/* SET 1 — 深蓝商务官网 · 顶栏 + 宽 Hero + 横向能力带 */
:root {
  --navy: #0B3A6E;
  --blue: #1E6BB8;
  --blue-light: #3A8FD4;
  --blue-pale: #E8F2FA;
  --blue-mist: #D4E6F5;
  --bg-start: #F0F4F8;
  --bg-end: #E2EBF4;
  --ink: #0A2540;
  --ink-soft: #2C4A66;
  --muted: #5A7289;
  --white: #FFFFFF;
  --line: rgba(11, 58, 110, 0.14);
  --shadow: 0 12px 40px rgba(11, 58, 110, 0.12);
  --radius: 6px;
  --max: 1160px;
  --font-head: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Microsoft YaHei", "PingFang SC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg-start) 0%, var(--bg-end) 100%);
  background-attachment: fixed;
  line-height: 1.85;
  font-size: 16px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 8% 12%, rgba(30, 107, 184, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 92% 78%, rgba(11, 58, 110, 0.06) 0%, transparent 40%);
  z-index: -1;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--navy); }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; }

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

.container {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 2px 16px rgba(11, 58, 110, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
  padding: 14px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--navy);
  letter-spacing: 0.02em;
}

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

.main-nav ul {
  display: flex;
  gap: 4px;
}

.main-nav a {
  display: block;
  padding: 8px 20px;
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--navy);
  color: var(--white);
}

.header-cta { flex-shrink: 0; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--blue);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(30, 107, 184, 0.35);
}

.btn-primary:hover {
  background: var(--navy);
  box-shadow: 0 6px 20px rgba(11, 58, 110, 0.3);
}

.btn-outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.7);
  color: var(--white);
}

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

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

.btn-navy:hover { background: var(--blue); }

.btn-ghost {
  background: var(--blue-pale);
  color: var(--navy);
  border: 1px solid var(--line);
}

.btn-ghost:hover { background: var(--blue-mist); }

.btn-lg { padding: 14px 32px; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* Hero — wide business banner */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--navy) 0%, #0E4A82 50%, var(--blue) 100%);
  color: var(--white);
  padding: 80px 0 88px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(58, 143, 212, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container { position: relative; z-index: 1; }

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 22px;
}

.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4.5vw, 2.85rem);
  font-weight: 700;
  line-height: 1.28;
  max-width: 820px;
  margin-bottom: 24px;
}

.hero-lead {
  font-size: 1.08rem;
  line-height: 1.9;
  max-width: 780px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 36px;
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-stat strong {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.hero-stat span {
  font-size: 0.88rem;
  opacity: 0.82;
}

/* Section */
.section {
  padding: 72px 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.55);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-label {
  display: inline-block;
  padding: 4px 14px;
  background: var(--blue-pale);
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 3px;
  margin-bottom: 14px;
}

.section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--navy);
  margin-bottom: 14px;
}

.section-head p {
  color: var(--muted);
  font-size: 1rem;
}

/* Capability strip — horizontal band */
.capability-strip {
  background: var(--white);
  border-top: 3px solid var(--blue);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
  margin-top: -36px;
  position: relative;
  z-index: 2;
}

.capability-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

.cap-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 28px 24px;
  border-right: 1px solid var(--line);
  transition: background 0.2s;
}

.cap-item:last-child { border-right: none; }
.cap-item:hover { background: var(--blue-pale); }

.cap-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  color: var(--blue);
}

.cap-item h3 {
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 6px;
}

.cap-item p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: 0 4px 20px rgba(11, 58, 110, 0.05);
  transition: box-shadow 0.25s, border-color 0.25s;
}

.feature-card:hover {
  box-shadow: var(--shadow);
  border-color: rgba(30, 107, 184, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  color: var(--blue);
  margin-bottom: 18px;
}

.feature-card h3 {
  font-size: 1.12rem;
  color: var(--navy);
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.feature-card p:last-child { margin-bottom: 0; }

/* Deep dive */
.dive-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.dive-block {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 32px;
  border: 1px solid var(--line);
}

.dive-block h3 {
  font-size: 1.15rem;
  color: var(--navy);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--blue-pale);
}

.dive-block p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.dive-block ul {
  margin-top: 12px;
}

.dive-block li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 0.93rem;
}

.dive-block li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--blue);
  border-radius: 50%;
}

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

.platform-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 22px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.platform-card svg {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  color: var(--navy);
}

.platform-card h3 {
  font-size: 1.05rem;
  color: var(--navy);
  margin-bottom: 10px;
}

.platform-card p {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 18px;
  line-height: 1.65;
}

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

.stat-box {
  background: linear-gradient(145deg, var(--navy) 0%, var(--blue) 100%);
  color: var(--white);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
}

.stat-box .num {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 8px;
}

.stat-box .label {
  font-size: 0.9rem;
  opacity: 0.88;
}

.stat-desc {
  margin-top: 36px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.stat-desc p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.stat-desc p:last-child { margin-bottom: 0; }

/* Compare table */
.compare-wrap {
  overflow-x: auto;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(11, 58, 110, 0.05);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

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

.compare-table th:first-child { border-radius: var(--radius) 0 0 0; }
.compare-table tr:last-child td { border-bottom: none; }
.compare-table tr:nth-child(even) td { background: var(--blue-pale); }
.compare-table td:first-child { font-weight: 600; color: var(--navy); }

.compare-note {
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--blue-pale);
  border-left: 4px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.compare-note p {
  color: var(--ink-soft);
  font-size: 0.93rem;
  margin: 0;
}

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

.testimonial-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
}

.testimonial-card::before {
  content: "\201C";
  position: absolute;
  top: 12px;
  right: 20px;
  font-size: 3rem;
  color: var(--blue-pale);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-card p {
  color: var(--ink-soft);
  font-size: 0.93rem;
  margin-bottom: 18px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--blue-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue);
  font-weight: 700;
  font-size: 0.85rem;
}

.author-info strong {
  display: block;
  font-size: 0.9rem;
  color: var(--navy);
}

.author-info span {
  font-size: 0.8rem;
  color: var(--muted);
}

/* FAQ */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
}

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

.faq-item p {
  padding: 18px 24px;
  color: var(--ink-soft);
  font-size: 0.93rem;
  margin: 0;
}

/* Download page */
.download-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: var(--white);
  padding: 64px 0 72px;
  text-align: center;
}

.download-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  margin-bottom: 16px;
}

.download-hero p {
  max-width: 680px;
  margin: 0 auto 28px;
  opacity: 0.92;
  font-size: 1.02rem;
}

.download-main {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  margin-top: -40px;
  position: relative;
  z-index: 2;
}

.download-panel {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
}

.download-panel h2 {
  font-size: 1.25rem;
  color: var(--navy);
  margin-bottom: 16px;
}

.download-panel p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.download-btns {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.download-btns .btn { justify-content: flex-start; }

.version-info {
  background: var(--blue-pale);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-top: 20px;
}

.version-info li {
  font-size: 0.9rem;
  color: var(--ink-soft);
  padding: 6px 0;
  border-bottom: 1px dashed var(--line);
}

.version-info li:last-child { border-bottom: none; }

.step-list {
  counter-reset: step;
}

.step-item {
  display: flex;
  gap: 20px;
  margin-bottom: 28px;
  align-items: flex-start;
}

.step-item::before {
  counter-increment: step;
  content: counter(step);
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--navy);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.step-item h3 {
  font-size: 1.05rem;
  color: var(--navy);
  margin-bottom: 8px;
}

.step-item p {
  color: var(--ink-soft);
  font-size: 0.93rem;
  margin: 0;
}

.req-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.req-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.req-card h3 {
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.req-card li {
  font-size: 0.9rem;
  color: var(--ink-soft);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
}

.req-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 5px;
  height: 5px;
  background: var(--blue);
  border-radius: 50%;
}

.changelog {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.changelog h3 {
  font-size: 1.05rem;
  color: var(--navy);
  margin-bottom: 14px;
}

.changelog ul { margin-left: 0; }

.changelog li {
  font-size: 0.93rem;
  color: var(--ink-soft);
  padding: 8px 0 8px 20px;
  position: relative;
  border-bottom: 1px solid var(--line);
}

.changelog li:last-child { border-bottom: none; }

.changelog li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 8px;
  height: 8px;
  background: var(--blue);
  border-radius: 2px;
}

/* Guide page */
.guide-hero {
  background: linear-gradient(135deg, var(--navy) 0%, #0E4A82 100%);
  color: var(--white);
  padding: 60px 0 68px;
}

.guide-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3.5vw, 2.3rem);
  margin-bottom: 16px;
}

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

.guide-content {
  max-width: 820px;
  margin: 0 auto;
}

.guide-content h2 {
  font-family: var(--font-head);
  font-size: 1.45rem;
  color: var(--navy);
  margin: 48px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--blue-pale);
}

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

.guide-content h3 {
  font-size: 1.12rem;
  color: var(--blue);
  margin: 28px 0 12px;
}

.guide-content p {
  color: var(--ink-soft);
  font-size: 0.96rem;
  margin-bottom: 14px;
}

.guide-content ul {
  margin: 12px 0 18px 0;
}

.guide-content li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.guide-content li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--blue);
  border-radius: 50%;
}

.guide-cta {
  margin: 48px 0;
  padding: 40px 36px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  border-radius: var(--radius);
  text-align: center;
  color: var(--white);
}

.guide-cta h2 {
  color: var(--white);
  border-bottom: none;
  margin: 0 0 14px;
  padding: 0;
  font-size: 1.5rem;
}

.guide-cta p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 560px;
  margin: 0 auto 24px;
}

.guide-cta .btn-primary {
  background: var(--white);
  color: var(--navy);
}

.guide-cta .btn-primary:hover {
  background: var(--blue-pale);
}

.tip-box {
  background: var(--blue-pale);
  border-left: 4px solid var(--blue);
  padding: 18px 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 20px 0;
}

.tip-box p {
  margin: 0;
  font-size: 0.93rem;
}

/* Footer */
.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.82);
  padding: 40px 0 32px;
  margin-top: 48px;
}

.footer-inner {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

.footer-verify {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 22px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  margin-bottom: 24px;
}

.footer-verify svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: #6ECB8F;
}

.footer-verify strong {
  display: block;
  color: var(--white);
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.footer-verify span {
  font-size: 0.88rem;
  opacity: 0.85;
}

.footer-copy {
  font-size: 0.82rem;
  opacity: 0.72;
  line-height: 1.7;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.88rem;
}

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

/* Responsive */
@media (max-width: 960px) {
  .capability-inner { grid-template-columns: repeat(2, 1fr); }
  .cap-item:nth-child(2) { border-right: none; }
  .cap-item:nth-child(1),
  .cap-item:nth-child(2) { border-bottom: 1px solid var(--line); }
  .feature-grid,
  .dive-layout,
  .platform-row,
  .stats-band,
  .testimonial-grid,
  .download-main,
  .req-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; }
}

@media (max-width: 600px) {
  .capability-inner { grid-template-columns: 1fr; }
  .cap-item { border-right: none; border-bottom: 1px solid var(--line); }
  .cap-item:last-child { border-bottom: none; }
  .hero-stats { gap: 24px; }
}