/* ==========================================================================
   良心云机场 - 极简生命线：数字避难所与平价面包 (Digital Bread & Essential Lifeline)
   设计系统与 CSS 样式表
   ========================================================================== */

:root {
  /* 核心色彩系统 */
  --bg-main: #F4F4F1;        /* 极浅亚麻灰底色 */
  --bg-card: #FFFFFF;        /* 纯白质感卡片 */
  --bg-secondary: #EBEBE6;   /* 次级区分色区 */
  --bg-dark: #1A1C19;        /* 炭灰深沉底色 */
  
  --text-main: #1C1F1B;      /* 主文本墨黑 */
  --text-muted: #5C625C;     /* 辅助文本 */
  --text-light: #8E948E;     /* 浅色标注 */
  --text-white: #FAF9F6;     /* 暗色背景反白字 */

  --accent-orange: #D96B27;  /* 温暖平价面包橙 */
  --accent-green: #2B6E4A;   /* 基建平稳绿 */
  --accent-border: #1C1F1B;  /* 直角实心边框 */

  /* 布局与排版 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", "Courier New", Courier, monospace;
  --max-width: 1200px;
  --header-height: 72px;

  /* 阴影与微动效 */
  --shadow-flat: 4px 4px 0px #1C1F1B;
  --shadow-hover: 6px 6px 0px #D96B27;
  --shadow-soft: 0 10px 30px rgba(0,0,0,0.05);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 全局重置与基调 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

/* 导航栏 Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(244, 244, 241, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--border-color, #E2E2DC);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-badge {
  background: var(--accent-orange);
  color: var(--text-white);
  font-size: 0.75rem;
  padding: 2px 8px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 2px;
}

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

.nav-links a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-muted);
  position: relative;
  padding: 4px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-orange);
  transition: width var(--transition-fast);
}

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

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

/* 按钮通用组件 - 北欧平价朴素直角块 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  border: 2px solid var(--accent-border);
  border-radius: 0px; /* 朴素直角块 */
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: none;
}

.btn-primary {
  background-color: var(--bg-dark);
  color: var(--text-white);
  box-shadow: var(--shadow-flat);
}

.btn-primary:hover {
  background-color: var(--accent-orange);
  color: var(--text-white);
  border-color: var(--bg-dark);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.btn-outline {
  background-color: var(--bg-card);
  color: var(--text-main);
  box-shadow: 3px 3px 0px var(--accent-border);
}

.btn-outline:hover {
  background-color: var(--bg-secondary);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0px var(--accent-border);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}

/* 移动端菜单开关按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-main);
}

/* Hero 首屏 */
.hero {
  padding: 140px 0 80px;
  position: relative;
  background: linear-gradient(180deg, #F4F4F1 0%, #EBEBE6 100%);
  border-bottom: 2px solid #E2E2DC;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 600px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: #E2E4DD;
  border: 1px solid #C8CBC0;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-green);
  margin-bottom: 24px;
}

.hero-tag span {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-title span.highlight {
  color: var(--accent-orange);
  background: linear-gradient(180deg, transparent 70%, #F5D5C0 70%);
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-features-list {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid #D8D8CE;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.hero-features-list item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-media {
  position: relative;
}

.hero-media img {
  border: 3px solid var(--accent-border);
  box-shadow: 10px 10px 0px var(--accent-border);
  background: var(--bg-card);
  transition: transform var(--transition-fast);
}

.hero-media img:hover {
  transform: translate(-3px, -3px);
}

.hero-badge-floating {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: var(--accent-orange);
  color: var(--text-white);
  padding: 16px 24px;
  border: 2px solid var(--accent-border);
  box-shadow: 4px 4px 0px var(--accent-border);
  font-weight: 800;
  font-size: 0.9rem;
}

/* 核心优势板块 Advantage Cards */
.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-subtitle {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.card {
  background: var(--bg-card);
  border: 2px solid var(--accent-border);
  padding: 36px 30px;
  box-shadow: var(--shadow-flat);
  transition: all var(--transition-fast);
  position: relative;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 8px 8px 0px var(--accent-orange);
}

.card-icon {
  width: 56px;
  height: 56px;
  background: var(--bg-main);
  border: 2px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 24px;
  color: var(--accent-orange);
}

.card-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.card-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  flex-grow: 1;
}

/* 价格套餐 section - 对应用户截图与平价面包比喻 */
.pricing-section {
  background: var(--bg-secondary);
  border-top: 2px solid #E2E2DC;
  border-bottom: 2px solid #E2E2DC;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 3px solid var(--accent-border);
  padding: 40px 28px;
  position: relative;
  box-shadow: 6px 6px 0px var(--accent-border);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.pricing-card.popular {
  border-color: var(--accent-orange);
  box-shadow: 8px 8px 0px var(--accent-orange);
  transform: scale(1.02);
}

.pricing-card:hover {
  transform: translateY(-6px);
}

.badge-popular {
  position: absolute;
  top: -16px;
  right: 24px;
  background: var(--accent-orange);
  color: #FFF;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border: 2px solid var(--accent-border);
  text-transform: uppercase;
}

.pricing-metaphor {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #F4F4F1;
  padding: 10px 14px;
  border: 1px dashed var(--accent-border);
  margin-bottom: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-green);
}

.pricing-metaphor-icon {
  font-size: 1.4rem;
}

.pricing-title {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 8px;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pricing-rate {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-orange);
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid #E5E5DE;
}

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

.pricing-features li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.pricing-features li::before {
  content: '✓';
  color: var(--accent-green);
  font-weight: 900;
}

/* 适合人群 Target Audience */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.audience-item {
  background: var(--bg-card);
  border: 2px solid var(--accent-border);
  padding: 24px;
  text-align: center;
  box-shadow: 3px 3px 0px var(--accent-border);
}

.audience-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.audience-item h4 {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.audience-item p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Clash / Clash Party 教程 preview */
.tutorial-preview {
  background: var(--bg-card);
  border: 3px solid var(--accent-border);
  box-shadow: 8px 8px 0px var(--accent-border);
  padding: 48px;
  margin-top: 40px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 36px;
  position: relative;
}

.step-card {
  background: var(--bg-main);
  border: 2px solid var(--accent-border);
  padding: 24px;
  position: relative;
}

.step-num {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent-orange);
  line-height: 1;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 用户评价 Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 2px solid var(--accent-border);
  padding: 28px;
  box-shadow: 4px 4px 0px var(--accent-border);
}

.testimonial-quote {
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 42px;
  height: 42px;
  background: var(--accent-orange);
  color: #FFF;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--accent-border);
}

.user-info h5 {
  font-size: 0.95rem;
  font-weight: 800;
}

.user-info span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* FAQ 板块 */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 2px solid var(--accent-border);
  box-shadow: 3px 3px 0px var(--accent-border);
  transition: all var(--transition-fast);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-toggle {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--accent-orange);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  border-top: 1px solid transparent;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
  border-top-color: #E2E2DC;
}

/* 文章列表 Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 2px solid var(--accent-border);
  box-shadow: 4px 4px 0px var(--accent-border);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.article-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0px var(--accent-orange);
}

.article-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tag {
  align-self: flex-start;
  background: var(--bg-main);
  border: 1px solid var(--accent-border);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 8px;
  margin-bottom: 12px;
  color: var(--accent-green);
}

.article-title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-main);
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.6;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
  border-top: 1px solid #EBEBE5;
  padding-top: 12px;
}

/* SEO 文章详情页排版 */
.article-detail {
  padding: 120px 0 80px;
  max-width: 860px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb a:hover {
  color: var(--accent-orange);
}

.article-header {
  margin-bottom: 40px;
  border-bottom: 2px solid var(--accent-border);
  padding-bottom: 30px;
}

.article-header h1 {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #2D312E;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-border);
}

.article-content h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
}

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

.article-content blockquote {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-orange);
  padding: 16px 20px;
  margin: 24px 0;
  font-style: italic;
  font-weight: 600;
}

.article-content code {
  background: #E8E8E2;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  border: 1px solid #D2D2C8;
}

.cta-box-inline {
  background: #FFF;
  border: 3px solid var(--accent-border);
  box-shadow: 6px 6px 0px var(--accent-border);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.cta-box-inline h4 {
  font-size: 1.4rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.cta-box-inline p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* 页脚 Footer */
.footer {
  background: var(--bg-dark);
  color: var(--text-white);
  padding: 70px 0 30px;
  border-top: 4px solid var(--accent-orange);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-brand p {
  color: #A0A5A0;
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--accent-orange);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #C2C7C2;
  font-size: 0.88rem;
}

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

.footer-bottom {
  border-top: 1px solid #2D302D;
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: #808580;
}

/* 响应式适配 Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    margin: 0 auto;
  }
  .hero-cta {
    justify-content: center;
  }
  .hero-features-list {
    justify-content: center;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-main);
    border-bottom: 2px solid var(--accent-border);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  }
  .nav-links.active {
    display: flex;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}