:root {
        --ink: #202838;
        --soft-ink: #566174;
        --muted: #8490a3;
        --line: #dfe7f3;
        --paper: #ffffff;
        --mist: #f6f9ff;
        --blue: #79baff;
        --blue-deep: #4b8ee8;
        --lavender: #c8b9ff;
        --pink: #ffc9de;
        --shadow: 0 22px 70px rgba(54, 77, 124, 0.12);
        --display-font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
        --heading-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
      }

      * {
        box-sizing: border-box;
      }

      html {
        scroll-behavior: smooth;
      }

      body {
        margin: 0;
        color: var(--ink);
        font-family: var(--heading-font);
        background:
          radial-gradient(circle at 16% 6%, rgba(121, 186, 255, 0.2), transparent 28%),
          radial-gradient(circle at 86% 10%, rgba(200, 185, 255, 0.18), transparent 28%),
          linear-gradient(180deg, #ffffff 0%, #f7faff 44%, #ffffff 100%);
      }

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

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

      .shell {
        width: min(1160px, calc(100% - 48px));
        margin: 0 auto;
      }

      .nav {
        position: sticky;
        top: 0;
        z-index: 20;
        background: rgba(255, 255, 255, 0.86);
        border-bottom: 1px solid rgba(223, 231, 243, 0.9);
        backdrop-filter: blur(16px);
      }

      .nav-inner {
        height: 72px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 28px;
      }

      .brand {
        display: flex;
        align-items: center;
        gap: 12px;
        font-family: var(--heading-font);
        font-size: 19px;
        font-weight: 700;
        letter-spacing: 0;
      }

      .brand-mark {
        width: 42px;
        height: 42px;
        border-radius: 8px;
        position: relative;
        overflow: hidden;
        object-fit: cover;
      }

      .nav-links {
        display: flex;
        align-items: center;
        gap: 24px;
        color: var(--soft-ink);
        font-size: 14px;
      }

      .nav-links a:hover {
        color: var(--blue-deep);
      }

      .nav-links a:last-child {
        height: 36px;
        padding: 0 14px;
        display: inline-flex;
        align-items: center;
        border: 1px solid rgba(121, 186, 255, 0.36);
        border-radius: 8px;
        background: #ffffff;
        color: var(--blue-deep);
        font-weight: 700;
        box-shadow: 0 10px 24px rgba(75, 142, 232, 0.08);
      }

      .hero {
        padding: 44px 0 58px;
        text-align: center;
      }

      .hero h1 {
        margin: 0 0 14px;
        font-family: var(--display-font);
        font-size: clamp(62px, 8vw, 108px);
        font-weight: 750;
        line-height: 1.04;
        letter-spacing: 0.01em;
      }

      .hero p {
        margin: 0 auto 24px;
        max-width: 720px;
        color: var(--soft-ink);
        font-family: var(--heading-font);
        font-size: 23px;
        line-height: 1.6;
        letter-spacing: 0;
      }

      .download-cards {
        display: grid;
        grid-template-columns: repeat(2, minmax(340px, 430px));
        justify-content: center;
        gap: 28px;
      }

      .download-card {
        min-height: 196px;
        padding: 34px 36px;
        border: 1px solid #cfd9e8;
        border-radius: 8px;
        background:
          linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(248, 251, 255, 0.96)),
          #ffffff;
        display: grid;
        grid-template-columns: 82px 1fr;
        align-items: center;
        gap: 22px;
        text-align: left;
        box-shadow: 0 22px 62px rgba(54, 77, 124, 0.12);
        transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
      }

      .download-card:hover {
        transform: translateY(-4px);
        border-color: rgba(121, 186, 255, 0.72);
        box-shadow: var(--shadow);
      }

      .download-card:first-child {
        background:
          linear-gradient(135deg, rgba(121, 186, 255, 0.12), rgba(255, 255, 255, 0.96) 48%),
          #ffffff;
      }

      .download-card:last-child {
        background:
          linear-gradient(135deg, rgba(200, 185, 255, 0.16), rgba(255, 255, 255, 0.96) 48%),
          #ffffff;
      }

      .download-icon {
        width: 82px;
        height: 82px;
        color: var(--ink);
        padding: 13px;
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.82);
        border: 1px solid rgba(121, 186, 255, 0.18);
      }

      img.download-icon {
        display: block;
        object-fit: contain;
        box-sizing: border-box;
      }

      .download-card strong {
        display: block;
        margin-bottom: 10px;
        font-family: var(--heading-font);
        font-size: 28px;
        letter-spacing: 0;
      }

      .download-card span {
        color: var(--muted);
        font-size: 15px;
      }

      .hero .download-release-meta {
        margin: 18px auto 0;
        color: var(--muted);
        font-size: 14px;
        line-height: 1.6;
        text-align: center;
      }

      .section {
        padding: 84px 0;
        border-top: 1px solid rgba(223, 231, 243, 0.88);
      }

      .split {
        display: grid;
        grid-template-columns: 0.8fr 1.2fr;
        gap: 68px;
        align-items: center;
      }

      h2 {
        margin: 0 0 18px;
        font-family: var(--heading-font);
        font-weight: 650;
        font-size: clamp(32px, 4vw, 48px);
        line-height: 1.18;
        letter-spacing: 0;
      }

      .lead {
        margin: 0;
        color: var(--soft-ink);
        line-height: 1.85;
      }

      .image-panel {
        border: 1px solid var(--line);
        border-radius: 8px;
        background: #ffffff;
        box-shadow: var(--shadow);
        overflow: hidden;
        position: relative;
      }

      .image-panel img {
        width: 100%;
        height: auto;
      }

      .center-head {
        text-align: center;
        max-width: 760px;
        margin: 0 auto 42px;
      }

      .cards {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
      }

      .care-card {
        border: 1px solid var(--line);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.92);
        box-shadow: 0 18px 52px rgba(54, 77, 124, 0.08);
        padding: 18px;
        transition: transform 180ms ease, box-shadow 180ms ease;
      }

      .care-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow);
      }

      .care-art {
        aspect-ratio: 1456 / 1048;
        height: auto;
        margin-bottom: 20px;
        border-radius: 8px;
        overflow: hidden;
        position: relative;
        background: var(--mist);
        border: 1px solid rgba(223, 231, 243, 0.82);
      }

      .care-art img {
        width: 100%;
        height: 100%;
        object-fit: cover;
      }

      .care-card h3 {
        margin: 0 0 10px;
        font-family: var(--heading-font);
        font-size: 20px;
        letter-spacing: 0;
      }

      .care-card p {
        margin: 0;
        color: var(--soft-ink);
        line-height: 1.75;
        font-size: 14px;
      }

      .states {
        background: linear-gradient(180deg, rgba(246, 249, 255, 0.78), rgba(255, 255, 255, 0.92));
      }

      .states-panel {
        position: relative;
      }

      .motion-stage-bg {
        --motion-size: 188px;
        min-height: 680px;
        border: 1px solid rgba(121, 186, 255, 0.28);
        border-radius: 8px;
        background:
          radial-gradient(circle at 20% 12%, rgba(255, 255, 255, 0.34), transparent 20%),
          radial-gradient(circle at 82% 72%, rgba(200, 185, 255, 0.2), transparent 24%),
          linear-gradient(180deg, #43bef6 0%, #0f95da 100%);
        box-shadow: var(--shadow);
        position: relative;
        overflow: hidden;
      }

      .motion-stage-bg::before {
        content: "";
        position: absolute;
        inset: 0;
        background:
          linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
          linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
        background-size: 54px 54px;
        opacity: 0.32;
      }

      .motion-grid {
        position: absolute;
        inset: 0;
      }

      .motion-card {
        position: absolute;
        width: var(--motion-size);
        height: var(--motion-size);
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
        overflow: visible;
      }

      .motion-card:nth-child(1) {
        left: 76px;
        top: 62px;
      }

      .motion-card:nth-child(2) {
        left: 332px;
        top: 98px;
      }

      .motion-card:nth-child(3) {
        left: 588px;
        top: 66px;
      }

      .motion-card:nth-child(4) {
        left: 608px;
        right: auto;
        top: 348px;
      }

      .motion-card:nth-child(5) {
        left: 112px;
        top: 338px;
      }

      .motion-card:nth-child(6) {
        left: 358px;
        top: 384px;
      }

      .motion-card:nth-child(7) {
        display: none;
      }

      .motion-card:nth-child(8) {
        left: 850px;
        top: 382px;
      }

      .motion-card:nth-child(9) {
        right: 82px;
        top: 96px;
      }

      .motion-card:hover {
        transform: translateY(-4px) scale(1.03);
        box-shadow: none;
      }

      .motion-card {
        transition: transform 180ms ease;
      }

      .motion-card img {
        width: 100%;
        height: 100%;
        display: block;
        object-fit: contain;
        background: transparent;
        filter: saturate(1.06) contrast(1.02) drop-shadow(0 14px 16px rgba(5, 64, 111, 0.14));
      }

      .motion-frame {
        position: relative;
        min-height: 680px;
      }

      .video-fallback {
        padding: 10px;
        color: var(--muted);
        font-size: 12px;
      }

      .state-badge {
        width: 118px;
        height: 118px;
        border-radius: 50%;
        border: 1px solid rgba(121, 186, 255, 0.42);
        background: #ffffff;
        box-shadow: 0 14px 34px rgba(54, 77, 124, 0.08);
        display: grid;
        place-items: center;
        color: var(--soft-ink);
        font-size: 13px;
        font-weight: 800;
      }

      .states-image {
        border: 1px solid var(--line);
        border-radius: 8px;
        background: #ffffff;
        box-shadow: var(--shadow);
        overflow: hidden;
        position: relative;
      }

      .footer {
        padding: 32px 0 44px;
        border-top: 1px solid rgba(223, 231, 243, 0.9);
        color: var(--muted);
        font-size: 13px;
      }

      .footer-inner {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 24px;
        text-align: center;
      }

      .footer-info {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px 18px;
      }

      .footer-info a:hover {
        color: var(--blue-deep);
      }

      .footer-links {
        display: flex;
        flex-wrap: wrap;
        gap: 18px;
      }

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

      .mobile-copy-bar {
        display: none;
      }

      .mobile-copy-button {
        width: 100%;
        min-height: 52px;
        padding: 12px 20px;
        border: 1px solid var(--blue-deep);
        border-radius: 8px;
        background: var(--blue-deep);
        color: #ffffff;
        font-family: inherit;
        font-size: 16px;
        font-weight: 700;
        line-height: 1.4;
        cursor: pointer;
        box-shadow: 0 10px 24px rgba(75, 142, 232, 0.22);
      }

      .mobile-copy-button:active {
        transform: translateY(1px);
      }

      .mobile-copy-button:focus-visible {
        outline: 3px solid rgba(121, 186, 255, 0.5);
        outline-offset: 2px;
      }

      #contact,
      #wechat {
        scroll-margin-top: 88px;
      }

      .contact-section {
        background: linear-gradient(180deg, rgba(246, 249, 255, 0.78), rgba(255, 255, 255, 0.92));
      }

      .contact-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }

      .contact-card {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        gap: 24px;
        min-height: 220px;
        padding: 28px 30px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: rgba(255, 255, 255, 0.92);
        box-shadow: 0 18px 52px rgba(54, 77, 124, 0.08);
      }

      .contact-card h3 {
        margin: 0 0 10px;
        font-family: var(--heading-font);
        font-size: 20px;
      }

      .contact-card p {
        margin: 0;
        color: var(--soft-ink);
        line-height: 1.75;
        font-size: 14px;
      }

      .contact-button {
        align-self: flex-start;
        height: 42px;
        padding: 0 20px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border: 1px solid rgba(121, 186, 255, 0.36);
        border-radius: 8px;
        background: var(--blue-deep);
        color: #ffffff;
        font-family: inherit;
        font-size: 14px;
        font-weight: 700;
        cursor: pointer;
        box-shadow: 0 10px 24px rgba(75, 142, 232, 0.18);
        transition: transform 180ms ease, box-shadow 180ms ease;
      }

      .contact-button:hover {
        transform: translateY(-2px);
        box-shadow: 0 14px 28px rgba(75, 142, 232, 0.24);
      }

      .contact-button.secondary {
        background: #ffffff;
        color: var(--blue-deep);
        box-shadow: 0 10px 24px rgba(75, 142, 232, 0.08);
      }

      .modal-backdrop {
        position: fixed;
        inset: 0;
        z-index: 100;
        display: none;
        align-items: center;
        justify-content: center;
        padding: 24px;
        background: rgba(32, 40, 56, 0.48);
        backdrop-filter: blur(6px);
      }

      .modal-backdrop.is-open {
        display: flex;
      }

      .wechat-modal {
        position: relative;
        width: min(420px, 100%);
        padding: 32px 28px 28px;
        border: 1px solid var(--line);
        border-radius: 12px;
        background: #ffffff;
        box-shadow: var(--shadow);
        text-align: center;
      }

      .manual-copy-modal {
        position: relative;
        width: min(420px, 100%);
        padding: 32px 28px 28px;
        border: 1px solid var(--line);
        border-radius: 12px;
        background: #ffffff;
        box-shadow: var(--shadow);
        text-align: center;
      }

      .manual-copy-modal h3 {
        margin: 0 0 10px;
        font-size: 24px;
      }

      .manual-copy-modal p {
        margin: 0 0 20px;
        color: var(--soft-ink);
        font-size: 14px;
        line-height: 1.7;
      }

      .manual-copy-modal input {
        width: 100%;
        min-height: 48px;
        padding: 0 12px;
        border: 1px solid #cfd9e8;
        border-radius: 8px;
        color: var(--ink);
        background: var(--mist);
        font: inherit;
      }

      .mobile-copy-toast {
        max-width: calc(100% - 32px);
        position: fixed;
        z-index: 150;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        padding: 12px 16px;
        border-radius: 8px;
        background: rgba(32, 40, 56, 0.94);
        color: #ffffff;
        font-size: 14px;
        line-height: 1.5;
        text-align: center;
        box-shadow: 0 12px 32px rgba(32, 40, 56, 0.2);
      }

      .wechat-modal h3 {
        margin: 0 0 10px;
        font-family: var(--heading-font);
        font-size: 24px;
      }

      .wechat-modal p {
        margin: 0 0 22px;
        color: var(--soft-ink);
        line-height: 1.7;
        font-size: 14px;
      }

      .modal-close {
        position: absolute;
        top: 12px;
        right: 14px;
        width: 36px;
        height: 36px;
        border: 0;
        border-radius: 8px;
        background: transparent;
        color: var(--muted);
        font-size: 28px;
        line-height: 1;
        cursor: pointer;
      }

      .modal-close:hover {
        color: var(--blue-deep);
        background: rgba(246, 249, 255, 0.92);
      }

      .wechat-qr {
        width: min(240px, 100%);
        aspect-ratio: 1 / 1;
        margin: 0 auto 16px;
        display: grid;
        place-items: center;
        border: 1px dashed rgba(121, 186, 255, 0.48);
        border-radius: 8px;
        background: var(--mist);
        color: var(--muted);
        font-size: 14px;
      }

      .wechat-qr img {
        width: 100%;
        height: 100%;
        object-fit: contain;
      }

      .wechat-note {
        color: var(--muted);
        font-size: 12px;
        line-height: 1.6;
      }

      .mac-chip-modal {
        position: relative;
        width: min(640px, 100%);
        overflow: hidden;
        border: 1px solid var(--line);
        border-radius: 12px;
        background: #ffffff;
        box-shadow: var(--shadow);
      }

      .mac-chip-modal-body {
        padding: 36px 32px 28px;
        text-align: center;
      }

      .mac-chip-modal-body h3 {
        margin: 0 0 28px;
        font-family: var(--heading-font);
        font-size: 28px;
        line-height: 1.35;
        color: var(--ink);
      }

      .mac-chip-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 16px;
      }

      .mac-chip-action {
        min-height: 60px;
        padding: 14px 18px;
        border: 1px solid transparent;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 4px;
        font-family: inherit;
        line-height: 1.4;
        cursor: pointer;
        transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
      }

      .mac-chip-action-label {
        font-size: 17px;
        font-weight: 700;
      }

      .mac-chip-action-primary {
        border-color: var(--blue-deep);
        background: var(--blue-deep);
        color: #ffffff;
        box-shadow: 0 10px 24px rgba(75, 142, 232, 0.18);
      }

      .mac-chip-action-secondary {
        border-color: rgba(75, 142, 232, 0.48);
        background: #ffffff;
        color: var(--blue-deep);
        box-shadow: none;
      }

      .mac-chip-action:hover {
        transform: translateY(-2px);
        box-shadow: 0 14px 28px rgba(75, 142, 232, 0.24);
      }

      .mac-chip-action-secondary:hover {
        background: var(--mist);
      }

      .mac-chip-guide {
        padding: 24px 28px 28px;
        background: #f5f6f8;
        border-top: 1px solid rgba(32, 40, 56, 0.06);
      }

      .mac-chip-guide img {
        display: block;
        width: 100%;
        height: auto;
        border-radius: 8px;
      }

      @media (max-width: 720px) {
        .mac-chip-modal-body {
          padding: 28px 20px 22px;
        }

        .mac-chip-modal-body h3 {
          margin-bottom: 22px;
          font-size: 22px;
        }

        .mac-chip-actions {
          grid-template-columns: 1fr;
        }

        .mac-chip-guide {
          padding: 18px 16px 20px;
        }
      }

      @media (max-width: 980px) {
        .split,
        .states-panel {
          grid-template-columns: 1fr;
        }

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

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

      }

      @media (max-width: 720px) {
        .shell {
          width: min(100% - 28px, 1160px);
        }

        .nav-inner {
          height: auto;
          padding: 15px 0;
        }

        .nav-links {
          display: none;
        }

        .hero {
          padding: 58px 0 64px;
        }

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

        .hero h1 {
          letter-spacing: 0;
        }

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

        .download-card {
          min-height: 126px;
          grid-template-columns: 54px 1fr;
          padding: 22px;
        }

        .download-icon {
          width: 54px;
          height: 54px;
          padding: 10px;
        }

        .section {
          padding: 64px 0;
        }

        .state-badge {
          width: 96px;
          height: 96px;
        }

        .motion-grid {
          position: relative;
          display: grid;
          grid-template-columns: repeat(3, 1fr);
          gap: 0;
          padding: 24px 16px 18px;
        }

        .motion-stage-bg,
        .motion-frame {
          min-height: auto;
        }

        .motion-card,
        .motion-card:nth-child(n) {
          position: relative;
          left: auto;
          right: auto;
          top: auto;
          width: 100%;
          height: auto;
        }

        .motion-card img {
          aspect-ratio: 1 / 1;
        }

        .footer-inner {
          display: block;
        }

        .footer {
          padding-bottom: calc(120px + env(safe-area-inset-bottom));
        }

        .footer-links {
          margin-top: 16px;
        }

        .contact-card {
          min-height: auto;
          padding: 22px 20px;
        }

        .wechat-modal {
          padding: 28px 20px 22px;
        }

        .manual-copy-modal {
          padding: 28px 20px 22px;
        }

        .mobile-copy-bar {
          position: fixed;
          z-index: 50;
          right: 0;
          bottom: 0;
          left: 0;
          display: block;
          padding: 12px 14px calc(12px + env(safe-area-inset-bottom));
          border-top: 1px solid rgba(223, 231, 243, 0.9);
          background: rgba(255, 255, 255, 0.96);
          box-shadow: 0 -10px 28px rgba(54, 77, 124, 0.08);
          backdrop-filter: blur(16px);
        }
      }