/* ==========================================================================
   良心云 - 极简高质网络加速推广落地页核心样式表
   设计系统：纸白墨黑、朱砂单重点色、发丝细线纯平哲学
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,700&family=Manrope:wght@400;500;700&family=Noto+Serif+SC:wght@500;700&display=swap');

:root {
  --color-bg: #FAF6EF;              /* 纸白背景 */
  --color-text-main: #1C1A16;        /* 墨黑正文与标题 */
  --color-accent: #E4572E;           /* 朱砂唯一强调色 */
  --color-text-muted: #7A6C58;       /* 暖灰棕次级文字 */
  --color-hover: #EFE7D8;            /* 砂色悬停表面 */
  --color-line: rgba(28, 26, 22, 0.14); /* 发丝细线 */
  --font-serif: 'Fraunces', 'Noto Serif SC', 'Songti SC', SimSun, Georgia, serif;
  --font-sans: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --max-width: 1160px;
  --transition-fast: 0.18s ease;
}

/* 基础重置 - 纯平设计，彻底杜绝渐变与投影 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg);
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  line-height: 1.65;
  font-size: 1rem;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

/* 字体排版系统规范 */
h1, h2, h3, h4, .font-serif, .price-number {
  font-family: var(--font-serif);
  font-optical-sizing: auto;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.25;
}

.sub-cap {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-block;
  margin-bottom: 0.75rem;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-spacing {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
  border-bottom: 1px solid var(--color-line);
}

.section-header {
  margin-bottom: 3.5rem;
  max-width: 720px;
}

.section-header h2 {
  font-size: 2.25rem;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

/* 按钮通用组件 - 严格遵循纯平发丝线规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: #C9421A;
  border-color: #C9421A;
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-main);
  border: 1px solid var(--color-line);
}

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

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

.btn-outline-brand:hover {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

/* 导航条 Header */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
}

.brand-logo .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  display: inline-block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

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

.nav-highlight {
  color: var(--color-accent) !important;
  font-weight: 700 !important;
}

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

/* 主视觉区 Hero */
.hero-section {
  padding-top: 5rem;
  padding-bottom: 5.5rem;
  border-bottom: 1px solid var(--color-line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 3.15rem;
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 1.2rem;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: 2.25rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 2rem;
}

.hero-trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-line);
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.badge-icon {
  width: 16px;
  height: 16px;
  stroke: var(--color-accent);
  stroke-width: 2;
  fill: none;
}

.hero-visual-card {
  border: 1px solid var(--color-line);
  background-color: var(--color-bg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.metrics-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 1rem;
}

.metrics-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.metric-box {
  padding: 1.25rem;
  background-color: var(--color-hover);
  border: 1px solid var(--color-line);
}

.metric-val {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1;
  margin-bottom: 0.35rem;
}

.metric-val.accent {
  color: var(--color-accent);
}

.metric-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  background-color: var(--color-hover);
  border: 1px solid var(--color-line);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #2E9E5B;
}

/* 核心优势板块 3 个卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  border: 1px solid var(--color-line);
  padding: 2.25rem 1.85rem;
  background-color: var(--color-bg);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  background-color: var(--color-hover);
  border-color: var(--color-text-main);
}

.feature-card-num {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 0.85rem;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 流媒体与 AI 支持图卡 */
.support-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.support-card {
  border: 1px solid var(--color-line);
  padding: 2.5rem;
  background-color: var(--color-bg);
}

.support-card:hover {
  background-color: var(--color-hover);
}

.support-tag {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--color-line);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.support-card h3 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

.support-card p {
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  font-size: 0.95rem;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.pill-item {
  padding: 0.4rem 0.85rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  font-size: 0.82rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.support-card:hover .pill-item {
  background-color: #FFFFFF;
}

/* 价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  border: 1px solid var(--color-line);
  padding: 2.25rem 1.65rem;
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-fast);
}

.pricing-card:hover {
  background-color: var(--color-hover);
  border-color: var(--color-text-main);
}

.pricing-card.featured {
  border: 1px solid var(--color-accent);
}

.featured-flag {
  position: absolute;
  top: -12px;
  right: 1.5rem;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.65rem;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.25rem;
  margin-bottom: 0.4rem;
}

.plan-summary {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-line);
}

.currency-sym {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.price-number {
  font-size: 2.75rem;
  line-height: 1;
}

.price-cycle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.plan-specs {
  flex-grow: 1;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.plan-specs li {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.plan-specs li strong {
  color: var(--color-text-main);
}

.spec-check {
  width: 14px;
  height: 14px;
  stroke: var(--color-accent);
  stroke-width: 2.2;
  fill: none;
  flex-shrink: 0;
}

/* 用户评价 Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.testimonial-card {
  border: 1px solid var(--color-line);
  padding: 2.25rem 1.85rem;
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-card:hover {
  background-color: var(--color-hover);
}

.testimonial-quote {
  font-size: 0.98rem;
  color: var(--color-text-main);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

.testimonial-author {
  border-top: 1px solid var(--color-line);
  padding-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.author-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.author-role {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.author-rating {
  color: var(--color-accent);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
}

/* 常见问题 FAQ */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  border-top: 1px solid var(--color-line);
}

.faq-item {
  border-bottom: 1px solid var(--color-line);
  padding: 1.75rem 0;
}

.faq-question {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.faq-q-tag {
  color: var(--color-accent);
  font-family: var(--font-serif);
  font-size: 1.1rem;
}

.faq-answer {
  padding-left: 2rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* 呼吁转化条 CTA Bar */
.cta-banner {
  padding: 5rem 0;
  border-bottom: 1px solid var(--color-line);
  text-align: center;
  background-color: var(--color-hover);
}

.cta-banner h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-banner p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 620px;
  margin: 0 auto 2.25rem;
}

.cta-banner .cta-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* 页脚 Footer - 严格只保留四个链接标题，点击在新页面打开 */
.site-footer {
  padding: 4rem 0 3.5rem;
  background-color: var(--color-bg);
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-line);
}

.footer-nav a {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  position: relative;
  transition: color var(--transition-fast);
}

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

.footer-copy {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 资讯与文章阅读页专用样式 */
.article-header {
  padding: 4.5rem 0 3rem;
  border-bottom: 1px solid var(--color-line);
}

.article-header h1 {
  font-size: 2.5rem;
  line-height: 1.3;
  margin-bottom: 1.25rem;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.article-body {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-main);
}

.article-body h2 {
  font-size: 1.75rem;
  margin-top: 3rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 0.6rem;
}

.article-body h3 {
  font-size: 1.35rem;
  margin-top: 2rem;
  margin-bottom: 0.85rem;
}

.article-body p {
  margin-bottom: 1.5rem;
  color: #2D2923;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.75rem;
  padding-left: 1.5rem;
}

.article-body li {
  list-style: disc;
  margin-bottom: 0.5rem;
  color: var(--color-text-muted);
}

.article-body strong {
  color: var(--color-text-main);
}

.article-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a:hover {
  color: #C9421A;
}

.article-highlight-box {
  background-color: var(--color-hover);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  padding: 1.5rem;
  margin: 2rem 0;
}

.article-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 2.5rem;
}

.article-card {
  border: 1px solid var(--color-line);
  padding: 2rem;
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.article-card:hover {
  background-color: var(--color-hover);
  border-color: var(--color-text-main);
}

.article-card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.article-card h2, .article-card h3 {
  font-size: 1.35rem;
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.article-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-line);
  padding-top: 1rem;
}

/* 规范页面（关于我们、条款、隐私） */
.policy-page {
  max-width: 860px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 6rem;
}

.policy-page h1 {
  font-size: 2.6rem;
  margin-bottom: 1rem;
}

.policy-page .policy-lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-line);
}

.policy-section {
  margin-bottom: 3rem;
}

.policy-section h2 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

.policy-section p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

.policy-section ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.policy-section li {
  list-style: square;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

/* 响应式适配 @media - 保证手机端单栏与大点击面积 */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-list-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-content h1 {
    font-size: 2.35rem;
  }
  .support-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none; /* 移动端可精简或通过锚点直接浏览 */
  }
  .nav-cta {
    gap: 0.5rem;
  }
  .btn {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions a {
    width: 100%;
    text-align: center;
  }
  .footer-nav {
    flex-direction: column;
    gap: 1.25rem;
  }
  .section-spacing {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }
}