/* ==========================================================================
   疾风云 (Jifengyun) - Warm Minimalist Design System
   Inspired by Luxury Goods & Fine Craftsmanship Layouts (Cream, Amber & Dark Charcoal)
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-main: #FBF9F4;
  --bg-card: #FFFFFF;
  --bg-card-alt: #F6F3ED;
  --bg-dark: #191817;
  --bg-dark-card: #242220;
  
  --text-main: #1F1D1A;
  --text-muted: #6C665F;
  --text-light: #9E978C;
  --text-white: #FAF8F5;

  --accent-gold: #C28E38;
  --accent-gold-hover: #A8782B;
  --accent-light: #F4EAD3;
  --border-color: #EBE6DC;
  --border-hover: #D8CEBC;

  /* Fonts */
  --font-heading: 'Noto Serif SC', 'Source Serif Pro', serif;
  --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, sans-serif;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(31, 29, 26, 0.04);
  --shadow-md: 0 8px 24px rgba(31, 29, 26, 0.06);
  --shadow-lg: 0 16px 36px rgba(31, 29, 26, 0.09);

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base Styles */
*, *::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-body);
  line-height: 1.7;
  -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 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Top Banner Notification (Style Ref Fig 2) */
.top-notice-bar {
  background-color: #1A1918;
  color: #DDD6CA;
  font-size: 0.85rem;
  padding: 8px 16px;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.top-notice-bar span.tag {
  background-color: var(--accent-gold);
  color: #FFF;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.top-notice-bar a {
  color: var(--accent-gold);
  text-decoration: underline;
  margin-left: 6px;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(251, 249, 244, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 18px 0;
  transition: all var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-main);
  font-family: var(--font-heading);
}

.brand-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-gold), #8C5F18);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-weight: bold;
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--accent-gold);
  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;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--text-main);
  color: var(--bg-main);
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--accent-gold);
  color: #FFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(194, 142, 56, 0.3);
}

.btn-gold {
  background-color: var(--accent-gold);
  color: #FFF;
}

.btn-gold:hover {
  background-color: var(--accent-gold-hover);
  color: #FFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(194, 142, 56, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: transparent;
  color: var(--text-main);
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--text-main);
  background-color: rgba(0, 0, 0, 0.02);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  margin: 5px 0;
  transition: 0.3s;
}

/* Hero Section (Style Ref Fig 2) */
.hero-section {
  padding: 80px 0 60px;
  background: radial-gradient(circle at 80% 20%, rgba(244, 234, 211, 0.5) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--accent-gold);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
  font-weight: 600;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  line-height: 1.25;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

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

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 540px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.stat-item h4 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-heading);
}

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

.hero-card-preview {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.hero-card-preview::before {
  content: '';
  position: absolute;
  top: -12px;
  right: -12px;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(194, 142, 56, 0.15) 0%, transparent 70%);
  z-index: 0;
}

.card-tag {
  display: inline-block;
  background-color: var(--bg-card-alt);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.hero-card-content h3 {
  font-size: 1.6rem;
  font-family: var(--font-heading);
  margin-bottom: 12px;
}

.hero-card-content p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.feature-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.feature-pill {
  background-color: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--text-main);
}

/* Core Advantages Section (Style Ref Fig 3) */
.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-subtitle {
  color: var(--accent-gold);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

/* Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.advantage-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: var(--bg-card-alt);
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.advantage-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.advantage-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.advantage-tags {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.advantage-tag {
  font-size: 0.75rem;
  color: var(--accent-gold);
  background-color: var(--accent-light);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

/* Pricing Section (Matching Image 1 Data & Modern Card Style) */
.pricing-section {
  background-color: var(--bg-card-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.pricing-table-container {
  margin-bottom: 40px;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.pricing-table th {
  background-color: var(--bg-dark);
  color: #FFF;
  font-weight: 600;
  padding: 18px 24px;
  font-size: 0.95rem;
}

.pricing-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 0.95rem;
}

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

.pricing-table tr:hover td {
  background-color: var(--bg-main);
}

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

.pricing-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: all var(--transition-normal);
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.popular {
  border: 2px solid var(--accent-gold);
  box-shadow: var(--shadow-md);
}

.pricing-card.popular .popular-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background-color: var(--accent-gold);
  color: #FFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-heading);
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-price span.unit {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
}

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

.plan-features li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li svg {
  width: 16px;
  height: 16px;
  color: var(--accent-gold);
  flex-shrink: 0;
}

/* User Personas Section */
.personas-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.persona-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  transition: all var(--transition-normal);
}

.persona-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-gold);
  box-shadow: var(--shadow-sm);
}

.persona-icon {
  width: 56px;
  height: 56px;
  background-color: var(--bg-card-alt);
  color: var(--accent-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
}

.persona-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.persona-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Testimonials / User Reviews Carousel (Style Ref Fig 5) */
.testimonials-section {
  background-color: var(--bg-main);
}

.testimonial-carousel {
  position: relative;
  overflow: hidden;
  padding: 20px 0 40px;
}

.testimonial-track {
  display: flex;
  gap: 28px;
  transition: transform 0.5s ease-in-out;
}

.testimonial-card {
  min-width: calc(33.333% - 19px);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.rating-stars {
  color: #D4A373;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 1rem;
  color: var(--text-main);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.testimonial-author p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.carousel-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-top: 30px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.carousel-dot.active {
  background-color: var(--accent-gold);
  width: 28px;
  border-radius: var(--radius-pill);
}

/* Articles Section (Style Ref Fig 3 Grid) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-gold);
}

.article-category {
  font-size: 0.75rem;
  color: var(--accent-gold);
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 12px;
  color: var(--text-main);
}

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

.article-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-card:hover .article-link {
  color: var(--accent-gold);
}

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

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

.faq-question {
  padding: 22px 28px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background-color: rgba(251, 249, 244, 0.5);
}

.faq-answer-inner {
  padding: 0 28px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* Footer Section */
.footer {
  background-color: var(--bg-dark);
  color: #DDD6CA;
  padding: 80px 0 30px;
  border-top: 1px solid #2C2926;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand h3 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  color: #FFF;
  margin-bottom: 16px;
}

.footer-brand p {
  color: #9E978C;
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 340px;
}

.footer-col h4 {
  font-size: 1rem;
  color: #FFF;
  margin-bottom: 20px;
  font-weight: 600;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  color: #9E978C;
  font-size: 0.88rem;
}

.footer-col ul li a:hover {
  color: var(--accent-gold);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid #2C2926;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: #7E7870;
}

/* Article Detail Layout Styles */
.article-page {
  padding: 60px 0;
}

.article-header {
  max-width: 840px;
  margin: 0 auto 40px;
  text-align: center;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.article-title {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  line-height: 1.3;
  color: var(--text-main);
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.article-content {
  max-width: 840px;
  margin: 0 auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  color: var(--text-main);
  margin: 40px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.3rem;
  color: var(--text-main);
  margin: 28px 0 14px;
}

.article-content p {
  color: #33302C;
  font-size: 1.02rem;
  line-height: 1.85;
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
  color: #33302C;
}

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

.article-content blockquote {
  background-color: var(--bg-card-alt);
  border-left: 4px solid var(--accent-gold);
  padding: 20px 24px;
  margin: 28px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-muted);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.92rem;
}

.article-table th, .article-table td {
  padding: 14px 18px;
  border: 1px solid var(--border-color);
}

.article-table th {
  background-color: var(--bg-card-alt);
  font-weight: 700;
  color: var(--text-main);
}

.article-cta-box {
  background: linear-gradient(135deg, #242220 0%, #191817 100%);
  color: #FFF;
  border-radius: var(--radius-md);
  padding: 36px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h3 {
  color: #FFF;
  margin-top: 0;
  margin-bottom: 12px;
}

.article-cta-box p {
  color: #DDD6CA;
  margin-bottom: 24px;
}

/* Responsiveness */
@media (max-width: 1024px) {
  .advantages-grid, .pricing-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .personas-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .testimonial-card {
    min-width: calc(50% - 14px);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .advantages-grid, .pricing-grid, .articles-grid, .personas-grid {
    grid-template-columns: 1fr;
  }
  .testimonial-card {
    min-width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-content {
    padding: 24px;
  }
}