:root {
  --bg-main: #090d16;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(24, 33, 53, 0.9);
  --bg-input: rgba(15, 23, 42, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #6366f1;
  
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.25);
  
  --emerald: #10b981;
  --emerald-bg: rgba(16, 185, 129, 0.12);
  --amber: #f59e0b;
  --amber-bg: rgba(245, 158, 11, 0.12);
  --rose: #f43f5e;
  --rose-bg: rgba(244, 63, 94, 0.12);
  --blue: #38bdf8;
  --blue-bg: rgba(56, 189, 248, 0.12);
  --purple: #c084fc;

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dark: #6b7280;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --shadow-glow: 0 0 20px var(--primary-glow);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(192, 132, 252, 0.08) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

code, pre {
  font-family: 'JetBrains Mono', monospace;
}

/* App Container */
.app-container {
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Navbar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 0, 0, 0.25);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.nav-tab:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.nav-tab.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.server-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 8px var(--emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.status-text {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--emerald);
}

/* Main Content */
.main-content {
  flex: 1;
}

.tab-content {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.stat-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.stat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.stat-title {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-muted);
}

.stat-icon {
  font-size: 1.2rem;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 4px;
}

.stat-sub {
  font-size: 0.78rem;
  color: var(--text-dark);
}

.stat-green { color: var(--emerald); }
.stat-yellow { color: var(--amber); }

/* Card & Glass */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
}

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

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.data-table th {
  background: rgba(0, 0, 0, 0.35);
  padding: 12px 16px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  vertical-align: middle;
}

.data-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.key-mono {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(0, 0, 0, 0.3);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.82rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-accent {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-active {
  background: var(--emerald-bg);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-cooldown {
  background: var(--amber-bg);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
  animation: pulse 2s infinite;
}

.badge-invalid {
  background: var(--rose-bg);
  color: var(--rose);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.badge-disabled {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-dark);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.badge-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.78rem;
}

.btn-danger-sm {
  background: rgba(244, 63, 94, 0.15);
  color: var(--rose);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.btn-danger-sm:hover {
  background: var(--rose);
  color: #fff;
}

.btn-full {
  width: 100%;
}

.action-btns {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Forms */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-select option {
  background: #111827;
  color: #fff;
}

.form-range {
  width: 100%;
  accent-color: var(--primary);
}

/* Switch Toggle */
.switch-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(255, 255, 255, 0.15);
  transition: .2s;
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .2s;
  border-radius: 50%;
}

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

input:checked + .slider:before {
  transform: translateX(18px);
}

.switch-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Playground Layout */
.playground-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  align-items: stretch;
}

.playground-chat {
  display: flex;
  flex-direction: column;
  height: 640px;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 14px;
}

.chat-title-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chat-title {
  font-size: 1rem;
  font-weight: 600;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-right: 8px;
}

.message {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  line-height: 1.55;
  max-width: 85%;
  word-break: break-word;
}

.user-msg {
  align-self: flex-end;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #fff;
  border-bottom-right-radius: 2px;
}

.assistant-msg {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-bottom-left-radius: 2px;
  white-space: pre-wrap;
}

.system-msg {
  align-self: center;
  background: rgba(99, 102, 241, 0.08);
  border: 1px dashed rgba(99, 102, 241, 0.3);
  color: var(--primary-light);
  font-size: 0.82rem;
  text-align: center;
  max-width: 90%;
}

.chat-input-area {
  display: flex;
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.chat-textarea {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.9rem;
  resize: none;
  outline: none;
  transition: var(--transition);
}

.chat-textarea:focus {
  border-color: var(--border-focus);
}

/* Documentation Grid */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 20px;
}

.doc-block {
  background: #0d1117;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.doc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
}

.doc-lang {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}

.btn-copy {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy:hover {
  color: #fff;
  border-color: var(--primary);
}

.doc-block pre {
  padding: 14px;
  overflow-x: auto;
  font-size: 0.84rem;
  color: #e6edf3;
  line-height: 1.5;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  width: 100%;
  max-width: 500px;
  animation: modalScale 0.2s ease-out;
}

@keyframes modalScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

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

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

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

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 2000;
}

.toast {
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  animation: slideInRight 0.25s ease-out;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.toast-success { background: #065f46; border-color: #10b981; }
.toast-error { background: #881337; border-color: #f43f5e; }
.toast-info { background: #1e1b4b; border-color: #6366f1; }

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.85rem; }
.py-6 { padding-top: 24px; padding-bottom: 24px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mt-4 { margin-top: 16px; }

/* Responsive */
@media (max-width: 900px) {
  .playground-layout {
    grid-template-columns: 1fr;
  }
  .docs-grid {
    grid-template-columns: 1fr;
  }
  .navbar {
    flex-direction: column;
    gap: 14px;
    align-items: stretch;
  }
  .nav-tabs {
    overflow-x: auto;
  }
}