/* ==========================================================================
   HTH — 全站共享样式 /assets/site.css
   ========================================================================== */

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-main);
  background-color: var(--color-bg-deep);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  cursor: pointer;
  background: none;
  border: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  line-height: 1.15;
  font-weight: 700;
  color: var(--color-text-main);
}

p {
  overflow-wrap: break-word;
}

::selection {
  background: rgba(255, 122, 0, 0.45);
  color: #fff;
}

/* ---------- Variables ---------- */
:root {
  --color-bg-deep: #0A0F1E;
  --color-bg-panel: #111B2D;
  --color-bg-elevated: #17203A;
  --color-accent-orange: #FF7A00;
  --color-accent-lime: #A3FF12;
  --color-text-main: #EAF0F8;
  --color-text-sub: #8A9BB5;
  --color-link: #4DD0E1;
  --color-border: rgba(77, 208, 225, 0.22);
  --color-border-light: rgba(77, 208, 225, 0.12);
  --gradient-accent: linear-gradient(135deg, rgba(255, 122, 0, 0.15), rgba(163, 255, 18, 0.08));
  --gradient-cta: linear-gradient(135deg, #FF7A00, #FF9838);
  --gradient-progress: linear-gradient(90deg, var(--color-accent-orange), var(--color-accent-lime));

  --font-heading: 'Space Grotesk', 'Arial Black', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Helvetica Neue', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'SF Mono', 'Fira Code', Consolas, 'Liberation Mono', monospace;
  --font-editorial: Georgia, 'Songti SC', 'SimSun', serif;

  --container-max: 1320px;
  --container-pad: clamp(16px, 4vw, 48px);

  --transition-fast: 0.2s ease-out;
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  --radius-card: 2px;

  --header-top-height: 64px;
  --header-bottom-height: 56px;
}

/* ---------- Focus-visible ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent-lime);
  outline-offset: 3px;
}

/* ---------- Visually Hidden ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- Page Shell ---------- */
.page-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-shell > .site-footer {
  margin-top: auto;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.container--narrow {
  max-width: 900px;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: -200%;
  z-index: 9999;
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: var(--color-accent-lime);
  color: var(--color-bg-deep);
  font-weight: 700;
  font-size: 0.875rem;
  clip-path: polygon(8px 0, calc(100% - 8px) 0, 100% 8px, 100% calc(100% - 8px), calc(100% - 8px) 100%, 8px 100%, 0 calc(100% - 8px), 0 8px);
  transition: left var(--transition-fast);
}

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

.skip-link:focus-visible {
  outline: 2px solid var(--color-bg-deep);
  outline-offset: -2px;
  box-shadow: 0 0 0 3px var(--color-accent-lime);
}

/* ---------- Scroll Progress ---------- */
.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1001;
  background: var(--gradient-progress);
  transform: scaleX(0);
  transform-origin: 0 0;
  pointer-events: none;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border-light);
}

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

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-top-height);
  border-bottom: 1px solid var(--color-border-light);
}

.header-masthead {
  display: flex;
  align-items: center;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-main);
  transition: opacity var(--transition-fast);
}

.brand:hover {
  color: var(--color-text-main);
  opacity: 0.88;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--color-bg-deep);
  background: var(--gradient-cta);
  clip-path: polygon(10px 0, calc(100% - 4px) 0, 100% 10px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 4px 100%, 0 calc(100% - 4px), 0 4px);
}

.brand__text {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  min-width: 0;
}

.brand__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  color: var(--color-text-main);
  white-space: nowrap;
}

.brand__divider {
  color: var(--color-accent-orange);
  font-size: 0.875rem;
}

.brand__tagline {
  font-size: 0.8125rem;
  color: var(--color-text-sub);
  white-space: nowrap;
}

.header-utilities {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.live-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-sub);
  border: 1px solid var(--color-border);
  clip-path: polygon(6px 0, calc(100% - 6px) 0, 100% 6px, 100% calc(100% - 6px), calc(100% - 6px) 100%, 6px 100%, 0 calc(100% - 6px), 0 6px);
}

.live-status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-lime);
  box-shadow: 0 0 8px rgba(163, 255, 18, 0.7);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% {
    box-shadow: 0 0 4px rgba(163, 255, 18, 0.4);
    opacity: 0.8;
  }
  50% {
    box-shadow: 0 0 14px rgba(163, 255, 18, 0.95);
    opacity: 1;
  }
}

.v3-entry {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.6rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.v3-entry:hover {
  border-color: var(--color-accent-orange);
  color: var(--color-accent-orange);
  background: rgba(255, 122, 0, 0.06);
}

.v3-entry__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 20px;
  padding: 0 4px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-bg-deep);
  background: var(--color-accent-lime);
  clip-path: polygon(4px 0, calc(100% - 4px) 0, 100% 4px, 100% calc(100% - 4px), calc(100% - 4px) 100%, 4px 100%, 0 calc(100% - 4px), 0 4px);
}

.v3-entry__arrow {
  font-size: 0.875rem;
  color: var(--color-accent-orange);
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent-lime);
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-main);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Site Nav ---------- */
.site-header__bottom {
  position: relative;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
  padding: 0;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: var(--header-bottom-height);
  padding: 0.5rem 1.1rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.03em;
  color: var(--color-text-main);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-accent-lime);
  background: rgba(163, 255, 18, 0.04);
}

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

.site-nav__link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--gradient-progress);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--color-bg-panel);
  border-top: 1px solid var(--color-border-light);
  margin-top: var(--space-20, 5rem);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-progress);
  clip-path: polygon(0 0, 100% 0, calc(100% - 60px) 100%, 0 100%);
}

.site-footer .container {
  padding-top: 3rem;
  padding-bottom: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 0.8fr 1.2fr;
  gap: 2.5rem;
}

.footer-brand {
  min-width: 0;
}

.footer-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 0.75rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8125rem;
  color: var(--color-bg-deep);
  background: var(--gradient-cta);
  clip-path: polygon(12px 0, calc(100% - 4px) 0, 100% 12px, 100% calc(100% - 12px), calc(100% - 12px) 100%, 4px 100%, 0 calc(100% - 4px), 0 4px);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text-main);
  margin-bottom: 0.25rem;
}

.footer-brand__sub {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  margin-bottom: 1rem;
}

.footer-brand__trust {
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--color-text-sub);
  max-width: 340px;
  padding-left: 0.75rem;
  border-left: 2px solid var(--color-accent-orange);
}

.footer-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.45rem;
}

.footer-col__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-orange);
  margin-bottom: 0.35rem;
}

.footer-col__link {
  display: inline-flex;
  align-items: center;
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-col__link::before {
  content: '/';
  margin-right: 0.35rem;
  font-family: var(--font-mono);
  color: var(--color-accent-lime);
  font-size: 0.75rem;
  opacity: 0.7;
}

.footer-col__link:hover {
  color: var(--color-accent-lime);
  transform: translateX(3px);
}

.footer-contact {
  gap: 0.35rem;
}

.footer-contact__item {
  font-size: 0.875rem;
  color: var(--color-text-sub);
  line-height: 1.5;
}

.footer-contact__note {
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-sub);
  opacity: 0.75;
  border-top: 1px dashed var(--color-border);
  padding-top: 0.5rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border-light);
  font-size: 0.8125rem;
  color: var(--color-text-sub);
}

.footer-bottom p {
  margin: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.05em;
  color: var(--color-text-main);
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  clip-path: polygon(10px 0, calc(100% - 10px) 0, 100% 10px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 10px 100%, 0 calc(100% - 10px), 0 10px);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), filter var(--transition-fast);
  cursor: pointer;
}

.btn:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-accent-lime);
  color: var(--color-accent-lime);
  transform: translateY(-2px);
}

.btn:focus-visible {
  outline: none;
  filter: drop-shadow(0 0 0 2px var(--color-accent-lime));
}

.btn--primary {
  background: var(--gradient-cta);
  color: var(--color-bg-deep);
  border-color: transparent;
}

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

.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text-main);
}

.btn--ghost:hover {
  border-color: var(--color-accent-orange);
  color: var(--color-accent-orange);
  background: rgba(255, 122, 0, 0.05);
}

/* ---------- Card ---------- */
.card {
  position: relative;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border-light);
  clip-path: polygon(16px 0, calc(100% - 16px) 0, 100% 16px, 100% calc(100% - 16px), calc(100% - 16px) 100%, 16px 100%, 0 calc(100% - 16px), 0 16px);
  transition: border-color var(--transition-base), background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  border-color: var(--color-border);
  background: var(--color-bg-elevated);
  transform: translateY(-3px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
}

.card__media {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border-light);
}

.card__body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.card__text {
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 1.6;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-accent-lime);
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---------- Section ---------- */
.section {
  padding: 4.5rem 0;
}

.section--tight {
  padding: 2.5rem 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.section-head__eyebrow {
  display: block;
  font-family: var(--font-editorial);
  font-style: italic;
  font-size: 0.9375rem;
  letter-spacing: 0.05em;
  color: var(--color-accent-orange);
  margin-bottom: 0.5rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--color-accent-lime);
}

.section-head__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
}

.section-head__desc {
  margin-top: 0.75rem;
  font-size: 1rem;
  color: var(--color-text-sub);
  line-height: 1.7;
}

/* ---------- Page Hero ---------- */
.page-hero {
  position: relative;
  padding: 4rem 0 3.5rem;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-progress);
  clip-path: polygon(0 0, 100% 0, calc(100% - 40px) 100%, 0 100%);
}

.page-hero__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2.25rem, 5.5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  max-width: 900px;
}

.page-hero__desc {
  margin-top: 1rem;
  max-width: 680px;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

.page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-sub);
}

.page-hero__meta strong {
  color: var(--color-accent-lime);
  font-weight: 700;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  padding: 1rem 0;
  font-size: 0.8125rem;
  color: var(--color-text-sub);
}

.breadcrumb a {
  color: var(--color-text-sub);
  transition: color var(--transition-fast);
}

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

.breadcrumb span[aria-hidden="true"] {
  color: var(--color-accent-orange);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* ---------- Scroll Section / Reveal ---------- */
[data-section] {
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

[data-section].is-in-view {
  background: rgba(17, 27, 45, 0.65);
  border-color: var(--color-border);
  box-shadow: 0 0 48px rgba(77, 208, 225, 0.04);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ---------- Image Frame ---------- */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  clip-path: polygon(14px 0, calc(100% - 14px) 0, 100% 14px, 100% calc(100% - 14px), calc(100% - 14px) 100%, 14px 100%, 0 calc(100% - 14px), 0 14px);
  background: var(--color-bg-elevated);
}

.img-frame--wide {
  aspect-ratio: 16 / 9;
}

.img-frame--portrait {
  aspect-ratio: 4 / 5;
}

.img-frame--square {
  aspect-ratio: 1 / 1;
}

.img-frame__placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--color-text-sub);
  background:
    linear-gradient(135deg, rgba(255, 122, 0, 0.08), rgba(163, 255, 18, 0.04)),
    repeating-linear-gradient(45deg, rgba(77, 208, 225, 0.06) 0 1px, transparent 1px 14px),
    var(--color-bg-elevated);
}

.img-frame__placeholder::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(90deg, transparent 0%, rgba(77, 208, 225, 0.12) 45%, transparent 65%);
  transform: translateX(-100%);
  animation: scan-line 4.5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes scan-line {
  0% { transform: translateX(-100%); }
  55% { transform: translateX(100%); }
  100% { transform: translateX(100%); }
}

/* ---------- Accessibility / Motion ---------- */
@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;
  }

  .live-status__dot {
    animation: none !important;
    box-shadow: 0 0 6px rgba(163, 255, 18, 0.6);
  }

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

  [data-section] {
    transition: none !important;
  }

  .img-frame__placeholder::after {
    animation: none !important;
    transform: none;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1120px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .brand__tagline {
    display: none;
  }
}

@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .header-utilities {
    gap: 0.5rem;
  }

  .live-status__text,
  .v3-entry__text {
    display: none;
  }

  .live-status,
  .v3-entry {
    padding: 0.35rem 0.55rem;
  }

  .site-header__top {
    min-height: 56px;
  }

  .site-header__bottom {
    border-top: none;
  }

  .site-nav {
    flex-direction: column;
    align-items: stretch;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    gap: 0;
    transition: max-height 0.35s ease-out, opacity 0.3s ease-out, visibility 0.3s ease-out;
  }

  .site-nav[data-open] {
    max-height: 500px;
    opacity: 1;
    visibility: visible;
  }

  .site-nav__link {
    min-height: 0;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--color-border-light);
    font-size: 0.9375rem;
  }

  .site-nav__link[aria-current="page"]::after {
    left: 0;
    right: auto;
    width: 3px;
    height: 100%;
    bottom: 0;
    top: 0;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .section {
    padding: 3rem 0;
  }

  .page-hero {
    padding: 2.5rem 0 2rem;
  }
}

@media (max-width: 480px) {
  .brand__divider,
  .brand__tagline {
    display: none;
  }

  .brand__text {
    flex-direction: column;
    gap: 0;
  }

  .brand__title {
    font-size: 0.9375rem;
  }
}
```