/* ========================================
   闫宝龙 GEO优化 - 主样式表
   配色：深靛#1a2744 琥珀金#d4a04a 宣纸白#f8f7f4
   ======================================== */

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a2744;
  --primary-dark: #0f1a2e;
  --accent: #d4a04a;
  --accent-light: #f0e6d0;
  --bg-warm: #f8f7f4;
  --white: #ffffff;
  --text: #2d3748;
  --text-muted: #6b7a8d;
  --border: #e2ddd5;
  --shadow: rgba(26, 39, 68, 0.08);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s ease;
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg-warm);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--accent);
}

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

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px var(--shadow);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0;
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--primary);
  white-space: nowrap;
}

.logo-name {
  position: relative;
  letter-spacing: 0.02em;
}

.logo-r {
  font-size: 0.55em;
  position: relative;
  top: -0.7em;
  margin-left: 1px;
  font-weight: 400;
  color: var(--text-muted);
}

.logo-divider {
  margin: 0 10px;
  color: var(--border);
  font-weight: 300;
}

.logo-sub {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.925rem;
  color: var(--text);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  background: var(--accent) !important;
  color: var(--white) !important;
  padding: 8px 20px !important;
  border-radius: var(--radius);
  font-weight: 600 !important;
  font-size: 0.875rem !important;
  transition: all 0.25s ease !important;
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: #c4923e !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(212, 160, 74, 0.35);
}

/* Mobile menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--primary);
  margin: 5px 0;
  transition: all var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  background: linear-gradient(135deg, #1a2744 0%, #0f1a2e 40%, #1a2744 70%, #0f1a2e 100%);
  background-size: 300% 300%;
  animation: heroGradient 8s ease-in-out infinite;
  overflow: hidden;
}

@keyframes heroGradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(212, 160, 74, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 30%, rgba(212, 160, 74, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(212, 160, 74, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 160, 74, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  animation: heroFadeIn 1s ease-out;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-badge {
  display: inline-block;
  background: rgba(212, 160, 74, 0.15);
  color: var(--accent);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid rgba(212, 160, 74, 0.25);
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero h1 .highlight {
  color: var(--accent);
  position: relative;
}

.hero-desc {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
  gap: 8px;
}

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

.btn-primary:hover {
  background: #c4923e;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212, 160, 74, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
}

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

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-stat {
  text-align: center;
}

.hero-stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 4px;
}

/* ===== Section Common ===== */
.section {
  padding: 80px 24px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== Services ===== */
.services {
  background: var(--white);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 36px var(--shadow);
  border-color: rgba(212, 160, 74, 0.2);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 700;
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 10px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== Process ===== */
.process {
  background: var(--bg-warm);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.process-step {
  text-align: center;
  position: relative;
  padding: 32px 20px;
}

.step-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--accent);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  position: relative;
  z-index: 2;
}

.step-connector {
  position: absolute;
  top: 60px;
  right: -12px;
  width: 24px;
  height: 2px;
  background: var(--border);
}

.process-step:last-child .step-connector {
  display: none;
}

.process-step h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

.process-step p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== Advantages ===== */
.advantages {
  background: var(--white);
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.adv-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg-warm);
  transition: all 0.3s ease;
}

.adv-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 30px var(--shadow);
}

.adv-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  display: block;
}

.adv-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 10px;
}

.adv-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ===== About ===== */
.about {
  background: var(--primary);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 70% 30%, rgba(212, 160, 74, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.about-inner {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 56px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.about-photo-wrap {
  position: relative;
}

.about-photo {
  width: 100%;
  aspect-ratio: 3/4;
  border-radius: var(--radius-lg);
  object-fit: cover;
  border: 3px solid rgba(212, 160, 74, 0.3);
}

.about-photo-badge {
  position: absolute;
  bottom: -12px;
  right: -12px;
  background: var(--accent);
  color: var(--white);
  padding: 10px 16px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(212, 160, 74, 0.4);
}

.about-info .section-tag {
  color: var(--accent);
}

.about-info .section-title {
  color: var(--white);
  text-align: left;
  margin-bottom: 20px;
}

.about-text {
  color: rgba(255, 255, 255, 0.75);
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: 24px;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}

.about-highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.about-highlight-icon {
  color: var(--accent);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.about-highlight-text {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.85);
  font-weight: 500;
}

/* ===== FAQ ===== */
.faq {
  background: var(--bg-warm);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.active {
  border-color: var(--accent);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  font-family: inherit;
  line-height: 1.5;
  gap: 16px;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--accent);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: all var(--transition);
}

.faq-item.active .faq-icon {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* ===== Contact ===== */
.contact {
  background: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-warm);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--primary);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-item-text h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 4px;
}

.contact-item-text p {
  font-size: 1.05rem;
  color: var(--primary);
  font-weight: 600;
}

.contact-qr {
  text-align: center;
  padding: 32px;
  background: var(--bg-warm);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.contact-qr img {
  width: 200px;
  height: 200px;
  margin: 0 auto 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.contact-qr p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.6);
  padding: 48px 24px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links-section {
  margin-bottom: 32px;
}

.footer-links-title {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 500;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.footer-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-links-grid a {
  font-size: 0.825rem;
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition);
  padding: 2px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
  color: var(--accent);
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 999;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent);
  color: var(--white);
  transform: translateY(-2px);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .step-connector {
    display: none;
  }

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

  .about-inner {
    grid-template-columns: 240px 1fr;
    gap: 36px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px 24px;
    gap: 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px var(--shadow);
  }

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

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a::after {
    display: none;
  }

  .nav-cta {
    text-align: center !important;
    margin-top: 8px;
  }

  .mobile-toggle {
    display: block;
  }

  .hero {
    min-height: 500px;
    padding: 100px 20px 60px;
  }

  .hero h1 {
    font-size: 1.85rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-stats {
    gap: 24px;
    flex-wrap: wrap;
  }

  .hero-stat-num {
    font-size: 1.5rem;
  }

  .section {
    padding: 56px 20px;
  }

  .section-title {
    font-size: 1.75rem;
  }

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

  .process-steps {
    grid-template-columns: 1fr;
  }

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

  .about-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 32px;
  }

  .about-photo-wrap {
    max-width: 220px;
    margin: 0 auto;
  }

  .about-info .section-title {
    text-align: center;
  }

  .about-highlights {
    grid-template-columns: 1fr;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.55rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .logo {
    font-size: 1.1rem;
  }

  .logo-sub {
    font-size: 0.75rem;
  }
}