/* ============================================
   Shaanxi Huaxi Keming IT Co., Ltd. - Global Styles
   ============================================ */

/* CSS Variables */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-glass: rgba(22, 22, 31, 0.75);
  --border: rgba(255, 255, 255, 0.06);
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --success: #22c55e;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

/* Default to English: hide Chinese content when html lang is en */
html[lang="en"] [data-page-content$="_zh"],
html:not([lang="zh"]):not([lang="zh-CN"]) [data-page-content$="_zh"] {
  display: none;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

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

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

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #444;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 3rem;
}

/* ============================================
   Layout Utilities
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 6rem 0;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom-color: var(--border);
  padding: 0.7rem 0;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: white;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: var(--transition);
  border-radius: 2px;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 0.3rem;
  cursor: pointer;
}

.lang-switch span {
  padding: 0.35rem 0.8rem;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
  color: var(--text-muted);
}

.lang-switch span.active {
  background: var(--accent-gradient);
  color: white;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 50%, rgba(139, 92, 246, 0.08), transparent);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  inset: 0;
  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: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 40%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 40%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  backdrop-filter: blur(10px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 2.5rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.45);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: rgba(255,255,255,0.15);
}

.hero-visual {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  opacity: 0.6;
  pointer-events: none;
}

.hero-visual .orbit {
  position: absolute;
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 50%;
  animation: orbit-rotate 20s linear infinite;
}

.hero-visual .orbit:nth-child(1) {
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}

.hero-visual .orbit:nth-child(2) {
  width: 70%;
  height: 70%;
  top: 15%;
  left: 15%;
  animation-duration: 15s;
  animation-direction: reverse;
  border-color: rgba(139, 92, 246, 0.2);
}

.hero-visual .orbit:nth-child(3) {
  width: 40%;
  height: 40%;
  top: 30%;
  left: 30%;
  animation-duration: 10s;
  border-color: rgba(99, 102, 241, 0.3);
}

.orbit::before {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 15px var(--accent);
}

@keyframes orbit-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ============================================
   Cards & Components
   ============================================ */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.2rem;
}

.card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
}

/* ============================================
   Stats
   ============================================ */

.stats-bar {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 3rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  text-align: center;
}

.stat-item h4 {
  font-size: 2.2rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

/* ============================================
   Feature List
   ============================================ */

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.feature-list .check {
  width: 24px;
  height: 24px;
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================================
   Team
   ============================================ */

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.team-card {
  text-align: center;
  padding: 2rem;
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--accent-gradient);
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: white;
}

.team-card h4 {
  font-size: 1rem;
}

.team-card p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ============================================
   Contact Form
   ============================================ */

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-info-item .icon {
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-info-item h4 {
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
}

.contact-info-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ============================================
   Legal Pages (Privacy & Terms)
   ============================================ */

.legal-content {
  max-width: 900px;
  margin: 0 auto;
}

.legal-section {
  margin-bottom: 2.5rem;
}

.legal-section h3 {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

.legal-section p,
.legal-section li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 0.8rem;
}

.legal-section ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.legal-section li {
  margin-bottom: 0.5rem;
}

.legal-date {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 300px;
}

.footer-links h4 {
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
}

.footer-links ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-bottom-links a:hover {
  color: var(--text-secondary);
}

/* ============================================
   Animations
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   Mobile Responsive
   ============================================ */

@media (max-width: 900px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.2rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero-visual {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 0 1.2rem;
  }

  section {
    padding: 4rem 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}