/* ==========================================================
   上线性能与顺滑度增强引擎 (Smoothness & Performance Optimization)
   ========================================================== */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  width: 100%;
}

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

/* 硬件加速与流畅悬停 */
a, button, .media-news-card, .btn-media-primary, .btn-media-secondary, .faq-card, .intro-panel {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform: translateZ(0);
}

/* 移动端平滑滚动与防抖 */
.table-wrapper, .table-container, .code-box, pre {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

/* 媒体图片防溢出与自适应 */
img, svg, video, canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 消除点击高亮延迟 */
a, button, input, select, textarea {
  -webkit-tap-highlight-color: transparent;
}

:root {
  /* 绿色安全认证风设计系统变量 (Green Security & Safety Certification Aesthetic) */
  --sec-bg: #f6fbf7;              /* 柔和清透安全浅绿底色 */
  --sec-bg-alt: #ecfdf5;          /* 浅翡翠微底 */
  --sec-surface: #ffffff;         /* 纯白卡片 */
  --sec-primary: #059669;         /* 认证翡翠绿 (Security Emerald) */
  --sec-primary-dark: #047857;    /* 浓郁森林深绿 */
  --sec-primary-light: #d1fae5;   /* 极浅绿背景 */
  --sec-primary-border: #a7f3d0;  /* 柔和绿边框 */
  
  --sec-warning: #d97706;         /* 风险警示橙 */
  --sec-warning-light: #fef3c7;   /* 浅警示黄底 */
  --sec-warning-border: #fde68a;  /* 警示边框 */
  
  --sec-danger: #dc2626;          /* 拦截危险红 */
  --sec-danger-light: #fee2e2;    /* 浅红背景 */
  
  --sec-text-main: #064e3b;       /* 浓郁墨绿主文字 */
  --sec-text-body: #1f2937;       /* 深灰正文 */
  --sec-text-muted: #374151;      /* 严谨次级文字 */
  --sec-text-sub: #6b7280;        /* 辅助说明灰 */
  
  --sec-border: #d1fae5;          /* 认证体系边框 */
  --sec-border-solid: #e5e7eb;    /* 常规边框 */
  
  --sec-radius: 8px;              /* 安全标准圆角 */
  --sec-radius-lg: 12px;          /* 容器大圆角 */
  --sec-shadow: 0 4px 12px rgba(5, 150, 105, 0.06);
  --sec-shadow-hover: 0 10px 24px rgba(5, 150, 105, 0.14);
  --sec-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --sec-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --sec-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body {
  font-family: var(--sec-font);
  background-color: var(--sec-bg);
  color: var(--sec-text-body);
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部声明区 */
.sec-topbar {
  background-color: var(--sec-warning-light);
  border-bottom: 1px solid var(--sec-warning-border);
  padding: 10px 0;
  font-size: 13px;
  color: #92400e;
}

.topbar-inner {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.sec-badge {
  display: inline-block;
  white-space: nowrap;
  background: var(--sec-warning);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  margin-top: 1px;
}

.topbar-text {
  flex: 1;
  line-height: 1.55;
}

/* 头部导航 */
.sec-header {
  background: var(--sec-surface);
  border-bottom: 1px solid var(--sec-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(5, 150, 105, 0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.sec-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.sec-logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--sec-radius);
  background: linear-gradient(135deg, var(--sec-primary) 0%, #047857 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
}

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

.sec-main-title {
  font-size: 18px;
  font-weight: 900;
  color: var(--sec-text-main);
  letter-spacing: -0.3px;
}

.sec-main-title span {
  color: var(--sec-primary);
}

.sec-sub-title {
  font-size: 11px;
  color: var(--sec-text-sub);
}

.sec-ssl-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--sec-primary-light);
  border: 1px solid var(--sec-primary-border);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  color: var(--sec-primary-dark);
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav a {
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--sec-text-muted);
  text-decoration: none;
  border-radius: var(--sec-radius);
  transition: var(--sec-transition);
}

.nav a:hover {
  color: var(--sec-primary-dark);
  background-color: var(--sec-primary-light);
}

.nav a.active {
  color: var(--sec-primary-dark);
  background-color: var(--sec-primary-light);
  font-weight: 800;
}

/* 主标题区 / 英雄区 */
.sec-hero {
  padding: 56px 0 44px;
  text-align: center;
  background: radial-gradient(circle at 50% 15%, #ecfdf5 0%, var(--sec-bg) 80%);
  border-bottom: 1px solid var(--sec-border);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 16px;
  background-color: var(--sec-primary-light);
  border: 1px solid var(--sec-primary-border);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 800;
  color: var(--sec-primary-dark);
  margin-bottom: 20px;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sec-primary);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.2);
}

.sec-hero h1 {
  font-size: 34px;
  font-weight: 900;
  color: var(--sec-text-main);
  line-height: 1.35;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}

.sec-hero p.hero-desc {
  max-width: 840px;
  margin: 0 auto 32px;
  font-size: 16px;
  color: var(--sec-text-muted);
  line-height: 1.8;
}

/* 双入口按钮 CTA */
.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.sec-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--sec-radius);
  text-decoration: none;
  transition: var(--sec-transition);
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--sec-primary) 0%, #047857 100%);
  color: #ffffff;
  border: 1px solid #047857;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3);
}

.btn-primary:hover {
  background: #047857;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(5, 150, 105, 0.4);
}

.btn-secondary {
  background-color: var(--sec-surface);
  color: var(--sec-text-main);
  border: 1px solid var(--sec-primary-border);
  box-shadow: var(--sec-shadow);
}

.btn-secondary:hover {
  background-color: var(--sec-primary-light);
  border-color: var(--sec-primary);
  transform: translateY(-2px);
}

/* 安全风险核验全景卡片 (Risk Warning & Verification Grid) */
.security-alert-box {
  margin: 10px auto 0;
  max-width: 1040px;
  background: var(--sec-surface);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius-lg);
  padding: 24px 28px;
  box-shadow: var(--sec-shadow);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  text-align: left;
}

.alert-item {
  display: flex;
  gap: 14px;
}

.alert-icon-wrap {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.alert-green {
  background: var(--sec-primary-light);
  color: var(--sec-primary);
}

.alert-orange {
  background: var(--sec-warning-light);
  color: var(--sec-warning);
}

.alert-content h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--sec-text-main);
  margin-bottom: 4px;
}

.alert-content p {
  font-size: 13px;
  color: var(--sec-text-sub);
  line-height: 1.6;
}

/* 模块通用样式 */
.section {
  padding: 60px 0;
}

.section-alt {
  background-color: var(--sec-surface);
  border-top: 1px solid var(--sec-border);
  border-bottom: 1px solid var(--sec-border);
}

.section-head {
  text-align: center;
  margin-bottom: 40px;
}

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  color: var(--sec-primary-dark);
  background: var(--sec-primary-light);
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.section-head h2 {
  font-size: 26px;
  font-weight: 900;
  color: var(--sec-text-main);
  margin-bottom: 10px;
}

.section-head p {
  font-size: 15px;
  color: var(--sec-text-muted);
  max-width: 700px;
  margin: 0 auto;
}

/* 六宫格功能模块区 */
.grid-6 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-card {
  background: var(--sec-surface);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius-lg);
  padding: 26px 22px;
  transition: var(--sec-transition);
  display: flex;
  flex-direction: column;
  box-shadow: var(--sec-shadow);
  position: relative;
}

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

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card-stamp {
  font-family: var(--sec-font-mono);
  font-size: 12px;
  font-weight: 800;
  color: var(--sec-primary-dark);
  background: var(--sec-primary-light);
  padding: 3px 8px;
  border-radius: 4px;
}

.card-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--sec-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.grid-card h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--sec-text-main);
  margin-bottom: 10px;
}

.grid-card p {
  font-size: 14px;
  color: var(--sec-text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex: 1;
}

.card-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 800;
  color: var(--sec-primary);
  text-decoration: none;
  transition: var(--sec-transition);
}

.card-footer-link:hover {
  color: var(--sec-primary-dark);
  text-decoration: underline;
}

/* 正文介绍区（教程中心 + 我们提供什么） */
.intro-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.intro-box {
  background: var(--sec-surface);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius-lg);
  padding: 32px 28px;
  box-shadow: var(--sec-shadow);
}

.intro-box h3 {
  font-size: 19px;
  font-weight: 900;
  color: var(--sec-text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.intro-box p {
  font-size: 14px;
  color: var(--sec-text-muted);
  line-height: 1.75;
  margin-bottom: 16px;
}

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

.intro-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--sec-text-body);
}

.feature-bullet {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sec-primary);
  margin-top: 8px;
  flex-shrink: 0;
}

/* 热门教程表格 */
.table-wrapper {
  background: var(--sec-surface);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius-lg);
  overflow: hidden;
  box-shadow: var(--sec-shadow);
}

.sec-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.sec-table th {
  background-color: var(--sec-bg-alt);
  padding: 15px 20px;
  font-size: 13px;
  font-weight: 900;
  color: var(--sec-text-main);
  border-bottom: 1px solid var(--sec-primary-border);
}

.sec-table td {
  padding: 15px 20px;
  font-size: 14px;
  color: var(--sec-text-muted);
  border-bottom: 1px solid var(--sec-border);
  vertical-align: middle;
}

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

.sec-table tr:hover td {
  background-color: var(--sec-primary-light);
}

.badge-target {
  display: inline-block;
  background: var(--sec-primary-light);
  color: var(--sec-text-main);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--sec-primary-border);
}

.badge-difficulty {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
}

.diff-easy {
  background: var(--sec-primary-light);
  color: var(--sec-primary-dark);
  border: 1px solid var(--sec-primary-border);
}

.diff-med {
  background: var(--sec-warning-light);
  color: #92400e;
  border: 1px solid var(--sec-warning-border);
}

.diff-hard {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* FAQ 常见问答 */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.faq-card {
  background: var(--sec-surface);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius);
  padding: 22px 20px;
  box-shadow: var(--sec-shadow);
}

.faq-card h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--sec-text-main);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.faq-card h4 .q-mark {
  color: var(--sec-primary);
  font-weight: 900;
}

.faq-card p {
  font-size: 14px;
  color: var(--sec-text-muted);
  line-height: 1.7;
}

/* 延伸阅读区 */
.extended-reading {
  margin-top: 40px;
  background: var(--sec-primary-light);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius-lg);
  padding: 24px 28px;
}

.extended-reading h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--sec-text-main);
  margin-bottom: 12px;
}

.extended-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.extended-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  border: 1px solid var(--sec-primary-border);
  padding: 6px 14px;
  border-radius: var(--sec-radius);
  font-size: 13px;
  font-weight: 700;
  color: var(--sec-primary-dark);
  text-decoration: none;
  transition: var(--sec-transition);
}

.extended-links a:hover {
  background: var(--sec-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

/* 页脚 */
.sec-footer {
  background: #064e3b;
  color: #a7f3d0;
  padding: 50px 0 30px;
  border-top: 3px solid var(--sec-primary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(167, 243, 208, 0.15);
}

.footer-brand {
  max-width: 540px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  color: #ffffff;
  font-size: 16px;
}

.sec-logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--sec-primary);
  color: #fff;
  border-radius: 4px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  color: #6ee7b7;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 20px;
  max-width: 440px;
}

.footer-nav a {
  color: #d1fae5;
  text-decoration: none;
  font-size: 14px;
  transition: var(--sec-transition);
}

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

.footer-bottom {
  padding-top: 24px;
  text-align: center;
  font-size: 12px;
  color: #34d399;
}

/* 子页面排版 */
.subpage-hero {
  padding: 40px 0 32px;
  background: var(--sec-surface);
  border-bottom: 1px solid var(--sec-border);
}

.subpage-hero h1 {
  font-size: 26px;
  font-weight: 900;
  color: var(--sec-text-main);
  margin-bottom: 10px;
}

.subpage-hero p {
  font-size: 15px;
  color: var(--sec-text-muted);
}

.article-container {
  padding: 44px 0;
}

.article-content {
  background: var(--sec-surface);
  border: 1px solid var(--sec-primary-border);
  border-radius: var(--sec-radius-lg);
  padding: 40px;
  box-shadow: var(--sec-shadow);
}

.article-content h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--sec-text-main);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--sec-border);
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--sec-primary-dark);
  margin: 24px 0 12px;
}

.article-content p {
  font-size: 15px;
  color: var(--sec-text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
  color: var(--sec-text-muted);
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.sec-risk-card {
  background: var(--sec-warning-light);
  border-left: 4px solid var(--sec-warning);
  padding: 16px 20px;
  border-radius: 0 var(--sec-radius) var(--sec-radius) 0;
  margin-bottom: 24px;
  font-size: 14px;
  color: #92400e;
}

.code-box {
  background: #064e3b;
  color: #ecfdf5;
  padding: 18px 22px;
  border-radius: var(--sec-radius);
  font-family: var(--sec-font-mono);
  font-size: 13px;
  overflow-x: auto;
  margin-bottom: 20px;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .sec-ssl-badge {
    display: none;
  }
  .security-alert-box {
    grid-template-columns: 1fr;
  }
  .grid-6 {
    grid-template-columns: repeat(2, 1fr);
  }
  .intro-container {
    grid-template-columns: 1fr;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .grid-6 {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 14px 0;
    gap: 12px;
  }
  .sec-hero h1 {
    font-size: 24px;
  }
  .footer-top {
    flex-direction: column;
  }
}