/**
 * 尔湾云 (erwanyun.shop) - 全局与响应式布局样式表
 * 融合框架 98 (3D 软陶拟态) 与模板 70 (3D 星际飞船)
 */

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--clay-text);
  background-color: var(--clay-bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 锚点偏移修正，确保固定顶部导航不遮挡标题 */
section[id] {
  scroll-margin-top: 96px;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 节段通用排版 */
.section-py {
  padding-top: 90px;
  padding-bottom: 90px;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--clay-radius-full);
  background: #ffffff;
  box-shadow: var(--clay-shadow-sm);
  color: var(--clay-primary);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 16px;
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--clay-text-muted);
  line-height: 1.65;
}

/* =======================================================
   1. 固定毛玻璃软陶顶部导航栏
   ======================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(240, 244, 249, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 4px 20px rgba(160, 185, 220, 0.15);
  transition: all 0.3s ease;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-icon-box {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: #ffffff;
  box-shadow: var(--clay-shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.9);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.brand-logo-wrap:hover .brand-icon-box {
  transform: rotate(-8deg) scale(1.08);
}

.brand-title-group {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.375rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clay-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--clay-text-muted);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--clay-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2.5px;
  border-radius: 2px;
  background: var(--clay-primary);
  transition: width 0.25s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 移动端菜单汉堡按钮 */
.mobile-toggle {
  display: none;
  background: #ffffff;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: var(--clay-shadow-sm);
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  justify-content: space-around;
}

.mobile-toggle span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--clay-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* =======================================================
   2. 首屏 Hero 区域 (双栏交互：文案+吉祥物+3D飞船)
   ======================================================= */
.hero-section {
  padding-top: 48px;
  padding-bottom: 72px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge-wrap {
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title .highlight-blue {
  color: var(--clay-primary);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.1875rem;
  line-height: 1.7;
  color: var(--clay-text-muted);
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-trust-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  padding-top: 24px;
  border-top: 1px solid rgba(203, 213, 225, 0.6);
  width: 100%;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #475569;
}

.trust-icon {
  color: #10b981;
}

/* 首屏右侧：3D 星际飞船全息舞台 */
.hero-visual-stage {
  position: relative;
  width: 100%;
}

/* 浮动可交互吉祥物悬挂卡片 */
.mascot-floating-card {
  position: absolute;
  top: -24px;
  left: -20px;
  z-index: 10;
}

/* =======================================================
   3. 全球骨干网络节点实时测速遥测条 (Ping Telemetry)
   ======================================================= */
.telemetry-strip {
  margin-top: 40px;
  background: #ffffff;
  padding: 16px 24px;
  border-radius: var(--clay-radius-md);
  box-shadow: var(--clay-shadow-sm);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  align-items: center;
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.telemetry-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 1.5rem;
  line-height: 1;
}

.node-meta {
  display: flex;
  flex-direction: column;
}

.node-city {
  font-size: 0.875rem;
  font-weight: 700;
  color: #1e293b;
}

.node-ping {
  font-size: 0.75rem;
  font-weight: 700;
  color: #10b981;
  display: flex;
  align-items: center;
  gap: 4px;
}

.node-ping-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
}

/* =======================================================
   4. 品牌核心优势与网络架构
   ======================================================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-clay-card {
  padding: 36px 30px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-icon-bubble {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: linear-gradient(135deg, #e0f2fe 0%, #bfdbfe 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clay-primary);
  margin-bottom: 22px;
  box-shadow: var(--clay-shadow-sm);
  border: 2px solid #ffffff;
}

.feature-title {
  font-size: 1.375rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--clay-text-muted);
}

/* =======================================================
   5. 官方套餐资费与周期切换 (Plans & Pricing)
   ======================================================= */
.pricing-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.cycle-toggle-wrapper {
  background: #e2e8f0;
  padding: 6px;
  border-radius: var(--clay-radius-full);
  box-shadow: var(--clay-shadow-inset);
  display: flex;
  align-items: center;
}

.cycle-btn {
  padding: 10px 24px;
  border-radius: var(--clay-radius-full);
  border: none;
  background: transparent;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--clay-text-muted);
  cursor: pointer;
  transition: all 0.25s ease;
}

.cycle-btn.active {
  background: #ffffff;
  color: var(--clay-primary);
  box-shadow: var(--clay-shadow-sm);
}

.cycle-discount-badge {
  background: #f97316;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: var(--clay-radius-full);
  margin-left: 4px;
}

.coupon-banner {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border-radius: var(--clay-radius-md);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
  box-shadow: var(--clay-shadow-sm);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.coupon-text {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #1e3a8a;
  display: flex;
  align-items: center;
  gap: 8px;
}

.coupon-code-box {
  background: #ffffff;
  padding: 6px 14px;
  border-radius: var(--clay-radius-full);
  font-family: monospace;
  font-size: 1rem;
  font-weight: 800;
  color: #2563eb;
  border: 1px dashed #60a5fa;
  cursor: pointer;
  transition: all 0.2s ease;
}

.coupon-code-box:hover {
  background: #2563eb;
  color: #ffffff;
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.plan-card {
  padding: 36px 26px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  position: relative;
}

.plan-card.featured {
  border: 3px solid #3b82f6;
  transform: translateY(-8px);
  box-shadow: var(--clay-shadow-lg);
}

.plan-tag-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--clay-radius-full);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.4);
}

.plan-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.375rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--clay-text-muted);
}

.plan-pricing-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid #f1f5f9;
}

.plan-currency {
  font-size: 1.25rem;
  font-weight: 800;
  color: #0f172a;
}

.plan-amount {
  font-size: 2.75rem;
  font-weight: 900;
  color: #0f172a;
  line-height: 1;
}

.plan-period {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--clay-text-muted);
}

.plan-features-list {
  flex-grow: 1;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: #334155;
}

.plan-feature-icon {
  color: #10b981;
  flex-shrink: 0;
}

/* =======================================================
   6. 客户端支持与 4 步极简配置教程
   ======================================================= */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}

.client-card {
  padding: 24px 18px;
  background: #ffffff;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.client-icon-circle {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  box-shadow: var(--clay-shadow-sm);
  color: var(--clay-primary);
}

.client-name {
  font-size: 1.0625rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 4px;
}

.client-app-rec {
  font-size: 0.8125rem;
  color: var(--clay-text-muted);
}

/* 4步极简上手时间线 */
.workflow-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  padding: 30px 24px;
  background: #ffffff;
  position: relative;
}

.step-number {
  font-size: 2.25rem;
  font-weight: 900;
  color: #93c5fd;
  opacity: 0.7;
  line-height: 1;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--clay-text-muted);
  line-height: 1.6;
}

/* =======================================================
   7. 官方专栏 6 篇深度原创文章入口
   ======================================================= */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-summary-card {
  padding: 32px 28px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 0.8125rem;
  color: var(--clay-text-muted);
}

.article-card-category {
  color: var(--clay-primary);
  font-weight: 700;
}

.article-card-title {
  font-size: 1.1875rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.45;
  margin-bottom: 12px;
  flex-grow: 1;
}

.article-card-title a:hover {
  color: var(--clay-primary);
}

.article-card-snippet {
  font-size: 0.875rem;
  color: var(--clay-text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--clay-primary);
  margin-top: auto;
}

.article-card-link:hover {
  text-decoration: underline;
}

/* =======================================================
   8. 用户评价及真实反馈入口
   ======================================================= */
.feedback-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: start;
}

.reviews-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.review-item {
  padding: 24px 28px;
  background: #ffffff;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  box-shadow: var(--clay-shadow-sm);
}

.review-author-name {
  font-size: 0.9375rem;
  font-weight: 800;
  color: #0f172a;
}

.review-plan-badge {
  font-size: 0.75rem;
  color: var(--clay-text-muted);
}

.review-quote {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: #334155;
}

.feedback-form-box {
  padding: 32px;
  background: #ffffff;
}

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 8px;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--clay-radius-sm);
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  font-family: inherit;
  font-size: 0.9375rem;
  box-shadow: var(--clay-shadow-inset);
  outline: none;
  transition: border-color 0.2s ease;
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--clay-primary);
  background: #ffffff;
}

/* =======================================================
   9. 常见问题 FAQ 手风琴
   ======================================================= */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-card {
  background: #ffffff;
  border-radius: var(--clay-radius-sm);
  box-shadow: var(--clay-shadow-sm);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.8);
  transition: all 0.25s ease;
}

.faq-card.active {
  box-shadow: var(--clay-shadow-md);
}

.faq-question-btn {
  width: 100%;
  padding: 22px 28px;
  background: transparent;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 700;
  color: #0f172a;
  gap: 16px;
}

.faq-toggle-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clay-primary);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  flex-shrink: 0;
}

.faq-card.active .faq-toggle-icon {
  transform: rotate(180deg);
  background: var(--clay-primary);
  color: #ffffff;
}

.faq-answer-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 28px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--clay-text-muted);
}

.faq-card.active .faq-answer-content {
  padding-bottom: 24px;
}

/* =======================================================
   10. 官方页脚 (Footer)
   ======================================================= */
.site-footer {
  margin-top: auto;
  background: #ffffff;
  border-top: 1px solid rgba(226, 232, 240, 0.8);
  padding-top: 64px;
  padding-bottom: 40px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 0.875rem;
  color: var(--clay-text-muted);
  line-height: 1.65;
  margin-top: 14px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 18px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--clay-text-muted);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--clay-primary);
}

.footer-bottom-bar {
  padding-top: 28px;
  border-top: 1px solid #f1f5f9;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--clay-text-light);
}

/* =======================================================
   响应式媒体查询 (320px - 1024px)
   ======================================================= */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    align-items: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-trust-badges {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .plans-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-inner {
    height: 70px;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #ffffff;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 2rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .plans-grid {
    grid-template-columns: 1fr;
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .workflow-steps-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .feedback-grid {
    grid-template-columns: 1fr;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
  .coupon-banner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}