/*
  OpenSecret — design system
  ---------------------------------------------------------------
  One stylesheet, on purpose. The brief asks for a small design
  system rather than a large token library, so everything lives
  here: custom properties, a hairline "drafting sheet" grid of
  panels, and one signature detail (corner tick marks, borrowed
  from print crop-marks and technical drawing registration marks —
  the literal meeting point of "design" and "technology").

  No web fonts are loaded. Display type uses the platform's serif,
  UI type uses the platform's system sans. This is a deliberate
  performance + identity decision, not an oversight — see README.
*/

:root {
  /* Color — kept to a small, named set */
  --paper: #f1efe8;       /* canvas */
  --paper-deep: #e6e1d2;  /* secondary panel tone */
  --fog: #dbe0e1;         /* cool neutral panel tone */
  --ink: #15161b;         /* primary text / dark panels */
  --ink-70: rgba(21, 22, 27, 0.72);
  --ink-45: rgba(21, 22, 27, 0.45);
  --on-ink: #f4f3ee;      /* text on dark panels */
  --on-ink-70: rgba(244, 243, 238, 0.72);
  --signal: #232f8f;      /* the one accent — used sparingly */
  --on-signal: #f4f3ee;
  --line: rgba(21, 22, 27, 0.16);
  --line-on-ink: rgba(244, 243, 238, 0.22);

  /* Type */
  --font-display: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;

  --text-h1: clamp(2.75rem, 5vw + 1rem, 5.25rem);
  --text-h2: clamp(2rem, 3vw + 1rem, 3.25rem);
  --text-h3: clamp(1.375rem, 1.5vw + 1rem, 1.875rem);
  --text-lead: clamp(1.0625rem, 0.5vw + 1rem, 1.25rem);
  --text-body: 1rem;
  --text-eyebrow: 0.75rem;

  /* Spacing scale */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;
  --sp-9: 6rem;

  --sidebar-w: 17rem;
  --radius: 0px; /* boxy, on purpose — see signature corner-tick detail */
}

/* ---------------------------------------------------------------
   Reset
--------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; color: inherit; background: none; border: 0; }

/* ---------------------------------------------------------------
   Accessibility primitives
--------------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: -3rem;
  background: var(--ink);
  color: var(--on-ink);
  padding: var(--sp-3) var(--sp-5);
  font-family: var(--font-sans);
  font-weight: 600;
  z-index: 100;
  transition: top 0.15s ease;
}
.skip-link:focus {
  top: var(--sp-4);
}

:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 2px;
}
.panel--ink :focus-visible,
.btn--signal:focus-visible {
  outline-color: var(--on-ink);
}

.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;
}

/* ---------------------------------------------------------------
   Shell: sidebar + main
--------------------------------------------------------------- */
.shell {
  display: flex;
  min-height: 100vh;
  border-bottom: 1px solid var(--line);
}

.sidebar {
  flex: 0 0 var(--sidebar-w);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--sp-6) var(--sp-5);
  border-right: 1px solid var(--line);
  position: sticky;
  top: 0;
  height: 100vh;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.01em;
}
.wordmark__mark {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--signal);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-70);
  margin: var(--sp-6) 0 var(--sp-4);
}
.panel--ink .eyebrow,
.panel--signal .eyebrow { color: var(--on-ink-70); }

.primary-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.primary-nav a:not(.btn) {
  display: block;
  padding: var(--sp-2) 0;
  font-family: var(--font-display);
  font-size: 1.375rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.primary-nav a:not(.btn):hover { color: var(--signal); }
.primary-nav a[aria-current="page"] {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.sidebar__cta { margin-top: var(--sp-6); width: 100%; justify-content: center; }

.sidebar__foot {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-45);
  line-height: 1.7;
}
.sidebar__foot a { text-decoration: underline; text-underline-offset: 2px; }

.nav-toggle { display: none; }

/* ---------------------------------------------------------------
   Main / page grid
--------------------------------------------------------------- */
.main {
  flex: 1;
  min-width: 0;
}

.page-header {
  padding: var(--sp-7) var(--sp-6) var(--sp-5);
  border-bottom: 1px solid var(--line);
}
.page-header .eyebrow { margin-top: 0; }
.page-header h1 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  letter-spacing: -0.01em;
  max-width: 32ch;
}
.page-header p {
  margin-top: var(--sp-4);
  max-width: 46ch;
  font-size: var(--text-lead);
  color: var(--ink-70);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-5) var(--sp-6) 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-decoration: none;
  color: var(--ink-70);
}
.back-link:hover { color: var(--signal); }

/* The bento grid: panels tile edge-to-edge, separated by a single
   hairline — a "drafting sheet" rather than gapped cards. */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.panel {
  position: relative;
  padding: var(--sp-6);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
}
.grid > .panel:nth-child(3n) { border-right: 0; }

.panel--paper { background: var(--paper); }
.panel--paper-deep { background: var(--paper-deep); }
.panel--fog { background: var(--fog); }
.panel--ink { background: var(--ink); color: var(--on-ink); border-color: var(--line-on-ink); }
.panel--signal { background: var(--signal); color: var(--on-signal); border-color: var(--line-on-ink); }
.panel--ink .panel__lede, .panel--signal .panel__lede { color: var(--on-ink-70); }

/* Signature detail: registration ticks at a panel's active corner.
   Pure CSS, no images — two 1px segments per corner. */
.panel--marked::before,
.panel--marked::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
}
.panel--marked::before {
  top: var(--sp-4);
  left: var(--sp-4);
  border-top: 1px solid currentColor;
  border-left: 1px solid currentColor;
  opacity: 0.5;
}
.panel--marked::after {
  bottom: var(--sp-4);
  right: var(--sp-4);
  border-bottom: 1px solid currentColor;
  border-right: 1px solid currentColor;
  opacity: 0.5;
}

.panel--span2 { grid-column: span 2; }
.panel--span3 { grid-column: span 3; }
.panel--row2 { grid-row: span 2; }

.panel__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.7;
}
.panel h2, .panel h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}
.panel--feature h2 {
  font-size: var(--text-h1);
  margin-top: var(--sp-5);
  line-height: 1.02;
}
.panel h3 { font-size: var(--text-h3); margin-top: var(--sp-4); }
.panel__lede {
  margin-top: var(--sp-4);
  color: var(--ink-70);
  max-width: 40ch;
}
.panel__spacer { flex: 1; }
.panel__foot { margin-top: var(--sp-6); }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}
.tags li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: var(--sp-1) var(--sp-2);
  border: 1px solid var(--line);
}
.panel--ink .tags li { border-color: var(--line-on-ink); }

/* ---------------------------------------------------------------
   Buttons & links
--------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-5);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border: 1px solid currentColor;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.btn--signal {
  background: var(--signal);
  color: var(--on-signal);
  border-color: var(--signal);
}
.btn--signal:hover { background: #1b2570; border-color: #1b2570; }
.btn--outline { background: transparent; }
.btn--outline:hover { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.panel--ink .btn--outline { border-color: var(--on-ink); }
.panel--ink .btn--outline:hover { background: var(--on-ink); color: var(--ink); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-sans);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}
.link-arrow:hover { color: var(--signal); }

.cta-row { display: flex; flex-wrap: wrap; gap: var(--sp-4); margin-top: var(--sp-6); }

/* ---------------------------------------------------------------
   Client strip
--------------------------------------------------------------- */
.clients {
  padding: var(--sp-8) var(--sp-6);
  border-bottom: 1px solid var(--line);
}
.clients p.lead-line {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  max-width: 36ch;
}
.client-list {
  margin-top: var(--sp-7);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-7) var(--sp-8);
}
.client-list li {
  font-family: var(--font-display);
  font-size: 1.375rem;
  color: var(--ink-70);
}

/* ---------------------------------------------------------------
   Case study prev/next + footer CTA
--------------------------------------------------------------- */
.case-nav {
  display: flex;
  border-top: 1px solid var(--line);
}
.case-nav a {
  flex: 1;
  padding: var(--sp-6);
  text-decoration: none;
}
.case-nav a:first-child { border-right: 1px solid var(--line); }
.case-nav .eyebrow { margin: 0 0 var(--sp-2); }
.case-nav__title { font-family: var(--font-display); font-size: var(--text-h3); }
.case-nav a:hover .case-nav__title { color: var(--signal); }
.case-nav a.case-nav--next { text-align: right; }

.talk-cta {
  padding: var(--sp-8) var(--sp-6);
  background: var(--ink);
  color: var(--on-ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  flex-wrap: wrap;
}
.talk-cta h2 { font-family: var(--font-display); font-size: var(--text-h2); }

/* ---------------------------------------------------------------
   Footer
--------------------------------------------------------------- */
.site-footer {
  padding: var(--sp-6);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--sp-3);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ink-70);
}
.site-footer a { text-decoration: underline; text-underline-offset: 2px; }
.site-footer__contact { display: flex; gap: var(--sp-5); }

/* ---------------------------------------------------------------
   Legal pages — readability first, no grid experiments
--------------------------------------------------------------- */
.legal {
  max-width: 68ch;
  padding: var(--sp-7) var(--sp-6) var(--sp-9);
}
.legal h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-top: var(--sp-8);
}
.legal h2:first-of-type { margin-top: var(--sp-6); }
.legal p, .legal li { margin-top: var(--sp-4); line-height: 1.7; color: var(--ink-70); }
.legal ul { list-style: disc; padding-left: 1.25rem; }
.legal .updated { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--ink-45); }

/* ---------------------------------------------------------------
   Responsive
--------------------------------------------------------------- */
@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .grid > .panel:nth-child(3n) { border-right: 1px solid var(--line); }
  .grid > .panel:nth-child(2n) { border-right: 0; }
  .panel--span2, .panel--span3 { grid-column: span 2; }
}

@media (max-width: 720px) {
  .shell { flex-direction: column; }
  .sidebar {
    position: sticky;
    top: 0;
    height: auto;
    flex: none;
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: var(--sp-4) var(--sp-5);
    z-index: 20;
    background: var(--paper);
  }
  .sidebar__top { display: flex; align-items: center; justify-content: space-between; }
  .nav-toggle { display: inline-flex; align-items: center; gap: var(--sp-2); }
  .nav-toggle__icon {
    width: 16px; height: 16px;
    border-top: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
    position: relative;
  }
  .nav-toggle__icon::before {
    content: "";
    position: absolute; left: 0; right: 0; top: 50%;
    border-top: 1px solid currentColor;
  }
  .primary-nav {
    display: none;
    padding-top: var(--sp-5);
  }
  .primary-nav.is-open { display: block; }
  .sidebar__foot { display: none; }

  .grid { grid-template-columns: 1fr; }
  .grid > .panel { border-right: 0 !important; grid-column: auto !important; grid-row: auto !important; }
  .panel--feature h2 { font-size: clamp(2.25rem, 10vw, 3rem); }

  .talk-cta, .case-nav { flex-direction: column; align-items: flex-start; }
  .case-nav a:first-child { border-right: 0; border-bottom: 1px solid var(--line); }
  .case-nav a.case-nav--next { text-align: left; }
}

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