/* ============================================
   Chrome 安全下载站 — 全局样式表
   纯原生 CSS，无框架依赖
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --accent: #34a853;
  --accent-light: #e6f4ea;
  --warning: #fbbc04;
  --danger: #ea4335;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-muted: #80868b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f4;
  --border: #dadce0;
  --shadow-sm: 0 1px 2px 0 rgba(60,64,67,0.08), 0 1px 6px 1px rgba(60,64,67,0.04);
  --shadow-md: 0 4px 8px 0 rgba(60,64,67,0.12), 0 2px 4px 0 rgba(60,64,67,0.08);
  --shadow-lg: 0 8px 16px 0 rgba(60,64,67,0.16), 0 4px 8px 0 rgba(60,64,67,0.10);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --nav-height: 64px;
  --transition: all 0.25s ease;
}

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

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

body {
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

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

ul, ol {
  list-style: none;
}

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

.section {
  padding: 80px 0;
}

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

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--text-primary);
  line-height: 1.3;
}

.section-subtitle {
  font-size: 1.1rem;
  text-align: center;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 48px;
}

.text-center {
  text-align: center;
}

/* ---------- spin 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 pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: #fff;
}

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

.btn-lg {
  padding: 18px 48px;
  font-size: 1.15rem;
  border-radius: var(--radius-lg);
}

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

.btn-outline:hover {
  background: var(--primary-light);
  text-decoration: none;
  color: var(--primary);
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none !important;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--text-primary);
}

.nav-brand svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.nav-menu {
  display: flex;
  gap: 32px;
}

.nav-menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 0;
  position: relative;
}

.nav-menu a:hover {
  color: var(--primary);
  text-decoration: none;
}

.nav-menu a.active {
  color: var(--primary);
  font-weight: 600;
}

.nav-menu a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

/* ---------- Hero ---------- */
.hero {
  padding: 140px 0 100px;
  background: linear-gradient(180deg, #fff 0%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: -100px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
  opacity: 0.6;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: var(--accent);
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-title span {
  color: var(--primary);
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.hero-note {
  margin-top: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ---------- 特性卡片 ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.feature-icon.blue { background: var(--primary-light); color: var(--primary); }
.feature-icon.green { background: var(--accent-light); color: var(--accent); }
.feature-icon.yellow { background: #fef3e8; color: #f9ab00; }
.feature-icon.red { background: #fce8e6; color: var(--danger); }
.feature-icon.purple { background: #f3e8fd; color: #9334e6; }
.feature-icon.teal { background: #e6f7f5; color: #00897b; }

.feature-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

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

/* ---------- 平台入口 ---------- */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
  transition: var(--transition);
}

.platform-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
  transform: translateY(-3px);
}

.platform-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.platform-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.platform-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.platform-btn {
  width: 100%;
}

/* ---------- 功能详解 ---------- */
.function-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 64px;
}

.function-block:nth-child(even) {
  direction: rtl;
}

.function-block:nth-child(even) > * {
  direction: ltr;
}

.function-content h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.function-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}

.function-visual {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  border: 1px solid var(--border);
}

.function-visual svg {
  max-width: 100%;
  height: auto;
}

/* ---------- 用户评价 ---------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-md);
}

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  color: var(--warning);
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

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

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.875rem;
  flex-shrink: 0;
}

.review-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.review-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- 数据统计 ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
  line-height: 1;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ---------- 对比表格 ---------- */
.compare-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-primary);
  font-size: 0.95rem;
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.compare-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.compare-table td {
  color: var(--text-secondary);
}

.compare-table tr:last-child td {
  border-bottom: none;
}

.compare-table .col-chrome {
  color: var(--primary);
  font-weight: 600;
}

.compare-check {
  color: var(--accent);
  font-weight: 700;
}

.compare-cross {
  color: var(--danger);
  font-weight: 700;
}

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

.faq-item {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--primary);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
}

.faq-question svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

.faq-answer-inner p + p {
  margin-top: 12px;
}

/* ---------- 下载页专用 ---------- */
.download-hero {
  padding: 140px 0 60px;
  background: linear-gradient(135deg, var(--primary-light) 0%, #fff 50%, var(--accent-light) 100%);
  text-align: center;
}

.download-main {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 48px;
  max-width: 700px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.download-main .platform-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
}

.download-main h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.download-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.download-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.platforms-section .platforms-grid {
  grid-template-columns: repeat(3, 1fr);
}

/* ---------- 安装步骤 ---------- */
.steps-list {
  max-width: 800px;
  margin: 0 auto;
}

.step-item {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
  position: relative;
}

.step-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 56px;
  bottom: -16px;
  width: 2px;
  background: var(--border);
}

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
  z-index: 1;
}

.step-content h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  margin-top: 12px;
}

.step-content p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ---------- 系统要求 ---------- */
.sysreq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.sysreq-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.sysreq-card h4 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.sysreq-card ul {
  list-style: none;
}

.sysreq-card li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--bg-tertiary);
}

.sysreq-card li:last-child {
  border-bottom: none;
}

.sysreq-card li svg {
  flex-shrink: 0;
  color: var(--accent);
}

/* ---------- 版本日志 ---------- */
.changelog-list {
  max-width: 800px;
  margin: 0 auto;
}

.changelog-item {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  transition: var(--transition);
}

.changelog-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

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

.changelog-version {
  background: var(--primary);
  color: #fff;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
}

.changelog-date {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.changelog-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

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

.changelog-body li {
  margin-bottom: 6px;
}

/* ---------- 安全说明 ---------- */
.security-box {
  background: var(--accent-light);
  border: 1px solid #b7e1c6;
  border-radius: var(--radius-md);
  padding: 32px;
  max-width: 800px;
  margin: 0 auto;
}

.security-box h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
}

.security-box p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ---------- SEO 引导页专用 ---------- */
.article-content {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-secondary);
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 48px 0 20px;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 32px 0 14px;
}

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

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

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

.article-content strong {
  color: var(--text-primary);
}

.article-cta {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  margin: 48px 0;
}

.article-cta h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.article-cta p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ---------- 页脚 ---------- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-brand svg {
  width: 28px;
  height: 28px;
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.footer-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 6px 0;
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-safe {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

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

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

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

/* ---------- 回到顶部 ---------- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .function-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .function-block:nth-child(even) {
    direction: ltr;
  }
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .platforms-section .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .hero-title {
    font-size: 2.4rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    gap: 0;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav-menu a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-menu a:last-child {
    border-bottom: none;
  }
  .nav-menu a.active::after {
    display: none;
  }
  .nav-menu a.active {
    background: var(--primary-light);
    margin: 0 -24px;
    padding: 12px 24px;
  }
  .nav-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 1.9rem;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .section-title {
    font-size: 1.7rem;
  }
  .section {
    padding: 56px 0;
  }
  .features-grid,
  .stats-grid,
  .reviews-grid,
  .platforms-grid,
  .platforms-section .platforms-grid,
  .sysreq-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .download-main {
    padding: 32px 24px;
  }
  .function-visual {
    min-height: 200px;
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero {
    padding: 120px 0 60px;
  }
  .hero-stats {
    gap: 24px;
  }
  .hero-stat-value {
    font-size: 1.4rem;
  }
}