/* =========================================================================
   White Studio LLC — stylesheet
   Palette: off-white ground, near-black text, deep-black accent.
   No external resources. System font stack only.
   ========================================================================= */

/* --- Design tokens ------------------------------------------------------ */

:root {
  /* Colour */
  --ground:        #F7F6F3;  /* off-white page ground                        */
  --ground-alt:    #FFFFFF;  /* alternating band                             */
  --ink:           #0F0F0E;  /* near-black body text                         */
  --ink-strong:    #000000;  /* deep black — the single accent               */
  --ink-muted:     #56564F;  /* secondary text (6.8:1 on ground)             */
  --ink-faint:     #6E6E64;  /* labels, indices, disclaimer (4.8:1)          */
  --rule:          #DFDCD4;  /* hairlines (decorative)                       */
  --rule-strong:   #C4C0B6;  /* heavier hairlines (decorative)               */
  --control-edge:  #8D8980;  /* form control borders — 3.5:1, WCAG 1.4.11    */

  /* Typography */
  --font-sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif,
    "Apple Color Emoji", "Segoe UI Emoji";

  --step--1: clamp(0.8125rem, 0.79rem + 0.11vw, 0.875rem);
  --step-0:  clamp(1rem, 0.96rem + 0.20vw, 1.125rem);
  --step-1:  clamp(1.125rem, 1.05rem + 0.36vw, 1.375rem);
  --step-2:  clamp(1.375rem, 1.22rem + 0.75vw, 1.875rem);
  --step-3:  clamp(1.75rem, 1.45rem + 1.5vw, 2.75rem);
  --step-4:  clamp(2.5rem, 1.6rem + 4.4vw, 5.5rem);

  /* Space */
  --gutter:  clamp(1.25rem, 0.9rem + 1.7vw, 2.5rem);
  --section: clamp(4.5rem, 3rem + 7vw, 9rem);
  --measure: 62ch;

  --wrap: 68rem;
  --header-h: 4.5rem;
}

/* --- Reset -------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.5rem);
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  margin: 0;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }
ul { margin: 0; padding: 0; }
dl, dd { margin: 0; }
address { font-style: normal; }

img, svg { max-width: 100%; height: auto; display: block; }

::selection { background: var(--ink-strong); color: var(--ground); }

/* --- Shared utilities --------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.link {
  color: var(--ink-strong);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 100% 1px;
  padding-bottom: 0.08em;
  transition: background-size 180ms ease, color 180ms ease;
}
.link:hover { background-size: 0 1px; }

:where(a, button):focus-visible {
  outline: 2px solid var(--ink-strong);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translate(-50%, -120%);
  z-index: 100;
  background: var(--ink-strong);
  color: var(--ground);
  padding: 0.75rem 1.25rem;
  font-size: var(--step--1);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.skip-link:focus-visible { transform: translate(-50%, 0); outline-offset: -4px; }

.eyebrow,
.section-index,
.wordmark-suffix,
.card-index {
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
}

/* --- Header ------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--ground) 88%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, background-color 200ms ease;
}
.site-header[data-scrolled="true"] { border-bottom-color: var(--rule); }

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink-strong);
}
.wordmark-text {
  font-size: var(--step-0);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.wordmark-suffix { letter-spacing: 0.16em; }

.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.4vw, 2.25rem);
  list-style: none;
}
.site-nav a {
  display: inline-block;
  color: var(--ink-muted);
  text-decoration: none;
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  padding-block: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.site-nav a:hover { color: var(--ink-strong); }
.site-nav a[aria-current="true"] {
  color: var(--ink-strong);
  border-bottom-color: var(--ink-strong);
}

/* Mobile toggle — hidden on wide viewports */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  background: none;
  border: 0;
  padding: 0.5rem 0;
  margin: 0;
  cursor: pointer;
  color: var(--ink-strong);
  font: inherit;
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.nav-toggle-bars { display: grid; gap: 5px; width: 22px; }
.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child {
  transform: translateY(3.25px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

@media (max-width: 47.99em) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    inset: 100% 0 auto 0;
    background: var(--ground);
    border-bottom: 0 solid var(--rule);
    display: grid;
    grid-template-rows: 0fr;
    visibility: hidden;
    transition: grid-template-rows 260ms ease, visibility 260ms;
  }
  .site-nav > ul {
    overflow: hidden;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-inline: var(--gutter);
  }
  .site-nav[data-open="true"] {
    grid-template-rows: 1fr;
    visibility: visible;
    border-bottom-width: 1px;
  }

  .site-nav a {
    padding-block: 1rem;
    font-size: var(--step-0);
    letter-spacing: 0.02em;
    border-bottom: 1px solid var(--rule);
  }
  .site-nav li:last-child a { border-bottom: 0; padding-bottom: 1.5rem; }
  .site-nav a[aria-current="true"] { border-bottom-color: var(--rule); }
}

/* --- Hero --------------------------------------------------------------- */

.hero {
  padding-block: clamp(4rem, 2rem + 11vw, 10rem) 0;
}
.hero .eyebrow { margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }

.hero-title {
  font-size: var(--step-4);
  letter-spacing: -0.035em;
  font-weight: 500;
  max-width: 16ch;
}
.hero-title-sub {
  display: block;
  margin-top: clamp(0.5rem, 1.4vw, 1rem);
  font-size: var(--step-2);
  letter-spacing: -0.015em;
  font-weight: 400;
  color: var(--ink-muted);
}

.hero-lead {
  margin-top: clamp(2rem, 4vw, 3rem);
  max-width: 34ch;
  font-size: var(--step-1);
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.hero-actions {
  margin-top: clamp(2.25rem, 4vw, 3rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.hero-rule {
  margin-top: clamp(4rem, 8vw, 7rem);
  height: 1px;
  background: var(--rule);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.75rem;
  background: var(--ink-strong);
  color: var(--ground);
  text-decoration: none;
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
  border: 1px solid var(--ink-strong);
  transition: background-color 180ms ease, color 180ms ease;
}
.button:hover { background: transparent; color: var(--ink-strong); }

.button-quiet {
  background: transparent;
  color: var(--ink-strong);
  border-color: var(--control-edge);
}
.button-quiet:hover { border-color: var(--ink-strong); background: transparent; }

/* --- Sections ----------------------------------------------------------- */

.section { padding-block: var(--section); }
.section-alt { background: var(--ground-alt); }

.section-grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
}

@media (min-width: 60em) {
  .section-grid {
    grid-template-columns: 14rem minmax(0, 1fr);
    gap: clamp(3rem, 6vw, 6rem);
  }
  .section-head {
    position: sticky;
    top: calc(var(--header-h) + 3rem);
    align-self: start;
  }
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}
.section-index { color: var(--ink-faint); }
.section-title {
  font-size: var(--step-2);
  font-weight: 500;
  letter-spacing: -0.015em;
}

.section-body > * + * { margin-top: 1.25em; }

.lead {
  font-size: var(--step-1);
  line-height: 1.5;
  letter-spacing: -0.01em;
  max-width: 46ch;
  color: var(--ink);
}
.section-body .lead + * { margin-top: clamp(1.75rem, 3vw, 2.5rem); }

.prose p { max-width: var(--measure); color: var(--ink-muted); }
.prose p.lead { color: var(--ink); }

.note {
  font-size: var(--step--1);
  color: var(--ink-muted);
  max-width: var(--measure);
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

/* --- Approach cards ----------------------------------------------------- */

.cards {
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--rule);
  border-block: 1px solid var(--rule);
}
@media (min-width: 48em) {
  .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.card {
  background: var(--ground-alt);
  padding: clamp(1.75rem, 3vw, 2.25rem) clamp(1.25rem, 2.5vw, 1.75rem);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.card-index { color: var(--ink-faint); letter-spacing: 0.2em; }
.card-title {
  font-size: var(--step-1);
  font-weight: 500;
  letter-spacing: -0.012em;
  line-height: 1.25;
}
.card-text {
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--ink-muted);
  margin-top: 0.25rem;
}

/* --- Fact lists (Governance, Contact) ----------------------------------- */

.facts { border-top: 1px solid var(--rule); }

.fact {
  display: grid;
  gap: 0.35rem;
  padding-block: clamp(1.1rem, 2vw, 1.5rem);
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 40em) {
  .fact {
    grid-template-columns: minmax(9rem, 14rem) minmax(0, 1fr);
    gap: 2rem;
    align-items: baseline;
  }
}

.fact dt {
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}
.fact dd { color: var(--ink); max-width: 46ch; line-height: 1.6; }

/* --- Contact panel (slide-over) ----------------------------------------- */

.panel {
  position: fixed;
  inset: 0 0 0 auto;
  z-index: 60;
  width: min(30rem, 100%);
  max-width: 100%;
  height: 100%;
  max-height: 100%;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--ground);
  color: var(--ink);
  border: 0;
  border-left: 1px solid var(--rule);
  transform: translateX(100%);
  transition: transform 320ms cubic-bezier(0.32, 0.72, 0, 1);
}
.panel[data-open="true"] { transform: translateX(0); }

.panel::backdrop {
  background: rgba(15, 15, 14, 0);
  transition: background-color 320ms ease;
}
.panel[data-open="true"]::backdrop { background: rgba(15, 15, 14, 0.34); }

.panel-inner {
  min-height: 100%;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);
}
.panel-title {
  font-size: var(--step-2);
  font-weight: 500;
  letter-spacing: -0.015em;
}

.panel-close {
  flex: none;
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  margin: -0.5rem -0.5rem 0 0;
  padding: 0;
  background: none;
  border: 0;
  color: var(--ink-muted);
  cursor: pointer;
  transition: color 160ms ease;
}
.panel-close:hover { color: var(--ink-strong); }

.panel-intro {
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--ink-muted);
  max-width: 42ch;
}

/* --- Form --------------------------------------------------------------- */

.form { display: flex; flex-direction: column; gap: 1.25rem; margin: 0; }

.field { display: flex; flex-direction: column; gap: 0.5rem; margin: 0; }

.field label {
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}

.field input,
.field textarea {
  font: inherit;
  font-size: var(--step-0);
  color: var(--ink);
  background: var(--ground-alt);
  border: 1px solid var(--control-edge);
  border-radius: 0;
  padding: 0.75rem 0.875rem;
  width: 100%;
  min-height: 3rem;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.field textarea { min-height: 9rem; resize: vertical; line-height: 1.6; }

.field input:hover,
.field textarea:hover { border-color: var(--ink-muted); }

.field input:focus-visible,
.field textarea:focus-visible {
  outline: 0;
  border-color: var(--ink-strong);
  box-shadow: inset 0 0 0 1px var(--ink-strong);
}

/* Only flag fields the user has actually interacted with and left invalid. */
.field input:user-invalid,
.field textarea:user-invalid { border-color: #8C2F1F; }

.field-hint {
  font-size: var(--step--1);
  color: var(--ink-faint);
}

/* Spam trap — removed from the accessibility tree and from view. */
.field-trap {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.form-submit { align-self: flex-start; margin-top: 0.25rem; }
.form-submit[disabled] { opacity: 0.55; cursor: progress; }

.form-status:empty { display: none; }
.form-status {
  font-size: var(--step--1);
  line-height: 1.6;
  padding: 0.875rem 1rem;
  border: 1px solid var(--rule);
  background: var(--ground-alt);
  color: var(--ink);
}
.form-status[data-state="error"] { border-color: #8C2F1F; color: #7A2A1B; }
.form-status[data-state="sent"]  { border-color: var(--ink-strong); }

.form-legal {
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--ink-faint);
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

/* The panel is a full-height sheet on phones. */
@media (max-width: 30em) {
  .panel { width: 100%; border-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .panel { transition: none; }
  .panel::backdrop { transition: none; }
}

/* --- Confirmation page -------------------------------------------------- */

/* The endpoint redirects to /thank-you.html on success and to
   /thank-you.html#error on failure; :target picks the state, so the page
   works with JavaScript disabled. */
.outcome-error { display: none; }
#error:target { display: block; }
#error:target ~ .outcome-success { display: none; }

/* --- Footer ------------------------------------------------------------- */

.site-footer {
  padding-block: clamp(3rem, 6vw, 5rem) clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--rule);
  background: var(--ground);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem 2rem;
  padding-bottom: clamp(2rem, 4vw, 3rem);
}
.wordmark-footer { color: var(--ink-strong); }

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.75rem;
  list-style: none;
}
.footer-nav a {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  transition: color 160ms ease;
}
.footer-nav a:hover { color: var(--ink-strong); }

.footer-meta {
  font-size: var(--step--1);
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--rule);
}
.disclaimer {
  margin-top: 1rem;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--ink-faint);
  max-width: 70ch;
}

/* --- Preferences -------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-contrast: more) {
  :root {
    --ink-muted: #2C2C28;
    --ink-faint: #3C3C36;
    --rule: #9C988E;
    --rule-strong: #6E6A62;
    --control-edge: #4A473F;
  }
}

@media print {
  .site-header, .nav-toggle, .hero-actions, .footer-nav, .skip-link { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  .section, .hero { padding-block: 1.5rem; }
  .cards { grid-template-columns: 1fr; }
  a[href^="http"]::after, a[href^="mailto"]::after { content: " (" attr(href) ")"; }
}