/* ==========================================================================
   isaacudy.com — DIRECTION 2B: "Swiss × brutalist, dark"
   Plain HTML + CSS. No JavaScript, no build step, no frameworks.
   Hand-editable. Shared across all pages.
   ========================================================================== */

:root {
    /* Palette --------------------------------------------------------------- */
    --bg:         #0e0d0b;   /* page background (near-black)          */
    --panel:      #16140f;   /* raised panel: code blocks, inline code */
    --ink:        #f2efe8;   /* primary text (warm off-white)         */
    --body:       #cbc7bd;   /* hero body copy                        */
    --body-2:     #b4b0a6;   /* card / section body copy              */
    --muted:      #928e84;   /* secondary text, nav, section labels   */
    --faint:      #6f6c63;   /* dates, venues, index counts           */
    --border:     #46423a;   /* every 2px structural line             */
    --hair:       #2a2823;   /* 1px hairlines inside the index card   */
    --blue:       #7ba0ff;   /* single accent: restrained blue        */

    /* Type ------------------------------------------------------------------ */
    --sans: 'Archivo', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

    --wrap: 72rem;
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: 4rem;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a { color: var(--blue); }

.wrap {
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 24px;
}

/* Shared section head ------------------------------------------------------ */
.section-label {
    display: flex;
    gap: 16px;
    align-items: baseline;
    margin-bottom: 12px;
}
.section-label .num { font: 600 13px var(--mono); color: var(--blue); }
.section-label .name {
    font: 500 11px var(--mono);
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--muted);
}
.section-h {
    margin: 0 0 10px;
    font: 700 38px/1.02 var(--sans);
    letter-spacing: -0.025em;
}
.section-intro {
    margin: 0 0 30px;
    /* Wrap at the same x-position as the first column's right border, so the
       intro follows the 2-column grid line all the way down the page. */
    max-width: 50%;
    font-size: 15px;
    color: var(--muted);
}
section { padding: 52px 0 0; }

/* --------------------------------------------------------------------------
   Nav
   -------------------------------------------------------------------------- */
.site-nav {
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--bg);
}
.site-nav .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 3.4rem;
}
.brand {
    font: 600 14px var(--mono);
    letter-spacing: -0.01em;
    color: var(--ink);
    text-decoration: none;
}
.site-nav ul {
    display: flex;
    gap: 22px;
    margin: 0; padding: 0;
    list-style: none;
}
.site-nav ul a {
    font: 500 11px var(--mono);
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--muted);
    text-decoration: none;
}
.site-nav ul a:hover { color: var(--ink); }
.site-nav ul a.is-contact { color: var(--blue); }

/* --------------------------------------------------------------------------
   Hero  — Swiss two-column: oversized name + bordered numbered index
   -------------------------------------------------------------------------- */
.hero { padding-top: 0; }
.hero .wrap {
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    border: 2px solid var(--border);
    border-top: none;
    padding: 0;
    max-width: var(--wrap);
}
.hero-main {
    padding: 56px 44px;
    border-right: 2px solid var(--border);
}
.eyebrow {
    margin: 0 0 24px;
    font: 500 11px var(--mono);
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--muted);
}
.hero-id {
    display: flex;
    align-items: center;
    gap: 24px;
    margin: 0 0 18px;
}
.hero-photo {
    /* Square photo sized to match the two-line name: 2 lines × 0.96 line-height
       × the h1's clamp() values. Bordered like everything else, no rounding. */
    width: clamp(5.76rem, 13.44vw, 8.832rem);
    aspect-ratio: 1;
    object-fit: cover;
    border: 2px solid var(--border);
    display: block;
}
.hero h1 {
    margin: 0;
    font: 800 clamp(3rem, 7vw, 4.6rem)/0.96 var(--sans);
    letter-spacing: -0.035em;
}
.hero .tagline {
    margin: 0 0 24px;
    font: 600 21px/1.3 var(--sans);
    letter-spacing: -0.01em;
    color: var(--blue);
}
.hero .intro {
    margin: 0 0 26px;
    max-width: 34rem;
    font-size: 16px;
    color: var(--body);
}
.hero .intro strong { font-weight: 700; color: var(--ink); }

.availability {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font: 500 11px var(--mono);
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--blue);
    border: 2px solid var(--border);
    padding: 8px 14px;
    margin-bottom: 28px;
}
.availability .dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--blue);
    animation: pulse 2.5s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .25; } }

.actions { display: flex; }
.btn {
    font: 600 13px var(--mono);
    padding: 14px 24px;
    text-decoration: none;
    border: 2px solid var(--border);
}
.btn.primary { background: var(--blue); border-color: var(--blue); color: var(--bg); }
.btn.secondary { color: var(--ink); border-left: none; }
.btn.secondary:hover { background: var(--blue); border-color: var(--blue); color: var(--bg); }

/* Hero index (replaces the terminal) */
.index { display: flex; flex-direction: column; }
.index-title {
    padding: 14px 28px;
    border-bottom: 2px solid var(--border);
    font: 500 11px var(--mono);
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--muted);
}
.index-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding: 16px 28px;
    border-bottom: 1px solid var(--hair);
    text-decoration: none;
}
.index-row:last-child { border-bottom: none; flex: 1; }
.index-row .rn { font: 500 12px var(--mono); color: var(--blue); margin-right: 14px; }
.index-row .rt { flex: 1; font: 700 17px var(--sans); color: var(--ink); }
.index-row .rc { font: 500 12px var(--mono); color: var(--faint); }
.index-row .rc.blue { color: var(--blue); }
.index-row:hover .rt { color: var(--blue); }

/* --------------------------------------------------------------------------
   Bordered grids (services, work, open source)  — brutalist shared borders
   -------------------------------------------------------------------------- */
.grid {
    border-top: 2px solid var(--border);
    border-left: 2px solid var(--border);
    display: grid;
    margin-bottom: 52px;
}
.grid.cols-2 { grid-template-columns: 1fr 1fr; }
.grid.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.cell {
    border-right: 2px solid var(--border);
    border-bottom: 2px solid var(--border);
    padding: 26px 28px;
}
.cell .cn { margin: 0 0 12px; font: 500 12px var(--mono); color: var(--blue); }
.cell h3 {
    margin: 0 0 10px;
    font: 700 21px var(--sans);
    letter-spacing: -0.01em;
}
.cell p { margin: 0; font-size: 14.5px; color: var(--body-2); }
.cell a { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; text-decoration-color: var(--border); }
.cell a:hover { text-decoration-color: var(--blue); }

/* Work cards */
.work h3 { font-size: 23px; }
.work h3 a { color: var(--ink); }
.chips { display: flex; gap: 8px; margin-bottom: 14px; }
.chip {
    font: 500 11px var(--mono);
    text-transform: uppercase;
    border: 1.5px solid var(--border);
    color: var(--body-2);
    padding: 2px 8px;
}
.chip.status { border-color: var(--blue); color: var(--blue); }

/* Open-source tag */
.os-tag {
    margin: 0 0 10px;
    font: 500 11px var(--mono);
    text-transform: uppercase;
    color: var(--blue);
}
.cell.os h3 { font-size: 19px; }
.cell.os p { font-size: 14px; }

/* --------------------------------------------------------------------------
   Talks — bordered list
   -------------------------------------------------------------------------- */
.talks {
    border-top: 2px solid var(--border);
    margin: 0 0 52px;
    padding: 0;
    list-style: none;
}
.talks li {
    display: grid;
    grid-template-columns: 4rem 1fr auto;
    gap: 22px;
    align-items: baseline;
    padding: 15px 4px;
    border-bottom: 2px solid var(--border);
}
.talks .year { font: 600 13px var(--mono); color: var(--faint); }
.talks .talk-title { font-weight: 700; font-size: 16px; color: var(--ink); }
.talks .venue { display: block; margin-top: 3px; font: 400 12px var(--mono); color: var(--muted); }
.talks .watch {
    font: 600 12px var(--mono);
    color: var(--blue);
    text-decoration: none;
    white-space: nowrap;
    border: 1.5px solid var(--blue);
    padding: 3px 9px;
}
.talks .watch:hover { background: var(--blue); color: var(--bg); }

/* Talks show-all toggle — CSS-only (checkbox state), no JavaScript.
   Visually-hidden checkbox stays keyboard-focusable; the label is the button. */
.talks-toggle {
    position: absolute;
    width: 1px; height: 1px;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}
.talks-toggle ~ .talks { margin-bottom: 18px; }
.talks-toggle ~ .talks li.extra { display: none; }
.talks-toggle:checked ~ .talks li.extra { display: grid; }
.talks-toggle-label {
    display: inline-block;
    font: 600 12px var(--mono);
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--ink);
    border: 1.5px solid var(--border);
    padding: 8px 16px;
    cursor: pointer;
    margin-bottom: 52px;
    user-select: none;
}
.talks-toggle-label:hover { background: var(--blue); border-color: var(--blue); color: var(--bg); }
.talks-toggle:focus-visible ~ .talks-toggle-label { outline: 2px solid var(--blue); outline-offset: 2px; }
.talks-toggle-label .less { display: none; }
.talks-toggle:checked ~ .talks-toggle-label .more { display: none; }
.talks-toggle:checked ~ .talks-toggle-label .less { display: inline; }

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.contact-box {
    border: 2px solid var(--border);
    padding: 48px 44px;
    margin-bottom: 44px;
}
.contact-box h2 { margin: 0 0 14px; font: 700 44px/1.0 var(--sans); letter-spacing: -0.03em; }
.contact-box p { margin: 0 0 24px; max-width: 40rem; font-size: 16px; color: var(--body-2); }
.contact-email {
    font: 700 clamp(1.4rem, 4vw, 1.9rem) var(--sans);
    letter-spacing: -0.02em;
    color: var(--blue);
    text-decoration: none;
    word-break: break-all;
}
.contact-email:hover { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 4px; }
.contact-links { display: flex; gap: 16px; margin-top: 22px; }
.contact-links a {
    font: 600 12px var(--mono);
    text-transform: uppercase;
    color: var(--ink);
    text-decoration: none;
    border: 1.5px solid var(--border);
    padding: 8px 16px;
}
.contact-links a:hover { background: var(--blue); border-color: var(--blue); color: var(--bg); }

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
    border-top: 2px solid var(--border);
}
.site-footer .wrap {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    padding: 20px 24px;
    font: 500 11px var(--mono);
    letter-spacing: .04em;
    color: var(--muted);
}
.site-footer a { color: var(--muted); text-decoration: underline; }

/* --------------------------------------------------------------------------
   Blog (currently hidden — styles carried into the 2B system for later)
   -------------------------------------------------------------------------- */
.post-list { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--border); }
.post-list li { padding: 20px 4px; border-bottom: 2px solid var(--border); }
.post-list .when { font: 500 12px var(--mono); color: var(--faint); }
.post-list h3 { margin: 6px 0 6px; font: 700 22px var(--sans); letter-spacing: -0.02em; }
.post-list p { margin: 0; color: var(--body-2); }
article.post { max-width: 44rem; margin: 0 auto; padding: 3rem 0; }
article.post h1 { font: 800 2.4rem var(--sans); letter-spacing: -0.03em; line-height: 1.05; }
article.post .post-meta { margin-bottom: 2rem; font: 500 13px var(--mono); color: var(--faint); }
article.post pre {
    background: var(--panel);
    border: 2px solid var(--border);
    padding: 1.25rem;
    overflow-x: auto;
    font: 400 13.5px/1.6 var(--mono);
    color: var(--ink);
}
article.post blockquote {
    margin: 1.5rem 0;
    padding: .25rem 0 .25rem 1.25rem;
    border-left: 3px solid var(--blue);
    color: var(--muted);
}
code {
    font: 400 .9em var(--mono);
    color: var(--blue);
    background: var(--panel);
    border: 1px solid var(--border);
    padding: .1em .35em;
}

/* --------------------------------------------------------------------------
   Responsive  — collapse to a single column, no horizontal scroll
   -------------------------------------------------------------------------- */
@media (max-width: 56rem) {
    .hero .wrap { grid-template-columns: 1fr; }
    .hero-main { border-right: none; border-bottom: 2px solid var(--border); padding: 40px 24px; }
    .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; }
    .talks li { grid-template-columns: 3.5rem 1fr; }
    .talks .watch { grid-column: 2; justify-self: start; margin-top: 4px; }
    .site-nav ul { gap: 12px; }
    .site-nav ul li.optional { display: none; }
    .section-intro { max-width: none; }
    section { padding: 36px 0 0; }
}

@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; }
    html { scroll-behavior: auto; }
}