/* ============================================================
   STRATUM LABS — COMPONENTS
   Nav · Buttons · Cards · Tags · Forms
   ============================================================ */

/* ── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-nav);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--rule-hairline) solid transparent;
  transition:
    border-color var(--duration-base) var(--ease-out),
    background var(--duration-base) var(--ease-out);
}

.nav--scrolled {
  border-bottom-color: var(--color-border);
}

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--section-pad-x);
  max-width: var(--content-wide);
  margin: 0 auto;
}

/* Wordmark */
.nav__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-img {
  height: 52px;
  width: auto;
  display: block;
}

/* Nav links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav__link {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--stone-800);
  letter-spacing: 0.01em;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
  padding-bottom: 2px;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: var(--rule-accent);
  background: var(--color-accent);
  transition: width var(--duration-base) var(--ease-out);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--ink);
}

.nav__link.is-active::after,
.nav__link:hover::after {
  width: 100%;
}

/* Nav CTA */
.nav__cta {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink);
  border: var(--rule-thin) solid var(--color-border);
  padding: 8px 20px;
  letter-spacing: 0.02em;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.nav__cta:hover {
  border-color: var(--ink);
}

/* Red CTA variant */
.nav__cta--red {
  background: var(--color-accent);
  color: var(--white);
  border-color: var(--color-accent);
}

.nav__cta--red:hover {
  background: #b82420;
  border-color: #b82420;
  color: var(--white);
}

/* Hamburger (mobile) */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-1);
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-base) var(--ease-out);
}

.nav__hamburger.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu — sibling of <nav>, not a child.
   Lives in the root stacking context so z-index is never trapped
   by the nav's backdrop-filter stacking context on iOS Safari.
   The nav bar (z-index 100) sits above it (z-index 99) so the
   hamburger/X is always tappable regardless of menu state. */
.nav__mobile {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: var(--white);
  padding: var(--nav-height) var(--section-pad-x) var(--space-6);
  flex-direction: column;
  gap: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
  overflow-y: auto;
}

.nav__mobile.is-open {
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 300;
  color: var(--stone-800);
  padding: var(--space-2) 0;
  border-bottom: var(--rule-hairline) solid var(--color-border);
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__mobile-link:hover {
  color: var(--ink);
}

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__cta   { display: none; }
  .nav__hamburger { display: flex; }
  .nav__mobile    { display: flex; }
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 14px 32px;
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
  cursor: pointer;
  text-decoration: none;
}

/* Primary: dark fill */
.btn--primary {
  background: var(--ink);
  color: var(--white);
  border: var(--rule-thin) solid var(--ink);
}

.btn--primary:hover {
  background: var(--stone-800);
  border-color: var(--stone-800);
}

/* Ghost: outline */
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border: var(--rule-thin) solid var(--color-border);
}

.btn--ghost:hover {
  border-color: var(--ink);
}

/* Arrow icon within button */
.btn__arrow {
  width: 16px;
  height: 16px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ── Cards ───────────────────────────────────────────────── */

/* Case study card */
.card-case {
  background: var(--color-surface);
  border-left: var(--rule-accent) solid var(--color-accent);
  padding: var(--space-5) var(--space-5) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
  overflow: hidden;
}

.card-case__label {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.card-case__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.25;
}

.card-case__body {
  font-size: var(--text-small);
  line-height: 1.7;
  color: var(--color-text-soft);
}

.card-case__counterfactual {
  border-top: var(--rule-hairline) solid var(--color-border);
  padding-top: var(--space-3);
  margin-top: auto;
}

.card-case__counterfactual-label {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--stone-500);
  margin-bottom: var(--space-1);
}

.card-case__counterfactual-text {
  font-size: var(--text-small);
  font-style: italic;
  color: var(--color-text-soft);
  line-height: 1.6;
}

/* Gap column card */
.card-gap {
  padding: var(--space-5) var(--space-4);
  border-top: var(--rule-heavy) solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color var(--duration-base) var(--ease-out);
}

.card-gap:hover {
  border-top-color: var(--stone-500);
}

.card-gap__type {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone-500);
}

.card-gap__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 500;
  color: var(--ink);
}

.card-gap__body {
  font-size: var(--text-small);
  color: var(--color-text-soft);
  line-height: 1.7;
}

.card-gap__limit {
  font-size: var(--text-small);
  color: var(--stone-500);
  font-style: italic;
  margin-top: var(--space-1);
  padding-top: var(--space-2);
  border-top: var(--rule-hairline) solid var(--color-border);
}

/* Scenario card (Who This Serves) */
.card-scenario {
  padding: var(--space-4) var(--space-4) var(--space-5);
  border: var(--rule-thin) solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition:
    border-color var(--duration-base) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.card-scenario:hover {
  border-color: var(--stone-500);
  transform: translateY(-4px);
}

.card-scenario__if {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.card-scenario__condition {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 500;
  color: var(--ink);
  line-height: 1.3;
}

.card-scenario__body {
  font-size: var(--text-small);
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-top: var(--space-1);
}

/* Architecture block */
.arch-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: var(--rule-thin) solid var(--color-border);
}

.arch-block__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.arch-block__number {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  flex-shrink: 0;
}

.arch-block__name {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: 500;
  color: var(--ink);
}

.arch-block__descriptor {
  font-family: var(--font-body);
  font-size: var(--text-h2);
  font-weight: 400;
  font-style: italic;
  color: var(--stone-500);
}

.arch-block__body {
  max-width: 600px;
}

/* Standard item */
.standard-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-3);
  align-items: start;
  padding: var(--space-4) 0;
  border-bottom: var(--rule-hairline) solid var(--color-border);
}

.standard-item__num {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  font-weight: 300;
  color: var(--color-accent);
  line-height: 1;
  padding-top: 4px;
}

.standard-item__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: var(--space-1);
}

.standard-item__body {
  font-size: var(--text-small);
  color: var(--color-text-soft);
  line-height: 1.7;
}

/* ── Environment reframe cards ───────────────────────────── */
.env-card {
  background: var(--white);
  border: var(--rule-thin) solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--duration-story) var(--ease-out),
    transform var(--duration-story) var(--ease-out);
}

.env-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.env-card__env {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone-500);
}

.env-card__register {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--ink);
}

.env-card__reception {
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-style: italic;
  color: var(--color-text-soft);
  line-height: 1.6;
  margin-top: var(--space-1);
}

.env-card__register-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 2px;
  margin-top: var(--space-1);
}

.env-card__register-tag--fear    { background: #FEF2F2; color: #991B1B; }
.env-card__register-tag--stigma  { background: #FFF7ED; color: #9A3412; }
.env-card__register-tag--curiosity { background: #F0FDF4; color: #166534; }
.env-card__register-tag--contempt { background: #FEF9C3; color: #854D0E; }
.env-card__register-tag--grief   { background: #F5F3FF; color: #6B21A8; }
.env-card__register-tag--trust   { background: #EFF6FF; color: #1E40AF; }
.env-card__register-tag--pride   { background: #ECFDF5; color: #065F46; }

/* ── Sample output artifact ──────────────────────────────── */
.sample-output {
  background: var(--color-surface);
  border: var(--rule-thin) solid var(--color-border);
  padding: var(--space-4);
  font-family: var(--font-display);
}

.sample-output__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-2);
  border-bottom: var(--rule-thin) solid var(--color-border);
  margin-bottom: var(--space-3);
}

.sample-output__title {
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone-500);
}

.sample-output__tag {
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--white);
  padding: 3px 8px;
}

.sample-output__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-1) 0;
  border-bottom: var(--rule-hairline) solid var(--color-border);
  font-size: 0.75rem;
}

.sample-output__narrative {
  color: var(--stone-800);
}

.sample-output__stage {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 6px;
  border-radius: 2px;
}

.sample-output__stage--accelerating { background: #FEF2F2; color: #991B1B; }
.sample-output__stage--plateauing   { background: #FFF7ED; color: #9A3412; }
.sample-output__stage--receding     { background: #F0FDF4; color: #166534; }
.sample-output__stage--emerging     { background: #EFF6FF; color: #1E40AF; }

/* ── Shunya position list ────────────────────────────────── */
.shunya-positions {
  display: flex;
  flex-direction: column;
  border-top: var(--rule-thin) solid var(--color-border);
  margin-bottom: 0;
}

.shunya-pos {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 0;
  border-bottom: var(--rule-thin) solid var(--color-border);
}

.shunya-pos__id {
  font-family: var(--font-display);
  font-size: 0.5625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--stone-500);
  min-width: 34px;
  flex-shrink: 0;
}

.shunya-pos--active .shunya-pos__id {
  color: var(--color-accent);
}

.shunya-pos__type {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--stone-500);
  flex: 1;
}

.shunya-pos--active .shunya-pos__type {
  color: var(--ink);
  font-weight: 500;
}

.shunya-pos__open {
  font-size: 0.625rem;
  color: var(--stone-500);
  flex-shrink: 0;
}

.sample-output__bar-row {
  padding: var(--space-1) 0;
}

.sample-output__bar-label {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stone-500);
  margin-bottom: 4px;
  display: flex;
  justify-content: space-between;
}

.sample-output__bar-track {
  height: 4px;
  background: var(--stone-200);
  border-radius: 2px;
  overflow: hidden;
}

.sample-output__bar-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 2px;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 1.2s var(--ease-out);
}

.sample-output__bar-fill.animate {
  transform: scaleX(1);
}

/* ── Briefing form ───────────────────────────────────────── */
.form-briefing {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-field label {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--stone-500);
}

.form-field__req {
  color: var(--color-accent);
  font-size: 0.625rem;
}

.form-field__opt {
  color: var(--stone-500);
  font-size: 0.5625rem;
  letter-spacing: 0.06em;
  text-transform: none;
  font-weight: 300;
  opacity: 0.7;
}

.form-field input,
.form-field textarea {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: var(--rule-thin) solid var(--color-border);
  padding: var(--space-2) 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--ink);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-out);
  resize: none;
}

.form-field input:focus,
.form-field textarea:focus {
  border-bottom-color: var(--ink);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--stone-500);
}

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  background: var(--ink);
  color: var(--white);
  padding: var(--space-7) var(--section-pad-x) var(--space-5);
}

.footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
}

.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: var(--space-6);
  border-bottom: var(--rule-hairline) solid var(--stone-800);
  gap: var(--space-6);
}

.footer__mission {
  font-family: var(--font-body);
  font-size: var(--text-h2);
  font-style: italic;
  color: var(--stone-200);
  max-width: 480px;
  line-height: 1.5;
}

.footer__links {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  align-items: center;
}

.footer__link {
  font-family: var(--font-display);
  font-size: 0.8125rem;
  color: var(--stone-500);
  letter-spacing: 0.02em;
  transition: color var(--duration-fast) var(--ease-out);
}

.footer__link:hover {
  color: var(--white);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-4);
}

.footer__copy {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.08em;
  color: var(--stone-500);
}

.footer__restricted {
  font-family: var(--font-display);
  font-size: var(--text-caption);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stone-800);
}

@media (max-width: 768px) {
  .footer__top {
    flex-direction: column;
  }
}