body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  color: #111;
  background: #fff;
  overflow-x: hidden;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
}

p {
  color: #555;
  line-height: 1.6;
}

section {
  padding: 120px 8%;
  position: relative;
  max-width: 1600px;
  margin: 0 auto;
}

section.fiuld {
  max-width: none;
}

header {
  background-color: #171717;
  padding: 11px;
}

header nav {
  display: none;
  flex-direction: column;
  color: white;
  gap: 1.5rem;
  margin: 1.5rem 0px;
}

header nav a {
  font-size: 1.125rem;
  font-weight: 600;
  text-align: center;
}

header h4 {
  margin: unset;
}

header.mobile:has(input[type="checkbox"]:checked) nav {
  display: flex;
}

details > summary {
  list-style: none;
  cursor: pointer;
}

details > summary::-webkit-details-marker {
  display: none;
}

.header-inner {
  max-width: 1600px;
  margin: 0 auto;
  color: white;
  display: flex;
  gap: 2rem;
  align-items: center;
  font-size: 1.05rem;
}

.header-inner a,
header.mobile nav a {
  color: white;
  text-decoration: none;
}

.header-inner a:hover,
header.mobile nav a:hover {
  opacity: 0.8;
}

.header-menu {
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  height: 40px;
}

/* 动画 */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: all 1s ease-out;
}

.fade-up.show {
  opacity: 1;
  transform: translateY(0);
}

.animate-title {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 1.2s ease, transform 1.2s ease;
}

.animate-title.show {
  opacity: 1;
  transform: translateY(0);
}

.animate-stagger > * {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.animate-stagger.show > *:nth-child(1) {
  transition-delay: 0.1s;
}

.animate-stagger.show > *:nth-child(2) {
  transition-delay: 0.2s;
}

.animate-stagger.show > *:nth-child(3) {
  transition-delay: 0.3s;
}

.animate-stagger.show > *:nth-child(4) {
  transition-delay: 0.4s;
}

.animate-stagger.show > *:nth-child(5) {
  transition-delay: 0.5s;
}

.animate-stagger.show > *:nth-child(6) {
  transition-delay: 0.6s;
}

.animate-stagger.show > * {
  opacity: 1;
  transform: translateY(0);
}

/* HERO - 调整为刚好一屏（100vh 但内容垂直居中不拉太高） */
.hero {
  position: relative;
  height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: 4vh;
  align-items: center;
  text-align: center;
  color: #fff;
  overflow: hidden;
}

.hero-video-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
  z-index: -2;
}

.hero-fallback-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("./images/lp_banner.webp");
  background-size: cover;
  background-position: center;
  z-index: -3;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #000;
  opacity: 0;
  /* 遮罩已关闭 */
  z-index: -4;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    to bottom,
    transparent 50%,
    rgba(0, 0, 0, 0.5) 100%
  );
  z-index: 1;
  pointer-events: none;
}

.hero h1 {
  font-size: 78px;
  letter-spacing: -1.5px;
  margin-bottom: 8px;
  position: relative;
  z-index: 2;
}

.hero p {
  font-size: 36px;
  max-width: 900px;
  opacity: 0.95;
  color: #fff;
  margin-top: -10px;
  position: relative;
  z-index: 2;
}

.hero-tesla {
  font-size: 2em;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.hero-action-wrapper {
  width: 100%;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: -40px;
  position: relative;
  z-index: 2;
}

.hero-kickstarter {
  width: 70%;
  max-width: 800px;
  display: block;
}

.hero-form-wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
}

.hero-form {
  position: relative;
  width: 700px;
  max-width: 90%;
  padding: 10px 0;
  z-index: 9999;
}
.form-success {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 0;
  margin-top: -15px;
}

.form-success-logo {
  height: 50px;
}

.form-success-btn {
  display: inline-block;
  background: #1a73e8;
  color: #fff;
  padding: 18px 56px;
  border-radius: 8px;
  font-size: 22px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.3s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.form-success-btn:hover {
  background: #1557b0;
}

/* Highlight Overview - 大卡片叠加文字 */
.highlight-title {
  text-align: center;
  font-size: 56px;
  color: #111;
  margin-bottom: 60px;
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 40px;
}

.highlight-card {
  position: relative;
  aspect-ratio: 380/500;
  /* 保持一致的宽高比 */
  border-radius: 40px;
  overflow: hidden;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  transition: transform 0.6s ease, box-shadow 0.6s ease;
  background-color: #555;
}

.highlight-card:hover {
  transform: translateY(-15px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.highlight-card-img {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
}

.highlight-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 60px 40px 40px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
  color: #fff;
}

.highlight-card h3 {
  font-size: 32px;
  margin-bottom: 16px;
  font-weight: 800;
  line-height: 1.2;
}

.highlight-card p {
  font-size: 18px;
  opacity: 0.95;
  line-height: 1.6;
  color: #fff;
  /* 明确设置为白色 */
}

/* 通用图片占位 */
.img-placeholder {
  position: relative;
  background-color: #555;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 32px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  transition: transform 0.6s ease;
  aspect-ratio: 1/1;
  /* 保持正方形比例 */
  overflow: hidden;
}

.img-placeholder p {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0;
  padding: 20px;
  color: #fff;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  border-radius: 0 0 32px 32px;
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  opacity: 0.95;
}

.img-placeholder:hover {
  transform: scale(1.05);
}

/* 视频背景 */
.bg-video {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
  z-index: -1;
}

/* 横向网格 */
.horizontal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: 40px;
  margin-top: 80px;
}

/* 左右交替 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(500px, 1fr));
  gap: 80px;
  align-items: center;
  margin-top: 80px;
}

.feature-grid:nth-child(2n + 1) .feature-video {
  order: 1;
}

.feature-grid.reverse {
  direction: rtl;
}

.feature-grid.reverse > * {
  direction: ltr;
}

.feature-img {
  aspect-ratio: 500/480;
  /* 保持一致的宽高比 */
}

.feature-video {
  aspect-ratio: 16 / 9;
}

.feature-video video {
  width: 100%;
}

.feature-text h3 {
  font-size: 42px;
  margin-bottom: 24px;
  color: #111;
}

.feature-text p {
  font-size: 24px;
  color: #222;
}

/* 大单图 & 占位 */
.large-img {
  aspect-ratio: 1600/560;
  /* 保持一致的宽高比 */
  margin-top: 80px;
}

.spec-placeholder {
  aspect-ratio: 1600/560;
  /* 保持一致的宽高比 */
  margin-top: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #999;
}

/* 标题 */
.section-title {
  text-align: center;
  font-size: 52px;
  color: #111;
  margin-bottom: 100px;
}

/* CTA */
.cta {
  text-align: center;
  padding: 160px 10%;
  background: linear-gradient(135deg, #00d2ff, #3a7bd5);
  color: #fff;
}

.cta h2 {
  font-size: 60px;
  margin-bottom: 32px;
}

.cta p {
  font-size: 26px;
  margin-bottom: 70px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  color: #fff;
  font-weight: 600;
  opacity: 0.95;
}

.cta button {
  padding: 24px 80px;
  font-size: 26px;
  font-weight: 700;
  border: none;
  border-radius: 50px;
  background: #fff;
  color: #000;
  cursor: pointer;
  transition: all 0.4s ease;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.cta button:hover {
  transform: scale(1.08);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

/* Image Comparison Slider */
.compare-section {
  background: #f0f0f0;
  padding: 80px 0;
}

.compare-layout {
  max-width: 1600px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  align-items: center;
  gap: 60px;
  padding: 0 8%;
}

.compare-text {
  color: #111;
  text-align: center;
}

.compare-logo {
  width: 100px;
  margin-bottom: 24px;
}

.compare-text h2 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  color: #111;
}
.compare-subtitle {
  font-size: 16px;
  color: #555;
  margin-top: 12px;
  font-weight: 400;
}


.compare-slider {
  width: 100%;
}

.compare-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  cursor: ew-resize;
  user-select: none;
  -webkit-user-select: none;
}

.compare-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
}

.compare-img-right {
  z-index: 1;
}

.compare-img-left-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  z-index: 2;
}

.compare-img-left-wrapper .compare-img-left {
  position: absolute;
  top: 0;
  left: 0;
  width: auto;
  min-width: 0;
  height: 100%;
}

.compare-handle {
  position: absolute;
  top: 0;
  left: 50%;
  width: 4px;
  height: 100%;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translateX(-50%);
  pointer-events: none;
}

.compare-handle-line {
  flex: 1;
  width: 3px;
  background: #fff;
  box-shadow: 0 0 6px rgba(0,0,0,0.4);
}

.compare-handle-circle {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(0,0,0,0.6);
  border: 3px solid #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #fff;
  font-size: 18px;
  font-weight: bold;
  box-shadow: 0 2px 10px rgba(0,0,0,0.4);
  pointer-events: auto;
  cursor: ew-resize;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .compare-layout {
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 0 5%;
  }
  .compare-text h2 {
    font-size: 32px;
  }
  .compare-logo {
    display: none;
  }
  .compare-text {
    padding: 0;
  }
}


.w-full {
  width: 100%;
}

.overview-desktop {
  max-width: 70%;
  margin: 0 auto;
  display: block;
}
.traditional-img {
  max-width: 40%;
  display: block;
  margin: 0 auto;
}

.overview-mobile {
  max-width: 100%;
  margin: 0 auto;
}
.choose-img {
  max-width: 60%;
  display: block;
  margin: 0 auto;
}

.mobile {
  display: none;
}

.faq-list {
  display: flex;
  flex-direction: column;
  padding: 4rem;
  border: 1px solid #eee;
}

.faq-item {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid #eee;
  padding: 2rem 0px;
}

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

.faq-title {
  font-size: 1.875rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
}

.faq-title img {
  transition: transform 0.2s ease-in-out;
}

.faq-content {
  font-size: 1.25rem;
  display: flex;
  justify-content: space-between;
  margin-top: 1rem;
}

/* 响应式设计 - 等比例缩小效果 */
@media (max-width: 1200px) {
  /* 1.2倍缩放 */
  section {
    padding: 100px 6.67%;
  }

  .hero h1 {
    font-size: 65px;
  }

  .hero p {
    font-size: 23.33px;
  }

  .highlight-title,
  .section-title {
    font-size: 46.67px;
    margin-bottom: 30px;
  }

  .highlight-grid,
  .horizontal-grid {
    grid-template-columns: repeat(auto-fit, minmax(316.67px, 1fr));
    gap: 33.33px;
  }

  .highlight-card {
    border-radius: 33.33px;
  }

  .highlight-card-overlay {
    padding: 50px 33.33px 33.33px;
  }

  .highlight-card h3 {
    font-size: 26.67px;
    margin-bottom: 13.33px;
  }

  .highlight-card p {
    font-size: 15px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(416.67px, 1fr));
    gap: 66.67px;
    margin-top: 66.67px;
  }

  .feature-text h3 {
    font-size: 30px;
    margin-bottom: 20px;
  }

  .feature-text p {
    font-size: 16.67px;
  }

  .large-img,
  .spec-placeholder {
    margin-top: 66.67px;
  }

  .spec-placeholder {
    font-size: 25px;
  }

  .cta {
    padding: 133.33px 8.33%;
  }

  .cta h2 {
    font-size: 50px;
    margin-bottom: 26.67px;
  }

  .cta p {
    font-size: 21.67px;
    margin-bottom: 58.33px;
  }

  .cta button {
    padding: 20px 66.67px;
    font-size: 21.67px;
    border-radius: 41.67px;
  }

  .img-placeholder p {
    padding: 16.67px;
    font-size: 13.33px;
  }
}

@media (max-width: 992px) {
  /* 1.4倍缩放 */
  section {
    padding: 85.71px 5.71%;
  }

  .hero h1 {
    font-size: 55.71px;
  }

  .hero p {
    font-size: 20px;
  }

  .highlight-title,
  .section-title {
    font-size: 40px;
    margin-bottom: 25px;
  }

  .highlight-grid,
  .horizontal-grid {
    grid-template-columns: repeat(auto-fit, minmax(271.43px, 1fr));
    gap: 28.57px;
  }

  .highlight-card {
    border-radius: 28.57px;
  }

  .highlight-card-overlay {
    padding: 42.86px 28.57px 28.57px;
  }

  .highlight-card h3 {
    font-size: 22.86px;
    margin-bottom: 11.43px;
  }

  .highlight-card p {
    font-size: 12.86px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(357.14px, 1fr));
    gap: 57.14px;
    margin-top: 57.14px;
  }

  .feature-text h3 {
    font-size: 32px;
    margin-bottom: 17.14px;
  }

  .feature-text p {
    font-size: 18px;
  }

  .large-img,
  .spec-placeholder {
    margin-top: 57.14px;
  }

  .spec-placeholder {
    font-size: 21.43px;
  }

  .cta {
    padding: 114.29px 5.71%;
  }

  .cta h2 {
    font-size: 42.86px;
    margin-bottom: 22.86px;
  }

  .cta p {
    font-size: 18.57px;
    margin-bottom: 50px;
  }

  .cta button {
    padding: 17.14px 57.14px;
    font-size: 18.57px;
    border-radius: 35.71px;
  }

  .img-placeholder p {
    padding: 14.29px;
    font-size: 11.43px;
  }
}

@media (max-width: 768px) {
  /* 1.8倍缩放 */
  .traditional-img,
  .choose-img {
    max-width: 100%;
  }

  section {
    padding: 66.67px 4.44%;
  }

  .hero h1 {
    font-size: 43.33px;
  }

  .hero p {
    font-size: 20px;
  }

  .highlight-title,
  .section-title {
    font-size: 31.11px;
    margin-bottom: 20px;
  }

  .highlight-grid,
  .horizontal-grid {
    grid-template-columns: repeat(auto-fit, minmax(211.11px, 1fr));
    gap: 22.22px;
  }

  .highlight-card {
    border-radius: 22.22px;
  }

  .highlight-card-overlay {
    padding: 33.33px 22.22px 22.22px;
  }

  .highlight-card h3 {
    font-size: 17.78px;
    margin-bottom: 8.89px;
  }

  .highlight-card p {
    font-size: 10px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(277.78px, 1fr));
    gap: 44.44px;
    margin-top: 44.44px;
  }

  .feature-grid:nth-child(2n + 1) .feature-video {
    order: 1;
  }

  .feature-text h3 {
    font-size: 20px;
    margin-bottom: 13.33px;
  }

  .feature-text p {
    font-size: 11.11px;
  }

  .large-img,
  .spec-placeholder {
    margin-top: 44.44px;
  }

  .spec-placeholder {
    font-size: 16.67px;
  }

  .cta {
    padding: 88.89px 4.44%;
  }

  .cta h2 {
    font-size: 33.33px;
    margin-bottom: 17.78px;
  }

  .cta p {
    font-size: 14.44px;
    margin-bottom: 38.89px;
  }

  .cta button {
    padding: 13.33px 44.44px;
    font-size: 14.44px;
    border-radius: 27.78px;
  }

  .img-placeholder p {
    padding: 11.11px;
    font-size: 8.89px;
  }

  .faq-list {
    padding: 1rem;
  }

  .faq-title {
    font-size: 1.25rem;
  }

  .desktop {
    display: none;
  }

  .mobile {
    display: block;
  }

  .header-wordmark {
    display: none;
  }

  .hero {
    overflow: hidden;
  }

  .hero-form {
    width: 100%;
    max-width: 100%;
    padding: 20px 5%;
    box-sizing: border-box;
  }
}

@media (max-width: 576px) {
  /* 2.2倍缩放 */
  section {
    padding: 54.55px 3.64%;
  }

  .hero h1 {
    font-size: 35.45px;
  }

  .hero p {
    font-size: 18px;
  }

  .highlight-title,
  .section-title {
    font-size: 25.45px;
    margin-bottom: 15px;
  }

  .highlight-grid,
  .horizontal-grid {
    grid-template-columns: repeat(auto-fit, minmax(172.73px, 1fr));
    gap: 18.18px;
  }

  .highlight-card {
    border-radius: 18.18px;
  }

  .highlight-card-overlay {
    padding: 27.27px 18.18px 18.18px;
  }

  .highlight-card h3 {
    font-size: 14.55px;
    margin-bottom: 7.27px;
  }

  .highlight-card p {
    font-size: 8.18px;
  }

  .feature-grid {
    grid-template-columns: repeat(auto-fit, minmax(227.27px, 1fr));
    gap: 36.36px;
    margin-top: 36.36px;
  }

  .feature-grid:nth-child(2n + 1) .feature-text {
    order: 1;
  }

  .feature-text h3 {
    font-size: 24px;
    margin-bottom: 10.91px;
  }

  .feature-text p {
    font-size: 16px;
  }

  .large-img,
  .spec-placeholder {
    margin-top: 36.36px;
  }

  .spec-placeholder {
    font-size: 13.64px;
  }

  .cta {
    padding: 72.73px 3.64%;
  }

  .cta h2 {
    font-size: 27.27px;
    margin-bottom: 14.55px;
  }

  .cta p {
    font-size: 11.82px;
    margin-bottom: 31.82px;
  }

  .cta button {
    padding: 10.91px 36.36px;
    font-size: 11.82px;
    border-radius: 22.73px;
  }

  .img-placeholder p {
    padding: 9.09px;
    font-size: 7.27px;
  }
}

@media (max-width: 445px) {
  /* 2.2倍缩放 */
  section {
    padding: 54.55px 3.64%;
  }

  .hero h1 {
    font-size: 35.45px;
  }

  .hero p {
    font-size: 18px;
  }

  .highlight-title,
  .section-title {
    font-size: 25.45px;
    margin-bottom: 15px;
  }

  .highlight-grid,
  .horizontal-grid {
    grid-template-columns: repeat(auto-fit, minmax(172.73px, 1fr));
    gap: 18.18px;
  }

  .highlight-card {
    border-radius: 18.18px;
  }

  .highlight-card-overlay {
    padding: 27.27px 18.18px 18.18px;
  }

  .highlight-card h3 {
    font-size: 14.55px;
    margin-bottom: 7.27px;
  }

  .highlight-card p {
    font-size: 8.18px;
  }

  .feature-grid {
    grid-template-columns: repeat(auto-fit, minmax(227.27px, 1fr));
    gap: 36.36px;
    margin-top: 36.36px;
  }

  .feature-grid:nth-child(2n + 1) .feature-text {
    order: 1;
  }

  .feature-text h3 {
    font-size: 24px;
    margin-bottom: 10.91px;
  }

  .feature-text p {
    font-size: 16px;
  }

  .large-img,
  .spec-placeholder {
    margin-top: 36.36px;
  }

  .spec-placeholder {
    font-size: 13.64px;
  }

  .cta {
    padding: 72.73px 3.64%;
  }

  .cta h2 {
    font-size: 27.27px;
    margin-bottom: 14.55px;
  }

  .cta p {
    font-size: 11.82px;
    margin-bottom: 31.82px;
  }

  .cta button {
    padding: 10.91px 36.36px;
    font-size: 11.82px;
    border-radius: 22.73px;
  }

  .img-placeholder p {
    padding: 9.09px;
    font-size: 7.27px;
  }
}

/* Floating Sign Up Button */
.floating-signup {
  position: fixed;
  top: 20px;
  right: 20px;
  background: #1a73e8;
  color: #fff;
  padding: 17px 39px;
  border-radius: 7px;
  font-size: 20px;
  font-weight: 600;
  text-decoration: none;
  z-index: 99999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-20px);
  transition: opacity 0.3s, transform 0.3s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.floating-signup.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.floating-signup:hover {
  background: #1557b0;
}

/* Mobile floating signup - smaller */
@media (max-width: 768px) {
  .floating-signup {
    padding: 10px 22px;
    border-radius: 5px;
    font-size: 14px;
  }
}

/* ===== Top Promo Banner ===== */
.promo-banner {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 999999;
}

.promo-banner p {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: #222;
  line-height: 1.3;
}

.promo-btn {
  display: inline-block;
  background: #1a73e8;
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.3s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.promo-btn:hover {
  background: #1557b0;
}

.promo-close {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 22px;
  color: #999;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

.promo-close:hover {
  color: #333;
}

.promo-banner.hidden {
  display: none;
}

@media (max-width: 768px) {
  .promo-banner {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 40px 10px 12px;
  }
  .promo-banner p {
    font-size: 13px;
    flex: 1 1 100%;
    text-align: center;
  }
  .promo-btn {
    font-size: 13px;
    padding: 8px 18px;
    margin: 0 auto;
  }
}

/* ===== White Promo Strip ===== */
.promo-strip {
  width: 100%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 20px;
  box-sizing: border-box;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 99998;
}

.promo-strip p {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: #222;
  line-height: 1.3;
}

.promo-strip-btn {
  position: absolute;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  flex-shrink: 0;
  background: #1a73e8;
  color: #fff;
  padding: 12px 30px;
  border-radius: 9px;
  font-size: 21px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.3s;
  cursor: pointer;
}

.promo-strip-btn:hover {
  background: #1557b0;
}

@media (max-width: 768px) {
  .promo-strip {
    padding: 8px 80px 8px 12px;
  }
  .promo-strip p {
    font-size: 12px;
    text-align: center;
  }
  .promo-strip-btn {
    right: 12px;
    font-size: 12px;
    padding: 6px 14px;
  }
}

/* Compatibility section - mobile full-width */
@media (max-width: 768px) {
  .compat-section {
    padding: 20px 0 !important;
    max-width: 100% !important;
    margin: 0 !important;
  }
  .compat-section img.mobile {
    display: block !important;
    width: 100% !important;
  }
}

/* Mobile feature-grid spacing */
@media (max-width: 768px) {
  .feature-grid {
    margin-top: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
  }
  .feature-grid:last-child {
    border-bottom: none;
  }
}

/* Mobile header logo smaller and centered */
@media (max-width: 768px) {
  .header-menu .header-logo {
    height: 28px;
  }
  .header-menu {
    justify-content: center;
    position: relative;
  }
  .header-menu label {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
  }
}

/* Timeline section - mobile full width */
@media (max-width: 768px) {
  .timeline-section {
    padding-left: 12px;
    padding-right: 12px;
  }
  .timeline-section .timeline-img {
    max-width: 100% !important;
    width: 100%;
  }
}
/* Hero action - mobile */
@media (max-width: 768px) {
  .hero-action-wrapper {
    margin-top: -60px;
  }
  .hero-kickstarter {
    width: 100%;
    max-width: 100%;
  }
  .hero-form {
    width: 100%;
    max-width: 100%;
    padding: 5px 16px;
  }
  .form-success {
    padding: 10px 0;
    gap: 10px;
  }
  .form-success-btn {
    padding: 12px 36px;
    font-size: 16px;
  }

/* Video section - mobile full width */
@media (max-width: 768px) {
  .video-section .video-wrapper {
    max-width: 100% !important;
  }
}

/* Community description - mobile */
@media (max-width: 768px) {
  .community-subtitle {
    font-size: 18px !important;
    margin-bottom: 5px !important;
  }
  .community-desc {
    font-size: 16px !important;
    margin-bottom: 30px !important;
  }
  .community-img {
    max-width: 100% !important;
  }
  .integration-img {
    max-width: 100% !important;
  }
  .integration-desc {
    font-size: 16px !important;
    margin-top: 0 !important;
  }
}
}

/* Compact section spacing */
.compact-section {
  padding-top: 60px !important;
  padding-bottom: 60px !important;
}

/* Spec Tabs */
.spec-tabs-section {
  padding-top: 60px;
  padding-bottom: 60px;
  background: #f5f5f5;
}

.spec-tabs {
  display: flex;
  border-bottom: 2px solid #e0e0e0;
  margin-bottom: 0;
  gap: 0;
}

.spec-tab {
  flex: 1;
  padding: 14px 20px;
  background: #f5f5f5;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: #666;
  transition: all 0.3s ease;
  text-align: center;
}

.spec-tab:hover {
  color: #333;
  background: #eee;
}

.spec-tab.active {
  background: #4CAF50;
  color: #fff;
  border-bottom: 3px solid #388E3C;
}

.spec-tab-content {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-top: none;
  min-height: 300px;
}

.spec-panel {
  display: none;
  padding: 30px;
}

.spec-panel.active {
  display: block;
}

.spec-panel img {
  max-width: 100%;
  display: block;
  margin: 0 auto;
}

@media (min-width: 769px) {
  .spec-img,
  .inbox-img,
  .shipping-img,
  .warranty-img {
    max-width: 50% !important;
  }
}
.spec-text-panel h3 {
  font-size: 24px;
  margin-bottom: 20px;
  color: #222;
}

.spec-text-panel ul {
  list-style: disc;
  padding-left: 24px;
}

.spec-text-panel li {
  font-size: 16px;
  line-height: 1.8;
  color: #444;
  margin-bottom: 8px;
}

@media (max-width: 768px) {
  .spec-tabs {
    flex-wrap: wrap;
  }
  .spec-tab {
    flex: 1 1 50%;
    font-size: 13px;
    padding: 10px 8px;
  }
  .spec-panel {
    padding: 16px;
  }
  .spec-text-panel h3 {
    font-size: 20px;
  }
  .spec-text-panel li {
    font-size: 14px;
  }
}

.faq-section {
  background: #f5f5f5;
}
.faq-section .section-title {
  margin-bottom: 30px;
}
}

@media (max-width: 768px) {
  .launching-text {
    font-size: 20px !important;
  }
}
}