/* ============================================================
   六安德扑网 — 地方性德州扑克门户
   设计系统：SaaS风格 / 大留白 / 大圆角 / 微阴影
   ============================================================ */

:root {
  --primary: #4F46E5;
  --primary-dark: #3730A3;
  --primary-light: #818CF8;
  --accent: #F59E0B;
  --accent-dark: #D97706;
  --dark: #1E1B4B;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;
  --radius-sm: 0.5rem;
  --radius: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 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);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--gray-800);
  background: #fff;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========== Navbar ========== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 1rem 0;
  transition: all 0.3s ease;
  background: transparent;
}
.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-md);
  padding: 0.6rem 0;
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 0.6rem;
  text-decoration: none; font-weight: 800; font-size: 1.35rem;
  color: #fff; transition: color 0.3s;
}
.navbar.scrolled .nav-logo { color: var(--dark); }
.nav-logo i { font-size: 1.6rem; color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
.nav-links a {
  text-decoration: none; color: rgba(255,255,255,0.9);
  font-weight: 500; font-size: 0.95rem;
  transition: color 0.2s; position: relative;
}
.navbar.scrolled .nav-links a { color: var(--gray-700); }
.nav-links a:hover { color: var(--accent); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--accent); transition: width 0.3s; border-radius: 2px;
}
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  background: var(--accent); color: #fff !important;
  padding: 0.5rem 1.4rem; border-radius: 9999px;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.nav-cta::after { display: none !important; }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 4px; z-index: 1001;
}
.hamburger span {
  display: block; width: 26px; height: 2.5px; border-radius: 2px;
  background: #fff; transition: all 0.3s;
}
.navbar.scrolled .hamburger span { background: var(--dark); }
.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-nav {
  position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
  background: #fff; z-index: 999;
  padding: 5rem 2rem 2rem;
  transition: right 0.3s ease;
  box-shadow: var(--shadow-xl);
  display: flex; flex-direction: column; gap: 1rem;
}
.mobile-nav.open { right: 0; }
.mobile-nav a {
  display: block; padding: 0.8rem 1rem; text-decoration: none;
  color: var(--gray-700); font-weight: 500; font-size: 1.05rem;
  border-radius: var(--radius);
  transition: all 0.2s;
}
.mobile-nav a:hover { background: var(--gray-100); color: var(--primary); }
.mobile-nav .mobile-cta {
  background: var(--accent); color: #fff; text-align: center;
  font-weight: 600; margin-top: 0.5rem;
}
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 998;
  opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.overlay.show { opacity: 1; pointer-events: auto; }

/* ========== Hero ========== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  background: linear-gradient(135deg, #1E1B4B 0%, #3730A3 40%, #4F46E5 70%, #6366F1 100%);
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(245,158,11,0.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(129,140,248,0.12) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-container {
  max-width: 1200px; margin: 0 auto; padding: 6rem 2rem 4rem;
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem;
  align-items: center; position: relative; z-index: 1;
}
.hero-text h1 {
  font-size: 3.2rem; font-weight: 900; line-height: 1.2;
  color: #fff; margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}
.hero-text h1 span { color: var(--accent); }
.hero-text p {
  font-size: 1.15rem; color: rgba(255,255,255,0.8);
  line-height: 1.8; margin-bottom: 2.5rem; max-width: 500px;
}
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 2rem; border-radius: 9999px;
  font-weight: 600; font-size: 1rem; text-decoration: none;
  cursor: pointer; border: none; transition: all 0.3s;
}
.btn-primary {
  background: var(--accent); color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 10px 30px rgba(245,158,11,0.4); }
.btn-outline {
  background: transparent; color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.hero-img {
  display: flex; justify-content: center; align-items: center;
}
.hero-img img {
  width: 100%; max-width: 480px; border-radius: var(--radius-2xl);
  box-shadow: 0 30px 60px rgba(0,0,0,0.3);
  transform: perspective(800px) rotateY(-5deg);
  transition: transform 0.5s;
}
.hero-img img:hover { transform: perspective(800px) rotateY(0deg); }

/* ========== Section ========== */
.section { padding: 5rem 2rem; }
.section-container { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-label {
  display: inline-block; padding: 0.35rem 1.2rem;
  background: rgba(79,70,229,0.08); color: var(--primary);
  border-radius: 9999px; font-weight: 600; font-size: 0.85rem;
  margin-bottom: 1rem; letter-spacing: 0.05em;
}
.section-header h2 { font-size: 2.4rem; font-weight: 800; color: var(--gray-900); margin-bottom: 0.8rem; }
.section-header p { font-size: 1.05rem; color: var(--gray-500); max-width: 600px; margin: 0 auto; }

/* ========== Features ========== */
.features { background: var(--gray-50); }
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem;
}
.feature-card {
  background: #fff; border-radius: var(--radius-xl);
  padding: 2.2rem 2rem; text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.35s ease;
  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(--accent));
  transform: scaleX(0); transition: transform 0.35s;
  transform-origin: left;
}
.feature-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 1.3rem;
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(245,158,11,0.1));
  color: var(--primary);
  transition: all 0.35s;
}
.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; transform: scale(1.1);
}
.feature-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--gray-900); margin-bottom: 0.6rem; }
.feature-card p { font-size: 0.92rem; color: var(--gray-500); line-height: 1.7; }

/* ========== Stats ========== */
.stats {
  background: linear-gradient(135deg, var(--dark), var(--primary-dark));
  color: #fff; 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='0.03'%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: 2rem;
  text-align: center; position: relative; z-index: 1;
}
.stat-item h3 {
  font-size: 2.8rem; font-weight: 900; color: var(--accent); margin-bottom: 0.3rem;
}
.stat-item p { font-size: 0.95rem; color: rgba(255,255,255,0.7); font-weight: 500; }

/* ========== Testimonials ========== */
.testimonials { background: #fff; }
.testimonials-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem;
}
.testimonial-card {
  background: var(--gray-50); border-radius: var(--radius-xl);
  padding: 2rem; box-shadow: var(--shadow-sm);
  transition: all 0.3s; border: 1px solid var(--gray-200);
}
.testimonial-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.testimonial-stars { color: var(--accent); margin-bottom: 1rem; font-size: 0.9rem; }
.testimonial-text {
  font-size: 0.95rem; color: var(--gray-600); line-height: 1.8;
  margin-bottom: 1.3rem; font-style: italic;
}
.testimonial-author { display: flex; align-items: center; gap: 0.8rem; }
.testimonial-author img {
  width: 44px; height: 44px; border-radius: 50%; object-fit: cover;
}
.testimonial-author strong { font-size: 0.95rem; color: var(--gray-900); display: block; }
.testimonial-author span { font-size: 0.8rem; color: var(--gray-400); }

/* ========== FAQ ========== */
.faq { background: var(--gray-50); }
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 0.8rem; }
.faq-item {
  background: #fff; border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200); transition: all 0.3s;
}
.faq-item:hover { box-shadow: var(--shadow-md); }
.faq-question {
  width: 100%; padding: 1.3rem 1.5rem; display: flex; align-items: center;
  justify-content: space-between; background: none; border: none;
  cursor: pointer; font-weight: 600; font-size: 1rem; color: var(--gray-900);
  text-align: left;
}
.faq-question i { transition: transform 0.3s; color: var(--primary); font-size: 0.9rem; }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 1.5rem;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 1.5rem 1.3rem; }
.faq-answer p { font-size: 0.92rem; color: var(--gray-600); line-height: 1.8; }

/* ========== CTA ========== */
.cta-section {
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #A855F7 100%);
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; top: 0; right: 0; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-content {
  position: relative; z-index: 1; text-align: center; color: #fff;
}
.cta-content h2 { font-size: 2.2rem; font-weight: 800; margin-bottom: 0.8rem; }
.cta-content p { font-size: 1.05rem; color: rgba(255,255,255,0.8); margin-bottom: 2rem; }
.cta-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ========== Footer ========== */
.footer { background: var(--gray-900); color: rgba(255,255,255,0.7); padding: 3rem 2rem 1.5rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2.5rem; }
.footer-brand h3 { font-size: 1.3rem; color: #fff; margin-bottom: 0.8rem; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; }
.footer-links h4 { font-size: 1rem; color: #fff; margin-bottom: 1rem; font-weight: 600; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 0.5rem; }
.footer-links a { color: rgba(255,255,255,0.6); text-decoration: none; font-size: 0.88rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1.5rem; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.4);
}

/* ========== Page-specific ========== */
/* About */
.about-hero { padding-top: 8rem; background: linear-gradient(135deg, #1E1B4B, #3730A3); color: #fff; }
.about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.about-content img { width: 100%; border-radius: var(--radius-2xl); box-shadow: var(--shadow-xl); }
.about-text h2 { font-size: 2rem; font-weight: 800; margin-bottom: 1rem; }
.about-text p { font-size: 1rem; color: var(--gray-600); line-height: 1.8; margin-bottom: 1rem; }

/* Download */
.download-hero { padding-top: 8rem; background: linear-gradient(135deg, #1E1B4B, #3730A3); color: #fff; }
.download-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem; }
.download-card {
  background: #fff; border-radius: var(--radius-xl); padding: 2.2rem 2rem;
  text-align: center; box-shadow: var(--shadow); transition: all 0.3s;
}
.download-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.download-card i { font-size: 2.8rem; margin-bottom: 1rem; }
.download-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; }

/* Contact */
.contact-hero { padding-top: 8rem; background: linear-gradient(135deg, #1E1B4B, #3730A3); color: #fff; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 3rem; }
.contact-info-card {
  background: #fff; border-radius: var(--radius-xl); padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}
.contact-info-item { display: flex; gap: 1rem; margin-bottom: 1.8rem; }
.contact-info-item i {
  font-size: 1.3rem; color: var(--primary); margin-top: 2px;
}
.contact-form-card {
  background: #fff; border-radius: var(--radius-xl); padding: 2.5rem;
  box-shadow: var(--shadow-lg);
}
.form-group { margin-bottom: 1.3rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.4rem; color: var(--gray-700); font-size: 0.9rem; }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; padding: 0.75rem 1rem; border: 1.5px solid var(--gray-200);
  border-radius: var(--radius); font-size: 0.95rem; font-family: inherit;
  transition: border-color 0.3s, box-shadow 0.3s; 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);
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .hero-text h1 { font-size: 2.4rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .download-cards { 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-text p { margin: 0 auto 2rem; }
  .hero-btns { justify-content: center; }
  .hero-img { order: -1; }
  .hero-img img { max-width: 300px; transform: none; }
  .hero-img img:hover { transform: none; }
  .hero-text h1 { font-size: 2rem; }
  .features-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .about-content { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .download-cards { grid-template-columns: 1fr; }
  .section-header h2 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .hero-text h1 { font-size: 1.7rem; }
  .hero-container { padding: 5rem 1rem 3rem; }
  .section { padding: 3rem 1rem; }
}