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

:root {
    --color-primary: #C61610;
    --color-background: #FAFAFA;
    --color-text: #1A1A1A;
    --color-text-secondary: #666666;
    --color-border: #E0E0E0;
    --color-white: #FFFFFF;
    --max-width: 800px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
}

/* Navigation */
nav {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 2rem;
    justify-content: center;
}

nav a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}

nav a:hover,
nav a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Main Content */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

/* Profile Section */
.profile {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 3rem;
}

.profile-image {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-white);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
}

.profile h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.profile .title {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.profile .email {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.95rem;
}

.profile .email:hover {
    text-decoration: underline;
}

/* Card Sections */
.card {
    background-color: var(--color-white);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-primary);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.card p {
    margin-bottom: 1rem;
    color: var(--color-text);
}

.card p:last-child {
    margin-bottom: 0;
}

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    text-decoration: underline;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin-top: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

th {
    background-color: var(--color-background);
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
}

tr:hover {
    background-color: rgba(198, 22, 16, 0.03);
}

/* Lists */
.card ul {
    list-style: none;
    padding-left: 0;
}

.card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.9rem;
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

/* Teaching Page Specific */
.course-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
}

.course-name {
    font-weight: 500;
}

.course-semesters {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* Committee List */
.committee-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.committee-list li {
    padding: 0.25rem 0.75rem;
    background-color: var(--color-background);
    border-radius: 4px;
    font-size: 0.85rem;
}

.committee-list li::before {
    display: none;
}

/* Experience Items */
.experience-item {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.experience-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* Experience Cards */
.experience-cards {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.experience-card {
    flex: 1;
    min-width: 200px;
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.experience-card summary {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    list-style: none;
    text-align: center;
    transition: all 0.2s ease;
}

.experience-card summary::-webkit-details-marker {
    display: none;
}

.experience-card summary:hover {
    background-color: var(--color-primary);
}

.experience-card summary:hover .card-company,
.experience-card summary:hover .card-duration {
    color: var(--color-white);
}

.card-company {
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
    transition: color 0.2s ease;
}

.card-duration {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
    transition: color 0.2s ease;
}

.experience-card[open] {
    flex: 1 1 100%;
    background-color: var(--color-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.experience-card[open] summary {
    background-color: var(--color-primary);
    padding: 1rem 1.5rem;
}

.experience-card[open] .card-company,
.experience-card[open] .card-duration {
    color: var(--color-white);
}

.card-content {
    padding: 1.5rem;
}

.card-role {
    margin-bottom: 0.75rem;
}

.card-role strong {
    display: block;
    color: var(--color-text);
    font-size: 0.95rem;
}

.card-role span {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.card-content p {
    margin-top: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    line-height: 1.7;
}

.card-content p:last-child,
.card-content .card-role:last-child {
    margin-bottom: 0;
}

.experience-item h3,
.academic-subsection h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.experience-item h4,
.academic-subsection h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.role {
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 0.25rem !important;
}

.duration {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.75rem !important;
}

.location {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem !important;
}

/* Academic Subsections */
.academic-subsection {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.academic-subsection:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* Placeholder */
.placeholder {
    color: var(--color-text-secondary);
    padding: 2rem;
    text-align: center;
    background-color: var(--color-background);
    border-radius: 4px;
}

/* Page Title */
.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--color-text);
}

/* Back Link */
.back-link {
    margin-top: 2rem;
    text-align: center;
}

.back-link a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

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

/* Academic Links */
.academic-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.academic-links a {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
    font-weight: 500;
    transition: all 0.2s ease;
}

.academic-links a:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1.5rem;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-border);
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 600px) {
    nav ul {
        gap: 0.25rem 1rem;
        padding: 0.75rem 1rem;
    }

    nav a {
        font-size: 0.9rem;
    }

    main {
        padding: 2rem 1rem;
    }

    .profile-image {
        width: 140px;
        height: 140px;
    }

    .profile h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: 1.5rem;
    }

    th, td {
        padding: 0.5rem;
        font-size: 0.8rem;
    }

    .page-title {
        font-size: 1.4rem;
    }
}