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

:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #0f0f2a;
    --bg-card: #12122a;
    --bg-hover: #1a1a3e;
    --neon-cyan: #00fff7;
    --neon-magenta: #ff00ff;
    --neon-pink: #ff006e;
    --neon-green: #00ff41;
    --neon-yellow: #ffb703;
    --neon-blue: #0088ff;
    --neon-orange: #ff6600;
    --text-primary: #e0e0ff;
    --text-secondary: #8888cc;
    --border-color: #2a2a5a;
    --glow-cyan: 0 0 10px rgba(0, 255, 247, 0.3), 0 0 20px rgba(0, 255, 247, 0.1);
    --glow-magenta: 0 0 10px rgba(255, 0, 255, 0.3), 0 0 20px rgba(255, 0, 255, 0.1);
    --glow-pink: 0 0 10px rgba(255, 0, 110, 0.3), 0 0 20px rgba(255, 0, 110, 0.1);
    --glow-green: 0 0 10px rgba(0, 255, 65, 0.3), 0 0 20px rgba(0, 255, 65, 0.1);
}

[data-theme="light"] {
    --bg-primary: #f0f0f5;
    --bg-secondary: #e8e8f0;
    --bg-card: #ffffff;
    --bg-hover: #e0e0f0;
    --neon-cyan: #5fa8d3;
    --neon-magenta: #c77dff;
    --neon-pink: #ff8fab;
    --neon-green: #7ec8a0;
    --neon-yellow: #e9c46a;
    --neon-blue: #7bb3e0;
    --neon-orange: #f4a261;
    --text-primary: #000000;
    --text-secondary: #333366;
    --border-color: #c8c8d8;
    --glow-cyan: 0 0 10px rgba(95, 168, 211, 0.15), 0 0 20px rgba(95, 168, 211, 0.05);
    --glow-magenta: 0 0 10px rgba(199, 125, 255, 0.15), 0 0 20px rgba(199, 125, 255, 0.05);
    --glow-pink: 0 0 10px rgba(255, 143, 171, 0.15), 0 0 20px rgba(255, 143, 171, 0.05);
    --glow-green: 0 0 10px rgba(126, 200, 160, 0.15), 0 0 20px rgba(126, 200, 160, 0.05);
}

[data-theme="light"] body {
    background-image: none;
}

[data-theme="light"] body::after {
    display: none;
}

body {
    font-family: Calibri, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    background-image:
        linear-gradient(rgba(0, 255, 247, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 247, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 255, 247, 0.008) 2px,
        rgba(0, 255, 247, 0.008) 4px
    );
    pointer-events: none;
    z-index: 9998;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    padding: 3rem 0;
    position: relative;
}

.theme-toggle {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: transparent;
    border: 2px solid var(--neon-cyan);
    border-radius: 20px;
    padding: 0.3rem 1rem;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    color: var(--neon-cyan);
    box-shadow: 0 0 8px rgba(0, 255, 247, 0.2), inset 0 0 8px rgba(0, 255, 247, 0.05);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    box-shadow: 0 0 16px rgba(0, 255, 247, 0.4), inset 0 0 12px rgba(0, 255, 247, 0.1);
    transform: scale(1.05);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 3px;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta), var(--neon-pink));
    border-radius: 2px;
    box-shadow: var(--glow-cyan), 0 0 40px var(--neon-magenta);
    animation: shimmer 2s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) scaleX(1); }
    50% { opacity: 1; transform: translateX(-50%) scaleX(1.2); }
}

h1 {
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-magenta), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    animation: fadeInDown 0.8s ease;
    text-shadow: none;
    filter: drop-shadow(0 0 20px rgba(0, 255, 247, 0.2));
}

[data-theme="light"] h1 {
    background: none;
    -webkit-background-clip: unset;
    background-clip: unset;
    -webkit-text-fill-color: #0055ff;
    color: #0055ff;
    filter: none;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    animation: fadeIn 1s ease 0.3s both;
    text-shadow: 0 0 10px rgba(0, 255, 247, 0.2);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    background: transparent;
    backdrop-filter: blur(10px);
    animation: slideUp 0.8s ease 0.4s both;
    box-shadow: 0 0 15px rgba(0, 255, 247, 0.05);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab {
    flex: 1;
    padding: 1.2rem 2rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s ease;
    position: relative;
}

.tab:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background: var(--border-color);
}

.tab:hover {
    color: var(--neon-cyan);
    background: rgba(0, 255, 247, 0.05);
    text-shadow: 0 0 10px var(--neon-cyan);
}

.tab.active {
    color: var(--bg-primary);
    background: linear-gradient(135deg, var(--neon-magenta), var(--neon-pink));
    box-shadow: var(--glow-magenta);
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.tab-content {
    display: none;
    animation: fadeInContent 0.5s ease;
}

@keyframes fadeInContent {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content.active {
    display: block;
}

.workspace {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.sidebar {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    height: fit-content;
    box-shadow: 0 0 15px rgba(0, 255, 247, 0.03);
}

.sidebar:hover {
    border-color: rgba(0, 255, 247, 0.2);
    box-shadow: var(--glow-cyan);
    transition: all 0.4s ease;
}

.sidebar-section {
    margin-bottom: 2rem;
}

.sidebar-section h3 {
    color: var(--neon-cyan);
    font-size: 1rem;
    margin-bottom: 1rem;
    font-family: Calibri, 'Segoe UI', sans-serif;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-shadow: 0 0 10px rgba(0, 255, 247, 0.3);
}

.bg-type-selector {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.bg-type-btn {
    flex: 1;
    padding: 0.7rem;
    background: rgba(10, 10, 26, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.bg-type-btn:hover {
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
    box-shadow: 0 0 8px rgba(0, 255, 247, 0.15);
}

.bg-type-btn.active {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
    color: var(--bg-primary);
    border-color: var(--neon-cyan);
    box-shadow: var(--glow-cyan);
    font-weight: 700;
}

.gradient-presets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
    margin-top: 1rem;
}

.gradient-preset {
    height: 60px;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.gradient-preset::after {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 300%;
    height: 300%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
    animation: presetShine 3s ease-in-out infinite;
    opacity: 0;
}

.gradient-preset:hover::after {
    opacity: 1;
}

@keyframes presetShine {
    0%, 100% { transform: translateX(-100%) translateY(-100%); }
    50% { transform: translateX(0%) translateY(0%); }
}

.gradient-preset:hover {
    border-color: var(--neon-cyan);
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 255, 247, 0.2);
}

.gradient-preset.active {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 247, 0.4), inset 0 0 20px rgba(0, 255, 247, 0.1);
}

.gradient-preset.dark-saas {
    background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
}

.gradient-preset.neon {
    background: linear-gradient(135deg, #ff006e, #8338ec, #3a86ff);
}

.gradient-preset.pastel {
    background: linear-gradient(135deg, #ffd6ff, #e7c6ff, #c8b6ff);
}

.gradient-preset.ocean {
    background: linear-gradient(135deg, #00b4d8, #0077b6, #03045e);
}

.gradient-preset.sunset {
    background: linear-gradient(135deg, #ff9e00, #ff6b00, #ff0054);
}

.gradient-preset.forest {
    background: linear-gradient(135deg, #52b788, #2d6a4f, #1b4332);
}

.color-picker-group {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.color-input-wrapper {
    flex: 1;
}

.color-input-wrapper label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.upload-zone {
    border: 2px dashed var(--neon-cyan);
    border-radius: 16px;
    padding: 4rem 2rem;
    text-align: center;
    background: rgba(0, 255, 247, 0.04);
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 15px rgba(0, 255, 247, 0.08), inset 0 0 30px rgba(0, 255, 247, 0.02);
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 255, 247, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    opacity: 0.5;
    transition: opacity 0.4s ease;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.upload-zone::after {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-magenta), var(--neon-pink));
    z-index: -1;
    opacity: 0.2;
    transition: opacity 0.4s ease;
}

.upload-zone:hover::before {
    opacity: 1;
}

.upload-zone:hover {
    border-color: transparent;
    background: rgba(0, 255, 247, 0.08);
    transform: scale(1.02);
    box-shadow: 0 0 30px rgba(0, 255, 247, 0.15), inset 0 0 40px rgba(0, 255, 247, 0.04);
}

.upload-zone:hover::after {
    opacity: 0.5;
}

.upload-zone.dragover {
    border-color: transparent;
    background: rgba(0, 255, 247, 0.12);
    transform: scale(1.05);
    box-shadow: 0 0 40px rgba(0, 255, 247, 0.3), inset 0 0 50px rgba(0, 255, 247, 0.06);
}

.upload-zone.dragover::after {
    opacity: 0.7;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--neon-cyan);
    text-shadow: 0 0 30px var(--neon-cyan), 0 0 60px var(--neon-cyan);
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-weight: 700;
    letter-spacing: 4px;
    animation: flicker 3s ease-in-out infinite;
}

@keyframes flicker {
    0%, 100% { opacity: 1; }
    41% { opacity: 1; }
    42% { opacity: 0.85; }
    43% { opacity: 1; }
    45% { opacity: 0.7; }
    46% { opacity: 1; }
}

.upload-text {
    font-size: 1.2rem;
    color: var(--neon-cyan);
    margin-bottom: 0.5rem;
    font-weight: 600;
    text-shadow: 0 0 15px rgba(0, 255, 247, 0.5);
}

.upload-subtext {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.canvas-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 600px;
    position: relative;
    box-shadow: 0 0 15px rgba(0, 255, 247, 0.03);
}

.canvas-container:hover {
    border-color: rgba(0, 255, 247, 0.2);
    box-shadow: var(--glow-cyan);
    transition: all 0.4s ease;
}

#mainCanvas {
    max-width: 100%;
    max-height: 700px;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5), 0 0 15px rgba(0, 255, 247, 0.05);
}

.export-section {
    margin-top: 2rem;
}

.export-presets {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.export-preset {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(10, 10, 26, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.export-preset:hover {
    border-color: var(--neon-cyan);
    background: rgba(0, 255, 247, 0.05);
    box-shadow: 0 0 10px rgba(0, 255, 247, 0.1);
}

.export-preset input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--neon-cyan);
}

.export-preset-info {
    flex: 1;
}

.export-preset-name {
    color: var(--neon-cyan);
    font-weight: 600;
    margin-bottom: 0.2rem;
    font-size: 0.9rem;
}

.export-preset-size {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.export-btn, .export-all-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--neon-green), #00cc33);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s ease;
    margin-top: 0.5rem;
    box-shadow: var(--glow-green);
}

.export-btn:hover, .export-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.5), 0 0 40px rgba(0, 255, 65, 0.2);
}

.export-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.preview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    animation: scaleIn 0.4s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.preview-card:hover {
    transform: translateY(-5px);
    border-color: var(--neon-magenta);
    box-shadow: var(--glow-magenta);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.preview-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--neon-magenta);
    font-family: Calibri, 'Segoe UI', sans-serif;
}

.preview-size {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: rgba(255, 0, 255, 0.08);
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 0, 255, 0.15);
}

.preview-image-container {
    background: rgba(10, 10, 26, 0.6);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    position: relative;
    overflow: hidden;
}

.preview-image-container::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: repeating-conic-gradient(rgba(255,255,255,0.02) 0% 25%, transparent 0% 50%) 50% / 20px 20px;
}

.preview-image {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    position: relative;
    z-index: 1;
}

.download-btn {
    width: 100%;
    padding: 0.8rem;
    background: linear-gradient(135deg, var(--neon-magenta), var(--neon-pink));
    color: #fff;
    border: none;
    border-radius: 8px;
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-weight: 700;
    font-size: 0.8rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: all 0.3s ease;
    box-shadow: var(--glow-magenta);
}

.download-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.5), 0 0 40px rgba(255, 0, 110, 0.3);
}

.download-btn:active {
    transform: scale(0.98);
}

.download-all {
    margin-top: 2rem;
    text-align: center;
}

.download-all-btn {
    padding: 1.2rem 3rem;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
    color: var(--bg-primary);
    border: none;
    border-radius: 12px;
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 3px;
    transition: all 0.3s ease;
    box-shadow: var(--glow-cyan);
}

.download-all-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 25px rgba(0, 255, 247, 0.5), 0 0 50px rgba(0, 255, 247, 0.2);
}

.guide-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 0 15px rgba(0, 255, 247, 0.03);
}

.guide-section {
    margin-bottom: 3rem;
}

.guide-section h2 {
    color: var(--neon-cyan);
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    text-shadow: 0 0 10px rgba(0, 255, 247, 0.2);
}

.guide-section h3 {
    color: var(--neon-magenta);
    font-size: 1.2rem;
    margin: 1.5rem 0 1rem 0;
    text-shadow: 0 0 8px rgba(255, 0, 255, 0.2);
}

.guide-section p, .guide-section li {
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.guide-section ul, .guide-section ol {
    margin-left: 2rem;
    margin-top: 1rem;
}

.guide-section a {
    color: var(--neon-cyan);
    text-decoration: none;
    transition: color 0.3s ease;
}

.guide-section a:hover {
    color: var(--neon-magenta);
    text-shadow: 0 0 10px var(--neon-magenta);
}

.checklist {
    background: rgba(0, 255, 65, 0.05);
    border-left: 3px solid var(--neon-green);
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    box-shadow: 0 0 10px rgba(0, 255, 65, 0.05);
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 0.8rem 0;
    color: var(--text-primary);
}

.checklist-item::before {
    content: '\2610';
    font-size: 1.4rem;
    color: var(--neon-green);
    text-shadow: 0 0 8px var(--neon-green);
}

.specs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: rgba(10, 10, 26, 0.5);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.specs-table th {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
    color: var(--bg-primary);
    padding: 1rem;
    text-align: left;
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
}

.specs-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.specs-table tr:hover {
    background: rgba(0, 255, 247, 0.04);
}

.specs-table tr:last-child td {
    border-bottom: none;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.alert-warning {
    background: rgba(255, 183, 3, 0.08);
    border-left: 3px solid var(--neon-yellow);
    color: var(--neon-yellow);
    box-shadow: 0 0 10px rgba(255, 183, 3, 0.05);
}

.alert-info {
    background: rgba(0, 255, 247, 0.05);
    border-left: 3px solid var(--neon-cyan);
    color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 255, 247, 0.05);
}

.options-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
}

.options-panel:hover {
    border-color: rgba(0, 255, 247, 0.2);
    box-shadow: var(--glow-cyan);
    transition: all 0.4s ease;
}

.option-group {
    margin-bottom: 1.5rem;
}

.option-label {
    display: block;
    color: var(--neon-cyan);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

select, input[type="number"], input[type="color"], input[type="range"] {
    width: 100%;
    padding: 0.8rem;
    background: rgba(10, 10, 26, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

select:focus, input:focus {
    outline: none;
    border-color: var(--neon-cyan);
    box-shadow: 0 0 0 3px rgba(0, 255, 247, 0.1), 0 0 10px rgba(0, 255, 247, 0.1);
}

input[type="color"] {
    height: 50px;
    cursor: pointer;
}

input[type="range"] {
    padding: 0;
    accent-color: var(--neon-cyan);
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    padding: 3rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

footer a {
    color: var(--neon-cyan);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--neon-magenta);
    text-shadow: 0 0 10px var(--neon-magenta);
}

@media (max-width: 1024px) {
    .workspace {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .tabs {
        flex-direction: column;
    }

    .tab:not(:last-child)::after {
        display: none;
    }

    .preview-grid {
        grid-template-columns: 1fr;
    }

    .guide-content {
        padding: 1.5rem;
    }
}

.donate-fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--neon-magenta), var(--neon-pink));
    color: #fff;
    font-family: Calibri, 'Segoe UI', sans-serif;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-decoration: none;
    box-shadow: var(--glow-magenta);
    transition: all 0.25s ease;
    text-transform: uppercase;
}

.donate-fab:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 0 25px rgba(255, 0, 255, 0.6), 0 0 50px rgba(255, 0, 110, 0.3);
}

.donate-fab:active {
    transform: scale(0.97);
}

.bg-option {
    display: none;
}

.bg-option.active {
    display: block;
}

select option {
    background: var(--bg-primary);
    color: var(--text-primary);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neon-cyan);
    box-shadow: 0 0 8px rgba(0, 255, 247, 0.3);
}

::selection {
    background: rgba(0, 255, 247, 0.3);
    color: #fff;
}