/* 全局高级设计系统 CSS */

:root {
  --background: #050506;
  --white: #f5f5f7;
  --muted: rgba(245, 245, 247, 0.68);
  --dim: rgba(245, 245, 247, 0.42);
  --line: rgba(255, 255, 255, 0.08);
  --line-bright: rgba(255, 255, 255, 0.16);
  --glass: rgba(255, 255, 255, 0.026);
  --glass-active: rgba(255, 255, 255, 0.08);
  --accent-pink: rgba(255, 45, 116, 0.22);
  --accent-purple: rgba(125, 82, 255, 0.16);
  --nav-height: 72px;

  /* 动效曲线系统 */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
}

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

html, body {
  width: 100%;
  min-height: 100%;
  background: var(--background);
  color: var(--white);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

/* 极细半透明网格背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -10;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.012) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.012) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 50%, black 30%, transparent 85%);
  pointer-events: none;
}

/* 高级导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(5, 5, 6, 0.5);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
  transition: background 0.4s var(--ease-out-quart), backdrop-filter 0.4s, border-color 0.4s;
}

/* Layer 6：导航栏滚动状态 */
.navbar.scrolled {
  background: rgba(5, 5, 6, 0.82);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border-bottom-color: rgba(255, 255, 255, 0.12);
}

.nav-container {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--white);
}

.logo-img {
  width: 32px;
  height: 32px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line-bright);
}

.brand-name {
  font-family: 'Outfit', sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s;
}

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

.nav-links .nav-btn {
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--line-bright);
  border-radius: 999px;
  color: var(--white);
  font-weight: 600;
  transition: background 0.3s, transform 0.2s;
}

.nav-links .nav-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  transform: translateY(-1px);
}

/* 极简高档中英文切换器 */
.lang-switcher {
  display: flex;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 99px;
  padding: 2px;
  position: relative;
  cursor: pointer;
  user-select: none;
  align-items: center;
}

.lang-btn {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  color: var(--dim);
  border: none;
  background: transparent;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  font-family: 'Outfit', sans-serif;
}

.lang-btn:hover {
  color: var(--white);
}

.lang-btn.active {
  color: #000 !important;
  background: var(--white);
  box-shadow: 0 2px 6px rgba(255, 255, 255, 0.15);
}

/* 移动端菜单切换按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 16px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 110;
}

.menu-toggle span {
  width: 100%;
  height: 2px;
  background: var(--white);
  transition: all 0.3s;
  border-radius: 2px;
}

/* 移动端抽屉菜单 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 75%;
  height: 100vh;
  background: rgba(5, 5, 6, 0.95);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-left: 1px solid var(--line);
  z-index: 95;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  transition: right 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu a {
  text-decoration: none;
  color: var(--muted);
  font-size: 20px;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
  transition: color 0.3s;
}

.mobile-menu a:hover {
  color: var(--white);
}

body.no-scroll {
  overflow: hidden;
}

/* 导航栏激活状态动画 */
.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + 40px);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  z-index: 2;
}

.badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 24px;
  /* Layer 1：Hero 入场编排 */
  animation: heroFadeUp 700ms var(--ease-out-expo) both;
  animation-delay: 0ms;
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-size: 92px;
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -0.04em;
  margin-bottom: 28px;
  background: linear-gradient(180deg, var(--white) 0%, rgba(245, 245, 247, 0.6) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  animation: heroFadeUp 700ms var(--ease-out-expo) both;
  animation-delay: 100ms;
}

.hero-subtitle {
  font-size: 22px;
  line-height: 1.55;
  color: var(--muted);
  max-width: 600px;
  margin-bottom: 44px;
  font-weight: 400;
  animation: heroFadeUp 700ms var(--ease-out-expo) both;
  animation-delay: 200ms;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  animation: heroFadeUp 700ms var(--ease-out-expo) both;
  animation-delay: 300ms;
}

.btn {
  display: inline-block;
  padding: 16px 36px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 999px;
  transition: all 0.3s;
  cursor: pointer;
}

.btn-primary {
  background: var(--white);
  color: #000;
}

.btn-primary:hover {
  background: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line-bright);
  color: var(--white);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
}

.glow-sphere {
  position: absolute;
  width: 450px;
  height: 450px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-pink), var(--accent-purple) 45%, transparent 70%);
  filter: blur(40px);
  z-index: 1;
  /* Layer 1 入场 + Layer 3 呼吸脉动 */
  animation: heroScaleIn 900ms var(--ease-out-expo) 600ms both, glowPulse 6s ease-in-out 1.5s infinite;
}

.preview-card-wrapper {
  position: relative;
  z-index: 2;
  width: 235px;
  height: 480px;
}

.hero-static-card {
  position: relative;
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 25px 55px rgba(0, 0, 0, 0.65));
  /* Layer 1 入场 + Layer 4 微浮动 */
  animation: heroScaleIn 800ms var(--ease-out-expo) 400ms both, gentleFloat 5s ease-in-out 1.2s infinite;
}

.hero-static-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: transparent;
  display: block;
}


/* 概念核心介绍 */
.concept-brief {
  padding: 100px 0;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.01);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.concept-item {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 40px 32px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
  transition: border-color 0.3s, transform 0.3s;
}

.concept-item:hover {
  border-color: var(--line-bright);
  transform: translateY(-4px);
}

.concept-icon {
  font-size: 24px;
  color: var(--dim);
  margin-bottom: 20px;
}

.concept-item h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.concept-item p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* 3D 翻转交互演示区 */
.interactive-section {
  padding: 120px 0;
  border-top: 1px solid var(--line);
}

.interactive-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 64px;
}

.section-eyebrow {
  display: inline-block;
  color: var(--dim);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.5;
}

.interactive-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.interactive-controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-btn {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  text-align: left;
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--line);
  border-left: 3px solid transparent;
  padding: 24px;
  border-radius: 20px;
  color: inherit;
  cursor: pointer;
  transition: all 0.4s var(--ease-out-quart);
}

.step-btn:hover {
  border-color: var(--line-bright);
  border-left-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
}

/* Layer 6：Step 按钮高亮条 */
.step-btn.active {
  border-color: rgba(255, 255, 255, 0.3);
  border-left-color: var(--white);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.step-num {
  font-family: 'Outfit', sans-serif;
  font-size: 24px;
  font-weight: 800;
  color: var(--dim);
  line-height: 1;
}

.step-btn.active .step-num {
  color: var(--white);
}

.step-text strong {
  display: block;
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-text small {
  display: block;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}

/* 3D 物理卡片视口 */
.interactive-viewport {
  position: relative;
  width: 100%;
  height: 580px;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.02), transparent);
  overflow: hidden;
}

.view-glow {
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(125, 82, 255, 0.12), transparent 60%);
  z-index: 1;
  transition: background 0.8s;
  pointer-events: none;
  /* Layer 3：交互区光球呼吸脉动 */
  animation: glowPulse 6s ease-in-out infinite;
}

.device-3d-scene {
  perspective: 1200px;
  z-index: 2;
}

.device-3d-card {
  position: relative;
  width: 264px;
  height: 480px;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.25, 1, 0.5, 1), filter 0.8s, box-shadow 0.8s;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.6));
}

.card-face {
  position: absolute;
  inset: 0;
  transition: opacity 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}

.card-face img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: transparent;
  display: block;
}

.face-front {
  background: transparent;
  z-index: 2;
  transform: rotateY(0deg);
}

.face-back {
  background: transparent;
  transform: rotateY(180deg);
}

.face-label {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 4px 10px;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  border-radius: 99px;
  border: 1px solid var(--line);
}

/* UI 画廊 Section */
.ui-preview-section {
  padding: 120px 0;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.005);
}

.ui-gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-top: 20px;
}

.ui-tile {
  display: flex;
  flex-direction: column;
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.tile-frame {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 44px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.01));
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  transition: transform 0.4s, border-color 0.4s, box-shadow 0.4s;
}

.tile-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.tile-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  padding: 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
}

.tile-label span {
  color: var(--dim);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* UI Tile Hover 效果 */
.ui-tile:hover {
  transform: translateY(-8px);
}

.ui-tile:hover .tile-frame {
  border-color: var(--line-bright);
  box-shadow: 
    0 24px 50px rgba(0, 0, 0, 0.5),
    0 0 20px rgba(255, 255, 255, 0.02);
}

.ui-tile:hover .tile-frame img {
  transform: scale(1.12);
}

/* 高档页脚 */
.footer {
  border-top: 1px solid var(--line);
  padding: 64px 0;
  background: #020203;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: 'Outfit', sans-serif;
  font-size: 18px;
  font-weight: 700;
}

.footer-logo {
  width: 24px;
  height: 24px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--line);
}

.footer-copyright {
  font-size: 13px;
  color: var(--dim);
}

.footer-links {
  display: flex;
  gap: 32px;
  margin-top: 8px;
}

.footer-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--white);
}

/* FAQ 详情框与联系表单 (用于技术支持页) */
.faq-section {
  padding: 120px 0;
  min-height: calc(100vh - var(--nav-height) - 180px);
}

.faq-container {
  max-width: 720px;
  margin: 0 auto;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 40px;
}

details {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.01);
  padding: 20px;
  transition: all 0.3s;
}

details[open] {
  border-color: var(--line-bright);
  background: rgba(255, 255, 255, 0.03);
}

summary {
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  outline: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--dim);
  transition: transform 0.3s;
}

details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-content {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.contact-section {
  padding: 100px 0;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.005);
}

.contact-container {
  max-width: 580px;
  margin: 0 auto;
}

.contact-form {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 40px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
  margin-top: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
  color: var(--white);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: all 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.03);
}

.submit-btn {
  width: 100%;
  border: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 16px;
}

/* 提示弹窗 (Toast) */
.toast {
  position: fixed;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--line-bright);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--white);
  padding: 16px 32px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
  z-index: 200;
  transition: bottom 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}

.toast.show {
  bottom: 40px;
}

/* 简约合规页面样式 (Privacy & Terms) */
.doc-section {
  padding: 120px 0;
  min-height: calc(100vh - var(--nav-height) - 180px);
}

.doc-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

.doc-container h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 12px;
}

.doc-meta {
  font-size: 13px;
  color: var(--dim);
  margin-bottom: 40px;
}

.doc-content h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 16px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}

.doc-content p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  margin-bottom: 16px;
}

.doc-content ul {
  padding-left: 20px;
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

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

/* 响应式媒体查询 */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 72px;
  }
  .interactive-grid {
    gap: 40px;
  }
  .ui-gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  /* 移动端导航 */
  .nav-links {
    display: none;
  }
  .menu-toggle {
    display: flex;
  }
  
  /* Hero */
  .hero {
    padding-top: calc(var(--nav-height) + 20px);
    text-align: center;
  }
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-title {
    font-size: 52px;
  }
  .hero-subtitle {
    font-size: 18px;
    margin: 0 auto 32px;
  }
  .hero-ctas {
    justify-content: center;
  }
  .hero-visual {
    order: -1;
  }
  .glow-sphere {
    width: 300px;
    height: 300px;
  }
  
  /* Concept */
  .concept-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  /* Interactive */
  .interactive-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .interactive-viewport {
    height: 480px;
  }
  .device-3d-card {
    width: 220px;
    height: 345px;
  }
  
  /* UI Gallery */
  .ui-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  /* Docs */
  .doc-container h1 {
    font-size: 32px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 36px;
  }
  .ui-gallery-grid {
    grid-template-columns: 1fr;
  }
  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
}

/* ==========================================
   新增扩展板块样式 (Scenarios, Specs, FAQ)
   ========================================== */

/* 日常故事板块 */
.story-section {
  padding: 160px 0;
  border-top: 1px solid var(--line);
}

.story-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 40px;
}

.story-content {
  max-width: 440px;
}

.story-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 20px;
  display: block;
}

.story-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--white);
  font-family: 'Outfit', sans-serif;
  line-height: 1.2;
}

.story-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  font-weight: 300;
}

.story-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.story-visual .visual-wrapper {
  border: 1px solid var(--line);
  border-radius: 44px;
  overflow: hidden;
  background: #060608;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6);
  max-width: 340px;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.6s var(--ease-out-expo), border-color 0.3s, box-shadow 0.3s;
}

.story-visual .visual-wrapper img {
  width: 100%;
  display: block;
  transform: scale(1.06);
  transition: transform 0.6s var(--ease-out-expo);
}

.story-visual .visual-wrapper:hover {
  border-color: var(--line-bright);
}

.story-visual .visual-wrapper:hover img {
  transform: scale(1.12);
}

/* 主题展示模块：无背景平铺图标拼贴墙 */
.theme-icons-mosaic {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  width: 100%;
  max-width: 420px;
  padding: 10px;
  align-items: center;
  justify-items: center;
}

.theme-icons-mosaic img {
  width: 52px;
  height: 52px;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  border-radius: 14px;
  cursor: pointer;
  filter: drop-shadow(0 8px 12px rgba(0, 0, 0, 0.5));
  opacity: 1;
}

/* 滚动 Stagger 初始前置状态 */
.story-section.js-reveal .theme-icons-mosaic img {
  opacity: 0;
  transform: scale(0.7) translateY(12px);
  transition: transform 0.9s var(--ease-out-expo), opacity 0.9s var(--ease-out-expo), filter 0.3s;
}

/* 激活后按照 transitionDelay 顺序优雅滑入 */
.story-section.active .theme-icons-mosaic img {
  opacity: 1;
  transform: scale(1) translateY(0);
}

.theme-icons-mosaic img:hover {
  transform: scale(1.18) translateY(-6px) !important;
  filter: drop-shadow(0 16px 24px rgba(0, 0, 0, 0.8)) brightness(1.1);
  z-index: 2;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), filter 0.3s;
}

/* 相机滤镜面板 */
.filter-panel-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 400px;
}

.filter-glass-deck {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  width: 100%;
}

.filter-glass-item {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 20px;
  background: rgba(255, 255, 255, 0.02);
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.filter-glass-item::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 0;
  opacity: 0.06;
  transform-origin: top left;
  transition: opacity 0.5s var(--ease-out-expo), transform 0.5s var(--ease-out-expo);
}

.filter-glass-item.kodak::before {
  background: radial-gradient(circle at top left, #ffc837, #ff8008);
}

.filter-glass-item.chrome::before {
  background: radial-gradient(circle at top left, #a1c4fd, #c2e9fb);
}

.filter-glass-item.hk::before {
  background: radial-gradient(circle at top left, #00f2fe, #4facfe);
}

.filter-glass-item.pop::before {
  background: radial-gradient(circle at top left, #ff0844, #ffb199);
}

.filter-glass-item:hover {
  border-color: var(--line-bright);
  transform: translateY(-4px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.6);
}

.filter-glass-item:hover::before {
  opacity: 0.22;
  animation: filterGlowMove 7s infinite ease-in-out;
}

@keyframes filterGlowMove {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-10%, -8%) scale(1.22);
  }
  100% {
    transform: translate(0, 0) scale(1);
  }
}

.filter-badge {
  display: inline-block;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.1em;
  padding: 3px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--white);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.filter-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--white);
  font-family: 'Outfit', sans-serif;
  position: relative;
  z-index: 1;
  letter-spacing: 0.05em;
}

/* 交错排序 */
@media (min-width: 769px) {
  .story-section.img-left .story-content {
    order: 2;
  }
  .story-section.img-left .story-visual {
    order: 1;
  }
}

/* 技术规格板块 */
.specs-section {
  padding: 120px 0;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.005);
}

.specs-header {
  text-align: center;
  margin-bottom: 64px;
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 80px;
  max-width: 1000px;
  margin: 0 auto;
}

.spec-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.spec-item:last-child {
  border-bottom: 1px solid var(--line);
}

.spec-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--dim);
}

.spec-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
  text-align: right;
  font-family: 'Outfit', sans-serif;
}

/* FAQ 板块 */
.faq-section {
  padding: 120px 0;
  border-top: 1px solid var(--line);
}

.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-trigger {
  background: transparent;
  border: none;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--white);
  cursor: pointer;
  text-align: left;
  transition: color 0.3s;
  font-family: 'Outfit', sans-serif;
}

.faq-trigger:hover {
  color: rgba(255, 255, 255, 0.85);
}

.faq-icon {
  font-size: 20px;
  font-weight: 400;
  color: var(--dim);
  transition: transform 0.4s var(--ease-out-quart), color 0.3s;
  margin-left: 20px;
  display: inline-block;
}

/* Layer 6：FAQ 图标旋转过渡 */
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-item.active .faq-icon {
  color: var(--white);
}

.faq-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.faq-panel-content {
  padding-bottom: 28px;
}

.faq-panel-content p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--muted);
}

/* ==========================================
   新增板块响应式媒体查询适配
   ========================================== */
@media (max-width: 768px) {
  /* Focus Stories */
  .story-section {
    padding: 100px 0;
  }
  .story-container {
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
  }
  .story-content {
    max-width: 100%;
  }
  .theme-icons-mosaic {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    max-width: 280px;
    margin: 0 auto;
    align-items: center;
    justify-items: center;
  }
  .theme-icons-mosaic img {
    width: 48px;
    height: 48px;
  }
  .filter-glass-deck {
    gap: 16px;
  }
  
  /* Specs */
  .specs-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .spec-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 20px 0;
  }
  .spec-value {
    text-align: left;
  }
}

/* 3D 打印下载按钮极客样式 */
.specs-cta {
  margin-top: 48px;
  text-align: center;
}

.spec-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 36px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line-bright);
  border-radius: 999px;
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.spec-download-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(255, 255, 255, 0.05);
}

.btn-arrow {
  transition: transform 0.3s;
}

.spec-download-btn:hover .btn-arrow {
  transform: translateX(4px);
}

/* ==========================================
   首页故事前言板块 (Prologue Sections)
   ========================================== */
.prologue-section {
  padding: 120px 0;
  text-align: left;
}
.prologue-eyebrow {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 24px;
  display: block;
}
.prologue-title {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--white);
  margin-bottom: 28px;
}
.prologue-text {
  font-size: 22px;
  line-height: 1.68;
  color: var(--muted);
  font-weight: 400;
  max-width: 760px;
}

@media (max-width: 768px) {
  .prologue-section {
    padding: 80px 0;
  }
  .prologue-title {
    font-size: 36px;
  }
  .prologue-text {
    font-size: 18px;
  }
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

/* ==========================================
   滚动 Reveal 过渡动画
   ========================================== */
.reveal-on-scroll {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 1.2s var(--ease-out-expo), transform 1.2s var(--ease-out-expo);
  will-change: transform, opacity;
}

/* 只有当 JS 确认支持动效并初始化时，才动态添加该类进行初始隐藏 */
.reveal-on-scroll.js-reveal {
  opacity: 0;
  transform: translateY(40px);
}

.reveal-on-scroll.js-reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Layer 2：子元素交错淡入 */
.reveal-on-scroll.js-reveal .stagger-child {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.reveal-on-scroll.js-reveal.active .stagger-child {
  opacity: 1;
  transform: translateY(0);
}

.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(1) { transition-delay: 0ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(2) { transition-delay: 100ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(3) { transition-delay: 200ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(4) { transition-delay: 300ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(5) { transition-delay: 400ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(6) { transition-delay: 500ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(7) { transition-delay: 600ms; }
.reveal-on-scroll.js-reveal.active .stagger-child:nth-child(8) { transition-delay: 700ms; }

/* ==========================================
   @keyframes 动画关键帧
   ========================================== */

/* Layer 1：Hero 入场 — 淡入 + 上移 */
@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Layer 1：Hero 入场 — 缩放浮现 */
@keyframes heroScaleIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Layer 3：Glow 呼吸脉动 */
@keyframes glowPulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.08);
  }
}

/* Layer 4：Hero 卡片微浮动 */
@keyframes gentleFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

/* Layer 5：探索箭头呼吸引导 */
@keyframes arrowBounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(4px);
  }
}

.explore-arrow {
  display: inline-block;
  font-size: 16px;
  animation: arrowBounce 2s ease-in-out infinite;
}

/* ==========================================
   无障碍：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;
  }
}