:root {
    --bg-color: #fdf6f9; 
    --sidebar-bg: #ffffff;
    --primary-pink: #ffafd3; 
    --dark-pink: #d47fa6;
    --soft-purple: #e7d1ff;
    --text-color: #5a5a5a; 
    --border-color: #f3e1ec;
    --shadow-soft: 0 4px 15px rgba(255, 175, 211, 0.15);
}

body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    gap: 25px;
    padding: 25px;
    background-color: var(--bg-color);
    background-image: linear-gradient(135deg, #fff5f9 0%, #f4f8ff 100%);
    height: 100vh;
    box-sizing: border-box;
    overflow: hidden;
    color: var(--text-color);
}

.toolbar {
    width: 340px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    flex-shrink: 0;
    overflow-y: auto;
    max-height: 100%;
    padding-right: 5px; 
}

.sidebar-pastel {
    background: var(--sidebar-bg);
    padding: 20px;
    border-radius: 25px;
    box-shadow: var(--shadow-soft);
    border: 1px solid white;
}

.app-title {
    text-align: center;
    color: var(--dark-pink);
    margin-bottom: 15px;
    font-weight: 500;
    letter-spacing: 1px;
}

.group {
    border: 1px solid var(--border-color);
    padding: 15px;
    border-radius: 18px;
    background: #fffbfc;
    transition: all 0.3s ease;
}

.group:hover {
    box-shadow: 0 2px 10px rgba(255, 230, 240, 0.5);
}

.group.no-border {
    border: none;
    background: transparent;
    padding: 0;
}

h3 {
    margin: 0 0 10px 0;
    font-size: 0.95rem;
    color: var(--dark-pink);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hint-text {
    font-size: 0.75rem;
    color: #999;
    margin-bottom: 10px;
    font-style: italic;
}


label {
    display: block;
    font-size: 0.85rem;
    margin-top: 5px;
    color: #777;
}

input[type="number"], input[type="text"], input[type="color"] {
    width: 100%;
    box-sizing: border-box;
    padding: 8px 12px;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #fff;
    color: var(--text-color);
    font-family: inherit;
    outline: none;
}
input:focus {
    border-color: var(--primary-pink);
}

input[type="file"] {
    display: none;
}

.custom-file-upload {
    border: 2px dashed var(--primary-pink);
    display: block;
    padding: 8px;
    text-align: center;
    border-radius: 12px;
    cursor: pointer;
    color: var(--dark-pink);
    background: #fff0f5;
    margin-bottom: 8px;
    font-weight: 500;
    transition: all 0.2s;
}
.custom-file-upload:hover {
    background: var(--primary-pink);
    color: white;
}


button {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    cursor: pointer;
    border: none;
    border-radius: 50px;
    font-weight: 500;
    font-family: inherit;
    transition: transform 0.1s, background-color 0.2s;
    font-size: 0.9rem;
}
button:active { transform: scale(0.98); }

.btn-primary {
    background-color: var(--primary-pink);
    color: white;
    box-shadow: 0 3px 10px rgba(255, 175, 211, 0.3);
}
.btn-primary:hover { background-color: var(--dark-pink); }

.btn-secondary {
    background-color: var(--soft-purple);
    color: #6a4c93;
}
.btn-secondary:hover { background-color: #d4b3ff; }

.btn-danger {
    background-color: #ffcccb;
    color: #d32f2f;
}
.btn-danger:hover { background-color: #ffb3b3; }

.btn-row { display: flex; gap: 8px; }

.effects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 10px;
}

.btn-effect {
    background-color: #f0f0f0;
    color: #555;
    font-size: 0.85rem;
    padding: 8px;
}
.btn-effect:hover { opacity: 0.9; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }

.canvas-container {
    flex-grow: 1;
    position: relative;
    border-radius: 25px;
    background-color: #ffffff; 
    box-shadow: var(--shadow-soft);
    display: flex;
    justify-content: center; 
    align-items: center;     
    overflow: hidden;        
    padding: 20px;
}

canvas {
    display: block;
    cursor: crosshair;
    background-color: white;
    
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    
    box-shadow: 0 0 20px rgba(212, 127, 166, 0.15);
}

#histograma {
    background: #fff;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    width: 100%;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.03);
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #fff0f5; border-radius: 10px; }
::-webkit-scrollbar-thumb { background: var(--primary-pink); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--dark-pink); }

.drop-active {
    border: 3px dashed var(--primary-pink) !important;
    background-color: rgba(255, 175, 211, 0.2) !important;
}