weight: 600;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .toolbar {
        padding: 10px;
        gap: 8px;
        justify-content: center;
    }
    
    .tool-btn, .danger-btn {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .glass-select {
        padding: 5px 8px;
        font-size: 0.8rem;
    }
    
    .color-picker {
        width: 20px;
        height: 20px;
    }
    
    #custom-color {
        width: 25px;
        height: 25px;
    }
    
    .room-info {
        width: 100%;
        justify-content: space-between;
        margin-top: 5px;
        margin-left: 0;
    }
    
    #drawing-screen {
        padding: 10px;
        gap: 10px;
    }
}

/* T Logo */
#t-logo {
    position: fixed;
    bottom: 20px;
    left: 20px;
    font-size: 2.5rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.15);
    cursor: default;
    transition: all 0.4s ease;
    z-index: 9999;
    user-select: none;
    font-family: 'Inter', sans-serif;
}

#t-logo:hover {
    color: rgba(255, 255, 255, 1);
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.8), 0 0 30px rgba(90, 200, 250, 0.8), 0 0 45px rgba(0, 122, 255, 0.6);
    transform: scale(1.1) translateY(-2px);
}