/* ===== style.css ===== */
/* Bet365官方网站 - 注册畅享体育世界 */
/* 主题色: #1a3b5c, #f0c040, #0b1a2e */

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

:root {
  --primary: #1a3b5c;
  --primary-light: #2a5a7a;
  --primary-dark: #0b1a2e;
  --accent: #f0c040;
  --accent-hover: #e0b030;
  --glass-bg: rgba(255,255,255,0.08);
  --glass-border: rgba(255,255,255,0.15);
  --shadow: 0 8px 32px rgba(0,0,0,0.2);
  --radius: 20px;
  --radius-sm: 12px;
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --bg: #f5f7fa;
  --text: #1a2a3a;
  --text-light: #4a5a6a;
  --card-bg: #ffffff;
  --section-bg: #ffffff;
}

.dark-mode {
  --bg: #0b1a2e;
  --text: #e8ecf0;
  --text-light: #a0b0c0;
  --card-bg: #132a3e;
  --section-bg: #0f1f30;
  --glass-bg: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.08);
  --shadow: 0 8px 32px rgba(0,0,0,0.5);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  transition: background 0.5s, color 0.5s;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-title {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 3rem;
  max-width: 640px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  background: var(--accent);
  color: #0b1a2e;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(240,192,64,0.3);
}

.btn-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  color: var(--text);
}

.btn-glass:hover {
  background: rgba(255,255,255,0.15);
  color: var(--text);
}

/* ===== Glass Card ===== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.glass-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.25);
}

/* ===== Grid ===== */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

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

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ===== Badge ===== */
.badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 50px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-size: 0.85rem;
  font-weight: 500;
  backdrop-filter: blur(8px);
}

/* ===== Header ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 12px 0;
  transition: var(--transition);
  background: rgba(11,26,46,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

header.scrolled {
  background: rgba(11,26,46,0.95);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
}

.logo svg {
  width: 40px;
  height: 40px;
}

nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

nav a {
  color: rgba(255,255,255,0.7);
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

nav a:hover, nav a.active {
  color: #fff;
  background: rgba(255,255,255,0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dark-toggle {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  transition: var(--transition);
}

.dark-toggle:hover {
  background: rgba(255,255,255,0.1);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
  padding: 8px;
}

@media (max-width: 900px) {
  nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(11,26,46,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  nav.open {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #0b1a2e 0%, #1a3b5c 50%, #2a5a7a 100%);
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(240,192,64,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-bg-shapes {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-bg-shapes svg {
  position: absolute;
  opacity: 0.05;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 24px;
  border-radius: 50px;
  background: rgba(240,192,64,0.15);
  border: 1px solid rgba(240,192,64,0.3);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.hero h1 {
  font-size: 4.2rem;
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
  max-width: 560px;
  line-height: 1.8;
}

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

.hero-visual {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: 45%;
  max-width: 560px;
  opacity: 0.8;
}

@media (max-width: 900px) {
  .hero h1 {
    font-size: 2.6rem;
  }
  .hero-visual {
    position: relative;
    right: auto;
    top: auto;
    transform: none;
    width: 100%;
    margin-top: 40px;
    opacity: 1;
  }
}

/* ===== Banner Slider ===== */
.banner-slider {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
}

.banner-slide {
  display: none;
  width: 100%;
}

.banner-slide.active {
  display: block;
  animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.98);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.banner-dots {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.banner-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  cursor: pointer;
  transition: var(--transition);
}

.banner-dots span.active {
  background: var(--accent);
  width: 32px;
  border-radius: 6px;
}

/* ===== Scroll Animation ===== */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ===== FAQ ===== */
.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;
}

.faq-question::after {
  content: '+';
  font-size: 1.6rem;
  transition: var(--transition);
  color: var(--accent);
}

.faq-item.open .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, padding 0.3s ease;
  padding-top: 0;
  color: var(--text-light);
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-top: 16px;
}

/* ===== Footer ===== */
footer {
  background: #0b1a2e;
  color: rgba(255,255,255,0.7);
  padding: 60px 0 30px;
}

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

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

footer a {
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 24px;
  margin-top: 40px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
}

/* ===== Back to Top ===== */
#back-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--accent);
  color: #0b1a2e;
  border: none;
  font-size: 1.6rem;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

#back-top.visible {
  opacity: 1;
  transform: translateY(0);
}

#back-top:hover {
  transform: translateY(-4px);
}

/* ===== Search Modal ===== */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
}

.search-modal.open {
  display: flex;
}

.search-modal-inner {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 40px;
  width: 90%;
  max-width: 600px;
}

.search-modal input {
  width: 100%;
  padding: 16px 24px;
  border-radius: 50px;
  border: 2px solid var(--glass-border);
  background: var(--bg);
  color: var(--text);
  font-size: 1.1rem;
  outline: none;
  transition: border-color 0.3s ease;
}

.search-modal input:focus {
  border-color: var(--accent);
}

/* ===== Count Animation ===== */
.count-num {
  display: inline-block;
  font-size: 2.4rem;
  font-weight: 700;
}

/* ===== Misc ===== */
.text-center {
  text-align: center;
}

.mb-2 {
  margin-bottom: 2rem;
}

.mb-4 {
  margin-bottom: 4rem;
}

.mt-4 {
  margin-top: 4rem;
}

.gap-2 {
  gap: 2rem;
}

.flex-wrap {
  display: flex;
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

/* ===== Form Elements ===== */
input, textarea {
  font-family: var(--font);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 3px rgba(240,192,64,0.15);
}

/* ===== Additional Hover Effects ===== */
.glass-card h3 {
  transition: color 0.3s ease;
}

.glass-card:hover h3 {
  color: var(--accent);
}

/* ===== Responsive Fine-tune ===== */
@media (max-width: 600px) {
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 2rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .btn {
    padding: 12px 28px;
    font-size: 0.9rem;
  }
  .glass-card {
    padding: 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  #back-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
  }
}