/* ===== 全局重置与基础 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #1a1a2e;
  --secondary: #16213e;
  --accent: #f5c518;
  --accent-hover: #e0b014;
  --bg: #0f0f23;
  --bg-card: #1e1e3a;
  --text: #e0e0e0;
  --text-muted: #a0a0b8;
  --border: #2a2a4a;
  --shadow: 0 4px 20px rgba(0,0,0,.3);
  --radius: 12px;
  --transition: .3s ease;
  --glass-bg: rgba(30, 30, 58, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --gradient-banner: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f0f23 100%);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245,197,24,.3);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
}

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

/* ===== 通用区块 ===== */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 12px;
  color: #fff;
}

.section-subtitle {
  color: var(--text-muted);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,.4);
}

/* ===== 网格布局 ===== */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 30px;
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 24px;
}

@media (max-width: 992px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 576px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 50px 0;
  }
  .section-title {
    font-size: 1.6rem;
  }
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(15,15,35,.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition);
}

.header.scrolled {
  background: rgba(15,15,35,.98);
  box-shadow: 0 2px 20px rgba(0,0,0,.5);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.logo svg {
  width: 36px;
  height: 36px;
  transition: transform var(--transition);
}

.logo:hover svg {
  transform: rotate(10deg) scale(1.05);
}

.nav {
  display: flex;
  gap: 30px;
  list-style: none;
}

.nav a {
  color: var(--text);
  font-size: .95rem;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.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: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--bg);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    transform: translateY(-120%);
    transition: transform .4s ease;
    z-index: 999;
    border-bottom: 1px solid var(--border);
  }
  .nav.open {
    transform: translateY(0);
  }
  .menu-toggle {
    display: flex;
  }
  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px,5px);
  }
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px,-5px);
  }
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  background: var(--gradient-banner);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(245,197,24,.08) 0%, transparent 50%);
  pointer-events: none;
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(5%, 5%) scale(1.1); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  animation: fadeInUp 1s ease;
}

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

.hero h1 {
  font-size: 3.2rem;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #fff;
}

.hero h1 span {
  color: var(--accent);
  text-shadow: 0 0 20px rgba(245,197,24,.3);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 30px;
  max-width: 550px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1rem; }
}

/* ===== About ===== */
.about {
  background: var(--primary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

@media (max-width: 768px) {
  .about-content { grid-template-columns: 1fr; }
}

.about-text h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: #fff;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--text-muted);
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}

.stat-item {
  text-align: center;
  padding: 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stat-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,.3);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.stat-label {
  color: var(--text-muted);
  font-size: .9rem;
  margin-top: 4px;
}

/* ===== Products ===== */
.products {
  background: var(--secondary);
}

.product-card {
  text-align: center;
  padding: 40px 30px;
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .5s ease;
}

.product-card:hover::before {
  transform: scaleX(1);
}

.product-card .icon {
  margin-bottom: 16px;
  transition: transform var(--transition);
}

.product-card:hover .icon {
  transform: scale(1.1) rotate(5deg);
}

.product-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: #fff;
}

.product-card p {
  color: var(--text-muted);
  font-size: .95rem;
}

/* ===== Advantages ===== */
.advantages {
  background: var(--primary);
}

.advantage-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.advantage-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,.3);
}

.advantage-item .icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: rgba(245,197,24,.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.5rem;
  transition: transform var(--transition);
}

.advantage-item:hover .icon {
  transform: scale(1.15);
}

.advantage-item h4 {
  color: #fff;
  margin-bottom: 6px;
}

.advantage-item p {
  color: var(--text-muted);
  font-size: .9rem;
}

/* ===== Testimonials ===== */
.testimonials {
  background: var(--secondary);
}

.testimonial-card {
  padding: 30px;
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
}

.testimonial-card::before {
  content: '"';
  font-size: 4rem;
  color: var(--accent);
  opacity: .3;
  position: absolute;
  top: 10px;
  left: 20px;
  font-family: Georgia, serif;
}

.testimonial-card p {
  font-style: italic;
  color: var(--text);
  margin-bottom: 16px;
  padding-top: 20px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-author img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--border);
}

.testimonial-author strong {
  color: #fff;
  font-size: .95rem;
}

.testimonial-author span {
  color: var(--text-muted);
  font-size: .85rem;
}

/* ===== FAQ ===== */
.faq {
  background: var(--primary);
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  transition: background var(--transition);
}

.faq-item:hover {
  background: rgba(255,255,255,.02);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 500;
  color: #fff;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  padding: 8px 0;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--accent);
}

.faq-question .icon {
  transition: transform var(--transition);
  font-size: 1.2rem;
  color: var(--accent);
}

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

.faq-answer {
  padding: 0 0 12px 0;
  color: var(--text-muted);
  line-height: 1.7;
  display: none;
  animation: slideDown .3s ease;
}

@keyframes slideDown {
  from { opacity: 0; max-height: 0; }
  to { opacity: 1; max-height: 500px; }
}

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

/* ===== HowTo ===== */
.howto {
  background: var(--secondary);
}

.howto-step {
  display: flex;
  gap: 24px;
  margin-bottom: 30px;
  align-items: flex-start;
  transition: transform var(--transition);
}

.howto-step:hover {
  transform: translateX(8px);
}

.howto-step .step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.howto-step:hover .step-num {
  transform: scale(1.1);
}

.howto-step h4 {
  color: #fff;
  margin-bottom: 6px;
}

.howto-step p {
  color: var(--text-muted);
  font-size: .95rem;
}

/* ===== Contact ===== */
.contact {
  background: var(--primary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-info p {
  margin-bottom: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.contact-info strong {
  color: #fff;
}

.contact-info p:hover {
  color: var(--text);
}

/* ===== Footer ===== */
.footer {
  background: var(--secondary);
  border-top: 1px solid var(--border);
  padding: 50px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 576px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer h4 {
  color: #fff;
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.footer p,
.footer a {
  color: var(--text-muted);
  font-size: .9rem;
  display: block;
  margin-bottom: 8px;
  transition: color var(--transition);
}

.footer a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .85rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-muted);
  display: inline;
  margin: 0 8px;
}

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

/* ===== Back to top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--primary);
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 4px 15px rgba(245,197,24,.3);
  transition: all var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  display: flex;
  animation: bounceIn .5s ease;
}

@keyframes bounceIn {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); opacity: 1; }
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(245,197,24,.4);
}

/* ===== Dark mode toggle ===== */
.dark-toggle {
  background: none;
  border: 2px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition);
}

.dark-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(30deg);
}

/* ===== Search box ===== */
.search-box {
  display: flex;
  gap: 8px;
  max-width: 400px;
  margin: 0 auto 40px;
}

.search-box input {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 1rem;
  outline: none;
  transition: border var(--transition);
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(245,197,24,.1);
}

.search-box button {
  padding: 12px 20px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--primary);
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background var(--transition);
}

.search-box button:hover {
  background: var(--accent-hover);
}

/* ===== Banner carousel ===== */
.banner-carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 40px;
  background: var(--bg-card);
}

.banner-slide {
  display: none;
  padding: 60px 40px;
  min-height: 300px;
  align-items: center;
  background: var(--gradient-banner);
  animation: fadeIn .5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.banner-slide.active {
  display: flex;
}

.banner-slide h3 {
  font-size: 1.8rem;
  color: #fff;
  margin-bottom: 12px;
}

.banner-slide p {
  color: var(--text-muted);
  margin-bottom: 20px;
  max-width: 500px;
}

.banner-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 16px 0;
}

.banner-dots button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
}

.banner-dots button.active {
  background: var(--accent);
  transform: scale(1.2);
}

/* ===== Article cards ===== */
.article-card {
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .5s ease;
}

.article-card:hover::after {
  transform: scaleX(1);
}

.article-card .date {
  color: var(--text-muted);
  font-size: .85rem;
  margin-bottom: 8px;
}

.article-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: #fff;
}

.article-card p {
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 16px;
}

.article-card .read-more {
  color: var(--accent);
  font-weight: 500;
  font-size: .9rem;
  transition: gap .3s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-card .read-more:hover {
  gap: 8px;
}

/* ===== Scroll highlight ===== */
.nav a.active-link {
  color: var(--accent);
}

.nav a.active-link::after {
  width: 100%;
}

/* ===== 滚动动画 ===== */
@media (prefers-reduced-motion: no-preference) {
  .scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity .6s ease, transform .6s ease;
  }
  .scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 毛玻璃效果增强 ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
}