/* ============================================================
   油兔工作室 YourTwo Studio — 3D 业务官网
   深色科技风 · 全局样式
   ============================================================ */
:root {
  --bg: #070b14;
  --bg2: #0d1322;
  --panel: rgba(17, 25, 46, 0.72);
  --panel-solid: #111a2e;
  --line: rgba(255, 255, 255, 0.08);
  --text: #e6edf7;
  --muted: #8fa3bf;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --violet: #8b5cf6;
  --grad: linear-gradient(120deg, #22d3ee 0%, #3b82f6 50%, #8b5cf6 100%);
  --radius: 14px;
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--cyan); text-decoration: none; transition: opacity .2s; }
a:hover { opacity: .8; }

.container { width: min(1160px, 92%); margin: 0 auto; }

/* ---------------- 顶部导航 ---------------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(7, 11, 20, 0.75);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 18px; color: var(--text);
  letter-spacing: 1px;
}
.logo .mark {
  width: 32px; height: 32px; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--grad);
  border-radius: 8px;
  color: #04121a; font-size: 16px; font-weight: 800;
}
.logo small { font-size: 11px; font-weight: 400; color: var(--muted); letter-spacing: 2px; }

.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--muted); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--cyan); }
.nav-cta {
  padding: 8px 18px !important;
  background: var(--grad);
  color: #04121a !important;
  border-radius: 999px;
  font-weight: 600;
}

/* 移动端菜单按钮 */
.nav-toggle { display: none; background: none; border: 0; color: var(--text); font-size: 22px; cursor: pointer; }

/* ---------------- Hero / 首页 ---------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
}
#bg3d { position: absolute; inset: 0; z-index: 0; }
.hero-content {
  position: relative; z-index: 2;
  width: min(1160px, 92%); margin: 0 auto;
  padding-top: 80px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: rgba(34, 211, 238, 0.08);
  color: var(--cyan);
  border-radius: 999px;
  font-size: 13px; letter-spacing: 2px;
}
.hero h1 {
  margin: 24px 0 16px;
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 2px;
}
.hero h1 .grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero p.sub {
  max-width: 640px;
  color: var(--muted);
  font-size: clamp(15px, 2vw, 18px);
}
.hero-cta { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px;
  border-radius: 999px;
  font-size: 15px; font-weight: 600;
  cursor: pointer; border: 0; transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--grad); color: #04121a; box-shadow: 0 8px 30px rgba(59, 130, 246, 0.35); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--cyan); }

.scroll-hint {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  z-index: 2; color: var(--muted); font-size: 12px; letter-spacing: 3px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.scroll-hint::after {
  content: ""; width: 1px; height: 36px;
  background: linear-gradient(to bottom, var(--cyan), transparent);
  animation: drop 1.6s ease-in-out infinite;
}
@keyframes drop { 0% { transform: scaleY(0); transform-origin: top; } 50% { transform: scaleY(1); } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------------- 区块通用 ---------------- */
.section { padding: 96px 0; }
.section.alt { background: var(--bg2); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .tag {
  color: var(--cyan); font-size: 13px; letter-spacing: 3px;
}
.section-head h2 {
  margin-top: 10px; font-size: clamp(26px, 4vw, 38px); font-weight: 700;
}
.section-head p { margin-top: 12px; color: var(--muted); max-width: 640px; margin-inline: auto; }

/* ---------------- 业务卡片 ---------------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 22px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform .2s, border-color .2s, background .2s;
}
.card:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, 0.4); background: var(--panel-solid); }
.card .icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: grid; place-items: center;
  font-size: 24px;
  background: rgba(34, 211, 238, 0.12);
  margin-bottom: 18px;
}
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 14px; }

/* ---------------- 案例 ---------------- */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.case-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s, border-color .2s;
}
.case-card:hover { transform: translateY(-6px); border-color: rgba(34, 211, 238, 0.4); }
.case-thumb {
  height: 200px;
  display: grid; place-items: center;
  background:
    radial-gradient(circle at 30% 30%, rgba(34,211,238,.15), transparent 60%),
    radial-gradient(circle at 70% 70%, rgba(139,92,246,.15), transparent 60%),
    var(--bg2);
  font-size: 42px;
  border-bottom: 1px solid var(--line);
}
.case-body { padding: 22px; }
.case-body h3 { font-size: 16px; margin-bottom: 8px; }
.case-body p { color: var(--muted); font-size: 13.5px; }
.case-tags { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.case-tags span {
  font-size: 12px; padding: 3px 10px;
  border-radius: 999px;
  background: rgba(34, 211, 238, 0.1);
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.2);
}

/* ---------------- 流程 / 数字 ---------------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 22px; text-align: center; }
.stat .num {
  font-size: 42px; font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
  font-family: var(--mono);
}
.stat .label { color: var(--muted); font-size: 14px; margin-top: 6px; }

/* ---------------- 页面内页通用 ---------------- */
.page-hero {
  position: relative;
  padding: 160px 0 70px;
  background:
    radial-gradient(circle at 20% 20%, rgba(34,211,238,.1), transparent 50%),
    radial-gradient(circle at 80% 40%, rgba(139,92,246,.1), transparent 50%),
    var(--bg);
  border-bottom: 1px solid var(--line);
  text-align: center;
}
.page-hero h1 { font-size: clamp(30px, 5vw, 46px); font-weight: 800; }
.page-hero p { color: var(--muted); margin-top: 12px; max-width: 600px; margin-inline: auto; }

/* ---------------- 关于 ---------------- */
.about-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: start; }
.about-text p { color: var(--muted); margin-bottom: 16px; font-size: 15px; }
.about-text strong { color: var(--text); }
.about-list { list-style: none; }
.about-list li {
  display: flex; gap: 12px; padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}
.about-list li::before { content: "▸"; color: var(--cyan); }

/* ---------------- 联系 ---------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; padding: 20px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 16px; }
.contact-item .icon { font-size: 22px; }
.contact-item .label { color: var(--muted); font-size: 13px; }
.contact-item .value { font-size: 16px; font-weight: 600; margin-top: 2px; }
.contact-note { color: var(--muted); font-size: 13.5px; margin-top: 18px; }

/* ---------------- 页脚 ---------------- */
.footer { border-top: 1px solid var(--line); padding: 40px 0; background: #05080f; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer p { color: var(--muted); font-size: 13px; }
.footer .links { display: flex; gap: 20px; font-size: 13px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(7, 11, 20, 0.97);
    border-bottom: 1px solid var(--line);
    padding: 12px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 24px; width: 100%; }
  .nav-toggle { display: block; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .section { padding: 70px 0; }
}

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }