/* ==========================================================================
   奈云 NaiYun (naiyunjc.buzz) - NaiYun Control 深蓝简洁控制台
   设计语言规范：现代网络基础设施控制台，信息秩序清晰，拒绝无谓浮华
   ========================================================================== */

:root {
  --color-bg-dark: #0B182B;
  --color-bg-card-dark: #12223B;
  --color-bg-light: #FFFFFF;
  --color-bg-subtle: #F6F8FC;
  --color-bg-panel: #EDF2F9;
  
  --color-brand-blue: #2459FF;
  --color-brand-blue-hover: #1745E6;
  --color-brand-light-blue: #E8EFFF;
  --color-brand-cyan: #38BDF8;

  --color-heading: #15233C;
  --color-heading-light: #F1F5F9;
  --color-text-main: #536178;
  --color-text-light: #94A3B8;
  --color-text-dim: #64748B;
  
  --color-border: #E1E7F0;
  --color-border-dark: #1E3354;
  --color-border-focus: #2459FF;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --header-height: 72px;
  --max-content-width: 1200px;
  --article-width: 760px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-light);
  color: var(--color-text-main);
  line-height: 1.65;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: var(--max-content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 控制台模块编号与标题组件 */
.section-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.section-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-brand-blue);
  letter-spacing: 0.08em;
  background-color: var(--color-brand-light-blue);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-main);
  max-width: 680px;
  margin-top: 8px;
}

.section-divider {
  width: 100%;
  height: 1px;
  background-color: var(--color-border);
  margin-top: 32px;
  margin-bottom: 48px;
}

/* ==========================================================================
   01. 顶部全局导航栏 (深蓝控制台配色)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-bg-dark);
  border-bottom: 1px solid var(--color-border-dark);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo-img {
  height: 38px;
  width: auto;
  object-fit: contain;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: color 0.2s ease;
  position: relative;
  padding: 8px 0;
}

.nav-link:hover, .nav-link.active {
  color: #FFFFFF;
}

.nav-link:hover::after, .nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-brand-blue);
}

/* 导航操作按钮 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-console-sm {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-brand-primary {
  background-color: var(--color-brand-blue);
  color: #FFFFFF;
  border: 1px solid var(--color-brand-blue);
}

.btn-brand-primary:hover {
  background-color: var(--color-brand-blue-hover);
  border-color: var(--color-brand-blue-hover);
}

.btn-brand-outline {
  background-color: transparent;
  color: var(--color-text-light);
  border: 1px solid var(--color-border-dark);
}

.btn-brand-outline:hover {
  color: #FFFFFF;
  border-color: var(--color-text-light);
}

.is-unconfigured {
  opacity: 0.8;
  cursor: pointer;
  position: relative;
}

.is-unconfigured::after {
  content: "待配置";
  font-size: 0.7rem;
  background: rgba(255, 255, 255, 0.2);
  margin-left: 6px;
  padding: 1px 4px;
  border-radius: 2px;
  font-family: var(--font-mono);
}

/* 移动端菜单汉堡按钮 */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 44px;
  height: 44px;
  padding: 10px 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #FFFFFF;
  border-radius: 1px;
  transition: all 0.25s ease;
}

/* ==========================================================================
   02. 品牌首屏 Hero (深蓝品牌背景)
   ========================================================================== */
.hero-section {
  background-color: var(--color-bg-dark);
  color: #FFFFFF;
  padding: 80px 0 100px;
  position: relative;
  border-bottom: 1px solid var(--color-border-dark);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 56px;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(36, 89, 255, 0.16);
  border: 1px solid rgba(36, 89, 255, 0.4);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-brand-cyan);
  margin-bottom: 24px;
}

.hero-badge .status-dot {
  width: 8px;
  height: 8px;
  background-color: #10B981;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px #10B981;
}

.hero-title {
  font-size: 2.875rem;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.025em;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 1.1875rem;
  font-weight: 500;
  color: var(--color-brand-cyan);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: #94A3B8;
  max-width: 580px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  background-color: var(--color-brand-blue);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-brand-blue);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-hero-primary:hover {
  background-color: var(--color-brand-blue-hover);
  border-color: var(--color-brand-blue-hover);
  transform: translateY(-1px);
}

.btn-hero-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: #E2E8F0;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(226, 232, 240, 0.2);
  transition: all 0.2s ease;
}

.btn-hero-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.4);
}

.hero-graphic-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
}

/* ==========================================================================
   03. 服务重点 (三个主要说明区)
   ========================================================================== */
.features-section {
  padding: 88px 0;
  background-color: var(--color-bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.feature-box {
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  position: relative;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature-box:hover {
  border-color: var(--color-brand-blue);
  transform: translateY(-2px);
}

.feature-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-brand-blue);
  margin-bottom: 16px;
  display: block;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 14px;
}

.feature-desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-main);
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-text-dim);
  border-top: 1px dashed var(--color-border);
  padding-top: 16px;
}

.feature-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
}

.feature-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-brand-blue);
}

/* ==========================================================================
   04. 套餐资料 (简洁表格，横向对照)
   ========================================================================== */
.plans-section {
  padding: 88px 0;
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.plans-control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.plans-source-tabs {
  display: inline-flex;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.plan-tab-btn {
  padding: 8px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-main);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.plan-tab-btn.active {
  background-color: var(--color-brand-blue);
  color: #FFFFFF;
}

.source-alert-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background-color: #FEF3C7;
  color: #92400E;
  border: 1px solid #FCD34D;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
}

.plan-tab-panel {
  display: none;
}

.plan-tab-panel.active {
  display: block;
}

/* 套餐标准横向表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

.pricing-table th {
  background-color: var(--color-bg-panel);
  color: var(--color-heading);
  font-weight: 700;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.pricing-table td {
  padding: 20px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

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

.pricing-table tr:hover td {
  background-color: #FAFBFD;
}

.plan-name-cell {
  font-weight: 700;
  color: var(--color-heading);
  font-size: 1.0625rem;
}

.plan-price-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-brand-blue);
}

.plan-cycle-tag {
  display: inline-block;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  background: var(--color-bg-subtle);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.status-badge-pending {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background-color: #F1F5F9;
  color: #475569;
  border: 1px solid #CBD5E1;
}

.plans-footnote {
  margin-top: 18px;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  line-height: 1.6;
}

/* ==========================================================================
   05. 开通与使用流程 (编号式水平步骤)
   ========================================================================== */
.workflow-section {
  padding: 88px 0;
  background-color: var(--color-bg-light);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.step-card {
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-subtle);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  position: relative;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-brand-blue);
  margin-bottom: 12px;
  display: block;
}

.step-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--color-text-main);
  line-height: 1.65;
}

/* ==========================================================================
   06. 六篇实用文章 (编号式文章目录列表)
   ========================================================================== */
.articles-section {
  padding: 88px 0;
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.article-numbered-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 40px;
}

.article-row-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 32px;
  gap: 24px;
  transition: all 0.2s ease;
}

.article-row-item:hover {
  border-color: var(--color-brand-blue);
  box-shadow: 0 4px 12px rgba(11, 24, 43, 0.04);
}

.article-row-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-brand-blue);
  line-height: 1;
}

.article-row-content {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.article-row-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-brand-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.article-row-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.4;
  transition: color 0.2s ease;
}

.article-row-title:hover {
  color: var(--color-brand-blue);
}

.article-row-summary {
  font-size: 0.9375rem;
  color: var(--color-text-main);
  line-height: 1.6;
}

.article-row-meta {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  display: flex;
  gap: 16px;
  margin-top: 4px;
}

.article-read-btn {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-brand-blue);
  border: 1px solid var(--color-border);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-subtle);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.article-read-btn:hover {
  background-color: var(--color-brand-blue);
  color: #FFFFFF;
  border-color: var(--color-brand-blue);
}

/* ==========================================================================
   07. 常见问题 FAQ (手风琴)
   ========================================================================== */
.faq-section {
  padding: 88px 0;
  background-color: var(--color-bg-light);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 40px;
  max-width: 960px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: #FFFFFF;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item.active {
  border-color: var(--color-brand-blue);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  text-align: left;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-heading);
  background: none;
}

.faq-question:hover {
  color: var(--color-brand-blue);
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--color-text-dim);
  transition: transform 0.2s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--color-brand-blue);
}

.faq-answer {
  display: none;
  padding: 0 24px 24px 24px;
  font-size: 0.9375rem;
  color: var(--color-text-main);
  line-height: 1.75;
  border-top: 1px dashed var(--color-border);
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   08. 关于奈云 (资料站定位与合规声明)
   ========================================================================== */
.about-section {
  padding: 88px 0;
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
}

.about-box {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px 48px;
}

.about-text {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--color-text-main);
  margin-bottom: 20px;
}

.about-alert {
  background-color: #EFF6FF;
  border-left: 4px solid var(--color-brand-blue);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: #1E40AF;
  line-height: 1.6;
}

/* ==========================================================================
   09. 页脚 Footer (简洁控制台规范)
   ========================================================================== */
.site-footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border-dark);
  padding: 64px 0 40px;
  font-size: 0.875rem;
}

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

.footer-brand-desc {
  font-size: 0.875rem;
  color: #94A3B8;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 360px;
}

.footer-col-title {
  color: #FFFFFF;
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #64748B;
  font-size: 0.8125rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   响应式断点适配 (375px, 390px, 768px, 1024px, 1440px)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  html, body {
    max-width: 100%;
    overflow-x: hidden;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .site-header {
    height: 64px;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background-color: var(--color-bg-dark);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--color-border-dark);
    gap: 16px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
    z-index: 1001;
  }

  .nav-links.nav-open {
    display: flex;
  }

  /* 移动端隐藏顶部冗余按钮，保留左侧Logo与右侧汉堡菜单 */
  .header-actions .btn-brand-outline,
  .header-actions .btn-brand-primary {
    display: none;
  }

  .brand-logo-img {
    height: 32px;
  }

  .hero-title {
    font-size: 2.125rem;
  }

  /* 套餐表格移动端自适应转换为纵向明细卡片 */
  .table-responsive {
    border: none;
    background: transparent;
    overflow-x: visible;
  }

  .pricing-table, 
  .pricing-table tbody, 
  .pricing-table tr, 
  .pricing-table td {
    display: block;
    width: 100%;
    box-sizing: border-box;
  }

  .pricing-table thead {
    display: none;
  }

  .pricing-table tr {
    background-color: #FFFFFF;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 6px rgba(11, 24, 43, 0.03);
  }

  .pricing-table td {
    padding: 10px 0;
    border-bottom: 1px dashed var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: right;
  }

  .pricing-table td::before {
    content: attr(data-label);
    font-weight: 700;
    color: var(--color-heading);
    font-size: 0.875rem;
    text-align: left;
    margin-right: 12px;
  }

  .pricing-table td.plan-name-cell {
    border-bottom: 2px solid var(--color-brand-blue);
    padding-bottom: 12px;
    margin-bottom: 4px;
  }

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

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .article-row-item {
    grid-template-columns: 1fr;
    padding: 20px;
    gap: 16px;
  }

  .article-row-num {
    font-size: 1.25rem;
  }

  .about-box {
    padding: 24px 20px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.875rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions a {
    width: 100%;
    text-align: center;
  }
}

/* ==========================================================================
   无障碍支持与减弱动态偏好 (Prefers Reduced Motion)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}