:root {
  --c-main: #0096FA;
  --c-main2: #3EB1FF;
  --c-dark: #0D1626;
  --c-border: #E3E9F2;
  --c-bg: #F5F8FC;
  --c-card: #FFFFFF;
  --c-text: #17233D;
  --c-text2: #5D6B85;
  --c-star: #FFB800;
  --c-ok: #0EA76B;
  --c-ok-bg: #E5F8EE;
  --c-gray: #7A8699;
  --c-gray-bg: #F1F4F9;
  --radius: 14px;
  --shadow: 0 6px 18px rgba(13, 30, 55, .08);
  --shadow-hover: 0 14px 30px rgba(13, 30, 55, .14);
  --shadow-main: 0 8px 22px rgba(0, 150, 250, .28);
  --c-main-dark: #0A8AE6;
  --c-main-bg: #E8F4FF;
  --c-dark-bg: #0A1220;
  --nav-h: 64px;
  --maxw: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif; background: var(--c-bg); color: var(--c-text); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; width: 100%; height: auto; }
button { font-family: inherit; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 84px 0; }
section[id] { scroll-margin-top: 76px; }

.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255, 255, 255, .92); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); border-bottom: 1px solid transparent; transition: border-color .3s, box-shadow .3s; }
.nav.scrolled { border-color: var(--c-border); box-shadow: 0 4px 16px rgba(13, 30, 55, .06); }
.nav-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; height: var(--nav-h); display: flex; align-items: center; }
.logo { font-size: 24px; font-weight: 800; color: var(--c-main); letter-spacing: .5px; white-space: nowrap; }
.logo span { color: var(--c-dark); }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 20px; }
.nav-link { font-size: 14px; font-weight: 500; color: var(--c-text2); white-space: nowrap; transition: color .2s; }
.nav-link:hover { color: var(--c-main); }
.nav-btn { margin-left: 28px; display: inline-flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 600; color: #fff; background: var(--c-main); border-radius: 999px; padding: 8px 18px; box-shadow: var(--shadow-main); transition: transform .2s, box-shadow .2s; white-space: nowrap; }
.nav-btn:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(0, 150, 250, .35); }

.hero { padding: calc(var(--nav-h) + 64px) 0 88px; background: linear-gradient(180deg, var(--c-main-bg) 0%, var(--c-bg) 100%); overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero h1 { font-size: 44px; line-height: 1.3; letter-spacing: 1px; }
.hero h1 .hl { color: var(--c-main); }
.hero-sub { margin: 20px 0 32px; color: var(--c-text2); font-size: 16px; max-width: 520px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 30px; border-radius: 999px; font-size: 16px; font-weight: 700; color: #fff; background: linear-gradient(135deg, var(--c-main), var(--c-main2)); box-shadow: var(--shadow-main); transition: transform .25s, box-shadow .25s; }
.btn:hover { transform: translateY(-3px); box-shadow: 0 14px 30px rgba(0, 150, 250, .38); }
.btn-dark { background: linear-gradient(135deg, #0F1B30, #243A5E); box-shadow: 0 8px 22px rgba(15, 27, 48, .28); }
.btn-dark:hover { box-shadow: 0 14px 30px rgba(15, 27, 48, .36); }
.hero-img { border-radius: 20px; overflow: hidden; box-shadow: 0 22px 44px rgba(13, 30, 55, .18); }

.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head h2 { font-size: 32px; letter-spacing: .5px; }
.sec-head p { margin-top: 10px; color: var(--c-text2); font-size: 15px; }

.works-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.work-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); overflow: hidden; transition: transform .28s, box-shadow .28s; }
.work-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.work-card img { transition: transform .4s; }
.work-card:hover img { transform: scale(1.04); }

.intro-lead { max-width: 820px; margin: 0 auto; text-align: center; color: var(--c-text2); font-size: 16px; }
.intro-cards { margin-top: 44px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.intro-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 30px 28px; transition: transform .28s, box-shadow .28s; }
.intro-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.intro-card h3 { font-size: 18px; margin-bottom: 10px; }
.intro-card h3 i { font-style: normal; color: var(--c-main); margin-right: 6px; }
.intro-card p { color: var(--c-text2); font-size: 14.5px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 30px 28px; transition: transform .28s, box-shadow .28s; }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.feature-ico { width: 52px; height: 52px; border-radius: 14px; background: var(--c-main-bg); color: var(--c-main); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.feature-ico svg { width: 26px; height: 26px; }
.feature-card h3 { font-size: 18px; margin-bottom: 10px; }
.feature-card p { color: var(--c-text2); font-size: 14.5px; }

.compare-head, .compare-item { display: grid; grid-template-columns: 170px 1fr 1fr; gap: 16px; align-items: center; }
.compare-head { padding: 0 24px 12px; color: var(--c-text2); font-size: 14px; }
.compare-list { display: flex; flex-direction: column; gap: 14px; }
.compare-item { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px 24px; transition: transform .25s, box-shadow .25s; }
.compare-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.compare-name { font-weight: 700; font-size: 15px; }
.tag { display: inline-flex; align-items: center; padding: 7px 14px; border-radius: 999px; font-size: 14px; font-weight: 600; line-height: 1.4; }
.tag-main { background: var(--c-ok-bg); color: var(--c-ok); }
.tag-other { background: var(--c-gray-bg); color: var(--c-gray); }
.tag em { font-style: normal; font-weight: 700; margin-right: 8px; }
@media (min-width: 769px) {
  .tag em { display: none; }
}

.data-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; }
.data-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 28px 12px; text-align: center; transition: transform .25s, box-shadow .25s; }
.data-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.data-num { font-size: 34px; font-weight: 800; color: var(--c-main); line-height: 1.2; }
.data-label { margin-top: 8px; color: var(--c-text2); font-size: 14px; }

.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 26px 24px; transition: transform .28s, box-shadow .28s; }
.review-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.review-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0; background: linear-gradient(135deg, var(--c-main), #63C3FF); color: #fff; font-size: 18px; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.review-user { min-width: 0; }
.review-name { font-weight: 700; font-size: 15px; }
.stars { color: var(--c-star); font-size: 13px; letter-spacing: 2px; margin-top: 2px; }
.review-text { color: var(--c-text2); font-size: 14.5px; }

.update-card { max-width: 780px; margin: 0 auto; background: var(--c-card); border: 1px solid var(--c-border); border-radius: 18px; padding: 40px 44px; box-shadow: var(--shadow); }
.version-badge { display: inline-block; padding: 8px 22px; border-radius: 999px; background: linear-gradient(135deg, var(--c-main), var(--c-main2)); color: #fff; font-size: 19px; font-weight: 800; }
.update-date { margin: 16px 0 24px; color: var(--c-text2); font-size: 14px; }
.update-list li { position: relative; padding: 12px 0 12px 30px; color: var(--c-text); font-size: 15px; border-bottom: 1px dashed var(--c-border); }
.update-list li:last-child { border-bottom: none; }
.update-list li::before { content: "✓"; position: absolute; left: 0; top: 12px; color: var(--c-main); font-weight: 800; }

.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; transition: transform .25s, box-shadow .25s; }
.faq-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 19px 22px; background: none; border: none; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--c-text); text-align: left; }
.faq-arrow { flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%; background: var(--c-main-bg); color: var(--c-main); display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 700; transition: transform .3s, background .3s; }
.faq-item.open .faq-arrow { transform: rotate(45deg); background: var(--c-main); color: #fff; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-a p { padding: 0 22px 20px; color: var(--c-text2); font-size: 14.5px; }
.faq-item.open .faq-a { max-height: 320px; }

.dl-section { background: linear-gradient(160deg, var(--c-dark-bg) 0%, #12223C 100%); }
.dl-wrap { text-align: center; }
.dl-wrap h1 { color: #fff; font-size: 38px; letter-spacing: 1px; }
.dl-meta { margin: 14px 0 34px; color: #9FB0CC; font-size: 14px; }
.dl-btns { display: flex; justify-content: center; gap: 18px; flex-wrap: wrap; }
.dl-tip { margin-top: 26px; color: #C7D4E8; font-size: 14px; }

.footer { background: var(--c-dark-bg); padding: 28px 20px; text-align: center; color: #93A3BF; font-size: 14px; border-top: 1px solid rgba(255, 255, 255, .06); }
.footer a { color: #fff; }

#topBtn { position: fixed; right: 26px; bottom: 30px; z-index: 90; width: 46px; height: 46px; border: none; border-radius: 50%; background: var(--c-main); color: #fff; font-size: 18px; cursor: pointer; box-shadow: var(--shadow-main); opacity: 0; visibility: hidden; transform: translateY(12px); transition: opacity .3s, transform .3s, visibility .3s; }
#topBtn.show { opacity: 1; visibility: visible; transform: none; }
#topBtn:hover { background: var(--c-main-dark); }

@media (max-width: 1024px) {
  .nav-links { gap: 14px; }
  .nav-link { font-size: 13px; }
  .nav-btn { margin-left: 18px; padding: 8px 14px; }
  .hero h1 { font-size: 38px; }
  .works-grid, .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .data-grid { grid-template-columns: repeat(3, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; gap: 36px; text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-btns { justify-content: center; }
  .hero-img { max-width: 420px; margin: 0 auto; width: 100%; }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .nav-inner { padding: 0 20px; }
  .nav-btn { margin-left: auto; }
  .hero { padding: calc(var(--nav-h) + 44px) 0 56px; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 15px; }
  .hero-btns { flex-direction: column; gap: 14px; }
  .hero-btns .btn { width: 100%; }
  .sec-head { margin-bottom: 32px; }
  .sec-head h2 { font-size: 26px; }
  .works-grid, .feature-grid, .review-grid, .intro-cards { grid-template-columns: 1fr; gap: 16px; }
  .compare-head { display: none; }
  .compare-item { grid-template-columns: 1fr; gap: 10px; }
  .compare-item .tag { width: 100%; }
  .data-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .data-num { font-size: 28px; }
  .update-card { padding: 28px 22px; }
  .dl-wrap h1 { font-size: 28px; }
  .dl-meta { font-size: 12.5px; white-space: nowrap; margin: 10px 0 26px; }
  .dl-btns { flex-direction: column; gap: 14px; }
  .dl-btns .btn { width: 100%; }
  .faq-q { font-size: 15px; padding: 16px; }
  .faq-a p { padding: 0 16px 16px; }
  #topBtn { right: 16px; bottom: 20px; width: 42px; height: 42px; }
}