/* ==========================================================================
   FANSHENG TECHNOLOGY (繁升科技) - OFFICIAL DESIGN SYSTEM & STYLES
   Modern Futuristic Dark / Cyber-Glow Aesthetics
   ========================================================================== */

:root {
  --bg-primary: #0A0D14;
  --bg-secondary: #111726;
  --bg-card: rgba(22, 29, 47, 0.7);
  --bg-card-hover: rgba(30, 41, 67, 0.85);
  
  --primary-cyan: #00F0FF;
  --primary-purple: #7928CA;
  --primary-pink: #FF007A;
  --primary-blue: #0070F3;
  --accent-green: #00DF8F;

  --text-main: #FFFFFF;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 240, 255, 0.25);
  
  --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Glow Backgrounds */
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  z-index: -1;
  pointer-events: none;
}
.glow-1 {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.18) 0%, rgba(121, 40, 202, 0.08) 70%, transparent 100%);
  top: -100px;
  left: 10%;
}
.glow-2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 0, 122, 0.12) 0%, rgba(121, 40, 202, 0.06) 70%, transparent 100%);
  top: 800px;
  right: 5%;
}
.glow-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 223, 143, 0.12) 0%, rgba(0, 112, 243, 0.05) 70%, transparent 100%);
  bottom: 200px;
  left: 20%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 13, 20, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}
.brand-sub {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary-cyan);
  letter-spacing: 1px;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-links a:hover {
  color: var(--primary-cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-pill {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}
.btn-pill:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary-cyan);
}

.btn-primary-sm {
  background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-purple) 100%);
  color: #FFFFFF;
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: none;
  cursor: pointer;
}
.btn-primary-sm:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 240, 255, 0.35);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  padding: 170px 0 90px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 30px;
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.25);
  font-size: 0.85rem;
  color: var(--primary-cyan);
  font-weight: 500;
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.6; }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 20%, var(--primary-cyan) 60%, #C084FC 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 720px;
  margin: 0 auto 40px;
}

.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-bottom: 60px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-purple) 100%);
  color: #FFFFFF;
  text-decoration: none;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  box-shadow: 0 6px 24px rgba(0, 240, 255, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 240, 255, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  text-decoration: none;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.25);
}

/* Stats Bar */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: space-around;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px 32px;
  backdrop-filter: blur(12px);
}
.stat-item {
  text-align: center;
}
.stat-number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-cyan);
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border-color);
}

/* ==========================================================================
   SECTIONS GENERAL
   ========================================================================== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  margin-bottom: 56px;
}
.text-center {
  text-align: center;
}

.section-subtitle {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--primary-cyan);
  text-transform: uppercase;
  display: block;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ==========================================================================
   PRODUCT SECTION (VitalPulse Spotlight)
   ========================================================================== */
.product-card.main-feature {
  background: linear-gradient(145deg, rgba(20, 27, 45, 0.9) 0%, rgba(12, 16, 28, 0.95) 100%);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 48px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.product-info .tag {
  display: inline-block;
  background: rgba(121, 40, 202, 0.2);
  border: 1px solid rgba(121, 40, 202, 0.4);
  color: #D8B4FE;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.product-info h3 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.product-info p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.feature-checklist li {
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 500;
}

/* Phone Mockup Component */
.phone-mockup {
  width: 280px;
  height: 480px;
  background: #000000;
  border-radius: 36px;
  border: 4px solid #334155;
  box-shadow: 0 25px 50px -12px rgba(0, 240, 255, 0.25);
  margin: 0 auto;
  position: relative;
  overflow: hidden;
  padding: 12px;
}
.mockup-notch {
  width: 100px;
  height: 18px;
  background: #1E293B;
  border-radius: 10px;
  margin: 0 auto 12px;
}
.mockup-screen {
  background: #0B0E17;
  border-radius: 24px;
  height: calc(100% - 30px);
  padding: 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.mockup-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 600;
}
.mockup-ring {
  margin: 20px auto;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  border: 4px solid rgba(0, 240, 255, 0.2);
  border-top-color: var(--primary-cyan);
  border-right-color: var(--primary-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rotateGlow 8s linear infinite;
}
@keyframes rotateGlow {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
.ring-circle {
  text-align: center;
  transform: rotate(0deg); /* counter rotation handled if needed */
}
.ring-val {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: #FFFFFF;
}
.ring-unit {
  font-size: 0.55rem;
  color: var(--primary-cyan);
  letter-spacing: 1px;
}
.mockup-chart {
  height: 50px;
  background: linear-gradient(180deg, rgba(0, 240, 255, 0.15) 0%, transparent 100%);
  border-bottom: 2px solid var(--primary-cyan);
  border-radius: 6px;
  position: relative;
}
.mockup-metrics {
  display: flex;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 8px;
}
.m-box {
  text-align: center;
}
.m-box span {
  display: block;
  font-size: 0.6rem;
  color: var(--text-muted);
}
.m-box strong {
  font-size: 0.85rem;
  color: #FFFFFF;
}

/* ==========================================================================
   TECH SECTION
   ========================================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 32px;
  transition: all var(--transition-fast);
}
.tech-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-4px);
}
.tech-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
}
.tech-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.tech-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   ABOUT US SECTION
   ========================================================================== */
.about-wrapper {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}
.about-text .paragraph {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 18px;
}
.company-highlights {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 500;
}
.hl-check {
  color: var(--accent-green);
  font-weight: bold;
}

.corporate-info-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}
.corporate-info-box h4 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--primary-cyan);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}
.info-row {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.info-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}
.info-val {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 600;
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.contact-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition-fast);
}
.contact-item:hover {
  border-color: var(--primary-cyan);
  transform: translateY(-3px);
}
.contact-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}
.contact-item h4 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}
.contact-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 36px 0;
  background: #080A10;
}
.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.footer-right a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}
.footer-right a:hover {
  color: var(--primary-cyan);
}
.sep {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ==========================================================================
   MODAL DIALOG (Privacy & Terms)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  max-width: 680px;
  width: 100%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
  animation: modalFadeIn 0.3s ease-out;
}
@keyframes modalFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h3 {
  font-size: 1.25rem;
  color: var(--text-main);
}
.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
}
.modal-close:hover {
  color: #FFFFFF;
}
.modal-body {
  padding: 24px;
  overflow-y: auto;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.modal-body h4 {
  color: #FFFFFF;
  margin: 16px 0 8px;
}
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 992px) {
  .hero-title { font-size: 2.6rem; }
  .product-card.main-feature { grid-template-columns: 1fr; gap: 32px; }
  .about-wrapper { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-title { font-size: 2.2rem; }
  .hero-stats { flex-direction: column; gap: 20px; }
  .stat-divider { display: none; }
  .tech-grid { grid-template-columns: 1fr; }
  .footer-content { flex-direction: column; gap: 16px; text-align: center; }
}