:root {
    --bg-deep: #07070d;
    --bg-surface: #0e0e1a;
    --bg-elevated: rgba(255, 255, 255, .04);
    --glass-bg: rgba(10, 10, 14, .45);
    --glass-border: rgba(255, 255, 255, .07);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, .35);
    --text-primary: #e8e8f0;
    --text-secondary: rgba(255, 255, 255, .5);
    --text-muted: rgba(255, 255, 255, .28);
    --accent-cyan: #00f0ff;
    --accent-magenta: #ff00e5;
    --accent-lime: #39ff14;
    --accent-blue: #4d6dff;
    --accent-pink: #ff2d6b;
    --accent-gold: #ffd700;
    --accent-purple: #b400ff;
    --font-primary: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: "Outfit", "Inter", sans-serif;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 999px;
    --transition-fast: .15s cubic-bezier(.4, 0, .2, 1);
    --transition-smooth: .3s cubic-bezier(.4, 0, .2, 1);
    --transition-bounce: .4s cubic-bezier(.34, 1.56, .64, 1)
}

*,
*:before,
*:after {
    margin: 0;
    padding: 0;
    box-sizing: border-box
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-deep);
    font-family: var(--font-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale
}

.hidden {
    display: none !important
}

#loading-screen {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-deep);
    transition: opacity .8s ease, visibility .8s ease
}

#loading-screen.fade-out {
    opacity: 0;
    visibility: hidden
}

.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px
}

.loader-logo {
    width: 160px;
    height: auto;
    opacity: .9;
    filter: drop-shadow(0 0 12px rgba(255, 255, 255, .06));
    animation: logo-breathe 3s ease-in-out infinite
}

@keyframes logo-breathe {

    0%,
    to {
        opacity: .85
    }

    50% {
        opacity: 1
    }
}

.loader-subtitle {
    color: #ffffff4d;
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 1px;
    text-transform: uppercase
}

.loader-bar {
    width: 140px;
    height: 1.5px;
    background: #ffffff0f;
    border-radius: var(--radius-full);
    overflow: hidden
}

.loader-bar-fill {
    height: 100%;
    width: 0%;
    background: #fff6;
    border-radius: var(--radius-full);
    animation: loader-progress 3s ease-in-out forwards
}

@keyframes loader-progress {
    0% {
        width: 0%
    }

    30% {
        width: 40%
    }

    60% {
        width: 65%
    }

    85% {
        width: 80%
    }

    to {
        width: 95%
    }
}

#app {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: var(--bg-deep)
}

#webcam {
    display: none
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%
}

#camera-canvas {
    z-index: 1
}

#drawing-canvas {
    z-index: 2
}

#ui-canvas {
    z-index: 3;
    pointer-events: none
}

#gesture-hud {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translate(-50%);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 22px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    box-shadow: var(--glass-shadow);
    transition: var(--transition-smooth);
    -webkit-user-select: none;
    user-select: none
}

#gesture-icon {
    font-size: 22px;
    line-height: 1;
    transition: var(--transition-bounce)
}

#gesture-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: .5px;
    text-transform: uppercase
}

#gesture-hud.drawing,
#gesture-hud.erasing,
#gesture-hud.grabbing {
    border-color: #ffffff4d;
    box-shadow: 0 4px 30px #ffffff26
}

#toolbar {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 18px 14px;
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    transition: var(--transition-smooth)
}

#toolbar:hover {
    border-color: #ffffff1f
}

.toolbar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px
}

.toolbar-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted)
}

.toolbar-divider {
    width: 36px;
    height: 1px;
    background: var(--glass-border)
}

#color-palette {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px
}

.color-swatch {
    width: 26px;
    height: 26px;
    border-radius: var(--radius-full);
    border: none;
    background: radial-gradient(circle at 35% 35%, color-mix(in srgb, var(--swatch-color) 100%, white 40%) 0%, var(--swatch-color) 50%, color-mix(in srgb, var(--swatch-color) 100%, black 30%) 100%);
    cursor: pointer;
    transition: all .2s cubic-bezier(.4, 0, .2, 1);
    position: relative;
    outline: none;
    box-shadow: 0 1px 3px #0006, inset 0 1px 1px #ffffff40
}

.color-swatch:before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    border-radius: var(--radius-full);
    background: radial-gradient(circle at 30% 25%, rgba(255, 255, 255, .35) 0%, transparent 55%);
    pointer-events: none
}

.color-swatch:hover {
    transform: scale(1.2);
    box-shadow: 0 0 12px color-mix(in srgb, var(--swatch-color) 50%, transparent), 0 2px 6px #0000004d, inset 0 1px 1px #ffffff40
}

.color-swatch.active {
    transform: scale(1.12);
    box-shadow: 0 0 16px color-mix(in srgb, var(--swatch-color) 55%, transparent), 0 2px 8px #0000004d, inset 0 1px 1px #fff3
}

.color-swatch.active:after {
    content: "";
    position: absolute;
    top: -4px;
    right: -4px;
    bottom: -4px;
    left: -4px;
    border-radius: var(--radius-full);
    border: 1.5px solid rgba(255, 255, 255, .35);
    animation: swatch-ring 2s ease-in-out infinite
}

@keyframes swatch-ring {

    0%,
    to {
        opacity: .25;
        transform: scale(1)
    }

    50% {
        opacity: .5;
        transform: scale(1.06)
    }
}

input[type=range] {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 100px;
    height: 4px;
    background: #ffffff14;
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    transform: rotate(-90deg);
    margin: 30px 0
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    background: #ffffffd9;
    border: 2px solid var(--bg-deep);
    box-shadow: 0 0 8px #ffffff26;
    cursor: pointer;
    transition: var(--transition-fast)
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 12px #ffffff40
}

input[type=range]::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: var(--radius-full);
    background: #ffffffd9;
    border: 2px solid var(--bg-deep);
    box-shadow: 0 0 8px #ffffff26;
    cursor: pointer
}

.slider-value {
    font-size: 10px;
    color: var(--text-muted);
    font-weight: 500;
    font-variant-numeric: tabular-nums
}

.toolbar-actions {
    display: flex;
    flex-direction: column;
    gap: 6px
}

.toolbar-btn {
    width: 38px;
    height: 38px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    outline: none
}

.toolbar-btn:hover {
    background: #ffffff0f;
    color: var(--text-primary);
    border-color: #ffffff26;
    transform: scale(1.05)
}

.toolbar-btn.active {
    background: #ffffff14;
    color: #ffffffe6;
    border-color: #fff3
}

.toolbar-btn svg {
    width: 18px;
    height: 18px
}

#camera-mode-indicator {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 100;
    padding: 6px 14px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: .5px;
    transition: var(--transition-smooth);
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none
}

#camera-mode-indicator:hover {
    border-color: #ffffff26
}

#camera-mode-indicator.dark-mode {
    color: var(--accent-purple);
    border-color: #b400ff33
}

#onboarding-modal {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #07070d99;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: opacity .5s ease, visibility .5s ease
}

#onboarding-modal.hidden {
    opacity: 0;
    visibility: hidden
}

.onboarding-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 90%;
    max-width: 440px;
    text-align: center;
    box-shadow: 0 20px 60px #00000080, inset 0 1px 1px #ffffff1a;
    transform: translateY(0);
    transition: transform .5s cubic-bezier(.16, 1, .3, 1)
}

#onboarding-modal.hidden .onboarding-content {
    transform: translateY(20px)
}

.onboarding-logo {
    height: 60px;
    margin-bottom: 24px;
    opacity: .9
}

.onboarding-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 30px;
    letter-spacing: -.5px
}

.onboarding-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
    text-align: left
}

.onboarding-item {
    display: flex;
    align-items: flex-start;
    gap: 14px
}

.onboarding-icon {
    font-size: 24px;
    background: #ffffff0d;
    border: 1px solid rgba(255, 255, 255, .1);
    border-radius: var(--radius-md);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center
}

.onboarding-text {
    display: flex;
    flex-direction: column;
    gap: 4px
}

.onboarding-text strong {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 600
}

.onboarding-text span {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4
}

.btn-primary {
    background: #ffffffe6;
    color: #000;
    border: none;
    border-radius: var(--radius-full);
    padding: 14px 40px;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all .2s ease;
    box-shadow: 0 4px 14px #fff3
}

.btn-primary:hover {
    background: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px #ffffff4d
}

.btn-primary:active {
    transform: translateY(0)
}

@keyframes fade-in {
    0% {
        opacity: 0
    }

    to {
        opacity: 1
    }
}

#app:not(.hidden) {
    animation: fade-in .5s ease-out
}

input[type=range]:active::-webkit-slider-thumb {
    transform: scale(1.3)
}

*:focus-visible {
    outline: 2px solid rgba(255, 255, 255, .8);
    outline-offset: 2px
}

@media (max-width: 768px) {
    #toolbar {
        right: 10px;
        padding: 12px 10px;
        gap: 8px
    }

    .color-swatch {
        width: 24px;
        height: 24px
    }

    input[type=range] {
        width: 80px;
        margin: 25px 0
    }

    .toolbar-btn {
        width: 32px;
        height: 32px
    }

    #gesture-hud {
        bottom: 16px;
        padding: 8px 16px
    }
}