/* ============================================
   主样式表 - 短视频创作与算法优化传媒网站
   独特配色: 深紫 + 玫红 + 金色点缀
   移动优先响应式设计
   ============================================ */

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

:root {
  --color-primary: #9b1b5e;
  --color-primary-dark: #6d1342;
  --color-primary-light: #c94b8a;
  --color-secondary: #1a0a2e;
  --color-secondary-light: #2d1650;
  --color-accent: #e8a838;
  --color-accent-light: #f5c96a;
  --color-text: #f0e6f0;
  --color-text-muted: #b8a0c0;
  --color-bg: #0e0618;
  --color-bg-card: #1a0e30;
  --color-bg-card-hover: #251540;
  --color-border: #3a2060;
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --font-primary: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-heading: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --shadow-sm: 0 2px 8px rgba(155, 27, 94, 0.15);
  --shadow-md: 0 4px 20px rgba(155, 27, 94, 0.25);
  --shadow-lg: 0 8px 40px rgba(155, 27, 94, 0.35);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-accent-light);
}

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

h1 { font-size: 2rem; margin-bottom: 1rem; }
h2 { font-size: 1.65rem; margin-bottom: 0.85rem; }
h3 { font-size: 1.35rem; margin-bottom: 0.7rem; }
h4 { font-size: 1.15rem; margin-bottom: 0.6rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

/* ============ Layout Container ============ */
.site-container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ============ Header / Navigation (NOT sticky) ============ */
.site-header {
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-light) 100%);
  padding: 0.8rem 0;
  border-bottom: 2px solid var(--color-primary);
  position: relative;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.site-logo img {
  height: 40px;
  width: auto;
}

.site-logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 1px;
}

/* Mobile menu toggle */
.nav-toggle {
  display: block;
  background: none;
  border: 2px solid var(--color-primary-light);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  color: var(--color-text);
  font-size: 1.4rem;
  line-height: 1;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: var(--transition);
}

.main-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 0;
  background: var(--color-secondary);
  border-radius: var(--radius-md);
  margin-top: 0.5rem;
  overflow: hidden;
}

.main-nav.active {
  display: flex;
}

.main-nav a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.main-nav a:last-child {
  border-bottom: none;
}

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

.nav-cta {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff !important;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
  text-align: center;
  margin: 0.5rem 1rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  color: #fff !important;
}

/* ============ Hero Section ============ */
.hero-section {
  position: relative;
  overflow: hidden;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.4);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 6, 24, 0.6) 0%, rgba(14, 6, 24, 0.9) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero-content h1 {
  font-size: 2.2rem;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.hero-content p {
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.hero-video-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  max-width: 100%;
}

.hero-video-wrap video {
  width: 100%;
  max-width: 600px;
  display: block;
  border-radius: var(--radius-lg);
}

.play-btn-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition: background var(--transition);
  border-radius: var(--radius-lg);
}

.play-btn-overlay:hover {
  background: rgba(0, 0, 0, 0.15);
}

.play-btn-icon {
  width: 70px;
  height: 70px;
  background: rgba(155, 27, 94, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid rgba(255, 255, 255, 0.8);
  transition: transform var(--transition);
}

.play-btn-overlay:hover .play-btn-icon {
  transform: scale(1.15);
}

.play-btn-icon::after {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 14px 0 14px 24px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}

/* ============ Section Styles ============ */
.section {
  padding: 3rem 0;
}

.section-alt {
  background: linear-gradient(180deg, var(--color-secondary) 0%, var(--color-bg) 100%);
}

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

.section-title {
  text-align: center;
  margin-bottom: 2rem;
}

.section-title h2 {
  display: inline-block;
  position: relative;
  padding-bottom: 0.6rem;
}

.section-title h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
}

.section-title p {
  max-width: 600px;
  margin: 0.8rem auto 0;
  text-align: center;
}

/* ============ Video Cards Grid ============ */
.video-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.video-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.video-card-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.video-card:hover .video-card-thumb img {
  transform: scale(1.08);
}

.video-card-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
  background: rgba(0, 0, 0, 0.4);
}

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

.video-card-play-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-card-play-icon::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 8px 0 8px 14px;
  border-color: transparent transparent transparent #fff;
  margin-left: 2px;
}

.video-card-duration {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 3px;
}

.video-card-body {
  padding: 0.75rem;
}

.video-card-body h3 {
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-body p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.4rem;
}

/* ============ Rating Stars ============ */
.stars {
  color: var(--color-accent);
  font-size: 1rem;
  letter-spacing: 2px;
}

.stars-sm {
  font-size: 0.85rem;
}

/* ============ Creator Cards ============ */
.creator-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.creator-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: center;
  padding: 1.2rem 0.8rem;
  border: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

.creator-card:hover {
  border-color: var(--color-primary);
}

.creator-card-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 0.8rem;
  border: 3px solid var(--color-primary);
}

.creator-card h4 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.creator-card p {
  font-size: 0.85rem;
}

/* ============ Review Cards ============ */
.review-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.review-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  border-left: 4px solid var(--color-primary);
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.review-author {
  font-weight: 600;
  color: var(--color-text);
}

.review-location {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

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

/* ============ FAQ Accordion ============ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.2rem;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-primary);
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--color-bg-card-hover);
}

.faq-icon {
  font-size: 1.3rem;
  color: var(--color-accent);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 0.5rem;
}

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

.faq-answer {
  display: none;
  padding: 0 1.2rem 1rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-item.open .faq-answer {
  display: block;
}

/* ============ CTA / Consulting ============ */
.cta-box {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-secondary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  border: 1px solid var(--color-primary);
}

.cta-box h2 {
  color: var(--color-accent);
}

.cta-box p {
  color: var(--color-text);
  max-width: 500px;
  margin: 0.5rem auto 1.5rem;
}

.btn-primary {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: #fff;
}

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--color-accent);
  padding: 0.65rem 1.8rem;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid var(--color-accent);
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
}

/* ============ Payment Section ============ */
.payment-methods {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
  align-items: center;
}

.payment-badge {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
}

.payment-badge.pix-highlight {
  background: linear-gradient(135deg, #00a884, #008060);
  border-color: #00a884;
  color: #fff;
  font-size: 1rem;
  padding: 0.6rem 1.5rem;
}

/* ============ License Section ============ */
.license-section {
  text-align: center;
}

.license-badge-img {
  width: 120px;
  height: 120px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  border: 3px solid var(--color-accent);
}

/* ============ Support Section ============ */
.support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.support-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  text-align: center;
  border: 1px solid var(--color-border);
}

.support-card-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary-light);
}

/* ============ Breadcrumb ============ */
.breadcrumb {
  padding: 0.8rem 0;
  font-size: 0.85rem;
}

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

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

.breadcrumb span {
  color: var(--color-text-muted);
  margin: 0 0.3rem;
}

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

/* ============ Inner Page Content ============ */
.page-banner {
  position: relative;
  height: 200px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-banner img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.35);
}

.page-banner h1 {
  position: relative;
  z-index: 2;
  color: #fff;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.content-area {
  padding: 2rem 0;
}

.content-area article {
  max-width: 800px;
  margin: 0 auto;
}

.content-area article h2 {
  margin-top: 2rem;
  color: var(--color-accent);
}

.content-area article h3 {
  margin-top: 1.5rem;
  color: var(--color-primary-light);
}

.content-area article p {
  text-align: justify;
}

.content-area article img {
  border-radius: var(--radius-md);
  margin: 1rem 0;
  box-shadow: var(--shadow-sm);
}

/* ============ App Download Page ============ */
.app-hero {
  text-align: center;
  padding: 3rem 1rem;
  background: linear-gradient(180deg, var(--color-secondary) 0%, var(--color-bg) 100%);
}

.app-mockup-img {
  max-width: 280px;
  margin: 0 auto 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.download-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  align-items: center;
  margin-top: 1.5rem;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--color-bg-card);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 0.8rem 1.5rem;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  min-width: 220px;
  justify-content: center;
}

.download-btn:hover {
  background: var(--color-primary);
  color: #fff;
}

.qr-code-box {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 1rem;
  display: inline-block;
  margin-top: 1.5rem;
}

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

/* ============ Footer ============ */
.site-footer {
  background: var(--color-secondary);
  border-top: 2px solid var(--color-primary-dark);
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.footer-col h4 {
  color: var(--color-accent);
  margin-bottom: 0.8rem;
  font-size: 1rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.4rem;
}

.footer-col ul li a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-social {
  display: flex;
  gap: 0.8rem;
  margin-top: 0.5rem;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  text-align: center;
}

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

.footer-payment {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 0.8rem;
}

.footer-payment span {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

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

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

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px rgba(155, 27, 94, 0.3); }
  50% { box-shadow: 0 0 25px rgba(155, 27, 94, 0.6); }
}

.glow-effect {
  animation: pulse-glow 2s ease-in-out infinite;
}

/* ============ Responsive: Tablet ============ */
@media (min-width: 600px) {
  .site-container {
    padding: 0 1.5rem;
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }

  .hero-content h1 {
    font-size: 2.8rem;
  }

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

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

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

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

  .download-buttons {
    flex-direction: row;
    justify-content: center;
  }
}

/* ============ Responsive: Desktop ============ */
@media (min-width: 960px) {
  .site-container {
    padding: 0 2rem;
  }

  h1 { font-size: 3rem; }

  .hero-content h1 {
    font-size: 3.2rem;
  }

  .hero-section {
    min-height: 70vh;
  }

  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: flex !important;
    width: auto;
    flex-direction: row;
    background: none;
    margin-top: 0;
    gap: 0;
  }

  .main-nav a {
    padding: 0.5rem 0.8rem;
    border-bottom: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
  }

  .video-cards-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
  }

  .creator-cards {
    grid-template-columns: repeat(4, 1fr);
  }

  .support-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .section {
    padding: 4rem 0;
  }

  .page-banner {
    height: 300px;
  }
}

/* ============ Responsive: Large Desktop ============ */
@media (min-width: 1200px) {
  .video-cards-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ============ Utility Classes ============ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}