/* PotPlayer 官方网站样式 */

/* 基础重置与全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a73e8;
  --primary-dark: #0d47a1;
  --primary-light: #4a90d9;
  --accent: #ff6b35;
  --dark: #1a1a2e;
  --dark-light: #16213e;
  --dark-medium: #0f3460;
  --text: #333;
  --text-light: #666;
  --text-white: #fff;
  --bg-white: #fff;
  --bg-light: #f8f9fa;
  --bg-gray: #e9ecef;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "微软雅黑", sans-serif;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(20px);
  padding: 0 40px;
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 0 40px;
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--text-white);
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
}

.nav-logo span {
  color: var(--primary-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-light);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-download-btn {
  background: var(--primary);
  color: var(--text-white);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.nav-download-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* Hero 区域 */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-medium) 50%, var(--primary-dark) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 40px 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 60px;
  width: 100%;
}

.hero-content {
  flex: 1;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: rgba(26, 115, 232, 0.2);
  color: var(--primary-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  border: 1px solid rgba(26, 115, 232, 0.3);
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.2;
  margin-bottom: 10px;
}

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

.hero-subtitle {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 30px;
  line-height: 1.6;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--text-white);
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-white);
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.hero-download-tip {
  margin-top: 16px;
  font-size: 14px;
  text-align: left;
}

.hero-download-tip a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  transition: var(--transition);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.hero-download-tip a:hover {
  color: #fff;
  text-decoration: underline;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item {
  text-align: left;
}

.stat-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-white);
}

.stat-number span {
  color: var(--primary-light);
}

.stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 4px;
}

.hero-image {
  flex: 1;
  z-index: 1;
  position: relative;
}

.hero-image-wrapper {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.hero-image-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 80%;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.2) 0%, transparent 70%);
  z-index: -1;
  filter: blur(40px);
}

/* 特性区域 */
.features {
  padding: 100px 40px;
  background: var(--bg-white);
}

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

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

.section-tag {
  display: inline-block;
  background: rgba(26, 115, 232, 0.1);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

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

.feature-card {
  background: var(--bg-light);
  padding: 30px;
  border-radius: var(--radius);
  transition: var(--transition);
  border: 1px solid transparent;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(26, 115, 232, 0.1);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 22px;
  color: white;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

/* 亮点区域 */
.highlight {
  padding: 100px 40px;
  background: var(--bg-light);
}

.highlight-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 80px;
}

.highlight-image {
  flex: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.highlight-image img {
  width: 100%;
  height: auto;
}

.highlight-content {
  flex: 1;
}

.highlight-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 30px;
}

.highlight-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.highlight-list li:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.highlight-list .check-icon {
  width: 24px;
  height: 24px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  flex-shrink: 0;
}

.highlight-list .item-content h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 4px;
}

.highlight-list .item-content p {
  font-size: 14px;
  color: var(--text-light);
}

/* 下载区域 */
.download {
  padding: 100px 40px;
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-medium) 100%);
  position: relative;
}

.download::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(26, 115, 232, 0.1) 0%, transparent 50%);
}

.download-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  z-index: 1;
  position: relative;
}

.download .section-title {
  color: var(--text-white);
}

.download .section-desc {
  color: rgba(255, 255, 255, 0.6);
}

.download-cards {
  display: flex;
  gap: 24px;
  margin-top: 50px;
  justify-content: center;
}

.download-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 30px;
  width: 280px;
  transition: var(--transition);
}

.download-card:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(26, 115, 232, 0.3);
  transform: translateY(-5px);
}

.download-card .card-icon {
  width: 60px;
  height: 60px;
  background: rgba(26, 115, 232, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 28px;
  color: var(--primary-light);
}

.download-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 8px;
}

.download-card .version {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 16px;
}

.download-card .card-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 24px;
  line-height: 1.6;
}

.download-card .btn-card {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: var(--text-white);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.download-card .btn-card:hover {
  background: var(--primary-dark);
}

/* 页脚 */
.footer {
  background: var(--dark);
  padding: 60px 40px 30px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-white);
}

.footer-logo .logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: white;
}

.footer-logo span {
  color: var(--primary-light);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 30px;
  font-size: 13px;
}

/* ========= 子页面通用样式 ========= */

/* 页面 Banner */
.page-banner {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-medium) 50%, var(--primary-dark) 100%);
  padding: 140px 40px 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(26, 115, 232, 0.12) 0%, transparent 70%);
  border-radius: 50%;
}

.page-banner-title {
  font-size: 42px;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 16px;
}

.page-banner-title span {
  color: var(--primary-light);
}

.page-banner-desc {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.65);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.page-banner-breadcrumb {
  margin-top: 24px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.45);
}

.page-banner-breadcrumb a {
  color: rgba(255, 255, 255, 0.55);
  transition: var(--transition);
}

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

.page-banner-breadcrumb .separator {
  margin: 0 8px;
}

/* 页面内容区域 */
.page-content {
  padding: 80px 40px;
}

.page-container {
  max-width: 1200px;
  margin: 0 auto;
}

/* ========= 功能详情页 ========= */

.feature-detail {
  display: flex;
  align-items: center;
  gap: 60px;
  padding: 50px 0;
  border-bottom: 1px solid var(--bg-gray);
}

.feature-detail:last-child {
  border-bottom: none;
}

.feature-detail.reverse {
  flex-direction: row-reverse;
}

.feature-detail-image {
  flex: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.feature-detail-info {
  flex: 1;
}

.feature-detail-info .detail-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 26px;
  color: white;
}

.feature-detail-info h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.feature-detail-info p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.feature-detail-info ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-detail-info ul li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-light);
}

.feature-detail-info ul li::before {
  content: '✓';
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  color: white;
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ========= 下载页 ========= */

.download-page-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-top: 40px;
}

.download-page-card {
  background: var(--bg-light);
  border: 1px solid var(--bg-gray);
  border-radius: var(--radius);
  padding: 36px;
  transition: var(--transition);
}

.download-page-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
  border-color: rgba(26, 115, 232, 0.15);
}

.download-page-card .dl-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: white;
  margin-bottom: 20px;
}

.download-page-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.download-page-card .dl-version {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.download-page-card .dl-meta {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 16px;
  display: flex;
  gap: 16px;
}

.download-page-card .dl-desc {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 24px;
}

.download-page-card .btn-dl {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: var(--text-white);
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}

.download-page-card .btn-dl:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.download-page-card .btn-dl-secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
  margin-left: 10px;
}

.download-page-card .btn-dl-secondary:hover {
  background: rgba(26, 115, 232, 0.08);
}

.dl-tip {
  margin-top: 16px;
  font-size: 13px;
}

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

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

/* 系统要求 & 更新日志 */
.info-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-top: 60px;
}

.info-box {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 36px;
  border: 1px solid var(--bg-gray);
}

.info-box h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.info-box h3 .box-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
}

.info-box ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.info-box ul li {
  font-size: 14px;
  color: var(--text-light);
  padding: 10px 14px;
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.info-box ul li strong {
  color: var(--dark);
}

/* ========= 使用指南页 ========= */

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.guide-card {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 30px;
  border: 1px solid transparent;
  transition: var(--transition);
}

.guide-card:hover {
  box-shadow: var(--shadow);
  border-color: rgba(26, 115, 232, 0.1);
}

.guide-card .guide-number {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 16px;
}

.guide-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}

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

.guide-card .guide-steps {
  margin-top: 16px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.guide-card .guide-steps li {
  font-size: 14px;
  color: var(--text-light);
  padding: 8px 12px;
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

/* 快捷键表格 */
.shortcut-section {
  margin-top: 60px;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.shortcut-table th {
  background: var(--dark);
  color: var(--text-white);
  font-size: 14px;
  font-weight: 600;
  padding: 14px 20px;
  text-align: left;
}

.shortcut-table td {
  padding: 12px 20px;
  font-size: 14px;
  color: var(--text-light);
  border-bottom: 1px solid var(--bg-gray);
}

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

.shortcut-table tr:hover td {
  background: var(--bg-light);
}

.shortcut-table kbd {
  background: var(--bg-light);
  border: 1px solid var(--bg-gray);
  border-radius: 4px;
  padding: 2px 8px;
  font-family: inherit;
  font-size: 13px;
  color: var(--dark);
}

/* FAQ */
.faq-section {
  margin-top: 60px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--bg-gray);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

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

.faq-question .toggle-icon {
  font-size: 20px;
  color: var(--primary);
  transition: var(--transition);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
}

/* ========= 关于页 ========= */

.about-intro {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-bottom: 60px;
}

.about-intro-image {
  flex: 1;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.about-intro-image img {
  width: 100%;
  height: auto;
}

.about-intro-text {
  flex: 1;
}

.about-intro-text h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}

.about-intro-text p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 40px;
  margin-top: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--bg-gray);
}

.timeline-item {
  position: relative;
  padding-bottom: 36px;
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--primary);
  border-radius: 50%;
  border: 3px solid var(--bg-white);
  box-shadow: 0 0 0 2px var(--primary);
}

.timeline-item .timeline-year {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.timeline-item h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

/* 团队/技术卡片 */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 30px;
}

.tech-card {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.tech-card:hover {
  box-shadow: var(--shadow);
  border-color: rgba(26, 115, 232, 0.1);
}

.tech-card .tech-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 22px;
  color: white;
}

.tech-card h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.tech-card p {
  font-size: 13px;
  color: var(--text-light);
}

/* 子页面响应式 */
@media (max-width: 1024px) {
  .feature-detail {
    flex-direction: column;
    gap: 30px;
  }

  .feature-detail.reverse {
    flex-direction: column;
  }

  .download-page-grid,
  .info-columns,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .about-intro {
    flex-direction: column;
  }

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

@media (max-width: 768px) {
  .page-banner {
    padding: 120px 20px 60px;
  }

  .page-banner-title {
    font-size: 30px;
  }

  .page-content {
    padding: 40px 20px;
  }

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

  .download-page-card .btn-dl-secondary {
    margin-left: 0;
    margin-top: 10px;
  }
}

/* 响应式 */
@media (max-width: 1024px) {
  .hero-container {
    flex-direction: column;
    text-align: center;
  }

  .hero-title {
    font-size: 40px;
  }

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

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

  .highlight-container {
    flex-direction: column;
  }

  .download-cards {
    flex-direction: column;
    align-items: center;
  }

  .nav-links {
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0 20px;
  }

  .nav-links {
    display: none;
  }

  .hero {
    padding: 80px 20px 40px;
  }

  .hero-title {
    font-size: 32px;
  }

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

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

  .hero-stats {
    gap: 20px;
  }

  .stat-number {
    font-size: 22px;
  }

  .features {
    padding: 60px 20px;
  }

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

  .highlight {
    padding: 60px 20px;
  }

  .download {
    padding: 60px 20px;
  }

  .download-card {
    width: 100%;
    max-width: 320px;
  }

  .footer {
    padding: 40px 20px 20px;
  }

  .footer-top {
    flex-direction: column;
    gap: 20px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
}