/* ============================================================
   WPS Office Landing Page - Global Stylesheet
   ============================================================ */

/* CSS Variables */
:root {
  --primary: #d63031;
  --primary-dark: #b82021;
  --primary-light: #ff6b6b;
  --secondary: #2d3436;
  --accent: #fdcb6e;
  --bg: #ffffff;
  --bg-light: #f8f9fa;
  --bg-dark: #1a1a2e;
  --text: #2d3436;
  --text-light: #636e72;
  --text-muted: #b2bec3;
  --border: #dfe6e9;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.08);
  --card-hover-shadow: 0 8px 40px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--primary-dark);
}

/* Spin Animation */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Fade In Animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeIn {
  animation: fadeIn 0.6s ease forwards;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   Navigation
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
}

.nav-brand svg {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-menu a {
  display: block;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-light);
  transition: var(--transition);
}

.nav-menu a:hover {
  color: var(--primary);
  background: rgba(214,48,49,0.06);
}

.nav-menu a.active {
  color: var(--primary);
  background: rgba(214,48,49,0.1);
  font-weight: 600;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(214,48,49,0.3);
}

.nav-cta svg {
  width: 18px;
  height: 18px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(214,48,49,0.35);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-light);
  color: var(--text);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* ============================================================
   Cards
   ============================================================ */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--card-hover-shadow);
  transform: translateY(-4px);
}

/* ============================================================
   Sections
   ============================================================ */
.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--secondary);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-light);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 56px;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--bg-dark);
  color: #fff;
  padding: 48px 0 24px;
}

.footer-disclaimer {
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.8;
  max-width: 800px;
  margin: 0 auto;
}

.footer-disclaimer a {
  color: var(--primary-light);
}

/* ============================================================
   Utilities
   ============================================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .section-title { font-size: 2rem; }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4, .grid-6 {
    grid-template-columns: 1fr;
  }

  .navbar-inner {
    height: 64px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  }

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

  .nav-menu a {
    width: 100%;
    padding: 12px 16px;
  }

  .mobile-toggle {
    display: block;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .container {
    padding: 0 16px;
  }
}

@media (max-width: 480px) {
  .section-title {
    font-size: 1.5rem;
  }

  .btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
  }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  .navbar, .site-footer {
    display: none;
  }
}