* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  background: #f4f7fb;
  color: #111827;
}

.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 250px;
  background: #0f172a;
  color: #e5e7eb;
  padding: 24px 18px;
}

.brand {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 28px;
}

.brand span,
.brand a {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: #93c5fd;
  margin-top: 6px;
  text-decoration: none;
}

.brand a:hover {
  text-decoration: underline;
}

.nav a {
  display: block;
  color: #cbd5e1;
  text-decoration: none;
  padding: 12px 14px;
  border-radius: 12px;
  margin-bottom: 8px;
  font-size: 15px;
}

.nav a.active,
.nav a:hover {
  background: #2563eb;
  color: #fff;
}

.main {
  flex: 1;
  padding: 28px;
  min-width: 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.topbar h1 {
  margin: 0;
  font-size: 28px;
}

.topbar p {
  margin: 6px 0 0;
  color: #6b7280;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 999px;
  background: #dcfce7;
  color: #166534;
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap;
}

.dot {
  width: 9px;
  height: 9px;
  background: #16a34a;
  border-radius: 50%;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mt {
  margin-top: 18px;
}

.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
  min-width: 0;
}

.card h2 {
  margin: 0 0 16px;
  font-size: 18px;
}

.metric-title,
.metric-sub {
  color: #6b7280;
  font-size: 14px;
}

.metric-title {
  margin-bottom: 8px;
}

.metric-sub {
  margin-top: 6px;
  font-size: 13px;
}

.metric-value {
  font-size: 26px;
  font-weight: 800;
  word-break: break-word;
}

.metric-value.small {
  font-size: 16px;
}

.progress {
  margin-top: 14px;
  width: 100%;
  height: 10px;
  background: #e5e7eb;
  border-radius: 999px;
  overflow: hidden;
}

.progress span {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.progress.cpu span {
  background: #2563eb;
}

.progress.mem span {
  background: #f59e0b;
}

.progress.disk span {
  background: #16a34a;
}

.traffic-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.traffic-box {
  padding: 16px;
  border-radius: 16px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
}

.traffic-box strong {
  display: block;
  font-size: 13px;
  color: #6b7280;
  margin-bottom: 8px;
}

.traffic-box span {
  font-size: 22px;
  font-weight: 800;
  word-break: break-word;
}

.info-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.info-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 10px;
  font-size: 15px;
}

.info-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.info-list strong {
  color: #374151;
  font-weight: 600;
}

.info-list span {
  color: #111827;
  font-weight: 700;
  text-align: right;
  word-break: break-word;
}

.firewall-port {
  display: inline-flex;
  align-items: center;
  padding: 7px 11px;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-weight: 700;
  font-size: 13px;
  margin: 4px 6px 4px 0;
}

.alert {
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 16px;
  background: #fffbeb;
  color: #92400e;
  border-left: 5px solid #f59e0b;
  font-size: 14px;
  line-height: 1.7;
}

.alert.green {
  background: #ecfdf5;
  color: #065f46;
  border-left-color: #10b981;
}

.alert.red {
  background: #fef2f2;
  color: #991b1b;
  border-left-color: #ef4444;
}

.actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.btn {
  border: 0;
  border-radius: 14px;
  padding: 13px 14px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  background: #2563eb;
  color: #fff;
  text-decoration: none;
  text-align: center;
  display: inline-block;
}

.btn:hover {
  background: #1d4ed8;
}

.btn.gray {
  background: #f1f5f9;
  color: #111827;
}

.btn.gray:hover {
  background: #e2e8f0;
}

.btn.red {
  background: #ef4444;
}

.btn.red:hover {
  background: #dc2626;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 12px;
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  word-break: break-word;
}

.form,
.form-inline {
  display: grid;
  gap: 12px;
}

.form-inline {
  grid-template-columns: 2fr 1fr auto;
  align-items: end;
}

.form input,
.form-inline input,
.form select,
.form-inline select {
  width: 100%;
  padding: 12px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
}

.logbox {
  white-space: pre-wrap;
  word-break: break-word;
  background: #020617;
  color: #e5e7eb;
  padding: 18px;
  border-radius: 16px;
  max-height: 620px;
  overflow: auto;
}

.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: #0f172a;
}

.login-card {
  width: 360px;
  background: white;
  border-radius: 22px;
  padding: 28px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
  display: grid;
  gap: 12px;
}

.login-card h1 {
  margin: 0;
}

.login-card input {
  padding: 12px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
}

.captcha-row {
  display: grid;
  grid-template-columns: 1fr 150px;
  gap: 10px;
  align-items: center;
}

.captcha-row img {
  width: 150px;
  height: 52px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
  background: #f8fafc;
  cursor: pointer;
}

.captcha-row input {
  min-width: 0;
}

.live-dot {
  font-size: 12px;
  color: #16a34a;
  background: #dcfce7;
  padding: 4px 8px;
  border-radius: 999px;
  margin-left: 8px;
}

.link-panel {
  margin-top: 16px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 14px;
}

.link-item {
  margin-bottom: 16px;
}

.link-item textarea {
  width: 100%;
  min-height: 82px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
  padding: 10px;
  word-break: break-all;
}

.qr {
  width: 160px;
  max-width: 100%;
  margin-top: 10px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
}

.update-badge {
  display: inline-flex;
  margin-left: 10px;
  padding: 4px 8px;
  border-radius: 999px;
  background: #fef3c7;
  color: #92400e;
  font-size: 12px;
  font-weight: 800;
}

.update-badge.ok {
  background: #dcfce7;
  color: #166534;
}

.node-name {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.node-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.node-dot.on {
  background: #16a34a;
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.14);
}

.node-dot.off {
  background: #ef4444;
}

.protocol-actions {
  grid-template-columns: 1fr 1fr 2fr;
}

.log-actions {
  grid-template-columns: 1fr 1fr;
  min-width: 280px;
}

.install-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 12px;
}

.install-form input {
  width: 100%;
  padding: 12px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
}

.users-add-form {
  grid-template-columns: 1fr 1fr 1fr auto;
}

.table-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

@media (max-width: 1100px) {
  .grid-4,
  .grid-3,
  .grid-2,
  .traffic-row,
  .actions {
    grid-template-columns: 1fr 1fr;
  }

  .form-inline {
    grid-template-columns: 1fr;
  }

  .protocol-actions,
  .install-form,
  .users-add-form {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .app {
    display: block;
  }

  .sidebar {
    width: 100%;
  }

  .main {
    padding: 18px;
  }

  .grid-4,
  .grid-3,
  .grid-2,
  .traffic-row,
  .actions,
  .protocol-actions,
  .install-form,
  .users-add-form,
  .log-actions {
    grid-template-columns: 1fr;
  }

  .topbar {
    display: block;
  }

  .status-pill {
    margin-top: 14px;
  }

  .table-actions {
    display: grid;
  }
}

@media (max-width: 420px) {
  .login-card {
    width: calc(100vw - 32px);
  }

  .captcha-row {
    grid-template-columns: 1fr;
  }

  .captcha-row img {
    width: 100%;
    object-fit: contain;
  }
}