/* ============================================================
   Premium Visual Upgrade
   - Modern typography (system font stack)
   - Refined color palette (deep navy + warm gray)
   - Generous whitespace
   - Subtle shadows and clean cards
   ============================================================ */

:root {
  /* Override colors */
  --navy: #0c2744;
  --navy-dark: #071828;
  --navy-soft: #143d63;
  --ink: #111827;
  --ink-2: #374151;
  --muted: #6b7280;
  --mist: #f8fafc;
  --paper: #ffffff;
  --line: #e5e7eb;
  --line-soft: #f3f4f6;
  --gold: #9ca3af;
  --gold-soft: #d1d5db;
  
  /* Unified font stack: serif for headings, sans for body */
  --serif: "Source Han Serif SC", "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --display: "Source Han Serif SC", "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
}

/* --- Typography --- */
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  letter-spacing: 0.01em;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--ink);
}

h1 { font-size: 56px; }
h2 { font-size: 40px; }
h3 { font-size: 24px; }

.section-heading__en {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}

/* --- Header --- */
.site-header {
  border-bottom: 1px solid rgba(0,0,0,0.06);
}

.brand strong {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.brand small {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.main-nav {
  background: var(--navy);
}

.navbar-nav .nav-link {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 16px 18px;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
}

.hero__overlay {
  background: linear-gradient(135deg, rgba(7, 24, 40, 0.92) 0%, rgba(12, 39, 68, 0.78) 50%, rgba(20, 61, 99, 0.55) 100%);
}

.hero__eyebrow {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.25em;
  color: rgba(255,255,255,0.7);
}

.hero__eyebrow::before {
  background: rgba(255,255,255,0.4);
}

.hero h1 {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  max-width: 900px;
}

.hero p {
  font-size: 18px;
  line-height: 1.9;
  color: rgba(255,255,255,0.82);
  max-width: 680px;
  font-weight: 400;
}

.hero__actions {
  gap: 16px;
  margin-top: 48px;
}

.hero__actions .btn {
  height: 54px;
  border-radius: 4px;
  padding: 0 32px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.3s ease;
}

.hero__actions .btn-light {
  background: #fff;
  color: var(--navy);
  border: none;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.hero__actions .btn-light:hover {
  background: var(--navy);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

.hero__actions .btn-outline-light {
  border: 1px solid rgba(255,255,255,0.4);
  color: rgba(255,255,255,0.9);
}

.hero__actions .btn-outline-light:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  color: #fff;
}

.hero__badges {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 32px;
  margin-top: 48px;
}

.hero__badges span {
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.03em;
}

/* --- Sections --- */
.section {
  padding: 120px 0;
}

.section-heading {
  margin-bottom: 64px;
}

.section-heading h2 {
  margin-top: 16px;
}

/* --- Cards --- */
.business-card,
.service-card,
.advantage-card,
.process-card,
.news-card,
.detail-panel,
.testimonial-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.business-card:hover,
.service-card:hover,
.advantage-card:hover,
.process-card:hover,
.news-card:hover,
.detail-panel:hover,
.testimonial-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 48px rgba(12, 39, 68, 0.1);
  border-color: var(--line-soft);
}

.business-card__head {
  background: transparent;
  border-bottom: 1px solid var(--line);
  padding: 24px 28px;
}

.business-card__head h3 {
  font-size: 20px;
  font-weight: 700;
}

.business-card__body {
  padding: 28px;
}

.business-card__body p {
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.75;
}

.business-card li a {
  color: var(--ink-2);
  font-size: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: all 0.2s ease;
}

.business-card li a:hover {
  color: var(--navy);
  padding-left: 8px;
}

.business-card li a::before {
  display: none;
}

.service-card {
  padding: 36px 28px;
  text-align: center;
}

.service-card i {
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--mist);
  color: var(--navy);
  border-radius: 12px;
  font-size: 24px;
  margin-bottom: 20px;
}

.service-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

/* --- Buttons --- */
.btn-primary {
  background: var(--navy);
  border-color: var(--navy);
  border-radius: 4px;
  padding: 12px 28px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: var(--navy-dark);
  border-color: var(--navy-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(12, 39, 68, 0.2);
}

.btn-outline-primary {
  color: var(--navy);
  border-color: var(--navy);
  border-radius: 4px;
  padding: 12px 28px;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline-primary:hover {
  background: var(--navy);
  border-color: var(--navy);
  transform: translateY(-2px);
}

/* --- CTA Strip --- */
.cta-strip {
  background: var(--navy);
  padding: 80px 0;
}

.cta-strip h2 {
  font-size: 36px;
  font-weight: 700;
}

.cta-strip p {
  font-size: 17px;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
}

/* --- Achievements --- */
.achievement-section {
  padding: 80px 0;
  background: var(--mist);
}

.achievement-row {
  border: none;
  background: transparent;
  box-shadow: none;
}

.achievement-item {
  min-height: auto;
  padding: 32px 16px;
  border-right: 1px solid var(--line);
}

.achievement-item strong {
  font-size: 48px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -0.03em;
}

.achievement-item span {
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
}

.achievement-item p {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-top: 8px;
}

/* --- About --- */
.about-section {
  background: #fff;
}

.about-image {
  border-radius: 12px;
  box-shadow: 0 24px 48px rgba(12, 39, 68, 0.1);
}

.about-section p {
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-2);
  margin-bottom: 20px;
}

/* --- Footer --- */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.7);
}

.site-footer h3 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.site-footer a {
  color: rgba(255,255,255,0.65);
  font-size: 14px;
}

.site-footer a:hover {
  color: #fff;
}

/* --- Float contact --- */
.float-contact {
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
  border-radius: 8px 8px 0 0;
}

/* --- Responsive --- */
@media (max-width: 991.98px) {
  .section { padding: 80px 0; }
  .hero h1 { font-size: 44px; }
  h2 { font-size: 32px; }
  .achievement-item strong { font-size: 36px; }
}

@media (max-width: 575.98px) {
  .hero h1 { font-size: 32px; }
  .section { padding: 60px 0; }
  h2 { font-size: 28px; }
}

/* --- Phone prominence: 18642086018 as primary --- */
.phone-primary {
  font-weight: 700;
  font-size: 1.08em;
  letter-spacing: 0.02em;
}
.phone-secondary {
  font-weight: 400;
  font-size: 0.88em;
  opacity: 0.75;
}

/* Header CTA */
.consult-btn .phone-primary {
  font-size: 15px;
}

/* Footer hotline */
.footer-hotline {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}
.footer-hotline .phone-primary {
  font-size: 20px;
  color: #fff;
}
.footer-hotline .phone-secondary {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  margin-left: 4px;
}
.footer-hotline .phone-secondary::before {
  content: "/ ";
  color: rgba(255,255,255,0.4);
}

/* Footer WeChat card */
.footer-follow-card__phones {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-follow-card__phones .phone-primary {
  font-size: 16px;
  color: var(--navy);
}
.footer-follow-card__phones .phone-secondary {
  font-size: 13px;
  color: var(--muted);
}

/* Floating sidebar */
.float-contact .float-phone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  line-height: 1.3;
}
.float-contact .float-phone .phone-primary {
  font-size: 15px;
  margin-top: 2px;
}
.float-contact .float-phone .phone-secondary {
  font-size: 11px;
  opacity: 0.8;
}
.float-contact a i {
  font-size: 18px;
}

/* Service sidebar CTA */
.service-sidebar__card .btn-primary {
  font-size: 15px;
  font-weight: 700;
}
.service-sidebar__card .btn-outline-primary {
  font-size: 13px;
}

/* Contact page phone */
.detail-panel .phone-primary {
  font-size: 1.1em;
}
.detail-panel .phone-secondary {
  font-size: 0.95em;
}