/*
 * CYU-86 经营沙盘新首页样式（源：运营分析师 HTML 原型 v1，外链化以满足 CSP style-src 'self'）。
 * 结构、文案、配色、间距与原型保持一致；禁止在本文件之外使用内联样式。
 */
:root {
  --ink: #16233b;
  --ink-soft: #5a6b85;
  --primary: #2456e0;
  --primary-deep: #1a3fa8;
  --primary-soft: #e8eefc;
  --gold: #d99a2b;
  --bg: #f6f8fc;
  --card: #ffffff;
  --line: #e3e9f2;
  --radius: 14px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ── 顶部导航 ─────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  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-size: 18px; font-weight: 700; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-deep));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800;
}
.nav-links { display: flex; gap: 12px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; border-radius: 10px; cursor: pointer;
  font-size: 15px; font-weight: 600; padding: 10px 22px;
  border: 1px solid transparent; transition: all .15s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-deep); }
.btn-ghost { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-ghost:hover { background: var(--primary-soft); }
.btn-sm { padding: 7px 16px; font-size: 14px; }

/* ── Hero ─────────────────────────────── */
.hero {
  text-align: center;
  padding: 88px 0 72px;
  background:
    radial-gradient(700px 300px at 20% 0%, rgba(36,86,224,.10), transparent),
    radial-gradient(700px 300px at 80% 10%, rgba(217,154,43,.10), transparent);
}
.hero h1 {
  font-size: 40px; line-height: 1.3; font-weight: 800; letter-spacing: 1px;
}
.hero h1 em { font-style: normal; color: var(--primary); }
.hero .sub {
  margin: 18px auto 10px; font-size: 19px; color: var(--ink-soft); max-width: 560px;
}
.hero .tags {
  margin: 0 auto 36px; display: flex; gap: 14px; justify-content: center;
  flex-wrap: wrap; font-size: 14px; color: var(--ink-soft);
}
.hero .tags span::before { content: "·"; margin-right: 14px; color: var(--gold); }
.hero .tags span:first-child::before { content: ""; margin: 0; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-cta .btn { font-size: 17px; padding: 14px 34px; }

/* ── 价值卡片 ──────────────────────────── */
.values { padding: 56px 0 24px; }
.sec-title { text-align: center; font-size: 26px; font-weight: 700; margin-bottom: 8px; }
.sec-desc { text-align: center; color: var(--ink-soft); margin-bottom: 36px; }
.value-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.value-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px; transition: box-shadow .15s ease, transform .15s ease;
}
.value-card:hover { box-shadow: 0 8px 24px rgba(22,35,59,.08); transform: translateY(-2px); }
.value-icon {
  width: 44px; height: 44px; border-radius: 10px; background: var(--primary-soft);
  color: var(--primary); display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 14px;
}
.value-card h3 { font-size: 17px; margin-bottom: 6px; }
.value-card p { font-size: 14px; color: var(--ink-soft); }

/* ── 使用流程 ──────────────────────────── */
.steps { padding: 56px 0; }
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step {
  text-align: center; padding: 28px 20px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
}
.step-no {
  width: 36px; height: 36px; margin: 0 auto 12px; border-radius: 50%;
  background: var(--primary); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--ink-soft); }

/* ── 底部入口大卡片 ─────────────────────── */
.entries { padding: 24px 0 64px; }
.entry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.entry-card {
  border-radius: 18px; padding: 40px 36px; color: #fff; position: relative; overflow: hidden;
}
.entry-card.trainee { background: linear-gradient(135deg, #2456e0, #1a3fa8); }
.entry-card.instructor { background: linear-gradient(135deg, #2c3a55, #16233b); }
.entry-card h3 { font-size: 24px; margin-bottom: 8px; }
.entry-card p { font-size: 15px; opacity: .85; margin-bottom: 24px; }
.entry-card .btn {
  background: #fff; color: var(--ink); font-size: 16px; padding: 12px 30px;
}
.entry-card.trainee .btn:hover { color: var(--primary); }
.entry-card.instructor .btn:hover { color: var(--primary-deep); }
.entry-badge {
  position: absolute; top: 20px; right: 24px; font-size: 12px;
  background: rgba(255,255,255,.18); padding: 4px 12px; border-radius: 999px;
}

/* ── 页脚 ─────────────────────────────── */
footer {
  border-top: 1px solid var(--line); padding: 28px 0;
  text-align: center; font-size: 13px; color: var(--ink-soft);
}

/* ── 响应式 ───────────────────────────── */
@media (max-width: 860px) {
  .value-grid { grid-template-columns: repeat(2, 1fr); }
  .step-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .hero { padding: 60px 0 48px; }
}
@media (max-width: 480px) {
  .value-grid { grid-template-columns: 1fr; }
  .entry-grid { grid-template-columns: 1fr; }
  .nav-links .btn-ghost { display: none; } /* 小屏收起顶栏次入口，保留底部双卡片 */
  .hero-cta { flex-direction: column; align-items: center; }
}