/* ============================================
   LEYU乐鱼官网 - 综合体育娱乐平台入口
   style.css - 完整样式表
   ============================================ */

/* ===== CSS Variables & Theme ===== */
:root {
  --primary: #1a1f36;
  --primary-light: #2a2f46;
  --accent: #f0b429;
  --accent-light: #f7d44a;
  --accent-dark: #d49a1a;
  --text: #e8e8f0;
  --text-secondary: #a0a4b8;
  --bg: #0d0f1a;
  --bg-card: rgba(26, 31, 54, 0.75);
  --bg-glass: rgba(26, 31, 54, 0.4);
  --border: rgba(240, 180, 41, 0.15);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(240, 180, 41, 0.1);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --header-height: 64px;
}

/* Light theme variables */
[data-theme="light"] {
  --primary: #ffffff;
  --primary-light: #f5f7fa;
  --accent: #d49a1a;
  --accent-light: #f0b429;
  --accent-dark: #b8860b;
  --text: #1a1f36;
  --text-secondary: #5a5e72;
  --bg: #f0f2f5;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-glass: rgba(255, 255, 255, 0.5);
  --border: rgba(26, 31, 54, 0.1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 25px rgba(212, 154, 26, 0.1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

img, svg {
  max-width: 100%;
  display: block;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-dark);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ===== Header & Navigation ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--transition), border var(--transition);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  gap: 20px;
}

nav a[aria-label="LEYU乐鱼首页"] {
  flex-shrink: 0;
  transition: transform var(--transition);
}

nav a[aria-label="LEYU乐鱼首页"]:hover {
  transform: scale(1.05);
}

nav ul {
  display: flex;
  gap: 8px;
  align-items: center;
  flex: 1;
  justify-content: center;
}

nav ul li a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition);
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: transform var(--transition);
}

nav ul li a:hover,
nav ul li a[aria-current="page"] {
  color: var(--accent);
  background: rgba(240, 180, 41, 0.08);
}

nav ul li a:hover::after,
nav ul li a[aria-current="page"]::after {
  transform: translateX(-50%) scaleX(1);
}

nav button {
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  color: var(--text-secondary);
  flex-shrink: 0;
}

nav button:hover {
  background: rgba(240, 180, 41, 0.1);
  color: var(--accent);
}

#menuToggle {
  display: none;
  font-size: 1.5rem;
}

/* ===== Hero Section ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 80px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0d0f1a 0%, #1a1f36 40%, #2a1f1a 70%, #0d0f1a 100%);
}

[data-theme="light"] #hero {
  background: linear-gradient(135deg, #e8ecf1 0%, #d4d9e6 40%, #e6d4c4 70%, #e8ecf1 100%);
}

#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(240, 180, 41, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(240, 180, 41, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

#hero > div {
  position: relative;
  z-index: 1;
  max-width: 800px;
  animation: fadeInUp 1s ease-out;
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

#hero p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

#hero a[role="button"] {
  display: inline-block;
  padding: 16px 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--primary);
  font-weight: 700;
  font-size: 1.05rem;
  border-radius: 50px;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(240, 180, 41, 0.3);
  border: none;
  cursor: pointer;
}

#hero a[role="button"]:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(240, 180, 41, 0.4);
}

/* ===== Section Common ===== */
section {
  padding: 80px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

section h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  position: relative;
  color: var(--text);
}

section h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  margin: 12px auto 0;
  border-radius: 2px;
}

/* ===== About Section ===== */
#about p {
  max-width: 800px;
  margin: 0 auto 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1rem;
}

#about p:last-of-type {
  margin-top: 24px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* ===== Products Section (Cards) ===== */
#products > div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

#products article {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: all var(--transition);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

#products article::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  opacity: 0;
  transition: opacity var(--transition);
}

#products article:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow), var(--shadow);
  border-color: var(--accent);
}

#products article:hover::before {
  opacity: 1;
}

#products article h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--accent);
}

#products article p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ===== Services & Advantages (List Styling) ===== */
#services ul,
#advantages ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}

#services ul li,
#advantages ul li {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  transition: all var(--transition);
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.6;
}

#services ul li:hover,
#advantages ul li:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

#services ul li strong,
#advantages ul li strong {
  color: var(--accent);
  display: block;
  margin-bottom: 4px;
  font-size: 1rem;
}

/* ===== Testimonials ===== */
#testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

#testimonials blockquote {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  transition: all var(--transition);
}

#testimonials blockquote::before {
  content: '"';
  font-size: 4rem;
  position: absolute;
  top: 8px;
  left: 16px;
  color: var(--accent);
  opacity: 0.2;
  font-family: Georgia, serif;
  line-height: 1;
}

#testimonials blockquote:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

#testimonials blockquote p {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 16px;
  padding-left: 24px;
}

#testimonials blockquote cite {
  font-style: normal;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ===== Case Studies ===== */
#case-studies {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

#case-studies article {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}

#case-studies article:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

#case-studies article h3 {
  color: var(--accent);
  margin-bottom: 12px;
  font-size: 1.15rem;
}

#case-studies article p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Insights (Blog) ===== */
#insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

#insights article {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

#insights article:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

#insights article h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--text);
  line-height: 1.4;
}

#insights article p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 12px;
}

#insights article time {
  font-size: 0.85rem;
  color: var(--text-secondary);
  opacity: 0.7;
  margin-bottom: 8px;
}

#insights article a {
  align-self: flex-start;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
  position: relative;
  padding-right: 20px;
}

#insights article a::after {
  content: '→';
  position: absolute;
  right: 0;
  transition: transform var(--transition);
}

#insights article a:hover::after {
  transform: translateX(4px);
}

/* ===== FAQ (Accordion) ===== */
#faq {
  max-width: 800px;
  margin: 0 auto;
  padding: 80px 20px;
}

#faq details {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}

#faq details:hover {
  border-color: var(--accent);
}

#faq details[open] {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

#faq summary {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text);
  transition: color var(--transition);
  list-style: none;
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent);
  transition: transform var(--transition);
  font-weight: 300;
  line-height: 1;
}

#faq details[open] summary::after {
  transform: rotate(45deg);
}

#faq details p {
  padding: 0 24px 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

/* ===== HowTo Section ===== */
#howto ol {
  max-width: 700px;
  margin: 0 auto;
  counter-reset: step;
}

#howto ol li {
  counter-increment: step;
  padding: 16px 20px 16px 60px;
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  transition: all var(--transition);
  color: var(--text-secondary);
  line-height: 1.6;
}

#howto ol li:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

#howto ol li strong {
  color: var(--accent);
  display: block;
  margin-bottom: 2px;
}

/* ===== Contact Section ===== */
#contact ul {
  max-width: 600px;
  margin: 24px auto 0;
  display: grid;
  gap: 12px;
}

#contact ul li {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 24px;
  transition: all var(--transition);
  color: var(--text-secondary);
}

#contact ul li:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

#contact ul li strong {
  color: var(--accent);
  margin-right: 8px;
}

#contact ul li a {
  color: var(--accent);
}

#contact ul li a:hover {
  text-decoration: underline;
}

/* ===== Footer ===== */
footer {
  background: var(--primary);
  border-top: 1px solid var(--border);
  padding: 40px 20px 24px;
  text-align: center;
}

footer nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 24px;
}

footer nav ul li a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition);
}

footer nav ul li a:hover {
  color: var(--accent);
}

footer p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  opacity: 0.7;
  margin-bottom: 4px;
}

/* ===== Back to Top Button ===== */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--primary);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(240, 180, 41, 0.3);
  transition: all var(--transition);
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

#backToTop.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#backToTop:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(240, 180, 41, 0.4);
}

/* ===== Scroll Animation Classes ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
  section {
    padding: 60px 20px;
  }

  nav ul {
    gap: 4px;
  }

  nav ul li a {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  nav ul {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }

  nav ul.open {
    display: flex;
  }

  nav ul li a {
    padding: 12px 16px;
    font-size: 1rem;
    width: 100%;
    text-align: center;
  }

  #menuToggle {
    display: flex;
  }

  #hero {
    padding: 100px 20px 60px;
    min-height: 80vh;
  }

  #hero h1 {
    font-size: clamp(1.6rem, 6vw, 2.4rem);
  }

  section {
    padding: 48px 16px;
  }

  section h2 {
    font-size: 1.4rem;
    margin-bottom: 28px;
  }

  #products > div,
  #services ul,
  #advantages ul {
    grid-template-columns: 1fr;
  }

  #testimonials,
  #case-studies,
  #insights {
    grid-template-columns: 1fr;
  }

  #faq summary {
    padding: 14px 16px;
    font-size: 0.95rem;
  }

  #faq details p {
    padding: 0 16px 14px;
  }

  #howto ol li {
    padding: 14px 16px 14px 52px;
  }

  #howto ol li::before {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
    left: 12px;
  }

  footer nav ul {
    gap: 4px 16px;
  }

  #backToTop {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  #hero {
    padding: 80px 16px 40px;
  }

  #hero a[role="button"] {
    padding: 14px 32px;
    font-size: 0.95rem;
  }

  section {
    padding: 40px 12px;
  }

  #products article {
    padding: 24px 16px;
  }

  #services ul li,
  #advantages ul li {
    padding: 16px 18px;
  }

  #testimonials blockquote {
    padding: 20px;
  }

  #insights article {
    padding: 20px;
  }

  #contact ul li {
    padding: 14px 16px;
  }

  footer {
    padding: 32px 16px 20px;
  }
}

/* ===== Utility Classes ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}