/* ==========================================================================
   一元机场 (yiyuan-jichang.net) - Light Neon-Tech Styling System
   ========================================================================== */

:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-dark-accent: #0b0f19;
  
  --primary-purple: #7c3aed;
  --primary-indigo: #4f46e5;
  --primary-blue: #2563eb;
  --primary-cyan: #0891b2;
  --neon-pink: #d946ef;
  
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --gradient-neon: linear-gradient(135deg, #7c3aed 0%, #3b82f6 50%, #06b6d4 100%);
  --gradient-btn: linear-gradient(90deg, #6366f1 0%, #3b82f6 100%);
  --gradient-card: linear-gradient(145deg, #a855f7 0%, #6366f1 50%, #3b82f6 100%);
  --gradient-light-bg: radial-gradient(circle at 50% 0%, rgba(124, 58, 237, 0.08) 0%, rgba(59, 130, 246, 0.03) 50%, rgba(248, 250, 252, 1) 100%);
  
  --border-light: rgba(226, 232, 240, 0.8);
  --border-neon: rgba(124, 58, 237, 0.3);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
  --shadow-neon: 0 12px 35px -5px rgba(124, 58, 237, 0.2);
  --shadow-card-hover: 0 20px 40px -10px rgba(99, 102, 241, 0.18);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  background: var(--bg-main);
  background-image: var(--gradient-light-bg);
  background-attachment: fixed;
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--primary-indigo);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-purple);
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  padding: 1rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-neon);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  color: var(--text-body);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary-purple);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-neon);
  border-radius: 2px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  text-decoration: none;
  font-size: 0.95rem;
}

.btn-primary {
  background: var(--gradient-btn);
  color: white !important;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-outline {
  background: white;
  color: var(--text-main);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  border-color: var(--primary-indigo);
  color: var(--primary-indigo);
  transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

/* Hero Section */
.hero {
  padding: 5rem 0 4rem;
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-full);
  color: var(--primary-purple);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

/* Floating Banner Feature Cards (Reference Image 3) */
.floating-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.float-card {
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  color: white;
  text-align: left;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-neon);
  transition: var(--transition);
  animation: floatAnim 6s ease-in-out infinite;
}

.float-card:nth-child(2) {
  animation-delay: -2s;
  background: linear-gradient(135deg, #6366f1 0%, #3b82f6 50%, #06b6d4 100%);
}

.float-card:nth-child(3) {
  animation-delay: -4s;
  background: linear-gradient(135deg, #7c3aed 0%, #ec4899 50%, #f43f5e 100%);
}

.float-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 25px 50px -10px rgba(124, 58, 237, 0.4);
}

@keyframes floatAnim {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.float-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 70%);
  border-radius: 50%;
  pointer-events: none;
}

.float-card-icon {
  width: 56px;
  height: 56px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.float-card-title {
  font-size: 1.6rem;
  color: white;
  margin-bottom: 0.75rem;
}

.float-card-desc {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.float-card-link {
  color: white;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* Features Grid */
.section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  font-size: 2.25rem;
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 3.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.feature-item {
  background: var(--bg-card);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-neon);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(124, 58, 237, 0.1);
  color: var(--primary-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Pricing Section (Reference Image 1) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: center;
  margin-top: 2rem;
}

.pricing-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}

.pricing-card.featured {
  border: 2px solid var(--primary-purple);
  box-shadow: var(--shadow-neon);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: var(--shadow-card-hover);
}

.badge-pop {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: white;
  padding: 0.35rem 1.2rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.plan-title {
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 1rem;
}

.plan-price {
  text-align: center;
  margin-bottom: 1.25rem;
  color: var(--primary-purple);
}

.plan-price .currency {
  font-size: 1.5rem;
  font-weight: 700;
}

.plan-price .amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}

.plan-price .period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.plan-desc {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  min-height: 50px;
}

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

.plan-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
  color: var(--text-body);
}

.plan-features li svg {
  color: var(--primary-purple);
  flex-shrink: 0;
}

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

/* App Matrix Section (Reference Image 2 - Light Theme) */
.app-matrix-section {
  background: var(--bg-card);
  color: var(--text-main);
  border-radius: var(--radius-lg);
  padding: 4rem 2rem;
  margin: 4rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.app-matrix-section h2 {
  color: var(--text-main);
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.app-matrix-sub {
  color: var(--primary-purple);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-top: 2.5rem;
  overflow: hidden;
  background: var(--bg-main);
}

.app-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.75rem 1rem;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
  transition: var(--transition);
}

.app-item:hover {
  background: rgba(124, 58, 237, 0.05);
  border-color: var(--border-neon);
  transform: scale(1.03);
}

.app-item svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
  color: var(--text-main);
  transition: var(--transition);
}

.app-item:hover svg {
  color: var(--primary-purple);
}

.app-item span {
  font-size: 0.8rem;
  color: var(--text-body);
  font-weight: 600;
}

/* Tutorial Tabs Preview */
.tutorial-preview {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.tutorial-tabs {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-main);
  border: 1px solid var(--border-light);
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active, .tab-btn:hover {
  background: var(--gradient-btn);
  color: white;
  border-color: transparent;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.step-card {
  background: var(--bg-main);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary-purple);
}

.step-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-purple);
  margin-bottom: 0.5rem;
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-question svg {
  transition: transform 0.3s ease;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem;
}

/* Knowledge Base Article & Content Styling */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2.5rem;
  padding: 3rem 0;
}

.article-main {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 1rem;
}

.article-body h2 {
  font-size: 1.75rem;
  margin: 2rem 0 1rem;
  color: var(--text-main);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid rgba(124, 58, 237, 0.1);
}

.article-body h3 {
  font-size: 1.35rem;
  margin: 1.5rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.75;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

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

.article-body blockquote {
  background: rgba(124, 58, 237, 0.05);
  border-left: 4px solid var(--primary-purple);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
  font-style: italic;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-widget {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--border-light);
}

.widget-title {
  font-size: 1.15rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

/* Callout Box */
.callout {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.06) 0%, rgba(59, 130, 246, 0.06) 100%);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
}

.callout-title {
  font-weight: 700;
  color: var(--primary-purple);
  margin-bottom: 0.5rem;
}

/* Table Styling */
.table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-light);
}

th, td {
  padding: 0.9rem 1.2rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
}

th {
  background: var(--bg-main);
  font-weight: 700;
  color: var(--text-main);
}

tr:hover {
  background: rgba(124, 58, 237, 0.02);
}

/* Footer (Light Theme) */
.footer {
  background: var(--bg-card);
  color: var(--text-muted);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
  border-top: 1px solid var(--border-light);
}

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

.footer-col h4 {
  color: var(--text-main);
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.footer-links a:hover {
  color: var(--primary-purple);
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 2rem auto 0;
  }

  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

  .app-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .article-layout {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border-light);
  }

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

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

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

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

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}