/* ==================================================
   扬帆云（YFCloud）- 「深海航行」极简深色未来感样式表
   Deep-Sea Cyber Tech Theme (Dark Futuristic Edition)
   ================================================== */

/* ===========================
   设计系统与色彩变量
   =========================== */
:root {
  --bg-deep: #06080F;              /* 深渊黑底色 */
  --bg-surface: #0B1120;           /* 深海蓝基底 */
  --bg-card: rgba(13, 22, 41, 0.75); /* 深海玻态卡片 */
  --bg-card-hover: rgba(18, 30, 56, 0.9);
  --border-subtle: rgba(0, 242, 254, 0.14);
  --border-glow: rgba(0, 242, 254, 0.4);
  --primary-cyan: #00F2FE;         /* 荧光青碧主光色 */
  --primary-blue: #0284C7;         /* 极深海蓝 */
  --electric-blue: #38BDF8;        /* 电光天蓝 */
  --accent-emerald: #10B981;       /* 信号绿 */
  --accent-gold: #F59E0B;          /* 推荐金 */
  --text-primary: #F8FAFC;         /* 耀白主文本 */
  --text-secondary: #94A3B8;       /* 幽蓝次级文本 */
  --text-muted: #64748B;           /* 弱化文本 */
  --glow-shadow: 0 0 25px rgba(0, 242, 254, 0.25);
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
}

/* ===========================
   全局基础重置与背景设定
   =========================== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  background-color: var(--bg-deep);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 242, 254, 0.08) 0%, transparent 55%),
    radial-gradient(circle at 85% 35%, rgba(2, 132, 199, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 15% 75%, rgba(16, 185, 129, 0.06) 0%, transparent 45%),
    linear-gradient(180deg, #06080F 0%, #080D1A 50%, #06080F 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
  line-height: 1.65;
}

/* 霓虹渐变文本 */
.text-gradient {
  background: linear-gradient(135deg, #FFFFFF 0%, #E0F2FE 40%, #00F2FE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-cyan {
  background: linear-gradient(135deg, #00F2FE 0%, #38BDF8 50%, #818CF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-cyan {
  color: var(--primary-cyan) !important;
}

.text-cyan-light {
  color: var(--electric-blue) !important;
}

.text-secondary-cyan {
  color: var(--text-secondary) !important;
}

/* ===========================
   深海悬浮导航栏
   =========================== */
.navbar-cyber {
  background: rgba(6, 8, 15, 0.82) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
  z-index: 1030;
}

.navbar-cyber .navbar-brand img {
  filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.35));
  transition: transform 0.25s ease;
}

.navbar-cyber .navbar-brand:hover img {
  transform: scale(1.04);
}

.navbar-cyber .nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 1rem !important;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  position: relative;
}

.navbar-cyber .nav-link:hover,
.navbar-cyber .nav-link:focus {
  color: var(--primary-cyan) !important;
  background: rgba(0, 242, 254, 0.08);
}

.navbar-cyber .nav-link::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 18px;
  height: 2px;
  background: var(--primary-cyan);
  box-shadow: 0 0 8px var(--primary-cyan);
  transition: transform 0.2s ease;
  border-radius: 2px;
}

.navbar-cyber .nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* 移动端汉堡按钮 */
.navbar-cyber .navbar-toggler {
  border: 1px solid var(--border-subtle);
  background: rgba(13, 22, 41, 0.6);
  color: var(--primary-cyan);
  padding: 0.4rem 0.65rem;
  border-radius: 0.5rem;
}

.navbar-cyber .navbar-toggler:focus {
  box-shadow: 0 0 0 3px rgba(0, 242, 254, 0.25);
}

.navbar-cyber .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0, 242, 254, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2.2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 移动端抽屉菜单 */
.offcanvas-cyber {
  background: #090E1A !important;
  border-left: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.offcanvas-cyber .offcanvas-header {
  border-bottom: 1px solid rgba(0, 242, 254, 0.12);
}

.offcanvas-cyber .btn-close {
  filter: invert(1) hue-rotate(180deg);
}

/* ===========================
   按钮系统（未来感赛博光效）
   =========================== */
.btn-cyber-primary {
  background: linear-gradient(135deg, #00F2FE 0%, #0284C7 100%);
  color: #06080F !important;
  font-weight: 700;
  border: none;
  border-radius: 0.6rem;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.35);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
}

.btn-cyber-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.6), 0 4px 15px rgba(2, 132, 199, 0.4);
  color: #000 !important;
}

.btn-cyber-outline {
  background: rgba(13, 22, 41, 0.6);
  border: 1px solid var(--primary-cyan);
  color: var(--primary-cyan) !important;
  font-weight: 600;
  border-radius: 0.6rem;
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.12);
  transition: all 0.25s ease;
}

.btn-cyber-outline:hover {
  background: rgba(0, 242, 254, 0.15);
  color: #FFF !important;
  box-shadow: 0 0 22px rgba(0, 242, 254, 0.35);
  transform: translateY(-2px);
}

.btn-cyber-glow {
  background: linear-gradient(135deg, #00F2FE 0%, #38BDF8 50%, #0284C7 100%);
  color: #050B17 !important;
  font-weight: 700;
  border: none;
  border-radius: 0.75rem;
  box-shadow: 0 0 25px rgba(0, 242, 254, 0.45);
  transition: all 0.25s ease;
  position: relative;
}

.btn-cyber-glow:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 40px rgba(0, 242, 254, 0.75);
  color: #000 !important;
}

/* ===========================
   首屏视觉区（Hero Section）
   =========================== */
.hero-cyber {
  padding: 6rem 0 5rem;
  position: relative;
  overflow: hidden;
}

/* 背景声呐波纹动态光晕 */
.hero-cyber::before {
  content: "";
  position: absolute;
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, rgba(2, 132, 199, 0.05) 45%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  animation: pulse-sonar 8s infinite alternate ease-in-out;
}

@keyframes pulse-sonar {
  0% { transform: translateX(-50%) scale(0.9); opacity: 0.7; }
  100% { transform: translateX(-50%) scale(1.2); opacity: 1; }
}

.badge-cyber-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(13, 22, 41, 0.8);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: var(--primary-cyan);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.45rem 1.15rem;
  border-radius: 9999px;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
  margin-bottom: 1.75rem;
}

.beacon-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: blink 2s infinite ease-in-out;
}

@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.75); }
}

/* 核心特性胶囊标签群 */
.hero-feature-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.hero-tag {
  background: rgba(11, 17, 32, 0.7);
  border: 1px solid rgba(0, 242, 254, 0.15);
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 0.35rem 0.85rem;
  border-radius: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-tag i {
  color: var(--primary-cyan);
}

/* ===========================
   实时网络拓扑/监控仪表盘（Hero 嵌入卡片）
   =========================== */
.radar-panel {
  background: rgba(11, 17, 32, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(0, 242, 254, 0.2);
  margin-top: 3.5rem;
  position: relative;
  z-index: 1;
}

.radar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.node-item {
  background: rgba(13, 22, 41, 0.6);
  border: 1px solid rgba(0, 242, 254, 0.1);
  border-radius: 0.75rem;
  padding: 1rem;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-item:hover {
  background: rgba(18, 30, 56, 0.8);
  border-color: rgba(0, 242, 254, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(0, 242, 254, 0.12);
}

.node-ping {
  color: var(--accent-emerald);
  font-family: monospace;
  font-weight: 700;
  font-size: 0.95rem;
}

/* ===========================
   深海机能卡片通用样式（Card System）
   =========================== */
.cyber-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  height: 100%;
}

.cyber-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 242, 254, 0.6), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.cyber-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-6px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 242, 254, 0.18);
}

.cyber-card:hover::before {
  opacity: 1;
}

/* 特性图标底座 */
.icon-box-cyber {
  width: 68px;
  height: 68px;
  border-radius: 1rem;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
  transition: all 0.3s ease;
}

.cyber-card:hover .icon-box-cyber {
  background: rgba(0, 242, 254, 0.18);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.4);
  transform: scale(1.08) rotate(2deg);
}

/* ===========================
   价格套餐卡片（深海旗舰对比）
   =========================== */
.pricing-cyber-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}

.pricing-cyber-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary-cyan);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), 0 0 30px rgba(0, 242, 254, 0.25);
}

/* 旗舰推荐高亮卡片（VIP2） */
.pricing-cyber-card.recommended-plan {
  background: linear-gradient(180deg, rgba(14, 30, 58, 0.85) 0%, rgba(8, 17, 34, 0.95) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 0 35px rgba(0, 242, 254, 0.3), 0 20px 50px rgba(0, 0, 0, 0.7);
  transform: scale(1.04);
}

.pricing-cyber-card.recommended-plan:hover {
  transform: scale(1.06) translateY(-8px);
  box-shadow: 0 0 50px rgba(0, 242, 254, 0.5), 0 25px 60px rgba(0, 0, 0, 0.8);
}

/* 推荐专属流光徽章 */
.badge-recommend-cyber {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: linear-gradient(135deg, #00F2FE 0%, #0284C7 100%);
  color: #06080F;
  font-weight: 700;
  font-size: 0.8rem;
  padding: 0.3rem 0.85rem;
  border-radius: 9999px;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.6);
  letter-spacing: 0.5px;
}

.price-value {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1;
  margin: 1.25rem 0 1.75rem;
}

.feature-list-cyber {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem 0;
  text-align: left;
}

.feature-list-cyber li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.feature-list-cyber li i {
  color: var(--primary-cyan);
  font-size: 1.05rem;
}

/* ===========================
   用户评价与真实反馈（航海日志口碑）
   =========================== */
.testimonial-cyber-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.25s ease;
  height: 100%;
}

.testimonial-cyber-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 242, 254, 0.15);
}

.quote-icon {
  font-size: 2rem;
  color: rgba(0, 242, 254, 0.3);
  margin-bottom: 0.5rem;
}

.user-avatar-tag {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.avatar-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2) 0%, rgba(2, 132, 199, 0.4) 100%);
  border: 1px solid var(--primary-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  font-weight: 700;
  font-size: 1rem;
}

/* ===========================
   常见疑问手风琴（FAQ Accordion）
   =========================== */
.faq-cyber-accordion .accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg) !important;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: all 0.25s ease;
}

.faq-cyber-accordion .accordion-item:hover {
  border-color: rgba(0, 242, 254, 0.3);
}

.faq-cyber-accordion .accordion-button {
  background: rgba(13, 22, 41, 0.8);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.05rem;
  padding: 1.25rem 1.5rem;
  box-shadow: none;
}

.faq-cyber-accordion .accordion-button:not(.collapsed) {
  background: rgba(18, 30, 56, 0.95);
  color: var(--primary-cyan);
  border-bottom: 1px solid rgba(0, 242, 254, 0.15);
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.08);
}

.faq-cyber-accordion .accordion-button::after {
  filter: invert(1) hue-rotate(180deg);
}

.faq-cyber-accordion .accordion-body {
  background: rgba(10, 16, 30, 0.85);
  color: var(--text-secondary);
  line-height: 1.8;
  padding: 1.25rem 1.5rem;
}

/* ===========================
   页脚与版权区域
   =========================== */
.footer-cyber {
  background: #04060A;
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2.5rem;
  color: var(--text-muted);
}

.footer-cyber a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-cyber a:hover {
  color: var(--primary-cyan);
  text-shadow: 0 0 8px rgba(0, 242, 254, 0.4);
}

/* ===========================
   响应式微调
   =========================== */
@media (max-width: 991.98px) {
  .pricing-cyber-card.recommended-plan {
    transform: none;
    margin-top: 1rem;
    margin-bottom: 1rem;
  }
  .pricing-cyber-card.recommended-plan:hover {
    transform: translateY(-6px);
  }
  .hero-cyber {
    padding: 4rem 0 3rem;
  }
}