/* ============================================================
   站4 www.gcgig.cn · 铁蛋电竞 公共设计系统（emerald 绿色主题）
   仅公共框架与通用组件；各页面专属样式见 css/<page>.css
   ============================================================ */

/* ===== 设计变量 ===== */
:root {
  /* emerald 色阶 */
  --em-50:#ecfdf5; --em-100:#d1fae5; --em-200:#a7f3d0; --em-300:#6ee7b7;
  --em-400:#34d399; --em-500:#10b981; --em-600:#059669; --em-700:#047857;
  --em-800:#065f46; --em-900:#064e3b;
  /* 中性 */
  --ink-900:#16201c; --ink-700:#44403c; --ink-500:#78716c; --ink-400:#a8a29e;
  --ink-300:#d6d3d1; --ink-200:#e7e5e4; --ink-100:#f5f5f4; --ink-50:#fafaf9;
  /* 语义别名 */
  --primary:var(--em-500); --primary-dark:var(--em-600); --primary-soft:var(--em-50);
  --accent:#f59e0b;
  /* 圆角 / 阴影 / 间距 */
  --radius-sm:8px; --radius:14px; --radius-lg:20px; --radius-pill:999px;
  --shadow-xs:0 1px 2px rgba(22,32,28,.06);
  --shadow-sm:0 2px 12px rgba(22,32,28,.08);
  --shadow:0 12px 34px rgba(22,32,28,.10);
  --shadow-lg:0 26px 64px rgba(22,32,28,.16);
  --wrap:1200px;
}

/* ===== Reset ===== */
* { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; }
body {
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink-900); background:var(--ink-50); line-height:1.65;
}
h1,h2,h3,h4,h5,h6 { margin:0; line-height:1.3; font-weight:700; color:var(--ink-900); }
p { margin:0; }
a { color:var(--em-700); text-decoration:none; transition:color .18s ease; }
a:hover { color:var(--em-600); }
img { max-width:100%; display:block; }
ul,ol { list-style:none; }
button { font-family:inherit; cursor:pointer; }

.container { max-width:var(--wrap); margin:0 auto; padding:0 22px; }
.section { padding:64px 0; }
.section-head { text-align:center; max-width:680px; margin:0 auto 42px; }
.section-head h2 { font-size:28px; }
.section-head .sub { color:var(--ink-500); font-size:15px; margin-top:10px; }
.eyebrow {
  display:inline-block; font-size:12.5px; font-weight:700; letter-spacing:1px;
  color:var(--em-700); background:var(--em-50); border:1px solid var(--em-200);
  padding:5px 14px; border-radius:var(--radius-pill); margin-bottom:14px;
}

/* ===== 按钮 ===== */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:6px;
  padding:12px 26px; border-radius:var(--radius-pill); font-size:14.5px; font-weight:700;
  border:1px solid transparent; transition:all .18s ease; white-space:nowrap;
}
.btn-primary { background:var(--em-600); color:#fff; box-shadow:0 8px 20px rgba(5,150,105,.28); }
.btn-primary:hover { background:var(--em-700); color:#fff; transform:translateY(-2px); }
.btn-ghost { background:#fff; color:var(--em-700); border-color:var(--em-200); }
.btn-ghost:hover { border-color:var(--em-400); color:var(--em-600); }
.btn-outline { background:transparent; color:var(--em-700); border-color:var(--em-300); }
.btn-white { background:#fff; color:var(--em-700); }
.btn-lg { padding:15px 36px; font-size:16px; }

/* ===== 顶部细条 ===== */
.topbar { background:var(--em-900); color:var(--em-200); font-size:12.5px; }
.topbar .container { display:flex; align-items:center; justify-content:space-between; height:38px; }
.topbar a { color:var(--em-200); }
.topbar a:hover { color:#fff; }
.topbar .tb-links { display:flex; gap:18px; }

/* ===== Header / 导航 ===== */
.site-header {
  background:rgba(255,255,255,.92); backdrop-filter:blur(10px);
  position:sticky; top:0; z-index:9998; border-bottom:1px solid var(--ink-200);
}
.header-inner { display:flex; align-items:center; justify-content:space-between; height:70px; gap:18px; }
.brand { display:flex; align-items:center; gap:10px; flex-shrink:0; }
.brand img { width:38px; height:38px; }
.brand-name { font-size:20px; font-weight:800; color:var(--ink-900); letter-spacing:.5px; }
.brand-name em { color:var(--em-600); font-style:normal; }

.main-nav { display:flex; align-items:center; gap:2px; }
.nav-link {
  color:var(--ink-700); padding:9px 11px; font-size:13.5px; font-weight:600;
  display:inline-flex; align-items:center; white-space:nowrap; border-radius:var(--radius-sm);
}
.nav-link:hover, .nav-link.active { color:var(--em-700); background:var(--em-50); }
.caret { font-size:10px; margin-left:3px; }
.nav-dropdown { position:relative; }
.dropdown-menu {
  position:absolute; top:calc(100% + 6px); left:0; min-width:208px;
  background:#fff; border:1px solid var(--ink-200); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:8px;
  opacity:0; visibility:hidden; transform:translateY(8px);
  transition:all .18s ease; z-index:99999;
}
.nav-dropdown:hover .dropdown-menu { opacity:1; visibility:visible; transform:translateY(0); }
.dropdown-menu a {
  display:block; padding:9px 12px; font-size:13.5px; color:var(--ink-700);
  border-radius:var(--radius-sm);
}
.dropdown-menu a:hover { background:var(--em-50); color:var(--em-700); }
.nav-cta .btn { padding:10px 22px; }

/* 移动端汉堡控制 */
.nav-toggle { display:none; background:none; border:none; font-size:26px; color:var(--ink-900); }
#navSwitch { display:none; }

/* ===== 面包屑 ===== */
.crumb { padding:16px 0; font-size:13px; color:var(--ink-500); }
.crumb .container { display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.crumb a { color:var(--ink-500); }
.crumb a:hover { color:var(--em-700); }
.crumb .sep { color:var(--ink-300); }

/* ===== 通用组件 ===== */
.grid { display:grid; gap:22px; }
.g-2 { grid-template-columns:repeat(2,1fr); }
.g-3 { grid-template-columns:repeat(3,1fr); }
.g-4 { grid-template-columns:repeat(4,1fr); }
.card {
  background:#fff; border:1px solid var(--ink-200); border-radius:var(--radius);
  padding:26px; transition:transform .2s, box-shadow .2s;
}
.card:hover { transform:translateY(-4px); box-shadow:var(--shadow); }
.card .ico { font-size:30px; margin-bottom:14px; }
.card h3 { font-size:17px; margin-bottom:9px; }
.card p { color:var(--ink-500); font-size:14px; }

.badge {
  display:inline-block; font-size:12px; font-weight:700; color:var(--em-700);
  background:var(--em-50); border:1px solid var(--em-200);
  padding:4px 12px; border-radius:var(--radius-pill);
}
.badge.hot { color:#b45309; background:#fffbeb; border-color:#fde68a; }

/* 数据条 */
.stats { display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.stat { text-align:center; background:#fff; border:1px solid var(--ink-200); border-radius:var(--radius); padding:26px 14px; }
.stat b { display:block; font-size:30px; color:var(--em-700); line-height:1.1; }
.stat span { font-size:13px; color:var(--ink-500); margin-top:6px; display:block; }

/* 表格 */
.table-wrap { overflow-x:auto; background:#fff; border:1px solid var(--ink-200); border-radius:var(--radius); }
table.tbl { width:100%; border-collapse:collapse; min-width:560px; }
.tbl th, .tbl td { padding:14px 18px; text-align:left; font-size:14px; border-bottom:1px solid var(--ink-200); }
.tbl thead th { background:var(--em-50); color:var(--em-800); font-weight:700; }
.tbl tbody tr:last-child td { border-bottom:none; }
.tbl tbody tr:hover { background:var(--ink-50); }

/* FAQ 手风琴 */
.faq details {
  background:#fff; border:1px solid var(--ink-200); border-radius:var(--radius);
  padding:0 22px; margin-bottom:12px;
}
.faq summary {
  list-style:none; cursor:pointer; padding:18px 0; font-weight:700; font-size:15px;
  display:flex; justify-content:space-between; align-items:center; gap:12px;
}
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after { content:"+"; font-size:22px; color:var(--em-600); font-weight:400; }
.faq details[open] summary::after { content:"−"; }
.faq details p { color:var(--ink-500); font-size:14px; padding:0 0 18px; }

/* CTA 横幅 */
.cta-band {
  background:linear-gradient(135deg,var(--em-600),var(--em-800));
  border-radius:var(--radius-lg); color:#fff; padding:52px 40px; text-align:center;
}
.cta-band h2 { color:#fff; font-size:26px; }
.cta-band p { color:var(--em-100); margin:12px 0 26px; font-size:15px; }
.cta-band .btns { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }

/* 步骤流程 */
.steps { display:grid; grid-template-columns:repeat(4,1fr); gap:20px; counter-reset:step; }
.step { position:relative; background:#fff; border:1px solid var(--ink-200); border-radius:var(--radius); padding:28px 22px 24px; }
.step::before {
  counter-increment:step; content:counter(step);
  width:38px; height:38px; display:flex; align-items:center; justify-content:center;
  background:var(--em-600); color:#fff; font-weight:800; border-radius:var(--radius-pill); margin-bottom:14px;
}
.step h3 { font-size:16px; margin-bottom:8px; }
.step p { color:var(--ink-500); font-size:13.5px; }

/* ===== 页脚 ===== */
.site-footer { background:var(--em-900); color:var(--em-200); margin-top:20px; }
.footer-grid { display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:34px; padding:58px 0 42px; }
.footer-col .f-title { color:#fff; font-size:15.5px; margin-bottom:18px; font-weight:700; }
.footer-col p { color:var(--em-300); font-size:13.5px; margin-bottom:10px; }
.footer-col a { display:block; color:var(--em-300); font-size:13.5px; padding:5px 0; }
.footer-col a:hover { color:#fff; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.12); padding:20px 0; }
.footer-bottom p { color:var(--em-400); font-size:13px; text-align:center; }
.footer-bottom a { color:var(--em-300); }
.footer-bottom a:hover { color:#fff; }
.legal-links { display:flex; gap:22px; justify-content:center; flex-wrap:wrap; margin-bottom:12px; }
.legal-links a { display:inline-block; }
.legal-links a:hover { color:#fff; }

/* ===== 响应式 ===== */
@media (max-width:1024px) {
  .g-4 { grid-template-columns:repeat(2,1fr); }
  .stats, .steps { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1fr 1fr; }
}
@media (max-width:900px) {
  .nav-toggle { display:block; }
  .main-nav {
    position:fixed; top:70px; left:0; right:0; bottom:0;
    flex-direction:column; align-items:stretch; gap:0;
    background:#fff; padding:14px; overflow-y:auto;
    display:none; z-index:9997;
  }
  #navSwitch:checked ~ .header-inner .main-nav { display:flex; }
  .main-nav .nav-link { padding:13px 14px; font-size:15px; }
  .nav-dropdown .dropdown-menu {
    position:static; opacity:1; visibility:visible; transform:none;
    box-shadow:none; border:1px solid var(--ink-200); margin:4px 0 8px; display:block;
  }
  .nav-cta { margin-top:10px; }
  .nav-cta .btn { width:100%; }
  .g-3, .g-2 { grid-template-columns:1fr; }
  .topbar .tb-links { display:none; }
}
@media (max-width:560px) {
  .g-4, .stats, .steps { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; gap:26px; }
  .section { padding:46px 0; }
  .cta-band { padding:40px 24px; }
}