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

:root {
    --color-bg: #fafaf9;
    --color-surface: #ffffff;
    --color-text: #1c1917;
    --color-text-secondary: #57534e;
    --color-text-muted: #78716c;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-accent-light: #eff6ff;
    --color-border: #e7e5e4;
    --color-tag-bg: #f5f5f4;
    --color-tag-border: #d6d3d1;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

/* Top navigation */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(250, 250, 249, 0.85);
    backdrop-filter: saturate(180%) blur(8px);
    -webkit-backdrop-filter: saturate(180%) blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.site-nav-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.site-nav-brand {
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    color: var(--color-text);
    text-decoration: none;
}

.site-nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-nav-links a {
    display: inline-block;
    padding: 6px 12px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}

.site-nav-links a:hover {
    color: var(--color-text);
    background: var(--color-tag-bg);
}

.site-nav-links a.active {
    color: var(--color-accent);
    background: var(--color-accent-light);
}

/* Visitor counter */
.visitor-counter {
    position: fixed;
    bottom: 16px;
    right: 16px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    padding: 4px 12px;
    z-index: 10;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

/* Hero (landing) */
.hero {
    padding: 56px 0 32px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 24px;
}

/* Latest writing strip (landing) */
.latest-post {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 16px;
    margin-bottom: 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: border-color 0.15s, background 0.15s;
}

.latest-post:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
}

.latest-post-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    padding: 3px 9px;
    background: var(--color-accent-light);
    border-radius: 999px;
    flex-shrink: 0;
}

.latest-post-title {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-text);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.latest-post-date {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
    flex-shrink: 0;
}

.latest-post-arrow {
    color: var(--color-accent);
    flex-shrink: 0;
}

.hero-eyebrow {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 16px;
}

.hero h1 .accent {
    color: var(--color-accent);
}

.hero-lead {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 620px;
    margin-bottom: 28px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    text-decoration: none;
    transition: opacity 0.15s, background 0.15s, color 0.15s, border-color 0.15s;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--color-accent);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-tag-bg);
}

/* Header (resume page) */
header.resume-header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 24px;
}

header.resume-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.contact-info a {
    color: var(--color-accent);
    text-decoration: none;
}

.contact-info a:hover {
    text-decoration: underline;
}

.separator::after {
    content: "\00b7";
    color: var(--color-tag-border);
    font-weight: 700;
}

/* Sections */
section {
    margin-bottom: 36px;
}

section > h2 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 6px;
    margin-bottom: 20px;
}

section > p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

/* Entry blocks */
.entry {
    margin-bottom: 24px;
}

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

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 8px;
}

.entry-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
}

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

.entry-meta {
    text-align: right;
    flex-shrink: 0;
}

.location {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.date {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-style: italic;
}

.project-link {
    font-size: 0.9rem;
    color: var(--color-accent);
    text-decoration: none;
}

.project-link:hover {
    text-decoration: underline;
}

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

ul li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 6px;
    font-size: 0.92rem;
    color: var(--color-text-secondary);
}

ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-accent);
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.skill-category h3 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.82rem;
    background: var(--color-tag-bg);
    border: 1px solid var(--color-tag-border);
    border-radius: 4px;
    color: var(--color-text-secondary);
}

/* Project cards (landing) */
.project-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.project-card {
    display: block;
    padding: 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}

.project-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.project-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 8px;
}

.project-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.project-card-link {
    font-size: 0.85rem;
    color: var(--color-accent);
    flex-shrink: 0;
}

.project-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.project-card .skill-tags {
    gap: 6px;
}

/* Page header (inner pages) */
.page-header {
    padding: 40px 0 32px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 36px;
}

.page-header-eyebrow {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: 14px;
}

.page-header p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 620px;
}

/* Project list (projects page) */
.project-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.project-entry {
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
}

.project-entry:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.project-entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.project-entry-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--color-text);
    margin-bottom: 4px;
}

.project-meta {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
}

.project-entry-links {
    display: flex;
    gap: 14px;
    flex-shrink: 0;
}

.project-entry-links a {
    font-size: 0.9rem;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.project-entry-links a:hover {
    text-decoration: underline;
}

.project-entry p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 14px;
}

.project-entry code {
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.85em;
    padding: 1px 6px;
    background: var(--color-tag-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
}

.project-entry .skill-tags {
    margin-top: 4px;
}

/* Blog index */
.blog-list {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.blog-entry {
    padding-bottom: 28px;
    border-bottom: 1px solid var(--color-border);
}

.blog-entry:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.blog-entry-date {
    font-size: 0.82rem;
    color: var(--color-text-muted);
    font-variant-numeric: tabular-nums;
    margin-bottom: 6px;
}

.blog-entry h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
}

.blog-entry h2 a {
    color: var(--color-text);
    text-decoration: none;
}

.blog-entry h2 a:hover {
    color: var(--color-accent);
}

.blog-entry p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.blog-entry-read {
    font-size: 0.88rem;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.blog-entry-read:hover {
    text-decoration: underline;
}

/* Article (blog post) */
.article {
    max-width: 720px;
    margin: 0 auto;
}

.article-back {
    display: inline-block;
    margin-top: 16px;
    margin-bottom: 24px;
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    text-decoration: none;
}

.article-back:hover {
    color: var(--color-accent);
}

.article-header {
    margin-bottom: 36px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.article-meta {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    font-variant-numeric: tabular-nums;
}

.article-meta .separator::after {
    margin: 0 6px;
}

.article-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.article-body h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-top: 36px;
    margin-bottom: 14px;
    color: var(--color-text);
}

.article-body h3 {
    font-size: 1.02rem;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 10px;
    color: var(--color-text);
}

.article-body p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.article-body p strong {
    color: var(--color-text);
    font-weight: 600;
}

.article-body ol,
.article-body ul.prose-list {
    padding-left: 20px;
    margin-bottom: 16px;
}

.article-body ol li,
.article-body ul.prose-list li {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    padding-left: 4px;
    line-height: 1.7;
}

.article-body ol li::before,
.article-body ul.prose-list li::before {
    content: none;
}

.article-body ol li {
    list-style: decimal;
}

.article-body ul.prose-list li {
    list-style: disc;
}

.article-body code {
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.88em;
    padding: 1px 6px;
    background: var(--color-tag-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
}

.article-body pre {
    background: #0f172a;
    color: #e2e8f0;
    padding: 18px 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 20px;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.78rem;
    line-height: 1.55;
}

.article-body pre code {
    background: transparent;
    border: none;
    color: inherit;
    padding: 0;
    font-size: inherit;
}

.article-body blockquote {
    border-left: 3px solid var(--color-accent);
    padding: 4px 0 4px 16px;
    margin-bottom: 16px;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Diagram (Mermaid in article body) */
.article-body .diagram {
    background: #f4f6fa;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 24px;
    margin: 24px 0 28px;
    text-align: center;
    overflow-x: auto;
    width: min(100vw - 32px, 1100px);
    position: relative;
    left: 50%;
    transform: translateX(-50%);
}

.article-body .diagram pre.mermaid {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
    color: inherit;
    text-align: center;
    line-height: 1.3;
    font-size: 0.85rem;
    overflow: visible;
}

.article-body .diagram pre.mermaid svg {
    width: 100% !important;
    max-width: 100% !important;
    height: auto !important;
}

.diagram-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 22px;
    justify-content: center;
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px dashed var(--color-border);
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.diagram-legend > div {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-line {
    display: inline-block;
    width: 38px;
    height: 0;
}

.legend-line.solid {
    border-top: 2px solid var(--color-accent);
}

.legend-line.dashed {
    border-top: 2px dashed var(--color-accent);
}

.legend-line.thick {
    border-top: 4px solid var(--color-accent);
}

/* Coming soon */
.coming-soon {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    padding: 48px 24px;
}

.coming-soon-eyebrow {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 12px;
}

.coming-soon h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.coming-soon p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 440px;
    margin-bottom: 28px;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    margin-top: 48px;
    padding: 24px 24px 32px;
    text-align: center;
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.site-footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.site-footer a:hover {
    color: var(--color-accent);
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 24px 16px 48px;
    }

    .site-nav-inner {
        padding: 12px 16px;
    }

    .site-nav-links a {
        padding: 6px 8px;
        font-size: 0.85rem;
    }

    .hero {
        padding: 40px 0 28px;
        margin-bottom: 20px;
    }

    .latest-post {
        gap: 10px;
        padding: 10px 12px;
        margin-bottom: 32px;
    }

    .latest-post-date {
        display: none;
    }

    .hero h1 {
        font-size: 1.9rem;
    }

    .hero-lead {
        font-size: 0.98rem;
    }

    header.resume-header h1 {
        font-size: 1.6rem;
    }

    .entry-header {
        flex-direction: column;
    }

    .entry-meta {
        text-align: left;
    }

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

    .coming-soon h1 {
        font-size: 1.8rem;
    }

    .page-header {
        padding: 28px 0 24px;
        margin-bottom: 28px;
    }

    .page-header h1 {
        font-size: 1.7rem;
    }

    .project-entry-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* 404 page */
.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
    text-align: center;
}

.error-code {
    font-size: 6rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: 12px;
}

.error-message {
    font-size: 1.2rem;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.back-link {
    display: inline-block;
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #ffffff;
    background: var(--color-accent);
    border-radius: 6px;
    text-decoration: none;
    transition: opacity 0.2s;
}

.back-link:hover {
    opacity: 0.85;
}

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

    .container {
        max-width: 100%;
        padding: 0;
    }

    .site-nav,
    .visitor-counter,
    .site-footer {
        display: none;
    }

    section > h2 {
        color: var(--color-text);
        border-color: var(--color-text);
    }

    .contact-info a {
        color: var(--color-text);
    }

    .tag {
        border-color: var(--color-border);
    }
}