/* AAS-2 product page.
 *
 * Scoped to `.a2-` so it can change without touching the rest of the site.
 * The page follows the shared paper theme: hairline rules, one ink accent,
 * mono for anything that is data, colour only where it means something.
 */

.a2-main {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 4px;
}

.a2-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted-ink);
}

.a2-eyebrow::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(47, 158, 107, 0.12);
}

.a2-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 50px;
  padding: 0 24px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--foreground);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
  cursor: pointer;
  transition: background 0.22s var(--ease-out), border-color 0.22s var(--ease-out),
    transform 0.22s var(--ease-out), color 0.22s var(--ease-out);
}

.a2-btn:hover {
  border-color: rgba(28, 25, 22, 0.55);
  transform: translateY(-1px);
}

.a2-btn--solid {
  background: var(--foreground);
  border-color: var(--foreground);
  color: var(--surface-paper);
}

.a2-btn--solid:hover {
  background: #000;
  border-color: #000;
}

.a2-btn svg {
  width: 16px;
  height: 16px;
}

.a2-btn[disabled] {
  opacity: 0.55;
  cursor: progress;
  transform: none;
}

.a2-i {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.a2-nav-ico {
  width: 16px;
  height: 16px;
  display: inline-block;
  vertical-align: -2px;
}

/* ----------------------------------------------------------------- hero */

.a2-hero {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 64px;
  padding: 96px 0 104px;
}

.a2-hero h1 {
  margin: 22px 0 24px;
  font-size: clamp(46px, 5.7vw, 78px);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.032em;
  word-spacing: 0.04em;
  max-width: 640px;
}

.a2-lead {
  max-width: 500px;
  margin: 0 0 34px;
  font-size: 18px;
  line-height: 1.62;
  color: var(--muted-ink);
}

.a2-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.a2-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 42px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-meta span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.a2-meta span::before {
  content: "";
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--dim-ink);
}

/* ---------------------------------------------------------- proof object */

.a2-stage {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-right: 66px;
  perspective: 1400px;
}

.a2-stage::before {
  content: "";
  position: absolute;
  inset: -18% -8%;
  background-image: radial-gradient(rgba(28, 25, 22, 0.16) 0.7px, transparent 0.7px);
  background-size: 18px 18px;
  mask-image: radial-gradient(ellipse at 50% 50%, #000 25%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 50%, #000 25%, transparent 72%);
  opacity: 0.5;
  pointer-events: none;
}

.a2-stage::after {
  content: "";
  position: absolute;
  width: 62%;
  height: 34px;
  bottom: 34px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(28, 25, 22, 0.16), transparent 70%);
  filter: blur(14px);
  pointer-events: none;
}

.a2-receipt {
  position: relative;
  z-index: 2;
  width: 368px;
  padding: 24px 24px 22px;
  border: 1px solid rgba(28, 25, 22, 0.14);
  border-radius: 18px;
  background: linear-gradient(160deg, #fffefb 0%, #fbf7f0 100%);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.9) inset,
    0 2px 4px rgba(28, 25, 22, 0.04),
    0 28px 60px rgba(28, 25, 22, 0.13),
    0 6px 18px rgba(28, 25, 22, 0.06);
  transform: rotateY(-13deg) rotateX(5deg) rotateZ(-2deg);
  transform-style: preserve-3d;
  transition: transform 0.9s var(--ease-soft);
  /* Only opacity: a keyframed transform would overwrite the 3D pose. */
  animation: a2-fade 0.9s var(--ease-out) 0.1s both;
}

.a2-stage:hover .a2-receipt {
  transform: rotateY(-6deg) rotateX(2deg) rotateZ(-0.6deg);
}

.a2-receipt::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(28, 25, 22, 0.055);
  border-radius: 12px;
  pointer-events: none;
}

.a2-receipt-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(28, 25, 22, 0.1);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted-ink);
}

.a2-receipt-head img {
  width: 20px;
  height: 20px;
  opacity: 0.85;
}

.a2-receipt-head .a2-receipt-no {
  margin-left: auto;
  color: var(--dim-ink);
}

.a2-receipt-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 20px 0 18px;
}

.a2-receipt-title b {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.a2-receipt-title span {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-receipt-rows {
  display: grid;
  gap: 10px;
  padding-bottom: 18px;
}

.a2-receipt-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 12.5px;
}

.a2-receipt-row span {
  color: var(--muted-ink);
}

.a2-receipt-row b {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.a2-receipt-row b.good {
  color: var(--success);
}

.a2-receipt-hash {
  display: grid;
  gap: 5px;
  padding: 12px 12px 11px;
  border: 1px solid rgba(28, 25, 22, 0.09);
  border-radius: 9px;
  background: rgba(28, 25, 22, 0.025);
}

.a2-receipt-hash span {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-receipt-hash code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: -0.01em;
  color: var(--foreground);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.a2-receipt-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
}

.a2-seal {
  display: flex;
  align-items: center;
  gap: 9px;
}

.a2-seal-ring {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(47, 158, 107, 0.45);
  border-radius: 50%;
  color: var(--success);
  background: rgba(47, 158, 107, 0.06);
  box-shadow: 0 0 0 4px rgba(47, 158, 107, 0.05);
}

.a2-seal-ring svg {
  width: 18px;
  height: 18px;
}

.a2-seal-text {
  display: grid;
  gap: 2px;
}

.a2-seal-text b {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--success);
}

.a2-seal-text span {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.05em;
  color: var(--dim-ink);
}

.a2-barcode {
  width: 62px;
  height: 26px;
  opacity: 0.32;
  background: repeating-linear-gradient(
    90deg,
    var(--foreground) 0 1px,
    transparent 1px 3px,
    var(--foreground) 3px 5px,
    transparent 5px 6px
  );
}

/* Anchor rail */

.a2-rail {
  position: absolute;
  z-index: 3;
  right: 0;
  top: 58px;
  display: grid;
  gap: 0;
  padding-left: 22px;
  animation: a2-rise 0.9s var(--ease-out) 0.25s both;
}

.a2-rail::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent,
    rgba(28, 25, 22, 0.22) 12%,
    rgba(28, 25, 22, 0.22) 88%,
    transparent
  );
}

.a2-rail-item {
  position: relative;
  padding: 0 0 30px 0;
}

.a2-rail-item:last-child {
  padding-bottom: 0;
}

.a2-rail-item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--surface-paper);
  border: 1px solid rgba(28, 25, 22, 0.45);
}

.a2-rail-item.is-live::before {
  background: var(--foreground);
  border-color: var(--foreground);
  box-shadow: 0 0 0 4px rgba(28, 25, 22, 0.07);
}

.a2-rail-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-rail-value {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--foreground);
  font-variant-numeric: tabular-nums;
}

@keyframes a2-rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes a2-fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* --------------------------------------------------------------- section */

.a2-section {
  padding: 96px 0;
  border-top: 1px solid var(--rule);
}

.a2-section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 52px;
}

.a2-section-head h2 {
  margin: 16px 0 0;
  font-size: clamp(30px, 3.6vw, 46px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.028em;
  word-spacing: 0.03em;
}

.a2-section-sub {
  max-width: 520px;
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--muted-ink);
}

.a2-link {
  color: var(--foreground);
  border-bottom: 1px solid rgba(28, 25, 22, 0.3);
  transition: border-color 0.2s;
}

.a2-link:hover {
  border-color: var(--foreground);
}

/* ---------------------------------------------------------------- levels */

.a2-levels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule);
}

.a2-level {
  position: relative;
  padding: 30px 30px 34px;
  border-bottom: 1px solid var(--rule);
  transition: background 0.3s var(--ease-out);
}

.a2-level + .a2-level {
  border-left: 1px solid var(--rule);
}

.a2-level:hover {
  background: rgba(255, 253, 249, 0.7);
}

.a2-level-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 34px;
}

.a2-level-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--rule);
  border-radius: 11px;
  color: var(--foreground);
  background: var(--surface-paper);
}

.a2-level-id {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--dim-ink);
}

.a2-level h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.a2-level p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted-ink);
  min-height: 68px;
}

.a2-level-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-level-tag::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
}

.a2-level-tag.onchain {
  color: var(--success);
}

/* -------------------------------------------------------------- verifier */

.a2-verify .a2-section-head {
  margin-bottom: 40px;
}

.a2-verifier {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  border: 1px solid var(--rule);
  border-radius: 18px;
  background: var(--surface-paper);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.a2-form {
  min-width: 0;
  padding: 26px 26px 28px;
  border-right: 1px solid var(--rule);
  background: linear-gradient(180deg, rgba(247, 244, 239, 0.5), rgba(255, 253, 249, 0) 45%);
}

.a2-tabs {
  display: flex;
  min-width: 0;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: rgba(28, 25, 22, 0.035);
}

.a2-tab {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  height: 36px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted-ink);
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.a2-tab:hover {
  color: var(--foreground);
}

.a2-tab[aria-selected="true"] {
  background: var(--surface-paper);
  color: var(--foreground);
  box-shadow: 0 1px 2px rgba(28, 25, 22, 0.08);
}

.a2-pane {
  min-width: 0;
  padding-top: 22px;
}

.a2-pane[hidden] {
  display: none;
}

.a2-pane-lead {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted-ink);
}

.a2-artifacts {
  display: grid;
  gap: 8px;
  margin-bottom: 20px;
}

.a2-artifact {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 11px;
  padding: 11px 12px;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: rgba(255, 253, 249, 0.8);
}

.a2-artifact svg {
  width: 17px;
  height: 17px;
  color: var(--muted-ink);
  flex: none;
}

.a2-artifact div {
  display: grid;
  gap: 1px;
  min-width: 0;
}

.a2-artifact b {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  color: var(--foreground);
  overflow-wrap: anywhere;
}

.a2-artifact span {
  font-size: 11px;
  color: var(--dim-ink);
}

.a2-artifact .a2-ready {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--success);
  white-space: nowrap;
}

.a2-file {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}

.a2-file label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted-ink);
}

.a2-file label em {
  font-style: normal;
  color: var(--dim-ink);
  letter-spacing: 0.04em;
}

.a2-file input[type="file"] {
  width: 100%;
  min-width: 0;
  color: var(--dim-ink);
  font-size: 12px;
}

.a2-file input[type="file"]::file-selector-button {
  margin-right: 10px;
  padding: 8px 12px;
  border: 1px solid var(--rule-strong);
  border-radius: 7px;
  background: var(--surface-paper);
  color: var(--foreground);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.a2-field {
  display: grid;
  gap: 7px;
  margin: 18px 0 22px;
}

.a2-field label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted-ink);
}

.a2-fixed {
  display: flex;
  align-items: center;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: rgba(28, 25, 22, 0.03);
  font-size: 13px;
  color: var(--muted-ink);
}

.a2-field select {
  width: 100%;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--rule-strong);
  border-radius: 9px;
  background: var(--surface-paper);
  color: var(--foreground);
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
}

.a2-form .a2-btn {
  width: 100%;
}

.a2-hint {
  margin: 14px 0 0;
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--dim-ink);
}

/* Result panel */

.a2-result {
  display: flex;
  min-width: 0;
  flex-direction: column;
  min-height: 430px;
  padding: 26px;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(28, 25, 22, 0.035), transparent 55%),
    var(--surface-paper);
}

.a2-result-empty {
  display: flex;
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--dim-ink);
  padding: 30px 16px;
}

.a2-result-empty .a2-result-mark {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin-bottom: 18px;
  border: 1px solid var(--rule);
  border-radius: 50%;
  color: var(--dim-ink);
  background: var(--surface-paper);
}

.a2-result-empty .a2-result-mark svg {
  width: 22px;
  height: 22px;
}

.a2-result-empty b {
  font-size: 14px;
  font-weight: 600;
  color: var(--muted-ink);
}

.a2-result-empty p {
  max-width: 250px;
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
}

.a2-result-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule);
}

.a2-verdict {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.a2-verdict::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px color-mix(in srgb, currentColor 12%, transparent);
}

.a2-verdict.is-valid {
  color: var(--success);
}

.a2-verdict.is-invalid {
  color: var(--danger);
}

.a2-result-meta {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.7;
  color: var(--dim-ink);
  font-variant-numeric: tabular-nums;
}

.a2-identity {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted-ink);
}

.a2-identity .a2-i {
  width: 15px;
  height: 15px;
  flex: none;
  color: var(--success);
}

.a2-core {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 4px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: rgba(28, 25, 22, 0.025);
  min-width: 0;
}

.a2-core span {
  flex: none;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-core code {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--foreground);
}

.a2-copy {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--surface-paper);
  color: var(--muted-ink);
  cursor: pointer;
}

.a2-copy:hover {
  color: var(--foreground);
  border-color: var(--rule-strong);
}

.a2-copy svg {
  width: 13px;
  height: 13px;
}

.a2-steps {
  display: grid;
  margin-top: 10px;
}

.a2-step {
  display: grid;
  grid-template-columns: 15px minmax(0, 1fr) auto;
  align-items: start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(28, 25, 22, 0.055);
  font-size: 12px;
}

.a2-step:last-child {
  border-bottom: 0;
}

.a2-step-glyph {
  display: grid;
  place-items: center;
  width: 15px;
  height: 15px;
  margin-top: 1px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 700;
}

.a2-step.is-pass .a2-step-glyph {
  color: var(--success);
  background: rgba(47, 158, 107, 0.11);
}

.a2-step.is-fail .a2-step-glyph {
  color: var(--danger);
  background: rgba(179, 86, 63, 0.11);
}

.a2-step-body {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.a2-step-name {
  font-weight: 500;
  color: var(--foreground);
}

.a2-step-detail {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.5;
  color: var(--dim-ink);
  word-break: break-word;
}

.a2-step-state {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim-ink);
  padding-top: 2px;
}

.a2-step.is-pass .a2-step-state {
  color: var(--success);
}

.a2-step.is-fail .a2-step-state {
  color: var(--danger);
}

.a2-anchors {
  display: grid;
  gap: 6px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.a2-anchors-title {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim-ink);
}

.a2-anchor-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--muted-ink);
}

.a2-anchor-link:hover {
  color: var(--foreground);
  text-decoration: underline;
}

.a2-anchor-link span {
  color: var(--dim-ink);
}

.a2-anchor-go {
  width: 10px;
  height: 10px;
  opacity: 0.45;
}

.a2-result-note {
  margin-top: 14px;
  padding: 10px 12px;
  border-left: 2px solid var(--rule-strong);
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--muted-ink);
}

.a2-result-error {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  padding: 24px;
}

.a2-result-error b {
  font-size: 15px;
  font-weight: 600;
  color: var(--danger);
}

.a2-result-error p {
  margin: 8px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted-ink);
}

.a2-result-error span {
  margin-top: 14px;
  font-size: 11px;
  color: var(--dim-ink);
}

/* ----------------------------------------------------------- implementers */

.a2-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.a2-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: var(--surface-paper);
  transition: border-color 0.25s var(--ease-out), transform 0.25s var(--ease-out);
}

.a2-card:hover {
  border-color: var(--rule-strong);
  transform: translateY(-2px);
}

.a2-card .a2-i {
  width: 19px;
  height: 19px;
  color: var(--muted-ink);
  margin-bottom: 26px;
}

.a2-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.a2-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted-ink);
}

.a2-card code {
  display: block;
  margin-top: 16px;
  padding: 10px 11px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: rgba(28, 25, 22, 0.03);
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.55;
  color: var(--foreground);
  overflow-x: auto;
  white-space: pre;
}

.a2-card a {
  margin-top: auto;
  padding-top: 18px;
  font-size: 12px;
  font-weight: 600;
  color: var(--foreground);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.a2-card a svg {
  width: 13px;
  height: 13px;
}

.a2-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.a2-links a {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 14px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  font-size: 12px;
  color: var(--muted-ink);
  transition: color 0.2s, border-color 0.2s;
}

.a2-links a:hover {
  color: var(--foreground);
  border-color: var(--rule-strong);
}

/* ----------------------------------------------------------------- scope */

.a2-scope {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px;
}

.a2-scope h3 {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted-ink);
}

.a2-scope h3::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--success);
}

.a2-scope .a2-scope-no h3::before {
  background: var(--dim-ink);
}

.a2-scope ul {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.a2-scope li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted-ink);
}

.a2-scope li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 1px;
  background: var(--dim-ink);
}

.a2-scope-note {
  margin-top: 56px;
  padding: 20px 24px;
  border: 1px solid var(--rule);
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted-ink);
  background: rgba(255, 253, 249, 0.6);
}

.a2-scope-note b {
  color: var(--foreground);
  font-weight: 600;
}

/* ------------------------------------------------------------------ close */

.a2-close {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 72px 0 96px;
  border-top: 1px solid var(--rule);
}

.a2-close h2 {
  margin: 14px 0 0;
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 500;
  letter-spacing: -0.025em;
  word-spacing: 0.03em;
  line-height: 1.08;
}

.a2-close .a2-actions {
  flex: none;
}

/* -------------------------------------------------------------- responsive */

@media (max-width: 1000px) {
  .a2-hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 72px 0 80px;
  }

  .a2-hero h1 {
    max-width: 720px;
  }

  .a2-lead {
    max-width: 560px;
  }

  .a2-stage {
    min-height: 440px;
    margin-top: 8px;
    padding-right: 40px;
  }

  .a2-rail {
    right: 18px;
  }

  .a2-section {
    padding: 72px 0;
  }

  .a2-section-head {
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: start;
    margin-bottom: 40px;
  }

  .a2-levels {
    grid-template-columns: 1fr;
  }

  .a2-level + .a2-level {
    border-left: 0;
  }

  .a2-level p {
    min-height: 0;
  }

  .a2-level-top {
    margin-bottom: 22px;
  }

  .a2-verifier {
    grid-template-columns: 1fr;
  }

  .a2-form {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .a2-result {
    min-height: 340px;
  }

  .a2-cards {
    grid-template-columns: 1fr;
  }

  .a2-card {
    padding: 22px;
  }

  .a2-card .a2-i {
    margin-bottom: 18px;
  }

  .a2-scope {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .a2-close {
    align-items: flex-start;
    flex-direction: column;
    gap: 26px;
    padding: 56px 0 72px;
  }
}

@media (max-width: 620px) {
  .a2-main {
    padding: 0;
  }

  .a2-hero {
    padding: 52px 0 64px;
  }

  .a2-hero h1 {
    font-size: clamp(38px, 11vw, 54px);
  }

  .a2-lead {
    font-size: 16px;
  }

  .a2-actions .a2-btn {
    flex: 1;
    min-width: 0;
    padding: 0 16px;
  }

  .a2-meta {
    gap: 8px 16px;
    margin-top: 32px;
  }

  .a2-stage {
    min-height: 420px;
    justify-content: flex-start;
    padding-left: 2px;
  }

  .a2-receipt {
    width: min(100%, 320px);
    transform: none;
  }

  .a2-stage:hover .a2-receipt {
    transform: none;
  }

  .a2-rail {
    position: static;
    display: none;
  }

  .a2-section {
    padding: 56px 0;
  }

  .a2-section-head h2 {
    font-size: clamp(28px, 8.5vw, 38px);
  }

  .a2-level {
    padding: 24px 18px 28px;
  }

  .a2-form,
  .a2-result {
    padding: 20px 18px;
  }

  .a2-result-top {
    flex-direction: column;
  }

  .a2-result-meta {
    text-align: left;
  }

  .a2-step {
    grid-template-columns: 15px minmax(0, 1fr);
  }

  .a2-step-state {
    display: none;
  }

  .a2-close {
    padding: 48px 0 64px;
  }

  .a2-actions {
    width: 100%;
  }
}