/* 
  Shanshui Cloud (山水云) - Main Stylesheet
  Style: Minimalist Ancient Chinese, Light Cyan, Mobile-First
*/

:root {
  --primary-cyan: #8FB2B1; /* 浅青色 */
  --primary-dark: #3A5F5E; /* 深青色 */
  --ink-black: #1A1C1A; /* 墨黑 */
  --bg-color: #F8F9F8; /* 纸白 */
  --bg-card: #FFFFFF;
  --text-main: #2E3331; /* 灰黑，适合长阅读 */
  --text-muted: #6B7773;
  --border-color: #D3E0DF;
  --accent-red: #B54B4B; /* 印章红点缀 */
  
  --font-serif: "Noto Serif CJK SC", "Songti SC", "STZhongsong", SimSun, serif;
  --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 3rem;
  --spacing-xl: 5rem;
  
  --radius: 8px;
  --shadow: 0 4px 24px rgba(58, 95, 94, 0.08);
  --transition: all 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--ink-black);
  line-height: 1.3;
}

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

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

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

/* Layout */
.container {
  width: 100%;
  padding: 0 var(--spacing-sm);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
    padding: 0 var(--spacing-md);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 1000px;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: bold;
  letter-spacing: 2px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background-color: var(--primary-cyan);
  color: #fff;
  border: 1px solid var(--primary-cyan);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-dark);
  border: 1px solid var(--primary-dark);
}

.btn-outline:hover {
  background-color: var(--primary-cyan);
  color: #fff;
  border-color: var(--primary-cyan);
}

/* Header & Nav */
header {
  background-color: rgba(248, 249, 248, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-sm) 0;
}

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

.logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--ink-black);
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 24px;
  background: var(--primary-cyan);
  border-radius: 50%;
  opacity: 0.8;
}

.nav-links {
  display: none;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
    gap: var(--spacing-md);
  }
  
  .nav-links a {
    font-family: var(--font-serif);
    color: var(--text-main);
  }
  
  .nav-links a:hover {
    color: var(--primary-cyan);
  }
}

/* Hero Section */
.hero {
  padding: var(--spacing-lg) 0;
  position: relative;
  overflow: hidden;
}

.hero-bg-ink {
  position: absolute;
  top: -10%;
  right: -10%;
  width: 50%;
  height: 120%;
  background: radial-gradient(circle, var(--primary-cyan) 0%, transparent 70%);
  opacity: 0.1;
  z-index: -1;
  border-radius: 50%;
}

.hero-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
}

.hero-content {
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
  letter-spacing: 4px;
}

.hero .subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-serif);
}

.hero-image {
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: auto;
  transform: scale(1);
  transition: transform 5s ease;
}

.hero-image:hover img {
  transform: scale(1.05);
}

@media (min-width: 768px) {
  .hero-container {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  
  .hero-content {
    flex: 1;
    text-align: left;
  }
  
  .hero h1 {
    font-size: 3.5rem;
  }
  
  .hero-image {
    flex: 1;
  }
}

/* Section Titles */
.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-title h2 {
  font-size: 2rem;
  position: relative;
  display: inline-block;
  padding-bottom: 10px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background-color: var(--accent-red);
}

.section-padding {
  padding: var(--spacing-xl) 0;
}

/* Feature Cards */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: var(--transition);
  text-align: center;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-cyan);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-cyan);
  font-family: var(--font-serif);
}

.card h3 {
  margin-bottom: var(--spacing-xs);
  font-size: 1.25rem;
}

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

/* Media & AI */
.media-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .media-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow);
}

.pricing-card.popular {
  border-color: var(--primary-cyan);
  box-shadow: var(--shadow);
}

.pricing-card.popular::before {
  content: '推荐';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent-red);
  color: #fff;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.85rem;
  font-family: var(--font-serif);
}

.pricing-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--primary-dark);
  margin-bottom: var(--spacing-md);
}

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

.pricing-features {
  list-style: none;
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.pricing-features li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-color);
  color: var(--text-main);
  position: relative;
  padding-left: 24px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--primary-cyan);
  position: absolute;
  left: 0;
}

/* SEO Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: var(--transition);
}

.article-card:hover {
  box-shadow: var(--shadow);
}

.article-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-bottom: 1px solid var(--border-color);
}

.article-content {
  padding: var(--spacing-sm);
}

.article-content h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* FAQ */
.faq-item {
  margin-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--spacing-sm);
}

.faq-q {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--ink-black);
  margin-bottom: var(--spacing-xs);
  cursor: pointer;
}

.faq-a {
  color: var(--text-muted);
}

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.review-card {
  background: var(--bg-card);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  position: relative;
}

.review-card::before {
  content: '"';
  font-family: var(--font-serif);
  font-size: 4rem;
  color: rgba(143, 178, 177, 0.2);
  position: absolute;
  top: 10px;
  left: 20px;
  line-height: 1;
}

.review-text {
  font-style: italic;
  margin-bottom: var(--spacing-sm);
  position: relative;
  z-index: 1;
}

.review-author {
  font-weight: bold;
  text-align: right;
  color: var(--primary-dark);
}

/* Footer */
footer {
  background-color: var(--ink-black);
  color: #fff;
  padding: var(--spacing-lg) 0 var(--spacing-sm);
  margin-top: var(--spacing-xl);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-serif);
}

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

.copyright {
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-sm);
}

/* Content Page (Article/About/Terms/Privacy) */
.content-page {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.content-page h1 {
  text-align: center;
  margin-bottom: var(--spacing-md);
  font-size: 2.2rem;
}

.content-page h2 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.content-page p {
  margin-bottom: var(--spacing-sm);
}

.content-page ul, .content-page ol {
  margin-bottom: var(--spacing-sm);
  padding-left: 2rem;
}

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