/* ============================================================
   三亿体育 Site Kit — 共享样式
   ============================================================ */

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

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

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-left: var(--rail-width);
}

main {
  display: block;
}

#main-content {
  scroll-margin-top: 80px;
}

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

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

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

button {
  cursor: pointer;
  background: none;
  border: none;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

[hidden] {
  display: none !important;
}

::selection {
  background-color: var(--color-orange);
  color: var(--color-paper);
}

:focus-visible {
  outline: 3px solid var(--color-orange);
  outline-offset: 2px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Variables ---------- */
:root {
  --color-paper: #F7F2E8;
  --color-ink: #1B1B1F;
  --color-orange: #FF4D1C;
  --color-orange-glow: #FF6A3D;
  --color-blue: #0F2A4A;
  --color-silver: #C0C4CC;
  --color-gray: #F0F0F0;
  --color-mgray: #4A4A4A;

  --font-body: -apple-system, "Noto Sans SC", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, monospace;

  --rail-width: 272px;
  --header-h: 68px;

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --radius-pill: 999px;

  --shadow-card: 0 4px 24px rgba(27, 27, 31, 0.08);
  --shadow-hover: 0 8px 32px rgba(27, 27, 31, 0.14);

  --container: 1200px;

  --transition-base: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 3000;
  background: var(--color-orange);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 4px 20px rgba(255, 77, 28, 0.45);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 16px;
}

/* ============================================================
   Header — 桌面端左侧固定框架式导航栏
   ============================================================ */
.site-head {
  position: fixed;
  z-index: 999;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-width);
  background: var(--color-ink);
  color: var(--color-paper);
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(192, 196, 204, 0.12);
}

/* 顶部橙红对角光带 */
.site-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-orange-glow) 100%);
  transform: skewY(-0.8deg);
  transform-origin: left;
  z-index: 2;
}

/* 右侧滚动纹理细条 */
.site-head::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 6px;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 6px,
    rgba(255, 77, 28, 0.05) 6px 12px
  );
  pointer-events: none;
}

.site-head__inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 28px 20px 20px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(192, 196, 204, 0.3) transparent;
}

/* ---------- Brand ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1;
  transition: opacity var(--transition-base);
}

.brand:hover,
.brand:focus-visible {
  opacity: 0.85;
}

.brand__glyph {
  width: 16px;
  height: 16px;
  background: var(--color-orange);
  transform: rotate(45deg);
  border-radius: 3px;
  position: relative;
  flex-shrink: 0;
}

.brand__glyph::before {
  content: "";
  position: absolute;
  inset: 4px;
  background: var(--color-ink);
  transform: rotate(45deg);
  border-radius: 1px;
}

.brand__word {
  color: var(--color-paper);
  white-space: nowrap;
}

/* 页脚品牌 */
.brand--foot .brand__word {
  color: var(--color-paper);
}

.site-head__top {
  flex-shrink: 0;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(192, 196, 204, 0.18);
  margin-bottom: 24px;
}

.site-head__tag {
  margin-top: 12px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-silver);
  text-transform: uppercase;
  font-family: var(--font-mono);
}

/* ---------- Nav Toggle (mobile only) ---------- */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(247, 242, 232, 0.3);
  border-radius: var(--radius-sm);
  position: relative;
  z-index: 1001;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  flex-shrink: 0;
}

.nav-toggle__bar {
  width: 20px;
  height: 2px;
  background: var(--color-paper);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.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-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.site-nav__heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.site-nav__eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-silver);
  font-family: var(--font-mono);
}

.site-nav__line {
  flex: 1;
  height: 1px;
  background: rgba(192, 196, 204, 0.2);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 12px;
  border-radius: var(--radius-md);
  color: var(--color-silver);
  transition: background var(--transition-base), color var(--transition-base), transform 0.1s ease;
  position: relative;
  overflow: hidden;
}

.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 4px;
  height: 60%;
  background: var(--color-orange);
  border-radius: 0 4px 4px 0;
  transition: transform var(--transition-base);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-silver);
  opacity: 0.55;
  min-width: 22px;
  transition: color var(--transition-base), opacity var(--transition-base);
}

.site-nav__label {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.site-nav__arrow {
  margin-left: auto;
  font-size: 0.9rem;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  color: var(--color-orange-glow);
}

.site-nav__link:hover {
  background: rgba(247, 242, 232, 0.06);
  color: var(--color-paper);
}

.site-nav__link:hover .site-nav__arrow {
  opacity: 1;
  transform: translateX(0);
}

.site-nav__link:active {
  transform: scale(0.97);
}

.site-nav__link[aria-current="page"] {
  background: rgba(255, 77, 28, 0.12);
  color: var(--color-paper);
}

.site-nav__link[aria-current="page"]::before {
  transform: translateY(-50%) scaleY(1);
}

.site-nav__link[aria-current="page"] .site-nav__idx {
  color: var(--color-orange);
  opacity: 1;
}

.site-nav__link[aria-current="page"] .site-nav__arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ---------- Header Search ---------- */
.site-head__search {
  flex-shrink: 0;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(192, 196, 204, 0.18);
  margin-bottom: 14px;
}

.search-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  background: rgba(247, 242, 232, 0.06);
  color: var(--color-silver);
  font-size: 0.82rem;
  font-weight: 600;
  transition: background var(--transition-base), color var(--transition-base);
  width: 100%;
}

.search-toggle:hover,
.search-toggle[aria-expanded="true"] {
  background: rgba(255, 77, 28, 0.16);
  color: var(--color-paper);
}

.search-toggle__icon {
  font-size: 1.1rem;
  line-height: 1;
  color: var(--color-orange-glow);
}

.page-search {
  margin-top: 10px;
  padding: 14px;
  background: rgba(247, 242, 232, 0.07);
  border-radius: var(--radius-md);
}

.page-search[hidden] {
  display: none;
}

.page-search__label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-silver);
  margin-bottom: 8px;
}

.page-search__input {
  width: 100%;
  padding: 10px 14px;
  background: var(--color-ink);
  border: 1px solid rgba(192, 196, 204, 0.3);
  border-radius: var(--radius-sm);
  color: var(--color-paper);
  font-size: 0.88rem;
  transition: border-color var(--transition-base);
}

.page-search__input:focus {
  border-color: var(--color-orange);
  outline: none;
}

.page-search__input::placeholder {
  color: rgba(192, 196, 204, 0.4);
}

.page-search__hint {
  font-size: 0.7rem;
  color: rgba(192, 196, 204, 0.5);
  margin-top: 8px;
}

/* ---------- Header Meta ---------- */
.site-head__meta {
  flex-shrink: 0;
  padding-top: 12px;
}

.site-head__status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--color-silver);
  font-family: var(--font-mono);
}

.site-head__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-orange);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(255, 77, 28, 0.45);
  }
  50% {
    opacity: 0.7;
    box-shadow: 0 0 0 6px rgba(255, 77, 28, 0);
  }
}

.site-head__version {
  margin-top: 6px;
  font-size: 0.7rem;
  color: rgba(192, 196, 204, 0.5);
  letter-spacing: 0.06em;
}

/* ============================================================
   Footer — 夜空蓝数据面板式页脚
   ============================================================ */
.site-foot {
  position: relative;
  background: var(--color-blue);
  color: rgba(247, 242, 232, 0.85);
  overflow: hidden;
}

/* 顶部橙红渐变条 */
.site-foot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-orange-glow) 60%, transparent 100%);
}

/* 右下角装饰圆环 */
.site-foot::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 1px solid rgba(192, 196, 204, 0.12);
  border-radius: 50%;
  pointer-events: none;
}

.site-foot__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 32px 32px;
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 1.2fr;
  gap: 48px 32px;
  position: relative;
  z-index: 1;
}

.site-foot__brand .brand {
  margin-bottom: 18px;
}

.site-foot__intro {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(247, 242, 232, 0.65);
  max-width: 320px;
}

.site-foot__trust {
  margin-top: 18px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--color-silver);
  border-left: 3px solid var(--color-orange);
  padding-left: 14px;
  max-width: 320px;
}

.site-foot__head {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-silver);
  margin-bottom: 18px;
  font-family: var(--font-mono);
}

.site-foot__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-foot__list a {
  font-size: 0.9rem;
  color: rgba(247, 242, 232, 0.75);
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.site-foot__list a:hover,
.site-foot__list a:focus-visible {
  color: var(--color-orange-glow);
  padding-left: 5px;
}

.site-foot__contact {
  font-size: 0.88rem;
}

.site-foot__item {
  line-height: 1.9;
  color: rgba(247, 242, 232, 0.75);
}

.site-foot__bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(192, 196, 204, 0.14);
  padding-top: 20px;
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 0.76rem;
  color: rgba(247, 242, 232, 0.5);
}

/* ============================================================
   Container / Section / Grid
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 32px;
}

.section {
  padding-block: 80px;
}

.section--alt {
  background: var(--color-gray);
}

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

.section--paper {
  background: var(--color-paper);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}

.section-head__inner {
  max-width: 720px;
}

.section-head__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-orange);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-head__eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--color-orange);
  display: inline-block;
  flex-shrink: 0;
}

.section-head__title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin-top: 12px;
}

.section-head__desc {
  margin-top: 12px;
  color: var(--color-mgray);
  font-size: 0.95rem;
  max-width: 640px;
}

/* ---------- 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);
}

.grid--aside {
  grid-template-columns: 1fr 320px;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  border: 2px solid transparent;
  transition: all var(--transition-base);
  cursor: pointer;
  line-height: 1.4;
}

.btn--primary {
  background: var(--color-orange);
  color: #fff;
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--color-orange-glow);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(255, 77, 28, 0.35);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-ink);
  color: var(--color-paper);
}

.btn--light {
  background: transparent;
  border-color: rgba(247, 242, 232, 0.55);
  color: var(--color-paper);
}

.btn--light:hover,
.btn--light:focus-visible {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: #fff;
}

.btn--sm {
  padding: 8px 20px;
  font-size: 0.82rem;
}

/* ============================================================
   Cards / Data Panel
   ============================================================ */
.card {
  background: var(--color-paper);
  border: 1px solid rgba(192, 196, 204, 0.4);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card--dark {
  background: var(--color-ink);
  color: var(--color-paper);
  border-color: transparent;
}

.data-panel {
  background: var(--color-blue);
  color: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: 30px;
  position: relative;
  overflow: hidden;
}

.data-panel::after {
  content: "";
  position: absolute;
  right: -24px;
  bottom: -24px;
  width: 130px;
  height: 130px;
  border: 2px solid rgba(255, 77, 28, 0.35);
  border-radius: 50%;
  pointer-events: none;
}

.data-panel__value {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-orange-glow);
}

.data-panel__label {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--color-silver);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ============================================================
   Tags / Filter
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--color-gray);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  color: var(--color-mgray);
  font-weight: 600;
  letter-spacing: 0.03em;
  border: 1px solid transparent;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.tag--active {
  background: var(--color-orange);
  color: var(--color-paper);
}

.tag:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-btn {
  padding: 9px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-silver);
  background: transparent;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-mgray);
  cursor: pointer;
  transition: all var(--transition-base);
}

.filter-btn:hover,
.filter-btn.is-active {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: var(--color-paper);
}

/* ============================================================
   Breadcrumbs
   ============================================================ */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--color-mgray);
  padding: 18px 0;
}

.breadcrumbs__item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__item a {
  color: var(--color-mgray);
  transition: color var(--transition-base);
}

.breadcrumbs__item a:hover,
.breadcrumbs__item a:focus-visible {
  color: var(--color-orange);
}

.breadcrumbs__item--current {
  color: var(--color-ink);
  font-weight: 700;
}

.breadcrumbs__sep {
  color: var(--color-silver);
}

/* ============================================================
   Media Placeholder
   ============================================================ */
.media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-blue);
}

.media::before {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.media--wide::before {
  padding-top: 42%;
}

.media--square::before {
  padding-top: 100%;
}

.media--tall::before {
  padding-top: 130%;
}

.media__inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(247, 242, 232, 0.45);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background:
    linear-gradient(135deg, rgba(255, 77, 28, 0.08) 0%, transparent 50%),
    repeating-linear-gradient(-45deg, transparent 0 14px, rgba(192, 196, 204, 0.06) 14px 28px);
}

/* ============================================================
   Scroll Progress / Back to Top
   ============================================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--rail-width);
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-orange), var(--color-orange-glow));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 2000;
  pointer-events: none;
}

.back-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-orange);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 6px 24px rgba(255, 77, 28, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-base);
  z-index: 1500;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover,
.back-top:focus-visible {
  background: var(--color-orange-glow);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255, 106, 61, 0.5);
}

/* ============================================================
   Reveal Animation
   ============================================================ */
.reveal-hidden {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal-hidden.is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   Responsive — Tablet & Mobile
   ============================================================ */
@media (max-width: 1023px) {
  body {
    padding-left: 0;
  }

  /* ---------- Header becomes top bar ---------- */
  .site-head {
    position: sticky;
    top: 0;
    bottom: auto;
    width: 100%;
    height: var(--header-h);
    border-right: none;
    border-bottom: 1px solid rgba(192, 196, 204, 0.12);
  }

  .site-head__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    overflow: visible;
    gap: 10px;
    height: 100%;
  }

  .site-head__top {
    padding-bottom: 0;
    border-bottom: none;
    margin-bottom: 0;
    margin-right: auto;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .site-head__tag,
  .site-head__meta {
    display: none;
  }

  /* ---------- Nav toggle visible ---------- */
  .nav-toggle {
    display: flex;
  }

  /* ---------- Nav overlay ---------- */
  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-ink);
    padding: 32px 28px;
    overflow-y: auto;
    transform: translateY(-110%);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    display: block;
    z-index: 998;
  }

  .site-nav[data-open] {
    transform: translateY(0);
  }

  /* ---------- Search overlay ---------- */
  .site-head__search {
    padding-bottom: 0;
    border-bottom: none;
    margin-bottom: 0;
  }

  .search-toggle {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    background: transparent;
  }

  .search-toggle__text {
    display: none;
  }

  .page-search {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    margin-top: 0;
    border-radius: 0;
    padding: 16px 24px;
    background: var(--color-blue);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
    z-index: 997;
  }

  /* ---------- Scroll progress full width ---------- */
  .scroll-progress {
    left: 0;
  }

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

  .grid--aside {
    grid-template-columns: 1fr;
  }

  /* ---------- Footer ---------- */
  .site-foot__inner {
    grid-template-columns: 1fr 1fr;
    padding: 48px 28px 28px;
    gap: 36px 24px;
  }
}

@media (max-width: 767px) {
  /* ---------- Sections ---------- */
  .section {
    padding-block: 48px;
  }

  .section-head {
    margin-bottom: 32px;
    flex-direction: column;
    align-items: flex-start;
  }

  /* ---------- Container ---------- */
  .container {
    padding-inline: 20px;
  }

  /* ---------- Grid collapse ---------- */
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  /* ---------- Footer single column ---------- */
  .site-foot__inner {
    grid-template-columns: 1fr;
    padding: 40px 20px 24px;
    gap: 28px;
  }

  .site-foot__bottom {
    flex-direction: column;
    gap: 6px;
  }

  /* ---------- Header brand size ---------- */
  .brand {
    font-size: 1.3rem;
  }

  .brand__glyph {
    width: 14px;
    height: 14px;
  }

  /* ---------- Search panel padding ---------- */
  .page-search {
    padding: 14px 20px;
  }

  .page-search__inner {
    max-width: 100%;
  }

  /* ---------- Back top ---------- */
  .back-top {
    bottom: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
  }
}

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

  .reveal-hidden {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .nav-toggle__bar {
    transition: none !important;
  }

  .site-head__dot {
    animation: none !important;
  }
}