/* CSS Variables for theming */
:root {
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-surface-hover: #e9ecef;
    --color-text: #212529;
    --color-text-secondary: #6c757d;
    --color-border: #dee2e6;
    --color-primary: #007bff;
    --color-primary-hover: #0056b3;
    --color-secondary: #6c757d;
    --color-secondary-hover: #545b62;
    --color-error: #dc3545;
    --color-success: #28a745;
    --color-focus: #007bff;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-shadow-hover: rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --transition: all 0.2s ease;
}

/* Dark theme overrides */
[data-theme="dark"] {
    --color-bg: #121212;
    --color-surface: #1e1e1e;
    --color-surface-hover: #2a2a2a;
    --color-text: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-border: #333333;
    --color-primary: #4dabf7;
    --color-primary-hover: #339af0;
    --color-secondary: #868e96;
    --color-secondary-hover: #6c757d;
    --color-error: #fa5252;
    --color-success: #40c057;
    --color-focus: #4dabf7;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-hover: rgba(0, 0, 0, 0.4);
}

/* System preference dark mode */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #121212;
        --color-surface: #1e1e1e;
        --color-surface-hover: #2a2a2a;
        --color-text: #ffffff;
        --color-text-secondary: #a0a0a0;
        --color-border: #333333;
        --color-primary: #4dabf7;
        --color-primary-hover: #339af0;
        --color-secondary: #868e96;
        --color-secondary-hover: #6c757d;
        --color-error: #fa5252;
        --color-success: #40c057;
        --color-focus: #4dabf7;
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-shadow-hover: rgba(0, 0, 0, 0.4);
    }
}

/* Reset and base styles */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    transition: var(--transition);
}

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

/* Hide focus for mouse users but keep for keyboard users */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Typography */
h1, h2, h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
    line-height: 1.3;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
    color: var(--color-text-secondary);
}

p {
    margin: 0 0 var(--spacing-md) 0;
}

/* Layout */
.navbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 70px;
}

.nav-brand h1 {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 123, 255, 0.1), transparent);
    transition: left 0.5s;
}

.nav-link:hover::before {
    left: 100%;
}

.nav-link:hover {
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-1px);
}

.nav-link.active {
    color: var(--color-primary);
    background: rgba(0, 123, 255, 0.1);
    border: 1px solid rgba(0, 123, 255, 0.2);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 1px;
}

.nav-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.whatsapp-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    padding: 12px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.whatsapp-toggle:hover {
    background: rgba(37, 211, 102, 0.2);
    border-color: rgba(37, 211, 102, 0.4);
    transform: scale(1.05);
    box-shadow: 0 4px 20px rgba(37, 211, 102, 0.3);
}

.whatsapp-icon {
    width: 18px;
    height: 18px;
    transition: transform 0.3s ease;
    color: currentColor;
}

.whatsapp-toggle:hover .whatsapp-icon {
    transform: scale(1.1);
}

.main {
    padding: var(--spacing-xl) var(--spacing-lg);
    max-width: 840px;
    margin: 0 auto;
}

.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
}

.footer-section h3 {
    color: var(--color-text);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    margin-top: 0;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--color-primary);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 4px 0;
}

.contact-link:hover {
    color: var(--color-primary);
    transform: translateX(1px);
}

.contact-icon {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
    color: currentColor;
    flex-shrink: 0;
}

.contact-link:hover .contact-icon {
    transform: scale(1.2);
}

.footer-section p {
    margin: 0;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-lg);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
}

.footer-bottom p {
    margin: 0;
}

.container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Generator section */
.generator-section,
.preview-section {
    background-color: var(--color-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--color-shadow);
}

/* Form styles */
.generator-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 500;
    color: var(--color-text);
}

textarea,
input[type="text"],
input[type="number"],
input[type="color"],
input[type="range"],
input[type="tel"],
input[type="email"],
input[type="url"],
select {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: inherit;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

input[type="file"] {
    padding: var(--spacing-xs);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    background-color: var(--color-bg);
    color: var(--color-text);
}

input[type="file"]:focus,
textarea:focus,
input:focus,
select:focus {
    border-color: var(--color-focus);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.input-error {
    border-color: var(--color-error) !important;
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1) !important;
}

.form-error {
    color: var(--color-error) !important;
}

/* Mobile optimization for phone inputs */
input[type="tel"] {
    -webkit-appearance: none;
    -moz-appearance: textfield;
}

/* Remove spinner from number inputs on webkit browsers */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.checkbox-group input[type="checkbox"] {
    margin: 0;
}

.input-section {
    transition: var(--transition);
}

.password-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-group input[type="password"],
.password-input-group input[type="text"] {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: inherit;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
    padding-right: 40px;
    width: 100%;
    box-sizing: border-box;
}

.password-input-group input[type="password"]:focus,
.password-input-group input[type="text"]:focus {
    border-color: var(--color-focus);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.password-toggle {
    position: absolute;
    right: var(--spacing-sm);
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.password-toggle:hover {
    color: var(--color-text);
    background-color: var(--color-surface-hover);
}

.eye-icon {
    width: 20px;
    height: 20px;
}

.form-hint {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
    transition: transform 0.1s ease;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.btn:disabled:hover {
    transform: none;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 123, 255, 0.1), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary) 0%, #0056b3 100%);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 6px 25px rgba(0, 123, 255, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-secondary:hover::before {
    opacity: 1;
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text);
    border-color: var(--color-text-secondary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.btn-outline {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.btn-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 123, 255, 0.1), transparent);
    transition: left 0.5s;
}

.btn-outline:hover::before {
    left: 100%;
}

.btn-outline:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary) 0%, #0056b3 100%);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 6px 25px rgba(0, 123, 255, 0.4);
    transform: translateY(-2px);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    padding: 12px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* Preview section */
.preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: 32px;
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
    border-radius: 16px;
    border: 1px solid var(--color-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.preview-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.qr-preview {
    width: 100%;
    height: 100%;
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border: 2px dashed var(--color-border);
    border-radius: 12px;
    overflow: auto;
    position: relative;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05);
}

.qr-preview:hover {
    border-color: var(--color-primary);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05), 0 0 0 3px rgba(0, 123, 255, 0.1);
    transform: translateY(-1px);
}

.qr-preview::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.qr-preview::-webkit-scrollbar-track {
    background: var(--color-surface);
    border-radius: 4px;
}

.qr-preview::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
    transition: background 0.2s ease;
}

.qr-preview::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

.qr-preview::-webkit-scrollbar-corner {
    background: var(--color-surface);
}

.qr-preview svg {
    max-width: none;
    max-height: none;
    flex-shrink: 0;
}

.qr-info {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
    padding: 12px 16px;
    background: var(--color-surface);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(5px);
    max-width: 100%;
    word-wrap: break-word;
}

.download-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 20px;
    background: var(--color-surface);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
}



/* Error states */
.form-error {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.input-error {
    border-color: var(--color-error);
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.loading::after {
    content: "";
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: var(--spacing-sm);
}

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

/* Responsive design */
@media (max-width: 768px) {
    .main {
        padding: var(--spacing-lg);
    }

    .nav-container {
        padding: 0 var(--spacing-md);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .footer-section {
        padding: 0 var(--spacing-md);
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--color-surface);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: var(--spacing-xl) 0;
        gap: var(--spacing-lg);
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 2px 0 20px rgba(0, 0, 0, 0.1);
        border-top: 1px solid var(--color-border);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        font-size: var(--font-size-lg);
        padding: 16px 24px;
        width: 80%;
        text-align: center;
        border-radius: 12px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-brand h1 {
        font-size: var(--font-size-lg);
    }

    .whatsapp-toggle {
        padding: 10px;
    }

    .whatsapp-icon {
        width: 16px;
        height: 16px;
    }

    .generator-section,
    .preview-section,
    .history-section {
        padding: var(--spacing-md);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .form-actions,
    .download-actions {
        flex-direction: column;
    }

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

    .preview-container {
        padding: var(--spacing-md);
    }

    .qr-preview {
        min-height: 280px;
    }

    .history-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .history-thumbnail {
        align-self: center;
    }
}

@media (max-width: 480px) {
    .qr-preview {
        min-height: 240px;
    }

    .main {
        padding: var(--spacing-md);
    }

    .nav-container {
        padding: 0 var(--spacing-sm);
        min-height: 60px;
    }

    .nav-menu {
        top: 60px;
        height: calc(100vh - 60px);
    }

    .nav-brand h1 {
        font-size: var(--font-size-md);
    }

    .nav-link {
        font-size: var(--font-size-md);
        padding: 12px 20px;
        width: 90%;
    }
}

/* Print styles */
@media print {
    .theme-toggle,
    .download-actions,
    .form-actions {
        display: none !important;
    }

    .header,
    .footer {
        display: none !important;
    }

    .main {
        padding: 0 !important;
    }
}

/* Range input styling */
.range-value {
    text-align: center;
    font-weight: 600;
    color: var(--color-primary);
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

/* File upload styling */
.file-upload-container {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
    background-color: var(--color-surface);
    cursor: pointer;
}

.file-upload-container:hover {
    border-color: var(--color-primary);
    background-color: var(--color-surface-hover);
}

.file-upload-container input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.file-upload-info {
    pointer-events: none;
    z-index: 1;
}

.file-upload-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.file-upload-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.file-upload-label {
    font-weight: 600;
    color: var(--color-text);
}

.file-upload-hint {
    font-size: var(--font-size-sm);
}

/* Enhanced file upload preview */
.file-upload-preview {
    margin-top: var(--spacing-md);
    max-width: 200px;
    max-height: 200px;
    margin-left: auto;
    margin-right: auto;
    border-radius: var(--border-radius);
    overflow: hidden;
    display: none;
    border: 2px solid var(--color-border);
    background-color: var(--color-surface);
    padding: var(--spacing-sm);
}

.file-upload-preview.has-image {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

.file-upload-preview img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--border-radius-sm);
    display: block;
}

/* Animation for image preview */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Picture QR code info styling */
.picture-qr-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--color-surface);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    border: 1px solid var(--color-border);
}

.picture-qr-info-icon {
    font-size: 1.2em;
    color: var(--color-primary);
}

/* Responsive adjustments for picture QR code */
@media (max-width: 768px) {
    .file-upload-container {
        padding: var(--spacing-md);
    }
    
    .file-upload-preview {
        max-width: 150px;
        max-height: 150px;
    }
    
    .range-value {
        font-size: 12px;
    }
}

/* Range input custom styling */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    margin: var(--spacing-sm) 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: 2px solid var(--color-bg);
    box-shadow: 0 2px 4px var(--color-shadow);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: 2px solid var(--color-bg);
    box-shadow: 0 2px 4px var(--color-shadow);
}

input[type="range"]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 3px var(--color-focus);
}

input[type="range"]:focus::-moz-range-thumb {
    box-shadow: 0 0 0 3px var(--color-focus);
}

/* Drag and drop styling */
.file-upload-container.dragover {
    border-color: var(--color-primary);
    background-color: var(--color-primary);
    color: white;
}

.file-upload-container.dragover .file-upload-text {
    color: white;
}

.file-upload-container.dragover .file-upload-label {
    color: white;
}