:root {
    --bg: linear-gradient(160deg, #E0EFFE 0%, #DBEAFE 35%, #EBF2FF 60%, #F0F6FF 100%);
    --card: rgba(255, 255, 255, .7);
    --card2: rgba(255, 255, 255, .5);
    --border: rgba(37, 99, 235, .1);
    --border2: rgba(37, 99, 235, .06);
    --accent: #2563EB;
    --accent2: #1D4ED8;
    --white: #FFF;
    --text: #1F2937;
    --dim: #6B7280;
    --dim2: #9CA3AF
  }

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

  html {
    scroll-behavior: smooth
  }

  body {
    font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
    background: #EBF4FF;
    background-image: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
    min-height: 100vh
  }

  .mesh {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden
  }

  .mesh .orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(140px);
    opacity: .2
  }

  .mesh .o1 {
    width: 600px;
    height: 600px;
    background: #93C5FD;
    top: -15%;
    right: -10%;
    animation: morph 16s ease-in-out infinite
  }

  .mesh .o2 {
    width: 500px;
    height: 500px;
    background: #A5B4FC;
    bottom: -10%;
    left: -8%;
    animation: morph 20s ease-in-out infinite reverse
  }

  .mesh .o3 {
    width: 300px;
    height: 300px;
    background: #67E8F9;
    top: 40%;
    left: 50%;
    animation: morph 14s ease-in-out infinite 4s
  }

  @keyframes morph {

    0%,
    100% {
      transform: translate(0, 0) scale(1)
    }

    33% {
      transform: translate(40px, -30px) scale(1.1)
    }

    66% {
      transform: translate(-20px, 40px) scale(.9)
    }
  }

  .grid-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image: linear-gradient(45deg, rgba(37, 99, 235, .07) 1px, transparent 1px), linear-gradient(-45deg, rgba(37, 99, 235, .07) 1px, transparent 1px);
    background-size: 48px 48px
  }

  /* ── Nav ── */
  nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 0 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(240, 246, 255, .85);
    backdrop-filter: blur(24px) saturate(1.8);
    border-bottom: 1px solid rgba(37, 99, 235, .06)
  }

  nav::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 5%;
    right: 5%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, .12), transparent)
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none
  }

  .logo span {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    color: #1D4ED8;
    letter-spacing: 1.5px
  }

  .nr {
    display: flex;
    gap: 16px;
    align-items: center
  }

  .nr a {
    color: var(--dim);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color .2s
  }

  .nr a:hover {
    color: #1D4ED8
  }

  .nb {
    padding: 8px 24px;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    color: #fff !important;
    font-weight: 700 !important;
    font-size: 13px !important;
    transition: all .3s;
    box-shadow: 0 2px 16px rgba(37, 99, 235, .25)
  }

  .nb:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 24px rgba(37, 99, 235, .35)
  }

  /* ── Hero: 紧凑居中 ── */
  .hero {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 110px 60px 36px;
    text-align: center;
    position: relative;
    overflow: hidden
  }


  .hi {
    max-width: 1100px;
    width: 100%;
    position: relative;
    z-index: 2
  }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 5px 16px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .7);
    border: 1px solid rgba(37, 99, 235, .15);
    font-size: 12px;
    font-weight: 600;
    color: #2563EB;
    margin-bottom: 24px;
    backdrop-filter: blur(12px)
  }

  .badge .dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #34D399;
    box-shadow: 0 0 8px #34D399;
    animation: bk 2s ease infinite
  }

  @keyframes bk {

    0%,
    100% {
      opacity: 1
    }

    50% {
      opacity: .3
    }
  }

  .hero h1 {
    font-size: clamp(40px, 5.5vw, 64px);
    font-weight: 700;
    line-height: 1.1;
    color: #111827;
    margin-bottom: 18px;
    letter-spacing: -1.5px
  }

  .hero h1 em {
    font-style: normal;
    background: linear-gradient(135deg, #1D4ED8, #3B82F6, #1D4ED8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: shimmer 4s ease infinite
  }

  @keyframes shimmer {

    0%,
    100% {
      background-position: 0% 50%
    }

    50% {
      background-position: 100% 50%
    }
  }

  .hero .sub {
    font-size: 16px;
    color: var(--dim);
    max-width: 520px;
    margin: 0 auto 32px;
    line-height: 1.8
  }

  .ha {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap
  }

  .hero .sub {
    max-width: 520px
  }

  .b1 {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 36px;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    color: #fff;
    font-weight: 700;
    font-size: 16px;
    text-decoration: none;
    transition: all .35s;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 24px rgba(37, 99, 235, .3), 0 0 0 1px rgba(37, 99, 235, .1)
  }

  .b1 {
    position: relative
  }

  .b1::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    opacity: .4;
    z-index: -1;
    animation: pulse 2.5s ease-in-out infinite
  }

  @keyframes pulse {

    0%,
    100% {
      transform: scale(1);
      opacity: .3
    }

    50% {
      transform: scale(1.08);
      opacity: 0
    }
  }

  .b1:hover {
    background: linear-gradient(135deg, #1D4ED8, #2563EB);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 36px rgba(37, 99, 235, .35), 0 0 0 1px rgba(37, 99, 235, .15)
  }

  .b2 {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 13px 32px;
    border-radius: 999px;
    background: #fff;
    backdrop-filter: blur(8px);
    color: #374151;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all .25s;
    border: 1.5px solid #E5E7EB;
    cursor: pointer
  }

  .b2:hover {
    border-color: #2563EB;
    color: #2563EB;
    background: #fff
  }

  /* ── Feature Tags ── */
  .ftags {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    padding: 0 60px;
    max-width: 1000px;
    margin: 0 auto
  }

  .ftag {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px 24px;
    border-radius: 16px;
    background: rgba(255, 255, 255, .65);
    border: 1px solid rgba(37, 99, 235, .08);
    backdrop-filter: blur(16px);
    transition: all .35s cubic-bezier(.22, 1, .36, 1);
    cursor: default;
    box-shadow: 0 2px 12px rgba(37, 99, 235, .04), inset 0 1px 0 rgba(255, 255, 255, .8)
  }

  .ftag:hover {
    border-color: rgba(37, 99, 235, .2);
    background: rgba(255, 255, 255, .9);
    box-shadow: 0 12px 36px rgba(37, 99, 235, .08), inset 0 1px 0 rgba(255, 255, 255, .9);
    transform: translateY(-4px)
  }

  .ftag .fi {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(37, 99, 235, .06);
    border: 1px solid rgba(37, 99, 235, .08);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all .3s
  }

  .ftag:hover .fi {
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(37, 99, 235, .2)
  }

  .ftag:hover .fi svg {
    stroke: #fff
  }

  .ftag .ft {
    display: flex;
    flex-direction: column;
    gap: 2px
  }

  .ftag .ft h4 {
    font-size: 16px;
    font-weight: 700;
    color: #111827;
    line-height: 1.2
  }

  .ftag .ft p {
    font-size: 12px;
    color: var(--dim);
    line-height: 1.3
  }

  /* ── Download ── */
  .dl {
    padding: 48px 60px 56px
  }

  .dw {
    max-width: 1100px;
    margin: 0 auto
  }

  .dh {
    text-align: center;
    margin-bottom: 40px
  }

  .dh .tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .6);
    border: 1px solid rgba(37, 99, 235, .12);
    font-size: 11px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 12px;
    letter-spacing: 1px
  }

  .dh h2 {
    font-size: clamp(24px, 3vw, 36px);
    font-weight: 700;
    color: #111827;
    margin-bottom: 8px;
    letter-spacing: -.5px
  }

  .dh p {
    font-size: 15px;
    color: var(--dim)
  }

  .dg {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 28px
  }

  .dc {
    background: rgba(255, 255, 255, .65);
    border: 1px solid rgba(37, 99, 235, .08);
    border-radius: 20px;
    padding: 36px 28px;
    text-align: center;
    transition: all .4s cubic-bezier(.22, 1, .36, 1);
    cursor: pointer;
    backdrop-filter: blur(16px);
    box-shadow: 0 2px 12px rgba(37, 99, 235, .04), inset 0 1px 0 rgba(255, 255, 255, .8)
  }

  .dc {
    position: relative;
    overflow: hidden
  }

  .dc::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    width: 14px;
    height: 14px;
    border-top: 2px solid rgba(37, 99, 235, .15);
    border-left: 2px solid rgba(37, 99, 235, .15);
    border-radius: 2px 0 0 0;
    transition: all .3s;
    pointer-events: none
  }

  .dc .hud-br {
    position: absolute;
    bottom: 10px;
    right: 10px;
    width: 14px;
    height: 14px;
    border-bottom: 2px solid rgba(37, 99, 235, .15);
    border-right: 2px solid rgba(37, 99, 235, .15);
    border-radius: 0 0 2px 0;
    transition: all .3s;
    pointer-events: none
  }

  .dc:hover::after {
    border-color: rgba(37, 99, 235, .35);
    width: 18px;
    height: 18px
  }

  .dc:hover .hud-br {
    border-color: rgba(37, 99, 235, .35);
    width: 18px;
    height: 18px
  }

  .dc::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 21px;
    background: conic-gradient(from var(--a, 0deg), transparent 60%, rgba(37, 99, 235, .3) 80%, transparent 100%);
    opacity: 0;
    transition: opacity .4s;
    z-index: -1
  }

  .dc:hover::before {
    opacity: 1;
    animation: spin 2.5s linear infinite
  }

  @keyframes spin {
    to {
      --a: 360deg
    }
  }

  @property --a {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false
  }

  .dc:hover {
    background: rgba(255, 255, 255, .95);
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(37, 99, 235, .1);
    border-color: rgba(37, 99, 235, .15)
  }

  .icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: rgba(37, 99, 235, .06);
    border: 1px solid rgba(37, 99, 235, .1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    color: #2563EB;
    transition: all .35s cubic-bezier(.22, 1, .36, 1)
  }

  .dc:hover .icon {
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 16px rgba(37, 99, 235, .25);
    transform: scale(1.08)
  }

  .dc h3 {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 4px
  }

  .ver {
    font-size: 13px;
    color: var(--dim);
    margin-bottom: 20px
  }

  .db {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 11px 28px;
    border-radius: 999px;
    background: linear-gradient(135deg, #2563EB, #3B82F6);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    transition: all .3s;
    box-shadow: 0 2px 12px rgba(37, 99, 235, .2)
  }

  .dc:hover .db {
    background: linear-gradient(135deg, #1D4ED8, #2563EB);
    box-shadow: 0 4px 20px rgba(37, 99, 235, .3)
  }


  /* ── Footer ── */
  footer {
    border-top: 1px solid rgba(37, 99, 235, .06);
    padding: 48px 60px 32px;
    position: relative
  }

  footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 5%;
    right: 5%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, .1), transparent)
  }

  .fw {
    max-width: 1100px;
    margin: 0 auto
  }

  .fg {
    display: grid;
    grid-template-columns: 2.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 36px
  }

  .fd {
    font-size: 14px;
    color: var(--dim);
    line-height: 1.7;
    max-width: 300px;
    margin-top: 14px
  }

  .fc h4 {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--dim2);
    margin-bottom: 12px
  }

  .fc a {
    display: block;
    font-size: 13px;
    color: var(--dim);
    text-decoration: none;
    padding: 3px 0;
    transition: color .2s
  }

  .fc a:hover {
    color: #2563EB
  }

  .fb {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid rgba(37, 99, 235, .06);
    font-size: 12px;
    color: var(--dim2)
  }

  .fl {
    display: flex;
    gap: 16px
  }

  .fl a {
    color: var(--dim2);
    text-decoration: none;
    font-size: 12px
  }

  .fl a:hover {
    color: var(--dim)
  }

  .ba {
    text-align: center;
    padding-top: 14px;
    font-size: 12px
  }

  .ba a {
    color: var(--dim2);
    text-decoration: none
  }

  .rv {
    opacity: 0;
    transform: translateY(20px);
    transition: all .7s cubic-bezier(.16, 1, .3, 1)
  }

  .rv.v {
    opacity: 1;
    transform: translateY(0)
  }

  .rv.d1 {
    transition-delay: .1s
  }

  .rv.d2 {
    transition-delay: .2s
  }

  .rv.d3 {
    transition-delay: .3s
  }

  .rv.d4 {
    transition-delay: .35s
  }

  @media(max-width:960px) {
    nav {
      padding: 0 16px;
      height: 52px
    }

    .mesh .orb {
      opacity: .12
    }

    .hero {
      padding: 80px 16px 24px;
      text-align: center
    }

    .hero .sub {
      margin: 0 auto 24px
    }

    .ha {
      justify-content: center
    }

    .ftags {
      padding: 0 16px;
      gap: 10px;
      grid-template-columns: repeat(2, 1fr)
    }

    .ftag {
      padding: 16px 14px
    }

    .dl {
      padding: 32px 16px 40px
    }

    .dg {
      grid-template-columns: 1fr;
      max-width: 280px;
      margin-left: auto;
      margin-right: auto
    }

    .fg {
      grid-template-columns: 1fr 1fr;
      gap: 20px
    }

    .fb {
      flex-direction: column;
      gap: 8px;
      text-align: center
    }

    footer {
      padding: 32px 16px 20px
    }
  }

  .noise {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: .025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 200px
  }

  .modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, .7);
    align-items: center;
    justify-content: center
  }

  .modal.show {
    display: flex
  }

  .modal img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, .4)
  }

  .modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .2);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    transition: background .2s
  }

  .modal-close:hover {
    background: rgba(255, 255, 255, .3)
  }

  .download-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .6);
    z-index: 999;
    align-items: center;
    justify-content: center
  }

  .download-overlay.show {
    display: flex
  }

  .download-modal {
    background: #fff;
    border-radius: 20px;
    padding: 32px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, .4);
    max-width: 320px;
    width: 90%;
    position: relative
  }

  .download-modal img {
    width: 200px;
    height: 200px;
    margin: 0 auto 20px;
    display: block;
  }

  .download-title {
    font-size: 16px;
    font-weight: 600;
    color: #111827;
    margin-bottom: 8px;
  }

  .download-subtitle {
    font-size: 14px;
    color: #6B7280;
    margin-bottom: 24px;
  }

  .download-platform {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    color: #6B7280;
  }

  .download-platform svg {
    width: 18px;
    height: 18px;
  }

  .download-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #F3F4F6;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #6B7280;
    transition: all .2s
  }

  .download-close:hover {
    background: #E5E7EB;
    color: #374151;
  }