/* --- Foundational 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, #8b5cf6 0%, #06b6d4 100%);
    --radius-xl: 20px;
    --radius-lg: 16px;
    --radius-md: 12px;
}

/* --- Global & Body Styles --- */
* {
    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;
    min-height: 100vh;
}

/* --- Background Decorations --- */
.background-overlay,
.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.background-overlay {
    background: radial-gradient(circle at 25% 25%, rgba(139, 92, 246, 0.1) 0%, transparent 50%), radial-gradient(circle at 75% 75%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.2;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background: var(--accent-purple);
    top: 10%;
    left: 10%;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-cyan);
    top: 50%;
    right: 5%;
}

/* --- Main Layout & Card Styles --- */
.app-container {
    width: 100%;
    max-width: 960px;
    margin: 1.5rem auto;
    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;
}

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

.glass-card .description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    max-width: 70ch;
}

/* --- Header --- */
.site-header {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.site-header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* --- Helper Classes --- */
.hidden {
    display: none !important;
}

/* --- Upload Area --- */
#upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 200px;
}

#upload-label:hover,
#upload-label.dragover {
    background: var(--accent-purple);
    border-color: transparent;
    color: var(--text-primary);
}

#upload-label.uploaded {
    border-style: solid;
    border-color: var(--accent-cyan);
    cursor: default;
}

#upload-label.uploaded:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-cyan);
}

#upload-prompt strong {
    display: block;
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

#image-preview {
    max-width: 120px;
    max-height: 120px;
    border-radius: var(--radius-md);
    object-fit: contain;
}

/* --- SVG Customization Section --- */
.svg-editor-layout {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.preview-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 0;
}

.preview-bg-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.preview-bg-controls span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.color-swatch {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--glass-border);
    transition: all 0.2s;
}

.color-swatch:hover {
    border-color: var(--text-secondary);
    transform: scale(1.1);
}

.color-swatch.active {
    border-color: var(--accent-cyan);
}

.color-swatch[data-color="transparent"] {
    background-image: linear-gradient(45deg, #444 25%, transparent 25%), linear-gradient(-45deg, #444 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #444 75%), linear-gradient(-45deg, transparent 75%, #444 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
}

/* --- Preview Grid & Swap --- */
.preview-grid {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    position: relative;
}

.preview-box {
    flex: 1;
}

.preview-box h4 {
    text-align: center;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 30px;
}

#swap-themes-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    transition: all 0.3s;
}

#swap-themes-btn:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    transform: rotate(180deg);
}

.svg-preview-wrapper {
    background-color: transparent;
    border-radius: var(--radius-lg);
    padding: 1rem;
    border: 1px solid var(--glass-border);
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.svg-preview-wrapper[data-bg="transparent"] {
    background-image: linear-gradient(45deg, var(--bg-secondary) 25%, transparent 25%), linear-gradient(-45deg, var(--bg-secondary) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, var(--bg-secondary) 75%), linear-gradient(-45deg, transparent 75%, var(--bg-secondary) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.svg-preview-wrapper svg {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* --- Controls --- */
.controls-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1rem;
}

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 1rem 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--glass-border);
}

.divider::before {
    margin-right: 1em;
}

.divider::after {
    margin-left: 1em;
}

.control-group {
    display: grid;
    grid-template-columns: 100px 1fr 40px;
    align-items: center;
    gap: 1rem;
}

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

.control-group span {
    font-family: 'SF Mono', monospace;
    color: var(--text-primary);
    background: var(--bg-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    text-align: center;
}

/* --- Custom Range Sliders --- */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--bg-secondary);
    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: 3px solid white;
    transition: transform 0.2s;
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: 3px solid white;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* --- Generate & Results Area --- */
.controls {
    text-align: center;
}

button {
    background: var(--gradient-primary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.8rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.4);
}

button:disabled {
    background: var(--bg-secondary);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    animation: none;
}

@keyframes pulse-purple {
    0% {
        box-shadow: 0 0 0 0 rgba(139, 92, 246, 0.7);
    }

    70% {
        box-shadow: 0 0 0 10px rgba(139, 92, 246, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(139, 92, 246, 0);
    }
}

.glow-animation {
    animation: pulse-purple 2s infinite;
    background: linear-gradient(135deg, #a78bfa 0%, #22d3ee 100%);
    /* Slightly brighter for attention */
}

.results-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

.result-box h3 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.code-block-wrapper {
    position: relative;
}

.code-block-wrapper pre {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    overflow-x: auto;
}

.code-block-wrapper code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-all;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.4rem;
    border-radius: 6px;
    line-height: 0;
}

.download-btn {
    width: 100%;
    justify-content: center;
}

.upload-actions {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.reset-btn {
    background: rgba(239, 68, 68, 0.15);
    color: #fca5a5;
    font-size: 0.9rem;
    padding: 0.6rem 1.2rem;
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
}

.reset-btn:hover {
    background: rgba(239, 68, 68, 0.25);
    border-color: rgba(239, 68, 68, 0.5);
    transform: translateY(-2px);
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .preview-grid {
        flex-direction: column;
    }

    .swap-container {
        padding: 10px 0;
        transform: rotate(90deg);
    }

    #swap-themes-btn:hover {
        transform: rotate(270deg);
    }

    /* adjust rotation for mobile */
    .svg-preview-wrapper {
        height: 200px;
        width: 100%;
    }

    .control-group {
        grid-template-columns: 80px 1fr 40px;
        gap: 0.75rem;
    }

    .results-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}


/* --- Padding Controls (Refined) --- */
.padding-preview-compact {
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.padding-preview-box {
    width: 256px;
    height: 256px;
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.preview-icon {
    width: 100%;
    height: 100%;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.preview-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* --- Toggle Switch --- */
.toggle-switch-wrapper {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

.toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--glass-bg);
    border: 1px solid var(--glass-border);
    transition: .4s;
    border-radius: 34px;
}

.toggle-label:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 3px;
    background-color: var(--text-muted);
    transition: .4s;
    border-radius: 50%;
}

.toggle-input:checked+.toggle-label {
    background: var(--gradient-primary);
    border-color: transparent;
}

.toggle-input:checked+.toggle-label:before {
    transform: translateX(22px);
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* --- Color Picker Customization --- */
input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    border-radius: 50%;
    overflow: hidden;
    padding: 0;
    cursor: pointer;
    background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

#overlay-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1rem;
}