/* Site 1 ROOT — Corporate Blue Classic */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #1a5fb4;
  --dark: #0b3d7a;
  --accent: #e8f1fb;
  --text: #1e293b;
  --white: #ffffff;
  --muted: #64748b;
  --border: #d0e0f0;
  --max: 1100px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
  font-size: 16px;
}

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

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

a:hover {
  color: var(--dark);
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 4px rgba(11, 61, 122, 0.06);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--dark);
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
  color: var(--primary);
}

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

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

.nav-links a {
  display: block;
  padding: 8px 16px;
  color: var(--text);
  border-radius: 4px;
  font-weight: 500;
  text-decoration: none;
}

.nav-links a:hover {
  background: var(--accent);
  color: var(--primary);
  text-decoration: none;
}

.nav-links a.active {
  background: var(--primary);
  color: var(--white);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
  cursor: pointer;
  color: var(--dark);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary) 55%, #2b7fd4 100%);
  color: var(--white);
  padding: 64px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 2.15rem;
  line-height: 1.35;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 1.05rem;
  opacity: 0.95;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 0.98rem;
  opacity: 0.88;
  margin-bottom: 28px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-art {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-art svg {
  width: 100%;
  max-width: 420px;
  height: auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.75;
  cursor: wait;
}

.btn-primary {
  background: var(--white);
  color: var(--dark);
}

.btn-primary:hover {
  background: var(--accent);
  color: var(--dark);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.65);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--white);
}

.btn-solid {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.btn-solid:hover {
  background: var(--dark);
  border-color: var(--dark);
  color: var(--white);
}

.btn-ghost {
  background: var(--accent);
  color: var(--dark);
  border-color: var(--accent);
}

.btn-ghost:hover {
  background: #d4e6f7;
  color: var(--dark);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

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

.section-soft {
  background: linear-gradient(180deg, #f7fbff 0%, var(--white) 100%);
}

.section-head {
  margin-bottom: 36px;
  max-width: 780px;
}

.section-head h2 {
  font-size: 1.75rem;
  color: var(--dark);
  margin-bottom: 14px;
  line-height: 1.35;
}

.section-head p {
  color: var(--muted);
  font-size: 1.02rem;
}

.section-body {
  margin-bottom: 28px;
}

.section-body p {
  margin-bottom: 16px;
}

.section-body p:last-child {
  margin-bottom: 0;
}

/* Feature bands */
.band {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.band:last-child {
  margin-bottom: 0;
}

.band.reverse .band-visual {
  order: 2;
}

.band.reverse .band-copy {
  order: 1;
}

.band-copy h3 {
  font-size: 1.35rem;
  color: var(--dark);
  margin-bottom: 14px;
}

.band-copy p {
  margin-bottom: 14px;
  color: var(--text);
}

.band-visual {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.section-alt .band-visual {
  background: var(--white);
}

.band-visual svg {
  width: 120px;
  height: 120px;
  color: var(--primary);
}

/* Capability grid */
.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.cap-item {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.section-alt .cap-item {
  background: var(--white);
}

.cap-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--primary);
}

.cap-icon svg {
  width: 26px;
  height: 26px;
}

.cap-item h3 {
  font-size: 1.2rem;
  color: var(--dark);
  margin-bottom: 12px;
}

.cap-item p {
  color: var(--text);
  font-size: 0.98rem;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 28px;
}

.stat-card {
  text-align: center;
  padding: 28px 16px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.stat-num {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.92rem;
  color: var(--muted);
}

/* Download platforms */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.platform-card {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.platform-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  color: var(--dark);
  margin-bottom: 12px;
}

.platform-card h3 svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.platform-card p {
  margin-bottom: 18px;
  color: var(--text);
  font-size: 0.98rem;
}

/* Compare table */
.compare-wrap {
  overflow-x: auto;
  margin-top: 24px;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.compare-table th,
.compare-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

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

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

.compare-table tr:nth-child(even) td {
  background: #f7fbff;
}

.compare-table .highlight {
  color: var(--primary);
  font-weight: 600;
}

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

.review-card {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.review-card blockquote {
  font-style: normal;
  margin-bottom: 16px;
  color: var(--text);
}

.review-meta {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  padding: 22px 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.faq-item h3 {
  font-size: 1.08rem;
  color: var(--dark);
  margin-bottom: 10px;
}

.faq-item p {
  color: var(--text);
  font-size: 0.98rem;
}

/* Steps */
.steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 24px;
}

.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.15rem;
}

.step h3 {
  font-size: 1.15rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.step p {
  color: var(--text);
}

/* Article */
.article-hero {
  background: linear-gradient(135deg, var(--dark), var(--primary));
  color: var(--white);
  padding: 56px 0 60px;
}

.article-hero h1 {
  font-size: 2rem;
  line-height: 1.35;
  margin-bottom: 16px;
}

.article-hero p {
  opacity: 0.92;
  max-width: 720px;
  font-size: 1.02rem;
}

.article-body {
  padding: 56px 0 64px;
}

.article-body h2 {
  font-size: 1.55rem;
  color: var(--dark);
  margin: 40px 0 16px;
  padding-top: 8px;
}

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

.article-body h3 {
  font-size: 1.2rem;
  color: var(--primary);
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body ul {
  margin: 0 0 20px 1.25em;
}

.article-body li {
  margin-bottom: 8px;
}

.cta-box {
  margin: 40px 0;
  padding: 32px;
  background: var(--accent);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-align: center;
}

.cta-box h2,
.cta-box h3 {
  color: var(--dark);
  margin: 0 0 12px;
}

.cta-box p {
  margin-bottom: 20px;
  color: var(--text);
}

/* Requirements list */
.req-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

.req-card {
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.req-card h3 {
  color: var(--dark);
  margin-bottom: 14px;
  font-size: 1.15rem;
}

.req-card ul {
  margin-left: 1.2em;
}

.req-card li {
  margin-bottom: 8px;
  color: var(--text);
}

/* Featured download */
.featured-dl {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 36px;
  align-items: center;
  padding: 36px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.featured-dl h2 {
  font-size: 1.5rem;
  color: var(--dark);
  margin-bottom: 14px;
}

.featured-dl p {
  margin-bottom: 14px;
}

.featured-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.featured-visual {
  display: flex;
  justify-content: center;
}

.featured-visual svg {
  width: 160px;
  height: 160px;
  color: var(--primary);
}

/* Footer */
.site-footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.9);
  padding: 40px 0 32px;
}

.footer-safe {
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 18px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.85);
}

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

.footer-copy {
  font-size: 0.88rem;
  opacity: 0.78;
  line-height: 1.7;
}

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

.mt-24 {
  margin-top: 24px;
}

.mb-16 {
  margin-bottom: 16px;
}

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

/* Responsive */
@media (max-width: 900px) {
  .hero-grid,
  .band,
  .band.reverse,
  .featured-dl,
  .req-grid {
    grid-template-columns: 1fr;
  }

  .band.reverse .band-visual,
  .band.reverse .band-copy {
    order: initial;
  }

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

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

  .cap-grid,
  .platform-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.7rem;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 16px rgba(11, 61, 122, 0.08);
    gap: 4px;
  }

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

  .nav-links a {
    padding: 12px 14px;
  }

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

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

  .section {
    padding: 48px 0;
  }
}