/* ==========================================================================
   鲤云 (Liyun) - 原生极简高效样式表 (优雅浅色版 / Light Theme)
   零外部依赖 | 纯原生 CSS | 秒级加载 | 移动端极致适配
   ========================================================================== */

:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-focus: #38bdf8;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --accent-cyan: #0284c7;
  --accent-blue: #2563eb;
  --accent-purple: #6366f1;
  --accent-gold: #d97706;
  --accent-coral: #e11d48;
  
  --gradient-brand: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
  --gradient-accent: linear-gradient(135deg, #f43f5e 0%, #fb923c 100%);
  --gradient-card: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --shadow-glow: 0 10px 30px rgba(2, 132, 199, 0.16);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 8px -2px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 12px 30px -4px rgba(15, 23, 42, 0.12), 0 4px 12px -2px rgba(15, 23, 42, 0.06);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --container-max: 1200px;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(2, 132, 199, 0.08), transparent 70%),
    radial-gradient(ellipse 60% 40% at 90% 50%, rgba(99, 102, 241, 0.05), transparent 70%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

img, svg {
  vertical-align: middle;
  display: inline-block;
}

/* ================= 通用容器与布局 ================= */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 90px 0;
  position: relative;
}

.section.section-alt {
  background-color: #f1f5f9;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-cyan);
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ================= 按钮与 CTA 规范 ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 16px;
  padding: 14px 28px;
  min-height: 50px;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.38);
  filter: brightness(1.05);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px 18px;
  min-height: 38px;
  font-size: 14px;
  border-radius: var(--radius-sm);
}

/* ================= 导航条 (Header) ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

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

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: var(--gradient-brand);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.3);
  overflow: hidden;
}

.logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

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

.nav-menu a {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ================= 主视觉区 (Hero) ================= */
.hero {
  padding: 90px 0 70px 0;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  border-radius: var(--radius-full);
  font-size: 13px;
  color: #0369a1;
  margin-bottom: 24px;
  font-weight: 600;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 6px #10b981;
}

.hero-title {
  font-size: 54px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
  color: var(--text-main);
}

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

.hero-subtitle {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  max-width: 840px;
  margin: 0 auto;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
}

.trust-item svg {
  color: var(--accent-cyan);
}

/* ================= 主视觉美图展示卡片 (Hero Showcase) ================= */
.hero-showcase {
  max-width: 960px;
  margin: 42px auto 0 auto;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px -12px rgba(15, 23, 42, 0.16), 0 0 35px rgba(2, 132, 199, 0.14);
  border: 1px solid rgba(2, 132, 199, 0.22);
  background: #ffffff;
}

.hero-showcase-img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-showcase:hover .hero-showcase-img {
  transform: scale(1.02);
}

.hero-showcase-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(15, 23, 42, 0.82) 100%);
  padding: 36px 24px 18px 24px;
  color: #ffffff;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.hero-showcase-title {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.hero-showcase-tag {
  font-size: 12px;
  color: #e0f2fe;
  background: rgba(2, 132, 199, 0.45);
  border: 1px solid rgba(56, 189, 248, 0.5);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-weight: 600;
  backdrop-filter: blur(8px);
}

@media (max-width: 600px) {
  .hero-showcase {
    margin-top: 28px;
    border-radius: var(--radius-md);
  }
  .hero-showcase-bar {
    padding: 16px 14px 12px 14px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .hero-showcase-title {
    font-size: 13.5px;
  }
}

/* ================= 核心优势 (Features) ================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: #93c5fd;
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent-cyan);
}

.feature-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ================= 流媒体与 AI 支持 (Media & AI) ================= */
.support-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.support-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.support-panel.ai-panel {
  border-color: #c7d2fe;
}

.support-panel.media-panel {
  border-color: #fecdd3;
}

.support-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.support-panel.ai-panel .support-tag {
  background: #e0e7ff;
  color: #4338ca;
}

.support-panel.media-panel .support-tag {
  background: #ffe4e6;
  color: #be123c;
}

.support-heading {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.support-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.support-badges-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.badge-item:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.badge-icon {
  font-size: 18px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.badge-info h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

.badge-info p {
  font-size: 11px;
  color: var(--text-muted);
}

/* ================= 套餐价格对比表 (Pricing) ================= */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  border-color: #93c5fd;
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.pricing-card.featured {
  background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 100%);
  border: 2px solid var(--accent-cyan);
  box-shadow: var(--shadow-glow);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-4px);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.plan-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 38px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
}

.amount {
  font-size: 44px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.period {
  font-size: 14px;
  color: var(--text-dim);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: #334155;
}

.plan-features li svg {
  color: #10b981;
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-guarantee {
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

/* ================= 用户评价 (Testimonials) ================= */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
}

.review-stars {
  color: var(--accent-gold);
  font-size: 16px;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 14px;
  color: #334155;
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: normal;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #e0f2fe;
  border: 1px solid #bae6fd;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
  color: var(--accent-cyan);
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

.user-role {
  font-size: 12px;
  color: var(--text-dim);
}

/* ================= 常见问题解答 (FAQ) ================= */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.03);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.faq-item[open] {
  border-color: #93c5fd;
  box-shadow: var(--shadow-card);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 24px 22px 24px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ================= 底部促转化条 (Bottom CTA) ================= */
.bottom-cta {
  background: linear-gradient(180deg, var(--bg-main) 0%, #e2e8f0 100%);
  border-top: 1px solid var(--border-color);
  text-align: center;
  padding: 80px 0;
}

.bottom-cta-box {
  background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
  border: 1px solid #bae6fd;
  border-radius: var(--radius-lg);
  padding: 60px 32px;
  max-width: 860px;
  margin: 0 auto;
  box-shadow: var(--shadow-card);
}

.bottom-cta-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

.bottom-cta-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto 32px auto;
}

/* ================= 页脚 (Footer) - 严格保留四个标题 ================= */
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 44px 0 32px 0;
  margin-top: auto;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.footer-nav a:hover {
  color: var(--accent-cyan);
  background: #f1f5f9;
}

.footer-copy {
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

/* ================= 独立子页面通用样式 (Subpages) ================= */
.page-container {
  max-width: 860px;
  margin: 40px auto 80px auto;
  padding: 0 24px;
}

.page-header {
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-muted);
  font-size: 15px;
}

.page-content {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  color: #334155;
  font-size: 15px;
  line-height: 1.8;
  box-shadow: var(--shadow-card);
}

.page-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin: 32px 0 14px 0;
  padding-left: 12px;
  border-left: 4px solid var(--accent-cyan);
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  margin: 20px 0 10px 0;
}

.page-content p {
  margin-bottom: 16px;
}

.page-content ul {
  padding-left: 20px;
  margin-bottom: 20px;
}

.page-content li {
  margin-bottom: 8px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-cyan);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 20px;
}

.back-link:hover {
  text-decoration: underline;
}

/* ================= 移动端响应式适配 (@media 媒体查询) ================= */
@media (max-width: 992px) {
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .hero {
    padding: 50px 0 40px 0;
  }

  .hero-title {
    font-size: 34px;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 16px;
    margin-bottom: 28px;
  }

  .section-title {
    font-size: 26px;
  }

  .nav-menu {
    display: none;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .hero-trust-badges {
    gap: 16px;
    justify-content: flex-start;
  }

  .features-grid,
  .support-container,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .support-badges-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card {
    padding: 30px 22px;
  }

  .page-content {
    padding: 26px 20px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .footer-nav a {
    display: block;
    width: 100%;
    text-align: center;
    padding: 10px;
  }

  .btn {
    min-height: 48px;
    padding: 12px 20px;
    font-size: 15px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-pill {
    font-size: 12px;
    padding: 5px 12px;
  }

  .amount {
    font-size: 38px;
  }
}