/* ===================================================================
   耶耶云 YeYeYun - 孟菲斯几何 + 大胆撞色 + 趣味活力 核心样式库
   =================================================================== */

/* 键盘快速访问：跳转到主要内容入口 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--accent-yellow);
  color: var(--dark-black);
  padding: 12px 24px;
  font-weight: 800;
  font-size: 1rem;
  border: var(--border-thick);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-btn);
  z-index: 10000;
  text-decoration: none;
  transition: top 0.15s ease-in-out;
}
.skip-link:focus-visible,
.skip-link:focus {
  top: 18px;
  outline: 3px dashed var(--dark-black);
  outline-offset: 3px;
}

/* 键盘可访问性：高对比度焦点样式 */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px dashed var(--dark-black);
  outline-offset: 3px;
}

/* 固定页眉防遮挡锚点偏移 */
section[id],
h2[id],
h3[id],
[id] {
  scroll-margin-top: 85px;
}

:root {
  /* 孟菲斯撞色调色板 */
  --bg-primary: #FFF8F0;      /* 米黄主背景 */
  --bg-card: #FFFFFF;         /* 卡片背景白 */
  --bg-card-alt: #FFFDF9;     /* 备用浅米白 */
  --text-main: #1A1A2E;       /* 浓黑文字 */
  --text-muted: #4B4B60;      /* 次级文字 */
  --text-dim: #717188;        /* 说明微字 */
  
  --primary-pink: #FF6B9D;    /* 蜜桃粉 */
  --secondary-cyan: #4ECDC4;  /* 薄荷青 */
  --accent-yellow: #FFD93D;   /* 阳光黄 */
  --accent-purple: #A855F7;   /* 紫色 */
  --dark-black: #1A1A2E;      /* 孟菲斯黑 */

  --border-thick: 3px solid var(--dark-black);
  --border-medium: 2.5px solid var(--dark-black);
  --border-thin: 2px solid var(--dark-black);
  
  /* 孟菲斯特有硬阴影 (无模糊) */
  --shadow-sm: 3px 3px 0px var(--dark-black);
  --shadow-md: 5px 5px 0px var(--dark-black);
  --shadow-lg: 8px 8px 0px var(--dark-black);
  --shadow-btn: 6px 6px 0px var(--dark-black);

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

  --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Source Han Sans CN", "Microsoft YaHei", sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Source Han Sans CN", "Microsoft YaHei", sans-serif;
}

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

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

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  background-image: radial-gradient(rgba(26, 26, 46, 0.06) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ===================================================================
   背景漂浮孟菲斯几何形状 (5-6 个慢速浮动 + 旋转，透明度 0.5)
   =================================================================== */
.memphis-bg-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.m-shape {
  position: absolute;
  opacity: 0.5;
  filter: drop-shadow(4px 4px 0px var(--dark-black));
}

/* 形状 1: 粉色圆 */
.m-circle {
  top: 12%;
  left: 4%;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary-pink);
  border: var(--border-medium);
  animation: floatRotate1 15s ease-in-out infinite alternate;
}

/* 形状 2: 青色三角 */
.m-triangle {
  top: 38%;
  right: 5%;
  width: 56px;
  height: 56px;
  animation: floatRotate2 18s ease-in-out infinite alternate;
}

/* 形状 3: 黄色方块 */
.m-square {
  top: 65%;
  left: 3%;
  width: 44px;
  height: 44px;
  background: var(--accent-yellow);
  border: var(--border-medium);
  animation: floatRotate3 14s ease-in-out infinite alternate;
}

/* 形状 4: 紫色十字 */
.m-cross {
  top: 22%;
  right: 18%;
  width: 42px;
  height: 42px;
  animation: floatRotate1 16s linear infinite;
}

/* 形状 5: 粉色波点矩阵 */
.m-dots {
  bottom: 12%;
  right: 6%;
  width: 80px;
  height: 80px;
  animation: floatRotate2 20s ease-in-out infinite alternate;
}

/* 形状 6: 黄色菱形 / 折线 */
.m-diamond {
  top: 80%;
  left: 20%;
  width: 38px;
  height: 38px;
  background: var(--accent-yellow);
  border: var(--border-medium);
  transform: rotate(45deg);
  animation: floatRotate3 12s ease-in-out infinite alternate;
}

@keyframes floatRotate1 {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(180deg); }
  100% { transform: translateY(15px) rotate(360deg); }
}

@keyframes floatRotate2 {
  0% { transform: translateY(0px) rotate(0deg) scale(1); }
  50% { transform: translateY(-25px) rotate(-140deg) scale(1.1); }
  100% { transform: translateY(20px) rotate(-280deg) scale(0.95); }
}

@keyframes floatRotate3 {
  0% { transform: translateY(0px) rotate(45deg); }
  50% { transform: translateY(-35px) rotate(225deg); }
  100% { transform: translateY(10px) rotate(405deg); }
}

/* 容器与版心 */
.container {
  width: 100%;
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 1;
}

/* ===================================================================
   顶部导航栏 (孟菲斯趣味复古框线)
   =================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: var(--border-thick);
  box-shadow: 0 4px 0px var(--dark-black);
  padding: 14px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--primary-pink);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 3px 3px 0px var(--dark-black);
}

.logo-text {
  color: var(--dark-black);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: all 0.15s ease;
}

.nav-links a:hover {
  background: var(--accent-yellow);
  border-color: var(--dark-black);
  box-shadow: 2px 2px 0px var(--dark-black);
  transform: translate(-1px, -1px);
}

/* ===================================================================
   CTA 按钮规范 (粉色填充 + 3px 黑色描边 + 6px 硬阴影 + hover 偏移)
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 800;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: var(--border-thick);
  text-align: center;
  line-height: 1.2;
  text-decoration: none;
  font-family: var(--font-heading);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-primary {
  background-color: var(--primary-pink);
  color: var(--dark-black);
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translate(2px, 2px);
  box-shadow: 4px 4px 0px var(--dark-black);
}

.btn-primary:active {
  transform: translate(6px, 6px);
  box-shadow: 0px 0px 0px var(--dark-black);
}

.btn-secondary {
  background-color: var(--accent-yellow);
  color: var(--dark-black);
  box-shadow: var(--shadow-btn);
}

.btn-secondary:hover {
  transform: translate(2px, 2px);
  box-shadow: 4px 4px 0px var(--dark-black);
}

.btn-secondary:active {
  transform: translate(6px, 6px);
  box-shadow: 0px 0px 0px var(--dark-black);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
  box-shadow: 4px 4px 0px var(--dark-black);
}

.btn-sm:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px var(--dark-black);
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   主视觉区 (Hero Section) & 大标题布局
   =================================================================== */
.hero {
  padding: 60px 0 50px;
}

.hero-main-row {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 40px;
}

.hero-left {
  text-align: left;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--secondary-cyan);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--dark-black);
  font-weight: 800;
  box-shadow: 3px 3px 0px var(--dark-black);
  margin-bottom: 20px;
}

/* H1「耶耶云」三个字分别用三种颜色（粉/青/黄），Outfit 800 字重 */
.hero-title {
  font-family: var(--font-heading);
  font-size: 3.6rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.title-brand-chars {
  display: inline-flex;
  gap: 4px;
}

.char-ye1 {
  color: var(--primary-pink);
  -webkit-text-stroke: 2.5px var(--dark-black);
  text-shadow: 4px 4px 0px var(--dark-black);
}

.char-ye2 {
  color: var(--secondary-cyan);
  -webkit-text-stroke: 2.5px var(--dark-black);
  text-shadow: 4px 4px 0px var(--dark-black);
}

.char-yun {
  color: var(--accent-yellow);
  -webkit-text-stroke: 2.5px var(--dark-black);
  text-shadow: 4px 4px 0px var(--dark-black);
}

.title-subtext {
  display: block;
  font-size: 1.9rem;
  color: var(--dark-black);
  font-weight: 800;
  margin-top: 6px;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 22px;
  font-weight: 500;
}

/* 主视觉简介区 (Memphis 质感白底黑框硬阴影) */
.hero-intro-box {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-md);
}

.intro-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--dark-black);
  background: var(--accent-yellow);
  border: 1.5px solid var(--dark-black);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 10px;
  box-shadow: 2px 2px 0px var(--dark-black);
}

.hero-intro-text {
  font-size: 0.935rem;
  color: var(--text-main);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ===================================================================
   右侧 3D 旋转多面体 + 轨道动画 (孟菲斯科技感)
   =================================================================== */
.hero-right {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 360px;
}

/* 320px 虚线圆轨道 (黑色 2px) */
.orbit-container {
  position: relative;
  width: 320px;
  height: 320px;
  border: 2px dashed var(--dark-black);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 轨道沿线彩色节点 (粉色方 / 青色圆 / 黄色菱形，以不同速度反向运行) */
.orbit-track-1,
.orbit-track-2,
.orbit-track-3 {
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  pointer-events: none;
}

/* 节点 1：粉色方块 (正向 12s) */
.orbit-track-1 {
  animation: orbitSpinForward 12s linear infinite;
}

.node-pink-square {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 18px;
  background: var(--primary-pink);
  border: 2px solid var(--dark-black);
  box-shadow: 2px 2px 0px var(--dark-black);
}

/* 节点 2：青色圆形 (反向 16s) */
.orbit-track-2 {
  animation: orbitSpinReverse 16s linear infinite;
}

.node-cyan-circle {
  position: absolute;
  bottom: 15%;
  left: 6%;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--secondary-cyan);
  border: 2px solid var(--dark-black);
  box-shadow: 2px 2px 0px var(--dark-black);
}

/* 节点 3：黄色菱形 (反向 10s) */
.orbit-track-3 {
  animation: orbitSpinReverse 10s linear infinite;
}

.node-yellow-diamond {
  position: absolute;
  top: 30%;
  right: 0%;
  width: 18px;
  height: 18px;
  background: var(--accent-yellow);
  border: 2px solid var(--dark-black);
  transform: rotate(45deg);
  box-shadow: 2px 2px 0px var(--dark-black);
}

@keyframes orbitSpinForward {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes orbitSpinReverse {
  from { transform: rotate(360deg); }
  to { transform: rotate(0deg); }
}

/* 240px 线框十二面体多面体 SVG (X+Y 轴 3D 旋转 16s 周期 + 8px 黑色硬阴影) */
.polyhedron-wrapper {
  position: relative;
  width: 240px;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 900px;
}

.polyhedron-svg {
  width: 240px;
  height: 240px;
  filter: drop-shadow(8px 8px 0px var(--dark-black));
  animation: dodecahedron3D 16s linear infinite;
  transform-style: preserve-3d;
}

@keyframes dodecahedron3D {
  0% {
    transform: perspective(800px) rotateX(12deg) rotateY(0deg) rotateZ(0deg);
  }
  25% {
    transform: perspective(800px) rotateX(-15deg) rotateY(90deg) rotateZ(8deg);
  }
  50% {
    transform: perspective(800px) rotateX(18deg) rotateY(180deg) rotateZ(-6deg);
  }
  75% {
    transform: perspective(800px) rotateX(-12deg) rotateY(270deg) rotateZ(10deg);
  }
  100% {
    transform: perspective(800px) rotateX(12deg) rotateY(360deg) rotateZ(0deg);
  }
}

/* 中心叠黑色「耶」字（带白色描边 + 粉色错位阴影） */
.polyhedron-center-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-heading);
  font-size: 54px;
  font-weight: 900;
  color: var(--dark-black);
  -webkit-text-stroke: 2.5px #FFFFFF;
  text-shadow: 4px 4px 0px var(--primary-pink), -2px -2px 0 #FFF, 2px -2px 0 #FFF, -2px 2px 0 #FFF, 2px 2px 0 #FFF;
  pointer-events: none;
  z-index: 5;
  user-select: none;
}

/* ===================================================================
   信任指标栏 (保持原有栅格)
   =================================================================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  box-shadow: var(--shadow-lg);
  margin-top: 10px;
}

.stat-item {
  text-align: center;
  border-right: 2px dashed rgba(26, 26, 46, 0.2);
}

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

.stat-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  color: var(--dark-black);
  display: block;
}

.stat-item:nth-child(1) .stat-value { color: var(--primary-pink); }
.stat-item:nth-child(2) .stat-value { color: var(--secondary-cyan); }
.stat-item:nth-child(3) .stat-value { color: #EAB308; }
.stat-item:nth-child(4) .stat-value { color: var(--accent-purple); }

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 700;
  margin-top: 4px;
}

/* ===================================================================
   通用章节规范
   =================================================================== */
.section {
  padding: 70px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--accent-yellow);
  color: var(--dark-black);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  padding: 4px 14px;
  font-weight: 800;
  margin-bottom: 12px;
  display: inline-block;
  box-shadow: 2px 2px 0px var(--dark-black);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--dark-black);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
  font-weight: 500;
}

/* ===================================================================
   核心优势卡片 (保持原有栅格)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  border: var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  box-shadow: 3px 3px 0px var(--dark-black);
}

.feature-card:nth-child(1) .feature-icon-wrapper {
  background: var(--primary-pink);
  color: var(--dark-black);
}

.feature-card:nth-child(2) .feature-icon-wrapper {
  background: var(--secondary-cyan);
  color: var(--dark-black);
}

.feature-card:nth-child(3) .feature-icon-wrapper {
  background: var(--accent-yellow);
  color: var(--dark-black);
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--dark-black);
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.feature-pill {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  color: var(--dark-black);
  border: 1.5px solid var(--dark-black);
  box-shadow: 2px 2px 0px var(--dark-black);
}

/* ===================================================================
   流媒体与 AI 支持图卡 (保持原有栅格)
   =================================================================== */
.unlock-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.unlock-box {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.unlock-box-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.unlock-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  border: var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 3px 3px 0px var(--dark-black);
}

.icon-ai {
  background: var(--secondary-cyan);
  color: var(--dark-black);
}

.icon-media {
  background: var(--primary-pink);
  color: var(--dark-black);
}

.unlock-title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--dark-black);
}

.unlock-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.unlock-item {
  background: var(--bg-primary);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 2px 2px 0px var(--dark-black);
  transition: transform 0.15s ease;
}

.unlock-item:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px var(--dark-black);
}

.brand-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid var(--dark-black);
  flex-shrink: 0;
}

.dot-green { background: #10B981; }
.dot-purple { background: var(--accent-purple); }
.dot-blue { background: #3B82F6; }
.dot-red { background: #EF4444; }
.dot-orange { background: #F97316; }

.unlock-name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--dark-black);
  display: block;
}

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

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

.pricing-card {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.pricing-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

.pricing-featured {
  background: #FFFDF9;
  border: 3.5px solid var(--dark-black);
  box-shadow: 10px 10px 0px var(--dark-black);
}

.pricing-featured:hover {
  transform: translate(-3px, -3px);
  box-shadow: 12px 12px 0px var(--dark-black);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-pink);
  color: var(--dark-black);
  border: var(--border-thin);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 900;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 3px 3px 0px var(--dark-black);
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 22px;
}

.plan-name {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--dark-black);
}

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

.pricing-price {
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--dark-black);
}

.amount {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--dark-black);
}

.period {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pricing-features li {
  font-size: 0.92rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.check-icon {
  width: 18px;
  height: 18px;
  color: var(--dark-black);
  background: var(--secondary-cyan);
  border: 1.5px solid var(--dark-black);
  border-radius: 50%;
  padding: 2px;
  flex-shrink: 0;
  box-shadow: 1px 1px 0px var(--dark-black);
}

/* ===================================================================
   用户真实评价 (保持原有栅格)
   =================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease;
}

.review-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-lg);
}

.review-stars {
  color: var(--dark-black);
  margin-bottom: 12px;
  font-size: 1.1rem;
  letter-spacing: 2px;
}

.review-content {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1rem;
  color: var(--dark-black);
  box-shadow: 2px 2px 0px var(--dark-black);
}

.review-card:nth-child(1) .reviewer-avatar { background: var(--primary-pink); }
.review-card:nth-child(2) .reviewer-avatar { background: var(--secondary-cyan); }
.review-card:nth-child(3) .reviewer-avatar { background: var(--accent-yellow); }

.reviewer-name {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--dark-black);
}

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

/* ===================================================================
   常见问题解答 FAQ (保持原生 details/summary)
   =================================================================== */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.faq-item[open] {
  background: #FFFDF9;
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 20px 24px;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--dark-black);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-arrow {
  width: 22px;
  height: 22px;
  color: var(--dark-black);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===================================================================
   底部行动召唤 Banner
   =================================================================== */
.cta-banner {
  margin: 40px 0 80px;
  background: var(--secondary-cyan);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  padding: 50px 30px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.cta-banner-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--dark-black);
  margin-bottom: 12px;
}

.cta-banner-desc {
  font-size: 1.05rem;
  color: var(--dark-black);
  max-width: 620px;
  margin: 0 auto 28px;
  font-weight: 600;
}

/* ===================================================================
   页脚：严格只保留 4 个独立页链接
   =================================================================== */
.footer {
  border-top: var(--border-thick);
  background: var(--bg-primary);
  padding: 48px 0 36px;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 800;
  color: var(--dark-black);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: var(--border-thin);
  background: var(--bg-card);
  box-shadow: 3px 3px 0px var(--dark-black);
  transition: all 0.15s ease;
}

.footer-nav a:hover {
  background: var(--accent-yellow);
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--dark-black);
}

.footer-copy {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ===================================================================
   独立内容页通用样式 (about / terms / privacy / sitemap / wiki)
   =================================================================== */
.page-container {
  max-width: 880px;
  margin: 40px auto 80px;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

.page-header {
  border-bottom: var(--border-thick);
  padding-bottom: 20px;
  margin-bottom: 32px;
}

.page-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--dark-black);
  margin-bottom: 8px;
}

.page-meta {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 600;
}

.page-content {
  font-size: 1rem;
  color: var(--text-main);
  line-height: 1.8;
}

.page-content h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--dark-black);
  margin: 36px 0 16px;
  font-weight: 800;
}

.page-content h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--dark-black);
  margin: 24px 0 12px;
  font-weight: 800;
}

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

.page-content ul, .page-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.page-card {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 24px 0;
  box-shadow: var(--shadow-sm);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--dark-black);
  background: var(--accent-yellow);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  margin-bottom: 24px;
  box-shadow: 3px 3px 0px var(--dark-black);
  transition: all 0.15s ease;
}

.back-link:hover {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--dark-black);
}

.sitemap-group {
  margin-bottom: 32px;
}

.sitemap-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.sitemap-item a {
  display: block;
  padding: 14px 18px;
  background: var(--bg-card);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  color: var(--dark-black);
  font-family: var(--font-heading);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

.sitemap-item a:hover {
  background: var(--accent-yellow);
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--dark-black);
}

/* ===================================================================
   响应式适配 (手机端单栏优化)
   =================================================================== */
@media (max-width: 992px) {
  .hero-main-row {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }
  .hero-left {
    text-align: center;
  }
  .hero-title {
    font-size: 2.8rem;
  }
  .hero-actions {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .unlock-wrapper {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 12px 0;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding: 30px 0;
  }
  .hero-title {
    font-size: 2.3rem;
  }
  .title-subtext {
    font-size: 1.4rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  .hero-actions .btn {
    width: 100%;
    min-height: 48px;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px 12px;
  }
  .stat-item {
    border-right: none;
  }
  .stat-value {
    font-size: 1.6rem;
  }
  .unlock-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 14px;
  }
  .footer-nav a {
    display: inline-block;
    width: 200px;
  }
  .orbit-container {
    width: 270px;
    height: 270px;
  }
  .polyhedron-wrapper,
  .polyhedron-svg {
    width: 200px;
    height: 200px;
  }
  .polyhedron-center-text {
    font-size: 44px;
  }
}

/* ===================================================================
   SEO 知识库文章卡片与栅格
   =================================================================== */
.seo-articles-section {
  margin: 40px 0;
}

.seo-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.seo-card {
  background: var(--bg-card);
  border: var(--border-thick);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.seo-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-md);
  background: var(--bg-card-alt);
}

.seo-card-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--dark-black);
  background: var(--accent-yellow);
  border: 1.5px solid var(--dark-black);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  box-shadow: 1.5px 1.5px 0 var(--dark-black);
}

.seo-card:nth-child(2) .seo-card-tag { background: var(--secondary-cyan); }
.seo-card:nth-child(3) .seo-card-tag { background: var(--primary-pink); }
.seo-card:nth-child(4) .seo-card-tag { background: var(--accent-purple); color: #FFF; }
.seo-card:nth-child(5) .seo-card-tag { background: var(--secondary-cyan); }

.seo-card-title {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--dark-black);
  line-height: 1.4;
  margin-bottom: 10px;
}

.seo-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.seo-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--primary-pink);
  margin-top: auto;
  padding-top: 10px;
  border-top: 1.5px dashed rgba(26, 26, 46, 0.15);
}

/* ===================================================================
   响应式与无障碍增强：长文本防撑破、44px触控尺寸与减弱动效
   =================================================================== */

/* 正文、卡片长文本防撑破 */
body, p, h1, h2, h3, h4, .page-content, .feature-card, .pricing-card, .review-card, .article-card {
  overflow-wrap: break-word;
  word-break: break-word;
}

/* 触控区域规范 (至少 44x44px) */
.btn,
.btn-primary,
.btn-secondary,
.btn-sm,
.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* 遵循系统减弱动效偏好 (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;
  }
  .m-shape,
  .polyhedron-wrapper,
  .rot3d-box,
  .orbit-circle,
  .orbit-node {
    animation: none !important;
  }
}