/* ═══════════════════════════════════════════
   星云 WPS Office - 全局样式表
   ═══════════════════════════════════════════ */

/* ── CSS 变量 ── */
:root {
  --space-bg: #0B0D17;
  --space-panel: #14162A;
  --coral: #FF4D2E;
  --coral-hover: #FF6B4F;
  --light-bg: #F6F6F9;
  --card-bg: #FFFFFF;
  --heading-light: #0B0D17;
  --heading-dark: #F0F0F5;
  --body-light: #4A4E69;
  --body-dark: #8C8FAB;
  --glow-white: rgba(240, 240, 245, 0.08);
  --cyan: #00E5CC;
  --purple: #7B6CFF;
  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 16px;
  --radius-pill: 100px;
  --transition: 0.3s ease;
}

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

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

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  color: var(--body-light);
  background: var(--light-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

ul, ol {
  list-style: none;
}

/* ── 关键帧动画 ── */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 229, 204, 0.2); }
  50% { box-shadow: 0 0 40px rgba(0, 229, 204, 0.4); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

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

@keyframes nodePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

/* ── 工具类 ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  text-align: center;
  margin-bottom: 16px;
}

.section-title.light {
  color: var(--heading-light);
}

.section-title.dark {
  color: var(--heading-dark);
}

.section-subtitle {
  font-size: 16px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto 48px;
}

.section-subtitle.light {
  color: var(--body-light);
}

.section-subtitle.dark {
  color: var(--body-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px 40px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: all var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--coral);
  color: #FFFFFF;
  border: none;
}

.btn-primary:hover {
  background: var(--coral-hover);
  box-shadow: 0 8px 24px rgba(255, 77, 46, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--heading-dark);
  border: 1px solid var(--body-dark);
}

.btn-secondary:hover {
  border-color: var(--coral);
  color: var(--coral);
}

.btn-outline {
  background: transparent;
  color: var(--coral);
  border: 2px solid var(--coral);
}

.btn-outline:hover {
  background: var(--coral);
  color: #FFFFFF;
}

.btn-small {
  padding: 10px 24px;
  font-size: 14px;
}

.section-dark {
  background: var(--space-bg);
  color: var(--body-dark);
}

.section-light {
  background: var(--light-bg);
}

.section-white {
  background: var(--card-bg);
}

/* ── 导航栏 ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--transition), backdrop-filter var(--transition);
  display: flex;
  align-items: center;
}

.navbar.scrolled {
  background: rgba(20, 22, 42, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

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

.navbar-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--coral);
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-logo svg {
  width: 28px;
  height: 28px;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.navbar-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--body-dark);
  transition: color var(--transition);
  position: relative;
  padding: 4px 0;
}

.navbar-nav a:hover {
  color: var(--heading-dark);
}

.navbar-nav a.active {
  color: var(--coral);
}

.navbar-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--coral);
  border-radius: 1px;
}

.navbar-actions .btn {
  padding: 10px 28px;
  font-size: 14px;
}

/* 移动端菜单 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--heading-dark);
  transition: all var(--transition);
}

/* ── 英雄区 ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--space-bg);
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  padding: 0 24px;
  margin-left: calc((100vw - var(--max-width)) / 2 + 24px);
}

.hero-title {
  font-size: 64px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--heading-dark);
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.6);
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out both;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--body-dark);
  max-width: 480px;
  margin-bottom: 40px;
  line-height: 1.7;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* ── 平台下载卡片 ── */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(11, 13, 23, 0.06);
  transition: all var(--transition);
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(11, 13, 23, 0.1);
}

.platform-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  color: var(--coral);
}

.platform-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--heading-light);
  margin-bottom: 8px;
}

.platform-desc {
  font-size: 14px;
  color: var(--body-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* ── 核心亮点卡片 ── */
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.highlight-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(11, 13, 23, 0.04);
  transition: all var(--transition);
}

.highlight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--coral), var(--coral-hover));
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(11, 13, 23, 0.08);
}

.highlight-icon {
  width: 44px;
  height: 44px;
  color: var(--coral);
  margin-bottom: 16px;
}

.highlight-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--heading-light);
  margin-bottom: 10px;
}

.highlight-desc {
  font-size: 15px;
  color: var(--body-light);
  line-height: 1.75;
}

/* ── 视频缓冲带 ── */
.video-divider {
  position: relative;
  height: 500px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-divider video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-divider-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(11, 13, 23, 0.45);
  z-index: 1;
}

.video-divider-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
}

.video-divider-title {
  font-size: 48px;
  font-weight: 700;
  color: var(--heading-dark);
  margin-bottom: 32px;
}

/* ── 功能详解 ── */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 80px;
}

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

.feature-block.reverse {
  direction: rtl;
}

.feature-block.reverse > * {
  direction: ltr;
}

.feature-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
}

.feature-text h3 {
  font-size: 32px;
  font-weight: 700;
  color: var(--heading-dark);
  margin-bottom: 16px;
}

.feature-text p {
  font-size: 16px;
  color: var(--body-dark);
  line-height: 1.8;
}

/* ── 用户评价 ── */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  border-left: 3px solid var(--coral);
}

.testimonial-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.testimonial-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--coral);
}

.testimonial-stars {
  display: flex;
  gap: 2px;
  color: #FFB800;
}

.testimonial-stars svg {
  width: 16px;
  height: 16px;
}

.testimonial-text {
  font-size: 14px;
  color: var(--body-dark);
  line-height: 1.7;
}

/* ── 数据统计区 ── */
.stats-section {
  position: relative;
  overflow: hidden;
}

#stats-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.stats-content {
  position: relative;
  z-index: 2;
}

.stats-center {
  text-align: center;
  margin-bottom: 60px;
}

.stats-number {
  font-size: 64px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
  animation: pulseGlow 3s ease-in-out infinite;
}

.stats-label {
  font-size: 18px;
  color: var(--body-dark);
  margin-top: 8px;
}

/* 环形轨道 */
.orbit-container {
  position: relative;
  width: 600px;
  height: 600px;
  margin: 0 auto;
}

.orbit-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.orbit-ring {
  fill: none;
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 1;
  stroke-dasharray: 4 8;
}

.data-node {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 12px rgba(255, 77, 46, 0.5);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: nodePulse 2s ease-in-out infinite;
}

.data-node:hover {
  transform: scale(1.8);
  z-index: 10;
}

.data-node-tooltip {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  background: var(--space-panel);
  color: var(--heading-dark);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.data-node:hover .data-node-tooltip {
  opacity: 1;
}

.stats-grid-fallback {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-item {
  text-align: center;
  padding: 24px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.stat-item:hover {
  background: rgba(255, 255, 255, 0.06);
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-desc {
  font-size: 14px;
  color: var(--body-dark);
}

/* ── FAQ 手风琴 ── */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(11, 13, 23, 0.1);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 24px 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--heading-light);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition);
}

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

.faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--coral);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: 24px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--body-light);
  line-height: 1.8;
}

/* ── 页脚 ── */
.footer {
  background: var(--space-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 60px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-column h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--heading-dark);
  margin-bottom: 20px;
}

.footer-column a {
  display: block;
  font-size: 14px;
  color: var(--body-dark);
  margin-bottom: 12px;
  transition: color var(--transition);
}

.footer-column a:hover {
  color: var(--coral);
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-bottom p {
  font-size: 13px;
  color: var(--body-dark);
  margin-bottom: 8px;
}

.footer-bottom .footer-disclaimer {
  font-size: 12px;
  color: rgba(140, 143, 171, 0.6);
  margin-top: 16px;
}

/* ═══════════════════════════════════════════
   下载页专用样式
   ═══════════════════════════════════════════ */

.download-hero {
  background: linear-gradient(135deg, var(--space-bg) 0%, var(--space-panel) 100%);
  padding: 140px 0 80px;
  text-align: center;
}

.download-hero h1 {
  font-size: 48px;
  font-weight: 700;
  color: var(--heading-dark);
  margin-bottom: 16px;
}

.download-hero p {
  font-size: 18px;
  color: var(--body-dark);
  margin-bottom: 32px;
}

.windows-highlight {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 48px;
  max-width: 700px;
  margin: 0 auto 48px;
  backdrop-filter: blur(10px);
}

.windows-highlight .version-info {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 16px;
  font-size: 14px;
  color: var(--body-dark);
}

.platform-download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.download-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  box-shadow: 0 4px 24px rgba(11, 13, 23, 0.06);
  transition: all var(--transition);
}

.download-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(11, 13, 23, 0.1);
}

.download-card-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--coral);
}

.download-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--heading-light);
  margin-bottom: 8px;
}

.download-card .version-tag {
  display: inline-block;
  background: var(--light-bg);
  color: var(--body-light);
  font-size: 13px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 8px;
}

.download-card .sys-req {
  font-size: 13px;
  color: var(--body-light);
  margin-bottom: 16px;
}

.install-steps {
  max-width: 800px;
  margin: 0 auto;
}

.step-item {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  align-items: flex-start;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--coral);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading-light);
  margin-bottom: 6px;
}

.step-content p {
  font-size: 15px;
  color: var(--body-light);
  line-height: 1.7;
}

.sys-req-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sys-req-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 4px 24px rgba(11, 13, 23, 0.04);
}

.sys-req-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--heading-light);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sys-req-card h4 svg {
  width: 20px;
  height: 20px;
  color: var(--coral);
}

.sys-req-card ul li {
  font-size: 14px;
  color: var(--body-light);
  padding: 6px 0;
  border-bottom: 1px solid rgba(11, 13, 23, 0.06);
}

.sys-req-card ul li:last-child {
  border-bottom: none;
}

.changelog-list {
  max-width: 800px;
  margin: 0 auto;
}

.changelog-item {
  display: flex;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(11, 13, 23, 0.08);
}

.changelog-version {
  flex-shrink: 0;
  width: 100px;
}

.changelog-version .ver-tag {
  font-size: 18px;
  font-weight: 700;
  color: var(--coral);
}

.changelog-version .ver-date {
  font-size: 13px;
  color: var(--body-light);
  margin-top: 4px;
}

.changelog-content ul {
  list-style: disc;
  padding-left: 20px;
}

.changelog-content ul li {
  font-size: 15px;
  color: var(--body-light);
  padding: 4px 0;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════
   SEO 引导页专用样式
   ═══════════════════════════════════════════ */

.seo-hero {
  background: linear-gradient(135deg, var(--space-bg) 0%, #1a1d38 100%);
  padding: 140px 0 80px;
  text-align: center;
}

.seo-hero h1 {
  font-size: 42px;
  font-weight: 700;
  color: var(--heading-dark);
  margin-bottom: 16px;
}

.seo-hero .subtitle {
  font-size: 18px;
  color: var(--body-dark);
  max-width: 600px;
  margin: 0 auto 32px;
}

.seo-content h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--heading-light);
  margin-bottom: 20px;
}

.seo-content h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--heading-light);
  margin: 32px 0 12px;
}

.seo-content p {
  font-size: 16px;
  color: var(--body-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

.seo-content strong {
  color: var(--coral);
  font-weight: 600;
}

.seo-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.seo-content ul li {
  font-size: 16px;
  color: var(--body-light);
  line-height: 1.8;
  margin-bottom: 8px;
}

.seo-cta-box {
  background: linear-gradient(135deg, var(--space-panel) 0%, var(--space-bg) 100%);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  margin: 48px 0;
  border: 1px solid rgba(255, 77, 46, 0.2);
}

.seo-cta-box h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--heading-dark);
  margin-bottom: 12px;
}

.seo-cta-box p {
  font-size: 16px;
  color: var(--body-dark);
  margin-bottom: 24px;
}

.keyword-tag {
  display: inline-block;
  background: rgba(255, 77, 46, 0.1);
  color: var(--coral);
  font-size: 13px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin: 2px;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.comparison-table th,
.comparison-table td {
  padding: 16px;
  text-align: left;
  border-bottom: 1px solid rgba(11, 13, 23, 0.08);
}

.comparison-table th {
  background: var(--light-bg);
  font-weight: 600;
  color: var(--heading-light);
  font-size: 15px;
}

.comparison-table td {
  font-size: 15px;
  color: var(--body-light);
}

.comparison-table tr:hover td {
  background: rgba(255, 77, 46, 0.02);
}

.comparison-table .check {
  color: #22C55E;
}

.comparison-table .cross {
  color: #EF4444;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.tip-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 4px 24px rgba(11, 13, 23, 0.04);
}

.tip-card h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--heading-light);
  margin-bottom: 8px;
}

.tip-card p {
  font-size: 14px;
  color: var(--body-light);
  line-height: 1.7;
}

/* ═══════════════════════════════════════════
   响应式适配
   ═══════════════════════════════════════════ */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 48px;
  }

  .hero-content {
    margin-left: 24px;
  }

  .feature-block {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .navbar-nav {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--space-panel);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
  }

  .navbar-nav.open {
    display: flex;
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-actions {
    display: none;
  }

  .hero {
    min-height: 80vh;
    align-items: center;
    justify-content: center;
  }

  .hero-content {
    margin-left: 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-actions {
    justify-content: center;
  }

  .section-title {
    font-size: 28px;
  }

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

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

  .feature-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .feature-block.reverse {
    direction: ltr;
  }

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

  .video-divider {
    height: 350px;
  }

  .video-divider-title {
    font-size: 28px;
  }

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

  .orbit-container {
    width: 300px;
    height: 300px;
  }

  .stats-number {
    font-size: 36px;
  }

  .platform-download-grid {
    grid-template-columns: 1fr;
  }

  .sys-req-grid {
    grid-template-columns: 1fr;
  }

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

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

  .comparison-table {
    font-size: 14px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 10px;
  }

  .seo-hero h1 {
    font-size: 30px;
  }

  .download-hero h1 {
    font-size: 32px;
  }

  .changelog-item {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .btn {
    padding: 14px 28px;
    font-size: 14px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ── 减少动画 ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ── 安全区域 ── */
.section-padded {
  padding: 120px 0;
}

@media (max-width: 768px) {
  .section-padded {
    padding: 60px 0;
  }
}