/* ============================================================
   Premium Visual Upgrade — Refined Edition
   - Elevated typography (serif headings, refined sans body)
   - Deep navy + warm bronze accent palette
   - Generous whitespace and refined card shadows
   - Consistent, understated motion
   ============================================================ */

:root {
  /* Refined color palette */
  --navy: #0a1f35;
  --navy-dark: #061320;
  --navy-soft: #123450;
  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #64748b;
  --mist: #f8fafc;
  --paper: #ffffff;
  --line: #e2e8f0;
  --line-soft: #f1f5f9;
  --gold: #b8956a;
  --gold-soft: #d4b896;
  --gold-deep: #8f6f47;

  /* Typography: serif for authority, sans for clarity */
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

/* --- Base typography --- */
html { font-size: 16px; }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--ink);
}

h1 { font-size: clamp(38px, 5vw, 64px); }
h2 { font-size: clamp(30px, 3.5vw, 44px); }
h3 { font-size: clamp(22px, 2.2vw, 28px); }

p { margin-bottom: 1.25em; }

/* --- English labels --- */
.section-heading__en,
.hero__eyebrow,
.page-hero__en {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--gold);
  text-transform: uppercase;
}

.section-heading__en {
  color: var(--gold-deep);
  margin-bottom: 12px;
}

/* --- Header --- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
}

.header-top {
  min-height: 84px;
}

.brand strong {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
}

.brand small {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.consult-btn {
  height: 44px;
  padding: 0 22px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  background: var(--navy);
  border-color: var(--navy);
  transition: all 0.3s ease;
}

.consult-btn:hover {
  background: var(--navy-soft);
  border-color: var(--navy-soft);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(10, 31, 53, 0.18);
}

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

.main-nav .nav-link {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: 18px 22px;
  color: rgba(255, 255, 255, 0.82);
  transition: color 0.25s ease;
}

.main-nav .nav-link:hover,
.main-nav .nav-link.active {
  color: #fff;
}

.main-nav .nav-link::after {
  left: 22px;
  right: 22px;
  bottom: 14px;
  height: 2px;
  background: var(--gold);
  transition: transform 0.3s ease;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero__overlay {
  background: linear-gradient(
    135deg,
    rgba(6, 19, 32, 0.94) 0%,
    rgba(10, 31, 53, 0.82) 50%,
    rgba(18, 52, 80, 0.62) 100%
  );
}

.hero__eyebrow {
  color: var(--gold-soft);
  margin-bottom: 24px;
}

.hero h1 {
  font-family: var(--display);
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.12;
  max-width: 900px;
  color: #fff;
}

.hero p {
  font-size: 18px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.78);
  max-width: 640px;
  font-weight: 400;
  margin-top: 28px;
}

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

.hero__actions .btn {
  height: 54px;
  border-radius: 6px;
  padding: 0 32px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.hero__actions .btn-light {
  background: #fff;
  color: var(--navy);
  border: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.hero__actions .btn-light:hover {
  background: var(--gold);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
}

.hero__actions .btn-outline-light {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: rgba(255, 255, 255, 0.9);
  background: transparent;
}

.hero__actions .btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}

.hero__badges {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 32px;
  margin-top: 52px;
}

.hero__badges span {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.02em;
}

/* --- Page hero --- */
.page-hero {
  padding: 120px 0 100px;
  background: var(--navy);
}

.page-hero h1 {
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
}

.page-hero p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.72);
  max-width: 680px;
  margin-top: 20px;
}

.page-hero__en {
  color: var(--gold-soft);
  margin-bottom: 16px;
}

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

.section-heading {
  margin-bottom: 72px;
}

.section-heading h2 {
  margin-top: 14px;
  font-weight: 600;
}

.section-heading__subtitle {
  font-size: 17px;
  color: var(--muted);
  max-width: 720px;
  margin: 20px auto 0;
  line-height: 1.8;
}

/* --- Cards --- */
.business-card,
.service-card,
.advantage-card,
.process-card,
.news-card,
.detail-panel,
.testimonial-card,
.capability-card,
.stage-simple__card,
.credential-item,
.tldr-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  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,
.capability-card:hover,
.stage-simple__card:hover,
.credential-item:hover,
.tldr-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(10, 31, 53, 0.1);
  border-color: var(--line-soft);
}

.business-card__head {
  background: transparent;
  border-bottom: 1px solid var(--line);
  padding: 26px 30px;
}

.business-card__head h3 {
  font-size: 20px;
  font-weight: 600;
}

.business-card__body {
  padding: 30px;
}

.business-card__body p {
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.8;
}

.business-card li a {
  color: var(--ink-2);
  font-size: 14px;
  font-weight: 500;
  padding: 12px 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: 40px 32px;
  text-align: center;
}

.service-card i {
  width: 64px;
  height: 64px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--mist);
  color: var(--navy);
  border-radius: 16px;
  font-size: 26px;
  margin-bottom: 22px;
  transition: all 0.35s ease;
}

.service-card:hover i {
  background: var(--navy);
  color: #fff;
  transform: scale(1.05);
}

.service-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
}

/* --- Buttons --- */
.btn-primary,
.btn-outline-primary,
.btn-light,
.btn-outline-light,
.consult-btn {
  border-radius: 6px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.btn-primary {
  background: var(--navy);
  border-color: var(--navy);
  padding: 12px 28px;
  font-size: 14px;
}

.btn-primary:hover {
  background: var(--navy-soft);
  border-color: var(--navy-soft);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(10, 31, 53, 0.18);
}

.btn-outline-primary {
  color: var(--navy);
  border-color: var(--navy);
  padding: 12px 28px;
  font-size: 14px;
}

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

/* --- CTA Strip --- */
.cta-strip {
  background: var(--navy);
  padding: 100px 0;
}

.cta-strip h2 {
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 600;
  color: #fff;
}

.cta-strip p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
  max-width: 640px;
  margin: 20px auto 0;
}

/* --- Achievements --- */
.achievement-section {
  padding: 100px 0;
  background: var(--mist);
}

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

.achievement-item {
  min-height: auto;
  padding: 36px 20px;
  border-right: 1px solid var(--line);
}

.achievement-item:last-child {
  border-right: none;
}

.achievement-item strong {
  font-family: var(--display);
  font-size: 44px;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.02em;
}

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

.achievement-item p {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-top: 10px;
}

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

.about-image {
  border-radius: 14px;
  box-shadow: 0 24px 48px rgba(10, 31, 53, 0.1);
}

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

/* --- Process cards --- */
.process-card {
  padding: 36px 32px;
  text-align: center;
}

.process-card .step-number {
  font-family: var(--display);
  font-size: 48px;
  font-weight: 600;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 18px;
}

.process-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.process-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
}

/* --- News cards --- */
.news-card {
  overflow: hidden;
}

.news-card h3 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 12px;
}

.news-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
}

.news-card .news-date {
  font-size: 12px;
  color: var(--gold-deep);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

/* --- Detail panel --- */
.detail-panel {
  padding: 36px;
}

.detail-panel h2 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

/* --- TLDR card --- */
.tldr-card {
  padding: 36px;
  background: var(--mist);
  border: 1px solid var(--line);
}

.tldr-card h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--navy);
}

.tldr-card p {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.85;
}

/* --- AI fact box --- */
.ai-fact-box {
  background: var(--mist);
  border-left: 3px solid var(--gold);
  border-radius: 0 12px 12px 0;
  padding: 28px 32px;
  margin-bottom: 40px;
}

.ai-fact-box strong {
  color: var(--navy);
  font-weight: 600;
}

.ai-fact-box span {
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.75;
}

/* --- Footer --- */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255, 255, 255, 0.65);
  padding-top: 0;
}

.footer-contact {
  padding: 56px 0 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-contact > div span {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.footer-contact a {
  color: #fff;
  font-family: var(--sans);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.25s ease;
}

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

.site-footer h3 {
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 22px;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.62);
  font-size: 14px;
  line-height: 1.9;
  transition: color 0.2s ease;
}

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

.footer-follow-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(184, 149, 106, 0.15);
  border-radius: 14px;
  padding: 24px;
}

.footer-follow-card__head {
  color: var(--gold);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-follow-card__phones {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.footer-follow-card__phones a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 0.88);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.footer-follow-card__phones a:hover {
  background: rgba(184, 149, 106, 0.15);
  color: #fff;
  transform: translateX(2px);
}

.footer-follow-card__phones a i {
  color: var(--gold);
  font-size: 13px;
}

.footer-bottom {
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.45);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom a:hover {
  color: rgba(255, 255, 255, 0.75);
}

/* --- Float contact --- */
.float-contact {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.14);
  border-radius: 10px 10px 0 0;
  overflow: hidden;
}

.float-contact a {
  background: var(--navy);
  border-color: rgba(255, 255, 255, 0.08);
  transition: all 0.25s ease;
}

.float-contact a:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: #fff;
}

.float-contact i {
  font-size: 20px;
  margin-bottom: 6px;
}

.float-phone-label,
.float-phone-number {
  display: block;
  font-size: 12px;
  line-height: 1.4;
}

.float-phone-number {
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* --- Phone uniformity --- */
.phone-primary,
.phone-secondary {
  font-size: inherit;
  font-weight: 500;
  color: inherit;
}

/* --- Responsive --- */
@media (max-width: 991.98px) {
  .section { padding: 88px 0; }
  .page-hero { padding: 96px 0 80px; }
  .achievement-item { border-right: none; border-bottom: 1px solid var(--line); }
  .achievement-item:last-child { border-bottom: none; }
}

@media (max-width: 767.98px) {
  .section { padding: 72px 0; }
  .hero__actions .btn { padding: 0 22px; height: 48px; font-size: 13px; }
  .footer-contact { grid-template-columns: 1fr; gap: 28px; }
  .footer-contact a { font-size: 22px; }
}

@media (max-width: 575.98px) {
  .section { padding: 60px 0; }
  .hero h1 { font-size: 34px; }
  .section-heading { margin-bottom: 48px; }
  .detail-panel { padding: 24px; }
}