/* ============ 音乐合奏房间 全局样式 ============ */
:root {
  --bg: #0f1117;
  --bg-2: #181b24;
  --bg-3: #20242f;
  --panel: #1e2230;
  --primary: #7c5cff;
  --primary-2: #5b3fd6;
  --accent: #00e0a4;
  --danger: #ff4d6d;
  --text: #e8eaf2;
  --text-dim: #9aa0b5;
  --border: #2c3142;
  --radius: 12px;
  --shadow: 0 8px 30px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: radial-gradient(1200px 800px at 20% -10%, #23203a 0%, var(--bg) 55%);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 顶部导航 ===== */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  background: rgba(15, 17, 23, .7);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.topbar .brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700;
}
.topbar .brand .logo { font-size: 24px; }
.topbar .actions { display: flex; gap: 10px; align-items: center; }

/* ===== 卡片 / 面板 ===== */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-3);
  color: var(--text);
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: all .15s ease;
  user-select: none;
}
.btn:hover { transform: translateY(-1px); border-color: var(--primary); }
.btn:active { transform: translateY(0); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); border-color: transparent; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-accent { background: linear-gradient(135deg, var(--accent), #00b88a); border-color: transparent; color: #062; }
.btn-danger { background: var(--danger); border-color: transparent; }
.btn-ghost { background: transparent; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-sm { padding: 6px 12px; font-size: 12px; }

/* ===== 输入 ===== */
.input, select.input {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .15s;
}
.input:focus { border-color: var(--primary); }
label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.field { margin-bottom: 16px; }

/* ===== 容器 ===== */
.center-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.maxw { max-width: 1100px; margin: 0 auto; padding: 24px; }
.maxw-sm { max-width: 420px; margin: 0 auto; }

/* ===== 提示 / Toast ===== */
.toast {
  position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
  background: var(--bg-3); border: 1px solid var(--border);
  padding: 12px 20px; border-radius: 8px; box-shadow: var(--shadow);
  z-index: 1000; font-size: 14px;
}
.toast.error { border-color: var(--danger); color: #ffd0d8; }
.toast.ok { border-color: var(--accent); color: #c7ffe9; }

/* ===== 工具类 ===== */
.row { display: flex; gap: 12px; }
.col { display: flex; flex-direction: column; gap: 12px; }
.between { justify-content: space-between; }
.center { justify-content: center; align-items: center; }
.wrap { flex-wrap: wrap; }
.grow { flex: 1; }
.muted { color: var(--text-dim); font-size: 13px; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.hidden { display: none !important; }
.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 11px; font-weight: 700;
  background: var(--bg-3); color: var(--text-dim); border: 1px solid var(--border);
}
.badge.green { background: rgba(0,224,164,.15); color: var(--accent); border-color: transparent; }
.badge.purple { background: rgba(124,92,255,.18); color: #b6a4ff; border-color: transparent; }