/* ============================================
   Site Kit — /assets/site.css
   B体育官网中文版 · 体坛前线
   ============================================ */

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

button,
[role="button"] {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

/* ---------- Variables ---------- */
:root {
  --color-bg: #0A1128;
  --color-bg-elev: #16213E;
  --color-bg-elev-2: #1D2B4D;
  --color-accent: #00FF94;
  --color-accent-deep: #00C271;
  --color-warn: #FF4D00;
  --color-warn-soft: #FF7A3D;
  --color-panel: #F4F6FA;
  --color-text: #E6EAF2;
  --color-text-dim: #A0AEC0;

  --font-headline: "Alibaba PuHuiTi", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "Consolas", monospace;

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-pill: 999px;

  --container-max: 1200px;
  --container-pad: 1.25rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

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

a {
  color: var(--color-accent-deep);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

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

p + p {
  margin-top: 0.75rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

h1 { font-size: clamp(2rem, 4.5vw, 3.125rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.0625rem; }
h5,
h6 { font-size: 0.9375rem; }

#main-content {
  scroll-margin-top: 1rem;
}

#main-content:focus {
  outline: none;
}

/* ---------- Focus & reduced motion ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.panel--light :focus-visible,
.stack-panel--light :focus-visible {
  outline-color: var(--color-bg);
  box-shadow: 0 0 0 4px rgba(0, 255, 148, 0.35);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
}

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 3000;
  transform: translateY(-300%);
  padding: 0.625rem 1.375rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 0.875rem;
  box-shadow: 0 4px 20px rgba(0, 255, 148, 0.35);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 2000;
  background: linear-gradient(90deg, var(--color-accent), var(--color-warn));
  border-radius: 0 2px 2px 0;
  box-shadow: 0 0 10px rgba(0, 255, 148, 0.4);
  pointer-events: none;
}

/* ---------- Container ---------- */
.site-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ---------- Stack panel ---------- */
.stack-panel {
  position: relative;
  width: 100%;
  padding: 3rem 0;
}

.stack-panel--alt {
  background: var(--color-bg-elev);
}

.stack-panel--light {
  background: var(--color-panel);
  color: var(--color-bg);
}

.stack-panel--light h1,
.stack-panel--light h2,
.stack-panel--light h3,
.stack-panel--light h4 {
  color: var(--color-bg);
}

.stack-panel--light a {
  color: var(--color-accent-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.stack-panel--light a:hover {
  color: var(--color-bg);
}

.stack-panel::after {
  content: attr(data-index);
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  letter-spacing: 0.14em;
  color: var(--color-warn-soft);
  opacity: 0.6;
}

/* ---------- Typography utilities ---------- */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-warn-soft);
}

.mono-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: rgba(0, 255, 148, 0.1);
  border-radius: var(--radius-pill);
  padding: 0.125rem 0.625rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.375rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  border: 1px solid transparent;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

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

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

.btn--ghost {
  background: transparent;
  border-color: rgba(0, 255, 148, 0.45);
  color: var(--color-accent);
}

.btn--ghost:hover {
  background: rgba(0, 255, 148, 0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--warn {
  background: var(--color-warn);
  color: var(--color-panel);
}

.btn--warn:hover {
  background: var(--color-warn-soft);
  color: var(--color-bg);
}

.panel--light .btn--ghost,
.stack-panel--light .btn--ghost {
  border-color: rgba(10, 17, 40, 0.3);
  color: var(--color-bg);
}

.panel--light .btn--ghost:hover,
.stack-panel--light .btn--ghost:hover {
  background: rgba(10, 17, 40, 0.06);
  border-color: var(--color-bg);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumbs__item::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--color-warn-soft);
  margin-right: 0.25rem;
}

.breadcrumbs__item:first-child::before {
  content: none;
}

.breadcrumbs__link {
  color: var(--color-text-dim);
}

.breadcrumbs__link:hover {
  color: var(--color-accent);
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--color-text);
  font-weight: 600;
}

.panel--light .breadcrumbs__item[aria-current="page"],
.stack-panel--light .breadcrumbs__item[aria-current="page"] {
  color: var(--color-bg);
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .grid--2 {
    gap: 1.75rem;
  }
  .grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .grid--asym {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  }
}

/* ---------- Panel ---------- */
.panel {
  position: relative;
  padding: 2rem 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--color-bg-elev);
  overflow: hidden;
}

.panel::after {
  content: attr(data-index);
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  letter-spacing: 0.14em;
  color: var(--color-warn-soft);
  opacity: 0.85;
}

.panel--light {
  background: var(--color-panel);
  color: var(--color-bg);
}

.panel--light h1,
.panel--light h2,
.panel--light h3,
.panel--light h4 {
  color: var(--color-bg);
}

.panel--light a {
  color: var(--color-accent-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.panel--light a:hover {
  color: var(--color-bg);
}

.panel--flat {
  background: transparent;
}

.panel--light .section-label,
.stack-panel--light .section-label {
  color: var(--color-warn);
}

/* ---------- Step path ---------- */
.step-path {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.step-path__item {
  position: relative;
  padding-left: 3rem;
  min-height: 2.5rem;
}

.step-path__item::before {
  content: attr(data-step);
  position: absolute;
  left: 0;
  top: 0.125rem;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-path__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 1.0625rem;
  top: 2.625rem;
  width: 2px;
  height: calc(100% + 0.75rem);
  background: linear-gradient(180deg, var(--color-accent) 0%, rgba(0, 255, 148, 0) 100%);
}

/* ---------- Data row ---------- */
.data-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed rgba(160, 174, 192, 0.2);
}

.data-row:last-child {
  border-bottom: none;
}

.data-row__label {
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

.data-row__value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

.panel--light .data-row__label,
.stack-panel--light .data-row__label {
  color: rgba(10, 17, 40, 0.55);
}

.panel--light .data-row__value,
.stack-panel--light .data-row__value {
  color: var(--color-bg);
}

/* ---------- Collapsible ---------- */
.collapsible {
  border-radius: var(--radius-md);
  background: var(--color-bg-elev);
  border: 1px solid rgba(0, 255, 148, 0.08);
  overflow: hidden;
}

.collapsible + .collapsible {
  margin-top: 0.75rem;
}

.collapsible summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text);
  list-style: none;
  transition: background 0.2s ease;
}

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

.collapsible summary:hover {
  background: var(--color-bg-elev-2);
}

.collapsible summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--color-accent);
  border: 1px solid rgba(0, 255, 148, 0.4);
  border-radius: 50%;
  width: 1.5rem;
  height: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.collapsible[open] summary::after {
  content: "–";
}

.collapsible__panel {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.collapsible__panel > :last-child {
  margin-bottom: 0;
}

.panel--light .collapsible,
.stack-panel--light .collapsible {
  background: #ffffff;
  border-color: rgba(10, 17, 40, 0.08);
}

.panel--light .collapsible summary,
.stack-panel--light .collapsible summary {
  color: var(--color-bg);
}

.panel--light .collapsible summary:hover,
.stack-panel--light .collapsible summary:hover {
  background: rgba(10, 17, 40, 0.04);
}

.panel--light .collapsible__panel,
.stack-panel--light .collapsible__panel {
  color: rgba(10, 17, 40, 0.75);
}

/* ---------- Chip ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-pill);
  background: var(--color-bg-elev);
  border: 1px solid rgba(0, 255, 148, 0.2);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-dim);
  cursor: pointer;
  font-family: var(--font-body);
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.chip:hover {
  background: rgba(0, 255, 148, 0.08);
  border-color: rgba(0, 255, 148, 0.4);
  color: var(--color-accent);
}

.chip[aria-pressed="true"] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
}

.panel--light .chip,
.stack-panel--light .chip {
  background: #ffffff;
  border-color: rgba(10, 17, 40, 0.15);
  color: rgba(10, 17, 40, 0.7);
}

.panel--light .chip:hover,
.stack-panel--light .chip:hover {
  border-color: var(--color-accent-deep);
  color: var(--color-accent-deep);
}

.panel--light .chip[aria-pressed="true"],
.stack-panel--light .chip[aria-pressed="true"] {
  background: var(--color-bg);
  border-color: var(--color-bg);
  color: var(--color-accent);
}

/* ---------- Figure ---------- */
.figure {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    repeating-linear-gradient(45deg, transparent 0 10px, rgba(160, 174, 192, 0.06) 10px 20px),
    var(--color-bg-elev);
}

.figure--tall {
  aspect-ratio: 3 / 4;
}

.figure--wide {
  aspect-ratio: 21 / 9;
}

.figure img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure::after {
  content: "IMG";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.3em;
  color: rgba(160, 174, 192, 0.45);
  border: 1px dashed rgba(160, 174, 192, 0.25);
  border-radius: var(--radius-lg);
}

/* ---------- Header ---------- */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid rgba(0, 255, 148, 0.15);
  position: relative;
  z-index: 100;
}

.site-header__upper {
  position: relative;
  padding: 2rem 0;
  overflow: hidden;
}

.site-header__upper::before {
  content: "";
  position: absolute;
  right: -5%;
  top: -60%;
  width: 50%;
  height: 250%;
  background: linear-gradient(135deg, transparent 0%, transparent 45%, rgba(0, 255, 148, 0.08) 100%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.site-header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  position: relative;
  z-index: 1;
}

.site-header__inner--upper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-header__brand {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  min-width: 0;
  color: var(--color-text);
  text-decoration: none;
}

.site-header__brand:hover {
  color: var(--color-text);
}

.site-header__brand-index {
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  line-height: 1.2;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  background: rgba(0, 255, 148, 0.1);
  border: 1px solid rgba(0, 255, 148, 0.25);
  border-radius: var(--radius-pill);
  padding: 0.125rem 0.625rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.site-header__brand-name {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--color-text);
  white-space: nowrap;
}

.site-header__claim {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
  border-left: 2px solid var(--color-warn);
  padding: 0.25rem 0 0.25rem 0.875rem;
}

.site-header__toggle {
  display: none;
}

.site-header__lower {
  background:
    linear-gradient(115deg, rgba(0, 255, 148, 0.05) 0%, transparent 240px),
    var(--color-bg-elev);
  border-top: 1px solid rgba(0, 255, 148, 0.12);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  position: relative;
}

.site-header__lower::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 10rem;
  height: 1px;
  background: var(--color-accent);
  box-shadow: 0 0 12px rgba(0, 255, 148, 0.5);
}

.site-header__inner--nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding-top: 0.625rem;
  padding-bottom: 0.625rem;
}

.site-header__nav-label {
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-warn-soft);
  white-space: nowrap;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.site-nav__link {
  display: inline-block;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-pill);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.site-nav__link:hover {
  background: rgba(0, 255, 148, 0.12);
  color: var(--color-accent);
}

.site-nav__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-nav__link[aria-current="page"] {
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
}

.site-nav__link[aria-current="page"]:hover {
  background: var(--color-accent-deep);
  color: var(--color-bg);
}

.site-header__toggle-text {
  font-size: 0.8125rem;
  font-weight: 700;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 3rem;
  background:
    linear-gradient(115deg, transparent 55%, rgba(255, 77, 0, 0.04) 100%),
    var(--color-bg);
  color: var(--color-text-dim);
  border-top: 1px solid rgba(0, 255, 148, 0.15);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 55%, var(--color-warn) 100%);
  border-radius: 0 0 2px 2px;
}

.site-footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 3rem var(--container-pad) 2rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px dashed rgba(160, 174, 192, 0.2);
}

.site-footer__brand-block {
  min-width: 0;
}

.site-footer__brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.site-footer__brand-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
}

.site-footer__about {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-warn-soft);
  margin-bottom: 0.625rem;
}

.site-footer__nav,
.site-footer__legal {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-footer__nav-link,
.site-footer__legal-link {
  color: var(--color-text-dim);
  font-size: 0.875rem;
  padding-left: 0;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__nav-link:hover,
.site-footer__legal-link:hover {
  color: var(--color-accent);
  padding-left: 0.25rem;
}

.site-footer__legal-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.site-footer__legal-link::before {
  content: "";
  width: 0.375rem;
  height: 0.375rem;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.65;
  flex-shrink: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.site-footer__legal-link:hover::before {
  opacity: 1;
  transform: scale(1.25);
}

.site-footer__meta {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  padding-top: 1.5rem;
  font-size: 0.8125rem;
}

.site-footer__trust {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-dim);
  max-width: 56ch;
}

.site-footer__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  color: var(--color-text-dim);
}

.site-footer__contact-item {
  overflow-wrap: anywhere;
}

.site-footer__contact-sep {
  opacity: 0.4;
}

.site-footer__meta-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.375rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  color: var(--color-text-dim);
}

.site-footer__icp::before {
  content: "// ";
  color: var(--color-accent);
}

.site-footer__copy {
  white-space: nowrap;
}

/* ---------- Responsive ---------- */
@media (min-width: 768px) {
  :root {
    --container-pad: 2rem;
  }

  .stack-panel {
    padding: 4.5rem 0;
  }

  .panel {
    padding: 2.5rem 1.5rem;
  }

  .site-footer__grid {
    grid-template-columns: 1.1fr 1fr 0.9fr;
    gap: 3rem;
  }
}

@media (max-width: 960px) {
  .site-header__claim {
    display: none;
  }
}

@media (max-width: 720px) {
  .site-header__upper {
    padding: 1rem 0;
  }

  .site-header__inner--upper {
    gap: 1rem;
  }

  .site-header__brand-name {
    font-size: 1.0625rem;
    white-space: normal;
    line-height: 1.3;
  }

  .site-header__toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 0.875rem;
    border-radius: var(--radius-pill);
    background: rgba(0, 255, 148, 0.12);
    border: 1px solid rgba(0, 255, 148, 0.3);
    color: var(--color-accent);
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: background 0.2s ease;
  }

  .site-header__toggle:hover {
    background: rgba(0, 255, 148, 0.2);
  }

  .site-header__toggle-icon {
    position: relative;
    display: inline-block;
    width: 14px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
  }

  .site-header__toggle-icon::before,
  .site-header__toggle-icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
    transition: transform 0.2s ease, top 0.2s ease;
  }

  .site-header__toggle-icon::before {
    top: -5px;
  }

  .site-header__toggle-icon::after {
    top: 5px;
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-icon {
    background: transparent;
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-icon::after {
    top: 0;
    transform: rotate(-45deg);
  }

  .site-header__lower {
    display: none;
  }

  .site-header__lower[data-open="true"] {
    display: block;
  }

  .site-header__inner--nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0.875rem;
    padding-top: 1rem;
    padding-bottom: 1.25rem;
  }

  .site-nav {
    flex-direction: column;
    gap: 0.25rem;
  }

  .site-nav__link {
    border-radius: var(--radius-md);
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
  }
}

@media (max-width: 640px) {
  .site-footer__contact {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.125rem;
  }

  .site-footer__contact-sep {
    display: none;
  }

  .site-footer__meta-line {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  :root {
    --container-pad: 1rem;
  }

  .site-header__brand-index {
    display: none;
  }
}