/* 米宗科技 - 变量与基础 */
:root {
  --bg-dark: #0d1117;
  --bg-card: #161b22;
  --bg-elevated: #21262d;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-dim: #388bfd;
  --accent-glow: rgba(56, 139, 253, 0.25);
  --border: #30363d;
  --radius: 12px;
  --radius-sm: 8px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --header-h: 64px;
  --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-dark);
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dim); }
img { max-width: 100%; height: auto; display: block; }

/* 顶栏 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon { height: 28px; width: auto; flex-shrink: 0; }
.logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}
.logo:hover .logo-text { color: var(--text-primary); }

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.nav-toggle:hover { background: var(--bg-elevated); }
.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav { display: none; }
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-xl);
}
.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition);
}
.nav-link:hover,
.nav-link.active { color: var(--accent); }

/* 移动端导航展开 */
.nav.is-open { display: block; }
.nav.is-open .nav-list {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-xl);
  background: var(--bg-dark);
  padding: var(--space-2xl);
}

@media (min-width: 768px) {
  .nav-toggle { display: none; }
  .nav { display: block; }
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--header-h) var(--space-lg) var(--space-3xl);
  text-align: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, var(--accent-glow) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(56, 139, 253, 0.08) 0%, transparent 50%),
    var(--bg-dark);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
}
.hero-logo-wrap {
  margin-bottom: var(--space-md);
  animation: heroFadeIn 0.8s ease-out;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}
.hero-logo-icon {
  width: 80px;
  height: auto;
}
.hero-logo-text {
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}
.hero-slogan {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-primary);
  animation: heroFadeIn 0.8s ease-out 0.15s both;
}
.hero-en {
  margin: 0 0 var(--space-xl);
  font-size: 0.9rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  animation: heroFadeIn 0.8s ease-out 0.2s both;
}
.hero-cta {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius);
  transition: transform var(--transition), box-shadow var(--transition);
  animation: heroFadeIn 0.8s ease-out 0.3s both;
}
.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
  color: #fff;
}
.hero-scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  animation: heroFadeIn 0.8s ease-out 0.5s both;
}
.hero-scroll-line {
  display: block;
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  border-radius: 1px;
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(0.8); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}

/* 通用区块 */
.section {
  padding: var(--space-3xl) var(--space-lg);
}
.container {
  max-width: var(--max-width);
  margin: 0 auto;
}
.section-title {
  margin: 0 0 var(--space-md);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.02em;
}
.section-lead {
  max-width: 560px;
  margin: 0 auto var(--space-2xl);
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

/* 业务卡片 */
.services { background: var(--bg-card); }
.cards {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-xl);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-dim);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}
.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
  color: var(--accent);
}
.card-icon svg { width: 100%; height: 100%; }
.card-title {
  margin: 0 0 var(--space-sm);
  font-size: 1.25rem;
  font-weight: 600;
}
.card-desc {
  margin: 0 0 var(--space-md);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}
.card-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.card-tags li {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.8rem;
  color: var(--accent);
  background: rgba(56, 139, 253, 0.12);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 139, 253, 0.25);
}

/* 业务区图形：同心圆 */
.services-visual {
  position: relative;
  width: 180px;
  height: 180px;
  margin: var(--space-2xl) auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.visual-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--border);
  opacity: 0.6;
  animation: visualPulse 4s ease-in-out infinite;
}
.visual-ring-1 { width: 100%; height: 100%; animation-delay: 0s; }
.visual-ring-2 { width: 75%; height: 75%; animation-delay: 0.5s; }
.visual-ring-3 { width: 50%; height: 50%; animation-delay: 1s; }
.visual-center {
  position: relative;
  z-index: 1;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 24px var(--accent-glow);
}
.visual-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
}
@keyframes visualPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.02); opacity: 0.8; }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 768px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
}

/* 关于 */
.about {
  position: relative;
  background: var(--bg-dark);
  overflow: hidden;
}
.about-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 30% 80%, rgba(56, 139, 253, 0.06) 0%, transparent 50%);
  pointer-events: none;
}
.about-grid {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
}
@media (min-width: 768px) {
  .about-grid { grid-template-columns: 1fr auto; gap: var(--space-3xl); }
}
.about-content { text-align: center; }
@media (min-width: 768px) { .about-content { text-align: left; } }
.about-text {
  margin: 0 0 var(--space-md);
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
}
.about-text strong { color: var(--accent); }
.about-meta {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-sm) var(--space-lg);
  margin: var(--space-lg) 0 0;
  font-size: 0.95rem;
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
}
@media (min-width: 768px) { .about-meta { margin-left: 0; margin-right: 0; } }
.about-meta dt { color: var(--text-secondary); font-weight: 500; }
.about-meta dd { margin: 0; color: var(--text-primary); }
.about-figure {
  display: flex;
  justify-content: center;
  align-items: center;
}
.about-figure-inner {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 2px solid var(--accent-dim);
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 32px var(--accent-glow);
}
.about-year {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
}
.about-year-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* 联系 */
.contact { background: var(--bg-card); }
.contact-content { text-align: center; }
.contact-text { margin: 0 0 var(--space-md); color: var(--text-secondary); }
.contact-link {
  display: inline-block;
  font-size: 1.125rem;
  font-weight: 600;
  padding: var(--space-sm) 0;
  border-bottom: 2px solid var(--accent);
  transition: color var(--transition);
}

/* 页脚 */
.site-footer {
  padding: var(--space-xl) var(--space-lg);
  border-top: 1px solid var(--border);
  background: var(--bg-dark);
}
.footer-inner { text-align: center; }
.footer-copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}