/* 青岛源海融信息科技有限公司 — 站点样式 */

:root {
  --color-bg: #0a1628;
  --color-bg-soft: #0f2140;
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #e8eef6;
  --color-text-muted: #94a3b8;
  --color-accent: #22d3ee;
  --color-accent-dim: rgba(34, 211, 238, 0.15);
  --color-accent-deep: #0891b2;
  --font-sans: "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --header-h: 72px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: #67e8f9;
}

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

.container {
  width: min(1120px, 100% - 40px);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  width: min(1120px, 100% - 40px);
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.05rem;
}

.logo:hover {
  color: var(--color-text);
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-accent-deep), var(--color-accent));
  color: var(--color-bg);
  font-weight: 700;
  font-size: 1.1rem;
}

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

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

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

.site-nav a {
  color: var(--color-text-muted);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.site-nav .nav-cta {
  margin-left: 8px;
  color: var(--color-bg);
  background: linear-gradient(135deg, var(--color-accent), #5eead4);
}

.site-nav .nav-cta:hover {
  color: var(--color-bg);
  filter: brightness(1.08);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  padding: calc(var(--header-h) + 48px) 24px 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(34, 211, 238, 0.25), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(8, 145, 178, 0.2), transparent),
    radial-gradient(ellipse 50% 30% at 0% 80%, rgba(94, 234, 212, 0.12), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  width: min(720px, 100%);
  margin-inline: auto;
  text-align: center;
}

.hero-eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 16px;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.hero-sub {
  display: block;
  margin-top: 8px;
  font-size: 0.55em;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
}

.hero-lead {
  margin: 0 auto 32px;
  max-width: 520px;
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: var(--color-bg);
  background: linear-gradient(135deg, var(--color-accent), #5eead4);
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.35);
}

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

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

.btn-ghost:hover {
  color: var(--color-text);
  border-color: rgba(34, 211, 238, 0.4);
}

.hero-stats {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  margin-top: 72px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}

.stat {
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 1.25rem;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.stat span {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Sections */
.section {
  padding: 88px 0;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

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

.section-desc {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.section-head-light h2,
.section-head-light .section-desc {
  color: var(--color-text);
}

.section-head-light .section-desc {
  opacity: 0.85;
}

/* About */
.section-about {
  background: var(--color-bg-soft);
}

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

.about-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.about-card h3 {
  margin: 0 0 12px;
  font-size: 1.15rem;
}

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

.about-card.highlight {
  border-color: rgba(34, 211, 238, 0.35);
  background: var(--color-accent-dim);
}

.about-card.highlight p {
  color: var(--color-text);
}

/* Services */
.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.service-item {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: linear-gradient(160deg, var(--color-surface), transparent);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.service-item:hover {
  border-color: rgba(34, 211, 238, 0.35);
  transform: translateY(-4px);
}

.service-icon {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.service-item h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.service-item p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Values */
.section-values {
  background: linear-gradient(180deg, var(--color-bg-soft) 0%, var(--color-bg) 100%);
  position: relative;
}

.section-values::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 40% at 50% 0%, rgba(34, 211, 238, 0.12), transparent);
  pointer-events: none;
}

.section-values .container {
  position: relative;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.value-card {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.value-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.value-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Quote */
.section-cases {
  padding-bottom: 100px;
}

.principle-quote {
  margin: 0 auto;
  max-width: 720px;
  padding: 40px 48px;
  border-radius: var(--radius-lg);
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
}

.principle-quote p {
  margin: 0 0 20px;
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.75;
}

.principle-quote footer {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Contact */
.section-contact {
  background: var(--color-bg-soft);
  padding-bottom: 100px;
}

.contact-layout .section-head {
  margin-bottom: 32px;
}

.contact-card {
  max-width: 560px;
  margin-inline: auto;
  padding: 36px;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.contact-list {
  margin: 0;
}

.contact-list > div {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-list > div:last-of-type {
  border-bottom: 0;
}

.contact-list dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.contact-list dd {
  margin: 0;
  font-size: 1rem;
}

.contact-note {
  margin: 24px 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Footer */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}

.footer-brand .logo-mark {
  width: 36px;
  height: 36px;
  font-size: 0.95rem;
}

.footer-copy {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Mobile */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

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

  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 24px;
    background: rgba(10, 22, 40, 0.98);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s var(--ease), opacity 0.3s var(--ease), visibility 0.3s;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav a {
    text-align: center;
  }

  .site-nav .nav-cta {
    margin-left: 0;
    margin-top: 8px;
  }

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

  .principle-quote {
    padding: 28px 24px;
  }

  .contact-card {
    padding: 24px;
  }
}