/* ============================================================
   建造防线 · 官网 — 黏土卡通设计系统
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=ZCOOL+KuaiLe&family=Noto+Sans+SC:wght@400;500;700;900&display=swap');

:root{
  /* 场景色 */
  --sky-top:#159fdb;
  --sky-mid:#46bdee;
  --sky-bot:#a7e0f5;
  --grass:#7cc242;
  --grass-dark:#56972a;
  --grass-deep:#3f7a1d;

  /* 材料色 */
  --brick:#f1b740;
  --brick-dark:#d4882c;
  --wood:#a5652f;
  --wood-dark:#6e3f18;
  --wood-deep:#4f2c10;
  --cream:#fff6e0;
  --cream-2:#ffe9bf;

  /* 按钮 */
  --green:#8cc63f;     --green-dk:#5c9418;
  --blue:#46a3e3;      --blue-dk:#2570b4;
  --tan:#caa06a;       --tan-dk:#9a7440;
  --red:#ee5a3c;       --red-dk:#bd3420;
  --gold:#ffce3a;      --gold-dk:#e0a312;

  /* 文字 */
  --ink:#5a3613;
  --ink-soft:#8a6a45;
  --star:#ffd23f;

  --maxw:1180px;
  --r:20px;
  font-size:16px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Sans SC",sans-serif;
  color:var(--ink);
  background:#bfe9f7;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

.kuaile{font-family:"ZCOOL KuaiLe",cursive}

/* ---------- 天空 + 草地 背景层 ---------- */
.scene-sky{
  position:fixed;inset:0;z-index:-3;
  background:linear-gradient(180deg,var(--sky-top) 0%,var(--sky-mid) 42%,var(--sky-bot) 100%);
}
.scene-clouds{position:fixed;inset:0;z-index:-2;pointer-events:none;overflow:hidden}
.cloud{
  position:absolute;background:#fff;border-radius:100px;
  filter:drop-shadow(0 8px 0 rgba(120,190,225,.35));
  opacity:.92;
}
.cloud::before,.cloud::after{content:"";position:absolute;background:#fff;border-radius:50%}
.cloud::before{width:60%;height:160%;left:8%;top:-60%}
.cloud::after{width:45%;height:130%;right:10%;top:-40%}
.c1{width:200px;height:54px;top:8%;left:6%;animation:drift 60s linear infinite}
.c2{width:150px;height:42px;top:18%;right:10%;animation:drift 80s linear infinite}
.c3{width:240px;height:60px;top:40%;left:-6%;animation:drift 100s linear infinite}
@keyframes drift{from{transform:translateX(-10vw)}to{transform:translateX(110vw)}}

/* 远山 */
.scene-hills{position:fixed;left:0;right:0;bottom:0;height:38vh;z-index:-2;pointer-events:none}
.hill{position:absolute;bottom:0;border-radius:50% 50% 0 0/100% 100% 0 0}
.hill.a{width:60vw;height:24vh;left:-10vw;background:#9bd36a;opacity:.65}
.hill.b{width:55vw;height:30vh;right:-8vw;background:#86c453;opacity:.7}
.scene-grass{
  position:fixed;left:0;right:0;bottom:0;height:14vh;z-index:-1;pointer-events:none;
  background:linear-gradient(180deg,var(--grass) 0%,var(--grass-dark) 100%);
  border-radius:46% 54% 0 0/100% 100% 0 0;
  box-shadow:inset 0 6px 0 rgba(255,255,255,.25);
}

@media (prefers-reduced-motion:reduce){
  .cloud{animation:none!important}
}

/* ---------- 通用容器/版心 ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
section{position:relative}

/* ---------- 黏土标题 ---------- */
.title-out{
  font-family:"ZCOOL KuaiLe",cursive;
  color:#fff;line-height:1.1;letter-spacing:.02em;
  text-shadow:
    -3px -3px 0 var(--wood-dark), 3px -3px 0 var(--wood-dark),
    -3px 3px 0 var(--wood-dark), 3px 3px 0 var(--wood-dark),
    0 6px 0 var(--wood-dark), 0 10px 8px rgba(0,0,0,.25);
}
.title-blue{
  color:#eaf7ff;
  text-shadow:
    -3px -3px 0 #1f5f96, 3px -3px 0 #1f5f96,
    -3px 3px 0 #1f5f96, 3px 3px 0 #1f5f96,
    0 6px 0 #1f5f96, 0 10px 8px rgba(0,0,0,.22);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:"ZCOOL KuaiLe",cursive;color:var(--wood-dark);
  background:var(--gold);
  padding:.35em 1.1em;border-radius:999px;
  box-shadow:0 4px 0 var(--gold-dk),0 6px 10px rgba(0,0,0,.18),inset 0 2px 0 rgba(255,255,255,.5);
  font-size:1.05rem;
}
.eyebrow .star{color:var(--wood-dark)}

/* ---------- 黏土按钮 ---------- */
.btn{
  --c:var(--green);--cd:var(--green-dk);
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  font-family:"ZCOOL KuaiLe",cursive;
  color:#fff;font-size:1.25rem;line-height:1;
  padding:.85em 1.7em;border:none;cursor:pointer;
  border-radius:16px;
  background:linear-gradient(180deg,color-mix(in srgb,var(--c) 80%,#fff) 0%,var(--c) 55%,var(--cd) 100%);
  box-shadow:0 6px 0 var(--cd),0 10px 14px rgba(0,0,0,.22),inset 0 2px 0 rgba(255,255,255,.45);
  text-shadow:0 2px 0 rgba(0,0,0,.18);
  transition:transform .08s ease,box-shadow .08s ease;
  position:relative;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 0 var(--cd),0 14px 18px rgba(0,0,0,.24),inset 0 2px 0 rgba(255,255,255,.45)}
.btn:active{transform:translateY(4px);box-shadow:0 2px 0 var(--cd),0 4px 6px rgba(0,0,0,.2),inset 0 2px 0 rgba(255,255,255,.4)}
.btn.lg{font-size:1.7rem;padding:1em 2.2em;border-radius:22px}
.btn.blue{--c:var(--blue);--cd:var(--blue-dk)}
.btn.tan{--c:var(--tan);--cd:var(--tan-dk)}
.btn.red{--c:var(--red);--cd:var(--red-dk)}
.btn.gold{--c:var(--gold);--cd:var(--gold-dk);color:var(--wood-dark);text-shadow:0 1px 0 rgba(255,255,255,.4)}
.btn.ghost{
  background:rgba(255,255,255,.85);color:var(--wood-dark);
  box-shadow:0 5px 0 rgba(110,63,24,.35),inset 0 2px 0 rgba(255,255,255,.7);text-shadow:none;
}
.btn.ghost:hover{transform:translateY(-2px)}

/* ---------- 木牌 / 黏土面板 ---------- */
.panel{
  background:var(--cream);
  border-radius:var(--r);
  padding:28px;
  border:3px solid rgba(110,63,24,.18);
  box-shadow:0 10px 0 rgba(110,63,24,.12),0 18px 30px rgba(40,90,120,.18),inset 0 3px 0 rgba(255,255,255,.7);
}
.wood-frame{
  background:linear-gradient(180deg,var(--wood) 0%,var(--wood-dark) 100%);
  border-radius:24px;padding:14px;
  box-shadow:0 10px 0 var(--wood-deep),0 18px 30px rgba(0,0,0,.25),inset 0 2px 0 rgba(255,255,255,.25);
}
.wood-frame .inner{
  background:repeating-linear-gradient(180deg,#c98a4a 0 18px,#c2823f 18px 20px);
  border-radius:14px;padding:22px 24px;color:#fff4df;
  box-shadow:inset 0 0 0 3px rgba(78,44,16,.4),inset 0 4px 10px rgba(78,44,16,.35);
}

/* card */
.card{
  background:var(--cream);border-radius:var(--r);padding:22px;
  border:3px solid rgba(110,63,24,.14);
  box-shadow:0 8px 0 rgba(110,63,24,.12),0 14px 22px rgba(40,90,120,.16),inset 0 2px 0 rgba(255,255,255,.7);
  transition:transform .12s ease,box-shadow .12s ease;
}
.card.hover:hover{transform:translateY(-4px);box-shadow:0 12px 0 rgba(110,63,24,.12),0 20px 30px rgba(40,90,120,.2),inset 0 2px 0 rgba(255,255,255,.7)}

/* 圆形图标底座 */
.ico{
  width:64px;height:64px;border-radius:18px;display:grid;place-items:center;
  font-size:32px;flex:none;
  box-shadow:0 5px 0 rgba(0,0,0,.18),inset 0 2px 0 rgba(255,255,255,.5);
}

/* ---------- 顶部导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  padding:12px 0;
}
.nav-inner{
  display:flex;align-items:center;gap:18px;
  background:linear-gradient(180deg,#fff6e0,#ffe9bf);
  border-radius:18px;padding:10px 16px;
  border:3px solid rgba(110,63,24,.18);
  box-shadow:0 6px 0 rgba(110,63,24,.14),0 12px 22px rgba(40,90,120,.2),inset 0 2px 0 rgba(255,255,255,.7);
}
.brand{display:flex;align-items:center;gap:10px;font-family:"ZCOOL KuaiLe",cursive;font-size:1.4rem;color:var(--wood-dark)}
.brand .logo{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:22px;
  background:linear-gradient(180deg,#5fb4e8,#2f7fc4);
  box-shadow:0 4px 0 #205a90,inset 0 2px 0 rgba(255,255,255,.4);color:#fff;
}
.nav-links{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav-links a{
  font-family:"ZCOOL KuaiLe",cursive;font-size:1.05rem;color:var(--wood-dark);
  padding:.4em .9em;border-radius:12px;transition:background .12s,color .12s;white-space:nowrap;
}
.brand{white-space:nowrap}
.nav-links a:hover{background:rgba(140,198,63,.25)}
.nav-links a.active{background:var(--green);color:#fff;box-shadow:0 3px 0 var(--green-dk),inset 0 1px 0 rgba(255,255,255,.4)}
.nav .btn{font-size:1.05rem;padding:.55em 1.1em}
.nav-links>.lang-switch{margin-left:18px}
.nav-links>.btn{margin-left:8px}
.nav-toggle{display:none}

/* ---------- 页脚 ---------- */
.foot{margin-top:80px;position:relative;z-index:1}
.foot-inner{
  background:linear-gradient(180deg,var(--wood) 0%,var(--wood-dark) 100%);
  border-radius:26px 26px 0 0;padding:40px 32px;color:#ffe9c8;
  box-shadow:inset 0 3px 0 rgba(255,255,255,.18);
}
.foot a{color:#ffe9c8;opacity:.9}
.foot a:hover{opacity:1;text-decoration:underline}
.foot-grid{display:flex;flex-wrap:wrap;gap:40px;justify-content:space-between;max-width:var(--maxw);margin:0 auto}
.foot h4{font-family:"ZCOOL KuaiLe",cursive;color:#ffd23f;font-size:1.2rem;margin-bottom:10px}
.foot-col{display:flex;flex-direction:column;gap:7px}
.foot-bottom{
  max-width:var(--maxw);margin:26px auto 0;padding-top:18px;
  border-top:2px dashed rgba(255,255,255,.22);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;
  font-size:.85rem;color:#f3d3a8;
}

/* ---------- 杂项 ---------- */
.section-head{text-align:center;margin-bottom:40px}
.section-head h2{font-size:clamp(2rem,4.4vw,3.2rem);margin:.4em 0 .2em}
.section-head p{color:var(--ink-soft);max-width:620px;margin:0 auto;font-size:1.08rem}
.pill{
  display:inline-block;background:#fff;border-radius:999px;padding:.25em .8em;
  font-size:.8rem;font-weight:700;color:var(--wood-dark);
  box-shadow:0 2px 0 rgba(110,63,24,.18);
}
.warnbar{
  background:repeating-linear-gradient(45deg,#ffce3a 0 22px,#3a3a3a 22px 44px);
  height:14px;border-radius:8px;box-shadow:inset 0 0 0 2px rgba(0,0,0,.15);
}

/* ---------- 语言切换 ---------- */
.lang-switch{position:relative}
.lang-btn{
  font-family:"ZCOOL KuaiLe",cursive;font-size:1.02rem;color:var(--wood-dark);cursor:pointer;
  background:#fff;border:2px solid rgba(110,63,24,.2);border-radius:12px;padding:.35em .8em;
  display:inline-flex;align-items:center;gap:.35em;white-space:nowrap;
  box-shadow:0 3px 0 rgba(110,63,24,.2),inset 0 1px 0 rgba(255,255,255,.7);
}
.lang-btn:hover{background:#fff6e0}
.lang-menu{
  position:absolute;right:0;top:calc(100% + 8px);min-width:140px;z-index:60;
  background:var(--cream);border-radius:14px;padding:6px;display:none;
  border:3px solid rgba(110,63,24,.18);
  box-shadow:0 8px 0 rgba(110,63,24,.14),0 14px 24px rgba(40,90,120,.28),inset 0 2px 0 rgba(255,255,255,.7);
}
.lang-switch.open .lang-menu{display:block}
.lang-menu a{
  display:block;padding:.5em .8em;border-radius:9px;cursor:pointer;font-weight:700;
  color:var(--wood-dark);font-size:.96rem;white-space:nowrap;
}
.lang-menu a:hover{background:rgba(140,198,63,.25)}
.lang-menu a.on{background:var(--green);color:#fff;box-shadow:0 2px 0 var(--green-dk)}
@media(max-width:860px){.lang-menu{left:0;right:auto}}

/* 内容页排版 */
.doc h2{font-family:"ZCOOL KuaiLe",cursive;color:var(--wood-dark);font-size:1.7rem;margin:30px 0 12px}
.doc h3{font-weight:900;color:var(--ink);font-size:1.18rem;margin:22px 0 8px}
.doc p,.doc li{color:#5f4527;font-size:1rem}
.doc ul,.doc ol{padding-left:1.3em;margin:8px 0}
.doc li{margin:5px 0}
.doc strong{color:var(--wood-dark)}
.toc{position:sticky;top:90px}
.toc a{display:block;padding:.4em .7em;border-radius:10px;color:var(--ink-soft);font-size:.95rem}
.toc a:hover,.toc a.active{background:rgba(140,198,63,.22);color:var(--wood-dark)}

@media(max-width:860px){
  .nav-links{display:none;width:100%;flex-direction:column;margin:8px 0 0}
  .nav-links.open{display:flex}
  .nav-links>.lang-switch,.nav-links>.btn{margin-left:0}
  .nav-toggle{display:grid;margin-left:auto}
  .nav-inner{flex-wrap:wrap}
}