:root {
    --pink: #f7a8c9;
    --purple: #a87fd6;
    --sky: #9fd4f4;
    --ink: #2a2138;
    --ink-light: #564a68;
    --white: #ffffff;
    --radius: 18px;
  }

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

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #b8e2f7 0%, #d9c8f2 30%, #fad5e6 65%, #f7c0dc 100%);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }

  /* ---------- Header ---------- */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  }

  .header-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 19px;
    font-weight: 700;
    color: var(--ink);
    text-decoration: none;
  }

  .brand img {
    height: 34px;
    width: 34px;
    border-radius: 9px;
    object-fit: cover;
  }

  .nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--ink);
    padding: 4px 8px;
  }

  .main-nav {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
  }

  .main-nav a {
    font-size: 14px;
    color: var(--ink-light);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: 999px;
    transition: background .25s, color .25s;
    white-space: nowrap;
  }

  .main-nav a:hover {
    background: rgba(168, 127, 214, 0.18);
    color: var(--ink);
  }

  /* ---------- Layout ---------- */
  main {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px 60px;
  }

  section {
    padding: 56px 0;
  }

  .section-head {
    text-align: center;
    margin-bottom: 36px;
  }

  .section-head h2 {
    font-size: clamp(23px, 3.4vw, 32px);
    font-weight: 800;
    letter-spacing: .5px;
    color: var(--ink);
    margin-bottom: 10px;
  }

  .section-head p {
    font-size: 15px;
    color: var(--ink-light);
    max-width: 620px;
    margin: 0 auto;
  }

  /* ---------- Hero ---------- */
  .hero {
    padding: 52px 0 40px;
    position: relative;
  }

  .hero-inner {
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 28px;
    padding: clamp(28px, 5vw, 56px);
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 40px;
    align-items: center;
    box-shadow: 0 18px 50px rgba(120, 90, 160, 0.14);
    backdrop-filter: blur(6px);
  }

  .hero h1 {
    font-size: clamp(26px, 4.2vw, 42px);
    line-height: 1.35;
    font-weight: 800;
    margin-bottom: 18px;
    background: linear-gradient(95deg, #7c5ba8, #d2649a);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .hero-desc {
    font-size: 16px;
    color: var(--ink-light);
    margin-bottom: 28px;
  }

  .download-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    padding: 13px 26px;
    border-radius: 999px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform .2s, box-shadow .2s;
  }

  .btn:hover { transform: translateY(-2px); }

  .btn-primary {
    background: linear-gradient(120deg, #b76fd6, #ef85b4);
    color: #fff;
    box-shadow: 0 8px 20px rgba(190, 110, 180, 0.32);
  }

  .btn-secondary {
    background: #fff;
    color: #8a5cb0;
    box-shadow: 0 6px 16px rgba(140, 110, 180, 0.16);
  }

  .hero-note {
    font-size: 13px;
    color: var(--ink-light);
  }

  .hero-visual {
    display: flex;
    justify-content: center;
    gap: 14px;
  }

  .hero-visual img {
    width: 150px;
    border-radius: 16px;
    box-shadow: 0 14px 30px rgba(110, 80, 150, 0.24);
    object-fit: cover;
  }

  .hero-visual img:nth-child(2) {
    transform: translateY(-24px);
  }

  /* ---------- Feature grid ---------- */
  .feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }

  .feature-card {
    background: rgba(255, 255, 255, 0.62);
    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: var(--radius);
    padding: 26px 22px;
    transition: transform .25s, box-shadow .25s;
  }

  .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(130, 100, 170, 0.14);
  }

  .feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #6f4f9b;
  }

  .feature-card p {
    font-size: 14.5px;
    color: var(--ink-light);
  }

  /* ---------- Steps ---------- */
  .steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .step {
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius);
    padding: 24px 20px;
    border: 1px solid rgba(255, 255, 255, 0.9);
  }

  .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(120deg, #a87fd6, #ef8ab8);
    color: #fff;
    font-weight: 700;
    font-size: 15px;
    margin-bottom: 12px;
  }

  .step h3 {
    font-size: 16px;
    margin-bottom: 8px;
  }

  .step p {
    font-size: 14px;
    color: var(--ink-light);
  }

  /* ---------- Immersive band ---------- */
  .immersive {
    background: rgba(255, 255, 255, 0.55);
    border-radius: 26px;
    padding: clamp(26px, 4vw, 46px);
    border: 1px solid rgba(255, 255, 255, 0.85);
  }

  .immersive-layout {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 36px;
    align-items: center;
  }

  .immersive-layout h2 {
    font-size: clamp(22px, 3vw, 30px);
    margin-bottom: 14px;
    color: var(--ink);
  }

  .immersive-layout p {
    font-size: 15px;
    color: var(--ink-light);
    margin-bottom: 14px;
  }

  .immersive-gallery {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: thin;
  }

  .immersive-gallery img {
    width: 130px;
    flex: 0 0 auto;
    border-radius: 14px;
    box-shadow: 0 10px 22px rgba(110, 80, 150, 0.2);
  }

  /* ---------- Poster sections ---------- */
  .poster-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .poster-card {
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.9);
    transition: transform .25s;
  }

  .poster-card:hover { transform: scale(1.02); }

  .poster-card img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    display: block;
  }

  .poster-card figcaption {
    padding: 12px 14px;
    font-size: 14px;
    color: var(--ink-light);
  }

  .poster-card figcaption strong {
    display: block;
    font-size: 15px;
    color: var(--ink);
    margin-bottom: 2px;
  }

  /* ---------- Dual column info ---------- */
  .info-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .info-box {
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius);
    padding: 30px 26px;
    border: 1px solid rgba(255, 255, 255, 0.9);
  }

  .info-box h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: #6f4f9b;
  }

  .info-box p {
    font-size: 14.5px;
    color: var(--ink-light);
    margin-bottom: 10px;
  }

  .info-box ul {
    list-style: none;
    margin-top: 8px;
  }

  .info-box li {
    font-size: 14.5px;
    color: var(--ink-light);
    padding-left: 20px;
    position: relative;
    margin-bottom: 8px;
  }

  .info-box li::before {
    content: "◆";
    position: absolute;
    left: 0;
    color: #d47fb8;
    font-size: 10px;
    top: 6px;
  }

  /* ---------- Wide banner ---------- */
  .wide-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.9);
  }

  .wide-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    min-height: 280px;
  }

  .wide-banner-text {
    padding: clamp(26px, 4vw, 44px);
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .wide-banner-text h2 {
    font-size: clamp(21px, 2.8vw, 28px);
    margin-bottom: 12px;
  }

  .wide-banner-text p {
    font-size: 15px;
    color: var(--ink-light);
    margin-bottom: 10px;
  }

  /* ---------- FAQ / search terms ---------- */
  .search-terms {
    text-align: center;
    padding: 40px 0 10px;
  }

  .search-terms h2 {
    font-size: 18px;
    color: var(--ink-light);
    margin-bottom: 16px;
    font-weight: 600;
  }

  .term-cloud {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }

  .term-cloud span {
    font-size: 13.5px;
    color: #7a5a9e;
    background: rgba(255, 255, 255, 0.6);
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.9);
  }

  /* ---------- Footer ---------- */
  .site-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.7);
    padding: 30px 20px 40px;
    text-align: center;
    font-size: 12.5px;
    color: rgba(70, 55, 90, 0.62);
  }

  .site-footer p { margin-bottom: 6px; }

  .site-footer a {
    color: rgba(70, 55, 90, 0.62);
    text-decoration: none;
  }

  .site-footer a:hover { text-decoration: underline; }

  /* ---------- Modal ---------- */
  .modal-mask {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(40, 25, 60, 0.45);
    z-index: 999;
    align-items: center;
    justify-content: center;
    padding: 20px;
  }

  .modal-mask.active { display: flex; }

  .modal-box {
    background: #fff;
    border-radius: 18px;
    padding: 26px 22px;
    max-width: 380px;
    width: 100%;
    box-shadow: 0 20px 50px rgba(60, 40, 90, 0.3);
    text-align: center;
  }

  .modal-box p {
    font-size: 14.5px;
    color: var(--ink);
    line-height: 1.7;
    margin-bottom: 16px;
  }

  .copy-input {
    width: 100%;
    font-size: 12.5px;
    color: #6a5580;
    border: 1px solid #e3d7ef;
    background: #faf6fd;
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 14px;
    text-align: center;
    outline: none;
  }

  .modal-actions {
    display: flex;
    gap: 10px;
  }

  .modal-actions .btn {
    flex: 1;
    justify-content: center;
    padding: 11px 0;
    font-size: 14px;
  }

  .btn-ghost {
    background: #f1e9f8;
    color: #7a5a9e;
  }

  /* ---------- Responsive ---------- */
  @media (max-width: 1024px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .poster-grid { grid-template-columns: repeat(3, 1fr); }
    .hero-inner { grid-template-columns: 1fr; text-align: center; }
    .download-row { justify-content: center; }
    .hero-visual { justify-content: center; }
    .immersive-layout { grid-template-columns: 1fr; }
    .wide-banner { grid-template-columns: 1fr; }
    .info-split { grid-template-columns: 1fr; }
  }

  @media (max-width: 768px) {
    .nav-toggle { display: block; }
    .main-nav {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      right: 0;
      background: rgba(255, 255, 255, 0.97);
      flex-direction: column;
      padding: 10px 16px 16px;
      gap: 2px;
      border-bottom: 1px solid #eee;
    }
    .main-nav.open { display: flex; }
    .main-nav a { padding: 10px 12px; font-size: 15px; }
    .feature-grid { grid-template-columns: 1fr; }
    .steps { grid-template-columns: 1fr; }
    .poster-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-visual img { width: 120px; }
    .hero-visual img:nth-child(2) { transform: translateY(-14px); }
    .hero-visual img:nth-child(3) { display: none; }
    .immersive-gallery img { width: 108px; }
    .wide-banner img { min-height: 220px; }
  }

  @media (max-width: 480px) {
    .poster-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .download-row { flex-direction: column; align-items: stretch; }
    .download-row .btn { justify-content: center; }
  }