/* CSS Custom Properties for Dark Pastel Theme */
:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d3748;
    --bg-card: #374151;
    --text-primary: #f1f5f9;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-primary: #8b7cf8;
    --accent-secondary: #7dd3fc;
    --accent-success: #86efac;
    --border-color: #4b5563;
    --shadow-soft: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container and Layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Input Section */
.input-section {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-color);
}

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

.input-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.text-input {
    width: 100%;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: var(--transition);
}

.text-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(139, 124, 248, 0.1);
}

.text-input::placeholder {
    color: var(--text-muted);
}


/* QR Display Section */
.qr-display {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-color);
    text-align: center;
    animation: fadeInUp 0.5s ease-out;
}

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

.qr-container {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.qr-canvas, .qr-svg {
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-soft);
    background: white;
    padding: 1rem;
}

/* Download Section */
.download-section {
    margin-bottom: 2rem;
}

.download-title {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.download-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.download-btn {
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.download-btn:hover {
    border-color: var(--accent-primary);
    background: rgba(139, 124, 248, 0.1);
    transform: translateY(-1px);
}

.download-icon {
    font-size: 1.2rem;
}

/* Size Options */
.size-options {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

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

.size-select {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.size-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Clear Button */
.clear-btn {
    padding: 0.75rem 2rem;
    background: transparent;
    border: 2px solid var(--text-muted);
    border-radius: var(--border-radius-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.clear-btn:hover {
    border-color: var(--accent-success);
    color: var(--accent-success);
    background: rgba(134, 239, 172, 0.1);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .input-section,
    .qr-display {
        padding: 1.5rem;
    }
    
    .download-buttons {
        grid-template-columns: 1fr;
    }
    
    .size-options {
        flex-direction: column;
        gap: 0.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.5rem;
    }
    
    .input-section,
    .qr-display {
        padding: 1rem;
    }
    
    .title {
        font-size: 1.8rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}