/* =============================================================================
   Digital Atrium — Components
   Carved objects: tesserae buttons, tonal cards, glass header, forms, lists.
   ============================================================================= */

/* --- Header / frosted marble --- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-height);
  background: var(--glass-surface);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-header);
}

.site-header__inner {
  height: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

@media (min-width: 1024px) {
  .site-header__inner {
    padding-inline: var(--gutter-lg);
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand img {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
}

.brand span {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 1.75rem;
  font-family: var(--font-label);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--color-on-surface-variant);
  padding-block: 0.25rem;
  transition: color var(--ease);
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--color-primary);
}

.site-nav a.is-active {
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-toggle {
  display: flex;
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
  color: var(--color-on-surface);
  background: var(--color-surface-container-high);
  border-radius: var(--radius);
}

@media (min-width: 900px) {
  .site-nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  inset-inline: 0;
  z-index: 40;
  padding: var(--space-6);
  background: var(--glass-surface);
  backdrop-filter: blur(var(--glass-blur));
  flex-direction: column;
  gap: var(--space-4);
  font-family: var(--font-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.8rem;
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav a {
  padding: var(--space-3);
  background: var(--color-surface-container-low);
  border-radius: var(--radius);
  color: var(--color-on-surface-variant);
}

.mobile-nav a.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.site-header--on-dark {
  background: color-mix(in srgb, var(--color-inverse-surface) 72%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-inverse-on-surface) 8%, transparent);
  box-shadow: none;
}

.brand--light span {
  color: var(--color-inverse-on-surface);
}

.site-nav--light a {
  color: color-mix(in srgb, var(--color-inverse-on-surface) 62%, transparent);
}

.site-nav--light a:hover,
.site-nav--light a.is-active {
  color: var(--color-inverse-primary);
}

.nav-toggle--light {
  color: var(--color-inverse-on-surface);
  background: color-mix(in srgb, var(--color-inverse-on-surface) 10%, transparent);
}

.mobile-nav--dark {
  background: color-mix(in srgb, var(--color-inverse-surface) 96%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-inverse-on-surface) 8%, transparent);
}

.mobile-nav--dark a {
  background: color-mix(in srgb, var(--color-inverse-on-surface) 6%, transparent);
  color: color-mix(in srgb, var(--color-inverse-on-surface) 75%, transparent);
}

.mobile-nav--dark a.is-active {
  color: var(--color-inverse-primary);
}

/* --- Buttons: tesserae --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: var(--radius);
  font-family: var(--font-label);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: background var(--ease), transform var(--ease), box-shadow var(--ease);
  text-align: center;
}

.btn--primary,
.btn--solid {
  background: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: var(--shadow-btn);
}

.btn--primary:hover,
.btn--solid:hover {
  background: var(--color-primary-container);
  box-shadow: var(--shadow-btn-hover);
}

.btn--quiet {
  background: var(--color-surface-container-high);
  color: var(--color-on-surface);
}

.btn--quiet:hover {
  background: var(--color-surface-container);
}

.btn--tertiary {
  padding-inline: 0;
  font-family: var(--font-headline);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-on-surface);
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-underline-offset: 0.28em;
  text-decoration-thickness: 1px;
}

.btn--block {
  width: 100%;
}

.btn--lg {
  padding: 1rem 2rem;
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.65rem;
}

.btn--xl {
  padding: 1.15rem 2.5rem;
  font-size: 0.8rem;
}

/* --- Cards: no borders, tonal lift --- */

.card {
  background: var(--color-surface-container-low);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-6);
}

.card--lowest {
  background: var(--color-surface-container-lowest);
}

.card--mid {
  background: var(--color-surface-container);
}

.card--high {
  background: var(--color-surface-container-high);
}

.card--surface {
  background: var(--color-surface);
}

.card--glow {
  box-shadow: var(--shadow-ambient);
}

.card h3 + p,
.card h3 + ul {
  margin-top: var(--space-3);
}

.card-foot {
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 600;
}

/* --- Badges --- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius);
  background: var(--color-surface-container-high);
  color: var(--color-primary);
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.badge--dot::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: var(--radius);
  background: var(--color-primary);
}

.badge--ok {
  background: var(--color-primary-fixed);
  color: var(--color-on-primary-fixed);
}

.badge--warn {
  background: var(--color-error-container);
  color: var(--color-on-error-container);
}

/* --- Lists without dividers --- */

.check-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-size: 0.95rem;
  color: var(--color-on-surface-variant);
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}

.check-list .material-symbols-outlined {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-top: 0.1rem;
}

.check-list--no .material-symbols-outlined {
  color: var(--color-outline);
}

.metric {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface-container-lowest);
  border-radius: var(--radius-lg);
}

.metric__value {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  color: var(--color-primary);
  font-weight: 400;
}

.metric__label {
  margin-top: 0.45rem;
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
}

.metric__hint {
  margin-top: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-tertiary);
}

/* --- Forms --- */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.field label {
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-on-surface);
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  background: var(--color-surface-container-low);
  color: var(--color-on-surface);
  border: 1px solid var(--color-ghost-border);
  outline: none;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  box-shadow: 0 0 0 1px var(--color-primary);
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
}

.check input {
  margin-top: 0.15rem;
  accent-color: var(--color-primary);
}

.form-grid {
  display: grid;
  gap: var(--space-6);
}

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

/* --- FAQ --- */

.faq {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.faq details {
  background: var(--color-surface-container-low);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.faq summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  cursor: pointer;
  font-family: var(--font-headline);
  font-size: 1.15rem;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq p {
  margin-top: var(--space-4);
  color: var(--color-on-surface-variant);
  font-size: 0.925rem;
  line-height: 1.7;
}

.faq ul {
  margin: 0.65rem 0 0;
  padding: 0;
  list-style: none;
}

.faq li {
  position: relative;
  padding-left: 1rem;
  color: var(--color-on-surface-variant);
  font-size: 0.925rem;
  line-height: 1.7;
}

.faq li + li {
  margin-top: 0.15rem;
}

.faq li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.4rem;
  height: 1px;
  background: var(--color-primary);
}

.faq__panel {
  overflow: hidden;
  transition: height 360ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.faq .material-symbols-outlined {
  color: var(--color-primary);
  transition: transform 280ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.faq details[open]:not(.is-closing) .material-symbols-outlined {
  transform: rotate(180deg);
}

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

/* --- Footer --- */

.site-footer {
  background: var(--color-surface-container-low);
  color: var(--color-on-surface-variant);
  padding: var(--space-16) var(--gutter) var(--space-12);
}

.site-footer__inner {
  max-width: var(--measure);
  margin-inline: auto;
}

@media (min-width: 1024px) {
  .site-footer {
    padding-inline: var(--gutter-lg);
  }
}

.site-footer__top {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .site-footer__top {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
  }
}

.site-footer .brand span {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 400;
}

.site-footer__tagline {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 0.95rem;
  max-width: 28rem;
  margin-top: var(--space-3);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-footer nav a:hover,
.site-footer nav a.is-active {
  color: var(--color-primary);
}

.site-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  text-align: center;
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-outline);
}

@media (min-width: 640px) {
  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* --- Section heads --- */

.section-head {
  margin-bottom: var(--space-12);
}

.section-head--center {
  text-align: center;
  max-width: 56rem;
  margin-inline: auto;
}

.section-head .display {
  margin-top: var(--space-2);
}

.section-head .lede {
  margin-top: var(--space-3);
  margin-inline: auto;
}

.section-head--split {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .section-head--split {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .section-head--split .lede {
    margin: 0;
    max-width: 22rem;
  }
}

.quote {
  padding: var(--space-8);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
}

.quote p {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--color-on-surface);
}

.quote cite {
  display: block;
  margin-top: var(--space-4);
  font-family: var(--font-label);
  font-size: 0.7rem;
  font-style: normal;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 600;
}

.stars {
  display: flex;
  gap: 0.1rem;
  color: var(--color-primary);
}

.stars .material-symbols-outlined {
  font-size: 1.1rem;
  font-variation-settings: "FILL" 1, "wght" 400, "GRAD" 0, "opsz" 24;
}

.numeral {
  font-family: var(--font-headline);
  font-size: 2.25rem;
  color: color-mix(in srgb, var(--color-primary) 40%, transparent);
}

.cta-band {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
}

.cta-band .lede {
  margin-inline: auto;
}

.hint {
  font-family: var(--font-label);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-outline);
}