:root {
    --neon-cyan: #00f5ff;
    --neon-pink: #ff1493;
    --neon-purple: #bf00ff;
    --neon-yellow: #fff01f;
    --color-bg: #0a0a0f;
    --color-surface: #12121a;
    --color-surface-alt: #1a1a24;
    --color-border: #2a2a3a;
    --color-text: #e8e8f0;
    --color-text-muted: #8888a0;
    --font-heading: 'Orbitron', 'Courier New', monospace;
    --font-body: 'Rajdhani', 'Segoe UI', sans-serif;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --glow-cyan: 0 0 4px rgba(0, 245, 255, 0.5);
    --glow-pink: 0 0 4px rgba(255, 20, 147, 0.5);
    --glow-purple: 0 0 4px rgba(191, 0, 255, 0.5);
    --ease-out: cubic-bezier(0.25, 1, 0.5, 1);
}

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

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    background-image:
        radial-gradient(ellipse at 20% 80%, rgba(0, 245, 255, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 20, 147, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(191, 0, 255, 0.02) 0%, transparent 70%);
    min-height: 100vh;
    padding: 24px 16px;
    color: var(--color-text);
    line-height: 1.5;
}

.container {
    max-width: 520px;
    margin: 0 auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neon-cyan);
    box-shadow: var(--glow-cyan);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, rgba(0, 245, 255, 0.1) 0%, rgba(191, 0, 255, 0.1) 100%);
    border-bottom: 1px solid var(--neon-cyan);
    padding: 20px 24px;
    position: relative;
}

.header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
}

.header h1 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--neon-cyan);
    text-shadow: 0 0 4px rgba(0, 245, 255, 0.6);
}

.main-content {
    padding: 24px;
}

.preview-section {
    margin-bottom: 20px;
}

.canvas-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    background: var(--color-surface-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s var(--ease-out);
}

.canvas-container.has-image {
    border-color: var(--neon-pink);
    box-shadow: var(--glow-pink);
}

.canvas-container.drag-over {
    border-color: var(--neon-purple);
    box-shadow: var(--glow-purple);
    background: rgba(191, 0, 255, 0.05);
}

#previewCanvas {
    max-width: 100%;
    max-height: 100%;
    display: none;
}

.canvas-container.has-image #previewCanvas {
    display: block;
}

.placeholder {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    text-align: center;
    padding: 20px;
    line-height: 1.8;
    letter-spacing: 0.05em;
}

.canvas-container.has-image .placeholder {
    display: none;
}

.upload-section {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.file-input {
    display: none;
}

.file-input-label {
    cursor: pointer;
}

.file-button {
    display: inline-block;
    background: transparent;
    color: var(--neon-cyan);
    padding: 10px 18px;
    border: 1px solid var(--neon-cyan);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-body);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: all 0.2s var(--ease-out);
}

.file-button:hover {
    background: rgba(0, 245, 255, 0.1);
    transform: translateY(-1px);
}

.file-button.small {
    padding: 8px 14px;
    font-size: 0.75rem;
}

.file-name {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 180px;
}

.file-name.small {
    font-size: 0.8rem;
}

.settings-section {
    background: var(--color-surface-alt);
    padding: 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border: 1px solid var(--color-border);
    position: relative;
}

.settings-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    right: 20px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--neon-purple), transparent);
}

.settings-section h2 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--neon-purple);
    margin-bottom: 16px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.setting-group {
    margin-bottom: 16px;
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.effect-select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font-body);
    color: var(--color-text);
    cursor: pointer;
    transition: border-color 0.15s var(--ease-out);
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238888a0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.effect-select:hover,
.effect-select:focus {
    border-color: var(--neon-cyan);
    outline: none;
}

.effect-select option {
    background: var(--color-surface);
    color: var(--color-text);
}

.animation-buttons {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.animation-btn {
    flex: 1;
    min-width: 70px;
    padding: 8px 10px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.15s var(--ease-out);
    color: var(--color-text);
}

.animation-btn:hover {
    border-color: var(--color-text-muted);
    background: rgba(255, 255, 255, 0.03);
}

.animation-btn.active {
    border-color: var(--neon-cyan);
    background: rgba(0, 245, 255, 0.15);
    color: var(--neon-cyan);
}

.float-settings {
    margin-top: 10px;
    padding: 12px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.setting-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.setting-row:last-child {
    margin-bottom: 0;
}

.setting-label-inline {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 500;
    min-width: 60px;
    letter-spacing: 0.05em;
}

.direction-buttons {
    display: flex;
    gap: 6px;
}

.direction-btn {
    padding: 5px 10px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.15s var(--ease-out);
    color: var(--color-text);
}

.direction-btn:hover {
    border-color: var(--color-text-muted);
}

.direction-btn.active {
    border-color: var(--neon-yellow);
    background: rgba(255, 240, 31, 0.15);
    color: var(--neon-yellow);
}

.slider.small {
    flex: 1;
}

.custom-upload {
    margin-top: 10px;
    padding: 12px;
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    border: 1px solid var(--color-border);
}

.slider {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--neon-cyan);
    cursor: pointer;
    transition: all 0.15s var(--ease-out);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--neon-cyan);
    cursor: pointer;
    border: none;
}

.action-section {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.action-btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.2s var(--ease-out);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.action-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.preview-btn {
    background: transparent;
    border: 2px solid var(--neon-purple);
    color: var(--neon-purple);
}

.preview-btn:not(:disabled):hover {
    background: rgba(191, 0, 255, 0.15);
    transform: translateY(-1px);
}

.generate-btn {
    background: var(--neon-pink);
    color: #0a0a0f;
}

.generate-btn:not(:disabled):hover {
    background: #ff3da5;
    transform: translateY(-1px);
}

.progress-section {
    background: var(--color-surface-alt);
    padding: 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
    border-radius: 3px;
    transition: width 0.3s var(--ease-out);
}

.progress-text {
    display: block;
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

.footer {
    background: var(--color-surface-alt);
    padding: 14px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.7rem;
    border-top: 1px solid var(--color-border);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .header {
        padding: 16px 18px;
    }

    .header h1 {
        font-size: 1rem;
    }

    .main-content {
        padding: 18px;
    }

    .effect-btn,
    .animation-btn {
        min-width: 60px;
        padding: 7px 8px;
        font-size: 0.75rem;
    }

    .action-btn {
        padding: 11px 16px;
        font-size: 0.8rem;
    }
}