/* ==========================================================================
   泰山机场 (taishanjc.sbs) 官方全套样式系统
   设计美学：泰山雄峰暗黑琉璃金极速美学 + 粒子光束 + 高端 Glassmorphism 拟态
   ========================================================================== */

:root {
  --bg-dark: #07090e;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.9);
  --border-color: rgba(245, 158, 11, 0.18);
  --border-glow: rgba(56, 189, 248, 0.45);
  
  --primary-gold: #f59e0b;
  --primary-gold-light: #fbbf24;
  --accent-cyan: #38bdf8;
  --accent-cyan-bright: #06b6d4;
  --accent-purple: #818cf8;

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dark: #6b7280;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --transition-fast: 0.25s ease;
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  
  --container-max: 1280px;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  background: radial-gradient(circle at 50% 0%, #1e1b4b 0%, #07090e 65%);
}

/* 鼠标尾翼 Canvas 绝对覆盖 */
#cursor-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* 容器与通用类 */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.text-gold {
  color: var(--primary-gold);
}

.text-cyan {
  color: var(--accent-cyan);
}

.gradient-text {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  font-weight: 600;
  font-size: 1rem;
  border-radius: 9999px;
  text-decoration: none;
  transition: var(--transition-smooth);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-gold) 0%, #d97706 100%);
  color: #000;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.7);
  background: linear-gradient(135deg, var(--primary-gold-light) 0%, var(--primary-gold) 100%);
}

.btn-outline {
  background: rgba(17, 24, 39, 0.6);
  color: var(--accent-cyan);
  border-color: rgba(56, 189, 248, 0.4);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
  color: #fff;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
}

.btn-recommend {
  background: linear-gradient(135deg, #818cf8 0%, #4f46e5 100%);
  color: #ffffff;
  border-color: rgba(165, 180, 252, 0.4);
  box-shadow: 0 0 15px rgba(79, 70, 229, 0.4);
}

.btn-recommend:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(99, 102, 241, 0.6);
  background: linear-gradient(135deg, #a5b4fc 0%, #6366f1 100%);
}

/* ==========================================================================
   Header 导航栏
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 9, 14, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-gold), var(--accent-cyan));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero 视效主体（响应图3：整个极具真实高清风貌的泰山底层背景）
   ========================================================================== */
.hero {
  position: relative;
  padding: 7rem 0 8rem;
  text-align: center;
  overflow: hidden;
  background: url('../images/taishan_hero_bg.svg') no-repeat center center / cover;
  border-bottom: 1px solid var(--border-color);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1.3rem;
  background: rgba(17, 24, 39, 0.7);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 9999px;
  color: var(--primary-gold-light);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
}

.hero h1 {
  font-size: clamp(2.6rem, 5vw, 4.3rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
  text-shadow: 0 6px 30px rgba(0, 0, 0, 0.9);
}

.hero p {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  color: var(--text-main);
  margin-bottom: 2.5rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 4px 15px rgba(0,0,0,0.85);
  font-weight: 400;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 4.5rem;
  background: rgba(11, 16, 28, 0.85);
  border: 1px solid var(--border-color);
  padding: 2rem 1.8rem;
  border-radius: 20px;
  backdrop-filter: blur(20px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.stat-item h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-cyan);
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ==========================================================================
   价格方案板块（一排平铺 Horizontal Row Layout）
   ========================================================================== */
.pricing-section {
  padding: 5rem 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
}

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

.pricing-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
  backdrop-filter: blur(12px);
  position: relative;
}

.price-card.popular {
  border-color: var(--primary-gold);
  background: rgba(245, 158, 11, 0.06);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.15);
  transform: translateY(-8px);
}

.popular-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: linear-gradient(135deg, var(--primary-gold), #d97706);
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.8rem;
  border-radius: 9999px;
  text-transform: uppercase;
}

.price-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.2);
}

.price-card-header h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.price-card-header p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

.price-amount {
  font-size: 2.2rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
}

.price-amount span {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 0.3rem;
}

.price-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.price-features li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.price-features li::before {
  content: "✓";
  color: var(--primary-gold);
  font-weight: 900;
}

.price-card .btn {
  width: 100%;
}

/* ==========================================================================
   核心优势 (响应图2：换下图标，严格排成 2个一排 / 2-Column Grid)
   ========================================================================== */
.features-section {
  padding: 5rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 图2重写：2个一排的格式 */
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 18px;
  padding: 2.2rem;
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  transition: var(--transition-smooth);
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.15);
}

.feature-icon-wrapper {
  flex-shrink: 0;
  width: 58px;
  height: 58px;
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.15);
}

.feature-info {
  flex-grow: 1;
}

.feature-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: #fff;
}

.feature-info p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   SEO 文章矩阵列表 (响应图1：强行连成一排 / 6-Column Single Horizontal Row Layout)
   ========================================================================== */
.articles-section {
  padding: 5rem 0;
  background: rgba(11, 15, 25, 0.7);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* 连成一排，桌面端平铺6列，超窄屏允许顺畅平滑滚轨 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr); /* 连成一排关键CSS */
  gap: 1.2rem;
  align-items: stretch;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary-gold);
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.2);
}

.article-body {
  padding: 1.4rem 1.2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}

.tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  border-radius: 4px;
}

.article-body h3 {
  font-size: 0.98rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  line-height: 1.35;
}

.article-body h3 a {
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition-fast);
}

.article-body h3 a:hover {
  color: var(--primary-gold);
}

.article-body p {
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-bottom: 1rem;
  flex-grow: 1;
  line-height: 1.5;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 0.6rem;
}

/* ==========================================================================
   用户评价 Section
   ========================================================================== */
.reviews-section {
  padding: 5rem 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 1.8rem;
}

.stars {
  color: var(--primary-gold);
  margin-bottom: 0.8rem;
}

.review-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
  font-style: italic;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.user-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.user-role {
  font-size: 0.8rem;
  color: var(--text-dark);
}

/* ==========================================================================
   FAQ 折叠问答 (响应图4：问答框要带灯 / Neon Glow Lamp Indicator Lights)
   ========================================================================== */
.faq-section {
  padding: 5rem 0;
  background: rgba(11, 15, 25, 0.4);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item.active {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.25), inset 0 0 15px rgba(56, 189, 248, 0.08);
}

.faq-question {
  width: 100%;
  padding: 1.3rem 1.8rem;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 1rem;
}

.faq-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

/* 问答框发光指示灯 (图4关键要求) */
.faq-lamp {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-cyan-bright);
  box-shadow: 0 0 8px var(--accent-cyan), 0 0 16px var(--accent-cyan-bright);
  transition: all 0.3s ease;
  display: inline-block;
  flex-shrink: 0;
}

.faq-item.active .faq-lamp {
  background: var(--primary-gold-light);
  box-shadow: 0 0 12px var(--primary-gold), 0 0 25px var(--primary-gold-light);
  transform: scale(1.3);
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--accent-cyan);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--primary-gold);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 1.8rem;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.8rem 1.4rem 2.8rem;
}

/* ==========================================================================
   文章详情页 (Single Article Layout)
   ========================================================================== */
.article-page {
  padding: 4rem 0 6rem;
}

.article-header {
  max-width: 820px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.article-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 1.2rem;
  line-height: 1.25;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.article-content {
  max-width: 820px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 3rem 2.5rem;
  border-radius: 20px;
  backdrop-filter: blur(12px);
}

.article-content h2 {
  font-size: 1.6rem;
  color: var(--primary-gold);
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(245, 158, 11, 0.2);
}

.article-content h3 {
  font-size: 1.3rem;
  color: var(--accent-cyan);
  margin: 1.5rem 0 0.8rem;
}

.article-content p {
  color: #d1d5db;
  margin-bottom: 1.4rem;
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1.5rem 2rem;
  color: #d1d5db;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content blockquote {
  border-left: 4px solid var(--primary-gold);
  background: rgba(245, 158, 11, 0.08);
  padding: 1.2rem 1.5rem;
  border-radius: 0 12px 12px 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-main);
}

.article-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-content a:hover {
  color: var(--primary-gold);
}

.cta-box {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(56, 189, 248, 0.15));
  border: 1px solid var(--primary-gold);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  margin: 2.5rem 0;
}

.cta-box h3 {
  color: #fff;
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
}

/* ==========================================================================
   页脚与精准 PBN 输血区 (Footer & SEO Links)
   ========================================================================== */
footer {
  background: #040609;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 3.5rem 0 2rem;
  color: var(--text-dark);
  text-align: center;
  position: relative;
  z-index: 10;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-muted);
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

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

.pbn-links-area {
  margin-top: 1rem;
  padding-top: 1.2rem;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  font-size: 0.8rem;
  color: var(--text-dark);
}

.pbn-links-area span {
  opacity: 0.7;
}

.pbn-links-area a {
  color: #6b7280;
  text-decoration: none;
  transition: color 0.2s ease;
}

.pbn-links-area a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.copyright {
  font-size: 0.8rem;
  color: var(--text-dark);
  margin-top: 0.5rem;
}

/* ==========================================================================
   移动端响应式 (Responsive Design)
   ========================================================================== */
@media (max-width: 1200px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .pricing-row, .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(7, 9, 14, 0.95);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.2rem;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-links.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }

  .pricing-row, .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 450px;
    margin: 0 auto;
  }
  .price-card.popular {
    transform: none;
  }

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

  .article-content {
    padding: 1.8rem 1.2rem;
  }
}