/* Variables de Tema - Paleta Moderna y Oscura */
:root {
    --bg-color: #0f172a; /* Slate 900 */
    --canvas-bg: #0f172a;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc; /* Slate 50 */
    --text-secondary: #94a3b8; /* Slate 400 */
    --accent-color: #00ffcc; /* Cyan brillante/Neon */
    --accent-hover: #00e6b8;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden;
    min-height: 100vh;
    width: 100%;
    touch-action: none;
}

/* Overlay de Login */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}

.login-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.login-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    padding: 40px;
    border-radius: 24px;
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.login-card h2 {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.login-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 10px;
}

.google-btn {
    background-color: white;
    color: #3c4043;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: background-color 0.2s, box-shadow 0.2s;
}

.google-btn:hover {
    background-color: #f8f9fa;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* El Canvas */
.canvas-scroll {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

#drawing-canvas {
    background-color: var(--canvas-bg);
    cursor: crosshair;
    display: block;
    touch-action: none;
    width: 100vw;
    height: 100vh;
    z-index: 1;
}

#drawing-canvas.is-panning-mode {
    cursor: grab;
}

#drawing-canvas.is-panning-mode:active {
    cursor: grabbing;
}

.menu-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 20;
    width: 46px;
    height: 46px;
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    cursor: pointer;
    display: grid;
    place-items: center;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.35);
    transition: transform 0.2s, background-color 0.2s, border-color 0.2s;
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.menu-toggle[aria-expanded="true"] {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-12px);
}

.toolbar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 18;
    background: rgba(15, 23, 42, 0.35);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.toolbar-backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

/* UI Overlay - Menu lateral */
.toolbar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 19;
    width: min(320px, calc(100vw - 32px));
    height: 100vh;
    transform: translateX(-105%);

    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--glass-border);
    border-left: 0;
    border-radius: 0 18px 18px 0;
    padding: 22px;
    
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 22px;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 
                0 1px 3px rgba(255, 255, 255, 0.05) inset;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.toolbar.open {
    transform: translateX(0);
}

.toolbar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.icon-btn {
    width: 38px;
    height: 38px;
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    cursor: pointer;
    display: grid;
    place-items: center;
    transition: background-color 0.2s, border-color 0.2s;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-color);
}

.app-title {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
}

.tools-container {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
}

.tool-group {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
}

.tool-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.hidden-file-input {
    display: none;
}

.tool-hint {
    color: var(--text-secondary);
    font-size: 0.72rem;
    line-height: 1.35;
}

/* Color Picker Personalizado */
.color-wrapper {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--glass-border);
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.color-wrapper:hover {
    transform: scale(1.1);
    border-color: var(--accent-color);
}

input[type="color"] {
    width: 150%;
    height: 150%;
    margin: -25%;
    cursor: pointer;
    border: none;
    padding: 0;
}

/* Slider Personalizado */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    margin-top: -6px;
    box-shadow: 0 0 10px var(--accent-color);
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

/* Botones */
.tool-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.tool-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.tool-btn.active {
    background: rgba(0, 255, 204, 0.15);
    border-color: var(--accent-color);
    color: var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 255, 204, 0.2);
}

.segmented-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-btn.danger {
    padding: 8px;
    color: var(--danger-color);
}

.tool-btn.danger:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

/* Indicador de Estado */
.status-indicator {
    position: static;
    background: var(--bg-color);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-height: 28px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--danger-color); /* Desconectado por defecto */
}

.status-dot.connected {
    background-color: var(--success-color);
    box-shadow: 0 0 8px var(--success-color);
}

/* Responsive */
@media (max-width: 768px) {
    .toolbar {
        width: min(300px, calc(100vw - 24px));
        padding: 18px;
    }
    
    .tools-container {
        gap: 16px;
    }
    
    input[type="range"] {
        width: 100%;
    }
}