/* WPS Workplace - Set 1 Official Style */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue: #0B3D91;
  --blue-dark: #082d6b;
  --blue-light: #1a56b8;
  --white: #ffffff;
  --gray-50: #f7f9fc;
  --gray-100: #eef2f7;
  --gray-200: #d8dee8;
  --gray-400: #8a96a8;
  --gray-600: #4a5568;
  --gray-800: #2d3748;
  --shadow: 0 4px 24px rgba(11, 61, 145, 0.08);
  --radius: 8px;
  --max-w: 1180px;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-800);
  background: linear-gradient(165deg, var(--gray-50) 0%, #e8edf5 40%, var(--gray-100) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(11, 61, 145, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(11, 61, 145, 0.04) 0%, transparent 45%);
  pointer-events: none;
  z-index: -1;
}

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

a { color: var(--blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--blue-light); }

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

/* Header & Nav */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--blue);
}

.logo svg { width: 32px; height: 32px; flex-shrink: 0; }

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
}

.main-nav a {
  color: var(--gray-600);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 20px 0 18px;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover { color: var(--blue); }

.main-nav a.active {
  color: var(--blue);
  border-bottom-color: var(--blue);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--blue);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: var(--white);
  padding: 72px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.25rem;
  line-height: 1.3;
  margin-bottom: 20px;
  font-weight: 700;
}

.hero-lead {
  font-size: 1.05rem;
  opacity: 0.92;
  margin-bottom: 28px;
  line-height: 1.8;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.hero-tag {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
}

.hero-cta-panel {
  background: var(--white);
  border-radius: 12px;
  padding: 36px 32px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  text-align: center;
}

.hero-cta-panel h2 {
  color: var(--blue);
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.hero-cta-panel p {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn svg { width: 20px; height: 20px; flex-shrink: 0; }

.btn-primary {
  background: var(--blue);
  color: var(--white);
  width: 100%;
  padding: 18px 32px;
  font-size: 1.1rem;
}

.btn-primary:hover {
  background: var(--blue-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(11, 61, 145, 0.35);
}

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

.btn-secondary {
  background: var(--gray-100);
  color: var(--blue);
  border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
  background: var(--white);
  border-color: var(--blue);
}

.btn-outline {
  background: transparent;
  color: var(--blue);
  border: 2px solid var(--blue);
}

.btn-outline:hover {
  background: var(--blue);
  color: var(--white);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.9rem;
}

/* Sections */
.section {
  padding: 64px 0;
}

.section-alt {
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 1.75rem;
  color: var(--blue);
  margin-bottom: 12px;
}

.section-header p {
  color: var(--gray-600);
  max-width: 640px;
  margin: 0 auto;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.feature-card:hover {
  box-shadow: 0 8px 32px rgba(11, 61, 145, 0.12);
  border-color: var(--blue);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(11, 61, 145, 0.08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--blue);
}

.feature-icon svg { width: 24px; height: 24px; }

.feature-card h3 {
  font-size: 1.1rem;
  color: var(--gray-800);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--gray-600);
  line-height: 1.65;
}

/* Platform Cards */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}

.platform-card svg {
  width: 40px;
  height: 40px;
  margin: 0 auto 14px;
  color: var(--blue);
}

.platform-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
  color: var(--gray-800);
}

.platform-card p {
  font-size: 0.85rem;
  color: var(--gray-400);
  margin-bottom: 16px;
}

/* Two Column */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.content-block h2 {
  font-size: 1.5rem;
  color: var(--blue);
  margin-bottom: 16px;
}

.content-block h3 {
  font-size: 1.15rem;
  color: var(--gray-800);
  margin: 24px 0 10px;
}

.content-block p {
  margin-bottom: 14px;
  color: var(--gray-600);
}

.content-block ul {
  margin: 12px 0 16px 20px;
  color: var(--gray-600);
}

.content-block li { margin-bottom: 8px; }

/* Reviews */
.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--white);
  border-left: 4px solid var(--blue);
  padding: 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow);
}

.review-card blockquote {
  font-style: normal;
  color: var(--gray-600);
  margin-bottom: 16px;
  line-height: 1.7;
}

.review-author {
  font-weight: 600;
  color: var(--gray-800);
  font-size: 0.9rem;
}

.review-meta {
  font-size: 0.82rem;
  color: var(--gray-400);
}

/* Stats */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  background: var(--white);
  padding: 32px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--blue);
  display: block;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--gray-600);
}

/* Comparison Table */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.compare-table th,
.compare-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.compare-table th {
  background: var(--blue);
  color: var(--white);
  font-weight: 600;
}

.compare-table tr:last-child td { border-bottom: none; }

.compare-table td:first-child { font-weight: 500; color: var(--gray-800); }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-item h3 {
  padding: 18px 24px;
  font-size: 1rem;
  color: var(--blue);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.faq-item p {
  padding: 16px 24px 20px;
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* Steps */
.steps-list {
  counter-reset: step;
  list-style: none;
  max-width: 720px;
  margin: 0 auto;
}

.steps-list li {
  counter-increment: step;
  position: relative;
  padding: 20px 20px 20px 64px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.steps-list li::before {
  content: counter(step);
  position: absolute;
  left: 20px;
  top: 20px;
  width: 32px;
  height: 32px;
  background: var(--blue);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.steps-list li h3 {
  font-size: 1.05rem;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.steps-list li p {
  color: var(--gray-600);
  font-size: 0.92rem;
}

/* Download Hero */
.download-hero {
  background: linear-gradient(135deg, var(--blue) 0%, #0a3278 100%);
  color: var(--white);
  padding: 56px 0;
  text-align: center;
}

.download-hero h1 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.download-hero p {
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

.download-main-btn {
  display: inline-flex;
}

.download-main-btn .btn-primary {
  width: auto;
  min-width: 280px;
}

/* CTA Banner */
.cta-banner {
  background: var(--blue);
  color: var(--white);
  padding: 48px 0;
  text-align: center;
}

.cta-banner h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.cta-banner p {
  opacity: 0.9;
  margin-bottom: 24px;
}

.cta-banner .btn-outline {
  border-color: var(--white);
  color: var(--white);
}

.cta-banner .btn-outline:hover {
  background: var(--white);
  color: var(--blue);
}

.cta-banner .btn-primary {
  width: auto;
  background: var(--white);
  color: var(--blue);
}

.cta-banner .btn-primary:hover {
  background: var(--gray-100);
}

/* Article prose */
.prose h2 {
  font-size: 1.5rem;
  color: var(--blue);
  margin: 40px 0 16px;
}

.prose h2:first-child { margin-top: 0; }

.prose h3 {
  font-size: 1.15rem;
  color: var(--gray-800);
  margin: 28px 0 12px;
}

.prose p {
  margin-bottom: 16px;
  color: var(--gray-600);
  line-height: 1.8;
}

.prose ul {
  margin: 12px 0 20px 24px;
  color: var(--gray-600);
}

.prose li { margin-bottom: 8px; }

/* Footer */
.site-footer {
  background: var(--gray-800);
  color: var(--gray-200);
  padding: 40px 0 32px;
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  margin-bottom: 28px;
}

.footer-safe {
  background: rgba(255, 255, 255, 0.06);
  border-left: 3px solid var(--blue-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  line-height: 1.7;
}

.footer-safe strong { color: var(--white); }

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

.footer-links li { margin-bottom: 8px; }

.footer-links a { color: var(--gray-200); }
.footer-links a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  color: var(--gray-400);
  font-size: 0.82rem;
  line-height: 1.6;
}

/* Spin animation for download.js */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 960px) {
  .hero-grid,
  .two-col { grid-template-columns: 1fr; }

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

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

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

  .stats-row { grid-template-columns: repeat(2, 1fr); }

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

@media (max-width: 640px) {
  .main-nav { display: none; }

  .main-nav.open {
    display: block;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow);
  }

  .main-nav.open ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
  }

  .main-nav.open a {
    display: block;
    padding: 14px 24px;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .main-nav.open a.active {
    border-left-color: var(--blue);
    background: var(--gray-50);
  }

  .nav-toggle { display: block; }

  .hero { padding: 48px 0 56px; }

  .hero h1 { font-size: 1.65rem; }

  .feature-grid,
  .platform-grid,
  .stats-row { grid-template-columns: 1fr; }

  .section { padding: 48px 0; }

  .compare-table { font-size: 0.85rem; }

  .compare-table th,
  .compare-table td { padding: 10px 12px; }
}