/* ========================================
   Quickq 官网 - Q4 深靛青主题
   配色: 深靛青 #1a1a2e | 天蓝青 #0f4c75 | 暖橙 #f97316 | 亮青 #3ec1d3
   ======================================== */

/* CSS 变量 */
:root {
  /* 主色调 */
  --primary-color: #0f4c75;
  --primary-dark: #0a3a5c;
  --primary-light: #1a6fa3;
  --accent-color: #f97316;
  --accent-dark: #ea580c;
  --accent-light: #fb923c;
  --secondary-color: #3ec1d3;
  --secondary-dark: #2ab4c8;
  
  /* 背景色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-dark: #1a1a2e;
  --bg-darker: #0f0f1a;
  
  /* 文字色 */
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-light: #e2e8f0;
  --text-white: #ffffff;
  
  /* 边框 */
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --shadow-primary: 0 4px 14px rgba(15,76,117,0.25);
  --shadow-primary-lg: 0 8px 24px rgba(15,76,117,0.35);
  --shadow-accent: 0 4px 14px rgba(249,115,22,0.25);
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-color);
  color: white;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  z-index: 9999;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 10px;
}

/* ========================================
   工具类
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  z-index: 100;
  display: flex;
  align-items: center;
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--primary-color);
  background: rgba(15,76,117,0.08);
}

.nav-link.active {
  color: var(--primary-color);
  background: rgba(15,76,117,0.1);
}

.nav-btn {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-primary);
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-lg);
  color: white;
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.mobile-menu-btn span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ========================================
   通用按钮
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-lg);
  color: white;
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

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

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

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

.btn-block {
  display: flex;
  width: 100%;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.0625rem;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.9375rem;
}

.btn-white {
  background: white;
  color: var(--primary-color);
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--primary-color);
}

/* ========================================
   通用 Section
   ======================================== */
.section {
  padding: 80px 24px;
}

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
}

/* ========================================
   Page Header
   ======================================== */
.page-header {
  background: linear-gradient(135deg, var(--bg-dark) 0%, #16213e 100%);
  padding: 120px 24px 60px;
  text-align: center;
}

.page-header h1 {
  font-size: 2.75rem;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.125rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 20px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

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

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

/* ========================================
   Hero 区域
   ======================================== */
.hero {
  background: linear-gradient(135deg, var(--bg-dark) 0%, #16213e 50%, #1a1a2e 100%);
  padding: 140px 24px 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(62,193,211,0.15) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, rgba(249,115,22,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 3.25rem;
  font-weight: 800;
  color: white;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 36px;
  line-height: 1.7;
}

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

.hero-btn-primary {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
  color: white;
  padding: 16px 32px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1.0625rem;
  box-shadow: var(--shadow-accent);
  transition: all var(--transition-normal);
}

.hero-btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(249,115,22,0.4);
  color: white;
}

.hero-btn-secondary {
  background: rgba(255,255,255,0.1);
  color: white;
  padding: 16px 32px;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1.0625rem;
  border: 2px solid rgba(255,255,255,0.3);
  transition: all var(--transition-normal);
}

.hero-btn-secondary:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.5);
  color: white;
}

/* ========================================
   特性区域
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

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

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(15,76,117,0.1), rgba(62,193,211,0.1));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   下载区域
   ======================================== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

.download-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

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

.download-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.download-card-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(15,76,117,0.1), rgba(62,193,211,0.1));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
}

.download-card-info h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.platform-tag {
  font-size: 0.8125rem;
  color: var(--primary-color);
  background: rgba(15,76,117,0.1);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-weight: 500;
}

.download-card-body {
  flex: 1;
  margin-bottom: 20px;
}

.download-card-body p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.download-card .btn {
  margin-top: auto;
}

/* 平台图标颜色 */
.platform-windows { background: linear-gradient(135deg, rgba(0,120,215,0.15), rgba(0,120,215,0.05)); }
.platform-macos { background: linear-gradient(135deg, rgba(0,0,0,0.08), rgba(0,0,0,0.03)); }
.platform-linux { background: linear-gradient(135deg, rgba(237,76,44,0.12), rgba(237,76,44,0.05)); }
.platform-android { background: linear-gradient(135deg, rgba(61,220,132,0.15), rgba(61,220,132,0.05)); }
.platform-ios { background: linear-gradient(135deg, rgba(88,86,214,0.12), rgba(88,86,214,0.05)); }

/* ========================================
   步骤区域
   ======================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.step-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 32px;
  text-align: center;
  transition: all var(--transition-normal);
}

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

.step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 auto 20px;
}

.step-number-blue {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
}

.step-number-purple {
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  color: white;
}

.step-number-green {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
}

.step-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

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

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

.faq-item summary {
  padding: 20px 24px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--primary-color);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background: var(--bg-secondary);
}

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

/* ========================================
   CTA 区域
   ======================================== */
.cta-section {
  background: linear-gradient(135deg, var(--bg-dark) 0%, #16213e 100%);
  padding: 80px 24px;
  text-align: center;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  color: white;
  margin-bottom: 12px;
}

.cta-section p {
  font-size: 1.0625rem;
  color: var(--text-light);
  margin-bottom: 28px;
}

/* ========================================
   下载弹窗
   ======================================== */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all 250ms ease;
  padding: 1rem;
}

.popup-overlay.active {
  opacity: 1;
  visibility: visible;
}

.popup {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  max-width: 420px;
  width: 100%;
  text-align: center;
  transform: scale(0.9);
  transition: transform 250ms ease;
  box-shadow: var(--shadow-xl);
  position: relative;
}

.popup-overlay.active .popup {
  transform: scale(1);
}

.popup-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  background: var(--bg-secondary);
  border: none;
  border-radius: 50%;
  font-size: 1.25rem;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.popup-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.popup-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, rgba(15,76,117,0.12), rgba(62,193,211,0.12));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 1.25rem;
}

.popup h3 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.popup p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  line-height: 1.7;
}

.popup-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--bg-dark);
  padding: 60px 24px 30px;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  margin-bottom: 16px;
}

.footer-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.footer-column h4 {
  color: white;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-column ul li {
  margin-bottom: 12px;
}

.footer-column ul li a {
  color: var(--text-muted);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

.footer-column ul li a:hover {
  color: var(--secondary-color);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ========================================
   动画
   ======================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
  }
  
  .navbar-nav.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1.0625rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .page-header h1 {
    font-size: 2rem;
  }
  
  .section {
    padding: 60px 16px;
  }
  
  .section-header h2 {
    font-size: 1.75rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .download-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
}