/* ========================================
   OpenBoard 官方推广网站 - 主样式表
   版本: 1.0.0
   配色: 橙色主调 + 深灰文字 + 浅灰背景
   ======================================== */

/* ===== CSS 变量 ===== */
:root {
  /* 主色 */
  --color-primary: #F58220;
  --color-primary-hover: #FFA94D;
  --color-primary-active: #E6741C;
  --color-primary-light: #FFF4E5;
  --color-primary-lighter: #FFF8EE;

  /* 文字色 */
  --color-text: #4A4A4A;
  --color-text-dark: #2C2C2C;
  --color-text-light: #7A7A7A;
  --color-text-muted: #9B9B9B;

  /* 背景色 */
  --color-bg: #FFFFFF;
  --color-bg-soft: #F7F8FA;
  --color-bg-card: #FAFBFC;
  --color-bg-section: #FAFBFC;

  /* 边框 */
  --color-border: #E5E5E5;
  --color-border-light: #F0F1F4;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(74, 74, 74, 0.06);
  --shadow-md: 0 4px 16px rgba(74, 74, 74, 0.08);
  --shadow-lg: 0 8px 32px rgba(74, 74, 74, 0.12);
  --shadow-xl: 0 16px 48px rgba(74, 74, 74, 0.16);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Noto Sans SC", "Helvetica Neue", "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, "Courier New", monospace;

  /* 过渡 */
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* 容器宽度 */
  --container-max: 1200px;
}

/* ===== 全局重置 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-primary-hover);
}

ul, ol {
  list-style: none;
}

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

/* ===== 容器 ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 标题 ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-dark);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p { margin-bottom: 1rem; }

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(245, 130, 32, 0.3);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 130, 32, 0.4);
}

.btn-primary:active {
  background-color: var(--color-primary-active);
  transform: translateY(0);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-dark);
  border-color: var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-dark);
}

.btn-ghost:hover {
  color: var(--color-primary);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1.0625rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* ===== 导航栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-dark);
}

.brand:hover {
  color: var(--color-text-dark);
}

.brand-logo {
  width: 36px;
  height: 36px;
}

.brand-name {
  letter-spacing: -0.02em;
}

.brand-name .accent {
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.25s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-dark);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.nav-toggle:hover {
  background-color: var(--color-bg-soft);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-dark);
  position: relative;
  transition: var(--transition);
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background-color: var(--color-text-dark);
  transition: var(--transition);
}

.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

.nav-toggle.open span {
  background-color: transparent;
}

.nav-toggle.open span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle.open span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ===== Hero 区 ===== */
.hero {
  position: relative;
  padding: 5rem 0 4rem;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 20%, rgba(245, 130, 32, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(245, 130, 32, 0.06) 0%, transparent 50%),
    linear-gradient(180deg, #FFF8EE 0%, #FFFFFF 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-content {
  max-width: 540px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary-active);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  color: var(--color-primary);
  position: relative;
  display: inline-block;
}

.hero-title .highlight::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 8px;
  background-color: rgba(245, 130, 32, 0.25);
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-light);
}

.hero-stat-num {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--color-text-dark);
  line-height: 1;
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.375rem;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual img {
  width: 100%;
  max-width: 640px;
  filter: drop-shadow(0 20px 40px rgba(74, 74, 74, 0.15));
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* ===== Section 通用 ===== */
.section {
  padding: 5rem 0;
}

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

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.875rem;
}

.section-title {
  font-size: clamp(1.875rem, 3.5vw, 2.5rem);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== 场景卡片 ===== */
.scenes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.scene-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.scene-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.scene-img {
  aspect-ratio: 3 / 2;
  background-color: var(--color-bg-soft);
  overflow: hidden;
}

.scene-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.scene-card:hover .scene-img img {
  transform: scale(1.03);
}

.scene-body {
  padding: 1.75rem;
}

.scene-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary-active);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.scene-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.625rem;
  color: var(--color-text-dark);
}

.scene-desc {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 功能卡片网格 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  padding: 2rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.feature-title {
  font-size: 1.1875rem;
  font-weight: 700;
  margin-bottom: 0.625rem;
  color: var(--color-text-dark);
}

.feature-desc {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 用户评价 ===== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  padding: 2rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.testimonial-quote-icon {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary-light);
  line-height: 1;
  font-family: Georgia, serif;
}

.testimonial-rating {
  display: flex;
  gap: 0.125rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.testimonial-text {
  color: var(--color-text);
  font-size: 0.9375rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border-light);
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 700;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.testimonial-meta {
  display: flex;
  flex-direction: column;
}

.testimonial-name {
  font-weight: 700;
  color: var(--color-text-dark);
  font-size: 0.95rem;
}

.testimonial-role {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* ===== CTA 区 ===== */
.cta-band {
  background:
    linear-gradient(135deg, var(--color-primary) 0%, #FF9027 100%);
  border-radius: var(--radius-xl);
  padding: 3.5rem 3rem;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  color: #FFFFFF;
  margin-bottom: 0.5rem;
  font-weight: 700;
}

.cta-desc {
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.0625rem;
  margin: 0;
}

.cta-actions {
  display: flex;
  gap: 1rem;
  position: relative;
  z-index: 1;
}

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

.btn-white:hover {
  background-color: #FAFAFA;
  color: var(--color-primary-active);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-outline-white {
  background-color: transparent;
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline-white:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  border-color: #FFFFFF;
}

/* ===== 子页面 Hero ===== */
.page-hero {
  padding: 4rem 0 3rem;
  background:
    radial-gradient(circle at 20% 20%, rgba(245, 130, 32, 0.06) 0%, transparent 50%),
    linear-gradient(180deg, #FFF8EE 0%, #FFFFFF 100%);
  text-align: center;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: var(--color-text-light);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb-sep {
  color: var(--color-text-muted);
}

.page-hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.page-hero-desc {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== 功能特性页 - 详细功能 ===== */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 4rem;
}

.feature-block:nth-child(even) .feature-block-visual {
  order: -1;
}

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

.feature-block-content .section-eyebrow {
  margin-bottom: 0.75rem;
}

.feature-block-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text-dark);
  line-height: 1.3;
}

.feature-block-desc {
  color: var(--color-text-light);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  color: var(--color-text);
}

.feature-list li::before {
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.feature-block-visual {
  aspect-ratio: 4 / 3;
  background-color: var(--color-primary-lighter);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-light);
}

.feature-block-visual svg {
  max-width: 100%;
  max-height: 100%;
}

/* ===== 跨平台展示 ===== */
.platforms-band {
  background-color: var(--color-text-dark);
  border-radius: var(--radius-xl);
  padding: 3.5rem 3rem;
  color: #FFFFFF;
  text-align: center;
}

.platforms-title {
  color: #FFFFFF;
  font-size: 1.75rem;
  margin-bottom: 0.625rem;
}

.platforms-desc {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2.5rem;
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.platform-card {
  padding: 2rem 1.5rem;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.platform-card:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: var(--color-primary);
}

.platform-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.platform-name {
  color: #FFFFFF;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.platform-version {
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.platform-req {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.8125rem;
  line-height: 1.6;
  margin: 0;
}

/* ===== 下载中心 - 平台卡片 ===== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.download-card {
  padding: 2.5rem 2rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: var(--transition);
  position: relative;
}

.download-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.download-card.recommended {
  border-color: var(--color-primary);
}

.download-card .recommended-badge {
  position: absolute;
  top: -0.75rem;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.875rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.download-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-light);
  border-radius: 50%;
}

.download-card-name {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.375rem;
}

.download-card-version {
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.download-card-meta {
  color: var(--color-text-light);
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-sm);
}

.download-card-meta strong {
  color: var(--color-text-dark);
  font-weight: 600;
}

.download-card .btn {
  width: 100%;
}

/* ===== 系统要求表格 ===== */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.specs-table thead {
  background-color: var(--color-text-dark);
}

.specs-table th {
  padding: 1.125rem 1.5rem;
  text-align: left;
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.9375rem;
}

.specs-table td {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border-light);
  color: var(--color-text);
  font-size: 0.9375rem;
}

.specs-table tbody tr:hover {
  background-color: var(--color-primary-lighter);
}

.specs-table td:first-child {
  font-weight: 600;
  color: var(--color-text-dark);
}

/* ===== 更新日志 ===== */
.changelog-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.changelog-version {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary-active);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.changelog-date {
  color: var(--color-text-light);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.changelog-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.changelog-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.6;
}

.changelog-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.changelog-tag.new {
  background-color: #E8F5E9;
  color: #2E7D32;
}

.changelog-tag.fix {
  background-color: #FFF4E5;
  color: #E6741C;
}

.changelog-tag.improve {
  background-color: #E3F2FD;
  color: #1565C0;
}

/* ===== 安装步骤 ===== */
.install-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.install-step {
  text-align: center;
  position: relative;
}

.install-step-num {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.install-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 28px;
  left: 60%;
  right: -40%;
  height: 2px;
  background: repeating-linear-gradient(
    to right,
    var(--color-primary) 0,
    var(--color-primary) 4px,
    transparent 4px,
    transparent 10px
  );
}

.install-step-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.5rem;
}

.install-step-desc {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ===== 关于我们 - 数据展示 ===== */
.stats-band {
  background:
    linear-gradient(135deg, var(--color-text-dark) 0%, #1A1A1A 100%);
  border-radius: var(--radius-xl);
  padding: 3.5rem 3rem;
  color: #FFFFFF;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-item-label {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9375rem;
}

/* ===== 关于我们 - 内容布局 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-content p {
  color: var(--color-text);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.about-content p:last-child {
  margin-bottom: 0;
}

.about-sidebar {
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid var(--color-border-light);
}

.about-sidebar h3 {
  font-size: 1.125rem;
  margin-bottom: 1.25rem;
  color: var(--color-text-dark);
}

.about-info-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-info-item {
  display: flex;
  flex-direction: column;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-light);
}

.about-info-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.about-info-label {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-bottom: 0.25rem;
}

.about-info-value {
  font-size: 0.9375rem;
  color: var(--color-text-dark);
  font-weight: 600;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2rem;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-year {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.timeline-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.375rem;
}

.timeline-desc {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin: 0;
}

/* ===== 社区参与 ===== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.community-card {
  padding: 2rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: var(--transition);
}

.community-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.community-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
}

.community-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.5rem;
}

.community-desc {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.community-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
}

.community-link:hover {
  gap: 0.5rem;
}

/* ===== 页脚 ===== */
.site-footer {
  background-color: var(--color-text-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .brand {
  color: #FFFFFF;
  margin-bottom: 1rem;
}

.footer-brand .brand .brand-name {
  color: #FFFFFF;
}

.footer-desc {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
  max-width: 320px;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.08);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.footer-social a:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.footer-col h4 {
  color: #FFFFFF;
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
  color: var(--color-primary);
}

/* ===== 下载弹窗 ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(44, 44, 44, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-bg);
  border-radius: var(--radius-xl);
  max-width: 560px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.95);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--color-border-light);
}

.modal-title {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin: 0;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 1.5rem;
  line-height: 1;
  transition: var(--transition);
}

.modal-close:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-text-dark);
}

.modal-body {
  padding: 2rem;
}

.modal-subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 1.75rem;
  font-size: 0.95rem;
}

.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.qr-item {
  text-align: center;
  padding: 1.5rem 1rem;
  background-color: var(--color-bg-soft);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.qr-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.qr-img {
  width: 160px;
  height: 160px;
  margin: 0 auto 0.875rem;
  display: block;
}

.qr-platform {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.25rem;
}

.qr-tip {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin: 0;
}

.modal-footer {
  padding: 1.25rem 2rem;
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border-light);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.modal-footer a {
  color: var(--color-primary);
  font-weight: 600;
}

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .hero-grid,
  .feature-block,
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .feature-block:nth-child(even) .feature-block-visual {
    order: 0;
  }

  .features-grid,
  .testimonials-grid,
  .download-grid,
  .community-grid,
  .install-steps {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .install-step:not(:last-child)::after {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .hero-visual {
    order: -1;
  }

  .hero-visual img {
    max-width: 480px;
  }
}

@media (max-width: 720px) {
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.5rem 1.5rem;
    gap: 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    transition: transform 0.3s ease;
    border-bottom: 1px solid var(--color-border-light);
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .nav-link {
    padding: 0.875rem 0;
    border-bottom: 1px solid var(--color-border-light);
  }

  .nav-link::after {
    display: none;
  }

  .nav-actions {
    gap: 0.5rem;
  }

  .nav-actions .btn:not(.nav-toggle) {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

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

  .features-grid,
  .testimonials-grid,
  .download-grid,
  .platforms-grid,
  .community-grid,
  .install-steps,
  .stats-grid {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding: 3rem 0 2.5rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 1.5rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .cta-band,
  .platforms-band,
  .stats-band {
    padding: 2.5rem 1.75rem;
    flex-direction: column;
    text-align: center;
  }

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

  .specs-table {
    font-size: 0.875rem;
  }

  .specs-table th,
  .specs-table td {
    padding: 0.75rem;
  }
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-lg { margin-top: 3rem; }
.mb-lg { margin-bottom: 3rem; }

/* ===== 滚动显示动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .hero-visual img {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}