/* 仙路湾机场 - 国风水墨浅色美学全局样式 */
@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&family=Noto+Serif+SC:wght@300;400;600;700&family=PingFang+SC:wght@300;400;500;700&display=swap');

:root {
  --bg-paper: #FAF8F2;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --ink-black: #0F172A;
  --ink-gray: #334155;
  --ink-light: #64748B;
  --mountain-blue: #1E3A8A;
  --bamboo-green: #14532D;
  --cinnabar-red: #991B1B;
  --accent-gold: #B45309;
  --border-ink: rgba(15, 23, 42, 0.15);
  --border-gold: rgba(180, 83, 9, 0.4);
  --shadow-soft: 0 8px 28px rgba(15, 23, 42, 0.08);
  --shadow-hover: 0 16px 40px rgba(15, 23, 42, 0.14);
  --font-serif: 'Noto Serif SC', 'Songti SC', 'Source Han Serif SC', serif;
  --font-calligraphy: 'Ma Shan Zheng', cursive, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

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

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

body {
  background-color: var(--bg-paper);
  background-image: url('assets/ink_landscape_bg.png');
  background-size: cover;
  background-attachment: fixed;
  background-position: center bottom;
  color: var(--ink-black);
  font-family: var(--font-sans);
  line-height: 1.75;
  overflow-x: hidden;
  position: relative;
}

/* 背景提亮淡化遮罩：使背景山水画更淡更透，突出主体内容 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(250, 248, 242, 0.78);
  pointer-events: none;
  z-index: 0;
}

/* Background Canvas for Flowing Ink & Cloud Particles */
#inkCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(250, 248, 242, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-ink);
  transition: all 0.3s ease;
}

header.scrolled {
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.98);
}

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

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

.logo-stamp {
  width: 44px;
  height: 44px;
  background: var(--cinnabar-red);
  color: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-calligraphy);
  font-size: 1.6rem;
  box-shadow: 0 4px 12px rgba(153, 27, 27, 0.3);
  position: relative;
  overflow: hidden;
}

.logo-stamp::after {
  content: '';
  position: absolute;
  inset: 2px;
  border: 1px dashed rgba(255, 255, 255, 0.5);
  border-radius: 6px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink-black);
  letter-spacing: 1px;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--mountain-blue);
  letter-spacing: 2px;
}

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

.nav-link {
  text-decoration: none;
  color: var(--ink-gray);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.25s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--mountain-blue);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--mountain-blue);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--mountain-blue) 0%, #0F172A 100%);
  color: #FFFFFF;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 4px 15px rgba(30, 58, 138, 0.3);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(30, 58, 138, 0.4);
  background: linear-gradient(135deg, #1E40AF 0%, var(--mountain-blue) 100%);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: #FFFFFF;
  color: var(--ink-black);
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1.5px solid var(--border-ink);
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.btn-secondary:hover {
  background: #FFFFFF;
  border-color: var(--mountain-blue);
  color: var(--mountain-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(30, 58, 138, 0.15);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--ink-black);
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(180, 83, 9, 0.1);
  border: 1px solid var(--border-gold);
  border-radius: 30px;
  color: var(--accent-gold);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3.3rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink-black);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

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

.hero-title span.highlight::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 8px;
  background: rgba(30, 58, 138, 0.18);
  z-index: -1;
  border-radius: 4px;
}

.hero-desc {
  max-width: 780px;
  margin: 0 auto 40px;
  font-size: 1.18rem;
  color: var(--ink-gray);
  line-height: 1.85;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-bottom: 50px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 920px;
  margin: 0 auto;
  background: #FFFFFF;
  padding: 32px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-ink);
  box-shadow: var(--shadow-soft);
}

.stat-item {
  text-align: center;
  padding: 0 10px;
  border-right: 1px dashed var(--border-ink);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--mountain-blue);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--ink-light);
  font-weight: 500;
}

/* Common Section Layout */
.section {
  padding: 80px 0;
}

.section-title-wrap {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  font-family: var(--font-serif);
  color: var(--cinnabar-red);
  font-weight: 700;
  letter-spacing: 2px;
  font-size: 0.95rem;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: var(--ink-black);
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--ink-gray);
  font-size: 1.08rem;
}

/* Feature Cards Grid (突出内容卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 38px 30px;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.feature-card:hover {
  background: #FFFFFF;
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--mountain-blue);
}

.feature-icon {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  background: rgba(30, 58, 138, 0.08);
  color: var(--mountain-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.65rem;
  margin-bottom: 22px;
}

.feature-card h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--ink-black);
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--ink-gray);
  font-size: 0.98rem;
  line-height: 1.75;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-lg);
  padding: 42px 34px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.35s ease;
  box-shadow: var(--shadow-soft);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.pricing-card.popular {
  border: 2px solid var(--accent-gold);
  box-shadow: 0 14px 40px rgba(180, 83, 9, 0.2);
  background: #FFFFFF;
  transform: scale(1.04);
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent-gold) 0%, #853E07 100%);
  color: #fff;
  padding: 5px 18px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.plan-name {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  color: var(--ink-black);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--ink-light);
  margin-bottom: 24px;
}

.plan-price {
  font-family: var(--font-serif);
  font-size: 2.9rem;
  font-weight: 700;
  color: var(--mountain-blue);
  margin-bottom: 24px;
}

.plan-price span {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--ink-light);
}

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

.plan-features li {
  padding: 11px 0;
  border-bottom: 1px dashed rgba(15, 23, 42, 0.08);
  color: var(--ink-gray);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li i {
  color: var(--bamboo-green);
  font-size: 1.05rem;
}

/* Tutorials & Audience Tabs */
.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.tutorial-card {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 34px;
  display: flex;
  gap: 22px;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-soft);
}

.tutorial-card:hover {
  background: #FFFFFF;
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--mountain-blue);
}

.tutorial-icon {
  width: 62px;
  height: 62px;
  border-radius: 14px;
  background: rgba(30, 58, 138, 0.1);
  color: var(--mountain-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.85rem;
  flex-shrink: 0;
}

.tutorial-content h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--ink-black);
  margin-bottom: 8px;
}

.tutorial-content p {
  color: var(--ink-gray);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 14px;
}

.tutorial-link {
  color: var(--mountain-blue);
  font-weight: 700;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Articles Section Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.article-card {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-soft);
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--mountain-blue);
}

.article-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-meta {
  font-size: 0.82rem;
  color: var(--accent-gold);
  font-weight: 700;
  margin-bottom: 10px;
}

.article-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--ink-black);
  margin-bottom: 12px;
  line-height: 1.5;
}

.article-card p {
  font-size: 0.92rem;
  color: var(--ink-gray);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--ink-light);
  border-top: 1px dashed var(--border-ink);
  padding-top: 14px;
}

/* Reviews Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 30px;
  position: relative;
  box-shadow: var(--shadow-soft);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--mountain-blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--font-serif);
}

.user-info h4 {
  font-size: 1.05rem;
  color: var(--ink-black);
}

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

.stars {
  color: var(--accent-gold);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--ink-gray);
  line-height: 1.65;
}

/* FAQ Accordion */
.faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-soft);
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink-black);
  text-align: left;
  cursor: pointer;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1), padding 0.35s ease;
  padding: 0 28px;
  color: var(--ink-gray);
  font-size: 0.98rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 28px 24px;
}

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

.faq-icon {
  transition: transform 0.3s ease;
  color: var(--mountain-blue);
}

/* CTA Banner Section */
.cta-banner {
  background: linear-gradient(135deg, var(--mountain-blue) 0%, #0B132B 100%);
  border-radius: var(--radius-lg);
  padding: 70px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.2);
  margin-bottom: 80px;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(180, 83, 9, 0.2) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner h2 {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  margin-bottom: 16px;
}

.cta-banner p {
  font-size: 1.12rem;
  opacity: 0.92;
  max-width: 650px;
  margin: 0 auto 36px;
}

/* Article Layout for SEO Articles */
.article-detail-header {
  padding: 60px 0 30px;
  text-align: center;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--ink-light);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--mountain-blue);
  text-decoration: none;
}

.article-content {
  background: #FFFFFF;
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-lg);
  padding: 50px 60px;
  max-width: 920px;
  margin: 0 auto 60px;
  box-shadow: 0 12px 36px rgba(15, 23, 42, 0.1);
}

.article-content h1 {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  color: var(--ink-black);
  margin-bottom: 20px;
  line-height: 1.35;
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  color: var(--mountain-blue);
  margin: 38px 0 18px;
  border-bottom: 2px solid rgba(30, 58, 138, 0.15);
  padding-bottom: 8px;
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--ink-black);
  margin: 26px 0 14px;
}

.article-content p {
  margin-bottom: 20px;
  color: var(--ink-gray);
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content ul, .article-content ol {
  margin: 0 0 22px 26px;
  color: var(--ink-gray);
}

.article-content li {
  margin-bottom: 10px;
  line-height: 1.75;
  font-size: 1.02rem;
}

.article-cta-box {
  background: rgba(30, 58, 138, 0.05);
  border: 1.5px dashed var(--mountain-blue);
  border-radius: var(--radius-md);
  padding: 26px;
  margin: 32px 0;
  text-align: center;
}

.article-cta-box h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--mountain-blue);
  margin-bottom: 10px;
}

/* Footer */
footer {
  background: #0B132B;
  color: rgba(255, 255, 255, 0.75);
  padding: 70px 0 30px;
  position: relative;
  z-index: 10;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand h3 {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.92rem;
  line-height: 1.75;
  max-width: 320px;
}

.footer-column h4 {
  font-family: var(--font-serif);
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 11px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.25s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 25px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .features-grid, .pricing-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .stat-item {
    border-right: none;
    border-bottom: 1px dashed var(--border-ink);
    padding-bottom: 12px;
  }
  .stat-item:last-child, .stat-item:nth-child(3) {
    border-bottom: none;
  }
  .features-grid, .pricing-grid, .tutorial-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .mobile-toggle {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: #FAF8F2;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    border-bottom: 1px solid var(--border-ink);
  }
  .nav-menu.show {
    display: flex;
  }
  .article-content {
    padding: 30px 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}