:root {
    --primary-color: #6366f1;
    --bg-color: #0a0a0f;
    --text-color: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, #13131f 0%, #080810 100%);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
}

.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 12px;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-area.small {
    padding: 1.5rem;
}

.upload-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    fill: var(--primary-color);
}

.controls-section {
    margin: 2rem 0;
    padding: 2rem;
}

.tab-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.text-input {
    width: 100%;
    padding: 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.color-picker {
    width: 100%;
    height: 40px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.adjustment-controls {
    margin: 2rem 0;
}

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

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: rgba(255, 255, 255, 0.7);
}

input[type="range"] {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.preview-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
    border-radius: 12px;
    overflow: hidden;
}

#previewCanvas {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.primary-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.notification {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    transform: translateY(150%);
    opacity: 0;
    transition: all 0.3s ease;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .upload-area {
        padding: 2rem;
    }

    .controls-section {
        padding: 1.5rem;
    }
}