/* =============================================================================
   vinayrajusanniboina.com

   One stylesheet, no framework, no build step. Organised top to bottom:
     1. Tokens          design decisions expressed as custom properties
     2. Reset           the small amount of normalising that is worth doing
     3. Typography      a clamp() scale so nothing needs media queries to resize
     4. Layout          wrappers, header, footer
     5. Components      cards, tables, decisions, calculations, gallery, viewer
     6. Pages           home, projects index, project detail, about, cv, contact
     7. States          focus, reduced motion, print

   Editing note: change the accent in one place (--accent, light and dark) and the
   whole site follows.
   ========================================================================== */

/* ----------------------------------------------------------------------------
   1. TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* Type. Sans for interface and headings, serif for long-form prose, mono for
     anything that is data: numbers, labels, checksums, units. That pairing is the
     whole typographic idea — it reads like a technical document rather than a
     marketing page, and costs zero network requests. */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia,
                "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono",
               "Roboto Mono", Menlo, Consolas, monospace;

  /* Fluid type scale, 1.25 ratio, min at 360px viewport and max at 1280px. */
  --step--1: clamp(0.80rem, 0.77rem + 0.14vw, 0.875rem);
  --step-0:  clamp(1.00rem, 0.96rem + 0.18vw, 1.0625rem);
  --step-1:  clamp(1.20rem, 1.12rem + 0.36vw, 1.375rem);
  --step-2:  clamp(1.44rem, 1.30rem + 0.63vw, 1.75rem);
  --step-3:  clamp(1.73rem, 1.50rem + 1.03vw, 2.25rem);
  --step-4:  clamp(2.07rem, 1.71rem + 1.61vw, 2.94rem);
  --step-5:  clamp(2.49rem, 1.94rem + 2.45vw, 3.75rem);

  /* Spacing, on a 4px grid */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  --measure: 68ch;          /* comfortable reading width for prose */
  --wrap: 74rem;            /* page maximum */
  --wrap-narrow: 50rem;
  --radius: 3px;            /* almost square: drawing-office, not app-store */
  --radius-lg: 5px;
  --border: 1px;

  --transition: 160ms cubic-bezier(0.2, 0, 0.2, 1);

  /* Light theme (default) */
  --bg: #fbfaf8;
  --bg-alt: #f3f1ed;
  --surface: #ffffff;
  --surface-2: #f7f5f2;
  --text: #16191c;
  --text-2: #3c444d;
  --muted: #667180;
  --line: #ddd9d3;
  --line-strong: #c3bdb5;
  --accent: #b23c0c;
  --accent-hover: #8f300a;
  --accent-soft: #fdf1ea;
  --accent-line: #e8c4ae;
  --ok: #1f6b3f;
  --warn: #8a5a00;
  --shadow: 0 1px 2px rgb(20 25 30 / 6%), 0 8px 24px rgb(20 25 30 / 5%);
  --shadow-lift: 0 2px 4px rgb(20 25 30 / 8%), 0 16px 40px rgb(20 25 30 / 10%);
  --selection: #f6d9c8;
}

/* Dark theme, chosen by the OS unless the visitor has toggled it. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1114;
    --bg-alt: #14171b;
    --surface: #171a1f;
    --surface-2: #1d2126;
    --text: #e9eaec;
    --text-2: #c2c7cd;
    --muted: #939ba5;
    --line: #272c33;
    --line-strong: #3a4149;
    --accent: #ff7a45;
    --accent-hover: #ff9a6e;
    --accent-soft: #24170f;
    --accent-line: #4a2c1a;
    --ok: #59c98a;
    --warn: #e0a94a;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 8px 24px rgb(0 0 0 / 30%);
    --shadow-lift: 0 2px 4px rgb(0 0 0 / 50%), 0 16px 40px rgb(0 0 0 / 45%);
    --selection: #4a2c1a;
  }
}

/* Manual override wins over the OS in both directions. */
:root[data-theme="dark"] {
  --bg: #0f1114;
  --bg-alt: #14171b;
  --surface: #171a1f;
  --surface-2: #1d2126;
  --text: #e9eaec;
  --text-2: #c2c7cd;
  --muted: #939ba5;
  --line: #272c33;
  --line-strong: #3a4149;
  --accent: #ff7a45;
  --accent-hover: #ff9a6e;
  --accent-soft: #24170f;
  --accent-line: #4a2c1a;
  --ok: #59c98a;
  --warn: #e0a94a;
  --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 8px 24px rgb(0 0 0 / 30%);
  --shadow-lift: 0 2px 4px rgb(0 0 0 / 50%), 0 16px 40px rgb(0 0 0 / 45%);
  --selection: #4a2c1a;
}

/* ----------------------------------------------------------------------------
   2. RESET
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;   /* so anchor targets clear the sticky header */
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
img { background: var(--surface-2); }

h1, h2, h3, h4 { margin: 0; line-height: 1.15; text-wrap: balance; font-weight: 620; }
p, ul, ol, dl, figure, table, pre { margin: 0; }

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent); }

button { font: inherit; color: inherit; }
::selection { background: var(--selection); }

svg.icon { width: 1.15em; height: 1.15em; fill: none; stroke: currentColor;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.icon-inline { display: inline-block; vertical-align: -0.2em; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: var(--space-4); top: -4rem; z-index: 100;
  background: var(--accent); color: #fff; padding: var(--space-3) var(--space-4);
  border-radius: var(--radius); text-decoration: none; font-weight: 600;
  transition: top var(--transition);
}
.skip-link:focus { top: var(--space-4); color: #fff; }

/* ----------------------------------------------------------------------------
   3. TYPOGRAPHY
   -------------------------------------------------------------------------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.86em;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}
.num { font-variant-numeric: tabular-nums; text-align: right; }
.muted { color: var(--muted); }

/* Long-form prose: serif, narrow measure. Only inside .prose, so interface text
   stays sans. */
.prose {
  font-family: var(--font-serif);
  font-size: 1.06em;
  line-height: 1.7;
  max-width: var(--measure);
  color: var(--text-2);
}
.prose > * + * { margin-top: var(--space-4); }
.prose h3 { font-family: var(--font-sans); font-size: var(--step-1); margin-top: var(--space-6); }
.prose h4 { font-family: var(--font-sans); font-size: var(--step-0); margin-top: var(--space-5); }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li + li { margin-top: var(--space-2); }
.prose strong { color: var(--text); font-weight: 650; }
.prose a { color: var(--accent); text-decoration: underline; }
.prose code {
  font-family: var(--font-mono); font-size: 0.85em;
  background: var(--surface-2); padding: 0.1em 0.35em;
  border: var(--border) solid var(--line); border-radius: var(--radius);
}
.prose blockquote {
  margin: 0; padding-left: var(--space-4);
  border-left: 3px solid var(--accent-line); color: var(--muted); font-style: italic;
}
.prose table { font-family: var(--font-sans); font-size: var(--step--1); }

/* ----------------------------------------------------------------------------
   4. LAYOUT
   -------------------------------------------------------------------------- */
.wrap {
  width: min(100% - 2 * var(--space-5), var(--wrap));
  margin-inline: auto;
}
.wrap.narrow { width: min(100% - 2 * var(--space-5), var(--wrap-narrow)); }

.section { padding-block: var(--space-8); }
.section-alt { background: var(--bg-alt); border-block: var(--border) solid var(--line); }
.section-head { margin-bottom: var(--space-6); }
.section-head h2 { font-size: var(--step-3); letter-spacing: -0.015em; }
.section-lede { margin-top: var(--space-3); max-width: var(--measure); color: var(--muted); }
.section-note { margin-top: var(--space-3); color: var(--muted); font-size: var(--step--1); max-width: var(--measure); }
.section-more { margin-top: var(--space-6); }

.page-head { padding-block: var(--space-8) var(--space-6); }
.page-head h1 { font-size: var(--step-4); letter-spacing: -0.025em; }
.page-lede { margin-top: var(--space-4); max-width: var(--measure); color: var(--muted); font-size: var(--step-1); line-height: 1.5; }

.two-col {
  display: grid; gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  margin-top: var(--space-5);
}

/* --- Header --- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: var(--border) solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: var(--space-5);
  min-height: 4.25rem;
}
.brand { display: grid; text-decoration: none; margin-right: auto; }
.brand-name { font-weight: 650; letter-spacing: -0.015em; line-height: 1.2; }
.brand-role {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted);
  letter-spacing: 0.02em; text-transform: uppercase;
}
.brand:hover .brand-name { color: var(--accent); }

.site-nav { display: flex; align-items: center; }
.nav-list { display: flex; gap: var(--space-5); list-style: none; padding: 0; }
.nav-list a {
  text-decoration: none; font-size: var(--step--1); font-weight: 550;
  color: var(--text-2); padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
}
.nav-list a:hover { color: var(--accent); }
.nav-list a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent); }

.nav-toggle { display: none; background: none; border: 0; padding: var(--space-2); cursor: pointer; }
.nav-toggle-bars { display: grid; gap: 4px; width: 20px; }
.nav-toggle-bars span { height: 2px; background: currentColor; border-radius: 2px; transition: var(--transition); }

.theme-toggle {
  display: grid; place-items: center; width: 2.25rem; height: 2.25rem;
  background: none; border: var(--border) solid var(--line);
  border-radius: var(--radius); cursor: pointer; color: var(--text-2);
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: none; }
  :root:not([data-theme="light"]) .icon-moon { display: block; }
}

@media (max-width: 44rem) {
  .nav-toggle { display: block; order: 2; }
  .nav-list {
    position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: 0;
    background: var(--surface); border-bottom: var(--border) solid var(--line);
    padding: var(--space-3) var(--space-5) var(--space-5);
    box-shadow: var(--shadow);
  }
  .nav-list:not(.is-open) { display: none; }
  .nav-list li { border-top: var(--border) solid var(--line); }
  .nav-list a { display: block; padding: var(--space-4) 0; border-bottom: 0; }
  .brand-role { display: none; }
}

/* --- Footer --- */
.site-footer {
  margin-top: var(--space-9);
  border-top: var(--border) solid var(--line);
  background: var(--bg-alt);
  padding-block: var(--space-7) var(--space-5);
}
.footer-inner {
  display: grid; gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
}
.footer-name { font-weight: 650; }
.footer-role { color: var(--text-2); font-size: var(--step--1); }
.footer-loc { color: var(--muted); margin-top: var(--space-1); }
.footer-heading {
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--muted); font-weight: 500; margin-bottom: var(--space-3);
}
.footer-links { list-style: none; padding: 0; display: grid; gap: var(--space-2); }
.footer-links a { text-decoration: none; color: var(--text-2); font-size: var(--step--1); }
.footer-links a:hover { color: var(--accent); text-decoration: underline; }
.footer-legal { margin-top: var(--space-7); padding-top: var(--space-4);
  border-top: var(--border) solid var(--line); color: var(--muted); }

/* ----------------------------------------------------------------------------
   5. COMPONENTS
   -------------------------------------------------------------------------- */

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: 0.6rem 1.1rem;
  border: var(--border) solid var(--line-strong); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  font-size: var(--step--1); font-weight: 550; text-decoration: none;
  cursor: pointer; transition: var(--transition);
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn-primary {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
:root[data-theme="dark"] .btn-primary { color: #1a0d06; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .btn-primary { color: #1a0d06; }
}
.cta-row { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-5); }
.link-arrow { color: var(--accent); font-weight: 550; text-decoration: none; }
.link-arrow:hover { text-decoration: underline; }
.link-button { background: none; border: 0; padding: 0; color: var(--accent);
  text-decoration: underline; cursor: pointer; }

/* --- Tags and pills --- */
.tag-list { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; padding: 0; }
.tag {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.03em;
  text-transform: uppercase; padding: 0.22rem 0.5rem;
  border: var(--border) solid var(--line); border-radius: var(--radius);
  color: var(--muted); background: var(--surface);
}
.pill-list { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; padding: 0;
  margin-top: var(--space-3); }
.pill-list li {
  font-size: var(--step--1); padding: 0.25rem 0.6rem;
  background: var(--surface-2); border: var(--border) solid var(--line);
  border-radius: var(--radius); color: var(--text-2);
}

/* --- Cards --- */
.card-grid {
  display: grid; gap: var(--space-5);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
}
.card {
  background: var(--surface); border: var(--border) solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: var(--transition); display: flex;
}
.card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.card[hidden] { display: none; }
.card-link { display: flex; flex-direction: column; text-decoration: none; width: 100%; }
.card-media { aspect-ratio: 16 / 10; overflow: hidden; border-bottom: var(--border) solid var(--line); }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 300ms ease; }
.card:hover .card-media img { transform: scale(1.02); }
.card-media-empty {
  display: grid; place-items: center; background: var(--surface-2);
  color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase;
}
.card-body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.card-meta { display: flex; gap: var(--space-3); color: var(--muted); font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.04em; }
.card-title { font-size: var(--step-1); letter-spacing: -0.01em; }
.card:hover .card-title { color: var(--accent); }
.card-sub { color: var(--text-2); font-size: var(--step--1); margin-top: calc(-1 * var(--space-2)); }
.card-summary { color: var(--muted); font-size: var(--step--1); line-height: 1.55; }
.card-metrics { display: flex; gap: var(--space-5); list-style: none; padding: 0;
  border-top: var(--border) solid var(--line); padding-top: var(--space-3); }
.card-metrics li { display: grid; }
.card-cta { margin-top: auto; color: var(--accent); font-size: 0.75rem; }
.metric-value { font-size: var(--step-1); font-weight: 600; color: var(--text); line-height: 1.1; }
.metric-label { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

/* --- Filter bar --- */
.filter-bar {
  display: grid; gap: var(--space-4); margin-bottom: var(--space-6);
  padding-bottom: var(--space-5); border-bottom: var(--border) solid var(--line);
}
.filter-search { position: relative; }
.filter-search input {
  width: 100%; padding: 0.7rem 0.9rem 0.7rem 2.5rem;
  font: inherit; font-size: var(--step-0);
  background: var(--surface); color: var(--text);
  border: var(--border) solid var(--line-strong); border-radius: var(--radius);
}
.filter-search input::placeholder { color: var(--muted); }
.icon-search {
  position: absolute; left: 0.85rem; top: 50%; transform: translateY(-50%);
  color: var(--muted); pointer-events: none;
}
.filter-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.chip {
  font-family: var(--font-mono); font-size: 0.75rem;
  padding: 0.35rem 0.75rem; cursor: pointer;
  background: var(--surface); color: var(--text-2);
  border: var(--border) solid var(--line); border-radius: var(--radius);
  transition: var(--transition);
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }
:root[data-theme="dark"] .chip.is-active { color: #1a0d06; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .chip.is-active { color: #1a0d06; }
}
.filter-status { color: var(--muted); }
.empty-state { padding: var(--space-8) 0; text-align: center; color: var(--muted); }

/* --- Data tables --- */
.table-scroll { overflow-x: auto; margin-top: var(--space-5);
  border: var(--border) solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.data-table { width: 100%; border-collapse: collapse; font-size: var(--step--1); }
.data-table caption {
  text-align: left; padding: var(--space-4) var(--space-4) var(--space-2);
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--muted);
}
.data-table th, .data-table td {
  padding: 0.6rem var(--space-4); text-align: left; vertical-align: top;
  border-top: var(--border) solid var(--line);
}
.data-table thead th {
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--muted); font-weight: 500;
  background: var(--surface-2); white-space: nowrap;
}
.data-table tbody th { font-weight: 600; }
.data-table tbody tr:hover { background: var(--surface-2); }
.req-table tbody th { font-family: var(--font-mono); color: var(--accent); white-space: nowrap; }
.setup-table tbody th { width: 12rem; color: var(--muted); font-weight: 500; }
.symbol-table .math { font-size: 1.05em; }

/* --- Stat strip --- */
.stat-strip {
  display: flex; flex-wrap: wrap; gap: 0; list-style: none; padding: 0;
  margin-top: var(--space-5); border: var(--border) solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden; background: var(--surface);
}
.stat-strip li {
  flex: 1 1 8rem; padding: var(--space-4);
  border-right: var(--border) solid var(--line); display: grid; gap: 2px;
}
.stat-strip li:last-child { border-right: 0; }
.stat-label { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.stat-value { font-weight: 600; font-variant-numeric: tabular-nums; }

/* --- Callouts --- */
.callout {
  display: grid; gap: var(--space-2); margin-top: var(--space-5);
  padding: var(--space-4) var(--space-5);
  background: var(--surface-2); border-left: 3px solid var(--line-strong);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.callout-objective { background: var(--accent-soft); border-left-color: var(--accent); }
.callout-label {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted);
}
.callout-objective .callout-label { color: var(--accent); }

/* --- Lists --- */
.tick-list, .plain-list, .link-list, .issue-list, .lesson-list {
  list-style: none; padding: 0; display: grid; gap: var(--space-2); margin-top: var(--space-3);
}
.tick-list li, .issue-list li, .lesson-list li { padding-left: 1.5rem; position: relative; color: var(--text-2); }
.tick-list li::before {
  content: ""; position: absolute; left: 0.35rem; top: 0.65em;
  width: 0.4rem; height: 0.4rem; background: var(--line-strong); border-radius: 50%;
}
.constraint-list li::before { background: var(--warn); }
.scope-list li::before { background: var(--muted); }
.issue-list li::before {
  content: "!"; position: absolute; left: 0.2rem; top: 0;
  font-family: var(--font-mono); font-weight: 700; color: var(--warn); background: none;
  width: auto; height: auto; border-radius: 0;
}
.lesson-list li::before {
  content: "\2192"; position: absolute; left: 0.1rem; top: 0;
  font-family: var(--font-mono); color: var(--ok); background: none;
  width: auto; height: auto; border-radius: 0;
}
.link-list a { color: var(--accent); }

/* --- Decisions --- */
.decision-list { list-style: none; padding: 0; margin-top: var(--space-5); display: grid; gap: var(--space-5); }
.decision {
  display: grid; grid-template-columns: auto 1fr; gap: var(--space-4);
  padding: var(--space-5); background: var(--surface);
  border: var(--border) solid var(--line); border-radius: var(--radius-lg);
}
.decision-index {
  font-size: 0.75rem; font-weight: 700; color: var(--accent);
  background: var(--accent-soft); border: var(--border) solid var(--accent-line);
  border-radius: var(--radius); padding: 0.25rem 0.5rem; height: fit-content;
}
.decision-content > * + * { margin-top: var(--space-4); }
.decision-content h3 { font-size: var(--step-1); }
.decision-content h4 {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--muted); font-weight: 500; margin-bottom: var(--space-2);
}
.decision-choice, .decision-consequence { display: grid; gap: var(--space-1); }
.decision-label { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.decision-choice { border-left: 3px solid var(--accent); padding-left: var(--space-4); }
.decision-consequence { border-left: 3px solid var(--line-strong); padding-left: var(--space-4); color: var(--text-2); }
.alternative-list { list-style: none; padding: 0; display: grid; gap: var(--space-3); }
.alternative-list li {
  padding: var(--space-3) var(--space-4); background: var(--surface-2);
  border: var(--border) solid var(--line); border-radius: var(--radius);
  font-size: var(--step--1);
}
.alt-option { font-weight: 600; display: block; }
.alt-why { color: var(--muted); display: block; margin-top: var(--space-1); }
.alt-arrow { color: var(--warn); text-transform: uppercase; font-size: 0.65rem;
  letter-spacing: 0.06em; margin-right: var(--space-2); }
.decision-evidence { color: var(--muted); font-size: 0.75rem; }

/* --- Calculations --- */
.calc { margin-top: var(--space-6); padding-top: var(--space-6); border-top: var(--border) solid var(--line); }
.calc:first-of-type { border-top: 0; padding-top: 0; }
.calc h3 { font-size: var(--step-2); }
.calc h4 {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--muted); font-weight: 500; margin-top: var(--space-5);
}
.math-block {
  margin-top: var(--space-4); padding: var(--space-4) var(--space-5);
  background: var(--surface-2); border: var(--border) solid var(--line);
  border-radius: var(--radius); overflow-x: auto; text-align: center;
}
/* Before KaTeX runs, show the raw TeX in mono rather than in the body face. */
.math { font-family: var(--font-mono); font-size: 0.95em; }
.math.katex-done, .math .katex { font-family: inherit; }
.calc-steps { list-style: none; padding: 0; counter-reset: step; margin-top: var(--space-5); display: grid; gap: var(--space-5); }
.calc-steps > li { counter-increment: step; padding-left: 2.5rem; position: relative; }
.calc-steps > li::before {
  content: counter(step); position: absolute; left: 0; top: 0.1rem;
  width: 1.65rem; height: 1.65rem; display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 0.75rem; color: var(--muted);
  border: var(--border) solid var(--line); border-radius: 50%;
}
.step-desc { color: var(--text-2); }
.step-result { margin-top: var(--space-3); }
.step-arrow { color: var(--muted); margin-right: var(--space-2); }
.step-result strong { color: var(--accent); font-size: var(--step-1); }
.step-note, .calc-note { color: var(--muted); font-size: var(--step--1); margin-top: var(--space-2); }
.calc-result {
  display: grid; gap: var(--space-1); margin-top: var(--space-5);
  padding: var(--space-4) var(--space-5); background: var(--accent-soft);
  border: var(--border) solid var(--accent-line); border-radius: var(--radius);
}

/* --- Figures and gallery --- */
.figure-grid {
  display: grid; gap: var(--space-5); margin-top: var(--space-5);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
}
.figure-grid figure { margin: 0; }
.lightbox-trigger {
  display: block; width: 100%; padding: 0; cursor: zoom-in;
  background: var(--surface); border: var(--border) solid var(--line);
  border-radius: var(--radius); overflow: hidden; transition: var(--transition);
}
.lightbox-trigger:hover { border-color: var(--accent); }
.lightbox-trigger img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.figure-grid figcaption {
  margin-top: var(--space-2); font-size: var(--step--1); color: var(--muted); line-height: 1.45;
}
.fig-num { color: var(--accent); margin-right: var(--space-2); }

/* --- Lightbox --- */
.lightbox {
  border: 0; padding: 0; max-width: 100vw; max-height: 100vh; width: 100%; height: 100%;
  background: rgb(10 12 14 / 94%); color: #f2f2f2;
}
.lightbox::backdrop { background: rgb(10 12 14 / 88%); }
.lightbox figure {
  margin: 0; height: 100%; display: grid; place-content: center;
  gap: var(--space-4); padding: var(--space-8) var(--space-6);
}
.lightbox img { max-height: 78vh; max-width: min(100%, 78rem); width: auto; object-fit: contain;
  background: none; margin-inline: auto; }
.lightbox figcaption { text-align: center; font-size: var(--step--1); color: #c9cdd2; max-width: var(--measure);
  margin-inline: auto; }
.lightbox-close, .lightbox-prev, .lightbox-next {
  position: absolute; background: rgb(255 255 255 / 8%); border: var(--border) solid rgb(255 255 255 / 18%);
  color: #fff; border-radius: var(--radius); cursor: pointer; line-height: 1;
}
.lightbox-close { top: var(--space-4); right: var(--space-4); width: 2.5rem; height: 2.5rem; font-size: 1.5rem; }
.lightbox-prev, .lightbox-next { top: 50%; transform: translateY(-50%); width: 2.75rem; height: 3.5rem; font-size: 2rem; }
.lightbox-prev { left: var(--space-4); }
.lightbox-next { right: var(--space-4); }
.lightbox-close:hover, .lightbox-prev:hover, .lightbox-next:hover { background: rgb(255 255 255 / 18%); }

/* --- 3D viewer --- */
.viewer {
  position: relative; margin-top: var(--space-5); min-height: 22rem;
  display: grid; place-items: center; gap: var(--space-4);
  background: var(--surface-2); border: var(--border) solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden; padding: var(--space-5);
}
.viewer-poster { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.35; }
.viewer-load, .viewer-note { position: relative; z-index: 1; }
.viewer-note { color: var(--muted); font-size: 0.72rem; text-align: center; max-width: 30rem; }
.viewer canvas { width: 100%; height: 30rem; display: block; border-radius: var(--radius); }
.viewer.is-live { padding: 0; min-height: 30rem; }
.viewer.is-live .viewer-poster, .viewer.is-live .viewer-load { display: none; }
.viewer.is-live .viewer-note { position: absolute; bottom: var(--space-3); left: 0; right: 0; }

/* --- Downloads --- */
.download-table tbody th { max-width: 22rem; }
.download-table tbody th a { color: var(--accent); font-weight: 600; }
.file-name { display: block; color: var(--muted); font-size: 0.72rem; margin-top: 2px; }
.download-note { display: block; color: var(--muted); font-size: 0.72rem; margin-top: var(--space-1);
  font-weight: 400; }
.badge-neutral {
  display: inline-block; margin-top: var(--space-1);
  font-family: var(--font-mono); font-size: 0.62rem; text-transform: uppercase;
  letter-spacing: 0.05em; padding: 0.1rem 0.4rem; color: var(--ok);
  border: var(--border) solid currentColor; border-radius: var(--radius); font-weight: 500;
}
.checksum { color: var(--muted); cursor: help; }
.is-neutral { background: color-mix(in srgb, var(--ok) 5%, transparent); }

/* ----------------------------------------------------------------------------
   6. PAGES
   -------------------------------------------------------------------------- */

/* --- Home --- */
.hero { padding-block: var(--space-9) var(--space-8); }
.hero-inner { display: grid; gap: var(--space-8); grid-template-columns: 1fr; align-items: center; }
@media (min-width: 56rem) {
  .hero-inner { grid-template-columns: 1.4fr 1fr; }
}
.hero-eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.75rem; }
.hero-name { font-size: var(--step-5); letter-spacing: -0.035em; margin-top: var(--space-3); }
.hero-positioning {
  margin-top: var(--space-4); font-size: var(--step-2); line-height: 1.35;
  color: var(--text-2); max-width: 30ch; text-wrap: balance;
}
.hero-intro { margin-top: var(--space-5); }
.hero-location { margin-top: var(--space-6); color: var(--muted); display: flex; flex-wrap: wrap;
  align-items: center; gap: var(--space-2); }
.hero-currently { padding-left: var(--space-3); border-left: var(--border) solid var(--line); }
.hero-portrait img {
  width: 100%; border-radius: var(--radius-lg); border: var(--border) solid var(--line);
  aspect-ratio: 4 / 5; object-fit: cover;
}

.facts { padding-bottom: var(--space-8); }
.fact-grid {
  display: grid; gap: 0; list-style: none; padding: 0;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
  border: var(--border) solid var(--line); border-radius: var(--radius-lg);
  background: var(--surface); overflow: hidden;
}
.fact { padding: var(--space-5); border-right: var(--border) solid var(--line); display: grid; gap: var(--space-1); }
.fact:last-child { border-right: 0; }
.fact-value { font-size: var(--step-3); font-weight: 650; color: var(--accent); line-height: 1.05; }
.fact-label { font-weight: 550; }
.fact-note { color: var(--muted); font-size: var(--step--1); }
@media (max-width: 48rem) {
  .fact { border-right: 0; border-bottom: var(--border) solid var(--line); }
  .fact:last-child { border-bottom: 0; }
}

.capability-grid {
  display: grid; gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
}
.capability-title {
  font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--accent); font-weight: 500; padding-bottom: var(--space-3);
  border-bottom: var(--border) solid var(--line); margin-bottom: var(--space-3);
}
.capability-items { list-style: none; padding: 0; display: grid; gap: var(--space-2);
  color: var(--text-2); font-size: var(--step--1); }

.contact-strip-inner {
  display: flex; flex-wrap: wrap; gap: var(--space-5); align-items: center;
  justify-content: space-between;
  padding: var(--space-6); background: var(--surface);
  border: var(--border) solid var(--line); border-radius: var(--radius-lg);
}
.contact-strip-inner h2 { font-size: var(--step-2); }
.contact-strip .cta-row { margin-top: 0; }

/* --- Project detail --- */
.project-head { padding-block: var(--space-7) var(--space-6); }
.breadcrumb { color: var(--muted); margin-bottom: var(--space-5); display: flex; gap: var(--space-2);
  flex-wrap: wrap; font-size: 0.75rem; }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); text-decoration: underline; }
.project-head h1 { font-size: var(--step-4); letter-spacing: -0.03em; max-width: 22ch; }
.project-subtitle { margin-top: var(--space-3); font-size: var(--step-1); color: var(--accent); }
.project-summary { margin-top: var(--space-4); font-size: var(--step-1); color: var(--text-2);
  max-width: var(--measure); line-height: 1.5; }
.project-facts {
  display: flex; flex-wrap: wrap; gap: var(--space-6); margin-top: var(--space-6);
  padding-top: var(--space-5); border-top: var(--border) solid var(--line);
}
.project-facts dt { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
.project-facts dd { margin: var(--space-1) 0 0; font-weight: 550; }
.project-head .tag-list { margin-top: var(--space-5); }
.project-metrics {
  display: grid; gap: var(--space-5); list-style: none; padding: var(--space-5) 0 0;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr));
  margin-top: var(--space-5); border-top: var(--border) solid var(--line);
}
.project-metrics li { display: grid; gap: var(--space-1); }
.project-metrics .metric-value { font-size: var(--step-3); color: var(--accent); }
.metric-note { color: var(--muted); font-size: var(--step--1); }

.project-hero { margin: 0 0 var(--space-7); }
.project-hero img {
  width: 100%; max-height: 60vh; object-fit: cover;
  border-block: var(--border) solid var(--line);
}
.project-hero figcaption {
  width: min(100% - 2 * var(--space-5), var(--wrap)); margin: var(--space-3) auto 0;
  color: var(--muted); font-size: var(--step--1);
}

.project-layout { display: grid; gap: var(--space-7); align-items: start; }
@media (min-width: 62rem) {
  .project-layout { grid-template-columns: 14rem 1fr; gap: var(--space-8); }
  .project-toc { position: sticky; top: 6rem; }
}
.toc-heading {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--muted); font-weight: 500; padding-bottom: var(--space-3);
  border-bottom: var(--border) solid var(--line); margin-bottom: var(--space-3);
}
.toc-list { list-style: none; padding: 0; counter-reset: toc; display: grid; gap: var(--space-2); }
.toc-list li { counter-increment: toc; }
.toc-list a {
  display: grid; grid-template-columns: 1.5rem 1fr; gap: var(--space-1);
  text-decoration: none; font-size: var(--step--1); color: var(--muted);
  padding: var(--space-1) 0;
}
.toc-list a::before { content: counter(toc, decimal-leading-zero); font-family: var(--font-mono);
  font-size: 0.68rem; color: var(--line-strong); }
.toc-list a:hover, .toc-list a.is-current { color: var(--accent); }
.toc-list a.is-current::before { color: var(--accent); }

.project-body { min-width: 0; }
.psection { padding-block: var(--space-7); border-top: var(--border) solid var(--line); }
.psection:first-child { border-top: 0; padding-top: 0; }
.psection > h2 {
  font-size: var(--step-3); letter-spacing: -0.02em; margin-bottom: var(--space-4);
}
.psection h3 { font-size: var(--step-2); margin-top: var(--space-6); }
.psection > .prose:first-of-type { margin-top: var(--space-4); }
.project-foot {
  margin-top: var(--space-7); padding-top: var(--space-6);
  border-top: var(--border) solid var(--line); color: var(--muted);
}

/* --- About --- */
.timeline { list-style: none; padding: 0; margin-top: var(--space-5); display: grid; gap: var(--space-6); }
.timeline-item {
  display: grid; gap: var(--space-3); padding-left: var(--space-6); position: relative;
  border-left: 2px solid var(--line);
}
.timeline-item::before {
  content: ""; position: absolute; left: -0.4rem; top: 0.4rem;
  width: 0.7rem; height: 0.7rem; background: var(--accent);
  border: 2px solid var(--bg); border-radius: 50%;
}
.timeline-dates { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; }
.timeline-body h3 { font-size: var(--step-1); }
.timeline-org { color: var(--text-2); margin-top: var(--space-1); }
.timeline-grade { color: var(--accent); margin-top: var(--space-1); }
.module-heading { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--muted); font-weight: 500; margin-top: var(--space-4); }

.skill-groups { display: grid; gap: var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); margin-top: var(--space-5); }
.skill-group h3 { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--accent); font-weight: 500; padding-bottom: var(--space-2);
  border-bottom: var(--border) solid var(--line); }
.skill-list { list-style: none; padding: 0; display: grid; gap: var(--space-3); margin-top: var(--space-4); }
.skill { display: grid; grid-template-columns: 1fr auto; gap: var(--space-2) var(--space-4); align-items: baseline; }
.skill-name { font-weight: 550; }
.skill-context { grid-column: 1 / -1; color: var(--muted); font-size: var(--step--1); margin-top: -0.35rem; }
.skill-meter { display: flex; gap: 3px; }
.pip { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: var(--line); }
.pip.is-on { background: var(--accent); }

/* --- CV --- */
.cv-head { display: flex; flex-wrap: wrap; gap: var(--space-5); justify-content: space-between; align-items: end; }
.cv-name { font-size: var(--step-2); font-weight: 650; margin-top: var(--space-3); }
.cv-title { color: var(--accent); margin-top: var(--space-1); }
.cv-actions { display: grid; gap: var(--space-2); justify-items: start; }
.cv-contact { padding-block: var(--space-5); border-block: var(--border) solid var(--line); }
.cv-contact-list { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-5); list-style: none; padding: 0;
  color: var(--muted); }
.cv-contact-list a { color: var(--text-2); }
.cv-section { padding-block: var(--space-6); border-bottom: var(--border) solid var(--line); }
.cv-section > h2 { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--muted); font-weight: 500; margin-bottom: var(--space-4); }
.cv-entry + .cv-entry { margin-top: var(--space-5); }
.cv-entry-head { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: space-between;
  align-items: baseline; }
.cv-entry-head h3 { font-size: var(--step-1); }
.cv-dates { color: var(--muted); white-space: nowrap; }
.cv-org { color: var(--text-2); margin-top: var(--space-1); }
.cv-modules { margin-top: var(--space-3); font-size: var(--step--1); color: var(--muted); }
.cv-label { display: block; font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.07em; }
.cv-entry ul, .cv-project-points { padding-left: 1.2rem; margin-top: var(--space-3); color: var(--text-2);
  font-size: var(--step--1); display: grid; gap: var(--space-2); }
.cv-projects { list-style: none; padding: 0; display: grid; gap: var(--space-5); }
.cv-project-head { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: space-between;
  align-items: baseline; }
.cv-project-head h3 { font-size: var(--step-1); }
.cv-project-head a { text-decoration: none; }
.cv-project-head a:hover { color: var(--accent); text-decoration: underline; }
.cv-project-dates { color: var(--muted); }
.cv-project-role { color: var(--accent); margin-top: var(--space-1); }
.cv-project > p { margin-top: var(--space-2); color: var(--text-2); }
.cv-project-points strong { color: var(--accent); }
.cv-skills { display: grid; gap: var(--space-3); }
.cv-skills > div { display: grid; grid-template-columns: 1fr; gap: var(--space-1); }
@media (min-width: 40rem) {
  .cv-skills > div { grid-template-columns: 12rem 1fr; gap: var(--space-4); }
}
.cv-skills dt { color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; }
.cv-skills dd { margin: 0; color: var(--text-2); }

/* --- Contact --- */
.contact-list { list-style: none; padding: 0; display: grid; gap: 0; margin-top: var(--space-5);
  border: var(--border) solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.contact-item { display: grid; grid-template-columns: 1fr; gap: var(--space-1);
  padding: var(--space-4) var(--space-5); border-top: var(--border) solid var(--line); }
.contact-item:first-child { border-top: 0; }
@media (min-width: 34rem) {
  .contact-item { grid-template-columns: 7rem 1fr; gap: var(--space-4); align-items: baseline; }
}
.contact-label { color: var(--muted); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.07em; }
.contact-value a { color: var(--accent); }

.contact-form { display: grid; gap: var(--space-4); margin-top: var(--space-5); max-width: 34rem; }
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--step--1); font-weight: 550; }
.field .optional { color: var(--muted); font-weight: 400; }
.field input, .field textarea {
  font: inherit; padding: 0.6rem 0.8rem; background: var(--surface); color: var(--text);
  border: var(--border) solid var(--line-strong); border-radius: var(--radius); width: 100%;
}
.honeypot { position: absolute; left: -9999px; }
.form-note { color: var(--muted); font-size: var(--step--1); }

/* --- 404 --- */
.error-head { text-align: center; padding-block: var(--space-9) var(--space-7); }
.error-code { font-size: var(--step-5); color: var(--accent-line); font-weight: 700; line-height: 1; }
.error-head .cta-row { justify-content: center; }
.error-head .page-lede { margin-inline: auto; }

/* ----------------------------------------------------------------------------
   7. STATES
   -------------------------------------------------------------------------- */
:where(a, button, input, textarea, select, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover, .btn:hover { transform: none; }
  .card:hover .card-media img { transform: none; }
}

@media (forced-colors: active) {
  .card, .btn, .data-table, .chip { border: 1px solid CanvasText; }
  .pip.is-on { background: Highlight; }
}

/* --- Print: makes Ctrl+P on /cv/ produce something you could actually send. --- */
@media print {
  :root { --bg: #fff; --surface: #fff; --surface-2: #fff; --text: #000; --text-2: #222;
          --muted: #555; --line: #ccc; --accent: #000; }
  body { font-size: 10.5pt; line-height: 1.4; }
  .site-header, .site-footer, .no-print, .skip-link, .theme-toggle, .cta-row,
  .project-toc, .lightbox, .viewer, .filter-bar { display: none !important; }
  .wrap, .wrap.narrow { width: 100%; }
  a { text-decoration: none; color: #000; }
  .prose a::after, .cv-contact-list a::after { content: " (" attr(href) ")"; font-size: 8pt; color: #555; }
  .cv-section, .psection { break-inside: avoid; padding-block: 8pt; }
  .cv-entry, .decision, .calc, .card { break-inside: avoid; }
  h1, h2, h3 { break-after: avoid; }
  .data-table { font-size: 9pt; }
  .table-scroll { overflow: visible; border: 1px solid #ccc; }
}