/* ==========================================================
   亚博竞界 · shared site.css
   负责：reset / 变量 / 排版 / 头部侧栏 / 页脚 / 通用组件
   ========================================================== */

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

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

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #132a4a;
  background: #f5f1e8;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

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

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
}

button {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid #ff6b35;
  outline-offset: 3px;
}

::selection {
  background: #ff6b35;
  color: #ffffff;
}

/* ---------- Design Tokens ---------- */
:root {
  --c-blue: #0b1d3a;
  --c-blue-2: #122a50;
  --c-blue-3: #1b3a6b;
  --c-blue-deep: #061224;
  --c-stone: #8a8d8f;
  --c-moss: #4a5d4e;
  --c-clay: #c2765a;
  --c-cream: #f5f1e8;
  --c-ember: #ff6b35;
  --c-ember-2: #ff8a5c;
  --c-silver: #c0c5c9;
  --c-white: #ffffff;
  --c-ink: #132a4a;

  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  --font-display: 'Oswald', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-num: 'DIN', 'Bahnschrift', 'Roboto Mono', 'SFMono-Regular', 'DejaVu Sans Mono', monospace;

  --sidebar-w: 300px;
  --topbar-h: 64px;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;

  --border-w: 2px;
  --border-wx: 4px;
  --radius: 3px;
  --shadow-1: 3px 3px 0 rgba(11, 29, 58, 0.92);
  --shadow-2: 8px 8px 0 rgba(11, 29, 58, 0.9);
  --shadow-3: 12px 12px 0 rgba(11, 29, 58, 0.16);
  --ease: 240ms cubic-bezier(0.2, 0.6, 0.2, 1);
  --container: 1280px;

  --scroll: 0;
}

/* ---------- Base Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-blue);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.05rem; }

p { margin-bottom: 1em; }

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 1000;
  padding: 12px 24px;
  background: var(--c-white);
  color: var(--c-blue);
  border: 3px solid var(--c-blue);
  box-shadow: 5px 5px 0 var(--c-ember);
  font-weight: 700;
  font-size: 15px;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 20px;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

/* ---------- Main Content ---------- */
#main-content {
  display: block;
  width: 100%;
  min-height: 70vh;
  padding: calc(var(--topbar-h) + var(--space-4)) var(--space-3) var(--space-6);
  background: var(--c-cream);
}
#main-content:focus {
  outline: none;
}

@media (min-width: 1024px) {
  #main-content {
    margin-left: var(--sidebar-w);
    padding: var(--space-5) var(--space-6) var(--space-7, 96px);
  }
}

/* ---------- Content Area (long-form) ---------- */
.content-area {
  max-width: 760px;
  margin-inline: auto;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-ink);
}
.content-area p {
  margin-bottom: 1.2em;
}
.content-area h2,
.content-area h3 {
  margin-top: 1.8em;
}

/* ---------- Section Heading ---------- */
.sec-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-blue);
  transform: skew(-5deg);
  padding-left: 20px;
  position: relative;
  margin-bottom: var(--space-3);
}
.sec-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.1em;
  bottom: 0.12em;
  width: 5px;
  background: var(--c-ember);
}
.sec-title__index {
  display: block;
  font-family: var(--font-num);
  font-size: 0.36em;
  font-weight: 400;
  letter-spacing: 0.35em;
  color: var(--c-clay);
  margin-bottom: 6px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0.85em 1.8em;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-white);
  background: var(--c-blue);
  border: 2px solid var(--c-blue);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 var(--c-stone);
  cursor: pointer;
  transition:
    background var(--ease),
    color var(--ease),
    border-color var(--ease),
    box-shadow var(--ease),
    transform var(--ease);
}
.btn:hover {
  box-shadow: 6px 6px 0 var(--c-ember);
  transform: translate(-1px, -1px);
}
.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--c-stone);
}
.btn--ci {
  background: var(--c-ember);
  border-color: var(--c-ember);
}
.btn--ci:hover {
  box-shadow: 6px 6px 0 var(--c-stone);
}
.btn--outline {
  background: transparent;
  color: var(--c-blue);
  border-color: var(--c-blue);
}
.btn--outline:hover {
  background: var(--c-blue);
  color: var(--c-white);
}
.btn--ghost {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  color: var(--c-blue);
}
.btn--ghost:hover {
  color: var(--c-clay);
}
.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- Card ---------- */
.card {
  position: relative;
  background: var(--c-white);
  border: var(--border-w) solid var(--c-blue);
  box-shadow: var(--shadow-1);
  border-radius: var(--radius);
  padding: var(--space-4);
  transition: box-shadow var(--ease), transform var(--ease);
}
.card:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}
.card--dark {
  background: var(--c-blue);
  color: var(--c-cream);
  border-color: var(--c-blue);
}
.card--dark h1,
.card--dark h2,
.card--dark h3,
.card--dark h4 {
  color: var(--c-white);
}
.card--tick::after {
  content: '';
  position: absolute;
  top: -2px;
  right: -2px;
  width: 26px;
  height: 26px;
  border-top: 4px solid var(--c-ember);
  border-right: 4px solid var(--c-ember);
}
.card--flat {
  box-shadow: none;
  border-style: solid;
}

/* ---------- Tag ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  border-radius: 3px;
}
.tag--ember {
  background: rgba(255, 107, 53, 0.12);
  color: var(--c-ember);
  border-color: rgba(255, 107, 53, 0.35);
}
.tag--moss {
  background: rgba(74, 93, 78, 0.13);
  color: var(--c-moss);
  border-color: rgba(74, 93, 78, 0.35);
}
.tag--clay {
  background: rgba(194, 118, 90, 0.12);
  color: var(--c-clay);
  border-color: rgba(194, 118, 90, 0.35);
}
.tag--stone {
  background: rgba(138, 141, 143, 0.13);
  color: var(--c-stone);
  border-color: rgba(138, 141, 143, 0.35);
}
.tag--blue {
  background: rgba(11, 29, 58, 0.07);
  color: var(--c-blue);
  border-color: rgba(11, 29, 58, 0.22);
}

/* ---------- Data Line ---------- */
.data-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-num);
}
.data-line__value {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1;
  color: var(--c-blue);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.data-line__value--accent {
  color: var(--c-ember);
}
.data-line__label {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--c-stone);
  letter-spacing: 0.1em;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-3);
  font-size: 13px;
  font-family: var(--font-num);
  letter-spacing: 0.08em;
  color: var(--c-stone);
}
.breadcrumb a {
  color: var(--c-blue);
  transition: color 0.2s;
}
.breadcrumb a:hover {
  color: var(--c-ember);
}
.breadcrumb__sep {
  display: inline-block;
  transform: skew(-15deg);
  opacity: 0.55;
}
.breadcrumb [aria-current="page"] {
  color: var(--c-clay);
  font-weight: 600;
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}
@media (min-width: 600px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 900px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- Image Frame ---------- */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--c-stone);
  border: var(--border-w) solid var(--c-blue);
  box-shadow: var(--shadow-1);
  aspect-ratio: 16 / 9;
}
.img-frame--wide {
  aspect-ratio: 21 / 9;
}
.img-frame--portrait {
  aspect-ratio: 4 / 5;
}
.img-frame--tall {
  aspect-ratio: 3 / 4;
}
.img-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  pointer-events: none;
}

/* ==========================================================
   Site Header — 左侧品牌轨道 / 移动端顶栏+抽屉
   ========================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  background: var(--c-blue);
  color: var(--c-white);
  border-bottom: 3px solid var(--c-blue-deep);
  box-shadow: 0 4px 0 rgba(192, 197, 201, 0.4);
}

/* 顶部条 */
.site-header__top {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-h);
  padding: 0 16px;
  background: linear-gradient(90deg, var(--c-blue), var(--c-blue-2));
}

/* 遮罩层 */
.site-header__overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: rgba(6, 18, 36, 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0s linear 0.3s;
}
.site-header[data-open] .site-header__overlay {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease, visibility 0s linear 0s;
}

/* 抽屉 */
.site-header__drawer {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  z-index: 3;
  width: min(84vw, 340px);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-4) 18px var(--space-5);
  background: var(--c-blue);
  border-right: 3px solid var(--c-blue-deep);
  box-shadow: 12px 0 40px rgba(6, 18, 36, 0.45);
  transform: translateX(-105%);
  visibility: hidden;
  overflow-y: auto;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1), visibility 0s linear 0.3s;
}
.site-header[data-open] .site-header__drawer {
  transform: translateX(0);
  visibility: visible;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1), visibility 0s linear 0s;
}

/* 品牌 */
.site-brand {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  line-height: 1.05;
  padding: 6px 12px 6px 0;
  color: var(--c-white);
}
.site-brand::before {
  content: '';
  position: absolute;
  top: -4px;
  right: -2px;
  width: 18px;
  height: 18px;
  border-top: 3px solid var(--c-ember);
  border-right: 3px solid var(--c-ember);
  opacity: 0.75;
}
.site-brand__sub {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.35em;
  color: var(--c-silver);
}
.site-brand__name {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-white);
  line-height: 1;
  transform: skew(-6deg);
}
.site-brand__slogan {
  display: none;
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: rgba(192, 197, 201, 0.65);
  text-transform: uppercase;
}

/* 导航 */
.site-nav {
  flex: 0 0 auto;
  margin-bottom: var(--space-5);
}
.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.site-nav__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 14px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: rgba(245, 241, 232, 0.72);
  border-left: 3px solid transparent;
  transition:
    background var(--ease),
    color var(--ease),
    border-color var(--ease),
    transform var(--ease);
}
.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--c-white);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.16), rgba(255, 107, 53, 0));
  border-left-color: var(--c-ember);
  transform: translateX(4px);
}
.site-nav__link[aria-current="page"] {
  color: var(--c-white);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.22), rgba(255, 107, 53, 0));
  border-left-color: var(--c-ember);
  transform: translateX(4px);
}
.site-nav__link[aria-current="page"] .site-nav__num {
  color: var(--c-ember);
}
.site-nav__num {
  min-width: 24px;
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--c-silver);
  opacity: 0.85;
  text-align: right;
  letter-spacing: 0;
}
.site-nav__label {
  flex: 1;
}

/* 面板（搜索/状态/位置/进度） */
.site-header__panel {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  position: relative;
}

/* 搜索 */
.site-search {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  padding: 6px 10px;
  background: rgba(6, 18, 36, 0.55);
  transition: border-color var(--ease), background var(--ease);
}
.site-search:focus-within {
  border-color: var(--c-ember);
  background: var(--c-blue-deep);
}
.site-search__input {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  color: var(--c-white);
  padding: 2px 0;
  background: transparent;
}
.site-search__input::placeholder {
  color: rgba(255, 255, 255, 0.35);
}
.site-search__hint {
  font-family: var(--font-num);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 3px;
  padding: 1px 6px;
  line-height: 1.4;
  transition: color var(--ease), border-color var(--ease);
}
.site-search:focus-within .site-search__hint {
  color: var(--c-ember);
  border-color: var(--c-ember);
}

/* 元信息 */
.site-header__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.08em;
}
.site-header__lang {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 3px 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 3px;
}
.site-header__live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--c-moss);
}
.site-header__live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-moss);
  box-shadow: 0 0 6px rgba(74, 93, 78, 0.6);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.85);
  }
}

/* 浏览位置 */
.site-header__position {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.site-header__position-label {
  font-size: 10px;
  letter-spacing: 0.25em;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
}
.site-header__position-name {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 滚动进度 */
.site-header__progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  width: auto;
  height: 3px;
  background: linear-gradient(90deg, var(--c-ember), var(--c-clay));
  transform: scaleX(var(--scroll, 0));
  transform-origin: left center;
  transition: transform 0.2s linear;
}

/* 汉堡按钮 */
.site-nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  color: var(--c-white);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
  transition: border-color var(--ease), background var(--ease);
}
.site-nav-toggle:hover {
  border-color: var(--c-ember);
  background: rgba(255, 107, 53, 0.1);
}
.site-nav-toggle__icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 20px;
}
.site-nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: transform 0.28s ease, opacity 0.28s ease;
}
.site-nav-toggle__label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
}
.site-header[data-open] .site-nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-header[data-open] .site-nav-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0.4);
}
.site-header[data-open] .site-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.site-header[data-open] .site-nav-toggle {
  border-color: var(--c-ember);
}

/* ==========================================================
   Site Footer
   ========================================================== */
.site-footer {
  position: relative;
  margin-top: 0;
  background: linear-gradient(180deg, var(--c-blue-deep), var(--c-blue));
  color: rgba(245, 241, 232, 0.78);
  overflow: hidden;
  padding-block: var(--space-5) var(--space-3);
}
.site-footer::before {
  content: '';
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: linear-gradient(90deg, var(--c-ember) 0 28%, var(--c-clay) 52%, rgba(194, 118, 90, 0.15) 85%, transparent);
}
.site-footer::after {
  content: 'AG';
  position: absolute;
  right: -20px;
  bottom: -60px;
  font-family: var(--font-num);
  font-size: 220px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(255, 255, 255, 0.025);
  pointer-events: none;
  user-select: none;
}
.site-footer__container {
  position: relative;
  z-index: 1;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding-block: var(--space-5) var(--space-4);
}

.site-brand--footer .site-brand__name {
  transform: skew(-6deg);
}
.site-brand--footer::before {
  border-color: var(--c-clay);
}
.site-footer__slogan {
  margin-top: 12px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: rgba(245, 241, 232, 0.45);
  max-width: 18em;
}
.site-footer__heading {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: rgba(245, 241, 232, 0.45);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}
.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}
.site-footer__list a {
  color: rgba(245, 241, 232, 0.72);
  transition: color var(--ease), padding-left var(--ease);
}
.site-footer__list a:hover {
  color: var(--c-ember);
  padding-left: 4px;
}
.site-footer__list--plain li {
  color: rgba(245, 241, 232, 0.6);
  font-size: 13px;
  line-height: 1.6;
}
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  padding: var(--space-3) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: rgba(245, 241, 232, 0.55);
}
.site-footer__trust {
  flex-basis: 100%;
  color: rgba(245, 241, 232, 0.38);
}
.site-footer__disclaimer {
  padding-top: var(--space-3);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 241, 232, 0.42);
}

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

/* ==========================================================
   Back to Top
   ========================================================== */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--c-blue);
  color: var(--c-white);
  border: 2px solid var(--c-cream);
  box-shadow: 5px 5px 0 var(--c-ember);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition:
    opacity var(--ease),
    visibility var(--ease),
    transform var(--ease),
    background var(--ease),
    box-shadow var(--ease);
}
.back-to-top[data-show] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--c-ember);
  box-shadow: 5px 5px 0 var(--c-blue);
}
.back-to-top__arrow {
  font-size: 18px;
  line-height: 1;
}

/* ==========================================================
   Desktop — Sidebar Expansion
   ========================================================== */
@media (min-width: 1024px) {
  .site-header {
    right: auto;
    bottom: 0;
    width: var(--sidebar-w);
    border-right: 3px solid var(--c-blue-deep);
    border-bottom: none;
    box-shadow: 8px 0 28px rgba(6, 18, 36, 0.32);
    display: flex;
    flex-direction: column;
  }

  .site-header__top {
    height: auto;
    padding: var(--space-5) var(--space-4) var(--space-4);
    background: transparent;
  }

  .site-header__drawer {
    position: static;
    width: 100%;
    flex: 1;
    gap: var(--space-4);
    padding: 0 var(--space-4) var(--space-4);
    background: transparent;
    border-right: none;
    box-shadow: none;
    transform: none;
    visibility: visible;
    opacity: 1;
    overflow-y: auto;
  }

  .site-header[data-open] .site-header__drawer {
    transform: none;
    visibility: visible;
  }

  .site-header__overlay {
    display: none;
  }

  .site-header__top .site-brand {
    padding: 6px 12px 6px 0;
  }
  .site-header__top .site-brand__slogan {
    display: block;
  }
  .site-header__top .site-brand__name {
    font-size: 30px;
  }

  .site-nav {
    flex: 1;
    margin-bottom: 0;
    display: flex;
    align-items: stretch;
  }
  .site-nav__list {
    width: 100%;
  }

  .site-header__panel {
    padding-top: var(--space-3);
  }
  .site-header__progress {
    top: 0;
    bottom: 0;
    left: auto;
    right: 0;
    width: 4px;
    height: auto;
    background: linear-gradient(180deg, var(--c-ember), var(--c-clay));
    transform: scaleY(var(--scroll, 0));
    transform-origin: center top;
  }

  .site-nav-toggle {
    display: none;
  }

  .site-footer {
    margin-left: var(--sidebar-w);
  }
  .site-footer__grid {
    grid-template-columns: 1.3fr 0.8fr 0.8fr 1.1fr;
    gap: var(--space-5);
  }
  .site-footer__trust {
    flex-basis: auto;
    margin-left: auto;
  }
}

/* ==========================================================
   Reduced 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;
  }
  .site-header__progress {
    transition: none;
  }
  .back-to-top {
    transition: none;
  }
  .site-header__live-dot {
    animation: none;
  }
}