/* ===== WPS Office Download Site - Global Styles ===== */

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

:root {
  --brand-red: #e60012;
  --brand-red-dark: #c4000f;
  --brand-red-light: #ff1a2e;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #8a8a8a;
  --bg-white: #ffffff;
  --bg-light: #f7f8fa;
  --bg-card: #ffffff;
  --border-color: #e8e8e8;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --header-height: 64px;
}

html {
  scroll-behavior: smooth;
}

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

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

a {
  text-decoration: none;
  color: inherit;
}

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header & Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--brand-red);
}

.logo svg {
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--brand-red);
  background: rgba(230,0,18,0.04);
}

.nav-link.active {
  color: var(--brand-red);
  background: rgba(230,0,18,0.08);
  font-weight: 600;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand-red);
  color: #fff;
  box-shadow: 0 4px 14px rgba(230,0,18,0.3);
}

.btn-primary:hover {
  background: var(--brand-red-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230,0,18,0.35);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: #fff;
  color: var(--brand-red);
  border: 2px solid var(--brand-red);
}

.btn-secondary:hover {
  background: rgba(230,0,18,0.04);
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 40px;
  font-size: 18px;
  border-radius: var(--radius-lg);
}

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

/* ===== Section Common Styles ===== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-light);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Footer ===== */
.site-footer {
  background: #1a1a2e;
  color: rgba(255,255,255,0.7);
  padding: 50px 0 30px;
}

.footer-disclaimer {
  text-align: center;
  font-size: 14px;
  line-height: 2;
  color: rgba(255,255,255,0.6);
}

.footer-disclaimer strong {
  color: #fff;
  font-weight: 600;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .section-subtitle {
    font-size: 16px;
  }

  .main-nav {
    gap: 2px;
  }

  .nav-link {
    padding: 6px 12px;
    font-size: 14px;
  }

  .logo {
    font-size: 16px;
    gap: 6px;
  }

  .logo svg {
    width: 28px;
    height: 28px;
  }

  .btn-large {
    padding: 14px 28px;
    font-size: 16px;
  }
}