/* ====================================================================
   一翻云 (yifanyun.org) - 核心样式表 (style.css)
   风格：全景极速旭日橙与流光云端高转化风 (Full-Canvas Radiant Solar Orange Aurora)
   特性：全图动静态背景融合、全谱系多层次橙、磨砂玻璃态、极速加载、零外部字体
==================================================================== */

:root {
  /* ================= 全谱系多层次橙色系统 ================= */
  --orange-neon: #ff5500;             /* 电光霓虹橙 (最高能焦点) */
  --orange-flame: #ff6b00;            /* 烈焰暖橙 (主 CTA 渐变起点) */
  --color-primary: #ea580c;           /* 活力旭日橙 (品牌主色) */
  --color-primary-hover: #c2410c;     /* 熔岩深橙 (悬停深色) */
  --orange-amber: #f59e0b;            /* 暖曜琥珀金 (高光微标) */
  --orange-gold: #fbbf24;             /* 晨曦金辉 (点阵与星芒) */
  --orange-cinnamon: #9a3412;         /* 浓醇肉桂深橙 (高对比度辅文) */
  
  /* 橙系微光浅底与边框 */
  --color-primary-light: #fff7ed;     /* 柔和橙雾底色 */
  --color-primary-subtle: #fffaf5;    /* 极浅玉白暖底 */
  --color-primary-border: #fed7aa;    /* 亮橙精致边框 */
  --color-border-glow: #fdba74;       /* 悬停高光发散边框 */
  --color-primary-glow: rgba(234, 88, 12, 0.28);
  --color-neon-glow: rgba(255, 85, 0, 0.38);

  /* 辅助互补晴空蓝与翡翠绿 */
  --color-secondary-blue: #0284c7;    /* 晴空海蓝 (互补冷调) */
  --color-secondary-light: #f0f9ff;
  --color-secondary-border: #bae6fd;
  --color-success: #10b981;           /* 实时健康绿 */
  --color-success-bg: #ecfdf5;

  /* 文字高对比度 (严格满足 WCAG AA 4.5:1 无障碍要求) */
  --color-text-main: #0f172a;         /* 深岩黑 (主标题与核心文字) */
  --color-text-muted: #334155;        /* 次级正文 (深铅灰) */
  --color-text-sub: #64748b;          /* 辅助说明 */

  /* 页面底色与卡片 */
  --color-bg-body: #fffaf5;
  --color-bg-card: rgba(255, 255, 255, 0.92);
  --color-border: #f1f5f9;
  --color-tag-bg: #fff7ed;
  --color-tag-text: #9a3412;

  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1160px;
  --max-article-width: 840px;
  --border-radius: 16px;
  --border-radius-sm: 8px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px -4px rgba(234, 88, 12, 0.12), 0 2px 8px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 48px -6px rgba(234, 88, 12, 0.22), 0 4px 16px -2px rgba(0, 0, 0, 0.06);
}

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

html {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg-body);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

/* ================= 全图动静态融合背景 ================= */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-color: #fffaf5;
  background-image:
    radial-gradient(ellipse 90% 55% at 50% -10%, rgba(255, 107, 0, 0.18), transparent 70%),
    radial-gradient(circle at 10% 35%, rgba(245, 158, 11, 0.09), transparent 35%),
    radial-gradient(circle at 90% 60%, rgba(234, 88, 12, 0.11), transparent 40%),
    url('bg-aurora-mesh.svg');
  background-attachment: fixed;
  background-size: cover;
  background-position: top center;
  background-repeat: no-repeat;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* ================= Accessibility & Focus ================= */
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 2px solid var(--orange-neon);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.article-container {
  width: 100%;
  max-width: var(--max-article-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ================= Header (高级磨砂玻璃 + 亮橙微边框) ================= */
.site-header {
  background-color: rgba(255, 250, 245, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(254, 215, 170, 0.7);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(234, 88, 12, 0.05);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 850;
  color: var(--color-text-main);
  text-decoration: none !important;
  letter-spacing: -0.025em;
}

.brand-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--orange-flame) 0%, var(--color-primary) 50%, var(--color-primary-hover) 100%);
  color: #ffffff;
  border-radius: 10px;
  font-size: 18px;
  font-weight: 850;
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.4);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.brand-logo:hover .brand-logo-mark {
  transform: rotate(8deg) scale(1.1);
  box-shadow: 0 6px 18px rgba(234, 88, 12, 0.55);
}

.mobile-menu-btn {
  display: none;
  background: #ffffff;
  border: 1px solid var(--color-primary-border);
  border-radius: 8px;
  width: 44px;
  height: 44px;
  padding: 10px;
  cursor: pointer;
  color: var(--color-text-main);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.mobile-menu-btn:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
}

.mobile-menu-btn svg {
  width: 22px;
  height: 22px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  color: var(--color-text-muted);
  font-weight: 650;
  font-size: 15px;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  text-decoration: none;
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--orange-flame) 0%, var(--color-primary) 100%);
  color: #ffffff !important;
  font-weight: 750;
  font-size: 14px;
  border-radius: 9px;
  text-decoration: none !important;
  box-shadow: 0 3px 12px rgba(234, 88, 12, 0.35);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(234, 88, 12, 0.5);
}

/* ================= Buttons 与倾角流光微动效 ================= */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 34px;
  background: linear-gradient(135deg, var(--orange-neon) 0%, var(--orange-flame) 45%, var(--color-primary) 100%);
  color: #ffffff !important;
  font-size: 16px;
  font-weight: 800;
  border-radius: var(--border-radius);
  text-decoration: none !important;
  transition: var(--transition);
  border: 1px solid rgba(255, 85, 0, 0.6);
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.4);
  position: relative;
  overflow: hidden;
}

/* 动感扫光流光 */
.btn-primary::after {
  content: "";
  position: absolute;
  top: -60%;
  left: -70%;
  width: 50%;
  height: 220%;
  background: linear-gradient(
    65deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.45) 50%,
    rgba(255, 255, 255, 0) 100%
  );
  transform: rotate(25deg);
  animation: cta-shine 3s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes cta-shine {
  0% { left: -70%; opacity: 0; }
  15% { opacity: 0.9; }
  35% { left: 150%; opacity: 0; }
  100% { left: 150%; opacity: 0; }
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 28px rgba(234, 88, 12, 0.52);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 32px;
  background-color: rgba(255, 255, 255, 0.95);
  color: var(--color-text-main) !important;
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--border-radius);
  text-decoration: none !important;
  transition: var(--transition);
  border: 1.5px solid var(--color-primary-border);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  color: var(--color-primary) !important;
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.btn-block {
  width: 100%;
}

/* ================= 动态脉冲光点与状态光环 ================= */
.pulse-indicator {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--orange-neon);
  box-shadow: 0 0 0 0 rgba(255, 85, 0, 0.8);
  animation: pulse-ring-solar 2s infinite cubic-bezier(0.455, 0.03, 0.515, 0.955);
  margin-right: 8px;
  vertical-align: middle;
}

@keyframes pulse-ring-solar {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 85, 0, 0.8);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(255, 85, 0, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 85, 0, 0);
  }
}

.hero-live-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 22px;
  background: rgba(255, 255, 255, 0.95);
  border: 1.5px solid var(--color-primary-border);
  border-radius: 30px;
  font-size: 13.5px;
  font-weight: 750;
  color: #c2410c;
  margin-bottom: 24px;
  box-shadow: 0 4px 16px rgba(234, 88, 12, 0.15);
  animation: float-subtle 4.5s ease-in-out infinite alternate;
}

@keyframes float-subtle {
  0% { transform: translateY(0); }
  100% { transform: translateY(-5px); }
}

/* ================= Hero Section (全景极光微晕) ================= */
.hero-section {
  padding: 72px 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-title {
  font-size: 46px;
  line-height: 1.22;
  font-weight: 850;
  color: var(--color-text-main);
  max-width: 860px;
  margin: 0 auto 22px;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 19.5px;
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto 38px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-highlights {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
  font-size: 14.5px;
  font-weight: 650;
  color: var(--color-text-muted);
  margin-bottom: 44px;
}

.highlight-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.95);
  padding: 9px 20px;
  border-radius: 24px;
  border: 1.5px solid var(--color-primary-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.highlight-item:hover {
  transform: translateY(-3px);
  border-color: var(--orange-flame);
  box-shadow: 0 6px 16px rgba(234, 88, 12, 0.16);
}

.highlight-item svg {
  width: 17px;
  height: 17px;
  color: var(--orange-flame);
  fill: currentColor;
}

/* ================= Hero 图片挂载区 (立体发光玻璃态框) ================= */
.hero-image-wrap {
  max-width: 820px;
  margin: 0 auto 44px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 20px 60px -12px rgba(234, 88, 12, 0.22), 0 0 0 1px rgba(254, 215, 170, 0.8);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  position: relative;
  transition: var(--transition);
}

.hero-image-wrap:hover {
  transform: translateY(-6px) scale(1.008);
  box-shadow: 0 26px 70px -10px rgba(234, 88, 12, 0.3), 0 0 0 2px var(--orange-flame);
}

.hero-image-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

/* ================= 实时节点看板 (Glassmorphism 监控台) ================= */
.node-dashboard-wrap {
  max-width: 900px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  border: 1.5px solid var(--color-primary-border);
  border-radius: var(--border-radius);
  padding: 26px 28px;
  box-shadow: var(--shadow-lg);
  text-align: left;
}

.node-dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
  gap: 12px;
}

.node-dashboard-title {
  font-size: 16.5px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-main);
}

.node-refresh-btn {
  font-size: 13.5px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1.5px solid var(--color-primary-border);
  padding: 7px 16px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 750;
  transition: var(--transition);
}

.node-refresh-btn:hover {
  background: #ffedd5;
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.node-grid-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.node-item-card {
  background: rgba(255, 250, 245, 0.85);
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  padding: 16px 18px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.node-item-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--orange-flame);
  opacity: 0;
  transition: opacity 0.2s;
}

.node-item-card:hover {
  border-color: var(--color-primary-border);
  transform: translateY(-4px);
  background: #ffffff;
  box-shadow: var(--shadow-md);
}

.node-item-card:hover::before {
  opacity: 1;
}

.node-name {
  font-size: 13.5px;
  font-weight: 750;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.node-ping-val {
  font-size: 22px;
  font-weight: 850;
  color: var(--orange-flame);
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.node-ping-val small {
  font-size: 11px;
  color: var(--color-text-sub);
  font-weight: normal;
}

.node-type-tag {
  font-size: 11.5px;
  color: var(--color-success);
  font-weight: 650;
  margin-top: 5px;
}

/* ================= Section Base ================= */
.section-padding {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 52px;
}

.section-title {
  font-size: 34px;
  font-weight: 850;
  color: var(--color-text-main);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 17.5px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ================= Support Matrix ================= */
.matrix-section {
  position: relative;
  border-top: 1px solid rgba(254, 215, 170, 0.4);
  border-bottom: 1px solid rgba(254, 215, 170, 0.4);
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 26px;
}

.matrix-card {
  padding: 30px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border: 1.5px solid rgba(254, 215, 170, 0.5);
  border-radius: var(--border-radius);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.matrix-card:hover {
  border-color: var(--orange-flame);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  background: #ffffff;
}

.matrix-icon-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.matrix-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
  color: var(--orange-flame);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1.5px solid var(--color-primary-border);
}

.matrix-icon-box svg {
  width: 24px;
  height: 24px;
}

.matrix-title {
  font-size: 19px;
  font-weight: 800;
  color: var(--color-text-main);
}

.matrix-text {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ================= Features Grid ================= */
.features-section {
  position: relative;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.feature-card {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border: 1.5px solid rgba(254, 215, 170, 0.5);
  border-radius: var(--border-radius);
  padding: 36px 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  border-color: var(--orange-flame);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.feature-badge-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, #fff7ed 0%, #fed7aa 100%);
  color: var(--orange-flame);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1.5px solid var(--color-primary-border);
}

.feature-card-title {
  font-size: 21px;
  font-weight: 800;
  color: var(--color-text-main);
}

.feature-card-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* ================= Scenarios ================= */
.scenarios-section {
  position: relative;
  border-top: 1px solid rgba(254, 215, 170, 0.4);
  border-bottom: 1px solid rgba(254, 215, 170, 0.4);
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.scenario-card {
  border: 1.5px solid rgba(254, 215, 170, 0.5);
  border-radius: var(--border-radius);
  padding: 34px 28px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.scenario-card:hover {
  border-color: var(--orange-flame);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  background-color: #ffffff;
}

.scenario-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 5px 14px;
  background-color: var(--color-primary-light);
  color: var(--orange-flame);
  font-size: 12.5px;
  font-weight: 800;
  border-radius: 6px;
  border: 1.5px solid var(--color-primary-border);
  margin-bottom: 18px;
}

.scenario-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 8px;
}

.scenario-device {
  font-size: 13.5px;
  color: #c2410c;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.scenario-desc {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-top: auto;
}

/* ================= Pricing ================= */
.pricing-section {
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-card {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border: 1.5px solid rgba(254, 215, 170, 0.6);
  border-radius: var(--border-radius);
  padding: 40px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  border-color: var(--orange-flame);
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.pricing-card.featured {
  border: 2.5px solid var(--orange-flame);
  box-shadow: 0 16px 44px rgba(234, 88, 12, 0.22);
  background: linear-gradient(180deg, #fff7ed 0%, #ffffff 30%);
}

.pricing-featured-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--orange-neon) 0%, var(--orange-flame) 100%);
  color: #ffffff;
  font-size: 12.5px;
  font-weight: 850;
  padding: 5px 20px;
  border-radius: 20px;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 14px rgba(234, 88, 12, 0.45);
}

.pricing-card-name {
  font-size: 23px;
  font-weight: 850;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.pricing-card-target {
  font-size: 13.5px;
  color: var(--color-text-sub);
  margin-bottom: 24px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1.5px solid var(--color-border);
}

.pricing-currency {
  font-size: 24px;
  font-weight: 750;
  color: var(--color-text-main);
}

.pricing-amount {
  font-size: 48px;
  font-weight: 900;
  color: var(--orange-flame);
  line-height: 1;
}

.pricing-period {
  font-size: 14.5px;
  color: var(--color-text-muted);
}

.pricing-features-list {
  list-style: none;
  margin-bottom: 34px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14.5px;
  color: var(--color-text-muted);
  margin-bottom: 15px;
  line-height: 1.55;
}

.pricing-feature-item svg {
  width: 19px;
  height: 19px;
  color: var(--orange-flame);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ================= FAQ ================= */
.faq-section {
  position: relative;
  border-top: 1px solid rgba(254, 215, 170, 0.4);
  border-bottom: 1px solid rgba(254, 215, 170, 0.4);
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1.5px solid var(--color-border);
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--color-primary-border);
  background-color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 22px 26px;
  font-size: 16.5px;
  font-weight: 800;
  color: var(--color-text-main);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 24px;
  font-weight: 400;
  color: var(--orange-flame);
  margin-left: 12px;
  line-height: 1;
}

details[open] .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 26px 22px;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* ================= Final CTA (暖黑炭夜空与放射橙云) ================= */
.final-cta-section {
  background: linear-gradient(135deg, #18181b 0%, #27272a 100%);
  color: #ffffff;
  padding: 82px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta-section::before {
  content: "";
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 350px;
  background: radial-gradient(ellipse at center, rgba(255, 107, 0, 0.32) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
}

.final-cta-title {
  font-size: 36px;
  font-weight: 850;
  color: #ffffff;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  position: relative;
}

.final-cta-desc {
  font-size: 17.5px;
  color: #e4e4e7;
  max-width: 660px;
  margin: 0 auto 36px;
  line-height: 1.7;
  position: relative;
}

.final-cta-actions {
  display: flex;
  justify-content: center;
  gap: 18px;
  position: relative;
}

/* ================= Footer ================= */
.site-footer {
  background-color: #0c0a09;
  color: #a8a29e;
  padding: 60px 0 30px;
  font-size: 14px;
  border-top: 1px solid #292524;
  margin-top: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 44px;
}

.footer-brand-title {
  font-size: 20px;
  font-weight: 850;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #a8a29e;
  max-width: 320px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: #a8a29e;
  text-decoration: none;
}

.footer-link:hover {
  color: var(--orange-flame);
}

.footer-bottom {
  padding-top: 26px;
  border-top: 1px solid #292524;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

.footer-affiliate-note {
  max-width: 680px;
  line-height: 1.6;
}

/* ================= Mobile Sticky CTA ================= */
.mobile-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 250, 245, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1.5px solid var(--color-primary-border);
  padding: 12px 18px;
  z-index: 999;
  box-shadow: 0 -6px 20px rgba(234, 88, 12, 0.16);
  opacity: 0;
  pointer-events: none;
  transform: translateY(100%);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.mobile-sticky-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mobile-sticky-info {
  font-size: 14.5px;
  font-weight: 800;
  color: var(--color-text-main);
  line-height: 1.3;
}

.mobile-sticky-info small {
  display: block;
  font-size: 11px;
  color: var(--color-text-sub);
  font-weight: normal;
}

.mobile-sticky-btn {
  padding: 11px 24px;
  font-size: 14px;
  white-space: nowrap;
}

/* ================= Back to top Button ================= */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #ffffff;
  border: 1.5px solid var(--color-primary-border);
  box-shadow: var(--shadow-md);
  color: var(--orange-flame);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: var(--transition);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-light);
  border-color: var(--orange-flame);
  transform: scale(1.12);
  box-shadow: var(--shadow-lg);
}

.back-to-top svg {
  width: 21px;
  height: 21px;
}

/* ================= Article / Guide Layout ================= */
.article-header {
  padding: 50px 0 26px;
  border-bottom: 1.5px solid var(--color-border);
  margin-bottom: 38px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--color-text-sub);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--orange-flame);
}

.article-title {
  font-size: 33px;
  line-height: 1.3;
  font-weight: 850;
  color: var(--color-text-main);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13.5px;
  color: var(--color-text-sub);
  flex-wrap: wrap;
}

.article-content {
  font-size: 16.5px;
  line-height: 1.85;
  color: #1e293b;
  margin-bottom: 48px;
}

.article-content h2 {
  font-size: 25px;
  font-weight: 800;
  color: var(--color-text-main);
  margin-top: 46px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2.5px solid var(--color-primary-border);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 750;
  color: var(--color-text-main);
  margin-top: 30px;
  margin-bottom: 14px;
}

.article-content p {
  margin-bottom: 22px;
}

.article-content ul, .article-content ol {
  margin-bottom: 26px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 9px;
}

.article-callout {
  background-color: var(--color-primary-light);
  border-left: 4.5px solid var(--orange-flame);
  padding: 20px 24px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin: 28px 0;
  font-size: 15px;
  color: var(--orange-cinnamon);
  box-shadow: var(--shadow-sm);
}

.article-callout-title {
  font-weight: 800;
  margin-bottom: 6px;
}

.article-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 30px 0;
  box-shadow: var(--shadow-sm);
  border-radius: var(--border-radius);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14.5px;
  background-color: #ffffff;
  border: 1.5px solid var(--color-border);
}

.article-table th {
  background-color: #fff7ed;
  font-weight: 800;
  color: var(--color-text-main);
  padding: 15px 18px;
  border-bottom: 1.5px solid var(--color-primary-border);
}

.article-table td {
  padding: 15px 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-table tr:hover td {
  background-color: #fffbf5;
}

.article-cta-box {
  background: linear-gradient(135deg, #fff7ed 0%, #ffffff 100%);
  border: 1.5px solid var(--color-primary-border);
  border-radius: var(--border-radius);
  padding: 36px 30px;
  text-align: center;
  margin: 46px 0;
  box-shadow: var(--shadow-md);
}

.article-cta-title {
  font-size: 23px;
  font-weight: 850;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.article-cta-desc {
  font-size: 15.5px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 24px;
}

.related-articles {
  margin-top: 50px;
  padding-top: 34px;
  border-top: 1.5px solid var(--color-border);
}

.related-articles-title {
  font-size: 21px;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 22px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  display: block;
  padding: 22px 24px;
  background-color: #ffffff;
  border: 1.5px solid var(--color-border);
  border-radius: var(--border-radius);
  text-decoration: none !important;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.related-card:hover {
  border-color: var(--color-primary-border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.related-card-title {
  font-size: 16.5px;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.related-card-desc {
  font-size: 13.5px;
  color: var(--color-text-sub);
}

/* ================= Standard Static Pages (About, Terms, etc.) ================= */
.static-page-section {
  padding: 50px 0 68px;
}

.static-page-header {
  margin-bottom: 34px;
  padding-bottom: 18px;
  border-bottom: 1.5px solid var(--color-border);
}

.static-page-title {
  font-size: 33px;
  font-weight: 850;
  color: var(--color-text-main);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.static-page-meta {
  font-size: 13.5px;
  color: var(--color-text-sub);
}

.static-content h2 {
  font-size: 23px;
  font-weight: 800;
  color: var(--color-text-main);
  margin-top: 38px;
  margin-bottom: 16px;
}

.static-content p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.static-content ul {
  padding-left: 20px;
  margin-bottom: 22px;
}

.static-content li {
  font-size: 15.5px;
  color: var(--color-text-muted);
  margin-bottom: 9px;
  line-height: 1.7;
}

/* ================= Responsive Queries ================= */
@media (max-width: 900px) {
  .hero-title {
    font-size: 36px;
  }
  .features-grid, .scenarios-grid, .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.featured {
    order: -1;
  }
  .node-grid-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }
  .header-inner {
    height: 62px;
    position: relative;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: -20px;
    right: -20px;
    background-color: #ffffff;
    border-bottom: 1.5px solid var(--color-primary-border);
    flex-direction: column;
    align-items: stretch;
    padding: 20px 24px;
    gap: 10px;
    box-shadow: 0 16px 32px rgba(234, 88, 12, 0.12);
  }
  .main-nav.nav-open {
    display: flex;
  }
  .main-nav .nav-link {
    display: block;
    padding: 12px 0;
    font-size: 16px;
    border-bottom: 1px solid var(--color-border);
  }
  .main-nav .nav-cta-btn {
    margin-top: 10px;
    text-align: center;
    padding: 14px;
    width: 100%;
  }
  .hero-section {
    padding: 50px 0 42px;
  }
  .hero-title {
    font-size: 29px;
  }
  .hero-subtitle {
    font-size: 16px;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn-primary, .btn-secondary {
    width: 100%;
  }
  .node-grid-list {
    grid-template-columns: 1fr 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 26px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .mobile-sticky-cta {
    display: block;
  }
  .mobile-sticky-cta.is-active {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  body {
    padding-bottom: 64px;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
}