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

/* CSS Custom Properties */
:root {
    /* Colors - Light Theme */
    --color-bg: #ffffff;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a5568;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-border: #e5e7eb;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --line-height-normal: 1.6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
}

/* Base Styles */
html {
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: var(--line-height-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Main Container */
.container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* Avatar Section */
.avatar-section {
    margin-bottom: var(--spacing-xl);
}

.avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--color-bg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.avatar:hover {
    transform: scale(1.05);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Bio Section */
.bio-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.title {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
    max-width: 500px;
    margin: 0 auto;
}

/* Social Links Section */
.social-section {
    margin-top: var(--spacing-lg);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    align-items: center;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background-color: var(--color-bg);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.social-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.social-link:active {
    transform: translateY(0);
}

.social-icon {
    width: 24px;
    height: 24px;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    border-top: 1px solid var(--color-border);
}

/* Responsive Design */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-md);
    }

    .avatar {
        width: 120px;
        height: 120px;
    }

    .name {
        font-size: var(--font-size-xl);
    }

    .title {
        font-size: var(--font-size-base);
    }

    .description {
        font-size: var(--font-size-sm);
    }

    .social-links {
        gap: var(--spacing-sm);
    }

    .social-link {
        width: 44px;
        height: 44px;
    }

    .social-icon {
        width: 22px;
        height: 22px;
    }
}

@media (min-width: 768px) {
    .avatar {
        width: 180px;
        height: 180px;
    }
}

/* Print Styles */
@media print {
    .social-link {
        color: var(--color-text-primary);
    }

    .avatar {
        box-shadow: none;
    }
}