/* ============================================================
   鸿鹄易学官网 · layout.css
   导航 / Hero / 各 section 布局 / CSS mockup / 响应式
   ============================================================ */

/* ================= 导航栏 ================= */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background-color 0.4s var(--ease-apple), box-shadow 0.4s var(--ease-apple),
    border-color 0.4s var(--ease-apple);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: rgba(10, 20, 60, 0.08);
}

.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.nav-brand img {
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a:not(.btn) {
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.nav-links a:not(.btn):hover {
  color: var(--text);
}

.nav-cta {
  padding: 10px 22px;
  font-size: 0.9rem;
}

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav-burger span {
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.35s var(--ease-apple), opacity 0.35s;
}

/* ================= Section 通用 ================= */
.section {
  position: relative;
  padding: clamp(80px, 12vw, 140px) 0;
  overflow: hidden;
}

.section-soft {
  background: var(--bg-soft);
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(44px, 6vw, 72px);
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head.center .section-sub,
.center-sub {
  margin-left: auto;
  margin-right: auto;
}

.section-title.on-dark {
  color: var(--text-on-dark);
}

.section-sub.on-dark-sub {
  color: var(--text-on-dark-secondary);
}

.container-narrow {
  max-width: 780px;
}

/* ================= Hero ================= */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + clamp(56px, 9vw, 110px)) 0 clamp(64px, 9vw, 120px);
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -30%;
  left: 50%;
  width: 1100px;
  height: 800px;
  transform: translateX(-50%);
  background:
    radial-gradient(closest-side, rgba(30, 111, 255, 0.16), transparent 70%),
    radial-gradient(closest-side at 70% 60%, rgba(125, 180, 255, 0.22), transparent 70%);
  filter: blur(10px);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(40px, 6vw, 80px);
}

.hero-inner > *,
.desktop-inner > * {
  min-width: 0;
}

/* Hero 大标题：统一字号 700，首行深色、后两行品牌蓝渐变（原版排版） */
.hero-title {
  margin-top: 22px;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.12;
}

.hero-sub {
  margin-top: 22px;
  font-size: clamp(1.02rem, 1.7vw, 1.22rem);
  line-height: 1.7;
  color: var(--text-secondary);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(28px, 4vw, 48px);
  margin-top: 46px;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-size: clamp(2.2rem, 4.2vw, 3.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  /* 固定行高盒（与数字同高），让三项的数字/文字与下方说明保持同一水平线 */
  line-height: clamp(2.55rem, 4.9vw, 3.6rem);
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 非数字项（如「自定义」）：文字比数字略小一档，保持层级 */
.hero-stats .stat-text strong {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  letter-spacing: 0.01em;
}

/* 标签行（仅 li 的直接子级 span，避免误伤 strong 内的数字 span） */
.hero-stats li > span:last-child {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ---------- Hero 浏览器 mockup ---------- */
.hero-visual {
  position: relative;
}

.browser-mockup {
  position: relative;
  max-width: 100%;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 6px 24px rgba(10, 20, 60, 0.1), 0 40px 90px rgba(10, 30, 90, 0.18);
  overflow: hidden;
  transform: perspective(1200px) rotateY(-6deg) rotateX(2deg);
  transition: transform 0.8s var(--ease-apple);
}

.hero-visual:hover .browser-mockup {
  transform: perspective(1200px) rotateY(-2deg) rotateX(0.5deg);
}

.bm-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: #F2F4F8;
  border-bottom: 1px solid rgba(10, 20, 60, 0.06);
}

.bm-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  flex: none;
}

.bm-url {
  margin-left: 10px;
  padding: 4px 14px;
  flex: 1;
  max-width: 260px;
  border-radius: 999px;
  background: #fff;
  font-size: 0.72rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bm-body {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 14px;
  padding: 16px;
}

.bm-video {
  position: relative;
  border-radius: 12px;
  background: linear-gradient(150deg, #101B3C, #1E3A8A 60%, #2E7DFF);
  min-height: 210px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.bm-play {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.bm-play svg {
  width: 24px;
  height: 24px;
  margin-left: 3px;
}

.bm-progress {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  height: 4px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.25);
  overflow: hidden;
}

.bm-progress i {
  display: block;
  height: 100%;
  width: 62%;
  border-radius: 4px;
  background: #fff;
  animation: bm-play 6s linear infinite;
}

@keyframes bm-play {
  0% { width: 8%; }
  100% { width: 96%; }
}

.bm-panel {
  border-radius: 12px;
  background: var(--bg-soft);
  border: 1px solid rgba(10, 20, 60, 0.06);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.72rem;
}

.bm-panel-head {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--brand);
}

.bm-panel-head img {
  border-radius: 4px;
}

.bm-q {
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
}

.bm-opt {
  padding: 6px 10px;
  border-radius: 8px;
  background: #fff;
  border: 1px solid rgba(10, 20, 60, 0.07);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.bm-opt.active {
  border-color: var(--brand);
  color: var(--brand);
  font-weight: 600;
  background: rgba(30, 111, 255, 0.06);
}

.bm-opt em {
  font-style: normal;
  font-size: 0.64rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--brand-grad);
  color: #fff;
  white-space: nowrap;
}

.bm-scan {
  height: 5px;
  border-radius: 5px;
  background: rgba(30, 111, 255, 0.12);
  overflow: hidden;
}

.bm-scan i {
  display: block;
  height: 100%;
  width: 40%;
  border-radius: 5px;
  background: var(--brand-grad);
  animation: bm-scan 1.8s var(--ease-apple) infinite;
}

@keyframes bm-scan {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(260%); }
}

.bm-foot {
  display: flex;
  justify-content: space-between;
  color: var(--text-secondary);
}

.bm-ok {
  color: #16A34A;
  font-weight: 700;
}

.hero-platforms-strip {
  margin-top: 26px;
  text-align: center;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

/* ================= 平台卡片 ================= */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-card {
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.platform-card strong {
  font-size: 1.06rem;
  letter-spacing: -0.01em;
}

.platform-card span {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.pf-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 12px;
  border-radius: 14px;
  font-style: normal;
  font-weight: 700;
  font-size: 1.15rem;
  color: #fff;
  background: linear-gradient(135deg, var(--pf, #1E6FFF), #7DB4FF);
  background: linear-gradient(135deg, var(--pf, #1E6FFF), color-mix(in srgb, var(--pf, #1E6FFF) 55%, #7DB4FF));
  box-shadow: 0 8px 18px rgba(10, 20, 60, 0.18);
}

/* ================= 功能矩阵 ================= */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  position: relative;
  padding: 30px 26px;
}

.feature-card h3 {
  margin-top: 18px;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.feature-card p {
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ================= 深色电影感区段 ================= */
.section-dark {
  background: linear-gradient(160deg, var(--dark-1) 0%, var(--dark-2) 100%);
  color: var(--text-on-dark);
}

.section-dark-2 {
  background: linear-gradient(200deg, var(--dark-2) 0%, #0B1430 100%);
}

.dark-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  width: 1200px;
  height: 700px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(46, 125, 255, 0.28), transparent 70%);
  pointer-events: none;
  animation: glow-breathe 8s ease-in-out infinite alternate;
}

.dark-glow-2 {
  top: auto;
  bottom: -30%;
  background: radial-gradient(closest-side, rgba(125, 180, 255, 0.18), transparent 70%);
}

@keyframes glow-breathe {
  0% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  100% { opacity: 1; transform: translateX(-50%) scale(1.12); }
}

/* ---------- v4.15.0 亮点 ---------- */
.whatsnew-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.wn-card {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius-card);
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform 0.45s var(--ease-apple), border-color 0.45s, background-color 0.45s;
}

.wn-card:hover {
  transform: translateY(-6px);
  border-color: rgba(125, 180, 255, 0.45);
  background: rgba(255, 255, 255, 0.09);
}

.wn-num {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.wn-card h3 {
  margin-top: 12px;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.wn-card p {
  margin-top: 8px;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-on-dark-secondary);
}

/* ================= 桌面版 ================= */
.desktop-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  align-items: center;
  gap: clamp(44px, 6vw, 80px);
}

.desktop-points {
  margin-top: 34px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.desktop-points li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.desktop-points svg {
  width: 20px;
  height: 20px;
  margin-top: 4px;
  color: var(--brand-sky);
  flex: none;
}

.desktop-points strong {
  display: block;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.desktop-points span {
  font-size: 0.88rem;
  color: var(--text-on-dark-secondary);
  line-height: 1.6;
}

/* ---------- 桌面应用 mockup ---------- */
.app-mockup {
  max-width: 100%;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--dark-border);
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.45);
  overflow: hidden;
  transform: perspective(1200px) rotateY(6deg) rotateX(2deg);
  transition: transform 0.8s var(--ease-apple);
}

.desktop-visual:hover .app-mockup {
  transform: perspective(1200px) rotateY(2deg) rotateX(0.5deg);
}

.am-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid var(--dark-border);
}

.am-title {
  margin-left: 10px;
  font-size: 0.75rem;
  color: var(--text-on-dark-secondary);
}

.am-body {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  min-height: 320px;
}

.am-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 18px 0;
  border-right: 1px solid var(--dark-border);
}

.am-side-item {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.08);
}

.am-side-item.active {
  background: var(--brand-grad);
  box-shadow: 0 4px 14px rgba(30, 111, 255, 0.5);
}

.am-main {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.am-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

.am-instance {
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--dark-border);
  font-size: 0.75rem;
  color: var(--text-on-dark);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.am-instance em {
  font-style: normal;
  width: 100%;
  color: var(--text-on-dark-secondary);
  font-size: 0.68rem;
}

.am-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.am-dot.ok {
  background: #34D399;
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.8);
}

.am-dot.run {
  background: #FBBF24;
  box-shadow: 0 0 8px rgba(251, 191, 36, 0.8);
  animation: dot-blink 1.4s ease-in-out infinite;
}

@keyframes dot-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.am-monitor {
  flex: 1;
  padding: 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--dark-border);
}

.am-mon-label {
  font-size: 0.7rem;
  color: var(--text-on-dark-secondary);
  letter-spacing: 0.1em;
}

.am-mon-grid {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.am-mon-grid i {
  aspect-ratio: 16 / 10;
  border-radius: 8px;
  background: linear-gradient(150deg, rgba(46, 125, 255, 0.35), rgba(125, 180, 255, 0.12));
  border: 1px solid rgba(125, 180, 255, 0.25);
  animation: mon-pulse 3s ease-in-out infinite;
}

.am-mon-grid i:nth-child(2) { animation-delay: 0.4s; }
.am-mon-grid i:nth-child(3) { animation-delay: 0.8s; }
.am-mon-grid i:nth-child(4) { animation-delay: 1.2s; }

@keyframes mon-pulse {
  0%, 100% { opacity: 0.65; }
  50% { opacity: 1; }
}

/* ================= 双端协同 ================= */
.synergy-flow {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: clamp(12px, 3vw, 28px);
}

.sy-node {
  flex: 1;
  max-width: 260px;
  padding: 34px 22px;
  border-radius: var(--radius-card);
  background: #fff;
  box-shadow: var(--shadow-md);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.sy-node .icon-bubble {
  margin-bottom: 12px;
}

.sy-node strong {
  font-size: 1.05rem;
}

.sy-node span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.sy-arrow {
  align-self: center;
  width: clamp(30px, 4vw, 48px);
  color: var(--brand);
  flex: none;
}

/* ================= 下载 ================= */
.download-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 920px;
  margin: 0 auto;
}

.dl-card {
  padding: 38px 32px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.dl-card h3 {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}

.dl-card p {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.dl-card .btn {
  margin-top: 6px;
}

.dl-manual {
  width: 100%;
  margin-top: 8px;
  border-top: 1px solid rgba(10, 20, 60, 0.08);
  padding-top: 14px;
  font-size: 0.88rem;
}

.dl-manual summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--brand);
  list-style: none;
}

.dl-manual summary::before {
  content: "+";
  display: inline-block;
  margin-right: 8px;
  transition: transform 0.3s var(--ease-apple);
}

.dl-manual[open] summary::before {
  transform: rotate(45deg);
}

.dl-manual ol {
  margin-top: 12px;
  padding-left: 20px;
  list-style: decimal;
  color: var(--text-secondary);
  line-height: 1.8;
}

.dl-manual code {
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(30, 111, 255, 0.08);
  color: var(--brand);
  font-size: 0.82em;
}

/* ================= FAQ ================= */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border-radius: 18px;
  background: #fff;
  border: 1px solid rgba(10, 20, 60, 0.07);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.4s var(--ease-apple);
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 26px;
  font-weight: 600;
  font-size: 1.02rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(30, 111, 255, 0.09);
  color: var(--brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 1.1rem;
  transition: transform 0.35s var(--ease-apple);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 26px 22px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ================= Footer ================= */
.footer {
  border-top: 1px solid rgba(10, 20, 60, 0.08);
  padding: 56px 0 48px;
  background: var(--bg-soft);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 26px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
}

.footer-brand img {
  border-radius: 10px;
}

.footer-brand strong {
  display: block;
  font-size: 1.1rem;
}

.footer-brand span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}

.footer-links a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--brand);
}

.footer-legal {
  font-size: 0.8rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.footer-legal a {
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(10, 20, 60, 0.18);
  transition: color 0.3s, border-color 0.3s;
}

.footer-legal a:hover {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

/* ---------- 下载卡次级链接 ---------- */
.dl-alts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.dl-alt {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.dl-alt:hover {
  color: var(--brand);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1279px) {
  .platform-grid,
  .feature-grid,
  .whatsnew-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero-inner,
  .desktop-inner {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-cta,
  .hero-stats {
    justify-content: center;
  }

  .desktop-copy {
    order: 1;
  }

  .desktop-visual {
    order: 2;
  }

  .browser-mockup,
  .app-mockup {
    transform: none;
  }

  .synergy-flow {
    flex-direction: column;
    align-items: center;
  }

  .sy-arrow {
    transform: rotate(90deg);
  }

  .sy-node {
    width: 100%;
  }

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

@media (max-width: 767px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px 24px 24px;
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(10, 20, 60, 0.08);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.45s var(--ease-apple), opacity 0.45s;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a:not(.btn) {
    padding: 12px 4px;
    font-size: 1rem;
  }

  .nav-cta {
    margin-top: 8px;
  }

  .nav-burger {
    display: flex;
  }

  .nav-burger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-burger.open span:nth-child(2) {
    opacity: 0;
  }

  .nav-burger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .platform-grid {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    margin: 0 -24px;
    padding: 4px 24px 20px;
    -webkit-overflow-scrolling: touch;
  }

  .platform-card {
    flex: 0 0 76%;
    scroll-snap-align: center;
  }

  .feature-grid,
  .whatsnew-grid {
    grid-template-columns: 1fr;
  }

  .bm-body {
    grid-template-columns: 1fr;
  }

  .bm-video {
    min-height: 160px;
  }

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