:root {
  --deep-space-blue: #0B1D3A;
  --warm-paper: #F7F3E8;
  --star-gold: #F0B429;
  --galaxy-purple: #6B4FA0;
  --ice-blue: #A8D8EA;
  --ink: #1A1A2E;
  --soft-space-blue: #132A4F;
  --starlight-white: #F8FAFC;
  --dim-star-gold: #C9A66B;
  --signal-coral: #E25444;
  --font-display: "Space Grotesk", Impact, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", SFMono-Regular, Consolas, monospace;
  --container-max: 75rem;
  --container-pad: 1.25rem;
  --header-z: 100;
  --progress-z: 2000;
  --back-top-z: 1500;
  --ease-fast: 0.15s ease;
  --ease-med: 0.3s ease;
  --ease-slow: 0.6s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  background: var(--deep-space-blue);
  color: var(--warm-paper);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul,
ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

a {
  color: var(--ice-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--star-gold);
}

button {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--star-gold);
  outline-offset: 2px;
  border-radius: 2px;
}

::selection {
  background: var(--star-gold);
  color: var(--ink);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  font-weight: 700;
  color: var(--starlight-white);
  margin: 0 0 1rem;
}

h1 {
  font-size: clamp(3rem, 8vw, 6rem);
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
}

h3 {
  font-size: 1.375rem;
}

h4 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1rem;
}

[id] {
  scroll-margin-top: 1.5rem;
}

#main-content {
  display: block;
  outline: none;
}

.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.site-main {
  background: var(--warm-paper);
  color: var(--ink);
  min-height: 50vh;
}

.site-main a {
  color: var(--galaxy-purple);
  text-decoration: underline;
  text-decoration-color: rgba(107, 79, 160, 0.35);
  text-underline-offset: 0.25em;
}

.site-main a:hover {
  color: var(--deep-space-blue);
  text-decoration-color: var(--star-gold);
}

.section {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.section--dark {
  background: var(--deep-space-blue);
  color: var(--warm-paper);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--soft-space-blue);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--dim-star-gold);
  white-space: nowrap;
}

.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.1;
}

.section-head__rule {
  flex: 1;
  height: 3px;
  border: none;
  background: linear-gradient(90deg, var(--star-gold) 0%, var(--galaxy-purple) 60%, transparent 100%);
  opacity: 0.6;
}

.section--dark .section-head__title {
  color: var(--starlight-white);
}

.section--dark .section-head {
  border-bottom-color: var(--soft-space-blue);
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 3000;
  background: var(--star-gold);
  color: var(--ink);
  padding: 0.625rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  clip-path: polygon(0 4px, 4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: var(--progress-z);
  pointer-events: none;
  background: transparent;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--star-gold) 0%, var(--galaxy-purple) 50%, var(--ice-blue) 100%);
  transition: width 80ms linear;
}

.site-header {
  position: relative;
  background-color: var(--deep-space-blue);
  background-image:
    radial-gradient(1px 1px ellipse, rgba(168, 216, 234, 0.35) 0%, transparent 100%),
    radial-gradient(1px 1px ellipse, rgba(240, 180, 41, 0.25) 0%, transparent 100%);
  background-size: 140px 140px, 200px 200px;
  background-position: 20px 40px, 90px 120px;
  color: var(--warm-paper);
  border-bottom: 1px solid var(--soft-space-blue);
}

.site-header__meta {
  border-bottom: 1px solid var(--soft-space-blue);
  background: rgba(19, 42, 79, 0.35);
}

.site-header__meta-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 2.5rem;
}

.site-header__masthead {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim-star-gold);
  margin: 0;
}

.site-header__masthead-mark {
  color: var(--star-gold);
  font-size: 0.625rem;
}

.site-header__masthead-sep {
  color: var(--soft-space-blue);
}

.site-header__masthead-en {
  color: var(--ice-blue);
}

.site-header__quick {
  display: flex;
  gap: 0.5rem;
}

.site-header__quick-link {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--warm-paper);
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--soft-space-blue);
  transition: color 0.2s ease, border-color 0.2s ease;
  text-decoration: none;
}

.site-header__quick-link:hover {
  color: var(--star-gold);
  border-color: var(--star-gold);
}

.site-header__main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  padding-top: 2rem;
  padding-bottom: 1.5rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.875rem;
  text-decoration: none;
}

.site-brand__symbol {
  width: 2.75rem;
  height: 2.75rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.site-brand:hover .site-brand__symbol {
  transform: rotate(90deg);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.site-brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 4.5vw, 3.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--starlight-white);
}

.site-brand__sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--dim-star-gold);
}

.site-brand__index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--dim-star-gold);
  border: 1px solid var(--soft-space-blue);
  padding: 0.125rem 0.375rem;
  text-transform: uppercase;
  white-space: nowrap;
}

.site-header__tagline {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ice-blue);
  letter-spacing: 0.04em;
  border-left: 1px solid var(--galaxy-purple);
  padding-left: 1rem;
  margin: 0;
}

.site-nav {
  border-top: 1px solid var(--soft-space-blue);
  background: rgba(8, 21, 40, 0.5);
}

.site-nav__toggle {
  display: none;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.125rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.625rem 1.125rem;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--warm-paper);
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

.site-nav__link:hover {
  color: var(--star-gold);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--dim-star-gold);
  letter-spacing: 0.08em;
}

.site-nav__label {
  display: inline-block;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 1.125rem;
  right: 1.125rem;
  bottom: 0.125rem;
  height: 2px;
  background: linear-gradient(90deg, var(--star-gold), var(--ice-blue));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.site-nav__link:hover::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1) skewX(-30deg);
}

.site-nav__link[aria-current="page"] {
  color: var(--star-gold);
}

.site-footer {
  background-color: var(--deep-space-blue);
  background-image:
    radial-gradient(1px 1px ellipse, rgba(168, 216, 234, 0.22) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px ellipse, rgba(107, 79, 160, 0.25) 0%, transparent 100%);
  background-size: 160px 160px, 220px 220px;
  background-position: 20px 30px, 120px 100px;
  color: var(--warm-paper);
  position: relative;
}

.site-footer__trajectory {
  height: 2.5rem;
  overflow: hidden;
}

.site-footer__trajectory-svg {
  width: 100%;
  height: 100%;
}

.site-footer__main {
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1.2fr 1fr;
  gap: 2.5rem;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 0.875rem;
}

.site-footer__brand-mark {
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
}

.site-footer__brand-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--starlight-white);
  letter-spacing: 0.04em;
}

.site-footer__brand-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--dim-star-gold);
  border: 1px solid var(--soft-space-blue);
  padding: 0.125rem 0.375rem;
  margin-left: 0.25rem;
  text-transform: uppercase;
}

.site-footer__about {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--dim-star-gold);
  max-width: 26rem;
}

.site-footer__trust {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--ice-blue);
  border-left: 2px solid var(--star-gold);
  padding-left: 0.75rem;
  margin-top: 1rem;
  max-width: 26rem;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ice-blue);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--soft-space-blue);
}

.site-footer__contact-list li {
  margin-bottom: 0.5rem;
  display: flex;
  gap: 0.75rem;
  font-size: 0.875rem;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--dim-star-gold);
  white-space: nowrap;
  padding-top: 0.125rem;
  min-width: 2.5rem;
}

.site-footer__contact-value {
  color: var(--warm-paper);
  line-height: 1.6;
}

.site-footer__legal-list li {
  margin-bottom: 0.5rem;
}

.site-footer__legal-list a {
  color: var(--ice-blue);
  font-size: 0.875rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  transition: color 0.2s ease;
}

.site-footer__legal-list a::before {
  content: "→";
  color: var(--star-gold);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.site-footer__legal-list a:hover {
  color: var(--star-gold);
}

.site-footer__note {
  font-size: 0.75rem;
  color: var(--dim-star-gold);
  margin-top: 1rem;
  line-height: 1.6;
}

.site-footer__bottom {
  border-top: 1px solid var(--soft-space-blue);
  background: rgba(8, 21, 40, 0.5);
  padding-top: 0.875rem;
  padding-bottom: 0.875rem;
}

.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-footer__icp,
.site-footer__copyright {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--dim-star-gold);
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 6px, 6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: var(--star-gold);
  color: var(--ink);
  border-color: var(--star-gold);
}

.btn--primary:hover {
  background: var(--galaxy-purple);
  border-color: var(--galaxy-purple);
  color: var(--starlight-white);
}

.btn--ghost {
  background: transparent;
  color: var(--warm-paper);
  border-color: var(--warm-paper);
}

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

.btn--compact {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

.chamfer-card {
  background: var(--warm-paper);
  color: var(--ink);
  padding: 2rem;
  clip-path: polygon(0 1rem, 1rem 0, 100% 0, 100% calc(100% - 1rem), calc(100% - 1rem) 100%, 0 100%);
  border: 1px solid var(--soft-space-blue);
}

.chamfer-card h1,
.chamfer-card h2,
.chamfer-card h3,
.chamfer-card h4 {
  color: var(--ink);
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--galaxy-purple);
  background: var(--warm-paper);
  border: 1px solid var(--galaxy-purple);
  border-radius: 2px;
  white-space: nowrap;
}

.tag-chip--gold {
  color: var(--star-gold);
  border-color: var(--star-gold);
  background: var(--deep-space-blue);
}

.tag-chip--ice {
  color: var(--ice-blue);
  border-color: var(--ice-blue);
  background: var(--deep-space-blue);
}

.index-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--dim-star-gold);
  border-left: 3px solid var(--star-gold);
  padding-left: 0.625rem;
  text-transform: uppercase;
}

.trajectory-line {
  position: relative;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--star-gold) 50%, var(--ice-blue) 100%);
  border: none;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: var(--back-top-z);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--star-gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  border: none;
  clip-path: polygon(0 4px, 4px 0, 100% 0, 100% calc(100% - 4px), calc(100% - 4px) 100%, 0 100%);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--galaxy-purple);
  color: var(--starlight-white);
}

.back-to-top__icon {
  display: inline-block;
  width: 0.625em;
  height: 0.625em;
  flex-shrink: 0;
}

.back-to-top__icon::before {
  content: "";
  display: block;
  width: 0.625em;
  height: 0.625em;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(-45deg);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--dim-star-gold);
  margin: 0 0 1.5rem;
  padding: 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.breadcrumb__item a {
  color: var(--galaxy-purple);
  text-decoration: none;
}

.breadcrumb__item a:hover {
  color: var(--star-gold);
}

.breadcrumb__separator {
  color: var(--soft-space-blue);
}

.accordion {
  border: 1px solid var(--soft-space-blue);
  background: var(--warm-paper);
  margin: 1.5rem 0;
}

.accordion__item {
  border-bottom: 1px dashed rgba(19, 42, 79, 0.25);
}

.accordion__item:last-child {
  border-bottom: none;
}

.accordion__trigger {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s ease;
}

.accordion__trigger:hover {
  background: rgba(107, 79, 160, 0.06);
}

.accordion__trigger[aria-expanded="true"] {
  background: rgba(240, 180, 41, 0.05);
}

.accordion__index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--galaxy-purple);
  min-width: 3.5rem;
}

.accordion__title {
  flex: 1;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

.accordion__indicator {
  position: relative;
  width: 0.875rem;
  height: 0.875rem;
  flex-shrink: 0;
  margin-left: 1rem;
}

.accordion__indicator::before,
.accordion__indicator::after {
  content: "";
  position: absolute;
  background: var(--star-gold);
  transition: transform 0.3s ease;
}

.accordion__indicator::before {
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
}

.accordion__indicator::after {
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  transform: translateY(-50%);
}

.accordion__trigger[aria-expanded="true"] .accordion__indicator::before {
  transform: translateX(-50%) scaleY(0);
}

.accordion__panel[hidden] {
  display: none;
}

.accordion__panel {
  margin: 0 1rem 1.25rem 3.5rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--galaxy-purple);
  background: linear-gradient(90deg, rgba(107, 79, 160, 0.05), transparent);
}

.accordion__content {
  font-size: 0.9375rem;
  color: var(--ink);
}

.accordion__content p:last-child {
  margin-bottom: 0;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--soft-space-blue);
  aspect-ratio: 16 / 9;
}

.image-frame--ratio-4-3 {
  aspect-ratio: 4 / 3;
}

.image-frame--ratio-1-1 {
  aspect-ratio: 1 / 1;
}

.image-frame--ratio-21-9 {
  aspect-ratio: 21 / 9;
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px ellipse, rgba(168, 216, 234, 0.35) 0%, transparent 50%),
    radial-gradient(1px 1px ellipse, rgba(240, 180, 41, 0.25) 0%, transparent 50%);
  background-size: 100px 100px, 150px 150px;
  background-position: 10px 20px, 60px 90px;
  z-index: 1;
}

.image-frame::after {
  content: "IMG·PH";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--dim-star-gold);
  border: 1px dashed var(--galaxy-purple);
  margin: 1rem;
  z-index: 2;
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 3;
}

.star-field {
  position: relative;
  overflow: hidden;
}

.star-field::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px ellipse, rgba(168, 216, 234, 0.3) 0%, transparent 50%),
    radial-gradient(1px 1px ellipse, rgba(240, 180, 41, 0.25) 0%, transparent 50%),
    radial-gradient(2px 2px ellipse, rgba(107, 79, 160, 0.2) 0%, transparent 50%);
  background-size: 180px 180px, 240px 240px, 220px 220px;
  background-position: 20px 40px, 100px 160px, 60px 240px;
  pointer-events: none;
  z-index: 0;
}

.star-field > * {
  position: relative;
  z-index: 1;
}

@media (min-width: 48.0625rem) {
  .site-nav__toggle {
    display: none !important;
  }
}

@media (max-width: 64rem) {
  .site-header__tagline {
    display: none;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__col:first-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 48rem) {
  .container {
    --container-pad: 1rem;
  }

  .site-header__meta-inner {
    justify-content: center;
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
  }

  .site-header__quick {
    display: none;
  }

  .site-header__masthead-sep,
  .site-header__masthead-en {
    display: inline;
  }

  .site-header__main {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
    padding-top: 1.5rem;
    padding-bottom: 1rem;
  }

  .site-header__tagline {
    display: block;
    border-left: none;
    border-top: 1px dashed var(--soft-space-blue);
    padding-left: 0;
    padding-top: 0.5rem;
    text-align: center;
  }

  .site-brand {
    flex-direction: column;
    gap: 0.5rem;
  }

  .site-brand__index {
    display: none;
  }

  .site-brand__symbol {
    width: 2.25rem;
    height: 2.25rem;
  }

  .site-nav {
    padding-bottom: 0.5rem;
  }

  .site-nav__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--soft-space-blue);
    background: var(--soft-space-blue);
    color: var(--warm-paper);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: border-color 0.2s ease;
  }

  .site-nav__toggle:hover {
    border-color: var(--star-gold);
  }

  .site-nav__toggle-bar {
    display: inline-block;
    width: 1rem;
    height: 2px;
    background: var(--star-gold);
    position: relative;
    transition: background 0.2s ease;
  }

  .site-nav__toggle-bar::before,
  .site-nav__toggle-bar::after {
    content: "";
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--star-gold);
    transition: transform 0.2s ease, top 0.2s ease, bottom 0.2s ease;
  }

  .site-nav__toggle-bar::before {
    top: -6px;
  }

  .site-nav__toggle-bar::after {
    bottom: -6px;
  }

  .site-nav[data-open] .site-nav__toggle-bar {
    background: transparent;
  }

  .site-nav[data-open] .site-nav__toggle-bar::before {
    top: 0;
    transform: rotate(45deg);
  }

  .site-nav[data-open] .site-nav__toggle-bar::after {
    bottom: 0;
    transform: rotate(-45deg);
  }

  .site-nav__list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
  }

  .site-nav[data-open] .site-nav__list {
    display: flex;
  }

  .site-nav__item {
    border-bottom: 1px solid var(--soft-space-blue);
  }

  .site-nav__item:last-child {
    border-bottom: none;
  }

  .site-nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0.875rem 1rem;
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link[aria-current="page"] {
    background: var(--soft-space-blue);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .site-footer__col:first-child {
    grid-column: auto;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    text-align: center;
    gap: 0.375rem;
  }

  .section {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

@media (max-width: 30rem) {
  .site-header__masthead-en {
    display: none;
  }

  .site-footer__contact-list li {
    flex-direction: column;
    gap: 0.125rem;
  }

  .site-footer__contact-label {
    min-width: 0;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .scroll-progress__bar {
    transition: none;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}