/* ==========================================================================
   乐鱼赛场 · 共享站点样式 /assets/site.css
   导播台配色：深海蓝底 / 奶油纸阅读区 / 荧光青信号 / 珊瑚橙数据
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --ly-deep: #07263f;
  --ly-navy: #0e3b5c;
  --ly-cream: #f4ebdd;
  --ly-ink: #1c1714;
  --ly-mint: #32f2d0;
  --ly-coral: #ff6b4a;
  --ly-mist: #9bb7c4;
  --ly-amber: #d7b26d;

  --ly-hairline: rgba(50, 242, 208, 0.16);
  --ly-hairline-strong: rgba(50, 242, 208, 0.34);
  --ly-line-ink: rgba(28, 23, 20, 0.14);
  --ly-mint-wash: rgba(50, 242, 208, 0.08);
  --ly-ink-link: #0b4f63;

  --ly-shell: 1240px;
  --ly-gutter: clamp(1rem, 4vw, 3.25rem);
  --ly-radius: 2px;
  --ly-ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --ly-font-display: "Oswald", "Barlow Condensed", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ly-font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --ly-font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background-color: var(--ly-deep);
  color: var(--ly-cream);
  font-family: var(--ly-font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--ly-font-display);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.005em;
}

p, figure, blockquote {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--ly-mint);
  text-decoration: none;
  transition: color 0.18s var(--ly-ease);
}

a:hover {
  color: var(--ly-coral);
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

table {
  border-collapse: collapse;
  width: 100%;
}

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

::selection {
  background: var(--ly-mint);
  color: var(--ly-deep);
}

/* ---------- 3. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 200;
  transform: translateY(-180%);
  padding: 0.6rem 1rem;
  background: var(--ly-mint);
  color: var(--ly-deep);
  font-family: var(--ly-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  border-radius: var(--ly-radius);
  transition: transform 0.2s var(--ly-ease);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--ly-deep);
}

.skip-link:focus-visible {
  outline: 2px solid var(--ly-cream);
  outline-offset: 2px;
}

/* ---------- 4. 页头 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--ly-deep);
  background-image: linear-gradient(180deg, rgba(14, 59, 92, 0.55) 0%, rgba(7, 38, 63, 0) 100%);
  border-bottom: 1px solid var(--ly-hairline);
}

.masthead__rail {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  max-height: 48px;
  overflow: hidden;
  padding-top: 0.36rem;
  padding-bottom: 0.36rem;
  padding-inline: max(var(--ly-gutter), calc((100% - var(--ly-shell)) / 2 + var(--ly-gutter)));
  background-color: var(--ly-navy);
  border-bottom: 1px solid var(--ly-hairline);
  transition: max-height 0.3s var(--ly-ease), opacity 0.24s var(--ly-ease), padding 0.3s var(--ly-ease);
}

.masthead[data-scrolled="true"] .masthead__rail {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.masthead__pulse {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--ly-coral);
  box-shadow: 0 0 0 3px rgba(255, 107, 74, 0.18);
}

.masthead__status {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-family: var(--ly-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.03em;
  color: var(--ly-mist);
}

.masthead__stamp {
  flex: none;
  font-family: var(--ly-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ly-amber);
}

.masthead__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - (var(--ly-gutter) * 2), var(--ly-shell));
  margin-inline: auto;
  padding-block: 0.7rem;
}

.masthead__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background-image: linear-gradient(90deg, var(--ly-mint), rgba(50, 242, 208, 0.35));
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  color: var(--ly-cream);
}

.brand:hover,
.brand:focus {
  color: var(--ly-cream);
}

.brand__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--ly-hairline-strong);
  border-radius: var(--ly-radius);
  color: var(--ly-mint);
  font-family: var(--ly-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  background-image: linear-gradient(135deg, transparent 48%, rgba(50, 242, 208, 0.14) 48%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--ly-font-display);
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.brand__tag {
  margin-top: 0.18rem;
  font-family: var(--ly-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--ly-mist);
  white-space: nowrap;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--ly-hairline-strong);
  border-radius: var(--ly-radius);
  color: var(--ly-cream);
  font-family: var(--ly-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  transition: border-color 0.18s var(--ly-ease), color 0.18s var(--ly-ease), background-color 0.18s var(--ly-ease);
}

.nav-toggle:hover {
  color: var(--ly-mint);
  border-color: var(--ly-mint);
  background-color: var(--ly-mint-wash);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 8px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--ly-mint);
  transition: transform 0.22s var(--ly-ease), top 0.22s var(--ly-ease);
}

.nav-toggle__bars::before {
  top: 0;
}

.nav-toggle__bars::after {
  top: 6px;
}

.masthead[data-open="true"] .nav-toggle__bars::before {
  top: 3px;
  transform: rotate(45deg);
}

.masthead[data-open="true"] .nav-toggle__bars::after {
  top: 3px;
  transform: rotate(-45deg);
}

.nav-toggle__label {
  line-height: 1;
}

/* 导航 */
.nav {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 0.1rem;
}

.nav__item {
  position: relative;
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.68rem;
  color: var(--ly-cream);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color 0.18s var(--ly-ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0.68rem;
  right: 0.68rem;
  bottom: 0.28rem;
  height: 1px;
  background-color: var(--ly-mint);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.22s var(--ly-ease);
}

.nav__link:hover {
  color: var(--ly-mint);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

.nav__link[aria-current="page"] {
  color: var(--ly-mint);
}

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav__item--cta {
  margin-left: 0.55rem;
}

.nav__cta {
  display: inline-block;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--ly-coral);
  border-radius: var(--ly-radius);
  background-color: var(--ly-coral);
  color: #07263f;
  font-family: var(--ly-font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: background-color 0.18s var(--ly-ease), color 0.18s var(--ly-ease);
}

.nav__cta:hover {
  background-color: transparent;
  color: var(--ly-coral);
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  background-color: var(--ly-deep);
  background-image: linear-gradient(180deg, rgba(14, 59, 92, 0.42) 0%, rgba(4, 26, 44, 0.95) 100%);
  border-top: 1px solid var(--ly-hairline);
  color: var(--ly-cream);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background-image: linear-gradient(90deg, transparent, var(--ly-mint), transparent);
  opacity: 0.55;
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 0.72fr)) minmax(0, 1.25fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  width: min(100% - (var(--ly-gutter) * 2), var(--ly-shell));
  margin-inline: auto;
  padding-block: clamp(2.4rem, 6vw, 4.4rem) clamp(1.4rem, 3vw, 2.4rem);
}

.footer__brand {
  min-width: 0;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0;
  font-family: var(--ly-font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ly-cream);
}

.footer__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--ly-hairline-strong);
  border-radius: var(--ly-radius);
  color: var(--ly-mint);
  font-family: var(--ly-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  background-image: linear-gradient(135deg, transparent 48%, rgba(50, 242, 208, 0.16) 48%);
}

.footer__tagline {
  margin: 0.55rem 0 0;
  font-family: var(--ly-font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--ly-mist);
}

.footer__summary {
  margin: 1rem 0 0;
  max-width: 30ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: rgba(244, 235, 221, 0.72);
}

.footer__col {
  min-width: 0;
}

.footer__title {
  margin: 0 0 0.95rem;
  font-family: var(--ly-font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ly-amber);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.62rem;
}

.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.9rem;
  color: rgba(244, 235, 221, 0.8);
  transition: color 0.18s var(--ly-ease);
}

.footer__link::before {
  content: "";
  flex: none;
  width: 8px;
  height: 1px;
  background-color: var(--ly-mint);
  opacity: 0;
  transition: opacity 0.18s var(--ly-ease), width 0.18s var(--ly-ease);
}

.footer__link:hover {
  color: var(--ly-mint);
}

.footer__link:hover::before {
  opacity: 1;
  width: 14px;
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.16rem;
  margin: 0;
}

.footer__contact-label {
  font-family: var(--ly-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--ly-mist);
}

.footer__contact-value {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--ly-cream);
  overflow-wrap: anywhere;
}

.footer__note {
  margin: 0.2rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--ly-hairline);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--ly-mist);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.4rem;
  width: min(100% - (var(--ly-gutter) * 2), var(--ly-shell));
  margin-inline: auto;
  padding-block: 1rem 1.7rem;
  border-top: 1px solid var(--ly-hairline);
  font-family: var(--ly-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ly-mist);
}

.footer__legal,
.footer__icp {
  margin: 0;
}

.footer__icp {
  color: rgba(155, 183, 196, 0.78);
}

/* 回到顶部 */
.to-top {
  position: fixed;
  right: clamp(0.85rem, 3vw, 1.75rem);
  bottom: clamp(0.85rem, 3vw, 1.75rem);
  z-index: 80;
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--ly-hairline-strong);
  border-radius: var(--ly-radius);
  background-color: var(--ly-deep);
  color: var(--ly-cream);
  font-family: var(--ly-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  box-shadow: 0 10px 28px rgba(4, 20, 34, 0.45);
  transition: background-color 0.18s var(--ly-ease), color 0.18s var(--ly-ease), transform 0.18s var(--ly-ease);
}

.to-top[data-visible="true"] {
  display: inline-flex;
}

.to-top::before {
  content: "↑";
  font-size: 0.9rem;
  line-height: 1;
  color: var(--ly-mint);
}

.to-top:hover {
  background-color: var(--ly-mint);
  color: var(--ly-deep);
  transform: translateY(-2px);
}

.to-top:hover::before {
  color: var(--ly-deep);
}

/* ---------- 6. 布局与通用组件 ---------- */
.container {
  width: min(100% - (var(--ly-gutter) * 2), var(--ly-shell));
  margin-inline: auto;
}

.container--narrow {
  max-width: 760px;
}

.breadcrumb {
  margin: 0 0 clamp(1.2rem, 2.5vw, 2rem);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ly-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ly-mist);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: var(--ly-hairline-strong);
}

.breadcrumb__link {
  color: var(--ly-mist);
}

.breadcrumb__link:hover {
  color: var(--ly-mint);
}

.breadcrumb__current {
  color: var(--ly-cream);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--ly-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ly-mint);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background-color: currentColor;
}

.display {
  font-family: var(--ly-font-display);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.01em;
  font-size: clamp(2.6rem, 7vw, 5rem);
  text-transform: uppercase;
}

.lede {
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.85;
  color: rgba(244, 235, 221, 0.78);
}

.mono {
  font-family: var(--ly-font-mono);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.panel {
  padding: clamp(1.25rem, 2.6vw, 2rem);
  border: 1px solid var(--ly-hairline);
  border-radius: var(--ly-radius);
  background-color: var(--ly-navy);
  box-shadow: 0 1px 0 rgba(4, 20, 34, 0.35);
}

.panel--cream {
  background-color: var(--ly-cream);
  color: var(--ly-ink);
  border-color: var(--ly-line-ink);
  box-shadow: 0 1px 0 rgba(28, 23, 20, 0.06);
}

.panel--cream a {
  color: var(--ly-ink-link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.panel--cream a:hover {
  color: var(--ly-coral);
}

.panel--cream :focus-visible {
  outline-color: var(--ly-deep);
}

.panel--cream h1,
.panel--cream h2,
.panel--cream h3,
.panel--cream h4 {
  color: var(--ly-ink);
}

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.75rem);
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.3rem;
  border: 1px solid transparent;
  border-radius: var(--ly-radius);
  font-family: var(--ly-font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.18s var(--ly-ease), color 0.18s var(--ly-ease), border-color 0.18s var(--ly-ease), transform 0.18s var(--ly-ease);
}

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

.btn--primary {
  background-color: var(--ly-coral);
  border-color: var(--ly-coral);
  color: #07263f;
  font-weight: 700;
}

.btn--primary:hover {
  background-color: #ff8567;
  border-color: #ff8567;
  color: #07263f;
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--ly-hairline-strong);
  color: var(--ly-cream);
}

.btn--ghost:hover {
  background-color: var(--ly-mint-wash);
  border-color: var(--ly-mint);
  color: var(--ly-mint);
}

.btn--quiet {
  background-color: transparent;
  border-color: var(--ly-line-ink);
  color: var(--ly-ink);
}

.btn--quiet:hover {
  background-color: rgba(28, 23, 20, 0.07);
  color: var(--ly-ink);
}

/* 数据小件 */
.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--ly-hairline-strong);
  border-radius: var(--ly-radius);
  font-family: var(--ly-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--ly-mist);
  white-space: nowrap;
}

.data-chip--live {
  color: var(--ly-coral);
  border-color: rgba(255, 107, 74, 0.5);
  background-color: rgba(255, 107, 74, 0.08);
}

.status-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--ly-mint);
  box-shadow: 0 0 0 3px rgba(50, 242, 208, 0.16);
}

/* 图片容器基础规则（页面阶段放置 img / picture 即可） */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--ly-hairline);
  border-radius: var(--ly-radius);
  background-color: var(--ly-navy);
  background-image:
    radial-gradient(circle at 28% 18%, rgba(50, 242, 208, 0.14), transparent 58%),
    linear-gradient(160deg, #0e3b5c 0%, #07263f 100%);
}

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

.media--square {
  aspect-ratio: 1 / 1;
}

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

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.6rem 0.8rem;
  background-image: linear-gradient(0deg, rgba(7, 38, 63, 0.92), rgba(7, 38, 63, 0));
  font-family: var(--ly-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--ly-mist);
}

.media__tag {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--ly-radius);
  background-color: var(--ly-coral);
  color: #07263f;
  font-family: var(--ly-font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1180px) {
  .nav__link {
    padding: 0.5rem 0.48rem;
    font-size: 0.86rem;
  }

  .nav__link::after {
    left: 0.48rem;
    right: 0.48rem;
  }

  .nav__cta {
    padding: 0.45rem 0.72rem;
    font-size: 0.78rem;
  }

  .nav__item--cta {
    margin-left: 0.3rem;
  }
}

@media (max-width: 1080px) {
  .footer__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer__brand,
  .footer__contact {
    grid-column: 1 / -1;
  }

  .footer__summary {
    max-width: 46ch;
  }

  .footer__contact {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem 1.5rem;
  }

  .footer__contact .footer__title {
    grid-column: 1 / -1;
    margin-bottom: 0;
  }

  .footer__note {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 95;
    display: block;
    max-height: 78vh;
    overflow-y: auto;
    padding: 1rem var(--ly-gutter) calc(1rem + env(safe-area-inset-bottom, 0px));
    background-color: var(--ly-navy);
    border-top: 1px solid var(--ly-hairline-strong);
    box-shadow: 0 -20px 44px rgba(3, 16, 28, 0.5);
    transform: translateY(105%);
    transition: transform 0.3s var(--ly-ease);
  }

  .masthead[data-open="true"] .nav {
    transform: translateY(0);
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__link {
    display: block;
    padding: 0.85rem 0.25rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(50, 242, 208, 0.1);
  }

  .nav__link::after {
    display: none;
  }

  .nav__link:hover {
    background-color: var(--ly-mint-wash);
  }

  .nav__link[aria-current="page"] {
    padding-left: 0.75rem;
    border-left: 2px solid var(--ly-mint);
  }

  .nav__item--cta {
    margin: 1rem 0 0;
  }

  .nav__cta {
    display: block;
    padding: 0.9rem 1rem;
    text-align: center;
    font-size: 0.92rem;
  }

  body.is-nav-open {
    overflow: hidden;
  }

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .masthead__status {
    font-size: 0.62rem;
  }

  .masthead__stamp {
    display: none;
  }

  .brand__mark {
    width: 34px;
    height: 34px;
    font-size: 0.62rem;
  }

  .brand__name {
    font-size: 1.04rem;
  }

  .brand__tag {
    font-size: 0.55rem;
    letter-spacing: 0.24em;
    text-indent: 0.24em;
  }

  .footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.75rem 1.25rem;
  }

  .footer__brand,
  .footer__contact,
  .footer__contact .footer__title,
  .footer__note {
    grid-column: 1 / -1;
  }

  .footer__contact {
    display: flex;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 8. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}