:root {
  --color-background: #f7f6f5;
  --color-surface: #fff;
  --color-text-primary: #000;
  --color-text-ink: #191919;
  --color-text-secondary: #1919198f;
  --color-text-muted: rgba(25, 25, 25, 0.4);
  --color-border: #0000000f;
  --color-accent: #2200ff;
  --color-button: #191919;

  --font-heading: "Geist", system-ui, sans-serif;
  --font-body: "Newsreader", Georgia, serif;
  --font-mono: "Geist Mono", ui-monospace, Menlo, monospace;

  --container-padding: 20px;
  --spacing-section: 88px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
@media (min-width: 768px) {
  :root { --container-padding: 64px; --spacing-section: 180px; }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p { margin: 0; }
::selection { background: var(--color-accent); color: #fff; }

.container { max-width: 1440px; margin: 0 auto; padding: 0 var(--container-padding); }

/* ---------- 15-column content grid with hairline guides ---------- */
.content-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); position: relative; }
@media (min-width: 768px) { .content-grid { grid-template-columns: repeat(15, minmax(0, 1fr)); } }

.guides { position: absolute; inset: 0; pointer-events: none; z-index: -1; }
.guide { position: relative; height: 100%; }
.guide.c1 { grid-column: 1; } .guide.c4 { grid-column: 4; } .guide.c12 { grid-column: 12; }
.guide.end { grid-column: 6; }
.guide.end::before { left: 100%; }
@media (min-width: 768px) { .guide.end { grid-column: 15; } }
.guides::after {
  content: ""; position: absolute; inset: auto -5px 0 0; height: 400px;
  background: linear-gradient(rgba(247, 246, 245, 0), var(--color-background));
}
.guide::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 1px;
  transform: translateX(-50%); background: var(--color-border);
}
.guide.fade::before { bottom: auto; height: 200px; background: linear-gradient(var(--color-border), transparent); }
.guide.md { display: none; }
@media (min-width: 768px) { .guide.md { display: block; } }

/* ---------- Mobile top bar ---------- */
.topbar { position: fixed; inset: 0 0 auto; z-index: 60; background: var(--color-background); }
.topbar .container { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; padding-bottom: 24px; }
.topbar button { font: 400 15px/1.3 var(--font-heading); background: none; border: 0; padding: 0; cursor: pointer; color: inherit; }
@media (min-width: 768px) { .topbar { display: none; } }

.mobile-nav { margin: 0; padding: 0; border: 0; inset: 0; width: 100%; height: 100%; background: var(--color-background); color: inherit; }
.mobile-nav:popover-open { display: flex; flex-direction: column; }
.mobile-nav ul { list-style: none; margin: 0; padding: 0; }
.mobile-nav li a {
  display: flex; padding: 12px 0; border-bottom: 1px solid var(--color-border);
  font: 400 24px/1.2 var(--font-heading); letter-spacing: -0.02em;
}
.mobile-nav a[aria-current] { color: var(--color-accent); }

/* ---------- Logo ---------- */
.logo { display: inline-flex; align-items: center; gap: 8px; font: 500 15px/1 var(--font-heading); letter-spacing: -0.01em; }
.logo-mark { width: 20px; height: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
.logo-mark span { background: currentColor; }
.logo-mark span:nth-child(2) { background: var(--color-accent); }

/* ---------- Sticky sidebar ---------- */
.sidebar {
  display: none;
  grid-column: 1 / span 3;
  position: sticky; top: calc(var(--spacing-section) - 40px); align-self: start;
  margin-left: -18px; padding-bottom: 320px; transform: translateY(-64px);
  flex-direction: column; gap: 16px; z-index: 40; user-select: none;
}
@media (min-width: 768px) { .sidebar { display: flex; } }
.sidebar .logo { margin-left: 18px; margin-bottom: 4px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.sidebar li { display: flex; align-items: center; gap: 10px; padding: 1px 0; }
.sidebar li .tick { width: 8px; height: 12px; flex-shrink: 0; display: flex; justify-content: center; opacity: 0; }
.sidebar li .tick::before { content: ""; width: 2px; height: 12px; background: var(--color-accent); }
.sidebar li.active .tick { opacity: 1; }
.sidebar a { font: 400 15px/1.3 var(--font-heading); transition: color 0.15s; }
.sidebar a:hover, .sidebar li.active a { color: var(--color-accent); }

/* ---------- Page sections ---------- */
main > .container { padding-top: 96px; }
@media (min-width: 768px) { main > .container { padding-top: var(--spacing-section); } }

.page {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr));
  row-gap: 20px; padding-bottom: 80px;
}
@media (min-width: 768px) { .page { grid-column: 4 / -1; row-gap: 106px; } }

.label {
  display: none; grid-column: 1;
  font: 400 10px/1.5 var(--font-body); color: var(--color-text-secondary); user-select: none;
}
@media (min-width: 768px) { .label { display: block; } }

.h1 {
  grid-column: 1 / -1; margin: 0;
  font: 400 24px/1.2 var(--font-heading); letter-spacing: -0.02em;
}
@media (min-width: 768px) { .h1 { grid-column: 2 / span 3; font-size: 36px; line-height: 1.1; padding-right: 16px; } }

.prose { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 1.5em; text-wrap: pretty; }
@media (min-width: 768px) { .prose { grid-column: 6 / span 7; } }
.prose em { font-style: italic; }
.prose a { border-bottom: 1px solid currentColor; }
.prose a:hover { color: var(--color-accent); }

/* ---------- Project grid (the hover effect) ---------- */
.projects {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr));
  row-gap: 40px; margin-top: 40px;
}
@media (min-width: 768px) {
  .projects { grid-column: 2 / span 11; grid-template-columns: repeat(11, minmax(0, 1fr)); row-gap: 53px; margin-top: 0; }
}

.project {
  position: relative; margin: 0;
  grid-column: var(--m-col, 1) / span 9;
  display: flex; flex-direction: column; gap: 6px; align-self: start;
  transition: opacity 0.3s;
}
.project > a.cover-link { position: absolute; inset: 0; z-index: 1; }
.project .img { position: relative; overflow: hidden; background: #e9e7e3; transition: filter 0.3s; }
.project img { width: 100%; height: auto; aspect-ratio: 803 / 1002; object-fit: cover; transition: filter 0.3s, transform 0.8s var(--ease); }
.project .status {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  font: 400 11px/1 var(--font-mono); letter-spacing: 0.02em; text-transform: uppercase;
  color: #fff; background: rgba(0, 0, 0, 0.35); backdrop-filter: blur(8px);
  padding: 6px 8px;
}
.project .status.light { color: var(--color-text-ink); background: rgba(255, 255, 255, 0.6); }

.project figcaption { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; transition: filter 0.3s; }
.project .meta { display: flex; flex-direction: column; }
.project .name {
  display: grid; overflow: hidden; color: var(--color-text-ink);
  font: 400 15px/1.5 var(--font-body);
}
.project .name > span { grid-area: 1 / 1; transition: transform 0.3s ease-out; }
.project .name .reveal { display: none; white-space: nowrap; transform: translateY(100%); color: var(--color-accent); }
.project .kind { font: 400 15px/1.3 var(--font-heading); color: var(--color-text-muted); }
.project .num { font: 400 15px/1.5 var(--font-body); color: var(--color-text-muted); font-variant-numeric: tabular-nums; }

.pitch {
  display: none; z-index: 10; align-self: start; pointer-events: none;
  opacity: 0; transition: opacity 0.3s; text-wrap: pretty; margin: 0;
}
.pitch .q { display: flex; flex-direction: column; gap: 1.2em; margin-top: -4px; font: 300 20px/1.2 var(--font-body); letter-spacing: -0.01em; }
.pitch p { position: relative; }
.pitch p:first-child::before { content: "\201C"; position: absolute; right: 100%; }
.pitch cite { display: block; margin-top: 1.4em; font: 400 11px/1.4 var(--font-mono); font-style: normal; text-transform: uppercase; letter-spacing: 0.02em; color: var(--color-text-secondary); }

@media (min-width: 768px) {
  .project { grid-column: var(--col) / span var(--span); grid-row: var(--row); }
  .pitch { display: block; grid-column: var(--col) / span var(--span); grid-row: var(--row); }

  .project .name .reveal { display: block; }
  .project:hover .name .main, .project:focus-within .name .main { transform: translateY(-100%); }
  .project:hover .name .reveal, .project:focus-within .name .reveal { transform: translateY(0); }
  .project:hover img { transform: scale(1.02); }

  /* Hovering one project fades + blurs every other one */
  .projects:has(> .project:hover) > .project:not(:hover) { opacity: 0.12; }
  .projects:has(> .project:hover) > .project:not(:hover) .img { filter: blur(12px); }
  .projects:has(> .project:hover) > .project:not(:hover) figcaption { filter: blur(4px); }
  .project:hover + .pitch { opacity: 1; }
}
@media (min-width: 768px) and (max-width: 1200px) {
  .project .name, .project .kind, .project .num { font-size: 13px; }
}

/* ---------- Approach list ---------- */
.steps { grid-column: 1 / -1; list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--color-border); }
@media (min-width: 768px) { .steps { grid-column: 2 / span 11; } }
.steps li {
  display: grid; grid-template-columns: 48px 1fr; gap: 8px 16px;
  padding: 20px 0; border-bottom: 1px solid var(--color-border);
}
@media (min-width: 768px) { .steps li { grid-template-columns: repeat(11, minmax(0, 1fr)); gap: 0; } }
.steps .n { font: 400 15px/1.5 var(--font-body); color: var(--color-text-muted); font-variant-numeric: tabular-nums; }
.steps h3 { margin: 0; font: 400 20px/1.2 var(--font-heading); letter-spacing: -0.015em; }
.steps p { grid-column: 2; color: var(--color-text-secondary); }
@media (min-width: 768px) {
  .steps .n { grid-column: 1; }
  .steps h3 { grid-column: 2 / span 3; }
  .steps p { grid-column: 5 / span 6; }
}

/* ---------- Contact / footer ---------- */
.cta { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
@media (min-width: 768px) { .cta { grid-column: 6 / span 7; } }
.btn {
  display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 16px;
  font: 400 15px/1 var(--font-heading); background: var(--color-button); color: #fff;
  transition: background 0.2s;
}
.btn:hover { background: var(--color-accent); }
.btn.ghost { background: transparent; color: var(--color-text-ink); box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12); }
.btn.ghost:hover { color: var(--color-accent); box-shadow: inset 0 0 0 1px var(--color-accent); }

.contact-form { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 20px; }
@media (min-width: 768px) { .contact-form { grid-column: 6 / span 7; margin-top: -50px; } }
.contact-form .cta { grid-column: auto; }
.topics { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; border: 0; }
.topics legend { width: 100%; margin-bottom: 10px; padding: 0; font: 400 14px/1.3 var(--font-heading); color: var(--color-text-ink); }
.topics input { position: absolute; opacity: 0; pointer-events: none; }
.topics span {
  display: inline-flex; align-items: center; height: 34px; padding: 0 14px; cursor: pointer;
  font: 400 14px/1 var(--font-heading); color: var(--color-text-ink);
  background: var(--color-surface); box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.16); transition: color 0.2s, box-shadow 0.2s, background 0.2s;
}
.topics span:hover { color: var(--color-accent); box-shadow: inset 0 0 0 1px var(--color-accent); }
.topics input:checked + span { background: var(--color-button); color: #fff; box-shadow: none; }
.topics input:focus-visible + span { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.field-row { display: grid; gap: 20px; }
@media (min-width: 768px) { .field-row { grid-template-columns: 1fr 1fr; } }
.field { display: flex; flex-direction: column; gap: 8px; }
.field > span { font: 400 14px/1.3 var(--font-heading); color: var(--color-text-ink); }
.field input, .field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid rgba(0, 0, 0, 0.16); border-radius: 0;
  background: var(--color-surface); color: var(--color-text-ink); font: 400 17px/1.4 var(--font-body); resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field input:hover, .field textarea:hover { border-color: rgba(0, 0, 0, 0.32); }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(34, 0, 255, 0.12); }
.field textarea::placeholder { color: var(--color-text-muted); }
.field.invalid input, .field.invalid textarea { border-color: #d4351c; }
.contact-form .btn { border: 0; cursor: pointer; }
.form-note { font: 400 13px/1.3 var(--font-heading); color: var(--color-text-secondary); }
.form-note a { border-bottom: 1px solid currentColor; }
.form-note a:hover { color: var(--color-accent); }
.form-status { margin: 0; font: 400 14px/1.4 var(--font-heading); color: var(--color-text-secondary); }
.form-status:empty { display: none; }

footer { border-top: 1px solid var(--color-border); }
footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; padding-top: 24px; padding-bottom: 32px; font: 400 13px/1.3 var(--font-heading); color: var(--color-text-muted); }
footer .mono { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.02em; }

/* Mobile: hide reveal text, show plain stacking */
@media (max-width: 767px) {
  .project:nth-of-type(odd) { --m-col: 1; }
  .project:nth-of-type(even) { --m-col: 4; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}

.prose .tagline { font-family: var(--font-heading); font-weight: 500; letter-spacing: -0.01em; }

/* ---------- Project detail page ---------- */
.detail {
  grid-column: 1 / -1;
  display: flex; flex-direction: column;
  padding-bottom: 96px; text-wrap: pretty;
}
@media (min-width: 768px) { .detail { grid-column: 5 / span 9; } }

.d-row, .d-header, .d-facts { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); }
@media (min-width: 768px) { .d-row, .d-header, .d-facts { grid-template-columns: repeat(9, minmax(0, 1fr)); } }

.d-back {
  align-self: flex-start; margin-bottom: 40px;
  font: 400 12px/1.3 var(--font-mono); color: var(--color-text-secondary);
  transition: color 0.15s, background 0.15s;
}
.d-back:hover { background: var(--color-accent); color: #fff; }

.d-header { row-gap: 24px; }
.d-title {
  grid-column: 1 / -1; display: flex; flex-direction: column; justify-content: space-between; gap: 24px;
  font: 400 24px/0.9 var(--font-heading); letter-spacing: -0.02em;
}
.d-title-top { display: flex; flex-direction: column; gap: 12px; }
.d-title h1 { margin: 0; font: inherit; }
.d-title .d-kind { font-family: var(--font-body); color: var(--color-text-secondary); }
.d-num { color: var(--color-text-secondary); }
.d-cover { order: -1; grid-column: 1 / span 4; width: 100%; height: auto; }
@media (min-width: 768px) {
  .d-title { grid-column: 1 / span 4; grid-row: 1; }
  .d-cover { order: 0; grid-column: 5 / span 3; grid-row: 1; }
}

.d-rule { grid-column: 1 / -1; width: 100%; margin: 32px 0; border: 0; border-top: 1px solid var(--color-border); }
@media (min-width: 768px) { .d-rule { grid-column: 1 / span 7; } }

.d-facts { margin: 0 0 40px; row-gap: 16px; }
.d-facts > div { grid-column: span 3; display: flex; flex-direction: column; gap: 2px; }
@media (min-width: 768px) { .d-facts > div { grid-column: span 2; } .d-facts > div:nth-child(3) { grid-column: span 3; } }
.d-facts dd { white-space: nowrap; }
.d-facts dt { font: 400 10px/1.5 var(--font-body); color: var(--color-text-secondary); opacity: 0.7; }
.d-facts dd { margin: 0; font: 400 15px/1.3 var(--font-heading); }

.d-body { display: flex; flex-direction: column; gap: 40px; }
.d-text { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 1.5em; }
@media (min-width: 768px) { .d-text { grid-column: 1 / span 7; } }

.d-label { font: 400 10px/1.5 var(--font-body); color: var(--color-text-secondary); opacity: 0.6; user-select: none; }
.d-quote { row-gap: 8px; }
.d-quote .d-label { grid-column: 1 / -1; }
.d-quote blockquote { grid-column: 1 / -1; margin: 0; }
.d-quote blockquote p { font: 300 20px/1.3 var(--font-body); letter-spacing: -0.01em; text-wrap: balance; }
@media (min-width: 768px) {
  .d-quote { padding: 10px 0; }
  .d-quote .d-label { grid-column: 1; margin-top: 2px; }
  .d-quote blockquote { grid-column: 2 / span 7; }
  .d-quote blockquote p { font-size: 24px; }
}

.d-figure { margin: 0; row-gap: 8px; }
.d-figure img { grid-column: 1 / -1; width: 100%; height: auto; }
.d-figure figcaption { grid-column: 1 / -1; font: 400 10px/1.5 var(--font-body); color: var(--color-text-secondary); opacity: 0.7; }
@media (min-width: 768px) {
  .d-figure img, .d-figure figcaption { grid-row: 1; }
  .d-figure.right img { grid-column: 1 / span 7; }
  .d-figure.right figcaption { grid-column: 8 / span 2; padding-left: 16px; }
  .d-figure.left img { grid-column: 2 / span 7; }
  .d-figure.left figcaption { grid-column: 1; padding-right: 8px; }
}

.d-highlight {
  text-decoration: underline; text-decoration-color: #525252; text-underline-offset: 4px; text-decoration-thickness: 1px;
  background-image: repeating-linear-gradient(-60deg, rgba(0, 0, 0, 0.08) 0, rgba(0, 0, 0, 0.08) 1px, transparent 1px, transparent 2px);
}
.d-link { color: var(--color-accent); text-decoration: underline dotted; text-underline-offset: 2px; }
.d-link:hover { background: var(--color-accent); color: var(--color-background); }

.d-next { display: flex; flex-direction: column; gap: 4px; align-self: flex-start; }
.d-next-name { font: 400 24px/1.1 var(--font-heading); letter-spacing: -0.02em; transition: color 0.15s; }
@media (min-width: 768px) { .d-next-name { font-size: 36px; } }
.d-next .d-kind { font: 400 15px/1.3 var(--font-heading); color: var(--color-text-muted); }
.d-next:hover .d-next-name { color: var(--color-accent); }