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

:root {
    --primary-color: #ff1c03;
    --primary-hover: #e6190a;
    --background-color: #0a0a0a;
    --surface-color: #1a1a1a;
    --surface-hover: #252525;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #333333;
    --border-radius: 12px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 100%;
    margin: 0 auto;
    padding: var(--spacing-sm);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    padding: var(--spacing-md) 0;
}

.logo-container {
    display: inline-block;
}

.logo {
    height: 60px;
    width: auto;
    max-width: 200px;
}

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Upload Section */
.upload-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    gap: var(--spacing-lg);
}

.upload-area {
    background-color: var(--surface-color);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    max-width: 400px;
}

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

.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: var(--surface-hover);
    transform: scale(1.02);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.upload-icon {
    font-size: 3rem;
    opacity: 0.7;
}

.upload-area h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0;
}

.upload-area p {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    margin: 0;
}

/* Buttons */
.upload-btn,
.download-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    min-width: 120px;
}

.upload-btn:hover,
.download-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 28, 3, 0.3);
}

.upload-btn:active,
.download-btn:active {
    transform: translateY(0);
}

.linkedin-icon-link {
    display: inline-block;
    margin-top: var(--spacing-md);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.linkedin-icon-link:hover {
    transform: scale(1.1);
    opacity: 0.8;
}

.linkedin-icon {
    width: 32px;
    height: 32px;
    display: block;
}

/* Processing Section */
.processing-section {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.loading {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.preview-section h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

.preview-container {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: 0 auto;
    margin-bottom: var(--spacing-lg);
    display: inline-block;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

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

    .logo {
        height: 80px;
    }

    .upload-area {
        padding: var(--spacing-xl) var(--spacing-xl);
    }

    .upload-icon {
        font-size: 4rem;
    }

    #previewCanvas {
        width: 350px;
        height: 350px;
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: 900px;
    }

    #previewCanvas {
        width: 400px;
        height: 400px;
    }
}

/* Touch and Accessibility */
@media (hover: none) and (pointer: coarse) {
    .upload-btn,
    .download-btn {
        min-height: 52px;
        font-size: var(--font-size-lg);
    }

    .upload-area {
        padding: var(--spacing-lg);
    }
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-md) 0;
    margin-top: auto;
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #666666;
        --text-secondary: #cccccc;
    }
}