:root {
  --primary: #FF6B35;
  --primary-dark: #F25A1E;
  --dark: #23262F;
  --text: #2B2F38;
  --text-sub: #5C6470;
  --border: #E7EAF1;
  --bg: #F7F8FC;
  --card: #FFFFFF;
  --radius: 16px;
  --shadow-hover: 0 16px 32px rgba(255, 107, 53, 0.14);
  --grad-warm: linear-gradient(180deg, #FFF5EE 0%, var(--bg) 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }
section { padding: 84px 0; }
.section-title { font-size: 32px; font-weight: 800; color: var(--dark); text-align: center; letter-spacing: 0.5px; }
.section-sub { text-align: center; color: var(--text-sub); font-size: 15px; margin: 10px 0 46px; }
h1 em { font-style: normal; color: var(--primary); }

.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255, 255, 255, 0.94); border-bottom: 1px solid var(--border); transition: box-shadow 0.3s; }
.nav.scrolled { box-shadow: 0 6px 20px rgba(35, 38, 47, 0.07); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-size: 20px; font-weight: 800; color: var(--dark); letter-spacing: 1px; }
.logo em { font-style: normal; color: var(--primary); }
.nav-menu { display: flex; align-items: center; gap: 18px; }
.nav-menu a { font-size: 14px; color: var(--text-sub); transition: color 0.2s; }
.nav-menu a:hover { color: var(--primary); }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 13px 28px; border-radius: 999px; font-size: 15px; font-weight: 600; transition: transform 0.3s, box-shadow 0.3s, background 0.3s; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 20px rgba(255, 107, 53, 0.28); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 12px 26px rgba(255, 107, 53, 0.38); }
.btn-dark { background: var(--dark); color: #fff; }
.btn-dark:hover { background: #12151C; transform: translateY(-2px); box-shadow: 0 12px 26px rgba(35, 38, 47, 0.25); }
.nav-btn { padding: 7px 16px; font-size: 13px; }
.nav-btn:hover { background: var(--primary-dark); box-shadow: 0 6px 14px rgba(255, 107, 53, 0.35); transform: none; }

.hero, .download { background: var(--grad-warm); }
.hero { padding: 150px 0 90px; }
.hero-inner { display: flex; align-items: center; gap: 64px; }
.hero-text { flex: 1; }
.hero h1 { font-size: 42px; font-weight: 800; color: var(--dark); line-height: 1.3; margin-bottom: 18px; }
.hero-desc { font-size: 16px; color: var(--text-sub); line-height: 1.9; margin-bottom: 32px; max-width: 580px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-img { flex: 0 0 320px; }
.hero-img img { border-radius: 20px; box-shadow: 0 24px 48px rgba(35, 38, 47, 0.16); }

.works, .features { background: var(--card); }
.works-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.work-card { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); background: var(--bg); transition: transform 0.3s, box-shadow 0.3s; }
.work-card img { width: 100%; }
.work-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }

.intro-lead { max-width: 860px; margin: 0 auto 44px; }
.intro-lead p { font-size: 15px; color: var(--text-sub); line-height: 2; margin-bottom: 14px; text-align: center; }
.intro-grid, .features-grid, .reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.intro-card, .feature-card, .review-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); transition: transform 0.3s, box-shadow 0.3s; }
.intro-card:hover, .feature-card:hover, .review-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.intro-card { padding: 26px; }
.intro-card h3 { font-size: 17px; color: var(--dark); margin-bottom: 8px; }
.feature-card { padding: 30px 26px; }
.feature-ico { display: block; font-size: 34px; margin-bottom: 14px; }
.feature-card h3 { font-size: 18px; color: var(--dark); margin-bottom: 10px; }
.feature-card p { line-height: 1.8; }
.review-card { padding: 24px; }
.intro-card p, .feature-card p, .review-card p { font-size: 14px; color: var(--text-sub); }
.review-card p { line-height: 1.9; }

.compare-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.compare-table { width: 100%; border-spacing: 0; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.compare-table th { background: var(--dark); color: #fff; font-size: 15px; font-weight: 600; padding: 16px 18px; text-align: center; }
.compare-table td { padding: 15px 18px; font-size: 14px; color: var(--text-sub); text-align: center; border-top: 1px solid var(--border); }
.compare-table td:first-child { color: var(--dark); font-weight: 600; text-align: left; }
.compare-table tbody tr:nth-child(even) { background: #FAFBFF; }
.compare-table th:nth-child(2), .compare-table td:nth-child(2) { background: #FFF4EC; color: var(--primary-dark); font-weight: 600; }

.data { background: var(--dark); }
.data .section-title { color: #fff; }
.data .section-sub { color: #9AA1AF; }
.data-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.data-card { text-align: center; background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: var(--radius); padding: 30px 20px; transition: transform 0.3s, box-shadow 0.3s; }
.data-card:hover { transform: translateY(-6px); box-shadow: 0 16px 32px rgba(0, 0, 0, 0.3); }
.data-num { font-size: 40px; font-weight: 800; color: var(--primary); line-height: 1.2; margin-bottom: 8px; }
.data-label { font-size: 14px; color: #C6CBD6; }

.review-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 18px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.review-card:nth-child(even) .avatar { background: var(--dark); }
.review-name { font-size: 15px; font-weight: 600; color: var(--dark); }
.stars { color: #FFB400; font-size: 14px; letter-spacing: 2px; margin-top: 2px; }

.update-card { max-width: 780px; margin: 0 auto; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 40px; }
.update-head { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
.update-ver { font-size: 30px; font-weight: 800; color: var(--primary); }
.update-time { font-size: 14px; color: var(--text-sub); }
.update-list li { font-size: 15px; color: var(--text); line-height: 1.9; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.update-list li:last-child { border-bottom: none; }
.update-list li::before { content: "✓"; color: var(--primary); font-weight: 700; margin-right: 10px; }

.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item { background: var(--card); border: 1px solid var(--border); border-radius: 14px; margin-bottom: 14px; overflow: hidden; transition: box-shadow 0.3s; }
.faq-item.open { box-shadow: 0 10px 24px rgba(35, 38, 47, 0.08); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 18px 22px; background: none; border: none; font-size: 15px; font-weight: 600; color: var(--dark); cursor: pointer; text-align: left; }
.faq-arrow { font-size: 16px; color: var(--primary); font-weight: 400; transition: transform 0.3s; flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-a-inner { padding: 0 22px 20px; font-size: 14px; color: var(--text-sub); line-height: 1.9; }

.download { text-align: center; }
.download h1 { font-size: 38px; font-weight: 800; color: var(--dark); margin-bottom: 14px; }
.dl-meta { font-size: 14px; color: var(--text-sub); margin-bottom: 30px; }
.dl-btns { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.dl-tip { margin-top: 22px; font-size: 14px; color: var(--text-sub); }

.footer { background: var(--dark); padding: 26px 0; text-align: center; }
.footer p { font-size: 13px; color: #A6ADBB; }
.footer a { color: #fff; font-weight: 600; transition: color 0.2s; }
.footer a:hover { color: var(--primary); }

#topBtn { position: fixed; right: 24px; bottom: 24px; z-index: 99; width: 46px; height: 46px; border: none; border-radius: 50%; background: var(--primary); color: #fff; font-size: 20px; cursor: pointer; box-shadow: 0 10px 24px rgba(255, 107, 53, 0.35); opacity: 0; visibility: hidden; transform: translateY(12px); transition: all 0.3s; }
#topBtn.show { opacity: 1; visibility: visible; transform: translateY(0); }
#topBtn:hover { background: var(--primary-dark); }

.img-ph { aspect-ratio: 2 / 3; width: 100%; display: flex; align-items: center; justify-content: center; background: linear-gradient(160deg, #FFF0E6, #FFE3D3); color: #E8A88C; font-size: 20px; font-weight: 700; letter-spacing: 4px; border-radius: 20px; }

@media (max-width: 1024px) {
  .hero { padding: 130px 0 70px; }
  .hero h1 { font-size: 36px; }
  .hero-img { flex-basis: 280px; }
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .data-num { font-size: 34px; }
}

@media (max-width: 900px) {
  .nav-menu { display: none; }
  .hero-inner { flex-direction: column; gap: 40px; text-align: center; }
  .hero-desc { margin: 0 auto 30px; }
  .hero-btns { justify-content: center; }
  .hero-img { width: 320px; max-width: 100%; }
  .intro-grid, .features-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .container { padding: 0 20px; }
  section { padding: 60px 0; }
  .section-title { font-size: 26px; }
  .section-sub { font-size: 14px; margin-bottom: 34px; }
  .nav-inner { height: 56px; }
  .hero { padding: 110px 0 56px; }
  .hero h1 { font-size: 28px; }
  .hero-desc { font-size: 15px; }
  .hero-btns, .dl-btns { flex-direction: column; width: 100%; }
  .hero-btns .btn, .dl-btns .btn { width: 100%; }
  .hero-img { width: 280px; }
  .works-grid { grid-template-columns: 1fr; gap: 20px; }
  .intro-grid, .features-grid, .reviews-grid { grid-template-columns: 1fr; }
  .data-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .data-card { padding: 22px 12px; }
  .data-num { font-size: 30px; }
  .compare-table th, .compare-table td { padding: 12px 8px; font-size: 13px; }
  .compare-table th { font-size: 14px; }
  .update-card { padding: 26px 20px; }
  .update-ver { font-size: 24px; }
  .dl-meta { font-size: 12px; white-space: nowrap; }
  .download h1 { font-size: 28px; }
  #topBtn { right: 16px; bottom: 16px; width: 42px; height: 42px; }
}