/* --- Foundational & Root Styles --- */
:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111115;
    --glass-bg: rgba(26, 26, 32, 0.7);
    --glass-border: rgba(255, 255, 255, 0.12);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --gradient-primary: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-cyan) 100%);
    --radius-xl: 20px;
    --radius-lg: 16px;
    --radius-md: 12px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 1rem;
    position: relative;
    overflow-x: hidden;
    cursor: default;
}

/* --- Brush Cursor --- */
.brush-cursor {
    position: absolute;
    border: 2px dashed white;
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    transform: translate(0, 0);
    mix-blend-mode: difference;
    opacity: 0;
    transition: width 0.1s, height 0.1s, opacity 0.2s;
}

/* --- Background Decorations --- */
.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(circle at 15% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 85% 75%, rgba(6, 182, 212, 0.15) 0%, transparent 40%);
}

/* --- Main Layout & Card Styles --- */
.app-container {
    width: 100%;
    max-width: 900px;
    margin: 1.5rem auto 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 2rem;
    transition: all 0.3s ease;
}

.glass-card h2 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.glass-card p {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hidden {
    display: none !important;
}

/* --- Header --- */
.site-header {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.site-header .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    flex-grow: 1;
    text-align: center;
}

@media (min-width: 480px) {
    .site-header .logo {
        text-align: left;
    }
}

/* --- Buttons & Controls --- */
.centered-content { text-align: center; }

.action-btn {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--text-primary);
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.8rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
    font-size: 1rem;
}

.action-btn.small-btn {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
}

.action-btn:hover { transform: scale(1.05); }
.action-btn:disabled { background: var(--text-muted); cursor: not-allowed; transform: none; }

.status-message {
    color: var(--text-secondary);
    margin-top: 1rem;
    min-height: 1.2em;
}

.canvas-container {
    width: 100%;
    margin: 1rem 0;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    position: relative; 
}

canvas {
    display: block;
    width: 100%;
    height: auto;
    cursor: crosshair;
}

.controls-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1rem;
    background: rgba(0,0,0,0.1);
    border-radius: var(--radius-lg);
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

select {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    text-align: center;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    cursor: pointer;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 150px;
    height: 4px;
    background: var(--glass-border);
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: 2px solid white;
}

/* Color Picker Styling */
input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}
input[type="color"]::-webkit-color-swatch {
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 0.2rem;
}

.reset-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 2px 6px;
    transition: all 0.2s ease;
    line-height: 1;
    border-radius: 4px;
}

.reset-btn:hover {
    color: var(--accent-cyan);
    background: rgba(255,255,255,0.05);
    transform: rotate(-90deg);
}

.tool-select {
    display: flex;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.tool-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.tool-btn.active {
    background-color: var(--accent-purple);
    color: white;
}

.tool-btn:not(.active):hover {
    background-color: var(--bg-secondary);
}

.final-export { margin-top: 1.5rem; }

/* --- Preview Section Styles --- */
.preview-container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: flex-start;
}
.preview-box {
    flex: 1;
    min-width: 250px;
    text-align: center;
}
.preview-box h3 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 600;
}
.preview-box .canvas-container {
    margin-top: 0;
}
.preview-box .action-btn {
    margin-top: 1rem;
}

/* Toggle Switch Style */
.toggle-switch { display: inline-flex; align-items: center; gap: 0.75rem; cursor: pointer; font-weight: 600; color: var(--text-secondary); }
.toggle-switch input[type="checkbox"] { display: none; }
.toggle-switch .toggle-knob { position: relative; width: 44px; height: 24px; background-color: var(--bg-secondary); border: 1px solid var(--glass-border); border-radius: 12px; transition: background-color 0.3s ease; }
.toggle-switch .toggle-knob::before { content: ''; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; background-color: var(--text-secondary); border-radius: 50%; transition: transform 0.3s ease, background-color 0.3s ease; }
.toggle-switch input[type="checkbox"]:checked + .toggle-knob { background-color: var(--accent-cyan); }
.toggle-switch input[type="checkbox"]:checked + .toggle-knob::before { transform: translateX(20px); background-color: white; }

/* --- New Button Groups --- */
.btn-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}
.btn-group-vertical {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
}

/* --- Responsive Styles --- */
@media (max-width: 768px) {
    body { padding: 0.5rem; }
    .app-container { gap: 1rem; }
    .glass-card { padding: 1.5rem; }
    .controls-bar { flex-direction: column; gap: 1rem; }
}

/* --- Editor Layout (Side-by-Side) --- */
.app-container:has(.editor-layout) {
    max-width: 1400px;
}

.editor-layout {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.editor-sidebar {
    flex: 0 0 350px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scrollbar-width: thin;
    scrollbar-color: var(--glass-border) transparent;
}

.editor-sidebar::-webkit-scrollbar {
    width: 6px;
}
.editor-sidebar::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 3px;
}

.editor-workspace {
    flex: 1;
    min-width: 0;
}

.editor-sidebar .controls-bar {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    padding: 1.25rem;
    background: rgba(0, 0, 0, 0.2);
}

.editor-sidebar .control-group {
    align-items: flex-start;
    width: 100%;
}

.editor-sidebar .control-group input[type="range"] {
    width: 100%;
}

.editor-sidebar h2 {
    text-align: left;
    margin-bottom: 0.5rem;
}

.editor-sidebar p {
    text-align: left;
    margin-left: 0;
    margin-right: 0;
    margin-bottom: 1rem;
}

.editor-sidebar .tool-select {
    width: 100%;
}

.editor-sidebar .tool-btn {
    flex: 1;
    text-align: center;
}

.editor-sidebar .toggle-switch {
    justify-content: space-between;
    width: 100%;
    padding: 0.5rem 0;
}

.editor-sidebar .final-export {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.editor-sidebar .final-export .action-btn {
    width: 100%;
}

@media (max-width: 1100px) {
    .editor-layout {
        flex-direction: column-reverse;
        gap: 1.5rem;
    }
    
    .editor-sidebar {
        flex: none;
        width: 100%;
    }
    
    .editor-sidebar h2, .editor-sidebar p {
        text-align: center;
    }
    
    .editor-sidebar .controls-bar {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
    }
    
    .editor-sidebar .control-group {
        align-items: center;
        width: auto;
    }
    
    .editor-sidebar .control-group input[type="range"] {
        width: 150px;
    }

    .editor-sidebar .final-export {
        flex-direction: row;
        justify-content: center;
    }
    
    .editor-sidebar .final-export .action-btn {
        width: auto;
    }
}