/* 公共主题（深色高级） */
:root{
  --bg0:#070a12;
  --bg1:#0b1224;

  --card:rgba(255,255,255,0.06);
  --card2:rgba(15,23,42,0.55);
  --border:rgba(148,163,184,0.18);

  --text:#e5e7eb;
  --muted:#94a3b8;
  --muted2:#64748b;

  --primary:#3b82f6;
  --primary2:#2563eb;
  --success:#22c55e;
  --success2:#16a34a;
  --danger:#ef4444;
  --danger2:#dc2626;

  --shadow:0 18px 60px rgba(0,0,0,0.45);
  --radius:16px;
}

*{ box-sizing:border-box; }

html, body{
  height: 100%;
}

body{
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1000px 600px at 20% -10%, rgba(59,130,246,0.20), transparent 60%),
    radial-gradient(900px 540px at 110% 20%, rgba(34,197,94,0.10), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

/* 通用卡片与按钮（供各页面复用） */
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06) inset, var(--shadow);
}

.btn{
  border-radius: 12px;
  border: 1px solid rgba(148,163,184,0.22);
  background: var(--card2);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.18s, background 0.18s, border-color 0.18s, box-shadow 0.18s, filter 0.18s;
}
.btn:hover{
  transform: translateY(-1px);
  background: rgba(15,23,42,0.72);
  border-color: rgba(96,165,250,0.30);
}
.btn:disabled{
  opacity: 0.55;
  cursor: not-allowed;
  transform: none !important;
}
.btn:focus-visible{
  outline: none;
  box-shadow: 0 0 0 4px rgba(59,130,246,0.18);
}
.btn-primary{
  background: linear-gradient(135deg, rgba(59,130,246,0.95), rgba(37,99,235,0.95));
  border-color: rgba(59,130,246,0.38);
  color: #fff;
}
.btn-primary:hover{
  filter: brightness(1.03);
  border-color: rgba(59,130,246,0.55);
}
.btn-danger{
  background: linear-gradient(135deg, rgba(239,68,68,0.95), rgba(220,38,38,0.95));
  border-color: rgba(239,68,68,0.35);
  color:#fff;
}
.btn-danger:hover{
  filter: brightness(1.03);
  border-color: rgba(239,68,68,0.55);
}

/* 通用表单控件（尽量不强绑定具体结构） */
input[type="text"], input[type="password"], input[type="number"], textarea, select{
  color: var(--text);
  background: rgba(15,23,42,0.70);
  border: 1px solid rgba(148,163,184,0.22);
}
input[type="text"]:focus, input[type="password"]:focus, input[type="number"]:focus, textarea:focus, select:focus{
  outline: none;
  border-color: rgba(59,130,246,0.65);
  box-shadow: 0 0 0 4px rgba(59,130,246,0.18);
}

@media (max-width: 600px){
  /* 触摸设备减少 hover 位移带来的“跳动感” */
  .btn:hover{ transform: none; }
}