/* ========================================
   八界AI官网 — 自定义样式表
   亮色科技感 / 毛玻璃 / 渐变 / 响应式
   主色: #227cff  辅色: #24dc7f
   参考: guanjia.qq.com 亮色调配色方案
   ======================================== */

/* ---- CSS Variables ---- */
:root {
  /* 背景色 - 亮色系(参考腾讯管家) */
  --bg-primary: #F5F7FA;
  --bg-secondary: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-hero-start: #1A56DB;
  --bg-hero-mid: #227CFF;
  --bg-hero-end: #4DA6FF;

  /* 文字色 - 亮底深字 */
  --text-primary: #1E293B;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-light: #FFFFFF;

  /* 品牌色 - 用户指定 */
  --accent-blue: #227cff;
  --accent-green: #24dc7f;
  --accent-purple: #7C6AFF;
  --accent-cyan: #00B4D8;
  --accent-orange: #FF7849;

  /* UI */
  --border-color: rgba(30, 41, 59, 0.10);
  --gradient-primary: linear-gradient(135deg, #227cff 0%, #1A56DB 100%);
  --gradient-accent: linear-gradient(135deg, #24dc7f 0%, #227cff 50%, #7C6AFF 100%);
  --gradient-hero: linear-gradient(135deg, #1A56DB 0%, #227cff 40%, #4DA6FF 70%, #89CFFF 100%);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-blue: 0 4px 20px rgba(34, 124, 255, 0.25);
  --radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Base ---- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(34, 124, 255, 0.25);
  color: var(--text-primary);
}

/* ---- Skip Link ---- */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-blue);
  color: #fff;
  padding: 8px 16px;
  z-index: 10000;
  text-decoration: none;
  border-radius: 0 0 8px 0;
  font-weight: 500;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* ---- Typography ---- */

/* 默认渐变文字：深色品牌渐变（用于白底/浅底区域） */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-blue) 0%, #7C6AFF 60%, var(--accent-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 蓝色渐变背景区域（Hero / CTA）— 白色渐变 */
#hero .gradient-text,
.cta-section .gradient-text {
  background: linear-gradient(135deg, #FFFFFF 0%, #B8E0FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- Navigation (严格参考 guanjia.qq.com header-v18) ---- */
#header {
  position: fixed;
  top: 10px;
  left: 50% !important;
  transform: translateX(-50%);
  height: 94px !important;
  width: 1200px !important;
  max-width: calc(100% - 24px);
  padding-bottom: 30px;
  z-index: 1000;
  transition: opacity 0.3s ease-in-out;
}

#header .header-wraper {
  position: relative;
  width: 100%;
  height: 64px !important;
  background-color: rgba(255, 255, 255, 0.80);
  border: 1px solid rgba(30, 41, 59, 0.10);
  border-radius: 80px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  display: flex;
  align-items: center;
}

@supports not (backdrop-filter: blur(20px)) {
  #header .header-wraper {
    background-color: #FFFFFF;
  }
}

#header .header-logo-icon {
  margin-left: 24px;
  width: 30px;
  height: 30px;
  vertical-align: middle;
  object-fit: contain;
}

#header .logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

#header .header-logo-text {
  margin-left: 2px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
  line-height: 30px;
}

/* 汉堡菜单按钮 — PC端默认隐藏 */
#header .mobile-menu-toggle {
  display: none;
}

#header .nav-font-style {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 20px;
  letter-spacing: 0px;
  text-align: center;
  color: var(--text-secondary);
  cursor: pointer;
}

#header .header-nav1 {
  position: absolute;
  left: 360px;
  height: 100%;
  width: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#header .header-nav2 {
  position: absolute;
  left: 458px;
  height: 100%;
  width: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#header .header-nav3 {
  position: absolute;
  left: 596px;
  height: 100%;
  width: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#header .header-nav4 {
  position: absolute;
  left: 694px;
  height: 100%;
  width: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#header .nav-font-style a {
  color: inherit;
  text-decoration: none;
  display: block;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#header .nav-inner-1 {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

#header .nav-inner-2 {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  transition: all 0.3s ease;
}

.nav-active {
  background-color: rgba(34, 124, 255, 0.08) !important;
  border-radius: 80px;
  padding: 12px 24px;
  height: auto !important;
  transition: all 0.3s ease;
}

.nav-active-text {
  font-weight: 700 !important;
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: all 0.3s ease;
}

/* 当前页面永久高亮 — 不被 hover 移除 */
.nav-current .nav-inner-1 {
  background-color: rgba(34, 124, 255, 0.08) !important;
  border-radius: 80px;
  padding: 12px 24px;
  height: auto !important;
}

.nav-current .nav-inner-2 {
  font-weight: 700 !important;
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 下载按钮 */
#header .banner-btn-a {
  position: absolute;
  right: 12px;
  text-decoration: none;
}

#header .banner-btn-wrap {
  position: relative;
  width: 120px;
  height: 43px;
}

#header .banner-btn {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 80px;
  font-size: 14px;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

#header .banner-btn-default {
  background: linear-gradient(135deg, #227cff 0%, #1A56DB 100%);
  color: #fff;
  opacity: 1;
}

#header .banner-btn-hover {
  background: linear-gradient(135deg, #24dc7f 0%, #14B863 100%);
  color: #fff;
  opacity: 0;
}

#header .banner-btn-wrap:hover .banner-btn-default { opacity: 0; }
#header .banner-btn-wrap:hover .banner-btn-hover { opacity: 1; }

/* 登录/开源入口 */
#header .login-nav {
  position: absolute;
  right: 150px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

#header .nologin {
  display: flex;
}

#header .nologin a {
  display: flex;
  height: 40px;
  width: 85px;
  justify-content: space-evenly;
  align-items: center;
  text-decoration: none;
  box-sizing: border-box;
  padding: 0 12px;
  color: var(--text-secondary);
  border-radius: 80px;
  transition: all 0.3s ease;
}

#header .nologin a:hover {
  background-color: rgba(34, 124, 255, 0.08);
}

#header .nologin i {
  font-size: 18px;
}

#header .nologin .top-tool-title {
  font-size: 14px;
  line-height: 32px;
  color: var(--text-secondary);
}

/* ---- Download Dropdown Panel ---- */
#download-page {
  position: fixed;
  top: 84px;
  left: 50%;
  margin-left: -463px;
  width: 926px;
  max-width: calc(100% - 24px);
  height: auto;
  padding: 30px 0;
  border-radius: 40px;
  background-color: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.10);
  opacity: 0;
  display: none;
  justify-content: space-evenly;
  align-items: center;
  z-index: 999;
  transition: all 0.4s ease-in-out;
  flex-wrap: wrap;
  gap: 20px;
}

/* 向上指示箭头 — 指向 "产品下载" 导航项 */
#download-page::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 381px;
  width: 0;
  height: 0;
  border-left: 12px solid transparent;
  border-right: 12px solid transparent;
  border-bottom: 12px solid rgba(255, 255, 255, 0.92);
  z-index: 1;
  pointer-events: none;
}

#download-page.active {
  opacity: 1;
  display: flex;
}

#download-page .download-main {
  width: 320px;
  height: 360px;
  background: linear-gradient(180deg, #F8FAFC 0%, #EEF2FF 100%);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

#download-page .download-main-icon {
  font-size: 3rem;
  color: var(--accent-blue);
  margin-bottom: 16px;
}

#download-page .download-main-btn {
  text-decoration: none;
  display: block;
  width: 100%;
}

#download-page .download-img-btn-wrap {
  position: relative;
  width: 198px;
  height: 50px;
  margin: 0 auto;
}

#download-page .download-img-btn {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 80px;
  font-size: 15px;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

#download-page .download-img-btn-default {
  background: linear-gradient(135deg, #24dc7f 0%, #14B863 100%);
  color: #fff;
  opacity: 1;
}

#download-page .download-img-btn-hover {
  background: linear-gradient(135deg, #227cff 0%, #1A56DB 100%);
  color: #fff;
  opacity: 0;
}

#download-page .download-img-btn-wrap:hover .download-img-btn-default { opacity: 0; }
#download-page .download-img-btn-wrap:hover .download-img-btn-hover { opacity: 1; }

#download-page .download-main-desc-1 {
  width: 190px;
  height: 20px;
  margin: 16px 0 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#download-page .download-main-desc-1 a {
  text-decoration: none;
}

#download-page .download-main-desc-1 .download-main-desc-1-title {
  width: 82px;
  height: 20px;
  line-height: 20px;
  font-size: 14px;
  text-align: center;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

#download-page .download-main-desc-1 .download-main-desc-1-title:hover {
  color: var(--accent-blue);
}

#download-page .download-main-desc-1-divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-color);
}

#download-page .download-main-desc-2 {
  margin-top: 8px;
  width: 120px;
  height: 17px;
  color: var(--text-muted);
  font-size: 12px;
  line-height: 17px;
  text-align: center;
}

#download-page .download-jump {
  width: 500px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

#download-page .download-jump-item {
  width: 150px;
  height: 100px;
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

#download-page .download-jump-item:hover {
  background-color: #F0F5FF;
  border-color: var(--accent-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-blue);
}

#download-page .download-jump-show {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

#download-page .download-jump-show i {
  font-size: 1.75rem;
  color: var(--accent-blue);
}

#download-page .download-jump-show span {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ---- Mobile Navigation Panel (全局默认隐藏) ---- */
#mobile-nav-panel {
  display: none;
  position: fixed;
  top: 80px;
  left: 12px;
  right: 12px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: 24px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 16px;
  z-index: 998;
  box-shadow: var(--shadow-lg);
}
#mobile-nav-panel.active { display: block; }
#mobile-nav-panel a {
  display: block;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 12px;
  font-size: 15px;
  transition: all 0.2s ease;
}
#mobile-nav-panel a:hover {
  background: rgba(34, 124, 255, 0.08);
  color: var(--accent-blue);
}

/* ---- Buttons ---- */

/* 蓝色主按钮（通用） */
.btn-accent {
  background: var(--gradient-primary);
  border: none;
  color: #FFFFFF;
  font-weight: 600;
  transition: var(--transition);
}

.btn-accent:hover,
.btn-accent:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
  color: #FFFFFF;
}

.btn-accent:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.5);
  outline-offset: 2px;
}

/* 绿色强调按钮 — 用于下载等核心CTA */
.btn-accent-green {
  background: linear-gradient(135deg, #24dc7f 0%, #14B863 100%);
  border: none;
  color: #FFFFFF;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 18px rgba(36, 220, 127, 0.30);
}

.btn-accent-green:hover,
.btn-accent-green:focus {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(36, 220, 127, 0.45);
  color: #FFFFFF;
}

.btn-accent-green:focus-visible {
  outline: 3px solid rgba(36, 220, 127, 0.5);
  outline-offset: 2px;
}

/* 通用描边按钮（浅底背景用） */
.btn-outline-light {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  font-weight: 600;
  transition: var(--transition);
  background: transparent;
}

.btn-outline-light:hover,
.btn-outline-light:focus {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #FFFFFF;
  box-shadow: var(--shadow-blue);
}

/* ---- Hero Section (参考腾讯管家蓝色渐变Hero) ---- */
#hero {
  min-height: 100vh;
  padding-top: 100px;
  padding-bottom: 60px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: -1;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
  color: #FFFFFF;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-stats { color: rgba(255, 255, 255, 0.75); }

.hero-stats .stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1;
}

.hero-stats .stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.60);
}

/* Lottie Hero (适配蓝色渐变背景 - 白色光晕) */
#lottie-hero {
  width: 100%;
  min-height: 320px;
  border-radius: var(--radius);
  position: relative;
  z-index: 1;
}

/* Fallback: 蓝色/绿色脉冲呼吸光晕（不溢出，兼容 overflow:hidden） */
#lottie-hero.lottie-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: hero-pulse-bg 4s ease-in-out infinite;
}

/* 核心光球 */
#lottie-hero.lottie-fallback::before {
  content: '';
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.45) 0%, rgba(34,124,255,0.35) 30%, rgba(34,124,255,0.08) 60%, transparent 70%);
  box-shadow:
    0 0 30px rgba(34,124,255,0.6),
    0 0 60px rgba(34,124,255,0.25),
    0 0 100px rgba(34,124,255,0.1);
  animation: hero-core-pulse 3s ease-in-out infinite;
}

/* 外层光环 */
#lottie-hero.lottie-fallback::after {
  content: '';
  position: absolute;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  box-shadow:
    0 0 20px rgba(36,220,127,0.3),
    0 0 50px rgba(36,220,127,0.1);
  animation: hero-ring-pulse 4s ease-in-out infinite;
}

@keyframes hero-pulse-bg {
  0%, 100% { background: transparent; }
  50% { background: radial-gradient(ellipse at center, rgba(34,124,255,0.04) 0%, transparent 60%); }
}

@keyframes hero-core-pulse {
  0%, 100% { transform: scale(0.8); opacity: 0.6; box-shadow: 0 0 20px rgba(34,124,255,0.5); }
  50% { transform: scale(1.15); opacity: 1; box-shadow: 0 0 50px rgba(34,124,255,0.8), 0 0 100px rgba(34,124,255,0.3); }
}

@keyframes hero-ring-pulse {
  0%, 100% { transform: scale(0.9); opacity: 0.3; }
  50% { transform: scale(1.1); opacity: 0.7; }
}

/* ---- Sections ---- */
.section { padding: 100px 0; }

.section-alt { background: #FFFFFF; }

.section-header { margin-bottom: 60px; }

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Product Cards (亮色系) ---- */
.product-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  height: 100%;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.product-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1.5px;
  background: var(--gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.product-card:hover,
.product-card:focus-within {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.product-card:hover::before,
.product-card:focus-within::before { opacity: 0.6; }

.product-card-soon {
  border-style: dashed;
  opacity: 0.85;
}

.card-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 1.25rem;
}

.product-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.product-card p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }

.tag {
  background: rgba(34, 124, 255, 0.10);
  color: var(--accent-blue);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
}

.tag-soon {
  background: rgba(148, 163, 184, 0.12);
  color: var(--text-muted);
}

.card-link {
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition);
}

.card-link:hover,
.card-link:focus {
  color: var(--accent-green);
  gap: 0.6rem;
}

/* ---- Feature Rows (AI-CMS) ---- */
.feature-row { margin-bottom: 80px; }
.feature-row:last-child { margin-bottom: 0; }

.feature-image {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  box-shadow: var(--shadow-sm);
}

.feature-img-placeholder {
  width: 100px; height: 100px;
  border-radius: 24px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: #fff;
  box-shadow: var(--shadow-blue);
}

.feature-content .feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(34, 124, 255, 0.10);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  color: var(--accent-blue);
  margin-bottom: 1rem;
}

.feature-content h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.feature-content p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}

.feature-list li i {
  color: var(--accent-green);
  font-size: 1.1rem;
}

/* ---- Feature Cards (AI-MALL) ---- */
.feature-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  height: 100%;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover,
.feature-card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(34, 124, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.feature-card-icon {
  width: 64px; height: 64px;
  border-radius: 18px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: #fff;
  margin: 0 auto 1.25rem;
  box-shadow: var(--shadow-blue);
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ---- Advantage Cards ---- */
.advantage-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  height: 100%;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.advantage-card:hover,
.advantage-card:focus-within {
  border-color: rgba(34, 124, 255, 0.3);
  box-shadow: var(--shadow-md);
}

.advantage-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: rgba(36, 220, 127, 0.10);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--accent-green);
  flex-shrink: 0;
}

.advantage-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.advantage-content p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 0;
}

/* ---- CTA Section (蓝色渐变底 + 白字) ---- */
.cta-section {
  position: relative;
  overflow: hidden;
}

.cta-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}

.cta-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #FFFFFF;
}

.cta-desc {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto 1.5rem;
}

/* CTA区域内 — 描边按钮改为白色描边(蓝底清晰可见) */
.cta-section .btn-outline-light {
  border-color: rgba(255, 255, 255, 0.65);
  color: #FFFFFF;
  background: transparent;
}

.cta-section .btn-outline-light:hover,
.cta-section .btn-outline-light:focus {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: #FFFFFF;
  box-shadow: 0 6px 24px rgba(36, 220, 127, 0.40);
}

/* Hero区域内的描边按钮同样处理 */
#hero .btn-outline-light {
  border-color: rgba(255, 255, 255, 0.60);
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.08);
}

#hero .btn-outline-light:hover,
#hero .btn-outline-light:focus {
  background: #FFFFFF;
  border-color: #FFFFFF;
  color: var(--accent-blue);
  box-shadow: 0 4px 20px rgba(255, 255, 255, 0.25);
}

/* ---- Footer (亮色调 — 参考腾讯管家) ---- */
.site-footer {
  background: #F0F2F5;
  border-top: 1px solid rgba(0,0,0,0.06);
  padding: 60px 0 30px;
  color: #5A6474;
}

.site-footer h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #1E293B;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li { margin-bottom: 0.6rem; }

.footer-links a {
  color: #5A6474;
  text-decoration: none;
  font-size: 0.92rem;
  transition: var(--transition);
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--accent-blue);
}

.footer-links a:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
  border-radius: 4px;
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 25px;
  border-top: 1px solid rgba(0,0,0,0.08);
  text-align: center;
  color: #8B95A5;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: #8B95A5;
  text-decoration: none;
  transition: var(--transition);
}

.footer-bottom a:hover,
.footer-bottom a:focus {
  color: var(--accent-blue);
}

/* ---- Back to Top (右下角返回顶部) ---- */
#back-to-top {
  position: fixed;
  bottom: 36px;
  right: 28px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(34, 124, 255, 0.35);
  font-size: 1.2rem;
  text-decoration: none;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#back-to-top:hover,
#back-to-top:focus {
  background: var(--gradient-accent);
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 24px rgba(34, 124, 255, 0.45);
}

#back-to-top i { line-height: 1; }

/* ---- Scroll Reveal ---- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal.delay-1 { transition-delay: 0.15s; }
.reveal.delay-2 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---- Focus Visible ---- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

/* ---- Responsive ---- */
@media (max-width: 1199.98px) {
  #header {
    width: 100% !important;
    left: 0 !important;
    transform: none;
    padding: 0 12px 30px;
  }
  #header .header-nav1 { left: 200px; width: 70px; }
  #header .header-nav2 { left: 285px; width: 110px; }
  #header .header-nav3 { left: 410px; width: 70px; }
  #header .header-nav4 { left: 495px; width: 110px; }
  #header .login-nav { right: 140px; }
  #download-page {
    margin-left: 0;
    left: 12px;
    right: 12px;
    width: auto;
  }
  #download-page::before {
    left: 32%;
  }
}

@media (max-width: 991.98px) {
  .section { padding: 70px 0; }
  .feature-row { margin-bottom: 50px; }
  .hero-title { font-size: 2.25rem; }
  #lottie-hero { min-height: 240px; }
  #header .header-logo-icon { width: 28px; height: 28px; }
  #header .header-logo-text { font-size: 18px; line-height: 28px; }
  #header .header-nav1 { left: 160px; width: 60px; }
  #header .header-nav2 { left: 235px; width: 90px; }
  #header .header-nav3 { left: 340px; width: 60px; }
  #header .header-nav4 { left: 415px; width: 90px; }
  #header .nav-font-style { font-size: 14px; }
  #header .login-nav { right: 130px; }
  #header .banner-btn-wrap { width: 100px; height: 38px; }
  #header .banner-btn { font-size: 12px; }
  #download-page .download-jump { width: 400px; }
  #download-page .download-jump-item { width: 120px; height: 90px; }
}

@media (max-width: 767.98px) {
  .hero-stats { justify-content: center; }
  .section { padding: 60px 0; }
  .product-card, .feature-card, .advantage-card { padding: 1.75rem; }
  .feature-image { padding: 2rem; min-height: 200px; }
  .advantage-card { flex-direction: column; }
  #header { top: 6px; }
  #header .header-wraper { height: 52px !important; border-radius: 60px; }
  #header .header-logo-icon { margin-left: 16px; width: 26px; height: 26px; }
  #header .header-logo-text { font-size: 16px; line-height: 26px; }
  #header .header-nav1,
  #header .header-nav2,
  #header .header-nav3,
  #header .header-nav4,
  #header .login-nav,
  #header .banner-btn-a { display: none; }
  #header .mobile-menu-toggle {
    display: flex !important;
    position: absolute;
    right: 16px;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.2s ease;
  }
  #header .mobile-menu-toggle:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text-primary);
  }
  #download-page {
    top: 70px;
    left: 12px;
    right: 12px;
    margin-left: 0;
    width: auto;
    border-radius: 24px;
    padding: 20px;
  }
  #download-page .download-main { width: 100%; height: auto; padding: 20px; }
  #download-page .download-jump { width: 100%; }
}

@media (max-width: 575.98px) {
  #hero { padding-top: 80px; text-align: center; }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-stats .stat-num { font-size: 1.25rem; }
  .btn-lg { padding: 0.6rem 1.25rem; font-size: 1rem; }
  #download-page .download-jump-item { width: calc(50% - 6px); height: 80px; }
}