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

:root {
    /* Color System - Swiss Clean Design */
    --background: #FFFFFF;
    --foreground: #18181B;
    --muted-foreground: #71717A;
    --border: #E4E4E7;
    --primary: #2563EB;
    --secondary: #EFF6FF;
    --card: transparent;

    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 20px;
    --font-size-xl: 28px;
    --font-size-2xl: 36px;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-m: 12px;
    --radius-l: 16px;
    --radius-pill: 100px;

    /* Container Width */
    --container-width: 1440px;
    --sidebar-width: 320px;
    --nav-height: 64px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.5;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
}

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

/* Navigation Bar */
.navbar {
    height: var(--nav-height);
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1.5px solid var(--border);
    background-color: var(--card);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--foreground);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--muted-foreground);
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link.active {
    color: var(--primary);
    text-decoration: underline;
}

/* Main Content Layout */
.main-content {
    display: flex;
    flex: 1;
    min-height: calc(100vh - var(--nav-height));
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    padding: var(--spacing-xl);
    border-right: 1.5px solid var(--border);
    background-color: var(--card);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.avatar-frame {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 1.5px solid var(--border);
    background-color: var(--secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background-color: var(--secondary);
}

.profile-name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--foreground);
    text-align: center;
    margin-top: var(--spacing-sm);
}

.profile-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--primary);
    text-align: center;
}

.profile-bio {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
    text-align: center;
    line-height: 1.5;
    margin-top: var(--spacing-sm);
}

.divider {
    width: 100%;
    height: 1.5px;
    background-color: var(--border);
    margin: var(--spacing-md) 0;
}

.section-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--foreground);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
    align-self: flex-start;
}

.contact-list,
.social-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
}

.contact-item,
.social-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact-icon {
    width: 16px;
    height: 16px;
    color: var(--muted-foreground);
}

.contact-text {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
}

.contact-link,
.social-link {
    font-size: var(--font-size-sm);
    color: var(--primary);
    text-decoration: none;
}

.contact-link:hover,
.social-link:hover {
    text-decoration: underline;
}

/* Content Sections */
.content-sections {
    flex: 1;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    overflow-y: auto;
}

.content-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--foreground);
    letter-spacing: -0.5px;
}

.section-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.section-content p {
    font-size: var(--font-size-base);
    color: var(--muted-foreground);
    line-height: 1.6;
}

/* Cards */
.publication-card,
.education-card,
.research-card,
.project-card {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-m);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    transition: border-color 0.2s ease;
}

.publication-card.highlight,
.education-card.highlight,
.research-card.highlight,
.project-card.highlight {
    border-color: var(--primary);
}

.pub-info,
.edu-time,
.research-time,
.project-info {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.pub-year,
.edu-year,
.research-year,
.project-year {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--primary);
}

.pub-journal,
.edu-duration,
.research-role,
.project-type {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
}

.pub-impact {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
    margin-left: auto;
}

.pub-details,
.edu-details,
.research-details,
.project-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.pub-title,
.edu-degree,
.research-title,
.project-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--foreground);
    line-height: 1.4;
}

.pub-authors,
.edu-school,
.research-desc,
.project-desc {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
}

.pub-desc,
.edu-thesis,
.edu-gpa {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
    line-height: 1.5;
}

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

.pub-doi .icon {
    width: 16px;
    height: 16px;
    color: var(--muted-foreground);
}

.doi-text {
    font-size: var(--font-size-xs);
    color: var(--muted-foreground);
}

/* Research Tags */
.research-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-xs);
}

.tag {
    font-size: var(--font-size-xs);
    color: var(--primary);
    background-color: var(--secondary);
    padding: 2px 8px;
    border-radius: var(--radius-m);
}

/* Project Achievements */
.project-achievements {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.achievement {
    font-size: var(--font-size-xs);
    color: var(--muted-foreground);
    background-color: var(--secondary);
    padding: 2px 8px;
    border-radius: var(--radius-m);
}

/* Skills Section */
.skills-container {
    display: flex;
    gap: var(--spacing-lg);
}

.skills-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.skill-category {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.category-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--foreground);
}

.skill-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.skill-tag {
    font-size: var(--font-size-sm);
    color: var(--primary);
    background-color: var(--secondary);
    padding: 4px 12px;
    border-radius: var(--radius-m);
}

/* Footer */
.page-footer {
    padding: var(--spacing-xl);
    border-top: 1.5px solid var(--border);
    background-color: var(--card);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-text {
    font-size: var(--font-size-sm);
    color: var(--muted-foreground);
    text-align: center;
}

.footer-subtext {
    font-size: var(--font-size-xs);
    color: var(--muted-foreground);
    text-align: center;
}

/* Responsive Design */
@media (max-width: 1024px) {
    :root {
        --container-width: 100%;
        --sidebar-width: 280px;
    }

    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1.5px solid var(--border);
        padding: var(--spacing-lg);
    }

    .profile-section {
        flex-direction: row;
        align-items: flex-start;
        text-align: left;
        gap: var(--spacing-lg);
    }

    .avatar-frame {
        width: 120px;
        height: 120px;
        flex-shrink: 0;
    }

    .profile-name,
    .profile-title,
    .profile-bio {
        text-align: left;
    }

    .content-sections {
        padding: var(--spacing-lg);
    }

    .skills-container {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 0 var(--spacing-lg);
        height: auto;
        min-height: var(--nav-height);
    }

    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm) 0;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

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

    .avatar-frame {
        width: 160px;
        height: 160px;
    }

    .profile-name,
    .profile-title,
    .profile-bio {
        text-align: center;
    }

    .pub-info,
    .edu-time,
    .research-time,
    .project-info {
        flex-wrap: wrap;
    }

    .pub-impact {
        margin-left: 0;
        width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 24px;
        --spacing-lg: 20px;
        --spacing-md: 16px;
        --spacing-sm: 12px;
        --spacing-xs: 8px;
    }

    .navbar,
    .sidebar,
    .content-sections,
    .page-footer {
        padding: var(--spacing-lg);
    }

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

    .pub-title,
    .edu-degree,
    .research-title,
    .project-title {
        font-size: var(--font-size-sm);
    }

    .skill-tag {
        font-size: var(--font-size-xs);
        padding: 3px 8px;
    }
}

/* Print Styles */
@media print {
    body {
        background-color: white;
    }

    .page-container {
        max-width: 100%;
        box-shadow: none;
        margin: 0;
    }

    .navbar {
        position: static;
        border-bottom: 1px solid var(--border);
    }

    .sidebar {
        border: 1px solid var(--border);
        page-break-inside: avoid;
    }

    .content-section {
        page-break-inside: avoid;
    }

    .nav-link.active {
        color: var(--foreground);
        text-decoration: none;
    }

    .contact-link,
    .social-link {
        color: var(--foreground);
        text-decoration: none;
    }
}