/* ==========================================================================
   最萌云 (CuteCloud) 官方极速落地页样式表
   设计风格：Neo-brutalism + Macaron Palette + Figma Community 玩趣积木风
   ========================================================================== */

:root {
  --color-mint: #A8E6CF;
  --color-peach: #FFD3B6;
  --color-yellow: #FFDF8E;
  --color-sky: #B5D8F0;
  --color-pink: #FFB5C5;
  --color-lavender: #D4B5F5;
  --color-cream: #FAF7F2;
  --color-dark: #1A1A1A;
  --color-white: #FFFFFF;
  --color-gray-light: #F4F0E8;
  --color-text-sub: #4A4A4A;
  
  --border-hard: 2px solid var(--color-dark);
  --border-thick: 3px solid var(--color-dark);
  --shadow-hard: 6px 6px 0 var(--color-dark);
  --shadow-hard-sm: 4px 4px 0 var(--color-dark);
  --shadow-hard-lg: 8px 8px 0 var(--color-dark);
  --shadow-hover: 2px 2px 0 var(--color-dark);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --font-display: "DM Serif Display", "Noto Serif SC", "PingFang SC", "Microsoft YaHei", serif;
  --font-heading: "Space Grotesk", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-cream);
  color: var(--color-dark);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 24秒流体弥散网格动态背景 */
.mesh-bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  background: 
    radial-gradient(circle at 10% 20%, rgba(168, 230, 207, 0.45) 0%, transparent 40%),
    radial-gradient(circle at 90% 15%, rgba(255, 181, 197, 0.45) 0%, transparent 45%),
    radial-gradient(circle at 50% 55%, rgba(255, 223, 142, 0.40) 0%, transparent 40%),
    radial-gradient(circle at 20% 85%, rgba(181, 216, 240, 0.50) 0%, transparent 45%),
    radial-gradient(circle at 80% 80%, rgba(212, 181, 245, 0.45) 0%, transparent 45%);
  filter: blur(45px);
  animation: flowingMesh 24s ease-in-out infinite alternate;
}

@keyframes flowingMesh {
  0% {
    transform: scale(1) translate(0, 0) rotate(0deg);
  }
  33% {
    transform: scale(1.08) translate(30px, -20px) rotate(1deg);
  }
  66% {
    transform: scale(0.96) translate(-25px, 25px) rotate(-1deg);
  }
  100% {
    transform: scale(1.04) translate(15px, -15px) rotate(0.5deg);
  }
}

/* 通用容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部粘性导航栏 */
.sticky-navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 247, 242, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-hard);
  box-shadow: 0 4px 0 rgba(26, 26, 26, 0.08);
  padding: 14px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-dark);
}

.brand-badge {
  background: var(--color-yellow);
  border: var(--border-hard);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 800;
  box-shadow: 2px 2px 0 var(--color-dark);
  transform: rotate(-3deg);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-dark);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

.nav-link:hover {
  background: var(--color-sky);
  border: var(--border-hard);
  box-shadow: 2px 2px 0 var(--color-dark);
  transform: translateY(-2px);
}

.nav-link-news {
  background: var(--color-peach);
  border: var(--border-hard);
  box-shadow: 3px 3px 0 var(--color-dark);
  font-weight: 800;
}

.nav-link-news:hover {
  background: var(--color-pink);
  transform: translateY(-2px) rotate(1deg);
}

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

/* 按钮通用硬核风格 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--color-dark);
  background: var(--color-white);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hard);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  user-select: none;
  white-space: nowrap;
}

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

.btn:active {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 var(--color-dark);
}

.btn-primary {
  background: var(--color-mint);
}

.btn-primary:hover {
  background: #90deb9;
}

.btn-accent {
  background: var(--color-pink);
}

.btn-accent:hover {
  background: #ffa1b5;
}

.btn-secondary {
  background: var(--color-yellow);
}

.btn-lavender {
  background: var(--color-lavender);
}

.btn-sky {
  background: var(--color-sky);
}

.btn-black {
  background: var(--color-dark);
  color: var(--color-cream);
  border-color: var(--color-dark);
  box-shadow: 6px 6px 0 var(--color-yellow);
}

.btn-black:hover {
  color: var(--color-yellow);
  box-shadow: 2px 2px 0 var(--color-yellow);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-hard-sm);
}

.btn-lg {
  padding: 16px 34px;
  font-size: 1.12rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard-lg);
}

/* 涂鸦划线强调背景 */
.scribble-highlight {
  display: inline-block;
  position: relative;
  z-index: 1;
  padding: 2px 10px;
  font-weight: 800;
}

.scribble-highlight::before {
  content: "";
  position: absolute;
  top: 15%;
  left: -4px;
  right: -4px;
  bottom: 8%;
  background: var(--color-pink);
  border: var(--border-hard);
  border-radius: 6px;
  z-index: -1;
  transform: rotate(-1.5deg);
  box-shadow: 3px 3px 0 var(--color-dark);
}

.scribble-highlight.mint::before {
  background: var(--color-mint);
  transform: rotate(1.2deg);
}

.scribble-highlight.yellow::before {
  background: var(--color-yellow);
  transform: rotate(-1deg);
}

/* ================== HERO 主视觉区 ================== */
.hero-section {
  padding: 60px 0 50px;
  position: relative;
}

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

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-yellow);
  border: var(--border-hard);
  box-shadow: var(--shadow-hard-sm);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 800;
  margin-bottom: 22px;
  transform: rotate(-1deg);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  line-height: 1.18;
  font-weight: 900;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 800;
  color: #2b2b2b;
  margin-bottom: 16px;
}

.hero-intro {
  font-size: 1.05rem;
  color: var(--color-text-sub);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 30px;
}

.hero-perks {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.9rem;
  font-weight: 700;
}

.hero-perk-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-white);
  border: var(--border-hard);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  box-shadow: 2px 2px 0 var(--color-dark);
}

/* Hero 右侧多色不规则悬浮积木瓦片群与3D Tilt */
.hero-tiles-board {
  position: relative;
  min-height: 480px;
  perspective: 1000px;
}

.hero-tile {
  position: absolute;
  border: var(--border-thick);
  box-shadow: var(--shadow-hard-lg);
  padding: 24px;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
  transform-style: preserve-3d;
  cursor: pointer;
}

.hero-tile:hover {
  transform: rotateY(12deg) rotateX(-8deg) translateY(-8px) scale(1.02);
  box-shadow: 12px 12px 0 var(--color-dark);
}

.tile-main-square {
  top: 40px;
  left: 20px;
  width: 290px;
  background: var(--color-mint);
  border-radius: var(--radius-lg);
  z-index: 3;
}

.tile-circle {
  top: 0;
  right: 20px;
  width: 170px;
  height: 170px;
  background: var(--color-peach);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  z-index: 4;
}

.tile-blob {
  bottom: 30px;
  right: 10px;
  width: 280px;
  background: var(--color-lavender);
  border-radius: 40px 18px 40px 18px;
  z-index: 2;
}

.tile-floating-pill {
  bottom: 0;
  left: 30px;
  background: var(--color-yellow);
  border-radius: var(--radius-pill);
  padding: 10px 22px;
  z-index: 5;
  box-shadow: var(--shadow-hard);
}

.tile-badge {
  display: inline-block;
  background: var(--color-dark);
  color: var(--color-white);
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 800;
  border-radius: 4px;
  margin-bottom: 10px;
}

.tile-heading {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.tile-desc {
  font-size: 0.9rem;
  color: #2b2b2b;
  font-weight: 600;
}

.tile-stat {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1;
}

.tile-stat-label {
  font-size: 0.75rem;
  font-weight: 800;
}

/* ================== 通用区域标题 ================== */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  background: var(--color-peach);
  border: var(--border-hard);
  box-shadow: var(--shadow-hard-sm);
  padding: 4px 14px;
  font-size: 0.85rem;
  font-weight: 800;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
  transform: rotate(1deg);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-sub);
}

/* ================== 3种场景模式切换 TAB SWITCHER ================== */
.tabs-section {
  padding: 40px 0 60px;
}

.tab-switcher-wrapper {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard-lg);
  padding: 30px;
}

.tab-buttons-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 30px;
  border-bottom: 2px dashed var(--color-dark);
  padding-bottom: 24px;
}

.tab-btn {
  background: var(--color-gray-light);
  border: var(--border-hard);
  box-shadow: var(--shadow-hard-sm);
  padding: 12px 24px;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 800;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--color-dark);
}

.tab-btn.active {
  background: var(--color-pink);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-dark);
}

.tab-content-panel {
  display: none;
  animation: fadeIn 0.3s ease-in;
}

.tab-content-panel.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 40px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-info h3 {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.tab-info p {
  color: var(--color-text-sub);
  margin-bottom: 20px;
  font-size: 1.02rem;
  line-height: 1.7;
}

.tab-checklist {
  list-style: none;
  margin-bottom: 24px;
}

.tab-checklist li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-weight: 700;
}

.tab-checklist li span.icon-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--color-mint);
  border: var(--border-hard);
  border-radius: 50%;
  font-size: 0.8rem;
}

.tab-visual-box {
  background: var(--color-cream);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-hard);
}

.tab-metric-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(26, 26, 26, 0.15);
  font-weight: 700;
}

/* ================== 核心优势 6张马卡龙随机旋转卡片 ================== */
.features-section {
  padding: 60px 0;
}

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

.feature-card {
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-hard);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-8px) rotate(1deg) scale(1.02);
  box-shadow: var(--shadow-hard-lg);
}

.card-mint { background: var(--color-mint); transform: rotate(-1deg); }
.card-peach { background: var(--color-peach); transform: rotate(1deg); }
.card-yellow { background: var(--color-yellow); transform: rotate(-0.5deg); }
.card-sky { background: var(--color-sky); transform: rotate(1.2deg); }
.card-pink { background: var(--color-pink); transform: rotate(-1.2deg); }
.card-lavender { background: var(--color-lavender); transform: rotate(0.8deg); }

.card-icon-bubble {
  width: 60px;
  height: 60px;
  background: var(--color-white);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
  box-shadow: var(--shadow-hard-sm);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.card-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #262626;
  font-weight: 600;
}

/* ================== 流媒体与AI支持卡片 ================== */
.streaming-ai-section {
  padding: 60px 0;
}

.streaming-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.stream-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard-lg);
  padding: 36px 30px;
  position: relative;
  overflow: hidden;
}

.stream-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.stream-logo-pill {
  background: var(--color-sky);
  border: var(--border-hard);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 800;
  box-shadow: 2px 2px 0 var(--color-dark);
}

.stream-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0;
}

.media-tag {
  background: var(--color-cream);
  border: var(--border-hard);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 800;
  box-shadow: 2px 2px 0 var(--color-dark);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.media-tag.highlight {
  background: var(--color-yellow);
}

/* ================== 环形存储与网络容量可视化 ================== */
.storage-ring-section {
  padding: 50px 0 70px;
}

.storage-board {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 320px 1fr;
  align-items: center;
  gap: 40px;
}

.doughnut-wrapper {
  position: relative;
  width: 250px;
  height: 250px;
  margin: 0 auto;
}

.doughnut-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.doughnut-bg {
  fill: none;
  stroke: var(--color-gray-light);
  stroke-width: 28;
}

.doughnut-progress {
  fill: none;
  stroke: var(--color-mint);
  stroke-width: 28;
  stroke-dasharray: 628;
  stroke-dashoffset: 68;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease-in-out;
}

.doughnut-center-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.doughnut-number {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1;
}

.doughnut-label {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-text-sub);
  margin-top: 4px;
}

.storage-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.storage-stat-item {
  background: var(--color-cream);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-hard-sm);
  text-align: center;
}

.storage-stat-num {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 4px;
}

/* ================== 价格套餐对比表 ================== */
.pricing-section {
  padding: 60px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-white);
  border: var(--border-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hard-lg);
}

.pricing-card.popular {
  background: #FFFDF9;
  border-color: var(--color-dark);
  box-shadow: 10px 10px 0 var(--color-dark);
  transform: scale(1.03);
  z-index: 2;
}

.popular-badge {
  position: absolute;
  top: -16px;
  right: 24px;
  background: var(--color-pink);
  border: var(--border-hard);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  font-size: 0.82rem;
  font-weight: 900;
  box-shadow: 2px 2px 0 var(--color-dark);
  transform: rotate(2deg);
}

.pricing-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--color-text-sub);
  margin-bottom: 20px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px dashed var(--color-dark);
}

.pricing-currency {
  font-size: 1.3rem;
  font-weight: 900;
}

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

.pricing-period {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-sub);
}

.pricing-feature-list {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.pricing-feature-list li .check-icon {
  color: #1A1A1A;
  font-weight: 900;
}

/* ================== 用户评价 ================== */
.reviews-section {
  padding: 60px 0;
}

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

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

.review-stars {
  color: #F5A623;
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.review-text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #333333;
  margin-bottom: 20px;
  font-weight: 600;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed var(--color-dark);
  padding-top: 14px;
}

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

.review-name {
  font-size: 0.95rem;
  font-weight: 800;
}

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

/* ================== 常见问题 FAQ ================== */
.faq-section {
  padding: 60px 0 80px;
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background: var(--color-white);
  border: var(--border-hard);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  transition: all 0.2s ease;
}

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

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

.faq-toggle-icon {
  width: 28px;
  height: 28px;
  background: var(--color-yellow);
  border: var(--border-hard);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 900;
  box-shadow: 2px 2px 0 var(--color-dark);
  transition: transform 0.25s ease;
}

.faq-item.open .faq-toggle-icon {
  transform: rotate(45deg);
  background: var(--color-pink);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 24px;
  color: #3b3b3b;
  font-size: 0.95rem;
  line-height: 1.75;
  background: #FCFBF8;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px 24px;
  border-top: 1px dashed var(--color-dark);
}

/* ================== 醒目黑底CTA卡片带彩色斑块装饰 ================== */
.cta-banner-section {
  padding: 30px 0 80px;
}

.cta-black-card {
  background: var(--color-dark);
  color: var(--color-white);
  border: var(--border-thick);
  border-radius: 28px;
  padding: 60px 40px;
  position: relative;
  overflow: hidden;
  box-shadow: 10px 10px 0 var(--color-mint);
  text-align: center;
}

/* 装饰性彩色斑块 (Blobs) */
.cta-blob-1 {
  position: absolute;
  top: -40px;
  left: -40px;
  width: 140px;
  height: 140px;
  background: var(--color-pink);
  border: var(--border-hard);
  border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
  z-index: 1;
  opacity: 0.9;
  transform: rotate(15deg);
}

.cta-blob-2 {
  position: absolute;
  bottom: -40px;
  right: -30px;
  width: 160px;
  height: 160px;
  background: var(--color-yellow);
  border: var(--border-hard);
  border-radius: 40% 60% 70% 30% / 40% 40% 60% 55%;
  z-index: 1;
  opacity: 0.9;
  transform: rotate(-20deg);
}

.cta-blob-3 {
  position: absolute;
  top: 25px;
  right: 15%;
  width: 60px;
  height: 60px;
  background: var(--color-mint);
  border: var(--border-hard);
  border-radius: 50%;
  z-index: 1;
  box-shadow: 3px 3px 0 #000;
}

.cta-card-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 16px;
  color: var(--color-white);
}

.cta-desc {
  font-size: 1.1rem;
  color: #E2E2E2;
  margin-bottom: 32px;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ================== 页脚 (严格只保留4个标题) ================== */
.site-footer {
  background: var(--color-white);
  border-top: var(--border-thick);
  padding: 40px 0 30px;
  position: relative;
}

.footer-nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 2px dashed var(--color-dark);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 900;
}

.footer-links-only-four {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links-only-four li a {
  text-decoration: none;
  color: var(--color-dark);
  font-size: 1.05rem;
  font-weight: 800;
  padding: 6px 14px;
  background: var(--color-gray-light);
  border: var(--border-hard);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-hard-sm);
  transition: all 0.2s ease;
}

.footer-links-only-four li a:hover {
  background: var(--color-yellow);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-dark);
}

.footer-bottom-info {
  margin-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--color-text-sub);
  font-weight: 600;
  flex-wrap: wrap;
  gap: 12px;
}

/* ================== 响应式适配 (Media Queries) ================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 50px;
  }
  
  .hero-tiles-board {
    min-height: 380px;
    max-width: 500px;
    margin: 0 auto;
  }

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

  .pricing-card.popular {
    transform: none;
  }

  .storage-board {
    grid-template-columns: 1fr;
  }

  .streaming-ai-grid {
    grid-template-columns: 1fr;
  }

  .reviews-grid {
    grid-template-columns: 1fr;
    max-width: 540px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 移动端精简模式 */
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .hero-subtitle {
    font-size: 1.15rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-buttons .btn {
    width: 100%;
    min-height: 52px;
    font-size: 1.05rem;
  }

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

  .tab-content-panel.active {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .storage-stats-grid {
    grid-template-columns: 1fr;
  }

  .cta-title {
    font-size: 1.8rem;
  }

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

  .footer-links-only-four {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .footer-links-only-four li a {
    display: block;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-tiles-board {
    display: none; /* 极小手机端隐藏复杂重叠积木以保证最佳触控阅读体验 */
  }

  .cta-black-card {
    padding: 36px 20px;
  }
}