#nav.nav-solid {
  background: rgba(8, 12, 20, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--line);
}
.nav-solid .nav-links {
  display: flex;
}

.page-body {
  padding-top: calc(72px + clamp(44px, 6vh, 76px));
  padding-bottom: clamp(60px, 8vh, 96px);
}
.page-meta {
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.sec-head.center .page-meta {
  text-align: center;
}

.doc {
  max-width: 700px;
  margin: 0 auto;
}
.doc section {
  display: block;
  min-height: 0;
  padding: 0;
  align-content: normal;
}
.doc-toc {
  margin-bottom: 52px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 92px;
}
.doc-toc-label {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 4px;
}
.doc-toc-label::before {
  content: '';
  width: 20px;
  height: 2px;
  border-radius: 2px;
  flex-shrink: 0;
  background: var(--btn-grad);
}
.t-dark .doc-toc-label::before {
  background: var(--brand-grad);
}
.doc-toc-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px 44px;
  margin-top: 30px;
}
a.doc-toc-label {
  color: var(--text);
  font-size: 11px;
  text-decoration: none;
  transition: color 0.2s;
}
a.doc-toc-label:hover {
  color: var(--action);
}
.doc-toc ul {
  list-style: none;
}
.doc-toc-single {
  columns: 2;
  column-gap: 44px;
}
.doc-toc-single li {
  break-inside: avoid;
}
.doc-toc-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  padding: 10px 2px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-2);
  text-decoration: none;
  transition:
    color 0.2s,
    border-color 0.25s;
}
.doc-toc-item .n {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--muted);
  transition: color 0.2s;
}
.doc-toc-item .t {
  flex: 1;
}
.doc-toc-item::after {
  content: '';
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  opacity: 0;
  background: var(--action);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M6 3l5 5-5 5' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M6 3l5 5-5 5' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / contain no-repeat;
  transition:
    opacity 0.25s ease,
    transform 0.25s var(--ease-out);
}
.doc-toc-item:hover {
  color: var(--text);
  border-bottom-color: var(--action-line);
}
.doc-toc-item:hover::after {
  opacity: 1;
  transform: translateX(3px);
}
.doc-toc-item:hover .n,
.doc-toc-item.active .n {
  color: var(--action);
}
.doc-toc-item.active {
  color: var(--action);
  border-bottom-color: var(--action-line);
}

.doc-part {
  scroll-margin-top: 92px;
  margin: 56px 0;
}
.part-banner {
  padding-top: 34px;
  border-top: 1px solid var(--line);
  margin-bottom: 38px;
}
.part-kicker {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 16px;
}
.part-kicker .sq {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  background: var(--accent);
}
.doc-body .part-banner h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.2vw, 34px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 14px;
}
.doc-body .part-banner h2 em {
  font-style: normal;
  color: var(--accent);
}
.doc-body .part-banner p {
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--text-2);
}
.part-rule {
  width: 80px;
  height: 3px;
  border-radius: 3px;
  margin-top: 26px;
  background: var(--btn-grad);
}
.t-dark .part-rule {
  background: var(--brand-grad);
}
.part-url {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-2);
  word-break: break-all;
}
.part-url svg {
  flex-shrink: 0;
  color: var(--accent);
}

.doc-sec {
  scroll-margin-top: 92px;
}
.doc-sec + .doc-sec {
  margin-top: 26px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.doc-h {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 12px;
}
.doc-h .n {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--accent);
}
.doc-sub {
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  margin: 20px 0 6px;
}
.doc-body p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-2);
}
.doc-body p + p {
  margin-top: 11px;
}
.doc-body strong {
  color: var(--text);
  font-weight: 600;
}
.doc-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--bg);
  color: var(--accent);
}
.doc-body p a,
.doc-body li a {
  color: var(--action);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.doc-body ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}
.doc-body li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--text-2);
}
.doc-body li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.58em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--accent);
}
.doc-body ul + p {
  margin-top: 13px;
}

.doc-note {
  display: flex;
  gap: 13px;
  margin: 16px 0;
  padding: 16px 18px;
  border: 1px solid var(--action-line);
  border-radius: 14px;
  background: var(--action-soft);
}
.doc-note svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--action);
}
.doc-note p {
  font-size: 14px;
  line-height: 1.68;
  color: var(--text);
}

.doc-table-wrap {
  margin: 16px 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  overflow-x: auto;
}
.doc-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
}
.doc-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.doc-table td {
  padding: 13px 16px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-2);
  vertical-align: top;
}
.doc-table tbody tr + tr td {
  border-top: 1px solid var(--line);
}
.doc-table td:first-child {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}

.faq-contact {
  display: flex;
  justify-content: center;
}

.form-shell {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  padding: 34px;
  overflow: hidden;
}
.form-shell::before {
  content: '';
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: var(--btn-grad);
}
.t-dark .form-shell::before {
  background: var(--brand-grad);
}
.contact-form {
  display: grid;
  gap: 17px;
  transition:
    opacity 0.3s var(--ease-out),
    transform 0.4s var(--ease-out),
    visibility 0.4s;
}
.field {
  display: grid;
  gap: 7px;
}
.field label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-2);
}
.field label .req {
  color: var(--accent);
}
.field input,
.field textarea {
  width: 100%;
  min-height: 50px;
  padding: 14px 16px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text);
  background: var(--card-2);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}
.field textarea {
  min-height: 138px;
  line-height: 1.7;
  resize: vertical;
}
.field input::placeholder,
.field textarea::placeholder {
  color: var(--muted);
}
.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--action);
  box-shadow: 0 0 0 3px var(--action-soft);
}
.field-error {
  display: none;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  color: var(--danger);
}
.field.has-error input,
.field.has-error textarea {
  border-color: var(--danger);
}
.field.has-error input:focus,
.field.has-error textarea:focus {
  box-shadow: 0 0 0 3px var(--danger-soft);
}
.field.has-error .field-error {
  display: flex;
}
.field-hp {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.form-alert {
  display: none;
  align-items: flex-start;
  gap: 11px;
  padding: 15px 17px;
  border: 1px solid var(--danger-line);
  border-radius: 12px;
  background: var(--danger-soft);
  font-size: 14px;
  line-height: 1.6;
  color: var(--danger);
}
.form-alert svg {
  flex-shrink: 0;
  margin-top: 2px;
}
.form-alert.is-on {
  display: flex;
}
.form-submit {
  width: 100%;
  border: none;
  margin-top: 3px;
}
.btn-spin {
  display: none;
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.32);
  border-top-color: var(--btn-ink);
}
.btn[aria-busy='true'] {
  pointer-events: none;
  filter: brightness(0.9);
}
.btn[aria-busy='true'] .btn-spin {
  display: block;
  animation: btnSpin 0.7s linear infinite;
}
.btn[aria-busy='true'] > svg {
  display: none;
}
@keyframes btnSpin {
  to {
    transform: rotate(360deg);
  }
}
.form-secure {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}
.form-secure svg {
  flex-shrink: 0;
  color: var(--accent);
}

.form-done {
  position: absolute;
  inset: 34px;
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity 0.45s var(--ease-out) 0.12s,
    transform 0.55s var(--ease-out) 0.12s,
    visibility 0.55s;
}
.form-shell.is-sent .form-done {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.form-shell.is-sent .contact-form {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  pointer-events: none;
}
.done-mark {
  position: relative;
  width: 74px;
  height: 74px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 24px;
}
.done-mark::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  border: 1px solid var(--accent-line);
  opacity: 0;
}
.done-mark path {
  stroke-dasharray: 32;
  stroke-dashoffset: 32;
}
.form-shell.is-sent .done-mark {
  animation: donePop 0.55s var(--ease-out) both;
}
.form-shell.is-sent .done-mark::after {
  animation: doneRing 1.1s var(--ease-out) 0.32s;
}
.form-shell.is-sent .done-mark path {
  animation: doneDraw 0.5s var(--ease-out) 0.3s forwards;
}
@keyframes donePop {
  0% {
    opacity: 0;
    transform: scale(0.7);
  }
  62% {
    transform: scale(1.06);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes doneRing {
  0% {
    opacity: 0.75;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.65);
  }
}
@keyframes doneDraw {
  to {
    stroke-dashoffset: 0;
  }
}
.form-done h2 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.form-done p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-2);
  max-width: 40ch;
}
.form-done .done-meta {
  margin-top: 26px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.done-again {
  margin-top: 22px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13.5px;
  color: var(--action);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-slim {
  min-height: 0;
}
.footer-slim .footer-base {
  padding: clamp(44px, 6vh, 68px) 4% clamp(28px, 4vh, 40px);
}
.footer-slim .footer-logo img {
  height: 68px;
}

@media (max-width: 900px) {
  .form-shell {
    padding: 28px 22px;
  }
  .form-done {
    inset: 28px 22px;
  }
}
@media (max-width: 780px) {
  .doc-toc-groups {
    grid-template-columns: minmax(0, 1fr);
  }
  .doc-toc-single {
    columns: 1;
  }
}
@media (max-width: 640px) {
  .nav-solid .nav-tagline {
    display: none;
  }
  .nav-solid .nav-links a {
    font-size: 12.5px;
    padding: 8px 9px;
  }
  .page-body {
    padding-top: calc(62px + clamp(36px, 5vh, 60px));
  }
  .doc-toc {
    padding: 18px 18px 20px;
  }
  .part-banner {
    padding: 22px 20px;
  }
}
@media (max-width: 480px) {
  .nav-solid .nav-lockup {
    display: none;
  }
}