/* ============================================
   爱游戏体育CN · 全站共享样式
   路径 /assets/site.css
   ============================================ */

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

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

body {
  min-height: 100vh;
  background: var(--color-base);
  color: var(--color-text-dim);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ---------- CSS Variables ---------- */
:root {
  --color-base: #0B1E3F;
  --color-panel: #123A6B;
  --color-ink: #071427;
  --color-accent: #FF6B35;
  --color-teal: #00C896;
  --color-surface: #F0F2F5;
  --color-white: #FFFFFF;
  --color-body: #2C2C2C;
  --color-muted: #7C8898;
  --color-text-dim: #B8C0CC;
  --color-line: rgba(255, 255, 255, 0.08);

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;

  --header-height: 72px;
  --container-width: 1280px;
  --radius-sm: 6px;
  --radius: 12px;
  --transition-fast: 0.2s ease;
  --transition: 0.3s ease;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-white);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 0.5em;
}

h1 { font-size: 2.4rem; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.05rem; }

p {
  margin-bottom: 1em;
}

strong {
  font-weight: 600;
  color: var(--color-white);
}

/* ---------- Focus Visibility ---------- */
:focus-visible {
  outline: 3px solid rgba(255, 107, 53, 0.75);
  outline-offset: 2px;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 16px;
  z-index: 2000;
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-110%);
  transition: transform var(--transition-fast);
}
.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-teal) 100%);
  z-index: 2001;
  pointer-events: none;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 20, 39, 0.45);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background-color 0.35s ease, box-shadow 0.35s ease;
}
.site-header.is-scrolled {
  background: var(--color-base);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  border-bottom-color: transparent;
}
.site-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-teal) 70%, transparent 100%);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}
.site-header.is-scrolled::after {
  opacity: 1;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
}

/* Brand */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-white);
  flex-shrink: 0;
}
.site-brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 2px 10px rgba(255, 107, 53, 0.45);
  overflow: hidden;
  flex-shrink: 0;
}
.site-brand__mark::before {
  content: "";
  position: absolute;
  top: -4px;
  right: -4px;
  width: 22px;
  height: 22px;
  background: var(--color-teal);
  border-radius: 0 0 0 22px;
}
.site-brand__mark::after {
  content: "体";
  position: relative;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1;
  color: var(--color-white);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}
.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.site-brand__text strong {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--color-white);
  white-space: nowrap;
}
.site-brand__text small {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 2.5px;
  color: var(--color-teal);
  text-transform: uppercase;
}

/* Desktop Nav */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.site-nav__link {
  position: relative;
  display: block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.site-nav__link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}
.site-nav__link[aria-current="page"] {
  color: var(--color-white);
  font-weight: 700;
}
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* Header Actions */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Search */
.site-search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 100px;
  padding: 0 14px;
  height: 38px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}
.site-search:focus-within {
  border-color: var(--color-accent);
  background: rgba(255, 255, 255, 0.1);
}
.site-search__icon {
  position: relative;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  flex-shrink: 0;
}
.site-search__icon::after {
  content: "";
  position: absolute;
  bottom: -4px;
  right: -4px;
  width: 6px;
  height: 2px;
  background: rgba(255, 255, 255, 0.5);
  transform: rotate(45deg);
}
.site-search__input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-white);
  font-size: 13px;
  width: 110px;
  padding: 6px 0;
}
.site-search__input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

/* Legacy Button */
.btn--legacy {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: var(--color-white);
  padding: 7px 14px;
  font-size: 13px;
  border-radius: 100px;
  white-space: nowrap;
}
.btn--legacy:hover {
  background: rgba(255, 107, 53, 0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: none;
}

/* Nav Toggle */
.site-nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
}
.site-nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.site-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.site-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.btn:hover {
  transform: translateY(-2px);
}
.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}
.btn--primary:hover {
  background: #e85d2a;
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}
.btn--outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--color-white);
}
.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.08);
}
.btn--footer {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.18);
  color: var(--color-white);
  font-size: 13px;
  padding: 8px 16px;
  border-radius: 100px;
}
.btn--footer:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
  transform: none;
}

/* ---------- Main / Container ---------- */
.site-main {
  min-height: 70vh;
  padding-top: var(--header-height);
}
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}
.container--narrow {
  max-width: 860px;
}

/* ---------- Section ---------- */
.section {
  padding: 64px 0;
}
.section--tight {
  padding: 32px 0;
}
.section--dark {
  background: rgba(0, 0, 0, 0.18);
}
.section-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 32px;
}
.section-title::before {
  content: "";
  display: block;
  width: 4px;
  height: 28px;
  background: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}
.section-title h2 {
  margin: 0;
  font-size: 1.6rem;
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: 24px;
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 24px;
  font-size: 13px;
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 0;
}
.breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumbs__item + .breadcrumbs__item::before {
  content: "›";
  color: var(--color-muted);
}
.breadcrumbs a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.breadcrumbs a:hover {
  color: var(--color-accent);
}
.breadcrumbs [aria-current="page"] {
  color: var(--color-white);
  font-weight: 500;
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  border-color: rgba(255, 107, 53, 0.25);
}
.card__title {
  font-size: 1.1rem;
  margin-bottom: 12px;
}
.card__text {
  font-size: 14px;
  color: var(--color-text-dim);
  line-height: 1.7;
}

/* ---------- Badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  white-space: nowrap;
  background: rgba(0, 200, 150, 0.08);
  border: 1px solid rgba(0, 200, 150, 0.25);
  color: var(--color-teal);
}
.badge::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}
.badge--compat {
  background: rgba(255, 107, 53, 0.08);
  border-color: rgba(255, 107, 53, 0.25);
  color: var(--color-accent);
}

/* ---------- Filter ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--color-text-dim);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-white);
}
.filter-btn[aria-pressed="true"],
.filter-btn.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

/* ---------- Stat Box ---------- */
.stat-box {
  position: relative;
  background: var(--color-panel);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius);
  padding: 24px;
  overflow: hidden;
}
.stat-box__value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat-box__label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-top: 8px;
}
.stat-box::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 44px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-teal));
}

/* ---------- Data Table ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 14px;
}
.data-table th {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-teal);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  letter-spacing: 0.3px;
}
.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--color-text-dim);
}
.data-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* ---------- Accordion ---------- */
.accordion {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
  overflow: hidden;
}
.accordion__item + .accordion__item {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: transparent;
  border: none;
  padding: 18px 24px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  text-align: left;
  cursor: pointer;
}
.accordion__trigger:hover {
  background: rgba(255, 255, 255, 0.04);
}
.accordion__icon {
  flex-shrink: 0;
  margin-left: 16px;
  color: var(--color-accent);
  font-size: 20px;
  line-height: 1;
  transition: transform var(--transition);
}
.accordion__item[data-open="true"] .accordion__icon {
  transform: rotate(45deg);
}
.accordion__panel {
  display: none;
  padding: 0 24px 20px;
  color: var(--color-text-dim);
  line-height: 1.7;
}
.accordion__item[data-open="true"] .accordion__panel {
  display: block;
}

/* ---------- Image Frame ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-panel);
}
.img-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}
.img-frame[data-ratio="4/3"]::before { padding-top: 75%; }
.img-frame[data-ratio="1/1"]::before { padding-top: 100%; }
.img-frame[data-ratio="3/4"]::before { padding-top: 133.34%; }
.img-frame img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-frame--accent::after {
  content: "";
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 48px;
  height: 26px;
  background: var(--color-accent);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  opacity: 0.85;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: var(--color-ink);
  color: var(--color-text-dim);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-teal) 80%, transparent 100%);
}
.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 220px;
  height: 220px;
  background: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.015) 0, rgba(255, 255, 255, 0.015) 2px, transparent 2px, transparent 8px);
  pointer-events: none;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.8fr 1.1fr;
  gap: 32px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 40px;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.site-footer .site-brand {
  margin-bottom: 20px;
}
.site-footer__tagline {
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-text-dim);
  max-width: 34ch;
  margin-bottom: 20px;
}
.site-footer__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

.site-footer__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-white);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.site-footer__grid ul {
  padding: 0;
}
.site-footer__grid ul li {
  margin-bottom: 4px;
}
.site-footer__grid a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
}
.site-footer__grid a:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.site-footer__contact-list {
  list-style: none;
  font-size: 13px;
  line-height: 1.9;
  color: var(--color-text-dim);
  margin-bottom: 16px;
}
.site-footer__note {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 36ch;
}

.site-footer__bottom {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 12px;
  color: var(--color-muted);
}

/* ---------- Back To Top ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 950;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background-color var(--transition-fast);
}
.back-to-top:hover {
  background: #e85d2a;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- Legacy View Overrides ---------- */
body[data-legacy="true"] .site-header {
  background: var(--color-ink);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: none;
}
body[data-legacy="true"] .site-header::after {
  display: none;
}
body[data-legacy="true"] .site-brand__mark {
  border-radius: 0;
  box-shadow: none;
}
body[data-legacy="true"] .site-brand__mark::before {
  border-radius: 0;
}
body[data-legacy="true"] .site-nav__link {
  border-radius: 0;
}
body[data-legacy="true"] .site-nav__link::after {
  display: none;
}
body[data-legacy="true"] .btn,
body[data-legacy="true"] .card,
body[data-legacy="true"] .badge,
body[data-legacy="true"] .accordion,
body[data-legacy="true"] .stat-box,
body[data-legacy="true"] .img-frame {
  border-radius: 0;
}
body[data-legacy="true"] .site-footer {
  border-top: 3px solid var(--color-accent);
}
body[data-legacy="true"] .site-footer::before {
  display: none;
}
body[data-legacy="true"] *,
body[data-legacy="true"] *::before,
body[data-legacy="true"] *::after {
  transition-duration: 0.01s !important;
  animation-duration: 0.01s !important;
}

/* ---------- Responsive ---------- */
@media (max-width: 1200px) {
  .site-search {
    display: none;
  }
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 920px) {
  :root {
    --header-height: 64px;
  }

  .site-nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    background: var(--color-base);
    border-bottom: 1px solid transparent;
    transition: max-height 0.35s ease, border-bottom-color 0.35s ease;
  }
  .site-nav[data-open] {
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    border-bottom-color: var(--color-accent);
  }
  .site-nav__list {
    flex-direction: column;
    padding: 12px 24px 20px;
    gap: 0;
  }
  .site-nav__link {
    display: block;
    padding: 14px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 0;
    font-size: 15px;
  }
  .site-nav__link::after {
    left: 0;
    right: auto;
    width: 3px;
    height: 100%;
    bottom: 0;
    transform: scaleY(0);
    transform-origin: top;
  }
  .site-nav__link:hover {
    background: rgba(255, 255, 255, 0.05);
  }
  .site-nav__link[aria-current="page"]::after {
    transform: scaleY(1);
  }

  .btn--legacy {
    display: none;
  }

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 560px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.5rem; }

  .section {
    padding: 40px 0;
  }

  .site-brand__text strong {
    font-size: 17px;
  }
  .site-brand__text small {
    letter-spacing: 1.5px;
  }
  .site-brand__mark {
    width: 38px;
    height: 38px;
  }

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

  .site-footer__grid {
    grid-template-columns: 1fr;
    padding-top: 40px;
  }
  .site-footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}