:root {
  --bg: #0f1419;
  --bg-card: #1a2029;
  --bg-elev: #232b36;
  --border: #2c3540;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --primary: #4f9eff;
  --primary-hover: #6cb0ff;
  --success: #3fb950;
  --warn: #d29922;
  --danger: #f85149;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.view { display: none; }
.view.active { display: block; }

/* ========== 登录页 ========== */
#view-login {
  min-height: 100vh;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background:
    radial-gradient(at 20% 30%, rgba(79,158,255,0.15), transparent 50%),
    radial-gradient(at 80% 70%, rgba(63,185,80,0.10), transparent 50%);
}
#view-login.active { display: flex; }

.login-card {
  width: 100%;
  max-width: 400px;
  padding: 36px 32px;
}

.brand {
  text-align: center;
  margin-bottom: 28px;
}
.logo {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--primary), #2d6dd0);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
}
.brand h1 {
  font-size: 22px;
  margin-bottom: 4px;
}
.subtitle {
  color: var(--text-dim);
  font-size: 13px;
}

/* ========== 通用 ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}
.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.card-head h2 { font-size: 16px; font-weight: 600; }

.field {
  margin-bottom: 16px;
}
.field label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.field input {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}
.field input:focus {
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--bg-elev);
  color: var(--text);
}
.btn:hover { background: #2c3641; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  width: 100%;
  padding: 12px;
  margin-top: 4px;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-sm { padding: 6px 12px; font-size: 12px; width: auto; }
.btn-sm.btn-primary { padding: 6px 14px; }
.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  padding: 6px 12px;
  font-size: 13px;
}
.btn-ghost:hover { color: var(--text); background: var(--bg-elev); }

.form-msg {
  margin-top: 12px;
  text-align: center;
  font-size: 13px;
  min-height: 18px;
}
.form-msg.error { color: var(--danger); }
.form-msg.success { color: var(--success); }

/* ========== 主面板 ========== */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 28px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}
.brand-mini {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}
.logo-sm {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), #2d6dd0);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}
.user-area {
  display: flex;
  align-items: center;
  gap: 12px;
}
.user-area span { color: var(--text-dim); font-size: 13px; }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.stat {
  background: var(--bg-elev);
  padding: 14px;
  border-radius: 8px;
}
.stat-label {
  display: block;
  color: var(--text-dim);
  font-size: 12px;
  margin-bottom: 4px;
}
.stat-value {
  font-size: 18px;
  font-weight: 600;
}

.progress {
  height: 6px;
  background: var(--bg-elev);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 16px;
}
.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), #6cb0ff);
  transition: width 0.4s;
}

.sub-link {
  display: flex;
  gap: 8px;
}
.sub-link input {
  flex: 1;
  padding: 9px 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 12px;
  font-family: monospace;
}

/* ========== 节点列表 ========== */
.node-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.empty {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  padding: 30px 0;
}
.node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-elev);
  border-radius: 8px;
  border-left: 3px solid var(--border);
  transition: border-color 0.2s;
}
.node-info { display: flex; flex-direction: column; gap: 2px; }
.node-name { font-size: 14px; font-weight: 500; }
.node-meta { font-size: 11px; color: var(--text-dim); }
.node-latency {
  font-family: monospace;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
}
.node.testing { border-left-color: var(--warn); }
.node.testing .node-latency::after {
  content: " ...";
}
.node.fast { border-left-color: var(--success); }
.node.fast .node-latency { color: var(--success); }
.node.medium { border-left-color: var(--warn); }
.node.medium .node-latency { color: var(--warn); }
.node.slow { border-left-color: var(--danger); }
.node.slow .node-latency { color: var(--danger); }
.node.timeout { border-left-color: var(--danger); opacity: 0.7; }
.node.timeout .node-latency { color: var(--danger); }

/* ========== Toast ========== */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  padding: 10px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: all 0.3s;
  z-index: 9999;
  pointer-events: none;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.toast.error { border-color: var(--danger); color: var(--danger); }
.toast.success { border-color: var(--success); color: var(--success); }

@media (max-width: 600px) {
  .topbar { padding: 12px 16px; }
  .container { padding: 16px 12px; }
  .card { padding: 18px; }
  .login-card { padding: 28px 22px; }
}