/* ==========================================================================
   Components
   The system is a blueprint: square corners, hairline borders, transparent
   fills, registration marks at the corners of framed objects.
   ========================================================================== */

/* --- Blueprint frame ------------------------------------------------------
   Wrap any block in .blueprint and drop four <i class="corner"> children in
   to get the registration marks. The marks sit outside the box, so a
   blueprint wrapper must not clip its own overflow. */

.blueprint {
  position: relative;
  border: 1px solid var(--color-divider);
  border-radius: 0;
}

.blueprint > .corner {
  position: absolute;
  width: 11px;
  height: 11px;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
  pointer-events: none;
}

.blueprint > .corner::before,
.blueprint > .corner::after {
  content: "";
  position: absolute;
  background: currentColor;
}

.blueprint > .corner::before { left: 5px; top: 0; width: 1px; height: 100%; }
.blueprint > .corner::after { top: 5px; left: 0; width: 100%; height: 1px; }

.blueprint > .corner.tl { top: -6px; left: -6px; }
.blueprint > .corner.tr { top: -6px; right: -6px; }
.blueprint > .corner.bl { bottom: -6px; left: -6px; }
.blueprint > .corner.br { bottom: -6px; right: -6px; }

/* --- Media treatment ------------------------------------------------------ */

.duotone {
  position: relative;
  overflow: hidden;
}

.duotone::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-accent);
  mix-blend-mode: color;
  pointer-events: none;
}

.frame {
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.frame > img,
.frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- Buttons -------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
  border: 1px solid var(--color-divider);
  border-radius: 0;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: var(--font-heading-weight);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    background var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn svg { display: block; }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover { background: var(--color-accent-600); color: var(--color-bg); }
.btn-primary:active { background: var(--color-accent-700); }

.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }
.btn-secondary:active { background: color-mix(in srgb, var(--color-text) 14%, transparent); }

.btn-ghost {
  border-color: transparent;
  padding-inline: var(--space-1);
  color: var(--color-accent);
}

.btn-ghost:hover { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
}

.btn-sm { padding: 4px var(--space-2); font-size: 0.8rem; }
.btn-block { width: 100%; }

/* --- Forms ---------------------------------------------------------------- */

.field { margin-bottom: var(--space-3); }

.field > label {
  display: block;
  margin-bottom: 5px;
  font-size: 0.75rem;
  color: color-mix(in srgb, var(--color-text) 70%, transparent);
}

.input {
  width: 100%;
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid var(--color-divider);
  border-radius: 0;
  background: var(--color-surface);
  color: var(--color-text);
  caret-color: var(--color-accent);
  font: inherit;
  font-size: 0.875rem;
  transition: border-color var(--dur-fast) var(--ease);
}

.input:hover { border-color: color-mix(in srgb, var(--color-text) 45%, transparent); }
.input:focus-visible { border-color: var(--color-accent); outline-offset: 0; }

textarea.input { min-height: 110px; resize: vertical; }

/* Segmented control */

.seg {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--color-divider);
}

.seg-opt {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease);
}

.seg-opt input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

.seg-opt + .seg-opt { border-left: 1px solid var(--color-divider); }
.seg-opt:has(input:checked) { background: var(--color-accent); color: var(--color-bg); }
.seg-opt:not(:has(input:checked)):hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }
.seg-opt:has(input:focus-visible) { outline: 2px solid var(--color-accent); outline-offset: -2px; }

/* Range */

input[type="range"] {
  width: 100%;
  height: 20px;
  margin: 0;
  background: transparent;
  accent-color: var(--color-accent);
  cursor: pointer;
}

/* --- Cards ---------------------------------------------------------------- */

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-6);
  border: 1px solid var(--color-divider);
  border-radius: 0;
  background: transparent;
  color: inherit;
  text-decoration: none;
}

.card-kicker {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.card-title {
  font-family: var(--font-heading);
  font-weight: var(--font-heading-weight);
  font-size: 1.0625rem;
  line-height: 1.2;
}

.card-body {
  flex: 1;
  margin: 0;
  font-size: 0.8125rem;
  opacity: 0.8;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.6875rem;
  color: color-mix(in srgb, var(--color-text) 50%, transparent);
}

a.card {
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

a.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
}

a.card:hover .card-meta { color: var(--color-accent); }

.card-icon {
  color: var(--color-accent-700);
  margin-bottom: var(--space-1);
}

.elev-sm { box-shadow: var(--shadow-sm); }
.elev-md { box-shadow: var(--shadow-md); }
.elev-lg { box-shadow: var(--shadow-lg); }

/* --- Tags ----------------------------------------------------------------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 0;
  font-size: 0.6875rem;
  letter-spacing: 0.02em;
}

.tag-accent { background: var(--color-accent-100); color: var(--color-accent-800); }
.tag-accent-2 { background: var(--color-accent-2-100); color: var(--color-accent-2-800); }
.tag-neutral { background: var(--color-neutral-100); color: var(--color-neutral-800); }
.tag-outline { border: 1px solid var(--color-accent); color: var(--color-accent); }

.tag-live { border: 1px solid var(--color-highlight); color: var(--color-highlight); }

.tag-live .pip {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-highlight);
}

.tag-live .pip::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: inherit;
  animation: pip-ping 1.8s var(--ease) infinite;
}

@keyframes pip-ping {
  0% { transform: scale(1); opacity: 0.7; }
  70%,
  100% { transform: scale(2.6); opacity: 0; }
}

/* --- Tables --------------------------------------------------------------- */

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.table th {
  padding: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
  color: color-mix(in srgb, var(--color-text) 60%, transparent);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-align: left;
  text-transform: uppercase;
}

.table td {
  padding: var(--space-2);
  border-bottom: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
}

.table tbody tr:hover { background: color-mix(in srgb, var(--color-text) 4%, transparent); }

/* --- Section heading ------------------------------------------------------ */

.section-head { margin-bottom: var(--space-8); }

.section-head h6 { color: var(--color-accent-700); }

.section-head p {
  max-width: 62ch;
  margin-top: var(--space-2);
  opacity: 0.85;
}

/* --- Step list ------------------------------------------------------------ */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step {
  position: relative;
  margin: 0;
  padding: var(--space-6) var(--space-4) var(--space-4);
  border: 1px solid var(--color-divider);
  transition:
    transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: var(--space-2);
  left: var(--space-4);
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.step:hover,
.step.is-active {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 6%, transparent);
}

.step h4 { margin-bottom: var(--space-1); font-size: 1.05rem; }
.step p { margin: 0; font-size: 0.8125rem; opacity: 0.8; }

/* --- Notice --------------------------------------------------------------- */

.notice {
  padding: var(--space-4) var(--space-6);
  border: 1px solid var(--color-divider);
  border-left: 3px solid var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 5%, transparent);
  font-size: 0.875rem;
}

.notice :last-child { margin-bottom: 0; }

/* --- Scroll reveal -------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-slow) var(--ease),
    transform var(--dur-slow) var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal { opacity: 1; transform: none; }
}

/* --- Reference lists ------------------------------------------------------ */

.refs {
  font-size: 0.8125rem;
  line-height: 1.6;
}

.refs em { font-style: italic; }