:root {
    --bg-page: #09090c;
    --bg-card: #14141b;
    --amber: #ffb627;
    --text-main: #f6f3ed;
    --text-sub: #a19eaa;
    --radius-card: 12px;
    --container-width: 1180px;
  }

  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    background-color: var(--bg-page);
    color: var(--text-main);
    font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    padding-bottom: 58px; /* For mobile bottom bar */
  }

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

  img {
    display: block;
    max-width: 100%;
    object-fit: cover;
  }

  .container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
  }

  /* Typography */
  h1, h2, h3 {
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1.15;
  }

  .text-amber { color: var(--amber); }
  .text-sub { color: var(--text-sub); }

  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--amber);
    color: #09090c;
    font-weight: 800;
    border-radius: 8px;
    padding: 14px 24px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, background-color 0.2s ease;
  }
  .btn:hover {
    transform: translateY(-2px);
    background-color: #ffc853;
  }
  .btn-outline {
    background-color: transparent;
    color: var(--amber);
    border: 1px solid var(--amber);
  }
  .btn-outline:hover {
    background-color: rgba(255, 182, 39, 0.1);
  }
  .btn-dark {
    background-color: #09090c;
    color: var(--amber);
  }
  .btn-dark:hover {
    background-color: #1a1a24;
  }

  /* Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(9, 9, 12, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 100;
    height: 64px;
    display: flex;
    align-items: center;
  }
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }
  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .brand img {
    height: 32px;
    width: auto;
    border-radius: 6px;
  }
  .brand-name {
    font-weight: 900;
    font-size: 18px;
  }
  .app-badge {
    font-size: 10px;
    border: 1px solid var(--text-sub);
    padding: 1px 4px;
    border-radius: 4px;
    color: var(--text-sub);
  }
  .nav-links {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--text-sub);
  }
  .nav-links a:hover {
    color: var(--text-main);
  }
  .header-right {
    display: flex;
    align-items: center;
    gap: 16px;
  }
  .status-badge {
    font-size: 12px;
    color: var(--amber);
    display: flex;
    align-items: center;
    gap: 4px;
  }
  .status-badge::before {
    content: "";
    display: block;
    width: 6px;
    height: 6px;
    background-color: var(--amber);
    border-radius: 50%;
  }
  .header-btn {
    padding: 8px 16px;
    font-size: 14px;
  }

  /* Sections Common */
  section {
    padding: 80px 0;
    scroll-margin-top: 72px;
  }
  .section-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 800;
    color: var(--amber);
    letter-spacing: 0.1em;
    margin-bottom: 16px;
    text-transform: uppercase;
  }
  .section-title {
    font-size: 36px;
    margin-bottom: 16px;
  }
  .section-desc {
    font-size: 16px;
    color: var(--text-sub);
    max-width: 600px;
    margin-bottom: 48px;
  }

  /* Hero Section */
  .hero-section {
    padding-top: 140px;
    padding-bottom: 60px;
  }
  .hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
  }
  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }
  .hero-labels {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
  }
  .hero-label {
    font-size: 12px;
    background-color: rgba(255, 182, 39, 0.1);
    color: var(--amber);
    padding: 4px 10px;
    border-radius: 100px;
    font-weight: 600;
  }
  .hero-title {
    font-size: 52px;
    margin-bottom: 24px;
  }
  .hero-subtitle {
    font-size: 18px;
    color: var(--text-sub);
    margin-bottom: 32px;
    max-width: 480px;
  }
  .hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    width: 100%;
  }
  .hero-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 12px 24px;
    align-items: flex-start;
  }
  .hero-btn-title {
    font-size: 16px;
    font-weight: 900;
    margin-bottom: 2px;
  }
  .hero-btn-sub {
    font-size: 12px;
    opacity: 0.8;
  }
  .hero-links {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    font-size: 14px;
  }
  .hero-links a {
    color: var(--text-sub);
    text-decoration: underline;
    text-underline-offset: 4px;
  }
  .hero-links a:hover {
    color: var(--text-main);
  }
  .hero-trust {
    font-size: 13px;
    color: var(--text-sub);
    margin-bottom: 12px;
  }
  .hero-social {
    font-size: 13px;
    color: var(--text-sub);
  }

  /* Hero Visual */
  .hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .phone-mockup {
    width: 280px;
    height: 606px;
    background-color: #000;
    border-radius: 40px;
    padding: 10px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 0 2px #333;
    transform: rotate(3deg);
    position: relative;
    z-index: 2;
  }
  .phone-mockup img {
    width: 100%;
    height: 100%;
    border-radius: 30px;
    object-fit: cover;
  }
  .orbit-bg {
    position: absolute;
    width: 120%;
    height: 120%;
    border: 1px dashed rgba(255, 182, 39, 0.2);
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
  }
  .float-tag {
    position: absolute;
    background-color: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    z-index: 3;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .float-tag-1 { top: 10%; right: 0; }
  .float-tag-2 { bottom: 30%; left: -20px; }
  .float-tag-3 { bottom: 10%; right: -10px; }
  .float-tag::before {
    content: "";
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--amber);
  }

  /* Hero Stats */
  .hero-stats {
    display: flex;
    justify-content: space-between;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  .stat-item {
    display: flex;
    flex-direction: column;
  }
  .stat-value {
    font-size: 32px;
    font-weight: 900;
    color: var(--amber);
  }
  .stat-label {
    font-size: 14px;
    color: var(--text-sub);
    margin-top: 4px;
  }

  /* Why Download Section */
  .grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .feature-card {
    background-color: var(--bg-card);
    padding: 32px 24px;
    border-radius: var(--radius-card);
    display: flex;
    flex-direction: column;
    position: relative;
  }
  .feature-card.active {
    background-color: var(--amber);
    color: #09090c;
  }
  .feature-card.active .feature-desc { color: rgba(9,9,12,0.8); }
  .feature-card.active .feature-tag { background-color: #09090c; color: var(--amber); }
  .feature-title {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 800;
  }
  .feature-desc {
    font-size: 14px;
    color: var(--text-sub);
    margin-bottom: 24px;
    flex: 1;
  }
  .feature-tag {
    font-size: 12px;
    background-color: rgba(255,255,255,0.05);
    padding: 4px 10px;
    border-radius: 4px;
    align-self: flex-start;
    color: var(--text-sub);
  }

  /* Interface Section */
  .interface-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
  }
  .interface-item {
    text-align: center;
  }
  .interface-phone {
    background-color: var(--bg-card);
    border-radius: 24px;
    padding: 12px;
    margin-bottom: 20px;
    aspect-ratio: 9 / 16;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  }
  .interface-phone img {
    width: 100%;
    height: 100%;
    border-radius: 16px;
  }
  .interface-title {
    font-size: 18px;
    margin-bottom: 8px;
  }
  .interface-desc {
    font-size: 14px;
    color: var(--text-sub);
  }
  .interface-footer {
    text-align: center;
    font-size: 13px;
    color: var(--text-sub);
    margin-top: 48px;
  }

  /* Library Section */
  .poster-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
  }
  .poster-item {
    display: block;
    border-radius: var(--radius-card);
    overflow: hidden;
    background-color: var(--bg-card);
    transition: transform 0.3s ease;
    position: relative;
  }
  .poster-item:hover {
    transform: translateY(-4px);
  }
  .poster-img-box {
    aspect-ratio: 3 / 4;
    position: relative;
  }
  .poster-img-box img {
    width: 100%;
    height: 100%;
  }
  .poster-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: var(--amber);
    color: #09090c;
    font-size: 12px;
    font-weight: 800;
    padding: 4px 8px;
    border-radius: 4px;
  }
  .poster-hover {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--amber);
    font-weight: 800;
    opacity: 0;
    transition: opacity 0.3s ease;
  }
  .poster-item:hover .poster-hover {
    opacity: 1;
  }
  .poster-info {
    padding: 16px;
  }
  .poster-title {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .poster-meta {
    font-size: 12px;
    color: var(--text-sub);
  }
  
  .still-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .still-item {
    display: block;
    border-radius: var(--radius-card);
    overflow: hidden;
    background-color: var(--bg-card);
    position: relative;
  }
  .still-img-box {
    aspect-ratio: 16 / 9;
  }
  .still-img-box img {
    width: 100%;
    height: 100%;
  }
  .still-info {
    padding: 12px 16px;
  }
  .still-title {
    font-size: 15px;
    font-weight: 800;
    margin-bottom: 2px;
  }
  .still-meta {
    font-size: 12px;
    color: var(--text-sub);
  }

  /* Weekly Section */
  .weekly-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 32px;
  }
  .weekly-header .section-desc {
    margin-bottom: 0;
  }
  .weekly-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .weekly-card {
    display: block;
    border-radius: var(--radius-card);
    overflow: hidden;
    background-color: var(--bg-card);
    position: relative;
  }
  .weekly-img-box {
    aspect-ratio: 16 / 9;
  }
  .weekly-img-box img {
    width: 100%;
    height: 100%;
  }
  .weekly-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: rgba(9,9,12,0.8);
    color: var(--amber);
    font-size: 12px;
    font-weight: 800;
    padding: 4px 8px;
    border-radius: 4px;
    backdrop-filter: blur(4px);
  }
  .weekly-info {
    padding: 16px;
  }
  .weekly-title {
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 4px;
  }
  .weekly-meta {
    font-size: 13px;
    color: var(--text-sub);
  }

  /* Behind Section */
  .behind-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
  }
  .behind-stat {
    display: flex;
    align-items: baseline;
    gap: 8px;
  }
  .behind-stat-value {
    font-size: 40px;
    font-weight: 900;
    color: var(--amber);
  }
  .behind-stat-label {
    font-size: 14px;
    color: var(--text-sub);
  }
  .behind-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 16px;
    margin-bottom: 40px;
  }
  .behind-card {
    border-radius: var(--radius-card);
    overflow: hidden;
    position: relative;
    background-color: var(--bg-card);
  }
  .behind-card img {
    width: 100%;
    height: 100%;
    aspect-ratio: 4 / 3;
  }
  .behind-card:first-child img {
    aspect-ratio: 16 / 9;
  }
  .behind-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px 16px 16px;
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
    font-size: 13px;
    font-weight: 800;
    color: var(--text-main);
  }
  .behind-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  .behind-footer p {
    font-size: 15px;
    color: var(--text-sub);
  }

  /* Download Section */
  .download-section {
    background-color: var(--amber);
    color: #09090c;
    padding: 80px 0;
  }
  .download-section .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
  }
  .download-tag {
    font-size: 12px;
    font-weight: 800;
    color: rgba(9,9,12,0.6);
    margin-bottom: 16px;
    display: block;
  }
  .download-title {
    font-size: 48px;
    margin-bottom: 16px;
    font-weight: 900;
  }
  .download-desc {
    font-size: 18px;
    margin-bottom: 32px;
    color: rgba(9,9,12,0.8);
  }
  .download-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
  }
  .step-item {
    display: flex;
    gap: 12px;
    align-items: flex-start;
  }
  .step-num {
    background-color: #09090c;
    color: var(--amber);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 800;
    flex-shrink: 0;
    margin-top: 2px;
  }
  .step-text {
    font-size: 15px;
    font-weight: 600;
  }
  .download-note {
    font-size: 13px;
    color: rgba(9,9,12,0.6);
  }

  /* Download Card */
  .download-card {
    background-color: #09090c;
    color: var(--text-main);
    border-radius: 16px;
    padding: 32px;
  }
  .card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .card-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
  }
  .card-info {
    flex: 1;
  }
  .card-title {
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 4px;
  }
  .card-subtitle {
    font-size: 12px;
    color: var(--text-sub);
  }
  .card-badge {
    font-size: 10px;
    border: 1px solid var(--text-sub);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-sub);
  }
  .card-body-title {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 16px;
  }
  .device-btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-card);
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 12px;
    transition: background-color 0.2s ease;
  }
  .device-btn:hover {
    background-color: #1a1a24;
  }
  .device-name {
    font-size: 16px;
    font-weight: 800;
  }
  .device-meta {
    font-size: 12px;
    color: var(--text-sub);
    margin-top: 4px;
  }
  .device-action {
    font-size: 14px;
    font-weight: 800;
    color: var(--amber);
  }
  .card-footer {
    text-align: center;
    font-size: 12px;
    color: var(--text-sub);
    margin-top: 20px;
  }

  /* FAQ Section */
  .faq-section .container {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
  }
  .faq-title {
    font-size: 36px;
    font-weight: 900;
    margin-bottom: 16px;
  }
  .faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  details {
    background-color: var(--bg-card);
    border-radius: 8px;
    overflow: hidden;
  }
  summary {
    padding: 20px;
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  summary::-webkit-details-marker {
    display: none;
  }
  summary::after {
    content: "+";
    color: var(--amber);
    font-size: 20px;
    font-weight: 400;
  }
  details[open] summary::after {
    content: "-";
  }
  details[open] summary {
    border-bottom: 1px solid rgba(255,255,255,0.05);
  }
  .faq-content {
    padding: 20px;
    font-size: 14px;
    color: var(--text-sub);
    line-height: 1.6;
  }

  /* Footer */
  .site-footer {
    padding: 40px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    font-size: 12px;
    color: var(--text-sub);
  }
  .site-footer p {
    margin-bottom: 8px;
  }
  .site-footer a {
    color: var(--text-sub);
    transition: color 0.2s;
  }
  .site-footer a:hover {
    color: var(--amber);
  }

  /* Mobile Bottom Bar */
  .mobile-bottom-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 58px;
    background-color: var(--bg-card);
    border-top: 1px solid rgba(255,255,255,0.1);
    padding: 0 16px;
    align-items: center;
    justify-content: space-between;
    z-index: 100;
  }
  .mobile-bottom-info {
    display: flex;
    flex-direction: column;
  }
  .mobile-bottom-title {
    font-size: 14px;
    font-weight: 800;
  }
  .mobile-bottom-desc {
    font-size: 11px;
    color: var(--text-sub);
  }
  .mobile-bottom-btn {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: 6px;
  }

  /* Responsive */
  @media (max-width: 1020px) {
    .nav-links { display: none; }
    .header-right .status-badge { display: none; }
    .hero-grid { gap: 40px; }
  }

  @media (max-width: 820px) {
    .hero-grid { grid-template-columns: 1fr; }
    .hero-visual { margin-top: 40px; }
    .hero-stats { flex-wrap: wrap; gap: 20px; justify-content: flex-start; }
    .download-section .container { grid-template-columns: 1fr; }
    .faq-section .container { grid-template-columns: 1fr; gap: 40px; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .behind-grid { grid-template-columns: repeat(2, 1fr); }
    .interface-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  }

  @media (max-width: 640px) {
    .hero-buttons { flex-direction: column; }
    .grid-4 { grid-template-columns: 1fr; }
    .interface-grid { 
      display: flex; 
      overflow-x: auto; 
      scroll-snap-type: x mandatory; 
      gap: 16px; 
      padding-bottom: 16px;
    }
    .interface-item { 
      min-width: 240px; 
      scroll-snap-align: start; 
    }
    .poster-grid { 
      display: flex; 
      overflow-x: auto; 
      scroll-snap-type: x mandatory; 
      gap: 16px; 
      padding-bottom: 16px;
    }
    .poster-item { 
      min-width: 260px; 
      scroll-snap-align: start; 
    }
    .still-grid { 
      display: flex; 
      overflow-x: auto; 
      scroll-snap-type: x mandatory; 
      gap: 16px; 
      padding-bottom: 16px;
    }
    .still-item { 
      min-width: 260px; 
      scroll-snap-align: start; 
    }
    .weekly-grid { grid-template-columns: 1fr; }
    .behind-grid { 
      display: flex; 
      overflow-x: auto; 
      scroll-snap-type: x mandatory; 
      gap: 16px; 
      padding-bottom: 16px;
    }
    .behind-card { 
      min-width: 260px; 
      scroll-snap-align: start; 
    }
    .behind-card:first-child img { aspect-ratio: 4/3; }
    .behind-stats { flex-wrap: wrap; gap: 24px; }
    .behind-footer { flex-direction: column; align-items: flex-start; gap: 16px; }
    .mobile-bottom-bar { display: flex; }
    .hero-title { font-size: 36px; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .stat-item { border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 16px; }
    .header-btn { display: none; }
    .weekly-header { flex-direction: column; align-items: flex-start; gap: 16px; }
    .download-title { font-size: 36px; }
    .download-card { padding: 24px; }
  }