/* ===== 每日大赛APP下载承接页 - 第28套模板样式 ===== */
:root {
  --primary: #2563EB;
  --secondary: #FFFFFF;
  --bg: #F8FBFF;
  --card: #FFFFFF;
  --accent: #00C2A8;
  --text: #111827;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,0.12);
  --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Courier New', monospace;
  --transition: all 0.3s ease;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ===== Layout ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-title {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--text);
}
.section-subtitle {
  text-align: center;
  color: #6B7280;
  font-size: 1.1rem;
  margin-bottom: 48px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Header ===== */
.site-header {
  background: var(--secondary);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 16px 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-logo {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}
.site-nav { display: flex; gap: 24px; align-items: center; }
.site-nav a { font-size: 0.95rem; color: var(--text); font-weight: 500; }
.site-nav a:hover { color: var(--primary); }
.nav-toggle { display: none; cursor: pointer; flex-direction: column; gap: 5px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); transition: var(--transition); }

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #1D4ED8 100%);
  color: var(--secondary);
  padding: 100px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 30px 30px;
}
.hero-content { position: relative; z-index: 2; }
.hero h1 {
  font-family: var(--font-title);
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.hero .subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero-phone {
  max-width: 280px;
  margin: 0 auto 40px;
  border-radius: 32px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--secondary); color: var(--primary); }
.btn-primary:hover { background: #E0E7FF; transform: translateY(-2px); }
.btn-accent { background: var(--accent); color: var(--secondary); }
.btn-accent:hover { background: #00A896; transform: translateY(-2px); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--secondary); }

/* ===== Phone Mockup ===== */
.phone-mockup {
  width: 280px;
  height: 560px;
  background: #000;
  border-radius: 40px;
  padding: 12px;
  margin: 0 auto;
  box-shadow: var(--shadow);
  position: relative;
}
.phone-mockup-inner {
  width: 100%;
  height: 100%;
  background: var(--secondary);
  border-radius: 30px;
  overflow: hidden;
  position: relative;
}
.phone-mockup-inner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Feature Slider ===== */
.feature-slider { overflow: hidden; position: relative; }
.feature-slides {
  display: flex;
  transition: transform 0.5s ease;
}
.feature-slide {
  min-width: 100%;
  padding: 40px 20px;
  text-align: center;
}
.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--secondary);
}
.feature-slide h3 { font-size: 1.4rem; margin-bottom: 12px; }
.feature-slide p { color: #6B7280; max-width: 480px; margin: 0 auto; }
.slider-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}
.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #D1D5DB;
  cursor: pointer;
  transition: var(--transition);
}
.slider-dot.active { background: var(--primary); transform: scale(1.3); }

/* ===== Install Steps ===== */
.install-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.install-step {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
  transition: var(--transition);
}
.install-step:hover { transform: translateY(-6px); }
.install-step::before {
  counter-increment: step;
  content: counter(step);
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.2;
  position: absolute;
  top: 16px;
  left: 20px;
}
.install-step h4 { font-size: 1.1rem; margin-bottom: 8px; margin-top: 16px; }
.install-step p { font-size: 0.9rem; color: #6B7280; }

/* ===== Permission Table ===== */
.permission-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.permission-table th {
  background: var(--primary);
  color: var(--secondary);
  padding: 16px 20px;
  text-align: left;
  font-weight: 600;
}
.permission-table td {
  padding: 14px 20px;
  border-bottom: 1px solid #E5E7EB;
}
.permission-table tr:last-child td { border-bottom: none; }
.permission-table tr:hover td { background: #F0F7FF; }

/* ===== QR Code Section ===== */
.qr-section {
  background: var(--card);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 480px;
  margin: 0 auto;
}
.qr-code {
  width: 200px;
  height: 200px;
  margin: 0 auto 24px;
  background: var(--bg);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: breathe 3s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(37,99,235,0.2); }
  50% { box-shadow: 0 0 0 12px rgba(37,99,235,0); }
}
.qr-tip { font-size: 0.85rem; color: #6B7280; margin-top: 16px; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  overflow: hidden;
}
.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question::after { content: '+'; font-size: 1.5rem; color: var(--primary); }
.faq-item.active .faq-question::after { content: '-'; }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-item.active .faq-answer {
  padding: 0 24px 20px;
  max-height: 500px;
}

/* ===== Cards Grid ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.card {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0,0,0,0.16); }
.card-img { width: 100%; height: 200px; object-fit: cover; }
.card-body { padding: 24px; }
.card-body h3 { font-size: 1.2rem; margin-bottom: 8px; }
.card-body p { color: #6B7280; font-size: 0.95rem; }

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.85rem;
  color: #6B7280;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

/* ===== Page Content ===== */
.page-content {
  background: var(--card);
  border-radius: var(--radius);
  padding: 48px;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}
.page-content h1 { font-size: 2rem; margin-bottom: 24px; color: var(--text); }
.page-content h2 { font-size: 1.5rem; margin: 32px 0 16px; color: var(--text); }
.page-content h3 { font-size: 1.2rem; margin: 24px 0 12px; color: var(--text); }
.page-content p { margin-bottom: 16px; line-height: 1.9; }
.page-content ul, .page-content ol { margin: 16px 0; padding-left: 24px; }
.page-content li { margin-bottom: 8px; list-style: disc; }

/* ===== Footer ===== */
.site-footer {
  background: #1E293B;
  color: #94A3B8;
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 { color: var(--secondary); font-size: 1rem; margin-bottom: 16px; }
.footer-col a { display: block; color: #94A3B8; margin-bottom: 10px; font-size: 0.9rem; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}
.footer-bottom a { color: var(--accent); }

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.slide-in-left.visible { opacity: 1; transform: translateX(0); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero .subtitle { font-size: 1rem; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .install-steps { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .site-nav { 
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--secondary);
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow);
  }
  .site-nav.active { display: flex; }
  .nav-toggle { display: flex; }
  .page-content { padding: 24px; }
  .qr-section { padding: 32px 20px; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-buttons { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .install-steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-24 { margin-top: 24px; }
.mt-48 { margin-top: 48px; }
.mb-24 { margin-bottom: 24px; }
.mb-48 { margin-bottom: 48px; }
.highlight { color: var(--primary); font-weight: 600; }
.tag {
  display: inline-block;
  background: #EFF6FF;
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}