/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* First focusable element in <body>; clipped like .sr-only until focused,
   then pinned to the top of the viewport so keyboard users can jump past
   the header straight to <main id="main">. */
.skip-link {
  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:focus-visible {
  position: fixed;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 100;
  width: auto;
  height: auto;
  padding: var(--space-3) var(--space-6);
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 4px;
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* External-link glyph appended to every target="_blank" anchor */
.icon-external {
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  margin-left: 0.3em;
  vertical-align: -0.05em;
  flex: none;
}

/* Design tokens (palette, type, spacing, shape) now live in the shared
   shuffle-works-tokens.css so every product in the family draws from one
   source. index.html links it before this file; the sync script injects it
   into downstream pages. This file only consumes the tokens below. */

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.55;
}

h1, h2, h3 {
  font-stretch: var(--font-stretch-heading);
}

.container {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-stretch: var(--font-stretch-heading);
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.org-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.org-link:hover { color: var(--color-text); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-button);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.theme-toggle .icon { width: 1.1rem; height: 1.1rem; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4rem, 8vw, 7rem) clamp(3.5rem, 7vw, 6rem);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding-block: var(--space-8);
}

.hero-kicker {
  width: max-content;
  max-width: 100%;
  margin-inline: auto;
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2rem, 1.2rem + 3.6vw, 3.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  text-wrap: balance;
}

.tagline {
  margin-top: var(--space-4);
  max-width: 48rem;
  margin-inline: auto;
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--color-text-muted);
  text-wrap: pretty;
}

.evidence-list {
  display: grid;
  grid-template-columns: minmax(0, max-content);
  justify-content: center;
  justify-items: center;
  gap: var(--space-2);
  max-width: 46rem;
  margin: var(--space-6) auto 0;
}

.evidence-list li {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tag);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-align: center;
  text-transform: uppercase;
  background: var(--color-bg-elevated);
}

@media (min-width: 42rem) {
  .evidence-list {
    grid-template-columns: repeat(2, max-content);
  }

  .evidence-list li:nth-child(3) {
    grid-column: 1 / -1;
    justify-self: center;
  }
}

.org-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: var(--space-8);
  min-height: 2.75rem; /* 44px touch target; Trace's 32px control is for pointer UIs */
  padding: 0 1.25rem;
  border-radius: var(--radius-button);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background-color 0.15s ease;
}

.org-cta:hover {
  background: color-mix(in srgb, var(--color-accent) 12%, var(--color-accent-soft));
  color: var(--color-accent-hover);
}

.org-cta:active {
  transform: translateY(1px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.hero-actions .org-cta {
  margin-top: 0;
}

/* Proof */
.proof {
  padding-block: clamp(3rem, 5vw, 4.25rem);
  background: var(--color-bg-elevated);
  border-block: 1px solid var(--color-border);
}

.proof-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
}

.proof-heading h2 {
  font-size: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.proof-heading p {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  max-width: 34rem;
  text-wrap: pretty;
}

.proof-list {
  display: grid;
  gap: 1px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-panel);
  overflow: hidden;
  background: var(--color-border);
}

.proof-list li {
  display: grid;
  grid-template-columns: minmax(8rem, 0.42fr) minmax(0, 1fr);
  gap: var(--space-4);
  padding: clamp(1rem, 2vw, 1.35rem) var(--space-6);
  background: var(--color-bg);
}

.proof-list strong {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
}

.proof-list span {
  color: var(--color-text-muted);
  text-wrap: pretty;
}

/* Footer: hub-only variant of the shared shuffle-footer (see
   shuffle-works-footer.css); it only adds the space above the footer. */
.shuffle-footer--hub {
  margin-top: var(--space-16);
}

/* Projects grid */
.projects {
  padding-block: clamp(3rem, 5vw, 4.5rem);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-8);
  text-align: center;
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-card-featured {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .projects-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: stretch;
  }
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-panel);
  transition: border-color 0.15s ease;
}

.project-card:hover {
  border-color: var(--color-accent);
}

@media (min-width: 960px) {
  .project-card-featured {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
    grid-template-rows: auto auto auto;
    column-gap: var(--space-8);
    row-gap: var(--space-4);
    padding: var(--space-8);
  }

  .project-card-supporting {
    grid-column: span 1;
  }
}

.project-card-featured {
  border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-border));
}

.project-name {
  font-size: 1.15rem;
  font-weight: 600;
}

.project-card-featured .project-name {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
}

.project-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.project-card-featured .project-desc,
.project-card-featured .project-use-group {
  max-width: 58ch;
}

.project-use-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex-grow: 1;
}

.project-use {
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.45;
  text-wrap: pretty;
}

.project-use span {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-right: 0.25rem;
}

/* Compact facts that extend the "Use when" sentence: plain text, no boxed
   treatment, so they read as part of the use-case group rather than a
   separate chip language. */
.use-facts {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.use-facts div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4em;
}

@media (min-width: 960px) {
  .project-card-featured .project-name,
  .project-card-featured .project-desc,
  .project-card-featured .project-use-group {
    grid-column: 1;
  }

  .project-card-featured .project-meta {
    grid-column: 2;
    grid-row: 1 / -1;
    align-self: end;
  }

  .project-card-supporting .project-desc {
    min-height: calc(1.45em * 3);
  }

  .project-card-supporting .project-use {
    min-height: calc(1.45em * 4);
  }
}

.use-facts dt {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  flex: none;
}

.use-facts dt::after {
  content: ':';
}

.use-facts dd {
  color: var(--color-text-muted);
  font-size: 0.86rem;
  line-height: 1.4;
}

/* Tags + links share one "metadata" group: tight internal gap, one
   generous gap separating it from the use-case group above. */
.project-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 1.25rem;
  padding: 0 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-tag);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  row-gap: var(--space-2);
  column-gap: var(--space-4);
  font-size: 0.9rem;
}

.project-links a {
  color: var(--color-accent);
  white-space: nowrap;
}

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

/* Scroll reveal */
html:where(.js:not(.no-js)) .project-card[data-reveal] {
  opacity: 0;
  transform: translateY(0.75rem);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.project-card[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Respect reduced-motion: disable non-essential animation entirely */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .project-card,
  html:where(.js:not(.no-js)) .project-card[data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 760px) {
  .container {
    padding-inline: var(--space-4);
  }

  .header-actions {
    gap: var(--space-2);
  }

  .proof-inner,
  .proof-list li {
    grid-template-columns: 1fr;
  }

  .proof-list li {
    gap: var(--space-3);
  }
}