/* 思维导图教程官网 · 样式 */
:root{--brand:#22D18E;--brand-dark:#12A46F;--brand-soft:#EAF9F2;
--ink:#1F2D28;--ink-2:#4A5A54;--muted:#7D8984;--bg:#F4F7F5;--card:#FFF;--line:#E4EDE8;}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.8;
font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-text-size-adjust:100%}
a{color:var(--brand-dark);text-decoration:none}
a:hover{color:var(--brand)}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;height:64px;gap:22px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink)}
.brand .dot{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#6FE7BE,#12A46F);flex:0 0 auto}
.nav ul{display:flex;gap:20px;margin:0 0 0 auto;padding:0;list-style:none}
.nav ul a{color:var(--ink-2);font-size:15px}
.hero{background:linear-gradient(135deg,#35DDA0 0%,#12A46F 100%);color:#fff;padding:64px 0 58px}
.hero h1{margin:0 0 14px;font-size:34px;line-height:1.35;letter-spacing:.5px}
.hero p{margin:0;font-size:17px;color:rgba(255,255,255,.92);max-width:780px}
.hero .tag{display:inline-block;font-size:12px;letter-spacing:2px;background:rgba(255,255,255,.20);padding:4px 12px;border-radius:12px;margin-bottom:16px}
section{padding:52px 0}
h2{font-size:24px;margin:0 0 8px;color:var(--ink)}
h2 .bar{display:inline-block;width:4px;height:20px;border-radius:2px;background:var(--brand);margin-right:10px;vertical-align:-3px}
.lead{color:var(--muted);margin:0 0 26px}
.card{background:var(--card);border-radius:16px;padding:26px 24px;box-shadow:0 3px 16px rgba(30,70,55,.06)}
.company{display:grid;grid-template-columns:1.4fr 1fr;gap:22px}
.company .name{font-size:22px;font-weight:700;margin:0 0 6px}
.company dl{margin:16px 0 0;display:grid;grid-template-columns:84px 1fr;gap:8px 12px;font-size:15px}
.company dt{color:var(--muted)}
.company dd{margin:0;color:var(--ink-2);word-break:break-all}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.item{background:var(--card);border-radius:14px;padding:20px;box-shadow:0 3px 14px rgba(30,70,55,.05)}
.item .t{font-weight:600;margin:0 0 6px;font-size:16px}
.item .d{color:var(--muted);font-size:14px;margin:0}
.item .ico{width:34px;height:34px;border-radius:10px;background:var(--brand-soft);color:var(--brand-dark);
display:flex;align-items:center;justify-content:center;font-weight:700;margin-bottom:12px}
.app{display:grid;grid-template-columns:1.2fr 1fr;gap:24px;align-items:center}
.app ul{margin:0;padding-left:20px;color:var(--ink-2)}
.app ul li{margin:6px 0}
.btn{display:inline-block;margin-top:18px;background:var(--brand);color:#fff;font-weight:600;padding:12px 26px;border-radius:26px}
.btn:hover{background:var(--brand-dark);color:#fff}
.contact{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.contact .c{background:var(--card);border-radius:14px;padding:20px;box-shadow:0 3px 14px rgba(30,70,55,.05)}
.contact .k{color:var(--muted);font-size:13px;margin:0 0 6px}
.contact .v{margin:0;font-size:15px;color:var(--ink);word-break:break-all}
footer{background:#12211C;color:#9DB3AB;padding:34px 0;margin-top:20px;font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between}
footer a{color:#9DB3AB}footer a:hover{color:#fff}
@media (max-width:820px){.company,.app,.contact{grid-template-columns:1fr}
.grid{grid-template-columns:1fr 1fr}.hero h1{font-size:26px}}
@media (max-width:520px){.grid{grid-template-columns:1fr}.nav .wrap{height:58px;gap:12px}
.brand{font-size:15px}.nav ul{gap:14px}.nav ul a{font-size:14px}section{padding:38px 0}}