/* ========================================
   红桃视频app - 统一样式文件
   ======================================== */

/* CSS Variables */
:root {
  --primary: #E63946;
  --secondary: #1D3557;
  --accent: #F4A261;
  --background: #F1FAEE;
  --text: #1D3557;
  --text-light: #457B9D;
  --border: #E9ECEF;
  --shadow: rgba(0, 0, 0, 0.1);
  --gradient: linear-gradient(135deg, #E63946, #F4A261);
  --gradient-subtle: linear-gradient(180deg, #F1FAEE 0%, #FFFFFF 100%);
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul, ol {
  list-style: none;
}

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

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

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

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: clamp(1rem, 2vw, 1.25rem); }

p {
  color: var(--text-light);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(241, 250, 238, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: bold;
}

.nav {
  display: flex;
  gap: 8px;
}

.nav a {
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 500;
  color: var(--text);
  transition: all 0.3s ease;
}

.nav a:hover,
.nav a.active {
  background: var(--primary);
  color: white;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-subtle);
  overflow: hidden;
  padding-top: 70px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: var(--gradient);
  opacity: 0.1;
  border-radius: 50% 0 0 50%;
  filter: blur(100px);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease;
}

.hero-text p {
  font-size: 1.125rem;
  margin-bottom: 30px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-cta {
  display: flex;
  gap: 16px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-visual {
  position: relative;
  animation: fadeInRight 1s ease 0.3s both;
}

.hero-image {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  aspect-ratio: 4/5;
  background: var(--gradient);
  border-radius: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 8rem;
  box-shadow: 0 40px 80px rgba(230, 57, 70, 0.3);
  position: relative;
  overflow: hidden;
}

.hero-image::before {
  content: '♥';
  position: relative;
  z-index: 1;
}

/* Floating Elements */
.floating-card {
  position: absolute;
  background: white;
  padding: 16px 20px;
  border-radius: 16px;
  box-shadow: 0 10px 40px var(--shadow);
  animation: float 3s ease-in-out infinite;
}

.floating-card.top-right {
  top: 10%;
  right: -20px;
  animation-delay: 0.5s;
}

.floating-card.bottom-left {
  bottom: 20%;
  left: -30px;
  animation-delay: 1s;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--gradient);
  color: white;
  box-shadow: 0 4px 20px rgba(230, 57, 70, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(230, 57, 70, 0.4);
}

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

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

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

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

/* ========================================
   Section Styles
   ======================================== */
.section {
  padding: 100px 0;
}

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

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
}

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

.section-dark h2,
.section-dark h3 {
  color: white;
}

.section-dark p {
  color: rgba(255, 255, 255, 0.7);
}

/* ========================================
   Cards
   ======================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.card {
  background: white;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px var(--shadow);
}

.card-image {
  aspect-ratio: 16/10;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 3rem;
}

.card-content {
  padding: 24px;
}

.card-content h3 {
  margin-bottom: 12px;
}

.card-content p {
  font-size: 0.95rem;
}

/* Video Card */
.video-card {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
}

.video-card .card-image {
  aspect-ratio: 1/1;
  transition: transform 0.5s ease;
}

.video-card:hover .card-image {
  transform: scale(1.05);
}

.video-card .play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70px;
  height: 70px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-size: 2rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-card:hover .play-icon {
  opacity: 1;
}

.video-card .duration {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
}

/* Category Card */
.category-card {
  position: relative;
  height: 200px;
  border-radius: 20px;
  overflow: hidden;
  cursor: pointer;
}

.category-card .card-image {
  height: 100%;
  transition: transform 0.5s ease;
}

.category-card:hover .card-image {
  transform: scale(1.1);
}

.category-card .card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: white;
  padding: 30px 24px 24px;
}

.category-card h3 {
  color: white;
  margin-bottom: 4px;
}

.category-card p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
}

/* ========================================
   Stats
   ======================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

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

.stat-number {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  color: var(--text-light);
  font-size: 1rem;
}

/* ========================================
   Features
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.feature-item {
  text-align: center;
  padding: 40px 30px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease;
}

.feature-item:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 2.5rem;
  color: white;
}

.feature-item h3 {
  margin-bottom: 12px;
  color: white;
}

.feature-item p {
  color: rgba(255, 255, 255, 0.7);
}

/* ========================================
   Creator Card
   ======================================== */
.creator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.creator-card {
  background: white;
  border-radius: 20px;
  padding: 30px;
  display: flex;
  gap: 20px;
  align-items: center;
  box-shadow: 0 4px 20px var(--shadow);
  transition: all 0.3s ease;
}

.creator-card:hover {
  transform: translateX(10px);
  box-shadow: 0 10px 40px var(--shadow);
}

.creator-avatar {
  width: 80px;
  height: 80px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  flex-shrink: 0;
}

.creator-info h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.creator-info .tag {
  display: inline-block;
  background: rgba(230, 57, 70, 0.1);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.creator-stats {
  display: flex;
  gap: 16px;
  font-size: 0.9rem;
  color: var(--text-light);
}

/* ========================================
   Download Section
   ======================================== */
.download-section {
  background: var(--gradient);
  border-radius: 30px;
  padding: 80px 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin: 0 20px;
}

.download-content h2 {
  color: white;
  margin-bottom: 20px;
}

.download-content p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.125rem;
  margin-bottom: 30px;
}

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

.download-buttons .btn {
  background: white;
  color: var(--primary);
}

.download-buttons .btn:hover {
  background: var(--secondary);
  color: white;
}

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

.qr-code {
  width: 200px;
  height: 200px;
  background: white;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 5rem;
  color: var(--primary);
}

.qr-code svg {
  width: 150px;
  height: 150px;
}

/* ========================================
   Contact Form
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-form {
  background: white;
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 4px 30px var(--shadow);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

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

.faq-item {
  background: white;
  border-radius: 16px;
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: 0 2px 10px var(--shadow);
}

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

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

.faq-icon {
  width: 30px;
  height: 30px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 24px 24px;
  max-height: 200px;
}

.faq-answer p {
  color: var(--text-light);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background: var(--secondary);
  color: white;
  padding: 60px 0 30px;
}

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

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

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

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 30px;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
}

/* ========================================
   Page Header
   ======================================== */
.page-header {
  padding: 140px 0 80px;
  background: var(--gradient-subtle);
  text-align: center;
}

.page-header h1 {
  margin-bottom: 16px;
}

.page-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.125rem;
}

/* ========================================
   Tabs
   ======================================== */
.tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 12px 24px;
  border-radius: 30px;
  background: white;
  color: var(--text);
  font-weight: 500;
  border: 2px solid var(--border);
  transition: all 0.3s ease;
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ========================================
   Tags
   ======================================== */
.tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  padding: 6px 14px;
  background: rgba(230, 57, 70, 0.1);
  color: var(--primary);
  border-radius: 20px;
  font-size: 0.85rem;
  transition: all 0.3s ease;
}

.tag:hover {
  background: var(--primary);
  color: white;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-15px);
  }
}

/* Scroll Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger Animation */
.stagger-item {
  opacity: 0;
  transform: translateY(20px);
}

.stagger-item.visible {
  animation: fadeInUp 0.5s ease forwards;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .hero-visual {
    order: -1;
  }

  .hero-image {
    max-width: 350px;
  }

  .floating-card {
    display: none;
  }

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

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

  .download-section {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 60px 40px;
  }

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

@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    gap: 10px;
    box-shadow: 0 10px 30px var(--shadow);
  }

  .nav.active {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .section {
    padding: 60px 0;
  }

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

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

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

  .download-buttons {
    flex-direction: column;
  }
}

/* ========================================
   Utilities
   ======================================== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.bg-primary { background: var(--primary); }
.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }