/* ========================================
   闫宝龙 - 商标申请服务网站
   Design: 深海藏蓝 + 琥珀金，专业法律服务机构风格
   ======================================== */

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

:root {
  --color-primary: #1B2A4A;
  --color-primary-light: #2C3E6B;
  --color-accent: #C8963E;
  --color-accent-light: #D4A854;
  --color-bg: #FAFBFD;
  --color-bg-alt: #F0F4F8;
  --color-text: #2D2D2D;
  --color-text-muted: #6B7280;
  --color-white: #FFFFFF;
  --color-border: #E5E7EB;
  --color-shadow: rgba(27, 42, 74, 0.08);
  --gradient-primary: linear-gradient(135deg, #1B2A4A 0%, #2C3E6B 100%);
  --gradient-accent: linear-gradient(135deg, #C8963E 0%, #D4A854 100%);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --header-height: 72px;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
  list-style: none;
}

/* --- Utility --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: 48px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.section-title .accent {
  color: var(--color-accent);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  height: var(--header-height);
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: 0 2px 20px rgba(27, 42, 74, 0.1);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.logo-name {
  position: relative;
}

.logo-r {
  font-size: 0.6em;
  position: relative;
  top: -0.8em;
  margin-left: 1px;
  color: var(--color-accent);
  font-weight: 700;
}

.logo-divider {
  color: var(--color-border);
  margin: 0 8px;
  font-weight: 300;
}

.logo-tag {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 0.938rem;
  color: var(--color-text);
  position: relative;
  padding: 4px 0;
  font-weight: 500;
}

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

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

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

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

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

.nav-cta:hover {
  background: var(--color-accent-light) !important;
  transform: translateY(-1px);
  color: var(--color-white) !important;
}

/* Mobile Menu */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition);
  border-radius: 2px;
}

.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 --- */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  margin-top: var(--header-height);
  background: var(--gradient-primary);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 40%, rgba(200, 150, 62, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 60% at 80% 60%, rgba(44, 62, 107, 0.4) 0%, transparent 70%);
  animation: heroBgShift 8s ease-in-out infinite alternate;
}

@keyframes heroBgShift {
  0% { opacity: 1; transform: scale(1); }
  100% { opacity: 0.85; transform: scale(1.05); }
}

.hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image:
    linear-gradient(30deg, #C8963E 12%, transparent 12.5%, transparent 87%, #C8963E 87.5%, #C8963E),
    linear-gradient(150deg, #C8963E 12%, transparent 12.5%, transparent 87%, #C8963E 87.5%, #C8963E),
    linear-gradient(30deg, #C8963E 12%, transparent 12.5%, transparent 87%, #C8963E 87.5%, #C8963E),
    linear-gradient(150deg, #C8963E 12%, transparent 12.5%, transparent 87%, #C8963E 87.5%, #C8963E),
    linear-gradient(60deg, rgba(200,150,62,0.3) 25%, transparent 25.5%, transparent 75%, rgba(200,150,62,0.3) 75%, rgba(200,150,62,0.3)),
    linear-gradient(60deg, rgba(200,150,62,0.3) 25%, transparent 25.5%, transparent 75%, rgba(200,150,62,0.3) 75%, rgba(200,150,62,0.3));
  background-size: 80px 140px;
  background-position: 0 0, 0 0, 40px 70px, 40px 70px, 0 0, 40px 70px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(200, 150, 62, 0.15);
  border: 1px solid rgba(200, 150, 62, 0.3);
  color: var(--color-accent-light);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
}

.hero-badge svg {
  width: 16px;
  height: 16px;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s 0.15s ease forwards;
  opacity: 0;
}

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

.hero-desc {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.75);
  max-width: 560px;
  line-height: 1.8;
  margin-bottom: 36px;
  animation: fadeInUp 0.8s 0.3s ease forwards;
  opacity: 0;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.45s ease forwards;
  opacity: 0;
}

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

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

.btn-primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(200, 150, 62, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.35);
}

.btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stats bar */
.hero-stats {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-stats-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: center;
  gap: 48px;
}

.stat-item {
  text-align: center;
  color: var(--color-white);
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-number .unit {
  font-size: 0.9rem;
  font-weight: 500;
  margin-left: 2px;
}

.stat-label {
  font-size: 0.813rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 4px;
}

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

.service-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
  transform-origin: left;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--color-shadow);
  border-color: transparent;
}

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

.service-icon {
  width: 52px;
  height: 52px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--color-accent);
  transition: all var(--transition);
}

.service-card:hover .service-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.service-icon svg {
  width: 26px;
  height: 26px;
}

.service-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.service-card p {
  font-size: 0.938rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

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

.adv-card {
  text-align: center;
  padding: 36px 20px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.adv-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--color-shadow);
}

.adv-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.adv-icon svg {
  width: 28px;
  height: 28px;
}

.adv-card h3 {
  font-size: 1.063rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.adv-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- Process --- */
.process-steps {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 60px;
  right: 60px;
  height: 2px;
  background: var(--color-border);
}

.process-step {
  flex: 1;
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 72px;
  height: 72px;
  margin: 0 auto 16px;
  background: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  transition: all var(--transition);
}

.process-step:hover .step-number {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-accent);
}

.step-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.step-desc {
  font-size: 0.813rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 56px;
  align-items: center;
}

.about-photo {
  position: relative;
}

.about-photo img {
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(27, 42, 74, 0.15);
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
}

.about-photo::after {
  content: '';
  position: absolute;
  bottom: -12px;
  right: -12px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-lg);
  z-index: -1;
}

.about-info h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.about-info .tagline {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 1.063rem;
  margin-bottom: 20px;
}

.about-info .desc {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
  font-size: 0.938rem;
}

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

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

.highlight-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  margin-top: 2px;
}

.highlight-item span {
  font-size: 0.938rem;
  color: var(--color-text);
  font-weight: 500;
  line-height: 1.5;
}

/* --- FAQ --- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--color-white);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: rgba(200, 150, 62, 0.3);
}

.faq-item.active {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(200, 150, 62, 0.1);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-primary);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  line-height: 1.5;
  gap: 16px;
  transition: color var(--transition);
}

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

.faq-arrow {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--color-accent);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.938rem;
  line-height: 1.8;
}

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

.contact-info h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.contact-info .desc {
  color: var(--color-text-muted);
  margin-bottom: 32px;
  line-height: 1.8;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-item-icon {
  width: 44px;
  height: 44px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-item-icon svg {
  width: 20px;
  height: 20px;
}

.contact-item-text .label {
  font-size: 0.813rem;
  color: var(--color-text-muted);
  margin-bottom: 2px;
}

.contact-item-text .value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.contact-item-text a:hover {
  color: var(--color-accent);
}

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

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

.contact-qr .qr-label {
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.contact-qr .qr-hint {
  font-size: 0.813rem;
  color: var(--color-text-muted);
}

/* --- Footer --- */
.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0 0;
}

.footer-links {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-links-title {
  font-size: 0.938rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 32px;
}

.footer-links-grid a {
  font-size: 0.813rem;
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition);
  line-height: 1.8;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 24px;
  text-align: center;
  font-size: 0.813rem;
  color: rgba(255, 255, 255, 0.4);
  max-width: var(--max-width);
  margin: 0 auto;
}

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

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

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(27, 42, 74, 0.3);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

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

.back-to-top svg {
  width: 20px;
  height: 20px;
}

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transform: translateY(-120%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .nav.open {
    transform: translateY(0);
  }

  .nav a {
    font-size: 1rem;
    padding: 8px 0;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero {
    min-height: 500px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

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

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

  .stat-number {
    font-size: 1.375rem;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

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

  .adv-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .process-steps {
    flex-direction: column;
    gap: 24px;
  }

  .process-steps::before {
    display: none;
  }

  .process-step {
    display: flex;
    text-align: left;
    align-items: center;
    gap: 16px;
  }

  .step-number {
    width: 56px;
    height: 56px;
    font-size: 1.25rem;
    margin: 0;
    flex-shrink: 0;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-photo {
    max-width: 280px;
    margin: 0 auto;
  }

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-links-grid {
    gap: 6px 16px;
  }

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

  .btn {
    padding: 12px 24px;
    font-size: 0.938rem;
  }
}

@media (max-width: 480px) {
  .adv-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .logo {
    font-size: 1.25rem;
  }

  .logo-tag {
    display: none;
  }

  .hero-stats-inner {
    gap: 16px;
  }
}