/* ==========================================================================
   老头VPN (laotouvpn.ink) - 中国风水墨禅意 · 极简留白视觉样式表
   配色：宣纸米白 #F5F0E8 | 墨黑 #2C2C2C | 赭石红 #8B4513 | 淡墨灰 #A0A0A0
/* 排版结构与栅格严格保持不变 · 纯原生 CSS · 极慢节奏水墨动效
   ========================================================================== */

:root {
  /* 核心水墨配色规范 */
  --bg-paper: #F5F0E8;           /* 宣纸米白主背景 */
  --bg-card: rgba(255, 253, 249, 0.88); /* 柔和宣纸白卡片 */
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-nav: rgba(245, 240, 232, 0.92);  /* 半透宣纸顶部导航 */
  
  --color-ink-deep: #2C2C2C;     /* 主色：焦墨黑 */
  --color-ink-mid: #4A4A4A;      /* 浓墨灰 */
  --color-ink-light: #737373;    /* 中墨灰 */
  --color-ink-pale: #A0A0A0;     /* 辅助：淡墨灰 */
  
  --color-seal: #8B4513;         /* 强调色：赭石红 / 朱砂印章红 */
  --color-seal-dark: #70330D;    /* 深赭石 */
  --color-seal-glow: rgba(139, 69, 19, 0.25);
  
  --border-ink: rgba(44, 44, 44, 0.12); /* 墨线淡边框 */
  --border-ink-strong: rgba(44, 44, 44, 0.28);
  --border-seal: rgba(139, 69, 19, 0.45);
  
  --radius-btn: 4px;             /* 规范要求：CTA 按钮圆角 4px */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  
  --shadow-paper: 0 4px 20px -2px rgba(44, 44, 44, 0.05);
  --shadow-hover: 0 12px 30px -4px rgba(44, 44, 44, 0.1);
  --shadow-seal: 0 4px 16px rgba(139, 69, 19, 0.35);
  
  /* 字体规范：标题书法行楷，正文思源宋体 */
  --font-brush: 'Ma Shan Zheng', 'LXGW WenKai', 'Zhi Mang Xing', 'STKaiti', 'KaiTi', serif;
  --font-body: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', serif;
  
  --transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-paper);
  color: var(--color-ink-deep);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  line-height: 1.8;
  overflow-x: hidden;
  background-color: var(--bg-paper);
  /* 宣纸微黄温润渐变底色 */
  background-image: 
    radial-gradient(ellipse at 50% 10%, rgba(255, 255, 255, 0.6) 0%, rgba(240, 232, 218, 0.4) 60%, rgba(232, 222, 204, 0.7) 100%);
  min-height: 100vh;
  position: relative;
}

/* 全屏宣纸纹理噪点遮罩 (SVG Noise Grain) */
.paper-texture-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* 背景水墨晕染圆斑容器 (四角缓慢扩散收缩，8-12秒极慢循环) */
.ink-blobs-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ink-blob {
  position: absolute;
  border-radius: 50%;
  filter: url(#ink-blur-filter);
  opacity: 0.07;
  background: radial-gradient(circle, #1a1a1a 0%, #3a3a3a 45%, transparent 70%);
  will-change: transform, opacity;
}

.ink-blob-1 {
  top: -80px;
  left: -80px;
  width: 520px;
  height: 520px;
  animation: inkBreathe1 11s ease-in-out infinite alternate;
}

.ink-blob-2 {
  top: 40px;
  right: -100px;
  width: 600px;
  height: 600px;
  opacity: 0.055;
  animation: inkBreathe2 12s ease-in-out infinite alternate;
}

.ink-blob-3 {
  bottom: 120px;
  left: -120px;
  width: 560px;
  height: 560px;
  opacity: 0.06;
  animation: inkBreathe3 10s ease-in-out infinite alternate;
}

.ink-blob-4 {
  bottom: -60px;
  right: -60px;
  width: 480px;
  height: 480px;
  opacity: 0.065;
  animation: inkBreathe1 9.5s ease-in-out infinite alternate-reverse;
}

@keyframes inkBreathe1 {
  0% { transform: scale(0.85) translate(0, 0); opacity: 0.05; }
  50% { opacity: 0.09; }
  100% { transform: scale(1.22) translate(30px, 20px); opacity: 0.06; }
}

@keyframes inkBreathe2 {
  0% { transform: scale(1.18) translate(0, 0); opacity: 0.07; }
  50% { opacity: 0.04; }
  100% { transform: scale(0.82) translate(-25px, 25px); opacity: 0.08; }
}

@keyframes inkBreathe3 {
  0% { transform: scale(0.9) translate(0, 0); opacity: 0.045; }
  100% { transform: scale(1.25) translate(35px, -20px); opacity: 0.075; }
}

/* 底部水墨山水剪影 (缓慢横向漂移，节奏极慢) */
.ink-mountains-silhouette {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 200%;
  height: 180px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
  background-repeat: repeat-x;
  background-position: bottom left;
  background-size: 1400px 180px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1400 180' fill='%232C2C2C'%3E%3Cpath d='M0,180 L0,140 Q150,60 320,110 T650,70 Q780,20 920,80 T1200,50 Q1300,90 1400,60 L1400,180 Z' opacity='0.55'/%3E%3Cpath d='M0,180 L0,155 Q200,95 420,135 T800,110 Q980,80 1120,130 T1400,105 L1400,180 Z' opacity='0.85'/%3E%3C/svg%3E");
  animation: mountainDrift 60s linear infinite;
}

@keyframes mountainDrift {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* 内容层置于背景之上 */
.page-wrapper {
  position: relative;
  z-index: 2;
}

/* 链接基础样式 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

/* 键盘导航清晰焦点样式 (符合 WCAG 2.1 无障碍标准) */
:focus-visible {
  outline: 2px solid var(--color-seal);
  outline-offset: 3px;
}

/* 跳至主要内容无障碍入口 (默认视觉隐藏，Tab 键盘聚焦时滑入显示) */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  z-index: 10000;
  background: var(--color-ink-deep);
  color: #F5F0E8 !important;
  padding: 12px 22px;
  border-radius: var(--radius-btn);
  border: 2px solid var(--color-seal);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(44, 44, 44, 0.35);
  transition: top 0.2s ease-in-out;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 16px;
  outline: none;
}

/* 页面内锚点与区块滚动边距 (防止 76px 固定吸顶导航栏遮挡标题) */
section[id],
.section[id],
main[id],
article[id],
#main,
#features,
#streaming-ai,
#pricing,
#reviews,
#faq {
  scroll-margin-top: 96px;
}

/* 容器定义 (保持原有栅格宽度) */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部导航条 (水墨禅意风) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-ink);
  height: 76px;
  display: flex;
  align-items: center;
  transition: var(--transition);
}

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

/* 品牌 Logo 区域 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-brush);
  font-size: 1.65rem;
  font-weight: 900;
  color: var(--color-ink-deep);
  letter-spacing: 1px;
}

.brand-logo .logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--color-ink-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #F5F0E8;
  border: 1px solid var(--border-ink-strong);
  box-shadow: 0 2px 8px rgba(44, 44, 44, 0.15);
}

.brand-logo .brand-badge {
  font-family: var(--font-body);
  font-size: 0.72rem;
  background: rgba(139, 69, 19, 0.08);
  color: var(--color-seal);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-seal);
  font-weight: 600;
  letter-spacing: 0.5px;
}

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

.nav-links a {
  font-size: 0.96rem;
  color: var(--color-ink-mid);
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a:hover {
  color: var(--color-seal);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-seal);
  transition: var(--transition);
  transform: translateX(-50%);
}

.nav-links a:hover::after {
  width: 80%;
}

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

/* ==========================================================================
   CTA 按钮系统 (规范：墨黑色填充，hover变为赭石红印章色，圆角4px，水墨溅射边缘)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  border-radius: var(--radius-btn); /* 严格限制 4px 圆角 */
  padding: 12px 28px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.28s ease;
  text-align: center;
  white-space: nowrap;
  min-height: 46px;
  position: relative;
  overflow: visible;
}

/* 主按钮：墨黑色填充 */
.btn-primary {
  background-color: var(--color-ink-deep);
  color: #F5F0E8;
  border-color: var(--color-ink-deep);
  box-shadow: 0 3px 10px rgba(44, 44, 44, 0.2);
}

/* Hover 时转为印章赭石红，并具有水墨溅射散晕效果 */
.btn-primary:hover {
  background-color: var(--color-seal);
  border-color: var(--color-seal);
  color: #FFFFFF;
  transform: translateY(-2px);
  /* 水墨溅射扩散晕染阴影 */
  box-shadow: 
    0 0 0 2px rgba(139, 69, 19, 0.25),
    0 6px 20px rgba(139, 69, 19, 0.35),
    inset 0 0 10px rgba(0, 0, 0, 0.15);
}

/* 次级按钮：素雅宣纸墨线风格 */
.btn-secondary {
  background: rgba(255, 255, 255, 0.6);
  color: var(--color-ink-deep);
  border: 1px solid var(--border-ink-strong);
}

.btn-secondary:hover {
  background: #FFFFFF;
  border-color: var(--color-seal);
  color: var(--color-seal);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(139, 69, 19, 0.15);
}

.btn-lg {
  padding: 14px 38px;
  font-size: 1.1rem;
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   主视觉区 (Hero Section) - 水墨大标题 + 副标题 + 右侧圆形印章盖章动效
   ========================================================================== */
.hero-section {
  padding: 80px 0 65px;
  position: relative;
}

/* 顶部宣纸雅致印鉴药丸 */
.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 18px;
  background: rgba(139, 69, 19, 0.06);
  border: 1px solid var(--border-seal);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--color-seal);
  margin-bottom: 24px;
  font-weight: 500;
}

/* 主视觉标题与印章并排排版 (保持原有结构同时美化布局) */
.hero-header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  margin-bottom: 24px;
}

.hero-text-col {
  flex: 1;
}

/* H1 大标题：毛笔书法字体 */
.hero-headline {
  font-family: var(--font-brush);
  font-size: clamp(2.6rem, 5.5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-ink-deep);
  letter-spacing: 1.5px;
  margin-bottom: 14px;
  text-shadow: 0 2px 4px rgba(44, 44, 44, 0.08);
}

.hero-headline .gradient-text {
  color: var(--color-ink-deep);
  background: none;
  -webkit-text-fill-color: initial;
}

/* 副标题：以静制动，大象无形 */
.hero-motto {
  font-family: var(--font-brush);
  font-size: 1.45rem;
  color: var(--color-seal);
  margin-bottom: 18px;
  letter-spacing: 2px;
  display: block;
}

/* 简介文本 */
.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--color-ink-mid);
  line-height: 1.85;
  margin-bottom: 34px;
  max-width: 780px;
}

/* ==========================================================================
   圆形印章 SVG (140px，红色印泥质感，模拟盖章动作落下微抖，6秒淡出重盖)
   ========================================================================== */
.seal-stamp-container {
  flex-shrink: 0;
  width: 140px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.chinese-seal-svg {
  width: 140px;
  height: 140px;
  display: block;
  transform-origin: center center;
  /* 模拟盖章循环：总计约 8 秒一个循环周期（盖下、轻微震颤抖动、定住6秒、淡出再盖） */
  animation: sealStampingLoop 8s cubic-bezier(0.22, 1, 0.36, 1) infinite;
}

@keyframes sealStampingLoop {
  0% {
    opacity: 0;
    transform: scale(1.6) rotate(-8deg);
  }
  /* 极速下落盖印 */
  8% {
    opacity: 1;
    transform: scale(0.96) rotate(0.5deg);
  }
  /* 印章撞击纸张的微抖回弹 */
  11% {
    transform: scale(1.02) rotate(-0.5deg);
  }
  14% {
    transform: scale(1) rotate(0deg);
  }
  /* 盖定平稳展现 6 秒 */
  85% {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
  /* 85% - 100% 优雅淡出并复位重盖 */
  96% {
    opacity: 0;
    transform: scale(1.04) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: scale(1.6) rotate(-8deg);
  }
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 45px;
}

/* 核心信任数据行 (水墨纸张卡片风格) */
.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  padding: 24px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-paper);
}

.stat-item {
  text-align: center;
  border-right: 1px solid var(--border-ink);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-family: var(--font-brush);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-seal);
  display: block;
  letter-spacing: 1px;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--color-ink-light);
  margin-top: 4px;
}

/* 通用区块排版 */
.section {
  padding: 85px 0;
  position: relative;
}

.section-alt {
  background: rgba(240, 234, 224, 0.55);
  border-top: 1px solid var(--border-ink);
  border-bottom: 1px solid var(--border-ink);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-seal);
  letter-spacing: 2px;
  margin-bottom: 10px;
  display: inline-block;
  border-bottom: 1px solid var(--border-seal);
  padding-bottom: 2px;
}

.section-title {
  font-family: var(--font-brush);
  font-size: clamp(2rem, 3.8vw, 2.7rem);
  font-weight: 900;
  line-height: 1.35;
  margin-bottom: 15px;
  color: var(--color-ink-deep);
  letter-spacing: 1px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-ink-light);
  line-height: 1.8;
}

/* ==========================================================================
   核心优势卡片 (3 Cards - 水墨古朴格调)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-paper);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-ink-deep);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  background: var(--bg-card-hover);
  border-color: var(--color-seal);
  box-shadow: var(--shadow-hover);
}

.feature-card:hover::before {
  opacity: 1;
  background: var(--color-seal);
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: rgba(44, 44, 44, 0.05);
  border: 1px solid var(--border-ink-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-seal);
  margin-bottom: 22px;
}

.feature-title {
  font-family: var(--font-brush);
  font-size: 1.55rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-ink-deep);
  letter-spacing: 0.5px;
}

.feature-desc {
  color: var(--color-ink-mid);
  font-size: 0.96rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.feature-tags {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag-item {
  font-size: 0.78rem;
  background: rgba(139, 69, 19, 0.05);
  color: var(--color-seal);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-seal);
}

/* ==========================================================================
   流媒体与 AI 支持卡片 (3 Cards)
   ========================================================================== */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  transition: var(--transition);
  box-shadow: var(--shadow-paper);
}

.unlock-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-seal);
  box-shadow: var(--shadow-hover);
}

.unlock-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.unlock-icon-badge {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  background: rgba(44, 44, 44, 0.05);
  border: 1px solid var(--border-ink-strong);
}

.badge-ai {
  color: var(--color-seal);
  border-color: var(--border-seal);
  background: rgba(139, 69, 19, 0.06);
}

.badge-stream {
  color: #8B263E;
  border-color: rgba(139, 38, 62, 0.3);
  background: rgba(139, 38, 62, 0.06);
}

.badge-game {
  color: #2D5A27;
  border-color: rgba(45, 90, 39, 0.3);
  background: rgba(45, 90, 39, 0.06);
}

.unlock-title {
  font-family: var(--font-brush);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-ink-deep);
}

.unlock-desc {
  color: var(--color-ink-mid);
  font-size: 0.94rem;
  line-height: 1.75;
  margin-bottom: 20px;
}

.unlock-brand-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
}

.brand-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border-ink);
  font-size: 0.84rem;
  color: var(--color-ink-deep);
  font-weight: 500;
}

/* ==========================================================================
   套餐价格对比表 (Pricing) - 真实市场价 · 水墨典雅格调
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 38px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: var(--shadow-paper);
}

.pricing-card.popular {
  border-color: var(--color-seal);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 30px rgba(139, 69, 19, 0.12);
  transform: scale(1.02);
}

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

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-seal);
  color: #FFFFFF;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-sm);
  letter-spacing: 1px;
  box-shadow: 0 3px 10px rgba(139, 69, 19, 0.3);
}

.pricing-header {
  text-align: center;
  margin-bottom: 20px;
}

.plan-name {
  font-family: var(--font-brush);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-ink-deep);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--color-ink-light);
}

.plan-price-box {
  margin: 18px 0;
  text-align: center;
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-seal);
}

.price-amount {
  font-family: var(--font-brush);
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-ink-deep);
}

.price-cycle {
  font-size: 0.9rem;
  color: var(--color-ink-light);
}

.plan-sub-price {
  font-size: 0.85rem;
  color: var(--color-seal);
  margin-top: 6px;
  font-weight: 600;
}

.pricing-features {
  list-style: none;
  margin: 15px 0 30px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.93rem;
  color: var(--color-ink-mid);
  margin-bottom: 13px;
  line-height: 1.5;
}

.pricing-features li svg {
  color: var(--color-seal);
  flex-shrink: 0;
}

.pricing-features li.disabled {
  color: var(--color-ink-pale);
  text-decoration: line-through;
}

.pricing-features li.disabled svg {
  color: var(--color-ink-pale);
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  transition: var(--transition);
  box-shadow: var(--shadow-paper);
}

.review-card:hover {
  border-color: var(--border-ink-strong);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.review-stars {
  color: var(--color-seal);
  margin-bottom: 14px;
  display: flex;
  gap: 3px;
  font-size: 0.9rem;
}

.review-quote {
  font-size: 0.95rem;
  color: var(--color-ink-mid);
  line-height: 1.85;
  margin-bottom: 22px;
  font-style: normal;
}

.reviewer-profile {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--color-ink-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-brush);
  font-weight: 700;
  color: #F5F0E8;
  font-size: 1.15rem;
  border: 1px solid var(--border-ink-strong);
}

.reviewer-info h4 {
  font-size: 0.96rem;
  color: var(--color-ink-deep);
  font-weight: 700;
}

.reviewer-info p {
  font-size: 0.8rem;
  color: var(--color-ink-light);
}

/* ==========================================================================
   常见问题解答 (FAQ 6 Cards - 原生 details/summary)
   ========================================================================== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 1040px;
  margin: 0 auto;
}

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

.faq-item:hover {
  border-color: var(--color-seal);
}

.faq-item summary {
  padding: 20px 24px;
  font-family: var(--font-brush);
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  user-select: none;
  color: var(--color-ink-deep);
}

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

.faq-icon-arrow {
  transition: transform 0.28s ease;
  flex-shrink: 0;
  color: var(--color-seal);
}

.faq-item[open] summary .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 24px 22px;
  color: var(--color-ink-mid);
  font-family: var(--font-body);
  font-size: 0.94rem;
  line-height: 1.85;
  border-top: 1px dashed var(--border-ink);
  padding-top: 14px;
}

/* 底部行动号召 (Bottom CTA Banner) */
.bottom-cta-banner {
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-seal);
  border-radius: var(--radius-md);
  padding: 48px 30px;
  text-align: center;
  margin-top: 60px;
  box-shadow: 0 10px 30px rgba(139, 69, 19, 0.08);
  position: relative;
}

.bottom-cta-banner h3 {
  font-family: var(--font-brush);
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--color-ink-deep);
  margin-bottom: 12px;
}

.bottom-cta-banner p {
  color: var(--color-ink-light);
  font-size: 1.05rem;
  margin-bottom: 26px;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   页脚 (规范：仅保留四个标题链接，内容在新页面展示)
   ========================================================================== */
.footer {
  background: #EAE3D5;
  border-top: 1px solid var(--border-ink-strong);
  padding: 50px 0 35px;
  margin-top: 80px;
  position: relative;
  z-index: 10;
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.footer-nav-list a {
  color: var(--color-ink-deep);
  font-family: var(--font-brush);
  font-size: 1.25rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.footer-nav-list a:hover {
  color: var(--color-seal);
  background: rgba(139, 69, 19, 0.06);
}

.footer-bottom {
  text-align: center;
  color: var(--color-ink-light);
  font-size: 0.86rem;
  border-top: 1px solid var(--border-ink);
  padding-top: 25px;
}

.footer-brand-meta {
  margin-bottom: 8px;
  color: var(--color-ink-mid);
  font-family: var(--font-body);
}

/* ==========================================================================
   二级单页面专属样式 (关于我们、服务条款、隐私政策、网站地图、知识科普)
   ========================================================================== */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-ink);
  background: rgba(240, 234, 224, 0.4);
}

.subpage-title {
  font-family: var(--font-brush);
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 900;
  margin-bottom: 12px;
  color: var(--color-ink-deep);
}

.subpage-subtitle {
  color: var(--color-ink-light);
  font-size: 1.05rem;
}

.content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-md);
  padding: 48px;
  margin: 40px auto 80px;
  max-width: 900px;
  box-shadow: var(--shadow-paper);
}

.content-box h2 {
  font-family: var(--font-brush);
  font-size: 1.7rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--color-seal);
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border-seal);
  padding-bottom: 8px;
}

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

.content-box p {
  color: var(--color-ink-mid);
  line-height: 1.9;
  margin-bottom: 16px;
  font-size: 1rem;
}

.content-box ul, .content-box ol {
  margin: 0 0 22px 24px;
  color: var(--color-ink-mid);
}

.content-box li {
  margin-bottom: 10px;
  line-height: 1.8;
}

.highlight-box {
  background: rgba(139, 69, 19, 0.05);
  border-left: 4px solid var(--color-seal);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
  color: var(--color-ink-deep);
  font-size: 0.96rem;
}

.danger-box {
  background: rgba(139, 38, 62, 0.06);
  border-left: 4px solid #8B263E;
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
  color: #701A2D;
  font-size: 0.96rem;
}

.sitemap-group {
  margin-bottom: 35px;
}

.sitemap-links-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  list-style: none;
  margin-top: 14px;
}

.sitemap-links-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border-ink);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-deep);
  font-weight: 500;
}

.sitemap-links-list a:hover {
  background: #FFFFFF;
  border-color: var(--color-seal);
  color: var(--color-seal);
}

/* ==========================================================================
   全平台响应式适配 (@media 媒体查询)
   手机端完美单栏，触控极其友好，保持原有栅格与排版逻辑不变
   ========================================================================== */

@media (max-width: 992px) {
  .features-grid,
  .unlock-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.popular {
    transform: none;
  }
  
  .pricing-card:hover {
    transform: translateY(-4px);
  }
  
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .stat-item:nth-child(2) {
    border-right: none;
  }
  
  .stat-item {
    border-bottom: 1px solid var(--border-ink);
    padding-bottom: 14px;
  }
  
  .stat-item:nth-child(3),
  .stat-item:nth-child(4) {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .hero-header-wrap {
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .navbar {
    height: auto;
    padding: 10px 0;
  }
  
  .nav-wrap {
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .nav-links {
    display: flex;
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding: 6px 0 4px;
    gap: 12px;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  
  .nav-links a {
    font-size: 0.88rem;
    padding: 8px 14px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    background: rgba(44, 44, 44, 0.05);
    border-radius: var(--radius-sm);
  }
  
  .container {
    padding: 0 16px;
  }
  
  .hero-section {
    padding: 45px 0 35px;
  }
  
  .hero-header-wrap {
    flex-direction: column-reverse;
    align-items: center;
    text-align: center;
    gap: 20px;
  }
  
  .seal-stamp-container {
    width: 120px;
    height: 120px;
  }
  
  .chinese-seal-svg {
    width: 120px;
    height: 120px;
  }
  
  .hero-headline {
    font-size: 2.3rem;
    line-height: 1.3;
  }
  
  .hero-motto {
    font-size: 1.25rem;
  }
  
  .hero-subtitle {
    font-size: 0.98rem;
    margin-bottom: 28px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
    font-size: 1.05rem;
  }
  
  /* 所有卡片在手机端强制变更为单栏流式显示 */
  .features-grid,
  .unlock-grid,
  .pricing-grid,
  .reviews-grid,
  .faq-grid,
  .sitemap-links-list {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  
  .hero-stats-row {
    grid-template-columns: 1fr;
    gap: 15px;
    padding: 18px 14px;
  }
  
  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-ink);
    padding-bottom: 12px;
  }
  
  .stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .feature-card,
  .unlock-card,
  .pricing-card,
  .review-card,
  .content-box {
    padding: 26px 20px;
  }
  
  .section {
    padding: 50px 0;
  }
  
  .section-header {
    margin-bottom: 35px;
  }
  
  .section-title {
    font-size: 1.85rem;
  }
  
  .footer-nav-list {
    flex-direction: column;
    gap: 12px;
  }
  
  .footer-nav-list a {
    width: 100%;
    text-align: center;
    justify-content: center;
    background: rgba(44, 44, 44, 0.04);
    padding: 10px;
  }
  
  .bottom-cta-banner {
    padding: 34px 18px;
  }
  
  .bottom-cta-banner h3 {
    font-size: 1.6rem;
  }
}

@media (max-width: 380px) {
  .hero-headline {
    font-size: 1.95rem;
  }
  .price-amount {
    font-size: 2.6rem;
  }
}

/* ==========================================================================
   无障碍动效减弱偏好 (prefers-reduced-motion)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .ink-blob {
    animation: none !important;
  }
  
  .chinese-seal-svg {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  
  .ink-mountains-silhouette {
    animation: none !important;
  }
}