/* Set 1 — Corporate Navy */
:root {
  --navy: #0B1F3A;
  --navy-deep: #071526;
  --navy-mid: #132d52;
  --navy-soft: #1a3a66;
  --gold: #C9A227;
  --gold-hover: #d4b03a;
  --gold-muted: #a8861f;
  --light: #f7f8fa;
  --soft-gray: #eef1f5;
  --text: #1a2332;
  --text-muted: #4a5568;
  --white: #ffffff;
  --border: #d8dee8;
  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --max: 1100px;
  --nav-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--gold-muted);
}

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

/* —— Nav —— */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--navy);
  border-bottom: 2px solid var(--gold);
  display: flex;
  align-items: center;
}

.site-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand svg {
  flex-shrink: 0;
}

.brand span {
  color: var(--gold);
}

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

.nav-links a {
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover {
  color: var(--gold);
}

.nav-links a.active {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* —— Hero —— */
.hero {
  background: linear-gradient(165deg, var(--navy-deep) 0%, var(--navy) 42%, var(--navy-mid) 100%);
  color: var(--white);
  padding: 72px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 85% 20%, rgba(201, 162, 39, 0.12), transparent 60%),
    radial-gradient(ellipse 40% 40% at 10% 80%, rgba(26, 58, 102, 0.5), transparent 55%);
  pointer-events: none;
}

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

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 18px;
  max-width: 720px;
}

.hero .lead {
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.88);
  max-width: 640px;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 20px;
}

.hero-note {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.65);
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
  line-height: 1.4;
}

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

.btn-primary {
  background: var(--gold);
  color: var(--navy-deep);
  border-color: var(--gold);
}

.btn-primary:hover:not(:disabled) {
  background: var(--gold-hover);
  border-color: var(--gold-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.45);
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--gold);
  color: var(--gold);
}

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

.btn-navy:hover:not(:disabled) {
  background: var(--navy-mid);
  border-color: var(--navy-mid);
  transform: translateY(-1px);
}

.btn-gold-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--gold);
}

.btn-gold-outline:hover:not(:disabled) {
  background: var(--gold);
  color: var(--navy-deep);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.92rem;
}

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

/* —— Sections / bands —— */
.band {
  padding: 64px 0;
}

.band-light {
  background: var(--light);
}

.band-gray {
  background: var(--soft-gray);
}

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

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

.band-navy .section-title,
.band-navy .section-desc {
  color: var(--white);
}

.band-navy .section-desc {
  color: rgba(255, 255, 255, 0.8);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 2.8vw, 1.9rem);
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.35;
}

.section-desc {
  color: var(--text-muted);
  max-width: 780px;
  margin-bottom: 36px;
  font-size: 1.02rem;
}

.prose p {
  margin-bottom: 1em;
  color: var(--text);
}

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

/* —— Feature accent blocks (NOT cards) —— */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feature-block {
  border-left: 4px solid var(--gold);
  padding: 22px 0 22px 28px;
  border-bottom: 1px solid var(--border);
}

.feature-block:last-child {
  border-bottom: none;
}

.feature-block h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--navy);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-block h3 svg {
  width: 22px;
  height: 22px;
  color: var(--gold);
  flex-shrink: 0;
}

.feature-block p {
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* —— Deep feature rows —— */
.deep-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 768px) {
  .deep-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px 48px;
  }
}

.deep-item h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--navy);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--gold);
  display: inline-block;
}

.deep-item p {
  color: var(--text-muted);
  font-size: 0.97rem;
}

/* —— Stats / data —— */
.stats-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 640px) {
  .stats-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stat-block {
  border-left: 4px solid var(--gold);
  padding-left: 20px;
}

.stat-block .num {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--navy);
  font-weight: 700;
  line-height: 1.2;
}

.stat-block .label {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 6px;
}

.band-navy .stat-block .num {
  color: var(--gold);
}

.band-navy .stat-block .label {
  color: rgba(255, 255, 255, 0.75);
}

/* —— Platform download —— */
.platform-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .platform-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.platform-block {
  border-left: 4px solid var(--gold);
  padding: 16px 0 16px 20px;
  background: transparent;
}

.platform-block h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--navy);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.band-navy .platform-block h3 {
  color: var(--white);
}

.platform-block h3 svg {
  width: 20px;
  height: 20px;
  color: var(--gold);
}

.platform-block p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  min-height: 2.8em;
}

.band-navy .platform-block p {
  color: rgba(255, 255, 255, 0.72);
}

.band-navy .platform-block {
  border-left-color: var(--gold);
}

/* —— Compare table —— */
.compare-wrap {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

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

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

.compare-table th:first-child {
  border-left: 4px solid var(--gold);
}

.compare-table tr:nth-child(even) td {
  background: rgba(11, 31, 58, 0.03);
}

.compare-table td:first-child {
  font-weight: 600;
  color: var(--navy);
}

/* —— Testimonials —— */
.quote-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.quote-block {
  border-left: 4px solid var(--gold);
  padding: 24px 0 24px 28px;
  border-bottom: 1px solid var(--border);
}

.quote-block:last-child {
  border-bottom: none;
}

.quote-block blockquote {
  font-size: 1.02rem;
  color: var(--text);
  margin-bottom: 12px;
  font-style: italic;
}

.quote-block cite {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* —— FAQ —— */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-list details {
  border-left: 4px solid var(--gold);
  background: transparent;
  padding: 0;
}

.faq-list summary {
  cursor: pointer;
  padding: 16px 20px;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--navy);
  font-size: 1.02rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  color: var(--gold);
  font-size: 1.3rem;
  font-weight: 400;
  flex-shrink: 0;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details .faq-body {
  padding: 0 20px 18px;
  color: var(--text-muted);
  font-size: 0.97rem;
}

.faq-list details .faq-body p {
  margin-bottom: 0.75em;
}

.faq-list details .faq-body p:last-child {
  margin-bottom: 0;
}

/* —— Steps —— */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step;
}

.step-item {
  border-left: 4px solid var(--gold);
  padding: 20px 0 20px 28px;
  border-bottom: 1px solid var(--border);
  counter-increment: step;
  position: relative;
}

.step-item:last-child {
  border-bottom: none;
}

.step-item h3 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  color: var(--navy);
  margin-bottom: 8px;
}

.step-item h3::before {
  content: counter(step) ". ";
  color: var(--gold);
}

.step-item p {
  color: var(--text-muted);
  font-size: 0.97rem;
}

/* —— Requirements —— */
.req-list {
  list-style: none;
}

.req-list li {
  border-left: 4px solid var(--gold);
  padding: 14px 0 14px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

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

.req-list li strong {
  color: var(--navy);
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
}

/* —— Version / changelog —— */
.version-block {
  border-left: 4px solid var(--gold);
  padding: 18px 0 18px 24px;
  border-bottom: 1px solid var(--border);
}

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

.version-block h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  color: var(--navy);
  margin-bottom: 8px;
}

.version-block .meta {
  font-size: 0.85rem;
  color: var(--gold-muted);
  margin-bottom: 8px;
}

.version-block p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* —— Article (zh-cn) —— */
.article-hero {
  padding-bottom: 48px;
}

.article {
  max-width: 800px;
}

.article h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  color: var(--navy);
  margin: 2.2em 0 0.7em;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--gold);
}

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

.article h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--navy-mid);
  margin: 1.6em 0 0.55em;
}

.article p {
  margin-bottom: 1.1em;
  color: var(--text);
}

.article ul {
  margin: 0 0 1.2em 1.4em;
  color: var(--text-muted);
}

.article li {
  margin-bottom: 0.45em;
}

.cta-box {
  margin: 40px 0;
  border-left: 4px solid var(--gold);
  padding: 24px 28px;
  background: var(--soft-gray);
}

.cta-box p {
  margin-bottom: 16px;
  color: var(--text);
}

.cta-box a.btn {
  text-decoration: none;
}

/* —— Download featured —— */
.download-featured {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

@media (min-width: 768px) {
  .download-featured {
    flex-direction: row;
    align-items: flex-start;
    gap: 48px;
  }
}

.download-featured .main-dl {
  flex: 1;
}

.download-featured .side-info {
  flex: 1;
}

.download-featured .side-info h3 {
  font-family: var(--font-display);
  color: var(--navy);
  margin-bottom: 12px;
  font-size: 1.15rem;
}

.download-featured .side-info p {
  color: var(--text-muted);
  margin-bottom: 1em;
  font-size: 0.97rem;
}

/* —— Footer —— */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.78);
  padding: 48px 0 36px;
  border-top: 2px solid var(--gold);
}

.site-footer .footer-brand {
  font-family: var(--font-display);
  color: var(--gold);
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.site-footer p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 820px;
}

.site-footer .footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 20px 0 24px;
}

.site-footer .footer-nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

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

.site-footer .copyright {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
}

/* —— Utilities —— */
.mb-0 { margin-bottom: 0; }
.mt-24 { margin-top: 24px; }
.text-center { text-align: center; }

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

/* —— Responsive —— */
@media (max-width: 640px) {
  .nav-links a {
    padding: 8px 10px;
    font-size: 0.88rem;
  }

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

  .band {
    padding: 48px 0;
  }

  .feature-block,
  .quote-block,
  .step-item {
    padding-left: 18px;
  }
}