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

:root {
    --bg-color: #000000;
    --text-color: #ffffff;
    --border-color: rgba(255, 255, 255, 0.12);
    --muted-color: rgba(255, 255, 255, 0.5);
}

[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #000000;
    --border-color: rgba(0, 0, 0, 0.12);
    --muted-color: rgba(0, 0, 0, 0.5);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: Georgia, 'Times New Roman', Times, serif;
    line-height: 1.8;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 40px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 100px;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    font-size: 2.5rem;
    font-weight: 400;
    letter-spacing: -0.02em;
}

.logo a {
    color: var(--text-color);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.logo a:hover {
    opacity: 0.7;
}

nav {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: opacity 0.2s ease;
}

nav a:hover {
    text-decoration: underline;
    opacity: 0.7;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 0.95rem;
    cursor: pointer;
    font-family: Georgia, 'Times New Roman', Times, serif;
    transition: opacity 0.2s ease;
}

.theme-toggle:hover {
    opacity: 0.7;
}

/* Main Content */
main {
    margin-bottom: 100px;
}

main p {
    margin-bottom: 40px;
    font-size: 1.05rem;
}

main a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid var(--text-color);
    transition: opacity 0.2s ease;
}

main a:hover {
    text-decoration: underline;
    opacity: 0.7;
}

.intro {
    margin-bottom: 72px;
}

/* Resume-style sections */
section {
    margin-bottom: 64px;
}

.section-title {
    font-size: 0.85rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--muted-color);
    padding-bottom: 10px;
    margin-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

/* Entries — one job, project, or degree */
.entry {
    margin-bottom: 48px;
}

.entry:last-child {
    margin-bottom: 0;
}

.entry-tight {
    margin-bottom: 28px;
}

.entry-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    flex-wrap: wrap;
}

.entry-head h3 {
    font-size: 1.25rem;
    font-weight: 400;
    letter-spacing: -0.01em;
}

.entry-date {
    font-size: 0.85rem;
    color: var(--muted-color);
    white-space: nowrap;
}

.entry-sub {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.95rem;
    font-style: italic;
    color: var(--muted-color);
    margin-top: 4px;
}

.entry-place {
    white-space: nowrap;
}

.entry-sub-single {
    font-size: 0.95rem;
    font-style: italic;
    color: var(--muted-color);
    margin: 4px 0 0;
}

.entry-head + .work-list,
.entry-sub + .work-list,
.entry-sub-single + .work-list {
    margin-top: 20px;
}

.project-link {
    margin-top: 16px;
    margin-bottom: 0;
    font-size: 0.95rem;
}

.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px 32px;
    margin-top: 24px;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.tech-group h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted-color);
    font-weight: 400;
    margin-bottom: 6px;
}

.tech-group p {
    font-size: 0.9rem;
    margin-bottom: 0;
    line-height: 1.6;
}

.status-tag {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--muted-color);
    border: 1px solid var(--border-color);
    padding: 2px 8px;
    margin-left: 10px;
    vertical-align: middle;
    white-space: nowrap;
}

/* Skills */
.skills {
    display: grid;
    grid-template-columns: minmax(0, 15rem) 1fr;
    gap: 16px 32px;
}

.skills dt {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted-color);
    line-height: 1.6;
    padding-top: 0.2em;
}

.skills dd {
    font-size: 0.95rem;
    line-height: 1.7;
}

.outro {
    margin-top: 72px;
}

.work-list {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.work-list li {
    position: relative;
    padding-left: 20px;
    padding-bottom: 12px;
    font-size: 0.95rem;
    line-height: 1.7;
}

.work-list li:last-child {
    padding-bottom: 0;
}

.work-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--muted-color);
}

.contact {
    margin-top: 60px;
    font-size: 1.05rem;
}

/* Books page — Page Title */
.page-title {
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: -0.01em;
    margin-bottom: 48px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.title-tag {
    font-size: 0.65em;
    color: var(--muted-color);
    margin-left: 12px;
}

/* Books page — Book List */
.book-list {
    list-style: none;
    counter-reset: books;
}

.book-list li {
    counter-increment: books;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 16px;
    align-items: baseline;
}

.book-list li:first-child {
    padding-top: 0;
}

.book-list li::before {
    content: counter(books, decimal-leading-zero);
    font-size: 0.8rem;
    color: var(--muted-color);
    letter-spacing: 0.05em;
    flex-shrink: 0;
    min-width: 24px;
}

.book-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.book-title {
    font-size: 1.05rem;
    font-style: italic;
}

.book-author {
    font-size: 0.9rem;
    color: var(--muted-color);
}

.book-note {
    font-size: 0.8rem;
    color: var(--muted-color);
    opacity: 0.7;
}

/* Footer */
footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    opacity: 0.7;
    flex-wrap: wrap;
    gap: 20px;
}

/* Books footer needs extra top spacing (no preceding border block) */
.footer-spaced {
    margin-top: 80px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 40px 24px;
    }

    header {
        margin-bottom: 60px;
    }

    .logo {
        font-size: 2rem;
    }

    nav {
        gap: 16px;
    }

    main p {
        font-size: 1rem;
        margin-bottom: 32px;
    }

    .intro,
    .outro {
        margin-bottom: 56px;
    }

    .outro {
        margin-top: 56px;
    }

    section {
        margin-bottom: 56px;
    }

    .entry-head h3 {
        font-size: 1.15rem;
    }

    .tech-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .skills {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .skills dd:not(:last-child) {
        margin-bottom: 16px;
    }

    footer {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    nav {
        width: 100%;
        justify-content: flex-start;
    }

    .tech-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .entry-head,
    .entry-sub {
        gap: 2px;
    }

    .entry-date,
    .entry-place {
        white-space: normal;
    }

    footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}