/* =========================================
   GIAO DIỆN SOFT NEO-BRUTALISM (PASTEL)
========================================= */

:root {
    --border-soft: 2px solid #2d3142;
    --shadow-soft: 4px 4px 0px rgba(45, 49, 66, 0.8);
    --shadow-soft-hover: 2px 2px 0px rgba(45, 49, 66, 0.8);
    
    --clr-bg: #faf9f6;        
    --clr-surface: #ffffff;   
    --clr-primary: #8fb8ed;   /* Xanh dương nhạt */
    --clr-secondary: #f2cc8f; /* Vàng nhạt */
    --clr-pink: #f4acb7;      /* Hồng nhạt */
    --clr-success: #81b29a;   /* Xanh lá nhạt */
    --clr-text: #2d3142;      
}

.filter-soft-wrapper {
    max-width: 900px;
    margin: 0 auto;
    font-family: system-ui, -apple-system, sans-serif;
    color: var(--clr-text);
    background: var(--clr-bg);
    padding: 25px;
    border: var(--border-soft);
    border-radius: 16px;
    box-shadow: var(--shadow-soft);
}

.filter-soft-wrapper * { box-sizing: border-box; }

/* Header */
.filter-soft-header {
    background: var(--clr-surface);
    padding: 20px;
    border: var(--border-soft);
    border-radius: 12px;
    text-align: center;
    margin-bottom: 25px;
    box-shadow: var(--shadow-soft);
}
.filter-soft-header h2 { margin: 0 0 8px 0; font-size: 1.8rem; font-weight: 800; }
.filter-soft-header p { margin: 0; font-weight: 500; font-size: 1rem; color: #555;}

/* Upload Area */
.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    background: var(--clr-pink);
    padding: 50px 20px;
    border: 2px dashed var(--clr-text);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.upload-label:hover {
    background: #ea9ab2;
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
    border-style: solid;
}
.upload-icon { font-size: 3.5rem; }
.upload-text { font-size: 1.15rem; font-weight: 700; }

/* Editor & Canvas Area */
.editor-section { display: flex; flex-direction: column; gap: 20px; }

.canvas-container {
    width: 100%;
    max-height: 480px;
    background: #e9ecef;
    border: var(--border-soft);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    box-shadow: inset 2px 2px 5px rgba(0,0,0,0.08);
    overflow: hidden;
}

#filter-canvas {
    max-width: 100%;
    max-height: 450px;
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    object-fit: contain;
}

/* Control Grid */
.filter-controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.control-box {
    background: var(--clr-surface);
    border: var(--border-soft);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow-soft);
}
.box-title { margin: 0 0 15px 0; font-size: 1rem; font-weight: 800; text-transform: uppercase; border-bottom: 2px dashed #eee; padding-bottom: 8px;}

/* Presets Buttons */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.preset-btn {
    padding: 10px;
    font-weight: 700;
    font-size: 0.9rem;
    background: var(--clr-bg);
    color: var(--clr-text);
    border: var(--border-soft);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
}
.preset-btn:hover { background: #eee; transform: translateY(-2px); box-shadow: 2px 2px 0px rgba(45, 49, 66, 0.5); }
.preset-btn.active { background: var(--clr-text); color: var(--clr-surface); }

/* Sliders */
.sliders-list { display: flex; flex-direction: column; gap: 12px; }
.slider-group { display: flex; flex-direction: column; gap: 4px; }
.slider-label { display: flex; justify-content: space-between; font-weight: 700; font-size: 0.85rem; }

/* Custom Slider Style Neo Soft */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}
input[type=range]:focus { outline: none; }
input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 10px;
    cursor: pointer;
    background: var(--clr-bg);
    border-radius: 5px;
    border: 1.5px solid var(--clr-text);
}
input[type=range]::-webkit-slider-thumb {
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: var(--clr-primary);
    border: 1.5px solid var(--clr-text);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 2px 2px 0px rgba(0,0,0,0.2);
}

/* Action Bar */
.action-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.action-btn {
    padding: 14px 18px;
    font-size: 0.95rem;
    font-weight: 700;
    background: var(--clr-surface);
    color: var(--clr-text);
    border: var(--border-soft);
    border-radius: 10px;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: all 0.15s ease;
}
.action-btn:hover { transform: translateY(-2px); }
.action-btn:active { transform: translate(2px, 2px); box-shadow: var(--shadow-soft-hover); }

.btn-compare { background: var(--clr-secondary); }
.btn-change { background: var(--clr-pink); }

.btn-primary-soft {
    flex: 1;
    min-width: 200px;
    padding: 14px 20px;
    font-size: 1.05rem;
    font-weight: 800;
    background: var(--clr-success);
    color: var(--clr-text);
    border: var(--border-soft);
    border-radius: 10px;
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    text-transform: uppercase;
    text-align: center;
    text-decoration: none;
    transition: all 0.15s ease;
}
.btn-primary-soft:active { transform: translate(2px, 2px); box-shadow: var(--shadow-soft-hover); }

@media (max-width: 700px) {
    .filter-controls-grid { grid-template-columns: 1fr; }
    .action-bar { flex-direction: column; align-items: stretch; }
    .btn-primary-soft { text-align: center; }
}