/* ===== Variables ===== */
:root {
  --color-primary: #e31837;
  --color-primary-dark: #c01430;
  --color-primary-light: #ff4d6a;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fb;
  --color-bg-dark: #0d1117;
  --color-bg-dark-alt: #161b22;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-text-light: #9ca3af;
  --color-border: #e5e7eb;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--color-bg-dark);
  color: #fff;
}

.section-dark .section-tag {
  background: rgba(227, 24, 55, 0.15);
  color: var(--color-primary-light);
}

.section-dark .section-desc {
  color: var(--color-text-light);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.nav-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-menu a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding-top: 72px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(227, 24, 55, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(227, 24, 55, 0.05) 0%, transparent 50%),
    linear-gradient(180deg, #fff 0%, var(--color-bg-alt) 100%);
  z-index: 0;
}

.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(227, 24, 55, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(227, 24, 55, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 50%, black 20%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  animation: fadeUp 1s ease-out;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(227, 24, 55, 0.08);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 24px;
  letter-spacing: 0.05em;
  margin-bottom: 28px;
}

.hero-logo-wrap {
  margin-bottom: 32px;
}

.hero-logo {
  width: 120px;
  height: 120px;
  object-fit: contain;
  margin: 0 auto;
  filter: drop-shadow(0 8px 24px rgba(227, 24, 55, 0.2));
  animation: float 4s ease-in-out infinite;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: 0.06em;
}

.hero-tags {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
  line-height: 1.8;
}

.hero-desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

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

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-light);
  font-size: 0.8125rem;
  animation: fadeUp 1s ease-out 0.5s both;
}

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator::after {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  animation: scrollDown 2s ease-in-out infinite;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(227, 24, 55, 0.35);
}

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

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

.btn-full {
  width: 100%;
}

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(227, 24, 55, 0.08);
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 20px;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ===== Marquee ===== */
.marquee {
  background: var(--color-bg-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  overflow: hidden;
  padding: 18px 0;
}

.marquee-track {
  display: flex;
  gap: 48px;
  width: max-content;
  animation: marquee 30s linear infinite;
}

.marquee-track span {
  flex-shrink: 0;
  font-size: 0.9375rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.marquee-track span::before {
  content: "◆";
  margin-right: 12px;
  color: var(--color-primary);
  font-size: 0.625rem;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ===== Stats Banner ===== */
.stats-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  padding: 56px 0;
}

.stats-banner-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.stats-banner .stat-item {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
}

.stats-banner .stat-item:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: none;
}

.stats-banner .stat-number,
.stats-banner .stat-suffix {
  color: #fff;
}

.stats-banner .stat-label {
  color: rgba(255, 255, 255, 0.85);
}

/* ===== About ===== */
.about {
  background: var(--color-bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.about-card {
  background: var(--color-bg);
  padding: 40px 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}

.about-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(227, 24, 55, 0.15);
}

.about-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(227, 24, 55, 0.08);
  border-radius: 12px;
  margin-bottom: 24px;
  color: var(--color-primary);
}

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

.about-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.service-card {
  background: var(--color-bg-dark-alt);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 40px 32px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: rgba(227, 24, 55, 0.3);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

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

.service-card.featured {
  border-color: rgba(227, 24, 55, 0.25);
  background: linear-gradient(135deg, var(--color-bg-dark-alt) 0%, rgba(227, 24, 55, 0.08) 100%);
}

.service-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(227, 24, 55, 0.12);
  border-radius: 12px;
  margin-bottom: 24px;
  color: var(--color-primary-light);
}

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

.service-card h3 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.service-card > p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.service-list li {
  font-size: 0.875rem;
  color: #d1d5db;
  padding-left: 20px;
  position: relative;
}

.service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
}

/* ===== Advantages ===== */
.advantages {
  background: var(--color-bg-alt);
}

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

.advantage-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
}

.advantage-card:hover {
  transform: translateY(-4px);
  border-color: rgba(227, 24, 55, 0.2);
  box-shadow: var(--shadow-md);
}

.advantage-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(227, 24, 55, 0.08);
  border-radius: 12px;
  margin-bottom: 20px;
  color: var(--color-primary);
}

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

.advantage-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.advantage-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.stat-item {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
}

.stat-item:hover {
  border-color: rgba(227, 24, 55, 0.2);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.stat-suffix {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contact-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.contact-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(227, 24, 55, 0.12);
  border-radius: 12px;
  color: var(--color-primary-light);
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.contact-link {
  color: var(--color-primary-light);
  transition: color var(--transition);
}

.contact-link:hover {
  color: #fff;
  text-decoration: underline;
}

.contact-wechat {
  font-size: 1.25rem !important;
  font-weight: 700;
  color: #fff !important;
  letter-spacing: 0.05em;
}

.form-hint {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  text-align: center;
  line-height: 1.6;
}

.form-hint strong {
  color: #fff;
}

.contact-form {
  background: var(--color-bg-dark-alt);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: #d1d5db;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  color: #fff;
  font-family: inherit;
  font-size: 0.9375rem;
  transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-light);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(227, 24, 55, 0.05);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== Footer ===== */
.footer {
  background: #080b10;
  color: #fff;
  padding: 48px 0;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.125rem;
  font-weight: 700;
}

.footer-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.footer-slogan {
  font-size: 0.8125rem;
  color: rgba(227, 24, 55, 0.7);
  letter-spacing: 0.1em;
}

.footer-icp {
  margin-top: 4px;
}

.footer-icp a {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  transition: color var(--transition);
}

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

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes scrollDown {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

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

  .nav-menu a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu li:last-child a {
    border-bottom: none;
  }

  .hero-logo {
    width: 90px;
    height: 90px;
  }

  .services-grid,
  .about-grid,
  .advantages-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }

  .stats-banner-grid {
    grid-template-columns: 1fr 1fr;
  }

  .contact-form {
    padding: 28px;
  }
}

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

  .stat-number {
    font-size: 2.5rem;
  }
}