/* ========================================
   上海星河云创 — 企业官网样式
   ======================================== */

:root {
  --bg-deep: #060810;
  --bg-elevated: #0c1220;
  --surface: rgba(18, 28, 48, 0.55);
  --surface-border: rgba(120, 160, 220, 0.12);
  --text: #e8edf5;
  --text-muted: #8b9cb8;
  --accent: #5ba3ff;
  --accent-soft: rgba(91, 163, 255, 0.15);
  --accent-glow: rgba(91, 163, 255, 0.35);
  --violet: #9d7af0;
  --radius-lg: 20px;
  --radius-md: 12px;
  --header-h: 72px;
  --font-cn: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en: "Outfit", var(--font-cn);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-deep);
  min-height: 100vh;
  overflow-x: hidden;
}

/* 背景星点与光晕 */
.stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1px 1px at 75% 55%, rgba(255, 255, 255, 0.25), transparent),
    radial-gradient(1px 1px at 45% 80%, rgba(255, 255, 255, 0.2), transparent),
    radial-gradient(1.5px 1.5px at 88% 22%, rgba(91, 163, 255, 0.4), transparent),
    radial-gradient(1px 1px at 12% 70%, rgba(157, 122, 240, 0.35), transparent),
    linear-gradient(165deg, #060810 0%, #0a1020 45%, #0d1528 100%);
  background-size: 100% 100%;
  pointer-events: none;
}

.glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}

.glow-1 {
  width: 520px;
  height: 520px;
  top: -120px;
  right: -80px;
  background: radial-gradient(circle, rgba(91, 163, 255, 0.25) 0%, transparent 70%);
}

.glow-2 {
  width: 420px;
  height: 420px;
  bottom: 10%;
  left: -100px;
  background: radial-gradient(circle, rgba(157, 122, 240, 0.2) 0%, transparent 70%);
}

/* 页头 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(6, 8, 16, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--surface-border);
}

.header-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.logo-mark {
  font-size: 1.2rem;
  color: var(--accent);
  text-shadow: 0 0 24px var(--accent-glow);
}

.logo-text {
  font-family: var(--font-cn);
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  padding: 10px 16px;
  border-radius: 999px;
  transition: color 0.25s var(--ease-out), background 0.25s var(--ease-out);
}

.nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav a.is-active {
  color: var(--text) !important;
  background: rgba(91, 163, 255, 0.14) !important;
  border: 1px solid rgba(91, 163, 255, 0.35);
  box-shadow: 0 10px 30px rgba(91, 163, 255, 0.12);
}

.nav-cta {
  background: var(--accent-soft) !important;
  color: var(--accent) !important;
  border: 1px solid rgba(91, 163, 255, 0.35);
}

.nav-cta:hover {
  background: rgba(91, 163, 255, 0.22) !important;
  color: #b8d8ff !important;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s;
}

/* 主内容区层级 */
main {
  position: relative;
  z-index: 1;
  padding-top: var(--header-h);
}

/* Hero */
.hero {
  max-width: 1160px;
  margin: 0 auto;
  padding: clamp(56px, 12vh, 120px) 24px clamp(80px, 14vh, 140px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  min-height: calc(100vh - var(--header-h));
}

.hero-eyebrow {
  font-family: var(--font-en);
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 20px;
}

.hero-title {
  margin: 0 0 24px;
  font-weight: 700;
  line-height: 1.15;
}

.hero-title-line {
  display: block;
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  background: linear-gradient(120deg, #fff 0%, #b8d4ff 50%, #c4b5fd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title-sub {
  display: block;
  font-size: clamp(1.25rem, 2.8vw, 1.75rem);
  font-weight: 500;
  color: var(--text-muted);
  margin-top: 8px;
}

.hero-desc {
  margin: 0 0 36px;
  max-width: 520px;
  color: var(--text-muted);
  font-size: 1.0625rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s, background 0.2s;
}

.btn-primary {
  background: linear-gradient(135deg, #5ba3ff 0%, #7c6cf0 100%);
  color: #fff;
  border: none;
  box-shadow: 0 8px 32px rgba(91, 163, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(91, 163, 255, 0.45);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--surface-border);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(120, 160, 220, 0.25);
}

/* Hero 视觉 */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.orbit {
  position: relative;
  width: min(380px, 80vw);
  height: min(380px, 80vw);
}

.orbit-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(91, 163, 255, 0.25);
  box-shadow:
    inset 0 0 60px rgba(91, 163, 255, 0.08),
    0 0 80px rgba(91, 163, 255, 0.12);
  animation: spin 28s linear infinite;
}

.orbit-ring::before {
  content: "";
  position: absolute;
  top: 8%;
  left: 50%;
  width: 10px;
  height: 10px;
  margin-left: -5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 20px var(--accent);
}

.orbit-core {
  position: absolute;
  inset: 22%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.2), transparent 50%),
    linear-gradient(145deg, rgba(30, 45, 80, 0.9) 0%, rgba(12, 18, 36, 0.95) 100%);
  border: 1px solid rgba(120, 160, 220, 0.2);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 通用区块 */
.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: 88px 24px;
}

.section-header {
  margin-bottom: 48px;
  max-width: 640px;
}

.section-header h2 {
  margin: 0 0 16px;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.section-lead {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.0625rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
}

.about-card h3 {
  margin: 0 0 14px;
  font-size: 1.125rem;
  font-weight: 600;
}

.about-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.975rem;
}

.about-stats {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.stat-value {
  display: block;
  font-family: var(--font-en);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Services */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.service-card:hover {
  border-color: rgba(91, 163, 255, 0.35);
  transform: translateY(-4px);
}

.service-icon {
  font-size: 1.5rem;
  color: var(--violet);
  margin-bottom: 16px;
}

.service-card h3 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.service-card p {
  margin: 0 0 20px;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.service-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-tags li {
  font-size: 0.75rem;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid var(--surface-border);
}

/* Products */
.products {
  padding-bottom: 100px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  position: relative;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(20, 32, 56, 0.7) 0%, rgba(10, 14, 28, 0.85) 100%);
  border: 1px solid var(--surface-border);
  overflow: hidden;
}

.product-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.6;
}

.product-meta {
  font-family: var(--font-en);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.product-card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.product-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.925rem;
}

/* Contact */
.contact {
  padding-top: 40px;
  padding-bottom: 100px;
}

.contact-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: clamp(32px, 5vw, 48px);
  backdrop-filter: blur(16px);
}

.contact-copy h2 {
  margin: 0 0 16px;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}

.contact-copy p {
  margin: 0;
  color: var(--text-muted);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-family: var(--font-en);
}

.contact-value {
  font-size: 1rem;
  color: var(--text);
}

.contact-value.link {
  color: var(--accent);
  text-decoration: none;
}

.contact-value.link:hover {
  text-decoration: underline;
}

.contact-note {
  margin: 20px 0 0;
  font-size: 0.8125rem;
  color: rgba(139, 156, 184, 0.65);
  text-align: center;
}

/* Footer */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--surface-border);
  padding: 28px 24px 40px;
  background: rgba(6, 8, 16, 0.85);
}

.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.footer-brand {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-icp {
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.25s var(--ease-out);
}

.footer-icp:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer-tagline {
  font-size: 0.8125rem;
  color: rgba(91, 163, 255, 0.7);
  letter-spacing: 0.08em;
}

/* 滚动显现 */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.08s;
}

.reveal-delay-2 {
  transition-delay: 0.16s;
}

.reveal-delay-3 {
  transition-delay: 0.24s;
}

/* 移动端 */
@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    min-height: auto;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
    margin-bottom: 16px;
  }

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

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

  .service-grid,
  .product-grid {
    grid-template-columns: 1fr;
  }

  .contact-panel {
    grid-template-columns: 1fr;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px;
    background: rgba(6, 8, 16, 0.96);
    border-bottom: 1px solid var(--surface-border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease-out), opacity 0.35s;
  }

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

  .nav a {
    border-radius: var(--radius-md);
    text-align: center;
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .orbit-ring {
    animation: none;
    transition: none;
  }

  .orbit-ring {
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}