/* ==========================================================================
   Crimson Theme - Crimson Pro body, Montserrat nav, teal accents
   Crafting Interpreters-style margin notes with absolute positioning
   ========================================================================== */

/* Diagram fonts - Tw Cen MT (local) + Architects Daughter (Google) */
@import url('https://fonts.googleapis.com/css2?family=Architects+Daughter&display=swap');

@font-face {
    font-family: "Tw Cen MT";
    src: url("/fonts/tw-cen-mt/Tw Cen MT.ttf") format("truetype");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

:root {
    --color-bg: #FAFAFA;
    --color-text: #111827;

    /* Accent: plum purple (from Jekyll theme) */
    --color-accent: #9C5284;
    --color-accent-dark: #7A3D66;
    /* Accent: teal (previous) */
    /* --color-accent: #0C6E72; */
    /* --color-accent-dark: #095456; */

    --color-grey: #6B7280;
    --color-grey-light: #8D8D8D;
    --color-border: #E5E7EB;
    --color-warm-bg: #FEF9E7;
    --color-warm-text: #111827;
    --color-selection: #E8C8DC;
    --color-link: #4B5563;
    --color-link-underline: #B0B0B0;

    --font-body: "Crimson Pro", Georgia, serif;
    --font-nav: "Montserrat", "Helvetica Neue", sans-serif;
    --font-code: Monaco, Consolas, "Courier New", monospace;

    /* Crafting Interpreters-inspired column system - widened 10% */
    --article-width: 700px;
    --aside-width: 250px;
    --aside-gap: 48px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
}

::selection {
    background: var(--color-selection);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1.2rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* Layout - center only the article width; sidenotes overflow right */
.site-container {
    max-width: var(--article-width);
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-container > main {
    flex: 1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-body);
    color: var(--color-text);
    line-height: 1.2;
}

h1 {
    font-size: 2.4rem;
    font-weight: 400;
    margin-top: 3rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1F2937;
    margin-top: 2.5rem;
    margin-bottom: 0.5rem;
}

h3 {
    font-size: 1.3rem;
    font-weight: 400;
    font-style: italic;
    margin-top: 2rem;
    margin-bottom: 0.5rem;
}

h4 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1.4rem;
}

p.subtitle {
    font-size: 1.3rem;
    font-style: italic;
    color: var(--color-grey);
    margin-top: -0.3rem;
    margin-bottom: 2rem;
}

/* Links - grey-blue with dashed underline; teal on hover */
a {
    color: var(--color-link);
    text-decoration: none;
    border-bottom: 1px dashed var(--color-link-underline);
    transition: color 0.15s ease, border-color 0.25s ease;
}

a:hover {
    color: var(--color-accent);
    border-bottom: 1px solid var(--color-accent);
}

/* Heading links - no underline */
h1 a, h2 a, h3 a, h4 a, h5 a, h6 a {
    color: inherit;
    border-bottom: none;
}

h1 a:hover, h2 a:hover, h3 a:hover,
h4 a:hover, h5 a:hover, h6 a:hover {
    color: var(--color-accent);
    border-bottom: none;
}

/* Horizontal Rule */
hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2.5rem 0;
}

/* ==========================================================================
   Topbar - Home page only (brand + nav)
   ========================================================================== */

.topbar {
    padding: 2.5rem 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 1rem;
}

.brand-block {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.brand-name {
    font-family: var(--font-nav);
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--color-text);
    text-decoration: none;
    border-bottom: none;
    letter-spacing: -0.01em;
}

.brand-name:hover {
    color: var(--color-accent);
    border-bottom: none;
}

.brand-title {
    font-family: var(--font-nav);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-grey);
    letter-spacing: 0.02em;
}

.topbar .nav-links {
    display: flex;
    gap: 2rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.4rem;
}

.topbar .nav-links a {
    font-family: var(--font-nav);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-grey);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: none;
}

.topbar .nav-links a:hover {
    color: var(--color-accent);
}

/* ==========================================================================
   Page Header - Inner pages (title + hamburger inline)
   ========================================================================== */

.page-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    margin-top: 4rem;
    position: relative;
}

.page-header .page-title {
    margin: 0;
    flex: 1;
}

/* Hamburger icon */
.hamburger {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    width: 24px;
    height: 18px;
    position: relative;
    flex-shrink: 0;
    margin-top: 0.4rem;
}

.hamburger span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-grey);
    transition: transform 0.25s ease, opacity 0.2s ease;
}

.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 8px; }
.hamburger span:nth-child(3) { top: 16px; }

.hamburger:hover span {
    background-color: var(--color-accent);
}

.hamburger.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Dropdown nav - positioned in the right margin, mirroring TOC on the left */
.nav-dropdown {
    display: none;
    position: absolute;
    right: calc(-1 * (var(--aside-width) + var(--aside-gap)));
    width: var(--aside-width);
    flex-direction: column;
    gap: 0.4rem;
    z-index: 100;
    /* top set by JS to match hamburger position */
}

.nav-dropdown.open {
    display: flex;
}

.nav-dropdown a {
    font-family: var(--font-nav);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-grey);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: none;
    padding: 0.15rem 0;
    white-space: nowrap;
}

.nav-dropdown a:hover,
.nav-dropdown a.active {
    color: var(--color-accent);
}

/* Narrow screens: nav-dropdown falls back to inline dropdown */
@media (max-width: 1099px) {
    .nav-dropdown {
        position: absolute;
        right: 0;
        top: 100%;
        width: auto;
        margin-top: 0.5rem;
        background: var(--color-bg);
        border: 1px solid var(--color-border);
        border-radius: 4px;
        padding: 0.8rem 1.5rem;
        box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    }
}

/* ==========================================================================
   Blog Post - top bar with back-link + TOC toggle + hamburger
   ========================================================================== */

.post-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 4rem;
    margin-bottom: 0.5rem;
    position: relative;
}

.post-topbar-right {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

/* TOC toggle icon - positioned outside main column on the left */
.toc-toggle {
    position: absolute;
    left: calc(-1 * var(--aside-gap));
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-grey-light);
    padding: 2px;
    display: inline-flex;
    align-items: center;
    transition: color 0.15s ease;
    z-index: 10;
    /* top set by JS to match title position */
}

.toc-toggle:hover,
.toc-toggle[aria-expanded="true"] {
    color: var(--color-accent);
}

/* ==========================================================================
   TOC Sidebar - left side, mirrors margin notes on right
   ========================================================================== */

/* TOC sidebar - same width/gap as margin notes, but on the left, fixed on scroll */
.toc-sidebar {
    display: none;
    position: fixed;
    left: calc(50% - var(--article-width) / 2 - var(--aside-width) - var(--aside-gap));
    width: var(--aside-width);
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
    z-index: 50;
    /* top is set by JS */
}

.toc-sidebar.open {
    display: block;
}

/* Narrow screens: hidden (no space) */
@media (max-width: 1099px) {
    .toc-sidebar,
    .toc-toggle {
        display: none !important;
    }
}

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

.toc-item {
    margin-bottom: 0.4rem;
}

.toc-item a {
    font-family: var(--font-nav);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-grey);
    border-bottom: none;
    display: block;
    padding: 0.15rem 0 0.15rem 0.6rem;
    border-left: 2px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
    line-height: 1.4;
}

.toc-item a:hover {
    color: var(--color-text);
    border-bottom: none;
}

.toc-h3 a {
    padding-left: 1.4rem;
    font-size: 0.7rem;
    color: var(--color-grey-light);
}

.toc-active a {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    font-weight: 500;
}

.post-back {
    font-family: var(--font-nav);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-grey);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-bottom: none;
}

.post-back:hover {
    color: var(--color-accent);
    border-bottom: none;
}

/* Blog post title - more top margin, same bottom gap as pages */
.post-title {
    margin-top: 3.5rem;
    margin-bottom: 0;
    position: relative;
}

.post-byline {
    font-family: var(--font-nav);
    font-size: 0.8rem;
    color: var(--color-grey-light);
    letter-spacing: 0.02em;
    margin-top: -1rem;
    margin-bottom: 2rem;
}

/* ==========================================================================
   Post Footer - date, tags, sharing, comments at bottom of post
   ========================================================================== */

.post-footer {
    margin-top: 3rem;
    border-top: 1px solid var(--color-border);
    padding-top: 2rem;
}

.post-meta-bottom {
    font-family: var(--font-nav);
    font-size: 0.85rem;
    color: var(--color-grey-light);
    letter-spacing: 0.02em;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.post-date {
    margin-right: 0.3rem;
}

.post-tag {
    font-family: var(--font-nav);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--color-grey-light);
    display: inline;
    margin-right: 0.5rem;
}

.post-tag::before {
    content: "#";
}

/* Author bio — direct traffic trap */
.author-bio {
    margin: 1.5rem 0 1.5rem;
    /* padding-top: 1.5rem;
    border-top: 1px solid var(--color-border); */
}

.author-bio p {
    font-family: var(--font-nav);
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--color-grey-light);
    margin: 0;
}

/* Sharing - icon buttons */
.post-share {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 3rem;
}

.share-icon {
    color: var(--color-grey-light);
    border-bottom: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    transition: color 0.15s ease, border-color 0.15s ease;
}

.share-icon:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    border-bottom: 1px solid var(--color-accent);
}

.share-icon svg {
    width: 14px;
    height: 14px;
}

/* Comments */
.post-comments {
    margin-top: 2rem;
}

.comments-toggle {
    font-family: var(--font-body);
    font-size: 1rem;
    font-style: italic;
    color: var(--color-grey-light);
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    border-bottom: 1px dashed var(--color-link-underline);
    transition: color 0.15s ease, border-color 0.15s ease;
}

.comments-toggle:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* ==========================================================================
   Hero (Home Page) - flowing prose
   ========================================================================== */

.hero {
    padding: 4.5rem 0 3rem;
}

.hero p {
    font-size: 1.3rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.hero .contact-links {
    margin-top: 3rem;
    font-family: var(--font-nav);
    font-size: 0.8rem;
    color: var(--color-grey);
    line-height: 1.8;
    letter-spacing: 0.02em;
}

.hero .contact-links a {
    color: var(--color-grey);
    border-bottom: none;
}

.hero .contact-links a:hover {
    color: var(--color-accent);
    border-bottom: none;
}

.hero .contact-links .separator {
    margin: 0 0.5rem;
    color: var(--color-grey-light);
}

/* ==========================================================================
   Content
   ========================================================================== */

.content {
    padding-bottom: 4rem;
    position: relative;
}

/* Page Title */
.page-title {
    font-size: 2.4rem;
    font-weight: 400;
    margin-top: 4rem;
    margin-bottom: 2rem;
    line-height: 1;
    color: var(--color-text);
}

.page-subtitle {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-grey);
    margin-top: 0.4rem;
    margin-bottom: 2.5rem;
}

/* Quote style subtitle — only in blog posts (after post-byline) */
.post-byline + .page-subtitle {
    padding-left: 1rem;
    border-left: 2px solid var(--color-border);
}

/* Role entries - h4 inside div, collapse gap to next paragraph */
.role-entry {
    margin-bottom: 0;
}

.role-entry h4 {
    margin-top: 1.5rem;
    margin-bottom: 0;
}

.role-entry + p {
    margin-top: 0.3rem;
}

.content .role-title {
    font-weight: 700;
    font-size: 1.15rem;
    display: block;
}

.content .role-period {
    font-style: italic;
    color: var(--color-grey);
    font-size: 0.95rem;
    display: block;
    margin-bottom: 0.4rem;
}

.content .client-list {
    font-size: 0.95rem;
    color: var(--color-grey);
    font-style: italic;
    margin-bottom: 1.4rem;
}

/* Fallback: collapse gap on p containing role-title */
.content p:has(> .role-title) {
    margin-bottom: 0.2rem;
}

/* ==========================================================================
   Margin Notes - Crafting Interpreters style
   Not italic, darker grey, wider
   ========================================================================== */

.marginnote {
    position: absolute;
    right: calc(-1 * (var(--aside-width) + var(--aside-gap)));
    width: var(--aside-width);
    font-family: var(--font-body);
    font-size: 0.85rem;
    line-height: 1.5;
    color: #4B5563;
    font-style: normal;
    border-top: 1px solid var(--color-border);
    padding-top: 0.4rem;
    transition: background-color 0.2s ease;
}

.marginnote a {
    border-bottom: none;
}

/* Linked sidenotes - dotted underline on phrases, yellow highlight on hover */
[data-note] {
    border-bottom: 1px dotted var(--color-grey-light);
    cursor: default;
    border-radius: 2px;
    padding: 0 1px;
    transition: background-color 0.2s ease;
}

h2 [data-note],
h4 [data-note] {
    border-bottom: none;
}

[data-note].highlight {
    background-color: #FEF9E7;
}

.marginnote.highlight {
    background-color: #FEF9E7;
}

/* Open Source List */
.oss-list {
    list-style: none;
    padding: 0;
}

.oss-list li {
    margin-bottom: 1.2rem;
    padding-left: 0;
    line-height: 1.6;
}

.oss-list li:not(:first-child) {
    margin-top: 0;
}

.oss-list .project-name {
    font-weight: 700;
}

/* Writing Page */
.upcoming-post {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-grey);
    font-size: 1.1rem;
    font-style: italic;
}

.upcoming-post:last-child {
    border-bottom: none;
}

.upcoming-label {
    font-family: var(--font-nav);
    font-size: 0.65rem;
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-grey-light);
    margin-left: 0.8rem;
}

.writing-post {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.1rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.writing-post a {
    border-bottom: none;
}

.writing-post a:hover {
    color: var(--color-accent);
}

.writing-date {
    font-family: var(--font-nav);
    font-size: 0.75rem;
    color: var(--color-grey-light);
    letter-spacing: 0.02em;
    white-space: nowrap;
    flex-shrink: 0;
}

/* Contact Page */
.contact-list {
    list-style: none;
    padding: 0;
    font-size: 1.2rem;
}

.contact-list li {
    margin-bottom: 1.2rem;
}

.contact-list .label {
    font-family: var(--font-nav);
    color: var(--color-grey);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    display: block;
    margin-bottom: 0.15rem;
}

/* Blockquote */
blockquote {
    font-style: italic;
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--color-grey);
    margin: 2rem 0;
    padding-left: 1rem;
    border-left: 2px solid var(--color-border);
}

/* Figure & Caption */
figure {
    margin: 2rem 0;
    padding: 0;
}

figure img {
    max-width: 100%;
    height: auto;
    display: block;
}

figcaption {
    font-family: var(--font-nav);
    font-size: 0.75rem;
    color: var(--color-grey-light);
    margin-top: 0.5rem;
    line-height: 1.4;
    letter-spacing: 0.01em;
}

/* KaTeX - match body text size */
.katex {
    font-size: 1em !important;
}

/* Code */
code {
    font-family: var(--font-code);
    font-size: 0.95rem;
    color: var(--color-warm-text);
    padding: 2px 4px;
    background: #F9F7F6;
    border-radius: 3px;
}

pre {
    background: #F9F7F6;
    border-radius: 3px;
    padding: 1rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    line-height: 1.4;
    border: 1px dashed #666;
}

pre code {
    font-size: 0.85rem;
    padding: 0;
    background: none;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    padding: 2rem 0 3rem;
    border-top: 1px solid var(--color-border);
    margin-top: 3rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-footer .copyright {
    font-family: var(--font-nav);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-grey-light);
}

.site-footer .footer-links {
    display: flex;
    gap: 1.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-footer .footer-links a {
    font-family: var(--font-nav);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-grey-light);
    text-decoration: none;
    border-bottom: none;
}

.site-footer .footer-links a:hover {
    color: var(--color-accent);
    border-bottom: none;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1060px) {
    .marginnote {
        position: relative;
        right: auto;
        width: auto;
        display: block;
        margin: 0.5rem 0 1rem 0;
        padding-left: 1rem;
        border-top: none;
        border-left: 1px solid var(--color-border);
        padding-top: 0;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 1.1rem;
    }

    .topbar {
        padding: 1.5rem 0 1rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .topbar .nav-links {
        gap: 1.2rem;
    }

    .topbar .nav-links a {
        font-size: 0.75rem;
    }

    .brand-name {
        font-size: 1.2rem;
    }

    .page-header {
        margin-top: 2rem;
    }

    .post-topbar {
        margin-top: 2rem;
    }

    .hero {
        padding: 2.5rem 0 2rem;
    }

    .hero p {
        font-size: 1.15rem;
        line-height: 1.7;
    }

    h1, .page-title {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.3rem;
    }

    .site-footer {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .site-footer .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .site-container {
        padding: 0 1rem;
    }

    .topbar .nav-links {
        gap: 0.8rem;
    }

    .brand-name {
        font-size: 1.1rem;
    }
}

/* Print */
@media print {
    body {
        color: #000;
        background: #fff;
        overflow-x: visible;
    }

    .topbar,
    .hamburger,
    .nav-dropdown,
    .post-topbar .hamburger,
    .site-footer {
        display: none;
    }

    a {
        color: #000;
        border-bottom: none;
    }

    .content a::after {
        content: " (" attr(href) ")";
        font-size: 0.8rem;
        color: #666;
    }

    .marginnote {
        position: relative;
        right: auto;
        display: block;
        width: auto;
        margin: 0.5rem 0;
    }
}