/* ============================================================
   0067 — CRIMSON/RED FIERY DARK THEME — style.css
   ============================================================ */

/* --- CSS Variables / Root --- */
:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #1a1015;
  --bg-card: #1e1419;
  --bg-card-alt: #23171d;
  --text-primary: #f0e6e8;
  --text-secondary: #c4b0b6;
  --text-muted: #8a7078;
  --accent: #dc2626;
  --accent-light: #ef4444;
  --accent-dark: #b91c1c;
  --accent-glow: rgba(220, 38, 38, 0.25);
  --gradient-primary: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
  --gradient-hero: linear-gradient(180deg, #1a1015 0%, #0d0d0d 50%, #1a1015 100%);
  --gradient-card: linear-gradient(145deg, #1e1419 0%, #23171d 100%);
  --border-color: #2d1f25;
  --border-accent: #dc2626;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(220, 38, 38, 0.3);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-dark); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* --- Selection --- */
::selection { background: var(--accent); color: #fff; }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
}
.navbar-scrolled {
  background: rgba(13, 13, 13, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.6);
  border-bottom: 1px solid var(--border-color);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.navbar .logo {
  font-size: 1.5rem; font-weight: 800; color: var(--accent-light);
  text-decoration: none; letter-spacing: 1px;
  display: flex; align-items: center; gap: 8px;
}
.navbar .logo span { color: var(--text-primary); font-weight: 300; }
.navbar .nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.navbar .nav-links a {
  color: var(--text-secondary); text-decoration: none;
  font-size: 0.95rem; font-weight: 500; transition: color var(--transition);
  position: relative;
}
.navbar .nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--accent); transition: width var(--transition);
}
.navbar .nav-links a:hover { color: var(--accent-light); }
.navbar .nav-links a:hover::after { width: 100%; }
.navbar .hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 4px; z-index: 1001;
}
.navbar .hamburger span {
  display: block; width: 26px; height: 2px; background: var(--text-primary);
  border-radius: 2px; transition: all var(--transition);
}
.navbar .hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar .hamburger.active span:nth-child(2) { opacity: 0; }
.navbar .hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Mobile Menu --- */
.mobile-menu {
  position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
  background: var(--bg-secondary); z-index: 999;
  padding: 100px 32px 32px; transition: right var(--transition);
  display: flex; flex-direction: column; gap: 16px;
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.6);
}
.mobile-menu.active { right: 0; }
.mobile-menu a {
  color: var(--text-primary); text-decoration: none;
  font-size: 1.1rem; font-weight: 500; padding: 12px 0;
  border-bottom: 1px solid var(--border-color); transition: color var(--transition);
}
.mobile-menu a:hover { color: var(--accent-light); }
.mobile-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.6);
  z-index: 998; opacity: 0; pointer-events: none; transition: opacity var(--transition);
}
.mobile-overlay.active { opacity: 1; pointer-events: auto; }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px;
  background: var(--gradient-primary);
  color: #fff; font-weight: 600; font-size: 0.95rem;
  border: none; border-radius: var(--radius-md);
  cursor: pointer; text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(220, 38, 38, 0.5);
}
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px;
  background: transparent;
  color: var(--accent-light); font-weight: 600; font-size: 0.95rem;
  border: 2px solid var(--accent);
  border-radius: var(--radius-md);
  cursor: pointer; text-decoration: none;
  transition: all var(--transition);
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: var(--gradient-hero);
  overflow: hidden;
  padding: 120px 24px 80px;
}
.hero::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(220, 38, 38, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(185, 28, 28, 0.06) 0%, transparent 50%);
  animation: heroPulse 8s ease-in-out infinite;
}
@keyframes heroPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.hero .container {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  max-width: 1200px; margin: 0 auto;
}
.hero-content h1 {
  font-size: 3rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px;
  background: linear-gradient(135deg, #fca5a5 0%, #ef4444 50%, #dc2626 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 500px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-image img {
  width: 100%; max-width: 600px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 40px rgba(220, 38, 38, 0.15);
  transition: transform var(--transition);
}
.hero-image img:hover { transform: scale(1.02); }

/* ============================================================
   SECTION COMMON
   ============================================================ */
.section { padding: 100px 24px; }
.section .container { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 {
  font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; color: var(--text-primary);
}
.section-header p { color: var(--text-muted); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }
.section-header .accent-line {
  display: block; width: 60px; height: 3px; background: var(--accent);
  margin: 16px auto 0; border-radius: 2px;
}

/* ============================================================
   FEATURES
   ============================================================ */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-primary); transform: scaleX(0);
  transition: transform var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border-color: var(--border-accent);
}
.feature-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 64px; height: 64px; border-radius: var(--radius-md);
  background: rgba(220, 38, 38, 0.1);
  color: var(--accent-light); font-size: 1.6rem;
  margin-bottom: 20px; transition: all var(--transition);
}
.feature-card:hover .feature-icon {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px rgba(220, 38, 38, 0.4);
}
.feature-card h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; }
.feature-card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }

/* ============================================================
   STATS
   ============================================================ */
.stats-section { background: var(--bg-secondary); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stat-item { text-align: center; padding: 32px 20px; }
.stat-number {
  font-size: 3rem; font-weight: 800;
  background: linear-gradient(135deg, #fca5a5, #ef4444);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block; margin-bottom: 8px;
}
.stat-label { color: var(--text-muted); font-size: 0.95rem; font-weight: 500; }

/* ============================================================
   TESTIMONIALS
   ============================================================ */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.testimonial-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all var(--transition);
}
.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-accent);
}
.testimonial-card .stars { color: #f59e0b; margin-bottom: 16px; font-size: 0.9rem; }
.testimonial-card .text {
  color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7;
  margin-bottom: 20px; font-style: italic;
}
.testimonial-card .author { display: flex; align-items: center; gap: 12px; }
.testimonial-card .author img {
  width: 48px; height: 48px; border-radius: 50%; object-fit: cover;
  border: 2px solid var(--accent);
}
.testimonial-card .author .name { font-weight: 600; font-size: 0.9rem; }
.testimonial-card .author .role { color: var(--text-muted); font-size: 0.8rem; }

/* ============================================================
   FAQ ACCORDION
   ============================================================ */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:hover { border-color: var(--border-accent); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; cursor: pointer; user-select: none;
  font-weight: 600; font-size: 1rem; transition: color var(--transition);
}
.faq-question:hover { color: var(--accent-light); }
.faq-icon {
  font-size: 1.2rem; transition: transform var(--transition); color: var(--accent-light);
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease;
}
.faq-item.active .faq-answer { max-height: 400px; }
.faq-answer .answer-inner {
  padding: 0 24px 20px; color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7;
}

/* ============================================================
   CTA
   ============================================================ */
.cta-section {
  text-align: center; padding: 80px 24px;
  background: var(--gradient-primary);
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 { font-size: 2.2rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.cta-section p { color: rgba(255,255,255,0.85); font-size: 1.05rem; margin-bottom: 32px; }
.cta-section .btn-primary {
  background: #fff; color: var(--accent); box-shadow: var(--shadow-md); font-size: 1.05rem; padding: 14px 36px;
}
.cta-section .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,0.3); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border-color);
  padding: 60px 24px 30px;
}
.footer .container { max-width: 1200px; margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 16px; color: var(--text-primary); }
.footer-col p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.7; }
.footer-link {
  display: block; color: var(--text-muted); text-decoration: none;
  font-size: 0.9rem; padding: 6px 0; transition: color var(--transition);
}
.footer-link:hover { color: var(--accent-light); }
.footer-bottom {
  border-top: 1px solid var(--border-color); padding-top: 24px;
  text-align: center; color: var(--text-muted); font-size: 0.85rem;
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; z-index: 900;
  width: 44px; height: 44px;
  background: var(--accent); color: #fff; border: none;
  border-radius: 50%; cursor: pointer; font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(20px); pointer-events: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
}
.back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--accent-dark); transform: translateY(-3px); }

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.animate-on-scroll {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   CARD HOVER
   ============================================================ */
.card-hover {
  transition: all var(--transition);
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-hero { padding: 160px 24px 80px; text-align: center; background: var(--gradient-hero); }
.about-hero h1 { font-size: 2.8rem; font-weight: 800; color: var(--accent-light); margin-bottom: 12px; }
.about-hero p { color: var(--text-muted); font-size: 1.1rem; }
.about-story { padding: 80px 24px; }
.about-story .container { max-width: 900px; margin: 0 auto; }
.about-story h2 { font-size: 1.8rem; margin-bottom: 20px; color: var(--text-primary); }
.about-story p { color: var(--text-secondary); font-size: 1rem; line-height: 1.8; margin-bottom: 16px; }
.timeline { padding: 80px 24px; background: var(--bg-secondary); }
.timeline .container { max-width: 800px; margin: 0 auto; }
.timeline-item { display: flex; gap: 20px; margin-bottom: 40px; position: relative; }
.timeline-item::before {
  content: ''; position: absolute; left: 27px; top: 50px; bottom: -40px;
  width: 2px; background: var(--border-color);
}
.timeline-item:last-child::before { display: none; }
.timeline-year {
  flex-shrink: 0; width: 56px; height: 56px;
  background: var(--accent); color: #fff; font-weight: 700; font-size: 0.85rem;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  z-index: 1;
}
.timeline-content h3 { font-size: 1.15rem; margin-bottom: 6px; }
.timeline-content p { color: var(--text-muted); font-size: 0.9rem; }
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; padding: 80px 24px; }
.value-card {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 32px 24px; text-align: center;
  transition: all var(--transition);
}
.value-card:hover { transform: translateY(-4px); border-color: var(--border-accent); }
.value-card .value-icon { font-size: 2rem; color: var(--accent-light); margin-bottom: 16px; }
.value-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.value-card p { color: var(--text-muted); font-size: 0.9rem; }

/* ============================================================
   DOWNLOAD PAGE
   ============================================================ */
.download-hero { padding: 160px 24px 80px; text-align: center; background: var(--gradient-hero); }
.download-hero h1 { font-size: 2.8rem; font-weight: 800; color: var(--accent-light); margin-bottom: 12px; }
.download-hero p { color: var(--text-muted); font-size: 1.1rem; }
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; padding: 80px 24px; }
.download-card {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 40px 28px; text-align: center;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.download-card.featured { border-color: var(--accent); }
.download-card.featured::after {
  content: '推荐'; position: absolute; top: 16px; right: -30px;
  background: var(--accent); color: #fff; font-size: 0.75rem; font-weight: 600;
  padding: 4px 36px; transform: rotate(45deg);
}
.download-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--border-accent); }
.download-card .platform-icon { font-size: 3rem; color: var(--accent-light); margin-bottom: 16px; }
.download-card h3 { font-size: 1.3rem; margin-bottom: 8px; }
.download-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 20px; }
.download-info { padding: 60px 24px; background: var(--bg-secondary); }
.download-info .container { max-width: 800px; margin: 0 auto; }
.download-info h3 { font-size: 1.3rem; margin-bottom: 12px; color: var(--text-primary); }
.download-info ol { color: var(--text-secondary); padding-left: 20px; }
.download-info ol li { margin-bottom: 8px; line-height: 1.6; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content p { max-width: 100%; }
  .hero-buttons { justify-content: center; }
  .hero-image { order: -1; }
  .hero-image img { max-width: 400px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .download-grid { grid-template-columns: repeat(2, 1fr); }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .navbar .nav-links { display: none; }
  .navbar .hamburger { display: flex; }
  .hero-content h1 { font-size: 2.2rem; }
  .section-header h2 { font-size: 1.8rem; }
  .features-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-number { font-size: 2.2rem; }
}
@media (max-width: 375px) {
  .hero { padding: 100px 16px 60px; }
  .section { padding: 60px 16px; }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn-primary, .hero-buttons .btn-outline { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr; }
}