.nav-outline-gradient {
  background:
    linear-gradient(180deg, rgba(16,12,28,0.85), rgba(16,12,28,0.65)) padding-box,
    linear-gradient(90deg, rgb(229,156,255) 0.01%, rgb(186,156,255) 50.01%, rgb(156,178,255) 100%) border-box;
  color: #fff;
  border: 1px solid transparent;
  border-radius: 9999px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.06) inset;
}
.nav-outline-gradient:hover { filter: brightness(1.05); }
:root {
  /* 深色紫系主题变量 */
  --bg: #0E0B14;
  --bg-elevated: #151023;
  --bg-hover: #1B1530;
  --line: #2A2143;

  --text-strong: #F4F2FB;
  --text: #E5E1F7;
  --text-subtle: #B9B2D5;
  --text-muted: #8C84A8;

  --primary: #8B5CF6;
  --primary-600: #7C3AED;
  --glow: #A78BFA;

  --success: #22C55E;
  --warn: #F59E0B;
  --danger: #EF4444;

  --grad-start: #7C3AED;
  --grad-end: #A78BFA;

  --radius: 12px;
  --shadow-soft: 0 10px 30px rgba(124, 58, 237, 0.15);
  --shadow-card: 0 12px 40px rgba(0,0,0,0.35);
  --ring: 0 0 0 3px rgba(167, 139, 250, 0.35);

  /* 统一紫色发光主题：用于卡片/容器的高级感背景与阴影 */
  /* 背景分三层：两层径向淡紫光源 + 一层轻玻璃叠加层（使用变量避免散落色值） */
  --glow-surface-a: radial-gradient(140% 120% at -10% -10%, rgba(167,139,250,0.16), transparent 40%);
  --glow-surface-b: radial-gradient(120% 100% at 110% 10%, rgba(124,58,237,0.14), transparent 45%);
  --glow-surface-overlay: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0));
  /* 统一描边与阴影（淡淡散发的紫色阴影叠加基础升起阴影） */
  --border-glow: rgba(167,139,250,0.22);
  --border-glow-strong: rgba(167,139,250,0.38);
  /* 阴影整体再柔和：缩小核心亮区，增加远端低透明 halo 以平滑过渡 */
  --shadow-card-base: 0 12px 34px rgba(0,0,0,0.24);
  /* 近边缘羽化：负扩散减薄明亮核心 */
  --shadow-card-glow-feather: 0 2px 10px -4px rgba(167,139,250,0.14);
  /* 主柔光层：更大模糊 + 负扩散，平滑但不糊块 */
  --shadow-card-glow-soft: 0 6px 24px -6px rgba(124,58,237,0.12);
  /* 推荐/强调时的更强柔光（仍保持负扩散避免发白） */
  --shadow-card-glow-strong: 0 14px 44px -8px rgba(124,58,237,0.18);
  /* 远端 halo：极低透明大半径，制造渐隐散射感 */
  --shadow-card-halo: 0 0 60px 12px rgba(124,58,237,0.06);
}

html, body {
  background: var(--bg);
  color: var(--text);
}

h1, h2, h3, h4 { color: var(--text-strong); }
h1, h2, h3 { font-weight: 800; }
small, .text-muted { color: var(--text-muted); }
.lead, p, .pricing-description, .testimonial-content, .author-role, .accordion-body, .pain-list li p, .pricing-features li span { color: var(--text-subtle); }
.gradient-text, .text-rose-500, .text-rose-400 { color: var(--glow); }

a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--glow); }

hr, .divider { border-color: var(--line); }

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.btn-primary {
  background: linear-gradient(90deg, var(--grad-start), var(--grad-end));
  color: var(--text-strong);
  border: 0;
  border-radius: 9999px;
  padding: 12px 22px;
  box-shadow: 0 10px 30px rgba(124,58,237,0.35);
}
.btn-primary:hover { filter: brightness(1.06); box-shadow: 0 12px 38px rgba(124,58,237,0.45); }
.btn-primary:active { filter: brightness(0.95); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) - 2px);
  padding: 11px 18px;
}
.btn-ghost:hover { background: var(--bg-hover); }

input, select, textarea {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: var(--ring);
}

.header, header.fixed-top, nav.navbar {
  /* 顶部时导航透明，底部分隔线隐藏，与顶部光源融合 */
  background: transparent;
  backdrop-filter: saturate(120%) blur(8px);
  border-bottom: 1px solid transparent;
}

.hero-section { position: relative; /* background: radial-gradient(1000px 600px at 30% -10%, rgba(167,139,250,0.12), transparent 60%), radial-gradient(800px 500px at 90% 10%, rgba(124,58,237,0.10), transparent 60%), var(--bg); */ }
.hero-content .lead { color: var(--text-subtle); }

/* 主标题不再使用渐变，统一为白色 */
.gradient-text { background: none; -webkit-background-clip: initial; background-clip: initial; color: var(--text-strong); -webkit-text-fill-color: initial; }

.footer { background: var(--bg-elevated); border-top: 1px solid var(--line); }
.footer-link { color: var(--text-subtle); }
.footer-link:hover { color: var(--primary); }
@media (max-width: 767.98px) {
  .footer .d-flex { width: 100%; justify-content: flex-end; flex-wrap: wrap; gap: 8px; }
}

/* Hero 下载按钮（暗色模式下的专属渐变） */
/* 下载按钮：更扁平化的渐变与弱化阴影 */
.hero-button-gradient {
  background: linear-gradient(180deg, rgb(160,115,238) 0%, rgb(110,37,237) 100%);
  color: #fff;
  border: 0;
  box-shadow: 0 6px 18px rgba(110,37,237,0.18);
}
.hero-button-gradient:hover { filter: brightness(1.04); }

/* 兼容现有粉系块：替换浅色背景为提升层 */
.pricing-section, .app-screenshots-section, .pain-points-section, .final-cta-section, .features-section, .testimonials-section, .faq-section, .how-it-works-section { background: var(--bg); }
.testimonial-card, .pricing-card, .screenshot-item, .pain-card { background: var(--bg-elevated); border-color: var(--line); }
.feature-icon, .pain-check, .feature-image-bg { background-color: rgba(167,139,250,0.12); color: #fff; }

/* 卡片/按钮中的强调色与描边 */
.pricing-badge { background: linear-gradient(90deg, var(--grad-start), var(--grad-end)); color: var(--text-strong); }
.carousel-control-prev, .carousel-control-next { background-color: rgba(21,16,35,0.7); border-color: var(--line); color: var(--glow); }
.btn-dark { background: linear-gradient(135deg, var(--grad-start), var(--grad-end)); border: 0; color: var(--text-strong); }
.btn-dark:hover { filter: brightness(1.06); }

/* Accordion & 分隔线 */
.accordion-item { border-color: var(--line); background: var(--bg-elevated); }
.accordion-button { color: var(--text); background-color: transparent; border-bottom: 1px solid var(--line); font-weight: 500; }
.accordion-button:hover { background-color: transparent; color: var(--text-strong); }
.accordion-button:not(.collapsed) { color: var(--text-strong); background-color: transparent; box-shadow: none; }
/* 白色箭头图标 */
.accordion-button::after { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='%23ffffff' viewBox='0 0 16 16'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e"); }

/* 分割线与边框统一 */
.screenshot-item, .pricing-card, .testimonial-card, .pain-card { box-shadow: var(--shadow-card); }

/* 使用步骤：圆形序号（紫系玻璃） */
.step-number {
  background: radial-gradient(closest-side, rgba(167,139,250,0.25), rgba(124,58,237,0.18));
  color: var(--text-strong);
  border: 1px solid rgba(167,139,250,0.4);
  box-shadow: 0 10px 30px rgba(124,58,237,0.25);
}

/* 下载按钮下说明文字（小字） */
.final-cta-section .small, .final-cta-section .text-muted {
  color: var(--text-subtle) !important;
}

/* Footer 语言选择器：与“下载”按钮同系的紫色光影胶囊效果 */
.footer .lang-dropdown .btn.lang-toggle {
  background:
    linear-gradient(180deg, #161127, #0F0B19) padding-box,
    linear-gradient(90deg, rgb(229,156,255) 0.01%, rgb(186,156,255) 50.01%, rgb(156,178,255) 100%) border-box;
  color: var(--text-strong);
  border: 1px solid transparent;
  border-radius: 9999px;
  padding: 6px 12px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.45), 0 0 0 1px rgba(255,255,255,0.06) inset;
  display: inline-flex; align-items: center; gap: 6px;
}
.footer .lang-dropdown .btn.lang-toggle .flag { font-size: 14px; }
.footer .lang-dropdown.dropup .dropdown-menu { bottom: 100%; transform: translateY(-6px); }
.footer .lang-dropdown .dropdown-menu { min-width: 150px; }
.footer .lang-dropdown .dropdown-item { display: flex; align-items: center; gap: 8px; }
.footer .lang-dropdown .dropdown-item .flag { font-size: 16px; }

/* 胶囊按钮：统一圆角与内边距 */
.btn, .btn-lg { border-radius: 9999px; }

/* 顶部导航的可辨识度与玻璃态 */
/* 滚动后：黑色透明磨砂玻璃背景 + 恢复分隔线 */
header.scrolled .navbar {
  background: linear-gradient(180deg, rgba(10,8,16,0.78), rgba(10,8,16,0.58));
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px) saturate(130%);
}
/* 顶部全局光源效果 */
header.fixed-top { position: fixed; z-index: 1000; }
/* 将光源放到 main 上，使其与内容区域一体化 */
main { position: relative; }
main::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -200px;
  transform: translateX(-50%);
  width: min(1800px, 120vw);
  height: 700px;
  pointer-events: none;
  background:
    radial-gradient(60% 60% at 50% 55%, rgba(167,139,250,0.22) 0%, rgba(167,139,250,0.08) 38%, transparent 72%),
    radial-gradient(50% 50% at 20% 50%, rgba(124,58,237,0.16) 0%, transparent 65%),
    radial-gradient(40% 40% at 80% 40%, rgba(110,37,237,0.12) 0%, transparent 60%),
    repeating-radial-gradient(circle at 50% 55%, rgba(255,255,255,0.04), rgba(255,255,255,0.04) 1px, transparent 2px, transparent 30px);
  filter: blur(18px) saturate(120%);
  opacity: 0.9;
}
.nav-link { color: var(--text-subtle); transition: color .2s, background .2s, box-shadow .2s; border-radius: 9999px; padding: 8px 14px; }
.nav-link:hover { color: var(--text-strong); background: rgba(167,139,250,0.08); }
.nav-link.active, .nav-link:focus { color: var(--text-strong); background: rgba(167,139,250,0.16); box-shadow: 0 0 0 1px rgba(167,139,250,0.25) inset, 0 8px 24px rgba(124,58,237,0.2); }

/* 导航栏：覆盖 bootstrap navbar-light 的黑色文字，放大内间距 */
.navbar.navbar-light .navbar-nav .nav-link { color: var(--text-subtle) !important; padding: 10px 18px; margin: 0 6px; }
.navbar.navbar-light .navbar-nav .nav-link:hover { color: var(--text-strong) !important; background: rgba(167,139,250,0.08); }
.navbar.navbar-light .navbar-nav .nav-link.active,
.navbar.navbar-light .navbar-nav .nav-link:focus { color: var(--text-strong) !important; background: rgba(167,139,250,0.16); box-shadow: 0 0 0 1px rgba(167,139,250,0.25) inset, 0 8px 24px rgba(124,58,237,0.2); }
.navbar.navbar-light .navbar-brand { color: var(--text-strong) !important; }

/* 移动端折叠菜单按钮（颜色与位置） */
.navbar .navbar-toggler {
  margin-left: auto;
  border: 1px solid rgba(255,255,255,0.25);
  background-color: rgba(255,255,255,0.03);
  border-radius: 8px;
  padding: .25rem .5rem;
}
.navbar .navbar-toggler:focus { box-shadow: var(--ring); }
.navbar .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3e%3cpath stroke='rgba(255,255,255,0.95)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 焦点可达性 */
button:focus, a:focus { outline: none; box-shadow: var(--ring); }

/* 视频容器：改用与订阅卡一致的紫色渐变描边 */
.hero-section .video-container,
.hero-section .hero-slider {
  /* 使用主题描边变量，统一视频与图集容器的边线 */
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
}
.hero-section .video-overlay { background: linear-gradient(135deg, rgba(167,139,250,0.20), rgba(124,58,237,0.08)); }

.feature-content p, .step-item p {
    color: var(--text-subtle);
}

/* Features 图示容器与图片：去掉 overlay 的 inset，并给图片添加淡淡的统一阴影 */
.features-section .feature-image-overlay { display: none; }
.features-section .feature-image-container { padding: 2rem; overflow: visible; }
.features-section .feature-image-frame {
  /* 新增的外围框：承载发光边线与柔和阴影，尺寸贴合图片 */
  position: relative;
  z-index: 15;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  display: grid; /* 让多张图重叠且保持容器高度由内容撑开 */
  border-radius: 24px;
  background: var(--glow-surface-a), var(--glow-surface-b), var(--glow-surface-overlay);
  border: 1px solid var(--border-glow);
  box-shadow: var(--shadow-card-glow-feather), var(--shadow-card-glow-soft), var(--shadow-card-halo), var(--shadow-card-base);
  overflow: visible;
}
.features-section .feature-image { border-radius: 24px; box-shadow: none; }

/* 更加“交融”的切换：在暗色下提升层叠的观感（可选） */
.features-section .feature-image-frame img { grid-area: 1 / 1; mix-blend-mode: normal; backface-visibility: hidden; }

/* FAQ 容器内间距与卡片化 */
.faq-section .accordion {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px 16px;
  box-shadow: var(--shadow-card);
}
.faq-section .accordion-item { margin: 6px 0; border: 1px solid transparent; border-bottom: 1px solid var(--line); }

/* 导航选中态的内边距更舒适 */
.nav-link.active, .nav-link:focus { padding: 10px 18px; }

.carousel-control-prev:hover, .carousel-control-next:hover {
  color: var(--text-strong);
}

/* 订阅卡片：参考风格（渐变底、描边、按钮、行标、价格） */
.pricing-card {
  /* 订阅卡片：使用统一的淡紫发光背景与描边/阴影变量 */
  background: var(--glow-surface-a), var(--glow-surface-b), var(--glow-surface-overlay);
  border: 1px solid var(--border-glow);
  border-radius: 24px;
  box-shadow: var(--shadow-card-glow-feather), var(--shadow-card-glow-soft), var(--shadow-card-halo), var(--shadow-card-base);
}
.pricing-card-featured {
  /* 推荐卡片：更强的边框与紫色光晕 */
  border-color: var(--border-glow-strong);
  box-shadow: var(--shadow-card-glow-feather), var(--shadow-card-glow-strong), var(--shadow-card-halo), var(--shadow-card-base);
}
.pricing-header h3 { color: var(--text-strong); }
.pricing-description { color: var(--text); }
.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  background: -webkit-linear-gradient(0deg, rgb(229, 156, 255) 0.01%, rgb(186, 156, 255) 50.01%, rgb(156, 178, 255) 100%);
  background: linear-gradient(90deg, rgb(229, 156, 255) 0.01%, rgb(186, 156, 255) 50.01%, rgb(156, 178, 255) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; color: transparent;
}
.pricing-price span { color: var(--text-subtle); }

/* 订阅按钮：胶囊紫渐变 */
/* 订阅按钮：深色填充 + 渐变描边（与“下载按钮”风格区分） */
.pricing-card .pricing-footer .btn {
  /* 深色填充 + 多色渐变描边（贴近参考） */
  background:
    linear-gradient(180deg, #161127, #0F0B19) padding-box,
    linear-gradient(90deg, rgb(229,156,255) 0.01%, rgb(186,156,255) 50.01%, rgb(156,178,255) 100%) border-box;
  color: var(--text-strong);
  border: 1px solid transparent;
  border-radius: 9999px;
  padding: 12px 22px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.45), 0 0 0 1px rgba(255,255,255,0.06) inset;
}
.pricing-card .pricing-footer .btn:hover {
  background:
    linear-gradient(180deg, #19122E, #110D21) padding-box,
    linear-gradient(90deg, rgb(229,156,255) 0.01%, rgb(186,156,255) 50.01%, rgb(156,178,255) 100%) border-box;
  box-shadow: 0 14px 40px rgba(124,58,237,0.30), 0 0 0 1px rgba(255,255,255,0.10) inset;
}

/* 行标样式（圆形描边 + 轻光） */
.pricing-features .feature-check {
  background: transparent;
  color: var(--glow);
  border: 1px solid rgba(167,139,250,0.38);
  border-radius: 50%;
  box-shadow: none;
  position: relative;
}
.pricing-features .feature-check i { display: none; }
.pricing-features .feature-check::before {
  content: "\f192"; /* Font Awesome: dot-circle */
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  font-size: 0.3rem;
  line-height: 1;
  position: absolute;
  top: 50%; left: 50%; transform: translate(-50%, -50%);
  color: #fff;
}
.pricing-features li span { color: var(--text); }

/* 价格标题与分隔线 */
.pricing-header { border-bottom: 1px solid rgba(255,255,255,0.06); }
.pricing-price { letter-spacing: -0.02em; }
.pricing-save { color: var(--glow); }

footer .text-muted {
  color: var(--text) !important;
}

/* 统一：痛点卡、口碑卡、FAQ 容器、顶部视频/图集容器采用与订阅卡一致的高级发光背景 */
.pain-card,
.testimonial-card,
.screenshot-item,
.faq-section .accordion,
.hero-section .video-container,
.hero-section .hero-slider {
  /* 背景与描边（与订阅卡一致） */
  background: var(--glow-surface-a), var(--glow-surface-b), var(--glow-surface-overlay) !important;
  border: 1px solid var(--border-glow) !important;
  /* 淡紫色发光 + 基础升起阴影叠加，统一质感 */
  box-shadow: var(--shadow-card-glow-feather), var(--shadow-card-glow-soft), var(--shadow-card-halo), var(--shadow-card-base) !important;
}

/* Footer 漂浮水印（温和、稀疏、低透明） */
.footer {
  position: relative;
  /* overflow: hidden; */
}
.footer-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.22; /* 约 20% */
  filter: blur(0.1px);
  overflow: hidden;
}
.footer-decor .fa {
  position: absolute;
  color: rgba(255,255,255,0.9);
  will-change: transform, opacity;
  animation: footerFloat var(--fdur, 18s) ease-in-out infinite;
  opacity: var(--fopa, 0.22);
}
@keyframes footerFloat {
  0% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-14px) rotate(6deg); }
  100% { transform: translateY(0) rotate(0deg); }
}

/* FAQ 单项条目仍保持分隔线风格，但容器外观统一为发光卡片 */
.faq-section .accordion-item { background: transparent; }

/* 用户评价卡片间距：增大左右留白，同时保持 3/2/1 列自适应 */
.testimonial-card {
  width: calc(33.333% - 24px);
  margin: 0 12px 30px;
}
@media (max-width: 991.98px) {
  .testimonial-card { width: calc(50% - 24px); margin: 0 12px 24px; }
}
@media (max-width: 767.98px) {
  .testimonial-card { width: calc(100% - 24px); margin: 0 12px 20px; }
}