body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f8f9fa;
    color: #1f2937;
    line-height: 1.6;
}

.page-shell {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px 80px;
}

.hero {
    display: grid;
    grid-template-columns: 1.4fr 0.8fr;
    gap: 30px;
    align-items: center;
    margin-bottom: 32px;
}

.hero-copy h1 {
    font-size: 2.3rem;
    margin: 8px 0 12px;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.8rem;
    color: #4b5563;
    font-weight: 700;
    margin: 0;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
}

.btn {
    display: inline-block;
    padding: 10px 16px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
}

.btn-primary {
    background-color: #2563eb;
    color: white;
}

.btn-secondary {
    background-color: #e5e7eb;
    color: #111827;
}

.profile-photo {
    width: 100%;
    max-width: 280px;
    aspect-ratio: 1;
    height: auto;
    object-fit: cover;
    display: block;
    margin-left: auto;
    border-radius: 50%;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.content-card,
.feature-item {
    background: white;
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 3px 10px rgba(87, 88, 88, 0.12);
}

.site-footer {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px 32px;
    color: #64748b;
    font-size: 0.9rem;
    text-align: center;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin-top: 24px;
    margin-bottom: 24px;
}

.detail-card h2,
.detail-card h3 {
    margin-top: 0;
}

.detail-card h3 {
    margin-bottom: 8px;
}

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

.detail-placeholder {
    color: #64748b;
    font-style: italic;
}

.detail-table-wrapper {
    overflow-x: auto;
}

.detail-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 420px;
}

.detail-table th,
.detail-table td {
    padding: 12px 14px;
    border-bottom: 1px solid #e2e8f0;
    text-align: left;
    vertical-align: top;
}

.detail-table th {
    color: #1e3a8a;
    font-size: 0.9rem;
}

.pill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 0;
    margin: 0;
    list-style: none;
}

.pill-list li {
    background: #eef2ff;
    color: #3730a3;
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 0.95rem;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.feature-item h3 {
    margin-top: 0;
    margin-bottom: 8px;
}

.timeline-section {
    margin-top: 12px;
}

.timeline {
    position: relative;
    width: min(1100px, 100%);
    margin: 0 auto;
}

.timeline-split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 70px minmax(0, 1fr);
    align-items: start;
    gap: 0;
    margin-bottom: 18px;
}

.timeline-column {
    display: flex;
    flex-direction: column;
}

.timeline-column-left {
    padding-right: 24px;
}

.timeline-column-right {
    padding-left: 24px;
}

.column-label {
    margin: 0 0 16px;
    font-size: 1.2rem;
    color: #1f2937;
    text-align: center;
}

.timeline-center-rail {
    position: relative;
    width: 4px;
    margin: 0 auto;
    min-height: 100%;
    background: linear-gradient(180deg, #2563eb, #c7d2fe);
    border-radius: 999px;
    overflow: visible;
}

.timeline-center-rail::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 18px;
    transform: translateX(-50%);
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #2563eb;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.timeline-item {
    position: relative;
    margin-bottom: 20px;
    width: 100%;
    display: block;
    opacity: 1;
    transform: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.timeline-item.is-visible {
    display: block;
    opacity: 1;
    transform: none;
}

.timeline-column-left .timeline-item {
    margin-right: 18px;
}

.timeline-column-right .timeline-item {
    margin-left: 18px;
}

.timeline-column-left .timeline-item::before,
.timeline-column-right .timeline-item::before {
    content: "";
    position: absolute;
    top: 22px;
    width: 14px;
    height: 14px;
    background: #2563eb;
    border: 3px solid #f8f9fa;
    border-radius: 50%;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.18);
}

.timeline-column-left .timeline-item::before {
    right: -18px;
}

.timeline-column-right .timeline-item::before {
    left: -18px;
}

.timeline-item-secondary {
    opacity: 0.96;
}

.timeline-content {
    background: white;
    border-radius: 18px;
    padding: 0;
    box-shadow: 0 3px 10px rgba(87, 88, 88, 0.12);
    overflow: hidden;
}

.timeline-card-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
    background: transparent;
    border: 0;
    padding: 20px 24px 14px;
    text-align: left;
    cursor: pointer;
    color: inherit;
    font: inherit;
}

.timeline-card-header:hover {
    background: #f8fafc;
}

.timeline-card-header:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: -2px;
}

.timeline-role {
    margin: 0 0 8px;
    color: #2563eb;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.72rem;
}

.timeline-content h3 {
    margin: 0;
    font-size: 1.15rem;
}

.timeline-date {
    white-space: nowrap;
    font-weight: 700;
    font-size: 0.9rem;
    color: #475569;
    background: #eff6ff;
    border-radius: 999px;
    padding: 7px 12px;
}

.timeline-body {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    padding: 0 24px;
    transition: max-height 0.45s ease, opacity 0.3s ease, padding 0.3s ease;
}

.timeline-item.is-expanded .timeline-body {
    opacity: 1;
    padding: 0 24px 22px;
}

.timeline-content ul {
    margin: 0 0 16px;
    padding-left: 18px;
}

.timeline-content li + li {
    margin-top: 8px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags span {
    display: inline-block;
    background: #eef2ff;
    color: #3730a3;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 999px;
    padding: 6px 10px;
}

.academic-subcards {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.academic-subcard {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 14px 16px;
}

.academic-subcard:only-child {
    grid-column: 1 / -1;
}

.academic-subcard h4 {
    margin: 0 0 8px;
    color: #1e3a8a;
    font-size: 0.92rem;
}

.academic-subcard ul {
    margin: 0;
    padding-left: 18px;
}

.academic-subcard:only-child ul {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 28px;
}

.academic-subcard li + li {
    margin-top: 5px;
}

.academic-subcard a {
    color: #1d4ed8;
    font-weight: 600;
}

.academic-subcard .btn {
    display: inline-block;
    margin-top: 2px;
    color: #111827;
    font-size: 0.85rem;
}

.timeline-actions {
    margin-top: 18px;
}

.timeline-actions .btn {
    display: inline-block;
    padding: 9px 16px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
}

@media (max-width: 800px) {
    .hero,
    .content-grid,
    .feature-list,
    .detail-grid,
    .timeline-split {
        grid-template-columns: 1fr;
    }

    .timeline-center-rail {
        display: none;
    }

    .timeline-column-left,
    .timeline-column-right {
        padding: 0;
    }

    .timeline-column-left .timeline-item,
    .timeline-column-right .timeline-item {
        margin-left: 0;
        margin-right: 0;
    }

    .timeline-column-left .timeline-item::before,
    .timeline-column-right .timeline-item::before {
        left: 12px;
        right: auto;
    }

    .hero-media {
        order: -1;
    }

    .profile-photo {
        margin: 0 auto 12px;
    }

    .timeline-card-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .timeline-date {
        white-space: normal;
    }

    .academic-subcards {
        grid-template-columns: 1fr;
    }

    .academic-subcard:only-child ul {
        grid-template-columns: 1fr;
    }

}