/* 中铭信息 · 科技风企业官网 */
:root {
  --primary: #0ea5e9;
  --primary-dark: #0284c7;
  --accent: #22d3ee;
  --violet: #6366f1;
  --bg: #060b14;
  --bg-elevated: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.72);
  --ink: #f1f5f9;
  --muted: #94a3b8;
  --border: rgba(56, 189, 248, 0.18);
  --glow: 0 0 40px rgba(14, 165, 233, 0.25);
  --radius: 14px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --max: 1140px;
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; display: block; }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: fixed; inset: 0 0 auto; z-index: 50; height: var(--header-h);
  background: rgba(6, 11, 20, 0.75); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: border-color 0.2s, background 0.2s;
}
.site-header.scrolled { border-color: var(--border); background: rgba(6, 11, 20, 0.92); }
.header-inner {
  height: var(--header-h); display: flex; align-items: center; gap: 1rem;
}
.logo { display: flex; align-items: center; gap: 0.65rem; color: var(--ink); }
.logo-img { border-radius: 10px; }
.logo-text { font-weight: 700; font-size: 1.05rem; line-height: 1.2; }
.logo-text small { display: block; font-size: 0.7rem; font-weight: 500; color: var(--muted); }
.nav-desktop { display: none; gap: 1.25rem; margin-left: auto; }
.nav-desktop a { color: var(--muted); font-size: 0.9rem; }
.nav-desktop a:hover { color: var(--ink); }
.nav-toggle {
  margin-left: auto; background: none; border: 1px solid var(--border);
  color: var(--ink); padding: 0.4rem 0.75rem; border-radius: 8px; cursor: pointer;
  font-size: 0.8rem; font-weight: 600; letter-spacing: 0.05em;
}
@media (min-width: 900px) {
  .nav-desktop { display: flex; }
  .nav-toggle { display: none; }
}
.nav-mobile {
  display: none; flex-direction: column; gap: 0.5rem;
  padding: 1rem; background: var(--bg-elevated); border-bottom: 1px solid var(--border);
}
.nav-mobile.open { display: flex; }
.nav-mobile a { color: var(--muted); padding: 0.5rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.65rem 1.25rem; border-radius: 10px; font-weight: 600; font-size: 0.9rem;
  border: 1px solid transparent; cursor: pointer; transition: transform 0.15s, box-shadow 0.2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--violet));
  color: #fff; box-shadow: var(--glow);
}
.btn-primary:hover { transform: translateY(-1px); color: #fff; }
.btn-outline {
  border-color: var(--border); color: var(--ink); background: rgba(14, 165, 233, 0.08);
}
.btn-outline:hover { border-color: var(--primary); color: var(--accent); }

.hero {
  position: relative; padding: calc(var(--header-h) + 3rem) 0 4rem; overflow: hidden;
}
.hero-code-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; opacity: 0.55;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 1;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(99, 102, 241, 0.35), transparent),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(14, 165, 233, 0.2), transparent),
    linear-gradient(180deg, rgba(6, 11, 20, 0.3) 0%, rgba(6, 11, 20, 0.85) 100%);
}
.hero-grid {
  position: relative; z-index: 2; display: grid; gap: 2.5rem; align-items: center;
}
@media (min-width: 900px) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; } }
.hero-eyebrow {
  display: inline-block; font-size: 0.8rem; letter-spacing: 0.08em;
  color: var(--accent); border: 1px solid var(--border); padding: 0.35rem 0.75rem;
  border-radius: 999px; margin-bottom: 1rem;
}
.hero h1 { font-size: clamp(1.75rem, 4vw, 2.65rem); line-height: 1.2; font-weight: 700; }
.hero h1 em {
  font-style: normal;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead { margin: 1.25rem 0; color: var(--muted); font-size: 1.05rem; max-width: 36em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.5rem; }
.hero-trust {
  display: flex; flex-wrap: wrap; gap: 1rem; font-size: 0.85rem; color: var(--muted);
}
.hero-trust strong { color: var(--ink); display: block; font-size: 0.75rem; letter-spacing: 0.05em; }

.hero-terminal {
  background: rgba(6, 11, 20, 0.82); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--glow); overflow: hidden; backdrop-filter: blur(8px);
}
.terminal-bar {
  display: flex; align-items: center; gap: 0.35rem; padding: 0.55rem 0.85rem;
  background: rgba(15, 23, 42, 0.9); border-bottom: 1px solid var(--border);
  font-size: 0.72rem; color: var(--muted);
}
.terminal-dot { width: 8px; height: 8px; border-radius: 50%; }
.terminal-dot:nth-child(1) { background: #f87171; }
.terminal-dot:nth-child(2) { background: #fbbf24; }
.terminal-dot:nth-child(3) { background: #4ade80; }
.terminal-body-wrap {
  padding: 1rem 1.1rem 1.1rem; font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.78rem; line-height: 1.55; min-height: 11.5rem;
}
#hero-terminal-body {
  margin: 0; white-space: pre-wrap; color: var(--muted); word-break: break-word;
}
.terminal-cursor {
  display: inline-block; width: 8px; height: 1em; background: var(--accent);
  vertical-align: text-bottom; margin-left: 2px; animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.code-panel {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; font-family: ui-monospace, monospace; font-size: 0.8rem;
  box-shadow: var(--glow);
}
.code-panel .line { color: var(--muted); margin-bottom: 0.5rem; }
.code-panel .hi { color: var(--accent); }
.code-panel .ok { color: #4ade80; }

.card-ai {
  border-color: rgba(34, 211, 238, 0.45);
  background: linear-gradient(145deg, rgba(14, 165, 233, 0.12), rgba(99, 102, 241, 0.08));
  position: relative;
}
.card-ai .ai-badge {
  position: absolute; top: 0.85rem; right: 0.85rem;
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem; border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), var(--violet)); color: #fff;
}
.ai-cap-grid {
  display: grid; gap: 0.65rem; margin-top: 1rem;
}
@media (min-width: 600px) { .ai-cap-grid { grid-template-columns: 1fr 1fr; } }
.ai-cap-grid li {
  list-style: none; font-size: 0.88rem; color: var(--muted);
  padding-left: 1.1rem; position: relative;
}
.ai-cap-grid li::before {
  content: ''; position: absolute; left: 0; top: 0.55em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.ai-highlight {
  margin-top: 1.75rem; padding: 1.5rem 1.75rem;
  border: 1px solid rgba(34, 211, 238, 0.3); border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.1), rgba(99, 102, 241, 0.06));
}
.ai-highlight h3 { font-size: 1.05rem; margin-bottom: 0.5rem; color: var(--accent); }
.ai-highlight p { color: var(--muted); font-size: 0.92rem; line-height: 1.75; }

section { padding: 4rem 0; }
.section-head { text-align: center; max-width: 40em; margin: 0 auto 2.5rem; }
.section-head h2 { font-size: clamp(1.4rem, 3vw, 1.85rem); margin-bottom: 0.75rem; }
.section-head p { color: var(--muted); }
.section-head.light h2 { color: var(--ink); }

.grid-3 { display: grid; gap: 1.25rem; }
@media (min-width: 768px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 767px) {
  .card-ai { order: -1; }
}
.grid-2 { display: grid; gap: 1.25rem; }
@media (min-width: 768px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } }

.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: rgba(14, 165, 233, 0.45); transform: translateY(-2px); }
.card-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.25rem; height: 2.25rem; margin-bottom: 0.85rem;
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.04em;
  color: var(--accent); border: 1px solid var(--border); border-radius: 8px;
  background: rgba(14, 165, 233, 0.1);
}
.card-ai .card-num { color: #fff; background: linear-gradient(135deg, var(--primary), var(--violet)); border-color: transparent; }
.card h3 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.card p { color: var(--muted); font-size: 0.92rem; }

.process-row {
  display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-top: 1.5rem;
}
.process-row span {
  padding: 0.5rem 1rem; background: rgba(14, 165, 233, 0.12);
  border: 1px solid var(--border); border-radius: 8px; font-size: 0.85rem;
}
.process-row .arrow { background: none; border: none; color: var(--primary); }

.timeline { max-width: 720px; margin: 0 auto; }
.timeline-item {
  display: grid; grid-template-columns: 80px 1fr; gap: 1rem; padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.timeline-item:last-child { border-bottom: none; }
.timeline-item .year { font-weight: 700; color: var(--primary); font-size: 1.1rem; }
.timeline-item p { color: var(--muted); font-size: 0.92rem; }

.case-tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-bottom: 1.5rem; }
.case-tabs button {
  padding: 0.45rem 1rem; border-radius: 999px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); cursor: pointer; font-size: 0.85rem;
}
.case-tabs button.active {
  background: linear-gradient(135deg, var(--primary), var(--violet)); color: #fff; border-color: transparent;
}
.case-card { display: none; }
.case-card.visible { display: block; }
.case-card .tag {
  display: inline-block; font-size: 0.72rem; padding: 0.2rem 0.55rem;
  border-radius: 6px; background: rgba(99, 102, 241, 0.2); color: var(--accent); margin-bottom: 0.5rem;
}
.case-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.case-card p { color: var(--muted); font-size: 0.9rem; line-height: 1.65; }

.trust-bar {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center;
  padding: 1.5rem; background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border);
}
.trust-bar div { text-align: center; min-width: 140px; }
.trust-bar strong { display: block; color: var(--accent); font-size: 0.95rem; }
.trust-bar span { font-size: 0.8rem; color: var(--muted); }

.section-alt { background: var(--bg-elevated); }

.faq-list { max-width: 720px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item button {
  width: 100%; text-align: left; padding: 1rem 0; background: none; border: none;
  color: var(--ink); font-size: 1rem; font-weight: 600; cursor: pointer;
}
.faq-answer { display: none; padding-bottom: 1rem; color: var(--muted); font-size: 0.92rem; }
.faq-item.open .faq-answer { display: block; }

.contact-grid {
  display: grid; gap: 2rem;
}
@media (min-width: 800px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-form label { display: block; margin-bottom: 0.75rem; font-size: 0.85rem; color: var(--muted); }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; margin-top: 0.35rem; padding: 0.65rem 0.75rem;
  border-radius: 8px; border: 1px solid var(--border); background: var(--bg);
  color: var(--ink); font-family: inherit;
}
.channel { display: flex; gap: 0.75rem; margin-bottom: 1rem; font-size: 0.95rem; }
.channel strong { display: block; color: var(--ink); font-size: 0.85rem; }

.site-footer {
  padding: 2.5rem 0; border-top: 1px solid var(--border);
  font-size: 0.85rem; color: var(--muted);
}
.footer-grid { display: grid; gap: 1.5rem; }
@media (min-width: 700px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }
.footer-links a { display: block; color: var(--muted); margin-bottom: 0.35rem; }
.footer-links a:hover { color: var(--accent); }

.insights-grid { display: grid; gap: 1rem; }
@media (min-width: 600px) { .insights-grid { grid-template-columns: repeat(2, 1fr); } }
.insight-link {
  display: block; padding: 1.25rem; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.insight-link h4 { font-size: 1rem; margin: 0.5rem 0; color: var(--ink); }
.insight-link p { font-size: 0.85rem; color: var(--muted); }
.tag-pill { font-size: 0.72rem; color: var(--accent); }

.app-loading { color: var(--muted); text-align: center; }
.hidden { display: none !important; }