* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary-blue: #1890ff;
  --primary-dark: #0050b3;
  --success-green: #52c41a;
  --warning-orange: #fa8c16;
  --danger-red: #f5222d;
  --bg-dark: #001529;
  --bg-light: #f0f5ff;
}
body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #fff;
  color: #333;
  overflow-x: hidden;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  background: linear-gradient(135deg, #001529 0%, #003a8c 50%, #0050b3 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.particles { position: absolute; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; }
.particle {
  position: absolute;
  width: 4px; height: 4px;
  background: rgba(255,255,255,0.5);
  border-radius: 50%;
  animation: float 15s infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}
.grid-overlay {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}
.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}
.glow-orb.blue { width: 400px; height: 400px; background: #1890ff; top: -100px; right: -100px; animation: pulse-glow 4s ease-in-out infinite; }
.glow-orb.green { width: 300px; height: 300px; background: #52c41a; bottom: -50px; left: -50px; animation: pulse-glow 5s ease-in-out infinite reverse; }
.glow-orb.cyan { width: 250px; height: 250px; background: #13c2c2; top: 50%; left: 20%; animation: pulse-glow 6s ease-in-out infinite; }
@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.2); opacity: 0.6; }
}
.hero-content {
  position: relative; z-index: 10;
  text-align: center;
  padding: 40px 24px;
  max-width: 800px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 8px 20px;
  border-radius: 50px;
  color: #fff; font-size: 14px;
  margin-bottom: 30px;
}
.hero-badge i { color: #52c41a; }
.hero-icon {
  width: 120px; height: 120px;
  margin: 0 auto 30px;
  background: linear-gradient(135deg, #1890ff 0%, #52c41a 100%);
  border-radius: 30px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 20px 60px rgba(24, 144, 255, 0.4);
  animation: float-icon 3s ease-in-out infinite;
  position: relative;
}
.hero-icon::before {
  content: '';
  position: absolute; top: -3px; left: -3px; right: -3px; bottom: -3px;
  background: linear-gradient(135deg, #1890ff, #52c41a, #1890ff);
  border-radius: 32px; z-index: -1;
  animation: rotate-border 3s linear infinite;
}
@keyframes rotate-border { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes float-icon { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }
.hero-icon i { font-size: 50px; color: #fff; }
.hero h1 {
  font-size: 48px; font-weight: 900; color: #fff;
  margin-bottom: 20px;
  text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}
.hero-subtitle { font-size: 20px; color: rgba(255,255,255,0.9); margin-bottom: 15px; letter-spacing: 8px; }
.hero-desc { font-size: 16px; color: rgba(255,255,255,0.7); margin-bottom: 40px; }

/* Hero Entry Cards */
.hero-entries {
  display: flex; gap: 20px; justify-content: center; flex-wrap: wrap;
  margin-bottom: 20px;
}
.entry-card {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  width: 140px; padding: 28px 16px;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  color: #fff; text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
}
.entry-card:hover {
  transform: translateY(-6px);
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.4);
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}
.entry-icon {
  width: 56px; height: 56px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: #fff;
}
.visitor-entry .entry-icon { background: linear-gradient(135deg, #1890ff, #36cfc9); }
.admin-entry .entry-icon { background: linear-gradient(135deg, #722ed1, #b37feb); }
.employee-entry .entry-icon { background: linear-gradient(135deg, #fa8c16, #ffc069); }
.entry-card span { font-size: 15px; font-weight: 600; letter-spacing: 1px; }

.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 16px 36px; border-radius: 50px;
  font-size: 16px; font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer; border: none;
}
.btn-primary {
  background: linear-gradient(135deg, #1890ff 0%, #36cfc9 100%);
  color: #fff;
  box-shadow: 0 10px 40px rgba(24, 144, 255, 0.4);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 50px rgba(24, 144, 255, 0.5); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.5); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; }
.scroll-indicator {
  position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,0.6); font-size: 14px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  animation: bounce 2s infinite;
}
.scroll-indicator i { font-size: 24px; }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* Stats Section */
.stats-section { background: #fff; padding: 0; margin-top: -60px; position: relative; z-index: 20; }
.stats-container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
.stats-card {
  background: #fff; border-radius: 20px; padding: 40px 30px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.1);
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.stat-item { text-align: center; padding: 20px; border-radius: 16px; transition: all 0.3s ease; }
.stat-item:hover { background: var(--bg-light); transform: translateY(-5px); }
.stat-icon {
  width: 60px; height: 60px; margin: 0 auto 15px;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: #fff;
}
.stat-icon.blue { background: linear-gradient(135deg, #1890ff, #36cfc9); }
.stat-icon.green { background: linear-gradient(135deg, #52c41a, #95de64); }
.stat-icon.orange { background: linear-gradient(135deg, #fa8c16, #ffc069); }
.stat-icon.red { background: linear-gradient(135deg, #f5222d, #ff7875); }
.stat-num {
  font-size: 36px; font-weight: 900;
  background: linear-gradient(135deg, #1890ff, #52c41a);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { font-size: 14px; color: #8c8c8c; margin-top: 5px; }

/* Features Section */
.features-section { padding: 100px 20px; background: linear-gradient(180deg, #fff 0%, #f0f5ff 100%); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
  display: inline-block; padding: 6px 16px;
  background: linear-gradient(135deg, #e6f7ff, #d9f7be);
  color: #1890ff; border-radius: 20px; font-size: 14px; font-weight: 600; margin-bottom: 20px;
}
.section-title { font-size: 36px; font-weight: 800; color: #001529; margin-bottom: 15px; }
.section-subtitle { font-size: 16px; color: #8c8c8c; }
.features-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.feature-card {
  background: #fff; border-radius: 24px; padding: 40px 30px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.05);
  transition: all 0.4s ease;
  border: 1px solid #f0f0f0;
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, #1890ff, #52c41a);
  transform: scaleX(0); transition: transform 0.4s ease;
}
.feature-card:hover { transform: translateY(-10px); box-shadow: 0 20px 60px rgba(24, 144, 255, 0.15); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 80px; height: 80px; margin: 0 auto 25px;
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 32px; color: #fff; position: relative;
}
.feature-icon::after {
  content: ''; position: absolute; width: 100%; height: 100%;
  border-radius: 20px; background: inherit; filter: blur(20px); opacity: 0.4; z-index: -1;
}
.feature-icon.blue { background: linear-gradient(135deg, #1890ff, #69c0ff); }
.feature-icon.green { background: linear-gradient(135deg, #52c41a, #95de64); }
.feature-icon.cyan { background: linear-gradient(135deg, #13c2c2, #5cdbd3); }
.feature-icon.orange { background: linear-gradient(135deg, #fa8c16, #ffc069); }
.feature-icon.red { background: linear-gradient(135deg, #f5222d, #ff7875); }
.feature-icon.purple { background: linear-gradient(135deg, #722ed1, #b37feb); }
.feature-icon.teal { background: linear-gradient(135deg, #08979c, #36cfc9); }
.feature-icon.indigo { background: linear-gradient(135deg, #2f54eb, #85a5ff); }
.feature-card h3 { font-size: 20px; font-weight: 700; color: #001529; margin-bottom: 12px; }
.feature-card p { font-size: 14px; color: #8c8c8c; line-height: 1.8; }

/* Process Section */
.process-section {
  padding: 100px 20px;
  background: linear-gradient(135deg, #e8f4ff 0%, #f0f9ff 50%, #e6fffb 100%);
  position: relative; overflow: hidden;
}
.process-section .glow-orb { opacity: 0.1; }
.process-section .section-title { color: #001529; }
.process-section .section-subtitle { color: #8c8c8c; }
.process-section .section-tag { background: linear-gradient(135deg, #e6f7ff, #d9f7be); color: #1890ff; }
.process-timeline { max-width: 900px; margin: 0 auto; position: relative; }
.process-line {
  position: absolute; top: 60px; left: 10%; right: 10%; height: 4px;
  background: linear-gradient(90deg, #4096ff, #36cfc9, #9254de, #ff7a45, #52c41a);
  border-radius: 2px; opacity: 0.4;
}
.process-steps { display: flex; justify-content: space-between; position: relative; z-index: 1; }
.process-step { text-align: center; flex: 1; }
.step-circle {
  width: 120px; height: 120px; margin: 0 auto 25px;
  background: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  position: relative; border: 3px solid transparent; transition: all 0.3s ease;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}
.step-circle:hover { transform: scale(1.1); box-shadow: 0 15px 40px rgba(0,0,0,0.15); }
.step-circle.step-1 { border-color: #4096ff; }
.step-circle.step-2 { border-color: #36cfc9; }
.step-circle.step-3 { border-color: #9254de; }
.step-circle.step-4 { border-color: #ff7a45; }
.step-circle.step-5 { border-color: #52c41a; }
.step-circle i { font-size: 40px; }
.step-circle.step-1 i { color: #4096ff; }
.step-circle.step-2 i { color: #36cfc9; }
.step-circle.step-3 i { color: #9254de; }
.step-circle.step-4 i { color: #ff7a45; }
.step-circle.step-5 i { color: #52c41a; }
.step-num {
  position: absolute; top: -10px; right: -10px;
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; color: #fff;
}
.step-num-1 { background: linear-gradient(135deg, #4096ff, #69c0ff); }
.step-num-2 { background: linear-gradient(135deg, #36cfc9, #5cdbd3); }
.step-num-3 { background: linear-gradient(135deg, #9254de, #b37feb); }
.step-num-4 { background: linear-gradient(135deg, #ff7a45, #ffa07a); }
.step-num-5 { background: linear-gradient(135deg, #52c41a, #95de64); }
.process-step h4 { font-size: 18px; font-weight: 700; color: #001529; margin-bottom: 8px; }
.process-step p { font-size: 14px; color: #8c8c8c; }

/* Advantages Section */
.advantages-section { padding: 100px 20px; background: #fff; }
.advantages-grid { max-width: 1000px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.advantage-card {
  display: flex; align-items: flex-start; gap: 20px; padding: 30px;
  background: #f8fafc; border-radius: 20px;
  transition: all 0.3s ease; border: 2px solid transparent;
}
.advantage-card:hover {
  background: #fff; border-color: #1890ff;
  box-shadow: 0 10px 40px rgba(24, 144, 255, 0.1);
  transform: translateX(10px);
}
.adv-icon {
  width: 60px; height: 60px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; color: #fff; flex-shrink: 0;
}
.adv-icon.blue { background: linear-gradient(135deg, #1890ff, #69c0ff); }
.adv-icon.green { background: linear-gradient(135deg, #52c41a, #95de64); }
.adv-icon.orange { background: linear-gradient(135deg, #fa8c16, #ffc069); }
.adv-icon.red { background: linear-gradient(135deg, #f5222d, #ff7875); }
.adv-icon.teal { background: linear-gradient(135deg, #08979c, #36cfc9); }
.adv-icon.indigo { background: linear-gradient(135deg, #2f54eb, #85a5ff); }
.adv-content h4 { font-size: 18px; font-weight: 700; color: #001529; margin-bottom: 8px; }
.adv-content p { font-size: 14px; color: #8c8c8c; line-height: 1.7; }

/* CTA Section */
.cta-section {
  padding: 100px 20px;
  background: linear-gradient(135deg, #1890ff 0%, #36cfc9 50%, #52c41a 100%);
  text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 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='0.05'%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");
}
.cta-content { position: relative; z-index: 1; }
.cta-section h2 { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 15px; }
.cta-section p { font-size: 18px; color: rgba(255,255,255,0.9); margin-bottom: 40px; }
.btn-white { background: #fff; color: #1890ff; box-shadow: 0 10px 40px rgba(0,0,0,0.2); }
.btn-white:hover { transform: translateY(-3px); box-shadow: 0 15px 50px rgba(0,0,0,0.3); }

/* Footer */
.footer { padding: 40px 20px; background: #001529; text-align: center; }
.footer-logo { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 20px; }
.footer-logo i { font-size: 28px; color: #1890ff; }
.footer-logo span { font-size: 18px; font-weight: 700; color: #fff; }
.footer p { color: rgba(255,255,255,0.5); font-size: 14px; }

/* AI Float */
.ai-float {
  position: fixed; right: 24px; bottom: 24px;
  width: 64px; height: 64px;
  background: linear-gradient(135deg, #1890ff 0%, #52c41a 100%);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 40px rgba(24, 144, 255, 0.4);
  z-index: 1000; transition: all 0.3s ease;
}
.ai-float:hover { transform: scale(1.1); }
.ai-float i { font-size: 28px; color: #fff; }
.ai-float::before {
  content: ''; position: absolute; width: 100%; height: 100%;
  border-radius: 50%; background: inherit;
  animation: ping 1.5s cubic-bezier(0,0,0.2,1) infinite;
}
@keyframes ping {
  75%, 100% { transform: scale(1.5); opacity: 0; }
}

/* Chat Modal */
.chat-modal {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5); z-index: 2000;
  justify-content: center; align-items: flex-end; padding: 20px;
}
.chat-modal.active { display: flex; }
.chat-container {
  width: 100%; max-width: 420px; height: 70vh; max-height: 600px;
  background: #fff; border-radius: 24px;
  display: flex; flex-direction: column; overflow: hidden;
  animation: slideUp 0.3s ease;
}
@keyframes slideUp { from { transform: translateY(100%); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.chat-header {
  padding: 20px;
  background: linear-gradient(135deg, #1890ff, #52c41a);
  display: flex; align-items: center; gap: 15px;
}
.chat-avatar {
  width: 50px; height: 50px;
  background: rgba(255,255,255,0.2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.chat-avatar i { font-size: 24px; color: #fff; }
.chat-info { flex: 1; }
.chat-info h3 { color: #fff; font-size: 18px; margin-bottom: 4px; }
.chat-info p { color: rgba(255,255,255,0.8); font-size: 13px; }
.chat-close {
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.2); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all 0.3s ease;
}
.chat-close:hover { background: rgba(255,255,255,0.3); }
.chat-close i { color: #fff; font-size: 16px; }
.chat-messages { flex: 1; overflow-y: auto; padding: 20px; background: #f8fafc; }
.message { display: flex; margin-bottom: 16px; }
.message.user { flex-direction: row-reverse; }
.msg-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.message.assistant .msg-avatar { background: linear-gradient(135deg, #1890ff, #52c41a); }
.message.user .msg-avatar { background: #e6e6e6; }
.msg-avatar i { font-size: 16px; color: #fff; }
.message.user .msg-avatar i { color: #666; }
.msg-bubble { max-width: 75%; padding: 14px 18px; border-radius: 18px; font-size: 14px; line-height: 1.6; margin: 0 12px; }
.message.assistant .msg-bubble { background: #fff; color: #333; border-bottom-left-radius: 4px; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.message.user .msg-bubble { background: linear-gradient(135deg, #1890ff, #36cfc9); color: #fff; border-bottom-right-radius: 4px; }
.quick-btns { padding: 12px 20px; background: #fff; display: flex; gap: 10px; flex-wrap: wrap; border-top: 1px solid #f0f0f0; }
.quick-btn {
  padding: 8px 16px; background: #e6f7ff; color: #1890ff;
  border-radius: 20px; font-size: 13px; cursor: pointer;
  border: none; transition: all 0.3s ease;
}
.quick-btn:hover { background: #1890ff; color: #fff; }
.chat-input { padding: 16px 20px; background: #fff; display: flex; gap: 12px; border-top: 1px solid #f0f0f0; }
.chat-input input {
  flex: 1; padding: 12px 20px;
  border: 2px solid #f0f0f0; border-radius: 25px;
  font-size: 14px; outline: none; transition: all 0.3s ease;
}
.chat-input input:focus { border-color: #1890ff; }
.chat-input button {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, #1890ff, #52c41a);
  border: none; border-radius: 50%;
  color: #fff; font-size: 18px;
  cursor: pointer; transition: all 0.3s ease;
}
.chat-input button:hover { transform: scale(1.05); }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero-subtitle { font-size: 16px; letter-spacing: 4px; }
  .stats-card { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr; }
  .process-steps { flex-direction: column; gap: 40px; }
  .process-line { display: none; }
  .advantages-grid { grid-template-columns: 1fr; }
  .scenarios-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 28px; }
  .cta-section h2 { font-size: 28px; }
}

/* Scenarios Section */
.scenarios-section { padding: 100px 20px; background: linear-gradient(180deg, #f0f5ff 0%, #fff 100%); }
.scenarios-grid {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.scenario-card {
  border-radius: 20px; overflow: hidden;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  transition: all 0.4s ease;
  background: #fff;
}
.scenario-card:hover { transform: translateY(-8px); box-shadow: 0 20px 50px rgba(0,0,0,0.15); }
.scenario-bg {
  height: 180px; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.scenario-bg::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 40px;
  background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.12));
}
.scenario-svg {
  width: 180px; height: 150px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.15));
}
.scenario-content { padding: 24px; }
.scenario-content h4 { font-size: 18px; font-weight: 700; color: #001529; margin-bottom: 8px; }
.scenario-content p { font-size: 14px; color: #8c8c8c; line-height: 1.7; }.scenario-content p { font-size: 14px; color: #666; line-height: 1.6; }

/* Back to Top Button */
.back-to-top {
  position: fixed; left: 20px; bottom: 20px;
  width: 50px; height: 50px;
  background: linear-gradient(135deg, #1890ff, #36cfc9);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 20px;
  cursor: pointer; z-index: 100;
  box-shadow: 0 4px 20px rgba(24,144,255,0.4);
  opacity: 0; visibility: hidden;
  transition: all 0.3s ease;
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(24,144,255,0.5); }