:root {
    --bg-color: #1e1e2e;
    --text-color: #e4e4e7;
    --text-color-light: #a1a1aa;
    --text-color-lighter: #71717a;
    --text-color-bold: #ffffff;
    --border-color: #36384d;
    --primary-color: #818cf8;
    --hover-bg: #27293d;
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --text-color-light: #666;
    --text-color-lighter: #999;
    --text-color-bold: #000000;
    --border-color: #e0e0e0;
    --primary-color: #6366f1;
    --hover-bg: #f5f5f5;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1.1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header-nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.site-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color-bold);
    text-decoration: none;
    white-space: nowrap;
}

.header-tabs {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.header-tab {
    color: var(--text-color-light);
    text-decoration: none;
    font-size: 1.05rem;
    transition: all 0.2s;
    padding: 0.5rem 0;
    white-space: nowrap;
    font-weight: normal;
}

.header-tab:hover {
    color: var(--text-color);
}

.header-tab.active {
    color: var(--text-color-bold);
    font-weight: bold;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color-light);
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.theme-toggle:hover {
    color: var(--text-color);
}

/* Main Content */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 4rem 2rem 4rem;
    display: flex;
    gap: 3.5rem;
    align-items: flex-start;
}

/* Profile Sidebar */
.profile-sidebar {
    flex-shrink: 0;
    width: 280px;
}

.profile-image {
    text-align: center;
    margin-bottom: 1.5rem;
    width: 280px;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    border-radius: 50%;
    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-pic {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transform: scale(1.3);
}

.profile-info {
    text-align: center;
}

.profile-info h1 {
    margin: 0 0 0.5rem 0;
    font-size: 2.1rem;
    font-weight: 600;
    color: var(--text-color-bold);
    line-height: 1.2;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--text-color-light);
    margin: 0.5rem 0;
    font-weight: 400;
    line-height: 1.5;
}

.subtitle .company-link {
    color: #1428A0 !important;
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 500;
}

[data-theme="light"] .subtitle .company-link {
    color: #1428A0 !important;
}

[data-theme="dark"] .subtitle .company-link {
    color: #4A90E2 !important;
}

.subtitle .company-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.location {
    font-size: 1.2rem;
    color: var(--text-color-light);
    margin: 0.5rem 0 1rem 0;
}

.social-links {
    margin-top: 1.25rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-links a {
    color: var(--text-color-light);
    text-decoration: none;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: transparent;
}

.social-links a:hover {
    color: var(--primary-color);
    background: var(--hover-bg);
    transform: translateY(-2px);
}

.social-icon svg {
    width: 28px;
    height: 28px;
    display: block;
}

/* Content */
.content {
    flex: 1;
    min-width: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.content h2 {
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    font-size: 2.3rem;
    font-weight: 600;
    color: var(--text-color-bold);
    scroll-margin-top: 100px;
}

.content h2:first-of-type {
    margin-top: 0;
}

.content h3 {
    margin-top: 2rem;
    margin-bottom: 0.5rem;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-color-bold);
}

.content p {
    font-size: 1.2rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.content li {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.content strong {
    color: var(--text-color-bold);
    font-weight: 600;
}

.content a {
    color: var(--primary-color);
    text-decoration: none;
}

.content a:hover {
    text-decoration: underline;
}

.content dl {
    margin: 1.5rem 0;
}

.content dt {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color-bold);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.content dd {
    font-size: 1.2rem;
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.6;
    color: var(--text-color-light);
}

.company-samsung {
    color: #1428A0 !important;
    text-decoration: none;
    transition: opacity 0.2s;
}

.company-samsung:hover {
    opacity: 0.8;
    text-decoration: underline;
}

[data-theme="light"] .company-samsung {
    color: #1428A0 !important;
}

[data-theme="dark"] .company-samsung {
    color: #4A90E2 !important;
}

.company-sk {
    color: #E31E24 !important;
    text-decoration: none;
    transition: opacity 0.2s;
}

.company-sk:hover {
    opacity: 0.8;
    text-decoration: underline;
}

[data-theme="light"] .company-sk {
    color: #E31E24 !important;
}

[data-theme="dark"] .company-sk {
    color: #E31E24 !important;
}

/* Footer */
.site-footer {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 4rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content {
    color: var(--text-color-lighter);
    font-size: 0.85rem;
}

.footer-content a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-content a:hover {
    color: var(--text-color);
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
        gap: 2rem;
        padding: 1rem;
    }
    
    .profile-sidebar {
        width: 100%;
    }
    
    .header-nav {
        padding: 1rem;
        flex-wrap: wrap;
    }
    
    .header-left {
        flex-wrap: wrap;
    }
    
    .header-tabs {
        gap: 1rem;
    }
    
    .profile-info h1 {
        font-size: 2rem;
    }
    
    .profile-image {
        width: min(200px, 80vw);
        max-width: 100%;
    }
    
    .site-footer {
        padding: 1rem;
    }
}