/* ===== Project 0011: 德扑圈 - Custom Styles ===== */

:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #6366f1;
  --primary-bg: #eef2ff;
  --accent: #f59e0b;
  --dark: #1e293b;
  --gray: #64748b;
  --light: #f8fafc;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow); }
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.logo i { font-size: 1.6rem; }
.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a {
  text-decoration: none;
  color: var(--dark);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--primary); }
.nav-links a.active::after { width: 100%; }
.nav-cta {
  background: var(--primary);
  color: var(--white) !important;
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }
.nav-cta::after { display: none !important; }

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--dark);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile Nav */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
  text-decoration: none;
  color: var(--dark);
  font-size: 1.3rem;
  font-weight: 600;
  transition: var(--transition);
}
.mobile-menu a:hover { color: var(--primary); }

/* ===== Hero ===== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 30%, #faf5ff 70%, #fdf2f8 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99,102,241,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--dark);
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.15rem;
  color: var(--gray);
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(79,70,229,0.35);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(79,70,229,0.4); }
.btn-outline {
  background: var(--white);
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--white); transform: translateY(-2px); }
.btn-accent {
  background: var(--accent);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(245,158,11,0.35);
}
.btn-accent:hover { background: #d97706; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(245,158,11,0.4); }
.hero-image {
  position: relative;
  display: flex;
  justify-content: center;
}
.hero-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  transform: perspective(1000px) rotateY(-3deg);
  transition: var(--transition);
}
.hero-image img:hover { transform: perspective(1000px) rotateY(0deg); }

/* Floating badges */
.hero-badge {
  position: absolute;
  background: var(--white);
  padding: 12px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-badge i { color: var(--accent); }
.hero-badge.top { top: -10px; right: -20px; }
.hero-badge.bottom { bottom: 30px; left: -30px; }

/* ===== Section Common ===== */
.section { padding: 90px 0; }
.section-header {
  text-align: center;
  margin-bottom: 60px;
}
.section-label {
  display: inline-block;
  background: var(--primary-bg);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.section-header h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}
.section-header p {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Features ===== */
.features { background: var(--light); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--white);
  padding: 40px 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-align: center;
  border: 1px solid rgba(0,0,0,0.04);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-8px) scale(1.02); box-shadow: var(--shadow-xl); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 72px;
  height: 72px;
  background: var(--primary-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 22px;
  font-size: 1.8rem;
  color: var(--primary);
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  background: var(--primary);
  color: var(--white);
  transform: scale(1.1);
}
.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--dark);
}
.feature-card p { color: var(--gray); font-size: 0.95rem; line-height: 1.7; }

/* ===== Stats ===== */
.stats {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  padding: 70px 0;
  position: relative;
  overflow: hidden;
}
.stats::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");
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.stat-item { padding: 20px; }
.stat-number {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -1px;
}
.stat-label { font-size: 1rem; opacity: 0.85; font-weight: 500; }

/* ===== Testimonials ===== */
.testimonials { background: var(--white); }
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.testimonial-card {
  background: var(--light);
  padding: 32px 28px;
  border-radius: var(--radius);
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.04);
}
.testimonial-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); background: var(--white); }
.testimonial-stars { color: var(--accent); margin-bottom: 14px; font-size: 0.9rem; }
.testimonial-text {
  color: var(--dark);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-author img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}
.testimonial-author h4 { font-size: 0.95rem; font-weight: 700; color: var(--dark); }
.testimonial-author span { font-size: 0.8rem; color: var(--gray); }

/* ===== FAQ ===== */
.faq { background: var(--light); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--white);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0,0,0,0.05);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow); }
.faq-question {
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--dark);
  user-select: none;
  transition: var(--transition);
}
.faq-question:hover { color: var(--primary); }
.faq-question i { transition: var(--transition); color: var(--gray); font-size: 0.85rem; }
.faq-item.active .faq-question { color: var(--primary); }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease;
}
.faq-item.active .faq-answer { max-height: 300px; }
.faq-answer p {
  padding: 0 28px 22px;
  color: var(--gray);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: linear-gradient(135deg, #312e81, #4f46e5);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.05) 0%, transparent 50%);
}
.cta-banner .container { position: relative; z-index: 1; }
.cta-banner h2 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}
.cta-banner p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.cta-banner .btn { font-size: 1.1rem; padding: 16px 40px; }

/* ===== Footer ===== */
.footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  color: var(--white);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 20px;
}
.footer-col p { font-size: 0.9rem; line-height: 1.8; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
}

/* ===== About Page ===== */
.about-hero { padding: 140px 0 60px; text-align: center; background: linear-gradient(135deg, #eef2ff, #faf5ff); }
.about-hero h1 { font-size: 2.8rem; font-weight: 800; color: var(--dark); margin-bottom: 16px; }
.about-hero p { color: var(--gray); font-size: 1.1rem; max-width: 700px; margin: 0 auto; }
.about-content { padding: 60px 0 80px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 2rem; font-weight: 700; color: var(--dark); margin-bottom: 20px; }
.about-text p { color: var(--gray); line-height: 1.9; margin-bottom: 16px; }
.about-image img { width: 100%; border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); }
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 60px; }
.value-card {
  background: var(--light);
  padding: 30px;
  border-radius: var(--radius);
  text-align: center;
  transition: var(--transition);
}
.value-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.value-card i { font-size: 2rem; color: var(--primary); margin-bottom: 14px; }
.value-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }

/* ===== Download Page ===== */
.download-hero { padding: 140px 0 60px; text-align: center; background: linear-gradient(135deg, #eef2ff, #faf5ff); }
.download-hero h1 { font-size: 2.8rem; font-weight: 800; }
.download-cards { padding: 40px 0 80px; }
.download-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.download-card {
  background: var(--white);
  padding: 44px 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
  border: 2px solid transparent;
}
.download-card:hover { border-color: var(--primary); transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.download-card i { font-size: 3rem; margin-bottom: 20px; }
.download-card i.apple { color: #1d1d1f; }
.download-card i.android { color: #3ddc84; }
.download-card h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 10px; }
.download-card p { color: var(--gray); margin-bottom: 24px; }
.download-note { text-align: center; padding: 20px 0 60px; }
.download-note .note-box {
  display: inline-block;
  background: #fef3c7;
  color: #92400e;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 500;
}

/* ===== Contact Page ===== */
.contact-hero { padding: 140px 0 60px; text-align: center; background: linear-gradient(135deg, #eef2ff, #faf5ff); }
.contact-hero h1 { font-size: 2.8rem; font-weight: 800; }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 50px;
  padding: 40px 0 80px;
}
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--light);
  border-radius: var(--radius);
  transition: var(--transition);
}
.contact-info-item:hover { background: var(--white); box-shadow: var(--shadow); }
.contact-info-item i {
  font-size: 1.5rem;
  color: var(--primary);
  margin-top: 2px;
}
.contact-info-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.contact-info-item p { color: var(--gray); font-size: 0.9rem; }
.contact-form {
  background: var(--white);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--dark);
  font-size: 0.9rem;
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  transition: var(--transition);
  font-family: inherit;
  outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-content h1 { font-size: 2.5rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content h1 { font-size: 2rem; }
  .hero-image { order: -1; }
  .hero-image img { max-width: 80%; }
  .hero-buttons { justify-content: center; }
  .hero-badge { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-number { font-size: 2.2rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .section-header h2 { font-size: 1.8rem; }
  .cta-banner h2 { font-size: 2rem; }
  .about-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .download-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero { padding: 120px 0 50px; }
  .hero-content h1 { font-size: 1.7rem; }
  .stats-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }
  .btn { padding: 12px 24px; font-size: 0.9rem; }
}