/* =========================================================
   Join Us Tech 酌尔科技官网样式表
   初版，采用 CSS 变量以便后续快速调整品牌色与间距
   ========================================================= */

/* ---------- 设计令牌 / CSS 变量 ---------- */
:root {
  /* 色彩系统 */
  --color-bg: #0a0f1c;
  --color-bg-soft: #0f1629;
  --color-bg-card: rgba(255, 255, 255, 0.03);
  --color-bg-card-hover: rgba(255, 255, 255, 0.06);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.16);
  --color-text: #e8eaf2;
  --color-text-muted: #9aa3b2;
  --color-text-dark: #1a1f2e;
  --color-light: #f7f9fc;
  --color-light-muted: #5a6478;

  /* 强调色：青蓝渐变 */
  --accent-cyan: #00e5ff;
  --accent-blue: #2979ff;
  --accent-green: #00e676;
  --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
  --gradient-subtle: linear-gradient(135deg, rgba(0, 229, 255, 0.12) 0%, rgba(41, 121, 255, 0.12) 100%);

  /* 字体系统 */
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --font-display: var(--font-sans);
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* 间距系统 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* 布局 */
  --container-max: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  /* 动效 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #fff;
  text-decoration: underline;
}

h1, h2, h3, h4, h5, h6, p {
  margin-top: 0;
}

ul, ol {
  margin: 0;
  padding-left: 1.2em;
}

/* ---------- 通用组件 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

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

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

.section-header {
  max-width: 720px;
  margin: 0 auto var(--space-xl);
  text-align: center;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.section-header.light h2,
.section-header.light p {
  color: var(--color-text);
}

.section-light .section-header p {
  color: var(--color-light-muted);
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--accent-cyan);
  background: var(--gradient-subtle);
  border: 1px solid rgba(0, 229, 255, 0.25);
  padding: 0.35em 0.9em;
  border-radius: 999px;
  margin-bottom: var(--space-sm);
}

.section-light .section-tag {
  color: var(--accent-blue);
  border-color: rgba(41, 121, 255, 0.25);
  background: rgba(41, 121, 255, 0.08);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.85em 1.75em;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

.btn-primary {
  color: #000;
  background: var(--gradient-primary);
  border-color: transparent;
  box-shadow: 0 8px 24px rgba(0, 198, 255, 0.25);
}

.btn-primary:hover {
  color: #000;
  box-shadow: 0 12px 32px rgba(0, 198, 255, 0.35);
}

.btn-outline {
  color: #fff;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.btn-large {
  padding: 1em 2.5em;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* ---------- 导航栏 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 15, 28, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: background var(--transition-fast);
}

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

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65em;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
}

.logo:hover {
  color: #fff;
  text-decoration: none;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gradient-primary);
  color: #000;
  font-weight: 800;
  font-size: 0.95rem;
}

.logo-text {
  letter-spacing: -0.01em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.main-nav a {
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5em 0.75em;
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.main-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
  text-decoration: none;
}

.main-nav .nav-cta {
  color: #000;
  background: var(--gradient-primary);
  font-weight: 600;
}

.main-nav .nav-cta:hover {
  background: var(--gradient-primary);
  box-shadow: 0 6px 20px rgba(0, 198, 255, 0.25);
}

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

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding-top: 96px;
  padding-bottom: var(--space-2xl);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0, 198, 255, 0.15), transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 50%, rgba(41, 121, 255, 0.12), transparent 60%),
    var(--color-bg);
}

.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 0%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  background: rgba(0, 229, 255, 0.08);
  padding: 0.5em 1em;
  border-radius: 999px;
  margin-bottom: var(--space-md);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  color: var(--color-text-muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 680px;
  margin: 0 auto var(--space-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.hero-stats .stat {
  text-align: center;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  min-width: 140px;
}

.hero-stats .stat strong {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

.hero-stats .stat span {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ---------- 公司介绍 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-lg);
}

.about-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.about-main h3 {
  font-size: 1.5rem;
  margin-bottom: 0.25em;
}

.about-sub {
  color: var(--color-light-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

.about-main p {
  color: var(--color-text-dark);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

.about-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.about-meta div {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  padding: var(--space-sm);
  background: #f8fafc;
  border-radius: var(--radius-sm);
}

.about-meta span {
  font-size: 0.75rem;
  color: var(--color-light-muted);
}

.about-meta strong {
  font-size: 0.9rem;
  color: var(--color-text-dark);
  font-weight: 600;
}

.about-values h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
}

.value-list {
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-md);
}

.value-list li {
  position: relative;
  padding-left: 1.5em;
  margin-bottom: var(--space-sm);
  color: var(--color-text-dark);
}

.value-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
}

.value-list strong {
  color: var(--accent-blue);
  font-weight: 600;
}

.about-note {
  color: var(--color-light-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

/* ---------- 服务模块 ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition-base), background var(--transition-base), border-color var(--transition-base);
}

.service-card:hover {
  transform: translateY(-6px);
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-strong);
}

.service-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--gradient-subtle);
  border: 1px solid rgba(0, 229, 255, 0.2);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  color: var(--accent-cyan);
}

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

.service-card h3 {
  font-size: 1.15rem;
  margin-bottom: var(--space-sm);
  color: #fff;
}

.service-card > p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.service-card ul {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.8;
  padding-left: 1.1em;
}

.service-card li {
  margin-bottom: 0.35em;
}

/* ---------- 运营案例 ---------- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.case-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.1);
}

.case-image {
  position: relative;
  height: 420px;
  overflow: hidden;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.case-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.case-body {
  padding: var(--space-lg);
}

.case-body h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  color: var(--color-text-dark);
}

.case-body p {
  color: var(--color-light-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.case-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.case-metrics div {
  text-align: center;
  padding: var(--space-sm);
  background: #f8fafc;
  border-radius: var(--radius-sm);
}

.case-metrics strong {
  display: block;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-blue);
  line-height: 1.2;
}

.case-metrics span {
  font-size: 0.75rem;
  color: var(--color-light-muted);
}

/* ---------- 面向市场 ---------- */
.markets-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
}

.market-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.market-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-strong);
}

.market-card.featured {
  background: var(--gradient-subtle);
  border-color: rgba(0, 229, 255, 0.3);
}

.market-card h3 {
  font-size: 1.35rem;
  margin-bottom: var(--space-sm);
  color: #fff;
}

.market-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

/* ---------- CTA ---------- */
.section-cta {
  text-align: center;
  padding: var(--space-3xl) 0;
  background:
    radial-gradient(ellipse 60% 80% at 50% 50%, rgba(0, 198, 255, 0.12), transparent 70%),
    var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta-content h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: var(--space-md);
}

.cta-content p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
}

.cta-content a:not(.btn) {
  color: var(--accent-cyan);
  font-weight: 500;
}

/* ---------- Footer ---------- */
.site-footer {
  background: #050810;
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-container {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6em;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.footer-info {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.9;
}

.footer-info p {
  margin: 0;
}

.footer-copy {
  grid-column: 1 / -1;
  padding-top: var(--space-md);
  margin-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-align: center;
}

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

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

@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: 72px;
    right: -100%;
    width: 70%;
    max-width: 280px;
    height: calc(100dvh - 72px);
    background: rgba(10, 15, 28, 0.96);
    backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
    gap: var(--space-xs);
    border-left: 1px solid var(--color-border);
    transition: right var(--transition-base);
  }

  .main-nav.open {
    right: 0;
  }

  .main-nav a {
    width: 100%;
    padding: 0.75em 1em;
  }

  .menu-toggle {
    display: flex;
  }

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

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

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

  .hero-stats {
    gap: var(--space-sm);
  }

  .services-grid,
  .cases-grid,
  .markets-grid,
  .about-meta {
    grid-template-columns: 1fr;
  }

  .case-image {
    aspect-ratio: 3 / 4;
    max-height: 420px;
  }

  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .footer-brand {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .case-metrics {
    grid-template-columns: 1fr;
  }
}