:root {
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-container: #eff6ff;
  --primary-dark: #1d4ed8;

  --success: #10b981;
  --success-container: #ecfdf5;
  --warning: #f59e0b;
  --warning-container: #fffbeb;
  --danger: #ef4444;
  --danger-container: #fef2f2;

  --vip-gold: #d97706;
  --vip-container: #fef3c7;

  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-alt: #f1f5f9;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --border: #e2e8f0;
  --border-focus: #93c5fd;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.brand-title span {
  color: var(--primary);
  font-weight: 600;
}

.brand-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.header-user-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-alt);
  padding: 6px 12px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  border: 1px solid var(--border);
}

.user-avatar {
  font-size: 1rem;
}

/* Fullscreen Login Page */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  background: radial-gradient(circle at 50% 20%, #eff6ff 0%, #f8fafc 80%);
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  max-width: 420px;
  width: 100%;
  padding: 36px 32px;
  box-shadow: var(--shadow-lg);
  animation: modalFadeIn 0.3s ease-out;
}

.login-header {
  text-align: center;
  margin-bottom: 26px;
}

.login-icon {
  margin: 0 auto 14px;
  width: 52px;
  height: 52px;
}

.login-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.login-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.password-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.password-input-wrap input {
  width: 100%;
  padding-right: 44px;
}

.btn-toggle-pwd {
  position: absolute;
  right: 10px;
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-muted);
}

.btn-block {
  width: 100%;
  justify-content: center;
  margin-top: 20px;
  padding: 12px;
  font-size: 0.95rem;
}

.login-hint {
  margin-top: 20px;
  padding: 10px;
  background: var(--surface-alt);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  text-align: center;
  color: var(--text-muted);
}

.login-hint code {
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-container);
  padding: 2px 6px;
  border-radius: 4px;
}

.alert-error {
  background: var(--danger-container);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 14px;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--success-container);
  padding: 6px 14px;
  border-radius: 9999px;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.status-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--success);
}

/* Main Container */
.main-container {
  max-width: 1200px;
  margin: 28px auto;
  padding: 0 24px 60px;
}

/* Quick Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.icon-blue { background: var(--primary-container); }
.icon-green { background: var(--success-container); }
.icon-gold { background: var(--vip-container); }
.icon-indigo { background: #e0e7ff; }

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
}

.tab-btn {
  background: transparent;
  border: none;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--primary);
  background: var(--surface-alt);
}

.tab-btn.active {
  color: var(--primary);
  background: var(--primary-container);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.25s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Toolbar */
.section-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  gap: 10px;
  width: 320px;
  max-width: 100%;
}

.search-box input {
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 0.9rem;
  width: 100%;
  color: var(--text-main);
}

.toolbar-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--surface-alt);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-danger {
  background: var(--danger-container);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background: #fee2e2;
}

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.config-card {
  padding: 28px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.divider {
  height: 1px;
  background: var(--border);
  margin: 28px 0;
}

/* Table */
.table-card {
  overflow: hidden;
}

.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background: var(--surface-alt);
  padding: 14px 18px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tr:hover td {
  background: var(--primary-container);
}

.server-loc {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.server-flag {
  font-size: 1.4rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
}

.badge-vip {
  background: var(--vip-container);
  color: var(--vip-gold);
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.badge-free {
  background: var(--success-container);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.ping-pill {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.ping-good { background: var(--success-container); color: var(--success); }
.ping-med { background: var(--warning-container); color: var(--warning); }
.ping-slow { background: var(--danger-container); color: var(--danger); }

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
}

.form-group input,
.form-group select,
.form-group textarea {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--text-main);
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.card-actions {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
}

/* Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #cbd5e1;
  transition: .3s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary);
}

input:checked + .slider:before {
  transform: translateX(22px);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
}

.modal-overlay.open {
  display: flex;
  animation: modalFadeIn 0.2s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-dialog {
  background: var(--surface);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 800;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-footer {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 300;
}

.toast {
  background: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideToast 0.3s ease-out;
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }

@keyframes slideToast {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}