/**
 * 尔湾云 (erwancloud.lol) 全站核心样式表
 * 融合 框架91「蒸汽波 复古夕阳与格网」与 模板「3D 彩虹光谱」
 */

/* 1. 样式重置与全局变量 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg-primary: #080214;
  --color-bg-secondary: #120727;
  --color-bg-tertiary: #1b0a38;
  --color-bg-card: rgba(22, 9, 44, 0.72);
  --color-bg-card-hover: rgba(35, 14, 70, 0.85);

  --color-text-main: #f5f0ff;
  --color-text-muted: #b9a9d9;
  --color-text-dim: #7d6e99;

  --color-accent-pink: #ff71ce;
  --color-accent-cyan: #01cdfe;
  --color-accent-purple: #b967ff;
  --color-accent-gold: #ffb86c;
  --color-accent-green: #05ffa1;

  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: 'Courier New', 'Consolas', 'Fira Code', monospace;

  --container-max-width: 1240px;
  --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
  font-family: var(--font-main);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

a {
  color: var(--color-accent-cyan);
  text-decoration: none;
  transition: var(--transition-smooth);
}

a:hover {
  color: var(--color-accent-pink);
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 2. 头部导航栏 (Header & Navbar) */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: var(--transition-smooth);
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 113, 206, 0.15);
}

.site-header.scrolled {
  background: rgba(8, 2, 20, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 12px 0;
  border-bottom: 1px solid rgba(1, 205, 254, 0.25);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #ffffff;
}

.brand-icon-svg {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  box-shadow: 0 0 14px rgba(255, 113, 206, 0.5);
}

.brand-title {
  background: linear-gradient(135deg, #ffffff 30%, var(--color-accent-pink) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 1.45rem;
}

.brand-domain-pill {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 12px;
  background: rgba(1, 205, 254, 0.15);
  border: 1px solid rgba(1, 205, 254, 0.4);
  color: var(--color-accent-cyan);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-pink), var(--color-accent-cyan));
  transition: width 0.3s ease;
}

.nav-links a:hover {
  color: #ffffff;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-header-cta {
  padding: 8px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 24px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  cursor: pointer;
  padding: 8px;
}

/* 3. Hero 首屏区块 */
.hero-section {
  position: relative;
  overflow: hidden;
  padding-top: 130px;
  padding-bottom: 100px;
  min-height: 88vh;
  display: flex;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge-wrap {
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 38px;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn-secondary-glow {
  padding: 13px 30px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1.02rem;
  color: #ffffff;
  background: rgba(255, 113, 206, 0.1);
  border: 1px solid rgba(255, 113, 206, 0.5);
  box-shadow: 0 0 16px rgba(255, 113, 206, 0.2);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-secondary-glow:hover {
  background: rgba(255, 113, 206, 0.22);
  border-color: var(--color-accent-pink);
  transform: translateY(-2px);
  color: #ffffff;
}

/* 实时专线探针卡片 (Hero Ping Telemetry Card) */
.hero-telemetry-card {
  background: rgba(14, 6, 32, 0.75);
  border: 1px solid rgba(1, 205, 254, 0.35);
  border-radius: 16px;
  padding: 18px 24px;
  backdrop-filter: blur(14px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), 0 0 20px rgba(1, 205, 254, 0.15);
  max-width: 780px;
  margin: 0 auto;
}

.telemetry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent-green);
  box-shadow: 0 0 8px var(--color-accent-green);
  margin-right: 6px;
}

.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 12px;
}

.telemetry-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 8px 10px;
  text-align: center;
  transition: var(--transition-smooth);
}

.telemetry-item:hover {
  border-color: var(--color-accent-cyan);
  background: rgba(1, 205, 254, 0.08);
}

.node-flag {
  font-size: 1.15rem;
  margin-bottom: 2px;
}

.node-name {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.node-ping {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-accent-green);
  margin-top: 2px;
}

/* 4. 通用区块标题与排版 (Section Headings) */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 5;
}

.section-alt {
  background: linear-gradient(180deg, rgba(14, 5, 30, 0.6) 0%, rgba(20, 8, 42, 0.8) 100%);
  border-top: 1px solid rgba(255, 113, 206, 0.12);
  border-bottom: 1px solid rgba(1, 205, 254, 0.12);
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 60px;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-accent-pink);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: inline-block;
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* 5. 核心优势网格 (Advantages Grid) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.feature-card {
  padding: 32px;
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(255, 113, 206, 0.2), rgba(1, 205, 254, 0.2));
  border: 1px solid rgba(255, 113, 206, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 22px;
  box-shadow: 0 0 15px rgba(255, 113, 206, 0.3);
}

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 6. 套餐价格矩阵 (Pricing Cards) */
.billing-switcher {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.billing-switch-wrapper {
  background: rgba(255, 255, 255, 0.06);
  padding: 4px;
  border-radius: 40px;
  display: inline-flex;
  border: 1px solid rgba(255, 113, 206, 0.3);
}

.billing-cycle-btn {
  padding: 8px 24px;
  border-radius: 30px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.billing-cycle-btn.active {
  background: linear-gradient(90deg, var(--color-accent-pink), var(--color-accent-purple));
  color: #ffffff;
  box-shadow: 0 0 15px rgba(255, 113, 206, 0.4);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.plan-card {
  padding: 34px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.plan-card.featured {
  border-color: rgba(255, 113, 206, 0.7);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7), 0 0 35px rgba(255, 113, 206, 0.35);
  transform: translateY(-8px);
}

.plan-badge-top {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #ff007f, #00f0ff);
  color: #ffffff;
  padding: 3px 14px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-tagline {
  color: var(--color-text-dim);
  font-size: 0.85rem;
  margin-bottom: 24px;
}

.plan-pricing-box {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent-cyan);
}

.price-val {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -1px;
  color: #ffffff;
}

.price-period {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.plan-discount-tag {
  display: none;
  font-size: 0.75rem;
  color: var(--color-accent-green);
  font-weight: 600;
  margin-top: 4px;
}

.plan-features-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.plan-features-list li .check-icon {
  color: var(--color-accent-cyan);
  font-weight: bold;
}

.btn-plan-cta {
  width: 100%;
  padding: 12px 20px;
  text-align: center;
  border-radius: 30px;
  font-weight: 700;
  font-size: 0.95rem;
}

/* 7. 流媒体与 AI 解锁生态矩阵 (Ecosystem Grid) */
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.ecosystem-card {
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.eco-icon {
  font-size: 2rem;
  line-height: 1;
}

.eco-info h4 {
  font-size: 1.15rem;
  margin-bottom: 6px;
  color: #ffffff;
}

.eco-info p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.eco-tag {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(5, 255, 161, 0.15);
  color: var(--color-accent-green);
  border: 1px solid rgba(5, 255, 161, 0.3);
}

/* 8. 客户端一键配置指南 (Client Tutorials) */
.tutorial-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 22px;
}

.tutorial-card {
  padding: 28px;
}

.tutorial-platform {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.tutorial-icon {
  font-size: 2rem;
}

.tutorial-platform h3 {
  font-size: 1.25rem;
}

.tutorial-steps {
  padding-left: 20px;
  margin-bottom: 20px;
}

.tutorial-steps li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  line-height: 1.5;
}

/* 9. 官方专栏 6 篇文章精选网格 (Articles Grid) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 26px;
}

.article-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 0.78rem;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
}

.article-category {
  color: var(--color-accent-cyan);
  font-weight: 600;
}

.article-card h3 {
  font-size: 1.22rem;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card h3 a {
  color: #ffffff;
}

.article-card h3 a:hover {
  color: var(--color-accent-pink);
}

.article-excerpt {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent-pink);
}

.article-link-btn:hover {
  color: var(--color-accent-cyan);
  gap: 10px;
}

/* 10. FAQ 手风琴 (Accordion) */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid rgba(255, 113, 206, 0.25);
  border-radius: 12px;
  background: rgba(18, 7, 39, 0.7);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item:hover {
  border-color: rgba(1, 205, 254, 0.5);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.faq-icon-cross {
  font-size: 1.4rem;
  color: var(--color-accent-pink);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon-cross {
  transform: rotate(45deg);
  color: var(--color-accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 380px;
  padding: 0 24px 22px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* 11. 转化号召横幅 (CTA Banner) */
.cta-banner-section {
  padding: 80px 0;
  text-align: center;
}

.cta-banner-box {
  padding: 56px 36px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(32, 11, 62, 0.85) 0%, rgba(14, 5, 30, 0.95) 100%);
  border: 1px solid rgba(255, 113, 206, 0.4);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 40px rgba(255, 113, 206, 0.2);
  position: relative;
  overflow: hidden;
}

.cta-banner-box h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  margin-bottom: 16px;
}

.cta-banner-box p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 34px;
}

/* 12. 页脚 (Footer) */
.site-footer {
  background: #05010e;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 70px 0 35px;
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 380px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1.05rem;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--color-text-dim);
}

.footer-links a:hover {
  color: var(--color-accent-cyan);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
}

/* Toast 提示 */
.global-toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(18, 7, 39, 0.95);
  border: 1px solid var(--color-accent-cyan);
  color: #ffffff;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 0.95rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 20px rgba(1, 205, 254, 0.4);
  z-index: 999;
  opacity: 0;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.global-toast.visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* 13. 响应式布局优化 */
@media (max-width: 992px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(10, 3, 24, 0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid rgba(255, 113, 206, 0.3);
    gap: 18px;
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero-section {
    padding-top: 120px;
    padding-bottom: 80px;
  }
  .features-grid, .plans-grid, .articles-grid, .tutorial-tabs {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn-rainbow-spectrum, .btn-secondary-glow {
    width: 100%;
  }
}