/* ================================================
   虎狼之师官网 - 主样式
   风格：极简 / 黑白灰 / 服装品牌感
   ================================================ */

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

:root {
  --black:      #111111;
  --dark:       #1F1F1F;
  --mid-gray:   #666666;
  --light-gray: #F5F5F5;
  --white:      #FFFFFF;
  --accent:     #8A8A8A;
  --border:     #E8E8E8;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
          "Helvetica Neue", Arial, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--black);
  background: var(--white);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ------------------------------------------------
   导航
   ------------------------------------------------ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  height: 64px;
  display: flex;
  align-items: center;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.nav-logo .logo-cn {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--black);
}

.nav-logo .logo-en {
  font-size: 10px;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--mid-gray);
  letter-spacing: 1px;
  transition: color 0.2s;
}

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

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--black);
  transition: all 0.3s;
}

/* ------------------------------------------------
   Hero
   ------------------------------------------------ */
.hero {
  min-height: 100vh;
  background: var(--dark);
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

/* 背景纹理层 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, #1a1a1a 0%, #111111 50%, #222222 100%);
  opacity: 0.95;
}

/* 装饰线条 */
.hero::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 40%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(138,138,138,0.04));
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
  animation: fadeInUp 0.8s ease both;
}

.hero-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(138,138,138,0.4);
  padding: 6px 14px;
  margin-bottom: 32px;
}

.hero-title {
  font-size: clamp(48px, 8vw, 88px);
  font-weight: 700;
  color: var(--white);
  letter-spacing: 6px;
  line-height: 1.1;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: clamp(13px, 2vw, 16px);
  letter-spacing: 4px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.55);
  line-height: 1.8;
  margin-bottom: 48px;
  max-width: 480px;
}

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

.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 14px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: all 0.25s;
  border: none;
  font-family: var(--font);
}

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

.btn-primary:hover {
  background: var(--light-gray);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255,255,255,0.05);
  transform: translateY(-1px);
}

/* 装饰数字 */
.hero-deco {
  position: absolute;
  right: 8%;
  bottom: 12%;
  font-size: 160px;
  font-weight: 900;
  color: rgba(255,255,255,0.025);
  letter-spacing: -8px;
  line-height: 1;
  user-select: none;
  z-index: 0;
}

/* ------------------------------------------------
   通用 Section
   ------------------------------------------------ */
.section {
  padding: 96px 0;
}

.section-label {
  font-size: 11px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--black);
  letter-spacing: 2px;
  margin-bottom: 24px;
  line-height: 1.3;
}

.section-divider {
  width: 40px;
  height: 2px;
  background: var(--black);
  margin-bottom: 40px;
}

/* ------------------------------------------------
   关于我们
   ------------------------------------------------ */
.about {
  background: var(--white);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

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

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

.stat-item {
  padding: 32px;
  background: var(--light-gray);
  text-align: center;
}

.stat-num {
  font-size: 36px;
  font-weight: 700;
  color: var(--black);
  letter-spacing: 2px;
  display: block;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 12px;
  color: var(--mid-gray);
  letter-spacing: 2px;
}

/* ------------------------------------------------
   业务版块
   ------------------------------------------------ */
.services {
  background: var(--light-gray);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.service-card {
  background: var(--white);
  padding: 48px 36px;
  transition: transform 0.25s, box-shadow 0.25s;
  cursor: default;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}

.service-icon {
  font-size: 32px;
  margin-bottom: 24px;
  display: block;
  line-height: 1;
}

.service-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 16px;
  color: var(--black);
}

.service-desc {
  font-size: 14px;
  color: var(--mid-gray);
  line-height: 1.9;
}

.service-list {
  list-style: none;
  margin-top: 20px;
}

.service-list li {
  font-size: 13px;
  color: var(--accent);
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  letter-spacing: 1px;
}

.service-list li:last-child {
  border-bottom: none;
}

/* ------------------------------------------------
   企业理念
   ------------------------------------------------ */
.philosophy {
  background: var(--black);
  text-align: center;
  padding: 120px 0;
}

.philosophy-quote {
  font-size: clamp(22px, 4vw, 36px);
  color: var(--white);
  font-weight: 300;
  letter-spacing: 6px;
  line-height: 1.6;
  max-width: 700px;
  margin: 0 auto 24px;
}

.philosophy-quote strong {
  font-weight: 700;
}

.philosophy-sub {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* ------------------------------------------------
   联系我们
   ------------------------------------------------ */
.contact {
  background: var(--white);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

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

.contact-item-icon {
  width: 40px;
  height: 40px;
  background: var(--light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.contact-item-body label {
  display: block;
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
}

.contact-item-body p {
  font-size: 15px;
  color: var(--dark);
}

.contact-right {
  padding: 48px;
  background: var(--light-gray);
}

.contact-right h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 16px;
  color: var(--black);
}

.contact-right p {
  font-size: 14px;
  color: var(--mid-gray);
  line-height: 1.8;
}

.working-hours {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.working-hours dt {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.working-hours dd {
  font-size: 14px;
  color: var(--mid-gray);
}

/* ------------------------------------------------
   Footer
   ------------------------------------------------ */
.site-footer {
  background: var(--dark);
  padding: 40px 0;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.footer-inner p {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 1px;
}

.footer-inner a {
  color: rgba(255,255,255,0.55);
  transition: color 0.2s;
}

.footer-inner a:hover {
  color: var(--white);
}

.footer-divider {
  width: 1px;
  height: 16px;
  background: rgba(255,255,255,0.15);
  display: inline-block;
  margin: 0 12px;
  vertical-align: middle;
}

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

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ------------------------------------------------
   响应式 - 平板
   ------------------------------------------------ */
@media (max-width: 900px) {
  .about-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .services-grid {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .contact-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ------------------------------------------------
   响应式 - 手机
   ------------------------------------------------ */
@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
  }

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

  .nav-links a {
    display: block;
    padding: 14px 24px;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
  }

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

  .nav-toggle {
    display: flex;
  }

  .hero-deco {
    display: none;
  }

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

  .services-grid {
    gap: 1px;
  }

  .service-card {
    padding: 36px 24px;
  }

  .philosophy {
    padding: 80px 0;
  }

  .section {
    padding: 64px 0;
  }

  .contact-right {
    padding: 32px 24px;
  }
}