/* ==========================================================================
   轻语机场 (qingyujc.mom) 官方网站样式表
   视觉主题：第 81 龙猫森林 × 第 100 生成艺术粒子
   特点：原生平滑纵向滚动、高质感暗夜翡翠绿系、毛玻璃卡片、全设备响应式
   ========================================================================== */

:root {
  /* 品牌核心色彩 - 龙猫森林 × 翡翠微光 */
  --bg-main: #070d0a;
  --bg-card: rgba(13, 23, 18, 0.72);
  --bg-card-hover: rgba(18, 33, 26, 0.88);
  --bg-card-featured: rgba(14, 30, 23, 0.85);
  
  --primary: #10b981;
  --primary-light: #34d399;
  --primary-dark: #059669;
  --primary-deep: #064e3b;
  --primary-glow: rgba(16, 185, 129, 0.28);
  --primary-subtle: rgba(16, 185, 129, 0.08);

  --accent-cyan: #06b6d4;
  --accent-mint: #6ee7b7;
  --text-main: #f3fdf8;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-subtle: rgba(16, 185, 129, 0.16);
  --border-focus: rgba(52, 211, 153, 0.45);
  --border-strong: rgba(16, 185, 129, 0.35);

  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 35px rgba(16, 185, 129, 0.18);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.15s ease;
}

/* 基础重置 */
*, *::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);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
  background: 
    radial-gradient(circle at 15% 10%, rgba(16, 185, 129, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 85% 65%, rgba(6, 182, 212, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(5, 150, 105, 0.06) 0%, transparent 60%),
    #070d0a;
}

body.menu-open {
  overflow: hidden;
}

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

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

button, input, textarea, select {
  font-family: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* 容器定义 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 锚点偏移防止固定导航遮挡 */
section[id] {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

/* ==========================================================================
   1. 固定顶部导航 (Sticky Header)
   ========================================================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), border-bottom var(--transition-normal), box-shadow var(--transition-normal);
  background: rgba(7, 13, 10, 0.65);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(16, 185, 129, 0.1);
}

.site-nav.scrolled {
  background: rgba(7, 13, 10, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(16, 185, 129, 0.22);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  z-index: 1002;
}

.nav-logo-svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 8px rgba(16, 185, 129, 0.4));
  transition: transform var(--transition-normal);
}

.nav-brand:hover .nav-logo-svg {
  transform: rotate(15deg) scale(1.08);
}

.brand-text-box {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-size: 0.68rem;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.16);
  border: 1px solid var(--border-subtle);
  color: var(--primary-light);
  font-weight: 500;
}

.brand-slogan {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* 导航链接集合 */
.nav-menu-wrapper {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 0.92rem;
  color: #cbd5e1;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10px;
  right: 10px;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
  box-shadow: 0 0 8px var(--primary);
}

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

/* 立即前往注册 核心按钮 */
.btn-cta-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  color: #042416;
  background: linear-gradient(135deg, #34d399 0%, #10b981 50%, #059669 100%);
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
}

.btn-cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.55);
  filter: brightness(1.06);
  color: #021a0f;
}

.btn-cta-primary:active {
  transform: translateY(0);
}

.btn-cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  color: #e2e8f0;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-cta-secondary:hover {
  background: rgba(16, 185, 129, 0.16);
  border-color: var(--border-strong);
  color: #fff;
  transform: translateY(-2px);
}

/* 汉堡按钮 */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1002;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px auto;
  background: #cbd5e1;
  transition: all 0.3s ease-in-out;
  border-radius: 2px;
}

.mobile-toggle.is-active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--primary-light);
}

.mobile-toggle.is-active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.is-active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--primary-light);
}

.nav-backdrop {
  display: none;
}

/* ==========================================================================
   2. 首屏 Hero 区域 (生成艺术 × 龙猫微风)
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 40px) 0 60px 0;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: auto;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.28);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--primary-light);
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--primary-light);
  box-shadow: 0 0 10px var(--primary-light);
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 10px rgba(52, 211, 153, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

.hero-h1 {
  font-size: clamp(2.4rem, 5.2vw, 3.8rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  color: #fff;
}

.text-gradient {
  background: linear-gradient(135deg, #a7f3d0 0%, #34d399 50%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.22rem);
  color: #94a3b8;
  max-width: 680px;
  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-cta-group .btn-cta-primary {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.hero-cta-group .btn-cta-secondary {
  padding: 14px 28px;
  font-size: 1.05rem;
}

/* 信任指标徽章行 */
.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px;
  background: rgba(13, 23, 18, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ==========================================================================
   通用区块标题与卡片样式 (上下纵向滚动过渡)
   ========================================================================== */
.section-block {
  padding: 90px 0;
  position: relative;
}

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

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary-light);
  margin-bottom: 12px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid var(--border-subtle);
  padding: 4px 14px;
  border-radius: var(--radius-full);
}

.section-title {
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 毛玻璃高光卡片 */
.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4), 0 0 24px rgba(16, 185, 129, 0.12);
}

/* ==========================================================================
   第 2 区：品牌优势与知识专题 (#knowledge)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-light);
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
}

.feature-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 知识专题快捷入口条目 */
.knowledge-banner {
  margin-top: 40px;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12) 0%, rgba(6, 78, 59, 0.18) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 28px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.knowledge-banner-text h3 {
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 6px;
}

.knowledge-banner-text p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* ==========================================================================
   第 3 区：套餐价格展示 (#plans) 严格核对截图
   ========================================================================== */
.pricing-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 48px;
}

.cycle-tabs-container {
  display: inline-flex;
  padding: 5px;
  background: rgba(13, 23, 18, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  gap: 4px;
}

.cycle-tab-btn {
  padding: 8px 20px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cycle-tab-btn.active {
  background: var(--primary);
  color: #042416;
  font-weight: 600;
  box-shadow: 0 2px 10px rgba(16, 185, 129, 0.4);
}

.cycle-badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 8px;
  margin-left: 4px;
  background: rgba(0, 0, 0, 0.15);
}

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

/* 套餐卡片：轻量套餐、畅享套餐、专业套餐 */
.plan-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  backdrop-filter: blur(14px);
}

.plan-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
}

/* 官方选择（畅享套餐）高亮推荐样式 */
.plan-card.featured {
  background: var(--bg-card-featured);
  border: 2px solid #10b981;
  box-shadow: 0 10px 40px rgba(16, 185, 129, 0.22);
}

.featured-ribbon {
  position: absolute;
  top: 18px;
  right: 20px;
  background: linear-gradient(135deg, #0284c7 0%, #0ea5e9 100%);
  color: #fff;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
  box-shadow: 0 2px 8px rgba(14, 165, 233, 0.4);
}

.plan-header {
  margin-bottom: 24px;
}

.plan-index {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.plan-name {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* 特性列表 */
.plan-features {
  margin: 28px 0;
  padding: 20px 0;
  border-top: 1px dashed rgba(16, 185, 129, 0.15);
  border-bottom: 1px dashed rgba(16, 185, 129, 0.15);
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: #e2e8f0;
  margin-bottom: 14px;
}

.plan-feature-item:last-child {
  margin-bottom: 0;
}

.check-icon {
  color: var(--primary-light);
  font-weight: 700;
  font-size: 1rem;
}

/* 价格区域 */
.plan-price-box {
  margin-bottom: 28px;
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  vertical-align: top;
  line-height: 1;
}

.price-number {
  font-size: 2.7rem;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.price-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.price-sub-note {
  font-size: 0.78rem;
  color: var(--primary-light);
  margin-top: 4px;
  min-height: 18px;
}

.plan-cta-btn {
  width: 100%;
  padding: 13px 20px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.plan-card:not(.featured) .plan-cta-btn {
  background: rgba(16, 185, 129, 0.1);
  color: #a7f3d0;
  border: 1px solid var(--border-subtle);
}

.plan-card:not(.featured) .plan-cta-btn:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--border-strong);
  color: #fff;
  transform: translateY(-2px);
}

.plan-card.featured .plan-cta-btn {
  background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
  color: #042416;
  border: none;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
}

.plan-card.featured .plan-cta-btn:hover {
  filter: brightness(1.08);
  box-shadow: 0 6px 22px rgba(16, 185, 129, 0.6);
  transform: translateY(-2px);
}

/* ==========================================================================
   第 4 区：使用教程与配置步骤 (#tutorial / #timeline)
   ========================================================================== */
.tutorial-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.tutorial-step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: relative;
  transition: transform var(--transition-normal);
}

.tutorial-step-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
}

.step-num-badge {
  font-size: 0.85rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--primary-light);
  background: rgba(16, 185, 129, 0.15);
  border-radius: var(--radius-sm);
  display: inline-block;
  padding: 4px 10px;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 客户端支持矩阵展示 */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  background: rgba(13, 23, 18, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.client-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.client-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(16, 185, 129, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-light);
}

.client-name {
  font-size: 0.96rem;
  font-weight: 600;
  color: #fff;
}

.client-sub {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================================================
   第 5 区：原创知识文章系统 (#articles)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35), 0 0 20px rgba(16, 185, 129, 0.1);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.article-tag {
  color: var(--primary-light);
  background: rgba(16, 185, 129, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  line-height: 1.4;
  transition: color var(--transition-fast);
}

.article-card:hover .article-title {
  color: var(--primary-light);
}

.article-excerpt {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--primary-light);
  font-weight: 600;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

/* ==========================================================================
   第 6 区：真实用户评价与口碑展示 (#feedback) 6宫格卡片布局
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: rgba(13, 23, 18, 0.72);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
}

.testimonial-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-strong);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45), 0 0 24px rgba(16, 185, 129, 0.12);
}

.testimonial-stars {
  color: #f59e0b;
  font-size: 1.15rem;
  letter-spacing: 3px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
}

.testimonial-quote {
  font-size: 0.94rem;
  color: #cbd5e1;
  line-height: 1.75;
  margin-bottom: 26px;
  flex-grow: 1;
}

.testimonial-author-box {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  flex-shrink: 0;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.3);
}

.author-avatar.avatar-emerald {
  background: linear-gradient(135deg, #10b981 0%, #047857 100%);
  box-shadow: 0 2px 10px rgba(16, 185, 129, 0.3);
}

.author-meta {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 3px;
}

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

/* ==========================================================================
   第 7 区：常见问题 FAQ (#faq)
   ========================================================================== */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.is-open {
  border-color: var(--border-strong);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.3);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--primary-light);
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.is-open .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--primary-light);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  background: rgba(0, 0, 0, 0.15);
}

.faq-answer-inner {
  padding: 0 24px 20px 24px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-answer-inner a {
  color: var(--primary-light);
  text-decoration: underline;
}

/* ==========================================================================
   第 8 区：语义化页脚 (Footer)
   ========================================================================== */
.site-footer {
  background: #040806;
  border-top: 1px solid rgba(16, 185, 129, 0.15);
  padding: 70px 0 35px 0;
  position: relative;
  z-index: 10;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-box .brand-title {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  max-width: 320px;
  line-height: 1.65;
  margin-bottom: 20px;
}

.footer-links-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-links-list li {
  margin-bottom: 10px;
}

.footer-links-list a {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-links-list a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-disclaimer {
  max-width: 600px;
  line-height: 1.5;
}

/* 返回顶部按钮 */
.back-to-top-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(13, 23, 18, 0.85);
  border: 1px solid var(--border-strong);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 990;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.back-to-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-btn:hover {
  background: var(--primary);
  color: #042416;
  transform: translateY(-3px);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

/* ==========================================================================
   滚动入场动画 (IntersectionObserver 驱动)
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* 错落延迟修饰 */
.delay-1 { transition-delay: 0.08s; }
.delay-2 { transition-delay: 0.16s; }
.delay-3 { transition-delay: 0.24s; }
.delay-4 { transition-delay: 0.32s; }

/* 用户设置减少动态偏好 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ==========================================================================
   移动端与多尺寸响应式适配 (320px, 360px, 375px, 428px, 768px, 1024px)
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }

  .plan-card.featured {
    order: -1; /* 手机端优先展示推荐套餐 */
  }

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

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

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

@media (max-width: 768px) {
  .site-nav {
    height: 64px;
  }

  .mobile-toggle {
    display: block;
  }

  .nav-menu-wrapper {
    position: fixed;
    top: 64px;
    right: 0;
    width: 280px;
    height: calc(100vh - 64px);
    background: rgba(7, 13, 10, 0.98);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--border-subtle);
    padding: 30px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1001;
    overflow-y: auto;
  }

  .nav-menu-wrapper.is-open {
    transform: translateX(0);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.7);
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .nav-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 12px;
  }

  .nav-link {
    width: 100%;
    padding: 10px 12px;
    font-size: 1.05rem;
  }

  .nav-actions {
    width: 100%;
    margin-top: 10px;
  }

  .nav-actions .btn-cta-primary {
    width: 100%;
  }

  .hero-section {
    min-height: auto;
    padding: 110px 0 50px 0;
  }

  .hero-stats-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .tutorial-steps-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .pricing-controls {
    overflow-x: auto;
    padding-bottom: 8px;
    justify-content: flex-start;
  }

  .cycle-tabs-container {
    white-space: nowrap;
  }

  .cycle-tab-btn {
    padding: 7px 14px;
    font-size: 0.82rem;
  }
}

@media (max-width: 375px) {
  .container {
    padding: 0 16px;
  }

  .hero-h1 {
    font-size: 2.1rem;
  }

  .plan-card {
    padding: 24px 18px;
  }

  .btn-cta-primary, .btn-cta-secondary {
    width: 100%;
  }
}