/* ============================================
   山屿 SHANYU · 全站深色科技风共享样式
   ============================================ */
:root{
  --bg:#05070d;
  --card:rgba(255,255,255,0.035);
  --card-border:rgba(255,255,255,0.08);
  --text:#e8eef7;
  --text-dim:#8b98ad;
  --cyan:#22d3ee;
  --blue:#3b82f6;
  --violet:#8b5cf6;
  --grad:linear-gradient(135deg,#22d3ee 0%,#3b82f6 50%,#8b5cf6 100%);
  --radius:16px;
  --font-mono:'Cascadia Code','JetBrains Mono',Consolas,'Courier New',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);min-height:100vh;
  font-family:-apple-system,'PingFang SC','HarmonyOS Sans SC','Microsoft YaHei',sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
/* ===== 背景层 ===== */
.bg-grid{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    linear-gradient(rgba(34,211,238,0.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,211,238,0.045) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 75%);
}
.bg-glow{position:fixed;inset:0;z-index:-3;pointer-events:none;background:
  radial-gradient(600px 400px at 75% 10%,rgba(59,130,246,0.14),transparent 60%),
  radial-gradient(500px 380px at 15% 25%,rgba(34,211,238,0.10),transparent 60%),
  radial-gradient(700px 500px at 50% 100%,rgba(139,92,246,0.08),transparent 60%);}
#particles{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.55}
/* ===== 导航 ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 clamp(16px,4vw,48px);height:64px;
  background:rgba(5,7,13,0.72);
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--card-border);
}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:2px;color:var(--text);text-decoration:none}
.nav-logo .mark{width:34px;height:34px;border-radius:50%;object-fit:cover;display:block;border:1px solid rgba(255,255,255,0.18);box-shadow:0 0 16px rgba(34,211,238,0.25)}
.nav-logo .en{font-family:var(--font-mono);font-weight:400;font-size:13px;color:var(--text-dim);letter-spacing:3px;margin-left:4px}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links a{color:var(--text-dim);text-decoration:none;padding:8px 15px;border-radius:10px;font-size:13.5px;letter-spacing:1px;transition:all .25s}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,0.06)}
.nav-links a.on{color:var(--cyan)}
.nav-cta{margin-left:10px;padding:8px 18px !important;border-radius:10px;background:var(--grad);color:#04121a !important;font-weight:700;box-shadow:0 0 20px rgba(34,211,238,0.3)}
.nav-cta:hover{filter:brightness(1.15)}
/* ===== 内页头部 ===== */
.page{
  max-width:1120px;margin:0 auto;padding:110px 24px 70px;
}
.page-head{text-align:center;margin-bottom:46px}
.page-tag{font-family:var(--font-mono);font-size:12px;color:var(--cyan);letter-spacing:5px;margin-bottom:14px;display:block}
.page-title{font-size:clamp(28px,4.5vw,42px);font-weight:800;letter-spacing:3px}
.page-title .grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.page-sub{color:var(--text-dim);font-size:14.5px;letter-spacing:1px;margin-top:14px;line-height:1.9}
/* ===== 卡片 ===== */
.card{
  position:relative;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--card-border);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  padding:28px 26px;margin-bottom:18px;overflow:hidden;
}
.card-title{
  font-size:17px;font-weight:700;letter-spacing:1.5px;margin-bottom:20px;
  padding-bottom:12px;border-bottom:1px solid var(--card-border);
  display:flex;align-items:center;gap:10px;
}
.card-title::before{content:'';width:4px;height:18px;border-radius:4px;background:var(--grad)}
/* ===== 表单 ===== */
.form-group{margin-bottom:16px}
label{display:block;font-size:12.5px;font-weight:600;color:var(--text-dim);margin-bottom:7px;letter-spacing:1px}
label .req{color:#f87171}
input,select,textarea{
  width:100%;padding:12px 15px;
  background:rgba(255,255,255,0.04);
  border:1.5px solid var(--card-border);border-radius:12px;
  font-size:15px;color:var(--text);transition:all .3s;font-family:inherit;
  -webkit-appearance:none;appearance:none;
}
input::placeholder,textarea::placeholder{color:#4b5768}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--cyan);
  box-shadow:0 0 0 4px rgba(34,211,238,0.12);background:rgba(34,211,238,0.04);
}
select{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14'%3E%3Cpath fill='%2322d3ee' d='M7 9.5L2 4.5h10z'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;padding-right:38px;
}
select option{background:#0a0f1a;color:var(--text)}
textarea{resize:vertical;min-height:70px;line-height:1.6}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:480px){.row2{grid-template-columns:1fr}}
input[type="date"]::-webkit-calendar-picker-indicator,
input[type="time"]::-webkit-calendar-picker-indicator{filter:invert(.7)}
/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:14px 34px;border-radius:12px;border:none;cursor:pointer;
  font-size:15px;font-weight:700;letter-spacing:1px;font-family:inherit;
  transition:all .25s;text-decoration:none;
}
.btn-primary{background:var(--grad);color:#04121a;box-shadow:0 4px 30px rgba(34,211,238,0.35);width:100%}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 40px rgba(34,211,238,0.5)}
.btn-primary:active{transform:none}
.btn-primary:disabled{opacity:.5;cursor:default;box-shadow:none;transform:none}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--card-border)}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}
/* ===== 消息 ===== */
#msg{padding:12px 16px;border-radius:12px;font-size:13.5px;font-weight:500;margin:0 0 16px;display:none;text-align:center;letter-spacing:.5px}
#msg.show{display:block}
#msg.ok{background:rgba(34,197,94,0.12);color:#4ade80;border:1px solid rgba(34,197,94,0.3)}
#msg.err{background:rgba(248,113,113,0.12);color:#f87171;border:1px solid rgba(248,113,113,0.3)}
/* ===== 亮点网格 ===== */
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.grid-item{
  border-radius:14px;padding:20px 12px;text-align:center;
  background:var(--card);border:1px solid var(--card-border);
  transition:all .3s;
}
.grid-item:hover{border-color:rgba(34,211,238,0.4);transform:translateY(-3px)}
.grid-item .emoji{font-size:28px;display:block}
.grid-item .val{font-size:14px;font-weight:600;margin-top:8px}
.grid-item .label{font-size:11.5px;color:var(--text-dim);margin-top:3px;letter-spacing:1px}
/* ===== 列表项 ===== */
.menu-item{padding:13px 4px;border-bottom:1px solid var(--card-border)}
.menu-item:last-child{border-bottom:none}
.menu-item .cat{font-size:14.5px;font-weight:600;margin-bottom:4px}
.menu-item .desc{font-size:12.5px;color:var(--text-dim);line-height:1.7}
/* ===== 页脚 ===== */
.footer{border-top:1px solid var(--card-border);padding:40px 24px 46px;text-align:center;background:rgba(5,7,13,0.6)}
.footer .f-logo{font-size:16px;font-weight:800;letter-spacing:3px;margin-bottom:14px}
.footer .f-logo .grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.footer .beian{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.footer .beian a{color:var(--text-dim);font-size:12.5px;text-decoration:none;letter-spacing:1px;transition:color .25s}
.footer .beian a:hover{color:var(--cyan)}
.footer .copy{color:#4b5768;font-size:12px;margin-top:12px;font-family:var(--font-mono);letter-spacing:1px}
/* ===== 动画 ===== */
@keyframes rise{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:none}}
.rv{opacity:0;transform:translateY(26px);transition:opacity .7s,transform .7s}
.rv.in{opacity:1;transform:none}
/* ===== 响应式 ===== */
@media(max-width:820px){
  .nav-links a:not(.nav-cta){display:none}
  .page{padding-top:100px}
}