/* 开元棋牌官方网站 style.css */
:root {
  --primary: #1a1a2e;
  --secondary: #16213e;
  --accent: #ffd700;
  --accent2: #e6b800;
  --bg: #f8f9fa;
  --text: #2d3436;
  --glass: rgba(255,255,255,0.15);
  --shadow: 0 8px 32px rgba(0,0,0,0.12);
  --radius: 16px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}
[data-theme="dark"] {
  --primary: #0f0f1a;
  --secondary: #1a1a2e;
  --bg: #121212;
  --text: #e0e0e0;
  --glass: rgba(255,255,255,0.05);
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.glass {
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
}
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #1a1a2e;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(255,215,0,0.4);
}
.section {
  padding: 80px 0;
}
.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--accent), #fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-sub {
  font-size: 1.1rem;
  color: #636e72;
  max-width: 600px;
  margin-bottom: 48px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.card {
  background: var(--glass);
  backdrop-filter: blur(16px);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow);
}
.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 48px rgba(0,0,0,0.18);
}
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.number {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), #fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(26,26,46,0.9);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.5px;
}
nav {
  display: flex;
  gap: 32px;
  align-items: center;
}
nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}
nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}
nav a:hover::after,
nav a.active::after {
  width: 100%;
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}
.menu-toggle span {
  width: 28px;
  height: 2px;
  background: #fff;
  border-radius: 4px;
  transition: var(--transition);
}
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--secondary), #0f3460);
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg svg {
  width: 100%;
  height: 100%;
  opacity: 0.08;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  max-width: 800px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}
.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 24px;
  text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero .btn {
  font-size: 1.1rem;
  padding: 16px 48px;
}
.banner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}
.banner-slide {
  display: none;
  animation: slideIn 0.6s ease;
}
.banner-slide.active {
  display: block;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}
.banner-dots {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: var(--transition);
}
.dot.active {
  background: var(--accent);
  transform: scale(1.3);
}
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.about-text p {
  margin-bottom: 20px;
  font-size: 1.05rem;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px;
  text-align: center;
}
.stat-item {
  padding: 24px;
  background: var(--glass);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
}
.faq-item {
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  background: none;
  border: none;
  color: var(--text);
  width: 100%;
  text-align: left;
  padding: 8px 0;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  padding-left: 8px;
  color: #636e72;
}
.faq-answer.open {
  max-height: 400px;
  padding-top: 12px;
}
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #1a1a2e;
  border: none;
  cursor: pointer;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(255,215,0,0.3);
  transition: var(--transition);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  transform: translateY(-4px);
}
.dark-toggle {
  position: fixed;
  bottom: 32px;
  left: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--glass);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text);
  cursor: pointer;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: var(--transition);
}
.dark-toggle:hover {
  transform: scale(1.1);
}
footer {
  background: var(--primary);
  color: rgba(255,255,255,0.8);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 40px;
}
.footer-grid h4 {
  color: var(--accent);
  margin-bottom: 16px;
  font-size: 1.1rem;
}
.footer-grid a {
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
  transition: var(--transition);
}
.footer-grid a:hover {
  color: var(--accent);
}
.copyright {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.9rem;
}
.search-box {
  display: flex;
  gap: 8px;
  max-width: 400px;
  margin: 0 auto 48px;
}
.search-box input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 50px;
  border: 1px solid rgba(255,255,255,0.1);
  background: var(--glass);
  backdrop-filter: blur(8px);
  color: var(--text);
  font-size: 1rem;
  outline: none;
}
.search-box input::placeholder {
  color: #636e72;
}
.search-box button {
  padding: 14px 28px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  color: #1a1a2e;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(26,26,46,0.98);
  backdrop-filter: blur(24px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.mobile-menu.open {
  display: flex;
}
.mobile-menu a {
  color: #fff;
  font-size: 1.5rem;
  text-decoration: none;
  font-weight: 500;
}
.mobile-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .section-title { font-size: 2rem; }
  .about-content { grid-template-columns: 1fr; }
  nav { display: none; }
  .menu-toggle { display: flex; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .container { padding: 0 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}