/* ===== 基础配置 ===== */
:root {
  --color-bg: #0a0e17;
  --color-bg-light: #131820;
  --color-bg-card: #1a1f2e;
  --color-bg-card-hover: #222938;
  --color-primary: #d4af37;
  --color-primary-dark: #b8941f;
  --color-text: #e5e7eb;
  --color-text-dim: #9ca3af;
  --color-text-darker: #6b7280;
  --color-border: #2d3748;
  --color-shadow: rgba(0, 0, 0, 0.5);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius: 12px;
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-md: 0 4px 16px var(--color-shadow);
  --shadow-lg: 0 8px 32px var(--color-shadow);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

/* ===== 通用组件 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary), #f0d77a);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title.left {
  text-align: left;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-dim);
  font-size: 1.125rem;
  margin-bottom: 48px;
}

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

.btn-primary {
  background: var(--color-primary);
  color: #000;
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-block {
  display: block;
  width: 100%;
}

/* ===== 导航栏 ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #0a0e17;
  font-size: 1.35rem;
  font-weight: 800;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-size: 1.05rem;
  letter-spacing: 0.5px;
}

.brand-text em {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--color-text-darker);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

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

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

.nav-links a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.nav-links a:not(.nav-cta):hover::after,
.nav-links a:not(.nav-cta).active::after {
  width: 100%;
}

.nav-cta {
  padding: 9px 20px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #0a0e17 !important;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--color-primary-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

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

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 英雄区 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(212, 175, 55, 0.08), transparent 50%),
    radial-gradient(circle at 80% 50%, rgba(212, 175, 55, 0.05), transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--color-text);
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), #f0d77a);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--color-text-dim);
  margin-bottom: 32px;
}

.hero-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.hero-tags span {
  padding: 8px 18px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

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

/* ===== 服务卡片 ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}

.service-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  filter: grayscale(0.2);
}

.service-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: var(--color-text);
}

.service-card p {
  color: var(--color-text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== 为什么选择我们 ===== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin-bottom: 64px;
}

.why-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.why-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0;
  transition: var(--transition);
}

.why-card:hover::before {
  opacity: 1;
}

.why-card:hover {
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.why-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: 0.3;
  margin-bottom: 16px;
  line-height: 1;
}

.why-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: var(--color-text);
}

.why-card p {
  color: var(--color-text-dim);
  font-size: 0.95rem;
  line-height: 1.7;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  padding: 48px 0;
}

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

.stat-value {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-value::after {
  content: attr(data-suffix);
  font-size: 2rem;
  margin-left: 2px;
}

.stat-label {
  color: var(--color-text-dim);
  font-size: 1rem;
}

/* ===== 合作流程 ===== */
.process-line {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  position: relative;
}

.process-step {
  text-align: center;
  padding: 0 12px;
}

.process-dot {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  font-size: 1.35rem;
  font-weight: 800;
  transition: var(--transition);
}

.process-step:hover .process-dot {
  background: var(--color-primary);
  color: #0a0e17;
  transform: scale(1.08);
  box-shadow: 0 0 24px rgba(212, 175, 55, 0.35);
}

.process-step h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.process-step p {
  color: var(--color-text-dim);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ===== 关于我们 ===== */
.about-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  color: var(--color-text-dim);
  margin-bottom: 16px;
  line-height: 1.9;
}

.about-facts {
  list-style: none;
  margin-top: 32px;
  border-top: 1px solid var(--color-border);
}

.about-facts li {
  display: flex;
  gap: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.94rem;
}

.about-facts li span {
  flex: 0 0 150px;
  color: var(--color-text-darker);
}

.about-facts li strong {
  color: var(--color-text);
  font-weight: 600;
}

.license-frame {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 10px;
  background: var(--color-bg-card);
  box-shadow: var(--shadow-md);
}

.license-frame img {
  width: 100%;
  display: block;
  border-radius: 8px;
}

.license-cap {
  text-align: center;
  margin-top: 14px;
  color: var(--color-text-darker);
  font-size: 0.88rem;
}

/* ===== 常见问题 ===== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-card);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.open {
  border-color: var(--color-primary);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.05rem;
  font-weight: 600;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-primary);
  transition: transform 0.3s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

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

.faq-answer p {
  padding: 0 24px 22px;
  color: var(--color-text-dim);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3,
.contact-form h3 {
  font-size: 1.35rem;
  margin-bottom: 24px;
  color: var(--color-primary);
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}

.contact-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.contact-item strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.contact-item p {
  color: var(--color-text-dim);
  font-size: 0.92rem;
  line-height: 1.6;
}

.contact-item p a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: var(--transition);
}

.contact-item p a:hover {
  color: var(--color-primary);
}

.contact-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.12);
}

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

.form-note {
  text-align: center;
  margin-top: 14px;
  font-size: 0.85rem;
  color: var(--color-text-darker);
}

.form-status {
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  text-align: center;
  display: none;
}

.form-status.show {
  display: block;
}

.form-status.ok {
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  line-height: 1.7;
}

.form-status a {
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
}

/* ===== 页脚 ===== */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 56px 0 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand > p {
  margin-top: 16px;
  color: var(--color-text-darker);
  font-size: 0.9rem;
  letter-spacing: 2px;
}

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

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-col a {
  display: block;
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: var(--transition);
}

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

/* 页脚正文里的电话/邮箱链接保持行内，不撑成整行 */
.footer-col p a {
  display: inline;
  margin-bottom: 0;
  color: var(--color-text-dim);
  text-decoration: none;
}

.footer-col p a:hover {
  color: var(--color-primary);
}

.footer-col p {
  color: var(--color-text-darker);
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-bottom p {
  color: var(--color-text-darker);
  font-size: 0.85rem;
}

/* ===== 滚动入场动画 ===== */
[data-aos] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  [data-aos] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .about-inner,
  .contact-grid,
  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section-title.left {
    text-align: center;
  }

  .about-license {
    order: -1;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 75px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 24px 20px;
    transform: translateY(-130%);
    transition: transform 0.35s ease;
    box-shadow: var(--shadow-lg);
  }

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

  .nav-links a {
    padding: 14px 4px;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
  }

  .nav-links a:not(.nav-cta)::after {
    display: none;
  }

  .nav-cta {
    margin-top: 14px;
    border-bottom: none !important;
    text-align: center;
  }

  .brand-text em {
    display: none;
  }

  .section {
    padding: 56px 0;
  }

  .hero {
    min-height: auto;
    padding: 140px 20px 64px;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-desc {
    font-size: 1.05rem;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 36px;
  }

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

  .about-facts li {
    flex-direction: column;
    gap: 4px;
  }

  .about-facts li span {
    flex: none;
    font-size: 0.82rem;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .contact-form {
    padding: 24px 20px;
  }

  .hero-actions .btn {
    width: 100%;
  }
}